Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/drivers/mmc/host/atmel-mci.c

  1 /*
  2  * Atmel MultiMedia Card Interface driver
  3  *
  4  * Copyright (C) 2004-2008 Atmel Corporation
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/blkdev.h>
 11 #include <linux/clk.h>
 12 #include <linux/debugfs.h>
 13 #include <linux/device.h>
 14 #include <linux/dmaengine.h>
 15 #include <linux/dma-mapping.h>
 16 #include <linux/err.h>
 17 #include <linux/gpio.h>
 18 #include <linux/init.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/io.h>
 21 #include <linux/ioport.h>
 22 #include <linux/module.h>
 23 #include <linux/of.h>
 24 #include <linux/of_device.h>
 25 #include <linux/of_gpio.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/scatterlist.h>
 28 #include <linux/seq_file.h>
 29 #include <linux/slab.h>
 30 #include <linux/stat.h>
 31 #include <linux/types.h>
 32 
 33 #include <linux/mmc/host.h>
 34 #include <linux/mmc/sdio.h>
 35 
 36 #include <linux/atmel-mci.h>
 37 #include <linux/atmel_pdc.h>
 38 #include <linux/pm.h>
 39 #include <linux/pm_runtime.h>
 40 #include <linux/pinctrl/consumer.h>
 41 
 42 #include <asm/cacheflush.h>
 43 #include <asm/io.h>
 44 #include <asm/unaligned.h>
 45 
 46 /*
 47  * Superset of MCI IP registers integrated in Atmel AVR32 and AT91 Processors
 48  * Registers and bitfields marked with [2] are only available in MCI2
 49  */
 50 
 51 /* MCI Register Definitions */
 52 #define ATMCI_CR                        0x0000  /* Control */
 53 #define         ATMCI_CR_MCIEN                  BIT(0)          /* MCI Enable */
 54 #define         ATMCI_CR_MCIDIS                 BIT(1)          /* MCI Disable */
 55 #define         ATMCI_CR_PWSEN                  BIT(2)          /* Power Save Enable */
 56 #define         ATMCI_CR_PWSDIS                 BIT(3)          /* Power Save Disable */
 57 #define         ATMCI_CR_SWRST                  BIT(7)          /* Software Reset */
 58 #define ATMCI_MR                        0x0004  /* Mode */
 59 #define         ATMCI_MR_CLKDIV(x)              ((x) <<  0)     /* Clock Divider */
 60 #define         ATMCI_MR_PWSDIV(x)              ((x) <<  8)     /* Power Saving Divider */
 61 #define         ATMCI_MR_RDPROOF                BIT(11)         /* Read Proof */
 62 #define         ATMCI_MR_WRPROOF                BIT(12)         /* Write Proof */
 63 #define         ATMCI_MR_PDCFBYTE               BIT(13)         /* Force Byte Transfer */
 64 #define         ATMCI_MR_PDCPADV                BIT(14)         /* Padding Value */
 65 #define         ATMCI_MR_PDCMODE                BIT(15)         /* PDC-oriented Mode */
 66 #define         ATMCI_MR_CLKODD(x)              ((x) << 16)     /* LSB of Clock Divider */
 67 #define ATMCI_DTOR                      0x0008  /* Data Timeout */
 68 #define         ATMCI_DTOCYC(x)                 ((x) <<  0)     /* Data Timeout Cycles */
 69 #define         ATMCI_DTOMUL(x)                 ((x) <<  4)     /* Data Timeout Multiplier */
 70 #define ATMCI_SDCR                      0x000c  /* SD Card / SDIO */
 71 #define         ATMCI_SDCSEL_SLOT_A             (0 <<  0)       /* Select SD slot A */
 72 #define         ATMCI_SDCSEL_SLOT_B             (1 <<  0)       /* Select SD slot A */
 73 #define         ATMCI_SDCSEL_MASK               (3 <<  0)
 74 #define         ATMCI_SDCBUS_1BIT               (0 <<  6)       /* 1-bit data bus */
 75 #define         ATMCI_SDCBUS_4BIT               (2 <<  6)       /* 4-bit data bus */
 76 #define         ATMCI_SDCBUS_8BIT               (3 <<  6)       /* 8-bit data bus[2] */
 77 #define         ATMCI_SDCBUS_MASK               (3 <<  6)
 78 #define ATMCI_ARGR                      0x0010  /* Command Argument */
 79 #define ATMCI_CMDR                      0x0014  /* Command */
 80 #define         ATMCI_CMDR_CMDNB(x)             ((x) <<  0)     /* Command Opcode */
 81 #define         ATMCI_CMDR_RSPTYP_NONE          (0 <<  6)       /* No response */
 82 #define         ATMCI_CMDR_RSPTYP_48BIT         (1 <<  6)       /* 48-bit response */
 83 #define         ATMCI_CMDR_RSPTYP_136BIT        (2 <<  6)       /* 136-bit response */
 84 #define         ATMCI_CMDR_SPCMD_INIT           (1 <<  8)       /* Initialization command */
 85 #define         ATMCI_CMDR_SPCMD_SYNC           (2 <<  8)       /* Synchronized command */
 86 #define         ATMCI_CMDR_SPCMD_INT            (4 <<  8)       /* Interrupt command */
 87 #define         ATMCI_CMDR_SPCMD_INTRESP        (5 <<  8)       /* Interrupt response */
 88 #define         ATMCI_CMDR_OPDCMD               (1 << 11)       /* Open Drain */
 89 #define         ATMCI_CMDR_MAXLAT_5CYC          (0 << 12)       /* Max latency 5 cycles */
 90 #define         ATMCI_CMDR_MAXLAT_64CYC         (1 << 12)       /* Max latency 64 cycles */
 91 #define         ATMCI_CMDR_START_XFER           (1 << 16)       /* Start data transfer */
 92 #define         ATMCI_CMDR_STOP_XFER            (2 << 16)       /* Stop data transfer */
 93 #define         ATMCI_CMDR_TRDIR_WRITE          (0 << 18)       /* Write data */
 94 #define         ATMCI_CMDR_TRDIR_READ           (1 << 18)       /* Read data */
 95 #define         ATMCI_CMDR_BLOCK                (0 << 19)       /* Single-block transfer */
 96 #define         ATMCI_CMDR_MULTI_BLOCK          (1 << 19)       /* Multi-block transfer */
 97 #define         ATMCI_CMDR_STREAM               (2 << 19)       /* MMC Stream transfer */
 98 #define         ATMCI_CMDR_SDIO_BYTE            (4 << 19)       /* SDIO Byte transfer */
 99 #define         ATMCI_CMDR_SDIO_BLOCK           (5 << 19)       /* SDIO Block transfer */
100 #define         ATMCI_CMDR_SDIO_SUSPEND         (1 << 24)       /* SDIO Suspend Command */
101 #define         ATMCI_CMDR_SDIO_RESUME          (2 << 24)       /* SDIO Resume Command */
102 #define ATMCI_BLKR                      0x0018  /* Block */
103 #define         ATMCI_BCNT(x)                   ((x) <<  0)     /* Data Block Count */
104 #define         ATMCI_BLKLEN(x)                 ((x) << 16)     /* Data Block Length */
105 #define ATMCI_CSTOR                     0x001c  /* Completion Signal Timeout[2] */
106 #define         ATMCI_CSTOCYC(x)                ((x) <<  0)     /* CST cycles */
107 #define         ATMCI_CSTOMUL(x)                ((x) <<  4)     /* CST multiplier */
108 #define ATMCI_RSPR                      0x0020  /* Response 0 */
109 #define ATMCI_RSPR1                     0x0024  /* Response 1 */
110 #define ATMCI_RSPR2                     0x0028  /* Response 2 */
111 #define ATMCI_RSPR3                     0x002c  /* Response 3 */
112 #define ATMCI_RDR                       0x0030  /* Receive Data */
113 #define ATMCI_TDR                       0x0034  /* Transmit Data */
114 #define ATMCI_SR                        0x0040  /* Status */
115 #define ATMCI_IER                       0x0044  /* Interrupt Enable */
116 #define ATMCI_IDR                       0x0048  /* Interrupt Disable */
117 #define ATMCI_IMR                       0x004c  /* Interrupt Mask */
118 #define         ATMCI_CMDRDY                    BIT(0)          /* Command Ready */
119 #define         ATMCI_RXRDY                     BIT(1)          /* Receiver Ready */
120 #define         ATMCI_TXRDY                     BIT(2)          /* Transmitter Ready */
121 #define         ATMCI_BLKE                      BIT(3)          /* Data Block Ended */
122 #define         ATMCI_DTIP                      BIT(4)          /* Data Transfer In Progress */
123 #define         ATMCI_NOTBUSY                   BIT(5)          /* Data Not Busy */
124 #define         ATMCI_ENDRX                     BIT(6)          /* End of RX Buffer */
125 #define         ATMCI_ENDTX                     BIT(7)          /* End of TX Buffer */
126 #define         ATMCI_SDIOIRQA                  BIT(8)          /* SDIO IRQ in slot A */
127 #define         ATMCI_SDIOIRQB                  BIT(9)          /* SDIO IRQ in slot B */
128 #define         ATMCI_SDIOWAIT                  BIT(12)         /* SDIO Read Wait Operation Status */
129 #define         ATMCI_CSRCV                     BIT(13)         /* CE-ATA Completion Signal Received */
130 #define         ATMCI_RXBUFF                    BIT(14)         /* RX Buffer Full */
131 #define         ATMCI_TXBUFE                    BIT(15)         /* TX Buffer Empty */
132 #define         ATMCI_RINDE                     BIT(16)         /* Response Index Error */
133 #define         ATMCI_RDIRE                     BIT(17)         /* Response Direction Error */
134 #define         ATMCI_RCRCE                     BIT(18)         /* Response CRC Error */
135 #define         ATMCI_RENDE                     BIT(19)         /* Response End Bit Error */
136 #define         ATMCI_RTOE                      BIT(20)         /* Response Time-Out Error */
137 #define         ATMCI_DCRCE                     BIT(21)         /* Data CRC Error */
138 #define         ATMCI_DTOE                      BIT(22)         /* Data Time-Out Error */
139 #define         ATMCI_CSTOE                     BIT(23)         /* Completion Signal Time-out Error */
140 #define         ATMCI_BLKOVRE                   BIT(24)         /* DMA Block Overrun Error */
141 #define         ATMCI_DMADONE                   BIT(25)         /* DMA Transfer Done */
142 #define         ATMCI_FIFOEMPTY                 BIT(26)         /* FIFO Empty Flag */
143 #define         ATMCI_XFRDONE                   BIT(27)         /* Transfer Done Flag */
144 #define         ATMCI_ACKRCV                    BIT(28)         /* Boot Operation Acknowledge Received */
145 #define         ATMCI_ACKRCVE                   BIT(29)         /* Boot Operation Acknowledge Error */
146 #define         ATMCI_OVRE                      BIT(30)         /* RX Overrun Error */
147 #define         ATMCI_UNRE                      BIT(31)         /* TX Underrun Error */
148 #define ATMCI_DMA                       0x0050  /* DMA Configuration[2] */
149 #define         ATMCI_DMA_OFFSET(x)             ((x) <<  0)     /* DMA Write Buffer Offset */
150 #define         ATMCI_DMA_CHKSIZE(x)            ((x) <<  4)     /* DMA Channel Read and Write Chunk Size */
151 #define         ATMCI_DMAEN                     BIT(8)  /* DMA Hardware Handshaking Enable */
152 #define ATMCI_CFG                       0x0054  /* Configuration[2] */
153 #define         ATMCI_CFG_FIFOMODE_1DATA        BIT(0)          /* MCI Internal FIFO control mode */
154 #define         ATMCI_CFG_FERRCTRL_COR          BIT(4)          /* Flow Error flag reset control mode */
155 #define         ATMCI_CFG_HSMODE                BIT(8)          /* High Speed Mode */
156 #define         ATMCI_CFG_LSYNC                 BIT(12)         /* Synchronize on the last block */
157 #define ATMCI_WPMR                      0x00e4  /* Write Protection Mode[2] */
158 #define         ATMCI_WP_EN                     BIT(0)          /* WP Enable */
159 #define         ATMCI_WP_KEY                    (0x4d4349 << 8) /* WP Key */
160 #define ATMCI_WPSR                      0x00e8  /* Write Protection Status[2] */
161 #define         ATMCI_GET_WP_VS(x)              ((x) & 0x0f)
162 #define         ATMCI_GET_WP_VSRC(x)            (((x) >> 8) & 0xffff)
163 #define ATMCI_VERSION                   0x00FC  /* Version */
164 #define ATMCI_FIFO_APERTURE             0x0200  /* FIFO Aperture[2] */
165 
166 /* This is not including the FIFO Aperture on MCI2 */
167 #define ATMCI_REGS_SIZE         0x100
168 
169 /* Register access macros */
170 #define atmci_readl(port, reg)                          \
171         __raw_readl((port)->regs + reg)
172 #define atmci_writel(port, reg, value)                  \
173         __raw_writel((value), (port)->regs + reg)
174 
175 /* On AVR chips the Peripheral DMA Controller is not connected to MCI. */
176 #ifdef CONFIG_AVR32
177 #       define ATMCI_PDC_CONNECTED      0
178 #else
179 #       define ATMCI_PDC_CONNECTED      1
180 #endif
181 
182 #define AUTOSUSPEND_DELAY       50
183 
184 #define ATMCI_DATA_ERROR_FLAGS  (ATMCI_DCRCE | ATMCI_DTOE | ATMCI_OVRE | ATMCI_UNRE)
185 #define ATMCI_DMA_THRESHOLD     16
186 
187 enum {
188         EVENT_CMD_RDY = 0,
189         EVENT_XFER_COMPLETE,
190         EVENT_NOTBUSY,
191         EVENT_DATA_ERROR,
192 };
193 
194 enum atmel_mci_state {
195         STATE_IDLE = 0,
196         STATE_SENDING_CMD,
197         STATE_DATA_XFER,
198         STATE_WAITING_NOTBUSY,
199         STATE_SENDING_STOP,
200         STATE_END_REQUEST,
201 };
202 
203 enum atmci_xfer_dir {
204         XFER_RECEIVE = 0,
205         XFER_TRANSMIT,
206 };
207 
208 enum atmci_pdc_buf {
209         PDC_FIRST_BUF = 0,
210         PDC_SECOND_BUF,
211 };
212 
213 struct atmel_mci_caps {
214         bool    has_dma_conf_reg;
215         bool    has_pdc;
216         bool    has_cfg_reg;
217         bool    has_cstor_reg;
218         bool    has_highspeed;
219         bool    has_rwproof;
220         bool    has_odd_clk_div;
221         bool    has_bad_data_ordering;
222         bool    need_reset_after_xfer;
223         bool    need_blksz_mul_4;
224         bool    need_notbusy_for_read_ops;
225 };
226 
227 struct atmel_mci_dma {
228         struct dma_chan                 *chan;
229         struct dma_async_tx_descriptor  *data_desc;
230 };
231 
232 /**
233  * struct atmel_mci - MMC controller state shared between all slots
234  * @lock: Spinlock protecting the queue and associated data.
235  * @regs: Pointer to MMIO registers.
236  * @sg: Scatterlist entry currently being processed by PIO or PDC code.
237  * @pio_offset: Offset into the current scatterlist entry.
238  * @buffer: Buffer used if we don't have the r/w proof capability. We
239  *      don't have the time to switch pdc buffers so we have to use only
240  *      one buffer for the full transaction.
241  * @buf_size: size of the buffer.
242  * @phys_buf_addr: buffer address needed for pdc.
243  * @cur_slot: The slot which is currently using the controller.
244  * @mrq: The request currently being processed on @cur_slot,
245  *      or NULL if the controller is idle.
246  * @cmd: The command currently being sent to the card, or NULL.
247  * @data: The data currently being transferred, or NULL if no data
248  *      transfer is in progress.
249  * @data_size: just data->blocks * data->blksz.
250  * @dma: DMA client state.
251  * @data_chan: DMA channel being used for the current data transfer.
252  * @cmd_status: Snapshot of SR taken upon completion of the current
253  *      command. Only valid when EVENT_CMD_COMPLETE is pending.
254  * @data_status: Snapshot of SR taken upon completion of the current
255  *      data transfer. Only valid when EVENT_DATA_COMPLETE or
256  *      EVENT_DATA_ERROR is pending.
257  * @stop_cmdr: Value to be loaded into CMDR when the stop command is
258  *      to be sent.
259  * @tasklet: Tasklet running the request state machine.
260  * @pending_events: Bitmask of events flagged by the interrupt handler
261  *      to be processed by the tasklet.
262  * @completed_events: Bitmask of events which the state machine has
263  *      processed.
264  * @state: Tasklet state.
265  * @queue: List of slots waiting for access to the controller.
266  * @need_clock_update: Update the clock rate before the next request.
267  * @need_reset: Reset controller before next request.
268  * @timer: Timer to balance the data timeout error flag which cannot rise.
269  * @mode_reg: Value of the MR register.
270  * @cfg_reg: Value of the CFG register.
271  * @bus_hz: The rate of @mck in Hz. This forms the basis for MMC bus
272  *      rate and timeout calculations.
273  * @mapbase: Physical address of the MMIO registers.
274  * @mck: The peripheral bus clock hooked up to the MMC controller.
275  * @pdev: Platform device associated with the MMC controller.
276  * @slot: Slots sharing this MMC controller.
277  * @caps: MCI capabilities depending on MCI version.
278  * @prepare_data: function to setup MCI before data transfer which
279  * depends on MCI capabilities.
280  * @submit_data: function to start data transfer which depends on MCI
281  * capabilities.
282  * @stop_transfer: function to stop data transfer which depends on MCI
283  * capabilities.
284  *
285  * Locking
286  * =======
287  *
288  * @lock is a softirq-safe spinlock protecting @queue as well as
289  * @cur_slot, @mrq and @state. These must always be updated
290  * at the same time while holding @lock.
291  *
292  * @lock also protects mode_reg and need_clock_update since these are
293  * used to synchronize mode register updates with the queue
294  * processing.
295  *
296  * The @mrq field of struct atmel_mci_slot is also protected by @lock,
297  * and must always be written at the same time as the slot is added to
298  * @queue.
299  *
300  * @pending_events and @completed_events are accessed using atomic bit
301  * operations, so they don't need any locking.
302  *
303  * None of the fields touched by the interrupt handler need any
304  * locking. However, ordering is important: Before EVENT_DATA_ERROR or
305  * EVENT_DATA_COMPLETE is set in @pending_events, all data-related
306  * interrupts must be disabled and @data_status updated with a
307  * snapshot of SR. Similarly, before EVENT_CMD_COMPLETE is set, the
308  * CMDRDY interrupt must be disabled and @cmd_status updated with a
309  * snapshot of SR, and before EVENT_XFER_COMPLETE can be set, the
310  * bytes_xfered field of @data must be written. This is ensured by
311  * using barriers.
312  */
313 struct atmel_mci {
314         spinlock_t              lock;
315         void __iomem            *regs;
316 
317         struct scatterlist      *sg;
318         unsigned int            sg_len;
319         unsigned int            pio_offset;
320         unsigned int            *buffer;
321         unsigned int            buf_size;
322         dma_addr_t              buf_phys_addr;
323 
324         struct atmel_mci_slot   *cur_slot;
325         struct mmc_request      *mrq;
326         struct mmc_command      *cmd;
327         struct mmc_data         *data;
328         unsigned int            data_size;
329 
330         struct atmel_mci_dma    dma;
331         struct dma_chan         *data_chan;
332         struct dma_slave_config dma_conf;
333 
334         u32                     cmd_status;
335         u32                     data_status;
336         u32                     stop_cmdr;
337 
338         struct tasklet_struct   tasklet;
339         unsigned long           pending_events;
340         unsigned long           completed_events;
341         enum atmel_mci_state    state;
342         struct list_head        queue;
343 
344         bool                    need_clock_update;
345         bool                    need_reset;
346         struct timer_list       timer;
347         u32                     mode_reg;
348         u32                     cfg_reg;
349         unsigned long           bus_hz;
350         unsigned long           mapbase;
351         struct clk              *mck;
352         struct platform_device  *pdev;
353 
354         struct atmel_mci_slot   *slot[ATMCI_MAX_NR_SLOTS];
355 
356         struct atmel_mci_caps   caps;
357 
358         u32 (*prepare_data)(struct atmel_mci *host, struct mmc_data *data);
359         void (*submit_data)(struct atmel_mci *host, struct mmc_data *data);
360         void (*stop_transfer)(struct atmel_mci *host);
361 };
362 
363 /**
364  * struct atmel_mci_slot - MMC slot state
365  * @mmc: The mmc_host representing this slot.
366  * @host: The MMC controller this slot is using.
367  * @sdc_reg: Value of SDCR to be written before using this slot.
368  * @sdio_irq: SDIO irq mask for this slot.
369  * @mrq: mmc_request currently being processed or waiting to be
370  *      processed, or NULL when the slot is idle.
371  * @queue_node: List node for placing this node in the @queue list of
372  *      &struct atmel_mci.
373  * @clock: Clock rate configured by set_ios(). Protected by host->lock.
374  * @flags: Random state bits associated with the slot.
375  * @detect_pin: GPIO pin used for card detection, or negative if not
376  *      available.
377  * @wp_pin: GPIO pin used for card write protect sending, or negative
378  *      if not available.
379  * @detect_is_active_high: The state of the detect pin when it is active.
380  * @detect_timer: Timer used for debouncing @detect_pin interrupts.
381  */
382 struct atmel_mci_slot {
383         struct mmc_host         *mmc;
384         struct atmel_mci        *host;
385 
386         u32                     sdc_reg;
387         u32                     sdio_irq;
388 
389         struct mmc_request      *mrq;
390         struct list_head        queue_node;
391 
392         unsigned int            clock;
393         unsigned long           flags;
394 #define ATMCI_CARD_PRESENT      0
395 #define ATMCI_CARD_NEED_INIT    1
396 #define ATMCI_SHUTDOWN          2
397 
398         int                     detect_pin;
399         int                     wp_pin;
400         bool                    detect_is_active_high;
401 
402         struct timer_list       detect_timer;
403 };
404 
405 #define atmci_test_and_clear_pending(host, event)               \
406         test_and_clear_bit(event, &host->pending_events)
407 #define atmci_set_completed(host, event)                        \
408         set_bit(event, &host->completed_events)
409 #define atmci_set_pending(host, event)                          \
410         set_bit(event, &host->pending_events)
411 
412 /*
413  * The debugfs stuff below is mostly optimized away when
414  * CONFIG_DEBUG_FS is not set.
415  */
416 static int atmci_req_show(struct seq_file *s, void *v)
417 {
418         struct atmel_mci_slot   *slot = s->private;
419         struct mmc_request      *mrq;
420         struct mmc_command      *cmd;
421         struct mmc_command      *stop;
422         struct mmc_data         *data;
423 
424         /* Make sure we get a consistent snapshot */
425         spin_lock_bh(&slot->host->lock);
426         mrq = slot->mrq;
427 
428         if (mrq) {
429                 cmd = mrq->cmd;
430                 data = mrq->data;
431                 stop = mrq->stop;
432 
433                 if (cmd)
434                         seq_printf(s,
435                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
436                                 cmd->opcode, cmd->arg, cmd->flags,
437                                 cmd->resp[0], cmd->resp[1], cmd->resp[2],
438                                 cmd->resp[3], cmd->error);
439                 if (data)
440                         seq_printf(s, "DATA %u / %u * %u flg %x err %d\n",
441                                 data->bytes_xfered, data->blocks,
442                                 data->blksz, data->flags, data->error);
443                 if (stop)
444                         seq_printf(s,
445                                 "CMD%u(0x%x) flg %x rsp %x %x %x %x err %d\n",
446                                 stop->opcode, stop->arg, stop->flags,
447                                 stop->resp[0], stop->resp[1], stop->resp[2],
448                                 stop->resp[3], stop->error);
449         }
450 
451         spin_unlock_bh(&slot->host->lock);
452 
453         return 0;
454 }
455 
456 static int atmci_req_open(struct inode *inode, struct file *file)
457 {
458         return single_open(file, atmci_req_show, inode->i_private);
459 }
460 
461 static const struct file_operations atmci_req_fops = {
462         .owner          = THIS_MODULE,
463         .open           = atmci_req_open,
464         .read           = seq_read,
465         .llseek         = seq_lseek,
466         .release        = single_release,
467 };
468 
469 static void atmci_show_status_reg(struct seq_file *s,
470                 const char *regname, u32 value)
471 {
472         static const char       *sr_bit[] = {
473                 [0]     = "CMDRDY",
474                 [1]     = "RXRDY",
475                 [2]     = "TXRDY",
476                 [3]     = "BLKE",
477                 [4]     = "DTIP",
478                 [5]     = "NOTBUSY",
479                 [6]     = "ENDRX",
480                 [7]     = "ENDTX",
481                 [8]     = "SDIOIRQA",
482                 [9]     = "SDIOIRQB",
483                 [12]    = "SDIOWAIT",
484                 [14]    = "RXBUFF",
485                 [15]    = "TXBUFE",
486                 [16]    = "RINDE",
487                 [17]    = "RDIRE",
488                 [18]    = "RCRCE",
489                 [19]    = "RENDE",
490                 [20]    = "RTOE",
491                 [21]    = "DCRCE",
492                 [22]    = "DTOE",
493                 [23]    = "CSTOE",
494                 [24]    = "BLKOVRE",
495                 [25]    = "DMADONE",
496                 [26]    = "FIFOEMPTY",
497                 [27]    = "XFRDONE",
498                 [30]    = "OVRE",
499                 [31]    = "UNRE",
500         };
501         unsigned int            i;
502 
503         seq_printf(s, "%s:\t0x%08x", regname, value);
504         for (i = 0; i < ARRAY_SIZE(sr_bit); i++) {
505                 if (value & (1 << i)) {
506                         if (sr_bit[i])
507                                 seq_printf(s, " %s", sr_bit[i]);
508                         else
509                                 seq_puts(s, " UNKNOWN");
510                 }
511         }
512         seq_putc(s, '\n');
513 }
514 
515 static int atmci_regs_show(struct seq_file *s, void *v)
516 {
517         struct atmel_mci        *host = s->private;
518         u32                     *buf;
519         int                     ret = 0;
520 
521 
522         buf = kmalloc(ATMCI_REGS_SIZE, GFP_KERNEL);
523         if (!buf)
524                 return -ENOMEM;
525 
526         pm_runtime_get_sync(&host->pdev->dev);
527 
528         /*
529          * Grab a more or less consistent snapshot. Note that we're
530          * not disabling interrupts, so IMR and SR may not be
531          * consistent.
532          */
533         spin_lock_bh(&host->lock);
534         memcpy_fromio(buf, host->regs, ATMCI_REGS_SIZE);
535         spin_unlock_bh(&host->lock);
536 
537         pm_runtime_mark_last_busy(&host->pdev->dev);
538         pm_runtime_put_autosuspend(&host->pdev->dev);
539 
540         seq_printf(s, "MR:\t0x%08x%s%s ",
541                         buf[ATMCI_MR / 4],
542                         buf[ATMCI_MR / 4] & ATMCI_MR_RDPROOF ? " RDPROOF" : "",
543                         buf[ATMCI_MR / 4] & ATMCI_MR_WRPROOF ? " WRPROOF" : "");
544         if (host->caps.has_odd_clk_div)
545                 seq_printf(s, "{CLKDIV,CLKODD}=%u\n",
546                                 ((buf[ATMCI_MR / 4] & 0xff) << 1)
547                                 | ((buf[ATMCI_MR / 4] >> 16) & 1));
548         else
549                 seq_printf(s, "CLKDIV=%u\n",
550                                 (buf[ATMCI_MR / 4] & 0xff));
551         seq_printf(s, "DTOR:\t0x%08x\n", buf[ATMCI_DTOR / 4]);
552         seq_printf(s, "SDCR:\t0x%08x\n", buf[ATMCI_SDCR / 4]);
553         seq_printf(s, "ARGR:\t0x%08x\n", buf[ATMCI_ARGR / 4]);
554         seq_printf(s, "BLKR:\t0x%08x BCNT=%u BLKLEN=%u\n",
555                         buf[ATMCI_BLKR / 4],
556                         buf[ATMCI_BLKR / 4] & 0xffff,
557                         (buf[ATMCI_BLKR / 4] >> 16) & 0xffff);
558         if (host->caps.has_cstor_reg)
559                 seq_printf(s, "CSTOR:\t0x%08x\n", buf[ATMCI_CSTOR / 4]);
560 
561         /* Don't read RSPR and RDR; it will consume the data there */
562 
563         atmci_show_status_reg(s, "SR", buf[ATMCI_SR / 4]);
564         atmci_show_status_reg(s, "IMR", buf[ATMCI_IMR / 4]);
565 
566         if (host->caps.has_dma_conf_reg) {
567                 u32 val;
568 
569                 val = buf[ATMCI_DMA / 4];
570                 seq_printf(s, "DMA:\t0x%08x OFFSET=%u CHKSIZE=%u%s\n",
571                                 val, val & 3,
572                                 ((val >> 4) & 3) ?
573                                         1 << (((val >> 4) & 3) + 1) : 1,
574                                 val & ATMCI_DMAEN ? " DMAEN" : "");
575         }
576         if (host->caps.has_cfg_reg) {
577                 u32 val;
578 
579                 val = buf[ATMCI_CFG / 4];
580                 seq_printf(s, "CFG:\t0x%08x%s%s%s%s\n",
581                                 val,
582                                 val & ATMCI_CFG_FIFOMODE_1DATA ? " FIFOMODE_ONE_DATA" : "",
583                                 val & ATMCI_CFG_FERRCTRL_COR ? " FERRCTRL_CLEAR_ON_READ" : "",
584                                 val & ATMCI_CFG_HSMODE ? " HSMODE" : "",
585                                 val & ATMCI_CFG_LSYNC ? " LSYNC" : "");
586         }
587 
588         kfree(buf);
589 
590         return ret;
591 }
592 
593 static int atmci_regs_open(struct inode *inode, struct file *file)
594 {
595         return single_open(file, atmci_regs_show, inode->i_private);
596 }
597 
598 static const struct file_operations atmci_regs_fops = {
599         .owner          = THIS_MODULE,
600         .open           = atmci_regs_open,
601         .read           = seq_read,
602         .llseek         = seq_lseek,
603         .release        = single_release,
604 };
605 
606 static void atmci_init_debugfs(struct atmel_mci_slot *slot)
607 {
608         struct mmc_host         *mmc = slot->mmc;
609         struct atmel_mci        *host = slot->host;
610         struct dentry           *root;
611         struct dentry           *node;
612 
613         root = mmc->debugfs_root;
614         if (!root)
615                 return;
616 
617         node = debugfs_create_file("regs", S_IRUSR, root, host,
618                         &atmci_regs_fops);
619         if (IS_ERR(node))
620                 return;
621         if (!node)
622                 goto err;
623 
624         node = debugfs_create_file("req", S_IRUSR, root, slot, &atmci_req_fops);
625         if (!node)
626                 goto err;
627 
628         node = debugfs_create_u32("state", S_IRUSR, root, (u32 *)&host->state);
629         if (!node)
630                 goto err;
631 
632         node = debugfs_create_x32("pending_events", S_IRUSR, root,
633                                      (u32 *)&host->pending_events);
634         if (!node)
635                 goto err;
636 
637         node = debugfs_create_x32("completed_events", S_IRUSR, root,
638                                      (u32 *)&host->completed_events);
639         if (!node)
640                 goto err;
641 
642         return;
643 
644 err:
645         dev_err(&mmc->class_dev, "failed to initialize debugfs for slot\n");
646 }
647 
648 #if defined(CONFIG_OF)
649 static const struct of_device_id atmci_dt_ids[] = {
650         { .compatible = "atmel,hsmci" },
651         { /* sentinel */ }
652 };
653 
654 MODULE_DEVICE_TABLE(of, atmci_dt_ids);
655 
656 static struct mci_platform_data*
657 atmci_of_init(struct platform_device *pdev)
658 {
659         struct device_node *np = pdev->dev.of_node;
660         struct device_node *cnp;
661         struct mci_platform_data *pdata;
662         u32 slot_id;
663 
664         if (!np) {
665                 dev_err(&pdev->dev, "device node not found\n");
666                 return ERR_PTR(-EINVAL);
667         }
668 
669         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
670         if (!pdata) {
671                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
672                 return ERR_PTR(-ENOMEM);
673         }
674 
675         for_each_child_of_node(np, cnp) {
676                 if (of_property_read_u32(cnp, "reg", &slot_id)) {
677                         dev_warn(&pdev->dev, "reg property is missing for %s\n",
678                                  cnp->full_name);
679                         continue;
680                 }
681 
682                 if (slot_id >= ATMCI_MAX_NR_SLOTS) {
683                         dev_warn(&pdev->dev, "can't have more than %d slots\n",
684                                  ATMCI_MAX_NR_SLOTS);
685                         break;
686                 }
687 
688                 if (of_property_read_u32(cnp, "bus-width",
689                                          &pdata->slot[slot_id].bus_width))
690                         pdata->slot[slot_id].bus_width = 1;
691 
692                 pdata->slot[slot_id].detect_pin =
693                         of_get_named_gpio(cnp, "cd-gpios", 0);
694 
695                 pdata->slot[slot_id].detect_is_active_high =
696                         of_property_read_bool(cnp, "cd-inverted");
697 
698                 pdata->slot[slot_id].non_removable =
699                         of_property_read_bool(cnp, "non-removable");
700 
701                 pdata->slot[slot_id].wp_pin =
702                         of_get_named_gpio(cnp, "wp-gpios", 0);
703         }
704 
705         return pdata;
706 }
707 #else /* CONFIG_OF */
708 static inline struct mci_platform_data*
709 atmci_of_init(struct platform_device *dev)
710 {
711         return ERR_PTR(-EINVAL);
712 }
713 #endif
714 
715 static inline unsigned int atmci_get_version(struct atmel_mci *host)
716 {
717         return atmci_readl(host, ATMCI_VERSION) & 0x00000fff;
718 }
719 
720 /*
721  * Fix sconfig's burst size according to atmel MCI. We need to convert them as:
722  * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
723  * With version 0x600, we need to convert them as: 1 -> 0, 2 -> 1, 4 -> 2,
724  * 8 -> 3, 16 -> 4.
725  *
726  * This can be done by finding most significant bit set.
727  */
728 static inline unsigned int atmci_convert_chksize(struct atmel_mci *host,
729                                                  unsigned int maxburst)
730 {
731         unsigned int version = atmci_get_version(host);
732         unsigned int offset = 2;
733 
734         if (version >= 0x600)
735                 offset = 1;
736 
737         if (maxburst > 1)
738                 return fls(maxburst) - offset;
739         else
740                 return 0;
741 }
742 
743 static void atmci_timeout_timer(unsigned long data)
744 {
745         struct atmel_mci *host;
746 
747         host = (struct atmel_mci *)data;
748 
749         dev_dbg(&host->pdev->dev, "software timeout\n");
750 
751         if (host->mrq->cmd->data) {
752                 host->mrq->cmd->data->error = -ETIMEDOUT;
753                 host->data = NULL;
754                 /*
755                  * With some SDIO modules, sometimes DMA transfer hangs. If
756                  * stop_transfer() is not called then the DMA request is not
757                  * removed, following ones are queued and never computed.
758                  */
759                 if (host->state == STATE_DATA_XFER)
760                         host->stop_transfer(host);
761         } else {
762                 host->mrq->cmd->error = -ETIMEDOUT;
763                 host->cmd = NULL;
764         }
765         host->need_reset = 1;
766         host->state = STATE_END_REQUEST;
767         smp_wmb();
768         tasklet_schedule(&host->tasklet);
769 }
770 
771 static inline unsigned int atmci_ns_to_clocks(struct atmel_mci *host,
772                                         unsigned int ns)
773 {
774         /*
775          * It is easier here to use us instead of ns for the timeout,
776          * it prevents from overflows during calculation.
777          */
778         unsigned int us = DIV_ROUND_UP(ns, 1000);
779 
780         /* Maximum clock frequency is host->bus_hz/2 */
781         return us * (DIV_ROUND_UP(host->bus_hz, 2000000));
782 }
783 
784 static void atmci_set_timeout(struct atmel_mci *host,
785                 struct atmel_mci_slot *slot, struct mmc_data *data)
786 {
787         static unsigned dtomul_to_shift[] = {
788                 0, 4, 7, 8, 10, 12, 16, 20
789         };
790         unsigned        timeout;
791         unsigned        dtocyc;
792         unsigned        dtomul;
793 
794         timeout = atmci_ns_to_clocks(host, data->timeout_ns)
795                 + data->timeout_clks;
796 
797         for (dtomul = 0; dtomul < 8; dtomul++) {
798                 unsigned shift = dtomul_to_shift[dtomul];
799                 dtocyc = (timeout + (1 << shift) - 1) >> shift;
800                 if (dtocyc < 15)
801                         break;
802         }
803 
804         if (dtomul >= 8) {
805                 dtomul = 7;
806                 dtocyc = 15;
807         }
808 
809         dev_vdbg(&slot->mmc->class_dev, "setting timeout to %u cycles\n",
810                         dtocyc << dtomul_to_shift[dtomul]);
811         atmci_writel(host, ATMCI_DTOR, (ATMCI_DTOMUL(dtomul) | ATMCI_DTOCYC(dtocyc)));
812 }
813 
814 /*
815  * Return mask with command flags to be enabled for this command.
816  */
817 static u32 atmci_prepare_command(struct mmc_host *mmc,
818                                  struct mmc_command *cmd)
819 {
820         struct mmc_data *data;
821         u32             cmdr;
822 
823         cmd->error = -EINPROGRESS;
824 
825         cmdr = ATMCI_CMDR_CMDNB(cmd->opcode);
826 
827         if (cmd->flags & MMC_RSP_PRESENT) {
828                 if (cmd->flags & MMC_RSP_136)
829                         cmdr |= ATMCI_CMDR_RSPTYP_136BIT;
830                 else
831                         cmdr |= ATMCI_CMDR_RSPTYP_48BIT;
832         }
833 
834         /*
835          * This should really be MAXLAT_5 for CMD2 and ACMD41, but
836          * it's too difficult to determine whether this is an ACMD or
837          * not. Better make it 64.
838          */
839         cmdr |= ATMCI_CMDR_MAXLAT_64CYC;
840 
841         if (mmc->ios.bus_mode == MMC_BUSMODE_OPENDRAIN)
842                 cmdr |= ATMCI_CMDR_OPDCMD;
843 
844         data = cmd->data;
845         if (data) {
846                 cmdr |= ATMCI_CMDR_START_XFER;
847 
848                 if (cmd->opcode == SD_IO_RW_EXTENDED) {
849                         cmdr |= ATMCI_CMDR_SDIO_BLOCK;
850                 } else {
851                         if (data->blocks > 1)
852                                 cmdr |= ATMCI_CMDR_MULTI_BLOCK;
853                         else
854                                 cmdr |= ATMCI_CMDR_BLOCK;
855                 }
856 
857                 if (data->flags & MMC_DATA_READ)
858                         cmdr |= ATMCI_CMDR_TRDIR_READ;
859         }
860 
861         return cmdr;
862 }
863 
864 static void atmci_send_command(struct atmel_mci *host,
865                 struct mmc_command *cmd, u32 cmd_flags)
866 {
867         WARN_ON(host->cmd);
868         host->cmd = cmd;
869 
870         dev_vdbg(&host->pdev->dev,
871                         "start command: ARGR=0x%08x CMDR=0x%08x\n",
872                         cmd->arg, cmd_flags);
873 
874         atmci_writel(host, ATMCI_ARGR, cmd->arg);
875         atmci_writel(host, ATMCI_CMDR, cmd_flags);
876 }
877 
878 static void atmci_send_stop_cmd(struct atmel_mci *host, struct mmc_data *data)
879 {
880         dev_dbg(&host->pdev->dev, "send stop command\n");
881         atmci_send_command(host, data->stop, host->stop_cmdr);
882         atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
883 }
884 
885 /*
886  * Configure given PDC buffer taking care of alignement issues.
887  * Update host->data_size and host->sg.
888  */
889 static void atmci_pdc_set_single_buf(struct atmel_mci *host,
890         enum atmci_xfer_dir dir, enum atmci_pdc_buf buf_nb)
891 {
892         u32 pointer_reg, counter_reg;
893         unsigned int buf_size;
894 
895         if (dir == XFER_RECEIVE) {
896                 pointer_reg = ATMEL_PDC_RPR;
897                 counter_reg = ATMEL_PDC_RCR;
898         } else {
899                 pointer_reg = ATMEL_PDC_TPR;
900                 counter_reg = ATMEL_PDC_TCR;
901         }
902 
903         if (buf_nb == PDC_SECOND_BUF) {
904                 pointer_reg += ATMEL_PDC_SCND_BUF_OFF;
905                 counter_reg += ATMEL_PDC_SCND_BUF_OFF;
906         }
907 
908         if (!host->caps.has_rwproof) {
909                 buf_size = host->buf_size;
910                 atmci_writel(host, pointer_reg, host->buf_phys_addr);
911         } else {
912                 buf_size = sg_dma_len(host->sg);
913                 atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
914         }
915 
916         if (host->data_size <= buf_size) {
917                 if (host->data_size & 0x3) {
918                         /* If size is different from modulo 4, transfer bytes */
919                         atmci_writel(host, counter_reg, host->data_size);
920                         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCFBYTE);
921                 } else {
922                         /* Else transfer 32-bits words */
923                         atmci_writel(host, counter_reg, host->data_size / 4);
924                 }
925                 host->data_size = 0;
926         } else {
927                 /* We assume the size of a page is 32-bits aligned */
928                 atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
929                 host->data_size -= sg_dma_len(host->sg);
930                 if (host->data_size)
931                         host->sg = sg_next(host->sg);
932         }
933 }
934 
935 /*
936  * Configure PDC buffer according to the data size ie configuring one or two
937  * buffers. Don't use this function if you want to configure only the second
938  * buffer. In this case, use atmci_pdc_set_single_buf.
939  */
940 static void atmci_pdc_set_both_buf(struct atmel_mci *host, int dir)
941 {
942         atmci_pdc_set_single_buf(host, dir, PDC_FIRST_BUF);
943         if (host->data_size)
944                 atmci_pdc_set_single_buf(host, dir, PDC_SECOND_BUF);
945 }
946 
947 /*
948  * Unmap sg lists, called when transfer is finished.
949  */
950 static void atmci_pdc_cleanup(struct atmel_mci *host)
951 {
952         struct mmc_data         *data = host->data;
953 
954         if (data)
955                 dma_unmap_sg(&host->pdev->dev,
956                                 data->sg, data->sg_len,
957                                 ((data->flags & MMC_DATA_WRITE)
958                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
959 }
960 
961 /*
962  * Disable PDC transfers. Update pending flags to EVENT_XFER_COMPLETE after
963  * having received ATMCI_TXBUFE or ATMCI_RXBUFF interrupt. Enable ATMCI_NOTBUSY
964  * interrupt needed for both transfer directions.
965  */
966 static void atmci_pdc_complete(struct atmel_mci *host)
967 {
968         int transfer_size = host->data->blocks * host->data->blksz;
969         int i;
970 
971         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
972 
973         if ((!host->caps.has_rwproof)
974             && (host->data->flags & MMC_DATA_READ)) {
975                 if (host->caps.has_bad_data_ordering)
976                         for (i = 0; i < transfer_size; i++)
977                                 host->buffer[i] = swab32(host->buffer[i]);
978                 sg_copy_from_buffer(host->data->sg, host->data->sg_len,
979                                     host->buffer, transfer_size);
980         }
981 
982         atmci_pdc_cleanup(host);
983 
984         dev_dbg(&host->pdev->dev, "(%s) set pending xfer complete\n", __func__);
985         atmci_set_pending(host, EVENT_XFER_COMPLETE);
986         tasklet_schedule(&host->tasklet);
987 }
988 
989 static void atmci_dma_cleanup(struct atmel_mci *host)
990 {
991         struct mmc_data                 *data = host->data;
992 
993         if (data)
994                 dma_unmap_sg(host->dma.chan->device->dev,
995                                 data->sg, data->sg_len,
996                                 ((data->flags & MMC_DATA_WRITE)
997                                  ? DMA_TO_DEVICE : DMA_FROM_DEVICE));
998 }
999 
1000 /*
1001  * This function is called by the DMA driver from tasklet context.
1002  */
1003 static void atmci_dma_complete(void *arg)
1004 {
1005         struct atmel_mci        *host = arg;
1006         struct mmc_data         *data = host->data;
1007 
1008         dev_vdbg(&host->pdev->dev, "DMA complete\n");
1009 
1010         if (host->caps.has_dma_conf_reg)
1011                 /* Disable DMA hardware handshaking on MCI */
1012                 atmci_writel(host, ATMCI_DMA, atmci_readl(host, ATMCI_DMA) & ~ATMCI_DMAEN);
1013 
1014         atmci_dma_cleanup(host);
1015 
1016         /*
1017          * If the card was removed, data will be NULL. No point trying
1018          * to send the stop command or waiting for NBUSY in this case.
1019          */
1020         if (data) {
1021                 dev_dbg(&host->pdev->dev,
1022                         "(%s) set pending xfer complete\n", __func__);
1023                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1024                 tasklet_schedule(&host->tasklet);
1025 
1026                 /*
1027                  * Regardless of what the documentation says, we have
1028                  * to wait for NOTBUSY even after block read
1029                  * operations.
1030                  *
1031                  * When the DMA transfer is complete, the controller
1032                  * may still be reading the CRC from the card, i.e.
1033                  * the data transfer is still in progress and we
1034                  * haven't seen all the potential error bits yet.
1035                  *
1036                  * The interrupt handler will schedule a different
1037                  * tasklet to finish things up when the data transfer
1038                  * is completely done.
1039                  *
1040                  * We may not complete the mmc request here anyway
1041                  * because the mmc layer may call back and cause us to
1042                  * violate the "don't submit new operations from the
1043                  * completion callback" rule of the dma engine
1044                  * framework.
1045                  */
1046                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1047         }
1048 }
1049 
1050 /*
1051  * Returns a mask of interrupt flags to be enabled after the whole
1052  * request has been prepared.
1053  */
1054 static u32 atmci_prepare_data(struct atmel_mci *host, struct mmc_data *data)
1055 {
1056         u32 iflags;
1057 
1058         data->error = -EINPROGRESS;
1059 
1060         host->sg = data->sg;
1061         host->sg_len = data->sg_len;
1062         host->data = data;
1063         host->data_chan = NULL;
1064 
1065         iflags = ATMCI_DATA_ERROR_FLAGS;
1066 
1067         /*
1068          * Errata: MMC data write operation with less than 12
1069          * bytes is impossible.
1070          *
1071          * Errata: MCI Transmit Data Register (TDR) FIFO
1072          * corruption when length is not multiple of 4.
1073          */
1074         if (data->blocks * data->blksz < 12
1075                         || (data->blocks * data->blksz) & 3)
1076                 host->need_reset = true;
1077 
1078         host->pio_offset = 0;
1079         if (data->flags & MMC_DATA_READ)
1080                 iflags |= ATMCI_RXRDY;
1081         else
1082                 iflags |= ATMCI_TXRDY;
1083 
1084         return iflags;
1085 }
1086 
1087 /*
1088  * Set interrupt flags and set block length into the MCI mode register even
1089  * if this value is also accessible in the MCI block register. It seems to be
1090  * necessary before the High Speed MCI version. It also map sg and configure
1091  * PDC registers.
1092  */
1093 static u32
1094 atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1095 {
1096         u32 iflags, tmp;
1097         unsigned int sg_len;
1098         enum dma_data_direction dir;
1099         int i;
1100 
1101         data->error = -EINPROGRESS;
1102 
1103         host->data = data;
1104         host->sg = data->sg;
1105         iflags = ATMCI_DATA_ERROR_FLAGS;
1106 
1107         /* Enable pdc mode */
1108         atmci_writel(host, ATMCI_MR, host->mode_reg | ATMCI_MR_PDCMODE);
1109 
1110         if (data->flags & MMC_DATA_READ) {
1111                 dir = DMA_FROM_DEVICE;
1112                 iflags |= ATMCI_ENDRX | ATMCI_RXBUFF;
1113         } else {
1114                 dir = DMA_TO_DEVICE;
1115                 iflags |= ATMCI_ENDTX | ATMCI_TXBUFE | ATMCI_BLKE;
1116         }
1117 
1118         /* Set BLKLEN */
1119         tmp = atmci_readl(host, ATMCI_MR);
1120         tmp &= 0x0000ffff;
1121         tmp |= ATMCI_BLKLEN(data->blksz);
1122         atmci_writel(host, ATMCI_MR, tmp);
1123 
1124         /* Configure PDC */
1125         host->data_size = data->blocks * data->blksz;
1126         sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
1127 
1128         if ((!host->caps.has_rwproof)
1129             && (host->data->flags & MMC_DATA_WRITE)) {
1130                 sg_copy_to_buffer(host->data->sg, host->data->sg_len,
1131                                   host->buffer, host->data_size);
1132                 if (host->caps.has_bad_data_ordering)
1133                         for (i = 0; i < host->data_size; i++)
1134                                 host->buffer[i] = swab32(host->buffer[i]);
1135         }
1136 
1137         if (host->data_size)
1138                 atmci_pdc_set_both_buf(host,
1139                         ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));
1140 
1141         return iflags;
1142 }
1143 
1144 static u32
1145 atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
1146 {
1147         struct dma_chan                 *chan;
1148         struct dma_async_tx_descriptor  *desc;
1149         struct scatterlist              *sg;
1150         unsigned int                    i;
1151         enum dma_data_direction         direction;
1152         enum dma_transfer_direction     slave_dirn;
1153         unsigned int                    sglen;
1154         u32                             maxburst;
1155         u32 iflags;
1156 
1157         data->error = -EINPROGRESS;
1158 
1159         WARN_ON(host->data);
1160         host->sg = NULL;
1161         host->data = data;
1162 
1163         iflags = ATMCI_DATA_ERROR_FLAGS;
1164 
1165         /*
1166          * We don't do DMA on "complex" transfers, i.e. with
1167          * non-word-aligned buffers or lengths. Also, we don't bother
1168          * with all the DMA setup overhead for short transfers.
1169          */
1170         if (data->blocks * data->blksz < ATMCI_DMA_THRESHOLD)
1171                 return atmci_prepare_data(host, data);
1172         if (data->blksz & 3)
1173                 return atmci_prepare_data(host, data);
1174 
1175         for_each_sg(data->sg, sg, data->sg_len, i) {
1176                 if (sg->offset & 3 || sg->length & 3)
1177                         return atmci_prepare_data(host, data);
1178         }
1179 
1180         /* If we don't have a channel, we can't do DMA */
1181         chan = host->dma.chan;
1182         if (chan)
1183                 host->data_chan = chan;
1184 
1185         if (!chan)
1186                 return -ENODEV;
1187 
1188         if (data->flags & MMC_DATA_READ) {
1189                 direction = DMA_FROM_DEVICE;
1190                 host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
1191                 maxburst = atmci_convert_chksize(host,
1192                                                  host->dma_conf.src_maxburst);
1193         } else {
1194                 direction = DMA_TO_DEVICE;
1195                 host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
1196                 maxburst = atmci_convert_chksize(host,
1197                                                  host->dma_conf.dst_maxburst);
1198         }
1199 
1200         if (host->caps.has_dma_conf_reg)
1201                 atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) |
1202                         ATMCI_DMAEN);
1203 
1204         sglen = dma_map_sg(chan->device->dev, data->sg,
1205                         data->sg_len, direction);
1206 
1207         dmaengine_slave_config(chan, &host->dma_conf);
1208         desc = dmaengine_prep_slave_sg(chan,
1209                         data->sg, sglen, slave_dirn,
1210                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1211         if (!desc)
1212                 goto unmap_exit;
1213 
1214         host->dma.data_desc = desc;
1215         desc->callback = atmci_dma_complete;
1216         desc->callback_param = host;
1217 
1218         return iflags;
1219 unmap_exit:
1220         dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, direction);
1221         return -ENOMEM;
1222 }
1223 
1224 static void
1225 atmci_submit_data(struct atmel_mci *host, struct mmc_data *data)
1226 {
1227         return;
1228 }
1229 
1230 /*
1231  * Start PDC according to transfer direction.
1232  */
1233 static void
1234 atmci_submit_data_pdc(struct atmel_mci *host, struct mmc_data *data)
1235 {
1236         if (data->flags & MMC_DATA_READ)
1237                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTEN);
1238         else
1239                 atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_TXTEN);
1240 }
1241 
1242 static void
1243 atmci_submit_data_dma(struct atmel_mci *host, struct mmc_data *data)
1244 {
1245         struct dma_chan                 *chan = host->data_chan;
1246         struct dma_async_tx_descriptor  *desc = host->dma.data_desc;
1247 
1248         if (chan) {
1249                 dmaengine_submit(desc);
1250                 dma_async_issue_pending(chan);
1251         }
1252 }
1253 
1254 static void atmci_stop_transfer(struct atmel_mci *host)
1255 {
1256         dev_dbg(&host->pdev->dev,
1257                 "(%s) set pending xfer complete\n", __func__);
1258         atmci_set_pending(host, EVENT_XFER_COMPLETE);
1259         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1260 }
1261 
1262 /*
1263  * Stop data transfer because error(s) occurred.
1264  */
1265 static void atmci_stop_transfer_pdc(struct atmel_mci *host)
1266 {
1267         atmci_writel(host, ATMEL_PDC_PTCR, ATMEL_PDC_RXTDIS | ATMEL_PDC_TXTDIS);
1268 }
1269 
1270 static void atmci_stop_transfer_dma(struct atmel_mci *host)
1271 {
1272         struct dma_chan *chan = host->data_chan;
1273 
1274         if (chan) {
1275                 dmaengine_terminate_all(chan);
1276                 atmci_dma_cleanup(host);
1277         } else {
1278                 /* Data transfer was stopped by the interrupt handler */
1279                 dev_dbg(&host->pdev->dev,
1280                         "(%s) set pending xfer complete\n", __func__);
1281                 atmci_set_pending(host, EVENT_XFER_COMPLETE);
1282                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1283         }
1284 }
1285 
1286 /*
1287  * Start a request: prepare data if needed, prepare the command and activate
1288  * interrupts.
1289  */
1290 static void atmci_start_request(struct atmel_mci *host,
1291                 struct atmel_mci_slot *slot)
1292 {
1293         struct mmc_request      *mrq;
1294         struct mmc_command      *cmd;
1295         struct mmc_data         *data;
1296         u32                     iflags;
1297         u32                     cmdflags;
1298 
1299         mrq = slot->mrq;
1300         host->cur_slot = slot;
1301         host->mrq = mrq;
1302 
1303         host->pending_events = 0;
1304         host->completed_events = 0;
1305         host->cmd_status = 0;
1306         host->data_status = 0;
1307 
1308         dev_dbg(&host->pdev->dev, "start request: cmd %u\n", mrq->cmd->opcode);
1309 
1310         if (host->need_reset || host->caps.need_reset_after_xfer) {
1311                 iflags = atmci_readl(host, ATMCI_IMR);
1312                 iflags &= (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB);
1313                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1314                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1315                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1316                 if (host->caps.has_cfg_reg)
1317                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1318                 atmci_writel(host, ATMCI_IER, iflags);
1319                 host->need_reset = false;
1320         }
1321         atmci_writel(host, ATMCI_SDCR, slot->sdc_reg);
1322 
1323         iflags = atmci_readl(host, ATMCI_IMR);
1324         if (iflags & ~(ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
1325                 dev_dbg(&slot->mmc->class_dev, "WARNING: IMR=0x%08x\n",
1326                                 iflags);
1327 
1328         if (unlikely(test_and_clear_bit(ATMCI_CARD_NEED_INIT, &slot->flags))) {
1329                 /* Send init sequence (74 clock cycles) */
1330                 atmci_writel(host, ATMCI_CMDR, ATMCI_CMDR_SPCMD_INIT);
1331                 while (!(atmci_readl(host, ATMCI_SR) & ATMCI_CMDRDY))
1332                         cpu_relax();
1333         }
1334         iflags = 0;
1335         data = mrq->data;
1336         if (data) {
1337                 atmci_set_timeout(host, slot, data);
1338 
1339                 /* Must set block count/size before sending command */
1340                 atmci_writel(host, ATMCI_BLKR, ATMCI_BCNT(data->blocks)
1341                                 | ATMCI_BLKLEN(data->blksz));
1342                 dev_vdbg(&slot->mmc->class_dev, "BLKR=0x%08x\n",
1343                         ATMCI_BCNT(data->blocks) | ATMCI_BLKLEN(data->blksz));
1344 
1345                 iflags |= host->prepare_data(host, data);
1346         }
1347 
1348         iflags |= ATMCI_CMDRDY;
1349         cmd = mrq->cmd;
1350         cmdflags = atmci_prepare_command(slot->mmc, cmd);
1351 
1352         /*
1353          * DMA transfer should be started before sending the command to avoid
1354          * unexpected errors especially for read operations in SDIO mode.
1355          * Unfortunately, in PDC mode, command has to be sent before starting
1356          * the transfer.
1357          */
1358         if (host->submit_data != &atmci_submit_data_dma)
1359                 atmci_send_command(host, cmd, cmdflags);
1360 
1361         if (data)
1362                 host->submit_data(host, data);
1363 
1364         if (host->submit_data == &atmci_submit_data_dma)
1365                 atmci_send_command(host, cmd, cmdflags);
1366 
1367         if (mrq->stop) {
1368                 host->stop_cmdr = atmci_prepare_command(slot->mmc, mrq->stop);
1369                 host->stop_cmdr |= ATMCI_CMDR_STOP_XFER;
1370                 if (!(data->flags & MMC_DATA_WRITE))
1371                         host->stop_cmdr |= ATMCI_CMDR_TRDIR_READ;
1372                 host->stop_cmdr |= ATMCI_CMDR_MULTI_BLOCK;
1373         }
1374 
1375         /*
1376          * We could have enabled interrupts earlier, but I suspect
1377          * that would open up a nice can of interesting race
1378          * conditions (e.g. command and data complete, but stop not
1379          * prepared yet.)
1380          */
1381         atmci_writel(host, ATMCI_IER, iflags);
1382 
1383         mod_timer(&host->timer, jiffies +  msecs_to_jiffies(2000));
1384 }
1385 
1386 static void atmci_queue_request(struct atmel_mci *host,
1387                 struct atmel_mci_slot *slot, struct mmc_request *mrq)
1388 {
1389         dev_vdbg(&slot->mmc->class_dev, "queue request: state=%d\n",
1390                         host->state);
1391 
1392         spin_lock_bh(&host->lock);
1393         slot->mrq = mrq;
1394         if (host->state == STATE_IDLE) {
1395                 host->state = STATE_SENDING_CMD;
1396                 atmci_start_request(host, slot);
1397         } else {
1398                 dev_dbg(&host->pdev->dev, "queue request\n");
1399                 list_add_tail(&slot->queue_node, &host->queue);
1400         }
1401         spin_unlock_bh(&host->lock);
1402 }
1403 
1404 static void atmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
1405 {
1406         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1407         struct atmel_mci        *host = slot->host;
1408         struct mmc_data         *data;
1409 
1410         WARN_ON(slot->mrq);
1411         dev_dbg(&host->pdev->dev, "MRQ: cmd %u\n", mrq->cmd->opcode);
1412 
1413         pm_runtime_get_sync(&host->pdev->dev);
1414 
1415         /*
1416          * We may "know" the card is gone even though there's still an
1417          * electrical connection. If so, we really need to communicate
1418          * this to the MMC core since there won't be any more
1419          * interrupts as the card is completely removed. Otherwise,
1420          * the MMC core might believe the card is still there even
1421          * though the card was just removed very slowly.
1422          */
1423         if (!test_bit(ATMCI_CARD_PRESENT, &slot->flags)) {
1424                 mrq->cmd->error = -ENOMEDIUM;
1425                 mmc_request_done(mmc, mrq);
1426                 return;
1427         }
1428 
1429         /* We don't support multiple blocks of weird lengths. */
1430         data = mrq->data;
1431         if (data && data->blocks > 1 && data->blksz & 3) {
1432                 mrq->cmd->error = -EINVAL;
1433                 mmc_request_done(mmc, mrq);
1434         }
1435 
1436         atmci_queue_request(host, slot, mrq);
1437 }
1438 
1439 static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
1440 {
1441         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1442         struct atmel_mci        *host = slot->host;
1443         unsigned int            i;
1444 
1445         pm_runtime_get_sync(&host->pdev->dev);
1446 
1447         slot->sdc_reg &= ~ATMCI_SDCBUS_MASK;
1448         switch (ios->bus_width) {
1449         case MMC_BUS_WIDTH_1:
1450                 slot->sdc_reg |= ATMCI_SDCBUS_1BIT;
1451                 break;
1452         case MMC_BUS_WIDTH_4:
1453                 slot->sdc_reg |= ATMCI_SDCBUS_4BIT;
1454                 break;
1455         }
1456 
1457         if (ios->clock) {
1458                 unsigned int clock_min = ~0U;
1459                 int clkdiv;
1460 
1461                 spin_lock_bh(&host->lock);
1462                 if (!host->mode_reg) {
1463                         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1464                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1465                         if (host->caps.has_cfg_reg)
1466                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1467                 }
1468 
1469                 /*
1470                  * Use mirror of ios->clock to prevent race with mmc
1471                  * core ios update when finding the minimum.
1472                  */
1473                 slot->clock = ios->clock;
1474                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1475                         if (host->slot[i] && host->slot[i]->clock
1476                                         && host->slot[i]->clock < clock_min)
1477                                 clock_min = host->slot[i]->clock;
1478                 }
1479 
1480                 /* Calculate clock divider */
1481                 if (host->caps.has_odd_clk_div) {
1482                         clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
1483                         if (clkdiv < 0) {
1484                                 dev_warn(&mmc->class_dev,
1485                                          "clock %u too fast; using %lu\n",
1486                                          clock_min, host->bus_hz / 2);
1487                                 clkdiv = 0;
1488                         } else if (clkdiv > 511) {
1489                                 dev_warn(&mmc->class_dev,
1490                                          "clock %u too slow; using %lu\n",
1491                                          clock_min, host->bus_hz / (511 + 2));
1492                                 clkdiv = 511;
1493                         }
1494                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv >> 1)
1495                                          | ATMCI_MR_CLKODD(clkdiv & 1);
1496                 } else {
1497                         clkdiv = DIV_ROUND_UP(host->bus_hz, 2 * clock_min) - 1;
1498                         if (clkdiv > 255) {
1499                                 dev_warn(&mmc->class_dev,
1500                                          "clock %u too slow; using %lu\n",
1501                                          clock_min, host->bus_hz / (2 * 256));
1502                                 clkdiv = 255;
1503                         }
1504                         host->mode_reg = ATMCI_MR_CLKDIV(clkdiv);
1505                 }
1506 
1507                 /*
1508                  * WRPROOF and RDPROOF prevent overruns/underruns by
1509                  * stopping the clock when the FIFO is full/empty.
1510                  * This state is not expected to last for long.
1511                  */
1512                 if (host->caps.has_rwproof)
1513                         host->mode_reg |= (ATMCI_MR_WRPROOF | ATMCI_MR_RDPROOF);
1514 
1515                 if (host->caps.has_cfg_reg) {
1516                         /* setup High Speed mode in relation with card capacity */
1517                         if (ios->timing == MMC_TIMING_SD_HS)
1518                                 host->cfg_reg |= ATMCI_CFG_HSMODE;
1519                         else
1520                                 host->cfg_reg &= ~ATMCI_CFG_HSMODE;
1521                 }
1522 
1523                 if (list_empty(&host->queue)) {
1524                         atmci_writel(host, ATMCI_MR, host->mode_reg);
1525                         if (host->caps.has_cfg_reg)
1526                                 atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1527                 } else {
1528                         host->need_clock_update = true;
1529                 }
1530 
1531                 spin_unlock_bh(&host->lock);
1532         } else {
1533                 bool any_slot_active = false;
1534 
1535                 spin_lock_bh(&host->lock);
1536                 slot->clock = 0;
1537                 for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
1538                         if (host->slot[i] && host->slot[i]->clock) {
1539                                 any_slot_active = true;
1540                                 break;
1541                         }
1542                 }
1543                 if (!any_slot_active) {
1544                         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
1545                         if (host->mode_reg) {
1546                                 atmci_readl(host, ATMCI_MR);
1547                         }
1548                         host->mode_reg = 0;
1549                 }
1550                 spin_unlock_bh(&host->lock);
1551         }
1552 
1553         switch (ios->power_mode) {
1554         case MMC_POWER_OFF:
1555                 if (!IS_ERR(mmc->supply.vmmc))
1556                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
1557                 break;
1558         case MMC_POWER_UP:
1559                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
1560                 if (!IS_ERR(mmc->supply.vmmc))
1561                         mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
1562                 break;
1563         default:
1564                 /*
1565                  * TODO: None of the currently available AVR32-based
1566                  * boards allow MMC power to be turned off. Implement
1567                  * power control when this can be tested properly.
1568                  *
1569                  * We also need to hook this into the clock management
1570                  * somehow so that newly inserted cards aren't
1571                  * subjected to a fast clock before we have a chance
1572                  * to figure out what the maximum rate is. Currently,
1573                  * there's no way to avoid this, and there never will
1574                  * be for boards that don't support power control.
1575                  */
1576                 break;
1577         }
1578 
1579         pm_runtime_mark_last_busy(&host->pdev->dev);
1580         pm_runtime_put_autosuspend(&host->pdev->dev);
1581 }
1582 
1583 static int atmci_get_ro(struct mmc_host *mmc)
1584 {
1585         int                     read_only = -ENOSYS;
1586         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1587 
1588         if (gpio_is_valid(slot->wp_pin)) {
1589                 read_only = gpio_get_value(slot->wp_pin);
1590                 dev_dbg(&mmc->class_dev, "card is %s\n",
1591                                 read_only ? "read-only" : "read-write");
1592         }
1593 
1594         return read_only;
1595 }
1596 
1597 static int atmci_get_cd(struct mmc_host *mmc)
1598 {
1599         int                     present = -ENOSYS;
1600         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1601 
1602         if (gpio_is_valid(slot->detect_pin)) {
1603                 present = !(gpio_get_value(slot->detect_pin) ^
1604                             slot->detect_is_active_high);
1605                 dev_dbg(&mmc->class_dev, "card is %spresent\n",
1606                                 present ? "" : "not ");
1607         }
1608 
1609         return present;
1610 }
1611 
1612 static void atmci_enable_sdio_irq(struct mmc_host *mmc, int enable)
1613 {
1614         struct atmel_mci_slot   *slot = mmc_priv(mmc);
1615         struct atmel_mci        *host = slot->host;
1616 
1617         if (enable)
1618                 atmci_writel(host, ATMCI_IER, slot->sdio_irq);
1619         else
1620                 atmci_writel(host, ATMCI_IDR, slot->sdio_irq);
1621 }
1622 
1623 static const struct mmc_host_ops atmci_ops = {
1624         .request        = atmci_request,
1625         .set_ios        = atmci_set_ios,
1626         .get_ro         = atmci_get_ro,
1627         .get_cd         = atmci_get_cd,
1628         .enable_sdio_irq = atmci_enable_sdio_irq,
1629 };
1630 
1631 /* Called with host->lock held */
1632 static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
1633         __releases(&host->lock)
1634         __acquires(&host->lock)
1635 {
1636         struct atmel_mci_slot   *slot = NULL;
1637         struct mmc_host         *prev_mmc = host->cur_slot->mmc;
1638 
1639         WARN_ON(host->cmd || host->data);
1640 
1641         /*
1642          * Update the MMC clock rate if necessary. This may be
1643          * necessary if set_ios() is called when a different slot is
1644          * busy transferring data.
1645          */
1646         if (host->need_clock_update) {
1647                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1648                 if (host->caps.has_cfg_reg)
1649                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1650         }
1651 
1652         host->cur_slot->mrq = NULL;
1653         host->mrq = NULL;
1654         if (!list_empty(&host->queue)) {
1655                 slot = list_entry(host->queue.next,
1656                                 struct atmel_mci_slot, queue_node);
1657                 list_del(&slot->queue_node);
1658                 dev_vdbg(&host->pdev->dev, "list not empty: %s is next\n",
1659                                 mmc_hostname(slot->mmc));
1660                 host->state = STATE_SENDING_CMD;
1661                 atmci_start_request(host, slot);
1662         } else {
1663                 dev_vdbg(&host->pdev->dev, "list empty\n");
1664                 host->state = STATE_IDLE;
1665         }
1666 
1667         del_timer(&host->timer);
1668 
1669         spin_unlock(&host->lock);
1670         mmc_request_done(prev_mmc, mrq);
1671         spin_lock(&host->lock);
1672 
1673         pm_runtime_mark_last_busy(&host->pdev->dev);
1674         pm_runtime_put_autosuspend(&host->pdev->dev);
1675 }
1676 
1677 static void atmci_command_complete(struct atmel_mci *host,
1678                         struct mmc_command *cmd)
1679 {
1680         u32             status = host->cmd_status;
1681 
1682         /* Read the response from the card (up to 16 bytes) */
1683         cmd->resp[0] = atmci_readl(host, ATMCI_RSPR);
1684         cmd->resp[1] = atmci_readl(host, ATMCI_RSPR);
1685         cmd->resp[2] = atmci_readl(host, ATMCI_RSPR);
1686         cmd->resp[3] = atmci_readl(host, ATMCI_RSPR);
1687 
1688         if (status & ATMCI_RTOE)
1689                 cmd->error = -ETIMEDOUT;
1690         else if ((cmd->flags & MMC_RSP_CRC) && (status & ATMCI_RCRCE))
1691                 cmd->error = -EILSEQ;
1692         else if (status & (ATMCI_RINDE | ATMCI_RDIRE | ATMCI_RENDE))
1693                 cmd->error = -EIO;
1694         else if (host->mrq->data && (host->mrq->data->blksz & 3)) {
1695                 if (host->caps.need_blksz_mul_4) {
1696                         cmd->error = -EINVAL;
1697                         host->need_reset = 1;
1698                 }
1699         } else
1700                 cmd->error = 0;
1701 }
1702 
1703 static void atmci_detect_change(unsigned long data)
1704 {
1705         struct atmel_mci_slot   *slot = (struct atmel_mci_slot *)data;
1706         bool                    present;
1707         bool                    present_old;
1708 
1709         /*
1710          * atmci_cleanup_slot() sets the ATMCI_SHUTDOWN flag before
1711          * freeing the interrupt. We must not re-enable the interrupt
1712          * if it has been freed, and if we're shutting down, it
1713          * doesn't really matter whether the card is present or not.
1714          */
1715         smp_rmb();
1716         if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
1717                 return;
1718 
1719         enable_irq(gpio_to_irq(slot->detect_pin));
1720         present = !(gpio_get_value(slot->detect_pin) ^
1721                     slot->detect_is_active_high);
1722         present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
1723 
1724         dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
1725                         present, present_old);
1726 
1727         if (present != present_old) {
1728                 struct atmel_mci        *host = slot->host;
1729                 struct mmc_request      *mrq;
1730 
1731                 dev_dbg(&slot->mmc->class_dev, "card %s\n",
1732                         present ? "inserted" : "removed");
1733 
1734                 spin_lock(&host->lock);
1735 
1736                 if (!present)
1737                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
1738                 else
1739                         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
1740 
1741                 /* Clean up queue if present */
1742                 mrq = slot->mrq;
1743                 if (mrq) {
1744                         if (mrq == host->mrq) {
1745                                 /*
1746                                  * Reset controller to terminate any ongoing
1747                                  * commands or data transfers.
1748                                  */
1749                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
1750                                 atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIEN);
1751                                 atmci_writel(host, ATMCI_MR, host->mode_reg);
1752                                 if (host->caps.has_cfg_reg)
1753                                         atmci_writel(host, ATMCI_CFG, host->cfg_reg);
1754 
1755                                 host->data = NULL;
1756                                 host->cmd = NULL;
1757 
1758                                 switch (host->state) {
1759                                 case STATE_IDLE:
1760                                         break;
1761                                 case STATE_SENDING_CMD:
1762                                         mrq->cmd->error = -ENOMEDIUM;
1763                                         if (mrq->data)
1764                                                 host->stop_transfer(host);
1765                                         break;
1766                                 case STATE_DATA_XFER:
1767                                         mrq->data->error = -ENOMEDIUM;
1768                                         host->stop_transfer(host);
1769                                         break;
1770                                 case STATE_WAITING_NOTBUSY:
1771                                         mrq->data->error = -ENOMEDIUM;
1772                                         break;
1773                                 case STATE_SENDING_STOP:
1774                                         mrq->stop->error = -ENOMEDIUM;
1775                                         break;
1776                                 case STATE_END_REQUEST:
1777                                         break;
1778                                 }
1779 
1780                                 atmci_request_end(host, mrq);
1781                         } else {
1782                                 list_del(&slot->queue_node);
1783                                 mrq->cmd->error = -ENOMEDIUM;
1784                                 if (mrq->data)
1785                                         mrq->data->error = -ENOMEDIUM;
1786                                 if (mrq->stop)
1787                                         mrq->stop->error = -ENOMEDIUM;
1788 
1789                                 spin_unlock(&host->lock);
1790                                 mmc_request_done(slot->mmc, mrq);
1791                                 spin_lock(&host->lock);
1792                         }
1793                 }
1794                 spin_unlock(&host->lock);
1795 
1796                 mmc_detect_change(slot->mmc, 0);
1797         }
1798 }
1799 
1800 static void atmci_tasklet_func(unsigned long priv)
1801 {
1802         struct atmel_mci        *host = (struct atmel_mci *)priv;
1803         struct mmc_request      *mrq = host->mrq;
1804         struct mmc_data         *data = host->data;
1805         enum atmel_mci_state    state = host->state;
1806         enum atmel_mci_state    prev_state;
1807         u32                     status;
1808 
1809         spin_lock(&host->lock);
1810 
1811         state = host->state;
1812 
1813         dev_vdbg(&host->pdev->dev,
1814                 "tasklet: state %u pending/completed/mask %lx/%lx/%x\n",
1815                 state, host->pending_events, host->completed_events,
1816                 atmci_readl(host, ATMCI_IMR));
1817 
1818         do {
1819                 prev_state = state;
1820                 dev_dbg(&host->pdev->dev, "FSM: state=%d\n", state);
1821 
1822                 switch (state) {
1823                 case STATE_IDLE:
1824                         break;
1825 
1826                 case STATE_SENDING_CMD:
1827                         /*
1828                          * Command has been sent, we are waiting for command
1829                          * ready. Then we have three next states possible:
1830                          * END_REQUEST by default, WAITING_NOTBUSY if it's a
1831                          * command needing it or DATA_XFER if there is data.
1832                          */
1833                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1834                         if (!atmci_test_and_clear_pending(host,
1835                                                 EVENT_CMD_RDY))
1836                                 break;
1837 
1838                         dev_dbg(&host->pdev->dev, "set completed cmd ready\n");
1839                         host->cmd = NULL;
1840                         atmci_set_completed(host, EVENT_CMD_RDY);
1841                         atmci_command_complete(host, mrq->cmd);
1842                         if (mrq->data) {
1843                                 dev_dbg(&host->pdev->dev,
1844                                         "command with data transfer");
1845                                 /*
1846                                  * If there is a command error don't start
1847                                  * data transfer.
1848                                  */
1849                                 if (mrq->cmd->error) {
1850                                         host->stop_transfer(host);
1851                                         host->data = NULL;
1852                                         atmci_writel(host, ATMCI_IDR,
1853                                                      ATMCI_TXRDY | ATMCI_RXRDY
1854                                                      | ATMCI_DATA_ERROR_FLAGS);
1855                                         state = STATE_END_REQUEST;
1856                                 } else
1857                                         state = STATE_DATA_XFER;
1858                         } else if ((!mrq->data) && (mrq->cmd->flags & MMC_RSP_BUSY)) {
1859                                 dev_dbg(&host->pdev->dev,
1860                                         "command response need waiting notbusy");
1861                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1862                                 state = STATE_WAITING_NOTBUSY;
1863                         } else
1864                                 state = STATE_END_REQUEST;
1865 
1866                         break;
1867 
1868                 case STATE_DATA_XFER:
1869                         if (atmci_test_and_clear_pending(host,
1870                                                 EVENT_DATA_ERROR)) {
1871                                 dev_dbg(&host->pdev->dev, "set completed data error\n");
1872                                 atmci_set_completed(host, EVENT_DATA_ERROR);
1873                                 state = STATE_END_REQUEST;
1874                                 break;
1875                         }
1876 
1877                         /*
1878                          * A data transfer is in progress. The event expected
1879                          * to move to the next state depends of data transfer
1880                          * type (PDC or DMA). Once transfer done we can move
1881                          * to the next step which is WAITING_NOTBUSY in write
1882                          * case and directly SENDING_STOP in read case.
1883                          */
1884                         dev_dbg(&host->pdev->dev, "FSM: xfer complete?\n");
1885                         if (!atmci_test_and_clear_pending(host,
1886                                                 EVENT_XFER_COMPLETE))
1887                                 break;
1888 
1889                         dev_dbg(&host->pdev->dev,
1890                                 "(%s) set completed xfer complete\n",
1891                                 __func__);
1892                         atmci_set_completed(host, EVENT_XFER_COMPLETE);
1893 
1894                         if (host->caps.need_notbusy_for_read_ops ||
1895                            (host->data->flags & MMC_DATA_WRITE)) {
1896                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1897                                 state = STATE_WAITING_NOTBUSY;
1898                         } else if (host->mrq->stop) {
1899                                 atmci_writel(host, ATMCI_IER, ATMCI_CMDRDY);
1900                                 atmci_send_stop_cmd(host, data);
1901                                 state = STATE_SENDING_STOP;
1902                         } else {
1903                                 host->data = NULL;
1904                                 data->bytes_xfered = data->blocks * data->blksz;
1905                                 data->error = 0;
1906                                 state = STATE_END_REQUEST;
1907                         }
1908                         break;
1909 
1910                 case STATE_WAITING_NOTBUSY:
1911                         /*
1912                          * We can be in the state for two reasons: a command
1913                          * requiring waiting not busy signal (stop command
1914                          * included) or a write operation. In the latest case,
1915                          * we need to send a stop command.
1916                          */
1917                         dev_dbg(&host->pdev->dev, "FSM: not busy?\n");
1918                         if (!atmci_test_and_clear_pending(host,
1919                                                 EVENT_NOTBUSY))
1920                                 break;
1921 
1922                         dev_dbg(&host->pdev->dev, "set completed not busy\n");
1923                         atmci_set_completed(host, EVENT_NOTBUSY);
1924 
1925                         if (host->data) {
1926                                 /*
1927                                  * For some commands such as CMD53, even if
1928                                  * there is data transfer, there is no stop
1929                                  * command to send.
1930                                  */
1931                                 if (host->mrq->stop) {
1932                                         atmci_writel(host, ATMCI_IER,
1933                                                      ATMCI_CMDRDY);
1934                                         atmci_send_stop_cmd(host, data);
1935                                         state = STATE_SENDING_STOP;
1936                                 } else {
1937                                         host->data = NULL;
1938                                         data->bytes_xfered = data->blocks
1939                                                              * data->blksz;
1940                                         data->error = 0;
1941                                         state = STATE_END_REQUEST;
1942                                 }
1943                         } else
1944                                 state = STATE_END_REQUEST;
1945                         break;
1946 
1947                 case STATE_SENDING_STOP:
1948                         /*
1949                          * In this state, it is important to set host->data to
1950                          * NULL (which is tested in the waiting notbusy state)
1951                          * in order to go to the end request state instead of
1952                          * sending stop again.
1953                          */
1954                         dev_dbg(&host->pdev->dev, "FSM: cmd ready?\n");
1955                         if (!atmci_test_and_clear_pending(host,
1956                                                 EVENT_CMD_RDY))
1957                                 break;
1958 
1959                         dev_dbg(&host->pdev->dev, "FSM: cmd ready\n");
1960                         host->cmd = NULL;
1961                         data->bytes_xfered = data->blocks * data->blksz;
1962                         data->error = 0;
1963                         atmci_command_complete(host, mrq->stop);
1964                         if (mrq->stop->error) {
1965                                 host->stop_transfer(host);
1966                                 atmci_writel(host, ATMCI_IDR,
1967                                              ATMCI_TXRDY | ATMCI_RXRDY
1968                                              | ATMCI_DATA_ERROR_FLAGS);
1969                                 state = STATE_END_REQUEST;
1970                         } else {
1971                                 atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
1972                                 state = STATE_WAITING_NOTBUSY;
1973                         }
1974                         host->data = NULL;
1975                         break;
1976 
1977                 case STATE_END_REQUEST:
1978                         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY | ATMCI_RXRDY
1979                                            | ATMCI_DATA_ERROR_FLAGS);
1980                         status = host->data_status;
1981                         if (unlikely(status)) {
1982                                 host->stop_transfer(host);
1983                                 host->data = NULL;
1984                                 if (data) {
1985                                         if (status & ATMCI_DTOE) {
1986                                                 data->error = -ETIMEDOUT;
1987                                         } else if (status & ATMCI_DCRCE) {
1988                                                 data->error = -EILSEQ;
1989                                         } else {
1990                                                 data->error = -EIO;
1991                                         }
1992                                 }
1993                         }
1994 
1995                         atmci_request_end(host, host->mrq);
1996                         state = STATE_IDLE;
1997                         break;
1998                 }
1999         } while (state != prev_state);
2000 
2001         host->state = state;
2002 
2003         spin_unlock(&host->lock);
2004 }
2005 
2006 static void atmci_read_data_pio(struct atmel_mci *host)
2007 {
2008         struct scatterlist      *sg = host->sg;
2009         void                    *buf = sg_virt(sg);
2010         unsigned int            offset = host->pio_offset;
2011         struct mmc_data         *data = host->data;
2012         u32                     value;
2013         u32                     status;
2014         unsigned int            nbytes = 0;
2015 
2016         do {
2017                 value = atmci_readl(host, ATMCI_RDR);
2018                 if (likely(offset + 4 <= sg->length)) {
2019                         put_unaligned(value, (u32 *)(buf + offset));
2020 
2021                         offset += 4;
2022                         nbytes += 4;
2023 
2024                         if (offset == sg->length) {
2025                                 flush_dcache_page(sg_page(sg));
2026                                 host->sg = sg = sg_next(sg);
2027                                 host->sg_len--;
2028                                 if (!sg || !host->sg_len)
2029                                         goto done;
2030 
2031                                 offset = 0;
2032                                 buf = sg_virt(sg);
2033                         }
2034                 } else {
2035                         unsigned int remaining = sg->length - offset;
2036                         memcpy(buf + offset, &value, remaining);
2037                         nbytes += remaining;
2038 
2039                         flush_dcache_page(sg_page(sg));
2040                         host->sg = sg = sg_next(sg);
2041                         host->sg_len--;
2042                         if (!sg || !host->sg_len)
2043                                 goto done;
2044 
2045                         offset = 4 - remaining;
2046                         buf = sg_virt(sg);
2047                         memcpy(buf, (u8 *)&value + remaining, offset);
2048                         nbytes += offset;
2049                 }
2050 
2051                 status = atmci_readl(host, ATMCI_SR);
2052                 if (status & ATMCI_DATA_ERROR_FLAGS) {
2053                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_RXRDY
2054                                                 | ATMCI_DATA_ERROR_FLAGS));
2055                         host->data_status = status;
2056                         data->bytes_xfered += nbytes;
2057                         return;
2058                 }
2059         } while (status & ATMCI_RXRDY);
2060 
2061         host->pio_offset = offset;
2062         data->bytes_xfered += nbytes;
2063 
2064         return;
2065 
2066 done:
2067         atmci_writel(host, ATMCI_IDR, ATMCI_RXRDY);
2068         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
2069         data->bytes_xfered += nbytes;
2070         smp_wmb();
2071         atmci_set_pending(host, EVENT_XFER_COMPLETE);
2072 }
2073 
2074 static void atmci_write_data_pio(struct atmel_mci *host)
2075 {
2076         struct scatterlist      *sg = host->sg;
2077         void                    *buf = sg_virt(sg);
2078         unsigned int            offset = host->pio_offset;
2079         struct mmc_data         *data = host->data;
2080         u32                     value;
2081         u32                     status;
2082         unsigned int            nbytes = 0;
2083 
2084         do {
2085                 if (likely(offset + 4 <= sg->length)) {
2086                         value = get_unaligned((u32 *)(buf + offset));
2087                         atmci_writel(host, ATMCI_TDR, value);
2088 
2089                         offset += 4;
2090                         nbytes += 4;
2091                         if (offset == sg->length) {
2092                                 host->sg = sg = sg_next(sg);
2093                                 host->sg_len--;
2094                                 if (!sg || !host->sg_len)
2095                                         goto done;
2096 
2097                                 offset = 0;
2098                                 buf = sg_virt(sg);
2099                         }
2100                 } else {
2101                         unsigned int remaining = sg->length - offset;
2102 
2103                         value = 0;
2104                         memcpy(&value, buf + offset, remaining);
2105                         nbytes += remaining;
2106 
2107                         host->sg = sg = sg_next(sg);
2108                         host->sg_len--;
2109                         if (!sg || !host->sg_len) {
2110                                 atmci_writel(host, ATMCI_TDR, value);
2111                                 goto done;
2112                         }
2113 
2114                         offset = 4 - remaining;
2115                         buf = sg_virt(sg);
2116                         memcpy((u8 *)&value + remaining, buf, offset);
2117                         atmci_writel(host, ATMCI_TDR, value);
2118                         nbytes += offset;
2119                 }
2120 
2121                 status = atmci_readl(host, ATMCI_SR);
2122                 if (status & ATMCI_DATA_ERROR_FLAGS) {
2123                         atmci_writel(host, ATMCI_IDR, (ATMCI_NOTBUSY | ATMCI_TXRDY
2124                                                 | ATMCI_DATA_ERROR_FLAGS));
2125                         host->data_status = status;
2126                         data->bytes_xfered += nbytes;
2127                         return;
2128                 }
2129         } while (status & ATMCI_TXRDY);
2130 
2131         host->pio_offset = offset;
2132         data->bytes_xfered += nbytes;
2133 
2134         return;
2135 
2136 done:
2137         atmci_writel(host, ATMCI_IDR, ATMCI_TXRDY);
2138         atmci_writel(host, ATMCI_IER, ATMCI_NOTBUSY);
2139         data->bytes_xfered += nbytes;
2140         smp_wmb();
2141         atmci_set_pending(host, EVENT_XFER_COMPLETE);
2142 }
2143 
2144 static void atmci_sdio_interrupt(struct atmel_mci *host, u32 status)
2145 {
2146         int     i;
2147 
2148         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2149                 struct atmel_mci_slot *slot = host->slot[i];
2150                 if (slot && (status & slot->sdio_irq)) {
2151                         mmc_signal_sdio_irq(slot->mmc);
2152                 }
2153         }
2154 }
2155 
2156 
2157 static irqreturn_t atmci_interrupt(int irq, void *dev_id)
2158 {
2159         struct atmel_mci        *host = dev_id;
2160         u32                     status, mask, pending;
2161         unsigned int            pass_count = 0;
2162 
2163         do {
2164                 status = atmci_readl(host, ATMCI_SR);
2165                 mask = atmci_readl(host, ATMCI_IMR);
2166                 pending = status & mask;
2167                 if (!pending)
2168                         break;
2169 
2170                 if (pending & ATMCI_DATA_ERROR_FLAGS) {
2171                         dev_dbg(&host->pdev->dev, "IRQ: data error\n");
2172                         atmci_writel(host, ATMCI_IDR, ATMCI_DATA_ERROR_FLAGS
2173                                         | ATMCI_RXRDY | ATMCI_TXRDY
2174                                         | ATMCI_ENDRX | ATMCI_ENDTX
2175                                         | ATMCI_RXBUFF | ATMCI_TXBUFE);
2176 
2177                         host->data_status = status;
2178                         dev_dbg(&host->pdev->dev, "set pending data error\n");
2179                         smp_wmb();
2180                         atmci_set_pending(host, EVENT_DATA_ERROR);
2181                         tasklet_schedule(&host->tasklet);
2182                 }
2183 
2184                 if (pending & ATMCI_TXBUFE) {
2185                         dev_dbg(&host->pdev->dev, "IRQ: tx buffer empty\n");
2186                         atmci_writel(host, ATMCI_IDR, ATMCI_TXBUFE);
2187                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2188                         /*
2189                          * We can receive this interruption before having configured
2190                          * the second pdc buffer, so we need to reconfigure first and
2191                          * second buffers again
2192                          */
2193                         if (host->data_size) {
2194                                 atmci_pdc_set_both_buf(host, XFER_TRANSMIT);
2195                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2196                                 atmci_writel(host, ATMCI_IER, ATMCI_TXBUFE);
2197                         } else {
2198                                 atmci_pdc_complete(host);
2199                         }
2200                 } else if (pending & ATMCI_ENDTX) {
2201                         dev_dbg(&host->pdev->dev, "IRQ: end of tx buffer\n");
2202                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDTX);
2203 
2204                         if (host->data_size) {
2205                                 atmci_pdc_set_single_buf(host,
2206                                                 XFER_TRANSMIT, PDC_SECOND_BUF);
2207                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDTX);
2208                         }
2209                 }
2210 
2211                 if (pending & ATMCI_RXBUFF) {
2212                         dev_dbg(&host->pdev->dev, "IRQ: rx buffer full\n");
2213                         atmci_writel(host, ATMCI_IDR, ATMCI_RXBUFF);
2214                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2215                         /*
2216                          * We can receive this interruption before having configured
2217                          * the second pdc buffer, so we need to reconfigure first and
2218                          * second buffers again
2219                          */
2220                         if (host->data_size) {
2221                                 atmci_pdc_set_both_buf(host, XFER_RECEIVE);
2222                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2223                                 atmci_writel(host, ATMCI_IER, ATMCI_RXBUFF);
2224                         } else {
2225                                 atmci_pdc_complete(host);
2226                         }
2227                 } else if (pending & ATMCI_ENDRX) {
2228                         dev_dbg(&host->pdev->dev, "IRQ: end of rx buffer\n");
2229                         atmci_writel(host, ATMCI_IDR, ATMCI_ENDRX);
2230 
2231                         if (host->data_size) {
2232                                 atmci_pdc_set_single_buf(host,
2233                                                 XFER_RECEIVE, PDC_SECOND_BUF);
2234                                 atmci_writel(host, ATMCI_IER, ATMCI_ENDRX);
2235                         }
2236                 }
2237 
2238                 /*
2239                  * First mci IPs, so mainly the ones having pdc, have some
2240                  * issues with the notbusy signal. You can't get it after
2241                  * data transmission if you have not sent a stop command.
2242                  * The appropriate workaround is to use the BLKE signal.
2243                  */
2244                 if (pending & ATMCI_BLKE) {
2245                         dev_dbg(&host->pdev->dev, "IRQ: blke\n");
2246                         atmci_writel(host, ATMCI_IDR, ATMCI_BLKE);
2247                         smp_wmb();
2248                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2249                         atmci_set_pending(host, EVENT_NOTBUSY);
2250                         tasklet_schedule(&host->tasklet);
2251                 }
2252 
2253                 if (pending & ATMCI_NOTBUSY) {
2254                         dev_dbg(&host->pdev->dev, "IRQ: not_busy\n");
2255                         atmci_writel(host, ATMCI_IDR, ATMCI_NOTBUSY);
2256                         smp_wmb();
2257                         dev_dbg(&host->pdev->dev, "set pending notbusy\n");
2258                         atmci_set_pending(host, EVENT_NOTBUSY);
2259                         tasklet_schedule(&host->tasklet);
2260                 }
2261 
2262                 if (pending & ATMCI_RXRDY)
2263                         atmci_read_data_pio(host);
2264                 if (pending & ATMCI_TXRDY)
2265                         atmci_write_data_pio(host);
2266 
2267                 if (pending & ATMCI_CMDRDY) {
2268                         dev_dbg(&host->pdev->dev, "IRQ: cmd ready\n");
2269                         atmci_writel(host, ATMCI_IDR, ATMCI_CMDRDY);
2270                         host->cmd_status = status;
2271                         smp_wmb();
2272                         dev_dbg(&host->pdev->dev, "set pending cmd rdy\n");
2273                         atmci_set_pending(host, EVENT_CMD_RDY);
2274                         tasklet_schedule(&host->tasklet);
2275                 }
2276 
2277                 if (pending & (ATMCI_SDIOIRQA | ATMCI_SDIOIRQB))
2278                         atmci_sdio_interrupt(host, status);
2279 
2280         } while (pass_count++ < 5);
2281 
2282         return pass_count ? IRQ_HANDLED : IRQ_NONE;
2283 }
2284 
2285 static irqreturn_t atmci_detect_interrupt(int irq, void *dev_id)
2286 {
2287         struct atmel_mci_slot   *slot = dev_id;
2288 
2289         /*
2290          * Disable interrupts until the pin has stabilized and check
2291          * the state then. Use mod_timer() since we may be in the
2292          * middle of the timer routine when this interrupt triggers.
2293          */
2294         disable_irq_nosync(irq);
2295         mod_timer(&slot->detect_timer, jiffies + msecs_to_jiffies(20));
2296 
2297         return IRQ_HANDLED;
2298 }
2299 
2300 static int atmci_init_slot(struct atmel_mci *host,
2301                 struct mci_slot_pdata *slot_data, unsigned int id,
2302                 u32 sdc_reg, u32 sdio_irq)
2303 {
2304         struct mmc_host                 *mmc;
2305         struct atmel_mci_slot           *slot;
2306 
2307         mmc = mmc_alloc_host(sizeof(struct atmel_mci_slot), &host->pdev->dev);
2308         if (!mmc)
2309                 return -ENOMEM;
2310 
2311         slot = mmc_priv(mmc);
2312         slot->mmc = mmc;
2313         slot->host = host;
2314         slot->detect_pin = slot_data->detect_pin;
2315         slot->wp_pin = slot_data->wp_pin;
2316         slot->detect_is_active_high = slot_data->detect_is_active_high;
2317         slot->sdc_reg = sdc_reg;
2318         slot->sdio_irq = sdio_irq;
2319 
2320         dev_dbg(&mmc->class_dev,
2321                 "slot[%u]: bus_width=%u, detect_pin=%d, "
2322                 "detect_is_active_high=%s, wp_pin=%d\n",
2323                 id, slot_data->bus_width, slot_data->detect_pin,
2324                 slot_data->detect_is_active_high ? "true" : "false",
2325                 slot_data->wp_pin);
2326 
2327         mmc->ops = &atmci_ops;
2328         mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
2329         mmc->f_max = host->bus_hz / 2;
2330         mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
2331         if (sdio_irq)
2332                 mmc->caps |= MMC_CAP_SDIO_IRQ;
2333         if (host->caps.has_highspeed)
2334                 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
2335         /*
2336          * Without the read/write proof capability, it is strongly suggested to
2337          * use only one bit for data to prevent fifo underruns and overruns
2338          * which will corrupt data.
2339          */
2340         if ((slot_data->bus_width >= 4) && host->caps.has_rwproof)
2341                 mmc->caps |= MMC_CAP_4_BIT_DATA;
2342 
2343         if (atmci_get_version(host) < 0x200) {
2344                 mmc->max_segs = 256;
2345                 mmc->max_blk_size = 4095;
2346                 mmc->max_blk_count = 256;
2347                 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
2348                 mmc->max_seg_size = mmc->max_blk_size * mmc->max_segs;
2349         } else {
2350                 mmc->max_segs = 64;
2351                 mmc->max_req_size = 32768 * 512;
2352                 mmc->max_blk_size = 32768;
2353                 mmc->max_blk_count = 512;
2354         }
2355 
2356         /* Assume card is present initially */
2357         set_bit(ATMCI_CARD_PRESENT, &slot->flags);
2358         if (gpio_is_valid(slot->detect_pin)) {
2359                 if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
2360                                       "mmc_detect")) {
2361                         dev_dbg(&mmc->class_dev, "no detect pin available\n");
2362                         slot->detect_pin = -EBUSY;
2363                 } else if (gpio_get_value(slot->detect_pin) ^
2364                                 slot->detect_is_active_high) {
2365                         clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
2366                 }
2367         }
2368 
2369         if (!gpio_is_valid(slot->detect_pin)) {
2370                 if (slot_data->non_removable)
2371                         mmc->caps |= MMC_CAP_NONREMOVABLE;
2372                 else
2373                         mmc->caps |= MMC_CAP_NEEDS_POLL;
2374         }
2375 
2376         if (gpio_is_valid(slot->wp_pin)) {
2377                 if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
2378                                       "mmc_wp")) {
2379                         dev_dbg(&mmc->class_dev, "no WP pin available\n");
2380                         slot->wp_pin = -EBUSY;
2381                 }
2382         }
2383 
2384         host->slot[id] = slot;
2385         mmc_regulator_get_supply(mmc);
2386         mmc_add_host(mmc);
2387 
2388         if (gpio_is_valid(slot->detect_pin)) {
2389                 int ret;
2390 
2391                 setup_timer(&slot->detect_timer, atmci_detect_change,
2392                                 (unsigned long)slot);
2393 
2394                 ret = request_irq(gpio_to_irq(slot->detect_pin),
2395                                 atmci_detect_interrupt,
2396                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
2397                                 "mmc-detect", slot);
2398                 if (ret) {
2399                         dev_dbg(&mmc->class_dev,
2400                                 "could not request IRQ %d for detect pin\n",
2401                                 gpio_to_irq(slot->detect_pin));
2402                         slot->detect_pin = -EBUSY;
2403                 }
2404         }
2405 
2406         atmci_init_debugfs(slot);
2407 
2408         return 0;
2409 }
2410 
2411 static void atmci_cleanup_slot(struct atmel_mci_slot *slot,
2412                 unsigned int id)
2413 {
2414         /* Debugfs stuff is cleaned up by mmc core */
2415 
2416         set_bit(ATMCI_SHUTDOWN, &slot->flags);
2417         smp_wmb();
2418 
2419         mmc_remove_host(slot->mmc);
2420 
2421         if (gpio_is_valid(slot->detect_pin)) {
2422                 int pin = slot->detect_pin;
2423 
2424                 free_irq(gpio_to_irq(pin), slot);
2425                 del_timer_sync(&slot->detect_timer);
2426         }
2427 
2428         slot->host->slot[id] = NULL;
2429         mmc_free_host(slot->mmc);
2430 }
2431 
2432 static int atmci_configure_dma(struct atmel_mci *host)
2433 {
2434         host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev,
2435                                                         "rxtx");
2436 
2437         if (PTR_ERR(host->dma.chan) == -ENODEV) {
2438                 struct mci_platform_data *pdata = host->pdev->dev.platform_data;
2439                 dma_cap_mask_t mask;
2440 
2441                 if (!pdata || !pdata->dma_filter)
2442                         return -ENODEV;
2443 
2444                 dma_cap_zero(mask);
2445                 dma_cap_set(DMA_SLAVE, mask);
2446 
2447                 host->dma.chan = dma_request_channel(mask, pdata->dma_filter,
2448                                                      pdata->dma_slave);
2449                 if (!host->dma.chan)
2450                         host->dma.chan = ERR_PTR(-ENODEV);
2451         }
2452 
2453         if (IS_ERR(host->dma.chan))
2454                 return PTR_ERR(host->dma.chan);
2455 
2456         dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
2457                  dma_chan_name(host->dma.chan));
2458 
2459         host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
2460         host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2461         host->dma_conf.src_maxburst = 1;
2462         host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
2463         host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
2464         host->dma_conf.dst_maxburst = 1;
2465         host->dma_conf.device_fc = false;
2466 
2467         return 0;
2468 }
2469 
2470 /*
2471  * HSMCI (High Speed MCI) module is not fully compatible with MCI module.
2472  * HSMCI provides DMA support and a new config register but no more supports
2473  * PDC.
2474  */
2475 static void atmci_get_cap(struct atmel_mci *host)
2476 {
2477         unsigned int version;
2478 
2479         version = atmci_get_version(host);
2480         dev_info(&host->pdev->dev,
2481                         "version: 0x%x\n", version);
2482 
2483         host->caps.has_dma_conf_reg = 0;
2484         host->caps.has_pdc = ATMCI_PDC_CONNECTED;
2485         host->caps.has_cfg_reg = 0;
2486         host->caps.has_cstor_reg = 0;
2487         host->caps.has_highspeed = 0;
2488         host->caps.has_rwproof = 0;
2489         host->caps.has_odd_clk_div = 0;
2490         host->caps.has_bad_data_ordering = 1;
2491         host->caps.need_reset_after_xfer = 1;
2492         host->caps.need_blksz_mul_4 = 1;
2493         host->caps.need_notbusy_for_read_ops = 0;
2494 
2495         /* keep only major version number */
2496         switch (version & 0xf00) {
2497         case 0x600:
2498         case 0x500:
2499                 host->caps.has_odd_clk_div = 1;
2500         case 0x400:
2501         case 0x300:
2502                 host->caps.has_dma_conf_reg = 1;
2503                 host->caps.has_pdc = 0;
2504                 host->caps.has_cfg_reg = 1;
2505                 host->caps.has_cstor_reg = 1;
2506                 host->caps.has_highspeed = 1;
2507         case 0x200:
2508                 host->caps.has_rwproof = 1;
2509                 host->caps.need_blksz_mul_4 = 0;
2510                 host->caps.need_notbusy_for_read_ops = 1;
2511         case 0x100:
2512                 host->caps.has_bad_data_ordering = 0;
2513                 host->caps.need_reset_after_xfer = 0;
2514         case 0x0:
2515                 break;
2516         default:
2517                 host->caps.has_pdc = 0;
2518                 dev_warn(&host->pdev->dev,
2519                                 "Unmanaged mci version, set minimum capabilities\n");
2520                 break;
2521         }
2522 }
2523 
2524 static int atmci_probe(struct platform_device *pdev)
2525 {
2526         struct mci_platform_data        *pdata;
2527         struct atmel_mci                *host;
2528         struct resource                 *regs;
2529         unsigned int                    nr_slots;
2530         int                             irq;
2531         int                             ret, i;
2532 
2533         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2534         if (!regs)
2535                 return -ENXIO;
2536         pdata = pdev->dev.platform_data;
2537         if (!pdata) {
2538                 pdata = atmci_of_init(pdev);
2539                 if (IS_ERR(pdata)) {
2540                         dev_err(&pdev->dev, "platform data not available\n");
2541                         return PTR_ERR(pdata);
2542                 }
2543         }
2544 
2545         irq = platform_get_irq(pdev, 0);
2546         if (irq < 0)
2547                 return irq;
2548 
2549         host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
2550         if (!host)
2551                 return -ENOMEM;
2552 
2553         host->pdev = pdev;
2554         spin_lock_init(&host->lock);
2555         INIT_LIST_HEAD(&host->queue);
2556 
2557         host->mck = devm_clk_get(&pdev->dev, "mci_clk");
2558         if (IS_ERR(host->mck))
2559                 return PTR_ERR(host->mck);
2560 
2561         host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
2562         if (!host->regs)
2563                 return -ENOMEM;
2564 
2565         ret = clk_prepare_enable(host->mck);
2566         if (ret)
2567                 return ret;
2568 
2569         atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
2570         host->bus_hz = clk_get_rate(host->mck);
2571 
2572         host->mapbase = regs->start;
2573 
2574         tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
2575 
2576         ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
2577         if (ret) {
2578                 clk_disable_unprepare(host->mck);
2579                 return ret;
2580         }
2581 
2582         /* Get MCI capabilities and set operations according to it */
2583         atmci_get_cap(host);
2584         ret = atmci_configure_dma(host);
2585         if (ret == -EPROBE_DEFER)
2586                 goto err_dma_probe_defer;
2587         if (ret == 0) {
2588                 host->prepare_data = &atmci_prepare_data_dma;
2589                 host->submit_data = &atmci_submit_data_dma;
2590                 host->stop_transfer = &atmci_stop_transfer_dma;
2591         } else if (host->caps.has_pdc) {
2592                 dev_info(&pdev->dev, "using PDC\n");
2593                 host->prepare_data = &atmci_prepare_data_pdc;
2594                 host->submit_data = &atmci_submit_data_pdc;
2595                 host->stop_transfer = &atmci_stop_transfer_pdc;
2596         } else {
2597                 dev_info(&pdev->dev, "using PIO\n");
2598                 host->prepare_data = &atmci_prepare_data;
2599                 host->submit_data = &atmci_submit_data;
2600                 host->stop_transfer = &atmci_stop_transfer;
2601         }
2602 
2603         platform_set_drvdata(pdev, host);
2604 
2605         setup_timer(&host->timer, atmci_timeout_timer, (unsigned long)host);
2606 
2607         pm_runtime_get_noresume(&pdev->dev);
2608         pm_runtime_set_active(&pdev->dev);
2609         pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_DELAY);
2610         pm_runtime_use_autosuspend(&pdev->dev);
2611         pm_runtime_enable(&pdev->dev);
2612 
2613         /* We need at least one slot to succeed */
2614         nr_slots = 0;
2615         ret = -ENODEV;
2616         if (pdata->slot[0].bus_width) {
2617                 ret = atmci_init_slot(host, &pdata->slot[0],
2618                                 0, ATMCI_SDCSEL_SLOT_A, ATMCI_SDIOIRQA);
2619                 if (!ret) {
2620                         nr_slots++;
2621                         host->buf_size = host->slot[0]->mmc->max_req_size;
2622                 }
2623         }
2624         if (pdata->slot[1].bus_width) {
2625                 ret = atmci_init_slot(host, &pdata->slot[1],
2626                                 1, ATMCI_SDCSEL_SLOT_B, ATMCI_SDIOIRQB);
2627                 if (!ret) {
2628                         nr_slots++;
2629                         if (host->slot[1]->mmc->max_req_size > host->buf_size)
2630                                 host->buf_size =
2631                                         host->slot[1]->mmc->max_req_size;
2632                 }
2633         }
2634 
2635         if (!nr_slots) {
2636                 dev_err(&pdev->dev, "init failed: no slot defined\n");
2637                 goto err_init_slot;
2638         }
2639 
2640         if (!host->caps.has_rwproof) {
2641                 host->buffer = dma_alloc_coherent(&pdev->dev, host->buf_size,
2642                                                   &host->buf_phys_addr,
2643                                                   GFP_KERNEL);
2644                 if (!host->buffer) {
2645                         ret = -ENOMEM;
2646                         dev_err(&pdev->dev, "buffer allocation failed\n");
2647                         goto err_dma_alloc;
2648                 }
2649         }
2650 
2651         dev_info(&pdev->dev,
2652                         "Atmel MCI controller at 0x%08lx irq %d, %u slots\n",
2653                         host->mapbase, irq, nr_slots);
2654 
2655         pm_runtime_mark_last_busy(&host->pdev->dev);
2656         pm_runtime_put_autosuspend(&pdev->dev);
2657 
2658         return 0;
2659 
2660 err_dma_alloc:
2661         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2662                 if (host->slot[i])
2663                         atmci_cleanup_slot(host->slot[i], i);
2664         }
2665 err_init_slot:
2666         clk_disable_unprepare(host->mck);
2667 
2668         pm_runtime_disable(&pdev->dev);
2669         pm_runtime_put_noidle(&pdev->dev);
2670 
2671         del_timer_sync(&host->timer);
2672         if (!IS_ERR(host->dma.chan))
2673                 dma_release_channel(host->dma.chan);
2674 err_dma_probe_defer:
2675         free_irq(irq, host);
2676         return ret;
2677 }
2678 
2679 static int atmci_remove(struct platform_device *pdev)
2680 {
2681         struct atmel_mci        *host = platform_get_drvdata(pdev);
2682         unsigned int            i;
2683 
2684         pm_runtime_get_sync(&pdev->dev);
2685 
2686         if (host->buffer)
2687                 dma_free_coherent(&pdev->dev, host->buf_size,
2688                                   host->buffer, host->buf_phys_addr);
2689 
2690         for (i = 0; i < ATMCI_MAX_NR_SLOTS; i++) {
2691                 if (host->slot[i])
2692                         atmci_cleanup_slot(host->slot[i], i);
2693         }
2694 
2695         atmci_writel(host, ATMCI_IDR, ~0UL);
2696         atmci_writel(host, ATMCI_CR, ATMCI_CR_MCIDIS);
2697         atmci_readl(host, ATMCI_SR);
2698 
2699         del_timer_sync(&host->timer);
2700         if (!IS_ERR(host->dma.chan))
2701                 dma_release_channel(host->dma.chan);
2702 
2703         free_irq(platform_get_irq(pdev, 0), host);
2704 
2705         clk_disable_unprepare(host->mck);
2706 
2707         pm_runtime_disable(&pdev->dev);
2708         pm_runtime_put_noidle(&pdev->dev);
2709 
2710         return 0;
2711 }
2712 
2713 #ifdef CONFIG_PM
2714 static int atmci_runtime_suspend(struct device *dev)
2715 {
2716         struct atmel_mci *host = dev_get_drvdata(dev);
2717 
2718         clk_disable_unprepare(host->mck);
2719 
2720         pinctrl_pm_select_sleep_state(dev);
2721 
2722         return 0;
2723 }
2724 
2725 static int atmci_runtime_resume(struct device *dev)
2726 {
2727         struct atmel_mci *host = dev_get_drvdata(dev);
2728 
2729         pinctrl_pm_select_default_state(dev);
2730 
2731         return clk_prepare_enable(host->mck);
2732 }
2733 #endif
2734 
2735 static const struct dev_pm_ops atmci_dev_pm_ops = {
2736         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2737                                 pm_runtime_force_resume)
2738         SET_RUNTIME_PM_OPS(atmci_runtime_suspend, atmci_runtime_resume, NULL)
2739 };
2740 
2741 static struct platform_driver atmci_driver = {
2742         .probe          = atmci_probe,
2743         .remove         = atmci_remove,
2744         .driver         = {
2745                 .name           = "atmel_mci",
2746                 .of_match_table = of_match_ptr(atmci_dt_ids),
2747                 .pm             = &atmci_dev_pm_ops,
2748         },
2749 };
2750 module_platform_driver(atmci_driver);
2751 
2752 MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");
2753 MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
2754 MODULE_LICENSE("GPL v2");
2755 

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