Version:  2.0.40 2.2.26 2.4.37 3.8 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

Linux/drivers/spi/spi-bcm63xx.c

  1 /*
  2  * Broadcom BCM63xx SPI controller support
  3  *
  4  * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org>
  5  * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * as published by the Free Software Foundation; either version 2
 10  * of the License, or (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  */
 17 
 18 #include <linux/kernel.h>
 19 #include <linux/clk.h>
 20 #include <linux/io.h>
 21 #include <linux/module.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/delay.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/spi/spi.h>
 26 #include <linux/completion.h>
 27 #include <linux/err.h>
 28 #include <linux/pm_runtime.h>
 29 
 30 /* BCM 6338/6348 SPI core */
 31 #define SPI_6348_RSET_SIZE              64
 32 #define SPI_6348_CMD                    0x00    /* 16-bits register */
 33 #define SPI_6348_INT_STATUS             0x02
 34 #define SPI_6348_INT_MASK_ST            0x03
 35 #define SPI_6348_INT_MASK               0x04
 36 #define SPI_6348_ST                     0x05
 37 #define SPI_6348_CLK_CFG                0x06
 38 #define SPI_6348_FILL_BYTE              0x07
 39 #define SPI_6348_MSG_TAIL               0x09
 40 #define SPI_6348_RX_TAIL                0x0b
 41 #define SPI_6348_MSG_CTL                0x40    /* 8-bits register */
 42 #define SPI_6348_MSG_CTL_WIDTH          8
 43 #define SPI_6348_MSG_DATA               0x41
 44 #define SPI_6348_MSG_DATA_SIZE          0x3f
 45 #define SPI_6348_RX_DATA                0x80
 46 #define SPI_6348_RX_DATA_SIZE           0x3f
 47 
 48 /* BCM 3368/6358/6262/6368 SPI core */
 49 #define SPI_6358_RSET_SIZE              1804
 50 #define SPI_6358_MSG_CTL                0x00    /* 16-bits register */
 51 #define SPI_6358_MSG_CTL_WIDTH          16
 52 #define SPI_6358_MSG_DATA               0x02
 53 #define SPI_6358_MSG_DATA_SIZE          0x21e
 54 #define SPI_6358_RX_DATA                0x400
 55 #define SPI_6358_RX_DATA_SIZE           0x220
 56 #define SPI_6358_CMD                    0x700   /* 16-bits register */
 57 #define SPI_6358_INT_STATUS             0x702
 58 #define SPI_6358_INT_MASK_ST            0x703
 59 #define SPI_6358_INT_MASK               0x704
 60 #define SPI_6358_ST                     0x705
 61 #define SPI_6358_CLK_CFG                0x706
 62 #define SPI_6358_FILL_BYTE              0x707
 63 #define SPI_6358_MSG_TAIL               0x709
 64 #define SPI_6358_RX_TAIL                0x70B
 65 
 66 /* Shared SPI definitions */
 67 
 68 /* Message configuration */
 69 #define SPI_FD_RW                       0x00
 70 #define SPI_HD_W                        0x01
 71 #define SPI_HD_R                        0x02
 72 #define SPI_BYTE_CNT_SHIFT              0
 73 #define SPI_6348_MSG_TYPE_SHIFT         6
 74 #define SPI_6358_MSG_TYPE_SHIFT         14
 75 
 76 /* Command */
 77 #define SPI_CMD_NOOP                    0x00
 78 #define SPI_CMD_SOFT_RESET              0x01
 79 #define SPI_CMD_HARD_RESET              0x02
 80 #define SPI_CMD_START_IMMEDIATE         0x03
 81 #define SPI_CMD_COMMAND_SHIFT           0
 82 #define SPI_CMD_COMMAND_MASK            0x000f
 83 #define SPI_CMD_DEVICE_ID_SHIFT         4
 84 #define SPI_CMD_PREPEND_BYTE_CNT_SHIFT  8
 85 #define SPI_CMD_ONE_BYTE_SHIFT          11
 86 #define SPI_CMD_ONE_WIRE_SHIFT          12
 87 #define SPI_DEV_ID_0                    0
 88 #define SPI_DEV_ID_1                    1
 89 #define SPI_DEV_ID_2                    2
 90 #define SPI_DEV_ID_3                    3
 91 
 92 /* Interrupt mask */
 93 #define SPI_INTR_CMD_DONE               0x01
 94 #define SPI_INTR_RX_OVERFLOW            0x02
 95 #define SPI_INTR_TX_UNDERFLOW           0x04
 96 #define SPI_INTR_TX_OVERFLOW            0x08
 97 #define SPI_INTR_RX_UNDERFLOW           0x10
 98 #define SPI_INTR_CLEAR_ALL              0x1f
 99 
100 /* Status */
101 #define SPI_RX_EMPTY                    0x02
102 #define SPI_CMD_BUSY                    0x04
103 #define SPI_SERIAL_BUSY                 0x08
104 
105 /* Clock configuration */
106 #define SPI_CLK_20MHZ                   0x00
107 #define SPI_CLK_0_391MHZ                0x01
108 #define SPI_CLK_0_781MHZ                0x02    /* default */
109 #define SPI_CLK_1_563MHZ                0x03
110 #define SPI_CLK_3_125MHZ                0x04
111 #define SPI_CLK_6_250MHZ                0x05
112 #define SPI_CLK_12_50MHZ                0x06
113 #define SPI_CLK_MASK                    0x07
114 #define SPI_SSOFFTIME_MASK              0x38
115 #define SPI_SSOFFTIME_SHIFT             3
116 #define SPI_BYTE_SWAP                   0x80
117 
118 enum bcm63xx_regs_spi {
119         SPI_CMD,
120         SPI_INT_STATUS,
121         SPI_INT_MASK_ST,
122         SPI_INT_MASK,
123         SPI_ST,
124         SPI_CLK_CFG,
125         SPI_FILL_BYTE,
126         SPI_MSG_TAIL,
127         SPI_RX_TAIL,
128         SPI_MSG_CTL,
129         SPI_MSG_DATA,
130         SPI_RX_DATA,
131         SPI_MSG_TYPE_SHIFT,
132         SPI_MSG_CTL_WIDTH,
133         SPI_MSG_DATA_SIZE,
134 };
135 
136 #define BCM63XX_SPI_MAX_PREPEND         15
137 
138 #define BCM63XX_SPI_MAX_CS              8
139 #define BCM63XX_SPI_BUS_NUM             0
140 
141 struct bcm63xx_spi {
142         struct completion       done;
143 
144         void __iomem            *regs;
145         int                     irq;
146 
147         /* Platform data */
148         const unsigned long     *reg_offsets;
149         unsigned                fifo_size;
150         unsigned int            msg_type_shift;
151         unsigned int            msg_ctl_width;
152 
153         /* data iomem */
154         u8 __iomem              *tx_io;
155         const u8 __iomem        *rx_io;
156 
157         struct clk              *clk;
158         struct platform_device  *pdev;
159 };
160 
161 static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs,
162                                unsigned int offset)
163 {
164         return readb(bs->regs + bs->reg_offsets[offset]);
165 }
166 
167 static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs,
168                                 unsigned int offset)
169 {
170 #ifdef CONFIG_CPU_BIG_ENDIAN
171         return ioread16be(bs->regs + bs->reg_offsets[offset]);
172 #else
173         return readw(bs->regs + bs->reg_offsets[offset]);
174 #endif
175 }
176 
177 static inline void bcm_spi_writeb(struct bcm63xx_spi *bs,
178                                   u8 value, unsigned int offset)
179 {
180         writeb(value, bs->regs + bs->reg_offsets[offset]);
181 }
182 
183 static inline void bcm_spi_writew(struct bcm63xx_spi *bs,
184                                   u16 value, unsigned int offset)
185 {
186 #ifdef CONFIG_CPU_BIG_ENDIAN
187         iowrite16be(value, bs->regs + bs->reg_offsets[offset]);
188 #else
189         writew(value, bs->regs + bs->reg_offsets[offset]);
190 #endif
191 }
192 
193 static const unsigned bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = {
194         { 20000000, SPI_CLK_20MHZ },
195         { 12500000, SPI_CLK_12_50MHZ },
196         {  6250000, SPI_CLK_6_250MHZ },
197         {  3125000, SPI_CLK_3_125MHZ },
198         {  1563000, SPI_CLK_1_563MHZ },
199         {   781000, SPI_CLK_0_781MHZ },
200         {   391000, SPI_CLK_0_391MHZ }
201 };
202 
203 static void bcm63xx_spi_setup_transfer(struct spi_device *spi,
204                                       struct spi_transfer *t)
205 {
206         struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
207         u8 clk_cfg, reg;
208         int i;
209 
210         /* Find the closest clock configuration */
211         for (i = 0; i < SPI_CLK_MASK; i++) {
212                 if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) {
213                         clk_cfg = bcm63xx_spi_freq_table[i][1];
214                         break;
215                 }
216         }
217 
218         /* No matching configuration found, default to lowest */
219         if (i == SPI_CLK_MASK)
220                 clk_cfg = SPI_CLK_0_391MHZ;
221 
222         /* clear existing clock configuration bits of the register */
223         reg = bcm_spi_readb(bs, SPI_CLK_CFG);
224         reg &= ~SPI_CLK_MASK;
225         reg |= clk_cfg;
226 
227         bcm_spi_writeb(bs, reg, SPI_CLK_CFG);
228         dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n",
229                 clk_cfg, t->speed_hz);
230 }
231 
232 /* the spi->mode bits understood by this driver: */
233 #define MODEBITS (SPI_CPOL | SPI_CPHA)
234 
235 static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first,
236                                 unsigned int num_transfers)
237 {
238         struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
239         u16 msg_ctl;
240         u16 cmd;
241         unsigned int i, timeout = 0, prepend_len = 0, len = 0;
242         struct spi_transfer *t = first;
243         bool do_rx = false;
244         bool do_tx = false;
245 
246         /* Disable the CMD_DONE interrupt */
247         bcm_spi_writeb(bs, 0, SPI_INT_MASK);
248 
249         dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
250                 t->tx_buf, t->rx_buf, t->len);
251 
252         if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND)
253                 prepend_len = t->len;
254 
255         /* prepare the buffer */
256         for (i = 0; i < num_transfers; i++) {
257                 if (t->tx_buf) {
258                         do_tx = true;
259                         memcpy_toio(bs->tx_io + len, t->tx_buf, t->len);
260 
261                         /* don't prepend more than one tx */
262                         if (t != first)
263                                 prepend_len = 0;
264                 }
265 
266                 if (t->rx_buf) {
267                         do_rx = true;
268                         /* prepend is half-duplex write only */
269                         if (t == first)
270                                 prepend_len = 0;
271                 }
272 
273                 len += t->len;
274 
275                 t = list_entry(t->transfer_list.next, struct spi_transfer,
276                                transfer_list);
277         }
278 
279         reinit_completion(&bs->done);
280 
281         /* Fill in the Message control register */
282         msg_ctl = (len << SPI_BYTE_CNT_SHIFT);
283 
284         if (do_rx && do_tx && prepend_len == 0)
285                 msg_ctl |= (SPI_FD_RW << bs->msg_type_shift);
286         else if (do_rx)
287                 msg_ctl |= (SPI_HD_R << bs->msg_type_shift);
288         else if (do_tx)
289                 msg_ctl |= (SPI_HD_W << bs->msg_type_shift);
290 
291         switch (bs->msg_ctl_width) {
292         case 8:
293                 bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL);
294                 break;
295         case 16:
296                 bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL);
297                 break;
298         }
299 
300         /* Issue the transfer */
301         cmd = SPI_CMD_START_IMMEDIATE;
302         cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
303         cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT);
304         bcm_spi_writew(bs, cmd, SPI_CMD);
305 
306         /* Enable the CMD_DONE interrupt */
307         bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
308 
309         timeout = wait_for_completion_timeout(&bs->done, HZ);
310         if (!timeout)
311                 return -ETIMEDOUT;
312 
313         if (!do_rx)
314                 return 0;
315 
316         len = 0;
317         t = first;
318         /* Read out all the data */
319         for (i = 0; i < num_transfers; i++) {
320                 if (t->rx_buf)
321                         memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len);
322 
323                 if (t != first || prepend_len == 0)
324                         len += t->len;
325 
326                 t = list_entry(t->transfer_list.next, struct spi_transfer,
327                                transfer_list);
328         }
329 
330         return 0;
331 }
332 
333 static int bcm63xx_spi_transfer_one(struct spi_master *master,
334                                         struct spi_message *m)
335 {
336         struct bcm63xx_spi *bs = spi_master_get_devdata(master);
337         struct spi_transfer *t, *first = NULL;
338         struct spi_device *spi = m->spi;
339         int status = 0;
340         unsigned int n_transfers = 0, total_len = 0;
341         bool can_use_prepend = false;
342 
343         /*
344          * This SPI controller does not support keeping CS active after a
345          * transfer.
346          * Work around this by merging as many transfers we can into one big
347          * full-duplex transfers.
348          */
349         list_for_each_entry(t, &m->transfers, transfer_list) {
350                 if (!first)
351                         first = t;
352 
353                 n_transfers++;
354                 total_len += t->len;
355 
356                 if (n_transfers == 2 && !first->rx_buf && !t->tx_buf &&
357                     first->len <= BCM63XX_SPI_MAX_PREPEND)
358                         can_use_prepend = true;
359                 else if (can_use_prepend && t->tx_buf)
360                         can_use_prepend = false;
361 
362                 /* we can only transfer one fifo worth of data */
363                 if ((can_use_prepend &&
364                      total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) ||
365                     (!can_use_prepend && total_len > bs->fifo_size)) {
366                         dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n",
367                                 total_len, bs->fifo_size);
368                         status = -EINVAL;
369                         goto exit;
370                 }
371 
372                 /* all combined transfers have to have the same speed */
373                 if (t->speed_hz != first->speed_hz) {
374                         dev_err(&spi->dev, "unable to change speed between transfers\n");
375                         status = -EINVAL;
376                         goto exit;
377                 }
378 
379                 /* CS will be deasserted directly after transfer */
380                 if (t->delay_usecs) {
381                         dev_err(&spi->dev, "unable to keep CS asserted after transfer\n");
382                         status = -EINVAL;
383                         goto exit;
384                 }
385 
386                 if (t->cs_change ||
387                     list_is_last(&t->transfer_list, &m->transfers)) {
388                         /* configure adapter for a new transfer */
389                         bcm63xx_spi_setup_transfer(spi, first);
390 
391                         /* send the data */
392                         status = bcm63xx_txrx_bufs(spi, first, n_transfers);
393                         if (status)
394                                 goto exit;
395 
396                         m->actual_length += total_len;
397 
398                         first = NULL;
399                         n_transfers = 0;
400                         total_len = 0;
401                         can_use_prepend = false;
402                 }
403         }
404 exit:
405         m->status = status;
406         spi_finalize_current_message(master);
407 
408         return 0;
409 }
410 
411 /* This driver supports single master mode only. Hence
412  * CMD_DONE is the only interrupt we care about
413  */
414 static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id)
415 {
416         struct spi_master *master = (struct spi_master *)dev_id;
417         struct bcm63xx_spi *bs = spi_master_get_devdata(master);
418         u8 intr;
419 
420         /* Read interupts and clear them immediately */
421         intr = bcm_spi_readb(bs, SPI_INT_STATUS);
422         bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
423         bcm_spi_writeb(bs, 0, SPI_INT_MASK);
424 
425         /* A transfer completed */
426         if (intr & SPI_INTR_CMD_DONE)
427                 complete(&bs->done);
428 
429         return IRQ_HANDLED;
430 }
431 
432 static const unsigned long bcm6348_spi_reg_offsets[] = {
433         [SPI_CMD]               = SPI_6348_CMD,
434         [SPI_INT_STATUS]        = SPI_6348_INT_STATUS,
435         [SPI_INT_MASK_ST]       = SPI_6348_INT_MASK_ST,
436         [SPI_INT_MASK]          = SPI_6348_INT_MASK,
437         [SPI_ST]                = SPI_6348_ST,
438         [SPI_CLK_CFG]           = SPI_6348_CLK_CFG,
439         [SPI_FILL_BYTE]         = SPI_6348_FILL_BYTE,
440         [SPI_MSG_TAIL]          = SPI_6348_MSG_TAIL,
441         [SPI_RX_TAIL]           = SPI_6348_RX_TAIL,
442         [SPI_MSG_CTL]           = SPI_6348_MSG_CTL,
443         [SPI_MSG_DATA]          = SPI_6348_MSG_DATA,
444         [SPI_RX_DATA]           = SPI_6348_RX_DATA,
445         [SPI_MSG_TYPE_SHIFT]    = SPI_6348_MSG_TYPE_SHIFT,
446         [SPI_MSG_CTL_WIDTH]     = SPI_6348_MSG_CTL_WIDTH,
447         [SPI_MSG_DATA_SIZE]     = SPI_6348_MSG_DATA_SIZE,
448 };
449 
450 static const unsigned long bcm6358_spi_reg_offsets[] = {
451         [SPI_CMD]               = SPI_6358_CMD,
452         [SPI_INT_STATUS]        = SPI_6358_INT_STATUS,
453         [SPI_INT_MASK_ST]       = SPI_6358_INT_MASK_ST,
454         [SPI_INT_MASK]          = SPI_6358_INT_MASK,
455         [SPI_ST]                = SPI_6358_ST,
456         [SPI_CLK_CFG]           = SPI_6358_CLK_CFG,
457         [SPI_FILL_BYTE]         = SPI_6358_FILL_BYTE,
458         [SPI_MSG_TAIL]          = SPI_6358_MSG_TAIL,
459         [SPI_RX_TAIL]           = SPI_6358_RX_TAIL,
460         [SPI_MSG_CTL]           = SPI_6358_MSG_CTL,
461         [SPI_MSG_DATA]          = SPI_6358_MSG_DATA,
462         [SPI_RX_DATA]           = SPI_6358_RX_DATA,
463         [SPI_MSG_TYPE_SHIFT]    = SPI_6358_MSG_TYPE_SHIFT,
464         [SPI_MSG_CTL_WIDTH]     = SPI_6358_MSG_CTL_WIDTH,
465         [SPI_MSG_DATA_SIZE]     = SPI_6358_MSG_DATA_SIZE,
466 };
467 
468 static const struct platform_device_id bcm63xx_spi_dev_match[] = {
469         {
470                 .name = "bcm6348-spi",
471                 .driver_data = (unsigned long)bcm6348_spi_reg_offsets,
472         },
473         {
474                 .name = "bcm6358-spi",
475                 .driver_data = (unsigned long)bcm6358_spi_reg_offsets,
476         },
477         {
478         },
479 };
480 
481 static int bcm63xx_spi_probe(struct platform_device *pdev)
482 {
483         struct resource *r;
484         const unsigned long *bcm63xx_spireg;
485         struct device *dev = &pdev->dev;
486         int irq;
487         struct spi_master *master;
488         struct clk *clk;
489         struct bcm63xx_spi *bs;
490         int ret;
491 
492         if (!pdev->id_entry->driver_data)
493                 return -EINVAL;
494 
495         bcm63xx_spireg = (const unsigned long *)pdev->id_entry->driver_data;
496 
497         irq = platform_get_irq(pdev, 0);
498         if (irq < 0) {
499                 dev_err(dev, "no irq\n");
500                 return -ENXIO;
501         }
502 
503         clk = devm_clk_get(dev, "spi");
504         if (IS_ERR(clk)) {
505                 dev_err(dev, "no clock for device\n");
506                 return PTR_ERR(clk);
507         }
508 
509         master = spi_alloc_master(dev, sizeof(*bs));
510         if (!master) {
511                 dev_err(dev, "out of memory\n");
512                 return -ENOMEM;
513         }
514 
515         bs = spi_master_get_devdata(master);
516         init_completion(&bs->done);
517 
518         platform_set_drvdata(pdev, master);
519         bs->pdev = pdev;
520 
521         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
522         bs->regs = devm_ioremap_resource(&pdev->dev, r);
523         if (IS_ERR(bs->regs)) {
524                 ret = PTR_ERR(bs->regs);
525                 goto out_err;
526         }
527 
528         bs->irq = irq;
529         bs->clk = clk;
530         bs->reg_offsets = bcm63xx_spireg;
531         bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE];
532 
533         ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0,
534                                                         pdev->name, master);
535         if (ret) {
536                 dev_err(dev, "unable to request irq\n");
537                 goto out_err;
538         }
539 
540         master->bus_num = BCM63XX_SPI_BUS_NUM;
541         master->num_chipselect = BCM63XX_SPI_MAX_CS;
542         master->transfer_one_message = bcm63xx_spi_transfer_one;
543         master->mode_bits = MODEBITS;
544         master->bits_per_word_mask = SPI_BPW_MASK(8);
545         master->auto_runtime_pm = true;
546         bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT];
547         bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH];
548         bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]);
549         bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]);
550 
551         /* Initialize hardware */
552         ret = clk_prepare_enable(bs->clk);
553         if (ret)
554                 goto out_err;
555 
556         bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
557 
558         /* register and we are done */
559         ret = devm_spi_register_master(dev, master);
560         if (ret) {
561                 dev_err(dev, "spi register failed\n");
562                 goto out_clk_disable;
563         }
564 
565         dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n",
566                  r, irq, bs->fifo_size);
567 
568         return 0;
569 
570 out_clk_disable:
571         clk_disable_unprepare(clk);
572 out_err:
573         spi_master_put(master);
574         return ret;
575 }
576 
577 static int bcm63xx_spi_remove(struct platform_device *pdev)
578 {
579         struct spi_master *master = platform_get_drvdata(pdev);
580         struct bcm63xx_spi *bs = spi_master_get_devdata(master);
581 
582         /* reset spi block */
583         bcm_spi_writeb(bs, 0, SPI_INT_MASK);
584 
585         /* HW shutdown */
586         clk_disable_unprepare(bs->clk);
587 
588         return 0;
589 }
590 
591 #ifdef CONFIG_PM_SLEEP
592 static int bcm63xx_spi_suspend(struct device *dev)
593 {
594         struct spi_master *master = dev_get_drvdata(dev);
595         struct bcm63xx_spi *bs = spi_master_get_devdata(master);
596 
597         spi_master_suspend(master);
598 
599         clk_disable_unprepare(bs->clk);
600 
601         return 0;
602 }
603 
604 static int bcm63xx_spi_resume(struct device *dev)
605 {
606         struct spi_master *master = dev_get_drvdata(dev);
607         struct bcm63xx_spi *bs = spi_master_get_devdata(master);
608         int ret;
609 
610         ret = clk_prepare_enable(bs->clk);
611         if (ret)
612                 return ret;
613 
614         spi_master_resume(master);
615 
616         return 0;
617 }
618 #endif
619 
620 static const struct dev_pm_ops bcm63xx_spi_pm_ops = {
621         SET_SYSTEM_SLEEP_PM_OPS(bcm63xx_spi_suspend, bcm63xx_spi_resume)
622 };
623 
624 static struct platform_driver bcm63xx_spi_driver = {
625         .driver = {
626                 .name   = "bcm63xx-spi",
627                 .pm     = &bcm63xx_spi_pm_ops,
628         },
629         .id_table       = bcm63xx_spi_dev_match,
630         .probe          = bcm63xx_spi_probe,
631         .remove         = bcm63xx_spi_remove,
632 };
633 
634 module_platform_driver(bcm63xx_spi_driver);
635 
636 MODULE_ALIAS("platform:bcm63xx_spi");
637 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
638 MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>");
639 MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver");
640 MODULE_LICENSE("GPL");
641 

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