Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/net/irda/pxaficp_ir.c

  1 /*
  2  * linux/drivers/net/irda/pxaficp_ir.c
  3  *
  4  * Based on sa1100_ir.c by Russell King
  5  *
  6  * Changes copyright (C) 2003-2005 MontaVista Software, Inc.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  *
 12  * Infra-red driver (SIR/FIR) for the PXA2xx embedded microprocessor
 13  *
 14  */
 15 #include <linux/dma-mapping.h>
 16 #include <linux/interrupt.h>
 17 #include <linux/module.h>
 18 #include <linux/netdevice.h>
 19 #include <linux/etherdevice.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/clk.h>
 22 #include <linux/gpio.h>
 23 #include <linux/slab.h>
 24 
 25 #include <net/irda/irda.h>
 26 #include <net/irda/irmod.h>
 27 #include <net/irda/wrapper.h>
 28 #include <net/irda/irda_device.h>
 29 
 30 #include <mach/dma.h>
 31 #include <linux/platform_data/irda-pxaficp.h>
 32 #include <mach/regs-ost.h>
 33 #include <mach/regs-uart.h>
 34 
 35 #define FICP            __REG(0x40800000)  /* Start of FICP area */
 36 #define ICCR0           __REG(0x40800000)  /* ICP Control Register 0 */
 37 #define ICCR1           __REG(0x40800004)  /* ICP Control Register 1 */
 38 #define ICCR2           __REG(0x40800008)  /* ICP Control Register 2 */
 39 #define ICDR            __REG(0x4080000c)  /* ICP Data Register */
 40 #define ICSR0           __REG(0x40800014)  /* ICP Status Register 0 */
 41 #define ICSR1           __REG(0x40800018)  /* ICP Status Register 1 */
 42 
 43 #define ICCR0_AME       (1 << 7)        /* Address match enable */
 44 #define ICCR0_TIE       (1 << 6)        /* Transmit FIFO interrupt enable */
 45 #define ICCR0_RIE       (1 << 5)        /* Receive FIFO interrupt enable */
 46 #define ICCR0_RXE       (1 << 4)        /* Receive enable */
 47 #define ICCR0_TXE       (1 << 3)        /* Transmit enable */
 48 #define ICCR0_TUS       (1 << 2)        /* Transmit FIFO underrun select */
 49 #define ICCR0_LBM       (1 << 1)        /* Loopback mode */
 50 #define ICCR0_ITR       (1 << 0)        /* IrDA transmission */
 51 
 52 #define ICCR2_RXP       (1 << 3)        /* Receive Pin Polarity select */
 53 #define ICCR2_TXP       (1 << 2)        /* Transmit Pin Polarity select */
 54 #define ICCR2_TRIG      (3 << 0)        /* Receive FIFO Trigger threshold */
 55 #define ICCR2_TRIG_8    (0 << 0)        /*      >= 8 bytes */
 56 #define ICCR2_TRIG_16   (1 << 0)        /*      >= 16 bytes */
 57 #define ICCR2_TRIG_32   (2 << 0)        /*      >= 32 bytes */
 58 
 59 #ifdef CONFIG_PXA27x
 60 #define ICSR0_EOC       (1 << 6)        /* DMA End of Descriptor Chain */
 61 #endif
 62 #define ICSR0_FRE       (1 << 5)        /* Framing error */
 63 #define ICSR0_RFS       (1 << 4)        /* Receive FIFO service request */
 64 #define ICSR0_TFS       (1 << 3)        /* Transnit FIFO service request */
 65 #define ICSR0_RAB       (1 << 2)        /* Receiver abort */
 66 #define ICSR0_TUR       (1 << 1)        /* Trunsmit FIFO underun */
 67 #define ICSR0_EIF       (1 << 0)        /* End/Error in FIFO */
 68 
 69 #define ICSR1_ROR       (1 << 6)        /* Receiver FIFO underrun  */
 70 #define ICSR1_CRE       (1 << 5)        /* CRC error */
 71 #define ICSR1_EOF       (1 << 4)        /* End of frame */
 72 #define ICSR1_TNF       (1 << 3)        /* Transmit FIFO not full */
 73 #define ICSR1_RNE       (1 << 2)        /* Receive FIFO not empty */
 74 #define ICSR1_TBY       (1 << 1)        /* Tramsmiter busy flag */
 75 #define ICSR1_RSY       (1 << 0)        /* Recevier synchronized flag */
 76 
 77 #define IrSR_RXPL_NEG_IS_ZERO (1<<4)
 78 #define IrSR_RXPL_POS_IS_ZERO 0x0
 79 #define IrSR_TXPL_NEG_IS_ZERO (1<<3)
 80 #define IrSR_TXPL_POS_IS_ZERO 0x0
 81 #define IrSR_XMODE_PULSE_1_6  (1<<2)
 82 #define IrSR_XMODE_PULSE_3_16 0x0
 83 #define IrSR_RCVEIR_IR_MODE   (1<<1)
 84 #define IrSR_RCVEIR_UART_MODE 0x0
 85 #define IrSR_XMITIR_IR_MODE   (1<<0)
 86 #define IrSR_XMITIR_UART_MODE 0x0
 87 
 88 #define IrSR_IR_RECEIVE_ON (\
 89                 IrSR_RXPL_NEG_IS_ZERO | \
 90                 IrSR_TXPL_POS_IS_ZERO | \
 91                 IrSR_XMODE_PULSE_3_16 | \
 92                 IrSR_RCVEIR_IR_MODE   | \
 93                 IrSR_XMITIR_UART_MODE)
 94 
 95 #define IrSR_IR_TRANSMIT_ON (\
 96                 IrSR_RXPL_NEG_IS_ZERO | \
 97                 IrSR_TXPL_POS_IS_ZERO | \
 98                 IrSR_XMODE_PULSE_3_16 | \
 99                 IrSR_RCVEIR_UART_MODE | \
100                 IrSR_XMITIR_IR_MODE)
101 
102 struct pxa_irda {
103         int                     speed;
104         int                     newspeed;
105         unsigned long           last_oscr;
106 
107         unsigned char           *dma_rx_buff;
108         unsigned char           *dma_tx_buff;
109         dma_addr_t              dma_rx_buff_phy;
110         dma_addr_t              dma_tx_buff_phy;
111         unsigned int            dma_tx_buff_len;
112         int                     txdma;
113         int                     rxdma;
114 
115         int                     uart_irq;
116         int                     icp_irq;
117 
118         struct irlap_cb         *irlap;
119         struct qos_info         qos;
120 
121         iobuff_t                tx_buff;
122         iobuff_t                rx_buff;
123 
124         struct device           *dev;
125         struct pxaficp_platform_data *pdata;
126         struct clk              *fir_clk;
127         struct clk              *sir_clk;
128         struct clk              *cur_clk;
129 };
130 
131 static inline void pxa_irda_disable_clk(struct pxa_irda *si)
132 {
133         if (si->cur_clk)
134                 clk_disable_unprepare(si->cur_clk);
135         si->cur_clk = NULL;
136 }
137 
138 static inline void pxa_irda_enable_firclk(struct pxa_irda *si)
139 {
140         si->cur_clk = si->fir_clk;
141         clk_prepare_enable(si->fir_clk);
142 }
143 
144 static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
145 {
146         si->cur_clk = si->sir_clk;
147         clk_prepare_enable(si->sir_clk);
148 }
149 
150 
151 #define IS_FIR(si)              ((si)->speed >= 4000000)
152 #define IRDA_FRAME_SIZE_LIMIT   2047
153 
154 inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
155 {
156         DCSR(si->rxdma)  = DCSR_NODESC;
157         DSADR(si->rxdma) = __PREG(ICDR);
158         DTADR(si->rxdma) = si->dma_rx_buff_phy;
159         DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC |  DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
160         DCSR(si->rxdma) |= DCSR_RUN;
161 }
162 
163 inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
164 {
165         DCSR(si->txdma)  = DCSR_NODESC;
166         DSADR(si->txdma) = si->dma_tx_buff_phy;
167         DTADR(si->txdma) = __PREG(ICDR);
168         DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG |  DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
169         DCSR(si->txdma) |= DCSR_RUN;
170 }
171 
172 /*
173  * Set the IrDA communications mode.
174  */
175 static void pxa_irda_set_mode(struct pxa_irda *si, int mode)
176 {
177         if (si->pdata->transceiver_mode)
178                 si->pdata->transceiver_mode(si->dev, mode);
179         else {
180                 if (gpio_is_valid(si->pdata->gpio_pwdown))
181                         gpio_set_value(si->pdata->gpio_pwdown,
182                                         !(mode & IR_OFF) ^
183                                         !si->pdata->gpio_pwdown_inverted);
184                 pxa2xx_transceiver_mode(si->dev, mode);
185         }
186 }
187 
188 /*
189  * Set the IrDA communications speed.
190  */
191 static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
192 {
193         unsigned long flags;
194         unsigned int divisor;
195 
196         switch (speed) {
197         case 9600:      case 19200:     case 38400:
198         case 57600:     case 115200:
199 
200                 /* refer to PXA250/210 Developer's Manual 10-7 */
201                 /*  BaudRate = 14.7456 MHz / (16*Divisor) */
202                 divisor = 14745600 / (16 * speed);
203 
204                 local_irq_save(flags);
205 
206                 if (IS_FIR(si)) {
207                         /* stop RX DMA */
208                         DCSR(si->rxdma) &= ~DCSR_RUN;
209                         /* disable FICP */
210                         ICCR0 = 0;
211                         pxa_irda_disable_clk(si);
212 
213                         /* set board transceiver to SIR mode */
214                         pxa_irda_set_mode(si, IR_SIRMODE);
215 
216                         /* enable the STUART clock */
217                         pxa_irda_enable_sirclk(si);
218                 }
219 
220                 /* disable STUART first */
221                 STIER = 0;
222 
223                 /* access DLL & DLH */
224                 STLCR |= LCR_DLAB;
225                 STDLL = divisor & 0xff;
226                 STDLH = divisor >> 8;
227                 STLCR &= ~LCR_DLAB;
228 
229                 si->speed = speed;
230                 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
231                 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
232 
233                 local_irq_restore(flags);
234                 break;
235 
236         case 4000000:
237                 local_irq_save(flags);
238 
239                 /* disable STUART */
240                 STIER = 0;
241                 STISR = 0;
242                 pxa_irda_disable_clk(si);
243 
244                 /* disable FICP first */
245                 ICCR0 = 0;
246 
247                 /* set board transceiver to FIR mode */
248                 pxa_irda_set_mode(si, IR_FIRMODE);
249 
250                 /* enable the FICP clock */
251                 pxa_irda_enable_firclk(si);
252 
253                 si->speed = speed;
254                 pxa_irda_fir_dma_rx_start(si);
255                 ICCR0 = ICCR0_ITR | ICCR0_RXE;
256 
257                 local_irq_restore(flags);
258                 break;
259 
260         default:
261                 return -EINVAL;
262         }
263 
264         return 0;
265 }
266 
267 /* SIR interrupt service routine. */
268 static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
269 {
270         struct net_device *dev = dev_id;
271         struct pxa_irda *si = netdev_priv(dev);
272         int iir, lsr, data;
273 
274         iir = STIIR;
275 
276         switch  (iir & 0x0F) {
277         case 0x06: /* Receiver Line Status */
278                 lsr = STLSR;
279                 while (lsr & LSR_FIFOE) {
280                         data = STRBR;
281                         if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
282                                 printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
283                                 dev->stats.rx_errors++;
284                                 if (lsr & LSR_FE)
285                                         dev->stats.rx_frame_errors++;
286                                 if (lsr & LSR_OE)
287                                         dev->stats.rx_fifo_errors++;
288                         } else {
289                                 dev->stats.rx_bytes++;
290                                 async_unwrap_char(dev, &dev->stats,
291                                                   &si->rx_buff, data);
292                         }
293                         lsr = STLSR;
294                 }
295                 si->last_oscr = readl_relaxed(OSCR);
296                 break;
297 
298         case 0x04: /* Received Data Available */
299                    /* forth through */
300 
301         case 0x0C: /* Character Timeout Indication */
302                 do  {
303                     dev->stats.rx_bytes++;
304                     async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
305                 } while (STLSR & LSR_DR);
306                 si->last_oscr = readl_relaxed(OSCR);
307                 break;
308 
309         case 0x02: /* Transmit FIFO Data Request */
310                 while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
311                         STTHR = *si->tx_buff.data++;
312                         si->tx_buff.len -= 1;
313                 }
314 
315                 if (si->tx_buff.len == 0) {
316                         dev->stats.tx_packets++;
317                         dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;
318 
319                         /* We need to ensure that the transmitter has finished. */
320                         while ((STLSR & LSR_TEMT) == 0)
321                                 cpu_relax();
322                         si->last_oscr = readl_relaxed(OSCR);
323 
324                         /*
325                         * Ok, we've finished transmitting.  Now enable
326                         * the receiver.  Sometimes we get a receive IRQ
327                         * immediately after a transmit...
328                         */
329                         if (si->newspeed) {
330                                 pxa_irda_set_speed(si, si->newspeed);
331                                 si->newspeed = 0;
332                         } else {
333                                 /* enable IR Receiver, disable IR Transmitter */
334                                 STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
335                                 /* enable STUART and receive interrupts */
336                                 STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
337                         }
338                         /* I'm hungry! */
339                         netif_wake_queue(dev);
340                 }
341                 break;
342         }
343 
344         return IRQ_HANDLED;
345 }
346 
347 /* FIR Receive DMA interrupt handler */
348 static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
349 {
350         int dcsr = DCSR(channel);
351 
352         DCSR(channel) = dcsr & ~DCSR_RUN;
353 
354         printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
355 }
356 
357 /* FIR Transmit DMA interrupt handler */
358 static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
359 {
360         struct net_device *dev = data;
361         struct pxa_irda *si = netdev_priv(dev);
362         int dcsr;
363 
364         dcsr = DCSR(channel);
365         DCSR(channel) = dcsr & ~DCSR_RUN;
366 
367         if (dcsr & DCSR_ENDINTR)  {
368                 dev->stats.tx_packets++;
369                 dev->stats.tx_bytes += si->dma_tx_buff_len;
370         } else {
371                 dev->stats.tx_errors++;
372         }
373 
374         while (ICSR1 & ICSR1_TBY)
375                 cpu_relax();
376         si->last_oscr = readl_relaxed(OSCR);
377 
378         /*
379          * HACK: It looks like the TBY bit is dropped too soon.
380          * Without this delay things break.
381          */
382         udelay(120);
383 
384         if (si->newspeed) {
385                 pxa_irda_set_speed(si, si->newspeed);
386                 si->newspeed = 0;
387         } else {
388                 int i = 64;
389 
390                 ICCR0 = 0;
391                 pxa_irda_fir_dma_rx_start(si);
392                 while ((ICSR1 & ICSR1_RNE) && i--)
393                         (void)ICDR;
394                 ICCR0 = ICCR0_ITR | ICCR0_RXE;
395 
396                 if (i < 0)
397                         printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
398         }
399         netif_wake_queue(dev);
400 }
401 
402 /* EIF(Error in FIFO/End in Frame) handler for FIR */
403 static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
404 {
405         unsigned int len, stat, data;
406 
407         /* Get the current data position. */
408         len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
409 
410         do {
411                 /* Read Status, and then Data.   */
412                 stat = ICSR1;
413                 rmb();
414                 data = ICDR;
415 
416                 if (stat & (ICSR1_CRE | ICSR1_ROR)) {
417                         dev->stats.rx_errors++;
418                         if (stat & ICSR1_CRE) {
419                                 printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
420                                 dev->stats.rx_crc_errors++;
421                         }
422                         if (stat & ICSR1_ROR) {
423                                 printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
424                                 dev->stats.rx_over_errors++;
425                         }
426                 } else  {
427                         si->dma_rx_buff[len++] = data;
428                 }
429                 /* If we hit the end of frame, there's no point in continuing. */
430                 if (stat & ICSR1_EOF)
431                         break;
432         } while (ICSR0 & ICSR0_EIF);
433 
434         if (stat & ICSR1_EOF) {
435                 /* end of frame. */
436                 struct sk_buff *skb;
437 
438                 if (icsr0 & ICSR0_FRE) {
439                         printk(KERN_ERR "pxa_ir: dropping erroneous frame\n");
440                         dev->stats.rx_dropped++;
441                         return;
442                 }
443 
444                 skb = alloc_skb(len+1,GFP_ATOMIC);
445                 if (!skb)  {
446                         printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
447                         dev->stats.rx_dropped++;
448                         return;
449                 }
450 
451                 /* Align IP header to 20 bytes  */
452                 skb_reserve(skb, 1);
453                 skb_copy_to_linear_data(skb, si->dma_rx_buff, len);
454                 skb_put(skb, len);
455 
456                 /* Feed it to IrLAP  */
457                 skb->dev = dev;
458                 skb_reset_mac_header(skb);
459                 skb->protocol = htons(ETH_P_IRDA);
460                 netif_rx(skb);
461 
462                 dev->stats.rx_packets++;
463                 dev->stats.rx_bytes += len;
464         }
465 }
466 
467 /* FIR interrupt handler */
468 static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
469 {
470         struct net_device *dev = dev_id;
471         struct pxa_irda *si = netdev_priv(dev);
472         int icsr0, i = 64;
473 
474         /* stop RX DMA */
475         DCSR(si->rxdma) &= ~DCSR_RUN;
476         si->last_oscr = readl_relaxed(OSCR);
477         icsr0 = ICSR0;
478 
479         if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
480                 if (icsr0 & ICSR0_FRE) {
481                         printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
482                         dev->stats.rx_frame_errors++;
483                 } else {
484                         printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
485                         dev->stats.rx_errors++;
486                 }
487                 ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
488         }
489 
490         if (icsr0 & ICSR0_EIF) {
491                 /* An error in FIFO occurred, or there is a end of frame */
492                 pxa_irda_fir_irq_eif(si, dev, icsr0);
493         }
494 
495         ICCR0 = 0;
496         pxa_irda_fir_dma_rx_start(si);
497         while ((ICSR1 & ICSR1_RNE) && i--)
498                 (void)ICDR;
499         ICCR0 = ICCR0_ITR | ICCR0_RXE;
500 
501         if (i < 0)
502                 printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
503 
504         return IRQ_HANDLED;
505 }
506 
507 /* hard_xmit interface of irda device */
508 static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
509 {
510         struct pxa_irda *si = netdev_priv(dev);
511         int speed = irda_get_next_speed(skb);
512 
513         /*
514          * Does this packet contain a request to change the interface
515          * speed?  If so, remember it until we complete the transmission
516          * of this frame.
517          */
518         if (speed != si->speed && speed != -1)
519                 si->newspeed = speed;
520 
521         /*
522          * If this is an empty frame, we can bypass a lot.
523          */
524         if (skb->len == 0) {
525                 if (si->newspeed) {
526                         si->newspeed = 0;
527                         pxa_irda_set_speed(si, speed);
528                 }
529                 dev_kfree_skb(skb);
530                 return NETDEV_TX_OK;
531         }
532 
533         netif_stop_queue(dev);
534 
535         if (!IS_FIR(si)) {
536                 si->tx_buff.data = si->tx_buff.head;
537                 si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
538 
539                 /* Disable STUART interrupts and switch to transmit mode. */
540                 STIER = 0;
541                 STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
542 
543                 /* enable STUART and transmit interrupts */
544                 STIER = IER_UUE | IER_TIE;
545         } else {
546                 unsigned long mtt = irda_get_mtt(skb);
547 
548                 si->dma_tx_buff_len = skb->len;
549                 skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
550 
551                 if (mtt)
552                         while ((unsigned)(readl_relaxed(OSCR) - si->last_oscr)/4 < mtt)
553                                 cpu_relax();
554 
555                 /* stop RX DMA,  disable FICP */
556                 DCSR(si->rxdma) &= ~DCSR_RUN;
557                 ICCR0 = 0;
558 
559                 pxa_irda_fir_dma_tx_start(si);
560                 ICCR0 = ICCR0_ITR | ICCR0_TXE;
561         }
562 
563         dev_kfree_skb(skb);
564         return NETDEV_TX_OK;
565 }
566 
567 static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
568 {
569         struct if_irda_req *rq = (struct if_irda_req *)ifreq;
570         struct pxa_irda *si = netdev_priv(dev);
571         int ret;
572 
573         switch (cmd) {
574         case SIOCSBANDWIDTH:
575                 ret = -EPERM;
576                 if (capable(CAP_NET_ADMIN)) {
577                         /*
578                          * We are unable to set the speed if the
579                          * device is not running.
580                          */
581                         if (netif_running(dev)) {
582                                 ret = pxa_irda_set_speed(si,
583                                                 rq->ifr_baudrate);
584                         } else {
585                                 printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
586                                 ret = 0;
587                         }
588                 }
589                 break;
590 
591         case SIOCSMEDIABUSY:
592                 ret = -EPERM;
593                 if (capable(CAP_NET_ADMIN)) {
594                         irda_device_set_media_busy(dev, TRUE);
595                         ret = 0;
596                 }
597                 break;
598 
599         case SIOCGRECEIVING:
600                 ret = 0;
601                 rq->ifr_receiving = IS_FIR(si) ? 0
602                                         : si->rx_buff.state != OUTSIDE_FRAME;
603                 break;
604 
605         default:
606                 ret = -EOPNOTSUPP;
607                 break;
608         }
609 
610         return ret;
611 }
612 
613 static void pxa_irda_startup(struct pxa_irda *si)
614 {
615         /* Disable STUART interrupts */
616         STIER = 0;
617         /* enable STUART interrupt to the processor */
618         STMCR = MCR_OUT2;
619         /* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
620         STLCR = LCR_WLS0 | LCR_WLS1;
621         /* enable FIFO, we use FIFO to improve performance */
622         STFCR = FCR_TRFIFOE | FCR_ITL_32;
623 
624         /* disable FICP */
625         ICCR0 = 0;
626         /* configure FICP ICCR2 */
627         ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
628 
629         /* configure DMAC */
630         DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
631         DRCMR(18) = si->txdma | DRCMR_MAPVLD;
632 
633         /* force SIR reinitialization */
634         si->speed = 4000000;
635         pxa_irda_set_speed(si, 9600);
636 
637         printk(KERN_DEBUG "pxa_ir: irda startup\n");
638 }
639 
640 static void pxa_irda_shutdown(struct pxa_irda *si)
641 {
642         unsigned long flags;
643 
644         local_irq_save(flags);
645 
646         /* disable STUART and interrupt */
647         STIER = 0;
648         /* disable STUART SIR mode */
649         STISR = 0;
650 
651         /* disable DMA */
652         DCSR(si->txdma) &= ~DCSR_RUN;
653         DCSR(si->rxdma) &= ~DCSR_RUN;
654         /* disable FICP */
655         ICCR0 = 0;
656 
657         /* disable the STUART or FICP clocks */
658         pxa_irda_disable_clk(si);
659 
660         DRCMR(17) = 0;
661         DRCMR(18) = 0;
662 
663         local_irq_restore(flags);
664 
665         /* power off board transceiver */
666         pxa_irda_set_mode(si, IR_OFF);
667 
668         printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
669 }
670 
671 static int pxa_irda_start(struct net_device *dev)
672 {
673         struct pxa_irda *si = netdev_priv(dev);
674         int err;
675 
676         si->speed = 9600;
677 
678         err = request_irq(si->uart_irq, pxa_irda_sir_irq, 0, dev->name, dev);
679         if (err)
680                 goto err_irq1;
681 
682         err = request_irq(si->icp_irq, pxa_irda_fir_irq, 0, dev->name, dev);
683         if (err)
684                 goto err_irq2;
685 
686         /*
687          * The interrupt must remain disabled for now.
688          */
689         disable_irq(si->uart_irq);
690         disable_irq(si->icp_irq);
691 
692         err = -EBUSY;
693         si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
694         if (si->rxdma < 0)
695                 goto err_rx_dma;
696 
697         si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
698         if (si->txdma < 0)
699                 goto err_tx_dma;
700 
701         err = -ENOMEM;
702         si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
703                                              &si->dma_rx_buff_phy, GFP_KERNEL);
704         if (!si->dma_rx_buff)
705                 goto err_dma_rx_buff;
706 
707         si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
708                                              &si->dma_tx_buff_phy, GFP_KERNEL);
709         if (!si->dma_tx_buff)
710                 goto err_dma_tx_buff;
711 
712         /* Setup the serial port for the initial speed. */
713         pxa_irda_startup(si);
714 
715         /*
716          * Open a new IrLAP layer instance.
717          */
718         si->irlap = irlap_open(dev, &si->qos, "pxa");
719         err = -ENOMEM;
720         if (!si->irlap)
721                 goto err_irlap;
722 
723         /*
724          * Now enable the interrupt and start the queue
725          */
726         enable_irq(si->uart_irq);
727         enable_irq(si->icp_irq);
728         netif_start_queue(dev);
729 
730         printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
731 
732         return 0;
733 
734 err_irlap:
735         pxa_irda_shutdown(si);
736         dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
737 err_dma_tx_buff:
738         dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
739 err_dma_rx_buff:
740         pxa_free_dma(si->txdma);
741 err_tx_dma:
742         pxa_free_dma(si->rxdma);
743 err_rx_dma:
744         free_irq(si->icp_irq, dev);
745 err_irq2:
746         free_irq(si->uart_irq, dev);
747 err_irq1:
748 
749         return err;
750 }
751 
752 static int pxa_irda_stop(struct net_device *dev)
753 {
754         struct pxa_irda *si = netdev_priv(dev);
755 
756         netif_stop_queue(dev);
757 
758         pxa_irda_shutdown(si);
759 
760         /* Stop IrLAP */
761         if (si->irlap) {
762                 irlap_close(si->irlap);
763                 si->irlap = NULL;
764         }
765 
766         free_irq(si->uart_irq, dev);
767         free_irq(si->icp_irq, dev);
768 
769         pxa_free_dma(si->rxdma);
770         pxa_free_dma(si->txdma);
771 
772         if (si->dma_rx_buff)
773                 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
774         if (si->dma_tx_buff)
775                 dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
776 
777         printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
778         return 0;
779 }
780 
781 static int pxa_irda_suspend(struct platform_device *_dev, pm_message_t state)
782 {
783         struct net_device *dev = platform_get_drvdata(_dev);
784         struct pxa_irda *si;
785 
786         if (dev && netif_running(dev)) {
787                 si = netdev_priv(dev);
788                 netif_device_detach(dev);
789                 pxa_irda_shutdown(si);
790         }
791 
792         return 0;
793 }
794 
795 static int pxa_irda_resume(struct platform_device *_dev)
796 {
797         struct net_device *dev = platform_get_drvdata(_dev);
798         struct pxa_irda *si;
799 
800         if (dev && netif_running(dev)) {
801                 si = netdev_priv(dev);
802                 pxa_irda_startup(si);
803                 netif_device_attach(dev);
804                 netif_wake_queue(dev);
805         }
806 
807         return 0;
808 }
809 
810 
811 static int pxa_irda_init_iobuf(iobuff_t *io, int size)
812 {
813         io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
814         if (io->head != NULL) {
815                 io->truesize = size;
816                 io->in_frame = FALSE;
817                 io->state    = OUTSIDE_FRAME;
818                 io->data     = io->head;
819         }
820         return io->head ? 0 : -ENOMEM;
821 }
822 
823 static const struct net_device_ops pxa_irda_netdev_ops = {
824         .ndo_open               = pxa_irda_start,
825         .ndo_stop               = pxa_irda_stop,
826         .ndo_start_xmit         = pxa_irda_hard_xmit,
827         .ndo_do_ioctl           = pxa_irda_ioctl,
828 };
829 
830 static int pxa_irda_probe(struct platform_device *pdev)
831 {
832         struct net_device *dev;
833         struct pxa_irda *si;
834         unsigned int baudrate_mask;
835         int err;
836 
837         if (!pdev->dev.platform_data)
838                 return -ENODEV;
839 
840         err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
841         if (err)
842                 goto err_mem_1;
843 
844         err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
845         if (err)
846                 goto err_mem_2;
847 
848         dev = alloc_irdadev(sizeof(struct pxa_irda));
849         if (!dev) {
850                 err = -ENOMEM;
851                 goto err_mem_3;
852         }
853 
854         SET_NETDEV_DEV(dev, &pdev->dev);
855         si = netdev_priv(dev);
856         si->dev = &pdev->dev;
857         si->pdata = pdev->dev.platform_data;
858 
859         si->uart_irq = platform_get_irq(pdev, 0);
860         si->icp_irq = platform_get_irq(pdev, 1);
861 
862         si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
863         si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
864         if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
865                 err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
866                 goto err_mem_4;
867         }
868 
869         /*
870          * Initialise the SIR buffers
871          */
872         err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
873         if (err)
874                 goto err_mem_4;
875         err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
876         if (err)
877                 goto err_mem_5;
878 
879         if (gpio_is_valid(si->pdata->gpio_pwdown)) {
880                 err = gpio_request(si->pdata->gpio_pwdown, "IrDA switch");
881                 if (err)
882                         goto err_startup;
883                 err = gpio_direction_output(si->pdata->gpio_pwdown,
884                                         !si->pdata->gpio_pwdown_inverted);
885                 if (err) {
886                         gpio_free(si->pdata->gpio_pwdown);
887                         goto err_startup;
888                 }
889         }
890 
891         if (si->pdata->startup) {
892                 err = si->pdata->startup(si->dev);
893                 if (err)
894                         goto err_startup;
895         }
896 
897         if (gpio_is_valid(si->pdata->gpio_pwdown) && si->pdata->startup)
898                 dev_warn(si->dev, "gpio_pwdown and startup() both defined!\n");
899 
900         dev->netdev_ops = &pxa_irda_netdev_ops;
901 
902         irda_init_max_qos_capabilies(&si->qos);
903 
904         baudrate_mask = 0;
905         if (si->pdata->transceiver_cap & IR_SIRMODE)
906                 baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
907         if (si->pdata->transceiver_cap & IR_FIRMODE)
908                 baudrate_mask |= IR_4000000 << 8;
909 
910         si->qos.baud_rate.bits &= baudrate_mask;
911         si->qos.min_turn_time.bits = 7;  /* 1ms or more */
912 
913         irda_qos_bits_to_value(&si->qos);
914 
915         err = register_netdev(dev);
916 
917         if (err == 0)
918                 platform_set_drvdata(pdev, dev);
919 
920         if (err) {
921                 if (si->pdata->shutdown)
922                         si->pdata->shutdown(si->dev);
923 err_startup:
924                 kfree(si->tx_buff.head);
925 err_mem_5:
926                 kfree(si->rx_buff.head);
927 err_mem_4:
928                 if (si->sir_clk && !IS_ERR(si->sir_clk))
929                         clk_put(si->sir_clk);
930                 if (si->fir_clk && !IS_ERR(si->fir_clk))
931                         clk_put(si->fir_clk);
932                 free_netdev(dev);
933 err_mem_3:
934                 release_mem_region(__PREG(FICP), 0x1c);
935 err_mem_2:
936                 release_mem_region(__PREG(STUART), 0x24);
937         }
938 err_mem_1:
939         return err;
940 }
941 
942 static int pxa_irda_remove(struct platform_device *_dev)
943 {
944         struct net_device *dev = platform_get_drvdata(_dev);
945 
946         if (dev) {
947                 struct pxa_irda *si = netdev_priv(dev);
948                 unregister_netdev(dev);
949                 if (gpio_is_valid(si->pdata->gpio_pwdown))
950                         gpio_free(si->pdata->gpio_pwdown);
951                 if (si->pdata->shutdown)
952                         si->pdata->shutdown(si->dev);
953                 kfree(si->tx_buff.head);
954                 kfree(si->rx_buff.head);
955                 clk_put(si->fir_clk);
956                 clk_put(si->sir_clk);
957                 free_netdev(dev);
958         }
959 
960         release_mem_region(__PREG(STUART), 0x24);
961         release_mem_region(__PREG(FICP), 0x1c);
962 
963         return 0;
964 }
965 
966 static struct platform_driver pxa_ir_driver = {
967         .driver         = {
968                 .name   = "pxa2xx-ir",
969                 .owner  = THIS_MODULE,
970         },
971         .probe          = pxa_irda_probe,
972         .remove         = pxa_irda_remove,
973         .suspend        = pxa_irda_suspend,
974         .resume         = pxa_irda_resume,
975 };
976 
977 module_platform_driver(pxa_ir_driver);
978 
979 MODULE_LICENSE("GPL");
980 MODULE_ALIAS("platform:pxa2xx-ir");
981 

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