2 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/device.h>
22 #include <linux/ioport.h>
23 #include <linux/errno.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26 #include <linux/spi/pxa2xx_spi.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/spi/spi.h>
29 #include <linux/workqueue.h>
30 #include <linux/delay.h>
31 #include <linux/gpio.h>
32 #include <linux/slab.h>
36 #include <asm/delay.h>
39 MODULE_AUTHOR("Stephen Street");
40 MODULE_DESCRIPTION("PXA2xx SSP SPI Controller");
41 MODULE_LICENSE("GPL");
42 MODULE_ALIAS("platform:pxa2xx-spi");
46 #define TIMOUT_DFLT 1000
48 #define DMA_INT_MASK (DCSR_ENDINTR | DCSR_STARTINTR | DCSR_BUSERR)
49 #define RESET_DMA_CHANNEL (DCSR_NODESC | DMA_INT_MASK)
50 #define IS_DMA_ALIGNED(x) IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT)
51 #define MAX_DMA_LEN 8191
52 #define DMA_ALIGNMENT 8
55 * for testing SSCR1 changes that require SSP restart, basically
56 * everything except the service and interrupt enables, the pxa270 developer
57 * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this
58 * list, but the PXA255 dev man says all bits without really meaning the
59 * service and interrupt enables
61 #define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \
62 | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \
63 | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \
64 | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \
65 | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \
66 | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
68 #define DEFINE_SSP_REG(reg, off) \
69 static inline u32 read_##reg(void const __iomem *p) \
70 { return __raw_readl(p + (off)); } \
72 static inline void write_##reg(u32 v, void __iomem *p) \
73 { __raw_writel(v, p + (off)); }
75 DEFINE_SSP_REG(SSCR0, 0x00)
76 DEFINE_SSP_REG(SSCR1, 0x04)
77 DEFINE_SSP_REG(SSSR, 0x08)
78 DEFINE_SSP_REG(SSITR, 0x0c)
79 DEFINE_SSP_REG(SSDR, 0x10)
80 DEFINE_SSP_REG(SSTO, 0x28)
81 DEFINE_SSP_REG(SSPSP, 0x2c)
83 #define START_STATE ((void*)0)
84 #define RUNNING_STATE ((void*)1)
85 #define DONE_STATE ((void*)2)
86 #define ERROR_STATE ((void*)-1)
89 /* Driver model hookup */
90 struct platform_device *pdev;
93 struct ssp_device *ssp;
95 /* SPI framework hookup */
96 enum pxa_ssp_type ssp_type;
97 struct spi_master *master;
100 struct pxa2xx_spi_master *master_info;
102 /* DMA setup stuff */
107 /* SSP register addresses */
108 void __iomem *ioaddr;
117 /* Message Transfer pump */
118 struct tasklet_struct pump_transfers;
120 /* Current message transfer state info */
121 struct spi_message* cur_msg;
122 struct spi_transfer* cur_transfer;
123 struct chip_data *cur_chip;
136 int (*write)(struct driver_data *drv_data);
137 int (*read)(struct driver_data *drv_data);
138 irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
139 void (*cs_control)(u32 command);
159 int gpio_cs_inverted;
160 int (*write)(struct driver_data *drv_data);
161 int (*read)(struct driver_data *drv_data);
162 void (*cs_control)(u32 command);
165 static void cs_assert(struct driver_data *drv_data)
167 struct chip_data *chip = drv_data->cur_chip;
169 if (drv_data->ssp_type == CE4100_SSP) {
170 write_SSSR(drv_data->cur_chip->frm, drv_data->ioaddr);
174 if (chip->cs_control) {
175 chip->cs_control(PXA2XX_CS_ASSERT);
179 if (gpio_is_valid(chip->gpio_cs))
180 gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted);
183 static void cs_deassert(struct driver_data *drv_data)
185 struct chip_data *chip = drv_data->cur_chip;
187 if (drv_data->ssp_type == CE4100_SSP)
190 if (chip->cs_control) {
191 chip->cs_control(PXA2XX_CS_DEASSERT);
195 if (gpio_is_valid(chip->gpio_cs))
196 gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted);
199 static void write_SSSR_CS(struct driver_data *drv_data, u32 val)
201 void __iomem *reg = drv_data->ioaddr;
203 if (drv_data->ssp_type == CE4100_SSP)
204 val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK;
206 write_SSSR(val, reg);
209 static int pxa25x_ssp_comp(struct driver_data *drv_data)
211 if (drv_data->ssp_type == PXA25x_SSP)
213 if (drv_data->ssp_type == CE4100_SSP)
218 static int flush(struct driver_data *drv_data)
220 unsigned long limit = loops_per_jiffy << 1;
222 void __iomem *reg = drv_data->ioaddr;
225 while (read_SSSR(reg) & SSSR_RNE) {
228 } while ((read_SSSR(reg) & SSSR_BSY) && --limit);
229 write_SSSR_CS(drv_data, SSSR_ROR);
234 static int null_writer(struct driver_data *drv_data)
236 void __iomem *reg = drv_data->ioaddr;
237 u8 n_bytes = drv_data->n_bytes;
239 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
240 || (drv_data->tx == drv_data->tx_end))
244 drv_data->tx += n_bytes;
249 static int null_reader(struct driver_data *drv_data)
251 void __iomem *reg = drv_data->ioaddr;
252 u8 n_bytes = drv_data->n_bytes;
254 while ((read_SSSR(reg) & SSSR_RNE)
255 && (drv_data->rx < drv_data->rx_end)) {
257 drv_data->rx += n_bytes;
260 return drv_data->rx == drv_data->rx_end;
263 static int u8_writer(struct driver_data *drv_data)
265 void __iomem *reg = drv_data->ioaddr;
267 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
268 || (drv_data->tx == drv_data->tx_end))
271 write_SSDR(*(u8 *)(drv_data->tx), reg);
277 static int u8_reader(struct driver_data *drv_data)
279 void __iomem *reg = drv_data->ioaddr;
281 while ((read_SSSR(reg) & SSSR_RNE)
282 && (drv_data->rx < drv_data->rx_end)) {
283 *(u8 *)(drv_data->rx) = read_SSDR(reg);
287 return drv_data->rx == drv_data->rx_end;
290 static int u16_writer(struct driver_data *drv_data)
292 void __iomem *reg = drv_data->ioaddr;
294 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
295 || (drv_data->tx == drv_data->tx_end))
298 write_SSDR(*(u16 *)(drv_data->tx), reg);
304 static int u16_reader(struct driver_data *drv_data)
306 void __iomem *reg = drv_data->ioaddr;
308 while ((read_SSSR(reg) & SSSR_RNE)
309 && (drv_data->rx < drv_data->rx_end)) {
310 *(u16 *)(drv_data->rx) = read_SSDR(reg);
314 return drv_data->rx == drv_data->rx_end;
317 static int u32_writer(struct driver_data *drv_data)
319 void __iomem *reg = drv_data->ioaddr;
321 if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
322 || (drv_data->tx == drv_data->tx_end))
325 write_SSDR(*(u32 *)(drv_data->tx), reg);
331 static int u32_reader(struct driver_data *drv_data)
333 void __iomem *reg = drv_data->ioaddr;
335 while ((read_SSSR(reg) & SSSR_RNE)
336 && (drv_data->rx < drv_data->rx_end)) {
337 *(u32 *)(drv_data->rx) = read_SSDR(reg);
341 return drv_data->rx == drv_data->rx_end;
344 static void *next_transfer(struct driver_data *drv_data)
346 struct spi_message *msg = drv_data->cur_msg;
347 struct spi_transfer *trans = drv_data->cur_transfer;
349 /* Move to next transfer */
350 if (trans->transfer_list.next != &msg->transfers) {
351 drv_data->cur_transfer =
352 list_entry(trans->transfer_list.next,
355 return RUNNING_STATE;
360 static int map_dma_buffers(struct driver_data *drv_data)
362 struct spi_message *msg = drv_data->cur_msg;
363 struct device *dev = &msg->spi->dev;
365 if (!drv_data->cur_chip->enable_dma)
368 if (msg->is_dma_mapped)
369 return drv_data->rx_dma && drv_data->tx_dma;
371 if (!IS_DMA_ALIGNED(drv_data->rx) || !IS_DMA_ALIGNED(drv_data->tx))
374 /* Modify setup if rx buffer is null */
375 if (drv_data->rx == NULL) {
376 *drv_data->null_dma_buf = 0;
377 drv_data->rx = drv_data->null_dma_buf;
378 drv_data->rx_map_len = 4;
380 drv_data->rx_map_len = drv_data->len;
383 /* Modify setup if tx buffer is null */
384 if (drv_data->tx == NULL) {
385 *drv_data->null_dma_buf = 0;
386 drv_data->tx = drv_data->null_dma_buf;
387 drv_data->tx_map_len = 4;
389 drv_data->tx_map_len = drv_data->len;
391 /* Stream map the tx buffer. Always do DMA_TO_DEVICE first
392 * so we flush the cache *before* invalidating it, in case
393 * the tx and rx buffers overlap.
395 drv_data->tx_dma = dma_map_single(dev, drv_data->tx,
396 drv_data->tx_map_len, DMA_TO_DEVICE);
397 if (dma_mapping_error(dev, drv_data->tx_dma))
400 /* Stream map the rx buffer */
401 drv_data->rx_dma = dma_map_single(dev, drv_data->rx,
402 drv_data->rx_map_len, DMA_FROM_DEVICE);
403 if (dma_mapping_error(dev, drv_data->rx_dma)) {
404 dma_unmap_single(dev, drv_data->tx_dma,
405 drv_data->tx_map_len, DMA_TO_DEVICE);
412 static void unmap_dma_buffers(struct driver_data *drv_data)
416 if (!drv_data->dma_mapped)
419 if (!drv_data->cur_msg->is_dma_mapped) {
420 dev = &drv_data->cur_msg->spi->dev;
421 dma_unmap_single(dev, drv_data->rx_dma,
422 drv_data->rx_map_len, DMA_FROM_DEVICE);
423 dma_unmap_single(dev, drv_data->tx_dma,
424 drv_data->tx_map_len, DMA_TO_DEVICE);
427 drv_data->dma_mapped = 0;
430 /* caller already set message->status; dma and pio irqs are blocked */
431 static void giveback(struct driver_data *drv_data)
433 struct spi_transfer* last_transfer;
434 struct spi_message *msg;
436 msg = drv_data->cur_msg;
437 drv_data->cur_msg = NULL;
438 drv_data->cur_transfer = NULL;
440 last_transfer = list_entry(msg->transfers.prev,
444 /* Delay if requested before any change in chip select */
445 if (last_transfer->delay_usecs)
446 udelay(last_transfer->delay_usecs);
448 /* Drop chip select UNLESS cs_change is true or we are returning
449 * a message with an error, or next message is for another chip
451 if (!last_transfer->cs_change)
452 cs_deassert(drv_data);
454 struct spi_message *next_msg;
456 /* Holding of cs was hinted, but we need to make sure
457 * the next message is for the same chip. Don't waste
458 * time with the following tests unless this was hinted.
460 * We cannot postpone this until pump_messages, because
461 * after calling msg->complete (below) the driver that
462 * sent the current message could be unloaded, which
463 * could invalidate the cs_control() callback...
466 /* get a pointer to the next message, if any */
467 next_msg = spi_get_next_queued_message(drv_data->master);
469 /* see if the next and current messages point
472 if (next_msg && next_msg->spi != msg->spi)
474 if (!next_msg || msg->state == ERROR_STATE)
475 cs_deassert(drv_data);
478 spi_finalize_current_message(drv_data->master);
479 drv_data->cur_chip = NULL;
482 static int wait_ssp_rx_stall(void const __iomem *ioaddr)
484 unsigned long limit = loops_per_jiffy << 1;
486 while ((read_SSSR(ioaddr) & SSSR_BSY) && --limit)
492 static int wait_dma_channel_stop(int channel)
494 unsigned long limit = loops_per_jiffy << 1;
496 while (!(DCSR(channel) & DCSR_STOPSTATE) && --limit)
502 static void dma_error_stop(struct driver_data *drv_data, const char *msg)
504 void __iomem *reg = drv_data->ioaddr;
507 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
508 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
509 write_SSSR_CS(drv_data, drv_data->clear_sr);
510 write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
511 if (!pxa25x_ssp_comp(drv_data))
514 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
516 unmap_dma_buffers(drv_data);
518 dev_err(&drv_data->pdev->dev, "%s\n", msg);
520 drv_data->cur_msg->state = ERROR_STATE;
521 tasklet_schedule(&drv_data->pump_transfers);
524 static void dma_transfer_complete(struct driver_data *drv_data)
526 void __iomem *reg = drv_data->ioaddr;
527 struct spi_message *msg = drv_data->cur_msg;
529 /* Clear and disable interrupts on SSP and DMA channels*/
530 write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
531 write_SSSR_CS(drv_data, drv_data->clear_sr);
532 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
533 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
535 if (wait_dma_channel_stop(drv_data->rx_channel) == 0)
536 dev_err(&drv_data->pdev->dev,
537 "dma_handler: dma rx channel stop failed\n");
539 if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
540 dev_err(&drv_data->pdev->dev,
541 "dma_transfer: ssp rx stall failed\n");
543 unmap_dma_buffers(drv_data);
545 /* update the buffer pointer for the amount completed in dma */
546 drv_data->rx += drv_data->len -
547 (DCMD(drv_data->rx_channel) & DCMD_LENGTH);
549 /* read trailing data from fifo, it does not matter how many
550 * bytes are in the fifo just read until buffer is full
551 * or fifo is empty, which ever occurs first */
552 drv_data->read(drv_data);
554 /* return count of what was actually read */
555 msg->actual_length += drv_data->len -
556 (drv_data->rx_end - drv_data->rx);
558 /* Transfer delays and chip select release are
559 * handled in pump_transfers or giveback
562 /* Move to next transfer */
563 msg->state = next_transfer(drv_data);
565 /* Schedule transfer tasklet */
566 tasklet_schedule(&drv_data->pump_transfers);
569 static void dma_handler(int channel, void *data)
571 struct driver_data *drv_data = data;
572 u32 irq_status = DCSR(channel) & DMA_INT_MASK;
574 if (irq_status & DCSR_BUSERR) {
576 if (channel == drv_data->tx_channel)
577 dma_error_stop(drv_data,
579 "bad bus address on tx channel");
581 dma_error_stop(drv_data,
583 "bad bus address on rx channel");
587 /* PXA255x_SSP has no timeout interrupt, wait for tailing bytes */
588 if ((channel == drv_data->tx_channel)
589 && (irq_status & DCSR_ENDINTR)
590 && (drv_data->ssp_type == PXA25x_SSP)) {
592 /* Wait for rx to stall */
593 if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
594 dev_err(&drv_data->pdev->dev,
595 "dma_handler: ssp rx stall failed\n");
597 /* finish this transfer, start the next */
598 dma_transfer_complete(drv_data);
602 static irqreturn_t dma_transfer(struct driver_data *drv_data)
605 void __iomem *reg = drv_data->ioaddr;
607 irq_status = read_SSSR(reg) & drv_data->mask_sr;
608 if (irq_status & SSSR_ROR) {
609 dma_error_stop(drv_data, "dma_transfer: fifo overrun");
613 /* Check for false positive timeout */
614 if ((irq_status & SSSR_TINT)
615 && (DCSR(drv_data->tx_channel) & DCSR_RUN)) {
616 write_SSSR(SSSR_TINT, reg);
620 if (irq_status & SSSR_TINT || drv_data->rx == drv_data->rx_end) {
622 /* Clear and disable timeout interrupt, do the rest in
623 * dma_transfer_complete */
624 if (!pxa25x_ssp_comp(drv_data))
627 /* finish this transfer, start the next */
628 dma_transfer_complete(drv_data);
633 /* Opps problem detected */
637 static void reset_sccr1(struct driver_data *drv_data)
639 void __iomem *reg = drv_data->ioaddr;
640 struct chip_data *chip = drv_data->cur_chip;
643 sccr1_reg = read_SSCR1(reg) & ~drv_data->int_cr1;
644 sccr1_reg &= ~SSCR1_RFT;
645 sccr1_reg |= chip->threshold;
646 write_SSCR1(sccr1_reg, reg);
649 static void int_error_stop(struct driver_data *drv_data, const char* msg)
651 void __iomem *reg = drv_data->ioaddr;
653 /* Stop and reset SSP */
654 write_SSSR_CS(drv_data, drv_data->clear_sr);
655 reset_sccr1(drv_data);
656 if (!pxa25x_ssp_comp(drv_data))
659 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
661 dev_err(&drv_data->pdev->dev, "%s\n", msg);
663 drv_data->cur_msg->state = ERROR_STATE;
664 tasklet_schedule(&drv_data->pump_transfers);
667 static void int_transfer_complete(struct driver_data *drv_data)
669 void __iomem *reg = drv_data->ioaddr;
672 write_SSSR_CS(drv_data, drv_data->clear_sr);
673 reset_sccr1(drv_data);
674 if (!pxa25x_ssp_comp(drv_data))
677 /* Update total byte transferred return count actual bytes read */
678 drv_data->cur_msg->actual_length += drv_data->len -
679 (drv_data->rx_end - drv_data->rx);
681 /* Transfer delays and chip select release are
682 * handled in pump_transfers or giveback
685 /* Move to next transfer */
686 drv_data->cur_msg->state = next_transfer(drv_data);
688 /* Schedule transfer tasklet */
689 tasklet_schedule(&drv_data->pump_transfers);
692 static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
694 void __iomem *reg = drv_data->ioaddr;
696 u32 irq_mask = (read_SSCR1(reg) & SSCR1_TIE) ?
697 drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS;
699 u32 irq_status = read_SSSR(reg) & irq_mask;
701 if (irq_status & SSSR_ROR) {
702 int_error_stop(drv_data, "interrupt_transfer: fifo overrun");
706 if (irq_status & SSSR_TINT) {
707 write_SSSR(SSSR_TINT, reg);
708 if (drv_data->read(drv_data)) {
709 int_transfer_complete(drv_data);
714 /* Drain rx fifo, Fill tx fifo and prevent overruns */
716 if (drv_data->read(drv_data)) {
717 int_transfer_complete(drv_data);
720 } while (drv_data->write(drv_data));
722 if (drv_data->read(drv_data)) {
723 int_transfer_complete(drv_data);
727 if (drv_data->tx == drv_data->tx_end) {
731 sccr1_reg = read_SSCR1(reg);
732 sccr1_reg &= ~SSCR1_TIE;
735 * PXA25x_SSP has no timeout, set up rx threshould for the
736 * remaining RX bytes.
738 if (pxa25x_ssp_comp(drv_data)) {
740 sccr1_reg &= ~SSCR1_RFT;
742 bytes_left = drv_data->rx_end - drv_data->rx;
743 switch (drv_data->n_bytes) {
750 if (bytes_left > RX_THRESH_DFLT)
751 bytes_left = RX_THRESH_DFLT;
753 sccr1_reg |= SSCR1_RxTresh(bytes_left);
755 write_SSCR1(sccr1_reg, reg);
758 /* We did something */
762 static irqreturn_t ssp_int(int irq, void *dev_id)
764 struct driver_data *drv_data = dev_id;
765 void __iomem *reg = drv_data->ioaddr;
766 u32 sccr1_reg = read_SSCR1(reg);
767 u32 mask = drv_data->mask_sr;
770 status = read_SSSR(reg);
772 /* Ignore possible writes if we don't need to write */
773 if (!(sccr1_reg & SSCR1_TIE))
776 if (!(status & mask))
779 if (!drv_data->cur_msg) {
781 write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
782 write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
783 if (!pxa25x_ssp_comp(drv_data))
785 write_SSSR_CS(drv_data, drv_data->clear_sr);
787 dev_err(&drv_data->pdev->dev, "bad message state "
788 "in interrupt handler\n");
794 return drv_data->transfer_handler(drv_data);
797 static int set_dma_burst_and_threshold(struct chip_data *chip,
798 struct spi_device *spi,
799 u8 bits_per_word, u32 *burst_code,
802 struct pxa2xx_spi_chip *chip_info =
803 (struct pxa2xx_spi_chip *)spi->controller_data;
810 /* Set the threshold (in registers) to equal the same amount of data
811 * as represented by burst size (in bytes). The computation below
812 * is (burst_size rounded up to nearest 8 byte, word or long word)
813 * divided by (bytes/register); the tx threshold is the inverse of
814 * the rx, so that there will always be enough data in the rx fifo
815 * to satisfy a burst, and there will always be enough space in the
816 * tx fifo to accept a burst (a tx burst will overwrite the fifo if
817 * there is not enough space), there must always remain enough empty
818 * space in the rx fifo for any data loaded to the tx fifo.
819 * Whenever burst_size (in bytes) equals bits/word, the fifo threshold
820 * will be 8, or half the fifo;
821 * The threshold can only be set to 2, 4 or 8, but not 16, because
822 * to burst 16 to the tx fifo, the fifo would have to be empty;
823 * however, the minimum fifo trigger level is 1, and the tx will
824 * request service when the fifo is at this level, with only 15 spaces.
827 /* find bytes/word */
828 if (bits_per_word <= 8)
830 else if (bits_per_word <= 16)
835 /* use struct pxa2xx_spi_chip->dma_burst_size if available */
837 req_burst_size = chip_info->dma_burst_size;
839 switch (chip->dma_burst_size) {
841 /* if the default burst size is not set,
843 chip->dma_burst_size = DCMD_BURST8;
855 if (req_burst_size <= 8) {
856 *burst_code = DCMD_BURST8;
858 } else if (req_burst_size <= 16) {
859 if (bytes_per_word == 1) {
860 /* don't burst more than 1/2 the fifo */
861 *burst_code = DCMD_BURST8;
865 *burst_code = DCMD_BURST16;
869 if (bytes_per_word == 1) {
870 /* don't burst more than 1/2 the fifo */
871 *burst_code = DCMD_BURST8;
874 } else if (bytes_per_word == 2) {
875 /* don't burst more than 1/2 the fifo */
876 *burst_code = DCMD_BURST16;
880 *burst_code = DCMD_BURST32;
885 thresh_words = burst_bytes / bytes_per_word;
887 /* thresh_words will be between 2 and 8 */
888 *threshold = (SSCR1_RxTresh(thresh_words) & SSCR1_RFT)
889 | (SSCR1_TxTresh(16-thresh_words) & SSCR1_TFT);
894 static unsigned int ssp_get_clk_div(struct ssp_device *ssp, int rate)
896 unsigned long ssp_clk = clk_get_rate(ssp->clk);
898 if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
899 return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8;
901 return ((ssp_clk / rate - 1) & 0xfff) << 8;
904 static void pump_transfers(unsigned long data)
906 struct driver_data *drv_data = (struct driver_data *)data;
907 struct spi_message *message = NULL;
908 struct spi_transfer *transfer = NULL;
909 struct spi_transfer *previous = NULL;
910 struct chip_data *chip = NULL;
911 struct ssp_device *ssp = drv_data->ssp;
912 void __iomem *reg = drv_data->ioaddr;
918 u32 dma_thresh = drv_data->cur_chip->dma_threshold;
919 u32 dma_burst = drv_data->cur_chip->dma_burst_size;
921 /* Get current state information */
922 message = drv_data->cur_msg;
923 transfer = drv_data->cur_transfer;
924 chip = drv_data->cur_chip;
926 /* Handle for abort */
927 if (message->state == ERROR_STATE) {
928 message->status = -EIO;
933 /* Handle end of message */
934 if (message->state == DONE_STATE) {
940 /* Delay if requested at end of transfer before CS change */
941 if (message->state == RUNNING_STATE) {
942 previous = list_entry(transfer->transfer_list.prev,
945 if (previous->delay_usecs)
946 udelay(previous->delay_usecs);
948 /* Drop chip select only if cs_change is requested */
949 if (previous->cs_change)
950 cs_deassert(drv_data);
953 /* Check for transfers that need multiple DMA segments */
954 if (transfer->len > MAX_DMA_LEN && chip->enable_dma) {
956 /* reject already-mapped transfers; PIO won't always work */
957 if (message->is_dma_mapped
958 || transfer->rx_dma || transfer->tx_dma) {
959 dev_err(&drv_data->pdev->dev,
960 "pump_transfers: mapped transfer length "
961 "of %u is greater than %d\n",
962 transfer->len, MAX_DMA_LEN);
963 message->status = -EINVAL;
968 /* warn ... we force this to PIO mode */
969 if (printk_ratelimit())
970 dev_warn(&message->spi->dev, "pump_transfers: "
971 "DMA disabled for transfer length %ld "
973 (long)drv_data->len, MAX_DMA_LEN);
976 /* Setup the transfer state based on the type of transfer */
977 if (flush(drv_data) == 0) {
978 dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
979 message->status = -EIO;
983 drv_data->n_bytes = chip->n_bytes;
984 drv_data->dma_width = chip->dma_width;
985 drv_data->tx = (void *)transfer->tx_buf;
986 drv_data->tx_end = drv_data->tx + transfer->len;
987 drv_data->rx = transfer->rx_buf;
988 drv_data->rx_end = drv_data->rx + transfer->len;
989 drv_data->rx_dma = transfer->rx_dma;
990 drv_data->tx_dma = transfer->tx_dma;
991 drv_data->len = transfer->len & DCMD_LENGTH;
992 drv_data->write = drv_data->tx ? chip->write : null_writer;
993 drv_data->read = drv_data->rx ? chip->read : null_reader;
995 /* Change speed and bit per word on a per transfer */
997 if (transfer->speed_hz || transfer->bits_per_word) {
999 bits = chip->bits_per_word;
1000 speed = chip->speed_hz;
1002 if (transfer->speed_hz)
1003 speed = transfer->speed_hz;
1005 if (transfer->bits_per_word)
1006 bits = transfer->bits_per_word;
1008 clk_div = ssp_get_clk_div(ssp, speed);
1011 drv_data->n_bytes = 1;
1012 drv_data->dma_width = DCMD_WIDTH1;
1013 drv_data->read = drv_data->read != null_reader ?
1014 u8_reader : null_reader;
1015 drv_data->write = drv_data->write != null_writer ?
1016 u8_writer : null_writer;
1017 } else if (bits <= 16) {
1018 drv_data->n_bytes = 2;
1019 drv_data->dma_width = DCMD_WIDTH2;
1020 drv_data->read = drv_data->read != null_reader ?
1021 u16_reader : null_reader;
1022 drv_data->write = drv_data->write != null_writer ?
1023 u16_writer : null_writer;
1024 } else if (bits <= 32) {
1025 drv_data->n_bytes = 4;
1026 drv_data->dma_width = DCMD_WIDTH4;
1027 drv_data->read = drv_data->read != null_reader ?
1028 u32_reader : null_reader;
1029 drv_data->write = drv_data->write != null_writer ?
1030 u32_writer : null_writer;
1032 /* if bits/word is changed in dma mode, then must check the
1033 * thresholds and burst also */
1034 if (chip->enable_dma) {
1035 if (set_dma_burst_and_threshold(chip, message->spi,
1038 if (printk_ratelimit())
1039 dev_warn(&message->spi->dev,
1041 "DMA burst size reduced to "
1042 "match bits_per_word\n");
1047 | SSCR0_DataSize(bits > 16 ? bits - 16 : bits)
1049 | (bits > 16 ? SSCR0_EDSS : 0);
1052 message->state = RUNNING_STATE;
1054 /* Try to map dma buffer and do a dma transfer if successful, but
1055 * only if the length is non-zero and less than MAX_DMA_LEN.
1057 * Zero-length non-descriptor DMA is illegal on PXA2xx; force use
1058 * of PIO instead. Care is needed above because the transfer may
1059 * have have been passed with buffers that are already dma mapped.
1060 * A zero-length transfer in PIO mode will not try to write/read
1061 * to/from the buffers
1063 * REVISIT large transfers are exactly where we most want to be
1064 * using DMA. If this happens much, split those transfers into
1065 * multiple DMA segments rather than forcing PIO.
1067 drv_data->dma_mapped = 0;
1068 if (drv_data->len > 0 && drv_data->len <= MAX_DMA_LEN)
1069 drv_data->dma_mapped = map_dma_buffers(drv_data);
1070 if (drv_data->dma_mapped) {
1072 /* Ensure we have the correct interrupt handler */
1073 drv_data->transfer_handler = dma_transfer;
1075 /* Setup rx DMA Channel */
1076 DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
1077 DSADR(drv_data->rx_channel) = drv_data->ssdr_physical;
1078 DTADR(drv_data->rx_channel) = drv_data->rx_dma;
1079 if (drv_data->rx == drv_data->null_dma_buf)
1080 /* No target address increment */
1081 DCMD(drv_data->rx_channel) = DCMD_FLOWSRC
1082 | drv_data->dma_width
1086 DCMD(drv_data->rx_channel) = DCMD_INCTRGADDR
1088 | drv_data->dma_width
1092 /* Setup tx DMA Channel */
1093 DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
1094 DSADR(drv_data->tx_channel) = drv_data->tx_dma;
1095 DTADR(drv_data->tx_channel) = drv_data->ssdr_physical;
1096 if (drv_data->tx == drv_data->null_dma_buf)
1097 /* No source address increment */
1098 DCMD(drv_data->tx_channel) = DCMD_FLOWTRG
1099 | drv_data->dma_width
1103 DCMD(drv_data->tx_channel) = DCMD_INCSRCADDR
1105 | drv_data->dma_width
1109 /* Enable dma end irqs on SSP to detect end of transfer */
1110 if (drv_data->ssp_type == PXA25x_SSP)
1111 DCMD(drv_data->tx_channel) |= DCMD_ENDIRQEN;
1113 /* Clear status and start DMA engine */
1114 cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1;
1115 write_SSSR(drv_data->clear_sr, reg);
1116 DCSR(drv_data->rx_channel) |= DCSR_RUN;
1117 DCSR(drv_data->tx_channel) |= DCSR_RUN;
1119 /* Ensure we have the correct interrupt handler */
1120 drv_data->transfer_handler = interrupt_transfer;
1123 cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1;
1124 write_SSSR_CS(drv_data, drv_data->clear_sr);
1127 /* see if we need to reload the config registers */
1128 if ((read_SSCR0(reg) != cr0)
1129 || (read_SSCR1(reg) & SSCR1_CHANGE_MASK) !=
1130 (cr1 & SSCR1_CHANGE_MASK)) {
1132 /* stop the SSP, and update the other bits */
1133 write_SSCR0(cr0 & ~SSCR0_SSE, reg);
1134 if (!pxa25x_ssp_comp(drv_data))
1135 write_SSTO(chip->timeout, reg);
1136 /* first set CR1 without interrupt and service enables */
1137 write_SSCR1(cr1 & SSCR1_CHANGE_MASK, reg);
1138 /* restart the SSP */
1139 write_SSCR0(cr0, reg);
1142 if (!pxa25x_ssp_comp(drv_data))
1143 write_SSTO(chip->timeout, reg);
1146 cs_assert(drv_data);
1148 /* after chip select, release the data by enabling service
1149 * requests and interrupts, without changing any mode bits */
1150 write_SSCR1(cr1, reg);
1153 static int pxa2xx_spi_transfer_one_message(struct spi_master *master,
1154 struct spi_message *msg)
1156 struct driver_data *drv_data = spi_master_get_devdata(master);
1158 drv_data->cur_msg = msg;
1159 /* Initial message state*/
1160 drv_data->cur_msg->state = START_STATE;
1161 drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
1162 struct spi_transfer,
1165 /* prepare to setup the SSP, in pump_transfers, using the per
1166 * chip configuration */
1167 drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
1169 /* Mark as busy and launch transfers */
1170 tasklet_schedule(&drv_data->pump_transfers);
1174 static int setup_cs(struct spi_device *spi, struct chip_data *chip,
1175 struct pxa2xx_spi_chip *chip_info)
1179 if (chip == NULL || chip_info == NULL)
1182 /* NOTE: setup() can be called multiple times, possibly with
1183 * different chip_info, release previously requested GPIO
1185 if (gpio_is_valid(chip->gpio_cs))
1186 gpio_free(chip->gpio_cs);
1188 /* If (*cs_control) is provided, ignore GPIO chip select */
1189 if (chip_info->cs_control) {
1190 chip->cs_control = chip_info->cs_control;
1194 if (gpio_is_valid(chip_info->gpio_cs)) {
1195 err = gpio_request(chip_info->gpio_cs, "SPI_CS");
1197 dev_err(&spi->dev, "failed to request chip select "
1198 "GPIO%d\n", chip_info->gpio_cs);
1202 chip->gpio_cs = chip_info->gpio_cs;
1203 chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
1205 err = gpio_direction_output(chip->gpio_cs,
1206 !chip->gpio_cs_inverted);
1212 static int setup(struct spi_device *spi)
1214 struct pxa2xx_spi_chip *chip_info = NULL;
1215 struct chip_data *chip;
1216 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
1217 struct ssp_device *ssp = drv_data->ssp;
1218 unsigned int clk_div;
1219 uint tx_thres = TX_THRESH_DFLT;
1220 uint rx_thres = RX_THRESH_DFLT;
1222 if (!pxa25x_ssp_comp(drv_data)
1223 && (spi->bits_per_word < 4 || spi->bits_per_word > 32)) {
1224 dev_err(&spi->dev, "failed setup: ssp_type=%d, bits/wrd=%d "
1225 "b/w not 4-32 for type non-PXA25x_SSP\n",
1226 drv_data->ssp_type, spi->bits_per_word);
1228 } else if (pxa25x_ssp_comp(drv_data)
1229 && (spi->bits_per_word < 4
1230 || spi->bits_per_word > 16)) {
1231 dev_err(&spi->dev, "failed setup: ssp_type=%d, bits/wrd=%d "
1232 "b/w not 4-16 for type PXA25x_SSP\n",
1233 drv_data->ssp_type, spi->bits_per_word);
1237 /* Only alloc on first setup */
1238 chip = spi_get_ctldata(spi);
1240 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
1243 "failed setup: can't allocate chip data\n");
1247 if (drv_data->ssp_type == CE4100_SSP) {
1248 if (spi->chip_select > 4) {
1249 dev_err(&spi->dev, "failed setup: "
1250 "cs number must not be > 4.\n");
1255 chip->frm = spi->chip_select;
1258 chip->enable_dma = 0;
1259 chip->timeout = TIMOUT_DFLT;
1260 chip->dma_burst_size = drv_data->master_info->enable_dma ?
1264 /* protocol drivers may change the chip settings, so...
1265 * if chip_info exists, use it */
1266 chip_info = spi->controller_data;
1268 /* chip_info isn't always needed */
1271 if (chip_info->timeout)
1272 chip->timeout = chip_info->timeout;
1273 if (chip_info->tx_threshold)
1274 tx_thres = chip_info->tx_threshold;
1275 if (chip_info->rx_threshold)
1276 rx_thres = chip_info->rx_threshold;
1277 chip->enable_dma = drv_data->master_info->enable_dma;
1278 chip->dma_threshold = 0;
1279 if (chip_info->enable_loopback)
1280 chip->cr1 = SSCR1_LBM;
1283 chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
1284 (SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
1286 /* set dma burst and threshold outside of chip_info path so that if
1287 * chip_info goes away after setting chip->enable_dma, the
1288 * burst and threshold can still respond to changes in bits_per_word */
1289 if (chip->enable_dma) {
1290 /* set up legal burst and threshold for dma */
1291 if (set_dma_burst_and_threshold(chip, spi, spi->bits_per_word,
1292 &chip->dma_burst_size,
1293 &chip->dma_threshold)) {
1294 dev_warn(&spi->dev, "in setup: DMA burst size reduced "
1295 "to match bits_per_word\n");
1299 clk_div = ssp_get_clk_div(ssp, spi->max_speed_hz);
1300 chip->speed_hz = spi->max_speed_hz;
1304 | SSCR0_DataSize(spi->bits_per_word > 16 ?
1305 spi->bits_per_word - 16 : spi->bits_per_word)
1307 | (spi->bits_per_word > 16 ? SSCR0_EDSS : 0);
1308 chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH);
1309 chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)
1310 | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);
1312 /* NOTE: PXA25x_SSP _could_ use external clocking ... */
1313 if (!pxa25x_ssp_comp(drv_data))
1314 dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
1315 clk_get_rate(ssp->clk)
1316 / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)),
1317 chip->enable_dma ? "DMA" : "PIO");
1319 dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
1320 clk_get_rate(ssp->clk) / 2
1321 / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)),
1322 chip->enable_dma ? "DMA" : "PIO");
1324 if (spi->bits_per_word <= 8) {
1326 chip->dma_width = DCMD_WIDTH1;
1327 chip->read = u8_reader;
1328 chip->write = u8_writer;
1329 } else if (spi->bits_per_word <= 16) {
1331 chip->dma_width = DCMD_WIDTH2;
1332 chip->read = u16_reader;
1333 chip->write = u16_writer;
1334 } else if (spi->bits_per_word <= 32) {
1335 chip->cr0 |= SSCR0_EDSS;
1337 chip->dma_width = DCMD_WIDTH4;
1338 chip->read = u32_reader;
1339 chip->write = u32_writer;
1341 dev_err(&spi->dev, "invalid wordsize\n");
1344 chip->bits_per_word = spi->bits_per_word;
1346 spi_set_ctldata(spi, chip);
1348 if (drv_data->ssp_type == CE4100_SSP)
1351 return setup_cs(spi, chip, chip_info);
1354 static void cleanup(struct spi_device *spi)
1356 struct chip_data *chip = spi_get_ctldata(spi);
1357 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
1362 if (drv_data->ssp_type != CE4100_SSP && gpio_is_valid(chip->gpio_cs))
1363 gpio_free(chip->gpio_cs);
1368 static int pxa2xx_spi_probe(struct platform_device *pdev)
1370 struct device *dev = &pdev->dev;
1371 struct pxa2xx_spi_master *platform_info;
1372 struct spi_master *master;
1373 struct driver_data *drv_data;
1374 struct ssp_device *ssp;
1377 platform_info = dev_get_platdata(dev);
1378 if (!platform_info) {
1379 dev_err(&pdev->dev, "missing platform data\n");
1383 ssp = pxa_ssp_request(pdev->id, pdev->name);
1385 ssp = &platform_info->ssp;
1387 if (!ssp->mmio_base) {
1388 dev_err(&pdev->dev, "failed to get ssp\n");
1392 /* Allocate master with space for drv_data and null dma buffer */
1393 master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
1395 dev_err(&pdev->dev, "cannot alloc spi_master\n");
1399 drv_data = spi_master_get_devdata(master);
1400 drv_data->master = master;
1401 drv_data->master_info = platform_info;
1402 drv_data->pdev = pdev;
1403 drv_data->ssp = ssp;
1405 master->dev.parent = &pdev->dev;
1406 master->dev.of_node = pdev->dev.of_node;
1407 /* the spi->mode bits understood by this driver: */
1408 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1410 master->bus_num = ssp->port_id;
1411 master->num_chipselect = platform_info->num_chipselect;
1412 master->dma_alignment = DMA_ALIGNMENT;
1413 master->cleanup = cleanup;
1414 master->setup = setup;
1415 master->transfer_one_message = pxa2xx_spi_transfer_one_message;
1417 drv_data->ssp_type = ssp->type;
1418 drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT);
1420 drv_data->ioaddr = ssp->mmio_base;
1421 drv_data->ssdr_physical = ssp->phys_base + SSDR;
1422 if (pxa25x_ssp_comp(drv_data)) {
1423 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
1424 drv_data->dma_cr1 = 0;
1425 drv_data->clear_sr = SSSR_ROR;
1426 drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
1428 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
1429 drv_data->dma_cr1 = SSCR1_TSRE | SSCR1_RSRE | SSCR1_TINTE;
1430 drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
1431 drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
1434 status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev),
1437 dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq);
1438 goto out_error_master_alloc;
1441 /* Setup DMA if requested */
1442 drv_data->tx_channel = -1;
1443 drv_data->rx_channel = -1;
1444 if (platform_info->enable_dma) {
1446 /* Get two DMA channels (rx and tx) */
1447 drv_data->rx_channel = pxa_request_dma("pxa2xx_spi_ssp_rx",
1451 if (drv_data->rx_channel < 0) {
1452 dev_err(dev, "problem (%d) requesting rx channel\n",
1453 drv_data->rx_channel);
1455 goto out_error_irq_alloc;
1457 drv_data->tx_channel = pxa_request_dma("pxa2xx_spi_ssp_tx",
1461 if (drv_data->tx_channel < 0) {
1462 dev_err(dev, "problem (%d) requesting tx channel\n",
1463 drv_data->tx_channel);
1465 goto out_error_dma_alloc;
1468 DRCMR(ssp->drcmr_rx) = DRCMR_MAPVLD | drv_data->rx_channel;
1469 DRCMR(ssp->drcmr_tx) = DRCMR_MAPVLD | drv_data->tx_channel;
1472 /* Enable SOC clock */
1473 clk_enable(ssp->clk);
1475 /* Load default SSP configuration */
1476 write_SSCR0(0, drv_data->ioaddr);
1477 write_SSCR1(SSCR1_RxTresh(RX_THRESH_DFLT) |
1478 SSCR1_TxTresh(TX_THRESH_DFLT),
1480 write_SSCR0(SSCR0_SCR(2)
1482 | SSCR0_DataSize(8),
1484 if (!pxa25x_ssp_comp(drv_data))
1485 write_SSTO(0, drv_data->ioaddr);
1486 write_SSPSP(0, drv_data->ioaddr);
1488 tasklet_init(&drv_data->pump_transfers, pump_transfers,
1489 (unsigned long)drv_data);
1491 /* Register with the SPI framework */
1492 platform_set_drvdata(pdev, drv_data);
1493 status = spi_register_master(master);
1495 dev_err(&pdev->dev, "problem registering spi master\n");
1496 goto out_error_clock_enabled;
1501 out_error_clock_enabled:
1502 clk_disable(ssp->clk);
1504 out_error_dma_alloc:
1505 if (drv_data->tx_channel != -1)
1506 pxa_free_dma(drv_data->tx_channel);
1507 if (drv_data->rx_channel != -1)
1508 pxa_free_dma(drv_data->rx_channel);
1510 out_error_irq_alloc:
1511 free_irq(ssp->irq, drv_data);
1513 out_error_master_alloc:
1514 spi_master_put(master);
1519 static int pxa2xx_spi_remove(struct platform_device *pdev)
1521 struct driver_data *drv_data = platform_get_drvdata(pdev);
1522 struct ssp_device *ssp;
1526 ssp = drv_data->ssp;
1528 /* Disable the SSP at the peripheral and SOC level */
1529 write_SSCR0(0, drv_data->ioaddr);
1530 clk_disable(ssp->clk);
1533 if (drv_data->master_info->enable_dma) {
1534 DRCMR(ssp->drcmr_rx) = 0;
1535 DRCMR(ssp->drcmr_tx) = 0;
1536 pxa_free_dma(drv_data->tx_channel);
1537 pxa_free_dma(drv_data->rx_channel);
1541 free_irq(ssp->irq, drv_data);
1546 /* Disconnect from the SPI framework */
1547 spi_unregister_master(drv_data->master);
1549 /* Prevent double remove */
1550 platform_set_drvdata(pdev, NULL);
1555 static void pxa2xx_spi_shutdown(struct platform_device *pdev)
1559 if ((status = pxa2xx_spi_remove(pdev)) != 0)
1560 dev_err(&pdev->dev, "shutdown failed with %d\n", status);
1564 static int pxa2xx_spi_suspend(struct device *dev)
1566 struct driver_data *drv_data = dev_get_drvdata(dev);
1567 struct ssp_device *ssp = drv_data->ssp;
1570 status = spi_master_suspend(drv_data->master);
1573 write_SSCR0(0, drv_data->ioaddr);
1574 clk_disable(ssp->clk);
1579 static int pxa2xx_spi_resume(struct device *dev)
1581 struct driver_data *drv_data = dev_get_drvdata(dev);
1582 struct ssp_device *ssp = drv_data->ssp;
1585 if (drv_data->rx_channel != -1)
1586 DRCMR(drv_data->ssp->drcmr_rx) =
1587 DRCMR_MAPVLD | drv_data->rx_channel;
1588 if (drv_data->tx_channel != -1)
1589 DRCMR(drv_data->ssp->drcmr_tx) =
1590 DRCMR_MAPVLD | drv_data->tx_channel;
1592 /* Enable the SSP clock */
1593 clk_enable(ssp->clk);
1595 /* Start the queue running */
1596 status = spi_master_resume(drv_data->master);
1598 dev_err(dev, "problem starting queue (%d)\n", status);
1605 static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
1606 .suspend = pxa2xx_spi_suspend,
1607 .resume = pxa2xx_spi_resume,
1611 static struct platform_driver driver = {
1613 .name = "pxa2xx-spi",
1614 .owner = THIS_MODULE,
1616 .pm = &pxa2xx_spi_pm_ops,
1619 .probe = pxa2xx_spi_probe,
1620 .remove = pxa2xx_spi_remove,
1621 .shutdown = pxa2xx_spi_shutdown,
1624 static int __init pxa2xx_spi_init(void)
1626 return platform_driver_register(&driver);
1628 subsys_initcall(pxa2xx_spi_init);
1630 static void __exit pxa2xx_spi_exit(void)
1632 platform_driver_unregister(&driver);
1634 module_exit(pxa2xx_spi_exit);