2 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
3 * Copyright (C) 2013, Intel Corporation
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/device.h>
19 #include <linux/ioport.h>
20 #include <linux/errno.h>
21 #include <linux/err.h>
22 #include <linux/interrupt.h>
23 #include <linux/kernel.h>
24 #include <linux/platform_device.h>
25 #include <linux/spi/pxa2xx_spi.h>
26 #include <linux/spi/spi.h>
27 #include <linux/delay.h>
28 #include <linux/gpio.h>
29 #include <linux/slab.h>
30 #include <linux/clk.h>
31 #include <linux/pm_runtime.h>
32 #include <linux/acpi.h>
34 #include "spi-pxa2xx.h"
36 MODULE_AUTHOR("Stephen Street");
37 MODULE_DESCRIPTION("PXA2xx SSP SPI Controller");
38 MODULE_LICENSE("GPL");
39 MODULE_ALIAS("platform:pxa2xx-spi");
41 #define TIMOUT_DFLT 1000
44 * for testing SSCR1 changes that require SSP restart, basically
45 * everything except the service and interrupt enables, the pxa270 developer
46 * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this
47 * list, but the PXA255 dev man says all bits without really meaning the
48 * service and interrupt enables
50 #define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \
51 | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \
52 | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \
53 | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \
54 | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \
55 | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
57 #define QUARK_X1000_SSCR1_CHANGE_MASK (QUARK_X1000_SSCR1_STRF \
58 | QUARK_X1000_SSCR1_EFWR \
59 | QUARK_X1000_SSCR1_RFT \
60 | QUARK_X1000_SSCR1_TFT \
61 | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
63 #define GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24)
64 #define SPI_CS_CONTROL_SW_MODE BIT(0)
65 #define SPI_CS_CONTROL_CS_HIGH BIT(1)
68 /* LPSS offset from drv_data->ioaddr */
70 /* Register offsets from drv_data->lpss_base or -1 */
80 /* Keep these sorted with enum pxa_ssp_type */
81 static const struct lpss_config lpss_platforms[] = {
88 .tx_threshold_lo = 160,
89 .tx_threshold_hi = 224,
97 .tx_threshold_lo = 160,
98 .tx_threshold_hi = 224,
102 static inline const struct lpss_config
103 *lpss_get_config(const struct driver_data *drv_data)
105 return &lpss_platforms[drv_data->ssp_type - LPSS_LPT_SSP];
108 static bool is_lpss_ssp(const struct driver_data *drv_data)
110 switch (drv_data->ssp_type) {
119 static bool is_quark_x1000_ssp(const struct driver_data *drv_data)
121 return drv_data->ssp_type == QUARK_X1000_SSP;
124 static u32 pxa2xx_spi_get_ssrc1_change_mask(const struct driver_data *drv_data)
126 switch (drv_data->ssp_type) {
127 case QUARK_X1000_SSP:
128 return QUARK_X1000_SSCR1_CHANGE_MASK;
130 return SSCR1_CHANGE_MASK;
135 pxa2xx_spi_get_rx_default_thre(const struct driver_data *drv_data)
137 switch (drv_data->ssp_type) {
138 case QUARK_X1000_SSP:
139 return RX_THRESH_QUARK_X1000_DFLT;
141 return RX_THRESH_DFLT;
145 static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data)
149 switch (drv_data->ssp_type) {
150 case QUARK_X1000_SSP:
151 mask = QUARK_X1000_SSSR_TFL_MASK;
154 mask = SSSR_TFL_MASK;
158 return (pxa2xx_spi_read(drv_data, SSSR) & mask) == mask;
161 static void pxa2xx_spi_clear_rx_thre(const struct driver_data *drv_data,
166 switch (drv_data->ssp_type) {
167 case QUARK_X1000_SSP:
168 mask = QUARK_X1000_SSCR1_RFT;
177 static void pxa2xx_spi_set_rx_thre(const struct driver_data *drv_data,
178 u32 *sccr1_reg, u32 threshold)
180 switch (drv_data->ssp_type) {
181 case QUARK_X1000_SSP:
182 *sccr1_reg |= QUARK_X1000_SSCR1_RxTresh(threshold);
185 *sccr1_reg |= SSCR1_RxTresh(threshold);
190 static u32 pxa2xx_configure_sscr0(const struct driver_data *drv_data,
191 u32 clk_div, u8 bits)
193 switch (drv_data->ssp_type) {
194 case QUARK_X1000_SSP:
196 | QUARK_X1000_SSCR0_Motorola
197 | QUARK_X1000_SSCR0_DataSize(bits > 32 ? 8 : bits)
202 | SSCR0_DataSize(bits > 16 ? bits - 16 : bits)
204 | (bits > 16 ? SSCR0_EDSS : 0);
209 * Read and write LPSS SSP private registers. Caller must first check that
210 * is_lpss_ssp() returns true before these can be called.
212 static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned offset)
214 WARN_ON(!drv_data->lpss_base);
215 return readl(drv_data->lpss_base + offset);
218 static void __lpss_ssp_write_priv(struct driver_data *drv_data,
219 unsigned offset, u32 value)
221 WARN_ON(!drv_data->lpss_base);
222 writel(value, drv_data->lpss_base + offset);
226 * lpss_ssp_setup - perform LPSS SSP specific setup
227 * @drv_data: pointer to the driver private data
229 * Perform LPSS SSP specific setup. This function must be called first if
230 * one is going to use LPSS SSP private registers.
232 static void lpss_ssp_setup(struct driver_data *drv_data)
234 const struct lpss_config *config;
237 config = lpss_get_config(drv_data);
238 drv_data->lpss_base = drv_data->ioaddr + config->offset;
240 /* Enable software chip select control */
241 value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH;
242 __lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
244 /* Enable multiblock DMA transfers */
245 if (drv_data->master_info->enable_dma) {
246 __lpss_ssp_write_priv(drv_data, config->reg_ssp, 1);
248 value = __lpss_ssp_read_priv(drv_data, config->reg_general);
249 value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE;
250 __lpss_ssp_write_priv(drv_data, config->reg_general, value);
254 static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable)
256 const struct lpss_config *config;
259 config = lpss_get_config(drv_data);
261 value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl);
263 value &= ~SPI_CS_CONTROL_CS_HIGH;
265 value |= SPI_CS_CONTROL_CS_HIGH;
266 __lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
269 static void cs_assert(struct driver_data *drv_data)
271 struct chip_data *chip = drv_data->cur_chip;
273 if (drv_data->ssp_type == CE4100_SSP) {
274 pxa2xx_spi_write(drv_data, SSSR, drv_data->cur_chip->frm);
278 if (chip->cs_control) {
279 chip->cs_control(PXA2XX_CS_ASSERT);
283 if (gpio_is_valid(chip->gpio_cs)) {
284 gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted);
288 if (is_lpss_ssp(drv_data))
289 lpss_ssp_cs_control(drv_data, true);
292 static void cs_deassert(struct driver_data *drv_data)
294 struct chip_data *chip = drv_data->cur_chip;
296 if (drv_data->ssp_type == CE4100_SSP)
299 if (chip->cs_control) {
300 chip->cs_control(PXA2XX_CS_DEASSERT);
304 if (gpio_is_valid(chip->gpio_cs)) {
305 gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted);
309 if (is_lpss_ssp(drv_data))
310 lpss_ssp_cs_control(drv_data, false);
313 int pxa2xx_spi_flush(struct driver_data *drv_data)
315 unsigned long limit = loops_per_jiffy << 1;
318 while (pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
319 pxa2xx_spi_read(drv_data, SSDR);
320 } while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_BSY) && --limit);
321 write_SSSR_CS(drv_data, SSSR_ROR);
326 static int null_writer(struct driver_data *drv_data)
328 u8 n_bytes = drv_data->n_bytes;
330 if (pxa2xx_spi_txfifo_full(drv_data)
331 || (drv_data->tx == drv_data->tx_end))
334 pxa2xx_spi_write(drv_data, SSDR, 0);
335 drv_data->tx += n_bytes;
340 static int null_reader(struct driver_data *drv_data)
342 u8 n_bytes = drv_data->n_bytes;
344 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
345 && (drv_data->rx < drv_data->rx_end)) {
346 pxa2xx_spi_read(drv_data, SSDR);
347 drv_data->rx += n_bytes;
350 return drv_data->rx == drv_data->rx_end;
353 static int u8_writer(struct driver_data *drv_data)
355 if (pxa2xx_spi_txfifo_full(drv_data)
356 || (drv_data->tx == drv_data->tx_end))
359 pxa2xx_spi_write(drv_data, SSDR, *(u8 *)(drv_data->tx));
365 static int u8_reader(struct driver_data *drv_data)
367 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
368 && (drv_data->rx < drv_data->rx_end)) {
369 *(u8 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
373 return drv_data->rx == drv_data->rx_end;
376 static int u16_writer(struct driver_data *drv_data)
378 if (pxa2xx_spi_txfifo_full(drv_data)
379 || (drv_data->tx == drv_data->tx_end))
382 pxa2xx_spi_write(drv_data, SSDR, *(u16 *)(drv_data->tx));
388 static int u16_reader(struct driver_data *drv_data)
390 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
391 && (drv_data->rx < drv_data->rx_end)) {
392 *(u16 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
396 return drv_data->rx == drv_data->rx_end;
399 static int u32_writer(struct driver_data *drv_data)
401 if (pxa2xx_spi_txfifo_full(drv_data)
402 || (drv_data->tx == drv_data->tx_end))
405 pxa2xx_spi_write(drv_data, SSDR, *(u32 *)(drv_data->tx));
411 static int u32_reader(struct driver_data *drv_data)
413 while ((pxa2xx_spi_read(drv_data, SSSR) & SSSR_RNE)
414 && (drv_data->rx < drv_data->rx_end)) {
415 *(u32 *)(drv_data->rx) = pxa2xx_spi_read(drv_data, SSDR);
419 return drv_data->rx == drv_data->rx_end;
422 void *pxa2xx_spi_next_transfer(struct driver_data *drv_data)
424 struct spi_message *msg = drv_data->cur_msg;
425 struct spi_transfer *trans = drv_data->cur_transfer;
427 /* Move to next transfer */
428 if (trans->transfer_list.next != &msg->transfers) {
429 drv_data->cur_transfer =
430 list_entry(trans->transfer_list.next,
433 return RUNNING_STATE;
438 /* caller already set message->status; dma and pio irqs are blocked */
439 static void giveback(struct driver_data *drv_data)
441 struct spi_transfer* last_transfer;
442 struct spi_message *msg;
444 msg = drv_data->cur_msg;
445 drv_data->cur_msg = NULL;
446 drv_data->cur_transfer = NULL;
448 last_transfer = list_last_entry(&msg->transfers, struct spi_transfer,
451 /* Delay if requested before any change in chip select */
452 if (last_transfer->delay_usecs)
453 udelay(last_transfer->delay_usecs);
455 /* Drop chip select UNLESS cs_change is true or we are returning
456 * a message with an error, or next message is for another chip
458 if (!last_transfer->cs_change)
459 cs_deassert(drv_data);
461 struct spi_message *next_msg;
463 /* Holding of cs was hinted, but we need to make sure
464 * the next message is for the same chip. Don't waste
465 * time with the following tests unless this was hinted.
467 * We cannot postpone this until pump_messages, because
468 * after calling msg->complete (below) the driver that
469 * sent the current message could be unloaded, which
470 * could invalidate the cs_control() callback...
473 /* get a pointer to the next message, if any */
474 next_msg = spi_get_next_queued_message(drv_data->master);
476 /* see if the next and current messages point
479 if (next_msg && next_msg->spi != msg->spi)
481 if (!next_msg || msg->state == ERROR_STATE)
482 cs_deassert(drv_data);
485 drv_data->cur_chip = NULL;
486 spi_finalize_current_message(drv_data->master);
489 static void reset_sccr1(struct driver_data *drv_data)
491 struct chip_data *chip = drv_data->cur_chip;
494 sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1) & ~drv_data->int_cr1;
495 sccr1_reg &= ~SSCR1_RFT;
496 sccr1_reg |= chip->threshold;
497 pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg);
500 static void int_error_stop(struct driver_data *drv_data, const char* msg)
502 /* Stop and reset SSP */
503 write_SSSR_CS(drv_data, drv_data->clear_sr);
504 reset_sccr1(drv_data);
505 if (!pxa25x_ssp_comp(drv_data))
506 pxa2xx_spi_write(drv_data, SSTO, 0);
507 pxa2xx_spi_flush(drv_data);
508 pxa2xx_spi_write(drv_data, SSCR0,
509 pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE);
511 dev_err(&drv_data->pdev->dev, "%s\n", msg);
513 drv_data->cur_msg->state = ERROR_STATE;
514 tasklet_schedule(&drv_data->pump_transfers);
517 static void int_transfer_complete(struct driver_data *drv_data)
520 write_SSSR_CS(drv_data, drv_data->clear_sr);
521 reset_sccr1(drv_data);
522 if (!pxa25x_ssp_comp(drv_data))
523 pxa2xx_spi_write(drv_data, SSTO, 0);
525 /* Update total byte transferred return count actual bytes read */
526 drv_data->cur_msg->actual_length += drv_data->len -
527 (drv_data->rx_end - drv_data->rx);
529 /* Transfer delays and chip select release are
530 * handled in pump_transfers or giveback
533 /* Move to next transfer */
534 drv_data->cur_msg->state = pxa2xx_spi_next_transfer(drv_data);
536 /* Schedule transfer tasklet */
537 tasklet_schedule(&drv_data->pump_transfers);
540 static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
542 u32 irq_mask = (pxa2xx_spi_read(drv_data, SSCR1) & SSCR1_TIE) ?
543 drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS;
545 u32 irq_status = pxa2xx_spi_read(drv_data, SSSR) & irq_mask;
547 if (irq_status & SSSR_ROR) {
548 int_error_stop(drv_data, "interrupt_transfer: fifo overrun");
552 if (irq_status & SSSR_TINT) {
553 pxa2xx_spi_write(drv_data, SSSR, SSSR_TINT);
554 if (drv_data->read(drv_data)) {
555 int_transfer_complete(drv_data);
560 /* Drain rx fifo, Fill tx fifo and prevent overruns */
562 if (drv_data->read(drv_data)) {
563 int_transfer_complete(drv_data);
566 } while (drv_data->write(drv_data));
568 if (drv_data->read(drv_data)) {
569 int_transfer_complete(drv_data);
573 if (drv_data->tx == drv_data->tx_end) {
577 sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1);
578 sccr1_reg &= ~SSCR1_TIE;
581 * PXA25x_SSP has no timeout, set up rx threshould for the
582 * remaining RX bytes.
584 if (pxa25x_ssp_comp(drv_data)) {
587 pxa2xx_spi_clear_rx_thre(drv_data, &sccr1_reg);
589 bytes_left = drv_data->rx_end - drv_data->rx;
590 switch (drv_data->n_bytes) {
597 rx_thre = pxa2xx_spi_get_rx_default_thre(drv_data);
598 if (rx_thre > bytes_left)
599 rx_thre = bytes_left;
601 pxa2xx_spi_set_rx_thre(drv_data, &sccr1_reg, rx_thre);
603 pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg);
606 /* We did something */
610 static irqreturn_t ssp_int(int irq, void *dev_id)
612 struct driver_data *drv_data = dev_id;
614 u32 mask = drv_data->mask_sr;
618 * The IRQ might be shared with other peripherals so we must first
619 * check that are we RPM suspended or not. If we are we assume that
620 * the IRQ was not for us (we shouldn't be RPM suspended when the
621 * interrupt is enabled).
623 if (pm_runtime_suspended(&drv_data->pdev->dev))
627 * If the device is not yet in RPM suspended state and we get an
628 * interrupt that is meant for another device, check if status bits
629 * are all set to one. That means that the device is already
632 status = pxa2xx_spi_read(drv_data, SSSR);
636 sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1);
638 /* Ignore possible writes if we don't need to write */
639 if (!(sccr1_reg & SSCR1_TIE))
642 if (!(status & mask))
645 if (!drv_data->cur_msg) {
647 pxa2xx_spi_write(drv_data, SSCR0,
648 pxa2xx_spi_read(drv_data, SSCR0)
650 pxa2xx_spi_write(drv_data, SSCR1,
651 pxa2xx_spi_read(drv_data, SSCR1)
652 & ~drv_data->int_cr1);
653 if (!pxa25x_ssp_comp(drv_data))
654 pxa2xx_spi_write(drv_data, SSTO, 0);
655 write_SSSR_CS(drv_data, drv_data->clear_sr);
657 dev_err(&drv_data->pdev->dev,
658 "bad message state in interrupt handler\n");
664 return drv_data->transfer_handler(drv_data);
668 * The Quark SPI has an additional 24 bit register (DDS_CLK_RATE) to multiply
669 * input frequency by fractions of 2^24. It also has a divider by 5.
671 * There are formulas to get baud rate value for given input frequency and
672 * divider parameters, such as DDS_CLK_RATE and SCR:
676 * Fssp = Fsys * DDS_CLK_RATE / 2^24 (1)
677 * Baud rate = Fsclk = Fssp / (2 * (SCR + 1)) (2)
679 * DDS_CLK_RATE either 2^n or 2^n / 5.
680 * SCR is in range 0 .. 255
682 * Divisor = 5^i * 2^j * 2 * k
683 * i = [0, 1] i = 1 iff j = 0 or j > 3
684 * j = [0, 23] j = 0 iff i = 1
686 * Special case: j = 0, i = 1: Divisor = 2 / 5
688 * Accordingly to the specification the recommended values for DDS_CLK_RATE
690 * Case 1: 2^n, n = [0, 23]
691 * Case 2: 2^24 * 2 / 5 (0x666666)
692 * Case 3: less than or equal to 2^24 / 5 / 16 (0x33333)
694 * In all cases the lowest possible value is better.
696 * The function calculates parameters for all cases and chooses the one closest
697 * to the asked baud rate.
699 static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds)
701 unsigned long xtal = 200000000;
702 unsigned long fref = xtal / 2; /* mandatory division by 2,
705 unsigned long fref1 = fref / 2; /* case 1 */
706 unsigned long fref2 = fref * 2 / 5; /* case 2 */
708 unsigned long q, q1, q2;
714 /* Set initial value for DDS_CLK_RATE */
715 mul = (1 << 24) >> 1;
717 /* Calculate initial quot */
718 q1 = DIV_ROUND_CLOSEST(fref1, rate);
720 /* Scale q1 if it's too big */
722 /* Scale q1 to range [1, 512] */
723 scale = fls_long(q1 - 1);
729 /* Round the result if we have a remainder */
733 /* Decrease DDS_CLK_RATE as much as we can without loss in precision */
738 /* Get the remainder */
739 r1 = abs(fref1 / (1 << (24 - fls_long(mul))) / q1 - rate);
743 q2 = DIV_ROUND_CLOSEST(fref2, rate);
744 r2 = abs(fref2 / q2 - rate);
747 * Choose the best between two: less remainder we have the better. We
748 * can't go case 2 if q2 is greater than 256 since SCR register can
749 * hold only values 0 .. 255.
751 if (r2 >= r1 || q2 > 256) {
752 /* case 1 is better */
756 /* case 2 is better */
759 mul = (1 << 24) * 2 / 5;
762 /* Check case 3 only If the divisor is big enough */
763 if (fref / rate >= 80) {
767 /* Calculate initial quot */
768 q1 = DIV_ROUND_CLOSEST(fref, rate);
771 /* Get the remainder */
772 fssp = (u64)fref * m;
773 do_div(fssp, 1 << 24);
774 r1 = abs(fssp - rate);
776 /* Choose this one if it suits better */
778 /* case 3 is better */
788 static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
790 unsigned long ssp_clk = drv_data->max_clk_rate;
791 const struct ssp_device *ssp = drv_data->ssp;
793 rate = min_t(int, ssp_clk, rate);
795 if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
796 return (ssp_clk / (2 * rate) - 1) & 0xff;
798 return (ssp_clk / rate - 1) & 0xfff;
801 static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
802 struct chip_data *chip, int rate)
804 unsigned int clk_div;
806 switch (drv_data->ssp_type) {
807 case QUARK_X1000_SSP:
808 clk_div = quark_x1000_get_clk_div(rate, &chip->dds_rate);
811 clk_div = ssp_get_clk_div(drv_data, rate);
817 static void pump_transfers(unsigned long data)
819 struct driver_data *drv_data = (struct driver_data *)data;
820 struct spi_message *message = NULL;
821 struct spi_transfer *transfer = NULL;
822 struct spi_transfer *previous = NULL;
823 struct chip_data *chip = NULL;
829 u32 dma_thresh = drv_data->cur_chip->dma_threshold;
830 u32 dma_burst = drv_data->cur_chip->dma_burst_size;
831 u32 change_mask = pxa2xx_spi_get_ssrc1_change_mask(drv_data);
833 /* Get current state information */
834 message = drv_data->cur_msg;
835 transfer = drv_data->cur_transfer;
836 chip = drv_data->cur_chip;
838 /* Handle for abort */
839 if (message->state == ERROR_STATE) {
840 message->status = -EIO;
845 /* Handle end of message */
846 if (message->state == DONE_STATE) {
852 /* Delay if requested at end of transfer before CS change */
853 if (message->state == RUNNING_STATE) {
854 previous = list_entry(transfer->transfer_list.prev,
857 if (previous->delay_usecs)
858 udelay(previous->delay_usecs);
860 /* Drop chip select only if cs_change is requested */
861 if (previous->cs_change)
862 cs_deassert(drv_data);
865 /* Check if we can DMA this transfer */
866 if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip->enable_dma) {
868 /* reject already-mapped transfers; PIO won't always work */
869 if (message->is_dma_mapped
870 || transfer->rx_dma || transfer->tx_dma) {
871 dev_err(&drv_data->pdev->dev,
872 "pump_transfers: mapped transfer length of "
873 "%u is greater than %d\n",
874 transfer->len, MAX_DMA_LEN);
875 message->status = -EINVAL;
880 /* warn ... we force this to PIO mode */
881 dev_warn_ratelimited(&message->spi->dev,
882 "pump_transfers: DMA disabled for transfer length %ld "
884 (long)drv_data->len, MAX_DMA_LEN);
887 /* Setup the transfer state based on the type of transfer */
888 if (pxa2xx_spi_flush(drv_data) == 0) {
889 dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
890 message->status = -EIO;
894 drv_data->n_bytes = chip->n_bytes;
895 drv_data->tx = (void *)transfer->tx_buf;
896 drv_data->tx_end = drv_data->tx + transfer->len;
897 drv_data->rx = transfer->rx_buf;
898 drv_data->rx_end = drv_data->rx + transfer->len;
899 drv_data->rx_dma = transfer->rx_dma;
900 drv_data->tx_dma = transfer->tx_dma;
901 drv_data->len = transfer->len;
902 drv_data->write = drv_data->tx ? chip->write : null_writer;
903 drv_data->read = drv_data->rx ? chip->read : null_reader;
905 /* Change speed and bit per word on a per transfer */
907 if (transfer->speed_hz || transfer->bits_per_word) {
909 bits = chip->bits_per_word;
910 speed = chip->speed_hz;
912 if (transfer->speed_hz)
913 speed = transfer->speed_hz;
915 if (transfer->bits_per_word)
916 bits = transfer->bits_per_word;
918 clk_div = pxa2xx_ssp_get_clk_div(drv_data, chip, speed);
921 drv_data->n_bytes = 1;
922 drv_data->read = drv_data->read != null_reader ?
923 u8_reader : null_reader;
924 drv_data->write = drv_data->write != null_writer ?
925 u8_writer : null_writer;
926 } else if (bits <= 16) {
927 drv_data->n_bytes = 2;
928 drv_data->read = drv_data->read != null_reader ?
929 u16_reader : null_reader;
930 drv_data->write = drv_data->write != null_writer ?
931 u16_writer : null_writer;
932 } else if (bits <= 32) {
933 drv_data->n_bytes = 4;
934 drv_data->read = drv_data->read != null_reader ?
935 u32_reader : null_reader;
936 drv_data->write = drv_data->write != null_writer ?
937 u32_writer : null_writer;
939 /* if bits/word is changed in dma mode, then must check the
940 * thresholds and burst also */
941 if (chip->enable_dma) {
942 if (pxa2xx_spi_set_dma_burst_and_threshold(chip,
946 dev_warn_ratelimited(&message->spi->dev,
947 "pump_transfers: DMA burst size reduced to match bits_per_word\n");
950 cr0 = pxa2xx_configure_sscr0(drv_data, clk_div, bits);
953 message->state = RUNNING_STATE;
955 drv_data->dma_mapped = 0;
956 if (pxa2xx_spi_dma_is_possible(drv_data->len))
957 drv_data->dma_mapped = pxa2xx_spi_map_dma_buffers(drv_data);
958 if (drv_data->dma_mapped) {
960 /* Ensure we have the correct interrupt handler */
961 drv_data->transfer_handler = pxa2xx_spi_dma_transfer;
963 pxa2xx_spi_dma_prepare(drv_data, dma_burst);
965 /* Clear status and start DMA engine */
966 cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1;
967 pxa2xx_spi_write(drv_data, SSSR, drv_data->clear_sr);
969 pxa2xx_spi_dma_start(drv_data);
971 /* Ensure we have the correct interrupt handler */
972 drv_data->transfer_handler = interrupt_transfer;
975 cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1;
976 write_SSSR_CS(drv_data, drv_data->clear_sr);
979 if (is_lpss_ssp(drv_data)) {
980 if ((pxa2xx_spi_read(drv_data, SSIRF) & 0xff)
981 != chip->lpss_rx_threshold)
982 pxa2xx_spi_write(drv_data, SSIRF,
983 chip->lpss_rx_threshold);
984 if ((pxa2xx_spi_read(drv_data, SSITF) & 0xffff)
985 != chip->lpss_tx_threshold)
986 pxa2xx_spi_write(drv_data, SSITF,
987 chip->lpss_tx_threshold);
990 if (is_quark_x1000_ssp(drv_data) &&
991 (pxa2xx_spi_read(drv_data, DDS_RATE) != chip->dds_rate))
992 pxa2xx_spi_write(drv_data, DDS_RATE, chip->dds_rate);
994 /* see if we need to reload the config registers */
995 if ((pxa2xx_spi_read(drv_data, SSCR0) != cr0)
996 || (pxa2xx_spi_read(drv_data, SSCR1) & change_mask)
997 != (cr1 & change_mask)) {
998 /* stop the SSP, and update the other bits */
999 pxa2xx_spi_write(drv_data, SSCR0, cr0 & ~SSCR0_SSE);
1000 if (!pxa25x_ssp_comp(drv_data))
1001 pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
1002 /* first set CR1 without interrupt and service enables */
1003 pxa2xx_spi_write(drv_data, SSCR1, cr1 & change_mask);
1004 /* restart the SSP */
1005 pxa2xx_spi_write(drv_data, SSCR0, cr0);
1008 if (!pxa25x_ssp_comp(drv_data))
1009 pxa2xx_spi_write(drv_data, SSTO, chip->timeout);
1012 cs_assert(drv_data);
1014 /* after chip select, release the data by enabling service
1015 * requests and interrupts, without changing any mode bits */
1016 pxa2xx_spi_write(drv_data, SSCR1, cr1);
1019 static int pxa2xx_spi_transfer_one_message(struct spi_master *master,
1020 struct spi_message *msg)
1022 struct driver_data *drv_data = spi_master_get_devdata(master);
1024 drv_data->cur_msg = msg;
1025 /* Initial message state*/
1026 drv_data->cur_msg->state = START_STATE;
1027 drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
1028 struct spi_transfer,
1031 /* prepare to setup the SSP, in pump_transfers, using the per
1032 * chip configuration */
1033 drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
1035 /* Mark as busy and launch transfers */
1036 tasklet_schedule(&drv_data->pump_transfers);
1040 static int pxa2xx_spi_unprepare_transfer(struct spi_master *master)
1042 struct driver_data *drv_data = spi_master_get_devdata(master);
1044 /* Disable the SSP now */
1045 pxa2xx_spi_write(drv_data, SSCR0,
1046 pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE);
1051 static int setup_cs(struct spi_device *spi, struct chip_data *chip,
1052 struct pxa2xx_spi_chip *chip_info)
1056 if (chip == NULL || chip_info == NULL)
1059 /* NOTE: setup() can be called multiple times, possibly with
1060 * different chip_info, release previously requested GPIO
1062 if (gpio_is_valid(chip->gpio_cs))
1063 gpio_free(chip->gpio_cs);
1065 /* If (*cs_control) is provided, ignore GPIO chip select */
1066 if (chip_info->cs_control) {
1067 chip->cs_control = chip_info->cs_control;
1071 if (gpio_is_valid(chip_info->gpio_cs)) {
1072 err = gpio_request(chip_info->gpio_cs, "SPI_CS");
1074 dev_err(&spi->dev, "failed to request chip select GPIO%d\n",
1075 chip_info->gpio_cs);
1079 chip->gpio_cs = chip_info->gpio_cs;
1080 chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH;
1082 err = gpio_direction_output(chip->gpio_cs,
1083 !chip->gpio_cs_inverted);
1089 static int setup(struct spi_device *spi)
1091 struct pxa2xx_spi_chip *chip_info = NULL;
1092 struct chip_data *chip;
1093 const struct lpss_config *config;
1094 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
1095 unsigned int clk_div;
1096 uint tx_thres, tx_hi_thres, rx_thres;
1098 switch (drv_data->ssp_type) {
1099 case QUARK_X1000_SSP:
1100 tx_thres = TX_THRESH_QUARK_X1000_DFLT;
1102 rx_thres = RX_THRESH_QUARK_X1000_DFLT;
1106 config = lpss_get_config(drv_data);
1107 tx_thres = config->tx_threshold_lo;
1108 tx_hi_thres = config->tx_threshold_hi;
1109 rx_thres = config->rx_threshold;
1112 tx_thres = TX_THRESH_DFLT;
1114 rx_thres = RX_THRESH_DFLT;
1118 /* Only alloc on first setup */
1119 chip = spi_get_ctldata(spi);
1121 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
1125 if (drv_data->ssp_type == CE4100_SSP) {
1126 if (spi->chip_select > 4) {
1128 "failed setup: cs number must not be > 4.\n");
1133 chip->frm = spi->chip_select;
1136 chip->enable_dma = 0;
1137 chip->timeout = TIMOUT_DFLT;
1140 /* protocol drivers may change the chip settings, so...
1141 * if chip_info exists, use it */
1142 chip_info = spi->controller_data;
1144 /* chip_info isn't always needed */
1147 if (chip_info->timeout)
1148 chip->timeout = chip_info->timeout;
1149 if (chip_info->tx_threshold)
1150 tx_thres = chip_info->tx_threshold;
1151 if (chip_info->tx_hi_threshold)
1152 tx_hi_thres = chip_info->tx_hi_threshold;
1153 if (chip_info->rx_threshold)
1154 rx_thres = chip_info->rx_threshold;
1155 chip->enable_dma = drv_data->master_info->enable_dma;
1156 chip->dma_threshold = 0;
1157 if (chip_info->enable_loopback)
1158 chip->cr1 = SSCR1_LBM;
1159 } else if (ACPI_HANDLE(&spi->dev)) {
1161 * Slave devices enumerated from ACPI namespace don't
1162 * usually have chip_info but we still might want to use
1165 chip->enable_dma = drv_data->master_info->enable_dma;
1168 chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
1169 chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres)
1170 | SSITF_TxHiThresh(tx_hi_thres);
1172 /* set dma burst and threshold outside of chip_info path so that if
1173 * chip_info goes away after setting chip->enable_dma, the
1174 * burst and threshold can still respond to changes in bits_per_word */
1175 if (chip->enable_dma) {
1176 /* set up legal burst and threshold for dma */
1177 if (pxa2xx_spi_set_dma_burst_and_threshold(chip, spi,
1179 &chip->dma_burst_size,
1180 &chip->dma_threshold)) {
1182 "in setup: DMA burst size reduced to match bits_per_word\n");
1186 clk_div = pxa2xx_ssp_get_clk_div(drv_data, chip, spi->max_speed_hz);
1187 chip->speed_hz = spi->max_speed_hz;
1189 chip->cr0 = pxa2xx_configure_sscr0(drv_data, clk_div,
1190 spi->bits_per_word);
1191 switch (drv_data->ssp_type) {
1192 case QUARK_X1000_SSP:
1193 chip->threshold = (QUARK_X1000_SSCR1_RxTresh(rx_thres)
1194 & QUARK_X1000_SSCR1_RFT)
1195 | (QUARK_X1000_SSCR1_TxTresh(tx_thres)
1196 & QUARK_X1000_SSCR1_TFT);
1199 chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
1200 (SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
1204 chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH);
1205 chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)
1206 | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);
1208 if (spi->mode & SPI_LOOP)
1209 chip->cr1 |= SSCR1_LBM;
1211 /* NOTE: PXA25x_SSP _could_ use external clocking ... */
1212 if (!pxa25x_ssp_comp(drv_data))
1213 dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
1214 drv_data->max_clk_rate
1215 / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)),
1216 chip->enable_dma ? "DMA" : "PIO");
1218 dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
1219 drv_data->max_clk_rate / 2
1220 / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)),
1221 chip->enable_dma ? "DMA" : "PIO");
1223 if (spi->bits_per_word <= 8) {
1225 chip->read = u8_reader;
1226 chip->write = u8_writer;
1227 } else if (spi->bits_per_word <= 16) {
1229 chip->read = u16_reader;
1230 chip->write = u16_writer;
1231 } else if (spi->bits_per_word <= 32) {
1232 if (!is_quark_x1000_ssp(drv_data))
1233 chip->cr0 |= SSCR0_EDSS;
1235 chip->read = u32_reader;
1236 chip->write = u32_writer;
1238 chip->bits_per_word = spi->bits_per_word;
1240 spi_set_ctldata(spi, chip);
1242 if (drv_data->ssp_type == CE4100_SSP)
1245 return setup_cs(spi, chip, chip_info);
1248 static void cleanup(struct spi_device *spi)
1250 struct chip_data *chip = spi_get_ctldata(spi);
1251 struct driver_data *drv_data = spi_master_get_devdata(spi->master);
1256 if (drv_data->ssp_type != CE4100_SSP && gpio_is_valid(chip->gpio_cs))
1257 gpio_free(chip->gpio_cs);
1264 static struct acpi_device_id pxa2xx_spi_acpi_match[] = {
1265 { "INT33C0", LPSS_LPT_SSP },
1266 { "INT33C1", LPSS_LPT_SSP },
1267 { "INT3430", LPSS_LPT_SSP },
1268 { "INT3431", LPSS_LPT_SSP },
1269 { "80860F0E", LPSS_BYT_SSP },
1270 { "8086228E", LPSS_BYT_SSP },
1273 MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
1275 static struct pxa2xx_spi_master *
1276 pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
1278 struct pxa2xx_spi_master *pdata;
1279 struct acpi_device *adev;
1280 struct ssp_device *ssp;
1281 struct resource *res;
1282 const struct acpi_device_id *id;
1285 if (!ACPI_HANDLE(&pdev->dev) ||
1286 acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
1289 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
1291 type = (int)id->driver_data;
1295 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1299 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1305 ssp->phys_base = res->start;
1306 ssp->mmio_base = devm_ioremap_resource(&pdev->dev, res);
1307 if (IS_ERR(ssp->mmio_base))
1310 ssp->clk = devm_clk_get(&pdev->dev, NULL);
1311 ssp->irq = platform_get_irq(pdev, 0);
1316 if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &devid))
1317 ssp->port_id = devid;
1319 pdata->num_chipselect = 1;
1320 pdata->enable_dma = true;
1326 static inline struct pxa2xx_spi_master *
1327 pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
1333 static int pxa2xx_spi_probe(struct platform_device *pdev)
1335 struct device *dev = &pdev->dev;
1336 struct pxa2xx_spi_master *platform_info;
1337 struct spi_master *master;
1338 struct driver_data *drv_data;
1339 struct ssp_device *ssp;
1343 platform_info = dev_get_platdata(dev);
1344 if (!platform_info) {
1345 platform_info = pxa2xx_spi_acpi_get_pdata(pdev);
1346 if (!platform_info) {
1347 dev_err(&pdev->dev, "missing platform data\n");
1352 ssp = pxa_ssp_request(pdev->id, pdev->name);
1354 ssp = &platform_info->ssp;
1356 if (!ssp->mmio_base) {
1357 dev_err(&pdev->dev, "failed to get ssp\n");
1361 /* Allocate master with space for drv_data and null dma buffer */
1362 master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
1364 dev_err(&pdev->dev, "cannot alloc spi_master\n");
1368 drv_data = spi_master_get_devdata(master);
1369 drv_data->master = master;
1370 drv_data->master_info = platform_info;
1371 drv_data->pdev = pdev;
1372 drv_data->ssp = ssp;
1374 master->dev.parent = &pdev->dev;
1375 master->dev.of_node = pdev->dev.of_node;
1376 /* the spi->mode bits understood by this driver: */
1377 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
1379 master->bus_num = ssp->port_id;
1380 master->num_chipselect = platform_info->num_chipselect;
1381 master->dma_alignment = DMA_ALIGNMENT;
1382 master->cleanup = cleanup;
1383 master->setup = setup;
1384 master->transfer_one_message = pxa2xx_spi_transfer_one_message;
1385 master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer;
1386 master->auto_runtime_pm = true;
1388 drv_data->ssp_type = ssp->type;
1389 drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT);
1391 drv_data->ioaddr = ssp->mmio_base;
1392 drv_data->ssdr_physical = ssp->phys_base + SSDR;
1393 if (pxa25x_ssp_comp(drv_data)) {
1394 switch (drv_data->ssp_type) {
1395 case QUARK_X1000_SSP:
1396 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1399 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
1403 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
1404 drv_data->dma_cr1 = 0;
1405 drv_data->clear_sr = SSSR_ROR;
1406 drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
1408 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1409 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
1410 drv_data->dma_cr1 = DEFAULT_DMA_CR1;
1411 drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
1412 drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
1415 status = request_irq(ssp->irq, ssp_int, IRQF_SHARED, dev_name(dev),
1418 dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq);
1419 goto out_error_master_alloc;
1422 /* Setup DMA if requested */
1423 drv_data->tx_channel = -1;
1424 drv_data->rx_channel = -1;
1425 if (platform_info->enable_dma) {
1426 status = pxa2xx_spi_dma_setup(drv_data);
1428 dev_dbg(dev, "no DMA channels available, using PIO\n");
1429 platform_info->enable_dma = false;
1433 /* Enable SOC clock */
1434 clk_prepare_enable(ssp->clk);
1436 drv_data->max_clk_rate = clk_get_rate(ssp->clk);
1438 /* Load default SSP configuration */
1439 pxa2xx_spi_write(drv_data, SSCR0, 0);
1440 switch (drv_data->ssp_type) {
1441 case QUARK_X1000_SSP:
1442 tmp = QUARK_X1000_SSCR1_RxTresh(RX_THRESH_QUARK_X1000_DFLT)
1443 | QUARK_X1000_SSCR1_TxTresh(TX_THRESH_QUARK_X1000_DFLT);
1444 pxa2xx_spi_write(drv_data, SSCR1, tmp);
1446 /* using the Motorola SPI protocol and use 8 bit frame */
1447 pxa2xx_spi_write(drv_data, SSCR0,
1448 QUARK_X1000_SSCR0_Motorola
1449 | QUARK_X1000_SSCR0_DataSize(8));
1452 tmp = SSCR1_RxTresh(RX_THRESH_DFLT) |
1453 SSCR1_TxTresh(TX_THRESH_DFLT);
1454 pxa2xx_spi_write(drv_data, SSCR1, tmp);
1455 tmp = SSCR0_SCR(2) | SSCR0_Motorola | SSCR0_DataSize(8);
1456 pxa2xx_spi_write(drv_data, SSCR0, tmp);
1460 if (!pxa25x_ssp_comp(drv_data))
1461 pxa2xx_spi_write(drv_data, SSTO, 0);
1463 if (!is_quark_x1000_ssp(drv_data))
1464 pxa2xx_spi_write(drv_data, SSPSP, 0);
1466 if (is_lpss_ssp(drv_data))
1467 lpss_ssp_setup(drv_data);
1469 tasklet_init(&drv_data->pump_transfers, pump_transfers,
1470 (unsigned long)drv_data);
1472 pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
1473 pm_runtime_use_autosuspend(&pdev->dev);
1474 pm_runtime_set_active(&pdev->dev);
1475 pm_runtime_enable(&pdev->dev);
1477 /* Register with the SPI framework */
1478 platform_set_drvdata(pdev, drv_data);
1479 status = devm_spi_register_master(&pdev->dev, master);
1481 dev_err(&pdev->dev, "problem registering spi master\n");
1482 goto out_error_clock_enabled;
1487 out_error_clock_enabled:
1488 clk_disable_unprepare(ssp->clk);
1489 pxa2xx_spi_dma_release(drv_data);
1490 free_irq(ssp->irq, drv_data);
1492 out_error_master_alloc:
1493 spi_master_put(master);
1498 static int pxa2xx_spi_remove(struct platform_device *pdev)
1500 struct driver_data *drv_data = platform_get_drvdata(pdev);
1501 struct ssp_device *ssp;
1505 ssp = drv_data->ssp;
1507 pm_runtime_get_sync(&pdev->dev);
1509 /* Disable the SSP at the peripheral and SOC level */
1510 pxa2xx_spi_write(drv_data, SSCR0, 0);
1511 clk_disable_unprepare(ssp->clk);
1514 if (drv_data->master_info->enable_dma)
1515 pxa2xx_spi_dma_release(drv_data);
1517 pm_runtime_put_noidle(&pdev->dev);
1518 pm_runtime_disable(&pdev->dev);
1521 free_irq(ssp->irq, drv_data);
1529 static void pxa2xx_spi_shutdown(struct platform_device *pdev)
1533 if ((status = pxa2xx_spi_remove(pdev)) != 0)
1534 dev_err(&pdev->dev, "shutdown failed with %d\n", status);
1537 #ifdef CONFIG_PM_SLEEP
1538 static int pxa2xx_spi_suspend(struct device *dev)
1540 struct driver_data *drv_data = dev_get_drvdata(dev);
1541 struct ssp_device *ssp = drv_data->ssp;
1544 status = spi_master_suspend(drv_data->master);
1547 pxa2xx_spi_write(drv_data, SSCR0, 0);
1549 if (!pm_runtime_suspended(dev))
1550 clk_disable_unprepare(ssp->clk);
1555 static int pxa2xx_spi_resume(struct device *dev)
1557 struct driver_data *drv_data = dev_get_drvdata(dev);
1558 struct ssp_device *ssp = drv_data->ssp;
1561 pxa2xx_spi_dma_resume(drv_data);
1563 /* Enable the SSP clock */
1564 if (!pm_runtime_suspended(dev))
1565 clk_prepare_enable(ssp->clk);
1567 /* Restore LPSS private register bits */
1568 if (is_lpss_ssp(drv_data))
1569 lpss_ssp_setup(drv_data);
1571 /* Start the queue running */
1572 status = spi_master_resume(drv_data->master);
1574 dev_err(dev, "problem starting queue (%d)\n", status);
1583 static int pxa2xx_spi_runtime_suspend(struct device *dev)
1585 struct driver_data *drv_data = dev_get_drvdata(dev);
1587 clk_disable_unprepare(drv_data->ssp->clk);
1591 static int pxa2xx_spi_runtime_resume(struct device *dev)
1593 struct driver_data *drv_data = dev_get_drvdata(dev);
1595 clk_prepare_enable(drv_data->ssp->clk);
1600 static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
1601 SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume)
1602 SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend,
1603 pxa2xx_spi_runtime_resume, NULL)
1606 static struct platform_driver driver = {
1608 .name = "pxa2xx-spi",
1609 .pm = &pxa2xx_spi_pm_ops,
1610 .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match),
1612 .probe = pxa2xx_spi_probe,
1613 .remove = pxa2xx_spi_remove,
1614 .shutdown = pxa2xx_spi_shutdown,
1617 static int __init pxa2xx_spi_init(void)
1619 return platform_driver_register(&driver);
1621 subsys_initcall(pxa2xx_spi_init);
1623 static void __exit pxa2xx_spi_exit(void)
1625 platform_driver_unregister(&driver);
1627 module_exit(pxa2xx_spi_exit);