2 * SuperH MSIOF SPI Master Interface
4 * Copyright (c) 2009 Magnus Damm
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #include <linux/bitmap.h>
13 #include <linux/clk.h>
14 #include <linux/completion.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/gpio.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
24 #include <linux/of_device.h>
25 #include <linux/platform_device.h>
26 #include <linux/pm_runtime.h>
28 #include <linux/spi/sh_msiof.h>
29 #include <linux/spi/spi.h>
30 #include <linux/spi/spi_bitbang.h>
32 #include <asm/unaligned.h>
35 struct sh_msiof_chipdata {
41 struct sh_msiof_spi_priv {
42 struct spi_bitbang bitbang; /* must be first for spi_bitbang.c */
43 void __iomem *mapbase;
45 struct platform_device *pdev;
46 const struct sh_msiof_chipdata *chipdata;
47 struct sh_msiof_spi_info *info;
48 struct completion done;
53 #define TMDR1 0x00 /* Transmit Mode Register 1 */
54 #define TMDR2 0x04 /* Transmit Mode Register 2 */
55 #define TMDR3 0x08 /* Transmit Mode Register 3 */
56 #define RMDR1 0x10 /* Receive Mode Register 1 */
57 #define RMDR2 0x14 /* Receive Mode Register 2 */
58 #define RMDR3 0x18 /* Receive Mode Register 3 */
59 #define TSCR 0x20 /* Transmit Clock Select Register */
60 #define RSCR 0x22 /* Receive Clock Select Register (SH, A1, APE6) */
61 #define CTR 0x28 /* Control Register */
62 #define FCTR 0x30 /* FIFO Control Register */
63 #define STR 0x40 /* Status Register */
64 #define IER 0x44 /* Interrupt Enable Register */
65 #define TDR1 0x48 /* Transmit Control Data Register 1 (SH, A1) */
66 #define TDR2 0x4c /* Transmit Control Data Register 2 (SH, A1) */
67 #define TFDR 0x50 /* Transmit FIFO Data Register */
68 #define RDR1 0x58 /* Receive Control Data Register 1 (SH, A1) */
69 #define RDR2 0x5c /* Receive Control Data Register 2 (SH, A1) */
70 #define RFDR 0x60 /* Receive FIFO Data Register */
73 #define MDR1_TRMD 0x80000000 /* Transfer Mode (1 = Master mode) */
74 #define MDR1_SYNCMD_MASK 0x30000000 /* SYNC Mode */
75 #define MDR1_SYNCMD_SPI 0x20000000 /* Level mode/SPI */
76 #define MDR1_SYNCMD_LR 0x30000000 /* L/R mode */
77 #define MDR1_SYNCAC_SHIFT 25 /* Sync Polarity (1 = Active-low) */
78 #define MDR1_BITLSB_SHIFT 24 /* MSB/LSB First (1 = LSB first) */
79 #define MDR1_FLD_MASK 0x000000c0 /* Frame Sync Signal Interval (0-3) */
80 #define MDR1_FLD_SHIFT 2
81 #define MDR1_XXSTP 0x00000001 /* Transmission/Reception Stop on FIFO */
83 #define TMDR1_PCON 0x40000000 /* Transfer Signal Connection */
86 #define MDR2_BITLEN1(i) (((i) - 1) << 24) /* Data Size (8-32 bits) */
87 #define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
88 #define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
91 #define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
92 #define SCR_BRPS(i) (((i) - 1) << 8)
93 #define SCR_BRDV_MASK 0x0007 /* Baud Rate Generator's Division Ratio */
94 #define SCR_BRDV_DIV_2 0x0000
95 #define SCR_BRDV_DIV_4 0x0001
96 #define SCR_BRDV_DIV_8 0x0002
97 #define SCR_BRDV_DIV_16 0x0003
98 #define SCR_BRDV_DIV_32 0x0004
99 #define SCR_BRDV_DIV_1 0x0007
102 #define CTR_TSCKIZ_MASK 0xc0000000 /* Transmit Clock I/O Polarity Select */
103 #define CTR_TSCKIZ_SCK 0x80000000 /* Disable SCK when TX disabled */
104 #define CTR_TSCKIZ_POL_SHIFT 30 /* Transmit Clock Polarity */
105 #define CTR_RSCKIZ_MASK 0x30000000 /* Receive Clock Polarity Select */
106 #define CTR_RSCKIZ_SCK 0x20000000 /* Must match CTR_TSCKIZ_SCK */
107 #define CTR_RSCKIZ_POL_SHIFT 28 /* Receive Clock Polarity */
108 #define CTR_TEDG_SHIFT 27 /* Transmit Timing (1 = falling edge) */
109 #define CTR_REDG_SHIFT 26 /* Receive Timing (1 = falling edge) */
110 #define CTR_TXDIZ_MASK 0x00c00000 /* Pin Output When TX is Disabled */
111 #define CTR_TXDIZ_LOW 0x00000000 /* 0 */
112 #define CTR_TXDIZ_HIGH 0x00400000 /* 1 */
113 #define CTR_TXDIZ_HIZ 0x00800000 /* High-impedance */
114 #define CTR_TSCKE 0x00008000 /* Transmit Serial Clock Output Enable */
115 #define CTR_TFSE 0x00004000 /* Transmit Frame Sync Signal Output Enable */
116 #define CTR_TXE 0x00000200 /* Transmit Enable */
117 #define CTR_RXE 0x00000100 /* Receive Enable */
120 #define STR_TEOF 0x00800000 /* Frame Transmission End */
121 #define STR_REOF 0x00000080 /* Frame Reception End */
124 static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
129 return ioread16(p->mapbase + reg_offs);
131 return ioread32(p->mapbase + reg_offs);
135 static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
141 iowrite16(value, p->mapbase + reg_offs);
144 iowrite32(value, p->mapbase + reg_offs);
149 static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
152 u32 mask = clr | set;
156 data = sh_msiof_read(p, CTR);
159 sh_msiof_write(p, CTR, data);
161 for (k = 100; k > 0; k--) {
162 if ((sh_msiof_read(p, CTR) & mask) == set)
168 return k > 0 ? 0 : -ETIMEDOUT;
171 static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
173 struct sh_msiof_spi_priv *p = data;
175 /* just disable the interrupt and wake up */
176 sh_msiof_write(p, IER, 0);
185 } const sh_msiof_spi_clk_table[] = {
186 { 1, SCR_BRPS( 1) | SCR_BRDV_DIV_1 },
187 { 2, SCR_BRPS( 1) | SCR_BRDV_DIV_2 },
188 { 4, SCR_BRPS( 1) | SCR_BRDV_DIV_4 },
189 { 8, SCR_BRPS( 1) | SCR_BRDV_DIV_8 },
190 { 16, SCR_BRPS( 1) | SCR_BRDV_DIV_16 },
191 { 32, SCR_BRPS( 1) | SCR_BRDV_DIV_32 },
192 { 64, SCR_BRPS(32) | SCR_BRDV_DIV_2 },
193 { 128, SCR_BRPS(32) | SCR_BRDV_DIV_4 },
194 { 256, SCR_BRPS(32) | SCR_BRDV_DIV_8 },
195 { 512, SCR_BRPS(32) | SCR_BRDV_DIV_16 },
196 { 1024, SCR_BRPS(32) | SCR_BRDV_DIV_32 },
199 static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
200 unsigned long parent_rate, u32 spi_hz)
202 unsigned long div = 1024;
205 if (!WARN_ON(!spi_hz || !parent_rate))
206 div = DIV_ROUND_UP(parent_rate, spi_hz);
208 /* TODO: make more fine grained */
210 for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_clk_table); k++) {
211 if (sh_msiof_spi_clk_table[k].div >= div)
215 k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1);
217 sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr);
218 if (!(p->chipdata->master_flags & SPI_MASTER_MUST_TX))
219 sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr);
222 static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
224 u32 tx_hi_z, u32 lsb_first, u32 cs_high)
230 * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG
236 sh_msiof_write(p, FCTR, 0);
238 tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
239 tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
240 tmp |= lsb_first << MDR1_BITLSB_SHIFT;
241 sh_msiof_write(p, TMDR1, tmp | MDR1_TRMD | TMDR1_PCON);
242 if (p->chipdata->master_flags & SPI_MASTER_MUST_TX) {
243 /* These bits are reserved if RX needs TX */
246 sh_msiof_write(p, RMDR1, tmp);
249 tmp |= CTR_TSCKIZ_SCK | cpol << CTR_TSCKIZ_POL_SHIFT;
250 tmp |= CTR_RSCKIZ_SCK | cpol << CTR_RSCKIZ_POL_SHIFT;
254 tmp |= edge << CTR_TEDG_SHIFT;
255 tmp |= edge << CTR_REDG_SHIFT;
256 tmp |= tx_hi_z ? CTR_TXDIZ_HIZ : CTR_TXDIZ_LOW;
257 sh_msiof_write(p, CTR, tmp);
260 static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
261 const void *tx_buf, void *rx_buf,
264 u32 dr2 = MDR2_BITLEN1(bits) | MDR2_WDLEN1(words);
266 if (tx_buf || (p->chipdata->master_flags & SPI_MASTER_MUST_TX))
267 sh_msiof_write(p, TMDR2, dr2);
269 sh_msiof_write(p, TMDR2, dr2 | MDR2_GRPMASK1);
272 sh_msiof_write(p, RMDR2, dr2);
274 sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
277 static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
279 sh_msiof_write(p, STR, sh_msiof_read(p, STR));
282 static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
283 const void *tx_buf, int words, int fs)
285 const u8 *buf_8 = tx_buf;
288 for (k = 0; k < words; k++)
289 sh_msiof_write(p, TFDR, buf_8[k] << fs);
292 static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
293 const void *tx_buf, int words, int fs)
295 const u16 *buf_16 = tx_buf;
298 for (k = 0; k < words; k++)
299 sh_msiof_write(p, TFDR, buf_16[k] << fs);
302 static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
303 const void *tx_buf, int words, int fs)
305 const u16 *buf_16 = tx_buf;
308 for (k = 0; k < words; k++)
309 sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
312 static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
313 const void *tx_buf, int words, int fs)
315 const u32 *buf_32 = tx_buf;
318 for (k = 0; k < words; k++)
319 sh_msiof_write(p, TFDR, buf_32[k] << fs);
322 static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
323 const void *tx_buf, int words, int fs)
325 const u32 *buf_32 = tx_buf;
328 for (k = 0; k < words; k++)
329 sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
332 static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p,
333 const void *tx_buf, int words, int fs)
335 const u32 *buf_32 = tx_buf;
338 for (k = 0; k < words; k++)
339 sh_msiof_write(p, TFDR, swab32(buf_32[k] << fs));
342 static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p,
343 const void *tx_buf, int words, int fs)
345 const u32 *buf_32 = tx_buf;
348 for (k = 0; k < words; k++)
349 sh_msiof_write(p, TFDR, swab32(get_unaligned(&buf_32[k]) << fs));
352 static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
353 void *rx_buf, int words, int fs)
358 for (k = 0; k < words; k++)
359 buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
362 static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
363 void *rx_buf, int words, int fs)
365 u16 *buf_16 = rx_buf;
368 for (k = 0; k < words; k++)
369 buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
372 static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
373 void *rx_buf, int words, int fs)
375 u16 *buf_16 = rx_buf;
378 for (k = 0; k < words; k++)
379 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
382 static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
383 void *rx_buf, int words, int fs)
385 u32 *buf_32 = rx_buf;
388 for (k = 0; k < words; k++)
389 buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
392 static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
393 void *rx_buf, int words, int fs)
395 u32 *buf_32 = rx_buf;
398 for (k = 0; k < words; k++)
399 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
402 static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p,
403 void *rx_buf, int words, int fs)
405 u32 *buf_32 = rx_buf;
408 for (k = 0; k < words; k++)
409 buf_32[k] = swab32(sh_msiof_read(p, RFDR) >> fs);
412 static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
413 void *rx_buf, int words, int fs)
415 u32 *buf_32 = rx_buf;
418 for (k = 0; k < words; k++)
419 put_unaligned(swab32(sh_msiof_read(p, RFDR) >> fs), &buf_32[k]);
422 static int sh_msiof_spi_bits(struct spi_device *spi, struct spi_transfer *t)
426 bits = t ? t->bits_per_word : 0;
428 bits = spi->bits_per_word;
432 static u32 sh_msiof_spi_hz(struct spi_device *spi, struct spi_transfer *t)
436 hz = t ? t->speed_hz : 0;
438 hz = spi->max_speed_hz;
442 static int sh_msiof_spi_setup(struct spi_device *spi)
444 struct device_node *np = spi->master->dev.of_node;
445 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
449 * Use spi->controller_data for CS (same strategy as spi_gpio),
450 * if any. otherwise let HW control CS
452 spi->cs_gpio = (uintptr_t)spi->controller_data;
455 /* Configure pins before deasserting CS */
456 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
457 !!(spi->mode & SPI_CPHA),
458 !!(spi->mode & SPI_3WIRE),
459 !!(spi->mode & SPI_LSB_FIRST),
460 !!(spi->mode & SPI_CS_HIGH));
462 return spi_bitbang_setup(spi);
465 static int sh_msiof_prepare_message(struct spi_master *master,
466 struct spi_message *msg)
468 struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
469 const struct spi_device *spi = msg->spi;
471 pm_runtime_get_sync(&p->pdev->dev);
474 /* Configure pins before asserting CS */
475 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
476 !!(spi->mode & SPI_CPHA),
477 !!(spi->mode & SPI_3WIRE),
478 !!(spi->mode & SPI_LSB_FIRST),
479 !!(spi->mode & SPI_CS_HIGH));
483 static int sh_msiof_unprepare_message(struct spi_master *master,
484 struct spi_message *msg)
486 struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
489 pm_runtime_put(&p->pdev->dev);
493 static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on)
497 /* chip select is active low unless SPI_CS_HIGH is set */
498 if (spi->mode & SPI_CS_HIGH)
499 value = (is_on == BITBANG_CS_ACTIVE) ? 1 : 0;
501 value = (is_on == BITBANG_CS_ACTIVE) ? 0 : 1;
503 if (spi->cs_gpio >= 0)
504 gpio_set_value(spi->cs_gpio, value);
507 static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
508 void (*tx_fifo)(struct sh_msiof_spi_priv *,
509 const void *, int, int),
510 void (*rx_fifo)(struct sh_msiof_spi_priv *,
512 const void *tx_buf, void *rx_buf,
518 /* limit maximum word transfer to rx/tx fifo size */
520 words = min_t(int, words, p->tx_fifo_size);
522 words = min_t(int, words, p->rx_fifo_size);
524 /* the fifo contents need shifting */
525 fifo_shift = 32 - bits;
527 /* setup msiof transfer mode registers */
528 sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
532 tx_fifo(p, tx_buf, words, fifo_shift);
534 /* setup clock and rx/tx signals */
535 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
537 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
538 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
540 /* start by setting frame bit */
541 reinit_completion(&p->done);
542 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
544 dev_err(&p->pdev->dev, "failed to start hardware\n");
548 /* wait for tx fifo to be emptied / rx fifo to be filled */
549 wait_for_completion(&p->done);
553 rx_fifo(p, rx_buf, words, fifo_shift);
555 /* clear status bits */
556 sh_msiof_reset_str(p);
558 /* shut down frame, rx/tx and clock signals */
559 ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
560 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
562 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
563 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
565 dev_err(&p->pdev->dev, "failed to shut down hardware\n");
572 sh_msiof_write(p, IER, 0);
576 static int sh_msiof_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
578 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
579 void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
580 void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
588 bits = sh_msiof_spi_bits(spi, t);
590 if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
597 /* setup bytes per word and fifo read/write functions */
600 tx_fifo = sh_msiof_spi_write_fifo_8;
601 rx_fifo = sh_msiof_spi_read_fifo_8;
602 } else if (bits <= 16) {
604 if ((unsigned long)t->tx_buf & 0x01)
605 tx_fifo = sh_msiof_spi_write_fifo_16u;
607 tx_fifo = sh_msiof_spi_write_fifo_16;
609 if ((unsigned long)t->rx_buf & 0x01)
610 rx_fifo = sh_msiof_spi_read_fifo_16u;
612 rx_fifo = sh_msiof_spi_read_fifo_16;
615 if ((unsigned long)t->tx_buf & 0x03)
616 tx_fifo = sh_msiof_spi_write_fifo_s32u;
618 tx_fifo = sh_msiof_spi_write_fifo_s32;
620 if ((unsigned long)t->rx_buf & 0x03)
621 rx_fifo = sh_msiof_spi_read_fifo_s32u;
623 rx_fifo = sh_msiof_spi_read_fifo_s32;
626 if ((unsigned long)t->tx_buf & 0x03)
627 tx_fifo = sh_msiof_spi_write_fifo_32u;
629 tx_fifo = sh_msiof_spi_write_fifo_32;
631 if ((unsigned long)t->rx_buf & 0x03)
632 rx_fifo = sh_msiof_spi_read_fifo_32u;
634 rx_fifo = sh_msiof_spi_read_fifo_32;
637 /* setup clocks (clock already enabled in chipselect()) */
638 sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk),
639 sh_msiof_spi_hz(spi, t));
641 /* transfer in fifo sized chunks */
642 words = t->len / bytes_per_word;
645 while (bytes_done < t->len) {
646 void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
647 const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
648 n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
655 bytes_done += n * bytes_per_word;
662 static u32 sh_msiof_spi_txrx_word(struct spi_device *spi, unsigned nsecs,
665 BUG(); /* unused but needed by bitbang code */
669 static const struct sh_msiof_chipdata sh_data = {
675 static const struct sh_msiof_chipdata r8a779x_data = {
678 .master_flags = SPI_MASTER_MUST_TX,
681 static const struct of_device_id sh_msiof_match[] = {
682 { .compatible = "renesas,sh-msiof", .data = &sh_data },
683 { .compatible = "renesas,sh-mobile-msiof", .data = &sh_data },
684 { .compatible = "renesas,msiof-r8a7790", .data = &r8a779x_data },
685 { .compatible = "renesas,msiof-r8a7791", .data = &r8a779x_data },
688 MODULE_DEVICE_TABLE(of, sh_msiof_match);
691 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
693 struct sh_msiof_spi_info *info;
694 struct device_node *np = dev->of_node;
697 info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
699 dev_err(dev, "failed to allocate setup data\n");
703 /* Parse the MSIOF properties */
704 of_property_read_u32(np, "num-cs", &num_cs);
705 of_property_read_u32(np, "renesas,tx-fifo-size",
706 &info->tx_fifo_override);
707 of_property_read_u32(np, "renesas,rx-fifo-size",
708 &info->rx_fifo_override);
710 info->num_chipselect = num_cs;
715 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
721 static int sh_msiof_spi_probe(struct platform_device *pdev)
724 struct spi_master *master;
725 const struct of_device_id *of_id;
726 struct sh_msiof_spi_priv *p;
730 master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv));
731 if (master == NULL) {
732 dev_err(&pdev->dev, "failed to allocate spi master\n");
736 p = spi_master_get_devdata(master);
738 platform_set_drvdata(pdev, p);
740 of_id = of_match_device(sh_msiof_match, &pdev->dev);
742 p->chipdata = of_id->data;
743 p->info = sh_msiof_spi_parse_dt(&pdev->dev);
745 p->chipdata = (const void *)pdev->id_entry->driver_data;
746 p->info = dev_get_platdata(&pdev->dev);
750 dev_err(&pdev->dev, "failed to obtain device info\n");
755 init_completion(&p->done);
757 p->clk = devm_clk_get(&pdev->dev, NULL);
758 if (IS_ERR(p->clk)) {
759 dev_err(&pdev->dev, "cannot get clock\n");
760 ret = PTR_ERR(p->clk);
764 i = platform_get_irq(pdev, 0);
766 dev_err(&pdev->dev, "cannot get platform IRQ\n");
771 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
772 p->mapbase = devm_ioremap_resource(&pdev->dev, r);
773 if (IS_ERR(p->mapbase)) {
774 ret = PTR_ERR(p->mapbase);
778 ret = devm_request_irq(&pdev->dev, i, sh_msiof_spi_irq, 0,
779 dev_name(&pdev->dev), p);
781 dev_err(&pdev->dev, "unable to request irq\n");
785 ret = clk_prepare(p->clk);
787 dev_err(&pdev->dev, "unable to prepare clock\n");
792 pm_runtime_enable(&pdev->dev);
794 /* Platform data may override FIFO sizes */
795 p->tx_fifo_size = p->chipdata->tx_fifo_size;
796 p->rx_fifo_size = p->chipdata->rx_fifo_size;
797 if (p->info->tx_fifo_override)
798 p->tx_fifo_size = p->info->tx_fifo_override;
799 if (p->info->rx_fifo_override)
800 p->rx_fifo_size = p->info->rx_fifo_override;
802 /* init master and bitbang code */
803 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
804 master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE;
805 master->flags = p->chipdata->master_flags;
806 master->bus_num = pdev->id;
807 master->dev.of_node = pdev->dev.of_node;
808 master->num_chipselect = p->info->num_chipselect;
809 master->setup = sh_msiof_spi_setup;
810 master->cleanup = spi_bitbang_cleanup;
811 master->prepare_message = sh_msiof_prepare_message;
812 master->unprepare_message = sh_msiof_unprepare_message;
813 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
815 p->bitbang.master = master;
816 p->bitbang.chipselect = sh_msiof_spi_chipselect;
817 p->bitbang.setup_transfer = spi_bitbang_setup_transfer;
818 p->bitbang.txrx_bufs = sh_msiof_spi_txrx;
819 p->bitbang.txrx_word[SPI_MODE_0] = sh_msiof_spi_txrx_word;
820 p->bitbang.txrx_word[SPI_MODE_1] = sh_msiof_spi_txrx_word;
821 p->bitbang.txrx_word[SPI_MODE_2] = sh_msiof_spi_txrx_word;
822 p->bitbang.txrx_word[SPI_MODE_3] = sh_msiof_spi_txrx_word;
824 ret = spi_bitbang_start(&p->bitbang);
828 pm_runtime_disable(&pdev->dev);
829 clk_unprepare(p->clk);
831 spi_master_put(master);
835 static int sh_msiof_spi_remove(struct platform_device *pdev)
837 struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
840 ret = spi_bitbang_stop(&p->bitbang);
842 pm_runtime_disable(&pdev->dev);
843 clk_unprepare(p->clk);
844 spi_master_put(p->bitbang.master);
849 static struct platform_device_id spi_driver_ids[] = {
850 { "spi_sh_msiof", (kernel_ulong_t)&sh_data },
851 { "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
852 { "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },
855 MODULE_DEVICE_TABLE(platform, spi_driver_ids);
857 static struct platform_driver sh_msiof_spi_drv = {
858 .probe = sh_msiof_spi_probe,
859 .remove = sh_msiof_spi_remove,
860 .id_table = spi_driver_ids,
862 .name = "spi_sh_msiof",
863 .owner = THIS_MODULE,
864 .of_match_table = of_match_ptr(sh_msiof_match),
867 module_platform_driver(sh_msiof_spi_drv);
869 MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
870 MODULE_AUTHOR("Magnus Damm");
871 MODULE_LICENSE("GPL v2");
872 MODULE_ALIAS("platform:spi_sh_msiof");