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>
31 #include <asm/unaligned.h>
34 struct sh_msiof_chipdata {
40 struct sh_msiof_spi_priv {
41 void __iomem *mapbase;
43 struct platform_device *pdev;
44 const struct sh_msiof_chipdata *chipdata;
45 struct sh_msiof_spi_info *info;
46 struct completion done;
51 #define TMDR1 0x00 /* Transmit Mode Register 1 */
52 #define TMDR2 0x04 /* Transmit Mode Register 2 */
53 #define TMDR3 0x08 /* Transmit Mode Register 3 */
54 #define RMDR1 0x10 /* Receive Mode Register 1 */
55 #define RMDR2 0x14 /* Receive Mode Register 2 */
56 #define RMDR3 0x18 /* Receive Mode Register 3 */
57 #define TSCR 0x20 /* Transmit Clock Select Register */
58 #define RSCR 0x22 /* Receive Clock Select Register (SH, A1, APE6) */
59 #define CTR 0x28 /* Control Register */
60 #define FCTR 0x30 /* FIFO Control Register */
61 #define STR 0x40 /* Status Register */
62 #define IER 0x44 /* Interrupt Enable Register */
63 #define TDR1 0x48 /* Transmit Control Data Register 1 (SH, A1) */
64 #define TDR2 0x4c /* Transmit Control Data Register 2 (SH, A1) */
65 #define TFDR 0x50 /* Transmit FIFO Data Register */
66 #define RDR1 0x58 /* Receive Control Data Register 1 (SH, A1) */
67 #define RDR2 0x5c /* Receive Control Data Register 2 (SH, A1) */
68 #define RFDR 0x60 /* Receive FIFO Data Register */
71 #define MDR1_TRMD 0x80000000 /* Transfer Mode (1 = Master mode) */
72 #define MDR1_SYNCMD_MASK 0x30000000 /* SYNC Mode */
73 #define MDR1_SYNCMD_SPI 0x20000000 /* Level mode/SPI */
74 #define MDR1_SYNCMD_LR 0x30000000 /* L/R mode */
75 #define MDR1_SYNCAC_SHIFT 25 /* Sync Polarity (1 = Active-low) */
76 #define MDR1_BITLSB_SHIFT 24 /* MSB/LSB First (1 = LSB first) */
77 #define MDR1_FLD_MASK 0x000000c0 /* Frame Sync Signal Interval (0-3) */
78 #define MDR1_FLD_SHIFT 2
79 #define MDR1_XXSTP 0x00000001 /* Transmission/Reception Stop on FIFO */
81 #define TMDR1_PCON 0x40000000 /* Transfer Signal Connection */
84 #define MDR2_BITLEN1(i) (((i) - 1) << 24) /* Data Size (8-32 bits) */
85 #define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
86 #define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
89 #define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
90 #define SCR_BRPS(i) (((i) - 1) << 8)
91 #define SCR_BRDV_MASK 0x0007 /* Baud Rate Generator's Division Ratio */
92 #define SCR_BRDV_DIV_2 0x0000
93 #define SCR_BRDV_DIV_4 0x0001
94 #define SCR_BRDV_DIV_8 0x0002
95 #define SCR_BRDV_DIV_16 0x0003
96 #define SCR_BRDV_DIV_32 0x0004
97 #define SCR_BRDV_DIV_1 0x0007
100 #define CTR_TSCKIZ_MASK 0xc0000000 /* Transmit Clock I/O Polarity Select */
101 #define CTR_TSCKIZ_SCK 0x80000000 /* Disable SCK when TX disabled */
102 #define CTR_TSCKIZ_POL_SHIFT 30 /* Transmit Clock Polarity */
103 #define CTR_RSCKIZ_MASK 0x30000000 /* Receive Clock Polarity Select */
104 #define CTR_RSCKIZ_SCK 0x20000000 /* Must match CTR_TSCKIZ_SCK */
105 #define CTR_RSCKIZ_POL_SHIFT 28 /* Receive Clock Polarity */
106 #define CTR_TEDG_SHIFT 27 /* Transmit Timing (1 = falling edge) */
107 #define CTR_REDG_SHIFT 26 /* Receive Timing (1 = falling edge) */
108 #define CTR_TXDIZ_MASK 0x00c00000 /* Pin Output When TX is Disabled */
109 #define CTR_TXDIZ_LOW 0x00000000 /* 0 */
110 #define CTR_TXDIZ_HIGH 0x00400000 /* 1 */
111 #define CTR_TXDIZ_HIZ 0x00800000 /* High-impedance */
112 #define CTR_TSCKE 0x00008000 /* Transmit Serial Clock Output Enable */
113 #define CTR_TFSE 0x00004000 /* Transmit Frame Sync Signal Output Enable */
114 #define CTR_TXE 0x00000200 /* Transmit Enable */
115 #define CTR_RXE 0x00000100 /* Receive Enable */
118 #define STR_TEOF 0x00800000 /* Frame Transmission End */
119 #define STR_REOF 0x00000080 /* Frame Reception End */
122 static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
127 return ioread16(p->mapbase + reg_offs);
129 return ioread32(p->mapbase + reg_offs);
133 static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
139 iowrite16(value, p->mapbase + reg_offs);
142 iowrite32(value, p->mapbase + reg_offs);
147 static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
150 u32 mask = clr | set;
154 data = sh_msiof_read(p, CTR);
157 sh_msiof_write(p, CTR, data);
159 for (k = 100; k > 0; k--) {
160 if ((sh_msiof_read(p, CTR) & mask) == set)
166 return k > 0 ? 0 : -ETIMEDOUT;
169 static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
171 struct sh_msiof_spi_priv *p = data;
173 /* just disable the interrupt and wake up */
174 sh_msiof_write(p, IER, 0);
183 } const sh_msiof_spi_clk_table[] = {
184 { 1, SCR_BRPS( 1) | SCR_BRDV_DIV_1 },
185 { 2, SCR_BRPS( 1) | SCR_BRDV_DIV_2 },
186 { 4, SCR_BRPS( 1) | SCR_BRDV_DIV_4 },
187 { 8, SCR_BRPS( 1) | SCR_BRDV_DIV_8 },
188 { 16, SCR_BRPS( 1) | SCR_BRDV_DIV_16 },
189 { 32, SCR_BRPS( 1) | SCR_BRDV_DIV_32 },
190 { 64, SCR_BRPS(32) | SCR_BRDV_DIV_2 },
191 { 128, SCR_BRPS(32) | SCR_BRDV_DIV_4 },
192 { 256, SCR_BRPS(32) | SCR_BRDV_DIV_8 },
193 { 512, SCR_BRPS(32) | SCR_BRDV_DIV_16 },
194 { 1024, SCR_BRPS(32) | SCR_BRDV_DIV_32 },
197 static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
198 unsigned long parent_rate, u32 spi_hz)
200 unsigned long div = 1024;
203 if (!WARN_ON(!spi_hz || !parent_rate))
204 div = DIV_ROUND_UP(parent_rate, spi_hz);
206 /* TODO: make more fine grained */
208 for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_clk_table); k++) {
209 if (sh_msiof_spi_clk_table[k].div >= div)
213 k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1);
215 sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr);
216 if (!(p->chipdata->master_flags & SPI_MASTER_MUST_TX))
217 sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr);
220 static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
222 u32 tx_hi_z, u32 lsb_first, u32 cs_high)
228 * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG
234 sh_msiof_write(p, FCTR, 0);
236 tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
237 tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
238 tmp |= lsb_first << MDR1_BITLSB_SHIFT;
239 sh_msiof_write(p, TMDR1, tmp | MDR1_TRMD | TMDR1_PCON);
240 if (p->chipdata->master_flags & SPI_MASTER_MUST_TX) {
241 /* These bits are reserved if RX needs TX */
244 sh_msiof_write(p, RMDR1, tmp);
247 tmp |= CTR_TSCKIZ_SCK | cpol << CTR_TSCKIZ_POL_SHIFT;
248 tmp |= CTR_RSCKIZ_SCK | cpol << CTR_RSCKIZ_POL_SHIFT;
252 tmp |= edge << CTR_TEDG_SHIFT;
253 tmp |= edge << CTR_REDG_SHIFT;
254 tmp |= tx_hi_z ? CTR_TXDIZ_HIZ : CTR_TXDIZ_LOW;
255 sh_msiof_write(p, CTR, tmp);
258 static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
259 const void *tx_buf, void *rx_buf,
262 u32 dr2 = MDR2_BITLEN1(bits) | MDR2_WDLEN1(words);
264 if (tx_buf || (p->chipdata->master_flags & SPI_MASTER_MUST_TX))
265 sh_msiof_write(p, TMDR2, dr2);
267 sh_msiof_write(p, TMDR2, dr2 | MDR2_GRPMASK1);
270 sh_msiof_write(p, RMDR2, dr2);
272 sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
275 static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
277 sh_msiof_write(p, STR, sh_msiof_read(p, STR));
280 static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
281 const void *tx_buf, int words, int fs)
283 const u8 *buf_8 = tx_buf;
286 for (k = 0; k < words; k++)
287 sh_msiof_write(p, TFDR, buf_8[k] << fs);
290 static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
291 const void *tx_buf, int words, int fs)
293 const u16 *buf_16 = tx_buf;
296 for (k = 0; k < words; k++)
297 sh_msiof_write(p, TFDR, buf_16[k] << fs);
300 static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
301 const void *tx_buf, int words, int fs)
303 const u16 *buf_16 = tx_buf;
306 for (k = 0; k < words; k++)
307 sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
310 static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
311 const void *tx_buf, int words, int fs)
313 const u32 *buf_32 = tx_buf;
316 for (k = 0; k < words; k++)
317 sh_msiof_write(p, TFDR, buf_32[k] << fs);
320 static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
321 const void *tx_buf, int words, int fs)
323 const u32 *buf_32 = tx_buf;
326 for (k = 0; k < words; k++)
327 sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
330 static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p,
331 const void *tx_buf, int words, int fs)
333 const u32 *buf_32 = tx_buf;
336 for (k = 0; k < words; k++)
337 sh_msiof_write(p, TFDR, swab32(buf_32[k] << fs));
340 static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p,
341 const void *tx_buf, int words, int fs)
343 const u32 *buf_32 = tx_buf;
346 for (k = 0; k < words; k++)
347 sh_msiof_write(p, TFDR, swab32(get_unaligned(&buf_32[k]) << fs));
350 static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
351 void *rx_buf, int words, int fs)
356 for (k = 0; k < words; k++)
357 buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
360 static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
361 void *rx_buf, int words, int fs)
363 u16 *buf_16 = rx_buf;
366 for (k = 0; k < words; k++)
367 buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
370 static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
371 void *rx_buf, int words, int fs)
373 u16 *buf_16 = rx_buf;
376 for (k = 0; k < words; k++)
377 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
380 static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
381 void *rx_buf, int words, int fs)
383 u32 *buf_32 = rx_buf;
386 for (k = 0; k < words; k++)
387 buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
390 static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
391 void *rx_buf, int words, int fs)
393 u32 *buf_32 = rx_buf;
396 for (k = 0; k < words; k++)
397 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
400 static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p,
401 void *rx_buf, int words, int fs)
403 u32 *buf_32 = rx_buf;
406 for (k = 0; k < words; k++)
407 buf_32[k] = swab32(sh_msiof_read(p, RFDR) >> fs);
410 static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
411 void *rx_buf, int words, int fs)
413 u32 *buf_32 = rx_buf;
416 for (k = 0; k < words; k++)
417 put_unaligned(swab32(sh_msiof_read(p, RFDR) >> fs), &buf_32[k]);
420 static int sh_msiof_spi_bits(struct spi_device *spi, struct spi_transfer *t)
424 bits = t ? t->bits_per_word : 0;
426 bits = spi->bits_per_word;
430 static u32 sh_msiof_spi_hz(struct spi_device *spi, struct spi_transfer *t)
434 hz = t ? t->speed_hz : 0;
436 hz = spi->max_speed_hz;
440 static int sh_msiof_spi_setup(struct spi_device *spi)
442 struct device_node *np = spi->master->dev.of_node;
443 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
447 * Use spi->controller_data for CS (same strategy as spi_gpio),
448 * if any. otherwise let HW control CS
450 spi->cs_gpio = (uintptr_t)spi->controller_data;
453 /* Configure pins before deasserting CS */
454 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
455 !!(spi->mode & SPI_CPHA),
456 !!(spi->mode & SPI_3WIRE),
457 !!(spi->mode & SPI_LSB_FIRST),
458 !!(spi->mode & SPI_CS_HIGH));
460 if (spi->cs_gpio >= 0)
461 gpio_set_value(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
466 static int sh_msiof_prepare_message(struct spi_master *master,
467 struct spi_message *msg)
469 struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
470 const struct spi_device *spi = msg->spi;
472 pm_runtime_get_sync(&p->pdev->dev);
475 /* Configure pins before asserting CS */
476 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
477 !!(spi->mode & SPI_CPHA),
478 !!(spi->mode & SPI_3WIRE),
479 !!(spi->mode & SPI_LSB_FIRST),
480 !!(spi->mode & SPI_CS_HIGH));
484 static int sh_msiof_unprepare_message(struct spi_master *master,
485 struct spi_message *msg)
487 struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
490 pm_runtime_put(&p->pdev->dev);
494 static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
495 void (*tx_fifo)(struct sh_msiof_spi_priv *,
496 const void *, int, int),
497 void (*rx_fifo)(struct sh_msiof_spi_priv *,
499 const void *tx_buf, void *rx_buf,
505 /* limit maximum word transfer to rx/tx fifo size */
507 words = min_t(int, words, p->tx_fifo_size);
509 words = min_t(int, words, p->rx_fifo_size);
511 /* the fifo contents need shifting */
512 fifo_shift = 32 - bits;
514 /* setup msiof transfer mode registers */
515 sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
519 tx_fifo(p, tx_buf, words, fifo_shift);
521 /* setup clock and rx/tx signals */
522 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
524 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
525 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
527 /* start by setting frame bit */
528 reinit_completion(&p->done);
529 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
531 dev_err(&p->pdev->dev, "failed to start hardware\n");
535 /* wait for tx fifo to be emptied / rx fifo to be filled */
536 wait_for_completion(&p->done);
540 rx_fifo(p, rx_buf, words, fifo_shift);
542 /* clear status bits */
543 sh_msiof_reset_str(p);
545 /* shut down frame, rx/tx and clock signals */
546 ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
547 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
549 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
550 ret = ret ? ret : sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
552 dev_err(&p->pdev->dev, "failed to shut down hardware\n");
559 sh_msiof_write(p, IER, 0);
563 static int sh_msiof_transfer_one(struct spi_master *master,
564 struct spi_device *spi,
565 struct spi_transfer *t)
567 struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
568 void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
569 void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
577 bits = sh_msiof_spi_bits(spi, t);
579 if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
586 /* setup bytes per word and fifo read/write functions */
589 tx_fifo = sh_msiof_spi_write_fifo_8;
590 rx_fifo = sh_msiof_spi_read_fifo_8;
591 } else if (bits <= 16) {
593 if ((unsigned long)t->tx_buf & 0x01)
594 tx_fifo = sh_msiof_spi_write_fifo_16u;
596 tx_fifo = sh_msiof_spi_write_fifo_16;
598 if ((unsigned long)t->rx_buf & 0x01)
599 rx_fifo = sh_msiof_spi_read_fifo_16u;
601 rx_fifo = sh_msiof_spi_read_fifo_16;
604 if ((unsigned long)t->tx_buf & 0x03)
605 tx_fifo = sh_msiof_spi_write_fifo_s32u;
607 tx_fifo = sh_msiof_spi_write_fifo_s32;
609 if ((unsigned long)t->rx_buf & 0x03)
610 rx_fifo = sh_msiof_spi_read_fifo_s32u;
612 rx_fifo = sh_msiof_spi_read_fifo_s32;
615 if ((unsigned long)t->tx_buf & 0x03)
616 tx_fifo = sh_msiof_spi_write_fifo_32u;
618 tx_fifo = sh_msiof_spi_write_fifo_32;
620 if ((unsigned long)t->rx_buf & 0x03)
621 rx_fifo = sh_msiof_spi_read_fifo_32u;
623 rx_fifo = sh_msiof_spi_read_fifo_32;
626 /* setup clocks (clock already enabled in chipselect()) */
627 sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk),
628 sh_msiof_spi_hz(spi, t));
630 /* transfer in fifo sized chunks */
631 words = t->len / bytes_per_word;
634 while (bytes_done < t->len) {
635 void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
636 const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
637 n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
644 bytes_done += n * bytes_per_word;
651 static const struct sh_msiof_chipdata sh_data = {
657 static const struct sh_msiof_chipdata r8a779x_data = {
660 .master_flags = SPI_MASTER_MUST_TX,
663 static const struct of_device_id sh_msiof_match[] = {
664 { .compatible = "renesas,sh-msiof", .data = &sh_data },
665 { .compatible = "renesas,sh-mobile-msiof", .data = &sh_data },
666 { .compatible = "renesas,msiof-r8a7790", .data = &r8a779x_data },
667 { .compatible = "renesas,msiof-r8a7791", .data = &r8a779x_data },
670 MODULE_DEVICE_TABLE(of, sh_msiof_match);
673 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
675 struct sh_msiof_spi_info *info;
676 struct device_node *np = dev->of_node;
679 info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
681 dev_err(dev, "failed to allocate setup data\n");
685 /* Parse the MSIOF properties */
686 of_property_read_u32(np, "num-cs", &num_cs);
687 of_property_read_u32(np, "renesas,tx-fifo-size",
688 &info->tx_fifo_override);
689 of_property_read_u32(np, "renesas,rx-fifo-size",
690 &info->rx_fifo_override);
692 info->num_chipselect = num_cs;
697 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
703 static int sh_msiof_spi_probe(struct platform_device *pdev)
706 struct spi_master *master;
707 const struct of_device_id *of_id;
708 struct sh_msiof_spi_priv *p;
712 master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv));
713 if (master == NULL) {
714 dev_err(&pdev->dev, "failed to allocate spi master\n");
718 p = spi_master_get_devdata(master);
720 platform_set_drvdata(pdev, p);
722 of_id = of_match_device(sh_msiof_match, &pdev->dev);
724 p->chipdata = of_id->data;
725 p->info = sh_msiof_spi_parse_dt(&pdev->dev);
727 p->chipdata = (const void *)pdev->id_entry->driver_data;
728 p->info = dev_get_platdata(&pdev->dev);
732 dev_err(&pdev->dev, "failed to obtain device info\n");
737 init_completion(&p->done);
739 p->clk = devm_clk_get(&pdev->dev, NULL);
740 if (IS_ERR(p->clk)) {
741 dev_err(&pdev->dev, "cannot get clock\n");
742 ret = PTR_ERR(p->clk);
746 i = platform_get_irq(pdev, 0);
748 dev_err(&pdev->dev, "cannot get platform IRQ\n");
753 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
754 p->mapbase = devm_ioremap_resource(&pdev->dev, r);
755 if (IS_ERR(p->mapbase)) {
756 ret = PTR_ERR(p->mapbase);
760 ret = devm_request_irq(&pdev->dev, i, sh_msiof_spi_irq, 0,
761 dev_name(&pdev->dev), p);
763 dev_err(&pdev->dev, "unable to request irq\n");
767 ret = clk_prepare(p->clk);
769 dev_err(&pdev->dev, "unable to prepare clock\n");
774 pm_runtime_enable(&pdev->dev);
776 /* Platform data may override FIFO sizes */
777 p->tx_fifo_size = p->chipdata->tx_fifo_size;
778 p->rx_fifo_size = p->chipdata->rx_fifo_size;
779 if (p->info->tx_fifo_override)
780 p->tx_fifo_size = p->info->tx_fifo_override;
781 if (p->info->rx_fifo_override)
782 p->rx_fifo_size = p->info->rx_fifo_override;
784 /* init master code */
785 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
786 master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE;
787 master->flags = p->chipdata->master_flags;
788 master->bus_num = pdev->id;
789 master->dev.of_node = pdev->dev.of_node;
790 master->num_chipselect = p->info->num_chipselect;
791 master->setup = sh_msiof_spi_setup;
792 master->prepare_message = sh_msiof_prepare_message;
793 master->unprepare_message = sh_msiof_unprepare_message;
794 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
795 master->transfer_one = sh_msiof_transfer_one;
797 ret = devm_spi_register_master(&pdev->dev, master);
799 dev_err(&pdev->dev, "spi_register_master error.\n");
806 pm_runtime_disable(&pdev->dev);
807 clk_unprepare(p->clk);
809 spi_master_put(master);
813 static int sh_msiof_spi_remove(struct platform_device *pdev)
815 struct sh_msiof_spi_priv *p = platform_get_drvdata(pdev);
817 pm_runtime_disable(&pdev->dev);
818 clk_unprepare(p->clk);
822 static struct platform_device_id spi_driver_ids[] = {
823 { "spi_sh_msiof", (kernel_ulong_t)&sh_data },
824 { "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
825 { "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },
828 MODULE_DEVICE_TABLE(platform, spi_driver_ids);
830 static struct platform_driver sh_msiof_spi_drv = {
831 .probe = sh_msiof_spi_probe,
832 .remove = sh_msiof_spi_remove,
833 .id_table = spi_driver_ids,
835 .name = "spi_sh_msiof",
836 .owner = THIS_MODULE,
837 .of_match_table = of_match_ptr(sh_msiof_match),
840 module_platform_driver(sh_msiof_spi_drv);
842 MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
843 MODULE_AUTHOR("Magnus Damm");
844 MODULE_LICENSE("GPL v2");
845 MODULE_ALIAS("platform:spi_sh_msiof");