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/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
23 #include <linux/of_device.h>
24 #include <linux/platform_device.h>
25 #include <linux/pm_runtime.h>
27 #include <linux/spi/sh_msiof.h>
28 #include <linux/spi/spi.h>
30 #include <asm/unaligned.h>
33 struct sh_msiof_chipdata {
39 struct sh_msiof_spi_priv {
40 void __iomem *mapbase;
42 struct platform_device *pdev;
43 const struct sh_msiof_chipdata *chipdata;
44 struct sh_msiof_spi_info *info;
45 struct completion done;
50 #define TMDR1 0x00 /* Transmit Mode Register 1 */
51 #define TMDR2 0x04 /* Transmit Mode Register 2 */
52 #define TMDR3 0x08 /* Transmit Mode Register 3 */
53 #define RMDR1 0x10 /* Receive Mode Register 1 */
54 #define RMDR2 0x14 /* Receive Mode Register 2 */
55 #define RMDR3 0x18 /* Receive Mode Register 3 */
56 #define TSCR 0x20 /* Transmit Clock Select Register */
57 #define RSCR 0x22 /* Receive Clock Select Register (SH, A1, APE6) */
58 #define CTR 0x28 /* Control Register */
59 #define FCTR 0x30 /* FIFO Control Register */
60 #define STR 0x40 /* Status Register */
61 #define IER 0x44 /* Interrupt Enable Register */
62 #define TDR1 0x48 /* Transmit Control Data Register 1 (SH, A1) */
63 #define TDR2 0x4c /* Transmit Control Data Register 2 (SH, A1) */
64 #define TFDR 0x50 /* Transmit FIFO Data Register */
65 #define RDR1 0x58 /* Receive Control Data Register 1 (SH, A1) */
66 #define RDR2 0x5c /* Receive Control Data Register 2 (SH, A1) */
67 #define RFDR 0x60 /* Receive FIFO Data Register */
70 #define MDR1_TRMD 0x80000000 /* Transfer Mode (1 = Master mode) */
71 #define MDR1_SYNCMD_MASK 0x30000000 /* SYNC Mode */
72 #define MDR1_SYNCMD_SPI 0x20000000 /* Level mode/SPI */
73 #define MDR1_SYNCMD_LR 0x30000000 /* L/R mode */
74 #define MDR1_SYNCAC_SHIFT 25 /* Sync Polarity (1 = Active-low) */
75 #define MDR1_BITLSB_SHIFT 24 /* MSB/LSB First (1 = LSB first) */
76 #define MDR1_FLD_MASK 0x000000c0 /* Frame Sync Signal Interval (0-3) */
77 #define MDR1_FLD_SHIFT 2
78 #define MDR1_XXSTP 0x00000001 /* Transmission/Reception Stop on FIFO */
80 #define TMDR1_PCON 0x40000000 /* Transfer Signal Connection */
83 #define MDR2_BITLEN1(i) (((i) - 1) << 24) /* Data Size (8-32 bits) */
84 #define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
85 #define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
88 #define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
89 #define SCR_BRPS(i) (((i) - 1) << 8)
90 #define SCR_BRDV_MASK 0x0007 /* Baud Rate Generator's Division Ratio */
91 #define SCR_BRDV_DIV_2 0x0000
92 #define SCR_BRDV_DIV_4 0x0001
93 #define SCR_BRDV_DIV_8 0x0002
94 #define SCR_BRDV_DIV_16 0x0003
95 #define SCR_BRDV_DIV_32 0x0004
96 #define SCR_BRDV_DIV_1 0x0007
99 #define CTR_TSCKIZ_MASK 0xc0000000 /* Transmit Clock I/O Polarity Select */
100 #define CTR_TSCKIZ_SCK 0x80000000 /* Disable SCK when TX disabled */
101 #define CTR_TSCKIZ_POL_SHIFT 30 /* Transmit Clock Polarity */
102 #define CTR_RSCKIZ_MASK 0x30000000 /* Receive Clock Polarity Select */
103 #define CTR_RSCKIZ_SCK 0x20000000 /* Must match CTR_TSCKIZ_SCK */
104 #define CTR_RSCKIZ_POL_SHIFT 28 /* Receive Clock Polarity */
105 #define CTR_TEDG_SHIFT 27 /* Transmit Timing (1 = falling edge) */
106 #define CTR_REDG_SHIFT 26 /* Receive Timing (1 = falling edge) */
107 #define CTR_TXDIZ_MASK 0x00c00000 /* Pin Output When TX is Disabled */
108 #define CTR_TXDIZ_LOW 0x00000000 /* 0 */
109 #define CTR_TXDIZ_HIGH 0x00400000 /* 1 */
110 #define CTR_TXDIZ_HIZ 0x00800000 /* High-impedance */
111 #define CTR_TSCKE 0x00008000 /* Transmit Serial Clock Output Enable */
112 #define CTR_TFSE 0x00004000 /* Transmit Frame Sync Signal Output Enable */
113 #define CTR_TXE 0x00000200 /* Transmit Enable */
114 #define CTR_RXE 0x00000100 /* Receive Enable */
117 #define FCTR_TFWM_MASK 0xe0000000 /* Transmit FIFO Watermark */
118 #define FCTR_TFWM_64 0x00000000 /* Transfer Request when 64 empty stages */
119 #define FCTR_TFWM_32 0x20000000 /* Transfer Request when 32 empty stages */
120 #define FCTR_TFWM_24 0x40000000 /* Transfer Request when 24 empty stages */
121 #define FCTR_TFWM_16 0x60000000 /* Transfer Request when 16 empty stages */
122 #define FCTR_TFWM_12 0x80000000 /* Transfer Request when 12 empty stages */
123 #define FCTR_TFWM_8 0xa0000000 /* Transfer Request when 8 empty stages */
124 #define FCTR_TFWM_4 0xc0000000 /* Transfer Request when 4 empty stages */
125 #define FCTR_TFWM_1 0xe0000000 /* Transfer Request when 1 empty stage */
126 #define FCTR_TFUA_MASK 0x07f00000 /* Transmit FIFO Usable Area */
127 #define FCTR_TFUA_SHIFT 20
128 #define FCTR_TFUA(i) ((i) << FCTR_TFUA_SHIFT)
129 #define FCTR_RFWM_MASK 0x0000e000 /* Receive FIFO Watermark */
130 #define FCTR_RFWM_1 0x00000000 /* Transfer Request when 1 valid stages */
131 #define FCTR_RFWM_4 0x00002000 /* Transfer Request when 4 valid stages */
132 #define FCTR_RFWM_8 0x00004000 /* Transfer Request when 8 valid stages */
133 #define FCTR_RFWM_16 0x00006000 /* Transfer Request when 16 valid stages */
134 #define FCTR_RFWM_32 0x00008000 /* Transfer Request when 32 valid stages */
135 #define FCTR_RFWM_64 0x0000a000 /* Transfer Request when 64 valid stages */
136 #define FCTR_RFWM_128 0x0000c000 /* Transfer Request when 128 valid stages */
137 #define FCTR_RFWM_256 0x0000e000 /* Transfer Request when 256 valid stages */
138 #define FCTR_RFUA_MASK 0x00001ff0 /* Receive FIFO Usable Area (0x40 = full) */
139 #define FCTR_RFUA_SHIFT 4
140 #define FCTR_RFUA(i) ((i) << FCTR_RFUA_SHIFT)
143 #define STR_TFEMP 0x20000000 /* Transmit FIFO Empty */
144 #define STR_TDREQ 0x10000000 /* Transmit Data Transfer Request */
145 #define STR_TEOF 0x00800000 /* Frame Transmission End */
146 #define STR_TFSERR 0x00200000 /* Transmit Frame Synchronization Error */
147 #define STR_TFOVF 0x00100000 /* Transmit FIFO Overflow */
148 #define STR_TFUDF 0x00080000 /* Transmit FIFO Underflow */
149 #define STR_RFFUL 0x00002000 /* Receive FIFO Full */
150 #define STR_RDREQ 0x00001000 /* Receive Data Transfer Request */
151 #define STR_REOF 0x00000080 /* Frame Reception End */
152 #define STR_RFSERR 0x00000020 /* Receive Frame Synchronization Error */
153 #define STR_RFUDF 0x00000010 /* Receive FIFO Underflow */
154 #define STR_RFOVF 0x00000008 /* Receive FIFO Overflow */
157 #define IER_TDMAE 0x80000000 /* Transmit Data DMA Transfer Req. Enable */
158 #define IER_TFEMPE 0x20000000 /* Transmit FIFO Empty Enable */
159 #define IER_TDREQE 0x10000000 /* Transmit Data Transfer Request Enable */
160 #define IER_TEOFE 0x00800000 /* Frame Transmission End Enable */
161 #define IER_TFSERRE 0x00200000 /* Transmit Frame Sync Error Enable */
162 #define IER_TFOVFE 0x00100000 /* Transmit FIFO Overflow Enable */
163 #define IER_TFUDFE 0x00080000 /* Transmit FIFO Underflow Enable */
164 #define IER_RDMAE 0x00008000 /* Receive Data DMA Transfer Req. Enable */
165 #define IER_RFFULE 0x00002000 /* Receive FIFO Full Enable */
166 #define IER_RDREQE 0x00001000 /* Receive Data Transfer Request Enable */
167 #define IER_REOFE 0x00000080 /* Frame Reception End Enable */
168 #define IER_RFSERRE 0x00000020 /* Receive Frame Sync Error Enable */
169 #define IER_RFUDFE 0x00000010 /* Receive FIFO Underflow Enable */
170 #define IER_RFOVFE 0x00000008 /* Receive FIFO Overflow Enable */
173 static u32 sh_msiof_read(struct sh_msiof_spi_priv *p, int reg_offs)
178 return ioread16(p->mapbase + reg_offs);
180 return ioread32(p->mapbase + reg_offs);
184 static void sh_msiof_write(struct sh_msiof_spi_priv *p, int reg_offs,
190 iowrite16(value, p->mapbase + reg_offs);
193 iowrite32(value, p->mapbase + reg_offs);
198 static int sh_msiof_modify_ctr_wait(struct sh_msiof_spi_priv *p,
201 u32 mask = clr | set;
205 data = sh_msiof_read(p, CTR);
208 sh_msiof_write(p, CTR, data);
210 for (k = 100; k > 0; k--) {
211 if ((sh_msiof_read(p, CTR) & mask) == set)
217 return k > 0 ? 0 : -ETIMEDOUT;
220 static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
222 struct sh_msiof_spi_priv *p = data;
224 /* just disable the interrupt and wake up */
225 sh_msiof_write(p, IER, 0);
234 } const sh_msiof_spi_clk_table[] = {
235 { 1, SCR_BRPS( 1) | SCR_BRDV_DIV_1 },
236 { 2, SCR_BRPS( 1) | SCR_BRDV_DIV_2 },
237 { 4, SCR_BRPS( 1) | SCR_BRDV_DIV_4 },
238 { 8, SCR_BRPS( 1) | SCR_BRDV_DIV_8 },
239 { 16, SCR_BRPS( 1) | SCR_BRDV_DIV_16 },
240 { 32, SCR_BRPS( 1) | SCR_BRDV_DIV_32 },
241 { 64, SCR_BRPS(32) | SCR_BRDV_DIV_2 },
242 { 128, SCR_BRPS(32) | SCR_BRDV_DIV_4 },
243 { 256, SCR_BRPS(32) | SCR_BRDV_DIV_8 },
244 { 512, SCR_BRPS(32) | SCR_BRDV_DIV_16 },
245 { 1024, SCR_BRPS(32) | SCR_BRDV_DIV_32 },
248 static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
249 unsigned long parent_rate, u32 spi_hz)
251 unsigned long div = 1024;
254 if (!WARN_ON(!spi_hz || !parent_rate))
255 div = DIV_ROUND_UP(parent_rate, spi_hz);
257 /* TODO: make more fine grained */
259 for (k = 0; k < ARRAY_SIZE(sh_msiof_spi_clk_table); k++) {
260 if (sh_msiof_spi_clk_table[k].div >= div)
264 k = min_t(int, k, ARRAY_SIZE(sh_msiof_spi_clk_table) - 1);
266 sh_msiof_write(p, TSCR, sh_msiof_spi_clk_table[k].scr);
267 if (!(p->chipdata->master_flags & SPI_MASTER_MUST_TX))
268 sh_msiof_write(p, RSCR, sh_msiof_spi_clk_table[k].scr);
271 static void sh_msiof_spi_set_pin_regs(struct sh_msiof_spi_priv *p,
273 u32 tx_hi_z, u32 lsb_first, u32 cs_high)
279 * CPOL CPHA TSCKIZ RSCKIZ TEDG REDG
285 sh_msiof_write(p, FCTR, 0);
287 tmp = MDR1_SYNCMD_SPI | 1 << MDR1_FLD_SHIFT | MDR1_XXSTP;
288 tmp |= !cs_high << MDR1_SYNCAC_SHIFT;
289 tmp |= lsb_first << MDR1_BITLSB_SHIFT;
290 sh_msiof_write(p, TMDR1, tmp | MDR1_TRMD | TMDR1_PCON);
291 if (p->chipdata->master_flags & SPI_MASTER_MUST_TX) {
292 /* These bits are reserved if RX needs TX */
295 sh_msiof_write(p, RMDR1, tmp);
298 tmp |= CTR_TSCKIZ_SCK | cpol << CTR_TSCKIZ_POL_SHIFT;
299 tmp |= CTR_RSCKIZ_SCK | cpol << CTR_RSCKIZ_POL_SHIFT;
303 tmp |= edge << CTR_TEDG_SHIFT;
304 tmp |= edge << CTR_REDG_SHIFT;
305 tmp |= tx_hi_z ? CTR_TXDIZ_HIZ : CTR_TXDIZ_LOW;
306 sh_msiof_write(p, CTR, tmp);
309 static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
310 const void *tx_buf, void *rx_buf,
313 u32 dr2 = MDR2_BITLEN1(bits) | MDR2_WDLEN1(words);
315 if (tx_buf || (p->chipdata->master_flags & SPI_MASTER_MUST_TX))
316 sh_msiof_write(p, TMDR2, dr2);
318 sh_msiof_write(p, TMDR2, dr2 | MDR2_GRPMASK1);
321 sh_msiof_write(p, RMDR2, dr2);
323 sh_msiof_write(p, IER, STR_TEOF | STR_REOF);
326 static void sh_msiof_reset_str(struct sh_msiof_spi_priv *p)
328 sh_msiof_write(p, STR, sh_msiof_read(p, STR));
331 static void sh_msiof_spi_write_fifo_8(struct sh_msiof_spi_priv *p,
332 const void *tx_buf, int words, int fs)
334 const u8 *buf_8 = tx_buf;
337 for (k = 0; k < words; k++)
338 sh_msiof_write(p, TFDR, buf_8[k] << fs);
341 static void sh_msiof_spi_write_fifo_16(struct sh_msiof_spi_priv *p,
342 const void *tx_buf, int words, int fs)
344 const u16 *buf_16 = tx_buf;
347 for (k = 0; k < words; k++)
348 sh_msiof_write(p, TFDR, buf_16[k] << fs);
351 static void sh_msiof_spi_write_fifo_16u(struct sh_msiof_spi_priv *p,
352 const void *tx_buf, int words, int fs)
354 const u16 *buf_16 = tx_buf;
357 for (k = 0; k < words; k++)
358 sh_msiof_write(p, TFDR, get_unaligned(&buf_16[k]) << fs);
361 static void sh_msiof_spi_write_fifo_32(struct sh_msiof_spi_priv *p,
362 const void *tx_buf, int words, int fs)
364 const u32 *buf_32 = tx_buf;
367 for (k = 0; k < words; k++)
368 sh_msiof_write(p, TFDR, buf_32[k] << fs);
371 static void sh_msiof_spi_write_fifo_32u(struct sh_msiof_spi_priv *p,
372 const void *tx_buf, int words, int fs)
374 const u32 *buf_32 = tx_buf;
377 for (k = 0; k < words; k++)
378 sh_msiof_write(p, TFDR, get_unaligned(&buf_32[k]) << fs);
381 static void sh_msiof_spi_write_fifo_s32(struct sh_msiof_spi_priv *p,
382 const void *tx_buf, int words, int fs)
384 const u32 *buf_32 = tx_buf;
387 for (k = 0; k < words; k++)
388 sh_msiof_write(p, TFDR, swab32(buf_32[k] << fs));
391 static void sh_msiof_spi_write_fifo_s32u(struct sh_msiof_spi_priv *p,
392 const void *tx_buf, int words, int fs)
394 const u32 *buf_32 = tx_buf;
397 for (k = 0; k < words; k++)
398 sh_msiof_write(p, TFDR, swab32(get_unaligned(&buf_32[k]) << fs));
401 static void sh_msiof_spi_read_fifo_8(struct sh_msiof_spi_priv *p,
402 void *rx_buf, int words, int fs)
407 for (k = 0; k < words; k++)
408 buf_8[k] = sh_msiof_read(p, RFDR) >> fs;
411 static void sh_msiof_spi_read_fifo_16(struct sh_msiof_spi_priv *p,
412 void *rx_buf, int words, int fs)
414 u16 *buf_16 = rx_buf;
417 for (k = 0; k < words; k++)
418 buf_16[k] = sh_msiof_read(p, RFDR) >> fs;
421 static void sh_msiof_spi_read_fifo_16u(struct sh_msiof_spi_priv *p,
422 void *rx_buf, int words, int fs)
424 u16 *buf_16 = rx_buf;
427 for (k = 0; k < words; k++)
428 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_16[k]);
431 static void sh_msiof_spi_read_fifo_32(struct sh_msiof_spi_priv *p,
432 void *rx_buf, int words, int fs)
434 u32 *buf_32 = rx_buf;
437 for (k = 0; k < words; k++)
438 buf_32[k] = sh_msiof_read(p, RFDR) >> fs;
441 static void sh_msiof_spi_read_fifo_32u(struct sh_msiof_spi_priv *p,
442 void *rx_buf, int words, int fs)
444 u32 *buf_32 = rx_buf;
447 for (k = 0; k < words; k++)
448 put_unaligned(sh_msiof_read(p, RFDR) >> fs, &buf_32[k]);
451 static void sh_msiof_spi_read_fifo_s32(struct sh_msiof_spi_priv *p,
452 void *rx_buf, int words, int fs)
454 u32 *buf_32 = rx_buf;
457 for (k = 0; k < words; k++)
458 buf_32[k] = swab32(sh_msiof_read(p, RFDR) >> fs);
461 static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
462 void *rx_buf, int words, int fs)
464 u32 *buf_32 = rx_buf;
467 for (k = 0; k < words; k++)
468 put_unaligned(swab32(sh_msiof_read(p, RFDR) >> fs), &buf_32[k]);
471 static int sh_msiof_spi_setup(struct spi_device *spi)
473 struct device_node *np = spi->master->dev.of_node;
474 struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master);
478 * Use spi->controller_data for CS (same strategy as spi_gpio),
479 * if any. otherwise let HW control CS
481 spi->cs_gpio = (uintptr_t)spi->controller_data;
484 /* Configure pins before deasserting CS */
485 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
486 !!(spi->mode & SPI_CPHA),
487 !!(spi->mode & SPI_3WIRE),
488 !!(spi->mode & SPI_LSB_FIRST),
489 !!(spi->mode & SPI_CS_HIGH));
491 if (spi->cs_gpio >= 0)
492 gpio_set_value(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
497 static int sh_msiof_prepare_message(struct spi_master *master,
498 struct spi_message *msg)
500 struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
501 const struct spi_device *spi = msg->spi;
503 /* Configure pins before asserting CS */
504 sh_msiof_spi_set_pin_regs(p, !!(spi->mode & SPI_CPOL),
505 !!(spi->mode & SPI_CPHA),
506 !!(spi->mode & SPI_3WIRE),
507 !!(spi->mode & SPI_LSB_FIRST),
508 !!(spi->mode & SPI_CS_HIGH));
512 static int sh_msiof_spi_start(struct sh_msiof_spi_priv *p, void *rx_buf)
516 /* setup clock and rx/tx signals */
517 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TSCKE);
519 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_RXE);
521 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TXE);
523 /* start by setting frame bit */
525 ret = sh_msiof_modify_ctr_wait(p, 0, CTR_TFSE);
530 static int sh_msiof_spi_stop(struct sh_msiof_spi_priv *p, void *rx_buf)
534 /* shut down frame, rx/tx and clock signals */
535 ret = sh_msiof_modify_ctr_wait(p, CTR_TFSE, 0);
537 ret = sh_msiof_modify_ctr_wait(p, CTR_TXE, 0);
539 ret = sh_msiof_modify_ctr_wait(p, CTR_RXE, 0);
541 ret = sh_msiof_modify_ctr_wait(p, CTR_TSCKE, 0);
546 static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
547 void (*tx_fifo)(struct sh_msiof_spi_priv *,
548 const void *, int, int),
549 void (*rx_fifo)(struct sh_msiof_spi_priv *,
551 const void *tx_buf, void *rx_buf,
557 /* limit maximum word transfer to rx/tx fifo size */
559 words = min_t(int, words, p->tx_fifo_size);
561 words = min_t(int, words, p->rx_fifo_size);
563 /* the fifo contents need shifting */
564 fifo_shift = 32 - bits;
566 /* setup msiof transfer mode registers */
567 sh_msiof_spi_set_mode_regs(p, tx_buf, rx_buf, bits, words);
571 tx_fifo(p, tx_buf, words, fifo_shift);
573 reinit_completion(&p->done);
575 ret = sh_msiof_spi_start(p, rx_buf);
577 dev_err(&p->pdev->dev, "failed to start hardware\n");
581 /* wait for tx fifo to be emptied / rx fifo to be filled */
582 wait_for_completion(&p->done);
586 rx_fifo(p, rx_buf, words, fifo_shift);
588 /* clear status bits */
589 sh_msiof_reset_str(p);
591 ret = sh_msiof_spi_stop(p, rx_buf);
593 dev_err(&p->pdev->dev, "failed to shut down hardware\n");
600 sh_msiof_write(p, IER, 0);
604 static int sh_msiof_transfer_one(struct spi_master *master,
605 struct spi_device *spi,
606 struct spi_transfer *t)
608 struct sh_msiof_spi_priv *p = spi_master_get_devdata(master);
609 void (*tx_fifo)(struct sh_msiof_spi_priv *, const void *, int, int);
610 void (*rx_fifo)(struct sh_msiof_spi_priv *, void *, int, int);
618 bits = t->bits_per_word;
620 if (bits <= 8 && t->len > 15 && !(t->len & 3)) {
627 /* setup bytes per word and fifo read/write functions */
630 tx_fifo = sh_msiof_spi_write_fifo_8;
631 rx_fifo = sh_msiof_spi_read_fifo_8;
632 } else if (bits <= 16) {
634 if ((unsigned long)t->tx_buf & 0x01)
635 tx_fifo = sh_msiof_spi_write_fifo_16u;
637 tx_fifo = sh_msiof_spi_write_fifo_16;
639 if ((unsigned long)t->rx_buf & 0x01)
640 rx_fifo = sh_msiof_spi_read_fifo_16u;
642 rx_fifo = sh_msiof_spi_read_fifo_16;
645 if ((unsigned long)t->tx_buf & 0x03)
646 tx_fifo = sh_msiof_spi_write_fifo_s32u;
648 tx_fifo = sh_msiof_spi_write_fifo_s32;
650 if ((unsigned long)t->rx_buf & 0x03)
651 rx_fifo = sh_msiof_spi_read_fifo_s32u;
653 rx_fifo = sh_msiof_spi_read_fifo_s32;
656 if ((unsigned long)t->tx_buf & 0x03)
657 tx_fifo = sh_msiof_spi_write_fifo_32u;
659 tx_fifo = sh_msiof_spi_write_fifo_32;
661 if ((unsigned long)t->rx_buf & 0x03)
662 rx_fifo = sh_msiof_spi_read_fifo_32u;
664 rx_fifo = sh_msiof_spi_read_fifo_32;
667 /* setup clocks (clock already enabled in chipselect()) */
668 sh_msiof_spi_set_clk_regs(p, clk_get_rate(p->clk), t->speed_hz);
670 /* transfer in fifo sized chunks */
671 words = t->len / bytes_per_word;
674 while (bytes_done < t->len) {
675 void *rx_buf = t->rx_buf ? t->rx_buf + bytes_done : NULL;
676 const void *tx_buf = t->tx_buf ? t->tx_buf + bytes_done : NULL;
677 n = sh_msiof_spi_txrx_once(p, tx_fifo, rx_fifo,
684 bytes_done += n * bytes_per_word;
691 static const struct sh_msiof_chipdata sh_data = {
697 static const struct sh_msiof_chipdata r8a779x_data = {
700 .master_flags = SPI_MASTER_MUST_TX,
703 static const struct of_device_id sh_msiof_match[] = {
704 { .compatible = "renesas,sh-msiof", .data = &sh_data },
705 { .compatible = "renesas,sh-mobile-msiof", .data = &sh_data },
706 { .compatible = "renesas,msiof-r8a7790", .data = &r8a779x_data },
707 { .compatible = "renesas,msiof-r8a7791", .data = &r8a779x_data },
710 MODULE_DEVICE_TABLE(of, sh_msiof_match);
713 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
715 struct sh_msiof_spi_info *info;
716 struct device_node *np = dev->of_node;
719 info = devm_kzalloc(dev, sizeof(struct sh_msiof_spi_info), GFP_KERNEL);
723 /* Parse the MSIOF properties */
724 of_property_read_u32(np, "num-cs", &num_cs);
725 of_property_read_u32(np, "renesas,tx-fifo-size",
726 &info->tx_fifo_override);
727 of_property_read_u32(np, "renesas,rx-fifo-size",
728 &info->rx_fifo_override);
730 info->num_chipselect = num_cs;
735 static struct sh_msiof_spi_info *sh_msiof_spi_parse_dt(struct device *dev)
741 static int sh_msiof_spi_probe(struct platform_device *pdev)
744 struct spi_master *master;
745 const struct of_device_id *of_id;
746 struct sh_msiof_spi_priv *p;
750 master = spi_alloc_master(&pdev->dev, sizeof(struct sh_msiof_spi_priv));
751 if (master == NULL) {
752 dev_err(&pdev->dev, "failed to allocate spi master\n");
756 p = spi_master_get_devdata(master);
758 platform_set_drvdata(pdev, p);
760 of_id = of_match_device(sh_msiof_match, &pdev->dev);
762 p->chipdata = of_id->data;
763 p->info = sh_msiof_spi_parse_dt(&pdev->dev);
765 p->chipdata = (const void *)pdev->id_entry->driver_data;
766 p->info = dev_get_platdata(&pdev->dev);
770 dev_err(&pdev->dev, "failed to obtain device info\n");
775 init_completion(&p->done);
777 p->clk = devm_clk_get(&pdev->dev, NULL);
778 if (IS_ERR(p->clk)) {
779 dev_err(&pdev->dev, "cannot get clock\n");
780 ret = PTR_ERR(p->clk);
784 i = platform_get_irq(pdev, 0);
786 dev_err(&pdev->dev, "cannot get platform IRQ\n");
791 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
792 p->mapbase = devm_ioremap_resource(&pdev->dev, r);
793 if (IS_ERR(p->mapbase)) {
794 ret = PTR_ERR(p->mapbase);
798 ret = devm_request_irq(&pdev->dev, i, sh_msiof_spi_irq, 0,
799 dev_name(&pdev->dev), p);
801 dev_err(&pdev->dev, "unable to request irq\n");
806 pm_runtime_enable(&pdev->dev);
808 /* Platform data may override FIFO sizes */
809 p->tx_fifo_size = p->chipdata->tx_fifo_size;
810 p->rx_fifo_size = p->chipdata->rx_fifo_size;
811 if (p->info->tx_fifo_override)
812 p->tx_fifo_size = p->info->tx_fifo_override;
813 if (p->info->rx_fifo_override)
814 p->rx_fifo_size = p->info->rx_fifo_override;
816 /* init master code */
817 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
818 master->mode_bits |= SPI_LSB_FIRST | SPI_3WIRE;
819 master->flags = p->chipdata->master_flags;
820 master->bus_num = pdev->id;
821 master->dev.of_node = pdev->dev.of_node;
822 master->num_chipselect = p->info->num_chipselect;
823 master->setup = sh_msiof_spi_setup;
824 master->prepare_message = sh_msiof_prepare_message;
825 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
826 master->auto_runtime_pm = true;
827 master->transfer_one = sh_msiof_transfer_one;
829 ret = devm_spi_register_master(&pdev->dev, master);
831 dev_err(&pdev->dev, "spi_register_master error.\n");
838 pm_runtime_disable(&pdev->dev);
840 spi_master_put(master);
844 static int sh_msiof_spi_remove(struct platform_device *pdev)
846 pm_runtime_disable(&pdev->dev);
850 static struct platform_device_id spi_driver_ids[] = {
851 { "spi_sh_msiof", (kernel_ulong_t)&sh_data },
852 { "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
853 { "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },
856 MODULE_DEVICE_TABLE(platform, spi_driver_ids);
858 static struct platform_driver sh_msiof_spi_drv = {
859 .probe = sh_msiof_spi_probe,
860 .remove = sh_msiof_spi_remove,
861 .id_table = spi_driver_ids,
863 .name = "spi_sh_msiof",
864 .owner = THIS_MODULE,
865 .of_match_table = of_match_ptr(sh_msiof_match),
868 module_platform_driver(sh_msiof_spi_drv);
870 MODULE_DESCRIPTION("SuperH MSIOF SPI Master Interface Driver");
871 MODULE_AUTHOR("Magnus Damm");
872 MODULE_LICENSE("GPL v2");
873 MODULE_ALIAS("platform:spi_sh_msiof");