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8b60d6c2 MH |
1 | /* |
2 | * Freescale eSPI controller driver. | |
3 | * | |
4 | * Copyright 2010 Freescale Semiconductor, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/spi/spi.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/fsl_devices.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/of.h> | |
5af50730 RH |
19 | #include <linux/of_address.h> |
20 | #include <linux/of_irq.h> | |
8b60d6c2 | 21 | #include <linux/of_platform.h> |
8b60d6c2 MH |
22 | #include <linux/interrupt.h> |
23 | #include <linux/err.h> | |
24 | #include <sysdev/fsl_soc.h> | |
25 | ||
ca632f55 | 26 | #include "spi-fsl-lib.h" |
8b60d6c2 MH |
27 | |
28 | /* eSPI Controller registers */ | |
29 | struct fsl_espi_reg { | |
30 | __be32 mode; /* 0x000 - eSPI mode register */ | |
31 | __be32 event; /* 0x004 - eSPI event register */ | |
32 | __be32 mask; /* 0x008 - eSPI mask register */ | |
33 | __be32 command; /* 0x00c - eSPI command register */ | |
34 | __be32 transmit; /* 0x010 - eSPI transmit FIFO access register*/ | |
35 | __be32 receive; /* 0x014 - eSPI receive FIFO access register*/ | |
36 | u8 res[8]; /* 0x018 - 0x01c reserved */ | |
37 | __be32 csmode[4]; /* 0x020 - 0x02c eSPI cs mode register */ | |
38 | }; | |
39 | ||
40 | struct fsl_espi_transfer { | |
41 | const void *tx_buf; | |
42 | void *rx_buf; | |
43 | unsigned len; | |
44 | unsigned n_tx; | |
45 | unsigned n_rx; | |
46 | unsigned actual_length; | |
47 | int status; | |
48 | }; | |
49 | ||
50 | /* eSPI Controller mode register definitions */ | |
51 | #define SPMODE_ENABLE (1 << 31) | |
52 | #define SPMODE_LOOP (1 << 30) | |
53 | #define SPMODE_TXTHR(x) ((x) << 8) | |
54 | #define SPMODE_RXTHR(x) ((x) << 0) | |
55 | ||
56 | /* eSPI Controller CS mode register definitions */ | |
57 | #define CSMODE_CI_INACTIVEHIGH (1 << 31) | |
58 | #define CSMODE_CP_BEGIN_EDGECLK (1 << 30) | |
59 | #define CSMODE_REV (1 << 29) | |
60 | #define CSMODE_DIV16 (1 << 28) | |
61 | #define CSMODE_PM(x) ((x) << 24) | |
62 | #define CSMODE_POL_1 (1 << 20) | |
63 | #define CSMODE_LEN(x) ((x) << 16) | |
64 | #define CSMODE_BEF(x) ((x) << 12) | |
65 | #define CSMODE_AFT(x) ((x) << 8) | |
66 | #define CSMODE_CG(x) ((x) << 3) | |
67 | ||
68 | /* Default mode/csmode for eSPI controller */ | |
69 | #define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(3)) | |
70 | #define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \ | |
71 | | CSMODE_AFT(0) | CSMODE_CG(1)) | |
72 | ||
73 | /* SPIE register values */ | |
74 | #define SPIE_NE 0x00000200 /* Not empty */ | |
75 | #define SPIE_NF 0x00000100 /* Not full */ | |
76 | ||
77 | /* SPIM register values */ | |
78 | #define SPIM_NE 0x00000200 /* Not empty */ | |
79 | #define SPIM_NF 0x00000100 /* Not full */ | |
80 | #define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F) | |
81 | #define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F) | |
82 | ||
83 | /* SPCOM register values */ | |
84 | #define SPCOM_CS(x) ((x) << 30) | |
85 | #define SPCOM_TRANLEN(x) ((x) << 0) | |
86 | #define SPCOM_TRANLEN_MAX 0xFFFF /* Max transaction length */ | |
87 | ||
88 | static void fsl_espi_change_mode(struct spi_device *spi) | |
89 | { | |
90 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); | |
91 | struct spi_mpc8xxx_cs *cs = spi->controller_state; | |
92 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
93 | __be32 __iomem *mode = ®_base->csmode[spi->chip_select]; | |
94 | __be32 __iomem *espi_mode = ®_base->mode; | |
95 | u32 tmp; | |
96 | unsigned long flags; | |
97 | ||
98 | /* Turn off IRQs locally to minimize time that SPI is disabled. */ | |
99 | local_irq_save(flags); | |
100 | ||
101 | /* Turn off SPI unit prior changing mode */ | |
102 | tmp = mpc8xxx_spi_read_reg(espi_mode); | |
103 | mpc8xxx_spi_write_reg(espi_mode, tmp & ~SPMODE_ENABLE); | |
104 | mpc8xxx_spi_write_reg(mode, cs->hw_mode); | |
105 | mpc8xxx_spi_write_reg(espi_mode, tmp); | |
106 | ||
107 | local_irq_restore(flags); | |
108 | } | |
109 | ||
110 | static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi) | |
111 | { | |
112 | u32 data; | |
113 | u16 data_h; | |
114 | u16 data_l; | |
115 | const u32 *tx = mpc8xxx_spi->tx; | |
116 | ||
117 | if (!tx) | |
118 | return 0; | |
119 | ||
120 | data = *tx++ << mpc8xxx_spi->tx_shift; | |
121 | data_l = data & 0xffff; | |
122 | data_h = (data >> 16) & 0xffff; | |
123 | swab16s(&data_l); | |
124 | swab16s(&data_h); | |
125 | data = data_h | data_l; | |
126 | ||
127 | mpc8xxx_spi->tx = tx; | |
128 | return data; | |
129 | } | |
130 | ||
131 | static int fsl_espi_setup_transfer(struct spi_device *spi, | |
132 | struct spi_transfer *t) | |
133 | { | |
134 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); | |
135 | int bits_per_word = 0; | |
136 | u8 pm; | |
137 | u32 hz = 0; | |
138 | struct spi_mpc8xxx_cs *cs = spi->controller_state; | |
139 | ||
140 | if (t) { | |
141 | bits_per_word = t->bits_per_word; | |
142 | hz = t->speed_hz; | |
143 | } | |
144 | ||
145 | /* spi_transfer level calls that work per-word */ | |
146 | if (!bits_per_word) | |
147 | bits_per_word = spi->bits_per_word; | |
148 | ||
8b60d6c2 MH |
149 | if (!hz) |
150 | hz = spi->max_speed_hz; | |
151 | ||
152 | cs->rx_shift = 0; | |
153 | cs->tx_shift = 0; | |
154 | cs->get_rx = mpc8xxx_spi_rx_buf_u32; | |
155 | cs->get_tx = mpc8xxx_spi_tx_buf_u32; | |
156 | if (bits_per_word <= 8) { | |
157 | cs->rx_shift = 8 - bits_per_word; | |
51faed69 | 158 | } else { |
8b60d6c2 MH |
159 | cs->rx_shift = 16 - bits_per_word; |
160 | if (spi->mode & SPI_LSB_FIRST) | |
161 | cs->get_tx = fsl_espi_tx_buf_lsb; | |
8b60d6c2 MH |
162 | } |
163 | ||
164 | mpc8xxx_spi->rx_shift = cs->rx_shift; | |
165 | mpc8xxx_spi->tx_shift = cs->tx_shift; | |
166 | mpc8xxx_spi->get_rx = cs->get_rx; | |
167 | mpc8xxx_spi->get_tx = cs->get_tx; | |
168 | ||
169 | bits_per_word = bits_per_word - 1; | |
170 | ||
171 | /* mask out bits we are going to set */ | |
172 | cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF)); | |
173 | ||
174 | cs->hw_mode |= CSMODE_LEN(bits_per_word); | |
175 | ||
176 | if ((mpc8xxx_spi->spibrg / hz) > 64) { | |
177 | cs->hw_mode |= CSMODE_DIV16; | |
35faa55c | 178 | pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4); |
8b60d6c2 | 179 | |
87bf5ab8 | 180 | WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. " |
8b60d6c2 | 181 | "Will use %d Hz instead.\n", dev_name(&spi->dev), |
87bf5ab8 SAS |
182 | hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1))); |
183 | if (pm > 33) | |
184 | pm = 33; | |
8b60d6c2 | 185 | } else { |
35faa55c | 186 | pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4); |
8b60d6c2 MH |
187 | } |
188 | if (pm) | |
189 | pm--; | |
87bf5ab8 SAS |
190 | if (pm < 2) |
191 | pm = 2; | |
8b60d6c2 MH |
192 | |
193 | cs->hw_mode |= CSMODE_PM(pm); | |
194 | ||
195 | fsl_espi_change_mode(spi); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t, | |
200 | unsigned int len) | |
201 | { | |
202 | u32 word; | |
203 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
204 | ||
205 | mspi->count = len; | |
206 | ||
207 | /* enable rx ints */ | |
208 | mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); | |
209 | ||
210 | /* transmit word */ | |
211 | word = mspi->get_tx(mspi); | |
212 | mpc8xxx_spi_write_reg(®_base->transmit, word); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) | |
218 | { | |
219 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); | |
220 | struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; | |
221 | unsigned int len = t->len; | |
8b60d6c2 MH |
222 | int ret; |
223 | ||
8b60d6c2 MH |
224 | mpc8xxx_spi->len = t->len; |
225 | len = roundup(len, 4) / 4; | |
226 | ||
227 | mpc8xxx_spi->tx = t->tx_buf; | |
228 | mpc8xxx_spi->rx = t->rx_buf; | |
229 | ||
16735d02 | 230 | reinit_completion(&mpc8xxx_spi->done); |
8b60d6c2 MH |
231 | |
232 | /* Set SPCOM[CS] and SPCOM[TRANLEN] field */ | |
233 | if ((t->len - 1) > SPCOM_TRANLEN_MAX) { | |
234 | dev_err(mpc8xxx_spi->dev, "Transaction length (%d)" | |
235 | " beyond the SPCOM[TRANLEN] field\n", t->len); | |
236 | return -EINVAL; | |
237 | } | |
238 | mpc8xxx_spi_write_reg(®_base->command, | |
239 | (SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1))); | |
240 | ||
241 | ret = fsl_espi_cpu_bufs(mpc8xxx_spi, t, len); | |
242 | if (ret) | |
243 | return ret; | |
244 | ||
245 | wait_for_completion(&mpc8xxx_spi->done); | |
246 | ||
247 | /* disable rx ints */ | |
248 | mpc8xxx_spi_write_reg(®_base->mask, 0); | |
249 | ||
250 | return mpc8xxx_spi->count; | |
251 | } | |
252 | ||
0dd2c96f | 253 | static inline void fsl_espi_addr2cmd(unsigned int addr, u8 *cmd) |
8b60d6c2 | 254 | { |
0dd2c96f | 255 | if (cmd) { |
8b60d6c2 MH |
256 | cmd[1] = (u8)(addr >> 16); |
257 | cmd[2] = (u8)(addr >> 8); | |
258 | cmd[3] = (u8)(addr >> 0); | |
259 | } | |
260 | } | |
261 | ||
0dd2c96f | 262 | static inline unsigned int fsl_espi_cmd2addr(u8 *cmd) |
8b60d6c2 | 263 | { |
0dd2c96f | 264 | if (cmd) |
8b60d6c2 MH |
265 | return cmd[1] << 16 | cmd[2] << 8 | cmd[3] << 0; |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static void fsl_espi_do_trans(struct spi_message *m, | |
271 | struct fsl_espi_transfer *tr) | |
272 | { | |
273 | struct spi_device *spi = m->spi; | |
274 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); | |
275 | struct fsl_espi_transfer *espi_trans = tr; | |
276 | struct spi_message message; | |
277 | struct spi_transfer *t, *first, trans; | |
278 | int status = 0; | |
279 | ||
280 | spi_message_init(&message); | |
281 | memset(&trans, 0, sizeof(trans)); | |
282 | ||
283 | first = list_first_entry(&m->transfers, struct spi_transfer, | |
284 | transfer_list); | |
285 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
286 | if ((first->bits_per_word != t->bits_per_word) || | |
287 | (first->speed_hz != t->speed_hz)) { | |
288 | espi_trans->status = -EINVAL; | |
f6bd03a7 JN |
289 | dev_err(mspi->dev, |
290 | "bits_per_word/speed_hz should be same for the same SPI transfer\n"); | |
8b60d6c2 MH |
291 | return; |
292 | } | |
293 | ||
294 | trans.speed_hz = t->speed_hz; | |
295 | trans.bits_per_word = t->bits_per_word; | |
296 | trans.delay_usecs = max(first->delay_usecs, t->delay_usecs); | |
297 | } | |
298 | ||
299 | trans.len = espi_trans->len; | |
300 | trans.tx_buf = espi_trans->tx_buf; | |
301 | trans.rx_buf = espi_trans->rx_buf; | |
302 | spi_message_add_tail(&trans, &message); | |
303 | ||
304 | list_for_each_entry(t, &message.transfers, transfer_list) { | |
305 | if (t->bits_per_word || t->speed_hz) { | |
306 | status = -EINVAL; | |
307 | ||
308 | status = fsl_espi_setup_transfer(spi, t); | |
309 | if (status < 0) | |
310 | break; | |
311 | } | |
312 | ||
313 | if (t->len) | |
314 | status = fsl_espi_bufs(spi, t); | |
315 | ||
316 | if (status) { | |
317 | status = -EMSGSIZE; | |
318 | break; | |
319 | } | |
320 | ||
321 | if (t->delay_usecs) | |
322 | udelay(t->delay_usecs); | |
323 | } | |
324 | ||
325 | espi_trans->status = status; | |
326 | fsl_espi_setup_transfer(spi, NULL); | |
327 | } | |
328 | ||
329 | static void fsl_espi_cmd_trans(struct spi_message *m, | |
330 | struct fsl_espi_transfer *trans, u8 *rx_buff) | |
331 | { | |
332 | struct spi_transfer *t; | |
333 | u8 *local_buf; | |
334 | int i = 0; | |
335 | struct fsl_espi_transfer *espi_trans = trans; | |
336 | ||
337 | local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); | |
338 | if (!local_buf) { | |
339 | espi_trans->status = -ENOMEM; | |
340 | return; | |
341 | } | |
342 | ||
343 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
344 | if (t->tx_buf) { | |
345 | memcpy(local_buf + i, t->tx_buf, t->len); | |
346 | i += t->len; | |
347 | } | |
348 | } | |
349 | ||
350 | espi_trans->tx_buf = local_buf; | |
351 | espi_trans->rx_buf = local_buf + espi_trans->n_tx; | |
352 | fsl_espi_do_trans(m, espi_trans); | |
353 | ||
354 | espi_trans->actual_length = espi_trans->len; | |
355 | kfree(local_buf); | |
356 | } | |
357 | ||
358 | static void fsl_espi_rw_trans(struct spi_message *m, | |
359 | struct fsl_espi_transfer *trans, u8 *rx_buff) | |
360 | { | |
361 | struct fsl_espi_transfer *espi_trans = trans; | |
362 | unsigned int n_tx = espi_trans->n_tx; | |
363 | unsigned int n_rx = espi_trans->n_rx; | |
364 | struct spi_transfer *t; | |
365 | u8 *local_buf; | |
366 | u8 *rx_buf = rx_buff; | |
367 | unsigned int trans_len; | |
368 | unsigned int addr; | |
369 | int i, pos, loop; | |
370 | ||
371 | local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); | |
372 | if (!local_buf) { | |
373 | espi_trans->status = -ENOMEM; | |
374 | return; | |
375 | } | |
376 | ||
377 | for (pos = 0, loop = 0; pos < n_rx; pos += trans_len, loop++) { | |
378 | trans_len = n_rx - pos; | |
379 | if (trans_len > SPCOM_TRANLEN_MAX - n_tx) | |
380 | trans_len = SPCOM_TRANLEN_MAX - n_tx; | |
381 | ||
382 | i = 0; | |
383 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
384 | if (t->tx_buf) { | |
385 | memcpy(local_buf + i, t->tx_buf, t->len); | |
386 | i += t->len; | |
387 | } | |
388 | } | |
389 | ||
0dd2c96f MH |
390 | if (pos > 0) { |
391 | addr = fsl_espi_cmd2addr(local_buf); | |
392 | addr += pos; | |
393 | fsl_espi_addr2cmd(addr, local_buf); | |
394 | } | |
8b60d6c2 MH |
395 | |
396 | espi_trans->n_tx = n_tx; | |
397 | espi_trans->n_rx = trans_len; | |
398 | espi_trans->len = trans_len + n_tx; | |
399 | espi_trans->tx_buf = local_buf; | |
400 | espi_trans->rx_buf = local_buf + n_tx; | |
401 | fsl_espi_do_trans(m, espi_trans); | |
402 | ||
403 | memcpy(rx_buf + pos, espi_trans->rx_buf + n_tx, trans_len); | |
404 | ||
405 | if (loop > 0) | |
406 | espi_trans->actual_length += espi_trans->len - n_tx; | |
407 | else | |
408 | espi_trans->actual_length += espi_trans->len; | |
409 | } | |
410 | ||
411 | kfree(local_buf); | |
412 | } | |
413 | ||
414 | static void fsl_espi_do_one_msg(struct spi_message *m) | |
415 | { | |
416 | struct spi_transfer *t; | |
417 | u8 *rx_buf = NULL; | |
418 | unsigned int n_tx = 0; | |
419 | unsigned int n_rx = 0; | |
420 | struct fsl_espi_transfer espi_trans; | |
421 | ||
422 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
423 | if (t->tx_buf) | |
424 | n_tx += t->len; | |
425 | if (t->rx_buf) { | |
426 | n_rx += t->len; | |
427 | rx_buf = t->rx_buf; | |
428 | } | |
429 | } | |
430 | ||
431 | espi_trans.n_tx = n_tx; | |
432 | espi_trans.n_rx = n_rx; | |
433 | espi_trans.len = n_tx + n_rx; | |
434 | espi_trans.actual_length = 0; | |
435 | espi_trans.status = 0; | |
436 | ||
437 | if (!rx_buf) | |
438 | fsl_espi_cmd_trans(m, &espi_trans, NULL); | |
439 | else | |
440 | fsl_espi_rw_trans(m, &espi_trans, rx_buf); | |
441 | ||
442 | m->actual_length = espi_trans.actual_length; | |
443 | m->status = espi_trans.status; | |
0a6d3879 AL |
444 | if (m->complete) |
445 | m->complete(m->context); | |
8b60d6c2 MH |
446 | } |
447 | ||
448 | static int fsl_espi_setup(struct spi_device *spi) | |
449 | { | |
450 | struct mpc8xxx_spi *mpc8xxx_spi; | |
451 | struct fsl_espi_reg *reg_base; | |
452 | int retval; | |
453 | u32 hw_mode; | |
454 | u32 loop_mode; | |
455 | struct spi_mpc8xxx_cs *cs = spi->controller_state; | |
456 | ||
457 | if (!spi->max_speed_hz) | |
458 | return -EINVAL; | |
459 | ||
460 | if (!cs) { | |
461 | cs = kzalloc(sizeof *cs, GFP_KERNEL); | |
462 | if (!cs) | |
463 | return -ENOMEM; | |
464 | spi->controller_state = cs; | |
465 | } | |
466 | ||
467 | mpc8xxx_spi = spi_master_get_devdata(spi->master); | |
468 | reg_base = mpc8xxx_spi->reg_base; | |
469 | ||
25985edc | 470 | hw_mode = cs->hw_mode; /* Save original settings */ |
8b60d6c2 MH |
471 | cs->hw_mode = mpc8xxx_spi_read_reg( |
472 | ®_base->csmode[spi->chip_select]); | |
473 | /* mask out bits we are going to set */ | |
474 | cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH | |
475 | | CSMODE_REV); | |
476 | ||
477 | if (spi->mode & SPI_CPHA) | |
478 | cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK; | |
479 | if (spi->mode & SPI_CPOL) | |
480 | cs->hw_mode |= CSMODE_CI_INACTIVEHIGH; | |
481 | if (!(spi->mode & SPI_LSB_FIRST)) | |
482 | cs->hw_mode |= CSMODE_REV; | |
483 | ||
484 | /* Handle the loop mode */ | |
485 | loop_mode = mpc8xxx_spi_read_reg(®_base->mode); | |
486 | loop_mode &= ~SPMODE_LOOP; | |
487 | if (spi->mode & SPI_LOOP) | |
488 | loop_mode |= SPMODE_LOOP; | |
489 | mpc8xxx_spi_write_reg(®_base->mode, loop_mode); | |
490 | ||
491 | retval = fsl_espi_setup_transfer(spi, NULL); | |
492 | if (retval < 0) { | |
493 | cs->hw_mode = hw_mode; /* Restore settings */ | |
494 | return retval; | |
495 | } | |
496 | return 0; | |
497 | } | |
498 | ||
499 | void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) | |
500 | { | |
501 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
502 | ||
503 | /* We need handle RX first */ | |
504 | if (events & SPIE_NE) { | |
e6289d63 MH |
505 | u32 rx_data, tmp; |
506 | u8 rx_data_8; | |
8b60d6c2 MH |
507 | |
508 | /* Spin until RX is done */ | |
509 | while (SPIE_RXCNT(events) < min(4, mspi->len)) { | |
510 | cpu_relax(); | |
511 | events = mpc8xxx_spi_read_reg(®_base->event); | |
512 | } | |
8b60d6c2 | 513 | |
e6289d63 MH |
514 | if (mspi->len >= 4) { |
515 | rx_data = mpc8xxx_spi_read_reg(®_base->receive); | |
516 | } else { | |
517 | tmp = mspi->len; | |
518 | rx_data = 0; | |
519 | while (tmp--) { | |
520 | rx_data_8 = in_8((u8 *)®_base->receive); | |
521 | rx_data |= (rx_data_8 << (tmp * 8)); | |
522 | } | |
523 | ||
524 | rx_data <<= (4 - mspi->len) * 8; | |
525 | } | |
526 | ||
527 | mspi->len -= 4; | |
8b60d6c2 MH |
528 | |
529 | if (mspi->rx) | |
530 | mspi->get_rx(rx_data, mspi); | |
531 | } | |
532 | ||
533 | if (!(events & SPIE_NF)) { | |
534 | int ret; | |
535 | ||
536 | /* spin until TX is done */ | |
537 | ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg( | |
538 | ®_base->event)) & SPIE_NF) == 0, 1000, 0); | |
539 | if (!ret) { | |
540 | dev_err(mspi->dev, "tired waiting for SPIE_NF\n"); | |
541 | return; | |
542 | } | |
543 | } | |
544 | ||
545 | /* Clear the events */ | |
546 | mpc8xxx_spi_write_reg(®_base->event, events); | |
547 | ||
548 | mspi->count -= 1; | |
549 | if (mspi->count) { | |
550 | u32 word = mspi->get_tx(mspi); | |
551 | ||
552 | mpc8xxx_spi_write_reg(®_base->transmit, word); | |
553 | } else { | |
554 | complete(&mspi->done); | |
555 | } | |
556 | } | |
557 | ||
558 | static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) | |
559 | { | |
560 | struct mpc8xxx_spi *mspi = context_data; | |
561 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
562 | irqreturn_t ret = IRQ_NONE; | |
563 | u32 events; | |
564 | ||
565 | /* Get interrupt events(tx/rx) */ | |
566 | events = mpc8xxx_spi_read_reg(®_base->event); | |
567 | if (events) | |
568 | ret = IRQ_HANDLED; | |
569 | ||
570 | dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events); | |
571 | ||
572 | fsl_espi_cpu_irq(mspi, events); | |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
577 | static void fsl_espi_remove(struct mpc8xxx_spi *mspi) | |
578 | { | |
579 | iounmap(mspi->reg_base); | |
580 | } | |
581 | ||
fd4a319b | 582 | static struct spi_master * fsl_espi_probe(struct device *dev, |
8b60d6c2 MH |
583 | struct resource *mem, unsigned int irq) |
584 | { | |
8074cf06 | 585 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
8b60d6c2 MH |
586 | struct spi_master *master; |
587 | struct mpc8xxx_spi *mpc8xxx_spi; | |
588 | struct fsl_espi_reg *reg_base; | |
589 | u32 regval; | |
590 | int i, ret = 0; | |
591 | ||
592 | master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); | |
593 | if (!master) { | |
594 | ret = -ENOMEM; | |
595 | goto err; | |
596 | } | |
597 | ||
598 | dev_set_drvdata(dev, master); | |
599 | ||
600 | ret = mpc8xxx_spi_probe(dev, mem, irq); | |
601 | if (ret) | |
602 | goto err_probe; | |
603 | ||
24778be2 | 604 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); |
8b60d6c2 MH |
605 | master->setup = fsl_espi_setup; |
606 | ||
607 | mpc8xxx_spi = spi_master_get_devdata(master); | |
608 | mpc8xxx_spi->spi_do_one_msg = fsl_espi_do_one_msg; | |
609 | mpc8xxx_spi->spi_remove = fsl_espi_remove; | |
610 | ||
611 | mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem)); | |
612 | if (!mpc8xxx_spi->reg_base) { | |
613 | ret = -ENOMEM; | |
614 | goto err_probe; | |
615 | } | |
616 | ||
617 | reg_base = mpc8xxx_spi->reg_base; | |
618 | ||
619 | /* Register for SPI Interrupt */ | |
620 | ret = request_irq(mpc8xxx_spi->irq, fsl_espi_irq, | |
621 | 0, "fsl_espi", mpc8xxx_spi); | |
622 | if (ret) | |
623 | goto free_irq; | |
624 | ||
625 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { | |
626 | mpc8xxx_spi->rx_shift = 16; | |
627 | mpc8xxx_spi->tx_shift = 24; | |
628 | } | |
629 | ||
630 | /* SPI controller initializations */ | |
631 | mpc8xxx_spi_write_reg(®_base->mode, 0); | |
632 | mpc8xxx_spi_write_reg(®_base->mask, 0); | |
633 | mpc8xxx_spi_write_reg(®_base->command, 0); | |
634 | mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); | |
635 | ||
636 | /* Init eSPI CS mode register */ | |
637 | for (i = 0; i < pdata->max_chipselect; i++) | |
638 | mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL); | |
639 | ||
640 | /* Enable SPI interface */ | |
641 | regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; | |
642 | ||
643 | mpc8xxx_spi_write_reg(®_base->mode, regval); | |
644 | ||
645 | ret = spi_register_master(master); | |
646 | if (ret < 0) | |
647 | goto unreg_master; | |
648 | ||
649 | dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq); | |
650 | ||
651 | return master; | |
652 | ||
653 | unreg_master: | |
654 | free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); | |
655 | free_irq: | |
656 | iounmap(mpc8xxx_spi->reg_base); | |
657 | err_probe: | |
658 | spi_master_put(master); | |
659 | err: | |
660 | return ERR_PTR(ret); | |
661 | } | |
662 | ||
663 | static int of_fsl_espi_get_chipselects(struct device *dev) | |
664 | { | |
665 | struct device_node *np = dev->of_node; | |
8074cf06 | 666 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
8b60d6c2 MH |
667 | const u32 *prop; |
668 | int len; | |
669 | ||
670 | prop = of_get_property(np, "fsl,espi-num-chipselects", &len); | |
671 | if (!prop || len < sizeof(*prop)) { | |
672 | dev_err(dev, "No 'fsl,espi-num-chipselects' property\n"); | |
673 | return -EINVAL; | |
674 | } | |
675 | ||
676 | pdata->max_chipselect = *prop; | |
677 | pdata->cs_control = NULL; | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
fd4a319b | 682 | static int of_fsl_espi_probe(struct platform_device *ofdev) |
8b60d6c2 MH |
683 | { |
684 | struct device *dev = &ofdev->dev; | |
685 | struct device_node *np = ofdev->dev.of_node; | |
686 | struct spi_master *master; | |
687 | struct resource mem; | |
f7578496 | 688 | unsigned int irq; |
8b60d6c2 MH |
689 | int ret = -ENOMEM; |
690 | ||
18d306d1 | 691 | ret = of_mpc8xxx_spi_probe(ofdev); |
8b60d6c2 MH |
692 | if (ret) |
693 | return ret; | |
694 | ||
695 | ret = of_fsl_espi_get_chipselects(dev); | |
696 | if (ret) | |
697 | goto err; | |
698 | ||
699 | ret = of_address_to_resource(np, 0, &mem); | |
700 | if (ret) | |
701 | goto err; | |
702 | ||
f7578496 | 703 | irq = irq_of_parse_and_map(np, 0); |
7227cd18 | 704 | if (!irq) { |
8b60d6c2 MH |
705 | ret = -EINVAL; |
706 | goto err; | |
707 | } | |
708 | ||
f7578496 | 709 | master = fsl_espi_probe(dev, &mem, irq); |
8b60d6c2 MH |
710 | if (IS_ERR(master)) { |
711 | ret = PTR_ERR(master); | |
712 | goto err; | |
713 | } | |
714 | ||
715 | return 0; | |
716 | ||
717 | err: | |
718 | return ret; | |
719 | } | |
720 | ||
fd4a319b | 721 | static int of_fsl_espi_remove(struct platform_device *dev) |
8b60d6c2 MH |
722 | { |
723 | return mpc8xxx_spi_remove(&dev->dev); | |
724 | } | |
725 | ||
714bb654 HZ |
726 | #ifdef CONFIG_PM_SLEEP |
727 | static int of_fsl_espi_suspend(struct device *dev) | |
728 | { | |
729 | struct spi_master *master = dev_get_drvdata(dev); | |
730 | struct mpc8xxx_spi *mpc8xxx_spi; | |
731 | struct fsl_espi_reg *reg_base; | |
732 | u32 regval; | |
733 | int ret; | |
734 | ||
735 | mpc8xxx_spi = spi_master_get_devdata(master); | |
736 | reg_base = mpc8xxx_spi->reg_base; | |
737 | ||
738 | ret = spi_master_suspend(master); | |
739 | if (ret) { | |
740 | dev_warn(dev, "cannot suspend master\n"); | |
741 | return ret; | |
742 | } | |
743 | ||
744 | regval = mpc8xxx_spi_read_reg(®_base->mode); | |
745 | regval &= ~SPMODE_ENABLE; | |
746 | mpc8xxx_spi_write_reg(®_base->mode, regval); | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
751 | static int of_fsl_espi_resume(struct device *dev) | |
752 | { | |
753 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); | |
754 | struct spi_master *master = dev_get_drvdata(dev); | |
755 | struct mpc8xxx_spi *mpc8xxx_spi; | |
756 | struct fsl_espi_reg *reg_base; | |
757 | u32 regval; | |
758 | int i; | |
759 | ||
760 | mpc8xxx_spi = spi_master_get_devdata(master); | |
761 | reg_base = mpc8xxx_spi->reg_base; | |
762 | ||
763 | /* SPI controller initializations */ | |
764 | mpc8xxx_spi_write_reg(®_base->mode, 0); | |
765 | mpc8xxx_spi_write_reg(®_base->mask, 0); | |
766 | mpc8xxx_spi_write_reg(®_base->command, 0); | |
767 | mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); | |
768 | ||
769 | /* Init eSPI CS mode register */ | |
770 | for (i = 0; i < pdata->max_chipselect; i++) | |
771 | mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL); | |
772 | ||
773 | /* Enable SPI interface */ | |
774 | regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; | |
775 | ||
776 | mpc8xxx_spi_write_reg(®_base->mode, regval); | |
777 | ||
778 | return spi_master_resume(master); | |
779 | } | |
780 | #endif /* CONFIG_PM_SLEEP */ | |
781 | ||
782 | static const struct dev_pm_ops espi_pm = { | |
783 | SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume) | |
784 | }; | |
785 | ||
8b60d6c2 MH |
786 | static const struct of_device_id of_fsl_espi_match[] = { |
787 | { .compatible = "fsl,mpc8536-espi" }, | |
788 | {} | |
789 | }; | |
790 | MODULE_DEVICE_TABLE(of, of_fsl_espi_match); | |
791 | ||
18d306d1 | 792 | static struct platform_driver fsl_espi_driver = { |
8b60d6c2 MH |
793 | .driver = { |
794 | .name = "fsl_espi", | |
795 | .owner = THIS_MODULE, | |
796 | .of_match_table = of_fsl_espi_match, | |
714bb654 | 797 | .pm = &espi_pm, |
8b60d6c2 MH |
798 | }, |
799 | .probe = of_fsl_espi_probe, | |
fd4a319b | 800 | .remove = of_fsl_espi_remove, |
8b60d6c2 | 801 | }; |
940ab889 | 802 | module_platform_driver(fsl_espi_driver); |
8b60d6c2 MH |
803 | |
804 | MODULE_AUTHOR("Mingkai Hu"); | |
805 | MODULE_DESCRIPTION("Enhanced Freescale SPI Driver"); | |
806 | MODULE_LICENSE("GPL"); |