Commit | Line | Data |
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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 | */ | |
8b60d6c2 | 11 | #include <linux/delay.h> |
a3108360 | 12 | #include <linux/err.h> |
8b60d6c2 | 13 | #include <linux/fsl_devices.h> |
a3108360 XL |
14 | #include <linux/interrupt.h> |
15 | #include <linux/irq.h> | |
16 | #include <linux/module.h> | |
8b60d6c2 MH |
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> |
a3108360 XL |
22 | #include <linux/platform_device.h> |
23 | #include <linux/spi/spi.h> | |
e9abb4db | 24 | #include <linux/pm_runtime.h> |
8b60d6c2 MH |
25 | #include <sysdev/fsl_soc.h> |
26 | ||
ca632f55 | 27 | #include "spi-fsl-lib.h" |
8b60d6c2 MH |
28 | |
29 | /* eSPI Controller registers */ | |
30 | struct fsl_espi_reg { | |
31 | __be32 mode; /* 0x000 - eSPI mode register */ | |
32 | __be32 event; /* 0x004 - eSPI event register */ | |
33 | __be32 mask; /* 0x008 - eSPI mask register */ | |
34 | __be32 command; /* 0x00c - eSPI command register */ | |
35 | __be32 transmit; /* 0x010 - eSPI transmit FIFO access register*/ | |
36 | __be32 receive; /* 0x014 - eSPI receive FIFO access register*/ | |
37 | u8 res[8]; /* 0x018 - 0x01c reserved */ | |
38 | __be32 csmode[4]; /* 0x020 - 0x02c eSPI cs mode register */ | |
39 | }; | |
40 | ||
41 | struct fsl_espi_transfer { | |
42 | const void *tx_buf; | |
43 | void *rx_buf; | |
44 | unsigned len; | |
45 | unsigned n_tx; | |
46 | unsigned n_rx; | |
47 | unsigned actual_length; | |
48 | int status; | |
49 | }; | |
50 | ||
51 | /* eSPI Controller mode register definitions */ | |
52 | #define SPMODE_ENABLE (1 << 31) | |
53 | #define SPMODE_LOOP (1 << 30) | |
54 | #define SPMODE_TXTHR(x) ((x) << 8) | |
55 | #define SPMODE_RXTHR(x) ((x) << 0) | |
56 | ||
57 | /* eSPI Controller CS mode register definitions */ | |
58 | #define CSMODE_CI_INACTIVEHIGH (1 << 31) | |
59 | #define CSMODE_CP_BEGIN_EDGECLK (1 << 30) | |
60 | #define CSMODE_REV (1 << 29) | |
61 | #define CSMODE_DIV16 (1 << 28) | |
62 | #define CSMODE_PM(x) ((x) << 24) | |
63 | #define CSMODE_POL_1 (1 << 20) | |
64 | #define CSMODE_LEN(x) ((x) << 16) | |
65 | #define CSMODE_BEF(x) ((x) << 12) | |
66 | #define CSMODE_AFT(x) ((x) << 8) | |
67 | #define CSMODE_CG(x) ((x) << 3) | |
68 | ||
69 | /* Default mode/csmode for eSPI controller */ | |
70 | #define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(3)) | |
71 | #define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \ | |
72 | | CSMODE_AFT(0) | CSMODE_CG(1)) | |
73 | ||
74 | /* SPIE register values */ | |
75 | #define SPIE_NE 0x00000200 /* Not empty */ | |
76 | #define SPIE_NF 0x00000100 /* Not full */ | |
77 | ||
78 | /* SPIM register values */ | |
79 | #define SPIM_NE 0x00000200 /* Not empty */ | |
80 | #define SPIM_NF 0x00000100 /* Not full */ | |
81 | #define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F) | |
82 | #define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F) | |
83 | ||
84 | /* SPCOM register values */ | |
85 | #define SPCOM_CS(x) ((x) << 30) | |
86 | #define SPCOM_TRANLEN(x) ((x) << 0) | |
5cfa1e4e | 87 | #define SPCOM_TRANLEN_MAX 0x10000 /* Max transaction length */ |
8b60d6c2 | 88 | |
e9abb4db HK |
89 | #define AUTOSUSPEND_TIMEOUT 2000 |
90 | ||
8b60d6c2 MH |
91 | static void fsl_espi_change_mode(struct spi_device *spi) |
92 | { | |
93 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); | |
94 | struct spi_mpc8xxx_cs *cs = spi->controller_state; | |
95 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
96 | __be32 __iomem *mode = ®_base->csmode[spi->chip_select]; | |
97 | __be32 __iomem *espi_mode = ®_base->mode; | |
98 | u32 tmp; | |
99 | unsigned long flags; | |
100 | ||
101 | /* Turn off IRQs locally to minimize time that SPI is disabled. */ | |
102 | local_irq_save(flags); | |
103 | ||
104 | /* Turn off SPI unit prior changing mode */ | |
105 | tmp = mpc8xxx_spi_read_reg(espi_mode); | |
106 | mpc8xxx_spi_write_reg(espi_mode, tmp & ~SPMODE_ENABLE); | |
107 | mpc8xxx_spi_write_reg(mode, cs->hw_mode); | |
108 | mpc8xxx_spi_write_reg(espi_mode, tmp); | |
109 | ||
110 | local_irq_restore(flags); | |
111 | } | |
112 | ||
113 | static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi) | |
114 | { | |
115 | u32 data; | |
116 | u16 data_h; | |
117 | u16 data_l; | |
118 | const u32 *tx = mpc8xxx_spi->tx; | |
119 | ||
120 | if (!tx) | |
121 | return 0; | |
122 | ||
123 | data = *tx++ << mpc8xxx_spi->tx_shift; | |
124 | data_l = data & 0xffff; | |
125 | data_h = (data >> 16) & 0xffff; | |
126 | swab16s(&data_l); | |
127 | swab16s(&data_h); | |
128 | data = data_h | data_l; | |
129 | ||
130 | mpc8xxx_spi->tx = tx; | |
131 | return data; | |
132 | } | |
133 | ||
134 | static int fsl_espi_setup_transfer(struct spi_device *spi, | |
135 | struct spi_transfer *t) | |
136 | { | |
137 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); | |
138 | int bits_per_word = 0; | |
139 | u8 pm; | |
140 | u32 hz = 0; | |
141 | struct spi_mpc8xxx_cs *cs = spi->controller_state; | |
142 | ||
143 | if (t) { | |
144 | bits_per_word = t->bits_per_word; | |
145 | hz = t->speed_hz; | |
146 | } | |
147 | ||
148 | /* spi_transfer level calls that work per-word */ | |
149 | if (!bits_per_word) | |
150 | bits_per_word = spi->bits_per_word; | |
151 | ||
8b60d6c2 MH |
152 | if (!hz) |
153 | hz = spi->max_speed_hz; | |
154 | ||
155 | cs->rx_shift = 0; | |
156 | cs->tx_shift = 0; | |
157 | cs->get_rx = mpc8xxx_spi_rx_buf_u32; | |
158 | cs->get_tx = mpc8xxx_spi_tx_buf_u32; | |
159 | if (bits_per_word <= 8) { | |
160 | cs->rx_shift = 8 - bits_per_word; | |
51faed69 | 161 | } else { |
8b60d6c2 MH |
162 | cs->rx_shift = 16 - bits_per_word; |
163 | if (spi->mode & SPI_LSB_FIRST) | |
164 | cs->get_tx = fsl_espi_tx_buf_lsb; | |
8b60d6c2 MH |
165 | } |
166 | ||
167 | mpc8xxx_spi->rx_shift = cs->rx_shift; | |
168 | mpc8xxx_spi->tx_shift = cs->tx_shift; | |
169 | mpc8xxx_spi->get_rx = cs->get_rx; | |
170 | mpc8xxx_spi->get_tx = cs->get_tx; | |
171 | ||
172 | bits_per_word = bits_per_word - 1; | |
173 | ||
174 | /* mask out bits we are going to set */ | |
175 | cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF)); | |
176 | ||
177 | cs->hw_mode |= CSMODE_LEN(bits_per_word); | |
178 | ||
179 | if ((mpc8xxx_spi->spibrg / hz) > 64) { | |
180 | cs->hw_mode |= CSMODE_DIV16; | |
35faa55c | 181 | pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4); |
8b60d6c2 | 182 | |
87bf5ab8 | 183 | WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. " |
8b60d6c2 | 184 | "Will use %d Hz instead.\n", dev_name(&spi->dev), |
87bf5ab8 SAS |
185 | hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1))); |
186 | if (pm > 33) | |
187 | pm = 33; | |
8b60d6c2 | 188 | } else { |
35faa55c | 189 | pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4); |
8b60d6c2 MH |
190 | } |
191 | if (pm) | |
192 | pm--; | |
87bf5ab8 SAS |
193 | if (pm < 2) |
194 | pm = 2; | |
8b60d6c2 MH |
195 | |
196 | cs->hw_mode |= CSMODE_PM(pm); | |
197 | ||
198 | fsl_espi_change_mode(spi); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t, | |
203 | unsigned int len) | |
204 | { | |
205 | u32 word; | |
206 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
207 | ||
208 | mspi->count = len; | |
209 | ||
210 | /* enable rx ints */ | |
211 | mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); | |
212 | ||
213 | /* transmit word */ | |
214 | word = mspi->get_tx(mspi); | |
215 | mpc8xxx_spi_write_reg(®_base->transmit, word); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) | |
221 | { | |
222 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); | |
223 | struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; | |
224 | unsigned int len = t->len; | |
8b60d6c2 MH |
225 | int ret; |
226 | ||
8b60d6c2 MH |
227 | mpc8xxx_spi->len = t->len; |
228 | len = roundup(len, 4) / 4; | |
229 | ||
230 | mpc8xxx_spi->tx = t->tx_buf; | |
231 | mpc8xxx_spi->rx = t->rx_buf; | |
232 | ||
16735d02 | 233 | reinit_completion(&mpc8xxx_spi->done); |
8b60d6c2 MH |
234 | |
235 | /* Set SPCOM[CS] and SPCOM[TRANLEN] field */ | |
5cfa1e4e | 236 | if (t->len > SPCOM_TRANLEN_MAX) { |
8b60d6c2 MH |
237 | dev_err(mpc8xxx_spi->dev, "Transaction length (%d)" |
238 | " beyond the SPCOM[TRANLEN] field\n", t->len); | |
239 | return -EINVAL; | |
240 | } | |
241 | mpc8xxx_spi_write_reg(®_base->command, | |
242 | (SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1))); | |
243 | ||
244 | ret = fsl_espi_cpu_bufs(mpc8xxx_spi, t, len); | |
245 | if (ret) | |
246 | return ret; | |
247 | ||
aa70e567 NH |
248 | /* Won't hang up forever, SPI bus sometimes got lost interrupts... */ |
249 | ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ); | |
250 | if (ret == 0) | |
251 | dev_err(mpc8xxx_spi->dev, | |
252 | "Transaction hanging up (left %d bytes)\n", | |
253 | mpc8xxx_spi->count); | |
8b60d6c2 MH |
254 | |
255 | /* disable rx ints */ | |
256 | mpc8xxx_spi_write_reg(®_base->mask, 0); | |
257 | ||
258 | return mpc8xxx_spi->count; | |
259 | } | |
260 | ||
0dd2c96f | 261 | static inline void fsl_espi_addr2cmd(unsigned int addr, u8 *cmd) |
8b60d6c2 | 262 | { |
0dd2c96f | 263 | if (cmd) { |
8b60d6c2 MH |
264 | cmd[1] = (u8)(addr >> 16); |
265 | cmd[2] = (u8)(addr >> 8); | |
266 | cmd[3] = (u8)(addr >> 0); | |
267 | } | |
268 | } | |
269 | ||
0dd2c96f | 270 | static inline unsigned int fsl_espi_cmd2addr(u8 *cmd) |
8b60d6c2 | 271 | { |
0dd2c96f | 272 | if (cmd) |
8b60d6c2 MH |
273 | return cmd[1] << 16 | cmd[2] << 8 | cmd[3] << 0; |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static void fsl_espi_do_trans(struct spi_message *m, | |
279 | struct fsl_espi_transfer *tr) | |
280 | { | |
281 | struct spi_device *spi = m->spi; | |
282 | struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); | |
283 | struct fsl_espi_transfer *espi_trans = tr; | |
284 | struct spi_message message; | |
285 | struct spi_transfer *t, *first, trans; | |
286 | int status = 0; | |
287 | ||
288 | spi_message_init(&message); | |
289 | memset(&trans, 0, sizeof(trans)); | |
290 | ||
291 | first = list_first_entry(&m->transfers, struct spi_transfer, | |
292 | transfer_list); | |
293 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
294 | if ((first->bits_per_word != t->bits_per_word) || | |
295 | (first->speed_hz != t->speed_hz)) { | |
296 | espi_trans->status = -EINVAL; | |
f6bd03a7 JN |
297 | dev_err(mspi->dev, |
298 | "bits_per_word/speed_hz should be same for the same SPI transfer\n"); | |
8b60d6c2 MH |
299 | return; |
300 | } | |
301 | ||
302 | trans.speed_hz = t->speed_hz; | |
303 | trans.bits_per_word = t->bits_per_word; | |
304 | trans.delay_usecs = max(first->delay_usecs, t->delay_usecs); | |
305 | } | |
306 | ||
307 | trans.len = espi_trans->len; | |
308 | trans.tx_buf = espi_trans->tx_buf; | |
309 | trans.rx_buf = espi_trans->rx_buf; | |
310 | spi_message_add_tail(&trans, &message); | |
311 | ||
312 | list_for_each_entry(t, &message.transfers, transfer_list) { | |
313 | if (t->bits_per_word || t->speed_hz) { | |
314 | status = -EINVAL; | |
315 | ||
316 | status = fsl_espi_setup_transfer(spi, t); | |
317 | if (status < 0) | |
318 | break; | |
319 | } | |
320 | ||
321 | if (t->len) | |
322 | status = fsl_espi_bufs(spi, t); | |
323 | ||
324 | if (status) { | |
325 | status = -EMSGSIZE; | |
326 | break; | |
327 | } | |
328 | ||
329 | if (t->delay_usecs) | |
330 | udelay(t->delay_usecs); | |
331 | } | |
332 | ||
333 | espi_trans->status = status; | |
334 | fsl_espi_setup_transfer(spi, NULL); | |
335 | } | |
336 | ||
337 | static void fsl_espi_cmd_trans(struct spi_message *m, | |
338 | struct fsl_espi_transfer *trans, u8 *rx_buff) | |
339 | { | |
340 | struct spi_transfer *t; | |
341 | u8 *local_buf; | |
342 | int i = 0; | |
343 | struct fsl_espi_transfer *espi_trans = trans; | |
344 | ||
345 | local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); | |
346 | if (!local_buf) { | |
347 | espi_trans->status = -ENOMEM; | |
348 | return; | |
349 | } | |
350 | ||
351 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
352 | if (t->tx_buf) { | |
353 | memcpy(local_buf + i, t->tx_buf, t->len); | |
354 | i += t->len; | |
355 | } | |
356 | } | |
357 | ||
358 | espi_trans->tx_buf = local_buf; | |
a2cb1be1 | 359 | espi_trans->rx_buf = local_buf; |
8b60d6c2 MH |
360 | fsl_espi_do_trans(m, espi_trans); |
361 | ||
362 | espi_trans->actual_length = espi_trans->len; | |
363 | kfree(local_buf); | |
364 | } | |
365 | ||
366 | static void fsl_espi_rw_trans(struct spi_message *m, | |
367 | struct fsl_espi_transfer *trans, u8 *rx_buff) | |
368 | { | |
369 | struct fsl_espi_transfer *espi_trans = trans; | |
2000058e | 370 | unsigned int total_len = espi_trans->len; |
8b60d6c2 MH |
371 | struct spi_transfer *t; |
372 | u8 *local_buf; | |
373 | u8 *rx_buf = rx_buff; | |
374 | unsigned int trans_len; | |
375 | unsigned int addr; | |
2000058e JR |
376 | unsigned int tx_only; |
377 | unsigned int rx_pos = 0; | |
378 | unsigned int pos; | |
379 | int i, loop; | |
8b60d6c2 MH |
380 | |
381 | local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); | |
382 | if (!local_buf) { | |
383 | espi_trans->status = -ENOMEM; | |
384 | return; | |
385 | } | |
386 | ||
2000058e JR |
387 | for (pos = 0, loop = 0; pos < total_len; pos += trans_len, loop++) { |
388 | trans_len = total_len - pos; | |
8b60d6c2 MH |
389 | |
390 | i = 0; | |
2000058e | 391 | tx_only = 0; |
8b60d6c2 MH |
392 | list_for_each_entry(t, &m->transfers, transfer_list) { |
393 | if (t->tx_buf) { | |
394 | memcpy(local_buf + i, t->tx_buf, t->len); | |
395 | i += t->len; | |
2000058e JR |
396 | if (!t->rx_buf) |
397 | tx_only += t->len; | |
8b60d6c2 MH |
398 | } |
399 | } | |
400 | ||
2000058e JR |
401 | /* Add additional TX bytes to compensate SPCOM_TRANLEN_MAX */ |
402 | if (loop > 0) | |
403 | trans_len += tx_only; | |
404 | ||
405 | if (trans_len > SPCOM_TRANLEN_MAX) | |
406 | trans_len = SPCOM_TRANLEN_MAX; | |
407 | ||
408 | /* Update device offset */ | |
0dd2c96f MH |
409 | if (pos > 0) { |
410 | addr = fsl_espi_cmd2addr(local_buf); | |
2000058e | 411 | addr += rx_pos; |
0dd2c96f MH |
412 | fsl_espi_addr2cmd(addr, local_buf); |
413 | } | |
8b60d6c2 | 414 | |
2000058e | 415 | espi_trans->len = trans_len; |
8b60d6c2 | 416 | espi_trans->tx_buf = local_buf; |
a2cb1be1 | 417 | espi_trans->rx_buf = local_buf; |
8b60d6c2 MH |
418 | fsl_espi_do_trans(m, espi_trans); |
419 | ||
2000058e JR |
420 | /* If there is at least one RX byte then copy it to rx_buf */ |
421 | if (tx_only < SPCOM_TRANLEN_MAX) | |
422 | memcpy(rx_buf + rx_pos, espi_trans->rx_buf + tx_only, | |
423 | trans_len - tx_only); | |
424 | ||
425 | rx_pos += trans_len - tx_only; | |
8b60d6c2 MH |
426 | |
427 | if (loop > 0) | |
2000058e | 428 | espi_trans->actual_length += espi_trans->len - tx_only; |
8b60d6c2 MH |
429 | else |
430 | espi_trans->actual_length += espi_trans->len; | |
431 | } | |
432 | ||
433 | kfree(local_buf); | |
434 | } | |
435 | ||
c592becb HK |
436 | static int fsl_espi_do_one_msg(struct spi_master *master, |
437 | struct spi_message *m) | |
8b60d6c2 MH |
438 | { |
439 | struct spi_transfer *t; | |
440 | u8 *rx_buf = NULL; | |
441 | unsigned int n_tx = 0; | |
442 | unsigned int n_rx = 0; | |
2000058e | 443 | unsigned int xfer_len = 0; |
8b60d6c2 MH |
444 | struct fsl_espi_transfer espi_trans; |
445 | ||
446 | list_for_each_entry(t, &m->transfers, transfer_list) { | |
447 | if (t->tx_buf) | |
448 | n_tx += t->len; | |
449 | if (t->rx_buf) { | |
450 | n_rx += t->len; | |
451 | rx_buf = t->rx_buf; | |
452 | } | |
2000058e JR |
453 | if ((t->tx_buf) || (t->rx_buf)) |
454 | xfer_len += t->len; | |
8b60d6c2 MH |
455 | } |
456 | ||
457 | espi_trans.n_tx = n_tx; | |
458 | espi_trans.n_rx = n_rx; | |
2000058e | 459 | espi_trans.len = xfer_len; |
8b60d6c2 MH |
460 | espi_trans.actual_length = 0; |
461 | espi_trans.status = 0; | |
462 | ||
463 | if (!rx_buf) | |
464 | fsl_espi_cmd_trans(m, &espi_trans, NULL); | |
465 | else | |
466 | fsl_espi_rw_trans(m, &espi_trans, rx_buf); | |
467 | ||
468 | m->actual_length = espi_trans.actual_length; | |
469 | m->status = espi_trans.status; | |
c592becb HK |
470 | spi_finalize_current_message(master); |
471 | return 0; | |
8b60d6c2 MH |
472 | } |
473 | ||
474 | static int fsl_espi_setup(struct spi_device *spi) | |
475 | { | |
476 | struct mpc8xxx_spi *mpc8xxx_spi; | |
477 | struct fsl_espi_reg *reg_base; | |
478 | int retval; | |
479 | u32 hw_mode; | |
480 | u32 loop_mode; | |
d9f26748 | 481 | struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); |
8b60d6c2 MH |
482 | |
483 | if (!spi->max_speed_hz) | |
484 | return -EINVAL; | |
485 | ||
486 | if (!cs) { | |
d9f26748 | 487 | cs = kzalloc(sizeof(*cs), GFP_KERNEL); |
8b60d6c2 MH |
488 | if (!cs) |
489 | return -ENOMEM; | |
d9f26748 | 490 | spi_set_ctldata(spi, cs); |
8b60d6c2 MH |
491 | } |
492 | ||
493 | mpc8xxx_spi = spi_master_get_devdata(spi->master); | |
494 | reg_base = mpc8xxx_spi->reg_base; | |
495 | ||
e9abb4db HK |
496 | pm_runtime_get_sync(mpc8xxx_spi->dev); |
497 | ||
25985edc | 498 | hw_mode = cs->hw_mode; /* Save original settings */ |
8b60d6c2 MH |
499 | cs->hw_mode = mpc8xxx_spi_read_reg( |
500 | ®_base->csmode[spi->chip_select]); | |
501 | /* mask out bits we are going to set */ | |
502 | cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH | |
503 | | CSMODE_REV); | |
504 | ||
505 | if (spi->mode & SPI_CPHA) | |
506 | cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK; | |
507 | if (spi->mode & SPI_CPOL) | |
508 | cs->hw_mode |= CSMODE_CI_INACTIVEHIGH; | |
509 | if (!(spi->mode & SPI_LSB_FIRST)) | |
510 | cs->hw_mode |= CSMODE_REV; | |
511 | ||
512 | /* Handle the loop mode */ | |
513 | loop_mode = mpc8xxx_spi_read_reg(®_base->mode); | |
514 | loop_mode &= ~SPMODE_LOOP; | |
515 | if (spi->mode & SPI_LOOP) | |
516 | loop_mode |= SPMODE_LOOP; | |
517 | mpc8xxx_spi_write_reg(®_base->mode, loop_mode); | |
518 | ||
519 | retval = fsl_espi_setup_transfer(spi, NULL); | |
e9abb4db HK |
520 | |
521 | pm_runtime_mark_last_busy(mpc8xxx_spi->dev); | |
522 | pm_runtime_put_autosuspend(mpc8xxx_spi->dev); | |
523 | ||
8b60d6c2 MH |
524 | if (retval < 0) { |
525 | cs->hw_mode = hw_mode; /* Restore settings */ | |
526 | return retval; | |
527 | } | |
528 | return 0; | |
529 | } | |
530 | ||
d9f26748 AL |
531 | static void fsl_espi_cleanup(struct spi_device *spi) |
532 | { | |
533 | struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); | |
534 | ||
535 | kfree(cs); | |
536 | spi_set_ctldata(spi, NULL); | |
537 | } | |
538 | ||
8b60d6c2 MH |
539 | void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) |
540 | { | |
541 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
542 | ||
543 | /* We need handle RX first */ | |
544 | if (events & SPIE_NE) { | |
e6289d63 MH |
545 | u32 rx_data, tmp; |
546 | u8 rx_data_8; | |
6319a680 | 547 | int rx_nr_bytes = 4; |
a12ddd60 | 548 | int ret; |
8b60d6c2 MH |
549 | |
550 | /* Spin until RX is done */ | |
a12ddd60 NH |
551 | if (SPIE_RXCNT(events) < min(4, mspi->len)) { |
552 | ret = spin_event_timeout( | |
553 | !(SPIE_RXCNT(events = | |
554 | mpc8xxx_spi_read_reg(®_base->event)) < | |
555 | min(4, mspi->len)), | |
556 | 10000, 0); /* 10 msec */ | |
557 | if (!ret) | |
558 | dev_err(mspi->dev, | |
559 | "tired waiting for SPIE_RXCNT\n"); | |
8b60d6c2 | 560 | } |
8b60d6c2 | 561 | |
e6289d63 MH |
562 | if (mspi->len >= 4) { |
563 | rx_data = mpc8xxx_spi_read_reg(®_base->receive); | |
6319a680 NH |
564 | } else if (mspi->len <= 0) { |
565 | dev_err(mspi->dev, | |
566 | "unexpected RX(SPIE_NE) interrupt occurred,\n" | |
567 | "(local rxlen %d bytes, reg rxlen %d bytes)\n", | |
568 | min(4, mspi->len), SPIE_RXCNT(events)); | |
569 | rx_nr_bytes = 0; | |
e6289d63 | 570 | } else { |
6319a680 | 571 | rx_nr_bytes = mspi->len; |
e6289d63 MH |
572 | tmp = mspi->len; |
573 | rx_data = 0; | |
574 | while (tmp--) { | |
575 | rx_data_8 = in_8((u8 *)®_base->receive); | |
576 | rx_data |= (rx_data_8 << (tmp * 8)); | |
577 | } | |
578 | ||
579 | rx_data <<= (4 - mspi->len) * 8; | |
580 | } | |
581 | ||
6319a680 | 582 | mspi->len -= rx_nr_bytes; |
8b60d6c2 MH |
583 | |
584 | if (mspi->rx) | |
585 | mspi->get_rx(rx_data, mspi); | |
586 | } | |
587 | ||
588 | if (!(events & SPIE_NF)) { | |
589 | int ret; | |
590 | ||
591 | /* spin until TX is done */ | |
592 | ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg( | |
7a0a1759 | 593 | ®_base->event)) & SPIE_NF), 1000, 0); |
8b60d6c2 MH |
594 | if (!ret) { |
595 | dev_err(mspi->dev, "tired waiting for SPIE_NF\n"); | |
7a0a1759 JW |
596 | |
597 | /* Clear the SPIE bits */ | |
598 | mpc8xxx_spi_write_reg(®_base->event, events); | |
599 | complete(&mspi->done); | |
8b60d6c2 MH |
600 | return; |
601 | } | |
602 | } | |
603 | ||
604 | /* Clear the events */ | |
605 | mpc8xxx_spi_write_reg(®_base->event, events); | |
606 | ||
607 | mspi->count -= 1; | |
608 | if (mspi->count) { | |
609 | u32 word = mspi->get_tx(mspi); | |
610 | ||
611 | mpc8xxx_spi_write_reg(®_base->transmit, word); | |
612 | } else { | |
613 | complete(&mspi->done); | |
614 | } | |
615 | } | |
616 | ||
617 | static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) | |
618 | { | |
619 | struct mpc8xxx_spi *mspi = context_data; | |
620 | struct fsl_espi_reg *reg_base = mspi->reg_base; | |
621 | irqreturn_t ret = IRQ_NONE; | |
622 | u32 events; | |
623 | ||
624 | /* Get interrupt events(tx/rx) */ | |
625 | events = mpc8xxx_spi_read_reg(®_base->event); | |
626 | if (events) | |
627 | ret = IRQ_HANDLED; | |
628 | ||
629 | dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events); | |
630 | ||
631 | fsl_espi_cpu_irq(mspi, events); | |
632 | ||
633 | return ret; | |
634 | } | |
635 | ||
e9abb4db HK |
636 | #ifdef CONFIG_PM |
637 | static int fsl_espi_runtime_suspend(struct device *dev) | |
75506d0e | 638 | { |
e9abb4db HK |
639 | struct spi_master *master = dev_get_drvdata(dev); |
640 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); | |
641 | struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; | |
75506d0e HK |
642 | u32 regval; |
643 | ||
75506d0e HK |
644 | regval = mpc8xxx_spi_read_reg(®_base->mode); |
645 | regval &= ~SPMODE_ENABLE; | |
646 | mpc8xxx_spi_write_reg(®_base->mode, regval); | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
e9abb4db | 651 | static int fsl_espi_runtime_resume(struct device *dev) |
75506d0e | 652 | { |
e9abb4db HK |
653 | struct spi_master *master = dev_get_drvdata(dev); |
654 | struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); | |
655 | struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; | |
75506d0e HK |
656 | u32 regval; |
657 | ||
75506d0e HK |
658 | regval = mpc8xxx_spi_read_reg(®_base->mode); |
659 | regval |= SPMODE_ENABLE; | |
660 | mpc8xxx_spi_write_reg(®_base->mode, regval); | |
661 | ||
662 | return 0; | |
663 | } | |
e9abb4db | 664 | #endif |
75506d0e | 665 | |
b541eef1 MS |
666 | static size_t fsl_espi_max_transfer_size(struct spi_device *spi) |
667 | { | |
668 | return SPCOM_TRANLEN_MAX; | |
669 | } | |
670 | ||
fd4a319b | 671 | static struct spi_master * fsl_espi_probe(struct device *dev, |
8b60d6c2 MH |
672 | struct resource *mem, unsigned int irq) |
673 | { | |
8074cf06 | 674 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
8b60d6c2 MH |
675 | struct spi_master *master; |
676 | struct mpc8xxx_spi *mpc8xxx_spi; | |
677 | struct fsl_espi_reg *reg_base; | |
d0fb47a5 JW |
678 | struct device_node *nc; |
679 | const __be32 *prop; | |
680 | u32 regval, csmode; | |
681 | int i, len, ret = 0; | |
8b60d6c2 MH |
682 | |
683 | master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); | |
684 | if (!master) { | |
685 | ret = -ENOMEM; | |
686 | goto err; | |
687 | } | |
688 | ||
689 | dev_set_drvdata(dev, master); | |
690 | ||
c592becb | 691 | mpc8xxx_spi_probe(dev, mem, irq); |
8b60d6c2 | 692 | |
24778be2 | 693 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16); |
8b60d6c2 | 694 | master->setup = fsl_espi_setup; |
d9f26748 | 695 | master->cleanup = fsl_espi_cleanup; |
c592becb | 696 | master->transfer_one_message = fsl_espi_do_one_msg; |
e9abb4db | 697 | master->auto_runtime_pm = true; |
b541eef1 | 698 | master->max_transfer_size = fsl_espi_max_transfer_size; |
8b60d6c2 MH |
699 | |
700 | mpc8xxx_spi = spi_master_get_devdata(master); | |
8b60d6c2 | 701 | |
4178b6b1 | 702 | mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem); |
37c5db79 AL |
703 | if (IS_ERR(mpc8xxx_spi->reg_base)) { |
704 | ret = PTR_ERR(mpc8xxx_spi->reg_base); | |
8b60d6c2 MH |
705 | goto err_probe; |
706 | } | |
707 | ||
708 | reg_base = mpc8xxx_spi->reg_base; | |
709 | ||
710 | /* Register for SPI Interrupt */ | |
4178b6b1 | 711 | ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_espi_irq, |
8b60d6c2 MH |
712 | 0, "fsl_espi", mpc8xxx_spi); |
713 | if (ret) | |
4178b6b1 | 714 | goto err_probe; |
8b60d6c2 MH |
715 | |
716 | if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { | |
717 | mpc8xxx_spi->rx_shift = 16; | |
718 | mpc8xxx_spi->tx_shift = 24; | |
719 | } | |
720 | ||
721 | /* SPI controller initializations */ | |
722 | mpc8xxx_spi_write_reg(®_base->mode, 0); | |
723 | mpc8xxx_spi_write_reg(®_base->mask, 0); | |
724 | mpc8xxx_spi_write_reg(®_base->command, 0); | |
725 | mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); | |
726 | ||
727 | /* Init eSPI CS mode register */ | |
d0fb47a5 JW |
728 | for_each_available_child_of_node(master->dev.of_node, nc) { |
729 | /* get chip select */ | |
730 | prop = of_get_property(nc, "reg", &len); | |
731 | if (!prop || len < sizeof(*prop)) | |
732 | continue; | |
733 | i = be32_to_cpup(prop); | |
734 | if (i < 0 || i >= pdata->max_chipselect) | |
735 | continue; | |
736 | ||
737 | csmode = CSMODE_INIT_VAL; | |
738 | /* check if CSBEF is set in device tree */ | |
739 | prop = of_get_property(nc, "fsl,csbef", &len); | |
740 | if (prop && len >= sizeof(*prop)) { | |
741 | csmode &= ~(CSMODE_BEF(0xf)); | |
742 | csmode |= CSMODE_BEF(be32_to_cpup(prop)); | |
743 | } | |
744 | /* check if CSAFT is set in device tree */ | |
745 | prop = of_get_property(nc, "fsl,csaft", &len); | |
746 | if (prop && len >= sizeof(*prop)) { | |
747 | csmode &= ~(CSMODE_AFT(0xf)); | |
748 | csmode |= CSMODE_AFT(be32_to_cpup(prop)); | |
749 | } | |
750 | mpc8xxx_spi_write_reg(®_base->csmode[i], csmode); | |
751 | ||
752 | dev_info(dev, "cs=%d, init_csmode=0x%x\n", i, csmode); | |
753 | } | |
8b60d6c2 MH |
754 | |
755 | /* Enable SPI interface */ | |
756 | regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; | |
757 | ||
758 | mpc8xxx_spi_write_reg(®_base->mode, regval); | |
759 | ||
e9abb4db HK |
760 | pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_TIMEOUT); |
761 | pm_runtime_use_autosuspend(dev); | |
762 | pm_runtime_set_active(dev); | |
763 | pm_runtime_enable(dev); | |
764 | pm_runtime_get_sync(dev); | |
765 | ||
4178b6b1 | 766 | ret = devm_spi_register_master(dev, master); |
8b60d6c2 | 767 | if (ret < 0) |
e9abb4db | 768 | goto err_pm; |
8b60d6c2 MH |
769 | |
770 | dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq); | |
771 | ||
e9abb4db HK |
772 | pm_runtime_mark_last_busy(dev); |
773 | pm_runtime_put_autosuspend(dev); | |
774 | ||
8b60d6c2 MH |
775 | return master; |
776 | ||
e9abb4db HK |
777 | err_pm: |
778 | pm_runtime_put_noidle(dev); | |
779 | pm_runtime_disable(dev); | |
780 | pm_runtime_set_suspended(dev); | |
8b60d6c2 MH |
781 | err_probe: |
782 | spi_master_put(master); | |
783 | err: | |
784 | return ERR_PTR(ret); | |
785 | } | |
786 | ||
787 | static int of_fsl_espi_get_chipselects(struct device *dev) | |
788 | { | |
789 | struct device_node *np = dev->of_node; | |
8074cf06 | 790 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); |
8b60d6c2 MH |
791 | const u32 *prop; |
792 | int len; | |
793 | ||
794 | prop = of_get_property(np, "fsl,espi-num-chipselects", &len); | |
795 | if (!prop || len < sizeof(*prop)) { | |
796 | dev_err(dev, "No 'fsl,espi-num-chipselects' property\n"); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | pdata->max_chipselect = *prop; | |
801 | pdata->cs_control = NULL; | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
fd4a319b | 806 | static int of_fsl_espi_probe(struct platform_device *ofdev) |
8b60d6c2 MH |
807 | { |
808 | struct device *dev = &ofdev->dev; | |
809 | struct device_node *np = ofdev->dev.of_node; | |
810 | struct spi_master *master; | |
811 | struct resource mem; | |
f7578496 | 812 | unsigned int irq; |
8b60d6c2 MH |
813 | int ret = -ENOMEM; |
814 | ||
18d306d1 | 815 | ret = of_mpc8xxx_spi_probe(ofdev); |
8b60d6c2 MH |
816 | if (ret) |
817 | return ret; | |
818 | ||
819 | ret = of_fsl_espi_get_chipselects(dev); | |
820 | if (ret) | |
821 | goto err; | |
822 | ||
823 | ret = of_address_to_resource(np, 0, &mem); | |
824 | if (ret) | |
825 | goto err; | |
826 | ||
f7578496 | 827 | irq = irq_of_parse_and_map(np, 0); |
7227cd18 | 828 | if (!irq) { |
8b60d6c2 MH |
829 | ret = -EINVAL; |
830 | goto err; | |
831 | } | |
832 | ||
f7578496 | 833 | master = fsl_espi_probe(dev, &mem, irq); |
8b60d6c2 MH |
834 | if (IS_ERR(master)) { |
835 | ret = PTR_ERR(master); | |
836 | goto err; | |
837 | } | |
838 | ||
839 | return 0; | |
840 | ||
841 | err: | |
842 | return ret; | |
843 | } | |
844 | ||
e9abb4db HK |
845 | static int of_fsl_espi_remove(struct platform_device *dev) |
846 | { | |
847 | pm_runtime_disable(&dev->dev); | |
848 | ||
849 | return 0; | |
850 | } | |
851 | ||
714bb654 HZ |
852 | #ifdef CONFIG_PM_SLEEP |
853 | static int of_fsl_espi_suspend(struct device *dev) | |
854 | { | |
855 | struct spi_master *master = dev_get_drvdata(dev); | |
714bb654 HZ |
856 | int ret; |
857 | ||
714bb654 HZ |
858 | ret = spi_master_suspend(master); |
859 | if (ret) { | |
860 | dev_warn(dev, "cannot suspend master\n"); | |
861 | return ret; | |
862 | } | |
863 | ||
e9abb4db HK |
864 | ret = pm_runtime_force_suspend(dev); |
865 | if (ret < 0) | |
866 | return ret; | |
867 | ||
868 | return 0; | |
714bb654 HZ |
869 | } |
870 | ||
871 | static int of_fsl_espi_resume(struct device *dev) | |
872 | { | |
873 | struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); | |
874 | struct spi_master *master = dev_get_drvdata(dev); | |
875 | struct mpc8xxx_spi *mpc8xxx_spi; | |
876 | struct fsl_espi_reg *reg_base; | |
877 | u32 regval; | |
e9abb4db | 878 | int i, ret; |
714bb654 HZ |
879 | |
880 | mpc8xxx_spi = spi_master_get_devdata(master); | |
881 | reg_base = mpc8xxx_spi->reg_base; | |
882 | ||
883 | /* SPI controller initializations */ | |
884 | mpc8xxx_spi_write_reg(®_base->mode, 0); | |
885 | mpc8xxx_spi_write_reg(®_base->mask, 0); | |
886 | mpc8xxx_spi_write_reg(®_base->command, 0); | |
887 | mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); | |
888 | ||
889 | /* Init eSPI CS mode register */ | |
890 | for (i = 0; i < pdata->max_chipselect; i++) | |
891 | mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL); | |
892 | ||
893 | /* Enable SPI interface */ | |
894 | regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; | |
895 | ||
896 | mpc8xxx_spi_write_reg(®_base->mode, regval); | |
897 | ||
e9abb4db HK |
898 | ret = pm_runtime_force_resume(dev); |
899 | if (ret < 0) | |
900 | return ret; | |
901 | ||
714bb654 HZ |
902 | return spi_master_resume(master); |
903 | } | |
904 | #endif /* CONFIG_PM_SLEEP */ | |
905 | ||
906 | static const struct dev_pm_ops espi_pm = { | |
e9abb4db HK |
907 | SET_RUNTIME_PM_OPS(fsl_espi_runtime_suspend, |
908 | fsl_espi_runtime_resume, NULL) | |
714bb654 HZ |
909 | SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume) |
910 | }; | |
911 | ||
8b60d6c2 MH |
912 | static const struct of_device_id of_fsl_espi_match[] = { |
913 | { .compatible = "fsl,mpc8536-espi" }, | |
914 | {} | |
915 | }; | |
916 | MODULE_DEVICE_TABLE(of, of_fsl_espi_match); | |
917 | ||
18d306d1 | 918 | static struct platform_driver fsl_espi_driver = { |
8b60d6c2 MH |
919 | .driver = { |
920 | .name = "fsl_espi", | |
8b60d6c2 | 921 | .of_match_table = of_fsl_espi_match, |
714bb654 | 922 | .pm = &espi_pm, |
8b60d6c2 MH |
923 | }, |
924 | .probe = of_fsl_espi_probe, | |
e9abb4db | 925 | .remove = of_fsl_espi_remove, |
8b60d6c2 | 926 | }; |
940ab889 | 927 | module_platform_driver(fsl_espi_driver); |
8b60d6c2 MH |
928 | |
929 | MODULE_AUTHOR("Mingkai Hu"); | |
930 | MODULE_DESCRIPTION("Enhanced Freescale SPI Driver"); | |
931 | MODULE_LICENSE("GPL"); |