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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
273feafe MH |
2 | /* |
3 | * eSPI controller driver. | |
4 | * | |
5 | * Copyright 2010-2011 Freescale Semiconductor, Inc. | |
6 | * Author: Mingkai Hu (Mingkai.hu@freescale.com) | |
273feafe MH |
7 | */ |
8 | ||
9 | #include <common.h> | |
10 | ||
11 | #include <malloc.h> | |
12 | #include <spi.h> | |
13 | #include <asm/immap_85xx.h> | |
14 | ||
15 | struct fsl_spi_slave { | |
16 | struct spi_slave slave; | |
afb90706 | 17 | ccsr_espi_t *espi; |
273feafe MH |
18 | unsigned int div16; |
19 | unsigned int pm; | |
afb90706 | 20 | int tx_timeout; |
273feafe MH |
21 | unsigned int mode; |
22 | size_t cmd_len; | |
23 | u8 cmd_buf[16]; | |
24 | size_t data_len; | |
25 | unsigned int max_transfer_length; | |
26 | }; | |
27 | ||
28 | #define to_fsl_spi_slave(s) container_of(s, struct fsl_spi_slave, slave) | |
afb90706 | 29 | #define US_PER_SECOND 1000000UL |
273feafe MH |
30 | |
31 | #define ESPI_MAX_CS_NUM 4 | |
afb90706 | 32 | #define ESPI_FIFO_WIDTH_BIT 32 |
273feafe | 33 | |
29e6abd9 JT |
34 | #define ESPI_EV_RNE BIT(9) |
35 | #define ESPI_EV_TNF BIT(8) | |
36 | #define ESPI_EV_DON BIT(14) | |
37 | #define ESPI_EV_TXE BIT(15) | |
afb90706 HZ |
38 | #define ESPI_EV_RFCNT_SHIFT 24 |
39 | #define ESPI_EV_RFCNT_MASK (0x3f << ESPI_EV_RFCNT_SHIFT) | |
273feafe | 40 | |
29e6abd9 | 41 | #define ESPI_MODE_EN BIT(31) /* Enable interface */ |
273feafe MH |
42 | #define ESPI_MODE_TXTHR(x) ((x) << 8) /* Tx FIFO threshold */ |
43 | #define ESPI_MODE_RXTHR(x) ((x) << 0) /* Rx FIFO threshold */ | |
44 | ||
45 | #define ESPI_COM_CS(x) ((x) << 30) | |
46 | #define ESPI_COM_TRANLEN(x) ((x) << 0) | |
47 | ||
29e6abd9 JT |
48 | #define ESPI_CSMODE_CI_INACTIVEHIGH BIT(31) |
49 | #define ESPI_CSMODE_CP_BEGIN_EDGCLK BIT(30) | |
50 | #define ESPI_CSMODE_REV_MSB_FIRST BIT(29) | |
51 | #define ESPI_CSMODE_DIV16 BIT(28) | |
273feafe | 52 | #define ESPI_CSMODE_PM(x) ((x) << 24) |
29e6abd9 | 53 | #define ESPI_CSMODE_POL_ASSERTED_LOW BIT(20) |
273feafe MH |
54 | #define ESPI_CSMODE_LEN(x) ((x) << 16) |
55 | #define ESPI_CSMODE_CSBEF(x) ((x) << 12) | |
56 | #define ESPI_CSMODE_CSAFT(x) ((x) << 8) | |
57 | #define ESPI_CSMODE_CSCG(x) ((x) << 3) | |
58 | ||
59 | #define ESPI_CSMODE_INIT_VAL (ESPI_CSMODE_POL_ASSERTED_LOW | \ | |
60 | ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \ | |
61 | ESPI_CSMODE_CSCG(1)) | |
62 | ||
63 | #define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0 | |
64 | ||
65 | struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, | |
66 | unsigned int max_hz, unsigned int mode) | |
67 | { | |
68 | struct fsl_spi_slave *fsl; | |
69 | sys_info_t sysinfo; | |
70 | unsigned long spibrg = 0; | |
afb90706 | 71 | unsigned long spi_freq = 0; |
273feafe MH |
72 | unsigned char pm = 0; |
73 | ||
74 | if (!spi_cs_is_valid(bus, cs)) | |
75 | return NULL; | |
76 | ||
d3504fee | 77 | fsl = spi_alloc_slave(struct fsl_spi_slave, bus, cs); |
273feafe MH |
78 | if (!fsl) |
79 | return NULL; | |
80 | ||
afb90706 | 81 | fsl->espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); |
273feafe MH |
82 | fsl->mode = mode; |
83 | fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN; | |
84 | ||
85 | /* Set eSPI BRG clock source */ | |
86 | get_sys_info(&sysinfo); | |
997399fa | 87 | spibrg = sysinfo.freq_systembus / 2; |
273feafe MH |
88 | fsl->div16 = 0; |
89 | if ((spibrg / max_hz) > 32) { | |
90 | fsl->div16 = ESPI_CSMODE_DIV16; | |
91 | pm = spibrg / (max_hz * 16 * 2); | |
92 | if (pm > 16) { | |
93 | pm = 16; | |
5cc08a17 MV |
94 | debug("Requested speed is too low: %d Hz, %ld Hz " |
95 | "is used.\n", max_hz, spibrg / (32 * 16)); | |
273feafe MH |
96 | } |
97 | } else | |
98 | pm = spibrg / (max_hz * 2); | |
99 | if (pm) | |
100 | pm--; | |
101 | fsl->pm = pm; | |
102 | ||
afb90706 HZ |
103 | if (fsl->div16) |
104 | spi_freq = spibrg / ((pm + 1) * 2 * 16); | |
105 | else | |
106 | spi_freq = spibrg / ((pm + 1) * 2); | |
107 | ||
108 | /* set tx_timeout to 10 times of one espi FIFO entry go out */ | |
109 | fsl->tx_timeout = DIV_ROUND_UP((US_PER_SECOND * ESPI_FIFO_WIDTH_BIT | |
110 | * 10), spi_freq); | |
111 | ||
273feafe MH |
112 | return &fsl->slave; |
113 | } | |
114 | ||
115 | void spi_free_slave(struct spi_slave *slave) | |
116 | { | |
117 | struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); | |
118 | free(fsl); | |
119 | } | |
120 | ||
273feafe MH |
121 | int spi_claim_bus(struct spi_slave *slave) |
122 | { | |
123 | struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); | |
afb90706 | 124 | ccsr_espi_t *espi = fsl->espi; |
273feafe MH |
125 | unsigned char pm = fsl->pm; |
126 | unsigned int cs = slave->cs; | |
127 | unsigned int mode = fsl->mode; | |
128 | unsigned int div16 = fsl->div16; | |
129 | int i; | |
130 | ||
131 | debug("%s: bus:%i cs:%i\n", __func__, slave->bus, cs); | |
132 | ||
133 | /* Enable eSPI interface */ | |
134 | out_be32(&espi->mode, ESPI_MODE_RXTHR(3) | |
135 | | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN); | |
136 | ||
137 | out_be32(&espi->event, 0xffffffff); /* Clear all eSPI events */ | |
138 | out_be32(&espi->mask, 0x00000000); /* Mask all eSPI interrupts */ | |
139 | ||
140 | /* Init CS mode interface */ | |
141 | for (i = 0; i < ESPI_MAX_CS_NUM; i++) | |
142 | out_be32(&espi->csmode[i], ESPI_CSMODE_INIT_VAL); | |
143 | ||
144 | out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) & | |
145 | ~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16 | |
146 | | ESPI_CSMODE_CI_INACTIVEHIGH | ESPI_CSMODE_CP_BEGIN_EDGCLK | |
147 | | ESPI_CSMODE_REV_MSB_FIRST | ESPI_CSMODE_LEN(0xF))); | |
148 | ||
149 | /* Set eSPI BRG clock source */ | |
150 | out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) | |
151 | | ESPI_CSMODE_PM(pm) | div16); | |
152 | ||
153 | /* Set eSPI mode */ | |
154 | if (mode & SPI_CPHA) | |
155 | out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) | |
156 | | ESPI_CSMODE_CP_BEGIN_EDGCLK); | |
157 | if (mode & SPI_CPOL) | |
158 | out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) | |
159 | | ESPI_CSMODE_CI_INACTIVEHIGH); | |
160 | ||
161 | /* Character bit order: msb first */ | |
162 | out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) | |
163 | | ESPI_CSMODE_REV_MSB_FIRST); | |
164 | ||
165 | /* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */ | |
166 | out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) | |
167 | | ESPI_CSMODE_LEN(7)); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | void spi_release_bus(struct spi_slave *slave) | |
173 | { | |
174 | ||
175 | } | |
176 | ||
afb90706 HZ |
177 | static void fsl_espi_tx(struct fsl_spi_slave *fsl, const void *dout) |
178 | { | |
179 | ccsr_espi_t *espi = fsl->espi; | |
180 | unsigned int tmpdout, event; | |
181 | int tmp_tx_timeout; | |
182 | ||
183 | if (dout) | |
184 | tmpdout = *(u32 *)dout; | |
185 | else | |
186 | tmpdout = 0; | |
187 | ||
188 | out_be32(&espi->tx, tmpdout); | |
189 | out_be32(&espi->event, ESPI_EV_TNF); | |
190 | debug("***spi_xfer:...%08x written\n", tmpdout); | |
191 | ||
192 | tmp_tx_timeout = fsl->tx_timeout; | |
193 | /* Wait for eSPI transmit to go out */ | |
194 | while (tmp_tx_timeout--) { | |
195 | event = in_be32(&espi->event); | |
196 | if (event & ESPI_EV_DON || event & ESPI_EV_TXE) { | |
197 | out_be32(&espi->event, ESPI_EV_TXE); | |
198 | break; | |
199 | } | |
200 | udelay(1); | |
201 | } | |
202 | ||
203 | if (tmp_tx_timeout < 0) | |
204 | debug("***spi_xfer:...Tx timeout! event = %08x\n", event); | |
205 | } | |
206 | ||
207 | static int fsl_espi_rx(struct fsl_spi_slave *fsl, void *din, unsigned int bytes) | |
208 | { | |
209 | ccsr_espi_t *espi = fsl->espi; | |
210 | unsigned int tmpdin, rx_times; | |
211 | unsigned char *buf, *p_cursor; | |
212 | ||
213 | if (bytes <= 0) | |
214 | return 0; | |
215 | ||
216 | rx_times = DIV_ROUND_UP(bytes, 4); | |
217 | buf = (unsigned char *)malloc(4 * rx_times); | |
218 | if (!buf) { | |
219 | debug("SF: Failed to malloc memory.\n"); | |
220 | return -1; | |
221 | } | |
222 | p_cursor = buf; | |
223 | while (rx_times--) { | |
224 | tmpdin = in_be32(&espi->rx); | |
225 | debug("***spi_xfer:...%08x readed\n", tmpdin); | |
226 | *(u32 *)p_cursor = tmpdin; | |
227 | p_cursor += 4; | |
228 | } | |
229 | ||
230 | if (din) | |
231 | memcpy(din, buf, bytes); | |
232 | ||
233 | free(buf); | |
234 | out_be32(&espi->event, ESPI_EV_RNE); | |
235 | ||
236 | return bytes; | |
237 | } | |
238 | ||
273feafe MH |
239 | int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *data_out, |
240 | void *data_in, unsigned long flags) | |
241 | { | |
242 | struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); | |
afb90706 HZ |
243 | ccsr_espi_t *espi = fsl->espi; |
244 | unsigned int event, rx_bytes; | |
273feafe MH |
245 | const void *dout = NULL; |
246 | void *din = NULL; | |
247 | int len = 0; | |
248 | int num_blks, num_chunks, max_tran_len, tran_len; | |
249 | int num_bytes; | |
273feafe MH |
250 | unsigned char *buffer = NULL; |
251 | size_t buf_len; | |
252 | u8 *cmd_buf = fsl->cmd_buf; | |
253 | size_t cmd_len = fsl->cmd_len; | |
254 | size_t data_len = bitlen / 8; | |
255 | size_t rx_offset = 0; | |
afb90706 | 256 | int rf_cnt; |
273feafe MH |
257 | |
258 | max_tran_len = fsl->max_transfer_length; | |
259 | switch (flags) { | |
260 | case SPI_XFER_BEGIN: | |
261 | cmd_len = fsl->cmd_len = data_len; | |
262 | memcpy(cmd_buf, data_out, cmd_len); | |
263 | return 0; | |
264 | case 0: | |
265 | case SPI_XFER_END: | |
266 | if (bitlen == 0) { | |
267 | spi_cs_deactivate(slave); | |
268 | return 0; | |
269 | } | |
b4141195 | 270 | buf_len = 2 * cmd_len + min(data_len, (size_t)max_tran_len); |
273feafe MH |
271 | len = cmd_len + data_len; |
272 | rx_offset = cmd_len; | |
273 | buffer = (unsigned char *)malloc(buf_len); | |
274 | if (!buffer) { | |
275 | debug("SF: Failed to malloc memory.\n"); | |
276 | return 1; | |
277 | } | |
278 | memcpy(buffer, cmd_buf, cmd_len); | |
9905757e SX |
279 | if (data_in == NULL) |
280 | memcpy(buffer + cmd_len, data_out, data_len); | |
273feafe MH |
281 | break; |
282 | case SPI_XFER_BEGIN | SPI_XFER_END: | |
283 | len = data_len; | |
284 | buffer = (unsigned char *)malloc(len * 2); | |
285 | if (!buffer) { | |
286 | debug("SF: Failed to malloc memory.\n"); | |
287 | return 1; | |
288 | } | |
289 | memcpy(buffer, data_out, len); | |
290 | rx_offset = len; | |
291 | cmd_len = 0; | |
292 | break; | |
293 | } | |
294 | ||
afb90706 HZ |
295 | debug("spi_xfer: data_out %08X(%p) data_in %08X(%p) len %u\n", |
296 | *(uint *)data_out, data_out, *(uint *)data_in, data_in, len); | |
273feafe | 297 | |
a444aa7a | 298 | num_chunks = DIV_ROUND_UP(data_len, max_tran_len); |
273feafe MH |
299 | while (num_chunks--) { |
300 | if (data_in) | |
301 | din = buffer + rx_offset; | |
302 | dout = buffer; | |
b4141195 | 303 | tran_len = min(data_len, (size_t)max_tran_len); |
a444aa7a | 304 | num_blks = DIV_ROUND_UP(tran_len + cmd_len, 4); |
273feafe MH |
305 | num_bytes = (tran_len + cmd_len) % 4; |
306 | fsl->data_len = tran_len + cmd_len; | |
307 | spi_cs_activate(slave); | |
308 | ||
309 | /* Clear all eSPI events */ | |
310 | out_be32(&espi->event , 0xffffffff); | |
311 | /* handle data in 32-bit chunks */ | |
afb90706 | 312 | while (num_blks) { |
273feafe MH |
313 | event = in_be32(&espi->event); |
314 | if (event & ESPI_EV_TNF) { | |
afb90706 | 315 | fsl_espi_tx(fsl, dout); |
273feafe MH |
316 | /* Set up the next iteration */ |
317 | if (len > 4) { | |
318 | len -= 4; | |
319 | dout += 4; | |
320 | } | |
273feafe MH |
321 | } |
322 | ||
273feafe MH |
323 | event = in_be32(&espi->event); |
324 | if (event & ESPI_EV_RNE) { | |
afb90706 HZ |
325 | rf_cnt = ((event & ESPI_EV_RFCNT_MASK) |
326 | >> ESPI_EV_RFCNT_SHIFT); | |
327 | if (rf_cnt >= 4) | |
328 | rx_bytes = 4; | |
329 | else if (num_blks == 1 && rf_cnt == num_bytes) | |
330 | rx_bytes = num_bytes; | |
331 | else | |
332 | continue; | |
333 | if (fsl_espi_rx(fsl, din, rx_bytes) | |
334 | == rx_bytes) { | |
335 | num_blks--; | |
336 | if (din) | |
337 | din = (unsigned char *)din | |
338 | + rx_bytes; | |
273feafe | 339 | } |
273feafe MH |
340 | } |
341 | } | |
342 | if (data_in) { | |
343 | memcpy(data_in, buffer + 2 * cmd_len, tran_len); | |
344 | if (*buffer == 0x0b) { | |
345 | data_in += tran_len; | |
346 | data_len -= tran_len; | |
347 | *(int *)buffer += tran_len; | |
348 | } | |
349 | } | |
350 | spi_cs_deactivate(slave); | |
351 | } | |
352 | ||
353 | free(buffer); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | int spi_cs_is_valid(unsigned int bus, unsigned int cs) | |
358 | { | |
359 | return bus == 0 && cs < ESPI_MAX_CS_NUM; | |
360 | } | |
361 | ||
362 | void spi_cs_activate(struct spi_slave *slave) | |
363 | { | |
364 | struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); | |
afb90706 | 365 | ccsr_espi_t *espi = fsl->espi; |
273feafe MH |
366 | unsigned int com = 0; |
367 | size_t data_len = fsl->data_len; | |
368 | ||
369 | com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF)); | |
370 | com |= ESPI_COM_CS(slave->cs); | |
371 | com |= ESPI_COM_TRANLEN(data_len - 1); | |
372 | out_be32(&espi->com, com); | |
373 | } | |
374 | ||
375 | void spi_cs_deactivate(struct spi_slave *slave) | |
376 | { | |
afb90706 HZ |
377 | struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); |
378 | ccsr_espi_t *espi = fsl->espi; | |
273feafe MH |
379 | |
380 | /* clear the RXCNT and TXCNT */ | |
381 | out_be32(&espi->mode, in_be32(&espi->mode) & (~ESPI_MODE_EN)); | |
382 | out_be32(&espi->mode, in_be32(&espi->mode) | ESPI_MODE_EN); | |
383 | } |