fsl_espi.c 9.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383
  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * eSPI controller driver.
  4. *
  5. * Copyright 2010-2011 Freescale Semiconductor, Inc.
  6. * Author: Mingkai Hu (Mingkai.hu@freescale.com)
  7. */
  8. #include <common.h>
  9. #include <malloc.h>
  10. #include <spi.h>
  11. #include <asm/immap_85xx.h>
  12. struct fsl_spi_slave {
  13. struct spi_slave slave;
  14. ccsr_espi_t *espi;
  15. unsigned int div16;
  16. unsigned int pm;
  17. int tx_timeout;
  18. unsigned int mode;
  19. size_t cmd_len;
  20. u8 cmd_buf[16];
  21. size_t data_len;
  22. unsigned int max_transfer_length;
  23. };
  24. #define to_fsl_spi_slave(s) container_of(s, struct fsl_spi_slave, slave)
  25. #define US_PER_SECOND 1000000UL
  26. #define ESPI_MAX_CS_NUM 4
  27. #define ESPI_FIFO_WIDTH_BIT 32
  28. #define ESPI_EV_RNE BIT(9)
  29. #define ESPI_EV_TNF BIT(8)
  30. #define ESPI_EV_DON BIT(14)
  31. #define ESPI_EV_TXE BIT(15)
  32. #define ESPI_EV_RFCNT_SHIFT 24
  33. #define ESPI_EV_RFCNT_MASK (0x3f << ESPI_EV_RFCNT_SHIFT)
  34. #define ESPI_MODE_EN BIT(31) /* Enable interface */
  35. #define ESPI_MODE_TXTHR(x) ((x) << 8) /* Tx FIFO threshold */
  36. #define ESPI_MODE_RXTHR(x) ((x) << 0) /* Rx FIFO threshold */
  37. #define ESPI_COM_CS(x) ((x) << 30)
  38. #define ESPI_COM_TRANLEN(x) ((x) << 0)
  39. #define ESPI_CSMODE_CI_INACTIVEHIGH BIT(31)
  40. #define ESPI_CSMODE_CP_BEGIN_EDGCLK BIT(30)
  41. #define ESPI_CSMODE_REV_MSB_FIRST BIT(29)
  42. #define ESPI_CSMODE_DIV16 BIT(28)
  43. #define ESPI_CSMODE_PM(x) ((x) << 24)
  44. #define ESPI_CSMODE_POL_ASSERTED_LOW BIT(20)
  45. #define ESPI_CSMODE_LEN(x) ((x) << 16)
  46. #define ESPI_CSMODE_CSBEF(x) ((x) << 12)
  47. #define ESPI_CSMODE_CSAFT(x) ((x) << 8)
  48. #define ESPI_CSMODE_CSCG(x) ((x) << 3)
  49. #define ESPI_CSMODE_INIT_VAL (ESPI_CSMODE_POL_ASSERTED_LOW | \
  50. ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \
  51. ESPI_CSMODE_CSCG(1))
  52. #define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0
  53. struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
  54. unsigned int max_hz, unsigned int mode)
  55. {
  56. struct fsl_spi_slave *fsl;
  57. sys_info_t sysinfo;
  58. unsigned long spibrg = 0;
  59. unsigned long spi_freq = 0;
  60. unsigned char pm = 0;
  61. if (!spi_cs_is_valid(bus, cs))
  62. return NULL;
  63. fsl = spi_alloc_slave(struct fsl_spi_slave, bus, cs);
  64. if (!fsl)
  65. return NULL;
  66. fsl->espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR);
  67. fsl->mode = mode;
  68. fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN;
  69. /* Set eSPI BRG clock source */
  70. get_sys_info(&sysinfo);
  71. spibrg = sysinfo.freq_systembus / 2;
  72. fsl->div16 = 0;
  73. if ((spibrg / max_hz) > 32) {
  74. fsl->div16 = ESPI_CSMODE_DIV16;
  75. pm = spibrg / (max_hz * 16 * 2);
  76. if (pm > 16) {
  77. pm = 16;
  78. debug("Requested speed is too low: %d Hz, %ld Hz "
  79. "is used.\n", max_hz, spibrg / (32 * 16));
  80. }
  81. } else
  82. pm = spibrg / (max_hz * 2);
  83. if (pm)
  84. pm--;
  85. fsl->pm = pm;
  86. if (fsl->div16)
  87. spi_freq = spibrg / ((pm + 1) * 2 * 16);
  88. else
  89. spi_freq = spibrg / ((pm + 1) * 2);
  90. /* set tx_timeout to 10 times of one espi FIFO entry go out */
  91. fsl->tx_timeout = DIV_ROUND_UP((US_PER_SECOND * ESPI_FIFO_WIDTH_BIT
  92. * 10), spi_freq);
  93. return &fsl->slave;
  94. }
  95. void spi_free_slave(struct spi_slave *slave)
  96. {
  97. struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
  98. free(fsl);
  99. }
  100. int spi_claim_bus(struct spi_slave *slave)
  101. {
  102. struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
  103. ccsr_espi_t *espi = fsl->espi;
  104. unsigned char pm = fsl->pm;
  105. unsigned int cs = slave->cs;
  106. unsigned int mode = fsl->mode;
  107. unsigned int div16 = fsl->div16;
  108. int i;
  109. debug("%s: bus:%i cs:%i\n", __func__, slave->bus, cs);
  110. /* Enable eSPI interface */
  111. out_be32(&espi->mode, ESPI_MODE_RXTHR(3)
  112. | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN);
  113. out_be32(&espi->event, 0xffffffff); /* Clear all eSPI events */
  114. out_be32(&espi->mask, 0x00000000); /* Mask all eSPI interrupts */
  115. /* Init CS mode interface */
  116. for (i = 0; i < ESPI_MAX_CS_NUM; i++)
  117. out_be32(&espi->csmode[i], ESPI_CSMODE_INIT_VAL);
  118. out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) &
  119. ~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16
  120. | ESPI_CSMODE_CI_INACTIVEHIGH | ESPI_CSMODE_CP_BEGIN_EDGCLK
  121. | ESPI_CSMODE_REV_MSB_FIRST | ESPI_CSMODE_LEN(0xF)));
  122. /* Set eSPI BRG clock source */
  123. out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
  124. | ESPI_CSMODE_PM(pm) | div16);
  125. /* Set eSPI mode */
  126. if (mode & SPI_CPHA)
  127. out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
  128. | ESPI_CSMODE_CP_BEGIN_EDGCLK);
  129. if (mode & SPI_CPOL)
  130. out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
  131. | ESPI_CSMODE_CI_INACTIVEHIGH);
  132. /* Character bit order: msb first */
  133. out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
  134. | ESPI_CSMODE_REV_MSB_FIRST);
  135. /* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */
  136. out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
  137. | ESPI_CSMODE_LEN(7));
  138. return 0;
  139. }
  140. void spi_release_bus(struct spi_slave *slave)
  141. {
  142. }
  143. static void fsl_espi_tx(struct fsl_spi_slave *fsl, const void *dout)
  144. {
  145. ccsr_espi_t *espi = fsl->espi;
  146. unsigned int tmpdout, event;
  147. int tmp_tx_timeout;
  148. if (dout)
  149. tmpdout = *(u32 *)dout;
  150. else
  151. tmpdout = 0;
  152. out_be32(&espi->tx, tmpdout);
  153. out_be32(&espi->event, ESPI_EV_TNF);
  154. debug("***spi_xfer:...%08x written\n", tmpdout);
  155. tmp_tx_timeout = fsl->tx_timeout;
  156. /* Wait for eSPI transmit to go out */
  157. while (tmp_tx_timeout--) {
  158. event = in_be32(&espi->event);
  159. if (event & ESPI_EV_DON || event & ESPI_EV_TXE) {
  160. out_be32(&espi->event, ESPI_EV_TXE);
  161. break;
  162. }
  163. udelay(1);
  164. }
  165. if (tmp_tx_timeout < 0)
  166. debug("***spi_xfer:...Tx timeout! event = %08x\n", event);
  167. }
  168. static int fsl_espi_rx(struct fsl_spi_slave *fsl, void *din, unsigned int bytes)
  169. {
  170. ccsr_espi_t *espi = fsl->espi;
  171. unsigned int tmpdin, rx_times;
  172. unsigned char *buf, *p_cursor;
  173. if (bytes <= 0)
  174. return 0;
  175. rx_times = DIV_ROUND_UP(bytes, 4);
  176. buf = (unsigned char *)malloc(4 * rx_times);
  177. if (!buf) {
  178. debug("SF: Failed to malloc memory.\n");
  179. return -1;
  180. }
  181. p_cursor = buf;
  182. while (rx_times--) {
  183. tmpdin = in_be32(&espi->rx);
  184. debug("***spi_xfer:...%08x readed\n", tmpdin);
  185. *(u32 *)p_cursor = tmpdin;
  186. p_cursor += 4;
  187. }
  188. if (din)
  189. memcpy(din, buf, bytes);
  190. free(buf);
  191. out_be32(&espi->event, ESPI_EV_RNE);
  192. return bytes;
  193. }
  194. int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *data_out,
  195. void *data_in, unsigned long flags)
  196. {
  197. struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
  198. ccsr_espi_t *espi = fsl->espi;
  199. unsigned int event, rx_bytes;
  200. const void *dout = NULL;
  201. void *din = NULL;
  202. int len = 0;
  203. int num_blks, num_chunks, max_tran_len, tran_len;
  204. int num_bytes;
  205. unsigned char *buffer = NULL;
  206. size_t buf_len;
  207. u8 *cmd_buf = fsl->cmd_buf;
  208. size_t cmd_len = fsl->cmd_len;
  209. size_t data_len = bitlen / 8;
  210. size_t rx_offset = 0;
  211. int rf_cnt;
  212. max_tran_len = fsl->max_transfer_length;
  213. switch (flags) {
  214. case SPI_XFER_BEGIN:
  215. cmd_len = fsl->cmd_len = data_len;
  216. memcpy(cmd_buf, data_out, cmd_len);
  217. return 0;
  218. case 0:
  219. case SPI_XFER_END:
  220. if (bitlen == 0) {
  221. spi_cs_deactivate(slave);
  222. return 0;
  223. }
  224. buf_len = 2 * cmd_len + min(data_len, (size_t)max_tran_len);
  225. len = cmd_len + data_len;
  226. rx_offset = cmd_len;
  227. buffer = (unsigned char *)malloc(buf_len);
  228. if (!buffer) {
  229. debug("SF: Failed to malloc memory.\n");
  230. return 1;
  231. }
  232. memcpy(buffer, cmd_buf, cmd_len);
  233. if (data_in == NULL)
  234. memcpy(buffer + cmd_len, data_out, data_len);
  235. break;
  236. case SPI_XFER_BEGIN | SPI_XFER_END:
  237. len = data_len;
  238. buffer = (unsigned char *)malloc(len * 2);
  239. if (!buffer) {
  240. debug("SF: Failed to malloc memory.\n");
  241. return 1;
  242. }
  243. memcpy(buffer, data_out, len);
  244. rx_offset = len;
  245. cmd_len = 0;
  246. break;
  247. }
  248. debug("spi_xfer: data_out %08X(%p) data_in %08X(%p) len %u\n",
  249. *(uint *)data_out, data_out, *(uint *)data_in, data_in, len);
  250. num_chunks = DIV_ROUND_UP(data_len, max_tran_len);
  251. while (num_chunks--) {
  252. if (data_in)
  253. din = buffer + rx_offset;
  254. dout = buffer;
  255. tran_len = min(data_len, (size_t)max_tran_len);
  256. num_blks = DIV_ROUND_UP(tran_len + cmd_len, 4);
  257. num_bytes = (tran_len + cmd_len) % 4;
  258. fsl->data_len = tran_len + cmd_len;
  259. spi_cs_activate(slave);
  260. /* Clear all eSPI events */
  261. out_be32(&espi->event , 0xffffffff);
  262. /* handle data in 32-bit chunks */
  263. while (num_blks) {
  264. event = in_be32(&espi->event);
  265. if (event & ESPI_EV_TNF) {
  266. fsl_espi_tx(fsl, dout);
  267. /* Set up the next iteration */
  268. if (len > 4) {
  269. len -= 4;
  270. dout += 4;
  271. }
  272. }
  273. event = in_be32(&espi->event);
  274. if (event & ESPI_EV_RNE) {
  275. rf_cnt = ((event & ESPI_EV_RFCNT_MASK)
  276. >> ESPI_EV_RFCNT_SHIFT);
  277. if (rf_cnt >= 4)
  278. rx_bytes = 4;
  279. else if (num_blks == 1 && rf_cnt == num_bytes)
  280. rx_bytes = num_bytes;
  281. else
  282. continue;
  283. if (fsl_espi_rx(fsl, din, rx_bytes)
  284. == rx_bytes) {
  285. num_blks--;
  286. if (din)
  287. din = (unsigned char *)din
  288. + rx_bytes;
  289. }
  290. }
  291. }
  292. if (data_in) {
  293. memcpy(data_in, buffer + 2 * cmd_len, tran_len);
  294. if (*buffer == 0x0b) {
  295. data_in += tran_len;
  296. data_len -= tran_len;
  297. *(int *)buffer += tran_len;
  298. }
  299. }
  300. spi_cs_deactivate(slave);
  301. }
  302. free(buffer);
  303. return 0;
  304. }
  305. int spi_cs_is_valid(unsigned int bus, unsigned int cs)
  306. {
  307. return bus == 0 && cs < ESPI_MAX_CS_NUM;
  308. }
  309. void spi_cs_activate(struct spi_slave *slave)
  310. {
  311. struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
  312. ccsr_espi_t *espi = fsl->espi;
  313. unsigned int com = 0;
  314. size_t data_len = fsl->data_len;
  315. com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF));
  316. com |= ESPI_COM_CS(slave->cs);
  317. com |= ESPI_COM_TRANLEN(data_len - 1);
  318. out_be32(&espi->com, com);
  319. }
  320. void spi_cs_deactivate(struct spi_slave *slave)
  321. {
  322. struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
  323. ccsr_espi_t *espi = fsl->espi;
  324. /* clear the RXCNT and TXCNT */
  325. out_be32(&espi->mode, in_be32(&espi->mode) & (~ESPI_MODE_EN));
  326. out_be32(&espi->mode, in_be32(&espi->mode) | ESPI_MODE_EN);
  327. }