1 /* 2 * eSPI controller driver. 3 * 4 * Copyright 2010-2011 Freescale Semiconductor, Inc. 5 * Author: Mingkai Hu (Mingkai.hu@freescale.com) 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 20 * MA 02111-1307 USA 21 */ 22 23 #include <common.h> 24 25 #include <malloc.h> 26 #include <spi.h> 27 #include <asm/immap_85xx.h> 28 29 struct fsl_spi_slave { 30 struct spi_slave slave; 31 unsigned int div16; 32 unsigned int pm; 33 unsigned int mode; 34 size_t cmd_len; 35 u8 cmd_buf[16]; 36 size_t data_len; 37 unsigned int max_transfer_length; 38 }; 39 40 #define to_fsl_spi_slave(s) container_of(s, struct fsl_spi_slave, slave) 41 42 #define ESPI_MAX_CS_NUM 4 43 44 #define ESPI_EV_RNE (1 << 9) 45 #define ESPI_EV_TNF (1 << 8) 46 47 #define ESPI_MODE_EN (1 << 31) /* Enable interface */ 48 #define ESPI_MODE_TXTHR(x) ((x) << 8) /* Tx FIFO threshold */ 49 #define ESPI_MODE_RXTHR(x) ((x) << 0) /* Rx FIFO threshold */ 50 51 #define ESPI_COM_CS(x) ((x) << 30) 52 #define ESPI_COM_TRANLEN(x) ((x) << 0) 53 54 #define ESPI_CSMODE_CI_INACTIVEHIGH (1 << 31) 55 #define ESPI_CSMODE_CP_BEGIN_EDGCLK (1 << 30) 56 #define ESPI_CSMODE_REV_MSB_FIRST (1 << 29) 57 #define ESPI_CSMODE_DIV16 (1 << 28) 58 #define ESPI_CSMODE_PM(x) ((x) << 24) 59 #define ESPI_CSMODE_POL_ASSERTED_LOW (1 << 20) 60 #define ESPI_CSMODE_LEN(x) ((x) << 16) 61 #define ESPI_CSMODE_CSBEF(x) ((x) << 12) 62 #define ESPI_CSMODE_CSAFT(x) ((x) << 8) 63 #define ESPI_CSMODE_CSCG(x) ((x) << 3) 64 65 #define ESPI_CSMODE_INIT_VAL (ESPI_CSMODE_POL_ASSERTED_LOW | \ 66 ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \ 67 ESPI_CSMODE_CSCG(1)) 68 69 #define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0 70 71 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, 72 unsigned int max_hz, unsigned int mode) 73 { 74 struct fsl_spi_slave *fsl; 75 sys_info_t sysinfo; 76 unsigned long spibrg = 0; 77 unsigned char pm = 0; 78 79 if (!spi_cs_is_valid(bus, cs)) 80 return NULL; 81 82 fsl = malloc(sizeof(struct fsl_spi_slave)); 83 if (!fsl) 84 return NULL; 85 86 fsl->slave.bus = bus; 87 fsl->slave.cs = cs; 88 fsl->mode = mode; 89 fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN; 90 91 /* Set eSPI BRG clock source */ 92 get_sys_info(&sysinfo); 93 spibrg = sysinfo.freqSystemBus / 2; 94 fsl->div16 = 0; 95 if ((spibrg / max_hz) > 32) { 96 fsl->div16 = ESPI_CSMODE_DIV16; 97 pm = spibrg / (max_hz * 16 * 2); 98 if (pm > 16) { 99 pm = 16; 100 debug("Requested speed is too low: %d Hz, " 101 "%d Hz is used.\n", max_hz, spibrg / (32 * 16)); 102 } 103 } else 104 pm = spibrg / (max_hz * 2); 105 if (pm) 106 pm--; 107 fsl->pm = pm; 108 109 return &fsl->slave; 110 } 111 112 void spi_free_slave(struct spi_slave *slave) 113 { 114 struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); 115 free(fsl); 116 } 117 118 void spi_init(void) 119 { 120 121 } 122 123 int spi_claim_bus(struct spi_slave *slave) 124 { 125 struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); 126 ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); 127 unsigned char pm = fsl->pm; 128 unsigned int cs = slave->cs; 129 unsigned int mode = fsl->mode; 130 unsigned int div16 = fsl->div16; 131 int i; 132 133 debug("%s: bus:%i cs:%i\n", __func__, slave->bus, cs); 134 135 /* Enable eSPI interface */ 136 out_be32(&espi->mode, ESPI_MODE_RXTHR(3) 137 | ESPI_MODE_TXTHR(4) | ESPI_MODE_EN); 138 139 out_be32(&espi->event, 0xffffffff); /* Clear all eSPI events */ 140 out_be32(&espi->mask, 0x00000000); /* Mask all eSPI interrupts */ 141 142 /* Init CS mode interface */ 143 for (i = 0; i < ESPI_MAX_CS_NUM; i++) 144 out_be32(&espi->csmode[i], ESPI_CSMODE_INIT_VAL); 145 146 out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) & 147 ~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16 148 | ESPI_CSMODE_CI_INACTIVEHIGH | ESPI_CSMODE_CP_BEGIN_EDGCLK 149 | ESPI_CSMODE_REV_MSB_FIRST | ESPI_CSMODE_LEN(0xF))); 150 151 /* Set eSPI BRG clock source */ 152 out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) 153 | ESPI_CSMODE_PM(pm) | div16); 154 155 /* Set eSPI mode */ 156 if (mode & SPI_CPHA) 157 out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) 158 | ESPI_CSMODE_CP_BEGIN_EDGCLK); 159 if (mode & SPI_CPOL) 160 out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) 161 | ESPI_CSMODE_CI_INACTIVEHIGH); 162 163 /* Character bit order: msb first */ 164 out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) 165 | ESPI_CSMODE_REV_MSB_FIRST); 166 167 /* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */ 168 out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) 169 | ESPI_CSMODE_LEN(7)); 170 171 return 0; 172 } 173 174 void spi_release_bus(struct spi_slave *slave) 175 { 176 177 } 178 179 int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *data_out, 180 void *data_in, unsigned long flags) 181 { 182 struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); 183 ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); 184 unsigned int tmpdout, tmpdin, event; 185 const void *dout = NULL; 186 void *din = NULL; 187 int len = 0; 188 int num_blks, num_chunks, max_tran_len, tran_len; 189 int num_bytes; 190 unsigned char *ch; 191 unsigned char *buffer = NULL; 192 size_t buf_len; 193 u8 *cmd_buf = fsl->cmd_buf; 194 size_t cmd_len = fsl->cmd_len; 195 size_t data_len = bitlen / 8; 196 size_t rx_offset = 0; 197 198 max_tran_len = fsl->max_transfer_length; 199 switch (flags) { 200 case SPI_XFER_BEGIN: 201 cmd_len = fsl->cmd_len = data_len; 202 memcpy(cmd_buf, data_out, cmd_len); 203 return 0; 204 case 0: 205 case SPI_XFER_END: 206 if (bitlen == 0) { 207 spi_cs_deactivate(slave); 208 return 0; 209 } 210 buf_len = 2 * cmd_len + min(data_len, max_tran_len); 211 len = cmd_len + data_len; 212 rx_offset = cmd_len; 213 buffer = (unsigned char *)malloc(buf_len); 214 if (!buffer) { 215 debug("SF: Failed to malloc memory.\n"); 216 return 1; 217 } 218 memcpy(buffer, cmd_buf, cmd_len); 219 if (cmd_len != 1) { 220 if (data_in == NULL) 221 memcpy(buffer + cmd_len, data_out, data_len); 222 } 223 break; 224 case SPI_XFER_BEGIN | SPI_XFER_END: 225 len = data_len; 226 buffer = (unsigned char *)malloc(len * 2); 227 if (!buffer) { 228 debug("SF: Failed to malloc memory.\n"); 229 return 1; 230 } 231 memcpy(buffer, data_out, len); 232 rx_offset = len; 233 cmd_len = 0; 234 break; 235 } 236 237 debug("spi_xfer: slave %u:%u dout %08X(%08x) din %08X(%08x) len %u\n", 238 slave->bus, slave->cs, *(uint *) dout, 239 dout, *(uint *) din, din, len); 240 241 num_chunks = data_len / max_tran_len + 242 (data_len % max_tran_len ? 1 : 0); 243 while (num_chunks--) { 244 if (data_in) 245 din = buffer + rx_offset; 246 dout = buffer; 247 tran_len = min(data_len , max_tran_len); 248 num_blks = (tran_len + cmd_len) / 4 + 249 ((tran_len + cmd_len) % 4 ? 1 : 0); 250 num_bytes = (tran_len + cmd_len) % 4; 251 fsl->data_len = tran_len + cmd_len; 252 spi_cs_activate(slave); 253 254 /* Clear all eSPI events */ 255 out_be32(&espi->event , 0xffffffff); 256 /* handle data in 32-bit chunks */ 257 while (num_blks--) { 258 259 event = in_be32(&espi->event); 260 if (event & ESPI_EV_TNF) { 261 tmpdout = *(u32 *)dout; 262 263 /* Set up the next iteration */ 264 if (len > 4) { 265 len -= 4; 266 dout += 4; 267 } 268 269 out_be32(&espi->tx, tmpdout); 270 out_be32(&espi->event, ESPI_EV_TNF); 271 debug("***spi_xfer:...%08x written\n", tmpdout); 272 } 273 274 /* Wait for eSPI transmit to get out */ 275 udelay(80); 276 277 event = in_be32(&espi->event); 278 if (event & ESPI_EV_RNE) { 279 tmpdin = in_be32(&espi->rx); 280 if (num_blks == 0 && num_bytes != 0) { 281 ch = (unsigned char *)&tmpdin; 282 while (num_bytes--) 283 *(unsigned char *)din++ = *ch++; 284 } else { 285 *(u32 *) din = tmpdin; 286 din += 4; 287 } 288 289 out_be32(&espi->event, in_be32(&espi->event) 290 | ESPI_EV_RNE); 291 debug("***spi_xfer:...%08x readed\n", tmpdin); 292 } 293 } 294 if (data_in) { 295 memcpy(data_in, buffer + 2 * cmd_len, tran_len); 296 if (*buffer == 0x0b) { 297 data_in += tran_len; 298 data_len -= tran_len; 299 *(int *)buffer += tran_len; 300 } 301 } 302 spi_cs_deactivate(slave); 303 } 304 305 free(buffer); 306 return 0; 307 } 308 309 int spi_cs_is_valid(unsigned int bus, unsigned int cs) 310 { 311 return bus == 0 && cs < ESPI_MAX_CS_NUM; 312 } 313 314 void spi_cs_activate(struct spi_slave *slave) 315 { 316 struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave); 317 ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); 318 unsigned int com = 0; 319 size_t data_len = fsl->data_len; 320 321 com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF)); 322 com |= ESPI_COM_CS(slave->cs); 323 com |= ESPI_COM_TRANLEN(data_len - 1); 324 out_be32(&espi->com, com); 325 } 326 327 void spi_cs_deactivate(struct spi_slave *slave) 328 { 329 ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR); 330 331 /* clear the RXCNT and TXCNT */ 332 out_be32(&espi->mode, in_be32(&espi->mode) & (~ESPI_MODE_EN)); 333 out_be32(&espi->mode, in_be32(&espi->mode) | ESPI_MODE_EN); 334 } 335