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