drivers/mmc/bfin_sdh.c

   1 /*
   2  * Driver for Blackfin on-chip SDH controller
   3  *
   4  * Copyright (c) 2008-2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <common.h>
  10 #include <malloc.h>
  11 #include <part.h>
  12 #include <mmc.h>
  13
  14 #include <asm/io.h>
  15 #include <asm/errno.h>
  16 #include <asm/byteorder.h>
  17 #include <asm/blackfin.h>
  18 #include <asm/portmux.h>
  19 #include <asm/mach-common/bits/sdh.h>
  20 #include <asm/mach-common/bits/dma.h>
  21
  22 #if defined(__ADSPBF50x__) || defined(__ADSPBF51x__)
  23 # define bfin_read_SDH_PWR_CTL          bfin_read_RSI_PWR_CONTROL
  24 # define bfin_write_SDH_PWR_CTL         bfin_write_RSI_PWR_CONTROL
  25 # define bfin_read_SDH_CLK_CTL          bfin_read_RSI_CLK_CONTROL
  26 # define bfin_write_SDH_CLK_CTL         bfin_write_RSI_CLK_CONTROL
  27 # define bfin_write_SDH_ARGUMENT        bfin_write_RSI_ARGUMENT
  28 # define bfin_write_SDH_COMMAND         bfin_write_RSI_COMMAND
  29 # define bfin_read_SDH_RESPONSE0        bfin_read_RSI_RESPONSE0
  30 # define bfin_read_SDH_RESPONSE1        bfin_read_RSI_RESPONSE1
  31 # define bfin_read_SDH_RESPONSE2        bfin_read_RSI_RESPONSE2
  32 # define bfin_read_SDH_RESPONSE3        bfin_read_RSI_RESPONSE3
  33 # define bfin_write_SDH_DATA_TIMER      bfin_write_RSI_DATA_TIMER
  34 # define bfin_write_SDH_DATA_LGTH       bfin_write_RSI_DATA_LGTH
  35 # define bfin_read_SDH_DATA_CTL         bfin_read_RSI_DATA_CONTROL
  36 # define bfin_write_SDH_DATA_CTL        bfin_write_RSI_DATA_CONTROL
  37 # define bfin_read_SDH_STATUS           bfin_read_RSI_STATUS
  38 # define bfin_write_SDH_STATUS_CLR      bfin_write_RSI_STATUSCL
  39 # define bfin_read_SDH_CFG              bfin_read_RSI_CONFIG
  40 # define bfin_write_SDH_CFG             bfin_write_RSI_CONFIG
  41 # define bfin_write_DMA_START_ADDR      bfin_write_DMA4_START_ADDR
  42 # define bfin_write_DMA_X_COUNT         bfin_write_DMA4_X_COUNT
  43 # define bfin_write_DMA_X_MODIFY        bfin_write_DMA4_X_MODIFY
  44 # define bfin_write_DMA_CONFIG          bfin_write_DMA4_CONFIG
  45 # define PORTMUX_PINS \
  46         { P_RSI_DATA0, P_RSI_DATA1, P_RSI_DATA2, P_RSI_DATA3, P_RSI_CMD, P_RSI_CLK, 0 }
  47 #elif defined(__ADSPBF54x__)
  48 # define bfin_write_DMA_START_ADDR      bfin_write_DMA22_START_ADDR
  49 # define bfin_write_DMA_X_COUNT         bfin_write_DMA22_X_COUNT
  50 # define bfin_write_DMA_X_MODIFY        bfin_write_DMA22_X_MODIFY
  51 # define bfin_write_DMA_CONFIG          bfin_write_DMA22_CONFIG
  52 # define PORTMUX_PINS \
  53         { P_SD_D0, P_SD_D1, P_SD_D2, P_SD_D3, P_SD_CLK, P_SD_CMD, 0 }
  54 #else
  55 # error no support for this proc yet
  56 #endif
  57
  58 static int
  59 sdh_send_cmd(struct mmc *mmc, struct mmc_cmd *mmc_cmd)
  60 {
  61         unsigned int status, timeout;
  62         int cmd = mmc_cmd->cmdidx;
  63         int flags = mmc_cmd->resp_type;
  64         int arg = mmc_cmd->cmdarg;
  65         int ret;
  66         u16 sdh_cmd;
  67
  68         sdh_cmd = cmd | CMD_E;
  69         if (flags & MMC_RSP_PRESENT)
  70                 sdh_cmd |= CMD_RSP;
  71         if (flags & MMC_RSP_136)
  72                 sdh_cmd |= CMD_L_RSP;
  73
  74         bfin_write_SDH_ARGUMENT(arg);
  75         bfin_write_SDH_COMMAND(sdh_cmd);
  76
  77         /* wait for a while */
  78         timeout = 0;
  79         do {
  80                 if (++timeout > 1000000) {
  81                         status = CMD_TIME_OUT;
  82                         break;
  83                 }
  84                 udelay(1);
  85                 status = bfin_read_SDH_STATUS();
  86         } while (!(status & (CMD_SENT | CMD_RESP_END | CMD_TIME_OUT |
  87                 CMD_CRC_FAIL)));
  88
  89         if (flags & MMC_RSP_PRESENT) {
  90                 mmc_cmd->response[0] = bfin_read_SDH_RESPONSE0();
  91                 if (flags & MMC_RSP_136) {
  92                         mmc_cmd->response[1] = bfin_read_SDH_RESPONSE1();
  93                         mmc_cmd->response[2] = bfin_read_SDH_RESPONSE2();
  94                         mmc_cmd->response[3] = bfin_read_SDH_RESPONSE3();
  95                 }
  96         }
  97
  98         if (status & CMD_TIME_OUT)
  99                 ret = TIMEOUT;
 100         else if (status & CMD_CRC_FAIL && flags & MMC_RSP_CRC)
 101                 ret = COMM_ERR;
 102         else
 103                 ret = 0;
 104
 105         bfin_write_SDH_STATUS_CLR(CMD_SENT_STAT | CMD_RESP_END_STAT |
 106                                 CMD_TIMEOUT_STAT | CMD_CRC_FAIL_STAT);
 107
 108         return ret;
 109 }
 110
 111 /* set data for single block transfer */
 112 static int sdh_setup_data(struct mmc *mmc, struct mmc_data *data)
 113 {
 114         u16 data_ctl = 0;
 115         u16 dma_cfg = 0;
 116         int ret = 0;
 117         unsigned long data_size = data->blocksize * data->blocks;
 118
 119         /* Don't support write yet. */
 120         if (data->flags & MMC_DATA_WRITE)
 121                 return UNUSABLE_ERR;
 122         data_ctl |= ((ffs(data_size) - 1) << 4);
 123         data_ctl |= DTX_DIR;
 124         bfin_write_SDH_DATA_CTL(data_ctl);
 125         dma_cfg = WDSIZE_32 | RESTART | WNR | DMAEN;
 126
 127         bfin_write_SDH_DATA_TIMER(-1);
 128
 129         blackfin_dcache_flush_invalidate_range(data->dest,
 130                         data->dest + data_size);
 131         /* configure DMA */
 132         bfin_write_DMA_START_ADDR(data->dest);
 133         bfin_write_DMA_X_COUNT(data_size / 4);
 134         bfin_write_DMA_X_MODIFY(4);
 135         bfin_write_DMA_CONFIG(dma_cfg);
 136         bfin_write_SDH_DATA_LGTH(data_size);
 137         /* kick off transfer */
 138         bfin_write_SDH_DATA_CTL(bfin_read_SDH_DATA_CTL() | DTX_DMA_E | DTX_E);
 139
 140         return ret;
 141 }
 142
 143
 144 static int bfin_sdh_request(struct mmc *mmc, struct mmc_cmd *cmd,
 145                 struct mmc_data *data)
 146 {
 147         u32 status;
 148         int ret = 0;
 149
 150         ret = sdh_send_cmd(mmc, cmd);
 151         if (ret) {
 152                 printf("sending CMD%d failed\n", cmd->cmdidx);
 153                 return ret;
 154         }
 155         if (data) {
 156                 ret = sdh_setup_data(mmc, data);
 157                 do {
 158                         udelay(1);
 159                         status = bfin_read_SDH_STATUS();
 160                 } while (!(status & (DAT_BLK_END | DAT_END | DAT_TIME_OUT | DAT_CRC_FAIL | RX_OVERRUN)));
 161
 162                 if (status & DAT_TIME_OUT) {
 163                         bfin_write_SDH_STATUS_CLR(DAT_TIMEOUT_STAT);
 164                         ret |= TIMEOUT;
 165                 } else if (status & (DAT_CRC_FAIL | RX_OVERRUN)) {
 166                         bfin_write_SDH_STATUS_CLR(DAT_CRC_FAIL_STAT | RX_OVERRUN_STAT);
 167                         ret |= COMM_ERR;
 168                 } else
 169                         bfin_write_SDH_STATUS_CLR(DAT_BLK_END_STAT | DAT_END_STAT);
 170
 171                 if (ret) {
 172                         printf("tranfering data failed\n");
 173                         return ret;
 174                 }
 175         }
 176         return 0;
 177 }
 178
 179 static void sdh_set_clk(unsigned long clk)
 180 {
 181         unsigned long sys_clk;
 182         unsigned long clk_div;
 183         u16 clk_ctl = 0;
 184
 185         clk_ctl = bfin_read_SDH_CLK_CTL();
 186         if (clk) {
 187                 /* setting SD_CLK */
 188                 sys_clk = get_sclk();
 189                 bfin_write_SDH_CLK_CTL(clk_ctl & ~CLK_E);
 190                 if (sys_clk % (2 * clk) == 0)
 191                         clk_div = sys_clk / (2 * clk) - 1;
 192                 else
 193                         clk_div = sys_clk / (2 * clk);
 194
 195                 if (clk_div > 0xff)
 196                         clk_div = 0xff;
 197                 clk_ctl |= (clk_div & 0xff);
 198                 clk_ctl |= CLK_E;
 199                 bfin_write_SDH_CLK_CTL(clk_ctl);
 200         } else
 201                 bfin_write_SDH_CLK_CTL(clk_ctl & ~CLK_E);
 202 }
 203
 204 static void bfin_sdh_set_ios(struct mmc *mmc)
 205 {
 206         u16 cfg = 0;
 207         u16 clk_ctl = 0;
 208
 209         if (mmc->bus_width == 4) {
 210                 cfg = bfin_read_SDH_CFG();
 211                 cfg &= ~0x80;
 212                 cfg |= 0x40;
 213                 bfin_write_SDH_CFG(cfg);
 214                 clk_ctl |= WIDE_BUS;
 215         }
 216         bfin_write_SDH_CLK_CTL(clk_ctl);
 217         sdh_set_clk(mmc->clock);
 218 }
 219
 220 static int bfin_sdh_init(struct mmc *mmc)
 221 {
 222         const unsigned short pins[] = PORTMUX_PINS;
 223         u16 pwr_ctl = 0;
 224
 225         /* Initialize sdh controller */
 226         peripheral_request_list(pins, "bfin_sdh");
 227 #if defined(__ADSPBF54x__)
 228         bfin_write_DMAC1_PERIMUX(bfin_read_DMAC1_PERIMUX() | 0x1);
 229 #endif
 230         bfin_write_SDH_CFG(bfin_read_SDH_CFG() | CLKS_EN);
 231         /* Disable card detect pin */
 232         bfin_write_SDH_CFG((bfin_read_SDH_CFG() & 0x1F) | 0x60);
 233
 234         pwr_ctl |= ROD_CTL;
 235         pwr_ctl |= PWR_ON;
 236         bfin_write_SDH_PWR_CTL(pwr_ctl);
 237         return 0;
 238 }
 239
 240
 241 int bfin_mmc_init(bd_t *bis)
 242 {
 243         struct mmc *mmc = NULL;
 244
 245         mmc = malloc(sizeof(struct mmc));
 246
 247         if (!mmc)
 248                 return -ENOMEM;
 249         sprintf(mmc->name, "Blackfin SDH");
 250         mmc->send_cmd = bfin_sdh_request;
 251         mmc->set_ios = bfin_sdh_set_ios;
 252         mmc->init = bfin_sdh_init;
 253         mmc->getcd = NULL;
 254         mmc->host_caps = MMC_MODE_4BIT;
 255
 256         mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
 257         mmc->f_max = get_sclk();
 258         mmc->f_min = mmc->f_max >> 9;
 259
 260         mmc->b_max = 0;
 261
 262         mmc_register(mmc);
 263
 264         return 0;
 265 }