1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2016 Carlo Caione <carlo@caione.org> 4 */ 5 6 #include <common.h> 7 #include <dm.h> 8 #include <fdtdec.h> 9 #include <malloc.h> 10 #include <mmc.h> 11 #include <asm/io.h> 12 #include <asm/arch/sd_emmc.h> 13 #include <linux/log2.h> 14 15 static inline void *get_regbase(const struct mmc *mmc) 16 { 17 struct meson_mmc_platdata *pdata = mmc->priv; 18 19 return pdata->regbase; 20 } 21 22 static inline uint32_t meson_read(struct mmc *mmc, int offset) 23 { 24 return readl(get_regbase(mmc) + offset); 25 } 26 27 static inline void meson_write(struct mmc *mmc, uint32_t val, int offset) 28 { 29 writel(val, get_regbase(mmc) + offset); 30 } 31 32 static void meson_mmc_config_clock(struct mmc *mmc) 33 { 34 uint32_t meson_mmc_clk = 0; 35 unsigned int clk, clk_src, clk_div; 36 37 if (!mmc->clock) 38 return; 39 40 /* 1GHz / CLK_MAX_DIV = 15,9 MHz */ 41 if (mmc->clock > 16000000) { 42 clk = SD_EMMC_CLKSRC_DIV2; 43 clk_src = CLK_SRC_DIV2; 44 } else { 45 clk = SD_EMMC_CLKSRC_24M; 46 clk_src = CLK_SRC_24M; 47 } 48 clk_div = DIV_ROUND_UP(clk, mmc->clock); 49 50 /* 180 phase core clock */ 51 meson_mmc_clk |= CLK_CO_PHASE_180; 52 53 /* 180 phase tx clock */ 54 meson_mmc_clk |= CLK_TX_PHASE_000; 55 56 /* clock settings */ 57 meson_mmc_clk |= clk_src; 58 meson_mmc_clk |= clk_div; 59 60 meson_write(mmc, meson_mmc_clk, MESON_SD_EMMC_CLOCK); 61 } 62 63 static int meson_dm_mmc_set_ios(struct udevice *dev) 64 { 65 struct mmc *mmc = mmc_get_mmc_dev(dev); 66 uint32_t meson_mmc_cfg; 67 68 meson_mmc_config_clock(mmc); 69 70 meson_mmc_cfg = meson_read(mmc, MESON_SD_EMMC_CFG); 71 72 meson_mmc_cfg &= ~CFG_BUS_WIDTH_MASK; 73 if (mmc->bus_width == 1) 74 meson_mmc_cfg |= CFG_BUS_WIDTH_1; 75 else if (mmc->bus_width == 4) 76 meson_mmc_cfg |= CFG_BUS_WIDTH_4; 77 else if (mmc->bus_width == 8) 78 meson_mmc_cfg |= CFG_BUS_WIDTH_8; 79 else 80 return -EINVAL; 81 82 /* 512 bytes block length */ 83 meson_mmc_cfg &= ~CFG_BL_LEN_MASK; 84 meson_mmc_cfg |= CFG_BL_LEN_512; 85 86 /* Response timeout 256 clk */ 87 meson_mmc_cfg &= ~CFG_RESP_TIMEOUT_MASK; 88 meson_mmc_cfg |= CFG_RESP_TIMEOUT_256; 89 90 /* Command-command gap 16 clk */ 91 meson_mmc_cfg &= ~CFG_RC_CC_MASK; 92 meson_mmc_cfg |= CFG_RC_CC_16; 93 94 meson_write(mmc, meson_mmc_cfg, MESON_SD_EMMC_CFG); 95 96 return 0; 97 } 98 99 static void meson_mmc_setup_cmd(struct mmc *mmc, struct mmc_data *data, 100 struct mmc_cmd *cmd) 101 { 102 uint32_t meson_mmc_cmd = 0, cfg; 103 104 meson_mmc_cmd |= cmd->cmdidx << CMD_CFG_CMD_INDEX_SHIFT; 105 106 if (cmd->resp_type & MMC_RSP_PRESENT) { 107 if (cmd->resp_type & MMC_RSP_136) 108 meson_mmc_cmd |= CMD_CFG_RESP_128; 109 110 if (cmd->resp_type & MMC_RSP_BUSY) 111 meson_mmc_cmd |= CMD_CFG_R1B; 112 113 if (!(cmd->resp_type & MMC_RSP_CRC)) 114 meson_mmc_cmd |= CMD_CFG_RESP_NOCRC; 115 } else { 116 meson_mmc_cmd |= CMD_CFG_NO_RESP; 117 } 118 119 if (data) { 120 cfg = meson_read(mmc, MESON_SD_EMMC_CFG); 121 cfg &= ~CFG_BL_LEN_MASK; 122 cfg |= ilog2(data->blocksize) << CFG_BL_LEN_SHIFT; 123 meson_write(mmc, cfg, MESON_SD_EMMC_CFG); 124 125 if (data->flags == MMC_DATA_WRITE) 126 meson_mmc_cmd |= CMD_CFG_DATA_WR; 127 128 meson_mmc_cmd |= CMD_CFG_DATA_IO | CMD_CFG_BLOCK_MODE | 129 data->blocks; 130 } 131 132 meson_mmc_cmd |= CMD_CFG_TIMEOUT_4S | CMD_CFG_OWNER | 133 CMD_CFG_END_OF_CHAIN; 134 135 meson_write(mmc, meson_mmc_cmd, MESON_SD_EMMC_CMD_CFG); 136 } 137 138 static void meson_mmc_setup_addr(struct mmc *mmc, struct mmc_data *data) 139 { 140 struct meson_mmc_platdata *pdata = mmc->priv; 141 unsigned int data_size; 142 uint32_t data_addr = 0; 143 144 if (data) { 145 data_size = data->blocks * data->blocksize; 146 147 if (data->flags == MMC_DATA_READ) { 148 data_addr = (ulong) data->dest; 149 invalidate_dcache_range(data_addr, 150 data_addr + data_size); 151 } else { 152 pdata->w_buf = calloc(data_size, sizeof(char)); 153 data_addr = (ulong) pdata->w_buf; 154 memcpy(pdata->w_buf, data->src, data_size); 155 flush_dcache_range(data_addr, data_addr + data_size); 156 } 157 } 158 159 meson_write(mmc, data_addr, MESON_SD_EMMC_CMD_DAT); 160 } 161 162 static void meson_mmc_read_response(struct mmc *mmc, struct mmc_cmd *cmd) 163 { 164 if (cmd->resp_type & MMC_RSP_136) { 165 cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP3); 166 cmd->response[1] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP2); 167 cmd->response[2] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP1); 168 cmd->response[3] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP); 169 } else { 170 cmd->response[0] = meson_read(mmc, MESON_SD_EMMC_CMD_RSP); 171 } 172 } 173 174 static int meson_dm_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, 175 struct mmc_data *data) 176 { 177 struct mmc *mmc = mmc_get_mmc_dev(dev); 178 struct meson_mmc_platdata *pdata = mmc->priv; 179 uint32_t status; 180 ulong start; 181 int ret = 0; 182 183 /* max block size supported by chip is 512 byte */ 184 if (data && data->blocksize > 512) 185 return -EINVAL; 186 187 meson_mmc_setup_cmd(mmc, data, cmd); 188 meson_mmc_setup_addr(mmc, data); 189 190 meson_write(mmc, cmd->cmdarg, MESON_SD_EMMC_CMD_ARG); 191 192 /* use 10s timeout */ 193 start = get_timer(0); 194 do { 195 status = meson_read(mmc, MESON_SD_EMMC_STATUS); 196 } while(!(status & STATUS_END_OF_CHAIN) && get_timer(start) < 10000); 197 198 if (!(status & STATUS_END_OF_CHAIN)) 199 ret = -ETIMEDOUT; 200 else if (status & STATUS_RESP_TIMEOUT) 201 ret = -ETIMEDOUT; 202 else if (status & STATUS_ERR_MASK) 203 ret = -EIO; 204 205 meson_mmc_read_response(mmc, cmd); 206 207 if (data && data->flags == MMC_DATA_WRITE) 208 free(pdata->w_buf); 209 210 /* reset status bits */ 211 meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS); 212 213 return ret; 214 } 215 216 static const struct dm_mmc_ops meson_dm_mmc_ops = { 217 .send_cmd = meson_dm_mmc_send_cmd, 218 .set_ios = meson_dm_mmc_set_ios, 219 }; 220 221 static int meson_mmc_ofdata_to_platdata(struct udevice *dev) 222 { 223 struct meson_mmc_platdata *pdata = dev_get_platdata(dev); 224 fdt_addr_t addr; 225 226 addr = devfdt_get_addr(dev); 227 if (addr == FDT_ADDR_T_NONE) 228 return -EINVAL; 229 230 pdata->regbase = (void *)addr; 231 232 return 0; 233 } 234 235 static int meson_mmc_probe(struct udevice *dev) 236 { 237 struct meson_mmc_platdata *pdata = dev_get_platdata(dev); 238 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); 239 struct mmc *mmc = &pdata->mmc; 240 struct mmc_config *cfg = &pdata->cfg; 241 uint32_t val; 242 243 cfg->voltages = MMC_VDD_33_34 | MMC_VDD_32_33 | 244 MMC_VDD_31_32 | MMC_VDD_165_195; 245 cfg->host_caps = MMC_MODE_8BIT | MMC_MODE_4BIT | 246 MMC_MODE_HS_52MHz | MMC_MODE_HS; 247 cfg->f_min = DIV_ROUND_UP(SD_EMMC_CLKSRC_24M, CLK_MAX_DIV); 248 cfg->f_max = 100000000; /* 100 MHz */ 249 cfg->b_max = 511; /* max 512 - 1 blocks */ 250 cfg->name = dev->name; 251 252 mmc->priv = pdata; 253 upriv->mmc = mmc; 254 255 mmc_set_clock(mmc, cfg->f_min, MMC_CLK_ENABLE); 256 257 /* reset all status bits */ 258 meson_write(mmc, STATUS_MASK, MESON_SD_EMMC_STATUS); 259 260 /* disable interrupts */ 261 meson_write(mmc, 0, MESON_SD_EMMC_IRQ_EN); 262 263 /* enable auto clock mode */ 264 val = meson_read(mmc, MESON_SD_EMMC_CFG); 265 val &= ~CFG_SDCLK_ALWAYS_ON; 266 val |= CFG_AUTO_CLK; 267 meson_write(mmc, val, MESON_SD_EMMC_CFG); 268 269 return 0; 270 } 271 272 int meson_mmc_bind(struct udevice *dev) 273 { 274 struct meson_mmc_platdata *pdata = dev_get_platdata(dev); 275 276 return mmc_bind(dev, &pdata->mmc, &pdata->cfg); 277 } 278 279 static const struct udevice_id meson_mmc_match[] = { 280 { .compatible = "amlogic,meson-gx-mmc" }, 281 { /* sentinel */ } 282 }; 283 284 U_BOOT_DRIVER(meson_mmc) = { 285 .name = "meson_gx_mmc", 286 .id = UCLASS_MMC, 287 .of_match = meson_mmc_match, 288 .ops = &meson_dm_mmc_ops, 289 .probe = meson_mmc_probe, 290 .bind = meson_mmc_bind, 291 .ofdata_to_platdata = meson_mmc_ofdata_to_platdata, 292 .platdata_auto_alloc_size = sizeof(struct meson_mmc_platdata), 293 }; 294