1 /* 2 * (C) Copyright 2012 SAMSUNG Electronics 3 * Jaehoon Chung <jh80.chung@samsung.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dwmmc.h> 10 #include <fdtdec.h> 11 #include <linux/libfdt.h> 12 #include <malloc.h> 13 #include <errno.h> 14 #include <asm/arch/dwmmc.h> 15 #include <asm/arch/clk.h> 16 #include <asm/arch/pinmux.h> 17 #include <asm/arch/power.h> 18 #include <asm/gpio.h> 19 20 #define DWMMC_MAX_CH_NUM 4 21 #define DWMMC_MAX_FREQ 52000000 22 #define DWMMC_MIN_FREQ 400000 23 #define DWMMC_MMC0_SDR_TIMING_VAL 0x03030001 24 #define DWMMC_MMC2_SDR_TIMING_VAL 0x03020001 25 26 #ifdef CONFIG_DM_MMC 27 #include <dm.h> 28 DECLARE_GLOBAL_DATA_PTR; 29 30 struct exynos_mmc_plat { 31 struct mmc_config cfg; 32 struct mmc mmc; 33 }; 34 #endif 35 36 /* Exynos implmentation specific drver private data */ 37 struct dwmci_exynos_priv_data { 38 #ifdef CONFIG_DM_MMC 39 struct dwmci_host host; 40 #endif 41 u32 sdr_timing; 42 }; 43 44 /* 45 * Function used as callback function to initialise the 46 * CLKSEL register for every mmc channel. 47 */ 48 static void exynos_dwmci_clksel(struct dwmci_host *host) 49 { 50 struct dwmci_exynos_priv_data *priv = host->priv; 51 52 dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing); 53 } 54 55 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq) 56 { 57 unsigned long sclk; 58 int8_t clk_div; 59 60 /* 61 * Since SDCLKIN is divided inside controller by the DIVRATIO 62 * value set in the CLKSEL register, we need to use the same output 63 * clock value to calculate the CLKDIV value. 64 * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1) 65 */ 66 clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT) 67 & DWMCI_DIVRATIO_MASK) + 1; 68 sclk = get_mmc_clk(host->dev_index); 69 70 /* 71 * Assume to know divider value. 72 * When clock unit is broken, need to set "host->div" 73 */ 74 return sclk / clk_div / (host->div + 1); 75 } 76 77 static void exynos_dwmci_board_init(struct dwmci_host *host) 78 { 79 struct dwmci_exynos_priv_data *priv = host->priv; 80 81 if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) { 82 dwmci_writel(host, EMMCP_MPSBEGIN0, 0); 83 dwmci_writel(host, EMMCP_SEND0, 0); 84 dwmci_writel(host, EMMCP_CTRL0, 85 MPSCTRL_SECURE_READ_BIT | 86 MPSCTRL_SECURE_WRITE_BIT | 87 MPSCTRL_NON_SECURE_READ_BIT | 88 MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID); 89 } 90 91 /* Set to timing value at initial time */ 92 if (priv->sdr_timing) 93 exynos_dwmci_clksel(host); 94 } 95 96 static int exynos_dwmci_core_init(struct dwmci_host *host) 97 { 98 unsigned int div; 99 unsigned long freq, sclk; 100 101 if (host->bus_hz) 102 freq = host->bus_hz; 103 else 104 freq = DWMMC_MAX_FREQ; 105 106 /* request mmc clock vlaue of 52MHz. */ 107 sclk = get_mmc_clk(host->dev_index); 108 div = DIV_ROUND_UP(sclk, freq); 109 /* set the clock divisor for mmc */ 110 set_mmc_clk(host->dev_index, div); 111 112 host->name = "EXYNOS DWMMC"; 113 #ifdef CONFIG_EXYNOS5420 114 host->quirks = DWMCI_QUIRK_DISABLE_SMU; 115 #endif 116 host->board_init = exynos_dwmci_board_init; 117 118 host->caps = MMC_MODE_DDR_52MHz; 119 host->clksel = exynos_dwmci_clksel; 120 host->get_mmc_clk = exynos_dwmci_get_clk; 121 122 #ifndef CONFIG_DM_MMC 123 /* Add the mmc channel to be registered with mmc core */ 124 if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) { 125 printf("DWMMC%d registration failed\n", host->dev_index); 126 return -1; 127 } 128 #endif 129 130 return 0; 131 } 132 133 static struct dwmci_host dwmci_host[DWMMC_MAX_CH_NUM]; 134 135 static int do_dwmci_init(struct dwmci_host *host) 136 { 137 int flag, err; 138 139 flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE; 140 err = exynos_pinmux_config(host->dev_id, flag); 141 if (err) { 142 printf("DWMMC%d not configure\n", host->dev_index); 143 return err; 144 } 145 146 return exynos_dwmci_core_init(host); 147 } 148 149 static int exynos_dwmci_get_config(const void *blob, int node, 150 struct dwmci_host *host) 151 { 152 int err = 0; 153 u32 base, timing[3]; 154 struct dwmci_exynos_priv_data *priv; 155 156 priv = malloc(sizeof(struct dwmci_exynos_priv_data)); 157 if (!priv) { 158 pr_err("dwmci_exynos_priv_data malloc fail!\n"); 159 return -ENOMEM; 160 } 161 162 /* Extract device id for each mmc channel */ 163 host->dev_id = pinmux_decode_periph_id(blob, node); 164 165 host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id); 166 if (host->dev_index == host->dev_id) 167 host->dev_index = host->dev_id - PERIPH_ID_SDMMC0; 168 169 if (host->dev_index > 4) { 170 printf("DWMMC%d: Can't get the dev index\n", host->dev_index); 171 free(priv); 172 return -EINVAL; 173 } 174 175 /* Get the bus width from the device node (Default is 4bit buswidth) */ 176 host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4); 177 178 /* Set the base address from the device node */ 179 base = fdtdec_get_addr(blob, node, "reg"); 180 if (!base) { 181 printf("DWMMC%d: Can't get base address\n", host->dev_index); 182 free(priv); 183 return -EINVAL; 184 } 185 host->ioaddr = (void *)base; 186 187 /* Extract the timing info from the node */ 188 err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3); 189 if (err) { 190 printf("DWMMC%d: Can't get sdr-timings for devider\n", 191 host->dev_index); 192 free(priv); 193 return -EINVAL; 194 } 195 196 priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) | 197 DWMCI_SET_DRV_CLK(timing[1]) | 198 DWMCI_SET_DIV_RATIO(timing[2])); 199 200 /* sdr_timing didn't assigned anything, use the default value */ 201 if (!priv->sdr_timing) { 202 if (host->dev_index == 0) 203 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL; 204 else if (host->dev_index == 2) 205 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL; 206 } 207 208 host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0); 209 host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0); 210 host->div = fdtdec_get_int(blob, node, "div", 0); 211 212 host->priv = priv; 213 214 return 0; 215 } 216 217 static int exynos_dwmci_process_node(const void *blob, 218 int node_list[], int count) 219 { 220 struct dwmci_host *host; 221 int i, node, err; 222 223 for (i = 0; i < count; i++) { 224 node = node_list[i]; 225 if (node <= 0) 226 continue; 227 host = &dwmci_host[i]; 228 err = exynos_dwmci_get_config(blob, node, host); 229 if (err) { 230 printf("%s: failed to decode dev %d\n", __func__, i); 231 return err; 232 } 233 234 do_dwmci_init(host); 235 } 236 return 0; 237 } 238 239 int exynos_dwmmc_init(const void *blob) 240 { 241 int node_list[DWMMC_MAX_CH_NUM]; 242 int boot_dev_node; 243 int err = 0, count; 244 245 count = fdtdec_find_aliases_for_id(blob, "mmc", 246 COMPAT_SAMSUNG_EXYNOS_DWMMC, node_list, 247 DWMMC_MAX_CH_NUM); 248 249 /* For DWMMC always set boot device as mmc 0 */ 250 if (count >= 3 && get_boot_mode() == BOOT_MODE_SD) { 251 boot_dev_node = node_list[2]; 252 node_list[2] = node_list[0]; 253 node_list[0] = boot_dev_node; 254 } 255 256 err = exynos_dwmci_process_node(blob, node_list, count); 257 258 return err; 259 } 260 261 #ifdef CONFIG_DM_MMC 262 static int exynos_dwmmc_probe(struct udevice *dev) 263 { 264 struct exynos_mmc_plat *plat = dev_get_platdata(dev); 265 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); 266 struct dwmci_exynos_priv_data *priv = dev_get_priv(dev); 267 struct dwmci_host *host = &priv->host; 268 int err; 269 270 err = exynos_dwmci_get_config(gd->fdt_blob, dev_of_offset(dev), host); 271 if (err) 272 return err; 273 err = do_dwmci_init(host); 274 if (err) 275 return err; 276 277 dwmci_setup_cfg(&plat->cfg, host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ); 278 host->mmc = &plat->mmc; 279 host->mmc->priv = &priv->host; 280 host->priv = dev; 281 upriv->mmc = host->mmc; 282 283 return dwmci_probe(dev); 284 } 285 286 static int exynos_dwmmc_bind(struct udevice *dev) 287 { 288 struct exynos_mmc_plat *plat = dev_get_platdata(dev); 289 290 return dwmci_bind(dev, &plat->mmc, &plat->cfg); 291 } 292 293 static const struct udevice_id exynos_dwmmc_ids[] = { 294 { .compatible = "samsung,exynos4412-dw-mshc" }, 295 { } 296 }; 297 298 U_BOOT_DRIVER(exynos_dwmmc_drv) = { 299 .name = "exynos_dwmmc", 300 .id = UCLASS_MMC, 301 .of_match = exynos_dwmmc_ids, 302 .bind = exynos_dwmmc_bind, 303 .ops = &dm_dwmci_ops, 304 .probe = exynos_dwmmc_probe, 305 .priv_auto_alloc_size = sizeof(struct dwmci_exynos_priv_data), 306 .platdata_auto_alloc_size = sizeof(struct exynos_mmc_plat), 307 }; 308 #endif 309