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 <malloc.h> 10 #include <sdhci.h> 11 #include <fdtdec.h> 12 #include <libfdt.h> 13 #include <asm/gpio.h> 14 #include <asm/arch/mmc.h> 15 #include <asm/arch/clk.h> 16 #include <errno.h> 17 #ifdef CONFIG_OF_CONTROL 18 #include <asm/arch/pinmux.h> 19 #endif 20 21 static char *S5P_NAME = "SAMSUNG SDHCI"; 22 static void s5p_sdhci_set_control_reg(struct sdhci_host *host) 23 { 24 unsigned long val, ctrl; 25 /* 26 * SELCLKPADDS[17:16] 27 * 00 = 2mA 28 * 01 = 4mA 29 * 10 = 7mA 30 * 11 = 9mA 31 */ 32 sdhci_writel(host, SDHCI_CTRL4_DRIVE_MASK(0x3), SDHCI_CONTROL4); 33 34 val = sdhci_readl(host, SDHCI_CONTROL2); 35 val &= SDHCI_CTRL2_SELBASECLK_SHIFT; 36 37 val |= SDHCI_CTRL2_ENSTAASYNCCLR | 38 SDHCI_CTRL2_ENCMDCNFMSK | 39 SDHCI_CTRL2_ENFBCLKRX | 40 SDHCI_CTRL2_ENCLKOUTHOLD; 41 42 sdhci_writel(host, val, SDHCI_CONTROL2); 43 44 /* 45 * FCSEL3[31] FCSEL2[23] FCSEL1[15] FCSEL0[7] 46 * FCSel[1:0] : Rx Feedback Clock Delay Control 47 * Inverter delay means10ns delay if SDCLK 50MHz setting 48 * 01 = Delay1 (basic delay) 49 * 11 = Delay2 (basic delay + 2ns) 50 * 00 = Delay3 (inverter delay) 51 * 10 = Delay4 (inverter delay + 2ns) 52 */ 53 val = SDHCI_CTRL3_FCSEL0 | SDHCI_CTRL3_FCSEL1; 54 sdhci_writel(host, val, SDHCI_CONTROL3); 55 56 /* 57 * SELBASECLK[5:4] 58 * 00/01 = HCLK 59 * 10 = EPLL 60 * 11 = XTI or XEXTCLK 61 */ 62 ctrl = sdhci_readl(host, SDHCI_CONTROL2); 63 ctrl &= ~SDHCI_CTRL2_SELBASECLK_MASK(0x3); 64 ctrl |= SDHCI_CTRL2_SELBASECLK_MASK(0x2); 65 sdhci_writel(host, ctrl, SDHCI_CONTROL2); 66 } 67 68 static int s5p_sdhci_core_init(struct sdhci_host *host) 69 { 70 host->name = S5P_NAME; 71 72 host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_VOLTAGE | 73 SDHCI_QUIRK_BROKEN_R1B | SDHCI_QUIRK_32BIT_DMA_ADDR | 74 SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_USE_WIDE8; 75 host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195; 76 host->version = sdhci_readw(host, SDHCI_HOST_VERSION); 77 78 host->set_control_reg = &s5p_sdhci_set_control_reg; 79 host->set_clock = set_mmc_clk; 80 81 host->host_caps = MMC_MODE_HC; 82 if (host->bus_width == 8) 83 host->host_caps |= MMC_MODE_8BIT; 84 85 return add_sdhci(host, 52000000, 400000); 86 } 87 88 int s5p_sdhci_init(u32 regbase, int index, int bus_width) 89 { 90 struct sdhci_host *host = malloc(sizeof(struct sdhci_host)); 91 if (!host) { 92 printf("sdhci__host malloc fail!\n"); 93 return 1; 94 } 95 host->ioaddr = (void *)regbase; 96 host->index = index; 97 host->bus_width = bus_width; 98 99 return s5p_sdhci_core_init(host); 100 } 101 102 #ifdef CONFIG_OF_CONTROL 103 struct sdhci_host sdhci_host[SDHCI_MAX_HOSTS]; 104 105 static int do_sdhci_init(struct sdhci_host *host) 106 { 107 int dev_id, flag; 108 int err = 0; 109 110 flag = host->bus_width == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE; 111 dev_id = host->index + PERIPH_ID_SDMMC0; 112 113 if (fdt_gpio_isvalid(&host->pwr_gpio)) { 114 gpio_direction_output(host->pwr_gpio.gpio, 1); 115 err = exynos_pinmux_config(dev_id, flag); 116 if (err) { 117 debug("MMC not configured\n"); 118 return err; 119 } 120 } 121 122 if (fdt_gpio_isvalid(&host->cd_gpio)) { 123 gpio_direction_output(host->cd_gpio.gpio, 0xf); 124 if (gpio_get_value(host->cd_gpio.gpio)) 125 return -ENODEV; 126 127 err = exynos_pinmux_config(dev_id, flag); 128 if (err) { 129 printf("external SD not configured\n"); 130 return err; 131 } 132 } 133 134 return s5p_sdhci_core_init(host); 135 } 136 137 static int sdhci_get_config(const void *blob, int node, struct sdhci_host *host) 138 { 139 int bus_width, dev_id; 140 unsigned int base; 141 142 /* Get device id */ 143 dev_id = pinmux_decode_periph_id(blob, node); 144 if (dev_id < PERIPH_ID_SDMMC0 && dev_id > PERIPH_ID_SDMMC3) { 145 debug("MMC: Can't get device id\n"); 146 return -1; 147 } 148 host->index = dev_id - PERIPH_ID_SDMMC0; 149 150 /* Get bus width */ 151 bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0); 152 if (bus_width <= 0) { 153 debug("MMC: Can't get bus-width\n"); 154 return -1; 155 } 156 host->bus_width = bus_width; 157 158 /* Get the base address from the device node */ 159 base = fdtdec_get_addr(blob, node, "reg"); 160 if (!base) { 161 debug("MMC: Can't get base address\n"); 162 return -1; 163 } 164 host->ioaddr = (void *)base; 165 166 fdtdec_decode_gpio(blob, node, "pwr-gpios", &host->pwr_gpio); 167 fdtdec_decode_gpio(blob, node, "cd-gpios", &host->cd_gpio); 168 169 return 0; 170 } 171 172 static int process_nodes(const void *blob, int node_list[], int count) 173 { 174 struct sdhci_host *host; 175 int i, node; 176 177 debug("%s: count = %d\n", __func__, count); 178 179 /* build sdhci_host[] for each controller */ 180 for (i = 0; i < count; i++) { 181 node = node_list[i]; 182 if (node <= 0) 183 continue; 184 185 host = &sdhci_host[i]; 186 187 if (sdhci_get_config(blob, node, host)) { 188 printf("%s: failed to decode dev %d\n", __func__, i); 189 return -1; 190 } 191 do_sdhci_init(host); 192 } 193 return 0; 194 } 195 196 int exynos_mmc_init(const void *blob) 197 { 198 int count; 199 int node_list[SDHCI_MAX_HOSTS]; 200 201 count = fdtdec_find_aliases_for_id(blob, "mmc", 202 COMPAT_SAMSUNG_EXYNOS_MMC, node_list, 203 SDHCI_MAX_HOSTS); 204 205 process_nodes(blob, node_list, count); 206 207 return 1; 208 } 209 #endif 210