drivers/mmc/s5p_sdhci.c

   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 #include <asm/arch/pinmux.h>
  18
  19 static char *S5P_NAME = "SAMSUNG SDHCI";
  20 static void s5p_sdhci_set_control_reg(struct sdhci_host *host)
  21 {
  22         unsigned long val, ctrl;
  23         /*
  24          * SELCLKPADDS[17:16]
  25          * 00 = 2mA
  26          * 01 = 4mA
  27          * 10 = 7mA
  28          * 11 = 9mA
  29          */
  30         sdhci_writel(host, SDHCI_CTRL4_DRIVE_MASK(0x3), SDHCI_CONTROL4);
  31
  32         val = sdhci_readl(host, SDHCI_CONTROL2);
  33         val &= SDHCI_CTRL2_SELBASECLK_MASK(3);
  34
  35         val |=  SDHCI_CTRL2_ENSTAASYNCCLR |
  36                 SDHCI_CTRL2_ENCMDCNFMSK |
  37                 SDHCI_CTRL2_ENFBCLKRX |
  38                 SDHCI_CTRL2_ENCLKOUTHOLD;
  39
  40         sdhci_writel(host, val, SDHCI_CONTROL2);
  41
  42         /*
  43          * FCSEL3[31] FCSEL2[23] FCSEL1[15] FCSEL0[7]
  44          * FCSel[1:0] : Rx Feedback Clock Delay Control
  45          *      Inverter delay means10ns delay if SDCLK 50MHz setting
  46          *      01 = Delay1 (basic delay)
  47          *      11 = Delay2 (basic delay + 2ns)
  48          *      00 = Delay3 (inverter delay)
  49          *      10 = Delay4 (inverter delay + 2ns)
  50          */
  51         val = SDHCI_CTRL3_FCSEL0 | SDHCI_CTRL3_FCSEL1;
  52         sdhci_writel(host, val, SDHCI_CONTROL3);
  53
  54         /*
  55          * SELBASECLK[5:4]
  56          * 00/01 = HCLK
  57          * 10 = EPLL
  58          * 11 = XTI or XEXTCLK
  59          */
  60         ctrl = sdhci_readl(host, SDHCI_CONTROL2);
  61         ctrl &= ~SDHCI_CTRL2_SELBASECLK_MASK(0x3);
  62         ctrl |= SDHCI_CTRL2_SELBASECLK_MASK(0x2);
  63         sdhci_writel(host, ctrl, SDHCI_CONTROL2);
  64 }
  65
  66 static int s5p_sdhci_core_init(struct sdhci_host *host)
  67 {
  68         host->name = S5P_NAME;
  69
  70         host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_VOLTAGE |
  71                 SDHCI_QUIRK_32BIT_DMA_ADDR |
  72                 SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_USE_WIDE8;
  73         host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
  74         host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
  75
  76         host->set_control_reg = &s5p_sdhci_set_control_reg;
  77         host->set_clock = set_mmc_clk;
  78
  79         if (host->bus_width == 8)
  80                 host->host_caps |= MMC_MODE_8BIT;
  81
  82         return add_sdhci(host, 52000000, 400000);
  83 }
  84
  85 int s5p_sdhci_init(u32 regbase, int index, int bus_width)
  86 {
  87         struct sdhci_host *host = calloc(1, sizeof(struct sdhci_host));
  88         if (!host) {
  89                 printf("sdhci__host allocation fail!\n");
  90                 return 1;
  91         }
  92         host->ioaddr = (void *)regbase;
  93         host->index = index;
  94         host->bus_width = bus_width;
  95
  96         return s5p_sdhci_core_init(host);
  97 }
  98
  99 #if CONFIG_IS_ENABLED(OF_CONTROL)
 100 struct sdhci_host sdhci_host[SDHCI_MAX_HOSTS];
 101
 102 static int do_sdhci_init(struct sdhci_host *host)
 103 {
 104         int dev_id, flag, ret;
 105
 106         flag = host->bus_width == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
 107         dev_id = host->index + PERIPH_ID_SDMMC0;
 108
 109         ret = exynos_pinmux_config(dev_id, flag);
 110         if (ret) {
 111                 printf("external SD not configured\n");
 112                 return ret;
 113         }
 114
 115         if (dm_gpio_is_valid(&host->pwr_gpio)) {
 116                 dm_gpio_set_value(&host->pwr_gpio, 1);
 117                 ret = exynos_pinmux_config(dev_id, flag);
 118                 if (ret) {
 119                         debug("MMC not configured\n");
 120                         return ret;
 121                 }
 122         }
 123
 124         if (dm_gpio_is_valid(&host->cd_gpio)) {
 125                 ret = dm_gpio_get_value(&host->cd_gpio);
 126                 if (ret) {
 127                         debug("no SD card detected (%d)\n", ret);
 128                         return -ENODEV;
 129                 }
 130         }
 131
 132         return s5p_sdhci_core_init(host);
 133 }
 134
 135 static int sdhci_get_config(const void *blob, int node, struct sdhci_host *host)
 136 {
 137         int bus_width, dev_id;
 138         unsigned int base;
 139
 140         /* Get device id */
 141         dev_id = pinmux_decode_periph_id(blob, node);
 142         if (dev_id < PERIPH_ID_SDMMC0 && dev_id > PERIPH_ID_SDMMC3) {
 143                 debug("MMC: Can't get device id\n");
 144                 return -1;
 145         }
 146         host->index = dev_id - PERIPH_ID_SDMMC0;
 147
 148         /* Get bus width */
 149         bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
 150         if (bus_width <= 0) {
 151                 debug("MMC: Can't get bus-width\n");
 152                 return -1;
 153         }
 154         host->bus_width = bus_width;
 155
 156         /* Get the base address from the device node */
 157         base = fdtdec_get_addr(blob, node, "reg");
 158         if (!base) {
 159                 debug("MMC: Can't get base address\n");
 160                 return -1;
 161         }
 162         host->ioaddr = (void *)base;
 163
 164         gpio_request_by_name_nodev(blob, node, "pwr-gpios", 0, &host->pwr_gpio,
 165                                    GPIOD_IS_OUT);
 166         gpio_request_by_name_nodev(blob, node, "cd-gpios", 0, &host->cd_gpio,
 167                                    GPIOD_IS_IN);
 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, ret;
 176         int failed = 0;
 177
 178         debug("%s: count = %d\n", __func__, count);
 179
 180         /* build sdhci_host[] for each controller */
 181         for (i = 0; i < count; i++) {
 182                 node = node_list[i];
 183                 if (node <= 0)
 184                         continue;
 185
 186                 host = &sdhci_host[i];
 187
 188                 ret = sdhci_get_config(blob, node, host);
 189                 if (ret) {
 190                         printf("%s: failed to decode dev %d (%d)\n",    __func__, i, ret);
 191                         failed++;
 192                         continue;
 193                 }
 194
 195                 ret = do_sdhci_init(host);
 196                 if (ret && ret != -ENODEV) {
 197                         printf("%s: failed to initialize dev %d (%d)\n", __func__, i, ret);
 198                         failed++;
 199                 }
 200         }
 201
 202         /* we only consider it an error when all nodes fail */
 203         return (failed == count ? -1 : 0);
 204 }
 205
 206 int exynos_mmc_init(const void *blob)
 207 {
 208         int count;
 209         int node_list[SDHCI_MAX_HOSTS];
 210
 211         count = fdtdec_find_aliases_for_id(blob, "mmc",
 212                         COMPAT_SAMSUNG_EXYNOS_MMC, node_list,
 213                         SDHCI_MAX_HOSTS);
 214
 215         return process_nodes(blob, node_list, count);
 216 }
 217 #endif