1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2012 SAMSUNG Electronics
4 * Jaehoon Chung <jh80.chung@samsung.com>
13 #include <linux/libfdt.h>
15 #include <asm/arch/mmc.h>
16 #include <asm/arch/clk.h>
18 #include <asm/arch/pinmux.h>
21 struct s5p_sdhci_plat {
22 struct mmc_config cfg;
26 DECLARE_GLOBAL_DATA_PTR;
29 static char *S5P_NAME = "SAMSUNG SDHCI";
30 static void s5p_sdhci_set_control_reg(struct sdhci_host *host)
32 unsigned long val, ctrl;
40 sdhci_writel(host, SDHCI_CTRL4_DRIVE_MASK(0x3), SDHCI_CONTROL4);
42 val = sdhci_readl(host, SDHCI_CONTROL2);
43 val &= SDHCI_CTRL2_SELBASECLK_MASK(3);
45 val |= SDHCI_CTRL2_ENSTAASYNCCLR |
46 SDHCI_CTRL2_ENCMDCNFMSK |
47 SDHCI_CTRL2_ENFBCLKRX |
48 SDHCI_CTRL2_ENCLKOUTHOLD;
50 sdhci_writel(host, val, SDHCI_CONTROL2);
53 * FCSEL3[31] FCSEL2[23] FCSEL1[15] FCSEL0[7]
54 * FCSel[1:0] : Rx Feedback Clock Delay Control
55 * Inverter delay means10ns delay if SDCLK 50MHz setting
56 * 01 = Delay1 (basic delay)
57 * 11 = Delay2 (basic delay + 2ns)
58 * 00 = Delay3 (inverter delay)
59 * 10 = Delay4 (inverter delay + 2ns)
61 val = SDHCI_CTRL3_FCSEL0 | SDHCI_CTRL3_FCSEL1;
62 sdhci_writel(host, val, SDHCI_CONTROL3);
70 ctrl = sdhci_readl(host, SDHCI_CONTROL2);
71 ctrl &= ~SDHCI_CTRL2_SELBASECLK_MASK(0x3);
72 ctrl |= SDHCI_CTRL2_SELBASECLK_MASK(0x2);
73 sdhci_writel(host, ctrl, SDHCI_CONTROL2);
76 static void s5p_set_clock(struct sdhci_host *host, u32 div)
78 /* ToDo : Use the Clock Framework */
79 set_mmc_clk(host->index, div);
82 static const struct sdhci_ops s5p_sdhci_ops = {
83 .set_clock = &s5p_set_clock,
84 .set_control_reg = &s5p_sdhci_set_control_reg,
87 static int s5p_sdhci_core_init(struct sdhci_host *host)
89 host->name = S5P_NAME;
91 host->quirks = SDHCI_QUIRK_NO_HISPD_BIT | SDHCI_QUIRK_BROKEN_VOLTAGE |
92 SDHCI_QUIRK_32BIT_DMA_ADDR |
93 SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_USE_WIDE8;
94 host->max_clk = 52000000;
95 host->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
96 host->ops = &s5p_sdhci_ops;
98 if (host->bus_width == 8)
99 host->host_caps |= MMC_MODE_8BIT;
102 return add_sdhci(host, 0, 400000);
108 int s5p_sdhci_init(u32 regbase, int index, int bus_width)
110 struct sdhci_host *host = calloc(1, sizeof(struct sdhci_host));
112 printf("sdhci__host allocation fail!\n");
115 host->ioaddr = (void *)regbase;
117 host->bus_width = bus_width;
119 return s5p_sdhci_core_init(host);
122 static int do_sdhci_init(struct sdhci_host *host)
124 int dev_id, flag, ret;
126 flag = host->bus_width == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
127 dev_id = host->index + PERIPH_ID_SDMMC0;
129 ret = exynos_pinmux_config(dev_id, flag);
131 printf("external SD not configured\n");
135 if (dm_gpio_is_valid(&host->pwr_gpio)) {
136 dm_gpio_set_value(&host->pwr_gpio, 1);
137 ret = exynos_pinmux_config(dev_id, flag);
139 debug("MMC not configured\n");
144 if (dm_gpio_is_valid(&host->cd_gpio)) {
145 ret = dm_gpio_get_value(&host->cd_gpio);
147 debug("no SD card detected (%d)\n", ret);
152 return s5p_sdhci_core_init(host);
155 static int sdhci_get_config(const void *blob, int node, struct sdhci_host *host)
157 int bus_width, dev_id;
161 dev_id = pinmux_decode_periph_id(blob, node);
162 if (dev_id < PERIPH_ID_SDMMC0 || dev_id > PERIPH_ID_SDMMC3) {
163 debug("MMC: Can't get device id\n");
166 host->index = dev_id - PERIPH_ID_SDMMC0;
169 bus_width = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
170 if (bus_width <= 0) {
171 debug("MMC: Can't get bus-width\n");
174 host->bus_width = bus_width;
176 /* Get the base address from the device node */
177 base = fdtdec_get_addr(blob, node, "reg");
179 debug("MMC: Can't get base address\n");
182 host->ioaddr = (void *)base;
184 gpio_request_by_name_nodev(offset_to_ofnode(node), "pwr-gpios", 0,
185 &host->pwr_gpio, GPIOD_IS_OUT);
186 gpio_request_by_name_nodev(offset_to_ofnode(node), "cd-gpios", 0,
187 &host->cd_gpio, GPIOD_IS_IN);
193 static int s5p_sdhci_probe(struct udevice *dev)
195 struct s5p_sdhci_plat *plat = dev_get_platdata(dev);
196 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
197 struct sdhci_host *host = dev_get_priv(dev);
200 ret = sdhci_get_config(gd->fdt_blob, dev_of_offset(dev), host);
204 ret = do_sdhci_init(host);
208 ret = mmc_of_parse(dev, &plat->cfg);
212 host->mmc = &plat->mmc;
213 host->mmc->dev = dev;
215 ret = sdhci_setup_cfg(&plat->cfg, host, 0, 400000);
219 host->mmc->priv = host;
220 upriv->mmc = host->mmc;
222 return sdhci_probe(dev);
225 static int s5p_sdhci_bind(struct udevice *dev)
227 struct s5p_sdhci_plat *plat = dev_get_platdata(dev);
230 ret = sdhci_bind(dev, &plat->mmc, &plat->cfg);
237 static const struct udevice_id s5p_sdhci_ids[] = {
238 { .compatible = "samsung,exynos4412-sdhci"},
242 U_BOOT_DRIVER(s5p_sdhci_drv) = {
245 .of_match = s5p_sdhci_ids,
246 .bind = s5p_sdhci_bind,
248 .probe = s5p_sdhci_probe,
249 .priv_auto_alloc_size = sizeof(struct sdhci_host),
250 .platdata_auto_alloc_size = sizeof(struct s5p_sdhci_plat),
252 #endif /* CONFIG_DM_MMC */