1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2012 SAMSUNG Electronics
9 #include <asm/global_data.h>
10 #include <linux/libfdt.h>
13 #include <asm/arch/dwmmc.h>
14 #include <asm/arch/clk.h>
15 #include <asm/arch/pinmux.h>
16 #include <asm/arch/power.h>
18 #include <linux/printk.h>
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
28 DECLARE_GLOBAL_DATA_PTR;
30 struct exynos_mmc_plat {
31 struct mmc_config cfg;
36 /* Exynos implmentation specific drver private data */
37 struct dwmci_exynos_priv_data {
39 struct dwmci_host host;
45 * Function used as callback function to initialise the
46 * CLKSEL register for every mmc channel.
48 static int exynos_dwmci_clksel(struct dwmci_host *host)
51 struct dwmci_exynos_priv_data *priv =
52 container_of(host, struct dwmci_exynos_priv_data, host);
54 struct dwmci_exynos_priv_data *priv = host->priv;
56 dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
61 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
67 * Since SDCLKIN is divided inside controller by the DIVRATIO
68 * value set in the CLKSEL register, we need to use the same output
69 * clock value to calculate the CLKDIV value.
70 * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
72 clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
73 & DWMCI_DIVRATIO_MASK) + 1;
74 sclk = get_mmc_clk(host->dev_index);
77 * Assume to know divider value.
78 * When clock unit is broken, need to set "host->div"
80 return sclk / clk_div / (host->div + 1);
83 static void exynos_dwmci_board_init(struct dwmci_host *host)
85 struct dwmci_exynos_priv_data *priv = host->priv;
87 if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
88 dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
89 dwmci_writel(host, EMMCP_SEND0, 0);
90 dwmci_writel(host, EMMCP_CTRL0,
91 MPSCTRL_SECURE_READ_BIT |
92 MPSCTRL_SECURE_WRITE_BIT |
93 MPSCTRL_NON_SECURE_READ_BIT |
94 MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID);
97 /* Set to timing value at initial time */
99 exynos_dwmci_clksel(host);
102 static int exynos_dwmci_core_init(struct dwmci_host *host)
105 unsigned long freq, sclk;
110 freq = DWMMC_MAX_FREQ;
112 /* request mmc clock vlaue of 52MHz. */
113 sclk = get_mmc_clk(host->dev_index);
114 div = DIV_ROUND_UP(sclk, freq);
115 /* set the clock divisor for mmc */
116 set_mmc_clk(host->dev_index, div);
118 host->name = "EXYNOS DWMMC";
119 #ifdef CONFIG_EXYNOS5420
120 host->quirks = DWMCI_QUIRK_DISABLE_SMU;
122 host->board_init = exynos_dwmci_board_init;
124 host->caps = MMC_MODE_DDR_52MHz;
125 host->clksel = exynos_dwmci_clksel;
126 host->get_mmc_clk = exynos_dwmci_get_clk;
128 #ifndef CONFIG_DM_MMC
129 /* Add the mmc channel to be registered with mmc core */
130 if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
131 printf("DWMMC%d registration failed\n", host->dev_index);
139 static int do_dwmci_init(struct dwmci_host *host)
143 flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
144 err = exynos_pinmux_config(host->dev_id, flag);
146 printf("DWMMC%d not configure\n", host->dev_index);
150 return exynos_dwmci_core_init(host);
153 static int exynos_dwmci_get_config(const void *blob, int node,
154 struct dwmci_host *host,
155 struct dwmci_exynos_priv_data *priv)
160 /* Extract device id for each mmc channel */
161 host->dev_id = pinmux_decode_periph_id(blob, node);
163 host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id);
164 if (host->dev_index == host->dev_id)
165 host->dev_index = host->dev_id - PERIPH_ID_SDMMC0;
167 if (host->dev_index > 4) {
168 printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
172 /* Get the bus width from the device node (Default is 4bit buswidth) */
173 host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4);
175 /* Set the base address from the device node */
176 base = fdtdec_get_addr(blob, node, "reg");
178 printf("DWMMC%d: Can't get base address\n", host->dev_index);
181 host->ioaddr = (void *)base;
183 /* Extract the timing info from the node */
184 err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
186 printf("DWMMC%d: Can't get sdr-timings for devider\n",
191 priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
192 DWMCI_SET_DRV_CLK(timing[1]) |
193 DWMCI_SET_DIV_RATIO(timing[2]));
195 /* sdr_timing didn't assigned anything, use the default value */
196 if (!priv->sdr_timing) {
197 if (host->dev_index == 0)
198 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
199 else if (host->dev_index == 2)
200 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
203 host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
204 host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
205 host->div = fdtdec_get_int(blob, node, "div", 0);
211 static int exynos_dwmmc_probe(struct udevice *dev)
213 struct exynos_mmc_plat *plat = dev_get_plat(dev);
214 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
215 struct dwmci_exynos_priv_data *priv = dev_get_priv(dev);
216 struct dwmci_host *host = &priv->host;
219 err = exynos_dwmci_get_config(gd->fdt_blob, dev_of_offset(dev), host,
223 err = do_dwmci_init(host);
227 dwmci_setup_cfg(&plat->cfg, host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
228 host->mmc = &plat->mmc;
229 host->mmc->priv = &priv->host;
231 upriv->mmc = host->mmc;
233 return dwmci_probe(dev);
236 static int exynos_dwmmc_bind(struct udevice *dev)
238 struct exynos_mmc_plat *plat = dev_get_plat(dev);
240 return dwmci_bind(dev, &plat->mmc, &plat->cfg);
243 static const struct udevice_id exynos_dwmmc_ids[] = {
244 { .compatible = "samsung,exynos4412-dw-mshc" },
245 { .compatible = "samsung,exynos-dwmmc" },
249 U_BOOT_DRIVER(exynos_dwmmc_drv) = {
250 .name = "exynos_dwmmc",
252 .of_match = exynos_dwmmc_ids,
253 .bind = exynos_dwmmc_bind,
254 .ops = &dm_dwmci_ops,
255 .probe = exynos_dwmmc_probe,
256 .priv_auto = sizeof(struct dwmci_exynos_priv_data),
257 .plat_auto = sizeof(struct exynos_mmc_plat),