2 * (C) Copyright 2012 SAMSUNG Electronics
3 * Jaehoon Chung <jh80.chung@samsung.com>
5 * SPDX-License-Identifier: GPL-2.0+
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 <asm-generic/errno.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 void exynos_dwmci_clksel(struct dwmci_host *host)
50 struct dwmci_exynos_priv_data *priv = host->priv;
52 dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
55 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
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)
66 clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
67 & DWMCI_DIVRATIO_MASK) + 1;
68 sclk = get_mmc_clk(host->dev_index);
71 * Assume to know divider value.
72 * When clock unit is broken, need to set "host->div"
74 return sclk / clk_div / (host->div + 1);
77 static void exynos_dwmci_board_init(struct dwmci_host *host)
79 struct dwmci_exynos_priv_data *priv = host->priv;
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);
91 /* Set to timing value at initial time */
93 exynos_dwmci_clksel(host);
96 static int exynos_dwmci_core_init(struct dwmci_host *host)
99 unsigned long freq, sclk;
104 freq = DWMMC_MAX_FREQ;
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);
112 host->name = "EXYNOS DWMMC";
113 #ifdef CONFIG_EXYNOS5420
114 host->quirks = DWMCI_QUIRK_DISABLE_SMU;
116 host->board_init = exynos_dwmci_board_init;
118 host->caps = MMC_MODE_DDR_52MHz;
119 host->clksel = exynos_dwmci_clksel;
120 host->get_mmc_clk = exynos_dwmci_get_clk;
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);
133 static struct dwmci_host dwmci_host[DWMMC_MAX_CH_NUM];
135 static int do_dwmci_init(struct dwmci_host *host)
139 flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
140 err = exynos_pinmux_config(host->dev_id, flag);
142 printf("DWMMC%d not configure\n", host->dev_index);
146 return exynos_dwmci_core_init(host);
149 static int exynos_dwmci_get_config(const void *blob, int node,
150 struct dwmci_host *host)
154 struct dwmci_exynos_priv_data *priv;
156 priv = malloc(sizeof(struct dwmci_exynos_priv_data));
158 error("dwmci_exynos_priv_data malloc fail!\n");
162 /* Extract device id for each mmc channel */
163 host->dev_id = pinmux_decode_periph_id(blob, node);
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;
169 if (host->dev_index > 4) {
170 printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
174 /* Get the bus width from the device node (Default is 4bit buswidth) */
175 host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4);
177 /* Set the base address from the device node */
178 base = fdtdec_get_addr(blob, node, "reg");
180 printf("DWMMC%d: Can't get base address\n", host->dev_index);
183 host->ioaddr = (void *)base;
185 /* Extract the timing info from the node */
186 err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
188 printf("DWMMC%d: Can't get sdr-timings for devider\n",
193 priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
194 DWMCI_SET_DRV_CLK(timing[1]) |
195 DWMCI_SET_DIV_RATIO(timing[2]));
197 /* sdr_timing didn't assigned anything, use the default value */
198 if (!priv->sdr_timing) {
199 if (host->dev_index == 0)
200 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
201 else if (host->dev_index == 2)
202 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
205 host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
206 host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
207 host->div = fdtdec_get_int(blob, node, "div", 0);
214 static int exynos_dwmci_process_node(const void *blob,
215 int node_list[], int count)
217 struct dwmci_host *host;
220 for (i = 0; i < count; i++) {
224 host = &dwmci_host[i];
225 err = exynos_dwmci_get_config(blob, node, host);
227 printf("%s: failed to decode dev %d\n", __func__, i);
236 int exynos_dwmmc_init(const void *blob)
238 int node_list[DWMMC_MAX_CH_NUM];
242 count = fdtdec_find_aliases_for_id(blob, "mmc",
243 COMPAT_SAMSUNG_EXYNOS_DWMMC, node_list,
246 /* For DWMMC always set boot device as mmc 0 */
247 if (count >= 3 && get_boot_mode() == BOOT_MODE_SD) {
248 boot_dev_node = node_list[2];
249 node_list[2] = node_list[0];
250 node_list[0] = boot_dev_node;
253 err = exynos_dwmci_process_node(blob, node_list, count);
259 static int exynos_dwmmc_probe(struct udevice *dev)
261 struct exynos_mmc_plat *plat = dev_get_platdata(dev);
262 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
263 struct dwmci_exynos_priv_data *priv = dev_get_priv(dev);
264 struct dwmci_host *host = &priv->host;
267 err = exynos_dwmci_get_config(gd->fdt_blob, dev->of_offset, host);
270 err = do_dwmci_init(host);
274 dwmci_setup_cfg(&plat->cfg, host->name, host->buswidth, host->caps,
275 DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
276 host->mmc = &plat->mmc;
277 host->mmc->priv = &priv->host;
279 upriv->mmc = host->mmc;
281 return dwmci_probe(dev);
284 static int exynos_dwmmc_bind(struct udevice *dev)
286 struct exynos_mmc_plat *plat = dev_get_platdata(dev);
289 ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
296 static const struct udevice_id exynos_dwmmc_ids[] = {
297 { .compatible = "samsung,exynos4412-dw-mshc" },
301 U_BOOT_DRIVER(exynos_dwmmc_drv) = {
302 .name = "exynos_dwmmc",
304 .of_match = exynos_dwmmc_ids,
305 .bind = exynos_dwmmc_bind,
306 .ops = &dm_dwmci_ops,
307 .probe = exynos_dwmmc_probe,
308 .priv_auto_alloc_size = sizeof(struct dwmci_exynos_priv_data),
309 .platdata_auto_alloc_size = sizeof(struct exynos_mmc_plat),