2 * (C) Copyright 2012 SAMSUNG Electronics
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
26 /* Exynos implmentation specific drver private data */
27 struct dwmci_exynos_priv_data {
32 * Function used as callback function to initialise the
33 * CLKSEL register for every mmc channel.
35 static void exynos_dwmci_clksel(struct dwmci_host *host)
37 struct dwmci_exynos_priv_data *priv = host->priv;
39 dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
42 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
48 * Since SDCLKIN is divided inside controller by the DIVRATIO
49 * value set in the CLKSEL register, we need to use the same output
50 * clock value to calculate the CLKDIV value.
51 * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
53 clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
54 & DWMCI_DIVRATIO_MASK) + 1;
55 sclk = get_mmc_clk(host->dev_index);
58 * Assume to know divider value.
59 * When clock unit is broken, need to set "host->div"
61 return sclk / clk_div / (host->div + 1);
64 static void exynos_dwmci_board_init(struct dwmci_host *host)
66 struct dwmci_exynos_priv_data *priv = host->priv;
68 if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
69 dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
70 dwmci_writel(host, EMMCP_SEND0, 0);
71 dwmci_writel(host, EMMCP_CTRL0,
72 MPSCTRL_SECURE_READ_BIT |
73 MPSCTRL_SECURE_WRITE_BIT |
74 MPSCTRL_NON_SECURE_READ_BIT |
75 MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID);
78 /* Set to timing value at initial time */
80 exynos_dwmci_clksel(host);
83 static int exynos_dwmci_core_init(struct dwmci_host *host)
86 unsigned long freq, sclk;
91 freq = DWMMC_MAX_FREQ;
93 /* request mmc clock vlaue of 52MHz. */
94 sclk = get_mmc_clk(host->dev_index);
95 div = DIV_ROUND_UP(sclk, freq);
96 /* set the clock divisor for mmc */
97 set_mmc_clk(host->dev_index, div);
99 host->name = "EXYNOS DWMMC";
100 #ifdef CONFIG_EXYNOS5420
101 host->quirks = DWMCI_QUIRK_DISABLE_SMU;
103 host->board_init = exynos_dwmci_board_init;
105 host->caps = MMC_MODE_DDR_52MHz;
106 host->clksel = exynos_dwmci_clksel;
107 host->get_mmc_clk = exynos_dwmci_get_clk;
108 /* Add the mmc channel to be registered with mmc core */
109 if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
110 printf("DWMMC%d registration failed\n", host->dev_index);
116 static struct dwmci_host dwmci_host[DWMMC_MAX_CH_NUM];
118 static int do_dwmci_init(struct dwmci_host *host)
122 flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
123 err = exynos_pinmux_config(host->dev_id, flag);
125 printf("DWMMC%d not configure\n", host->dev_index);
129 return exynos_dwmci_core_init(host);
132 static int exynos_dwmci_get_config(const void *blob, int node,
133 struct dwmci_host *host)
137 struct dwmci_exynos_priv_data *priv;
139 priv = malloc(sizeof(struct dwmci_exynos_priv_data));
141 error("dwmci_exynos_priv_data malloc fail!\n");
145 /* Extract device id for each mmc channel */
146 host->dev_id = pinmux_decode_periph_id(blob, node);
148 host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id);
149 if (host->dev_index == host->dev_id)
150 host->dev_index = host->dev_id - PERIPH_ID_SDMMC0;
152 if (host->dev_index > 4) {
153 printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
157 /* Get the bus width from the device node */
158 host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
159 if (host->buswidth <= 0) {
160 printf("DWMMC%d: Can't get bus-width\n", host->dev_index);
164 /* Set the base address from the device node */
165 base = fdtdec_get_addr(blob, node, "reg");
167 printf("DWMMC%d: Can't get base address\n", host->dev_index);
170 host->ioaddr = (void *)base;
172 /* Extract the timing info from the node */
173 err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
175 printf("DWMMC%d: Can't get sdr-timings for devider\n",
180 priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
181 DWMCI_SET_DRV_CLK(timing[1]) |
182 DWMCI_SET_DIV_RATIO(timing[2]));
184 /* sdr_timing didn't assigned anything, use the default value */
185 if (!priv->sdr_timing) {
186 if (host->dev_index == 0)
187 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
188 else if (host->dev_index == 2)
189 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
192 host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
193 host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
194 host->div = fdtdec_get_int(blob, node, "div", 0);
201 static int exynos_dwmci_process_node(const void *blob,
202 int node_list[], int count)
204 struct dwmci_host *host;
207 for (i = 0; i < count; i++) {
211 host = &dwmci_host[i];
212 err = exynos_dwmci_get_config(blob, node, host);
214 printf("%s: failed to decode dev %d\n", __func__, i);
223 int exynos_dwmmc_init(const void *blob)
225 int node_list[DWMMC_MAX_CH_NUM];
229 count = fdtdec_find_aliases_for_id(blob, "mmc",
230 COMPAT_SAMSUNG_EXYNOS_DWMMC, node_list,
233 /* For DWMMC always set boot device as mmc 0 */
234 if (count >= 3 && get_boot_mode() == BOOT_MODE_SD) {
235 boot_dev_node = node_list[2];
236 node_list[2] = node_list[0];
237 node_list[0] = boot_dev_node;
240 err = exynos_dwmci_process_node(blob, node_list, count);