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>
17 #include <asm-generic/errno.h>
19 #define DWMMC_MAX_CH_NUM 4
20 #define DWMMC_MAX_FREQ 52000000
21 #define DWMMC_MIN_FREQ 400000
22 #define DWMMC_MMC0_SDR_TIMING_VAL 0x03030001
23 #define DWMMC_MMC2_SDR_TIMING_VAL 0x03020001
25 /* Exynos implmentation specific drver private data */
26 struct dwmci_exynos_priv_data {
31 * Function used as callback function to initialise the
32 * CLKSEL register for every mmc channel.
34 static void exynos_dwmci_clksel(struct dwmci_host *host)
36 struct dwmci_exynos_priv_data *priv = host->priv;
38 dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
41 unsigned int exynos_dwmci_get_clk(struct dwmci_host *host)
47 * Since SDCLKIN is divided inside controller by the DIVRATIO
48 * value set in the CLKSEL register, we need to use the same output
49 * clock value to calculate the CLKDIV value.
50 * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1)
52 clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
53 & DWMCI_DIVRATIO_MASK) + 1;
54 sclk = get_mmc_clk(host->dev_index);
57 * Assume to know divider value.
58 * When clock unit is broken, need to set "host->div"
60 return sclk / clk_div / (host->div + 1);
63 static void exynos_dwmci_board_init(struct dwmci_host *host)
65 struct dwmci_exynos_priv_data *priv = host->priv;
67 if (host->quirks & DWMCI_QUIRK_DISABLE_SMU) {
68 dwmci_writel(host, EMMCP_MPSBEGIN0, 0);
69 dwmci_writel(host, EMMCP_SEND0, 0);
70 dwmci_writel(host, EMMCP_CTRL0,
71 MPSCTRL_SECURE_READ_BIT |
72 MPSCTRL_SECURE_WRITE_BIT |
73 MPSCTRL_NON_SECURE_READ_BIT |
74 MPSCTRL_NON_SECURE_WRITE_BIT | MPSCTRL_VALID);
77 /* Set to timing value at initial time */
79 exynos_dwmci_clksel(host);
82 static int exynos_dwmci_core_init(struct dwmci_host *host, int index)
85 unsigned long freq, sclk;
86 struct dwmci_exynos_priv_data *priv = host->priv;
91 freq = DWMMC_MAX_FREQ;
93 /* request mmc clock vlaue of 52MHz. */
94 sclk = get_mmc_clk(index);
95 div = DIV_ROUND_UP(sclk, freq);
96 /* set the clock divisor for mmc */
97 set_mmc_clk(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 if (!priv->sdr_timing) {
107 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
109 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
112 host->caps = MMC_MODE_DDR_52MHz;
113 host->clksel = exynos_dwmci_clksel;
114 host->dev_index = index;
115 host->get_mmc_clk = exynos_dwmci_get_clk;
116 /* Add the mmc channel to be registered with mmc core */
117 if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
118 printf("DWMMC%d registration failed\n", index);
125 * This function adds the mmc channel to be registered with mmc core.
126 * index - mmc channel number.
127 * regbase - register base address of mmc channel specified in 'index'.
128 * bus_width - operating bus width of mmc channel specified in 'index'.
129 * clksel - value to be written into CLKSEL register in case of FDT.
130 * NULL in case od non-FDT.
132 int exynos_dwmci_add_port(int index, u32 regbase, int bus_width, u32 clksel)
134 struct dwmci_host *host = NULL;
135 struct dwmci_exynos_priv_data *priv;
137 host = malloc(sizeof(struct dwmci_host));
139 error("dwmci_host malloc fail!\n");
143 priv = malloc(sizeof(struct dwmci_exynos_priv_data));
145 error("dwmci_exynos_priv_data malloc fail!\n");
149 host->ioaddr = (void *)regbase;
150 host->buswidth = bus_width;
153 priv->sdr_timing = clksel;
157 return exynos_dwmci_core_init(host, index);
160 #ifdef CONFIG_OF_CONTROL
161 static struct dwmci_host dwmci_host[DWMMC_MAX_CH_NUM];
163 static int do_dwmci_init(struct dwmci_host *host)
165 int index, flag, err;
167 index = host->dev_index;
169 flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
170 err = exynos_pinmux_config(host->dev_id, flag);
172 printf("DWMMC%d not configure\n", index);
176 return exynos_dwmci_core_init(host, index);
179 static int exynos_dwmci_get_config(const void *blob, int node,
180 struct dwmci_host *host)
184 struct dwmci_exynos_priv_data *priv;
186 priv = malloc(sizeof(struct dwmci_exynos_priv_data));
188 error("dwmci_exynos_priv_data malloc fail!\n");
192 /* Extract device id for each mmc channel */
193 host->dev_id = pinmux_decode_periph_id(blob, node);
195 host->dev_index = fdtdec_get_int(blob, node, "index", host->dev_id);
196 if (host->dev_index == host->dev_id)
197 host->dev_index = host->dev_id - PERIPH_ID_SDMMC0;
200 /* Get the bus width from the device node */
201 host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 0);
202 if (host->buswidth <= 0) {
203 printf("DWMMC%d: Can't get bus-width\n", host->dev_index);
207 /* Set the base address from the device node */
208 base = fdtdec_get_addr(blob, node, "reg");
210 printf("DWMMC%d: Can't get base address\n", host->dev_index);
213 host->ioaddr = (void *)base;
215 /* Extract the timing info from the node */
216 err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
218 printf("DWMMC%d: Can't get sdr-timings for devider\n",
223 priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
224 DWMCI_SET_DRV_CLK(timing[1]) |
225 DWMCI_SET_DIV_RATIO(timing[2]));
227 /* sdr_timing didn't assigned anything, use the default value */
228 if (!priv->sdr_timing) {
229 if (host->dev_index == 0)
230 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
231 else if (host->dev_index == 2)
232 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
235 host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
236 host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
237 host->div = fdtdec_get_int(blob, node, "div", 0);
244 static int exynos_dwmci_process_node(const void *blob,
245 int node_list[], int count)
247 struct dwmci_host *host;
250 for (i = 0; i < count; i++) {
254 host = &dwmci_host[i];
255 err = exynos_dwmci_get_config(blob, node, host);
257 printf("%s: failed to decode dev %d\n", __func__, i);
266 int exynos_dwmmc_init(const void *blob)
269 int node_list[DWMMC_MAX_CH_NUM];
272 compat_id = COMPAT_SAMSUNG_EXYNOS_DWMMC;
274 count = fdtdec_find_aliases_for_id(blob, "mmc",
275 compat_id, node_list, DWMMC_MAX_CH_NUM);
276 err = exynos_dwmci_process_node(blob, node_list, count);