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[people/ms/u-boot.git] / drivers / mmc / exynos_dw_mmc.c
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1/*
2 * (C) Copyright 2012 SAMSUNG Electronics
3 * Jaehoon Chung <jh80.chung@samsung.com>
4 *
1a459660 5 * SPDX-License-Identifier: GPL-2.0+
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6 */
7
8#include <common.h>
d0ebbb8d 9#include <dwmmc.h>
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10#include <fdtdec.h>
11#include <libfdt.h>
12#include <malloc.h>
ccd60a85 13#include <errno.h>
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14#include <asm/arch/dwmmc.h>
15#include <asm/arch/clk.h>
a082a2dd 16#include <asm/arch/pinmux.h>
64029f7a 17#include <asm/arch/power.h>
959198f7 18#include <asm/gpio.h>
d0ebbb8d 19
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20#define DWMMC_MAX_CH_NUM 4
21#define DWMMC_MAX_FREQ 52000000
22#define DWMMC_MIN_FREQ 400000
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23#define DWMMC_MMC0_SDR_TIMING_VAL 0x03030001
24#define DWMMC_MMC2_SDR_TIMING_VAL 0x03020001
25
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26#ifdef CONFIG_DM_MMC
27#include <dm.h>
28DECLARE_GLOBAL_DATA_PTR;
29
30struct exynos_mmc_plat {
31 struct mmc_config cfg;
32 struct mmc mmc;
33};
34#endif
35
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36/* Exynos implmentation specific drver private data */
37struct dwmci_exynos_priv_data {
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38#ifdef CONFIG_DM_MMC
39 struct dwmci_host host;
40#endif
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41 u32 sdr_timing;
42};
d0ebbb8d 43
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44/*
45 * Function used as callback function to initialise the
46 * CLKSEL register for every mmc channel.
47 */
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48static void exynos_dwmci_clksel(struct dwmci_host *host)
49{
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50 struct dwmci_exynos_priv_data *priv = host->priv;
51
52 dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing);
a082a2dd 53}
d0ebbb8d 54
e3563f2e 55unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq)
a082a2dd 56{
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57 unsigned long sclk;
58 int8_t clk_div;
59
60 /*
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)
65 */
66 clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT)
67 & DWMCI_DIVRATIO_MASK) + 1;
68 sclk = get_mmc_clk(host->dev_index);
69
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70 /*
71 * Assume to know divider value.
72 * When clock unit is broken, need to set "host->div"
73 */
74 return sclk / clk_div / (host->div + 1);
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75}
76
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77static void exynos_dwmci_board_init(struct dwmci_host *host)
78{
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79 struct dwmci_exynos_priv_data *priv = host->priv;
80
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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);
89 }
3a33bb18 90
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91 /* Set to timing value at initial time */
92 if (priv->sdr_timing)
3a33bb18 93 exynos_dwmci_clksel(host);
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94}
95
d956a67e 96static int exynos_dwmci_core_init(struct dwmci_host *host)
d0ebbb8d 97{
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98 unsigned int div;
99 unsigned long freq, sclk;
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100
101 if (host->bus_hz)
102 freq = host->bus_hz;
103 else
104 freq = DWMMC_MAX_FREQ;
105
a082a2dd 106 /* request mmc clock vlaue of 52MHz. */
d956a67e 107 sclk = get_mmc_clk(host->dev_index);
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108 div = DIV_ROUND_UP(sclk, freq);
109 /* set the clock divisor for mmc */
d956a67e 110 set_mmc_clk(host->dev_index, div);
d0ebbb8d 111
a082a2dd 112 host->name = "EXYNOS DWMMC";
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113#ifdef CONFIG_EXYNOS5420
114 host->quirks = DWMCI_QUIRK_DISABLE_SMU;
115#endif
18ab6755 116 host->board_init = exynos_dwmci_board_init;
a082a2dd 117
e09bd853 118 host->caps = MMC_MODE_DDR_52MHz;
d0ebbb8d 119 host->clksel = exynos_dwmci_clksel;
b44fe83a 120 host->get_mmc_clk = exynos_dwmci_get_clk;
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121
122#ifndef CONFIG_DM_MMC
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123 /* Add the mmc channel to be registered with mmc core */
124 if (add_dwmci(host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ)) {
d956a67e 125 printf("DWMMC%d registration failed\n", host->dev_index);
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126 return -1;
127 }
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128#endif
129
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130 return 0;
131}
132
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133static struct dwmci_host dwmci_host[DWMMC_MAX_CH_NUM];
134
135static int do_dwmci_init(struct dwmci_host *host)
a082a2dd 136{
d956a67e 137 int flag, err;
a082a2dd 138
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139 flag = host->buswidth == 8 ? PINMUX_FLAG_8BIT_MODE : PINMUX_FLAG_NONE;
140 err = exynos_pinmux_config(host->dev_id, flag);
141 if (err) {
d956a67e 142 printf("DWMMC%d not configure\n", host->dev_index);
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143 return err;
144 }
a082a2dd 145
d956a67e 146 return exynos_dwmci_core_init(host);
959198f7 147}
d0ebbb8d 148
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149static int exynos_dwmci_get_config(const void *blob, int node,
150 struct dwmci_host *host)
151{
152 int err = 0;
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153 u32 base, timing[3];
154 struct dwmci_exynos_priv_data *priv;
155
156 priv = malloc(sizeof(struct dwmci_exynos_priv_data));
157 if (!priv) {
9b643e31 158 pr_err("dwmci_exynos_priv_data malloc fail!\n");
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159 return -ENOMEM;
160 }
d0ebbb8d 161
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162 /* Extract device id for each mmc channel */
163 host->dev_id = pinmux_decode_periph_id(blob, node);
a082a2dd 164
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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;
168
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169 if (host->dev_index > 4) {
170 printf("DWMMC%d: Can't get the dev index\n", host->dev_index);
0e1746ac 171 free(priv);
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172 return -EINVAL;
173 }
174
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175 /* Get the bus width from the device node (Default is 4bit buswidth) */
176 host->buswidth = fdtdec_get_int(blob, node, "samsung,bus-width", 4);
a082a2dd 177
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178 /* Set the base address from the device node */
179 base = fdtdec_get_addr(blob, node, "reg");
180 if (!base) {
dfcb683a 181 printf("DWMMC%d: Can't get base address\n", host->dev_index);
0e1746ac 182 free(priv);
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183 return -EINVAL;
184 }
185 host->ioaddr = (void *)base;
186
187 /* Extract the timing info from the node */
188 err = fdtdec_get_int_array(blob, node, "samsung,timing", timing, 3);
189 if (err) {
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190 printf("DWMMC%d: Can't get sdr-timings for devider\n",
191 host->dev_index);
0e1746ac 192 free(priv);
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193 return -EINVAL;
194 }
195
5dab81ce 196 priv->sdr_timing = (DWMCI_SET_SAMPLE_CLK(timing[0]) |
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197 DWMCI_SET_DRV_CLK(timing[1]) |
198 DWMCI_SET_DIV_RATIO(timing[2]));
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199
200 /* sdr_timing didn't assigned anything, use the default value */
201 if (!priv->sdr_timing) {
202 if (host->dev_index == 0)
203 priv->sdr_timing = DWMMC_MMC0_SDR_TIMING_VAL;
204 else if (host->dev_index == 2)
205 priv->sdr_timing = DWMMC_MMC2_SDR_TIMING_VAL;
206 }
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207
208 host->fifoth_val = fdtdec_get_int(blob, node, "fifoth_val", 0);
209 host->bus_hz = fdtdec_get_int(blob, node, "bus_hz", 0);
210 host->div = fdtdec_get_int(blob, node, "div", 0);
211
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212 host->priv = priv;
213
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214 return 0;
215}
216
217static int exynos_dwmci_process_node(const void *blob,
218 int node_list[], int count)
219{
220 struct dwmci_host *host;
221 int i, node, err;
222
223 for (i = 0; i < count; i++) {
224 node = node_list[i];
225 if (node <= 0)
226 continue;
227 host = &dwmci_host[i];
228 err = exynos_dwmci_get_config(blob, node, host);
a082a2dd 229 if (err) {
dfcb683a 230 printf("%s: failed to decode dev %d\n", __func__, i);
959198f7 231 return err;
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232 }
233
959198f7 234 do_dwmci_init(host);
a082a2dd 235 }
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236 return 0;
237}
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238
239int exynos_dwmmc_init(const void *blob)
240{
959198f7 241 int node_list[DWMMC_MAX_CH_NUM];
64029f7a 242 int boot_dev_node;
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243 int err = 0, count;
244
959198f7 245 count = fdtdec_find_aliases_for_id(blob, "mmc",
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246 COMPAT_SAMSUNG_EXYNOS_DWMMC, node_list,
247 DWMMC_MAX_CH_NUM);
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248
249 /* For DWMMC always set boot device as mmc 0 */
250 if (count >= 3 && get_boot_mode() == BOOT_MODE_SD) {
251 boot_dev_node = node_list[2];
252 node_list[2] = node_list[0];
253 node_list[0] = boot_dev_node;
254 }
255
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256 err = exynos_dwmci_process_node(blob, node_list, count);
257
258 return err;
259}
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260
261#ifdef CONFIG_DM_MMC
262static int exynos_dwmmc_probe(struct udevice *dev)
263{
264 struct exynos_mmc_plat *plat = dev_get_platdata(dev);
265 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
266 struct dwmci_exynos_priv_data *priv = dev_get_priv(dev);
267 struct dwmci_host *host = &priv->host;
268 int err;
269
e160f7d4 270 err = exynos_dwmci_get_config(gd->fdt_blob, dev_of_offset(dev), host);
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271 if (err)
272 return err;
273 err = do_dwmci_init(host);
274 if (err)
275 return err;
276
e5113c33 277 dwmci_setup_cfg(&plat->cfg, host, DWMMC_MAX_FREQ, DWMMC_MIN_FREQ);
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278 host->mmc = &plat->mmc;
279 host->mmc->priv = &priv->host;
280 host->priv = dev;
281 upriv->mmc = host->mmc;
282
283 return dwmci_probe(dev);
284}
285
286static int exynos_dwmmc_bind(struct udevice *dev)
287{
288 struct exynos_mmc_plat *plat = dev_get_platdata(dev);
3537ee87 289
24f5aec3 290 return dwmci_bind(dev, &plat->mmc, &plat->cfg);
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291}
292
293static const struct udevice_id exynos_dwmmc_ids[] = {
294 { .compatible = "samsung,exynos4412-dw-mshc" },
295 { }
296};
297
298U_BOOT_DRIVER(exynos_dwmmc_drv) = {
299 .name = "exynos_dwmmc",
300 .id = UCLASS_MMC,
301 .of_match = exynos_dwmmc_ids,
302 .bind = exynos_dwmmc_bind,
303 .ops = &dm_dwmci_ops,
304 .probe = exynos_dwmmc_probe,
305 .priv_auto_alloc_size = sizeof(struct dwmci_exynos_priv_data),
306 .platdata_auto_alloc_size = sizeof(struct exynos_mmc_plat),
307};
308#endif