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12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/clk.h>
15#include <linux/mmc/host.h>
16#include <linux/mmc/dw_mmc.h>
17#include <linux/of.h>
18#include <linux/of_gpio.h>
19
20#include "dw_mmc.h"
21#include "dw_mmc-pltfm.h"
22
23#define NUM_PINS(x) (x + 2)
24
25#define SDMMC_CLKSEL 0x09C
26#define SDMMC_CLKSEL_CCLK_SAMPLE(x) (((x) & 7) << 0)
27#define SDMMC_CLKSEL_CCLK_DRIVE(x) (((x) & 7) << 16)
28#define SDMMC_CLKSEL_CCLK_DIVIDER(x) (((x) & 7) << 24)
29#define SDMMC_CLKSEL_GET_DRV_WD3(x) (((x) >> 16) & 0x7)
30#define SDMMC_CLKSEL_TIMING(x, y, z) (SDMMC_CLKSEL_CCLK_SAMPLE(x) | \
31 SDMMC_CLKSEL_CCLK_DRIVE(y) | \
32 SDMMC_CLKSEL_CCLK_DIVIDER(z))
33
34#define SDMMC_CMD_USE_HOLD_REG BIT(29)
35
36#define EXYNOS4210_FIXED_CIU_CLK_DIV 2
37#define EXYNOS4412_FIXED_CIU_CLK_DIV 4
38
39
40enum dw_mci_exynos_type {
41 DW_MCI_TYPE_EXYNOS4210,
42 DW_MCI_TYPE_EXYNOS4412,
43 DW_MCI_TYPE_EXYNOS5250,
44};
45
46
47struct dw_mci_exynos_priv_data {
48 enum dw_mci_exynos_type ctrl_type;
49 u8 ciu_div;
50 u32 sdr_timing;
51 u32 ddr_timing;
52};
53
54static struct dw_mci_exynos_compatible {
55 char *compatible;
56 enum dw_mci_exynos_type ctrl_type;
57} exynos_compat[] = {
58 {
59 .compatible = "samsung,exynos4210-dw-mshc",
60 .ctrl_type = DW_MCI_TYPE_EXYNOS4210,
61 }, {
62 .compatible = "samsung,exynos4412-dw-mshc",
63 .ctrl_type = DW_MCI_TYPE_EXYNOS4412,
64 }, {
65 .compatible = "samsung,exynos5250-dw-mshc",
66 .ctrl_type = DW_MCI_TYPE_EXYNOS5250,
67 },
68};
69
70static int dw_mci_exynos_priv_init(struct dw_mci *host)
71{
72 struct dw_mci_exynos_priv_data *priv;
73 int idx;
74
75 priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
76 if (!priv) {
77 dev_err(host->dev, "mem alloc failed for private data\n");
78 return -ENOMEM;
79 }
80
81 for (idx = 0; idx < ARRAY_SIZE(exynos_compat); idx++) {
82 if (of_device_is_compatible(host->dev->of_node,
83 exynos_compat[idx].compatible))
84 priv->ctrl_type = exynos_compat[idx].ctrl_type;
85 }
86
87 host->priv = priv;
88 return 0;
89}
90
91static int dw_mci_exynos_setup_clock(struct dw_mci *host)
92{
93 struct dw_mci_exynos_priv_data *priv = host->priv;
94
95 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5250)
96 host->bus_hz /= (priv->ciu_div + 1);
97 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412)
98 host->bus_hz /= EXYNOS4412_FIXED_CIU_CLK_DIV;
99 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210)
100 host->bus_hz /= EXYNOS4210_FIXED_CIU_CLK_DIV;
101
102 return 0;
103}
104
105static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr)
106{
107
108
109
110
111
112
113
114 if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL)))
115 *cmdr |= SDMMC_CMD_USE_HOLD_REG;
116}
117
118static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
119{
120 struct dw_mci_exynos_priv_data *priv = host->priv;
121
122 if (ios->timing == MMC_TIMING_UHS_DDR50)
123 mci_writel(host, CLKSEL, priv->ddr_timing);
124 else
125 mci_writel(host, CLKSEL, priv->sdr_timing);
126}
127
128static int dw_mci_exynos_parse_dt(struct dw_mci *host)
129{
130 struct dw_mci_exynos_priv_data *priv = host->priv;
131 struct device_node *np = host->dev->of_node;
132 u32 timing[2];
133 u32 div = 0;
134 int ret;
135
136 of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div);
137 priv->ciu_div = div;
138
139 ret = of_property_read_u32_array(np,
140 "samsung,dw-mshc-sdr-timing", timing, 2);
141 if (ret)
142 return ret;
143
144 priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
145
146 ret = of_property_read_u32_array(np,
147 "samsung,dw-mshc-ddr-timing", timing, 2);
148 if (ret)
149 return ret;
150
151 priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div);
152 return 0;
153}
154
155static int dw_mci_exynos_setup_bus(struct dw_mci *host,
156 struct device_node *slot_np, u8 bus_width)
157{
158 int idx, gpio, ret;
159
160 if (!slot_np)
161 return -EINVAL;
162
163
164 for (idx = 0; idx < NUM_PINS(bus_width); idx++) {
165 gpio = of_get_gpio(slot_np, idx);
166 if (!gpio_is_valid(gpio)) {
167 dev_err(host->dev, "invalid gpio: %d\n", gpio);
168 return -EINVAL;
169 }
170
171 ret = devm_gpio_request(host->dev, gpio, "dw-mci-bus");
172 if (ret) {
173 dev_err(host->dev, "gpio [%d] request failed\n", gpio);
174 return -EBUSY;
175 }
176 }
177
178 if (host->pdata->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
179 return 0;
180
181 gpio = of_get_named_gpio(slot_np, "samsung,cd-pinmux-gpio", 0);
182 if (gpio_is_valid(gpio)) {
183 if (devm_gpio_request(host->dev, gpio, "dw-mci-cd"))
184 dev_err(host->dev, "gpio [%d] request failed\n", gpio);
185 } else {
186 dev_info(host->dev, "cd gpio not available");
187 }
188
189 return 0;
190}
191
192
193static unsigned long exynos5250_dwmmc_caps[4] = {
194 MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR |
195 MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23,
196 MMC_CAP_CMD23,
197 MMC_CAP_CMD23,
198 MMC_CAP_CMD23,
199};
200
201static const struct dw_mci_drv_data exynos5250_drv_data = {
202 .caps = exynos5250_dwmmc_caps,
203 .init = dw_mci_exynos_priv_init,
204 .setup_clock = dw_mci_exynos_setup_clock,
205 .prepare_command = dw_mci_exynos_prepare_command,
206 .set_ios = dw_mci_exynos_set_ios,
207 .parse_dt = dw_mci_exynos_parse_dt,
208 .setup_bus = dw_mci_exynos_setup_bus,
209};
210
211static const struct of_device_id dw_mci_exynos_match[] = {
212 { .compatible = "samsung,exynos5250-dw-mshc",
213 .data = &exynos5250_drv_data, },
214 {},
215};
216MODULE_DEVICE_TABLE(of, dw_mci_exynos_match);
217
218int dw_mci_exynos_probe(struct platform_device *pdev)
219{
220 const struct dw_mci_drv_data *drv_data;
221 const struct of_device_id *match;
222
223 match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
224 drv_data = match->data;
225 return dw_mci_pltfm_register(pdev, drv_data);
226}
227
228static struct platform_driver dw_mci_exynos_pltfm_driver = {
229 .probe = dw_mci_exynos_probe,
230 .remove = __exit_p(dw_mci_pltfm_remove),
231 .driver = {
232 .name = "dwmmc_exynos",
233 .of_match_table = of_match_ptr(dw_mci_exynos_match),
234 .pm = &dw_mci_pltfm_pmops,
235 },
236};
237
238module_platform_driver(dw_mci_exynos_pltfm_driver);
239
240MODULE_DESCRIPTION("Samsung Specific DW-MSHC Driver Extension");
241MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com");
242MODULE_LICENSE("GPL v2");
243MODULE_ALIAS("platform:dwmmc-exynos");
244
