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5
6#include <linux/clk.h>
7#include <linux/mfd/syscon.h>
8#include <linux/mmc/host.h>
9#include <linux/module.h>
10#include <linux/of_address.h>
11#include <linux/platform_device.h>
12#include <linux/pm_runtime.h>
13#include <linux/regmap.h>
14#include <linux/regulator/consumer.h>
15
16#include "dw_mmc.h"
17#include "dw_mmc-pltfm.h"
18
19#define ALL_INT_CLR 0x1ffff
20
21struct hi3798cv200_priv {
22 struct clk *sample_clk;
23 struct clk *drive_clk;
24};
25
26static unsigned long dw_mci_hi3798cv200_caps[] = {
27 MMC_CAP_CMD23,
28 MMC_CAP_CMD23,
29 MMC_CAP_CMD23
30};
31
32static void dw_mci_hi3798cv200_set_ios(struct dw_mci *host, struct mmc_ios *ios)
33{
34 struct hi3798cv200_priv *priv = host->priv;
35 u32 val;
36
37 val = mci_readl(host, UHS_REG);
38 if (ios->timing == MMC_TIMING_MMC_DDR52 ||
39 ios->timing == MMC_TIMING_UHS_DDR50)
40 val |= SDMMC_UHS_DDR;
41 else
42 val &= ~SDMMC_UHS_DDR;
43 mci_writel(host, UHS_REG, val);
44
45 val = mci_readl(host, ENABLE_SHIFT);
46 if (ios->timing == MMC_TIMING_MMC_DDR52)
47 val |= SDMMC_ENABLE_PHASE;
48 else
49 val &= ~SDMMC_ENABLE_PHASE;
50 mci_writel(host, ENABLE_SHIFT, val);
51
52 val = mci_readl(host, DDR_REG);
53 if (ios->timing == MMC_TIMING_MMC_HS400)
54 val |= SDMMC_DDR_HS400;
55 else
56 val &= ~SDMMC_DDR_HS400;
57 mci_writel(host, DDR_REG, val);
58
59 if (ios->timing == MMC_TIMING_MMC_HS ||
60 ios->timing == MMC_TIMING_LEGACY)
61 clk_set_phase(priv->drive_clk, 180);
62 else if (ios->timing == MMC_TIMING_MMC_HS200)
63 clk_set_phase(priv->drive_clk, 135);
64}
65
66static int dw_mci_hi3798cv200_execute_tuning(struct dw_mci_slot *slot,
67 u32 opcode)
68{
69 int degrees[] = { 0, 45, 90, 135, 180, 225, 270, 315 };
70 struct dw_mci *host = slot->host;
71 struct hi3798cv200_priv *priv = host->priv;
72 int raise_point = -1, fall_point = -1;
73 int err, prev_err = -1;
74 int found = 0;
75 int i;
76
77 for (i = 0; i < ARRAY_SIZE(degrees); i++) {
78 clk_set_phase(priv->sample_clk, degrees[i]);
79 mci_writel(host, RINTSTS, ALL_INT_CLR);
80
81 err = mmc_send_tuning(slot->mmc, opcode, NULL);
82 if (!err)
83 found = 1;
84
85 if (i > 0) {
86 if (err && !prev_err)
87 fall_point = i - 1;
88 if (!err && prev_err)
89 raise_point = i;
90 }
91
92 if (raise_point != -1 && fall_point != -1)
93 goto tuning_out;
94
95 prev_err = err;
96 err = 0;
97 }
98
99tuning_out:
100 if (found) {
101 if (raise_point == -1)
102 raise_point = 0;
103 if (fall_point == -1)
104 fall_point = ARRAY_SIZE(degrees) - 1;
105 if (fall_point < raise_point) {
106 if ((raise_point + fall_point) >
107 (ARRAY_SIZE(degrees) - 1))
108 i = fall_point / 2;
109 else
110 i = (raise_point + ARRAY_SIZE(degrees) - 1) / 2;
111 } else {
112 i = (raise_point + fall_point) / 2;
113 }
114
115 clk_set_phase(priv->sample_clk, degrees[i]);
116 dev_dbg(host->dev, "Tuning clk_sample[%d, %d], set[%d]\n",
117 raise_point, fall_point, degrees[i]);
118 } else {
119 dev_err(host->dev, "No valid clk_sample shift! use default\n");
120 err = -EINVAL;
121 }
122
123 mci_writel(host, RINTSTS, ALL_INT_CLR);
124 return err;
125}
126
127static int dw_mci_hi3798cv200_init(struct dw_mci *host)
128{
129 struct hi3798cv200_priv *priv;
130 int ret;
131
132 priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
133 if (!priv)
134 return -ENOMEM;
135
136 priv->sample_clk = devm_clk_get(host->dev, "ciu-sample");
137 if (IS_ERR(priv->sample_clk)) {
138 dev_err(host->dev, "failed to get ciu-sample clock\n");
139 return PTR_ERR(priv->sample_clk);
140 }
141
142 priv->drive_clk = devm_clk_get(host->dev, "ciu-drive");
143 if (IS_ERR(priv->drive_clk)) {
144 dev_err(host->dev, "failed to get ciu-drive clock\n");
145 return PTR_ERR(priv->drive_clk);
146 }
147
148 ret = clk_prepare_enable(priv->sample_clk);
149 if (ret) {
150 dev_err(host->dev, "failed to enable ciu-sample clock\n");
151 return ret;
152 }
153
154 ret = clk_prepare_enable(priv->drive_clk);
155 if (ret) {
156 dev_err(host->dev, "failed to enable ciu-drive clock\n");
157 goto disable_sample_clk;
158 }
159
160 host->priv = priv;
161 return 0;
162
163disable_sample_clk:
164 clk_disable_unprepare(priv->sample_clk);
165 return ret;
166}
167
168static const struct dw_mci_drv_data hi3798cv200_data = {
169 .caps = dw_mci_hi3798cv200_caps,
170 .num_caps = ARRAY_SIZE(dw_mci_hi3798cv200_caps),
171 .init = dw_mci_hi3798cv200_init,
172 .set_ios = dw_mci_hi3798cv200_set_ios,
173 .execute_tuning = dw_mci_hi3798cv200_execute_tuning,
174};
175
176static int dw_mci_hi3798cv200_probe(struct platform_device *pdev)
177{
178 return dw_mci_pltfm_register(pdev, &hi3798cv200_data);
179}
180
181static int dw_mci_hi3798cv200_remove(struct platform_device *pdev)
182{
183 struct dw_mci *host = platform_get_drvdata(pdev);
184 struct hi3798cv200_priv *priv = host->priv;
185
186 clk_disable_unprepare(priv->drive_clk);
187 clk_disable_unprepare(priv->sample_clk);
188
189 return dw_mci_pltfm_remove(pdev);
190}
191
192static const struct of_device_id dw_mci_hi3798cv200_match[] = {
193 { .compatible = "hisilicon,hi3798cv200-dw-mshc", },
194 {},
195};
196
197MODULE_DEVICE_TABLE(of, dw_mci_hi3798cv200_match);
198static struct platform_driver dw_mci_hi3798cv200_driver = {
199 .probe = dw_mci_hi3798cv200_probe,
200 .remove = dw_mci_hi3798cv200_remove,
201 .driver = {
202 .name = "dwmmc_hi3798cv200",
203 .of_match_table = dw_mci_hi3798cv200_match,
204 },
205};
206module_platform_driver(dw_mci_hi3798cv200_driver);
207
208MODULE_DESCRIPTION("HiSilicon Hi3798CV200 Specific DW-MSHC Driver Extension");
209MODULE_LICENSE("GPL v2");
210MODULE_ALIAS("platform:dwmmc_hi3798cv200");
211
