1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2016 Socionext Inc.
4 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <linux/bitfield.h>
10 #include <linux/io.h>
11 #include <linux/iopoll.h>
12 #include <linux/sizes.h>
13 #include <linux/libfdt.h>
14 #include <mmc.h>
15 #include <sdhci.h>
16
17 /* HRS - Host Register Set (specific to Cadence) */
18 #define SDHCI_CDNS_HRS04 0x10 /* PHY access port */
19 #define SDHCI_CDNS_HRS04_ACK BIT(26)
20 #define SDHCI_CDNS_HRS04_RD BIT(25)
21 #define SDHCI_CDNS_HRS04_WR BIT(24)
22 #define SDHCI_CDNS_HRS04_RDATA GENMASK(23, 16)
23 #define SDHCI_CDNS_HRS04_WDATA GENMASK(15, 8)
24 #define SDHCI_CDNS_HRS04_ADDR GENMASK(5, 0)
25
26 #define SDHCI_CDNS_HRS06 0x18 /* eMMC control */
27 #define SDHCI_CDNS_HRS06_TUNE_UP BIT(15)
28 #define SDHCI_CDNS_HRS06_TUNE GENMASK(13, 8)
29 #define SDHCI_CDNS_HRS06_MODE GENMASK(2, 0)
30 #define SDHCI_CDNS_HRS06_MODE_SD 0x0
31 #define SDHCI_CDNS_HRS06_MODE_MMC_SDR 0x2
32 #define SDHCI_CDNS_HRS06_MODE_MMC_DDR 0x3
33 #define SDHCI_CDNS_HRS06_MODE_MMC_HS200 0x4
34 #define SDHCI_CDNS_HRS06_MODE_MMC_HS400 0x5
35 #define SDHCI_CDNS_HRS06_MODE_MMC_HS400ES 0x6
36
37 /* SRS - Slot Register Set (SDHCI-compatible) */
38 #define SDHCI_CDNS_SRS_BASE 0x200
39
40 /* PHY */
41 #define SDHCI_CDNS_PHY_DLY_SD_HS 0x00
42 #define SDHCI_CDNS_PHY_DLY_SD_DEFAULT 0x01
43 #define SDHCI_CDNS_PHY_DLY_UHS_SDR12 0x02
44 #define SDHCI_CDNS_PHY_DLY_UHS_SDR25 0x03
45 #define SDHCI_CDNS_PHY_DLY_UHS_SDR50 0x04
46 #define SDHCI_CDNS_PHY_DLY_UHS_DDR50 0x05
47 #define SDHCI_CDNS_PHY_DLY_EMMC_LEGACY 0x06
48 #define SDHCI_CDNS_PHY_DLY_EMMC_SDR 0x07
49 #define SDHCI_CDNS_PHY_DLY_EMMC_DDR 0x08
50 #define SDHCI_CDNS_PHY_DLY_SDCLK 0x0b
51 #define SDHCI_CDNS_PHY_DLY_HSMMC 0x0c
52 #define SDHCI_CDNS_PHY_DLY_STROBE 0x0d
53
54 /*
55 * The tuned val register is 6 bit-wide, but not the whole of the range is
56 * available. The range 0-42 seems to be available (then 43 wraps around to 0)
57 * but I am not quite sure if it is official. Use only 0 to 39 for safety.
58 */
59 #define SDHCI_CDNS_MAX_TUNING_LOOP 40
60
61 struct sdhci_cdns_plat {
62 struct mmc_config cfg;
63 struct mmc mmc;
64 void __iomem *hrs_addr;
65 };
66
67 struct sdhci_cdns_phy_cfg {
68 const char *property;
69 u8 addr;
70 };
71
72 static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = {
73 { "cdns,phy-input-delay-sd-highspeed", SDHCI_CDNS_PHY_DLY_SD_HS, },
74 { "cdns,phy-input-delay-legacy", SDHCI_CDNS_PHY_DLY_SD_DEFAULT, },
75 { "cdns,phy-input-delay-sd-uhs-sdr12", SDHCI_CDNS_PHY_DLY_UHS_SDR12, },
76 { "cdns,phy-input-delay-sd-uhs-sdr25", SDHCI_CDNS_PHY_DLY_UHS_SDR25, },
77 { "cdns,phy-input-delay-sd-uhs-sdr50", SDHCI_CDNS_PHY_DLY_UHS_SDR50, },
78 { "cdns,phy-input-delay-sd-uhs-ddr50", SDHCI_CDNS_PHY_DLY_UHS_DDR50, },
79 { "cdns,phy-input-delay-mmc-highspeed", SDHCI_CDNS_PHY_DLY_EMMC_SDR, },
80 { "cdns,phy-input-delay-mmc-ddr", SDHCI_CDNS_PHY_DLY_EMMC_DDR, },
81 { "cdns,phy-dll-delay-sdclk", SDHCI_CDNS_PHY_DLY_SDCLK, },
82 { "cdns,phy-dll-delay-sdclk-hsmmc", SDHCI_CDNS_PHY_DLY_HSMMC, },
83 { "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, },
84 };
85
sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat * plat,u8 addr,u8 data)86 static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_plat *plat,
87 u8 addr, u8 data)
88 {
89 void __iomem *reg = plat->hrs_addr + SDHCI_CDNS_HRS04;
90 u32 tmp;
91 int ret;
92
93 tmp = FIELD_PREP(SDHCI_CDNS_HRS04_WDATA, data) |
94 FIELD_PREP(SDHCI_CDNS_HRS04_ADDR, addr);
95 writel(tmp, reg);
96
97 tmp |= SDHCI_CDNS_HRS04_WR;
98 writel(tmp, reg);
99
100 ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 10);
101 if (ret)
102 return ret;
103
104 tmp &= ~SDHCI_CDNS_HRS04_WR;
105 writel(tmp, reg);
106
107 return 0;
108 }
109
sdhci_cdns_phy_init(struct sdhci_cdns_plat * plat,const void * fdt,int nodeoffset)110 static int sdhci_cdns_phy_init(struct sdhci_cdns_plat *plat,
111 const void *fdt, int nodeoffset)
112 {
113 const fdt32_t *prop;
114 int ret, i;
115
116 for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++) {
117 prop = fdt_getprop(fdt, nodeoffset,
118 sdhci_cdns_phy_cfgs[i].property, NULL);
119 if (!prop)
120 continue;
121
122 ret = sdhci_cdns_write_phy_reg(plat,
123 sdhci_cdns_phy_cfgs[i].addr,
124 fdt32_to_cpu(*prop));
125 if (ret)
126 return ret;
127 }
128
129 return 0;
130 }
131
sdhci_cdns_set_control_reg(struct sdhci_host * host)132 static void sdhci_cdns_set_control_reg(struct sdhci_host *host)
133 {
134 struct mmc *mmc = host->mmc;
135 struct sdhci_cdns_plat *plat = dev_get_platdata(mmc->dev);
136 unsigned int clock = mmc->clock;
137 u32 mode, tmp;
138
139 /*
140 * REVISIT:
141 * The mode should be decided by MMC_TIMING_* like Linux, but
142 * U-Boot does not support timing. Use the clock frequency instead.
143 */
144 if (clock <= 26000000) {
145 mode = SDHCI_CDNS_HRS06_MODE_SD; /* use this for Legacy */
146 } else if (clock <= 52000000) {
147 if (mmc->ddr_mode)
148 mode = SDHCI_CDNS_HRS06_MODE_MMC_DDR;
149 else
150 mode = SDHCI_CDNS_HRS06_MODE_MMC_SDR;
151 } else {
152 if (mmc->ddr_mode)
153 mode = SDHCI_CDNS_HRS06_MODE_MMC_HS400;
154 else
155 mode = SDHCI_CDNS_HRS06_MODE_MMC_HS200;
156 }
157
158 tmp = readl(plat->hrs_addr + SDHCI_CDNS_HRS06);
159 tmp &= ~SDHCI_CDNS_HRS06_MODE;
160 tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_MODE, mode);
161 writel(tmp, plat->hrs_addr + SDHCI_CDNS_HRS06);
162 }
163
164 static const struct sdhci_ops sdhci_cdns_ops = {
165 .set_control_reg = sdhci_cdns_set_control_reg,
166 };
167
sdhci_cdns_set_tune_val(struct sdhci_cdns_plat * plat,unsigned int val)168 static int sdhci_cdns_set_tune_val(struct sdhci_cdns_plat *plat,
169 unsigned int val)
170 {
171 void __iomem *reg = plat->hrs_addr + SDHCI_CDNS_HRS06;
172 u32 tmp;
173
174 if (WARN_ON(!FIELD_FIT(SDHCI_CDNS_HRS06_TUNE, val)))
175 return -EINVAL;
176
177 tmp = readl(reg);
178 tmp &= ~SDHCI_CDNS_HRS06_TUNE;
179 tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_TUNE, val);
180 tmp |= SDHCI_CDNS_HRS06_TUNE_UP;
181 writel(tmp, reg);
182
183 return readl_poll_timeout(reg, tmp, !(tmp & SDHCI_CDNS_HRS06_TUNE_UP),
184 1);
185 }
186
sdhci_cdns_execute_tuning(struct udevice * dev,unsigned int opcode)187 static int __maybe_unused sdhci_cdns_execute_tuning(struct udevice *dev,
188 unsigned int opcode)
189 {
190 struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
191 struct mmc *mmc = &plat->mmc;
192 int cur_streak = 0;
193 int max_streak = 0;
194 int end_of_streak = 0;
195 int i;
196
197 /*
198 * This handler only implements the eMMC tuning that is specific to
199 * this controller. The tuning for SD timing should be handled by the
200 * SDHCI core.
201 */
202 if (!IS_MMC(mmc))
203 return -ENOTSUPP;
204
205 if (WARN_ON(opcode != MMC_CMD_SEND_TUNING_BLOCK_HS200))
206 return -EINVAL;
207
208 for (i = 0; i < SDHCI_CDNS_MAX_TUNING_LOOP; i++) {
209 if (sdhci_cdns_set_tune_val(plat, i) ||
210 mmc_send_tuning(mmc, opcode, NULL)) { /* bad */
211 cur_streak = 0;
212 } else { /* good */
213 cur_streak++;
214 if (cur_streak > max_streak) {
215 max_streak = cur_streak;
216 end_of_streak = i;
217 }
218 }
219 }
220
221 if (!max_streak) {
222 dev_err(dev, "no tuning point found\n");
223 return -EIO;
224 }
225
226 return sdhci_cdns_set_tune_val(plat, end_of_streak - max_streak / 2);
227 }
228
229 static struct dm_mmc_ops sdhci_cdns_mmc_ops;
230
sdhci_cdns_bind(struct udevice * dev)231 static int sdhci_cdns_bind(struct udevice *dev)
232 {
233 struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
234
235 return sdhci_bind(dev, &plat->mmc, &plat->cfg);
236 }
237
sdhci_cdns_probe(struct udevice * dev)238 static int sdhci_cdns_probe(struct udevice *dev)
239 {
240 DECLARE_GLOBAL_DATA_PTR;
241 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
242 struct sdhci_cdns_plat *plat = dev_get_platdata(dev);
243 struct sdhci_host *host = dev_get_priv(dev);
244 fdt_addr_t base;
245 int ret;
246
247 base = devfdt_get_addr(dev);
248 if (base == FDT_ADDR_T_NONE)
249 return -EINVAL;
250
251 plat->hrs_addr = devm_ioremap(dev, base, SZ_1K);
252 if (!plat->hrs_addr)
253 return -ENOMEM;
254
255 host->name = dev->name;
256 host->ioaddr = plat->hrs_addr + SDHCI_CDNS_SRS_BASE;
257 host->ops = &sdhci_cdns_ops;
258 host->quirks |= SDHCI_QUIRK_WAIT_SEND_CMD;
259 sdhci_cdns_mmc_ops = sdhci_ops;
260 #ifdef MMC_SUPPORTS_TUNING
261 sdhci_cdns_mmc_ops.execute_tuning = sdhci_cdns_execute_tuning;
262 #endif
263
264 ret = mmc_of_parse(dev, &plat->cfg);
265 if (ret)
266 return ret;
267
268 ret = sdhci_cdns_phy_init(plat, gd->fdt_blob, dev_of_offset(dev));
269 if (ret)
270 return ret;
271
272 ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);
273 if (ret)
274 return ret;
275
276 upriv->mmc = &plat->mmc;
277 host->mmc = &plat->mmc;
278 host->mmc->priv = host;
279
280 return sdhci_probe(dev);
281 }
282
283 static const struct udevice_id sdhci_cdns_match[] = {
284 { .compatible = "socionext,uniphier-sd4hc" },
285 { .compatible = "cdns,sd4hc" },
286 { /* sentinel */ }
287 };
288
289 U_BOOT_DRIVER(sdhci_cdns) = {
290 .name = "sdhci-cdns",
291 .id = UCLASS_MMC,
292 .of_match = sdhci_cdns_match,
293 .bind = sdhci_cdns_bind,
294 .probe = sdhci_cdns_probe,
295 .priv_auto_alloc_size = sizeof(struct sdhci_host),
296 .platdata_auto_alloc_size = sizeof(struct sdhci_cdns_plat),
297 .ops = &sdhci_cdns_mmc_ops,
298 };
299