1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
5 * Texas Instruments' K3 SD Host Controller Interface
12 #include <power-domain.h>
16 /* CTL_CFG Registers */
17 #define CTL_CFG_2 0x14
19 #define SLOTTYPE_MASK GENMASK(31, 30)
20 #define SLOTTYPE_EMBEDDED BIT(30)
23 #define PHY_CTRL1 0x100
24 #define PHY_CTRL2 0x104
25 #define PHY_CTRL3 0x108
26 #define PHY_CTRL4 0x10C
27 #define PHY_CTRL5 0x110
28 #define PHY_CTRL6 0x114
29 #define PHY_STAT1 0x130
30 #define PHY_STAT2 0x134
32 #define IOMUX_ENABLE_SHIFT 31
33 #define IOMUX_ENABLE_MASK BIT(IOMUX_ENABLE_SHIFT)
34 #define OTAPDLYENA_SHIFT 20
35 #define OTAPDLYENA_MASK BIT(OTAPDLYENA_SHIFT)
36 #define OTAPDLYSEL_SHIFT 12
37 #define OTAPDLYSEL_MASK GENMASK(15, 12)
38 #define STRBSEL_SHIFT 24
39 #define STRBSEL_MASK GENMASK(27, 24)
41 #define SEL50_MASK BIT(SEL50_SHIFT)
42 #define SEL100_SHIFT 9
43 #define SEL100_MASK BIT(SEL100_SHIFT)
44 #define DLL_TRIM_ICP_SHIFT 4
45 #define DLL_TRIM_ICP_MASK GENMASK(7, 4)
46 #define DR_TY_SHIFT 20
47 #define DR_TY_MASK GENMASK(22, 20)
49 #define ENDLL_MASK BIT(ENDLL_SHIFT)
50 #define DLLRDY_SHIFT 0
51 #define DLLRDY_MASK BIT(DLLRDY_SHIFT)
53 #define PDB_MASK BIT(PDB_SHIFT)
54 #define CALDONE_SHIFT 1
55 #define CALDONE_MASK BIT(CALDONE_SHIFT)
56 #define RETRIM_SHIFT 17
57 #define RETRIM_MASK BIT(RETRIM_SHIFT)
59 #define DRIVER_STRENGTH_50_OHM 0x0
60 #define DRIVER_STRENGTH_33_OHM 0x1
61 #define DRIVER_STRENGTH_66_OHM 0x2
62 #define DRIVER_STRENGTH_100_OHM 0x3
63 #define DRIVER_STRENGTH_40_OHM 0x4
65 #define AM654_SDHCI_MIN_FREQ 400000
67 struct am654_sdhci_plat {
68 struct mmc_config cfg;
78 static int am654_sdhci_set_ios_post(struct sdhci_host *host)
80 struct udevice *dev = host->mmc->dev;
81 struct am654_sdhci_plat *plat = dev_get_platdata(dev);
82 unsigned int speed = host->mmc->clock;
87 /* Reset SD Clock Enable */
88 val = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
89 val &= ~SDHCI_CLOCK_CARD_EN;
90 sdhci_writew(host, val, SDHCI_CLOCK_CONTROL);
94 regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK, 0);
100 sdhci_set_clock(host->mmc, speed);
102 /* switch phy back on */
103 if (speed > AM654_SDHCI_MIN_FREQ) {
104 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
105 val = (1 << OTAPDLYENA_SHIFT) |
106 (plat->otap_del_sel << OTAPDLYSEL_SHIFT);
107 regmap_update_bits(plat->base, PHY_CTRL4, mask, val);
122 /* Configure PHY DLL frequency */
123 mask = SEL50_MASK | SEL100_MASK;
124 val = (sel50 << SEL50_SHIFT) | (sel100 << SEL100_SHIFT);
125 regmap_update_bits(plat->base, PHY_CTRL5, mask, val);
128 regmap_update_bits(plat->base, PHY_CTRL1, ENDLL_MASK,
131 * Poll for DLL ready. Use a one second timeout.
132 * Works in all experiments done so far
134 ret = regmap_read_poll_timeout(plat->base, PHY_STAT1, val,
135 val & DLLRDY_MASK, 1000, 1000000);
145 const struct sdhci_ops am654_sdhci_ops = {
146 .set_ios_post = &am654_sdhci_set_ios_post,
149 int am654_sdhci_init(struct am654_sdhci_plat *plat)
155 /* Reset OTAP to default value */
156 mask = OTAPDLYENA_MASK | OTAPDLYSEL_MASK;
157 regmap_update_bits(plat->base, PHY_CTRL4, mask, 0x0);
159 regmap_read(plat->base, PHY_STAT1, &val);
160 if (~val & CALDONE_MASK) {
161 /* Calibrate IO lines */
162 regmap_update_bits(plat->base, PHY_CTRL1, PDB_MASK, PDB_MASK);
163 ret = regmap_read_poll_timeout(plat->base, PHY_STAT1, val,
164 val & CALDONE_MASK, 1, 20);
169 /* Configure DLL TRIM */
170 mask = DLL_TRIM_ICP_MASK;
171 val = plat->trm_icp << DLL_TRIM_ICP_SHIFT;
173 /* Configure DLL driver strength */
175 val |= plat->drv_strength << DR_TY_SHIFT;
176 regmap_update_bits(plat->base, PHY_CTRL1, mask, val);
178 /* Enable pins by setting IO mux to 0 */
179 regmap_update_bits(plat->base, PHY_CTRL1, IOMUX_ENABLE_MASK, 0);
181 /* Set slot type based on SD or eMMC */
182 if (plat->non_removable)
183 ctl_cfg_2 = SLOTTYPE_EMBEDDED;
185 regmap_update_bits(plat->base, CTL_CFG_2, SLOTTYPE_MASK, ctl_cfg_2);
190 static int am654_sdhci_probe(struct udevice *dev)
192 struct am654_sdhci_plat *plat = dev_get_platdata(dev);
193 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
194 struct sdhci_host *host = dev_get_priv(dev);
195 struct mmc_config *cfg = &plat->cfg;
196 struct power_domain sdhci_pwrdmn;
201 ret = power_domain_get_by_index(dev, &sdhci_pwrdmn, 0);
203 dev_err(dev, "failed to get power domain\n");
207 ret = power_domain_on(&sdhci_pwrdmn);
209 dev_err(dev, "Power domain on failed\n");
213 ret = clk_get_by_index(dev, 0, &clk);
215 dev_err(dev, "failed to get clock\n");
219 clock = clk_get_rate(&clk);
220 if (IS_ERR_VALUE(clock)) {
221 dev_err(dev, "failed to get rate\n");
225 host->max_clk = clock;
226 host->mmc = &plat->mmc;
227 host->mmc->dev = dev;
228 ret = sdhci_setup_cfg(cfg, host, cfg->f_max,
229 AM654_SDHCI_MIN_FREQ);
232 host->ops = &am654_sdhci_ops;
233 host->mmc->priv = host;
234 upriv->mmc = host->mmc;
236 regmap_init_mem_index(dev_ofnode(dev), &plat->base, 1);
238 am654_sdhci_init(plat);
240 return sdhci_probe(dev);
243 static int am654_sdhci_ofdata_to_platdata(struct udevice *dev)
245 struct am654_sdhci_plat *plat = dev_get_platdata(dev);
246 struct sdhci_host *host = dev_get_priv(dev);
247 struct mmc_config *cfg = &plat->cfg;
251 host->name = dev->name;
252 host->ioaddr = (void *)dev_read_addr(dev);
253 plat->non_removable = dev_read_bool(dev, "non-removable");
255 ret = dev_read_u32(dev, "ti,trm-icp", &plat->trm_icp);
259 ret = dev_read_u32(dev, "ti,otap-del-sel", &plat->otap_del_sel);
263 ret = dev_read_u32(dev, "ti,driver-strength-ohm", &drv_strength);
267 switch (drv_strength) {
269 plat->drv_strength = DRIVER_STRENGTH_50_OHM;
272 plat->drv_strength = DRIVER_STRENGTH_33_OHM;
275 plat->drv_strength = DRIVER_STRENGTH_66_OHM;
278 plat->drv_strength = DRIVER_STRENGTH_100_OHM;
281 plat->drv_strength = DRIVER_STRENGTH_40_OHM;
284 dev_err(dev, "Invalid driver strength\n");
288 ret = mmc_of_parse(dev, cfg);
295 static int am654_sdhci_bind(struct udevice *dev)
297 struct am654_sdhci_plat *plat = dev_get_platdata(dev);
299 return sdhci_bind(dev, &plat->mmc, &plat->cfg);
302 static const struct udevice_id am654_sdhci_ids[] = {
303 { .compatible = "ti,am654-sdhci-5.1" },
307 U_BOOT_DRIVER(am654_sdhci_drv) = {
308 .name = "am654_sdhci",
310 .of_match = am654_sdhci_ids,
311 .ofdata_to_platdata = am654_sdhci_ofdata_to_platdata,
313 .bind = am654_sdhci_bind,
314 .probe = am654_sdhci_probe,
315 .priv_auto_alloc_size = sizeof(struct sdhci_host),
316 .platdata_auto_alloc_size = sizeof(struct am654_sdhci_plat),