1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
4 * Jean-Jacques Hiblot <jjhiblot@ti.com>
11 #include <linux/delay.h>
12 #include <linux/err.h>
13 #include <power/pmic.h>
14 #include <power/regulator.h>
17 #include <linux/bitops.h>
18 #include <linux/ioport.h>
19 #include <dm/device-internal.h>
21 #ifdef CONFIG_MMC_OMAP36XX_PINS
22 #include <asm/arch/sys_proto.h>
24 #include <asm/arch/mux.h>
27 struct pbias_reg_info {
32 unsigned int enable_time;
37 struct regmap *regmap;
41 static const struct pmic_child_info pmic_children_info[] = {
42 { .prefix = "pbias", .driver = "pbias_regulator"},
46 static int pbias_write(struct udevice *dev, uint reg, const uint8_t *buff,
49 struct pbias_priv *priv = dev_get_priv(dev);
50 u32 val = *(u32 *)buff;
55 return regmap_write(priv->regmap, priv->offset, val);
58 static int pbias_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
60 struct pbias_priv *priv = dev_get_priv(dev);
65 return regmap_read(priv->regmap, priv->offset, (u32 *)buff);
68 static int pbias_of_to_plat(struct udevice *dev)
70 struct pbias_priv *priv = dev_get_priv(dev);
71 struct udevice *syscon;
72 struct regmap *regmap;
76 err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
79 pr_err("%s: unable to find syscon device (%d)\n", __func__,
84 regmap = syscon_get_regmap(syscon);
86 pr_err("%s: unable to find regmap (%ld)\n", __func__,
88 return PTR_ERR(regmap);
90 priv->regmap = regmap;
92 err = dev_read_resource(dev, 0, &res);
94 pr_err("%s: unable to find offset (%d)\n", __func__, err);
97 priv->offset = res.start;
102 static int pbias_bind(struct udevice *dev)
106 children = pmic_bind_children(dev, dev->node, pmic_children_info);
108 debug("%s: %s - no child found\n", __func__, dev->name);
113 static struct dm_pmic_ops pbias_ops = {
115 .write = pbias_write,
118 static const struct udevice_id pbias_ids[] = {
119 { .compatible = "ti,pbias-dra7" },
120 { .compatible = "ti,pbias-omap2" },
121 { .compatible = "ti,pbias-omap3" },
122 { .compatible = "ti,pbias-omap4" },
123 { .compatible = "ti,pbias-omap5" },
127 U_BOOT_DRIVER(pbias_pmic) = {
128 .name = "pbias_pmic",
130 .of_match = pbias_ids,
133 .of_to_plat = pbias_of_to_plat,
134 .priv_auto = sizeof(struct pbias_priv),
137 static const struct pbias_reg_info pbias_mmc_omap2430 = {
139 .enable_mask = BIT(1),
143 .name = "pbias_mmc_omap2430"
146 static const struct pbias_reg_info pbias_sim_omap3 = {
148 .enable_mask = BIT(9),
151 .name = "pbias_sim_omap3"
154 static const struct pbias_reg_info pbias_mmc_omap4 = {
155 .enable = BIT(26) | BIT(22),
156 .enable_mask = BIT(26) | BIT(25) | BIT(22),
157 .disable_val = BIT(25),
160 .name = "pbias_mmc_omap4"
163 static const struct pbias_reg_info pbias_mmc_omap5 = {
164 .enable = BIT(27) | BIT(26),
165 .enable_mask = BIT(27) | BIT(25) | BIT(26),
166 .disable_val = BIT(25),
169 .name = "pbias_mmc_omap5"
172 static const struct pbias_reg_info *pbias_reg_infos[] = {
180 static int pbias_regulator_probe(struct udevice *dev)
182 const struct pbias_reg_info **p = pbias_reg_infos;
183 struct dm_regulator_uclass_plat *uc_pdata;
185 uc_pdata = dev_get_uclass_plat(dev);
190 rc = dev_read_stringlist_search(dev, "regulator-name",
193 debug("found regulator %s\n", (*p)->name);
195 } else if (rc != -ENODATA) {
205 while (dev_read_string_index(dev, "regulator-name", i++, &s) >= 0)
206 debug("%s'%s' ", (i > 1) ? ", " : "", s);
207 debug("%s not supported\n", (i > 2) ? "are" : "is");
211 uc_pdata->type = REGULATOR_TYPE_OTHER;
212 dev_set_priv(dev, (void *)*p);
217 static int pbias_regulator_get_value(struct udevice *dev)
219 const struct pbias_reg_info *p = dev_get_priv(dev);
223 rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
227 debug("%s voltage id %s\n", p->name,
228 (reg & p->vmode) ? "3.0v" : "1.8v");
229 return (reg & p->vmode) ? 3000000 : 1800000;
232 static int pbias_regulator_set_value(struct udevice *dev, int uV)
234 const struct pbias_reg_info *p = dev_get_priv(dev);
237 #ifdef CONFIG_MMC_OMAP36XX_PINS
238 u32 wkup_ctrl = readl(OMAP34XX_CTRL_WKUP_CTRL);
241 rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
247 else if (uV == 1800000)
252 debug("Setting %s voltage to %s\n", p->name,
253 (reg & p->vmode) ? "3.0v" : "1.8v");
255 #ifdef CONFIG_MMC_OMAP36XX_PINS
256 if (get_cpu_family() == CPU_OMAP36XX) {
257 /* Disable extended drain IO before changing PBIAS */
258 wkup_ctrl &= ~OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ;
259 writel(wkup_ctrl, OMAP34XX_CTRL_WKUP_CTRL);
262 ret = pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg));
263 #ifdef CONFIG_MMC_OMAP36XX_PINS
264 if (get_cpu_family() == CPU_OMAP36XX) {
265 /* Enable extended drain IO after changing PBIAS */
267 OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ,
268 OMAP34XX_CTRL_WKUP_CTRL);
274 static int pbias_regulator_get_enable(struct udevice *dev)
276 const struct pbias_reg_info *p = dev_get_priv(dev);
280 rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
284 debug("%s id %s\n", p->name,
285 (reg & p->enable_mask) == (p->disable_val) ? "on" : "off");
287 return (reg & p->enable_mask) == (p->disable_val);
290 static int pbias_regulator_set_enable(struct udevice *dev, bool enable)
292 const struct pbias_reg_info *p = dev_get_priv(dev);
295 #ifdef CONFIG_MMC_OMAP36XX_PINS
296 u32 wkup_ctrl = readl(OMAP34XX_CTRL_WKUP_CTRL);
299 debug("Turning %s %s\n", enable ? "on" : "off", p->name);
301 #ifdef CONFIG_MMC_OMAP36XX_PINS
302 if (get_cpu_family() == CPU_OMAP36XX) {
303 /* Disable extended drain IO before changing PBIAS */
304 wkup_ctrl &= ~OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ;
305 writel(wkup_ctrl, OMAP34XX_CTRL_WKUP_CTRL);
309 rc = pmic_read(dev->parent, 0, (uint8_t *)®, sizeof(reg));
313 reg &= ~p->enable_mask;
317 reg |= p->disable_val;
319 rc = pmic_write(dev->parent, 0, (uint8_t *)®, sizeof(reg));
321 #ifdef CONFIG_MMC_OMAP36XX_PINS
322 if (get_cpu_family() == CPU_OMAP36XX) {
323 /* Enable extended drain IO after changing PBIAS */
325 OMAP34XX_CTRL_WKUP_CTRL_GPIO_IO_PWRDNZ,
326 OMAP34XX_CTRL_WKUP_CTRL);
334 udelay(p->enable_time);
339 static const struct dm_regulator_ops pbias_regulator_ops = {
340 .get_value = pbias_regulator_get_value,
341 .set_value = pbias_regulator_set_value,
342 .get_enable = pbias_regulator_get_enable,
343 .set_enable = pbias_regulator_set_enable,
346 U_BOOT_DRIVER(pbias_regulator) = {
347 .name = "pbias_regulator",
348 .id = UCLASS_REGULATOR,
349 .ops = &pbias_regulator_ops,
350 .probe = pbias_regulator_probe,