2 * Rockchip IO Voltage Domain driver
4 * Copyright 2014 MundoReader S.L.
5 * Copyright 2014 Google, Inc.
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/err.h>
20 #include <linux/mfd/syscon.h>
22 #include <linux/platform_device.h>
23 #include <linux/regmap.h>
24 #include <linux/regulator/consumer.h>
26 #define MAX_SUPPLIES 16
29 * The max voltage for 1.8V and 3.3V come from the Rockchip datasheet under
30 * "Recommended Operating Conditions" for "Digital GPIO". When the typical
31 * is 3.3V the max is 3.6V. When the typical is 1.8V the max is 1.98V.
33 * They are used like this:
34 * - If the voltage on a rail is above the "1.8" voltage (1.98V) we'll tell the
36 * - If the voltage on a rail is above the "3.3" voltage (3.6V) we'll consider
37 * that to be an error.
39 #define MAX_VOLTAGE_1_8 1980000
40 #define MAX_VOLTAGE_3_3 3600000
42 #define RK3288_SOC_CON2 0x24c
43 #define RK3288_SOC_CON2_FLASH0 BIT(7)
44 #define RK3288_SOC_FLASH_SUPPLY_NUM 2
46 #define RK3328_SOC_CON4 0x410
47 #define RK3328_SOC_CON4_VCCIO2 BIT(7)
48 #define RK3328_SOC_VCCIO2_SUPPLY_NUM 1
50 #define RK3368_SOC_CON15 0x43c
51 #define RK3368_SOC_CON15_FLASH0 BIT(14)
52 #define RK3368_SOC_FLASH_SUPPLY_NUM 2
54 #define RK3399_PMUGRF_CON0 0x180
55 #define RK3399_PMUGRF_CON0_VSEL BIT(8)
56 #define RK3399_PMUGRF_VSEL_SUPPLY_NUM 9
58 struct rockchip_iodomain;
61 * @supplies: voltage settings matching the register bits.
63 struct rockchip_iodomain_soc_data {
65 const char *supply_names[MAX_SUPPLIES];
66 void (*init)(struct rockchip_iodomain *iod);
69 struct rockchip_iodomain_supply {
70 struct rockchip_iodomain *iod;
71 struct regulator *reg;
72 struct notifier_block nb;
76 struct rockchip_iodomain {
79 struct rockchip_iodomain_soc_data *soc_data;
80 struct rockchip_iodomain_supply supplies[MAX_SUPPLIES];
83 static int rockchip_iodomain_write(struct rockchip_iodomain_supply *supply,
86 struct rockchip_iodomain *iod = supply->iod;
91 val = (uV > MAX_VOLTAGE_1_8) ? 0 : 1;
94 /* apply hiword-mask */
95 val |= (BIT(supply->idx) << 16);
97 ret = regmap_write(iod->grf, iod->soc_data->grf_offset, val);
99 dev_err(iod->dev, "Couldn't write to GRF\n");
104 static int rockchip_iodomain_notify(struct notifier_block *nb,
108 struct rockchip_iodomain_supply *supply =
109 container_of(nb, struct rockchip_iodomain_supply, nb);
114 * According to Rockchip it's important to keep the SoC IO domain
115 * higher than (or equal to) the external voltage. That means we need
116 * to change it before external voltage changes happen in the case
119 * Note that in the "pre" change we pick the max possible voltage that
120 * the regulator might end up at (the client requests a range and we
121 * don't know for certain the exact voltage). Right now we rely on the
122 * slop in MAX_VOLTAGE_1_8 and MAX_VOLTAGE_3_3 to save us if clients
123 * request something like a max of 3.6V when they really want 3.3V.
124 * We could attempt to come up with better rules if this fails.
126 if (event & REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) {
127 struct pre_voltage_change_data *pvc_data = data;
129 uV = max_t(unsigned long, pvc_data->old_uV, pvc_data->max_uV);
130 } else if (event & (REGULATOR_EVENT_VOLTAGE_CHANGE |
131 REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE)) {
132 uV = (unsigned long)data;
137 dev_dbg(supply->iod->dev, "Setting to %d\n", uV);
139 if (uV > MAX_VOLTAGE_3_3) {
140 dev_err(supply->iod->dev, "Voltage too high: %d\n", uV);
142 if (event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE)
146 ret = rockchip_iodomain_write(supply, uV);
147 if (ret && event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE)
150 dev_dbg(supply->iod->dev, "Setting to %d done\n", uV);
154 static void rk3288_iodomain_init(struct rockchip_iodomain *iod)
159 /* if no flash supply we should leave things alone */
160 if (!iod->supplies[RK3288_SOC_FLASH_SUPPLY_NUM].reg)
164 * set flash0 iodomain to also use this framework
165 * instead of a special gpio.
167 val = RK3288_SOC_CON2_FLASH0 | (RK3288_SOC_CON2_FLASH0 << 16);
168 ret = regmap_write(iod->grf, RK3288_SOC_CON2, val);
170 dev_warn(iod->dev, "couldn't update flash0 ctrl\n");
173 static void rk3328_iodomain_init(struct rockchip_iodomain *iod)
178 /* if no vccio2 supply we should leave things alone */
179 if (!iod->supplies[RK3328_SOC_VCCIO2_SUPPLY_NUM].reg)
183 * set vccio2 iodomain to also use this framework
184 * instead of a special gpio.
186 val = RK3328_SOC_CON4_VCCIO2 | (RK3328_SOC_CON4_VCCIO2 << 16);
187 ret = regmap_write(iod->grf, RK3328_SOC_CON4, val);
189 dev_warn(iod->dev, "couldn't update vccio2 vsel ctrl\n");
192 static void rk3368_iodomain_init(struct rockchip_iodomain *iod)
197 /* if no flash supply we should leave things alone */
198 if (!iod->supplies[RK3368_SOC_FLASH_SUPPLY_NUM].reg)
202 * set flash0 iodomain to also use this framework
203 * instead of a special gpio.
205 val = RK3368_SOC_CON15_FLASH0 | (RK3368_SOC_CON15_FLASH0 << 16);
206 ret = regmap_write(iod->grf, RK3368_SOC_CON15, val);
208 dev_warn(iod->dev, "couldn't update flash0 ctrl\n");
211 static void rk3399_pmu_iodomain_init(struct rockchip_iodomain *iod)
216 /* if no pmu io supply we should leave things alone */
217 if (!iod->supplies[RK3399_PMUGRF_VSEL_SUPPLY_NUM].reg)
221 * set pmu io iodomain to also use this framework
222 * instead of a special gpio.
224 val = RK3399_PMUGRF_CON0_VSEL | (RK3399_PMUGRF_CON0_VSEL << 16);
225 ret = regmap_write(iod->grf, RK3399_PMUGRF_CON0, val);
227 dev_warn(iod->dev, "couldn't update pmu io iodomain ctrl\n");
231 * On the rk3188 the io-domains are handled by a shared register with the
232 * lower 8 bits being still being continuing drive-strength settings.
234 static const struct rockchip_iodomain_soc_data soc_data_rk3188 = {
256 static const struct rockchip_iodomain_soc_data soc_data_rk3288 = {
259 "lcdc", /* LCDC_VDD */
260 "dvp", /* DVPIO_VDD */
261 "flash0", /* FLASH0_VDD (emmc) */
262 "flash1", /* FLASH1_VDD (sdio1) */
263 "wifi", /* APIO3_VDD (sdio0) */
264 "bb", /* APIO5_VDD */
265 "audio", /* APIO4_VDD */
266 "sdcard", /* SDMMC0_VDD (sdmmc) */
267 "gpio30", /* APIO1_VDD */
268 "gpio1830", /* APIO2_VDD */
270 .init = rk3288_iodomain_init,
273 static const struct rockchip_iodomain_soc_data soc_data_rk3328 = {
284 .init = rk3328_iodomain_init,
287 static const struct rockchip_iodomain_soc_data soc_data_rk3368 = {
291 "dvp", /* DVPIO_VDD */
292 "flash0", /* FLASH0_VDD (emmc) */
293 "wifi", /* APIO2_VDD (sdio0) */
295 "audio", /* APIO3_VDD */
296 "sdcard", /* SDMMC0_VDD (sdmmc) */
297 "gpio30", /* APIO1_VDD */
298 "gpio1830", /* APIO4_VDD (gpujtag) */
300 .init = rk3368_iodomain_init,
303 static const struct rockchip_iodomain_soc_data soc_data_rk3368_pmu = {
310 "pmu", /*PMU IO domain*/
311 "vop", /*LCDC IO domain*/
315 static const struct rockchip_iodomain_soc_data soc_data_rk3399 = {
316 .grf_offset = 0xe640,
318 "bt656", /* APIO2_VDD */
319 "audio", /* APIO5_VDD */
320 "sdmmc", /* SDMMC0_VDD */
321 "gpio1830", /* APIO4_VDD */
325 static const struct rockchip_iodomain_soc_data soc_data_rk3399_pmu = {
337 "pmu1830", /* PMUIO2_VDD */
339 .init = rk3399_pmu_iodomain_init,
342 static const struct of_device_id rockchip_iodomain_match[] = {
344 .compatible = "rockchip,rk3188-io-voltage-domain",
345 .data = (void *)&soc_data_rk3188
348 .compatible = "rockchip,rk3288-io-voltage-domain",
349 .data = (void *)&soc_data_rk3288
352 .compatible = "rockchip,rk3328-io-voltage-domain",
353 .data = (void *)&soc_data_rk3328
356 .compatible = "rockchip,rk3368-io-voltage-domain",
357 .data = (void *)&soc_data_rk3368
360 .compatible = "rockchip,rk3368-pmu-io-voltage-domain",
361 .data = (void *)&soc_data_rk3368_pmu
364 .compatible = "rockchip,rk3399-io-voltage-domain",
365 .data = (void *)&soc_data_rk3399
368 .compatible = "rockchip,rk3399-pmu-io-voltage-domain",
369 .data = (void *)&soc_data_rk3399_pmu
373 MODULE_DEVICE_TABLE(of, rockchip_iodomain_match);
375 static int rockchip_iodomain_probe(struct platform_device *pdev)
377 struct device_node *np = pdev->dev.of_node;
378 const struct of_device_id *match;
379 struct rockchip_iodomain *iod;
380 struct device *parent;
386 iod = devm_kzalloc(&pdev->dev, sizeof(*iod), GFP_KERNEL);
390 iod->dev = &pdev->dev;
391 platform_set_drvdata(pdev, iod);
393 match = of_match_node(rockchip_iodomain_match, np);
394 iod->soc_data = (struct rockchip_iodomain_soc_data *)match->data;
396 parent = pdev->dev.parent;
397 if (parent && parent->of_node) {
398 iod->grf = syscon_node_to_regmap(parent->of_node);
400 dev_dbg(&pdev->dev, "falling back to old binding\n");
401 iod->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
404 if (IS_ERR(iod->grf)) {
405 dev_err(&pdev->dev, "couldn't find grf regmap\n");
406 return PTR_ERR(iod->grf);
409 for (i = 0; i < MAX_SUPPLIES; i++) {
410 const char *supply_name = iod->soc_data->supply_names[i];
411 struct rockchip_iodomain_supply *supply = &iod->supplies[i];
412 struct regulator *reg;
418 reg = devm_regulator_get_optional(iod->dev, supply_name);
422 /* If a supply wasn't specified, that's OK */
425 else if (ret != -EPROBE_DEFER)
426 dev_err(iod->dev, "couldn't get regulator %s\n",
431 /* set initial correct value */
432 uV = regulator_get_voltage(reg);
434 /* must be a regulator we can get the voltage of */
436 dev_err(iod->dev, "Can't determine voltage: %s\n",
441 if (uV > MAX_VOLTAGE_3_3) {
443 "%d uV is too high. May damage SoC!\n",
449 /* setup our supply */
453 supply->nb.notifier_call = rockchip_iodomain_notify;
455 ret = rockchip_iodomain_write(supply, uV);
461 /* register regulator notifier */
462 ret = regulator_register_notifier(reg, &supply->nb);
465 "regulator notifier request failed\n");
471 if (iod->soc_data->init)
472 iod->soc_data->init(iod);
477 for (i = MAX_SUPPLIES - 1; i >= 0; i--) {
478 struct rockchip_iodomain_supply *io_supply = &iod->supplies[i];
481 regulator_unregister_notifier(io_supply->reg,
488 static int rockchip_iodomain_remove(struct platform_device *pdev)
490 struct rockchip_iodomain *iod = platform_get_drvdata(pdev);
493 for (i = MAX_SUPPLIES - 1; i >= 0; i--) {
494 struct rockchip_iodomain_supply *io_supply = &iod->supplies[i];
497 regulator_unregister_notifier(io_supply->reg,
504 static struct platform_driver rockchip_iodomain_driver = {
505 .probe = rockchip_iodomain_probe,
506 .remove = rockchip_iodomain_remove,
508 .name = "rockchip-iodomain",
509 .of_match_table = rockchip_iodomain_match,
513 module_platform_driver(rockchip_iodomain_driver);
515 MODULE_DESCRIPTION("Rockchip IO-domain driver");
516 MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
517 MODULE_AUTHOR("Doug Anderson <dianders@chromium.org>");
518 MODULE_LICENSE("GPL v2");