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/*
* Rockchip IO Voltage Domain driver
*
* Copyright 2014 MundoReader S.L.
* Copyright 2014 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#define MAX_SUPPLIES 16
/*
* The max voltage for 1.8V and 3.3V come from the Rockchip datasheet under
* "Recommended Operating Conditions" for "Digital GPIO". When the typical
* is 3.3V the max is 3.6V. When the typical is 1.8V the max is 1.98V.
*
* They are used like this:
* - If the voltage on a rail is above the "1.8" voltage (1.98V) we'll tell the
* SoC we're at 3.3.
* - If the voltage on a rail is above the "3.3" voltage (3.6V) we'll consider
* that to be an error.
*/
#define MAX_VOLTAGE_1_8 1980000
#define MAX_VOLTAGE_3_3 3600000
#define RK3288_SOC_CON2 0x24c
#define RK3288_SOC_CON2_FLASH0 BIT(7)
#define RK3288_SOC_FLASH_SUPPLY_NUM 2
#define RK3328_SOC_CON4 0x410
#define RK3328_SOC_CON4_VCCIO2 BIT(7)
#define RK3328_SOC_VCCIO2_SUPPLY_NUM 1
#define RK3368_SOC_CON15 0x43c
#define RK3368_SOC_CON15_FLASH0 BIT(14)
#define RK3368_SOC_FLASH_SUPPLY_NUM 2
#define RK3399_PMUGRF_CON0 0x180
#define RK3399_PMUGRF_CON0_VSEL BIT(8)
#define RK3399_PMUGRF_VSEL_SUPPLY_NUM 9
struct rockchip_iodomain;
/**
* @supplies: voltage settings matching the register bits.
*/
struct rockchip_iodomain_soc_data {
int grf_offset;
const char *supply_names[MAX_SUPPLIES];
void (*init)(struct rockchip_iodomain *iod);
};
struct rockchip_iodomain_supply {
struct rockchip_iodomain *iod;
struct regulator *reg;
struct notifier_block nb;
int idx;
};
struct rockchip_iodomain {
struct device *dev;
struct regmap *grf;
struct rockchip_iodomain_soc_data *soc_data;
struct rockchip_iodomain_supply supplies[MAX_SUPPLIES];
};
static int rockchip_iodomain_write(struct rockchip_iodomain_supply *supply,
int uV)
{
struct rockchip_iodomain *iod = supply->iod;
u32 val;
int ret;
/* set value bit */
val = (uV > MAX_VOLTAGE_1_8) ? 0 : 1;
val <<= supply->idx;
/* apply hiword-mask */
val |= (BIT(supply->idx) << 16);
ret = regmap_write(iod->grf, iod->soc_data->grf_offset, val);
if (ret)
dev_err(iod->dev, "Couldn't write to GRF\n");
return ret;
}
static int rockchip_iodomain_notify(struct notifier_block *nb,
unsigned long event,
void *data)
{
struct rockchip_iodomain_supply *supply =
container_of(nb, struct rockchip_iodomain_supply, nb);
int uV;
int ret;
/*
* According to Rockchip it's important to keep the SoC IO domain
* higher than (or equal to) the external voltage. That means we need
* to change it before external voltage changes happen in the case
* of an increase.
*
* Note that in the "pre" change we pick the max possible voltage that
* the regulator might end up at (the client requests a range and we
* don't know for certain the exact voltage). Right now we rely on the
* slop in MAX_VOLTAGE_1_8 and MAX_VOLTAGE_3_3 to save us if clients
* request something like a max of 3.6V when they really want 3.3V.
* We could attempt to come up with better rules if this fails.
*/
if (event & REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) {
struct pre_voltage_change_data *pvc_data = data;
uV = max_t(unsigned long, pvc_data->old_uV, pvc_data->max_uV);
} else if (event & (REGULATOR_EVENT_VOLTAGE_CHANGE |
REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE)) {
uV = (unsigned long)data;
} else {
return NOTIFY_OK;
}
dev_dbg(supply->iod->dev, "Setting to %d\n", uV);
if (uV > MAX_VOLTAGE_3_3) {
dev_err(supply->iod->dev, "Voltage too high: %d\n", uV);
if (event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE)
return NOTIFY_BAD;
}
ret = rockchip_iodomain_write(supply, uV);
if (ret && event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE)
return NOTIFY_BAD;
dev_dbg(supply->iod->dev, "Setting to %d done\n", uV);
return NOTIFY_OK;
}
static void rk3288_iodomain_init(struct rockchip_iodomain *iod)
{
int ret;
u32 val;
/* if no flash supply we should leave things alone */
if (!iod->supplies[RK3288_SOC_FLASH_SUPPLY_NUM].reg)
return;
/*
* set flash0 iodomain to also use this framework
* instead of a special gpio.
*/
val = RK3288_SOC_CON2_FLASH0 | (RK3288_SOC_CON2_FLASH0 << 16);
ret = regmap_write(iod->grf, RK3288_SOC_CON2, val);
if (ret < 0)
dev_warn(iod->dev, "couldn't update flash0 ctrl\n");
}
static void rk3328_iodomain_init(struct rockchip_iodomain *iod)
{
int ret;
u32 val;
/* if no vccio2 supply we should leave things alone */
if (!iod->supplies[RK3328_SOC_VCCIO2_SUPPLY_NUM].reg)
return;
/*
* set vccio2 iodomain to also use this framework
* instead of a special gpio.
*/
val = RK3328_SOC_CON4_VCCIO2 | (RK3328_SOC_CON4_VCCIO2 << 16);
ret = regmap_write(iod->grf, RK3328_SOC_CON4, val);
if (ret < 0)
dev_warn(iod->dev, "couldn't update vccio2 vsel ctrl\n");
}
static void rk3368_iodomain_init(struct rockchip_iodomain *iod)
{
int ret;
u32 val;
/* if no flash supply we should leave things alone */
if (!iod->supplies[RK3368_SOC_FLASH_SUPPLY_NUM].reg)
return;
/*
* set flash0 iodomain to also use this framework
* instead of a special gpio.
*/
val = RK3368_SOC_CON15_FLASH0 | (RK3368_SOC_CON15_FLASH0 << 16);
ret = regmap_write(iod->grf, RK3368_SOC_CON15, val);
if (ret < 0)
dev_warn(iod->dev, "couldn't update flash0 ctrl\n");
}
static void rk3399_pmu_iodomain_init(struct rockchip_iodomain *iod)
{
int ret;
u32 val;
/* if no pmu io supply we should leave things alone */
if (!iod->supplies[RK3399_PMUGRF_VSEL_SUPPLY_NUM].reg)
return;
/*
* set pmu io iodomain to also use this framework
* instead of a special gpio.
*/
val = RK3399_PMUGRF_CON0_VSEL | (RK3399_PMUGRF_CON0_VSEL << 16);
ret = regmap_write(iod->grf, RK3399_PMUGRF_CON0, val);
if (ret < 0)
dev_warn(iod->dev, "couldn't update pmu io iodomain ctrl\n");
}
/*
* On the rk3188 the io-domains are handled by a shared register with the
* lower 8 bits being still being continuing drive-strength settings.
*/
static const struct rockchip_iodomain_soc_data soc_data_rk3188 = {
.grf_offset = 0x104,
.supply_names = {
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
"ap0",
"ap1",
"cif",
"flash",
"vccio0",
"vccio1",
"lcdc0",
"lcdc1",
},
};
static const struct rockchip_iodomain_soc_data soc_data_rk3228 = {
.grf_offset = 0x418,
.supply_names = {
"vccio1",
"vccio2",
"vccio3",
"vccio4",
},
};
static const struct rockchip_iodomain_soc_data soc_data_rk3288 = {
.grf_offset = 0x380,
.supply_names = {
"lcdc", /* LCDC_VDD */
"dvp", /* DVPIO_VDD */
"flash0", /* FLASH0_VDD (emmc) */
"flash1", /* FLASH1_VDD (sdio1) */
"wifi", /* APIO3_VDD (sdio0) */
"bb", /* APIO5_VDD */
"audio", /* APIO4_VDD */
"sdcard", /* SDMMC0_VDD (sdmmc) */
"gpio30", /* APIO1_VDD */
"gpio1830", /* APIO2_VDD */
},
.init = rk3288_iodomain_init,
};
static const struct rockchip_iodomain_soc_data soc_data_rk3328 = {
.grf_offset = 0x410,
.supply_names = {
"vccio1",
"vccio2",
"vccio3",
"vccio4",
"vccio5",
"vccio6",
"pmuio",
},
.init = rk3328_iodomain_init,
};
static const struct rockchip_iodomain_soc_data soc_data_rk3368 = {
.grf_offset = 0x900
|