b8281fa71d
This adds the necessary data for handling io voltage domains on PX30. As interesting tidbit, the PX30 contains two separate iodomain areas. One in the regular General Register Files (GRF) and one in PMUGRF in the pmu power domain. Signed-off-by: David Wu <david.wu@rock-chips.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
639 lines
15 KiB
C
639 lines
15 KiB
C
/*
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* Rockchip IO Voltage Domain driver
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*
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* Copyright 2014 MundoReader S.L.
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* Copyright 2014 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#define MAX_SUPPLIES 16
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/*
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* The max voltage for 1.8V and 3.3V come from the Rockchip datasheet under
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* "Recommended Operating Conditions" for "Digital GPIO". When the typical
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* is 3.3V the max is 3.6V. When the typical is 1.8V the max is 1.98V.
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*
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* They are used like this:
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* - If the voltage on a rail is above the "1.8" voltage (1.98V) we'll tell the
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* SoC we're at 3.3.
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* - If the voltage on a rail is above the "3.3" voltage (3.6V) we'll consider
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* that to be an error.
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*/
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#define MAX_VOLTAGE_1_8 1980000
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#define MAX_VOLTAGE_3_3 3600000
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#define PX30_IO_VSEL 0x180
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#define PX30_IO_VSEL_VCCIO6_SRC BIT(0)
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#define PX30_IO_VSEL_VCCIO6_SUPPLY_NUM 1
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#define RK3288_SOC_CON2 0x24c
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#define RK3288_SOC_CON2_FLASH0 BIT(7)
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#define RK3288_SOC_FLASH_SUPPLY_NUM 2
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#define RK3328_SOC_CON4 0x410
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#define RK3328_SOC_CON4_VCCIO2 BIT(7)
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#define RK3328_SOC_VCCIO2_SUPPLY_NUM 1
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#define RK3368_SOC_CON15 0x43c
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#define RK3368_SOC_CON15_FLASH0 BIT(14)
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#define RK3368_SOC_FLASH_SUPPLY_NUM 2
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#define RK3399_PMUGRF_CON0 0x180
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#define RK3399_PMUGRF_CON0_VSEL BIT(8)
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#define RK3399_PMUGRF_VSEL_SUPPLY_NUM 9
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struct rockchip_iodomain;
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/**
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* @supplies: voltage settings matching the register bits.
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*/
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struct rockchip_iodomain_soc_data {
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int grf_offset;
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const char *supply_names[MAX_SUPPLIES];
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void (*init)(struct rockchip_iodomain *iod);
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};
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struct rockchip_iodomain_supply {
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struct rockchip_iodomain *iod;
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struct regulator *reg;
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struct notifier_block nb;
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int idx;
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};
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struct rockchip_iodomain {
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struct device *dev;
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struct regmap *grf;
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const struct rockchip_iodomain_soc_data *soc_data;
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struct rockchip_iodomain_supply supplies[MAX_SUPPLIES];
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};
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static int rockchip_iodomain_write(struct rockchip_iodomain_supply *supply,
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int uV)
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{
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struct rockchip_iodomain *iod = supply->iod;
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u32 val;
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int ret;
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/* set value bit */
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val = (uV > MAX_VOLTAGE_1_8) ? 0 : 1;
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val <<= supply->idx;
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/* apply hiword-mask */
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val |= (BIT(supply->idx) << 16);
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ret = regmap_write(iod->grf, iod->soc_data->grf_offset, val);
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if (ret)
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dev_err(iod->dev, "Couldn't write to GRF\n");
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return ret;
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}
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static int rockchip_iodomain_notify(struct notifier_block *nb,
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unsigned long event,
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void *data)
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{
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struct rockchip_iodomain_supply *supply =
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container_of(nb, struct rockchip_iodomain_supply, nb);
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int uV;
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int ret;
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/*
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* According to Rockchip it's important to keep the SoC IO domain
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* higher than (or equal to) the external voltage. That means we need
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* to change it before external voltage changes happen in the case
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* of an increase.
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*
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* Note that in the "pre" change we pick the max possible voltage that
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* the regulator might end up at (the client requests a range and we
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* don't know for certain the exact voltage). Right now we rely on the
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* slop in MAX_VOLTAGE_1_8 and MAX_VOLTAGE_3_3 to save us if clients
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* request something like a max of 3.6V when they really want 3.3V.
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* We could attempt to come up with better rules if this fails.
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*/
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if (event & REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) {
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struct pre_voltage_change_data *pvc_data = data;
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uV = max_t(unsigned long, pvc_data->old_uV, pvc_data->max_uV);
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} else if (event & (REGULATOR_EVENT_VOLTAGE_CHANGE |
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REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE)) {
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uV = (unsigned long)data;
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} else {
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return NOTIFY_OK;
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}
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dev_dbg(supply->iod->dev, "Setting to %d\n", uV);
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if (uV > MAX_VOLTAGE_3_3) {
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dev_err(supply->iod->dev, "Voltage too high: %d\n", uV);
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if (event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE)
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return NOTIFY_BAD;
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}
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ret = rockchip_iodomain_write(supply, uV);
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if (ret && event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE)
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return NOTIFY_BAD;
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dev_dbg(supply->iod->dev, "Setting to %d done\n", uV);
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return NOTIFY_OK;
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}
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static void px30_iodomain_init(struct rockchip_iodomain *iod)
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{
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int ret;
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u32 val;
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/* if no VCCIO0 supply we should leave things alone */
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if (!iod->supplies[PX30_IO_VSEL_VCCIO6_SUPPLY_NUM].reg)
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return;
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/*
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* set vccio0 iodomain to also use this framework
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* instead of a special gpio.
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*/
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val = PX30_IO_VSEL_VCCIO6_SRC | (PX30_IO_VSEL_VCCIO6_SRC << 16);
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ret = regmap_write(iod->grf, PX30_IO_VSEL, val);
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if (ret < 0)
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dev_warn(iod->dev, "couldn't update vccio0 ctrl\n");
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}
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static void rk3288_iodomain_init(struct rockchip_iodomain *iod)
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{
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int ret;
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u32 val;
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/* if no flash supply we should leave things alone */
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if (!iod->supplies[RK3288_SOC_FLASH_SUPPLY_NUM].reg)
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return;
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/*
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* set flash0 iodomain to also use this framework
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* instead of a special gpio.
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*/
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val = RK3288_SOC_CON2_FLASH0 | (RK3288_SOC_CON2_FLASH0 << 16);
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ret = regmap_write(iod->grf, RK3288_SOC_CON2, val);
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if (ret < 0)
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dev_warn(iod->dev, "couldn't update flash0 ctrl\n");
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}
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static void rk3328_iodomain_init(struct rockchip_iodomain *iod)
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{
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int ret;
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u32 val;
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/* if no vccio2 supply we should leave things alone */
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if (!iod->supplies[RK3328_SOC_VCCIO2_SUPPLY_NUM].reg)
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return;
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/*
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* set vccio2 iodomain to also use this framework
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* instead of a special gpio.
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*/
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val = RK3328_SOC_CON4_VCCIO2 | (RK3328_SOC_CON4_VCCIO2 << 16);
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ret = regmap_write(iod->grf, RK3328_SOC_CON4, val);
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if (ret < 0)
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dev_warn(iod->dev, "couldn't update vccio2 vsel ctrl\n");
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}
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static void rk3368_iodomain_init(struct rockchip_iodomain *iod)
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{
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int ret;
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u32 val;
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/* if no flash supply we should leave things alone */
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if (!iod->supplies[RK3368_SOC_FLASH_SUPPLY_NUM].reg)
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return;
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/*
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* set flash0 iodomain to also use this framework
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* instead of a special gpio.
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*/
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val = RK3368_SOC_CON15_FLASH0 | (RK3368_SOC_CON15_FLASH0 << 16);
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ret = regmap_write(iod->grf, RK3368_SOC_CON15, val);
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if (ret < 0)
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dev_warn(iod->dev, "couldn't update flash0 ctrl\n");
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}
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static void rk3399_pmu_iodomain_init(struct rockchip_iodomain *iod)
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{
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int ret;
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u32 val;
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/* if no pmu io supply we should leave things alone */
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if (!iod->supplies[RK3399_PMUGRF_VSEL_SUPPLY_NUM].reg)
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return;
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/*
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* set pmu io iodomain to also use this framework
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* instead of a special gpio.
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*/
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val = RK3399_PMUGRF_CON0_VSEL | (RK3399_PMUGRF_CON0_VSEL << 16);
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ret = regmap_write(iod->grf, RK3399_PMUGRF_CON0, val);
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if (ret < 0)
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dev_warn(iod->dev, "couldn't update pmu io iodomain ctrl\n");
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}
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static const struct rockchip_iodomain_soc_data soc_data_px30 = {
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.grf_offset = 0x180,
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.supply_names = {
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NULL,
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"vccio6",
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"vccio1",
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"vccio2",
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"vccio3",
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"vccio4",
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"vccio5",
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"vccio-oscgpi",
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},
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.init = px30_iodomain_init,
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};
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static const struct rockchip_iodomain_soc_data soc_data_px30_pmu = {
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.grf_offset = 0x100,
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.supply_names = {
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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"pmuio1",
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"pmuio2",
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},
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};
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/*
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* On the rk3188 the io-domains are handled by a shared register with the
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* lower 8 bits being still being continuing drive-strength settings.
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*/
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static const struct rockchip_iodomain_soc_data soc_data_rk3188 = {
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.grf_offset = 0x104,
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.supply_names = {
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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"ap0",
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"ap1",
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"cif",
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"flash",
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"vccio0",
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"vccio1",
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"lcdc0",
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"lcdc1",
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},
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};
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static const struct rockchip_iodomain_soc_data soc_data_rk3228 = {
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.grf_offset = 0x418,
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.supply_names = {
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"vccio1",
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"vccio2",
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"vccio3",
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"vccio4",
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},
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};
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static const struct rockchip_iodomain_soc_data soc_data_rk3288 = {
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.grf_offset = 0x380,
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.supply_names = {
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"lcdc", /* LCDC_VDD */
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"dvp", /* DVPIO_VDD */
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"flash0", /* FLASH0_VDD (emmc) */
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"flash1", /* FLASH1_VDD (sdio1) */
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"wifi", /* APIO3_VDD (sdio0) */
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"bb", /* APIO5_VDD */
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"audio", /* APIO4_VDD */
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"sdcard", /* SDMMC0_VDD (sdmmc) */
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"gpio30", /* APIO1_VDD */
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"gpio1830", /* APIO2_VDD */
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},
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.init = rk3288_iodomain_init,
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};
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static const struct rockchip_iodomain_soc_data soc_data_rk3328 = {
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.grf_offset = 0x410,
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.supply_names = {
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"vccio1",
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"vccio2",
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"vccio3",
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"vccio4",
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"vccio5",
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"vccio6",
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"pmuio",
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},
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.init = rk3328_iodomain_init,
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};
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static const struct rockchip_iodomain_soc_data soc_data_rk3368 = {
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.grf_offset = 0x900,
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.supply_names = {
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NULL, /* reserved */
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"dvp", /* DVPIO_VDD */
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"flash0", /* FLASH0_VDD (emmc) */
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"wifi", /* APIO2_VDD (sdio0) */
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NULL,
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"audio", /* APIO3_VDD */
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"sdcard", /* SDMMC0_VDD (sdmmc) */
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"gpio30", /* APIO1_VDD */
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"gpio1830", /* APIO4_VDD (gpujtag) */
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},
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.init = rk3368_iodomain_init,
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};
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static const struct rockchip_iodomain_soc_data soc_data_rk3368_pmu = {
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.grf_offset = 0x100,
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.supply_names = {
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NULL,
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NULL,
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NULL,
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NULL,
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"pmu", /*PMU IO domain*/
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"vop", /*LCDC IO domain*/
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},
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};
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static const struct rockchip_iodomain_soc_data soc_data_rk3399 = {
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.grf_offset = 0xe640,
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.supply_names = {
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"bt656", /* APIO2_VDD */
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"audio", /* APIO5_VDD */
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"sdmmc", /* SDMMC0_VDD */
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"gpio1830", /* APIO4_VDD */
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},
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};
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static const struct rockchip_iodomain_soc_data soc_data_rk3399_pmu = {
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.grf_offset = 0x180,
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.supply_names = {
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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"pmu1830", /* PMUIO2_VDD */
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},
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.init = rk3399_pmu_iodomain_init,
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};
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static const struct rockchip_iodomain_soc_data soc_data_rv1108 = {
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.grf_offset = 0x404,
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.supply_names = {
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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"vccio1",
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"vccio2",
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"vccio3",
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"vccio5",
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"vccio6",
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},
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};
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static const struct rockchip_iodomain_soc_data soc_data_rv1108_pmu = {
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.grf_offset = 0x104,
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.supply_names = {
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"pmu",
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},
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};
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static const struct of_device_id rockchip_iodomain_match[] = {
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{
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.compatible = "rockchip,px30-io-voltage-domain",
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.data = (void *)&soc_data_px30
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},
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{
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.compatible = "rockchip,px30-pmu-io-voltage-domain",
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.data = (void *)&soc_data_px30_pmu
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},
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{
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.compatible = "rockchip,rk3188-io-voltage-domain",
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.data = &soc_data_rk3188
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},
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{
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.compatible = "rockchip,rk3228-io-voltage-domain",
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.data = &soc_data_rk3228
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},
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{
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.compatible = "rockchip,rk3288-io-voltage-domain",
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.data = &soc_data_rk3288
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},
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{
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.compatible = "rockchip,rk3328-io-voltage-domain",
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.data = &soc_data_rk3328
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},
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{
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.compatible = "rockchip,rk3368-io-voltage-domain",
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.data = &soc_data_rk3368
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},
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{
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.compatible = "rockchip,rk3368-pmu-io-voltage-domain",
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.data = &soc_data_rk3368_pmu
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},
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{
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.compatible = "rockchip,rk3399-io-voltage-domain",
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.data = &soc_data_rk3399
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},
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{
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.compatible = "rockchip,rk3399-pmu-io-voltage-domain",
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.data = &soc_data_rk3399_pmu
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},
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{
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.compatible = "rockchip,rv1108-io-voltage-domain",
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.data = &soc_data_rv1108
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},
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{
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.compatible = "rockchip,rv1108-pmu-io-voltage-domain",
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.data = &soc_data_rv1108_pmu
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},
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, rockchip_iodomain_match);
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static int rockchip_iodomain_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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const struct of_device_id *match;
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struct rockchip_iodomain *iod;
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struct device *parent;
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int i, ret = 0;
|
|
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
iod = devm_kzalloc(&pdev->dev, sizeof(*iod), GFP_KERNEL);
|
|
if (!iod)
|
|
return -ENOMEM;
|
|
|
|
iod->dev = &pdev->dev;
|
|
platform_set_drvdata(pdev, iod);
|
|
|
|
match = of_match_node(rockchip_iodomain_match, np);
|
|
iod->soc_data = match->data;
|
|
|
|
parent = pdev->dev.parent;
|
|
if (parent && parent->of_node) {
|
|
iod->grf = syscon_node_to_regmap(parent->of_node);
|
|
} else {
|
|
dev_dbg(&pdev->dev, "falling back to old binding\n");
|
|
iod->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
|
|
}
|
|
|
|
if (IS_ERR(iod->grf)) {
|
|
dev_err(&pdev->dev, "couldn't find grf regmap\n");
|
|
return PTR_ERR(iod->grf);
|
|
}
|
|
|
|
for (i = 0; i < MAX_SUPPLIES; i++) {
|
|
const char *supply_name = iod->soc_data->supply_names[i];
|
|
struct rockchip_iodomain_supply *supply = &iod->supplies[i];
|
|
struct regulator *reg;
|
|
int uV;
|
|
|
|
if (!supply_name)
|
|
continue;
|
|
|
|
reg = devm_regulator_get_optional(iod->dev, supply_name);
|
|
if (IS_ERR(reg)) {
|
|
ret = PTR_ERR(reg);
|
|
|
|
/* If a supply wasn't specified, that's OK */
|
|
if (ret == -ENODEV)
|
|
continue;
|
|
else if (ret != -EPROBE_DEFER)
|
|
dev_err(iod->dev, "couldn't get regulator %s\n",
|
|
supply_name);
|
|
goto unreg_notify;
|
|
}
|
|
|
|
/* set initial correct value */
|
|
uV = regulator_get_voltage(reg);
|
|
|
|
/* must be a regulator we can get the voltage of */
|
|
if (uV < 0) {
|
|
dev_err(iod->dev, "Can't determine voltage: %s\n",
|
|
supply_name);
|
|
goto unreg_notify;
|
|
}
|
|
|
|
if (uV > MAX_VOLTAGE_3_3) {
|
|
dev_crit(iod->dev,
|
|
"%d uV is too high. May damage SoC!\n",
|
|
uV);
|
|
ret = -EINVAL;
|
|
goto unreg_notify;
|
|
}
|
|
|
|
/* setup our supply */
|
|
supply->idx = i;
|
|
supply->iod = iod;
|
|
supply->reg = reg;
|
|
supply->nb.notifier_call = rockchip_iodomain_notify;
|
|
|
|
ret = rockchip_iodomain_write(supply, uV);
|
|
if (ret) {
|
|
supply->reg = NULL;
|
|
goto unreg_notify;
|
|
}
|
|
|
|
/* register regulator notifier */
|
|
ret = regulator_register_notifier(reg, &supply->nb);
|
|
if (ret) {
|
|
dev_err(&pdev->dev,
|
|
"regulator notifier request failed\n");
|
|
supply->reg = NULL;
|
|
goto unreg_notify;
|
|
}
|
|
}
|
|
|
|
if (iod->soc_data->init)
|
|
iod->soc_data->init(iod);
|
|
|
|
return 0;
|
|
|
|
unreg_notify:
|
|
for (i = MAX_SUPPLIES - 1; i >= 0; i--) {
|
|
struct rockchip_iodomain_supply *io_supply = &iod->supplies[i];
|
|
|
|
if (io_supply->reg)
|
|
regulator_unregister_notifier(io_supply->reg,
|
|
&io_supply->nb);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rockchip_iodomain_remove(struct platform_device *pdev)
|
|
{
|
|
struct rockchip_iodomain *iod = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
for (i = MAX_SUPPLIES - 1; i >= 0; i--) {
|
|
struct rockchip_iodomain_supply *io_supply = &iod->supplies[i];
|
|
|
|
if (io_supply->reg)
|
|
regulator_unregister_notifier(io_supply->reg,
|
|
&io_supply->nb);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver rockchip_iodomain_driver = {
|
|
.probe = rockchip_iodomain_probe,
|
|
.remove = rockchip_iodomain_remove,
|
|
.driver = {
|
|
.name = "rockchip-iodomain",
|
|
.of_match_table = rockchip_iodomain_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(rockchip_iodomain_driver);
|
|
|
|
MODULE_DESCRIPTION("Rockchip IO-domain driver");
|
|
MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
|
|
MODULE_AUTHOR("Doug Anderson <dianders@chromium.org>");
|
|
MODULE_LICENSE("GPL v2");
|