Commit de85d79f authored by Hans de Goede's avatar Hans de Goede Committed by Lee Jones

mfd: Add Cherry Trail Whiskey Cove PMIC driver

Add mfd driver for Intel CHT Whiskey Cove PMIC, based on various non
upstreamed CHT Whiskey Cove PMIC patches.

This is a somewhat minimal version which adds irqchip support and cells
for: ACPI PMIC opregion support, the i2c-controller driving the external
charger irc and the pwrsrc/extcon block.

Further cells can be added in the future if/when drivers are upstreamed
for them.

[The above patch caused a build error on some archetectures]

From: Arnd Bergmann <arnd@arndb.de>

I ran into a build error on ARM with a platform that has a non-standard
clk implementation:

drivers/clk/clk.o: In function `clk_disable':
clk.c:(.text.clk_disable+0x0): multiple definition of `clk_disable'
arch/arm/mach-omap1/clock.o:clock.c:(.text.clk_disable+0x0): first defined here
drivers/clk/clk.o: In function `clk_enable':
clk.c:(.text.clk_enable+0x0): multiple definition of `clk_enable'
arch/arm/mach-omap1/clock.o:clock.c:(.text.clk_enable+0x0): first defined here

The problem is a device driver that uses 'select COMMON_CLK', which is
generally a bad idea: selecting a subsystem should only be done from
a platform, otherwise we run into circular dependencies. The same driver
also selects 'GPIOLIB' and 'I2C', which has a similar effect.

This turns all three into 'depends on', as it should be.

Finally, we can limit the build to x86, unless we are compile testing.

First patch:
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>

Fix for first patch (squashed):
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent b6678050
......@@ -475,6 +475,22 @@ config INTEL_SOC_PMIC_BXTWC
thermal, charger and related power management functions
on these systems.
config INTEL_SOC_PMIC_CHTWC
tristate "Support for Intel Cherry Trail Whiskey Cove PMIC"
depends on ACPI && HAS_IOMEM && I2C=y && COMMON_CLK
depends on X86 || COMPILE_TEST
select MFD_CORE
select REGMAP_I2C
select REGMAP_IRQ
select I2C_DESIGNWARE_PLATFORM
help
Select this option to enable support for the Intel Cherry Trail
Whiskey Cove PMIC found on some Intel Cherry Trail systems.
This option is a bool as it provides an ACPI OpRegion which must be
available before any devices using it are probed. This option also
causes the designware-i2c driver to be builtin for the same reason.
config MFD_INTEL_LPSS
tristate
select COMMON_CLK
......
......@@ -214,6 +214,7 @@ obj-$(CONFIG_MFD_SKY81452) += sky81452.o
intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
obj-$(CONFIG_INTEL_SOC_PMIC_BXTWC) += intel_soc_pmic_bxtwc.o
obj-$(CONFIG_INTEL_SOC_PMIC_CHTWC) += intel_soc_pmic_chtwc.o
obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
obj-$(CONFIG_MFD_ALTERA_A10SR) += altera-a10sr.o
......
/*
* MFD core driver for Intel Cherrytrail Whiskey Cove PMIC
*
* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
*
* Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
* Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/regmap.h>
/* PMIC device registers */
#define REG_OFFSET_MASK GENMASK(7, 0)
#define REG_ADDR_MASK GENMASK(15, 8)
#define REG_ADDR_SHIFT 8
#define CHT_WC_IRQLVL1 0x6e02
#define CHT_WC_IRQLVL1_MASK 0x6e0e
/* Whiskey Cove PMIC share same ACPI ID between different platforms */
#define CHT_WC_HRV 3
/* Level 1 IRQs (level 2 IRQs are handled in the child device drivers) */
enum {
CHT_WC_PWRSRC_IRQ = 0,
CHT_WC_THRM_IRQ,
CHT_WC_BCU_IRQ,
CHT_WC_ADC_IRQ,
CHT_WC_EXT_CHGR_IRQ,
CHT_WC_GPIO_IRQ,
/* There is no irq 6 */
CHT_WC_CRIT_IRQ = 7,
};
static struct resource cht_wc_pwrsrc_resources[] = {
DEFINE_RES_IRQ(CHT_WC_PWRSRC_IRQ),
};
static struct resource cht_wc_ext_charger_resources[] = {
DEFINE_RES_IRQ(CHT_WC_EXT_CHGR_IRQ),
};
static struct mfd_cell cht_wc_dev[] = {
{
.name = "cht_wcove_pwrsrc",
.num_resources = ARRAY_SIZE(cht_wc_pwrsrc_resources),
.resources = cht_wc_pwrsrc_resources,
}, {
.name = "cht_wcove_ext_chgr",
.num_resources = ARRAY_SIZE(cht_wc_ext_charger_resources),
.resources = cht_wc_ext_charger_resources,
},
{ .name = "cht_wcove_region", },
};
/*
* The CHT Whiskey Cove covers multiple I2C addresses, with a 1 Byte
* register address space per I2C address, so we use 16 bit register
* addresses where the high 8 bits contain the I2C client address.
*/
static int cht_wc_byte_reg_read(void *context, unsigned int reg,
unsigned int *val)
{
struct i2c_client *client = context;
int ret, orig_addr = client->addr;
if (!(reg & REG_ADDR_MASK)) {
dev_err(&client->dev, "Error I2C address not specified\n");
return -EINVAL;
}
client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
ret = i2c_smbus_read_byte_data(client, reg & REG_OFFSET_MASK);
client->addr = orig_addr;
if (ret < 0)
return ret;
*val = ret;
return 0;
}
static int cht_wc_byte_reg_write(void *context, unsigned int reg,
unsigned int val)
{
struct i2c_client *client = context;
int ret, orig_addr = client->addr;
if (!(reg & REG_ADDR_MASK)) {
dev_err(&client->dev, "Error I2C address not specified\n");
return -EINVAL;
}
client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
ret = i2c_smbus_write_byte_data(client, reg & REG_OFFSET_MASK, val);
client->addr = orig_addr;
return ret;
}
static const struct regmap_config cht_wc_regmap_cfg = {
.reg_bits = 16,
.val_bits = 8,
.reg_write = cht_wc_byte_reg_write,
.reg_read = cht_wc_byte_reg_read,
};
static const struct regmap_irq cht_wc_regmap_irqs[] = {
REGMAP_IRQ_REG(CHT_WC_PWRSRC_IRQ, 0, BIT(CHT_WC_PWRSRC_IRQ)),
REGMAP_IRQ_REG(CHT_WC_THRM_IRQ, 0, BIT(CHT_WC_THRM_IRQ)),
REGMAP_IRQ_REG(CHT_WC_BCU_IRQ, 0, BIT(CHT_WC_BCU_IRQ)),
REGMAP_IRQ_REG(CHT_WC_ADC_IRQ, 0, BIT(CHT_WC_ADC_IRQ)),
REGMAP_IRQ_REG(CHT_WC_EXT_CHGR_IRQ, 0, BIT(CHT_WC_EXT_CHGR_IRQ)),
REGMAP_IRQ_REG(CHT_WC_GPIO_IRQ, 0, BIT(CHT_WC_GPIO_IRQ)),
REGMAP_IRQ_REG(CHT_WC_CRIT_IRQ, 0, BIT(CHT_WC_CRIT_IRQ)),
};
static const struct regmap_irq_chip cht_wc_regmap_irq_chip = {
.name = "cht_wc_irq_chip",
.status_base = CHT_WC_IRQLVL1,
.mask_base = CHT_WC_IRQLVL1_MASK,
.irqs = cht_wc_regmap_irqs,
.num_irqs = ARRAY_SIZE(cht_wc_regmap_irqs),
.num_regs = 1,
};
static int cht_wc_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct intel_soc_pmic *pmic;
acpi_status status;
unsigned long long hrv;
int ret;
status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
if (ACPI_FAILURE(status)) {
dev_err(dev, "Failed to get PMIC hardware revision\n");
return -ENODEV;
}
if (hrv != CHT_WC_HRV) {
dev_err(dev, "Invalid PMIC hardware revision: %llu\n", hrv);
return -ENODEV;
}
if (client->irq < 0) {
dev_err(dev, "Invalid IRQ\n");
return -EINVAL;
}
pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
if (!pmic)
return -ENOMEM;
pmic->irq = client->irq;
pmic->dev = dev;
i2c_set_clientdata(client, pmic);
pmic->regmap = devm_regmap_init(dev, NULL, client, &cht_wc_regmap_cfg);
if (IS_ERR(pmic->regmap))
return PTR_ERR(pmic->regmap);
ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
IRQF_ONESHOT | IRQF_SHARED, 0,
&cht_wc_regmap_irq_chip,
&pmic->irq_chip_data);
if (ret)
return ret;
return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
cht_wc_dev, ARRAY_SIZE(cht_wc_dev), NULL, 0,
regmap_irq_get_domain(pmic->irq_chip_data));
}
static void cht_wc_shutdown(struct i2c_client *client)
{
struct intel_soc_pmic *pmic = i2c_get_clientdata(client);
disable_irq(pmic->irq);
}
static int __maybe_unused cht_wc_suspend(struct device *dev)
{
struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
disable_irq(pmic->irq);
return 0;
}
static int __maybe_unused cht_wc_resume(struct device *dev)
{
struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
enable_irq(pmic->irq);
return 0;
}
static SIMPLE_DEV_PM_OPS(cht_wc_pm_ops, cht_wc_suspend, cht_wc_resume);
static const struct i2c_device_id cht_wc_i2c_id[] = {
{ }
};
static const struct acpi_device_id cht_wc_acpi_ids[] = {
{ "INT34D3", },
{ }
};
static struct i2c_driver cht_wc_driver = {
.driver = {
.name = "CHT Whiskey Cove PMIC",
.pm = &cht_wc_pm_ops,
.acpi_match_table = cht_wc_acpi_ids,
},
.probe_new = cht_wc_probe,
.shutdown = cht_wc_shutdown,
.id_table = cht_wc_i2c_id,
};
builtin_i2c_driver(cht_wc_driver);
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