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

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

drivers/mfd/Kconfig

+16 −0
Original line number Diff line number Diff line
@@ -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

drivers/mfd/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/mfd/intel_soc_pmic_chtwc.c

0 → 100644
+230 −0
Original line number Diff line number Diff line 
/*

 * 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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