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Date: Fri, 1 Jul 2016 23:21:20 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Bin Gao <bin.gao@...ux.intel.com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>,
Mathias Nyman <mathias.nyman@...ux.intel.com>,
Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Ajay Thomas <ajay.thomas.david.rajamanickam@...el.com>,
Yegnesh S Iyer <yegnesh.s.iyer@...el.com>,
Bin Gao <bin.gao@...el.com>
Subject: Re: [PATCH v4] gpio: add Intel WhiskeyCove GPIO driver
On Tue, Jun 28, 2016 at 2:56 AM, Bin Gao <bin.gao@...ux.intel.com> wrote:
> This patch introduces a separate GPIO driver for Intel WhiskeyCove PMIC.
> This driver is based on gpio-crystalcove.c.
There are still minors, though they would be fixed later.
FWIW:
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
>
> Signed-off-by: Ajay Thomas <ajay.thomas.david.rajamanickam@...el.com>
> Signed-off-by: Bin Gao <bin.gao@...el.com>
> ---
> Changes in v4:
> - Converted CTLI_INTCNT_XX macros to less verbose ones INT_DETECT_XX.
> - Add comments about why there is no .pm for the driver.
> - Header files re-ordered.
> - Various coding style change to address Andy's comments.
> Changes in v3:
> - Fixed the year in copyright line(2015-->2016).
> - Removed DRV_NAME macro.
> - Added kernel-doc for regmap_irq_chip of the wcove_gpio structure.
> - Line length fix.
> Changes in v2:
> - Typo fix (Whsikey --> Whiskey).
> - Included linux/gpio/driver.h instead of linux/gpio.h
> - Implemented .set_single_ended().
> - Added GPIO register description.
> - Replaced container_of() with gpiochip_get_data().
> - Removed unnecessary "if (gpio > WCOVE_VGPIO_NUM" check.
> - Removed the device id table and added MODULE_ALIAS().
> drivers/gpio/Kconfig | 13 ++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-wcove.c | 433 ++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 447 insertions(+)
> create mode 100644 drivers/gpio/gpio-wcove.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index cebcb40..ac74299 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -806,6 +806,19 @@ config GPIO_CRYSTAL_COVE
> This driver can also be built as a module. If so, the module will be
> called gpio-crystalcove.
>
> +config GPIO_WHISKEY_COVE
> + tristate "GPIO support for Whiskey Cove PMIC"
> + depends on INTEL_SOC_PMIC
> + select GPIOLIB_IRQCHIP
> + help
> + Support for GPIO pins on Whiskey Cove PMIC.
> +
> + Say Yes if you have a Intel SoC based tablet with Whiskey Cove PMIC
> + inside.
> +
> + This driver can also be built as a module. If so, the module will be
> + called gpio-wcove.
> +
> config GPIO_CS5535
> tristate "AMD CS5535/CS5536 GPIO support"
> depends on MFD_CS5535
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 991598e..fff6914 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -34,6 +34,7 @@ obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
> obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
> obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o
> obj-$(CONFIG_GPIO_CRYSTAL_COVE) += gpio-crystalcove.o
> +obj-$(CONFIG_GPIO_WHISKEY_COVE) += gpio-wcove.o
> obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o
> obj-$(CONFIG_GPIO_DA9055) += gpio-da9055.o
> obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o
> diff --git a/drivers/gpio/gpio-wcove.c b/drivers/gpio/gpio-wcove.c
> new file mode 100644
> index 0000000..9f1b25a
> --- /dev/null
> +++ b/drivers/gpio/gpio-wcove.c
> @@ -0,0 +1,433 @@
> +/*
> + * gpio-wcove.c - Intel Whiskey Cove GPIO Driver
> + *
> + * This driver is written based on gpio-crystalcove.c
> + *
> + * Copyright (C) 2016 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.
> + *
> + * 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/bitops.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/intel_soc_pmic.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/seq_file.h>
> +
> +/*
> + * Whiskey Cove PMIC has 13 physical GPIO pins divided into 3 banks:
> + * Bank 0: Pin 0 - 6
> + * Bank 1: Pin 7 - 10
> + * Bank 2: Pin 11 -12
> + * Each pin has one output control register and one input control register.
> + */
> +#define BANK0_NR_PINS 7
> +#define BANK1_NR_PINS 4
> +#define BANK2_NR_PINS 2
> +#define WCOVE_GPIO_NUM (BANK0_NR_PINS + BANK1_NR_PINS + BANK2_NR_PINS)
> +#define WCOVE_VGPIO_NUM 94
> +/* GPIO output control registers(one per pin): 0x4e44 - 0x4e50 */
> +#define OUT_CTRL_OFFSET 0x4e44
> +/* GPIO input control registers(one per pin): 0x4e51 - 0x4e5d */
> +#define IN_CTRL_OFFSET 0x4e51
> +
> +/*
> + * GPIO interrupts are organized in two groups:
> + * Group 0: Bank 0 pins (Pin 0 - 6)
> + * Group 1: Bank 1 and Bank 2 pins (Pin 7 - 12)
> + * Each group has two registers(one bit per pin): status and mask.
> + */
> +#define GROUP0_NR_IRQS 7
> +#define GROUP1_NR_IRQS 6
> +#define IRQ_MASK_OFFSET 0x4e19
> +#define IRQ_STATUS_OFFSET 0x4e0b
> +#define UPDATE_IRQ_TYPE BIT(0)
> +#define UPDATE_IRQ_MASK BIT(1)
> +
> +#define LSHIFT_ONE(x) ((x) << 1)
> +
> +/* GPIO Input Pin Interrupt Dectection */
> +#define INT_DETECT_DISABLE LSHIFT_ONE(0) /* Disable interrupt input */
> +#define INT_DETECT_FALLING LSHIFT_ONE(1) /* Detect falling edge */
> +#define INT_DETECT_RISING LSHIFT_ONE(2) /* Detect rising edge */
> +#define INT_DETECT_BOTH LSHIFT_ONE(3) /* Detect both edges */
> +
> +#define CTLO_DIR_IN (0)
> +#define CTLO_DIR_OUT (1 << 5)
> +
> +#define CTLO_DRV_MASK (1 << 4)
> +#define CTLO_DRV_OD (0)
> +#define CTLO_DRV_CMOS CTLO_DRV_MASK
> +
> +#define CTLO_DRV_REN (1 << 3)
> +
> +#define CTLO_RVAL_2KDW LSHIFT_ONE(0)
> +#define CTLO_RVAL_2KUP LSHIFT_ONE(1)
> +#define CTLO_RVAL_50KDW LSHIFT_ONE(2)
> +#define CTLO_RVAL_50KUP LSHIFT_ONE(3)
> +
> +#define CTLO_INPUT_SET (CTLO_DRV_CMOS | CTLO_DRV_REN | CTLO_RVAL_2KUP)
> +#define CTLO_OUTPUT_SET (CTLO_DIR_OUT | CTLO_INPUT_SET)
> +
> +enum ctrl_register {
> + CTRL_IN,
> + CTRL_OUT,
> +};
> +
> +/*
> + * struct wcove_gpio - Whiskey Cove GPIO controller
> + * @buslock: for bus lock/sync and unlock.
> + * @chip: the abstract gpio_chip structure.
> + * @regmap: the regmap from the parent device.
> + * @regmap_irq_chip: the regmap of the gpio irq chip.
> + * @update: pending IRQ setting update, to be written to the chip upon unlock.
> + * @intcnt_value: the Interrupt Detect value to be written.
> + * @set_irq_mask: true if the IRQ mask needs to be set, false to clear.
> + */
> +struct wcove_gpio {
> + struct mutex buslock; /* irq_bus_lock */
> + struct gpio_chip chip;
> + struct regmap *regmap;
> + struct regmap_irq_chip_data *regmap_irq_chip;
> + int update;
> + int intcnt_value;
> + bool set_irq_mask;
> +};
> +
> +static inline unsigned int to_reg(int gpio, enum ctrl_register reg_type)
> +{
> + unsigned int reg;
> + int bank;
> +
> + if (gpio < BANK0_NR_PINS)
> + bank = 0;
> + else if (gpio < (BANK0_NR_PINS + BANK1_NR_PINS))
> + bank = 1;
> + else
> + bank = 2;
> +
> + if (reg_type == CTRL_IN)
> + reg = IN_CTRL_OFFSET + bank;
> + else
> + reg = OUT_CTRL_OFFSET + bank;
> +
> + return reg;
> +}
> +
> +static void wcove_update_irq_mask(struct wcove_gpio *wg, int gpio)
> +{
> + int group;
> + unsigned int reg, bit;
> +
> + group = gpio < GROUP0_NR_IRQS ? 0 : 1;
> + reg = IRQ_MASK_OFFSET + group;
> + bit = (group == 0) ? BIT(gpio % GROUP0_NR_IRQS) :
> + BIT((gpio - GROUP0_NR_IRQS) % GROUP1_NR_IRQS);
> +
> + if (wg->set_irq_mask)
> + regmap_update_bits(wg->regmap, reg, bit, 1);
> + else
> + regmap_update_bits(wg->regmap, reg, bit, 0);
> +}
> +
> +static void wcove_update_irq_ctrl(struct wcove_gpio *wg, int gpio)
> +{
> + unsigned int reg = to_reg(gpio, CTRL_IN);
> +
> + regmap_update_bits(wg->regmap, reg, INT_DETECT_BOTH, wg->intcnt_value);
> +}
> +
> +static int wcove_gpio_dir_in(struct gpio_chip *chip, unsigned int gpio)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(chip);
> +
> + return regmap_write(wg->regmap, to_reg(gpio, CTRL_OUT),
> + CTLO_INPUT_SET);
> +}
> +
> +static int wcove_gpio_dir_out(struct gpio_chip *chip, unsigned int gpio,
> + int value)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(chip);
> +
> + return regmap_write(wg->regmap, to_reg(gpio, CTRL_OUT),
> + CTLO_OUTPUT_SET | value);
> +}
> +
> +static int wcove_gpio_get(struct gpio_chip *chip, unsigned int gpio)
> +{
> + int ret;
> + unsigned int val;
> + struct wcove_gpio *wg = gpiochip_get_data(chip);
> +
> + ret = regmap_read(wg->regmap, to_reg(gpio, CTRL_IN), &val);
> + if (ret)
> + return ret;
> +
> + return val & 0x1;
> +}
> +
> +static void wcove_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(chip);
> +
> + if (value)
> + regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT), 1, 1);
> + else
> + regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT), 1, 0);
> +}
> +
> +static int wcove_gpio_set_single_ended(struct gpio_chip *chip,
> + unsigned int gpio,
> + enum single_ended_mode mode)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(chip);
> +
> + switch (mode) {
> + case LINE_MODE_OPEN_DRAIN:
> + return regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT),
> + CTLO_DRV_MASK, CTLO_DRV_OD);
> + case LINE_MODE_PUSH_PULL:
> + return regmap_update_bits(wg->regmap, to_reg(gpio, CTRL_OUT),
> + CTLO_DRV_MASK, CTLO_DRV_CMOS);
> + default:
> + break;
> + }
> +
> + return -ENOTSUPP;
> +}
> +
> +static int wcove_irq_type(struct irq_data *data, unsigned int type)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(
> + irq_data_get_irq_chip_data(data));
> +
> + switch (type) {
> + case IRQ_TYPE_NONE:
> + wg->intcnt_value = INT_DETECT_DISABLE;
> + break;
> + case IRQ_TYPE_EDGE_BOTH:
> + wg->intcnt_value = INT_DETECT_BOTH;
> + break;
> + case IRQ_TYPE_EDGE_RISING:
> + wg->intcnt_value = INT_DETECT_RISING;
> + break;
> + case IRQ_TYPE_EDGE_FALLING:
> + wg->intcnt_value = INT_DETECT_FALLING;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + wg->update |= UPDATE_IRQ_TYPE;
> +
> + return 0;
> +}
> +
> +static void wcove_bus_lock(struct irq_data *data)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(
> + irq_data_get_irq_chip_data(data));
> +
> + mutex_lock(&wg->buslock);
> +}
> +
> +static void wcove_bus_sync_unlock(struct irq_data *data)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(
> + irq_data_get_irq_chip_data(data));
> + int gpio = data->hwirq;
> +
> + if (wg->update & UPDATE_IRQ_TYPE)
> + wcove_update_irq_ctrl(wg, gpio);
> + if (wg->update & UPDATE_IRQ_MASK)
> + wcove_update_irq_mask(wg, gpio);
> +
> + wg->update = 0;
> +
> + mutex_unlock(&wg->buslock);
> +}
> +
> +static void wcove_irq_unmask(struct irq_data *data)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(
> + irq_data_get_irq_chip_data(data));
> +
> + wg->set_irq_mask = false;
> + wg->update |= UPDATE_IRQ_MASK;
> +}
> +
> +static void wcove_irq_mask(struct irq_data *data)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(
> + irq_data_get_irq_chip_data(data));
> +
> + wg->set_irq_mask = true;
> + wg->update |= UPDATE_IRQ_MASK;
> +}
> +
> +static struct irq_chip wcove_irqchip = {
> + .name = "Whiskey Cove",
> + .irq_mask = wcove_irq_mask,
> + .irq_unmask = wcove_irq_unmask,
> + .irq_set_type = wcove_irq_type,
> + .irq_bus_lock = wcove_bus_lock,
> + .irq_bus_sync_unlock = wcove_bus_sync_unlock,
> +};
> +
> +static irqreturn_t wcove_gpio_irq_handler(int irq, void *data)
> +{
> + int pending;
> + unsigned int p0, p1, virq, gpio;
> + struct wcove_gpio *wg = data;
> +
> + if (regmap_read(wg->regmap, IRQ_STATUS_OFFSET + 0, &p0) ||
> + regmap_read(wg->regmap, IRQ_STATUS_OFFSET + 1, &p1)) {
> + dev_err(wg->chip.parent, "%s(): regmap_read() failed.\n",
> + __func__);
> + return IRQ_NONE;
> + }
> +
> + pending = p0 | (p1 << 8);
> +
> + for (gpio = 0; gpio < WCOVE_GPIO_NUM; gpio++) {
> + if (pending & BIT(gpio)) {
> + virq = irq_find_mapping(wg->chip.irqdomain, gpio);
> + handle_nested_irq(virq);
> + }
> + }
> +
> + regmap_write(wg->regmap, IRQ_STATUS_OFFSET + 0, p0);
> + regmap_write(wg->regmap, IRQ_STATUS_OFFSET + 1, p1);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void wcove_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
> +{
> + struct wcove_gpio *wg = gpiochip_get_data(chip);
> + int gpio, offset, group;
> + unsigned int ctlo, ctli, irq_mask, irq_status;
> +
> + for (gpio = 0; gpio < WCOVE_GPIO_NUM; gpio++) {
> + group = gpio < GROUP0_NR_IRQS ? 0 : 1;
> + regmap_read(wg->regmap, to_reg(gpio, CTRL_OUT), &ctlo);
> + regmap_read(wg->regmap, to_reg(gpio, CTRL_IN), &ctli);
> + regmap_read(wg->regmap, IRQ_MASK_OFFSET + group, &irq_mask);
> + regmap_read(wg->regmap, IRQ_STATUS_OFFSET + group, &irq_status);
> +
> + offset = gpio % 8;
> + seq_printf(s, " gpio-%-2d %s %s %s %s ctlo=%2x,%s %s\n",
> + gpio, ctlo & CTLO_DIR_OUT ? "out" : "in ",
> + ctli & 0x1 ? "hi" : "lo",
> + ctli & INT_DETECT_FALLING ? "falling" : " ",
> + ctli & INT_DETECT_RISING ? "rising" : " ",
> + ctlo,
> + irq_mask & BIT(offset) ? "mask " : "unmask",
> + irq_status & BIT(offset) ? "pending" : " ");
> + }
> +}
> +
> +static int wcove_gpio_probe(struct platform_device *pdev)
> +{
> + int virq, retval, irq;
> + struct wcove_gpio *wg;
> + struct device *dev = pdev->dev.parent;
> + struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + wg = devm_kzalloc(&pdev->dev, sizeof(*wg), GFP_KERNEL);
> + if (!wg)
> + return -ENOMEM;
> +
> + wg->regmap_irq_chip = pmic->irq_chip_data_level2;
> +
> + platform_set_drvdata(pdev, wg);
> +
> + mutex_init(&wg->buslock);
> + wg->chip.label = KBUILD_MODNAME;
> + wg->chip.direction_input = wcove_gpio_dir_in;
> + wg->chip.direction_output = wcove_gpio_dir_out;
> + wg->chip.get = wcove_gpio_get;
> + wg->chip.set = wcove_gpio_set;
> + wg->chip.set_single_ended = wcove_gpio_set_single_ended,
> + wg->chip.base = -1;
> + wg->chip.ngpio = WCOVE_VGPIO_NUM;
> + wg->chip.can_sleep = true;
> + wg->chip.parent = dev;
> + wg->chip.dbg_show = wcove_gpio_dbg_show;
> + wg->regmap = pmic->regmap;
> +
> + retval = devm_gpiochip_add_data(&pdev->dev, &wg->chip, wg);
> + if (retval) {
> + dev_err(&pdev->dev, "add gpio chip error: %d\n", retval);
> + return retval;
> + }
> +
> + gpiochip_irqchip_add(&wg->chip, &wcove_irqchip, 0,
> + handle_simple_irq, IRQ_TYPE_NONE);
> +
> + virq = regmap_irq_get_virq(wg->regmap_irq_chip, irq);
> + if (virq < 0) {
> + dev_err(&pdev->dev, "failed to get virq %d\n", irq);
> + retval = virq;
> + goto out_remove_gpio;
> + }
> +
> + retval = devm_request_threaded_irq(&pdev->dev, virq,
> + NULL, wcove_gpio_irq_handler,
> + IRQF_ONESHOT, pdev->name, wg);
> +
> + if (retval) {
> + dev_warn(&pdev->dev, "request irq failed: %d, virq: %d\n",
> + retval, virq);
> + goto out_remove_gpio;
> + }
> +
> + return 0;
> +
> +out_remove_gpio:
> + devm_gpiochip_remove(&pdev->dev, &wg->chip);
> + return retval;
> +}
> +
> +static int wcove_gpio_remove(struct platform_device *pdev)
> +{
> + struct wcove_gpio *wg = platform_get_drvdata(pdev);
> +
> + devm_gpiochip_remove(&pdev->dev, &wg->chip);
> + return 0;
> +}
> +
> +/*
> + * Whiskey Cove PMIC itself is a analog device(but with digital control
> + * interface) providing power management support for other devices in
> + * the accompanied SoC, so we have no .pm for Whiskey Cove GPIO driver.
> + */
> +static struct platform_driver wcove_gpio_driver = {
> + .driver = {
> + .name = "bxt_wcove_gpio",
> + },
> + .probe = wcove_gpio_probe,
> + .remove = wcove_gpio_remove,
> +};
> +
> +module_platform_driver(wcove_gpio_driver);
> +
> +MODULE_AUTHOR("Ajay Thomas <ajay.thomas.david.rajamanickam@...el.com>");
> +MODULE_AUTHOR("Bin Gao <bin.gao@...el.com>");
> +MODULE_DESCRIPTION("Intel Whiskey Cove GPIO Driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:bxt_wcove_gpio");
> --
> 1.9.1
>
--
With Best Regards,
Andy Shevchenko
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