+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Intel Medfield MSIC GPIO driver>
- * Copyright (c) 2011, Intel Corporation.
- *
- * Author: Mathias Nyman <mathias.nyman@linux.intel.com>
- * Based on intel_pmic_gpio.c
- */
-
-#include <linux/gpio/driver.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/mfd/intel_msic.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-
-/* the offset for the mapping of global gpio pin to irq */
-#define MSIC_GPIO_IRQ_OFFSET 0x100
-
-#define MSIC_GPIO_DIR_IN 0
-#define MSIC_GPIO_DIR_OUT BIT(5)
-#define MSIC_GPIO_TRIG_FALL BIT(1)
-#define MSIC_GPIO_TRIG_RISE BIT(2)
-
-/* masks for msic gpio output GPIOxxxxCTLO registers */
-#define MSIC_GPIO_DIR_MASK BIT(5)
-#define MSIC_GPIO_DRV_MASK BIT(4)
-#define MSIC_GPIO_REN_MASK BIT(3)
-#define MSIC_GPIO_RVAL_MASK (BIT(2) | BIT(1))
-#define MSIC_GPIO_DOUT_MASK BIT(0)
-
-/* masks for msic gpio input GPIOxxxxCTLI registers */
-#define MSIC_GPIO_GLBYP_MASK BIT(5)
-#define MSIC_GPIO_DBNC_MASK (BIT(4) | BIT(3))
-#define MSIC_GPIO_INTCNT_MASK (BIT(2) | BIT(1))
-#define MSIC_GPIO_DIN_MASK BIT(0)
-
-#define MSIC_NUM_GPIO 24
-
-struct msic_gpio {
- struct platform_device *pdev;
- struct mutex buslock;
- struct gpio_chip chip;
- int irq;
- unsigned irq_base;
- unsigned long trig_change_mask;
- unsigned trig_type;
-};
-
-/*
- * MSIC has 24 gpios, 16 low voltage (1.2-1.8v) and 8 high voltage (3v).
- * Both the high and low voltage gpios are divided in two banks.
- * GPIOs are numbered with GPIO0LV0 as gpio_base in the following order:
- * GPIO0LV0..GPIO0LV7: low voltage, bank 0, gpio_base
- * GPIO1LV0..GPIO1LV7: low voltage, bank 1, gpio_base + 8
- * GPIO0HV0..GPIO0HV3: high voltage, bank 0, gpio_base + 16
- * GPIO1HV0..GPIO1HV3: high voltage, bank 1, gpio_base + 20
- */
-
-static int msic_gpio_to_ireg(unsigned offset)
-{
- if (offset >= MSIC_NUM_GPIO)
- return -EINVAL;
-
- if (offset < 8)
- return INTEL_MSIC_GPIO0LV0CTLI - offset;
- if (offset < 16)
- return INTEL_MSIC_GPIO1LV0CTLI - offset + 8;
- if (offset < 20)
- return INTEL_MSIC_GPIO0HV0CTLI - offset + 16;
-
- return INTEL_MSIC_GPIO1HV0CTLI - offset + 20;
-}
-
-static int msic_gpio_to_oreg(unsigned offset)
-{
- if (offset >= MSIC_NUM_GPIO)
- return -EINVAL;
-
- if (offset < 8)
- return INTEL_MSIC_GPIO0LV0CTLO - offset;
- if (offset < 16)
- return INTEL_MSIC_GPIO1LV0CTLO - offset + 8;
- if (offset < 20)
- return INTEL_MSIC_GPIO0HV0CTLO - offset + 16;
-
- return INTEL_MSIC_GPIO1HV0CTLO - offset + 20;
-}
-
-static int msic_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
-{
- int reg;
-
- reg = msic_gpio_to_oreg(offset);
- if (reg < 0)
- return reg;
-
- return intel_msic_reg_update(reg, MSIC_GPIO_DIR_IN, MSIC_GPIO_DIR_MASK);
-}
-
-static int msic_gpio_direction_output(struct gpio_chip *chip,
- unsigned offset, int value)
-{
- int reg;
- unsigned mask;
-
- value = (!!value) | MSIC_GPIO_DIR_OUT;
- mask = MSIC_GPIO_DIR_MASK | MSIC_GPIO_DOUT_MASK;
-
- reg = msic_gpio_to_oreg(offset);
- if (reg < 0)
- return reg;
-
- return intel_msic_reg_update(reg, value, mask);
-}
-
-static int msic_gpio_get(struct gpio_chip *chip, unsigned offset)
-{
- u8 r;
- int ret;
- int reg;
-
- reg = msic_gpio_to_ireg(offset);
- if (reg < 0)
- return reg;
-
- ret = intel_msic_reg_read(reg, &r);
- if (ret < 0)
- return ret;
-
- return !!(r & MSIC_GPIO_DIN_MASK);
-}
-
-static void msic_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
- int reg;
-
- reg = msic_gpio_to_oreg(offset);
- if (reg < 0)
- return;
-
- intel_msic_reg_update(reg, !!value , MSIC_GPIO_DOUT_MASK);
-}
-
-/*
- * This is called from genirq with mg->buslock locked and
- * irq_desc->lock held. We can not access the scu bus here, so we
- * store the change and update in the bus_sync_unlock() function below
- */
-static int msic_irq_type(struct irq_data *data, unsigned type)
-{
- struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
- u32 gpio = data->irq - mg->irq_base;
-
- if (gpio >= mg->chip.ngpio)
- return -EINVAL;
-
- /* mark for which gpio the trigger changed, protected by buslock */
- mg->trig_change_mask |= (1 << gpio);
- mg->trig_type = type;
-
- return 0;
-}
-
-static int msic_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct msic_gpio *mg = gpiochip_get_data(chip);
- return mg->irq_base + offset;
-}
-
-static void msic_bus_lock(struct irq_data *data)
-{
- struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
- mutex_lock(&mg->buslock);
-}
-
-static void msic_bus_sync_unlock(struct irq_data *data)
-{
- struct msic_gpio *mg = irq_data_get_irq_chip_data(data);
- int offset;
- int reg;
- u8 trig = 0;
-
- /* We can only get one change at a time as the buslock covers the
- entire transaction. The irq_desc->lock is dropped before we are
- called but that is fine */
- if (mg->trig_change_mask) {
- offset = __ffs(mg->trig_change_mask);
-
- reg = msic_gpio_to_ireg(offset);
- if (reg < 0)
- goto out;
-
- if (mg->trig_type & IRQ_TYPE_EDGE_RISING)
- trig |= MSIC_GPIO_TRIG_RISE;
- if (mg->trig_type & IRQ_TYPE_EDGE_FALLING)
- trig |= MSIC_GPIO_TRIG_FALL;
-
- intel_msic_reg_update(reg, trig, MSIC_GPIO_INTCNT_MASK);
- mg->trig_change_mask = 0;
- }
-out:
- mutex_unlock(&mg->buslock);
-}
-
-/* Firmware does all the masking and unmasking for us, no masking here. */
-static void msic_irq_unmask(struct irq_data *data) { }
-
-static void msic_irq_mask(struct irq_data *data) { }
-
-static struct irq_chip msic_irqchip = {
- .name = "MSIC-GPIO",
- .irq_mask = msic_irq_mask,
- .irq_unmask = msic_irq_unmask,
- .irq_set_type = msic_irq_type,
- .irq_bus_lock = msic_bus_lock,
- .irq_bus_sync_unlock = msic_bus_sync_unlock,
-};
-
-static void msic_gpio_irq_handler(struct irq_desc *desc)
-{
- struct irq_data *data = irq_desc_get_irq_data(desc);
- struct msic_gpio *mg = irq_data_get_irq_handler_data(data);
- struct irq_chip *chip = irq_data_get_irq_chip(data);
- struct intel_msic *msic = pdev_to_intel_msic(mg->pdev);
- unsigned long pending;
- int i;
- int bitnr;
- u8 pin;
-
- for (i = 0; i < (mg->chip.ngpio / BITS_PER_BYTE); i++) {
- intel_msic_irq_read(msic, INTEL_MSIC_GPIO0LVIRQ + i, &pin);
- pending = pin;
-
- for_each_set_bit(bitnr, &pending, BITS_PER_BYTE)
- generic_handle_irq(mg->irq_base + i * BITS_PER_BYTE + bitnr);
- }
- chip->irq_eoi(data);
-}
-
-static int platform_msic_gpio_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct intel_msic_gpio_pdata *pdata = dev_get_platdata(dev);
- struct msic_gpio *mg;
- int irq = platform_get_irq(pdev, 0);
- int retval;
- int i;
-
- if (irq < 0) {
- dev_err(dev, "no IRQ line: %d\n", irq);
- return irq;
- }
-
- if (!pdata || !pdata->gpio_base) {
- dev_err(dev, "incorrect or missing platform data\n");
- return -EINVAL;
- }
-
- mg = kzalloc(sizeof(*mg), GFP_KERNEL);
- if (!mg)
- return -ENOMEM;
-
- dev_set_drvdata(dev, mg);
-
- mg->pdev = pdev;
- mg->irq = irq;
- mg->irq_base = pdata->gpio_base + MSIC_GPIO_IRQ_OFFSET;
- mg->chip.label = "msic_gpio";
- mg->chip.direction_input = msic_gpio_direction_input;
- mg->chip.direction_output = msic_gpio_direction_output;
- mg->chip.get = msic_gpio_get;
- mg->chip.set = msic_gpio_set;
- mg->chip.to_irq = msic_gpio_to_irq;
- mg->chip.base = pdata->gpio_base;
- mg->chip.ngpio = MSIC_NUM_GPIO;
- mg->chip.can_sleep = true;
- mg->chip.parent = dev;
-
- mutex_init(&mg->buslock);
-
- retval = gpiochip_add_data(&mg->chip, mg);
- if (retval) {
- dev_err(dev, "Adding MSIC gpio chip failed\n");
- goto err;
- }
-
- for (i = 0; i < mg->chip.ngpio; i++) {
- irq_set_chip_data(i + mg->irq_base, mg);
- irq_set_chip_and_handler(i + mg->irq_base,
- &msic_irqchip,
- handle_simple_irq);
- }
- irq_set_chained_handler_and_data(mg->irq, msic_gpio_irq_handler, mg);
-
- return 0;
-err:
- kfree(mg);
- return retval;
-}
-
-static struct platform_driver platform_msic_gpio_driver = {
- .driver = {
- .name = "msic_gpio",
- },
- .probe = platform_msic_gpio_probe,
-};
-
-static int __init platform_msic_gpio_init(void)
-{
- return platform_driver_register(&platform_msic_gpio_driver);
-}
-subsys_initcall(platform_msic_gpio_init);
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