+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
- * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
- */
-
-#include <linux/err.h>
-#include <linux/gpio/driver.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of_irq.h>
-#include <linux/platform_device.h>
-#include <linux/spinlock.h>
-
-#define MTK_BANK_CNT 3
-#define MTK_BANK_WIDTH 32
-
-#define GPIO_BANK_WIDE 0x04
-#define GPIO_REG_CTRL 0x00
-#define GPIO_REG_POL 0x10
-#define GPIO_REG_DATA 0x20
-#define GPIO_REG_DSET 0x30
-#define GPIO_REG_DCLR 0x40
-#define GPIO_REG_REDGE 0x50
-#define GPIO_REG_FEDGE 0x60
-#define GPIO_REG_HLVL 0x70
-#define GPIO_REG_LLVL 0x80
-#define GPIO_REG_STAT 0x90
-#define GPIO_REG_EDGE 0xA0
-
-struct mtk_gc {
- struct gpio_chip chip;
- spinlock_t lock;
- int bank;
- u32 rising;
- u32 falling;
- u32 hlevel;
- u32 llevel;
-};
-
-/**
- * struct mtk_data - state container for
- * data of the platform driver. It is 3
- * separate gpio-chip each one with its
- * own irq_chip.
- * @dev: device instance
- * @gpio_membase: memory base address
- * @gpio_irq: irq number from the device tree
- * @gc_map: array of the gpio chips
- */
-struct mtk_data {
- struct device *dev;
- void __iomem *gpio_membase;
- int gpio_irq;
- struct mtk_gc gc_map[MTK_BANK_CNT];
-};
-
-static inline struct mtk_gc *
-to_mediatek_gpio(struct gpio_chip *chip)
-{
- return container_of(chip, struct mtk_gc, chip);
-}
-
-static inline void
-mtk_gpio_w32(struct mtk_gc *rg, u32 offset, u32 val)
-{
- struct gpio_chip *gc = &rg->chip;
- struct mtk_data *gpio_data = gpiochip_get_data(gc);
-
- offset = (rg->bank * GPIO_BANK_WIDE) + offset;
- gc->write_reg(gpio_data->gpio_membase + offset, val);
-}
-
-static inline u32
-mtk_gpio_r32(struct mtk_gc *rg, u32 offset)
-{
- struct gpio_chip *gc = &rg->chip;
- struct mtk_data *gpio_data = gpiochip_get_data(gc);
-
- offset = (rg->bank * GPIO_BANK_WIDE) + offset;
- return gc->read_reg(gpio_data->gpio_membase + offset);
-}
-
-static irqreturn_t
-mediatek_gpio_irq_handler(int irq, void *data)
-{
- struct gpio_chip *gc = data;
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- irqreturn_t ret = IRQ_NONE;
- unsigned long pending;
- int bit;
-
- pending = mtk_gpio_r32(rg, GPIO_REG_STAT);
-
- for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
- u32 map = irq_find_mapping(gc->irq.domain, bit);
-
- generic_handle_irq(map);
- mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
- ret |= IRQ_HANDLED;
- }
-
- return ret;
-}
-
-static void
-mediatek_gpio_irq_unmask(struct irq_data *d)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- int pin = d->hwirq;
- unsigned long flags;
- u32 rise, fall, high, low;
-
- spin_lock_irqsave(&rg->lock, flags);
- rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
- fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
- high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
- low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
- mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (BIT(pin) & rg->rising));
- mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (BIT(pin) & rg->falling));
- mtk_gpio_w32(rg, GPIO_REG_HLVL, high | (BIT(pin) & rg->hlevel));
- mtk_gpio_w32(rg, GPIO_REG_LLVL, low | (BIT(pin) & rg->llevel));
- spin_unlock_irqrestore(&rg->lock, flags);
-}
-
-static void
-mediatek_gpio_irq_mask(struct irq_data *d)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- int pin = d->hwirq;
- unsigned long flags;
- u32 rise, fall, high, low;
-
- spin_lock_irqsave(&rg->lock, flags);
- rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
- fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
- high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
- low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
- mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(pin));
- mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(pin));
- mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~BIT(pin));
- mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~BIT(pin));
- spin_unlock_irqrestore(&rg->lock, flags);
-}
-
-static int
-mediatek_gpio_irq_type(struct irq_data *d, unsigned int type)
-{
- struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
- struct mtk_gc *rg = to_mediatek_gpio(gc);
- int pin = d->hwirq;
- u32 mask = BIT(pin);
-
- if (type == IRQ_TYPE_PROBE) {
- if ((rg->rising | rg->falling |
- rg->hlevel | rg->llevel) & mask)
- return 0;
-
- type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
- }
-
- rg->rising &= ~mask;
- rg->falling &= ~mask;
- rg->hlevel &= ~mask;
- rg->llevel &= ~mask;
-
- switch (type & IRQ_TYPE_SENSE_MASK) {
- case IRQ_TYPE_EDGE_BOTH:
- rg->rising |= mask;
- rg->falling |= mask;
- break;
- case IRQ_TYPE_EDGE_RISING:
- rg->rising |= mask;
- break;
- case IRQ_TYPE_EDGE_FALLING:
- rg->falling |= mask;
- break;
- case IRQ_TYPE_LEVEL_HIGH:
- rg->hlevel |= mask;
- break;
- case IRQ_TYPE_LEVEL_LOW:
- rg->llevel |= mask;
- break;
- }
-
- return 0;
-}
-
-static struct irq_chip mediatek_gpio_irq_chip = {
- .irq_unmask = mediatek_gpio_irq_unmask,
- .irq_mask = mediatek_gpio_irq_mask,
- .irq_mask_ack = mediatek_gpio_irq_mask,
- .irq_set_type = mediatek_gpio_irq_type,
-};
-
-static int
-mediatek_gpio_xlate(struct gpio_chip *chip,
- const struct of_phandle_args *spec, u32 *flags)
-{
- int gpio = spec->args[0];
- struct mtk_gc *rg = to_mediatek_gpio(chip);
-
- if (rg->bank != gpio / MTK_BANK_WIDTH)
- return -EINVAL;
-
- if (flags)
- *flags = spec->args[1];
-
- return gpio % MTK_BANK_WIDTH;
-}
-
-static int
-mediatek_gpio_bank_probe(struct platform_device *pdev,
- struct device_node *node, int bank)
-{
- struct mtk_data *gpio = dev_get_drvdata(&pdev->dev);
- struct mtk_gc *rg;
- void __iomem *dat, *set, *ctrl, *diro;
- int ret;
-
- rg = &gpio->gc_map[bank];
- memset(rg, 0, sizeof(*rg));
-
- spin_lock_init(&rg->lock);
- rg->chip.of_node = node;
- rg->bank = bank;
-
- dat = gpio->gpio_membase + GPIO_REG_DATA + (rg->bank * GPIO_BANK_WIDE);
- set = gpio->gpio_membase + GPIO_REG_DSET + (rg->bank * GPIO_BANK_WIDE);
- ctrl = gpio->gpio_membase + GPIO_REG_DCLR + (rg->bank * GPIO_BANK_WIDE);
- diro = gpio->gpio_membase + GPIO_REG_CTRL + (rg->bank * GPIO_BANK_WIDE);
-
- ret = bgpio_init(&rg->chip, &pdev->dev, 4,
- dat, set, ctrl, diro, NULL, 0);
- if (ret) {
- dev_err(&pdev->dev, "bgpio_init() failed\n");
- return ret;
- }
-
- rg->chip.of_gpio_n_cells = 2;
- rg->chip.of_xlate = mediatek_gpio_xlate;
- rg->chip.label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-bank%d",
- dev_name(&pdev->dev), bank);
-
- ret = devm_gpiochip_add_data(&pdev->dev, &rg->chip, gpio);
- if (ret < 0) {
- dev_err(&pdev->dev, "Could not register gpio %d, ret=%d\n",
- rg->chip.ngpio, ret);
- return ret;
- }
-
- if (gpio->gpio_irq) {
- /*
- * Manually request the irq here instead of passing
- * a flow-handler to gpiochip_set_chained_irqchip,
- * because the irq is shared.
- */
- ret = devm_request_irq(&pdev->dev, gpio->gpio_irq,
- mediatek_gpio_irq_handler, IRQF_SHARED,
- rg->chip.label, &rg->chip);
-
- if (ret) {
- dev_err(&pdev->dev, "Error requesting IRQ %d: %d\n",
- gpio->gpio_irq, ret);
- return ret;
- }
-
- ret = gpiochip_irqchip_add(&rg->chip, &mediatek_gpio_irq_chip,
- 0, handle_simple_irq, IRQ_TYPE_NONE);
- if (ret) {
- dev_err(&pdev->dev, "failed to add gpiochip_irqchip\n");
- return ret;
- }
-
- gpiochip_set_chained_irqchip(&rg->chip, &mediatek_gpio_irq_chip,
- gpio->gpio_irq, NULL);
- }
-
- /* set polarity to low for all gpios */
- mtk_gpio_w32(rg, GPIO_REG_POL, 0);
-
- dev_info(&pdev->dev, "registering %d gpios\n", rg->chip.ngpio);
-
- return 0;
-}
-
-static int
-mediatek_gpio_probe(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- struct mtk_data *gpio_data;
- int i;
-
- gpio_data = devm_kzalloc(&pdev->dev, sizeof(*gpio_data), GFP_KERNEL);
- if (!gpio_data)
- return -ENOMEM;
-
- gpio_data->gpio_membase = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(gpio_data->gpio_membase))
- return PTR_ERR(gpio_data->gpio_membase);
-
- gpio_data->gpio_irq = irq_of_parse_and_map(np, 0);
- gpio_data->dev = &pdev->dev;
- platform_set_drvdata(pdev, gpio_data);
- mediatek_gpio_irq_chip.name = dev_name(&pdev->dev);
-
- for (i = 0; i < MTK_BANK_CNT; i++)
- mediatek_gpio_bank_probe(pdev, np, i);
-
- return 0;
-}
-
-static const struct of_device_id mediatek_gpio_match[] = {
- { .compatible = "mediatek,mt7621-gpio" },
- {},
-};
-MODULE_DEVICE_TABLE(of, mediatek_gpio_match);
-
-static struct platform_driver mediatek_gpio_driver = {
- .probe = mediatek_gpio_probe,
- .driver = {
- .name = "mt7621_gpio",
- .of_match_table = mediatek_gpio_match,
- },
-};
-
-builtin_platform_driver(mediatek_gpio_driver);
projects / platform / kernel / linux-rpi.git / commitdiff