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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 09:40:53 +07:00
27ca226711
As we want gpio_chip .get() calls to be able to return negative error codes and propagate to drivers, we need to go over all drivers and make sure their return values are clamped to [0,1]. We do this by using the ret = !!(val) design pattern. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
338 lines
8.4 KiB
C
338 lines
8.4 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* License Terms: GNU General Public License, version 2
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* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/of.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/tc3589x.h>
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/*
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* These registers are modified under the irq bus lock and cached to avoid
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* unnecessary writes in bus_sync_unlock.
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*/
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enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
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#define CACHE_NR_REGS 4
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#define CACHE_NR_BANKS 3
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struct tc3589x_gpio {
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struct gpio_chip chip;
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struct tc3589x *tc3589x;
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struct device *dev;
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struct mutex irq_lock;
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/* Caches of interrupt control registers for bus_lock */
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u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
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u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
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};
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static inline struct tc3589x_gpio *to_tc3589x_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct tc3589x_gpio, chip);
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}
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static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
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u8 mask = 1 << (offset % 8);
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int ret;
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ret = tc3589x_reg_read(tc3589x, reg);
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if (ret < 0)
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return ret;
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return !!(ret & mask);
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}
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static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
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{
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
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unsigned pos = offset % 8;
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u8 data[] = {!!val << pos, 1 << pos};
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tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
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}
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static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int val)
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{
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODIR0 + offset / 8;
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unsigned pos = offset % 8;
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tc3589x_gpio_set(chip, offset, val);
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return tc3589x_set_bits(tc3589x, reg, 1 << pos, 1 << pos);
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}
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static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
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unsigned offset)
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{
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 reg = TC3589x_GPIODIR0 + offset / 8;
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unsigned pos = offset % 8;
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return tc3589x_set_bits(tc3589x, reg, 1 << pos, 0);
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}
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static struct gpio_chip template_chip = {
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.label = "tc3589x",
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.owner = THIS_MODULE,
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.direction_input = tc3589x_gpio_direction_input,
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.get = tc3589x_gpio_get,
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.direction_output = tc3589x_gpio_direction_output,
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.set = tc3589x_gpio_set,
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.can_sleep = true,
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};
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static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(gc);
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int offset = d->hwirq;
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int regoffset = offset / 8;
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int mask = 1 << (offset % 8);
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if (type == IRQ_TYPE_EDGE_BOTH) {
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tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
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return 0;
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}
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tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
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if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
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tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
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else
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tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
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if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
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tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
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else
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tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
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return 0;
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}
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static void tc3589x_gpio_irq_lock(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(gc);
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mutex_lock(&tc3589x_gpio->irq_lock);
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}
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static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(gc);
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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static const u8 regmap[] = {
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[REG_IBE] = TC3589x_GPIOIBE0,
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[REG_IEV] = TC3589x_GPIOIEV0,
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[REG_IS] = TC3589x_GPIOIS0,
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[REG_IE] = TC3589x_GPIOIE0,
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};
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int i, j;
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for (i = 0; i < CACHE_NR_REGS; i++) {
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for (j = 0; j < CACHE_NR_BANKS; j++) {
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u8 old = tc3589x_gpio->oldregs[i][j];
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u8 new = tc3589x_gpio->regs[i][j];
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if (new == old)
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continue;
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tc3589x_gpio->oldregs[i][j] = new;
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tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
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}
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}
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mutex_unlock(&tc3589x_gpio->irq_lock);
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}
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static void tc3589x_gpio_irq_mask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(gc);
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int offset = d->hwirq;
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int regoffset = offset / 8;
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int mask = 1 << (offset % 8);
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tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
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}
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static void tc3589x_gpio_irq_unmask(struct irq_data *d)
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{
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struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
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struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(gc);
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int offset = d->hwirq;
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int regoffset = offset / 8;
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int mask = 1 << (offset % 8);
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tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
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}
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static struct irq_chip tc3589x_gpio_irq_chip = {
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.name = "tc3589x-gpio",
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.irq_bus_lock = tc3589x_gpio_irq_lock,
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.irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
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.irq_mask = tc3589x_gpio_irq_mask,
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.irq_unmask = tc3589x_gpio_irq_unmask,
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.irq_set_type = tc3589x_gpio_irq_set_type,
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};
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static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
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{
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struct tc3589x_gpio *tc3589x_gpio = dev;
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struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
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u8 status[CACHE_NR_BANKS];
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int ret;
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int i;
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ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
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ARRAY_SIZE(status), status);
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if (ret < 0)
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return IRQ_NONE;
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for (i = 0; i < ARRAY_SIZE(status); i++) {
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unsigned int stat = status[i];
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if (!stat)
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continue;
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while (stat) {
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int bit = __ffs(stat);
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int line = i * 8 + bit;
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int irq = irq_find_mapping(tc3589x_gpio->chip.irqdomain,
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line);
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handle_nested_irq(irq);
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stat &= ~(1 << bit);
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}
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tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
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}
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return IRQ_HANDLED;
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}
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static int tc3589x_gpio_probe(struct platform_device *pdev)
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{
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struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
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struct device_node *np = pdev->dev.of_node;
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struct tc3589x_gpio *tc3589x_gpio;
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int ret;
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int irq;
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if (!np) {
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dev_err(&pdev->dev, "No Device Tree node found\n");
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return -EINVAL;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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tc3589x_gpio = devm_kzalloc(&pdev->dev, sizeof(struct tc3589x_gpio),
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GFP_KERNEL);
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if (!tc3589x_gpio)
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return -ENOMEM;
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mutex_init(&tc3589x_gpio->irq_lock);
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tc3589x_gpio->dev = &pdev->dev;
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tc3589x_gpio->tc3589x = tc3589x;
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tc3589x_gpio->chip = template_chip;
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tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
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tc3589x_gpio->chip.parent = &pdev->dev;
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tc3589x_gpio->chip.base = -1;
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tc3589x_gpio->chip.of_node = np;
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/* Bring the GPIO module out of reset */
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ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
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TC3589x_RSTCTRL_GPIRST, 0);
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if (ret < 0)
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return ret;
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ret = devm_request_threaded_irq(&pdev->dev,
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irq, NULL, tc3589x_gpio_irq,
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IRQF_ONESHOT, "tc3589x-gpio",
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tc3589x_gpio);
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if (ret) {
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dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
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return ret;
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}
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ret = gpiochip_add(&tc3589x_gpio->chip);
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if (ret) {
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dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
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return ret;
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}
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ret = gpiochip_irqchip_add(&tc3589x_gpio->chip,
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&tc3589x_gpio_irq_chip,
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0,
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handle_simple_irq,
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IRQ_TYPE_NONE);
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if (ret) {
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dev_err(&pdev->dev,
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"could not connect irqchip to gpiochip\n");
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return ret;
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}
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gpiochip_set_chained_irqchip(&tc3589x_gpio->chip,
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&tc3589x_gpio_irq_chip,
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irq,
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NULL);
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platform_set_drvdata(pdev, tc3589x_gpio);
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return 0;
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}
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static int tc3589x_gpio_remove(struct platform_device *pdev)
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{
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struct tc3589x_gpio *tc3589x_gpio = platform_get_drvdata(pdev);
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gpiochip_remove(&tc3589x_gpio->chip);
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return 0;
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}
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static struct platform_driver tc3589x_gpio_driver = {
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.driver.name = "tc3589x-gpio",
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.driver.owner = THIS_MODULE,
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.probe = tc3589x_gpio_probe,
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.remove = tc3589x_gpio_remove,
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};
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static int __init tc3589x_gpio_init(void)
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{
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return platform_driver_register(&tc3589x_gpio_driver);
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}
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subsys_initcall(tc3589x_gpio_init);
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static void __exit tc3589x_gpio_exit(void)
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{
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platform_driver_unregister(&tc3589x_gpio_driver);
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}
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module_exit(tc3589x_gpio_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("TC3589x GPIO driver");
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MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
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