forked from luck/tmp_suning_uos_patched
f759921cfb
When a threaded irq handler is chained attached to one of the gpio pins when configure for level irq the altera_gpio_irq_leveL_high_handler does not mask the interrupt while being handled by the chained irq. This resulting in the threaded irq not getting enough cycles to complete quickly enough before the irq was disabled as faulty. handle_level_irq should be used in this situation instead of handle_simple_irq. In gpiochip_irqchip_add set default handler to handle_bad_irq as per Documentation/gpio/driver.txt. Then set the correct handler in the set_type callback. Signed-off-by: Phil Reid <preid@electromag.com.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
372 lines
10 KiB
C
372 lines
10 KiB
C
/*
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* Copyright (C) 2013 Altera Corporation
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* Based on gpio-mpc8xxx.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#define ALTERA_GPIO_MAX_NGPIO 32
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#define ALTERA_GPIO_DATA 0x0
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#define ALTERA_GPIO_DIR 0x4
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#define ALTERA_GPIO_IRQ_MASK 0x8
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#define ALTERA_GPIO_EDGE_CAP 0xc
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/**
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* struct altera_gpio_chip
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* @mmchip : memory mapped chip structure.
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* @gpio_lock : synchronization lock so that new irq/set/get requests
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will be blocked until the current one completes.
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* @interrupt_trigger : specifies the hardware configured IRQ trigger type
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(rising, falling, both, high)
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* @mapped_irq : kernel mapped irq number.
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*/
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struct altera_gpio_chip {
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struct of_mm_gpio_chip mmchip;
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spinlock_t gpio_lock;
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int interrupt_trigger;
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int mapped_irq;
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};
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static void altera_gpio_irq_unmask(struct irq_data *d)
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{
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struct altera_gpio_chip *altera_gc;
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struct of_mm_gpio_chip *mm_gc;
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unsigned long flags;
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u32 intmask;
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altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
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mm_gc = &altera_gc->mmchip;
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spin_lock_irqsave(&altera_gc->gpio_lock, flags);
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intmask = readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
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/* Set ALTERA_GPIO_IRQ_MASK bit to unmask */
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intmask |= BIT(irqd_to_hwirq(d));
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writel(intmask, mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
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spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
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}
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static void altera_gpio_irq_mask(struct irq_data *d)
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{
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struct altera_gpio_chip *altera_gc;
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struct of_mm_gpio_chip *mm_gc;
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unsigned long flags;
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u32 intmask;
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altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
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mm_gc = &altera_gc->mmchip;
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spin_lock_irqsave(&altera_gc->gpio_lock, flags);
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intmask = readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
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/* Clear ALTERA_GPIO_IRQ_MASK bit to mask */
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intmask &= ~BIT(irqd_to_hwirq(d));
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writel(intmask, mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
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spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
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}
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/**
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* This controller's IRQ type is synthesized in hardware, so this function
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* just checks if the requested set_type matches the synthesized IRQ type
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*/
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static int altera_gpio_irq_set_type(struct irq_data *d,
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unsigned int type)
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{
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struct altera_gpio_chip *altera_gc;
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altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d));
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if (type == IRQ_TYPE_NONE) {
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irq_set_handler_locked(d, handle_bad_irq);
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return 0;
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}
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if (type == altera_gc->interrupt_trigger) {
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if (type == IRQ_TYPE_LEVEL_HIGH)
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irq_set_handler_locked(d, handle_level_irq);
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else
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irq_set_handler_locked(d, handle_simple_irq);
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return 0;
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}
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irq_set_handler_locked(d, handle_bad_irq);
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return -EINVAL;
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}
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static unsigned int altera_gpio_irq_startup(struct irq_data *d)
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{
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altera_gpio_irq_unmask(d);
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return 0;
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}
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static struct irq_chip altera_irq_chip = {
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.name = "altera-gpio",
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.irq_mask = altera_gpio_irq_mask,
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.irq_unmask = altera_gpio_irq_unmask,
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.irq_set_type = altera_gpio_irq_set_type,
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.irq_startup = altera_gpio_irq_startup,
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.irq_shutdown = altera_gpio_irq_mask,
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};
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static int altera_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct of_mm_gpio_chip *mm_gc;
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mm_gc = to_of_mm_gpio_chip(gc);
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return !!(readl(mm_gc->regs + ALTERA_GPIO_DATA) & BIT(offset));
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}
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static void altera_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
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{
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struct of_mm_gpio_chip *mm_gc;
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struct altera_gpio_chip *chip;
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unsigned long flags;
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unsigned int data_reg;
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mm_gc = to_of_mm_gpio_chip(gc);
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chip = gpiochip_get_data(gc);
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spin_lock_irqsave(&chip->gpio_lock, flags);
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data_reg = readl(mm_gc->regs + ALTERA_GPIO_DATA);
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if (value)
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data_reg |= BIT(offset);
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else
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data_reg &= ~BIT(offset);
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writel(data_reg, mm_gc->regs + ALTERA_GPIO_DATA);
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spin_unlock_irqrestore(&chip->gpio_lock, flags);
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}
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static int altera_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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struct of_mm_gpio_chip *mm_gc;
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struct altera_gpio_chip *chip;
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unsigned long flags;
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unsigned int gpio_ddr;
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mm_gc = to_of_mm_gpio_chip(gc);
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chip = gpiochip_get_data(gc);
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spin_lock_irqsave(&chip->gpio_lock, flags);
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/* Set pin as input, assumes software controlled IP */
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gpio_ddr = readl(mm_gc->regs + ALTERA_GPIO_DIR);
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gpio_ddr &= ~BIT(offset);
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writel(gpio_ddr, mm_gc->regs + ALTERA_GPIO_DIR);
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spin_unlock_irqrestore(&chip->gpio_lock, flags);
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return 0;
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}
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static int altera_gpio_direction_output(struct gpio_chip *gc,
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unsigned offset, int value)
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{
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struct of_mm_gpio_chip *mm_gc;
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struct altera_gpio_chip *chip;
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unsigned long flags;
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unsigned int data_reg, gpio_ddr;
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mm_gc = to_of_mm_gpio_chip(gc);
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chip = gpiochip_get_data(gc);
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spin_lock_irqsave(&chip->gpio_lock, flags);
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/* Sets the GPIO value */
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data_reg = readl(mm_gc->regs + ALTERA_GPIO_DATA);
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if (value)
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data_reg |= BIT(offset);
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else
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data_reg &= ~BIT(offset);
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writel(data_reg, mm_gc->regs + ALTERA_GPIO_DATA);
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/* Set pin as output, assumes software controlled IP */
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gpio_ddr = readl(mm_gc->regs + ALTERA_GPIO_DIR);
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gpio_ddr |= BIT(offset);
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writel(gpio_ddr, mm_gc->regs + ALTERA_GPIO_DIR);
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spin_unlock_irqrestore(&chip->gpio_lock, flags);
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return 0;
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}
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static void altera_gpio_irq_edge_handler(struct irq_desc *desc)
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{
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struct altera_gpio_chip *altera_gc;
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struct irq_chip *chip;
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struct of_mm_gpio_chip *mm_gc;
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struct irq_domain *irqdomain;
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unsigned long status;
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int i;
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altera_gc = gpiochip_get_data(irq_desc_get_handler_data(desc));
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chip = irq_desc_get_chip(desc);
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mm_gc = &altera_gc->mmchip;
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irqdomain = altera_gc->mmchip.gc.irqdomain;
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chained_irq_enter(chip, desc);
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while ((status =
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(readl(mm_gc->regs + ALTERA_GPIO_EDGE_CAP) &
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readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK)))) {
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writel(status, mm_gc->regs + ALTERA_GPIO_EDGE_CAP);
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for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
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generic_handle_irq(irq_find_mapping(irqdomain, i));
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}
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}
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chained_irq_exit(chip, desc);
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}
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static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc)
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{
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struct altera_gpio_chip *altera_gc;
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struct irq_chip *chip;
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struct of_mm_gpio_chip *mm_gc;
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struct irq_domain *irqdomain;
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unsigned long status;
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int i;
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altera_gc = gpiochip_get_data(irq_desc_get_handler_data(desc));
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chip = irq_desc_get_chip(desc);
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mm_gc = &altera_gc->mmchip;
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irqdomain = altera_gc->mmchip.gc.irqdomain;
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chained_irq_enter(chip, desc);
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status = readl(mm_gc->regs + ALTERA_GPIO_DATA);
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status &= readl(mm_gc->regs + ALTERA_GPIO_IRQ_MASK);
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for_each_set_bit(i, &status, mm_gc->gc.ngpio) {
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generic_handle_irq(irq_find_mapping(irqdomain, i));
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}
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chained_irq_exit(chip, desc);
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}
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static int altera_gpio_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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int reg, ret;
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struct altera_gpio_chip *altera_gc;
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altera_gc = devm_kzalloc(&pdev->dev, sizeof(*altera_gc), GFP_KERNEL);
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if (!altera_gc)
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return -ENOMEM;
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spin_lock_init(&altera_gc->gpio_lock);
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if (of_property_read_u32(node, "altr,ngpio", ®))
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/* By default assume maximum ngpio */
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altera_gc->mmchip.gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
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else
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altera_gc->mmchip.gc.ngpio = reg;
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if (altera_gc->mmchip.gc.ngpio > ALTERA_GPIO_MAX_NGPIO) {
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dev_warn(&pdev->dev,
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"ngpio is greater than %d, defaulting to %d\n",
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ALTERA_GPIO_MAX_NGPIO, ALTERA_GPIO_MAX_NGPIO);
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altera_gc->mmchip.gc.ngpio = ALTERA_GPIO_MAX_NGPIO;
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}
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altera_gc->mmchip.gc.direction_input = altera_gpio_direction_input;
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altera_gc->mmchip.gc.direction_output = altera_gpio_direction_output;
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altera_gc->mmchip.gc.get = altera_gpio_get;
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altera_gc->mmchip.gc.set = altera_gpio_set;
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altera_gc->mmchip.gc.owner = THIS_MODULE;
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altera_gc->mmchip.gc.parent = &pdev->dev;
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ret = of_mm_gpiochip_add_data(node, &altera_gc->mmchip, altera_gc);
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if (ret) {
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dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n");
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return ret;
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}
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platform_set_drvdata(pdev, altera_gc);
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altera_gc->mapped_irq = platform_get_irq(pdev, 0);
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if (altera_gc->mapped_irq < 0)
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goto skip_irq;
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if (of_property_read_u32(node, "altr,interrupt-type", ®)) {
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ret = -EINVAL;
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dev_err(&pdev->dev,
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"altr,interrupt-type value not set in device tree\n");
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goto teardown;
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}
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altera_gc->interrupt_trigger = reg;
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ret = gpiochip_irqchip_add(&altera_gc->mmchip.gc, &altera_irq_chip, 0,
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handle_bad_irq, IRQ_TYPE_NONE);
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if (ret) {
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dev_err(&pdev->dev, "could not add irqchip\n");
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goto teardown;
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}
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gpiochip_set_chained_irqchip(&altera_gc->mmchip.gc,
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&altera_irq_chip,
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altera_gc->mapped_irq,
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altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH ?
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altera_gpio_irq_leveL_high_handler :
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altera_gpio_irq_edge_handler);
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skip_irq:
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return 0;
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teardown:
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of_mm_gpiochip_remove(&altera_gc->mmchip);
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pr_err("%s: registration failed with status %d\n",
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node->full_name, ret);
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return ret;
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}
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static int altera_gpio_remove(struct platform_device *pdev)
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{
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struct altera_gpio_chip *altera_gc = platform_get_drvdata(pdev);
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of_mm_gpiochip_remove(&altera_gc->mmchip);
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return 0;
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}
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static const struct of_device_id altera_gpio_of_match[] = {
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{ .compatible = "altr,pio-1.0", },
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{},
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};
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MODULE_DEVICE_TABLE(of, altera_gpio_of_match);
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static struct platform_driver altera_gpio_driver = {
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.driver = {
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.name = "altera_gpio",
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.of_match_table = of_match_ptr(altera_gpio_of_match),
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},
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.probe = altera_gpio_probe,
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.remove = altera_gpio_remove,
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};
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static int __init altera_gpio_init(void)
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{
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return platform_driver_register(&altera_gpio_driver);
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}
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subsys_initcall(altera_gpio_init);
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static void __exit altera_gpio_exit(void)
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{
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platform_driver_unregister(&altera_gpio_driver);
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}
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module_exit(altera_gpio_exit);
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MODULE_AUTHOR("Tien Hock Loh <thloh@altera.com>");
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MODULE_DESCRIPTION("Altera GPIO driver");
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MODULE_LICENSE("GPL");
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