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Add bcm2708_gpio driver
Signed-off-by: popcornmix <popcornmix@gmail.com> bcm2708: Add extension to configure internal pulls The bcm2708 gpio controller supports internal pulls to be used as pull-up, pull-down or being entirely disabled. As it can be useful for a driver to change the pull configuration from it's default pull-down state, add an extension which allows configuring the pull per gpio. Signed-off-by: Julian Scheel <julian@jusst.de> bcm2708-gpio: Revert the use of pinctrl_request_gpio In non-DT systems, pinctrl_request_gpio always fails causing "requests probe deferral" messages. In DT systems, it isn't useful because the reference counting is independent of the normal pinctrl pin reservations. gpio: Only clear the currently occurring interrupt. Avoids losing interrupts See: linux #760 bcm2708_gpio: Avoid calling irq_unmask for all interrupts When setting up the interrupts, specify that the handle_simple_irq handler should be used. This leaves interrupt acknowledgement to the caller, and prevents irq_unmask from being called for all interrupts. Issue: linux #760
This commit is contained in:
popcornmix
@@ -9,6 +9,14 @@ config MACH_BCM2708
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help
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Include support for the Broadcom(R) BCM2708 platform.
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config BCM2708_GPIO
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bool "BCM2708 gpio support"
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depends on MACH_BCM2708
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select ARCH_REQUIRE_GPIOLIB
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default y
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help
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Include support for the Broadcom(R) BCM2708 gpio.
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config BCM2708_VCMEM
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bool "Videocore Memory"
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depends on MACH_BCM2708
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@@ -3,4 +3,5 @@
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#
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obj-$(CONFIG_MACH_BCM2708) += clock.o bcm2708.o armctrl.o vcio.o power.o dma.o
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obj-$(CONFIG_BCM2708_GPIO) += bcm2708_gpio.o
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obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
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@@ -331,6 +331,31 @@ static struct platform_device bcm2708_vcio_device = {
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},
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};
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#ifdef CONFIG_BCM2708_GPIO
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#define BCM_GPIO_DRIVER_NAME "bcm2708_gpio"
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static struct resource bcm2708_gpio_resources[] = {
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[0] = { /* general purpose I/O */
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.start = GPIO_BASE,
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.end = GPIO_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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static u64 gpio_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
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static struct platform_device bcm2708_gpio_device = {
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.name = BCM_GPIO_DRIVER_NAME,
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.id = -1, /* only one VideoCore I/O area */
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.resource = bcm2708_gpio_resources,
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.num_resources = ARRAY_SIZE(bcm2708_gpio_resources),
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.dev = {
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.dma_mask = &gpio_dmamask,
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.coherent_dma_mask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON),
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},
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};
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#endif
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static struct resource bcm2708_systemtimer_resources[] = {
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[0] = { /* system timer access */
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.start = ST_BASE,
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@@ -473,6 +498,9 @@ void __init bcm2708_init(void)
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bcm_register_device(&bcm2708_dmaman_device);
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bcm_register_device(&bcm2708_vcio_device);
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#ifdef CONFIG_BCM2708_GPIO
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bcm_register_device(&bcm2708_gpio_device);
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#endif
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bcm_register_device(&bcm2708_systemtimer_device);
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bcm_register_device(&bcm2708_fb_device);
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bcm_register_device(&bcm2708_usb_device);
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426
arch/arm/mach-bcm2708/bcm2708_gpio.c
Normal file
426
arch/arm/mach-bcm2708/bcm2708_gpio.c
Normal file
@@ -0,0 +1,426 @@
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/*
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* linux/arch/arm/mach-bcm2708/bcm2708_gpio.c
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*
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* Copyright (C) 2010 Broadcom
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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 version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <mach/gpio.h>
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#include <linux/gpio.h>
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#include <linux/platform_device.h>
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#include <mach/platform.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_data/bcm2708.h>
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#define BCM_GPIO_DRIVER_NAME "bcm2708_gpio"
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#define DRIVER_NAME BCM_GPIO_DRIVER_NAME
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#define BCM_GPIO_USE_IRQ 1
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#define GPIOFSEL(x) (0x00+(x)*4)
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#define GPIOSET(x) (0x1c+(x)*4)
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#define GPIOCLR(x) (0x28+(x)*4)
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#define GPIOLEV(x) (0x34+(x)*4)
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#define GPIOEDS(x) (0x40+(x)*4)
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#define GPIOREN(x) (0x4c+(x)*4)
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#define GPIOFEN(x) (0x58+(x)*4)
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#define GPIOHEN(x) (0x64+(x)*4)
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#define GPIOLEN(x) (0x70+(x)*4)
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#define GPIOAREN(x) (0x7c+(x)*4)
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#define GPIOAFEN(x) (0x88+(x)*4)
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#define GPIOUD(x) (0x94+(x)*4)
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#define GPIOUDCLK(x) (0x98+(x)*4)
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#define GPIO_BANKS 2
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enum { GPIO_FSEL_INPUT, GPIO_FSEL_OUTPUT,
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GPIO_FSEL_ALT5, GPIO_FSEL_ALT_4,
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GPIO_FSEL_ALT0, GPIO_FSEL_ALT1,
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GPIO_FSEL_ALT2, GPIO_FSEL_ALT3,
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};
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/* Each of the two spinlocks protects a different set of hardware
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* regiters and data structurs. This decouples the code of the IRQ from
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* the GPIO code. This also makes the case of a GPIO routine call from
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* the IRQ code simpler.
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*/
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static DEFINE_SPINLOCK(lock); /* GPIO registers */
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struct bcm2708_gpio {
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struct list_head list;
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void __iomem *base;
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struct gpio_chip gc;
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unsigned long rising[(BCM2708_NR_GPIOS + 31) / 32];
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unsigned long falling[(BCM2708_NR_GPIOS + 31) / 32];
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unsigned long high[(BCM2708_NR_GPIOS + 31) / 32];
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unsigned long low[(BCM2708_NR_GPIOS + 31) / 32];
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};
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static int bcm2708_set_function(struct gpio_chip *gc, unsigned offset,
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int function)
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{
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struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
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unsigned long flags;
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unsigned gpiodir;
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unsigned gpio_bank = offset / 10;
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unsigned gpio_field_offset = (offset - 10 * gpio_bank) * 3;
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//printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_set_function %p (%d,%d)\n", gc, offset, function);
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if (offset >= BCM2708_NR_GPIOS)
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return -EINVAL;
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spin_lock_irqsave(&lock, flags);
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gpiodir = readl(gpio->base + GPIOFSEL(gpio_bank));
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gpiodir &= ~(7 << gpio_field_offset);
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gpiodir |= function << gpio_field_offset;
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writel(gpiodir, gpio->base + GPIOFSEL(gpio_bank));
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spin_unlock_irqrestore(&lock, flags);
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gpiodir = readl(gpio->base + GPIOFSEL(gpio_bank));
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return 0;
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}
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static int bcm2708_gpio_dir_in(struct gpio_chip *gc, unsigned offset)
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{
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return bcm2708_set_function(gc, offset, GPIO_FSEL_INPUT);
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}
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static void bcm2708_gpio_set(struct gpio_chip *gc, unsigned offset, int value);
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static int bcm2708_gpio_dir_out(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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int ret;
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ret = bcm2708_set_function(gc, offset, GPIO_FSEL_OUTPUT);
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if (ret >= 0)
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bcm2708_gpio_set(gc, offset, value);
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return ret;
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}
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static int bcm2708_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
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unsigned gpio_bank = offset / 32;
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unsigned gpio_field_offset = (offset - 32 * gpio_bank);
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unsigned lev;
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if (offset >= BCM2708_NR_GPIOS)
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return 0;
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lev = readl(gpio->base + GPIOLEV(gpio_bank));
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//printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_get %p (%d)=%d\n", gc, offset, 0x1 & (lev>>gpio_field_offset));
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return 0x1 & (lev >> gpio_field_offset);
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}
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static void bcm2708_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
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{
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struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
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unsigned gpio_bank = offset / 32;
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unsigned gpio_field_offset = (offset - 32 * gpio_bank);
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//printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_set %p (%d=%d)\n", gc, offset, value);
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if (offset >= BCM2708_NR_GPIOS)
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return;
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if (value)
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writel(1 << gpio_field_offset, gpio->base + GPIOSET(gpio_bank));
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else
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writel(1 << gpio_field_offset, gpio->base + GPIOCLR(gpio_bank));
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}
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/**********************
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* extension to configure pullups
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*/
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int bcm2708_gpio_setpull(struct gpio_chip *gc, unsigned offset,
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bcm2708_gpio_pull_t value)
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{
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struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
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unsigned gpio_bank = offset / 32;
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unsigned gpio_field_offset = (offset - 32 * gpio_bank);
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if (offset >= BCM2708_NR_GPIOS)
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return -EINVAL;
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switch (value) {
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case BCM2708_PULL_UP:
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writel(2, gpio->base + GPIOUD(0));
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break;
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case BCM2708_PULL_DOWN:
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writel(1, gpio->base + GPIOUD(0));
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break;
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case BCM2708_PULL_OFF:
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writel(0, gpio->base + GPIOUD(0));
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break;
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}
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udelay(5);
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writel(1 << gpio_field_offset, gpio->base + GPIOUDCLK(gpio_bank));
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udelay(5);
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writel(0, gpio->base + GPIOUD(0));
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writel(0 << gpio_field_offset, gpio->base + GPIOUDCLK(gpio_bank));
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return 0;
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}
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EXPORT_SYMBOL(bcm2708_gpio_setpull);
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/*************************************************************************************************************************
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* bcm2708 GPIO IRQ
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*/
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#if BCM_GPIO_USE_IRQ
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static int bcm2708_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
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{
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return gpio_to_irq(gpio);
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}
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static int bcm2708_gpio_irq_set_type(struct irq_data *d, unsigned type)
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{
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unsigned irq = d->irq;
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struct bcm2708_gpio *gpio = irq_get_chip_data(irq);
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unsigned gn = irq_to_gpio(irq);
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unsigned gb = gn / 32;
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unsigned go = gn % 32;
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gpio->rising[gb] &= ~(1 << go);
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gpio->falling[gb] &= ~(1 << go);
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gpio->high[gb] &= ~(1 << go);
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gpio->low[gb] &= ~(1 << go);
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if (type & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
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return -EINVAL;
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if (type & IRQ_TYPE_EDGE_RISING)
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gpio->rising[gb] |= (1 << go);
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if (type & IRQ_TYPE_EDGE_FALLING)
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gpio->falling[gb] |= (1 << go);
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if (type & IRQ_TYPE_LEVEL_HIGH)
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gpio->high[gb] |= (1 << go);
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if (type & IRQ_TYPE_LEVEL_LOW)
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gpio->low[gb] |= (1 << go);
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return 0;
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}
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static void bcm2708_gpio_irq_mask(struct irq_data *d)
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{
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unsigned irq = d->irq;
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struct bcm2708_gpio *gpio = irq_get_chip_data(irq);
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unsigned gn = irq_to_gpio(irq);
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unsigned gb = gn / 32;
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unsigned long rising = readl(gpio->base + GPIOREN(gb));
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unsigned long falling = readl(gpio->base + GPIOFEN(gb));
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unsigned long high = readl(gpio->base + GPIOHEN(gb));
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unsigned long low = readl(gpio->base + GPIOLEN(gb));
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gn = gn % 32;
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writel(rising & ~(1 << gn), gpio->base + GPIOREN(gb));
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writel(falling & ~(1 << gn), gpio->base + GPIOFEN(gb));
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writel(high & ~(1 << gn), gpio->base + GPIOHEN(gb));
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writel(low & ~(1 << gn), gpio->base + GPIOLEN(gb));
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}
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static void bcm2708_gpio_irq_unmask(struct irq_data *d)
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{
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unsigned irq = d->irq;
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struct bcm2708_gpio *gpio = irq_get_chip_data(irq);
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unsigned gn = irq_to_gpio(irq);
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unsigned gb = gn / 32;
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unsigned go = gn % 32;
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unsigned long rising = readl(gpio->base + GPIOREN(gb));
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unsigned long falling = readl(gpio->base + GPIOFEN(gb));
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unsigned long high = readl(gpio->base + GPIOHEN(gb));
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unsigned long low = readl(gpio->base + GPIOLEN(gb));
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if (gpio->rising[gb] & (1 << go)) {
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writel(rising | (1 << go), gpio->base + GPIOREN(gb));
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} else {
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writel(rising & ~(1 << go), gpio->base + GPIOREN(gb));
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}
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if (gpio->falling[gb] & (1 << go)) {
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writel(falling | (1 << go), gpio->base + GPIOFEN(gb));
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} else {
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writel(falling & ~(1 << go), gpio->base + GPIOFEN(gb));
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}
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if (gpio->high[gb] & (1 << go)) {
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writel(high | (1 << go), gpio->base + GPIOHEN(gb));
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} else {
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writel(high & ~(1 << go), gpio->base + GPIOHEN(gb));
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}
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if (gpio->low[gb] & (1 << go)) {
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writel(low | (1 << go), gpio->base + GPIOLEN(gb));
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} else {
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writel(low & ~(1 << go), gpio->base + GPIOLEN(gb));
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}
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}
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static struct irq_chip bcm2708_irqchip = {
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.name = "GPIO",
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.irq_enable = bcm2708_gpio_irq_unmask,
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.irq_disable = bcm2708_gpio_irq_mask,
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.irq_unmask = bcm2708_gpio_irq_unmask,
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.irq_mask = bcm2708_gpio_irq_mask,
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.irq_set_type = bcm2708_gpio_irq_set_type,
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};
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static irqreturn_t bcm2708_gpio_interrupt(int irq, void *dev_id)
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{
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unsigned long edsr;
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unsigned bank;
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int i;
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unsigned gpio;
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unsigned level_bits;
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struct bcm2708_gpio *gpio_data = dev_id;
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for (bank = 0; bank < GPIO_BANKS; bank++) {
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edsr = readl(__io_address(GPIO_BASE) + GPIOEDS(bank));
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level_bits = gpio_data->high[bank] | gpio_data->low[bank];
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for_each_set_bit(i, &edsr, 32) {
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gpio = i + bank * 32;
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/* ack edge triggered IRQs immediately */
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if (!(level_bits & (1<<i)))
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writel(1<<i,
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__io_address(GPIO_BASE) + GPIOEDS(bank));
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generic_handle_irq(gpio_to_irq(gpio));
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/* ack level triggered IRQ after handling them */
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if (level_bits & (1<<i))
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writel(1<<i,
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__io_address(GPIO_BASE) + GPIOEDS(bank));
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}
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}
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return IRQ_HANDLED;
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}
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static struct irqaction bcm2708_gpio_irq = {
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.name = "BCM2708 GPIO catchall handler",
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.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
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.handler = bcm2708_gpio_interrupt,
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};
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static void bcm2708_gpio_irq_init(struct bcm2708_gpio *ucb)
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{
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unsigned irq;
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ucb->gc.to_irq = bcm2708_gpio_to_irq;
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for (irq = GPIO_IRQ_START; irq < (GPIO_IRQ_START + GPIO_IRQS); irq++) {
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irq_set_chip_data(irq, ucb);
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irq_set_chip_and_handler(irq, &bcm2708_irqchip,
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handle_simple_irq);
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set_irq_flags(irq, IRQF_VALID);
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}
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bcm2708_gpio_irq.dev_id = ucb;
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setup_irq(IRQ_GPIO3, &bcm2708_gpio_irq);
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}
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#else
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static void bcm2708_gpio_irq_init(struct bcm2708_gpio *ucb)
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{
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}
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#endif /* #if BCM_GPIO_USE_IRQ ***************************************************************************************************************** */
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static int bcm2708_gpio_probe(struct platform_device *dev)
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{
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struct bcm2708_gpio *ucb;
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struct resource *res;
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int bank;
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int err = 0;
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printk(KERN_INFO DRIVER_NAME ": bcm2708_gpio_probe %p\n", dev);
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|
||||
ucb = kzalloc(sizeof(*ucb), GFP_KERNEL);
|
||||
if (NULL == ucb) {
|
||||
printk(KERN_ERR DRIVER_NAME ": failed to allocate "
|
||||
"mailbox memory\n");
|
||||
err = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
|
||||
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
|
||||
|
||||
platform_set_drvdata(dev, ucb);
|
||||
ucb->base = __io_address(GPIO_BASE);
|
||||
|
||||
ucb->gc.label = "bcm2708_gpio";
|
||||
ucb->gc.base = 0;
|
||||
ucb->gc.ngpio = BCM2708_NR_GPIOS;
|
||||
ucb->gc.owner = THIS_MODULE;
|
||||
|
||||
ucb->gc.direction_input = bcm2708_gpio_dir_in;
|
||||
ucb->gc.direction_output = bcm2708_gpio_dir_out;
|
||||
ucb->gc.get = bcm2708_gpio_get;
|
||||
ucb->gc.set = bcm2708_gpio_set;
|
||||
ucb->gc.can_sleep = 0;
|
||||
|
||||
for (bank = 0; bank < GPIO_BANKS; bank++) {
|
||||
writel(0, ucb->base + GPIOREN(bank));
|
||||
writel(0, ucb->base + GPIOFEN(bank));
|
||||
writel(0, ucb->base + GPIOHEN(bank));
|
||||
writel(0, ucb->base + GPIOLEN(bank));
|
||||
writel(0, ucb->base + GPIOAREN(bank));
|
||||
writel(0, ucb->base + GPIOAFEN(bank));
|
||||
writel(~0, ucb->base + GPIOEDS(bank));
|
||||
}
|
||||
|
||||
bcm2708_gpio_irq_init(ucb);
|
||||
|
||||
err = gpiochip_add(&ucb->gc);
|
||||
|
||||
err:
|
||||
return err;
|
||||
|
||||
}
|
||||
|
||||
static int bcm2708_gpio_remove(struct platform_device *dev)
|
||||
{
|
||||
int err = 0;
|
||||
struct bcm2708_gpio *ucb = platform_get_drvdata(dev);
|
||||
|
||||
printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_remove %p\n", dev);
|
||||
|
||||
gpiochip_remove(&ucb->gc);
|
||||
|
||||
platform_set_drvdata(dev, NULL);
|
||||
kfree(ucb);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct platform_driver bcm2708_gpio_driver = {
|
||||
.probe = bcm2708_gpio_probe,
|
||||
.remove = bcm2708_gpio_remove,
|
||||
.driver = {
|
||||
.name = "bcm2708_gpio"},
|
||||
};
|
||||
|
||||
static int __init bcm2708_gpio_init(void)
|
||||
{
|
||||
return platform_driver_register(&bcm2708_gpio_driver);
|
||||
}
|
||||
|
||||
static void __exit bcm2708_gpio_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&bcm2708_gpio_driver);
|
||||
}
|
||||
|
||||
module_init(bcm2708_gpio_init);
|
||||
module_exit(bcm2708_gpio_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Broadcom BCM2708 GPIO driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
17
arch/arm/mach-bcm2708/include/mach/gpio.h
Normal file
17
arch/arm/mach-bcm2708/include/mach/gpio.h
Normal file
@@ -0,0 +1,17 @@
|
||||
/*
|
||||
* arch/arm/mach-bcm2708/include/mach/gpio.h
|
||||
*
|
||||
* This file is licensed under the terms of the GNU General Public
|
||||
* License version 2. This program is licensed "as is" without any
|
||||
* warranty of any kind, whether express or implied.
|
||||
*/
|
||||
|
||||
#ifndef __ASM_ARCH_GPIO_H
|
||||
#define __ASM_ARCH_GPIO_H
|
||||
|
||||
#define BCM2708_NR_GPIOS 54 // number of gpio lines
|
||||
|
||||
#define gpio_to_irq(x) ((x) + GPIO_IRQ_START)
|
||||
#define irq_to_gpio(x) ((x) - GPIO_IRQ_START)
|
||||
|
||||
#endif
|
||||
23
include/linux/platform_data/bcm2708.h
Normal file
23
include/linux/platform_data/bcm2708.h
Normal file
@@ -0,0 +1,23 @@
|
||||
/*
|
||||
* include/linux/platform_data/bcm2708.h
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* (C) 2014 Julian Scheel <julian@jusst.de>
|
||||
*
|
||||
*/
|
||||
#ifndef __BCM2708_H_
|
||||
#define __BCM2708_H_
|
||||
|
||||
typedef enum {
|
||||
BCM2708_PULL_OFF,
|
||||
BCM2708_PULL_UP,
|
||||
BCM2708_PULL_DOWN
|
||||
} bcm2708_gpio_pull_t;
|
||||
|
||||
extern int bcm2708_gpio_setpull(struct gpio_chip *gc, unsigned offset,
|
||||
bcm2708_gpio_pull_t value);
|
||||
|
||||
#endif
|
||||
Reference in New Issue
Block a user