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authorAlessandro Rubini <rubini@gnudd.com>2009-07-02 15:29:12 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-07-02 21:20:45 +0100
commit2ec1d3594563e0283873e24bb5d100dffee5d568 (patch)
tree30b6ac6d374fac8fdf97caa7fc025015c52d0ffa /arch/arm/mach-nomadik
parent28ad94ec61dc60207dbffdb95ff870c617fbb832 (diff)
[ARM] 5584/1: nomadik: add gpio driver and devices
Signed-off-by: Alessandro Rubini <rubini@unipv.it> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-nomadik')
-rw-r--r--arch/arm/mach-nomadik/Makefile2
-rw-r--r--arch/arm/mach-nomadik/cpu-8815.c75
-rw-r--r--arch/arm/mach-nomadik/gpio.c396
-rw-r--r--arch/arm/mach-nomadik/include/mach/gpio.h71
4 files changed, 543 insertions, 1 deletions
diff --git a/arch/arm/mach-nomadik/Makefile b/arch/arm/mach-nomadik/Makefile
index fa97769fe707..3fc43543e6e7 100644
--- a/arch/arm/mach-nomadik/Makefile
+++ b/arch/arm/mach-nomadik/Makefile
@@ -7,7 +7,7 @@
# Object file lists.
-obj-y += clock.o timer.o
+obj-y += clock.o timer.o gpio.o
# Cpu revision
obj-$(CONFIG_NOMADIK_8815) += cpu-8815.o
diff --git a/arch/arm/mach-nomadik/cpu-8815.c b/arch/arm/mach-nomadik/cpu-8815.c
index dec42da6956a..9917a9abdb52 100644
--- a/arch/arm/mach-nomadik/cpu-8815.c
+++ b/arch/arm/mach-nomadik/cpu-8815.c
@@ -19,12 +19,87 @@
#include <linux/types.h>
#include <linux/init.h>
#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/gpio.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <asm/mach/map.h>
#include <asm/hardware/vic.h>
+/* The 8815 has 4 GPIO blocks, let's register them immediately */
+static struct nmk_gpio_platform_data cpu8815_gpio[] = {
+ {
+ .name = "GPIO-0-31",
+ .first_gpio = 0,
+ .first_irq = NOMADIK_GPIO_TO_IRQ(0),
+ .parent_irq = IRQ_GPIO0,
+ }, {
+ .name = "GPIO-32-63",
+ .first_gpio = 32,
+ .first_irq = NOMADIK_GPIO_TO_IRQ(32),
+ .parent_irq = IRQ_GPIO1,
+ }, {
+ .name = "GPIO-64-95",
+ .first_gpio = 64,
+ .first_irq = NOMADIK_GPIO_TO_IRQ(64),
+ .parent_irq = IRQ_GPIO2,
+ }, {
+ .name = "GPIO-96-127", /* 124..127 not routed to pin */
+ .first_gpio = 96,
+ .first_irq = NOMADIK_GPIO_TO_IRQ(96),
+ .parent_irq = IRQ_GPIO3,
+ }
+};
+
+#define __MEM_4K_RESOURCE(x) \
+ .res = {.start = (x), .end = (x) + SZ_4K - 1, .flags = IORESOURCE_MEM}
+
+static struct amba_device cpu8815_amba_gpio[] = {
+ {
+ .dev = {
+ .init_name = "gpio0",
+ .platform_data = cpu8815_gpio + 0,
+ },
+ __MEM_4K_RESOURCE(NOMADIK_GPIO0_BASE),
+ }, {
+ .dev = {
+ .init_name = "gpio1",
+ .platform_data = cpu8815_gpio + 1,
+ },
+ __MEM_4K_RESOURCE(NOMADIK_GPIO1_BASE),
+ }, {
+ .dev = {
+ .init_name = "gpio2",
+ .platform_data = cpu8815_gpio + 2,
+ },
+ __MEM_4K_RESOURCE(NOMADIK_GPIO2_BASE),
+ }, {
+ .dev = {
+ .init_name = "gpio3",
+ .platform_data = cpu8815_gpio + 3,
+ },
+ __MEM_4K_RESOURCE(NOMADIK_GPIO3_BASE),
+ },
+};
+
+static struct amba_device *amba_devs[] __initdata = {
+ cpu8815_amba_gpio + 0,
+ cpu8815_amba_gpio + 1,
+ cpu8815_amba_gpio + 2,
+ cpu8815_amba_gpio + 3,
+};
+
+static int __init cpu8815_init(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(amba_devs); i++)
+ amba_device_register(amba_devs[i], &iomem_resource);
+ return 0;
+}
+arch_initcall(cpu8815_init);
+
/* All SoC devices live in the same area (see hardware.h) */
static struct map_desc nomadik_io_desc[] __initdata = {
{
diff --git a/arch/arm/mach-nomadik/gpio.c b/arch/arm/mach-nomadik/gpio.c
new file mode 100644
index 000000000000..9a09b2791e03
--- /dev/null
+++ b/arch/arm/mach-nomadik/gpio.c
@@ -0,0 +1,396 @@
+/*
+ * Generic GPIO driver for logic cells found in the Nomadik SoC
+ *
+ * Copyright (C) 2008,2009 STMicroelectronics
+ * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
+ * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
+ *
+ * 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.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/gpio.h>
+
+/*
+ * The GPIO module in the Nomadik family of Systems-on-Chip is an
+ * AMBA device, managing 32 pins and alternate functions. The logic block
+ * is currently only used in the Nomadik.
+ *
+ * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
+ */
+
+#define NMK_GPIO_PER_CHIP 32
+struct nmk_gpio_chip {
+ struct gpio_chip chip;
+ void __iomem *addr;
+ unsigned int parent_irq;
+ spinlock_t *lock;
+ /* Keep track of configured edges */
+ u32 edge_rising;
+ u32 edge_falling;
+};
+
+/* Mode functions */
+int nmk_gpio_set_mode(int gpio, int gpio_mode)
+{
+ struct nmk_gpio_chip *nmk_chip;
+ unsigned long flags;
+ u32 afunc, bfunc, bit;
+
+ nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+ if (!nmk_chip)
+ return -EINVAL;
+
+ bit = 1 << (gpio - nmk_chip->chip.base);
+
+ spin_lock_irqsave(&nmk_chip->lock, flags);
+ afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
+ bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
+ if (gpio_mode & NMK_GPIO_ALT_A)
+ afunc |= bit;
+ if (gpio_mode & NMK_GPIO_ALT_B)
+ bfunc |= bit;
+ writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
+ writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
+ spin_unlock_irqrestore(&nmk_chip->lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(nmk_gpio_set_mode);
+
+int nmk_gpio_get_mode(int gpio)
+{
+ struct nmk_gpio_chip *nmk_chip;
+ u32 afunc, bfunc, bit;
+
+ nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+ if (!nmk_chip)
+ return -EINVAL;
+
+ bit = 1 << (gpio - nmk_chip->chip.base);
+
+ afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
+ bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
+
+ return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
+}
+EXPORT_SYMBOL(nmk_gpio_get_mode);
+
+
+/* IRQ functions */
+static inline int nmk_gpio_get_bitmask(int gpio)
+{
+ return 1 << (gpio % 32);
+}
+
+static void nmk_gpio_irq_ack(unsigned int irq)
+{
+ int gpio;
+ struct nmk_gpio_chip *nmk_chip;
+
+ gpio = NOMADIK_IRQ_TO_GPIO(irq);
+ nmk_chip = get_irq_chip_data(irq);
+ if (!nmk_chip)
+ return;
+ writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
+}
+
+static void nmk_gpio_irq_mask(unsigned int irq)
+{
+ int gpio;
+ struct nmk_gpio_chip *nmk_chip;
+ unsigned long flags;
+ u32 bitmask, reg;
+
+ gpio = NOMADIK_IRQ_TO_GPIO(irq);
+ nmk_chip = get_irq_chip_data(irq);
+ bitmask = nmk_gpio_get_bitmask(gpio);
+ if (!nmk_chip)
+ return;
+
+ /* we must individually clear the two edges */
+ spin_lock_irqsave(&nmk_chip->lock, flags);
+ if (nmk_chip->edge_rising & bitmask) {
+ reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
+ reg &= ~bitmask;
+ writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
+ }
+ if (nmk_chip->edge_falling & bitmask) {
+ reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
+ reg &= ~bitmask;
+ writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
+ }
+ spin_unlock_irqrestore(&nmk_chip->lock, flags);
+};
+
+static void nmk_gpio_irq_unmask(unsigned int irq)
+{
+ int gpio;
+ struct nmk_gpio_chip *nmk_chip;
+ unsigned long flags;
+ u32 bitmask, reg;
+
+ gpio = NOMADIK_IRQ_TO_GPIO(irq);
+ nmk_chip = get_irq_chip_data(irq);
+ bitmask = nmk_gpio_get_bitmask(gpio);
+ if (!nmk_chip)
+ return;
+
+ /* we must individually set the two edges */
+ spin_lock_irqsave(&nmk_chip->lock, flags);
+ if (nmk_chip->edge_rising & bitmask) {
+ reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
+ reg |= bitmask;
+ writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
+ }
+ if (nmk_chip->edge_falling & bitmask) {
+ reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
+ reg |= bitmask;
+ writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
+ }
+ spin_unlock_irqrestore(&nmk_chip->lock, flags);
+}
+
+static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
+{
+ int gpio;
+ struct nmk_gpio_chip *nmk_chip;
+ unsigned long flags;
+ u32 bitmask;
+
+ gpio = NOMADIK_IRQ_TO_GPIO(irq);
+ nmk_chip = get_irq_chip_data(irq);
+ bitmask = nmk_gpio_get_bitmask(gpio);
+ if (!nmk_chip)
+ return -EINVAL;
+
+ if (type & IRQ_TYPE_LEVEL_HIGH)
+ return -EINVAL;
+ if (type & IRQ_TYPE_LEVEL_LOW)
+ return -EINVAL;
+
+ spin_lock_irqsave(&nmk_chip->lock, flags);
+
+ nmk_chip->edge_rising &= ~bitmask;
+ if (type & IRQ_TYPE_EDGE_RISING)
+ nmk_chip->edge_rising |= bitmask;
+ writel(nmk_chip->edge_rising, nmk_chip->addr + NMK_GPIO_RIMSC);
+
+ nmk_chip->edge_falling &= ~bitmask;
+ if (type & IRQ_TYPE_EDGE_FALLING)
+ nmk_chip->edge_falling |= bitmask;
+ writel(nmk_chip->edge_falling, nmk_chip->addr + NMK_GPIO_FIMSC);
+
+ spin_unlock_irqrestore(&nmk_chip->lock, flags);
+
+ nmk_gpio_irq_unmask(irq);
+
+ return 0;
+}
+
+static struct irq_chip nmk_gpio_irq_chip = {
+ .name = "Nomadik-GPIO",
+ .ack = nmk_gpio_irq_ack,
+ .mask = nmk_gpio_irq_mask,
+ .unmask = nmk_gpio_irq_unmask,
+ .set_type = nmk_gpio_irq_set_type,
+};
+
+static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ struct nmk_gpio_chip *nmk_chip;
+ struct irq_chip *host_chip;
+ unsigned int gpio_irq;
+ u32 pending;
+ unsigned int first_irq;
+
+ nmk_chip = get_irq_data(irq);
+ first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
+ while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
+ gpio_irq = first_irq + __ffs(pending);
+ generic_handle_irq(gpio_irq);
+ }
+ if (0) {/* don't ack parent irq, as ack == disable */
+ host_chip = get_irq_chip(irq);
+ host_chip->ack(irq);
+ }
+}
+
+static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
+{
+ unsigned int first_irq;
+ int i;
+
+ first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
+ for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
+ set_irq_chip(i, &nmk_gpio_irq_chip);
+ set_irq_handler(i, handle_edge_irq);
+ set_irq_flags(i, IRQF_VALID);
+ set_irq_chip_data(i, nmk_chip);
+ }
+ set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
+ set_irq_data(nmk_chip->parent_irq, nmk_chip);
+ return 0;
+}
+
+/* I/O Functions */
+static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct nmk_gpio_chip *nmk_chip =
+ container_of(chip, struct nmk_gpio_chip, chip);
+
+ writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
+ return 0;
+}
+
+static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
+ int val)
+{
+ struct nmk_gpio_chip *nmk_chip =
+ container_of(chip, struct nmk_gpio_chip, chip);
+
+ writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
+ return 0;
+}
+
+static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct nmk_gpio_chip *nmk_chip =
+ container_of(chip, struct nmk_gpio_chip, chip);
+ u32 bit = 1 << offset;
+
+ return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
+}
+
+static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
+ int val)
+{
+ struct nmk_gpio_chip *nmk_chip =
+ container_of(chip, struct nmk_gpio_chip, chip);
+ u32 bit = 1 << offset;
+
+ if (val)
+ writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
+ else
+ writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
+}
+
+/* This structure is replicated for each GPIO block allocated at probe time */
+static struct gpio_chip nmk_gpio_template = {
+ .direction_input = nmk_gpio_make_input,
+ .get = nmk_gpio_get_input,
+ .direction_output = nmk_gpio_make_output,
+ .set = nmk_gpio_set_output,
+ .ngpio = NMK_GPIO_PER_CHIP,
+ .can_sleep = 0,
+};
+
+static int __init nmk_gpio_probe(struct amba_device *dev, struct amba_id *id)
+{
+ struct nmk_gpio_platform_data *pdata;
+ struct nmk_gpio_chip *nmk_chip;
+ struct gpio_chip *chip;
+ int ret;
+
+ pdata = dev->dev.platform_data;
+ ret = amba_request_regions(dev, pdata->name);
+ if (ret)
+ return ret;
+
+ nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
+ if (!nmk_chip) {
+ ret = -ENOMEM;
+ goto out_amba;
+ }
+ /*
+ * The virt address in nmk_chip->addr is in the nomadik register space,
+ * so we can simply convert the resource address, without remapping
+ */
+ nmk_chip->addr = io_p2v(dev->res.start);
+ nmk_chip->chip = nmk_gpio_template;
+ nmk_chip->parent_irq = pdata->parent_irq;
+
+ chip = &nmk_chip->chip;
+ chip->base = pdata->first_gpio;
+ chip->label = pdata->name;
+ chip->dev = &dev->dev;
+ chip->owner = THIS_MODULE;
+
+ ret = gpiochip_add(&nmk_chip->chip);
+ if (ret)
+ goto out_free;
+
+ amba_set_drvdata(dev, nmk_chip);
+
+ nmk_gpio_init_irq(nmk_chip);
+
+ dev_info(&dev->dev, "Bits %i-%i at address %p\n",
+ nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
+ return 0;
+
+ out_free:
+ kfree(nmk_chip);
+ out_amba:
+ amba_release_regions(dev);
+ dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
+ pdata->first_gpio, pdata->first_gpio+31);
+ return ret;
+}
+
+static int nmk_gpio_remove(struct amba_device *dev)
+{
+ struct nmk_gpio_chip *nmk_chip;
+
+ nmk_chip = amba_get_drvdata(dev);
+ gpiochip_remove(&nmk_chip->chip);
+ kfree(nmk_chip);
+ amba_release_regions(dev);
+ return 0;
+}
+
+
+/* We have 0x1f080060 and 0x1f180060, accept both using the mask */
+static struct amba_id nmk_gpio_ids[] = {
+ {
+ .id = 0x1f080060,
+ .mask = 0xffefffff,
+ },
+ {0, 0},
+};
+
+static struct amba_driver nmk_gpio_driver = {
+ .drv = {
+ .owner = THIS_MODULE,
+ .name = "gpio",
+ },
+ .probe = nmk_gpio_probe,
+ .remove = nmk_gpio_remove,
+ .suspend = NULL, /* to be done */
+ .resume = NULL,
+ .id_table = nmk_gpio_ids,
+};
+
+static int __init nmk_gpio_init(void)
+{
+ return amba_driver_register(&nmk_gpio_driver);
+}
+
+arch_initcall(nmk_gpio_init);
+
+MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
+MODULE_DESCRIPTION("Nomadik GPIO Driver");
+MODULE_LICENSE("GPL");
+
+
diff --git a/arch/arm/mach-nomadik/include/mach/gpio.h b/arch/arm/mach-nomadik/include/mach/gpio.h
new file mode 100644
index 000000000000..61577c9f9a7d
--- /dev/null
+++ b/arch/arm/mach-nomadik/include/mach/gpio.h
@@ -0,0 +1,71 @@
+/*
+ * Structures and registers for GPIO access in the Nomadik SoC
+ *
+ * Copyright (C) 2008 STMicroelectronics
+ * Author: Prafulla WADASKAR <prafulla.wadaskar@st.com>
+ * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
+ *
+ * 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.
+ */
+#ifndef __ASM_ARCH_GPIO_H
+#define __ASM_ARCH_GPIO_H
+
+#include <asm-generic/gpio.h>
+
+/*
+ * These currently cause a function call to happen, they may be optimized
+ * if needed by adding cpu-specific defines to identify blocks
+ * (see mach-pxa/include/mach/gpio.h as an example using GPLR etc)
+ */
+#define gpio_get_value __gpio_get_value
+#define gpio_set_value __gpio_set_value
+#define gpio_cansleep __gpio_cansleep
+#define gpio_to_irq __gpio_to_irq
+
+/*
+ * "nmk_gpio" and "NMK_GPIO" stand for "Nomadik GPIO", leaving
+ * the "gpio" namespace for generic and cross-machine functions
+ */
+
+/* Register in the logic block */
+#define NMK_GPIO_DAT 0x00
+#define NMK_GPIO_DATS 0x04
+#define NMK_GPIO_DATC 0x08
+#define NMK_GPIO_PDIS 0x0c
+#define NMK_GPIO_DIR 0x10
+#define NMK_GPIO_DIRS 0x14
+#define NMK_GPIO_DIRC 0x18
+#define NMK_GPIO_SLPC 0x1c
+#define NMK_GPIO_AFSLA 0x20
+#define NMK_GPIO_AFSLB 0x24
+
+#define NMK_GPIO_RIMSC 0x40
+#define NMK_GPIO_FIMSC 0x44
+#define NMK_GPIO_IS 0x48
+#define NMK_GPIO_IC 0x4c
+#define NMK_GPIO_RWIMSC 0x50
+#define NMK_GPIO_FWIMSC 0x54
+#define NMK_GPIO_WKS 0x58
+
+/* Alternate functions: function C is set in hw by setting both A and B */
+#define NMK_GPIO_ALT_GPIO 0
+#define NMK_GPIO_ALT_A 1
+#define NMK_GPIO_ALT_B 2
+#define NMK_GPIO_ALT_C (NMK_GPIO_ALT_A | NMK_GPIO_ALT_B)
+
+extern int nmk_gpio_set_mode(int gpio, int gpio_mode);
+extern int nmk_gpio_get_mode(int gpio);
+
+/*
+ * Platform data to register a block: only the initial gpio/irq number.
+ */
+struct nmk_gpio_platform_data {
+ char *name;
+ int first_gpio;
+ int first_irq;
+ int parent_irq;
+};
+
+#endif /* __ASM_ARCH_GPIO_H */