ARM: 5972/1: nomadik-gpio: convert to platform driver
On the U8500 platform there are four GPIO blocks, each with a 4K address space, including the peripheral identification. However, each of these blocks have a varying number of banks, each of which have 32 GPIOs and an interrupt line. The current nomadik-gpio driver implementation can handle each of these sub-banks easily with one instance each, but cannot as-is be hooked up to them because it is an AMBA driver and it expects to see a peripheral with the appropriate peripheral ids but having only one bank and only one interrupt. Solve this by converting the driver to a platform driver. Acked-by: Alessandro Rubini <rubini@unipv.it> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -20,6 +20,7 @@
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/amba/bus.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <mach/hardware.h>
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@ -30,60 +31,66 @@
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#include <asm/cacheflush.h>
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#include <asm/hardware/cache-l2x0.h>
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#define __MEM_4K_RESOURCE(x) \
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.res = {.start = (x), .end = (x) + SZ_4K - 1, .flags = IORESOURCE_MEM}
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/* The 8815 has 4 GPIO blocks, let's register them immediately */
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#define GPIO_RESOURCE(block) \
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{ \
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.start = NOMADIK_GPIO##block##_BASE, \
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.end = NOMADIK_GPIO##block##_BASE + SZ_4K - 1, \
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.flags = IORESOURCE_MEM, \
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}, \
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{ \
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.start = IRQ_GPIO##block, \
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.end = IRQ_GPIO##block, \
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.flags = IORESOURCE_IRQ, \
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}
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#define GPIO_DEVICE(block) \
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{ \
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.name = "gpio", \
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.id = block, \
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.num_resources = 2, \
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.resource = &cpu8815_gpio_resources[block * 2], \
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.dev = { \
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.platform_data = &cpu8815_gpio[block], \
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}, \
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}
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static struct nmk_gpio_platform_data cpu8815_gpio[] = {
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{
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.name = "GPIO-0-31",
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.first_gpio = 0,
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.first_irq = NOMADIK_GPIO_TO_IRQ(0),
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.parent_irq = IRQ_GPIO0,
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}, {
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.name = "GPIO-32-63",
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.first_gpio = 32,
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.first_irq = NOMADIK_GPIO_TO_IRQ(32),
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.parent_irq = IRQ_GPIO1,
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}, {
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.name = "GPIO-64-95",
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.first_gpio = 64,
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.first_irq = NOMADIK_GPIO_TO_IRQ(64),
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.parent_irq = IRQ_GPIO2,
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}, {
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.name = "GPIO-96-127", /* 124..127 not routed to pin */
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.first_gpio = 96,
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.first_irq = NOMADIK_GPIO_TO_IRQ(96),
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.parent_irq = IRQ_GPIO3,
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}
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};
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#define __MEM_4K_RESOURCE(x) \
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.res = {.start = (x), .end = (x) + SZ_4K - 1, .flags = IORESOURCE_MEM}
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static struct resource cpu8815_gpio_resources[] = {
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GPIO_RESOURCE(0),
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GPIO_RESOURCE(1),
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GPIO_RESOURCE(2),
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GPIO_RESOURCE(3),
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};
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static struct amba_device cpu8815_amba_gpio[] = {
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{
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.dev = {
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.init_name = "gpio0",
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.platform_data = cpu8815_gpio + 0,
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},
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__MEM_4K_RESOURCE(NOMADIK_GPIO0_BASE),
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}, {
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.dev = {
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.init_name = "gpio1",
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.platform_data = cpu8815_gpio + 1,
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},
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__MEM_4K_RESOURCE(NOMADIK_GPIO1_BASE),
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}, {
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.dev = {
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.init_name = "gpio2",
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.platform_data = cpu8815_gpio + 2,
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},
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__MEM_4K_RESOURCE(NOMADIK_GPIO2_BASE),
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}, {
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.dev = {
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.init_name = "gpio3",
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.platform_data = cpu8815_gpio + 3,
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},
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__MEM_4K_RESOURCE(NOMADIK_GPIO3_BASE),
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},
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static struct platform_device cpu8815_platform_gpio[] = {
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GPIO_DEVICE(0),
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GPIO_DEVICE(1),
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GPIO_DEVICE(2),
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GPIO_DEVICE(3),
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};
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static struct amba_device cpu8815_amba_rng = {
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@ -93,11 +100,14 @@ static struct amba_device cpu8815_amba_rng = {
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__MEM_4K_RESOURCE(NOMADIK_RNG_BASE),
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};
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static struct platform_device *platform_devs[] __initdata = {
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cpu8815_platform_gpio + 0,
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cpu8815_platform_gpio + 1,
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cpu8815_platform_gpio + 2,
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cpu8815_platform_gpio + 3,
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};
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static struct amba_device *amba_devs[] __initdata = {
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cpu8815_amba_gpio + 0,
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cpu8815_amba_gpio + 1,
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cpu8815_amba_gpio + 2,
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cpu8815_amba_gpio + 3,
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&cpu8815_amba_rng
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};
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@ -105,6 +115,7 @@ static int __init cpu8815_init(void)
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{
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int i;
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platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
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for (i = 0; i < ARRAY_SIZE(amba_devs); i++)
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amba_device_register(amba_devs[i], &iomem_resource);
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return 0;
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@ -13,7 +13,7 @@
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/amba/bus.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/spinlock.h>
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@ -303,30 +303,48 @@ static struct gpio_chip nmk_gpio_template = {
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.can_sleep = 0,
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};
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static int __init nmk_gpio_probe(struct amba_device *dev, struct amba_id *id)
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static int __init nmk_gpio_probe(struct platform_device *dev)
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{
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struct nmk_gpio_platform_data *pdata;
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struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
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struct nmk_gpio_chip *nmk_chip;
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struct gpio_chip *chip;
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struct resource *res;
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int irq;
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int ret;
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pdata = dev->dev.platform_data;
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ret = amba_request_regions(dev, pdata->name);
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if (ret)
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return ret;
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if (!pdata)
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return -ENODEV;
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res) {
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ret = -ENOENT;
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goto out;
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}
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irq = platform_get_irq(dev, 0);
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if (irq < 0) {
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ret = irq;
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goto out;
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}
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if (request_mem_region(res->start, resource_size(res),
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dev_name(&dev->dev)) == NULL) {
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ret = -EBUSY;
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goto out;
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}
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nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL);
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if (!nmk_chip) {
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ret = -ENOMEM;
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goto out_amba;
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goto out_release;
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}
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/*
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* The virt address in nmk_chip->addr is in the nomadik register space,
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* so we can simply convert the resource address, without remapping
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*/
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nmk_chip->addr = io_p2v(dev->res.start);
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nmk_chip->addr = io_p2v(res->start);
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nmk_chip->chip = nmk_gpio_template;
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nmk_chip->parent_irq = pdata->parent_irq;
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nmk_chip->parent_irq = irq;
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spin_lock_init(&nmk_chip->lock);
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chip = &nmk_chip->chip;
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@ -339,7 +357,7 @@ static int __init nmk_gpio_probe(struct amba_device *dev, struct amba_id *id)
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if (ret)
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goto out_free;
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amba_set_drvdata(dev, nmk_chip);
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platform_set_drvdata(dev, nmk_chip);
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nmk_gpio_init_irq(nmk_chip);
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@ -347,51 +365,45 @@ static int __init nmk_gpio_probe(struct amba_device *dev, struct amba_id *id)
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nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr);
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return 0;
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out_free:
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out_free:
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kfree(nmk_chip);
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out_amba:
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amba_release_regions(dev);
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out_release:
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release_mem_region(res->start, resource_size(res));
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out:
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dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
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pdata->first_gpio, pdata->first_gpio+31);
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return ret;
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}
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static int nmk_gpio_remove(struct amba_device *dev)
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static int __exit nmk_gpio_remove(struct platform_device *dev)
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{
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struct nmk_gpio_chip *nmk_chip;
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struct resource *res;
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nmk_chip = amba_get_drvdata(dev);
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res = platform_get_resource(dev, IORESOURCE_MEM, 0);
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nmk_chip = platform_get_drvdata(dev);
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gpiochip_remove(&nmk_chip->chip);
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kfree(nmk_chip);
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amba_release_regions(dev);
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release_mem_region(res->start, resource_size(res));
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return 0;
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}
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/* We have 0x1f080060 and 0x1f180060, accept both using the mask */
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static struct amba_id nmk_gpio_ids[] = {
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{
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.id = 0x1f080060,
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.mask = 0xffefffff,
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},
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{0, 0},
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};
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static struct amba_driver nmk_gpio_driver = {
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.drv = {
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static struct platform_driver nmk_gpio_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "gpio",
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},
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.probe = nmk_gpio_probe,
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.remove = nmk_gpio_remove,
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.remove = __exit_p(nmk_gpio_remove),
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.suspend = NULL, /* to be done */
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.resume = NULL,
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.id_table = nmk_gpio_ids,
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};
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static int __init nmk_gpio_init(void)
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{
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return amba_driver_register(&nmk_gpio_driver);
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return platform_driver_register(&nmk_gpio_driver);
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}
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arch_initcall(nmk_gpio_init);
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@ -65,7 +65,6 @@ struct nmk_gpio_platform_data {
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char *name;
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int first_gpio;
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int first_irq;
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int parent_irq;
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};
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#endif /* __ASM_PLAT_GPIO_H */
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