diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-22 14:50:57 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-22 14:50:57 -0700 |
commit | c7c8518498e82591d7784452f5674c3aeb4d079c (patch) | |
tree | 790ff7e6b6741daf32ec686b9a302b957b07c0f4 /drivers/gpio/gpio-langwell.c | |
parent | ece236ce2fad9c27a6fd2530f899289025194bce (diff) | |
parent | 591567a5ea25852f20b7ef2953f6f72020121199 (diff) | |
download | linux-next-c7c8518498e82591d7784452f5674c3aeb4d079c.tar.gz |
Merge branch 'gpio/next' of git://git.secretlab.ca/git/linux-2.6
* 'gpio/next' of git://git.secretlab.ca/git/linux-2.6: (61 commits)
gpio/mxc/mxs: fix build error introduced by the irq_gc_ack() renaming
mcp23s08: add i2c support
mcp23s08: isolate spi specific parts
mcp23s08: get rid of setup/teardown callbacks
gpio/tegra: dt: add binding for gpio polarity
mcp23s08: remove unused work queue
gpio/da9052: remove a redundant assignment for gpio->da9052
gpio/mxc: add device tree probe support
ARM: mxc: use ARCH_NR_GPIOS to define gpio number
gpio/mxc: get rid of the uses of cpu_is_mx()
gpio/mxc: add missing initialization of basic_mmio_gpio shadow variables
gpio: Move mpc5200 gpio driver to drivers/gpio
GPIO: DA9052 GPIO module v3
gpio/tegra: Use engineering names in DT compatible property
of/gpio: Add new method for getting gpios under different property names
gpio/dt: Refine GPIO device tree binding
gpio/ml-ioh: fix off-by-one for displaying variable i in dev_err
gpio/pca953x: Deprecate meaningless device-tree bindings
gpio/pca953x: Remove dynamic platform data pointer
gpio/pca953x: Fix IRQ support.
...
Diffstat (limited to 'drivers/gpio/gpio-langwell.c')
-rw-r--r-- | drivers/gpio/gpio-langwell.c | 458 |
1 files changed, 458 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-langwell.c b/drivers/gpio/gpio-langwell.c new file mode 100644 index 000000000000..d2eb57c60e0e --- /dev/null +++ b/drivers/gpio/gpio-langwell.c @@ -0,0 +1,458 @@ +/* + * Moorestown platform Langwell chip GPIO driver + * + * Copyright (c) 2008 - 2009, Intel Corporation. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* Supports: + * Moorestown platform Langwell chip. + * Medfield platform Penwell chip. + * Whitney point. + */ + +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/stddef.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/gpio.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> + +/* + * Langwell chip has 64 pins and thus there are 2 32bit registers to control + * each feature, while Penwell chip has 96 pins for each block, and need 3 32bit + * registers to control them, so we only define the order here instead of a + * structure, to get a bit offset for a pin (use GPDR as an example): + * + * nreg = ngpio / 32; + * reg = offset / 32; + * bit = offset % 32; + * reg_addr = reg_base + GPDR * nreg * 4 + reg * 4; + * + * so the bit of reg_addr is to control pin offset's GPDR feature +*/ + +enum GPIO_REG { + GPLR = 0, /* pin level read-only */ + GPDR, /* pin direction */ + GPSR, /* pin set */ + GPCR, /* pin clear */ + GRER, /* rising edge detect */ + GFER, /* falling edge detect */ + GEDR, /* edge detect result */ +}; + +struct lnw_gpio { + struct gpio_chip chip; + void *reg_base; + spinlock_t lock; + unsigned irq_base; + struct pci_dev *pdev; +}; + +static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset, + enum GPIO_REG reg_type) +{ + struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); + unsigned nreg = chip->ngpio / 32; + u8 reg = offset / 32; + void __iomem *ptr; + + ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg * 4); + return ptr; +} + +static int lnw_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + void __iomem *gplr = gpio_reg(chip, offset, GPLR); + + return readl(gplr) & BIT(offset % 32); +} + +static void lnw_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + void __iomem *gpsr, *gpcr; + + if (value) { + gpsr = gpio_reg(chip, offset, GPSR); + writel(BIT(offset % 32), gpsr); + } else { + gpcr = gpio_reg(chip, offset, GPCR); + writel(BIT(offset % 32), gpcr); + } +} + +static int lnw_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); + void __iomem *gpdr = gpio_reg(chip, offset, GPDR); + u32 value; + unsigned long flags; + + if (lnw->pdev) + pm_runtime_get(&lnw->pdev->dev); + + spin_lock_irqsave(&lnw->lock, flags); + value = readl(gpdr); + value &= ~BIT(offset % 32); + writel(value, gpdr); + spin_unlock_irqrestore(&lnw->lock, flags); + + if (lnw->pdev) + pm_runtime_put(&lnw->pdev->dev); + + return 0; +} + +static int lnw_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); + void __iomem *gpdr = gpio_reg(chip, offset, GPDR); + unsigned long flags; + + lnw_gpio_set(chip, offset, value); + + if (lnw->pdev) + pm_runtime_get(&lnw->pdev->dev); + + spin_lock_irqsave(&lnw->lock, flags); + value = readl(gpdr); + value |= BIT(offset % 32); + writel(value, gpdr); + spin_unlock_irqrestore(&lnw->lock, flags); + + if (lnw->pdev) + pm_runtime_put(&lnw->pdev->dev); + + return 0; +} + +static int lnw_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip); + return lnw->irq_base + offset; +} + +static int lnw_irq_type(struct irq_data *d, unsigned type) +{ + struct lnw_gpio *lnw = irq_data_get_irq_chip_data(d); + u32 gpio = d->irq - lnw->irq_base; + unsigned long flags; + u32 value; + void __iomem *grer = gpio_reg(&lnw->chip, gpio, GRER); + void __iomem *gfer = gpio_reg(&lnw->chip, gpio, GFER); + + if (gpio >= lnw->chip.ngpio) + return -EINVAL; + + if (lnw->pdev) + pm_runtime_get(&lnw->pdev->dev); + + spin_lock_irqsave(&lnw->lock, flags); + if (type & IRQ_TYPE_EDGE_RISING) + value = readl(grer) | BIT(gpio % 32); + else + value = readl(grer) & (~BIT(gpio % 32)); + writel(value, grer); + + if (type & IRQ_TYPE_EDGE_FALLING) + value = readl(gfer) | BIT(gpio % 32); + else + value = readl(gfer) & (~BIT(gpio % 32)); + writel(value, gfer); + spin_unlock_irqrestore(&lnw->lock, flags); + + if (lnw->pdev) + pm_runtime_put(&lnw->pdev->dev); + + return 0; +} + +static void lnw_irq_unmask(struct irq_data *d) +{ +} + +static void lnw_irq_mask(struct irq_data *d) +{ +} + +static struct irq_chip lnw_irqchip = { + .name = "LNW-GPIO", + .irq_mask = lnw_irq_mask, + .irq_unmask = lnw_irq_unmask, + .irq_set_type = lnw_irq_type, +}; + +static DEFINE_PCI_DEVICE_TABLE(lnw_gpio_ids) = { /* pin number */ + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f), .driver_data = 64 }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f), .driver_data = 96 }, + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a), .driver_data = 96 }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, lnw_gpio_ids); + +static void lnw_irq_handler(unsigned irq, struct irq_desc *desc) +{ + struct irq_data *data = irq_desc_get_irq_data(desc); + struct lnw_gpio *lnw = irq_data_get_irq_handler_data(data); + struct irq_chip *chip = irq_data_get_irq_chip(data); + u32 base, gpio, mask; + unsigned long pending; + void __iomem *gedr; + + /* check GPIO controller to check which pin triggered the interrupt */ + for (base = 0; base < lnw->chip.ngpio; base += 32) { + gedr = gpio_reg(&lnw->chip, base, GEDR); + pending = readl(gedr); + while (pending) { + gpio = __ffs(pending); + mask = BIT(gpio); + pending &= ~mask; + /* Clear before handling so we can't lose an edge */ + writel(mask, gedr); + generic_handle_irq(lnw->irq_base + base + gpio); + } + } + + chip->irq_eoi(data); +} + +#ifdef CONFIG_PM +static int lnw_gpio_runtime_resume(struct device *dev) +{ + return 0; +} + +static int lnw_gpio_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int lnw_gpio_runtime_idle(struct device *dev) +{ + int err = pm_schedule_suspend(dev, 500); + + if (!err) + return 0; + + return -EBUSY; +} + +#else +#define lnw_gpio_runtime_suspend NULL +#define lnw_gpio_runtime_resume NULL +#define lnw_gpio_runtime_idle NULL +#endif + +static const struct dev_pm_ops lnw_gpio_pm_ops = { + .runtime_suspend = lnw_gpio_runtime_suspend, + .runtime_resume = lnw_gpio_runtime_resume, + .runtime_idle = lnw_gpio_runtime_idle, +}; + +static int __devinit lnw_gpio_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + void *base; + int i; + resource_size_t start, len; + struct lnw_gpio *lnw; + u32 irq_base; + u32 gpio_base; + int retval = 0; + + retval = pci_enable_device(pdev); + if (retval) + goto done; + + retval = pci_request_regions(pdev, "langwell_gpio"); + if (retval) { + dev_err(&pdev->dev, "error requesting resources\n"); + goto err2; + } + /* get the irq_base from bar1 */ + start = pci_resource_start(pdev, 1); + len = pci_resource_len(pdev, 1); + base = ioremap_nocache(start, len); + if (!base) { + dev_err(&pdev->dev, "error mapping bar1\n"); + goto err3; + } + irq_base = *(u32 *)base; + gpio_base = *((u32 *)base + 1); + /* release the IO mapping, since we already get the info from bar1 */ + iounmap(base); + /* get the register base from bar0 */ + start = pci_resource_start(pdev, 0); + len = pci_resource_len(pdev, 0); + base = ioremap_nocache(start, len); + if (!base) { + dev_err(&pdev->dev, "error mapping bar0\n"); + retval = -EFAULT; + goto err3; + } + + lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL); + if (!lnw) { + dev_err(&pdev->dev, "can't allocate langwell_gpio chip data\n"); + retval = -ENOMEM; + goto err4; + } + lnw->reg_base = base; + lnw->irq_base = irq_base; + lnw->chip.label = dev_name(&pdev->dev); + lnw->chip.direction_input = lnw_gpio_direction_input; + lnw->chip.direction_output = lnw_gpio_direction_output; + lnw->chip.get = lnw_gpio_get; + lnw->chip.set = lnw_gpio_set; + lnw->chip.to_irq = lnw_gpio_to_irq; + lnw->chip.base = gpio_base; + lnw->chip.ngpio = id->driver_data; + lnw->chip.can_sleep = 0; + lnw->pdev = pdev; + pci_set_drvdata(pdev, lnw); + retval = gpiochip_add(&lnw->chip); + if (retval) { + dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval); + goto err5; + } + irq_set_handler_data(pdev->irq, lnw); + irq_set_chained_handler(pdev->irq, lnw_irq_handler); + for (i = 0; i < lnw->chip.ngpio; i++) { + irq_set_chip_and_handler_name(i + lnw->irq_base, &lnw_irqchip, + handle_simple_irq, "demux"); + irq_set_chip_data(i + lnw->irq_base, lnw); + } + + spin_lock_init(&lnw->lock); + + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_allow(&pdev->dev); + + goto done; +err5: + kfree(lnw); +err4: + iounmap(base); +err3: + pci_release_regions(pdev); +err2: + pci_disable_device(pdev); +done: + return retval; +} + +static struct pci_driver lnw_gpio_driver = { + .name = "langwell_gpio", + .id_table = lnw_gpio_ids, + .probe = lnw_gpio_probe, + .driver = { + .pm = &lnw_gpio_pm_ops, + }, +}; + + +static int __devinit wp_gpio_probe(struct platform_device *pdev) +{ + struct lnw_gpio *lnw; + struct gpio_chip *gc; + struct resource *rc; + int retval = 0; + + rc = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!rc) + return -EINVAL; + + lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL); + if (!lnw) { + dev_err(&pdev->dev, + "can't allocate whitneypoint_gpio chip data\n"); + return -ENOMEM; + } + lnw->reg_base = ioremap_nocache(rc->start, resource_size(rc)); + if (lnw->reg_base == NULL) { + retval = -EINVAL; + goto err_kmalloc; + } + spin_lock_init(&lnw->lock); + gc = &lnw->chip; + gc->label = dev_name(&pdev->dev); + gc->owner = THIS_MODULE; + gc->direction_input = lnw_gpio_direction_input; + gc->direction_output = lnw_gpio_direction_output; + gc->get = lnw_gpio_get; + gc->set = lnw_gpio_set; + gc->to_irq = NULL; + gc->base = 0; + gc->ngpio = 64; + gc->can_sleep = 0; + retval = gpiochip_add(gc); + if (retval) { + dev_err(&pdev->dev, "whitneypoint gpiochip_add error %d\n", + retval); + goto err_ioremap; + } + platform_set_drvdata(pdev, lnw); + return 0; +err_ioremap: + iounmap(lnw->reg_base); +err_kmalloc: + kfree(lnw); + return retval; +} + +static int __devexit wp_gpio_remove(struct platform_device *pdev) +{ + struct lnw_gpio *lnw = platform_get_drvdata(pdev); + int err; + err = gpiochip_remove(&lnw->chip); + if (err) + dev_err(&pdev->dev, "failed to remove gpio_chip.\n"); + iounmap(lnw->reg_base); + kfree(lnw); + platform_set_drvdata(pdev, NULL); + return 0; +} + +static struct platform_driver wp_gpio_driver = { + .probe = wp_gpio_probe, + .remove = __devexit_p(wp_gpio_remove), + .driver = { + .name = "wp_gpio", + .owner = THIS_MODULE, + }, +}; + +static int __init lnw_gpio_init(void) +{ + int ret; + ret = pci_register_driver(&lnw_gpio_driver); + if (ret < 0) + return ret; + ret = platform_driver_register(&wp_gpio_driver); + if (ret < 0) + pci_unregister_driver(&lnw_gpio_driver); + return ret; +} + +device_initcall(lnw_gpio_init); |