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84bead6c38
I don't have the specs for this beast, but it looks a lot like the PXA GPIO block. Though I bet it's the same IP and the driver should have reused the PXA code. Acknowleding the edge detect status after handling one or more gpio interrupts looks wrong. We might lose an edge which came in while we handled the previous one. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Alek Du <alek.du@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
392 lines
9.9 KiB
C
392 lines
9.9 KiB
C
/* langwell_gpio.c Moorestown platform Langwell chip GPIO driver
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* Copyright (c) 2008 - 2009, Intel Corporation.
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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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* 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* Supports:
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* Moorestown platform Langwell chip.
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* Medfield platform Penwell chip.
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* Whitney point.
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/stddef.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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/*
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* Langwell chip has 64 pins and thus there are 2 32bit registers to control
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* each feature, while Penwell chip has 96 pins for each block, and need 3 32bit
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* registers to control them, so we only define the order here instead of a
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* structure, to get a bit offset for a pin (use GPDR as an example):
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*
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* nreg = ngpio / 32;
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* reg = offset / 32;
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* bit = offset % 32;
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* reg_addr = reg_base + GPDR * nreg * 4 + reg * 4;
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*
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* so the bit of reg_addr is to control pin offset's GPDR feature
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*/
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enum GPIO_REG {
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GPLR = 0, /* pin level read-only */
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GPDR, /* pin direction */
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GPSR, /* pin set */
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GPCR, /* pin clear */
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GRER, /* rising edge detect */
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GFER, /* falling edge detect */
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GEDR, /* edge detect result */
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};
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struct lnw_gpio {
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struct gpio_chip chip;
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void *reg_base;
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spinlock_t lock;
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unsigned irq_base;
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};
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static void __iomem *gpio_reg(struct gpio_chip *chip, unsigned offset,
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enum GPIO_REG reg_type)
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{
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struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
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unsigned nreg = chip->ngpio / 32;
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u8 reg = offset / 32;
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void __iomem *ptr;
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ptr = (void __iomem *)(lnw->reg_base + reg_type * nreg * 4 + reg * 4);
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return ptr;
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}
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static int lnw_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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void __iomem *gplr = gpio_reg(chip, offset, GPLR);
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return readl(gplr) & BIT(offset % 32);
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}
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static void lnw_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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void __iomem *gpsr, *gpcr;
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if (value) {
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gpsr = gpio_reg(chip, offset, GPSR);
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writel(BIT(offset % 32), gpsr);
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} else {
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gpcr = gpio_reg(chip, offset, GPCR);
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writel(BIT(offset % 32), gpcr);
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}
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}
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static int lnw_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
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void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
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u32 value;
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unsigned long flags;
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spin_lock_irqsave(&lnw->lock, flags);
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value = readl(gpdr);
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value &= ~BIT(offset % 32);
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writel(value, gpdr);
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spin_unlock_irqrestore(&lnw->lock, flags);
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return 0;
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}
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static int lnw_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
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void __iomem *gpdr = gpio_reg(chip, offset, GPDR);
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unsigned long flags;
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lnw_gpio_set(chip, offset, value);
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spin_lock_irqsave(&lnw->lock, flags);
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value = readl(gpdr);
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value |= BIT(offset % 32);;
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writel(value, gpdr);
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spin_unlock_irqrestore(&lnw->lock, flags);
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return 0;
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}
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static int lnw_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct lnw_gpio *lnw = container_of(chip, struct lnw_gpio, chip);
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return lnw->irq_base + offset;
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}
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static int lnw_irq_type(struct irq_data *d, unsigned type)
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{
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struct lnw_gpio *lnw = irq_data_get_irq_chip_data(d);
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u32 gpio = d->irq - lnw->irq_base;
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unsigned long flags;
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u32 value;
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void __iomem *grer = gpio_reg(&lnw->chip, gpio, GRER);
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void __iomem *gfer = gpio_reg(&lnw->chip, gpio, GFER);
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if (gpio >= lnw->chip.ngpio)
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return -EINVAL;
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spin_lock_irqsave(&lnw->lock, flags);
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if (type & IRQ_TYPE_EDGE_RISING)
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value = readl(grer) | BIT(gpio % 32);
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else
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value = readl(grer) & (~BIT(gpio % 32));
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writel(value, grer);
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if (type & IRQ_TYPE_EDGE_FALLING)
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value = readl(gfer) | BIT(gpio % 32);
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else
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value = readl(gfer) & (~BIT(gpio % 32));
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writel(value, gfer);
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spin_unlock_irqrestore(&lnw->lock, flags);
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return 0;
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}
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static void lnw_irq_unmask(struct irq_data *d)
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{
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}
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static void lnw_irq_mask(struct irq_data *d)
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{
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}
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static struct irq_chip lnw_irqchip = {
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.name = "LNW-GPIO",
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.irq_mask = lnw_irq_mask,
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.irq_unmask = lnw_irq_unmask,
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.irq_set_type = lnw_irq_type,
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};
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static DEFINE_PCI_DEVICE_TABLE(lnw_gpio_ids) = { /* pin number */
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x080f), .driver_data = 64 },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081f), .driver_data = 96 },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081a), .driver_data = 96 },
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{ 0, }
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};
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MODULE_DEVICE_TABLE(pci, lnw_gpio_ids);
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static void lnw_irq_handler(unsigned irq, struct irq_desc *desc)
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{
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struct irq_data *data = irq_desc_get_irq_data(desc);
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struct lnw_gpio *lnw = irq_data_get_irq_handler_data(data);
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struct irq_chip *chip = irq_data_get_irq_chip(data);
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u32 base, gpio, mask;
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unsigned long pending;
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void __iomem *gedr;
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/* check GPIO controller to check which pin triggered the interrupt */
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for (base = 0; base < lnw->chip.ngpio; base += 32) {
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gedr = gpio_reg(&lnw->chip, base, GEDR);
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pending = readl(gedr);
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while (pending) {
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gpio = __ffs(pending) - 1;
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mask = BIT(gpio);
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pending &= ~mask;
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/* Clear before handling so we can't lose an edge */
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writel(mask, gedr);
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generic_handle_irq(lnw->irq_base + base + gpio);
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}
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}
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chip->irq_eoi(data);
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}
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static int __devinit lnw_gpio_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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void *base;
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int i;
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resource_size_t start, len;
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struct lnw_gpio *lnw;
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u32 irq_base;
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u32 gpio_base;
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int retval = 0;
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retval = pci_enable_device(pdev);
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if (retval)
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goto done;
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retval = pci_request_regions(pdev, "langwell_gpio");
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if (retval) {
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dev_err(&pdev->dev, "error requesting resources\n");
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goto err2;
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}
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/* get the irq_base from bar1 */
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start = pci_resource_start(pdev, 1);
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len = pci_resource_len(pdev, 1);
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base = ioremap_nocache(start, len);
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if (!base) {
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dev_err(&pdev->dev, "error mapping bar1\n");
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goto err3;
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}
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irq_base = *(u32 *)base;
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gpio_base = *((u32 *)base + 1);
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/* release the IO mapping, since we already get the info from bar1 */
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iounmap(base);
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/* get the register base from bar0 */
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start = pci_resource_start(pdev, 0);
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len = pci_resource_len(pdev, 0);
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base = ioremap_nocache(start, len);
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if (!base) {
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dev_err(&pdev->dev, "error mapping bar0\n");
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retval = -EFAULT;
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goto err3;
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}
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lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
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if (!lnw) {
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dev_err(&pdev->dev, "can't allocate langwell_gpio chip data\n");
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retval = -ENOMEM;
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goto err4;
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}
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lnw->reg_base = base;
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lnw->irq_base = irq_base;
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lnw->chip.label = dev_name(&pdev->dev);
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lnw->chip.direction_input = lnw_gpio_direction_input;
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lnw->chip.direction_output = lnw_gpio_direction_output;
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lnw->chip.get = lnw_gpio_get;
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lnw->chip.set = lnw_gpio_set;
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lnw->chip.to_irq = lnw_gpio_to_irq;
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lnw->chip.base = gpio_base;
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lnw->chip.ngpio = id->driver_data;
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lnw->chip.can_sleep = 0;
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pci_set_drvdata(pdev, lnw);
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retval = gpiochip_add(&lnw->chip);
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if (retval) {
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dev_err(&pdev->dev, "langwell gpiochip_add error %d\n", retval);
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goto err5;
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}
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irq_set_handler_data(pdev->irq, lnw);
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irq_set_chained_handler(pdev->irq, lnw_irq_handler);
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for (i = 0; i < lnw->chip.ngpio; i++) {
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irq_set_chip_and_handler_name(i + lnw->irq_base, &lnw_irqchip,
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handle_simple_irq, "demux");
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irq_set_chip_data(i + lnw->irq_base, lnw);
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}
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spin_lock_init(&lnw->lock);
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goto done;
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err5:
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kfree(lnw);
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err4:
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iounmap(base);
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err3:
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pci_release_regions(pdev);
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err2:
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pci_disable_device(pdev);
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done:
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return retval;
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}
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static struct pci_driver lnw_gpio_driver = {
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.name = "langwell_gpio",
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.id_table = lnw_gpio_ids,
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.probe = lnw_gpio_probe,
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};
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static int __devinit wp_gpio_probe(struct platform_device *pdev)
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{
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struct lnw_gpio *lnw;
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struct gpio_chip *gc;
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struct resource *rc;
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int retval = 0;
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rc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!rc)
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return -EINVAL;
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lnw = kzalloc(sizeof(struct lnw_gpio), GFP_KERNEL);
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if (!lnw) {
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dev_err(&pdev->dev,
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"can't allocate whitneypoint_gpio chip data\n");
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return -ENOMEM;
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}
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lnw->reg_base = ioremap_nocache(rc->start, resource_size(rc));
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if (lnw->reg_base == NULL) {
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retval = -EINVAL;
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goto err_kmalloc;
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}
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spin_lock_init(&lnw->lock);
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gc = &lnw->chip;
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gc->label = dev_name(&pdev->dev);
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gc->owner = THIS_MODULE;
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gc->direction_input = lnw_gpio_direction_input;
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gc->direction_output = lnw_gpio_direction_output;
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gc->get = lnw_gpio_get;
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gc->set = lnw_gpio_set;
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gc->to_irq = NULL;
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gc->base = 0;
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gc->ngpio = 64;
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gc->can_sleep = 0;
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retval = gpiochip_add(gc);
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if (retval) {
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dev_err(&pdev->dev, "whitneypoint gpiochip_add error %d\n",
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retval);
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goto err_ioremap;
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}
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platform_set_drvdata(pdev, lnw);
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return 0;
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err_ioremap:
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iounmap(lnw->reg_base);
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err_kmalloc:
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kfree(lnw);
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return retval;
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}
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static int __devexit wp_gpio_remove(struct platform_device *pdev)
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{
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struct lnw_gpio *lnw = platform_get_drvdata(pdev);
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int err;
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err = gpiochip_remove(&lnw->chip);
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if (err)
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dev_err(&pdev->dev, "failed to remove gpio_chip.\n");
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iounmap(lnw->reg_base);
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kfree(lnw);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver wp_gpio_driver = {
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.probe = wp_gpio_probe,
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.remove = __devexit_p(wp_gpio_remove),
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.driver = {
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.name = "wp_gpio",
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.owner = THIS_MODULE,
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},
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};
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static int __init lnw_gpio_init(void)
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{
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int ret;
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ret = pci_register_driver(&lnw_gpio_driver);
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if (ret < 0)
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return ret;
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ret = platform_driver_register(&wp_gpio_driver);
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if (ret < 0)
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pci_unregister_driver(&lnw_gpio_driver);
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return ret;
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}
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device_initcall(lnw_gpio_init);
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