diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/gpio/gpio-mxs.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/gpio/gpio-mxs.c | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/ANDROID_3.4.5/drivers/gpio/gpio-mxs.c b/ANDROID_3.4.5/drivers/gpio/gpio-mxs.c deleted file mode 100644 index 385c58e8..00000000 --- a/ANDROID_3.4.5/drivers/gpio/gpio-mxs.c +++ /dev/null @@ -1,292 +0,0 @@ -/* - * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de> - * Copyright 2008 Juergen Beisert, kernel@pengutronix.de - * - * Based on code from Freescale, - * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * 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., 51 Franklin Street, Fifth Floor, Boston, - * MA 02110-1301, USA. - */ - -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/irq.h> -#include <linux/gpio.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/basic_mmio_gpio.h> -#include <linux/module.h> -#include <mach/mxs.h> - -#define MXS_SET 0x4 -#define MXS_CLR 0x8 - -#define PINCTRL_DOUT(n) ((cpu_is_mx23() ? 0x0500 : 0x0700) + (n) * 0x10) -#define PINCTRL_DIN(n) ((cpu_is_mx23() ? 0x0600 : 0x0900) + (n) * 0x10) -#define PINCTRL_DOE(n) ((cpu_is_mx23() ? 0x0700 : 0x0b00) + (n) * 0x10) -#define PINCTRL_PIN2IRQ(n) ((cpu_is_mx23() ? 0x0800 : 0x1000) + (n) * 0x10) -#define PINCTRL_IRQEN(n) ((cpu_is_mx23() ? 0x0900 : 0x1100) + (n) * 0x10) -#define PINCTRL_IRQLEV(n) ((cpu_is_mx23() ? 0x0a00 : 0x1200) + (n) * 0x10) -#define PINCTRL_IRQPOL(n) ((cpu_is_mx23() ? 0x0b00 : 0x1300) + (n) * 0x10) -#define PINCTRL_IRQSTAT(n) ((cpu_is_mx23() ? 0x0c00 : 0x1400) + (n) * 0x10) - -#define GPIO_INT_FALL_EDGE 0x0 -#define GPIO_INT_LOW_LEV 0x1 -#define GPIO_INT_RISE_EDGE 0x2 -#define GPIO_INT_HIGH_LEV 0x3 -#define GPIO_INT_LEV_MASK (1 << 0) -#define GPIO_INT_POL_MASK (1 << 1) - -#define irq_to_gpio(irq) ((irq) - MXS_GPIO_IRQ_START) - -struct mxs_gpio_port { - void __iomem *base; - int id; - int irq; - int virtual_irq_start; - struct bgpio_chip bgc; -}; - -/* Note: This driver assumes 32 GPIOs are handled in one register */ - -static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type) -{ - u32 gpio = irq_to_gpio(d->irq); - u32 pin_mask = 1 << (gpio & 31); - struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); - struct mxs_gpio_port *port = gc->private; - void __iomem *pin_addr; - int edge; - - switch (type) { - case IRQ_TYPE_EDGE_RISING: - edge = GPIO_INT_RISE_EDGE; - break; - case IRQ_TYPE_EDGE_FALLING: - edge = GPIO_INT_FALL_EDGE; - break; - case IRQ_TYPE_LEVEL_LOW: - edge = GPIO_INT_LOW_LEV; - break; - case IRQ_TYPE_LEVEL_HIGH: - edge = GPIO_INT_HIGH_LEV; - break; - default: - return -EINVAL; - } - - /* set level or edge */ - pin_addr = port->base + PINCTRL_IRQLEV(port->id); - if (edge & GPIO_INT_LEV_MASK) - writel(pin_mask, pin_addr + MXS_SET); - else - writel(pin_mask, pin_addr + MXS_CLR); - - /* set polarity */ - pin_addr = port->base + PINCTRL_IRQPOL(port->id); - if (edge & GPIO_INT_POL_MASK) - writel(pin_mask, pin_addr + MXS_SET); - else - writel(pin_mask, pin_addr + MXS_CLR); - - writel(1 << (gpio & 0x1f), - port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR); - - return 0; -} - -/* MXS has one interrupt *per* gpio port */ -static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc) -{ - u32 irq_stat; - struct mxs_gpio_port *port = irq_get_handler_data(irq); - u32 gpio_irq_no_base = port->virtual_irq_start; - - desc->irq_data.chip->irq_ack(&desc->irq_data); - - irq_stat = readl(port->base + PINCTRL_IRQSTAT(port->id)) & - readl(port->base + PINCTRL_IRQEN(port->id)); - - while (irq_stat != 0) { - int irqoffset = fls(irq_stat) - 1; - generic_handle_irq(gpio_irq_no_base + irqoffset); - irq_stat &= ~(1 << irqoffset); - } -} - -/* - * Set interrupt number "irq" in the GPIO as a wake-up source. - * While system is running, all registered GPIO interrupts need to have - * wake-up enabled. When system is suspended, only selected GPIO interrupts - * need to have wake-up enabled. - * @param irq interrupt source number - * @param enable enable as wake-up if equal to non-zero - * @return This function returns 0 on success. - */ -static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable) -{ - struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); - struct mxs_gpio_port *port = gc->private; - - if (enable) - enable_irq_wake(port->irq); - else - disable_irq_wake(port->irq); - - return 0; -} - -static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port) -{ - struct irq_chip_generic *gc; - struct irq_chip_type *ct; - - gc = irq_alloc_generic_chip("gpio-mxs", 1, port->virtual_irq_start, - port->base, handle_level_irq); - gc->private = port; - - ct = gc->chip_types; - ct->chip.irq_ack = irq_gc_ack_set_bit; - ct->chip.irq_mask = irq_gc_mask_clr_bit; - ct->chip.irq_unmask = irq_gc_mask_set_bit; - ct->chip.irq_set_type = mxs_gpio_set_irq_type; - ct->chip.irq_set_wake = mxs_gpio_set_wake_irq; - ct->regs.ack = PINCTRL_IRQSTAT(port->id) + MXS_CLR; - ct->regs.mask = PINCTRL_IRQEN(port->id); - - irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0); -} - -static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset) -{ - struct bgpio_chip *bgc = to_bgpio_chip(gc); - struct mxs_gpio_port *port = - container_of(bgc, struct mxs_gpio_port, bgc); - - return port->virtual_irq_start + offset; -} - -static int __devinit mxs_gpio_probe(struct platform_device *pdev) -{ - static void __iomem *base; - struct mxs_gpio_port *port; - struct resource *iores = NULL; - int err; - - port = kzalloc(sizeof(struct mxs_gpio_port), GFP_KERNEL); - if (!port) - return -ENOMEM; - - port->id = pdev->id; - port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32; - - /* - * map memory region only once, as all the gpio ports - * share the same one - */ - if (!base) { - iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!iores) { - err = -ENODEV; - goto out_kfree; - } - - if (!request_mem_region(iores->start, resource_size(iores), - pdev->name)) { - err = -EBUSY; - goto out_kfree; - } - - base = ioremap(iores->start, resource_size(iores)); - if (!base) { - err = -ENOMEM; - goto out_release_mem; - } - } - port->base = base; - - port->irq = platform_get_irq(pdev, 0); - if (port->irq < 0) { - err = -EINVAL; - goto out_iounmap; - } - - /* - * select the pin interrupt functionality but initially - * disable the interrupts - */ - writel(~0U, port->base + PINCTRL_PIN2IRQ(port->id)); - writel(0, port->base + PINCTRL_IRQEN(port->id)); - - /* clear address has to be used to clear IRQSTAT bits */ - writel(~0U, port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR); - - /* gpio-mxs can be a generic irq chip */ - mxs_gpio_init_gc(port); - - /* setup one handler for each entry */ - irq_set_chained_handler(port->irq, mxs_gpio_irq_handler); - irq_set_handler_data(port->irq, port); - - err = bgpio_init(&port->bgc, &pdev->dev, 4, - port->base + PINCTRL_DIN(port->id), - port->base + PINCTRL_DOUT(port->id), NULL, - port->base + PINCTRL_DOE(port->id), NULL, false); - if (err) - goto out_iounmap; - - port->bgc.gc.to_irq = mxs_gpio_to_irq; - port->bgc.gc.base = port->id * 32; - - err = gpiochip_add(&port->bgc.gc); - if (err) - goto out_bgpio_remove; - - return 0; - -out_bgpio_remove: - bgpio_remove(&port->bgc); -out_iounmap: - if (iores) - iounmap(port->base); -out_release_mem: - if (iores) - release_mem_region(iores->start, resource_size(iores)); -out_kfree: - kfree(port); - dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err); - return err; -} - -static struct platform_driver mxs_gpio_driver = { - .driver = { - .name = "gpio-mxs", - .owner = THIS_MODULE, - }, - .probe = mxs_gpio_probe, -}; - -static int __init mxs_gpio_init(void) -{ - return platform_driver_register(&mxs_gpio_driver); -} -postcore_initcall(mxs_gpio_init); - -MODULE_AUTHOR("Freescale Semiconductor, " - "Daniel Mack <danielncaiaq.de>, " - "Juergen Beisert <kernel@pengutronix.de>"); -MODULE_DESCRIPTION("Freescale MXS GPIO"); -MODULE_LICENSE("GPL"); |