diff options
Diffstat (limited to 'arch/arm/plat-mxc/gpio.c')
| -rw-r--r-- | arch/arm/plat-mxc/gpio.c | 361 |
1 files changed, 0 insertions, 361 deletions
diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c deleted file mode 100644 index 6cd6d7f686f6..000000000000 --- a/arch/arm/plat-mxc/gpio.c +++ /dev/null @@ -1,361 +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 <mach/hardware.h> -#include <asm-generic/bug.h> - -static struct mxc_gpio_port *mxc_gpio_ports; -static int gpio_table_size; - -#define cpu_is_mx1_mx2() (cpu_is_mx1() || cpu_is_mx2()) - -#define GPIO_DR (cpu_is_mx1_mx2() ? 0x1c : 0x00) -#define GPIO_GDIR (cpu_is_mx1_mx2() ? 0x00 : 0x04) -#define GPIO_PSR (cpu_is_mx1_mx2() ? 0x24 : 0x08) -#define GPIO_ICR1 (cpu_is_mx1_mx2() ? 0x28 : 0x0C) -#define GPIO_ICR2 (cpu_is_mx1_mx2() ? 0x2C : 0x10) -#define GPIO_IMR (cpu_is_mx1_mx2() ? 0x30 : 0x14) -#define GPIO_ISR (cpu_is_mx1_mx2() ? 0x34 : 0x18) - -#define GPIO_INT_LOW_LEV (cpu_is_mx1_mx2() ? 0x3 : 0x0) -#define GPIO_INT_HIGH_LEV (cpu_is_mx1_mx2() ? 0x2 : 0x1) -#define GPIO_INT_RISE_EDGE (cpu_is_mx1_mx2() ? 0x0 : 0x2) -#define GPIO_INT_FALL_EDGE (cpu_is_mx1_mx2() ? 0x1 : 0x3) -#define GPIO_INT_NONE 0x4 - -/* Note: This driver assumes 32 GPIOs are handled in one register */ - -static void _clear_gpio_irqstatus(struct mxc_gpio_port *port, u32 index) -{ - __raw_writel(1 << index, port->base + GPIO_ISR); -} - -static void _set_gpio_irqenable(struct mxc_gpio_port *port, u32 index, - int enable) -{ - u32 l; - - l = __raw_readl(port->base + GPIO_IMR); - l = (l & (~(1 << index))) | (!!enable << index); - __raw_writel(l, port->base + GPIO_IMR); -} - -static void gpio_ack_irq(struct irq_data *d) -{ - u32 gpio = irq_to_gpio(d->irq); - _clear_gpio_irqstatus(&mxc_gpio_ports[gpio / 32], gpio & 0x1f); -} - -static void gpio_mask_irq(struct irq_data *d) -{ - u32 gpio = irq_to_gpio(d->irq); - _set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 0); -} - -static void gpio_unmask_irq(struct irq_data *d) -{ - u32 gpio = irq_to_gpio(d->irq); - _set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1); -} - -static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset); - -static int gpio_set_irq_type(struct irq_data *d, u32 type) -{ - u32 gpio = irq_to_gpio(d->irq); - struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32]; - u32 bit, val; - int edge; - void __iomem *reg = port->base; - - port->both_edges &= ~(1 << (gpio & 31)); - 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_EDGE_BOTH: - val = mxc_gpio_get(&port->chip, gpio & 31); - if (val) { - edge = GPIO_INT_LOW_LEV; - pr_debug("mxc: set GPIO %d to low trigger\n", gpio); - } else { - edge = GPIO_INT_HIGH_LEV; - pr_debug("mxc: set GPIO %d to high trigger\n", gpio); - } - port->both_edges |= 1 << (gpio & 31); - 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; - } - - reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ - bit = gpio & 0xf; - val = __raw_readl(reg) & ~(0x3 << (bit << 1)); - __raw_writel(val | (edge << (bit << 1)), reg); - _clear_gpio_irqstatus(port, gpio & 0x1f); - - return 0; -} - -static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio) -{ - void __iomem *reg = port->base; - u32 bit, val; - int edge; - - reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ - bit = gpio & 0xf; - val = __raw_readl(reg); - edge = (val >> (bit << 1)) & 3; - val &= ~(0x3 << (bit << 1)); - if (edge == GPIO_INT_HIGH_LEV) { - edge = GPIO_INT_LOW_LEV; - pr_debug("mxc: switch GPIO %d to low trigger\n", gpio); - } else if (edge == GPIO_INT_LOW_LEV) { - edge = GPIO_INT_HIGH_LEV; - pr_debug("mxc: switch GPIO %d to high trigger\n", gpio); - } else { - pr_err("mxc: invalid configuration for GPIO %d: %x\n", - gpio, edge); - return; - } - __raw_writel(val | (edge << (bit << 1)), reg); -} - -/* handle 32 interrupts in one status register */ -static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat) -{ - u32 gpio_irq_no_base = port->virtual_irq_start; - - while (irq_stat != 0) { - int irqoffset = fls(irq_stat) - 1; - - if (port->both_edges & (1 << irqoffset)) - mxc_flip_edge(port, irqoffset); - - generic_handle_irq(gpio_irq_no_base + irqoffset); - - irq_stat &= ~(1 << irqoffset); - } -} - -/* MX1 and MX3 has one interrupt *per* gpio port */ -static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc) -{ - u32 irq_stat; - struct mxc_gpio_port *port = irq_get_handler_data(irq); - - irq_stat = __raw_readl(port->base + GPIO_ISR) & - __raw_readl(port->base + GPIO_IMR); - - mxc_gpio_irq_handler(port, irq_stat); -} - -/* MX2 has one interrupt *for all* gpio ports */ -static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc) -{ - int i; - u32 irq_msk, irq_stat; - struct mxc_gpio_port *port = irq_get_handler_data(irq); - - /* walk through all interrupt status registers */ - for (i = 0; i < gpio_table_size; i++) { - irq_msk = __raw_readl(port[i].base + GPIO_IMR); - if (!irq_msk) - continue; - - irq_stat = __raw_readl(port[i].base + GPIO_ISR) & irq_msk; - if (irq_stat) - mxc_gpio_irq_handler(&port[i], irq_stat); - } -} - -/* - * 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 gpio_set_wake_irq(struct irq_data *d, u32 enable) -{ - u32 gpio = irq_to_gpio(d->irq); - u32 gpio_idx = gpio & 0x1F; - struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32]; - - if (enable) { - if (port->irq_high && (gpio_idx >= 16)) - enable_irq_wake(port->irq_high); - else - enable_irq_wake(port->irq); - } else { - if (port->irq_high && (gpio_idx >= 16)) - disable_irq_wake(port->irq_high); - else - disable_irq_wake(port->irq); - } - - return 0; -} - -static struct irq_chip gpio_irq_chip = { - .name = "GPIO", - .irq_ack = gpio_ack_irq, - .irq_mask = gpio_mask_irq, - .irq_unmask = gpio_unmask_irq, - .irq_set_type = gpio_set_irq_type, - .irq_set_wake = gpio_set_wake_irq, -}; - -static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset, - int dir) -{ - struct mxc_gpio_port *port = - container_of(chip, struct mxc_gpio_port, chip); - u32 l; - unsigned long flags; - - spin_lock_irqsave(&port->lock, flags); - l = __raw_readl(port->base + GPIO_GDIR); - if (dir) - l |= 1 << offset; - else - l &= ~(1 << offset); - __raw_writel(l, port->base + GPIO_GDIR); - spin_unlock_irqrestore(&port->lock, flags); -} - -static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value) -{ - struct mxc_gpio_port *port = - container_of(chip, struct mxc_gpio_port, chip); - void __iomem *reg = port->base + GPIO_DR; - u32 l; - unsigned long flags; - - spin_lock_irqsave(&port->lock, flags); - l = (__raw_readl(reg) & (~(1 << offset))) | (!!value << offset); - __raw_writel(l, reg); - spin_unlock_irqrestore(&port->lock, flags); -} - -static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset) -{ - struct mxc_gpio_port *port = - container_of(chip, struct mxc_gpio_port, chip); - - return (__raw_readl(port->base + GPIO_PSR) >> offset) & 1; -} - -static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset) -{ - _set_gpio_direction(chip, offset, 0); - return 0; -} - -static int mxc_gpio_direction_output(struct gpio_chip *chip, - unsigned offset, int value) -{ - mxc_gpio_set(chip, offset, value); - _set_gpio_direction(chip, offset, 1); - return 0; -} - -/* - * This lock class tells lockdep that GPIO irqs are in a different - * category than their parents, so it won't report false recursion. - */ -static struct lock_class_key gpio_lock_class; - -int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt) -{ - int i, j; - - /* save for local usage */ - mxc_gpio_ports = port; - gpio_table_size = cnt; - - printk(KERN_INFO "MXC GPIO hardware\n"); - - for (i = 0; i < cnt; i++) { - /* disable the interrupt and clear the status */ - __raw_writel(0, port[i].base + GPIO_IMR); - __raw_writel(~0, port[i].base + GPIO_ISR); - for (j = port[i].virtual_irq_start; - j < port[i].virtual_irq_start + 32; j++) { - irq_set_lockdep_class(j, &gpio_lock_class); - irq_set_chip_and_handler(j, &gpio_irq_chip, - handle_level_irq); - set_irq_flags(j, IRQF_VALID); - } - - /* register gpio chip */ - port[i].chip.direction_input = mxc_gpio_direction_input; - port[i].chip.direction_output = mxc_gpio_direction_output; - port[i].chip.get = mxc_gpio_get; - port[i].chip.set = mxc_gpio_set; - port[i].chip.base = i * 32; - port[i].chip.ngpio = 32; - - spin_lock_init(&port[i].lock); - - /* its a serious configuration bug when it fails */ - BUG_ON( gpiochip_add(&port[i].chip) < 0 ); - - if (cpu_is_mx1() || cpu_is_mx3() || cpu_is_mx25() || cpu_is_mx51()) { - /* setup one handler for each entry */ - irq_set_chained_handler(port[i].irq, - mx3_gpio_irq_handler); - irq_set_handler_data(port[i].irq, &port[i]); - if (port[i].irq_high) { - /* setup handler for GPIO 16 to 31 */ - irq_set_chained_handler(port[i].irq_high, - mx3_gpio_irq_handler); - irq_set_handler_data(port[i].irq_high, - &port[i]); - } - } - } - - if (cpu_is_mx2()) { - /* setup one handler for all GPIO interrupts */ - irq_set_chained_handler(port[0].irq, mx2_gpio_irq_handler); - irq_set_handler_data(port[0].irq, port); - } - - return 0; -} |