397 lines
9.6 KiB
C
397 lines
9.6 KiB
C
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/*
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* Generic GPIO driver for logic cells found in the Nomadik SoC
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*
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* Copyright (C) 2008,2009 STMicroelectronics
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* Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
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* Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
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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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#include <linux/kernel.h>
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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/io.h>
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#include <linux/gpio.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <mach/hardware.h>
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#include <mach/gpio.h>
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/*
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* The GPIO module in the Nomadik family of Systems-on-Chip is an
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* AMBA device, managing 32 pins and alternate functions. The logic block
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* is currently only used in the Nomadik.
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*
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* Symbols in this file are called "nmk_gpio" for "nomadik gpio"
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*/
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#define NMK_GPIO_PER_CHIP 32
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struct nmk_gpio_chip {
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struct gpio_chip chip;
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void __iomem *addr;
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unsigned int parent_irq;
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spinlock_t *lock;
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/* Keep track of configured edges */
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u32 edge_rising;
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u32 edge_falling;
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};
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/* Mode functions */
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int nmk_gpio_set_mode(int gpio, int gpio_mode)
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{
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struct nmk_gpio_chip *nmk_chip;
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unsigned long flags;
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u32 afunc, bfunc, bit;
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nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
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if (!nmk_chip)
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return -EINVAL;
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bit = 1 << (gpio - nmk_chip->chip.base);
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spin_lock_irqsave(&nmk_chip->lock, flags);
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afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
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bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
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if (gpio_mode & NMK_GPIO_ALT_A)
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afunc |= bit;
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if (gpio_mode & NMK_GPIO_ALT_B)
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bfunc |= bit;
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writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
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writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
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spin_unlock_irqrestore(&nmk_chip->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(nmk_gpio_set_mode);
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int nmk_gpio_get_mode(int gpio)
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{
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struct nmk_gpio_chip *nmk_chip;
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u32 afunc, bfunc, bit;
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nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
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if (!nmk_chip)
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return -EINVAL;
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bit = 1 << (gpio - nmk_chip->chip.base);
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afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
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bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
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return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
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}
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EXPORT_SYMBOL(nmk_gpio_get_mode);
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/* IRQ functions */
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static inline int nmk_gpio_get_bitmask(int gpio)
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{
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return 1 << (gpio % 32);
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}
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static void nmk_gpio_irq_ack(unsigned int irq)
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{
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int gpio;
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struct nmk_gpio_chip *nmk_chip;
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gpio = NOMADIK_IRQ_TO_GPIO(irq);
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nmk_chip = get_irq_chip_data(irq);
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if (!nmk_chip)
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return;
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writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
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}
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static void nmk_gpio_irq_mask(unsigned int irq)
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{
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int gpio;
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struct nmk_gpio_chip *nmk_chip;
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unsigned long flags;
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u32 bitmask, reg;
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gpio = NOMADIK_IRQ_TO_GPIO(irq);
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nmk_chip = get_irq_chip_data(irq);
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bitmask = nmk_gpio_get_bitmask(gpio);
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if (!nmk_chip)
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return;
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/* we must individually clear the two edges */
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spin_lock_irqsave(&nmk_chip->lock, flags);
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if (nmk_chip->edge_rising & bitmask) {
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reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
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reg &= ~bitmask;
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writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
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}
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if (nmk_chip->edge_falling & bitmask) {
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reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
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reg &= ~bitmask;
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writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
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}
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spin_unlock_irqrestore(&nmk_chip->lock, flags);
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};
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static void nmk_gpio_irq_unmask(unsigned int irq)
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{
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int gpio;
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struct nmk_gpio_chip *nmk_chip;
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unsigned long flags;
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u32 bitmask, reg;
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gpio = NOMADIK_IRQ_TO_GPIO(irq);
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nmk_chip = get_irq_chip_data(irq);
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bitmask = nmk_gpio_get_bitmask(gpio);
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if (!nmk_chip)
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return;
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/* we must individually set the two edges */
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spin_lock_irqsave(&nmk_chip->lock, flags);
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if (nmk_chip->edge_rising & bitmask) {
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reg = readl(nmk_chip->addr + NMK_GPIO_RWIMSC);
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reg |= bitmask;
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writel(reg, nmk_chip->addr + NMK_GPIO_RWIMSC);
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}
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if (nmk_chip->edge_falling & bitmask) {
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reg = readl(nmk_chip->addr + NMK_GPIO_FWIMSC);
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reg |= bitmask;
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writel(reg, nmk_chip->addr + NMK_GPIO_FWIMSC);
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}
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spin_unlock_irqrestore(&nmk_chip->lock, flags);
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}
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static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
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{
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int gpio;
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struct nmk_gpio_chip *nmk_chip;
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unsigned long flags;
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u32 bitmask;
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gpio = NOMADIK_IRQ_TO_GPIO(irq);
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nmk_chip = get_irq_chip_data(irq);
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bitmask = nmk_gpio_get_bitmask(gpio);
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if (!nmk_chip)
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return -EINVAL;
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if (type & IRQ_TYPE_LEVEL_HIGH)
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return -EINVAL;
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if (type & IRQ_TYPE_LEVEL_LOW)
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return -EINVAL;
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spin_lock_irqsave(&nmk_chip->lock, flags);
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nmk_chip->edge_rising &= ~bitmask;
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if (type & IRQ_TYPE_EDGE_RISING)
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nmk_chip->edge_rising |= bitmask;
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writel(nmk_chip->edge_rising, nmk_chip->addr + NMK_GPIO_RIMSC);
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nmk_chip->edge_falling &= ~bitmask;
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if (type & IRQ_TYPE_EDGE_FALLING)
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nmk_chip->edge_falling |= bitmask;
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writel(nmk_chip->edge_falling, nmk_chip->addr + NMK_GPIO_FIMSC);
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spin_unlock_irqrestore(&nmk_chip->lock, flags);
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nmk_gpio_irq_unmask(irq);
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return 0;
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}
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static struct irq_chip nmk_gpio_irq_chip = {
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.name = "Nomadik-GPIO",
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.ack = nmk_gpio_irq_ack,
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.mask = nmk_gpio_irq_mask,
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.unmask = nmk_gpio_irq_unmask,
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.set_type = nmk_gpio_irq_set_type,
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};
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static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
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{
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struct nmk_gpio_chip *nmk_chip;
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struct irq_chip *host_chip;
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unsigned int gpio_irq;
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u32 pending;
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unsigned int first_irq;
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nmk_chip = get_irq_data(irq);
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first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
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while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
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gpio_irq = first_irq + __ffs(pending);
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generic_handle_irq(gpio_irq);
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}
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if (0) {/* don't ack parent irq, as ack == disable */
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host_chip = get_irq_chip(irq);
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host_chip->ack(irq);
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}
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}
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static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
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{
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unsigned int first_irq;
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int i;
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first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
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for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
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set_irq_chip(i, &nmk_gpio_irq_chip);
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set_irq_handler(i, handle_edge_irq);
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set_irq_flags(i, IRQF_VALID);
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set_irq_chip_data(i, nmk_chip);
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}
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set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
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set_irq_data(nmk_chip->parent_irq, nmk_chip);
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return 0;
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}
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/* I/O Functions */
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static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
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{
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struct nmk_gpio_chip *nmk_chip =
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container_of(chip, struct nmk_gpio_chip, chip);
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writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
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return 0;
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}
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static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
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int val)
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{
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struct nmk_gpio_chip *nmk_chip =
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container_of(chip, struct nmk_gpio_chip, chip);
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writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
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return 0;
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}
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static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
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{
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struct nmk_gpio_chip *nmk_chip =
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container_of(chip, struct nmk_gpio_chip, chip);
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u32 bit = 1 << offset;
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return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
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}
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static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
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int val)
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{
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struct nmk_gpio_chip *nmk_chip =
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container_of(chip, struct nmk_gpio_chip, chip);
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u32 bit = 1 << offset;
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if (val)
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writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
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else
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writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
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}
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/* This structure is replicated for each GPIO block allocated at probe time */
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static struct gpio_chip nmk_gpio_template = {
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.direction_input = nmk_gpio_make_input,
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.get = nmk_gpio_get_input,
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.direction_output = nmk_gpio_make_output,
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.set = nmk_gpio_set_output,
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.ngpio = NMK_GPIO_PER_CHIP,
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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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{
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struct nmk_gpio_platform_data *pdata;
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struct nmk_gpio_chip *nmk_chip;
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struct gpio_chip *chip;
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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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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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}
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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->chip = nmk_gpio_template;
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nmk_chip->parent_irq = pdata->parent_irq;
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chip = &nmk_chip->chip;
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chip->base = pdata->first_gpio;
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chip->label = pdata->name;
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chip->dev = &dev->dev;
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chip->owner = THIS_MODULE;
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ret = gpiochip_add(&nmk_chip->chip);
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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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nmk_gpio_init_irq(nmk_chip);
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dev_info(&dev->dev, "Bits %i-%i at address %p\n",
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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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kfree(nmk_chip);
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out_amba:
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amba_release_regions(dev);
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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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{
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struct nmk_gpio_chip *nmk_chip;
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nmk_chip = amba_get_drvdata(dev);
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gpiochip_remove(&nmk_chip->chip);
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|
|
kfree(nmk_chip);
|
||
|
|
amba_release_regions(dev);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* We have 0x1f080060 and 0x1f180060, accept both using the mask */
|
||
|
|
static struct amba_id nmk_gpio_ids[] = {
|
||
|
|
{
|
||
|
|
.id = 0x1f080060,
|
||
|
|
.mask = 0xffefffff,
|
||
|
|
},
|
||
|
|
{0, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct amba_driver nmk_gpio_driver = {
|
||
|
|
.drv = {
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.name = "gpio",
|
||
|
|
},
|
||
|
|
.probe = nmk_gpio_probe,
|
||
|
|
.remove = nmk_gpio_remove,
|
||
|
|
.suspend = NULL, /* to be done */
|
||
|
|
.resume = NULL,
|
||
|
|
.id_table = nmk_gpio_ids,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init nmk_gpio_init(void)
|
||
|
|
{
|
||
|
|
return amba_driver_register(&nmk_gpio_driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
arch_initcall(nmk_gpio_init);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
|
||
|
|
MODULE_DESCRIPTION("Nomadik GPIO Driver");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
|
||
|
|
|