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- /*
- * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
- * JZ4740 platform GPIO support
- *
- * 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.
- *
- * 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.
- *
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/io.h>
- #include <linux/gpio.h>
- #include <linux/delay.h>
- #include <linux/interrupt.h>
- #include <linux/irqchip/ingenic.h>
- #include <linux/bitops.h>
- #include <linux/debugfs.h>
- #include <linux/seq_file.h>
- #include <asm/mach-jz4740/base.h>
- #include <asm/mach-jz4740/gpio.h>
- #define JZ4740_GPIO_BASE_A (32*0)
- #define JZ4740_GPIO_BASE_B (32*1)
- #define JZ4740_GPIO_BASE_C (32*2)
- #define JZ4740_GPIO_BASE_D (32*3)
- #define JZ4740_GPIO_NUM_A 32
- #define JZ4740_GPIO_NUM_B 32
- #define JZ4740_GPIO_NUM_C 31
- #define JZ4740_GPIO_NUM_D 32
- #define JZ4740_IRQ_GPIO_BASE_A (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_A)
- #define JZ4740_IRQ_GPIO_BASE_B (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_B)
- #define JZ4740_IRQ_GPIO_BASE_C (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_C)
- #define JZ4740_IRQ_GPIO_BASE_D (JZ4740_IRQ_GPIO(0) + JZ4740_GPIO_BASE_D)
- #define JZ_REG_GPIO_PIN 0x00
- #define JZ_REG_GPIO_DATA 0x10
- #define JZ_REG_GPIO_DATA_SET 0x14
- #define JZ_REG_GPIO_DATA_CLEAR 0x18
- #define JZ_REG_GPIO_MASK 0x20
- #define JZ_REG_GPIO_MASK_SET 0x24
- #define JZ_REG_GPIO_MASK_CLEAR 0x28
- #define JZ_REG_GPIO_PULL 0x30
- #define JZ_REG_GPIO_PULL_SET 0x34
- #define JZ_REG_GPIO_PULL_CLEAR 0x38
- #define JZ_REG_GPIO_FUNC 0x40
- #define JZ_REG_GPIO_FUNC_SET 0x44
- #define JZ_REG_GPIO_FUNC_CLEAR 0x48
- #define JZ_REG_GPIO_SELECT 0x50
- #define JZ_REG_GPIO_SELECT_SET 0x54
- #define JZ_REG_GPIO_SELECT_CLEAR 0x58
- #define JZ_REG_GPIO_DIRECTION 0x60
- #define JZ_REG_GPIO_DIRECTION_SET 0x64
- #define JZ_REG_GPIO_DIRECTION_CLEAR 0x68
- #define JZ_REG_GPIO_TRIGGER 0x70
- #define JZ_REG_GPIO_TRIGGER_SET 0x74
- #define JZ_REG_GPIO_TRIGGER_CLEAR 0x78
- #define JZ_REG_GPIO_FLAG 0x80
- #define JZ_REG_GPIO_FLAG_CLEAR 0x14
- #define GPIO_TO_BIT(gpio) BIT(gpio & 0x1f)
- #define GPIO_TO_REG(gpio, reg) (gpio_to_jz_gpio_chip(gpio)->base + (reg))
- #define CHIP_TO_REG(chip, reg) (gpio_chip_to_jz_gpio_chip(chip)->base + (reg))
- struct jz_gpio_chip {
- unsigned int irq;
- unsigned int irq_base;
- uint32_t edge_trigger_both;
- void __iomem *base;
- struct gpio_chip gpio_chip;
- };
- static struct jz_gpio_chip jz4740_gpio_chips[];
- static inline struct jz_gpio_chip *gpio_to_jz_gpio_chip(unsigned int gpio)
- {
- return &jz4740_gpio_chips[gpio >> 5];
- }
- static inline struct jz_gpio_chip *gpio_chip_to_jz_gpio_chip(struct gpio_chip *gpio_chip)
- {
- return container_of(gpio_chip, struct jz_gpio_chip, gpio_chip);
- }
- static inline struct jz_gpio_chip *irq_to_jz_gpio_chip(struct irq_data *data)
- {
- struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
- return gc->private;
- }
- static inline void jz_gpio_write_bit(unsigned int gpio, unsigned int reg)
- {
- writel(GPIO_TO_BIT(gpio), GPIO_TO_REG(gpio, reg));
- }
- int jz_gpio_set_function(int gpio, enum jz_gpio_function function)
- {
- if (function == JZ_GPIO_FUNC_NONE) {
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_CLEAR);
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
- } else {
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_FUNC_SET);
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_CLEAR);
- switch (function) {
- case JZ_GPIO_FUNC1:
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_CLEAR);
- break;
- case JZ_GPIO_FUNC3:
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_TRIGGER_SET);
- case JZ_GPIO_FUNC2: /* Falltrough */
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_SELECT_SET);
- break;
- default:
- BUG();
- break;
- }
- }
- return 0;
- }
- EXPORT_SYMBOL_GPL(jz_gpio_set_function);
- int jz_gpio_bulk_request(const struct jz_gpio_bulk_request *request, size_t num)
- {
- size_t i;
- int ret;
- for (i = 0; i < num; ++i, ++request) {
- ret = gpio_request(request->gpio, request->name);
- if (ret)
- goto err;
- jz_gpio_set_function(request->gpio, request->function);
- }
- return 0;
- err:
- for (--request; i > 0; --i, --request) {
- gpio_free(request->gpio);
- jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
- }
- return ret;
- }
- EXPORT_SYMBOL_GPL(jz_gpio_bulk_request);
- void jz_gpio_bulk_free(const struct jz_gpio_bulk_request *request, size_t num)
- {
- size_t i;
- for (i = 0; i < num; ++i, ++request) {
- gpio_free(request->gpio);
- jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
- }
- }
- EXPORT_SYMBOL_GPL(jz_gpio_bulk_free);
- void jz_gpio_bulk_suspend(const struct jz_gpio_bulk_request *request, size_t num)
- {
- size_t i;
- for (i = 0; i < num; ++i, ++request) {
- jz_gpio_set_function(request->gpio, JZ_GPIO_FUNC_NONE);
- jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_DIRECTION_CLEAR);
- jz_gpio_write_bit(request->gpio, JZ_REG_GPIO_PULL_SET);
- }
- }
- EXPORT_SYMBOL_GPL(jz_gpio_bulk_suspend);
- void jz_gpio_bulk_resume(const struct jz_gpio_bulk_request *request, size_t num)
- {
- size_t i;
- for (i = 0; i < num; ++i, ++request)
- jz_gpio_set_function(request->gpio, request->function);
- }
- EXPORT_SYMBOL_GPL(jz_gpio_bulk_resume);
- void jz_gpio_enable_pullup(unsigned gpio)
- {
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_CLEAR);
- }
- EXPORT_SYMBOL_GPL(jz_gpio_enable_pullup);
- void jz_gpio_disable_pullup(unsigned gpio)
- {
- jz_gpio_write_bit(gpio, JZ_REG_GPIO_PULL_SET);
- }
- EXPORT_SYMBOL_GPL(jz_gpio_disable_pullup);
- static int jz_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
- {
- return !!(readl(CHIP_TO_REG(chip, JZ_REG_GPIO_PIN)) & BIT(gpio));
- }
- static void jz_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
- {
- uint32_t __iomem *reg = CHIP_TO_REG(chip, JZ_REG_GPIO_DATA_SET);
- reg += !value;
- writel(BIT(gpio), reg);
- }
- static int jz_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
- int value)
- {
- writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_SET));
- jz_gpio_set_value(chip, gpio, value);
- return 0;
- }
- static int jz_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
- {
- writel(BIT(gpio), CHIP_TO_REG(chip, JZ_REG_GPIO_DIRECTION_CLEAR));
- return 0;
- }
- static int jz_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
- {
- struct jz_gpio_chip *jz_gpio = gpio_chip_to_jz_gpio_chip(chip);
- return jz_gpio->irq_base + gpio;
- }
- int jz_gpio_port_direction_input(int port, uint32_t mask)
- {
- writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_CLEAR));
- return 0;
- }
- EXPORT_SYMBOL(jz_gpio_port_direction_input);
- int jz_gpio_port_direction_output(int port, uint32_t mask)
- {
- writel(mask, GPIO_TO_REG(port, JZ_REG_GPIO_DIRECTION_SET));
- return 0;
- }
- EXPORT_SYMBOL(jz_gpio_port_direction_output);
- void jz_gpio_port_set_value(int port, uint32_t value, uint32_t mask)
- {
- writel(~value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_CLEAR));
- writel(value & mask, GPIO_TO_REG(port, JZ_REG_GPIO_DATA_SET));
- }
- EXPORT_SYMBOL(jz_gpio_port_set_value);
- uint32_t jz_gpio_port_get_value(int port, uint32_t mask)
- {
- uint32_t value = readl(GPIO_TO_REG(port, JZ_REG_GPIO_PIN));
- return value & mask;
- }
- EXPORT_SYMBOL(jz_gpio_port_get_value);
- #define IRQ_TO_BIT(irq) BIT(irq_to_gpio(irq) & 0x1f)
- static void jz_gpio_check_trigger_both(struct jz_gpio_chip *chip, unsigned int irq)
- {
- uint32_t value;
- void __iomem *reg;
- uint32_t mask = IRQ_TO_BIT(irq);
- if (!(chip->edge_trigger_both & mask))
- return;
- reg = chip->base;
- value = readl(chip->base + JZ_REG_GPIO_PIN);
- if (value & mask)
- reg += JZ_REG_GPIO_DIRECTION_CLEAR;
- else
- reg += JZ_REG_GPIO_DIRECTION_SET;
- writel(mask, reg);
- }
- static void jz_gpio_irq_demux_handler(struct irq_desc *desc)
- {
- uint32_t flag;
- unsigned int gpio_irq;
- struct jz_gpio_chip *chip = irq_desc_get_handler_data(desc);
- flag = readl(chip->base + JZ_REG_GPIO_FLAG);
- if (!flag)
- return;
- gpio_irq = chip->irq_base + __fls(flag);
- jz_gpio_check_trigger_both(chip, gpio_irq);
- generic_handle_irq(gpio_irq);
- };
- static inline void jz_gpio_set_irq_bit(struct irq_data *data, unsigned int reg)
- {
- struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
- writel(IRQ_TO_BIT(data->irq), chip->base + reg);
- }
- static void jz_gpio_irq_unmask(struct irq_data *data)
- {
- struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
- jz_gpio_check_trigger_both(chip, data->irq);
- irq_gc_unmask_enable_reg(data);
- };
- /* TODO: Check if function is gpio */
- static unsigned int jz_gpio_irq_startup(struct irq_data *data)
- {
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_SET);
- jz_gpio_irq_unmask(data);
- return 0;
- }
- static void jz_gpio_irq_shutdown(struct irq_data *data)
- {
- irq_gc_mask_disable_reg(data);
- /* Set direction to input */
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_SELECT_CLEAR);
- }
- static int jz_gpio_irq_set_type(struct irq_data *data, unsigned int flow_type)
- {
- struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
- unsigned int irq = data->irq;
- if (flow_type == IRQ_TYPE_EDGE_BOTH) {
- uint32_t value = readl(chip->base + JZ_REG_GPIO_PIN);
- if (value & IRQ_TO_BIT(irq))
- flow_type = IRQ_TYPE_EDGE_FALLING;
- else
- flow_type = IRQ_TYPE_EDGE_RISING;
- chip->edge_trigger_both |= IRQ_TO_BIT(irq);
- } else {
- chip->edge_trigger_both &= ~IRQ_TO_BIT(irq);
- }
- switch (flow_type) {
- case IRQ_TYPE_EDGE_RISING:
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
- break;
- case IRQ_TYPE_EDGE_FALLING:
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_SET);
- break;
- case IRQ_TYPE_LEVEL_HIGH:
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_SET);
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
- break;
- case IRQ_TYPE_LEVEL_LOW:
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_DIRECTION_CLEAR);
- jz_gpio_set_irq_bit(data, JZ_REG_GPIO_TRIGGER_CLEAR);
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- static int jz_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
- {
- struct jz_gpio_chip *chip = irq_to_jz_gpio_chip(data);
- irq_gc_set_wake(data, on);
- irq_set_irq_wake(chip->irq, on);
- return 0;
- }
- #define JZ4740_GPIO_CHIP(_bank) { \
- .irq_base = JZ4740_IRQ_GPIO_BASE_ ## _bank, \
- .gpio_chip = { \
- .label = "Bank " # _bank, \
- .owner = THIS_MODULE, \
- .set = jz_gpio_set_value, \
- .get = jz_gpio_get_value, \
- .direction_output = jz_gpio_direction_output, \
- .direction_input = jz_gpio_direction_input, \
- .to_irq = jz_gpio_to_irq, \
- .base = JZ4740_GPIO_BASE_ ## _bank, \
- .ngpio = JZ4740_GPIO_NUM_ ## _bank, \
- }, \
- }
- static struct jz_gpio_chip jz4740_gpio_chips[] = {
- JZ4740_GPIO_CHIP(A),
- JZ4740_GPIO_CHIP(B),
- JZ4740_GPIO_CHIP(C),
- JZ4740_GPIO_CHIP(D),
- };
- static void jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
- {
- struct irq_chip_generic *gc;
- struct irq_chip_type *ct;
- chip->base = ioremap(JZ4740_GPIO_BASE_ADDR + (id * 0x100), 0x100);
- chip->irq = JZ4740_IRQ_INTC_GPIO(id);
- irq_set_chained_handler_and_data(chip->irq,
- jz_gpio_irq_demux_handler, chip);
- gc = irq_alloc_generic_chip(chip->gpio_chip.label, 1, chip->irq_base,
- chip->base, handle_level_irq);
- gc->wake_enabled = IRQ_MSK(chip->gpio_chip.ngpio);
- gc->private = chip;
- ct = gc->chip_types;
- ct->regs.enable = JZ_REG_GPIO_MASK_CLEAR;
- ct->regs.disable = JZ_REG_GPIO_MASK_SET;
- ct->regs.ack = JZ_REG_GPIO_FLAG_CLEAR;
- ct->chip.name = "GPIO";
- ct->chip.irq_mask = irq_gc_mask_disable_reg;
- ct->chip.irq_unmask = jz_gpio_irq_unmask;
- ct->chip.irq_ack = irq_gc_ack_set_bit;
- ct->chip.irq_suspend = ingenic_intc_irq_suspend;
- ct->chip.irq_resume = ingenic_intc_irq_resume;
- ct->chip.irq_startup = jz_gpio_irq_startup;
- ct->chip.irq_shutdown = jz_gpio_irq_shutdown;
- ct->chip.irq_set_type = jz_gpio_irq_set_type;
- ct->chip.irq_set_wake = jz_gpio_irq_set_wake;
- ct->chip.flags = IRQCHIP_SET_TYPE_MASKED;
- irq_setup_generic_chip(gc, IRQ_MSK(chip->gpio_chip.ngpio),
- IRQ_GC_INIT_NESTED_LOCK, 0, IRQ_NOPROBE | IRQ_LEVEL);
- gpiochip_add(&chip->gpio_chip);
- }
- static int __init jz4740_gpio_init(void)
- {
- unsigned int i;
- for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i)
- jz4740_gpio_chip_init(&jz4740_gpio_chips[i], i);
- printk(KERN_INFO "JZ4740 GPIO initialized\n");
- return 0;
- }
- arch_initcall(jz4740_gpio_init);
- #ifdef CONFIG_DEBUG_FS
- static inline void gpio_seq_reg(struct seq_file *s, struct jz_gpio_chip *chip,
- const char *name, unsigned int reg)
- {
- seq_printf(s, "\t%s: %08x\n", name, readl(chip->base + reg));
- }
- static int gpio_regs_show(struct seq_file *s, void *unused)
- {
- struct jz_gpio_chip *chip = jz4740_gpio_chips;
- int i;
- for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i, ++chip) {
- seq_printf(s, "==GPIO %d==\n", i);
- gpio_seq_reg(s, chip, "Pin", JZ_REG_GPIO_PIN);
- gpio_seq_reg(s, chip, "Data", JZ_REG_GPIO_DATA);
- gpio_seq_reg(s, chip, "Mask", JZ_REG_GPIO_MASK);
- gpio_seq_reg(s, chip, "Pull", JZ_REG_GPIO_PULL);
- gpio_seq_reg(s, chip, "Func", JZ_REG_GPIO_FUNC);
- gpio_seq_reg(s, chip, "Select", JZ_REG_GPIO_SELECT);
- gpio_seq_reg(s, chip, "Direction", JZ_REG_GPIO_DIRECTION);
- gpio_seq_reg(s, chip, "Trigger", JZ_REG_GPIO_TRIGGER);
- gpio_seq_reg(s, chip, "Flag", JZ_REG_GPIO_FLAG);
- }
- return 0;
- }
- static int gpio_regs_open(struct inode *inode, struct file *file)
- {
- return single_open(file, gpio_regs_show, NULL);
- }
- static const struct file_operations gpio_regs_operations = {
- .open = gpio_regs_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
- };
- static int __init gpio_debugfs_init(void)
- {
- (void) debugfs_create_file("jz_regs_gpio", S_IFREG | S_IRUGO,
- NULL, NULL, &gpio_regs_operations);
- return 0;
- }
- subsys_initcall(gpio_debugfs_init);
- #endif
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