diff options
Diffstat (limited to 'arch/arm/plat-orion/gpio.c')
-rw-r--r-- | arch/arm/plat-orion/gpio.c | 456 |
1 files changed, 310 insertions, 146 deletions
diff --git a/arch/arm/plat-orion/gpio.c b/arch/arm/plat-orion/gpio.c index 5f35223..078894b 100644 --- a/arch/arm/plat-orion/gpio.c +++ b/arch/arm/plat-orion/gpio.c @@ -17,55 +17,123 @@ #include <linux/io.h> #include <linux/gpio.h> -static DEFINE_SPINLOCK(gpio_lock); -static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)]; -static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)]; +/* + * GPIO unit register offsets. + */ +#define GPIO_OUT_OFF 0x0000 +#define GPIO_IO_CONF_OFF 0x0004 +#define GPIO_BLINK_EN_OFF 0x0008 +#define GPIO_IN_POL_OFF 0x000c +#define GPIO_DATA_IN_OFF 0x0010 +#define GPIO_EDGE_CAUSE_OFF 0x0014 +#define GPIO_EDGE_MASK_OFF 0x0018 +#define GPIO_LEVEL_MASK_OFF 0x001c + +struct orion_gpio_chip { + struct gpio_chip chip; + spinlock_t lock; + void __iomem *base; + unsigned long valid_input; + unsigned long valid_output; + int mask_offset; + int secondary_irq_base; +}; + +static void __iomem *GPIO_OUT(struct orion_gpio_chip *ochip) +{ + return ochip->base + GPIO_OUT_OFF; +} + +static void __iomem *GPIO_IO_CONF(struct orion_gpio_chip *ochip) +{ + return ochip->base + GPIO_IO_CONF_OFF; +} + +static void __iomem *GPIO_BLINK_EN(struct orion_gpio_chip *ochip) +{ + return ochip->base + GPIO_BLINK_EN_OFF; +} + +static void __iomem *GPIO_IN_POL(struct orion_gpio_chip *ochip) +{ + return ochip->base + GPIO_IN_POL_OFF; +} + +static void __iomem *GPIO_DATA_IN(struct orion_gpio_chip *ochip) +{ + return ochip->base + GPIO_DATA_IN_OFF; +} + +static void __iomem *GPIO_EDGE_CAUSE(struct orion_gpio_chip *ochip) +{ + return ochip->base + GPIO_EDGE_CAUSE_OFF; +} + +static void __iomem *GPIO_EDGE_MASK(struct orion_gpio_chip *ochip) +{ + return ochip->base + ochip->mask_offset + GPIO_EDGE_MASK_OFF; +} + +static void __iomem *GPIO_LEVEL_MASK(struct orion_gpio_chip *ochip) +{ + return ochip->base + ochip->mask_offset + GPIO_LEVEL_MASK_OFF; +} + -static inline void __set_direction(unsigned pin, int input) +static struct orion_gpio_chip orion_gpio_chips[2]; +static int orion_gpio_chip_count; + +static inline void +__set_direction(struct orion_gpio_chip *ochip, unsigned pin, int input) { u32 u; - u = readl(GPIO_IO_CONF(pin)); + u = readl(GPIO_IO_CONF(ochip)); if (input) - u |= 1 << (pin & 31); + u |= 1 << pin; else - u &= ~(1 << (pin & 31)); - writel(u, GPIO_IO_CONF(pin)); + u &= ~(1 << pin); + writel(u, GPIO_IO_CONF(ochip)); } -static void __set_level(unsigned pin, int high) +static void __set_level(struct orion_gpio_chip *ochip, unsigned pin, int high) { u32 u; - u = readl(GPIO_OUT(pin)); + u = readl(GPIO_OUT(ochip)); if (high) - u |= 1 << (pin & 31); + u |= 1 << pin; else - u &= ~(1 << (pin & 31)); - writel(u, GPIO_OUT(pin)); + u &= ~(1 << pin); + writel(u, GPIO_OUT(ochip)); } -static inline void __set_blinking(unsigned pin, int blink) +static inline void +__set_blinking(struct orion_gpio_chip *ochip, unsigned pin, int blink) { u32 u; - u = readl(GPIO_BLINK_EN(pin)); + u = readl(GPIO_BLINK_EN(ochip)); if (blink) - u |= 1 << (pin & 31); + u |= 1 << pin; else - u &= ~(1 << (pin & 31)); - writel(u, GPIO_BLINK_EN(pin)); + u &= ~(1 << pin); + writel(u, GPIO_BLINK_EN(ochip)); } -static inline int orion_gpio_is_valid(unsigned pin, int mode) +static inline int +orion_gpio_is_valid(struct orion_gpio_chip *ochip, unsigned pin, int mode) { - if (pin < GPIO_MAX) { - if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input)) - goto err_out; - if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output)) - goto err_out; - return true; - } + if (pin >= ochip->chip.ngpio) + goto err_out; + + if ((mode & GPIO_INPUT_OK) && !test_bit(pin, &ochip->valid_input)) + goto err_out; + + if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, &ochip->valid_output)) + goto err_out; + + return 1; err_out: pr_debug("%s: invalid GPIO %d\n", __func__, pin); @@ -75,134 +143,155 @@ err_out: /* * GENERIC_GPIO primitives. */ +static int orion_gpio_request(struct gpio_chip *chip, unsigned pin) +{ + struct orion_gpio_chip *ochip = + container_of(chip, struct orion_gpio_chip, chip); + + if (orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK) || + orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK)) + return 0; + + return -EINVAL; +} + static int orion_gpio_direction_input(struct gpio_chip *chip, unsigned pin) { + struct orion_gpio_chip *ochip = + container_of(chip, struct orion_gpio_chip, chip); unsigned long flags; - if (!orion_gpio_is_valid(pin, GPIO_INPUT_OK)) + if (!orion_gpio_is_valid(ochip, pin, GPIO_INPUT_OK)) return -EINVAL; - spin_lock_irqsave(&gpio_lock, flags); - - /* Configure GPIO direction. */ - __set_direction(pin, 1); - - spin_unlock_irqrestore(&gpio_lock, flags); + spin_lock_irqsave(&ochip->lock, flags); + __set_direction(ochip, pin, 1); + spin_unlock_irqrestore(&ochip->lock, flags); return 0; } -static int orion_gpio_get_value(struct gpio_chip *chip, unsigned pin) +static int orion_gpio_get(struct gpio_chip *chip, unsigned pin) { + struct orion_gpio_chip *ochip = + container_of(chip, struct orion_gpio_chip, chip); int val; - if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31))) - val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin)); - else - val = readl(GPIO_OUT(pin)); + if (readl(GPIO_IO_CONF(ochip)) & (1 << pin)) { + val = readl(GPIO_DATA_IN(ochip)) ^ readl(GPIO_IN_POL(ochip)); + } else { + val = readl(GPIO_OUT(ochip)); + } - return (val >> (pin & 31)) & 1; + return (val >> pin) & 1; } -static int orion_gpio_direction_output(struct gpio_chip *chip, unsigned pin, - int value) +static int +orion_gpio_direction_output(struct gpio_chip *chip, unsigned pin, int value) { + struct orion_gpio_chip *ochip = + container_of(chip, struct orion_gpio_chip, chip); unsigned long flags; - if (!orion_gpio_is_valid(pin, GPIO_OUTPUT_OK)) + if (!orion_gpio_is_valid(ochip, pin, GPIO_OUTPUT_OK)) return -EINVAL; - spin_lock_irqsave(&gpio_lock, flags); - - /* Disable blinking. */ - __set_blinking(pin, 0); - - /* Configure GPIO output value. */ - __set_level(pin, value); - - /* Configure GPIO direction. */ - __set_direction(pin, 0); - - spin_unlock_irqrestore(&gpio_lock, flags); + spin_lock_irqsave(&ochip->lock, flags); + __set_blinking(ochip, pin, 0); + __set_level(ochip, pin, value); + __set_direction(ochip, pin, 0); + spin_unlock_irqrestore(&ochip->lock, flags); return 0; } -static void orion_gpio_set_value(struct gpio_chip *chip, unsigned pin, - int value) +static void orion_gpio_set(struct gpio_chip *chip, unsigned pin, int value) { + struct orion_gpio_chip *ochip = + container_of(chip, struct orion_gpio_chip, chip); unsigned long flags; - spin_lock_irqsave(&gpio_lock, flags); - - /* Configure GPIO output value. */ - __set_level(pin, value); - - spin_unlock_irqrestore(&gpio_lock, flags); + spin_lock_irqsave(&ochip->lock, flags); + __set_level(ochip, pin, value); + spin_unlock_irqrestore(&ochip->lock, flags); } -static int orion_gpio_request(struct gpio_chip *chip, unsigned pin) +static int orion_gpio_to_irq(struct gpio_chip *chip, unsigned pin) { - if (orion_gpio_is_valid(pin, GPIO_INPUT_OK) || - orion_gpio_is_valid(pin, GPIO_OUTPUT_OK)) - return 0; - return -EINVAL; -} + struct orion_gpio_chip *ochip = + container_of(chip, struct orion_gpio_chip, chip); -static struct gpio_chip orion_gpiochip = { - .label = "orion_gpio", - .direction_input = orion_gpio_direction_input, - .get = orion_gpio_get_value, - .direction_output = orion_gpio_direction_output, - .set = orion_gpio_set_value, - .request = orion_gpio_request, - .base = 0, - .ngpio = GPIO_MAX, - .can_sleep = 0, -}; - -void __init orion_gpio_init(void) -{ - gpiochip_add(&orion_gpiochip); + return ochip->secondary_irq_base + pin; } + /* * Orion-specific GPIO API extensions. */ +static struct orion_gpio_chip *orion_gpio_chip_find(int pin) +{ + int i; + + for (i = 0; i < orion_gpio_chip_count; i++) { + struct orion_gpio_chip *ochip = orion_gpio_chips + i; + struct gpio_chip *chip = &ochip->chip; + + if (pin >= chip->base && pin < chip->base + chip->ngpio) + return ochip; + } + + return NULL; +} + void __init orion_gpio_set_unused(unsigned pin) { + struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin); + + if (ochip == NULL) + return; + + pin -= ochip->chip.base; + /* Configure as output, drive low. */ - __set_level(pin, 0); - __set_direction(pin, 0); + __set_level(ochip, pin, 0); + __set_direction(ochip, pin, 0); } void __init orion_gpio_set_valid(unsigned pin, int mode) { + struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin); + + if (ochip == NULL) + return; + + pin -= ochip->chip.base; + if (mode == 1) mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK; + if (mode & GPIO_INPUT_OK) - __set_bit(pin, gpio_valid_input); + __set_bit(pin, &ochip->valid_input); else - __clear_bit(pin, gpio_valid_input); + __clear_bit(pin, &ochip->valid_input); + if (mode & GPIO_OUTPUT_OK) - __set_bit(pin, gpio_valid_output); + __set_bit(pin, &ochip->valid_output); else - __clear_bit(pin, gpio_valid_output); + __clear_bit(pin, &ochip->valid_output); } void orion_gpio_set_blink(unsigned pin, int blink) { + struct orion_gpio_chip *ochip = orion_gpio_chip_find(pin); unsigned long flags; - spin_lock_irqsave(&gpio_lock, flags); + if (ochip == NULL) + return; - /* Set output value to zero. */ - __set_level(pin, 0); - - /* Set blinking. */ - __set_blinking(pin, blink); - - spin_unlock_irqrestore(&gpio_lock, flags); + spin_lock_irqsave(&ochip->lock, flags); + __set_level(ochip, pin, 0); + __set_blinking(ochip, pin, blink); + spin_unlock_irqrestore(&ochip->lock, flags); } EXPORT_SYMBOL(orion_gpio_set_blink); @@ -234,59 +323,78 @@ EXPORT_SYMBOL(orion_gpio_set_blink); ****************************************************************************/ static void gpio_irq_ack(struct irq_data *d) { - int type = irq_desc[d->irq].status & IRQ_TYPE_SENSE_MASK; + struct orion_gpio_chip *ochip = irq_data_get_irq_chip_data(d); + int type; + + type = irq_desc[d->irq].status & IRQ_TYPE_SENSE_MASK; if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) { - int pin = irq_to_gpio(d->irq); - writel(~(1 << (pin & 31)), GPIO_EDGE_CAUSE(pin)); + int pin = d->irq - ochip->secondary_irq_base; + + writel(~(1 << pin), GPIO_EDGE_CAUSE(ochip)); } } static void gpio_irq_mask(struct irq_data *d) { - int pin = irq_to_gpio(d->irq); - int type = irq_desc[d->irq].status & IRQ_TYPE_SENSE_MASK; - u32 reg = (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) ? - GPIO_EDGE_MASK(pin) : GPIO_LEVEL_MASK(pin); - u32 u = readl(reg); - u &= ~(1 << (pin & 31)); - writel(u, reg); + struct orion_gpio_chip *ochip = irq_data_get_irq_chip_data(d); + int type; + void __iomem *reg; + int pin; + + type = irq_desc[d->irq].status & IRQ_TYPE_SENSE_MASK; + if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) + reg = GPIO_EDGE_MASK(ochip); + else + reg = GPIO_LEVEL_MASK(ochip); + + pin = d->irq - ochip->secondary_irq_base; + + writel(readl(reg) & ~(1 << pin), reg); } static void gpio_irq_unmask(struct irq_data *d) { - int pin = irq_to_gpio(d->irq); - int type = irq_desc[d->irq].status & IRQ_TYPE_SENSE_MASK; - u32 reg = (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) ? - GPIO_EDGE_MASK(pin) : GPIO_LEVEL_MASK(pin); - u32 u = readl(reg); - u |= 1 << (pin & 31); - writel(u, reg); + struct orion_gpio_chip *ochip = irq_data_get_irq_chip_data(d); + int type; + void __iomem *reg; + int pin; + + type = irq_desc[d->irq].status & IRQ_TYPE_SENSE_MASK; + if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) + reg = GPIO_EDGE_MASK(ochip); + else + reg = GPIO_LEVEL_MASK(ochip); + + pin = d->irq - ochip->secondary_irq_base; + + writel(readl(reg) | (1 << pin), reg); } static int gpio_irq_set_type(struct irq_data *d, u32 type) { - int pin = irq_to_gpio(d->irq); - struct irq_desc *desc; + struct orion_gpio_chip *ochip = irq_data_get_irq_chip_data(d); + int pin; u32 u; - u = readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31)); + pin = d->irq - ochip->secondary_irq_base; + + u = readl(GPIO_IO_CONF(ochip)) & (1 << pin); if (!u) { printk(KERN_ERR "orion gpio_irq_set_type failed " "(irq %d, pin %d).\n", d->irq, pin); return -EINVAL; } - desc = irq_desc + d->irq; - /* * Set edge/level type. */ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) { - desc->handle_irq = handle_edge_irq; + set_irq_handler(d->irq, handle_edge_irq); } else if (type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) { - desc->handle_irq = handle_level_irq; + set_irq_handler(d->irq, handle_level_irq); } else { - printk(KERN_ERR "failed to set irq=%d (type=%d)\n", d->irq, type); + printk(KERN_ERR "failed to set irq=%d (type=%d)\n", + d->irq, type); return -EINVAL; } @@ -294,31 +402,29 @@ static int gpio_irq_set_type(struct irq_data *d, u32 type) * Configure interrupt polarity. */ if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH) { - u = readl(GPIO_IN_POL(pin)); - u &= ~(1 << (pin & 31)); - writel(u, GPIO_IN_POL(pin)); + u = readl(GPIO_IN_POL(ochip)); + u &= ~(1 << pin); + writel(u, GPIO_IN_POL(ochip)); } else if (type == IRQ_TYPE_EDGE_FALLING || type == IRQ_TYPE_LEVEL_LOW) { - u = readl(GPIO_IN_POL(pin)); - u |= 1 << (pin & 31); - writel(u, GPIO_IN_POL(pin)); + u = readl(GPIO_IN_POL(ochip)); + u |= 1 << pin; + writel(u, GPIO_IN_POL(ochip)); } else if (type == IRQ_TYPE_EDGE_BOTH) { u32 v; - v = readl(GPIO_IN_POL(pin)) ^ readl(GPIO_DATA_IN(pin)); + v = readl(GPIO_IN_POL(ochip)) ^ readl(GPIO_DATA_IN(ochip)); /* * set initial polarity based on current input level */ - u = readl(GPIO_IN_POL(pin)); - if (v & (1 << (pin & 31))) - u |= 1 << (pin & 31); /* falling */ + u = readl(GPIO_IN_POL(ochip)); + if (v & (1 << pin)) + u |= 1 << pin; /* falling */ else - u &= ~(1 << (pin & 31)); /* rising */ - writel(u, GPIO_IN_POL(pin)); + u &= ~(1 << pin); /* rising */ + writel(u, GPIO_IN_POL(ochip)); } - desc->status = (desc->status & ~IRQ_TYPE_SENSE_MASK) | type; - return 0; } @@ -330,29 +436,87 @@ struct irq_chip orion_gpio_irq_chip = { .irq_set_type = gpio_irq_set_type, }; +void __init orion_gpio_init(int gpio_base, int ngpio, + u32 base, int mask_offset, int secondary_irq_base) +{ + struct orion_gpio_chip *ochip; + int i; + + if (orion_gpio_chip_count == ARRAY_SIZE(orion_gpio_chips)) + return; + + ochip = orion_gpio_chips + orion_gpio_chip_count; + ochip->chip.label = "orion_gpio"; + ochip->chip.request = orion_gpio_request; + ochip->chip.direction_input = orion_gpio_direction_input; + ochip->chip.get = orion_gpio_get; + ochip->chip.direction_output = orion_gpio_direction_output; + ochip->chip.set = orion_gpio_set; + ochip->chip.to_irq = orion_gpio_to_irq; + ochip->chip.base = gpio_base; + ochip->chip.ngpio = ngpio; + ochip->chip.can_sleep = 0; + spin_lock_init(&ochip->lock); + ochip->base = (void __iomem *)base; + ochip->valid_input = 0; + ochip->valid_output = 0; + ochip->mask_offset = mask_offset; + ochip->secondary_irq_base = secondary_irq_base; + + gpiochip_add(&ochip->chip); + + orion_gpio_chip_count++; + + /* + * Mask and clear GPIO interrupts. + */ + writel(0, GPIO_EDGE_CAUSE(ochip)); + writel(0, GPIO_EDGE_MASK(ochip)); + writel(0, GPIO_LEVEL_MASK(ochip)); + + for (i = 0; i < ngpio; i++) { + unsigned int irq = secondary_irq_base + i; + + set_irq_chip(irq, &orion_gpio_irq_chip); + set_irq_handler(irq, handle_level_irq); + set_irq_chip_data(irq, ochip); + irq_desc[irq].status |= IRQ_LEVEL; + set_irq_flags(irq, IRQF_VALID); + } +} + void orion_gpio_irq_handler(int pinoff) { + struct orion_gpio_chip *ochip; u32 cause; - int pin; + int i; - cause = readl(GPIO_DATA_IN(pinoff)) & readl(GPIO_LEVEL_MASK(pinoff)); - cause |= readl(GPIO_EDGE_CAUSE(pinoff)) & readl(GPIO_EDGE_MASK(pinoff)); + ochip = orion_gpio_chip_find(pinoff); + if (ochip == NULL) + return; - for (pin = pinoff; pin < pinoff + 8; pin++) { - int irq = gpio_to_irq(pin); - struct irq_desc *desc = irq_desc + irq; + cause = readl(GPIO_DATA_IN(ochip)) & readl(GPIO_LEVEL_MASK(ochip)); + cause |= readl(GPIO_EDGE_CAUSE(ochip)) & readl(GPIO_EDGE_MASK(ochip)); - if (!(cause & (1 << (pin & 31)))) + for (i = 0; i < ochip->chip.ngpio; i++) { + int irq; + struct irq_desc *desc; + + irq = ochip->secondary_irq_base + i; + + if (!(cause & (1 << i))) continue; + desc = irq_desc + irq; if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) { /* Swap polarity (race with GPIO line) */ u32 polarity; - polarity = readl(GPIO_IN_POL(pin)); - polarity ^= 1 << (pin & 31); - writel(polarity, GPIO_IN_POL(pin)); + polarity = readl(GPIO_IN_POL(ochip)); + polarity ^= 1 << i; + writel(polarity, GPIO_IN_POL(ochip)); } + desc_handle_irq(irq, desc); } } |