diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/gpio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/gpio/gpio-mpc8xxx.c | 395 |
3 files changed, 404 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index d539efd96d4b..4744cf246d4a 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -103,6 +103,14 @@ config GPIO_MPC5200 def_bool y depends on PPC_MPC52xx +config GPIO_MPC8XXX + bool "MPC512x/MPC8xxx GPIO support" + depends on PPC_MPC512x || PPC_MPC831x || PPC_MPC834x || PPC_MPC837x || \ + FSL_SOC_BOOKE || PPC_86xx + help + Say Y here if you're going to use hardware that connects to the + MPC512x/831x/834x/837x/8572/8610 GPIOs. + config GPIO_MSM_V1 tristate "Qualcomm MSM GPIO v1" depends on GPIOLIB && ARCH_MSM diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 9588948c96f0..828bba9883c3 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o obj-$(CONFIG_GPIO_MCP23S08) += gpio-mcp23s08.o obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o obj-$(CONFIG_GPIO_MPC5200) += gpio-mpc5200.o +obj-$(CONFIG_GPIO_MPC8XXX) += gpio-mpc8xxx.o obj-$(CONFIG_GPIO_MSM_V1) += gpio-msm-v1.o obj-$(CONFIG_GPIO_MSM_V2) += gpio-msm-v2.o obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c new file mode 100644 index 000000000000..fb4963abdf55 --- /dev/null +++ b/drivers/gpio/gpio-mpc8xxx.c @@ -0,0 +1,395 @@ +/* + * GPIOs on MPC512x/8349/8572/8610 and compatible + * + * Copyright (C) 2008 Peter Korsgaard <jacmet@sunsite.dk> + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <linux/gpio.h> +#include <linux/slab.h> +#include <linux/irq.h> + +#define MPC8XXX_GPIO_PINS 32 + +#define GPIO_DIR 0x00 +#define GPIO_ODR 0x04 +#define GPIO_DAT 0x08 +#define GPIO_IER 0x0c +#define GPIO_IMR 0x10 +#define GPIO_ICR 0x14 +#define GPIO_ICR2 0x18 + +struct mpc8xxx_gpio_chip { + struct of_mm_gpio_chip mm_gc; + spinlock_t lock; + + /* + * shadowed data register to be able to clear/set output pins in + * open drain mode safely + */ + u32 data; + struct irq_host *irq; + void *of_dev_id_data; +}; + +static inline u32 mpc8xxx_gpio2mask(unsigned int gpio) +{ + return 1u << (MPC8XXX_GPIO_PINS - 1 - gpio); +} + +static inline struct mpc8xxx_gpio_chip * +to_mpc8xxx_gpio_chip(struct of_mm_gpio_chip *mm) +{ + return container_of(mm, struct mpc8xxx_gpio_chip, mm_gc); +} + +static void mpc8xxx_gpio_save_regs(struct of_mm_gpio_chip *mm) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm); + + mpc8xxx_gc->data = in_be32(mm->regs + GPIO_DAT); +} + +/* Workaround GPIO 1 errata on MPC8572/MPC8536. The status of GPIOs + * defined as output cannot be determined by reading GPDAT register, + * so we use shadow data register instead. The status of input pins + * is determined by reading GPDAT register. + */ +static int mpc8572_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + u32 val; + struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); + struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm); + + val = in_be32(mm->regs + GPIO_DAT) & ~in_be32(mm->regs + GPIO_DIR); + + return (val | mpc8xxx_gc->data) & mpc8xxx_gpio2mask(gpio); +} + +static int mpc8xxx_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); + + return in_be32(mm->regs + GPIO_DAT) & mpc8xxx_gpio2mask(gpio); +} + +static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); + struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm); + unsigned long flags; + + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + + if (val) + mpc8xxx_gc->data |= mpc8xxx_gpio2mask(gpio); + else + mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(gpio); + + out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data); + + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); +} + +static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); + struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm); + unsigned long flags; + + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + + clrbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio)); + + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); + + return 0; +} + +static int mpc8xxx_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); + struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm); + unsigned long flags; + + mpc8xxx_gpio_set(gc, gpio, val); + + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + + setbits32(mm->regs + GPIO_DIR, mpc8xxx_gpio2mask(gpio)); + + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); + + return 0; +} + +static int mpc8xxx_gpio_to_irq(struct gpio_chip *gc, unsigned offset) +{ + struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc); + struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm); + + if (mpc8xxx_gc->irq && offset < MPC8XXX_GPIO_PINS) + return irq_create_mapping(mpc8xxx_gc->irq, offset); + else + return -ENXIO; +} + +static void mpc8xxx_gpio_irq_cascade(unsigned int irq, struct irq_desc *desc) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_desc_get_handler_data(desc); + struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc; + unsigned int mask; + + mask = in_be32(mm->regs + GPIO_IER) & in_be32(mm->regs + GPIO_IMR); + if (mask) + generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq, + 32 - ffs(mask))); +} + +static void mpc8xxx_irq_unmask(struct irq_data *d) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d); + struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc; + unsigned long flags; + + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + + setbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d))); + + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); +} + +static void mpc8xxx_irq_mask(struct irq_data *d) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d); + struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc; + unsigned long flags; + + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + + clrbits32(mm->regs + GPIO_IMR, mpc8xxx_gpio2mask(irqd_to_hwirq(d))); + + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); +} + +static void mpc8xxx_irq_ack(struct irq_data *d) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d); + struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc; + + out_be32(mm->regs + GPIO_IER, mpc8xxx_gpio2mask(irqd_to_hwirq(d))); +} + +static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d); + struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc; + unsigned long flags; + + switch (flow_type) { + case IRQ_TYPE_EDGE_FALLING: + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + setbits32(mm->regs + GPIO_ICR, + mpc8xxx_gpio2mask(irqd_to_hwirq(d))); + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); + break; + + case IRQ_TYPE_EDGE_BOTH: + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + clrbits32(mm->regs + GPIO_ICR, + mpc8xxx_gpio2mask(irqd_to_hwirq(d))); + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int mpc512x_irq_set_type(struct irq_data *d, unsigned int flow_type) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = irq_data_get_irq_chip_data(d); + struct of_mm_gpio_chip *mm = &mpc8xxx_gc->mm_gc; + unsigned long gpio = irqd_to_hwirq(d); + void __iomem *reg; + unsigned int shift; + unsigned long flags; + + if (gpio < 16) { + reg = mm->regs + GPIO_ICR; + shift = (15 - gpio) * 2; + } else { + reg = mm->regs + GPIO_ICR2; + shift = (15 - (gpio % 16)) * 2; + } + + switch (flow_type) { + case IRQ_TYPE_EDGE_FALLING: + case IRQ_TYPE_LEVEL_LOW: + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + clrsetbits_be32(reg, 3 << shift, 2 << shift); + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); + break; + + case IRQ_TYPE_EDGE_RISING: + case IRQ_TYPE_LEVEL_HIGH: + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + clrsetbits_be32(reg, 3 << shift, 1 << shift); + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); + break; + + case IRQ_TYPE_EDGE_BOTH: + spin_lock_irqsave(&mpc8xxx_gc->lock, flags); + clrbits32(reg, 3 << shift); + spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags); + break; + + default: + return -EINVAL; + } + + return 0; +} + +static struct irq_chip mpc8xxx_irq_chip = { + .name = "mpc8xxx-gpio", + .irq_unmask = mpc8xxx_irq_unmask, + .irq_mask = mpc8xxx_irq_mask, + .irq_ack = mpc8xxx_irq_ack, + .irq_set_type = mpc8xxx_irq_set_type, +}; + +static int mpc8xxx_gpio_irq_map(struct irq_host *h, unsigned int virq, + irq_hw_number_t hw) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = h->host_data; + + if (mpc8xxx_gc->of_dev_id_data) + mpc8xxx_irq_chip.irq_set_type = mpc8xxx_gc->of_dev_id_data; + + irq_set_chip_data(virq, h->host_data); + irq_set_chip_and_handler(virq, &mpc8xxx_irq_chip, handle_level_irq); + irq_set_irq_type(virq, IRQ_TYPE_NONE); + + return 0; +} + +static int mpc8xxx_gpio_irq_xlate(struct irq_host *h, struct device_node *ct, + const u32 *intspec, unsigned int intsize, + irq_hw_number_t *out_hwirq, + unsigned int *out_flags) + +{ + /* interrupt sense values coming from the device tree equal either + * EDGE_FALLING or EDGE_BOTH + */ + *out_hwirq = intspec[0]; + *out_flags = intspec[1]; + + return 0; +} + +static struct irq_host_ops mpc8xxx_gpio_irq_ops = { + .map = mpc8xxx_gpio_irq_map, + .xlate = mpc8xxx_gpio_irq_xlate, +}; + +static struct of_device_id mpc8xxx_gpio_ids[] __initdata = { + { .compatible = "fsl,mpc8349-gpio", }, + { .compatible = "fsl,mpc8572-gpio", }, + { .compatible = "fsl,mpc8610-gpio", }, + { .compatible = "fsl,mpc5121-gpio", .data = mpc512x_irq_set_type, }, + { .compatible = "fsl,qoriq-gpio", }, + {} +}; + +static void __init mpc8xxx_add_controller(struct device_node *np) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc; + struct of_mm_gpio_chip *mm_gc; + struct gpio_chip *gc; + const struct of_device_id *id; + unsigned hwirq; + int ret; + + mpc8xxx_gc = kzalloc(sizeof(*mpc8xxx_gc), GFP_KERNEL); + if (!mpc8xxx_gc) { + ret = -ENOMEM; + goto err; + } + + spin_lock_init(&mpc8xxx_gc->lock); + + mm_gc = &mpc8xxx_gc->mm_gc; + gc = &mm_gc->gc; + + mm_gc->save_regs = mpc8xxx_gpio_save_regs; + gc->ngpio = MPC8XXX_GPIO_PINS; + gc->direction_input = mpc8xxx_gpio_dir_in; + gc->direction_output = mpc8xxx_gpio_dir_out; + if (of_device_is_compatible(np, "fsl,mpc8572-gpio")) + gc->get = mpc8572_gpio_get; + else + gc->get = mpc8xxx_gpio_get; + gc->set = mpc8xxx_gpio_set; + gc->to_irq = mpc8xxx_gpio_to_irq; + + ret = of_mm_gpiochip_add(np, mm_gc); + if (ret) + goto err; + + hwirq = irq_of_parse_and_map(np, 0); + if (hwirq == NO_IRQ) + goto skip_irq; + + mpc8xxx_gc->irq = + irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, MPC8XXX_GPIO_PINS, + &mpc8xxx_gpio_irq_ops, MPC8XXX_GPIO_PINS); + if (!mpc8xxx_gc->irq) + goto skip_irq; + + id = of_match_node(mpc8xxx_gpio_ids, np); + if (id) + mpc8xxx_gc->of_dev_id_data = id->data; + + mpc8xxx_gc->irq->host_data = mpc8xxx_gc; + + /* ack and mask all irqs */ + out_be32(mm_gc->regs + GPIO_IER, 0xffffffff); + out_be32(mm_gc->regs + GPIO_IMR, 0); + + irq_set_handler_data(hwirq, mpc8xxx_gc); + irq_set_chained_handler(hwirq, mpc8xxx_gpio_irq_cascade); + +skip_irq: + return; + +err: + pr_err("%s: registration failed with status %d\n", + np->full_name, ret); + kfree(mpc8xxx_gc); + + return; +} + +static int __init mpc8xxx_add_gpiochips(void) +{ + struct device_node *np; + + for_each_matching_node(np, mpc8xxx_gpio_ids) + mpc8xxx_add_controller(np); + + return 0; +} +arch_initcall(mpc8xxx_add_gpiochips); |