// SPDX-License-Identifier: GPL-2.0-only /* * linux/arch/arm/mach-sa1100/gpio.c * * Generic SA-1100 GPIO handling */ #include #include #include #include #include #include #include #include struct sa1100_gpio_chip { struct gpio_chip chip; void __iomem *membase; int irqbase; u32 irqmask; u32 irqrising; u32 irqfalling; u32 irqwake; }; #define sa1100_gpio_chip(x) container_of(x, struct sa1100_gpio_chip, chip) enum { R_GPLR = 0x00, R_GPDR = 0x04, R_GPSR = 0x08, R_GPCR = 0x0c, R_GRER = 0x10, R_GFER = 0x14, R_GEDR = 0x18, R_GAFR = 0x1c, }; static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset) { return readl_relaxed(sa1100_gpio_chip(chip)->membase + R_GPLR) & BIT(offset); } static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { int reg = value ? R_GPSR : R_GPCR; writel_relaxed(BIT(offset), sa1100_gpio_chip(chip)->membase + reg); } static int sa1100_get_direction(struct gpio_chip *chip, unsigned offset) { void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR; return !(readl_relaxed(gpdr) & BIT(offset)); } static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset) { void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR; unsigned long flags; local_irq_save(flags); writel_relaxed(readl_relaxed(gpdr) & ~BIT(offset), gpdr); local_irq_restore(flags); return 0; } static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value) { void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR; unsigned long flags; local_irq_save(flags); sa1100_gpio_set(chip, offset, value); writel_relaxed(readl_relaxed(gpdr) | BIT(offset), gpdr); local_irq_restore(flags); return 0; } static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset) { return sa1100_gpio_chip(chip)->irqbase + offset; } static struct sa1100_gpio_chip sa1100_gpio_chip = { .chip = { .label = "gpio", .get_direction = sa1100_get_direction, .direction_input = sa1100_direction_input, .direction_output = sa1100_direction_output, .set = sa1100_gpio_set, .get = sa1100_gpio_get, .to_irq = sa1100_to_irq, .base = 0, .ngpio = GPIO_MAX + 1, }, .membase = (void *)&GPLR, .irqbase = IRQ_GPIO0, }; /* * SA1100 GPIO edge detection for IRQs: * IRQs are generated on Falling-Edge, Rising-Edge, or both. * Use this instead of directly setting GRER/GFER. */ static void sa1100_update_edge_regs(struct sa1100_gpio_chip *sgc) { void *base = sgc->membase; u32 grer, gfer; grer = sgc->irqrising & sgc->irqmask; gfer = sgc->irqfalling & sgc->irqmask; writel_relaxed(grer, base + R_GRER); writel_relaxed(gfer, base + R_GFER); } static int sa1100_gpio_type(struct irq_data *d, unsigned int type) { struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d); unsigned int mask = BIT(d->hwirq); if (type == IRQ_TYPE_PROBE) { if ((sgc->irqrising | sgc->irqfalling) & mask) return 0; type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING; } if (type & IRQ_TYPE_EDGE_RISING) sgc->irqrising |= mask; else sgc->irqrising &= ~mask; if (type & IRQ_TYPE_EDGE_FALLING) sgc->irqfalling |= mask; else sgc->irqfalling &= ~mask; sa1100_update_edge_regs(sgc); return 0; } /* * GPIO IRQs must be acknowledged. */ static void sa1100_gpio_ack(struct irq_data *d) { struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d); writel_relaxed(BIT(d->hwirq), sgc->membase + R_GEDR); } static void sa1100_gpio_mask(struct irq_data *d) { struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d); unsigned int mask = BIT(d->hwirq); sgc->irqmask &= ~mask; sa1100_update_edge_regs(sgc); } static void sa1100_gpio_unmask(struct irq_data *d) { struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d); unsigned int mask = BIT(d->hwirq); sgc->irqmask |= mask; sa1100_update_edge_regs(sgc); } static int sa1100_gpio_wake(struct irq_data *d, unsigned int on) { struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d); int ret = sa11x0_gpio_set_wake(d->hwirq, on); if (!ret) { if (on) sgc->irqwake |= BIT(d->hwirq); else sgc->irqwake &= ~BIT(d->hwirq); } return ret; } /* * This is for GPIO IRQs */ static struct irq_chip sa1100_gpio_irq_chip = { .name = "GPIO", .irq_ack = sa1100_gpio_ack, .irq_mask = sa1100_gpio_mask, .irq_unmask = sa1100_gpio_unmask, .irq_set_type = sa1100_gpio_type, .irq_set_wake = sa1100_gpio_wake, }; static int sa1100_gpio_irqdomain_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hwirq) { struct sa1100_gpio_chip *sgc = d->host_data; irq_set_chip_data(irq, sgc); irq_set_chip_and_handler(irq, &sa1100_gpio_irq_chip, handle_edge_irq); irq_set_probe(irq); return 0; } static const struct irq_domain_ops sa1100_gpio_irqdomain_ops = { .map = sa1100_gpio_irqdomain_map, .xlate = irq_domain_xlate_onetwocell, }; static struct irq_domain *sa1100_gpio_irqdomain; /* * IRQ 0-11 (GPIO) handler. We enter here with the * irq_controller_lock held, and IRQs disabled. Decode the IRQ * and call the handler. */ static void sa1100_gpio_handler(struct irq_desc *desc) { struct sa1100_gpio_chip *sgc = irq_desc_get_handler_data(desc); unsigned int irq, mask; void __iomem *gedr = sgc->membase + R_GEDR; mask = readl_relaxed(gedr); do { /* * clear down all currently active IRQ sources. * We will be processing them all. */ writel_relaxed(mask, gedr); irq = sgc->irqbase; do { if (mask & 1) generic_handle_irq(irq); mask >>= 1; irq++; } while (mask); mask = readl_relaxed(gedr); } while (mask); } static int sa1100_gpio_suspend(void) { struct sa1100_gpio_chip *sgc = &sa1100_gpio_chip; /* * Set the appropriate edges for wakeup. */ writel_relaxed(sgc->irqwake & sgc->irqrising, sgc->membase + R_GRER); writel_relaxed(sgc->irqwake & sgc->irqfalling, sgc->membase + R_GFER); /* * Clear any pending GPIO interrupts. */ writel_relaxed(readl_relaxed(sgc->membase + R_GEDR), sgc->membase + R_GEDR); return 0; } static void sa1100_gpio_resume(void) { sa1100_update_edge_regs(&sa1100_gpio_chip); } static struct syscore_ops sa1100_gpio_syscore_ops = { .suspend = sa1100_gpio_suspend, .resume = sa1100_gpio_resume, }; static int __init sa1100_gpio_init_devicefs(void) { register_syscore_ops(&sa1100_gpio_syscore_ops); return 0; } device_initcall(sa1100_gpio_init_devicefs); static const int sa1100_gpio_irqs[] __initconst = { /* Install handlers for GPIO 0-10 edge detect interrupts */ IRQ_GPIO0_SC, IRQ_GPIO1_SC, IRQ_GPIO2_SC, IRQ_GPIO3_SC, IRQ_GPIO4_SC, IRQ_GPIO5_SC, IRQ_GPIO6_SC, IRQ_GPIO7_SC, IRQ_GPIO8_SC, IRQ_GPIO9_SC, IRQ_GPIO10_SC, /* Install handler for GPIO 11-27 edge detect interrupts */ IRQ_GPIO11_27, }; void __init sa1100_init_gpio(void) { struct sa1100_gpio_chip *sgc = &sa1100_gpio_chip; int i; /* clear all GPIO edge detects */ writel_relaxed(0, sgc->membase + R_GFER); writel_relaxed(0, sgc->membase + R_GRER); writel_relaxed(-1, sgc->membase + R_GEDR); gpiochip_add_data(&sa1100_gpio_chip.chip, NULL); sa1100_gpio_irqdomain = irq_domain_add_simple(NULL, 28, IRQ_GPIO0, &sa1100_gpio_irqdomain_ops, sgc); for (i = 0; i < ARRAY_SIZE(sa1100_gpio_irqs); i++) irq_set_chained_handler_and_data(sa1100_gpio_irqs[i], sa1100_gpio_handler, sgc); }