/* * driver/mfd/asic3.c * * Compaq ASIC3 support. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Copyright 2001 Compaq Computer Corporation. * Copyright 2004-2005 Phil Blundell * Copyright 2007-2008 OpenedHand Ltd. * * Authors: Phil Blundell <pb@handhelds.org>, * Samuel Ortiz <sameo@openedhand.com> * */ #include <linux/version.h> #include <linux/kernel.h> #include <linux/irq.h> #include <linux/gpio.h> #include <linux/io.h> #include <linux/spinlock.h> #include <linux/platform_device.h> #include <linux/mfd/asic3.h> struct asic3 { void __iomem *mapping; unsigned int bus_shift; unsigned int irq_nr; unsigned int irq_base; spinlock_t lock; u16 irq_bothedge[4]; struct gpio_chip gpio; struct device *dev; }; static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset); static inline void asic3_write_register(struct asic3 *asic, unsigned int reg, u32 value) { iowrite16(value, asic->mapping + (reg >> asic->bus_shift)); } static inline u32 asic3_read_register(struct asic3 *asic, unsigned int reg) { return ioread16(asic->mapping + (reg >> asic->bus_shift)); } /* IRQs */ #define MAX_ASIC_ISR_LOOPS 20 #define ASIC3_GPIO_BASE_INCR \ (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE) static void asic3_irq_flip_edge(struct asic3 *asic, u32 base, int bit) { u16 edge; unsigned long flags; spin_lock_irqsave(&asic->lock, flags); edge = asic3_read_register(asic, base + ASIC3_GPIO_EDGE_TRIGGER); edge ^= bit; asic3_write_register(asic, base + ASIC3_GPIO_EDGE_TRIGGER, edge); spin_unlock_irqrestore(&asic->lock, flags); } static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc) { int iter, i; unsigned long flags; struct asic3 *asic; desc->chip->ack(irq); asic = desc->handler_data; for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) { u32 status; int bank; spin_lock_irqsave(&asic->lock, flags); status = asic3_read_register(asic, ASIC3_OFFSET(INTR, P_INT_STAT)); spin_unlock_irqrestore(&asic->lock, flags); /* Check all ten register bits */ if ((status & 0x3ff) == 0) break; /* Handle GPIO IRQs */ for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) { if (status & (1 << bank)) { unsigned long base, istat; base = ASIC3_GPIO_A_BASE + bank * ASIC3_GPIO_BASE_INCR; spin_lock_irqsave(&asic->lock, flags); istat = asic3_read_register(asic, base + ASIC3_GPIO_INT_STATUS); /* Clearing IntStatus */ asic3_write_register(asic, base + ASIC3_GPIO_INT_STATUS, 0); spin_unlock_irqrestore(&asic->lock, flags); for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) { int bit = (1 << i); unsigned int irqnr; if (!(istat & bit)) continue; irqnr = asic->irq_base + (ASIC3_GPIOS_PER_BANK * bank) + i; desc = irq_desc + irqnr; desc->handle_irq(irqnr, desc); if (asic->irq_bothedge[bank] & bit) asic3_irq_flip_edge(asic, base, bit); } } } /* Handle remaining IRQs in the status register */ for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) { /* They start at bit 4 and go up */ if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) { desc = irq_desc + asic->irq_base + i; desc->handle_irq(asic->irq_base + i, desc); } } } if (iter >= MAX_ASIC_ISR_LOOPS) dev_err(asic->dev, "interrupt processing overrun\n"); } static inline int asic3_irq_to_bank(struct asic3 *asic, int irq) { int n; n = (irq - asic->irq_base) >> 4; return (n * (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE)); } static inline int asic3_irq_to_index(struct asic3 *asic, int irq) { return (irq - asic->irq_base) & 0xf; } static void asic3_mask_gpio_irq(unsigned int irq) { struct asic3 *asic = get_irq_chip_data(irq); u32 val, bank, index; unsigned long flags; bank = asic3_irq_to_bank(asic, irq); index = asic3_irq_to_index(asic, irq); spin_lock_irqsave(&asic->lock, flags); val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK); val |= 1 << index; asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val); spin_unlock_irqrestore(&asic->lock, flags); } static void asic3_mask_irq(unsigned int irq) { struct asic3 *asic = get_irq_chip_data(irq); int regval; unsigned long flags; spin_lock_irqsave(&asic->lock, flags); regval = asic3_read_register(asic, ASIC3_INTR_BASE + ASIC3_INTR_INT_MASK); regval &= ~(ASIC3_INTMASK_MASK0 << (irq - (asic->irq_base + ASIC3_NUM_GPIOS))); asic3_write_register(asic, ASIC3_INTR_BASE + ASIC3_INTR_INT_MASK, regval); spin_unlock_irqrestore(&asic->lock, flags); } static void asic3_unmask_gpio_irq(unsigned int irq) { struct asic3 *asic = get_irq_chip_data(irq); u32 val, bank, index; unsigned long flags; bank = asic3_irq_to_bank(asic, irq); index = asic3_irq_to_index(asic, irq); spin_lock_irqsave(&asic->lock, flags); val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK); val &= ~(1 << index); asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val); spin_unlock_irqrestore(&asic->lock, flags); } static void asic3_unmask_irq(unsigned int irq) { struct asic3 *asic = get_irq_chip_data(irq); int regval; unsigned long flags; spin_lock_irqsave(&asic->lock, flags); regval = asic3_read_register(asic, ASIC3_INTR_BASE + ASIC3_INTR_INT_MASK); regval |= (ASIC3_INTMASK_MASK0 << (irq - (asic->irq_base + ASIC3_NUM_GPIOS))); asic3_write_register(asic, ASIC3_INTR_BASE + ASIC3_INTR_INT_MASK, regval); spin_unlock_irqrestore(&asic->lock, flags); } static int asic3_gpio_irq_type(unsigned int irq, unsigned int type) { struct asic3 *asic = get_irq_chip_data(irq); u32 bank, index; u16 trigger, level, edge, bit; unsigned long flags; bank = asic3_irq_to_bank(asic, irq); index = asic3_irq_to_index(asic, irq); bit = 1<<index; spin_lock_irqsave(&asic->lock, flags); level = asic3_read_register(asic, bank + ASIC3_GPIO_LEVEL_TRIGGER); edge = asic3_read_register(asic, bank + ASIC3_GPIO_EDGE_TRIGGER); trigger = asic3_read_register(asic, bank + ASIC3_GPIO_TRIGGER_TYPE); asic->irq_bothedge[(irq - asic->irq_base) >> 4] &= ~bit; if (type == IRQT_RISING) { trigger |= bit; edge |= bit; } else if (type == IRQT_FALLING) { trigger |= bit; edge &= ~bit; } else if (type == IRQT_BOTHEDGE) { trigger |= bit; if (asic3_gpio_get(&asic->gpio, irq - asic->irq_base)) edge &= ~bit; else edge |= bit; asic->irq_bothedge[(irq - asic->irq_base) >> 4] |= bit; } else if (type == IRQT_LOW) { trigger &= ~bit; level &= ~bit; } else if (type == IRQT_HIGH) { trigger &= ~bit; level |= bit; } else { /* * if type == IRQT_NOEDGE, we should mask interrupts, but * be careful to not unmask them if mask was also called. * Probably need internal state for mask. */ dev_notice(asic->dev, "irq type not changed\n"); } asic3_write_register(asic, bank + ASIC3_GPIO_LEVEL_TRIGGER, level); asic3_write_register(asic, bank + ASIC3_GPIO_EDGE_TRIGGER, edge); asic3_write_register(asic, bank + ASIC3_GPIO_TRIGGER_TYPE, trigger); spin_unlock_irqrestore(&asic->lock, flags); return 0; } static struct irq_chip asic3_gpio_irq_chip = { .name = "ASIC3-GPIO", .ack = asic3_mask_gpio_irq, .mask = asic3_mask_gpio_irq, .unmask = asic3_unmask_gpio_irq, .set_type = asic3_gpio_irq_type, }; static struct irq_chip asic3_irq_chip = { .name = "ASIC3", .ack = asic3_mask_irq, .mask = asic3_mask_irq, .unmask = asic3_unmask_irq, }; static int __init asic3_irq_probe(struct platform_device *pdev) { struct asic3 *asic = platform_get_drvdata(pdev); unsigned long clksel = 0; unsigned int irq, irq_base; int map_size; asic->irq_nr = platform_get_irq(pdev, 0); if (asic->irq_nr < 0) return asic->irq_nr; /* turn on clock to IRQ controller */ clksel |= CLOCK_SEL_CX; asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel); irq_base = asic->irq_base; for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) { if (irq < asic->irq_base + ASIC3_NUM_GPIOS) set_irq_chip(irq, &asic3_gpio_irq_chip); else set_irq_chip(irq, &asic3_irq_chip); set_irq_chip_data(irq, asic); set_irq_handler(irq, handle_level_irq); set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); } asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK), ASIC3_INTMASK_GINTMASK); set_irq_chained_handler(asic->irq_nr, asic3_irq_demux); set_irq_type(asic->irq_nr, IRQT_RISING); set_irq_data(asic->irq_nr, asic); return 0; } static void asic3_irq_remove(struct platform_device *pdev) { struct asic3 *asic = platform_get_drvdata(pdev); unsigned int irq, irq_base; irq_base = asic->irq_base; for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) { set_irq_flags(irq, 0); set_irq_handler(irq, NULL); set_irq_chip(irq, NULL); set_irq_chip_data(irq, NULL); } set_irq_chained_handler(asic->irq_nr, NULL); } /* GPIOs */ static int asic3_gpio_direction(struct gpio_chip *chip, unsigned offset, int out) { u32 mask = ASIC3_GPIO_TO_MASK(offset), out_reg; unsigned int gpio_base; unsigned long flags; struct asic3 *asic; asic = container_of(chip, struct asic3, gpio); gpio_base = ASIC3_GPIO_TO_BASE(offset); if (gpio_base > ASIC3_GPIO_D_BASE) { dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n", gpio_base, offset); return -EINVAL; } spin_lock_irqsave(&asic->lock, flags); out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_DIRECTION); /* Input is 0, Output is 1 */ if (out) out_reg |= mask; else out_reg &= ~mask; asic3_write_register(asic, gpio_base + ASIC3_GPIO_DIRECTION, out_reg); spin_unlock_irqrestore(&asic->lock, flags); return 0; } static int asic3_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { return asic3_gpio_direction(chip, offset, 0); } static int asic3_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) { return asic3_gpio_direction(chip, offset, 1); } static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset) { unsigned int gpio_base; u32 mask = ASIC3_GPIO_TO_MASK(offset); struct asic3 *asic; asic = container_of(chip, struct asic3, gpio); gpio_base = ASIC3_GPIO_TO_BASE(offset); if (gpio_base > ASIC3_GPIO_D_BASE) { dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n", gpio_base, offset); return -EINVAL; } return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask; } static void asic3_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { u32 mask, out_reg; unsigned int gpio_base; unsigned long flags; struct asic3 *asic; asic = container_of(chip, struct asic3, gpio); gpio_base = ASIC3_GPIO_TO_BASE(offset); if (gpio_base > ASIC3_GPIO_D_BASE) { dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n", gpio_base, offset); return; } mask = ASIC3_GPIO_TO_MASK(offset); spin_lock_irqsave(&asic->lock, flags); out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_OUT); if (value) out_reg |= mask; else out_reg &= ~mask; asic3_write_register(asic, gpio_base + ASIC3_GPIO_OUT, out_reg); spin_unlock_irqrestore(&asic->lock, flags); return; } static __init int asic3_gpio_probe(struct platform_device *pdev, u16 *gpio_config, int num) { struct asic3 *asic = platform_get_drvdata(pdev); u16 alt_reg[ASIC3_NUM_GPIO_BANKS]; u16 out_reg[ASIC3_NUM_GPIO_BANKS]; u16 dir_reg[ASIC3_NUM_GPIO_BANKS]; int i; memzero(alt_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16)); memzero(out_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16)); memzero(dir_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16)); /* Enable all GPIOs */ asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, MASK), 0xffff); asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, MASK), 0xffff); asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, MASK), 0xffff); asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, MASK), 0xffff); for (i = 0; i < num; i++) { u8 alt, pin, dir, init, bank_num, bit_num; u16 config = gpio_config[i]; pin = ASIC3_CONFIG_GPIO_PIN(config); alt = ASIC3_CONFIG_GPIO_ALT(config); dir = ASIC3_CONFIG_GPIO_DIR(config); init = ASIC3_CONFIG_GPIO_INIT(config); bank_num = ASIC3_GPIO_TO_BANK(pin); bit_num = ASIC3_GPIO_TO_BIT(pin); alt_reg[bank_num] |= (alt << bit_num); out_reg[bank_num] |= (init << bit_num); dir_reg[bank_num] |= (dir << bit_num); } for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) { asic3_write_register(asic, ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_DIRECTION, dir_reg[i]); asic3_write_register(asic, ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_OUT, out_reg[i]); asic3_write_register(asic, ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_ALT_FUNCTION, alt_reg[i]); } return gpiochip_add(&asic->gpio); } static int asic3_gpio_remove(struct platform_device *pdev) { struct asic3 *asic = platform_get_drvdata(pdev); return gpiochip_remove(&asic->gpio); } /* Core */ static int __init asic3_probe(struct platform_device *pdev) { struct asic3_platform_data *pdata = pdev->dev.platform_data; struct asic3 *asic; struct resource *mem; unsigned long clksel; int ret = 0; asic = kzalloc(sizeof(struct asic3), GFP_KERNEL); if (asic == NULL) { printk(KERN_ERR "kzalloc failed\n"); return -ENOMEM; } spin_lock_init(&asic->lock); platform_set_drvdata(pdev, asic); asic->dev = &pdev->dev; mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!mem) { ret = -ENOMEM; dev_err(asic->dev, "no MEM resource\n"); goto out_free; } map_size = mem->end - mem->start + 1; asic->mapping = ioremap(mem->start, map_size); if (!asic->mapping) { ret = -ENOMEM; dev_err(asic->dev, "Couldn't ioremap\n"); goto out_free; } asic->irq_base = pdata->irq_base; /* calculate bus shift from mem resource */ asic->bus_shift = 2 - (map_size >> 12); clksel = 0; asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel); ret = asic3_irq_probe(pdev); if (ret < 0) { dev_err(asic->dev, "Couldn't probe IRQs\n"); goto out_unmap; } asic->gpio.base = pdata->gpio_base; asic->gpio.ngpio = ASIC3_NUM_GPIOS; asic->gpio.get = asic3_gpio_get; asic->gpio.set = asic3_gpio_set; asic->gpio.direction_input = asic3_gpio_direction_input; asic->gpio.direction_output = asic3_gpio_direction_output; ret = asic3_gpio_probe(pdev, pdata->gpio_config, pdata->gpio_config_num); if (ret < 0) { dev_err(asic->dev, "GPIO probe failed\n"); goto out_irq; } dev_info(asic->dev, "ASIC3 Core driver\n"); return 0; out_irq: asic3_irq_remove(pdev); out_unmap: iounmap(asic->mapping); out_free: kfree(asic); return ret; } static int asic3_remove(struct platform_device *pdev) { int ret; struct asic3 *asic = platform_get_drvdata(pdev); ret = asic3_gpio_remove(pdev); if (ret < 0) return ret; asic3_irq_remove(pdev); asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0); iounmap(asic->mapping); kfree(asic); return 0; } static void asic3_shutdown(struct platform_device *pdev) { } static struct platform_driver asic3_device_driver = { .driver = { .name = "asic3", }, .remove = __devexit_p(asic3_remove), .shutdown = asic3_shutdown, }; static int __init asic3_init(void) { int retval = 0; retval = platform_driver_probe(&asic3_device_driver, asic3_probe); return retval; } subsys_initcall(asic3_init);