diff options
Diffstat (limited to 'drivers/mfd/asic3.c')
| -rw-r--r-- | drivers/mfd/asic3.c | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c new file mode 100644 index 0000000..63fb1ff3 --- /dev/null +++ b/drivers/mfd/asic3.c @@ -0,0 +1,588 @@ +/* + * 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 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/io.h> +#include <linux/spinlock.h> +#include <linux/platform_device.h> + +#include <linux/mfd/asic3.h> + +static inline void asic3_write_register(struct asic3 *asic, + unsigned int reg, u32 value) +{ + iowrite16(value, (unsigned long)asic->mapping + + (reg >> asic->bus_shift)); +} + +static inline u32 asic3_read_register(struct asic3 *asic, + unsigned int reg) +{ + return ioread16((unsigned long)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_EdgeTrigger); + edge ^= bit; + asic3_write_register(asic, + base + ASIC3_GPIO_EdgeTrigger, 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, PIntStat)); + 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_IntStatus); + /* Clearing IntStatus */ + asic3_write_register(asic, + base + + ASIC3_GPIO_IntStatus, 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 + + i; + desc->handle_irq(asic->irq_base + i, + desc); + } + } + } + + if (iter >= MAX_ASIC_ISR_LOOPS) + printk(KERN_ERR "%s: interrupt processing overrun\n", + __FUNCTION__); +} + +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_IntMask); + + regval &= ~(ASIC3_INTMASK_MASK0 << + (irq - (asic->irq_base + ASIC3_NUM_GPIOS))); + + asic3_write_register(asic, + ASIC3_INTR_Base + + ASIC3_INTR_IntMask, + 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_IntMask); + + regval |= (ASIC3_INTMASK_MASK0 << + (irq - (asic->irq_base + ASIC3_NUM_GPIOS))); + + asic3_write_register(asic, + ASIC3_INTR_Base + + ASIC3_INTR_IntMask, + 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_LevelTrigger); + edge = asic3_read_register(asic, + bank + ASIC3_GPIO_EdgeTrigger); + trigger = asic3_read_register(asic, + bank + ASIC3_GPIO_TriggerType); + 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_value(asic, 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. + */ + printk(KERN_NOTICE "asic3: irq type not changed.\n"); + } + asic3_write_register(asic, bank + ASIC3_GPIO_LevelTrigger, + level); + asic3_write_register(asic, bank + ASIC3_GPIO_EdgeTrigger, + edge); + asic3_write_register(asic, bank + ASIC3_GPIO_TriggerType, + 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 asic3_irq_probe(struct platform_device *pdev) +{ + struct asic3 *asic = platform_get_drvdata(pdev); + unsigned long clksel = 0; + unsigned int irq, irq_base; + + 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, IntMask), + 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 inline u32 asic3_get_gpio(struct asic3 *asic, unsigned int base, + unsigned int function) +{ + return asic3_read_register(asic, base + function); +} + +static void asic3_set_gpio(struct asic3 *asic, unsigned int base, + unsigned int function, u32 bits, u32 val) +{ + unsigned long flags; + + spin_lock_irqsave(&asic->lock, flags); + val |= (asic3_read_register(asic, base + function) & ~bits); + + asic3_write_register(asic, base + function, val); + spin_unlock_irqrestore(&asic->lock, flags); +} + +#define asic3_get_gpio_a(asic, fn) \ + asic3_get_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn) +#define asic3_get_gpio_b(asic, fn) \ + asic3_get_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn) +#define asic3_get_gpio_c(asic, fn) \ + asic3_get_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn) +#define asic3_get_gpio_d(asic, fn) \ + asic3_get_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn) + +#define asic3_set_gpio_a(asic, fn, bits, val) \ + asic3_set_gpio(asic, ASIC3_GPIO_A_Base, ASIC3_GPIO_##fn, bits, val) +#define asic3_set_gpio_b(asic, fn, bits, val) \ + asic3_set_gpio(asic, ASIC3_GPIO_B_Base, ASIC3_GPIO_##fn, bits, val) +#define asic3_set_gpio_c(asic, fn, bits, val) \ + asic3_set_gpio(asic, ASIC3_GPIO_C_Base, ASIC3_GPIO_##fn, bits, val) +#define asic3_set_gpio_d(asic, fn, bits, val) \ + asic3_set_gpio(asic, ASIC3_GPIO_D_Base, ASIC3_GPIO_##fn, bits, val) + +#define asic3_set_gpio_banks(asic, fn, bits, pdata, field) \ + do { \ + asic3_set_gpio_a((asic), fn, (bits), (pdata)->gpio_a.field); \ + asic3_set_gpio_b((asic), fn, (bits), (pdata)->gpio_b.field); \ + asic3_set_gpio_c((asic), fn, (bits), (pdata)->gpio_c.field); \ + asic3_set_gpio_d((asic), fn, (bits), (pdata)->gpio_d.field); \ + } while (0) + +int asic3_gpio_get_value(struct asic3 *asic, unsigned gpio) +{ + u32 mask = ASIC3_GPIO_bit(gpio); + + switch (gpio >> 4) { + case ASIC3_GPIO_BANK_A: + return asic3_get_gpio_a(asic, Status) & mask; + case ASIC3_GPIO_BANK_B: + return asic3_get_gpio_b(asic, Status) & mask; + case ASIC3_GPIO_BANK_C: + return asic3_get_gpio_c(asic, Status) & mask; + case ASIC3_GPIO_BANK_D: + return asic3_get_gpio_d(asic, Status) & mask; + default: + printk(KERN_ERR "%s: invalid GPIO value 0x%x", + __FUNCTION__, gpio); + return -EINVAL; + } +} +EXPORT_SYMBOL(asic3_gpio_get_value); + +void asic3_gpio_set_value(struct asic3 *asic, unsigned gpio, int val) +{ + u32 mask = ASIC3_GPIO_bit(gpio); + u32 bitval = 0; + if (val) + bitval = mask; + + switch (gpio >> 4) { + case ASIC3_GPIO_BANK_A: + asic3_set_gpio_a(asic, Out, mask, bitval); + return; + case ASIC3_GPIO_BANK_B: + asic3_set_gpio_b(asic, Out, mask, bitval); + return; + case ASIC3_GPIO_BANK_C: + asic3_set_gpio_c(asic, Out, mask, bitval); + return; + case ASIC3_GPIO_BANK_D: + asic3_set_gpio_d(asic, Out, mask, bitval); + return; + default: + printk(KERN_ERR "%s: invalid GPIO value 0x%x", + __FUNCTION__, gpio); + return; + } +} +EXPORT_SYMBOL(asic3_gpio_set_value); + +static int asic3_gpio_probe(struct platform_device *pdev) +{ + struct asic3_platform_data *pdata = pdev->dev.platform_data; + struct asic3 *asic = platform_get_drvdata(pdev); + + 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); + + asic3_set_gpio_a(asic, SleepMask, 0xffff, 0xffff); + asic3_set_gpio_b(asic, SleepMask, 0xffff, 0xffff); + asic3_set_gpio_c(asic, SleepMask, 0xffff, 0xffff); + asic3_set_gpio_d(asic, SleepMask, 0xffff, 0xffff); + + if (pdata) { + asic3_set_gpio_banks(asic, Out, 0xffff, pdata, init); + asic3_set_gpio_banks(asic, Direction, 0xffff, pdata, dir); + asic3_set_gpio_banks(asic, SleepMask, 0xffff, pdata, + sleep_mask); + asic3_set_gpio_banks(asic, SleepOut, 0xffff, pdata, sleep_out); + asic3_set_gpio_banks(asic, BattFaultOut, 0xffff, pdata, + batt_fault_out); + asic3_set_gpio_banks(asic, SleepConf, 0xffff, pdata, + sleep_conf); + asic3_set_gpio_banks(asic, AltFunction, 0xffff, pdata, + alt_function); + } + + return 0; +} + +static void asic3_gpio_remove(struct platform_device *pdev) +{ + return; +} + + +/* Core */ +static int 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; + + asic = kzalloc(sizeof(struct asic3), GFP_KERNEL); + if (!asic) + 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; + printk(KERN_ERR "asic3: no MEM resource\n"); + goto err_out_1; + } + + asic->mapping = ioremap(mem->start, PAGE_SIZE); + if (!asic->mapping) { + ret = -ENOMEM; + printk(KERN_ERR "asic3: couldn't ioremap\n"); + goto err_out_1; + } + + asic->irq_base = pdata->irq_base; + + if (pdata && pdata->bus_shift) + asic->bus_shift = 2 - pdata->bus_shift; + else + asic->bus_shift = 0; + + clksel = 0; + asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel); + + ret = asic3_irq_probe(pdev); + if (ret < 0) { + printk(KERN_ERR "asic3: couldn't probe IRQs\n"); + goto err_out_2; + } + asic3_gpio_probe(pdev); + + if (pdata->children) { + int i; + for (i = 0; i < pdata->n_children; i++) { + pdata->children[i]->dev.parent = &pdev->dev; + platform_device_register(pdata->children[i]); + } + } + + printk(KERN_INFO "ASIC3 Core driver\n"); + + return 0; + + err_out_2: + iounmap(asic->mapping); + err_out_1: + kfree(asic); + + return ret; +} + +static int asic3_remove(struct platform_device *pdev) +{ + struct asic3 *asic = platform_get_drvdata(pdev); + + asic3_gpio_remove(pdev); + 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", + }, + .probe = asic3_probe, + .remove = __devexit_p(asic3_remove), + .shutdown = asic3_shutdown, +}; + +static int __init asic3_init(void) +{ + int retval = 0; + retval = platform_driver_register(&asic3_device_driver); + return retval; +} + +subsys_initcall(asic3_init); |
