diff options
Diffstat (limited to 'arch/arm/plat-s5pc1xx/irq-eint.c')
| -rw-r--r-- | arch/arm/plat-s5pc1xx/irq-eint.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/arch/arm/plat-s5pc1xx/irq-eint.c b/arch/arm/plat-s5pc1xx/irq-eint.c new file mode 100644 index 000000000000..373122f57d56 --- /dev/null +++ b/arch/arm/plat-s5pc1xx/irq-eint.c @@ -0,0 +1,281 @@ +/* + * linux/arch/arm/plat-s5pc1xx/irq-eint.c + * + * Copyright 2009 Samsung Electronics Co. + * Byungho Min <bhmin@samsung.com> + * Kyungin Park <kyungmin.park@samsung.com> + * + * Based on plat-s3c64xx/irq-eint.c + * + * S5PC1XX - Interrupt handling for IRQ_EINT(x) + * + * 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. + */ + +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/sysdev.h> +#include <linux/pm.h> +#include <linux/gpio.h> + +#include <asm/hardware/vic.h> + +#include <mach/map.h> + +#include <plat/gpio-cfg.h> +#include <plat/gpio-ext.h> +#include <plat/pm.h> +#include <plat/regs-gpio.h> +#include <plat/regs-irqtype.h> + +/* + * bank is a group of external interrupt + * bank0 means EINT0 ... EINT7 + * bank1 means EINT8 ... EINT15 + * bank2 means EINT16 ... EINT23 + * bank3 means EINT24 ... EINT31 + */ + +static inline int s3c_get_eint(unsigned int irq) +{ + int real; + + if (irq < IRQ_EINT16_31) + real = (irq - IRQ_EINT0); + else + real = (irq - S3C_IRQ_EINT_BASE) + IRQ_EINT16_31 - IRQ_EINT0; + + return real; +} + +static inline int s3c_get_bank(unsigned int irq) +{ + return s3c_get_eint(irq) >> 3; +} + +static inline int s3c_eint_to_bit(unsigned int irq) +{ + int real, bit; + + real = s3c_get_eint(irq); + bit = 1 << (real & (8 - 1)); + + return bit; +} + +static inline void s3c_irq_eint_mask(unsigned int irq) +{ + u32 mask; + u32 bank = s3c_get_bank(irq); + + mask = __raw_readl(S5PC1XX_WKUP_INT_MASK(bank)); + mask |= s3c_eint_to_bit(irq); + __raw_writel(mask, S5PC1XX_WKUP_INT_MASK(bank)); +} + +static void s3c_irq_eint_unmask(unsigned int irq) +{ + u32 mask; + u32 bank = s3c_get_bank(irq); + + mask = __raw_readl(S5PC1XX_WKUP_INT_MASK(bank)); + mask &= ~(s3c_eint_to_bit(irq)); + __raw_writel(mask, S5PC1XX_WKUP_INT_MASK(bank)); +} + +static inline void s3c_irq_eint_ack(unsigned int irq) +{ + u32 bank = s3c_get_bank(irq); + + __raw_writel(s3c_eint_to_bit(irq), S5PC1XX_WKUP_INT_PEND(bank)); +} + +static void s3c_irq_eint_maskack(unsigned int irq) +{ + /* compiler should in-line these */ + s3c_irq_eint_mask(irq); + s3c_irq_eint_ack(irq); +} + +static int s3c_irq_eint_set_type(unsigned int irq, unsigned int type) +{ + u32 bank = s3c_get_bank(irq); + int real = s3c_get_eint(irq); + int gpio, shift, sfn; + u32 ctrl, con = 0; + + switch (type) { + case IRQ_TYPE_NONE: + printk(KERN_WARNING "No edge setting!\n"); + break; + + case IRQ_TYPE_EDGE_RISING: + con = S5PC1XX_WKUP_INT_RISEEDGE; + break; + + case IRQ_TYPE_EDGE_FALLING: + con = S5PC1XX_WKUP_INT_FALLEDGE; + break; + + case IRQ_TYPE_EDGE_BOTH: + con = S5PC1XX_WKUP_INT_BOTHEDGE; + break; + + case IRQ_TYPE_LEVEL_LOW: + con = S5PC1XX_WKUP_INT_LOWLEV; + break; + + case IRQ_TYPE_LEVEL_HIGH: + con = S5PC1XX_WKUP_INT_HILEV; + break; + + default: + printk(KERN_ERR "No such irq type %d", type); + return -EINVAL; + } + + gpio = real & (8 - 1); + shift = gpio << 2; + + ctrl = __raw_readl(S5PC1XX_WKUP_INT_CON(bank)); + ctrl &= ~(0x7 << shift); + ctrl |= con << shift; + __raw_writel(ctrl, S5PC1XX_WKUP_INT_CON(bank)); + + switch (real) { + case 0 ... 7: + gpio = S5PC100_GPH0(gpio); + break; + case 8 ... 15: + gpio = S5PC100_GPH1(gpio); + break; + case 16 ... 23: + gpio = S5PC100_GPH2(gpio); + break; + case 24 ... 31: + gpio = S5PC100_GPH3(gpio); + break; + default: + return -EINVAL; + } + + sfn = S3C_GPIO_SFN(0x2); + s3c_gpio_cfgpin(gpio, sfn); + + return 0; +} + +static struct irq_chip s3c_irq_eint = { + .name = "EINT", + .mask = s3c_irq_eint_mask, + .unmask = s3c_irq_eint_unmask, + .mask_ack = s3c_irq_eint_maskack, + .ack = s3c_irq_eint_ack, + .set_type = s3c_irq_eint_set_type, + .set_wake = s3c_irqext_wake, +}; + +/* s3c_irq_demux_eint + * + * This function demuxes the IRQ from external interrupts, + * from IRQ_EINT(16) to IRQ_EINT(31). It is designed to be inlined into + * the specific handlers s3c_irq_demux_eintX_Y. + */ +static inline void s3c_irq_demux_eint(unsigned int start, unsigned int end) +{ + u32 status = __raw_readl(S5PC1XX_WKUP_INT_PEND((start >> 3))); + u32 mask = __raw_readl(S5PC1XX_WKUP_INT_MASK((start >> 3))); + unsigned int irq; + + status &= ~mask; + status &= (1 << (end - start + 1)) - 1; + + for (irq = IRQ_EINT(start); irq <= IRQ_EINT(end); irq++) { + if (status & 1) + generic_handle_irq(irq); + + status >>= 1; + } +} + +static void s3c_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc) +{ + s3c_irq_demux_eint(16, 23); + s3c_irq_demux_eint(24, 31); +} + +/* + * Handle EINT0 ... EINT15 at VIC directly + */ +static void s3c_irq_vic_eint_mask(unsigned int irq) +{ + void __iomem *base = get_irq_chip_data(irq); + unsigned int real; + + s3c_irq_eint_mask(irq); + real = s3c_get_eint(irq); + writel(1 << real, base + VIC_INT_ENABLE_CLEAR); +} + +static void s3c_irq_vic_eint_unmask(unsigned int irq) +{ + void __iomem *base = get_irq_chip_data(irq); + unsigned int real; + + s3c_irq_eint_unmask(irq); + real = s3c_get_eint(irq); + writel(1 << real, base + VIC_INT_ENABLE); +} + +static inline void s3c_irq_vic_eint_ack(unsigned int irq) +{ + u32 bit; + u32 bank = s3c_get_bank(irq); + + bit = s3c_eint_to_bit(irq); + __raw_writel(bit, S5PC1XX_WKUP_INT_PEND(bank)); +} + +static void s3c_irq_vic_eint_maskack(unsigned int irq) +{ + /* compiler should in-line these */ + s3c_irq_vic_eint_mask(irq); + s3c_irq_vic_eint_ack(irq); +} + +static struct irq_chip s3c_irq_vic_eint = { + .name = "EINT", + .mask = s3c_irq_vic_eint_mask, + .unmask = s3c_irq_vic_eint_unmask, + .mask_ack = s3c_irq_vic_eint_maskack, + .ack = s3c_irq_vic_eint_ack, + .set_type = s3c_irq_eint_set_type, + .set_wake = s3c_irqext_wake, +}; + +static int __init s5pc1xx_init_irq_eint(void) +{ + int irq; + + for (irq = IRQ_EINT0; irq <= IRQ_EINT15; irq++) { + set_irq_chip(irq, &s3c_irq_vic_eint); + set_irq_handler(irq, handle_level_irq); + set_irq_flags(irq, IRQF_VALID); + } + + for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) { + set_irq_chip(irq, &s3c_irq_eint); + set_irq_handler(irq, handle_level_irq); + set_irq_flags(irq, IRQF_VALID); + } + + set_irq_chained_handler(IRQ_EINT16_31, s3c_irq_demux_eint16_31); + + return 0; +} + +arch_initcall(s5pc1xx_init_irq_eint); |