From: Thomas Abraham <[email protected]> Add external interrupt support for S5P6440. The external interrupts supported as 0 to 15.
Signed-off-by: Thomas Abraham <[email protected]> Signed-off-by: Kukjin Kim <[email protected]> --- Changes since v1: 1. Removed unused include files. 2. Fix incorrect return values. arch/arm/mach-s5p6440/Makefile | 2 +- arch/arm/mach-s5p6440/irq-eint.c | 164 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 165 insertions(+), 1 deletions(-) create mode 100644 arch/arm/mach-s5p6440/irq-eint.c diff --git a/arch/arm/mach-s5p6440/Makefile b/arch/arm/mach-s5p6440/Makefile index be3c53a..f1bc1e0 100644 --- a/arch/arm/mach-s5p6440/Makefile +++ b/arch/arm/mach-s5p6440/Makefile @@ -12,7 +12,7 @@ obj- := # Core support for S5P6440 system -obj-$(CONFIG_CPU_S5P6440) += cpu.o init.o clock.o gpio.o dma.o +obj-$(CONFIG_CPU_S5P6440) += cpu.o init.o clock.o gpio.o dma.o irq-eint.o obj-$(CONFIG_CPU_S5P6440) += setup-i2c0.o # machine support diff --git a/arch/arm/mach-s5p6440/irq-eint.c b/arch/arm/mach-s5p6440/irq-eint.c new file mode 100644 index 0000000..93310ae --- /dev/null +++ b/arch/arm/mach-s5p6440/irq-eint.c @@ -0,0 +1,164 @@ +/* arch/arm/mach-s5p6440/irq-eint.c + * + * Copyright (c) 2010 Samsung Electronics Co., Ltd + * http://www.samsung.com/ + * + * Based on linux/arch/arm/mach-s3c6410/irq-eint.c + * + * S5P6440 - Interrupt handling for External Interrupts. + * + * 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/gpio.h> +#include <linux/irq.h> +#include <linux/io.h> + +#include <plat/regs-irqtype.h> +#include <mach/regs-gpio.h> +#include <plat/gpio-cfg.h> + +#define eint_offset(irq) ((irq) - IRQ_EINT(0)) +#define eint_irq_to_bit(irq) (1 << eint_offset(irq)) + +static inline void s5p_irq_eint_mask(unsigned int irq) +{ + u32 mask = __raw_readl(S5P6440_EINT0MASK); + + mask |= eint_irq_to_bit(irq); + __raw_writel(mask, S5P6440_EINT0MASK); +} + +static void s5p_irq_eint_unmask(unsigned int irq) +{ + u32 mask = __raw_readl(S5P6440_EINT0MASK); + + mask &= ~eint_irq_to_bit(irq); + __raw_writel(mask, S5P6440_EINT0MASK); +} + +static inline void s5p_irq_eint_ack(unsigned int irq) +{ + __raw_writel(eint_irq_to_bit(irq), S5P6440_EINT0PEND); +} + +static void s5p_irq_eint_maskack(unsigned int irq) +{ + s5p_irq_eint_mask(irq); + s5p_irq_eint_ack(irq); +} + +static int s5p_irq_eint_set_type(unsigned int irq, unsigned int type) +{ + int offs = eint_offset(irq); + int shift; + u32 ctrl, mask; + u32 newvalue = 0; + + if (offs > 15) + return -EINVAL; + + switch (type) { + case IRQ_TYPE_NONE: + printk(KERN_WARNING "No edge setting!\n"); + break; + + case IRQ_TYPE_EDGE_RISING: + newvalue = S3C2410_EXTINT_RISEEDGE; + break; + + case IRQ_TYPE_EDGE_FALLING: + newvalue = S3C2410_EXTINT_FALLEDGE; + break; + + case IRQ_TYPE_EDGE_BOTH: + newvalue = S3C2410_EXTINT_BOTHEDGE; + break; + + case IRQ_TYPE_LEVEL_LOW: + newvalue = S3C2410_EXTINT_LOWLEV; + break; + + case IRQ_TYPE_LEVEL_HIGH: + newvalue = S3C2410_EXTINT_HILEV; + break; + + default: + printk(KERN_ERR "No such irq type %d", type); + return -EINVAL; + } + + shift = (offs / 2) * 4; + mask = 0x7 << shift; + + ctrl = __raw_readl(S5P6440_EINT0CON0) & ~mask; + ctrl |= newvalue << shift; + __raw_writel(ctrl, S5P6440_EINT0CON0); + + s3c_gpio_cfgpin(S5P6440_GPN(offs), S3C_GPIO_SFN(2)); + + return 0; +} + +static struct irq_chip s5p_irq_eint = { + .name = "s5p-eint", + .mask = s5p_irq_eint_mask, + .unmask = s5p_irq_eint_unmask, + .mask_ack = s5p_irq_eint_maskack, + .ack = s5p_irq_eint_ack, + .set_type = s5p_irq_eint_set_type, +}; + +static inline void s5p_irq_demux_eint(unsigned int start, unsigned int end) +{ + u32 status = __raw_readl(S5P6440_EINT0PEND); + u32 mask = __raw_readl(S5P6440_EINT0MASK); + unsigned int irq; + + status &= ~mask; + status >>= start; + 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 s5p_irq_demux_eint0_3(unsigned int irq, struct irq_desc *desc) +{ + s5p_irq_demux_eint(0, 3); +} + +static void s5p_irq_demux_eint4_11(unsigned int irq, struct irq_desc *desc) +{ + s5p_irq_demux_eint(4, 11); +} + +static void s5p_irq_demux_eint12_15(unsigned int irq, struct irq_desc *desc) +{ + s5p_irq_demux_eint(12, 15); +} + +static int __init s5p6440_init_irq_eint(void) +{ + int irq; + + for (irq = IRQ_EINT(0); irq <= IRQ_EINT(15); irq++) { + set_irq_chip(irq, &s5p_irq_eint); + set_irq_handler(irq, handle_level_irq); + set_irq_flags(irq, IRQF_VALID); + } + + set_irq_chained_handler(IRQ_EINT0_3, s5p_irq_demux_eint0_3); + set_irq_chained_handler(IRQ_EINT4_11, s5p_irq_demux_eint4_11); + set_irq_chained_handler(IRQ_EINT12_15, s5p_irq_demux_eint12_15); + + return 0; +} + +arch_initcall(s5p6440_init_irq_eint); -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
