222 lines
5.2 KiB
C
222 lines
5.2 KiB
C
/*
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* Copyright (c) 2010 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* S5P - IRQ EINT support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <linux/device.h>
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#include <linux/gpio.h>
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#include <linux/irqchip/arm-vic.h>
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#include <linux/of.h>
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#include <plat/regs-irqtype.h>
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#include <mach/map.h>
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#include <plat/cpu.h>
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#include <plat/pm.h>
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#include <plat/gpio-cfg.h>
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#include <mach/regs-gpio.h>
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static inline void s5p_irq_eint_mask(struct irq_data *data)
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{
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u32 mask;
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mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
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mask |= eint_irq_to_bit(data->irq);
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__raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
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}
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static void s5p_irq_eint_unmask(struct irq_data *data)
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{
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u32 mask;
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mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(data->irq)));
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mask &= ~(eint_irq_to_bit(data->irq));
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__raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(data->irq)));
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}
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static inline void s5p_irq_eint_ack(struct irq_data *data)
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{
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__raw_writel(eint_irq_to_bit(data->irq),
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S5P_EINT_PEND(EINT_REG_NR(data->irq)));
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}
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static void s5p_irq_eint_maskack(struct irq_data *data)
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{
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/* compiler should in-line these */
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s5p_irq_eint_mask(data);
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s5p_irq_eint_ack(data);
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}
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static int s5p_irq_eint_set_type(struct irq_data *data, unsigned int type)
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{
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int offs = EINT_OFFSET(data->irq);
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int shift;
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u32 ctrl, mask;
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u32 newvalue = 0;
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switch (type) {
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case IRQ_TYPE_EDGE_RISING:
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newvalue = S5P_IRQ_TYPE_EDGE_RISING;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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newvalue = S5P_IRQ_TYPE_EDGE_FALLING;
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break;
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case IRQ_TYPE_EDGE_BOTH:
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newvalue = S5P_IRQ_TYPE_EDGE_BOTH;
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break;
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case IRQ_TYPE_LEVEL_LOW:
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newvalue = S5P_IRQ_TYPE_LEVEL_LOW;
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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newvalue = S5P_IRQ_TYPE_LEVEL_HIGH;
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break;
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default:
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printk(KERN_ERR "No such irq type %d", type);
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return -EINVAL;
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}
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shift = (offs & 0x7) * 4;
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mask = 0x7 << shift;
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ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(data->irq)));
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ctrl &= ~mask;
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ctrl |= newvalue << shift;
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__raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(data->irq)));
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if ((0 <= offs) && (offs < 8))
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s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
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else if ((8 <= offs) && (offs < 16))
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s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
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else if ((16 <= offs) && (offs < 24))
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s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
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else if ((24 <= offs) && (offs < 32))
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s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
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else
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printk(KERN_ERR "No such irq number %d", offs);
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return 0;
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}
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static struct irq_chip s5p_irq_eint = {
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.name = "s5p-eint",
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.irq_mask = s5p_irq_eint_mask,
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.irq_unmask = s5p_irq_eint_unmask,
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.irq_mask_ack = s5p_irq_eint_maskack,
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.irq_ack = s5p_irq_eint_ack,
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.irq_set_type = s5p_irq_eint_set_type,
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#ifdef CONFIG_PM
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.irq_set_wake = s3c_irqext_wake,
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#endif
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};
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/* s5p_irq_demux_eint
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*
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* This function demuxes the IRQ from the group0 external interrupts,
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* from EINTs 16 to 31. It is designed to be inlined into the specific
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* handler s5p_irq_demux_eintX_Y.
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*
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* Each EINT pend/mask registers handle eight of them.
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*/
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static inline void s5p_irq_demux_eint(unsigned int start)
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{
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u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
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u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
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unsigned int irq;
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status &= ~mask;
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status &= 0xff;
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while (status) {
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irq = fls(status) - 1;
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generic_handle_irq(irq + start);
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status &= ~(1 << irq);
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}
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}
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static void s5p_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
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{
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s5p_irq_demux_eint(IRQ_EINT(16));
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s5p_irq_demux_eint(IRQ_EINT(24));
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}
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static inline void s5p_irq_vic_eint_mask(struct irq_data *data)
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{
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void __iomem *base = irq_data_get_irq_chip_data(data);
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s5p_irq_eint_mask(data);
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writel(1 << EINT_OFFSET(data->irq), base + VIC_INT_ENABLE_CLEAR);
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}
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static void s5p_irq_vic_eint_unmask(struct irq_data *data)
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{
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void __iomem *base = irq_data_get_irq_chip_data(data);
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s5p_irq_eint_unmask(data);
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writel(1 << EINT_OFFSET(data->irq), base + VIC_INT_ENABLE);
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}
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static inline void s5p_irq_vic_eint_ack(struct irq_data *data)
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{
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__raw_writel(eint_irq_to_bit(data->irq),
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S5P_EINT_PEND(EINT_REG_NR(data->irq)));
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}
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static void s5p_irq_vic_eint_maskack(struct irq_data *data)
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{
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s5p_irq_vic_eint_mask(data);
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s5p_irq_vic_eint_ack(data);
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}
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static struct irq_chip s5p_irq_vic_eint = {
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.name = "s5p_vic_eint",
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.irq_mask = s5p_irq_vic_eint_mask,
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.irq_unmask = s5p_irq_vic_eint_unmask,
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.irq_mask_ack = s5p_irq_vic_eint_maskack,
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.irq_ack = s5p_irq_vic_eint_ack,
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.irq_set_type = s5p_irq_eint_set_type,
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#ifdef CONFIG_PM
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.irq_set_wake = s3c_irqext_wake,
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#endif
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};
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static int __init s5p_init_irq_eint(void)
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{
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int irq;
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if (of_have_populated_dt())
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return -ENODEV;
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for (irq = IRQ_EINT(0); irq <= IRQ_EINT(15); irq++)
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irq_set_chip(irq, &s5p_irq_vic_eint);
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for (irq = IRQ_EINT(16); irq <= IRQ_EINT(31); irq++) {
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irq_set_chip_and_handler(irq, &s5p_irq_eint, handle_level_irq);
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set_irq_flags(irq, IRQF_VALID);
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}
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irq_set_chained_handler(IRQ_EINT16_31, s5p_irq_demux_eint16_31);
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return 0;
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}
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arch_initcall(s5p_init_irq_eint);
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