From f6a9c8215a4553357b8a1939fafb2d6dfbacf944 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Sat, 17 Jul 2010 11:08:43 +0000 Subject: [PATCH] MIPS: JZ4740: Add IRQ handler code Add support for IRQ handling on a JZ4740 SoC. Signed-off-by: Lars-Peter Clausen Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1465/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/mach-jz4740/irq.h | 57 +++++++++++ arch/mips/jz4740/irq.c | 167 +++++++++++++++++++++++++++++++ arch/mips/jz4740/irq.h | 21 ++++ 3 files changed, 245 insertions(+), 0 deletions(-) create mode 100644 arch/mips/include/asm/mach-jz4740/irq.h create mode 100644 arch/mips/jz4740/irq.c create mode 100644 arch/mips/jz4740/irq.h --- /dev/null +++ b/arch/mips/include/asm/mach-jz4740/irq.h @@ -0,0 +1,57 @@ +/* + * Copyright (C) 2009-2010, Lars-Peter Clausen + * JZ4740 IRQ definitions + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#ifndef __ASM_MACH_JZ4740_IRQ_H__ +#define __ASM_MACH_JZ4740_IRQ_H__ + +#define MIPS_CPU_IRQ_BASE 0 +#define JZ4740_IRQ_BASE 8 + +/* 1st-level interrupts */ +#define JZ4740_IRQ(x) (JZ4740_IRQ_BASE + (x)) +#define JZ4740_IRQ_I2C JZ4740_IRQ(1) +#define JZ4740_IRQ_UHC JZ4740_IRQ(3) +#define JZ4740_IRQ_UART1 JZ4740_IRQ(8) +#define JZ4740_IRQ_UART0 JZ4740_IRQ(9) +#define JZ4740_IRQ_SADC JZ4740_IRQ(12) +#define JZ4740_IRQ_MSC JZ4740_IRQ(14) +#define JZ4740_IRQ_RTC JZ4740_IRQ(15) +#define JZ4740_IRQ_SSI JZ4740_IRQ(16) +#define JZ4740_IRQ_CIM JZ4740_IRQ(17) +#define JZ4740_IRQ_AIC JZ4740_IRQ(18) +#define JZ4740_IRQ_ETH JZ4740_IRQ(19) +#define JZ4740_IRQ_DMAC JZ4740_IRQ(20) +#define JZ4740_IRQ_TCU2 JZ4740_IRQ(21) +#define JZ4740_IRQ_TCU1 JZ4740_IRQ(22) +#define JZ4740_IRQ_TCU0 JZ4740_IRQ(23) +#define JZ4740_IRQ_UDC JZ4740_IRQ(24) +#define JZ4740_IRQ_GPIO3 JZ4740_IRQ(25) +#define JZ4740_IRQ_GPIO2 JZ4740_IRQ(26) +#define JZ4740_IRQ_GPIO1 JZ4740_IRQ(27) +#define JZ4740_IRQ_GPIO0 JZ4740_IRQ(28) +#define JZ4740_IRQ_IPU JZ4740_IRQ(29) +#define JZ4740_IRQ_LCD JZ4740_IRQ(30) + +/* 2nd-level interrupts */ +#define JZ4740_IRQ_DMA(x) (JZ4740_IRQ(32) + (X)) + +#define JZ4740_IRQ_INTC_GPIO(x) (JZ4740_IRQ_GPIO0 - (x)) +#define JZ4740_IRQ_GPIO(x) (JZ4740_IRQ(48) + (x)) + +#define JZ4740_IRQ_ADC_BASE JZ4740_IRQ(176) + +#define NR_IRQS (JZ4740_IRQ_ADC_BASE + 6) + +#endif --- /dev/null +++ b/arch/mips/jz4740/irq.c @@ -0,0 +1,167 @@ +/* + * Copyright (C) 2009-2010, Lars-Peter Clausen + * JZ4740 platform IRQ support + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include + +#include + +static void __iomem *jz_intc_base; +static uint32_t jz_intc_wakeup; +static uint32_t jz_intc_saved; + +#define JZ_REG_INTC_STATUS 0x00 +#define JZ_REG_INTC_MASK 0x04 +#define JZ_REG_INTC_SET_MASK 0x08 +#define JZ_REG_INTC_CLEAR_MASK 0x0c +#define JZ_REG_INTC_PENDING 0x10 + +#define IRQ_BIT(x) BIT((x) - JZ4740_IRQ_BASE) + +static void intc_irq_unmask(unsigned int irq) +{ + writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_CLEAR_MASK); +} + +static void intc_irq_mask(unsigned int irq) +{ + writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_SET_MASK); +} + +static int intc_irq_set_wake(unsigned int irq, unsigned int on) +{ + if (on) + jz_intc_wakeup |= IRQ_BIT(irq); + else + jz_intc_wakeup &= ~IRQ_BIT(irq); + + return 0; +} + +static struct irq_chip intc_irq_type = { + .name = "INTC", + .mask = intc_irq_mask, + .mask_ack = intc_irq_mask, + .unmask = intc_irq_unmask, + .set_wake = intc_irq_set_wake, +}; + +static irqreturn_t jz4740_cascade(int irq, void *data) +{ + uint32_t irq_reg; + + irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING); + + if (irq_reg) + generic_handle_irq(__fls(irq_reg) + JZ4740_IRQ_BASE); + + return IRQ_HANDLED; +} + +static struct irqaction jz4740_cascade_action = { + .handler = jz4740_cascade, + .name = "JZ4740 cascade interrupt", +}; + +void __init arch_init_irq(void) +{ + int i; + mips_cpu_irq_init(); + + jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14); + + for (i = JZ4740_IRQ_BASE; i < JZ4740_IRQ_BASE + 32; i++) { + intc_irq_mask(i); + set_irq_chip_and_handler(i, &intc_irq_type, handle_level_irq); + } + + setup_irq(2, &jz4740_cascade_action); +} + +asmlinkage void plat_irq_dispatch(void) +{ + unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; + if (pending & STATUSF_IP2) + do_IRQ(2); + else if (pending & STATUSF_IP3) + do_IRQ(3); + else + spurious_interrupt(); +} + +void jz4740_intc_suspend(void) +{ + jz_intc_saved = readl(jz_intc_base + JZ_REG_INTC_MASK); + writel(~jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_SET_MASK); + writel(jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_CLEAR_MASK); +} + +void jz4740_intc_resume(void) +{ + writel(~jz_intc_saved, jz_intc_base + JZ_REG_INTC_CLEAR_MASK); + writel(jz_intc_saved, jz_intc_base + JZ_REG_INTC_SET_MASK); +} + +#ifdef CONFIG_DEBUG_FS + +static inline void intc_seq_reg(struct seq_file *s, const char *name, + unsigned int reg) +{ + seq_printf(s, "%s:\t\t%08x\n", name, readl(jz_intc_base + reg)); +} + +static int intc_regs_show(struct seq_file *s, void *unused) +{ + intc_seq_reg(s, "Status", JZ_REG_INTC_STATUS); + intc_seq_reg(s, "Mask", JZ_REG_INTC_MASK); + intc_seq_reg(s, "Pending", JZ_REG_INTC_PENDING); + + return 0; +} + +static int intc_regs_open(struct inode *inode, struct file *file) +{ + return single_open(file, intc_regs_show, NULL); +} + +static const struct file_operations intc_regs_operations = { + .open = intc_regs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init intc_debugfs_init(void) +{ + (void) debugfs_create_file("jz_regs_intc", S_IFREG | S_IRUGO, + NULL, NULL, &intc_regs_operations); + return 0; +} +subsys_initcall(intc_debugfs_init); + +#endif --- /dev/null +++ b/arch/mips/jz4740/irq.h @@ -0,0 +1,21 @@ +/* + * Copyright (C) 2010, Lars-Peter Clausen + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#ifndef __MIPS_JZ4740_IRQ_H__ +#define __MIPS_JZ4740_IRQ_H__ + +extern void jz4740_intc_suspend(void); +extern void jz4740_intc_resume(void); + +#endif