mirror of https://github.com/hak5/openwrt-owl.git
276 lines
7.7 KiB
Diff
276 lines
7.7 KiB
Diff
From f6a9c8215a4553357b8a1939fafb2d6dfbacf944 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 17 Jul 2010 11:08:43 +0000
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Subject: [PATCH] MIPS: JZ4740: Add IRQ handler code
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Add support for IRQ handling on a JZ4740 SoC.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Cc: linux-mips@linux-mips.org
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Cc: linux-kernel@vger.kernel.org
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Patchwork: https://patchwork.linux-mips.org/patch/1465/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/include/asm/mach-jz4740/irq.h | 57 +++++++++++
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arch/mips/jz4740/irq.c | 167 +++++++++++++++++++++++++++++++
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arch/mips/jz4740/irq.h | 21 ++++
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3 files changed, 245 insertions(+), 0 deletions(-)
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create mode 100644 arch/mips/include/asm/mach-jz4740/irq.h
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create mode 100644 arch/mips/jz4740/irq.c
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create mode 100644 arch/mips/jz4740/irq.h
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--- /dev/null
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+++ b/arch/mips/include/asm/mach-jz4740/irq.h
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@@ -0,0 +1,57 @@
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+/*
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+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * JZ4740 IRQ definitions
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#ifndef __ASM_MACH_JZ4740_IRQ_H__
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+#define __ASM_MACH_JZ4740_IRQ_H__
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+
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+#define MIPS_CPU_IRQ_BASE 0
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+#define JZ4740_IRQ_BASE 8
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+
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+/* 1st-level interrupts */
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+#define JZ4740_IRQ(x) (JZ4740_IRQ_BASE + (x))
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+#define JZ4740_IRQ_I2C JZ4740_IRQ(1)
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+#define JZ4740_IRQ_UHC JZ4740_IRQ(3)
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+#define JZ4740_IRQ_UART1 JZ4740_IRQ(8)
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+#define JZ4740_IRQ_UART0 JZ4740_IRQ(9)
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+#define JZ4740_IRQ_SADC JZ4740_IRQ(12)
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+#define JZ4740_IRQ_MSC JZ4740_IRQ(14)
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+#define JZ4740_IRQ_RTC JZ4740_IRQ(15)
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+#define JZ4740_IRQ_SSI JZ4740_IRQ(16)
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+#define JZ4740_IRQ_CIM JZ4740_IRQ(17)
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+#define JZ4740_IRQ_AIC JZ4740_IRQ(18)
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+#define JZ4740_IRQ_ETH JZ4740_IRQ(19)
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+#define JZ4740_IRQ_DMAC JZ4740_IRQ(20)
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+#define JZ4740_IRQ_TCU2 JZ4740_IRQ(21)
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+#define JZ4740_IRQ_TCU1 JZ4740_IRQ(22)
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+#define JZ4740_IRQ_TCU0 JZ4740_IRQ(23)
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+#define JZ4740_IRQ_UDC JZ4740_IRQ(24)
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+#define JZ4740_IRQ_GPIO3 JZ4740_IRQ(25)
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+#define JZ4740_IRQ_GPIO2 JZ4740_IRQ(26)
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+#define JZ4740_IRQ_GPIO1 JZ4740_IRQ(27)
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+#define JZ4740_IRQ_GPIO0 JZ4740_IRQ(28)
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+#define JZ4740_IRQ_IPU JZ4740_IRQ(29)
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+#define JZ4740_IRQ_LCD JZ4740_IRQ(30)
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+
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+/* 2nd-level interrupts */
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+#define JZ4740_IRQ_DMA(x) (JZ4740_IRQ(32) + (X))
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+
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+#define JZ4740_IRQ_INTC_GPIO(x) (JZ4740_IRQ_GPIO0 - (x))
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+#define JZ4740_IRQ_GPIO(x) (JZ4740_IRQ(48) + (x))
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+
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+#define JZ4740_IRQ_ADC_BASE JZ4740_IRQ(176)
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+
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+#define NR_IRQS (JZ4740_IRQ_ADC_BASE + 6)
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+
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+#endif
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--- /dev/null
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+++ b/arch/mips/jz4740/irq.c
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@@ -0,0 +1,167 @@
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+/*
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+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * JZ4740 platform IRQ support
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#include <linux/errno.h>
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+#include <linux/init.h>
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+#include <linux/types.h>
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+#include <linux/interrupt.h>
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+#include <linux/ioport.h>
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+#include <linux/timex.h>
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+#include <linux/slab.h>
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+#include <linux/delay.h>
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+
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+#include <linux/debugfs.h>
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+#include <linux/seq_file.h>
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+
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+#include <asm/io.h>
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+#include <asm/mipsregs.h>
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+#include <asm/irq_cpu.h>
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+
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+#include <asm/mach-jz4740/base.h>
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+
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+static void __iomem *jz_intc_base;
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+static uint32_t jz_intc_wakeup;
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+static uint32_t jz_intc_saved;
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+
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+#define JZ_REG_INTC_STATUS 0x00
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+#define JZ_REG_INTC_MASK 0x04
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+#define JZ_REG_INTC_SET_MASK 0x08
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+#define JZ_REG_INTC_CLEAR_MASK 0x0c
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+#define JZ_REG_INTC_PENDING 0x10
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+
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+#define IRQ_BIT(x) BIT((x) - JZ4740_IRQ_BASE)
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+
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+static void intc_irq_unmask(unsigned int irq)
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+{
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+ writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_CLEAR_MASK);
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+}
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+
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+static void intc_irq_mask(unsigned int irq)
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+{
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+ writel(IRQ_BIT(irq), jz_intc_base + JZ_REG_INTC_SET_MASK);
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+}
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+
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+static int intc_irq_set_wake(unsigned int irq, unsigned int on)
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+{
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+ if (on)
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+ jz_intc_wakeup |= IRQ_BIT(irq);
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+ else
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+ jz_intc_wakeup &= ~IRQ_BIT(irq);
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+
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+ return 0;
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+}
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+
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+static struct irq_chip intc_irq_type = {
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+ .name = "INTC",
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+ .mask = intc_irq_mask,
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+ .mask_ack = intc_irq_mask,
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+ .unmask = intc_irq_unmask,
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+ .set_wake = intc_irq_set_wake,
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+};
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+
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+static irqreturn_t jz4740_cascade(int irq, void *data)
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+{
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+ uint32_t irq_reg;
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+
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+ irq_reg = readl(jz_intc_base + JZ_REG_INTC_PENDING);
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+
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+ if (irq_reg)
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+ generic_handle_irq(__fls(irq_reg) + JZ4740_IRQ_BASE);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static struct irqaction jz4740_cascade_action = {
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+ .handler = jz4740_cascade,
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+ .name = "JZ4740 cascade interrupt",
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+};
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+
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+void __init arch_init_irq(void)
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+{
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+ int i;
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+ mips_cpu_irq_init();
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+
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+ jz_intc_base = ioremap(JZ4740_INTC_BASE_ADDR, 0x14);
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+
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+ for (i = JZ4740_IRQ_BASE; i < JZ4740_IRQ_BASE + 32; i++) {
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+ intc_irq_mask(i);
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+ set_irq_chip_and_handler(i, &intc_irq_type, handle_level_irq);
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+ }
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+
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+ setup_irq(2, &jz4740_cascade_action);
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+}
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+
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+asmlinkage void plat_irq_dispatch(void)
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+{
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+ unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
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+ if (pending & STATUSF_IP2)
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+ do_IRQ(2);
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+ else if (pending & STATUSF_IP3)
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+ do_IRQ(3);
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+ else
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+ spurious_interrupt();
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+}
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+
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+void jz4740_intc_suspend(void)
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+{
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+ jz_intc_saved = readl(jz_intc_base + JZ_REG_INTC_MASK);
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+ writel(~jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_SET_MASK);
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+ writel(jz_intc_wakeup, jz_intc_base + JZ_REG_INTC_CLEAR_MASK);
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+}
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+
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+void jz4740_intc_resume(void)
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+{
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+ writel(~jz_intc_saved, jz_intc_base + JZ_REG_INTC_CLEAR_MASK);
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+ writel(jz_intc_saved, jz_intc_base + JZ_REG_INTC_SET_MASK);
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+}
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+
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+#ifdef CONFIG_DEBUG_FS
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+
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+static inline void intc_seq_reg(struct seq_file *s, const char *name,
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+ unsigned int reg)
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+{
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+ seq_printf(s, "%s:\t\t%08x\n", name, readl(jz_intc_base + reg));
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+}
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+
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+static int intc_regs_show(struct seq_file *s, void *unused)
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+{
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+ intc_seq_reg(s, "Status", JZ_REG_INTC_STATUS);
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+ intc_seq_reg(s, "Mask", JZ_REG_INTC_MASK);
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+ intc_seq_reg(s, "Pending", JZ_REG_INTC_PENDING);
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+
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+ return 0;
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+}
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+
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+static int intc_regs_open(struct inode *inode, struct file *file)
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+{
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+ return single_open(file, intc_regs_show, NULL);
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+}
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+
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+static const struct file_operations intc_regs_operations = {
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+ .open = intc_regs_open,
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+ .read = seq_read,
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+ .llseek = seq_lseek,
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+ .release = single_release,
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+};
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+
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+static int __init intc_debugfs_init(void)
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+{
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+ (void) debugfs_create_file("jz_regs_intc", S_IFREG | S_IRUGO,
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+ NULL, NULL, &intc_regs_operations);
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+ return 0;
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+}
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+subsys_initcall(intc_debugfs_init);
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+
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+#endif
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--- /dev/null
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+++ b/arch/mips/jz4740/irq.h
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@@ -0,0 +1,21 @@
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+/*
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+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#ifndef __MIPS_JZ4740_IRQ_H__
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+#define __MIPS_JZ4740_IRQ_H__
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+
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+extern void jz4740_intc_suspend(void);
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+extern void jz4740_intc_resume(void);
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+
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+#endif
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