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From 60999174904c731e55992a4087999bbd4e5f2051 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 16 May 2013 23:28:23 +0200
Subject: [PATCH 05/57] MIPS: ralink: add illegal access driver
these SoCs have a special irq that fires upon an illegal memmory access.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/ralink/Makefile | 2 +
arch/mips/ralink/ill_acc.c | 87 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 89 insertions(+)
create mode 100644 arch/mips/ralink/ill_acc.c
--- a/arch/mips/ralink/Makefile
+++ b/arch/mips/ralink/Makefile
@@ -10,6 +10,8 @@ obj-y := prom.o of.o reset.o clk.o irq.o
obj-$(CONFIG_CLKEVT_RT3352) += cevt-rt3352.o
+obj-$(CONFIG_RALINK_ILL_ACC) += ill_acc.o
+
obj-$(CONFIG_SOC_RT288X) += rt288x.o
obj-$(CONFIG_SOC_RT305X) += rt305x.o
obj-$(CONFIG_SOC_RT3883) += rt3883.o
--- /dev/null
+++ b/arch/mips/ralink/ill_acc.c
@@ -0,0 +1,87 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/interrupt.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define REG_ILL_ACC_ADDR 0x10
+#define REG_ILL_ACC_TYPE 0x14
+
+#define ILL_INT_STATUS BIT(31)
+#define ILL_ACC_WRITE BIT(30)
+#define ILL_ACC_LEN_M 0xff
+#define ILL_ACC_OFF_M 0xf
+#define ILL_ACC_OFF_S 16
+#define ILL_ACC_ID_M 0x7
+#define ILL_ACC_ID_S 8
+
+#define DRV_NAME "ill_acc"
+
+static const char *ill_acc_ids[] = {
+ "cpu", "dma", "ppe", "pdma rx","pdma tx", "pci/e", "wmac", "usb",
+};
+
+static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
+{
+ struct device *dev = (struct device *) _priv;
+ u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
+ u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
+
+ dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
+ (type & ILL_ACC_WRITE) ? ("write") : ("read"),
+ ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
+ addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
+ type & ILL_ACC_LEN_M);
+
+ rt_memc_w32(REG_ILL_ACC_TYPE, REG_ILL_ACC_TYPE);
+
+ return IRQ_HANDLED;
+}
+
+static int __init ill_acc_of_setup(void)
+{
+ struct platform_device *pdev;
+ struct device_node *np;
+ int irq;
+
+ /* somehow this driver breaks on RT5350 */
+ if (of_machine_is_compatible("ralink,rt5350-soc"))
+ return -EINVAL;
+
+ np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
+ if (!np)
+ return -EINVAL;
+
+ pdev = of_find_device_by_node(np);
+ if (!pdev) {
+ pr_err("%s: failed to lookup pdev\n", np->name);
+ return -EINVAL;
+ }
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (!irq) {
+ dev_err(&pdev->dev, "failed to get irq\n");
+ return -EINVAL;
+ }
+
+ if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ return -EINVAL;
+ }
+
+ rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
+
+ dev_info(&pdev->dev, "irq registered\n");
+
+ return 0;
+}
+
+arch_initcall(ill_acc_of_setup);
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