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114 lines
3.0 KiB
Diff
114 lines
3.0 KiB
Diff
From c5fe00f24f56b15f982dda355089986d57488b36 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Thu, 16 May 2013 23:28:23 +0200
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Subject: [PATCH 103/133] MIPS: ralink: add illegal access driver
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/ralink/Makefile | 2 +
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arch/mips/ralink/ill_acc.c | 87 ++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 89 insertions(+)
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create mode 100644 arch/mips/ralink/ill_acc.c
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--- a/arch/mips/ralink/Makefile
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+++ b/arch/mips/ralink/Makefile
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@@ -10,6 +10,8 @@ obj-y := prom.o of.o reset.o clk.o irq.o
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obj-$(CONFIG_CLKEVT_RT3352) += cevt-rt3352.o
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+obj-$(CONFIG_RALINK_ILL_ACC) += ill_acc.o
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+
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obj-$(CONFIG_SOC_RT288X) += rt288x.o
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obj-$(CONFIG_SOC_RT305X) += rt305x.o
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obj-$(CONFIG_SOC_RT3883) += rt3883.o
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--- /dev/null
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+++ b/arch/mips/ralink/ill_acc.c
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@@ -0,0 +1,87 @@
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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 version 2 as published
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+ * by the Free Software Foundation.
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+ *
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+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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+ */
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+
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+#include <linux/interrupt.h>
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+#include <linux/of_platform.h>
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+#include <linux/of_irq.h>
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+
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+#include <asm/mach-ralink/ralink_regs.h>
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+
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+#define REG_ILL_ACC_ADDR 0x10
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+#define REG_ILL_ACC_TYPE 0x14
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+
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+#define ILL_INT_STATUS BIT(31)
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+#define ILL_ACC_WRITE BIT(30)
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+#define ILL_ACC_LEN_M 0xff
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+#define ILL_ACC_OFF_M 0xf
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+#define ILL_ACC_OFF_S 16
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+#define ILL_ACC_ID_M 0x7
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+#define ILL_ACC_ID_S 8
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+
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+#define DRV_NAME "ill_acc"
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+
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+static const char *ill_acc_ids[] = {
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+ "cpu", "dma", "ppe", "pdma rx","pdma tx", "pci/e", "wmac", "usb",
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+};
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+
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+static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
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+{
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+ struct device *dev = (struct device *) _priv;
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+ u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
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+ u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
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+
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+ dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
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+ (type & ILL_ACC_WRITE) ? ("write") : ("read"),
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+ ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
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+ addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
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+ type & ILL_ACC_LEN_M);
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+
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+ rt_memc_w32(REG_ILL_ACC_TYPE, REG_ILL_ACC_TYPE);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+static int __init ill_acc_of_setup(void)
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+{
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+ struct platform_device *pdev;
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+ struct device_node *np;
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+ int irq;
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+
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+ /* somehow this driver breaks on RT5350 */
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+ if (of_machine_is_compatible("ralink,rt5350-soc"))
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+ return -EINVAL;
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+
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+ np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
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+ if (!np)
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+ return -EINVAL;
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+
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+ pdev = of_find_device_by_node(np);
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+ if (!pdev) {
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+ pr_err("%s: failed to lookup pdev\n", np->name);
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+ return -EINVAL;
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+ }
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+
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+ irq = irq_of_parse_and_map(np, 0);
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+ if (!irq) {
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+ dev_err(&pdev->dev, "failed to get irq\n");
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+ return -EINVAL;
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+ }
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+
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+ if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
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+ dev_err(&pdev->dev, "failed to request irq\n");
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+ return -EINVAL;
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+ }
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+
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+ rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
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+
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+ dev_info(&pdev->dev, "irq registered\n");
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+
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+ return 0;
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+}
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+
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+arch_initcall(ill_acc_of_setup);
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