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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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