target/linux/ramips/patches-3.18/0005-MIPS-ralink-add-illegal-access-driver.patch

   1 From 60999174904c731e55992a4087999bbd4e5f2051 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Thu, 16 May 2013 23:28:23 +0200
   4 Subject: [PATCH 05/57] MIPS: ralink: add illegal access driver
   5
   6 these SoCs have a special irq that fires upon an illegal memmory access.
   7
   8 Signed-off-by: John Crispin <blogic@openwrt.org>
   9 ---
  10  arch/mips/ralink/Makefile  |    2 +
  11  arch/mips/ralink/ill_acc.c |   87 ++++++++++++++++++++++++++++++++++++++++++++
  12  2 files changed, 89 insertions(+)
  13  create mode 100644 arch/mips/ralink/ill_acc.c
  14
  15 --- a/arch/mips/ralink/Makefile
  16 +++ b/arch/mips/ralink/Makefile
  17 @@ -10,6 +10,8 @@ obj-y := prom.o of.o reset.o clk.o irq.o
  18
  19  obj-$(CONFIG_CLKEVT_RT3352) += cevt-rt3352.o
  20
  21 +obj-$(CONFIG_RALINK_ILL_ACC) += ill_acc.o
  22 +
  23  obj-$(CONFIG_SOC_RT288X) += rt288x.o
  24  obj-$(CONFIG_SOC_RT305X) += rt305x.o
  25  obj-$(CONFIG_SOC_RT3883) += rt3883.o
  26 --- /dev/null
  27 +++ b/arch/mips/ralink/ill_acc.c
  28 @@ -0,0 +1,87 @@
  29 +/*
  30 + * This program is free software; you can redistribute it and/or modify it
  31 + * under the terms of the GNU General Public License version 2 as published
  32 + * by the Free Software Foundation.
  33 + *
  34 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  35 + */
  36 +
  37 +#include <linux/interrupt.h>
  38 +#include <linux/of_platform.h>
  39 +#include <linux/of_irq.h>
  40 +
  41 +#include <asm/mach-ralink/ralink_regs.h>
  42 +
  43 +#define REG_ILL_ACC_ADDR       0x10
  44 +#define REG_ILL_ACC_TYPE       0x14
  45 +
  46 +#define ILL_INT_STATUS         BIT(31)
  47 +#define ILL_ACC_WRITE          BIT(30)
  48 +#define ILL_ACC_LEN_M          0xff
  49 +#define ILL_ACC_OFF_M          0xf
  50 +#define ILL_ACC_OFF_S          16
  51 +#define ILL_ACC_ID_M           0x7
  52 +#define ILL_ACC_ID_S           8
  53 +
  54 +#define        DRV_NAME                "ill_acc"
  55 +
  56 +static const char *ill_acc_ids[] = {
  57 +       "cpu", "dma", "ppe", "pdma rx","pdma tx", "pci/e", "wmac", "usb",
  58 +};
  59 +
  60 +static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
  61 +{
  62 +       struct device *dev = (struct device *) _priv;
  63 +       u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
  64 +       u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
  65 +
  66 +       dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
  67 +               (type & ILL_ACC_WRITE) ? ("write") : ("read"),
  68 +               ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
  69 +               addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
  70 +               type & ILL_ACC_LEN_M);
  71 +
  72 +       rt_memc_w32(REG_ILL_ACC_TYPE, REG_ILL_ACC_TYPE);
  73 +
  74 +       return IRQ_HANDLED;
  75 +}
  76 +
  77 +static int __init ill_acc_of_setup(void)
  78 +{
  79 +       struct platform_device *pdev;
  80 +       struct device_node *np;
  81 +       int irq;
  82 +
  83 +       /* somehow this driver breaks on RT5350 */
  84 +       if (of_machine_is_compatible("ralink,rt5350-soc"))
  85 +               return -EINVAL;
  86 +
  87 +       np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
  88 +       if (!np)
  89 +               return -EINVAL;
  90 +
  91 +       pdev = of_find_device_by_node(np);
  92 +       if (!pdev) {
  93 +               pr_err("%s: failed to lookup pdev\n", np->name);
  94 +               return -EINVAL;
  95 +       }
  96 +
  97 +       irq = irq_of_parse_and_map(np, 0);
  98 +        if (!irq) {
  99 +               dev_err(&pdev->dev, "failed to get irq\n");
 100 +               return -EINVAL;
 101 +       }
 102 +
 103 +       if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
 104 +               dev_err(&pdev->dev, "failed to request irq\n");
 105 +               return -EINVAL;
 106 +       }
 107 +
 108 +       rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
 109 +
 110 +       dev_info(&pdev->dev, "irq registered\n");
 111 +
 112 +       return 0;
 113 +}
 114 +
 115 +arch_initcall(ill_acc_of_setup);