target/linux/ramips/patches-3.8/0053-MIPS-ralink-add-illegal-access-driver.patch

   1 From 69a5834d0a90588578df9689530fc8f3ab8ef59a 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 53/79] MIPS: ralink: add illegal access driver
   5
   6 Signed-off-by: John Crispin <blogic@openwrt.org>
   7 ---
   8  arch/mips/ralink/Makefile  |    2 +-
   9  arch/mips/ralink/ill_acc.c |   87 ++++++++++++++++++++++++++++++++++++++++++++
  10  2 files changed, 88 insertions(+), 1 deletion(-)
  11  create mode 100644 arch/mips/ralink/ill_acc.c
  12
  13 diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile
  14 index 5fa6129..55a5bfc 100644
  15 --- a/arch/mips/ralink/Makefile
  16 +++ b/arch/mips/ralink/Makefile
  17 @@ -6,7 +6,7 @@
  18  # Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
  19  # Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  20
  21 -obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.o
  22 +obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.o ill_acc.o
  23
  24  obj-$(CONFIG_SOC_RT288X) += rt288x.o
  25  obj-$(CONFIG_SOC_RT305X) += rt305x.o
  26 diff --git a/arch/mips/ralink/ill_acc.c b/arch/mips/ralink/ill_acc.c
  27 new file mode 100644
  28 index 0000000..4a3f696
  29 --- /dev/null
  30 +++ b/arch/mips/ralink/ill_acc.c
  31 @@ -0,0 +1,87 @@
  32 +/*
  33 + * This program is free software; you can redistribute it and/or modify it
  34 + * under the terms of the GNU General Public License version 2 as published
  35 + * by the Free Software Foundation.
  36 + *
  37 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  38 + */
  39 +
  40 +#include <linux/interrupt.h>
  41 +#include <linux/of_platform.h>
  42 +#include <linux/of_irq.h>
  43 +
  44 +#include <asm/mach-ralink/ralink_regs.h>
  45 +
  46 +#define REG_ILL_ACC_ADDR       0x10
  47 +#define REG_ILL_ACC_TYPE       0x14
  48 +
  49 +#define ILL_INT_STATUS         BIT(31)
  50 +#define ILL_ACC_WRITE          BIT(30)
  51 +#define ILL_ACC_LEN_M          0xff
  52 +#define ILL_ACC_OFF_M          0xf
  53 +#define ILL_ACC_OFF_S          16
  54 +#define ILL_ACC_ID_M           0x7
  55 +#define ILL_ACC_ID_S           8
  56 +
  57 +#define        DRV_NAME                "ill_acc"
  58 +
  59 +static const char *ill_acc_ids[] = {
  60 +       "cpu", "dma", "ppe", "pdma rx","pdma tx", "pci/e", "wmac", "usb",
  61 +};
  62 +
  63 +static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
  64 +{
  65 +       struct device *dev = (struct device *) _priv;
  66 +       u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
  67 +       u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
  68 +
  69 +       dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
  70 +               (type & ILL_ACC_WRITE) ? ("write") : ("read"),
  71 +               ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
  72 +               addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
  73 +               type & ILL_ACC_LEN_M);
  74 +
  75 +       rt_memc_w32(REG_ILL_ACC_TYPE, REG_ILL_ACC_TYPE);
  76 +
  77 +       return IRQ_HANDLED;
  78 +}
  79 +
  80 +static int __init ill_acc_of_setup(void)
  81 +{
  82 +       struct platform_device *pdev;
  83 +       struct device_node *np;
  84 +       int irq;
  85 +
  86 +       /* somehow this driver breaks on RT5350 */
  87 +       if (of_machine_is_compatible("ralink,rt5350-soc"))
  88 +               return -EINVAL;
  89 +
  90 +       np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
  91 +       if (!np)
  92 +               return -EINVAL;
  93 +
  94 +       pdev = of_find_device_by_node(np);
  95 +       if (!pdev) {
  96 +               pr_err("%s: failed to lookup pdev\n", np->name);
  97 +               return -EINVAL;
  98 +       }
  99 +
 100 +       irq = irq_of_parse_and_map(np, 0);
 101 +        if (!irq) {
 102 +               dev_err(&pdev->dev, "failed to get irq\n");
 103 +               return -EINVAL;
 104 +       }
 105 +
 106 +       if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
 107 +               dev_err(&pdev->dev, "failed to request irq\n");
 108 +               return -EINVAL;
 109 +       }
 110 +
 111 +       rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
 112 +
 113 +       dev_info(&pdev->dev, "irq registered\n");
 114 +
 115 +       return 0;
 116 +}
 117 +
 118 +arch_initcall(ill_acc_of_setup);
 119 --
 120 1.7.10.4
 121