target/linux/ramips/patches-3.9/0137-MIPS-ralink-add-illegal-access-driver.patch

   1 From 0402961539c5a98f3e9eac439e03f89498d110a1 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 137/164] 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 Index: linux-3.9.10/arch/mips/ralink/Makefile
  14 ===================================================================
  15 --- linux-3.9.10.orig/arch/mips/ralink/Makefile 2013-07-14 10:54:04.242545881 +0200
  16 +++ linux-3.9.10/arch/mips/ralink/Makefile      2013-07-14 11:42:58.726615805 +0200
  17 @@ -8,6 +8,8 @@
  18
  19  obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.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 Index: linux-3.9.10/arch/mips/ralink/ill_acc.c
  27 ===================================================================
  28 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  29 +++ linux-3.9.10/arch/mips/ralink/ill_acc.c     2013-07-14 10:54:04.318545882 +0200
  30 @@ -0,0 +1,87 @@
  31 +/*
  32 + * This program is free software; you can redistribute it and/or modify it
  33 + * under the terms of the GNU General Public License version 2 as published
  34 + * by the Free Software Foundation.
  35 + *
  36 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  37 + */
  38 +
  39 +#include <linux/interrupt.h>
  40 +#include <linux/of_platform.h>
  41 +#include <linux/of_irq.h>
  42 +
  43 +#include <asm/mach-ralink/ralink_regs.h>
  44 +
  45 +#define REG_ILL_ACC_ADDR       0x10
  46 +#define REG_ILL_ACC_TYPE       0x14
  47 +
  48 +#define ILL_INT_STATUS         BIT(31)
  49 +#define ILL_ACC_WRITE          BIT(30)
  50 +#define ILL_ACC_LEN_M          0xff
  51 +#define ILL_ACC_OFF_M          0xf
  52 +#define ILL_ACC_OFF_S          16
  53 +#define ILL_ACC_ID_M           0x7
  54 +#define ILL_ACC_ID_S           8
  55 +
  56 +#define        DRV_NAME                "ill_acc"
  57 +
  58 +static const char *ill_acc_ids[] = {
  59 +       "cpu", "dma", "ppe", "pdma rx","pdma tx", "pci/e", "wmac", "usb",
  60 +};
  61 +
  62 +static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
  63 +{
  64 +       struct device *dev = (struct device *) _priv;
  65 +       u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
  66 +       u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
  67 +
  68 +       dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
  69 +               (type & ILL_ACC_WRITE) ? ("write") : ("read"),
  70 +               ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
  71 +               addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
  72 +               type & ILL_ACC_LEN_M);
  73 +
  74 +       rt_memc_w32(REG_ILL_ACC_TYPE, REG_ILL_ACC_TYPE);
  75 +
  76 +       return IRQ_HANDLED;
  77 +}
  78 +
  79 +static int __init ill_acc_of_setup(void)
  80 +{
  81 +       struct platform_device *pdev;
  82 +       struct device_node *np;
  83 +       int irq;
  84 +
  85 +       /* somehow this driver breaks on RT5350 */
  86 +       if (of_machine_is_compatible("ralink,rt5350-soc"))
  87 +               return -EINVAL;
  88 +
  89 +       np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
  90 +       if (!np)
  91 +               return -EINVAL;
  92 +
  93 +       pdev = of_find_device_by_node(np);
  94 +       if (!pdev) {
  95 +               pr_err("%s: failed to lookup pdev\n", np->name);
  96 +               return -EINVAL;
  97 +       }
  98 +
  99 +       irq = irq_of_parse_and_map(np, 0);
 100 +        if (!irq) {
 101 +               dev_err(&pdev->dev, "failed to get irq\n");
 102 +               return -EINVAL;
 103 +       }
 104 +
 105 +       if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
 106 +               dev_err(&pdev->dev, "failed to request irq\n");
 107 +               return -EINVAL;
 108 +       }
 109 +
 110 +       rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
 111 +
 112 +       dev_info(&pdev->dev, "irq registered\n");
 113 +
 114 +       return 0;
 115 +}
 116 +
 117 +arch_initcall(ill_acc_of_setup);