target/linux/ramips/patches-3.10/0104-MIPS-ralink-add-illegal-access-driver.patch

   1 From 46446fcfc6e823005ebe71357b5995524e75542c 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 08/33] 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, 89 insertions(+)
  11  create mode 100644 arch/mips/ralink/ill_acc.c
  12
  13 --- a/arch/mips/ralink/Makefile
  14 +++ b/arch/mips/ralink/Makefile
  15 @@ -10,6 +10,8 @@ obj-y := prom.o of.o reset.o clk.o irq.o
  16
  17  obj-$(CONFIG_CLKEVT_RT3352) += cevt-rt3352.o
  18
  19 +obj-$(CONFIG_RALINK_ILL_ACC) += ill_acc.o
  20 +
  21  obj-$(CONFIG_SOC_RT288X) += rt288x.o
  22  obj-$(CONFIG_SOC_RT305X) += rt305x.o
  23  obj-$(CONFIG_SOC_RT3883) += rt3883.o
  24 --- /dev/null
  25 +++ b/arch/mips/ralink/ill_acc.c
  26 @@ -0,0 +1,87 @@
  27 +/*
  28 + * This program is free software; you can redistribute it and/or modify it
  29 + * under the terms of the GNU General Public License version 2 as published
  30 + * by the Free Software Foundation.
  31 + *
  32 + * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  33 + */
  34 +
  35 +#include <linux/interrupt.h>
  36 +#include <linux/of_platform.h>
  37 +#include <linux/of_irq.h>
  38 +
  39 +#include <asm/mach-ralink/ralink_regs.h>
  40 +
  41 +#define REG_ILL_ACC_ADDR       0x10
  42 +#define REG_ILL_ACC_TYPE       0x14
  43 +
  44 +#define ILL_INT_STATUS         BIT(31)
  45 +#define ILL_ACC_WRITE          BIT(30)
  46 +#define ILL_ACC_LEN_M          0xff
  47 +#define ILL_ACC_OFF_M          0xf
  48 +#define ILL_ACC_OFF_S          16
  49 +#define ILL_ACC_ID_M           0x7
  50 +#define ILL_ACC_ID_S           8
  51 +
  52 +#define        DRV_NAME                "ill_acc"
  53 +
  54 +static const char *ill_acc_ids[] = {
  55 +       "cpu", "dma", "ppe", "pdma rx","pdma tx", "pci/e", "wmac", "usb",
  56 +};
  57 +
  58 +static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
  59 +{
  60 +       struct device *dev = (struct device *) _priv;
  61 +       u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
  62 +       u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
  63 +
  64 +       dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
  65 +               (type & ILL_ACC_WRITE) ? ("write") : ("read"),
  66 +               ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
  67 +               addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
  68 +               type & ILL_ACC_LEN_M);
  69 +
  70 +       rt_memc_w32(REG_ILL_ACC_TYPE, REG_ILL_ACC_TYPE);
  71 +
  72 +       return IRQ_HANDLED;
  73 +}
  74 +
  75 +static int __init ill_acc_of_setup(void)
  76 +{
  77 +       struct platform_device *pdev;
  78 +       struct device_node *np;
  79 +       int irq;
  80 +
  81 +       /* somehow this driver breaks on RT5350 */
  82 +       if (of_machine_is_compatible("ralink,rt5350-soc"))
  83 +               return -EINVAL;
  84 +
  85 +       np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
  86 +       if (!np)
  87 +               return -EINVAL;
  88 +
  89 +       pdev = of_find_device_by_node(np);
  90 +       if (!pdev) {
  91 +               pr_err("%s: failed to lookup pdev\n", np->name);
  92 +               return -EINVAL;
  93 +       }
  94 +
  95 +       irq = irq_of_parse_and_map(np, 0);
  96 +        if (!irq) {
  97 +               dev_err(&pdev->dev, "failed to get irq\n");
  98 +               return -EINVAL;
  99 +       }
 100 +
 101 +       if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
 102 +               dev_err(&pdev->dev, "failed to request irq\n");
 103 +               return -EINVAL;
 104 +       }
 105 +
 106 +       rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
 107 +
 108 +       dev_info(&pdev->dev, "irq registered\n");
 109 +
 110 +       return 0;
 111 +}
 112 +
 113 +arch_initcall(ill_acc_of_setup);