arch/mips/ralink/ill_acc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (C) 2013 John Crispin <john@phrozen.org>
   5  */
   6
   7 #include <linux/interrupt.h>
   8 #include <linux/of_platform.h>
   9 #include <linux/of_irq.h>
  10
  11 #include <asm/mach-ralink/ralink_regs.h>
  12
  13 #define REG_ILL_ACC_ADDR        0x10
  14 #define REG_ILL_ACC_TYPE        0x14
  15
  16 #define ILL_INT_STATUS          BIT(31)
  17 #define ILL_ACC_WRITE           BIT(30)
  18 #define ILL_ACC_LEN_M           0xff
  19 #define ILL_ACC_OFF_M           0xf
  20 #define ILL_ACC_OFF_S           16
  21 #define ILL_ACC_ID_M            0x7
  22 #define ILL_ACC_ID_S            8
  23
  24 #define DRV_NAME                "ill_acc"
  25
  26 static const char * const ill_acc_ids[] = {
  27         "cpu", "dma", "ppe", "pdma rx", "pdma tx", "pci/e", "wmac", "usb",
  28 };
  29
  30 static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
  31 {
  32         struct device *dev = (struct device *) _priv;
  33         u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
  34         u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
  35
  36         dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
  37                 (type & ILL_ACC_WRITE) ? ("write") : ("read"),
  38                 ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
  39                 addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
  40                 type & ILL_ACC_LEN_M);
  41
  42         rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
  43
  44         return IRQ_HANDLED;
  45 }
  46
  47 static int __init ill_acc_of_setup(void)
  48 {
  49         struct platform_device *pdev;
  50         struct device_node *np;
  51         int irq;
  52
  53         /* somehow this driver breaks on RT5350 */
  54         if (of_machine_is_compatible("ralink,rt5350-soc"))
  55                 return -EINVAL;
  56
  57         np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
  58         if (!np)
  59                 return -EINVAL;
  60
  61         pdev = of_find_device_by_node(np);
  62         if (!pdev) {
  63                 pr_err("%pOFn: failed to lookup pdev\n", np);
  64                 of_node_put(np);
  65                 return -EINVAL;
  66         }
  67
  68         irq = irq_of_parse_and_map(np, 0);
  69         of_node_put(np);
  70         if (!irq) {
  71                 dev_err(&pdev->dev, "failed to get irq\n");
  72                 put_device(&pdev->dev);
  73                 return -EINVAL;
  74         }
  75
  76         if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
  77                 dev_err(&pdev->dev, "failed to request irq\n");
  78                 put_device(&pdev->dev);
  79                 return -EINVAL;
  80         }
  81
  82         rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
  83
  84         dev_info(&pdev->dev, "irq registered\n");
  85
  86         return 0;
  87 }
  88
  89 arch_initcall(ill_acc_of_setup);