1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2013 John Crispin <john@phrozen.org>
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/interrupt.h>
8*4882a593Smuzhiyun #include <linux/of_platform.h>
9*4882a593Smuzhiyun #include <linux/of_irq.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <asm/mach-ralink/ralink_regs.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #define REG_ILL_ACC_ADDR 0x10
14*4882a593Smuzhiyun #define REG_ILL_ACC_TYPE 0x14
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define ILL_INT_STATUS BIT(31)
17*4882a593Smuzhiyun #define ILL_ACC_WRITE BIT(30)
18*4882a593Smuzhiyun #define ILL_ACC_LEN_M 0xff
19*4882a593Smuzhiyun #define ILL_ACC_OFF_M 0xf
20*4882a593Smuzhiyun #define ILL_ACC_OFF_S 16
21*4882a593Smuzhiyun #define ILL_ACC_ID_M 0x7
22*4882a593Smuzhiyun #define ILL_ACC_ID_S 8
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun #define DRV_NAME "ill_acc"
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static const char * const ill_acc_ids[] = {
27*4882a593Smuzhiyun "cpu", "dma", "ppe", "pdma rx", "pdma tx", "pci/e", "wmac", "usb",
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
ill_acc_irq_handler(int irq,void * _priv)30*4882a593Smuzhiyun static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun struct device *dev = (struct device *) _priv;
33*4882a593Smuzhiyun u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
34*4882a593Smuzhiyun u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
37*4882a593Smuzhiyun (type & ILL_ACC_WRITE) ? ("write") : ("read"),
38*4882a593Smuzhiyun ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
39*4882a593Smuzhiyun addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
40*4882a593Smuzhiyun type & ILL_ACC_LEN_M);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return IRQ_HANDLED;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
ill_acc_of_setup(void)47*4882a593Smuzhiyun static int __init ill_acc_of_setup(void)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun struct platform_device *pdev;
50*4882a593Smuzhiyun struct device_node *np;
51*4882a593Smuzhiyun int irq;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun /* somehow this driver breaks on RT5350 */
54*4882a593Smuzhiyun if (of_machine_is_compatible("ralink,rt5350-soc"))
55*4882a593Smuzhiyun return -EINVAL;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
58*4882a593Smuzhiyun if (!np)
59*4882a593Smuzhiyun return -EINVAL;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun pdev = of_find_device_by_node(np);
62*4882a593Smuzhiyun if (!pdev) {
63*4882a593Smuzhiyun pr_err("%pOFn: failed to lookup pdev\n", np);
64*4882a593Smuzhiyun of_node_put(np);
65*4882a593Smuzhiyun return -EINVAL;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun irq = irq_of_parse_and_map(np, 0);
69*4882a593Smuzhiyun if (!irq) {
70*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to get irq\n");
71*4882a593Smuzhiyun put_device(&pdev->dev);
72*4882a593Smuzhiyun return -EINVAL;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
76*4882a593Smuzhiyun dev_err(&pdev->dev, "failed to request irq\n");
77*4882a593Smuzhiyun put_device(&pdev->dev);
78*4882a593Smuzhiyun return -EINVAL;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun dev_info(&pdev->dev, "irq registered\n");
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun return 0;
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun arch_initcall(ill_acc_of_setup);
89