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.h>
9 #include <linux/of_platform.h>
10 #include <linux/of_irq.h>
11 #include <linux/platform_device.h>
12
13 #include <asm/mach-ralink/ralink_regs.h>
14
15 #define REG_ILL_ACC_ADDR 0x10
16 #define REG_ILL_ACC_TYPE 0x14
17
18 #define ILL_INT_STATUS BIT(31)
19 #define ILL_ACC_WRITE BIT(30)
20 #define ILL_ACC_LEN_M 0xff
21 #define ILL_ACC_OFF_M 0xf
22 #define ILL_ACC_OFF_S 16
23 #define ILL_ACC_ID_M 0x7
24 #define ILL_ACC_ID_S 8
25
26 #define DRV_NAME "ill_acc"
27
28 static const char * const ill_acc_ids[] = {
29 "cpu", "dma", "ppe", "pdma rx", "pdma tx", "pci/e", "wmac", "usb",
30 };
31
ill_acc_irq_handler(int irq,void * _priv)32 static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
33 {
34 struct device *dev = (struct device *) _priv;
35 u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
36 u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
37
38 dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
39 (type & ILL_ACC_WRITE) ? ("write") : ("read"),
40 ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
41 addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
42 type & ILL_ACC_LEN_M);
43
44 rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
45
46 return IRQ_HANDLED;
47 }
48
ill_acc_of_setup(void)49 static int __init ill_acc_of_setup(void)
50 {
51 struct platform_device *pdev;
52 struct device_node *np;
53 int irq;
54
55 /* somehow this driver breaks on RT5350 */
56 if (of_machine_is_compatible("ralink,rt5350-soc"))
57 return -EINVAL;
58
59 np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
60 if (!np)
61 return -EINVAL;
62
63 pdev = of_find_device_by_node(np);
64 if (!pdev) {
65 pr_err("%pOFn: failed to lookup pdev\n", np);
66 of_node_put(np);
67 return -EINVAL;
68 }
69
70 irq = irq_of_parse_and_map(np, 0);
71 of_node_put(np);
72 if (!irq) {
73 dev_err(&pdev->dev, "failed to get irq\n");
74 put_device(&pdev->dev);
75 return -EINVAL;
76 }
77
78 if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
79 dev_err(&pdev->dev, "failed to request irq\n");
80 put_device(&pdev->dev);
81 return -EINVAL;
82 }
83
84 rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
85
86 dev_info(&pdev->dev, "irq registered\n");
87
88 return 0;
89 }
90
91 arch_initcall(ill_acc_of_setup);
92