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 return -EINVAL; 65 } 66 67 irq = irq_of_parse_and_map(np, 0); 68 of_node_put(np); 69 if (!irq) { 70 dev_err(&pdev->dev, "failed to get irq\n"); 71 put_device(&pdev->dev); 72 return -EINVAL; 73 } 74 75 if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) { 76 dev_err(&pdev->dev, "failed to request irq\n"); 77 put_device(&pdev->dev); 78 return -EINVAL; 79 } 80 81 rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE); 82 83 dev_info(&pdev->dev, "irq registered\n"); 84 85 return 0; 86 } 87 88 arch_initcall(ill_acc_of_setup); 89