From 69a5834d0a90588578df9689530fc8f3ab8ef59a Mon Sep 17 00:00:00 2001 From: John Crispin Date: Thu, 16 May 2013 23:28:23 +0200 Subject: [PATCH 53/79] MIPS: ralink: add illegal access driver Signed-off-by: John Crispin --- arch/mips/ralink/Makefile | 2 +- arch/mips/ralink/ill_acc.c | 87 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 88 insertions(+), 1 deletion(-) create mode 100644 arch/mips/ralink/ill_acc.c diff --git a/arch/mips/ralink/Makefile b/arch/mips/ralink/Makefile index 5fa6129..55a5bfc 100644 --- a/arch/mips/ralink/Makefile +++ b/arch/mips/ralink/Makefile @@ -6,7 +6,7 @@ # Copyright (C) 2009-2011 Gabor Juhos # Copyright (C) 2013 John Crispin -obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.o +obj-y := prom.o of.o reset.o clk.o irq.o pinmux.o timer.o ill_acc.o obj-$(CONFIG_SOC_RT288X) += rt288x.o obj-$(CONFIG_SOC_RT305X) += rt305x.o diff --git a/arch/mips/ralink/ill_acc.c b/arch/mips/ralink/ill_acc.c new file mode 100644 index 0000000..4a3f696 --- /dev/null +++ b/arch/mips/ralink/ill_acc.c @@ -0,0 +1,87 @@ +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Copyright (C) 2013 John Crispin + */ + +#include +#include +#include + +#include + +#define REG_ILL_ACC_ADDR 0x10 +#define REG_ILL_ACC_TYPE 0x14 + +#define ILL_INT_STATUS BIT(31) +#define ILL_ACC_WRITE BIT(30) +#define ILL_ACC_LEN_M 0xff +#define ILL_ACC_OFF_M 0xf +#define ILL_ACC_OFF_S 16 +#define ILL_ACC_ID_M 0x7 +#define ILL_ACC_ID_S 8 + +#define DRV_NAME "ill_acc" + +static const char *ill_acc_ids[] = { + "cpu", "dma", "ppe", "pdma rx","pdma tx", "pci/e", "wmac", "usb", +}; + +static irqreturn_t ill_acc_irq_handler(int irq, void *_priv) +{ + struct device *dev = (struct device *) _priv; + u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR); + u32 type = rt_memc_r32(REG_ILL_ACC_TYPE); + + dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n", + (type & ILL_ACC_WRITE) ? ("write") : ("read"), + ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M], + addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M, + type & ILL_ACC_LEN_M); + + rt_memc_w32(REG_ILL_ACC_TYPE, REG_ILL_ACC_TYPE); + + return IRQ_HANDLED; +} + +static int __init ill_acc_of_setup(void) +{ + struct platform_device *pdev; + struct device_node *np; + int irq; + + /* somehow this driver breaks on RT5350 */ + if (of_machine_is_compatible("ralink,rt5350-soc")) + return -EINVAL; + + np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc"); + if (!np) + return -EINVAL; + + pdev = of_find_device_by_node(np); + if (!pdev) { + pr_err("%s: failed to lookup pdev\n", np->name); + return -EINVAL; + } + + irq = irq_of_parse_and_map(np, 0); + if (!irq) { + dev_err(&pdev->dev, "failed to get irq\n"); + return -EINVAL; + } + + if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) { + dev_err(&pdev->dev, "failed to request irq\n"); + return -EINVAL; + } + + rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE); + + dev_info(&pdev->dev, "irq registered\n"); + + return 0; +} + +arch_initcall(ill_acc_of_setup); -- 1.7.10.4