// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (C) 2013 John Crispin <john@phrozen.org>
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*/
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#include <linux/interrupt.h>
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#include <linux/of_platform.h>
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#include <linux/of_irq.h>
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#include <asm/mach-ralink/ralink_regs.h>
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#define REG_ILL_ACC_ADDR 0x10
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#define REG_ILL_ACC_TYPE 0x14
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#define ILL_INT_STATUS BIT(31)
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#define ILL_ACC_WRITE BIT(30)
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#define ILL_ACC_LEN_M 0xff
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#define ILL_ACC_OFF_M 0xf
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#define ILL_ACC_OFF_S 16
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#define ILL_ACC_ID_M 0x7
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#define ILL_ACC_ID_S 8
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#define DRV_NAME "ill_acc"
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static const char * const ill_acc_ids[] = {
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"cpu", "dma", "ppe", "pdma rx", "pdma tx", "pci/e", "wmac", "usb",
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};
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static irqreturn_t ill_acc_irq_handler(int irq, void *_priv)
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{
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struct device *dev = (struct device *) _priv;
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u32 addr = rt_memc_r32(REG_ILL_ACC_ADDR);
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u32 type = rt_memc_r32(REG_ILL_ACC_TYPE);
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dev_err(dev, "illegal %s access from %s - addr:0x%08x offset:%d len:%d\n",
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(type & ILL_ACC_WRITE) ? ("write") : ("read"),
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ill_acc_ids[(type >> ILL_ACC_ID_S) & ILL_ACC_ID_M],
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addr, (type >> ILL_ACC_OFF_S) & ILL_ACC_OFF_M,
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type & ILL_ACC_LEN_M);
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rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
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return IRQ_HANDLED;
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}
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static int __init ill_acc_of_setup(void)
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{
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struct platform_device *pdev;
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struct device_node *np;
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int irq;
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/* somehow this driver breaks on RT5350 */
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if (of_machine_is_compatible("ralink,rt5350-soc"))
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return -EINVAL;
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np = of_find_compatible_node(NULL, NULL, "ralink,rt3050-memc");
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if (!np)
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return -EINVAL;
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pdev = of_find_device_by_node(np);
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if (!pdev) {
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pr_err("%pOFn: failed to lookup pdev\n", np);
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of_node_put(np);
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return -EINVAL;
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}
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irq = irq_of_parse_and_map(np, 0);
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if (!irq) {
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dev_err(&pdev->dev, "failed to get irq\n");
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put_device(&pdev->dev);
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return -EINVAL;
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}
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if (request_irq(irq, ill_acc_irq_handler, 0, "ill_acc", &pdev->dev)) {
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dev_err(&pdev->dev, "failed to request irq\n");
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put_device(&pdev->dev);
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return -EINVAL;
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}
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rt_memc_w32(ILL_INT_STATUS, REG_ILL_ACC_TYPE);
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dev_info(&pdev->dev, "irq registered\n");
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return 0;
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}
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arch_initcall(ill_acc_of_setup);
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