// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2011-2012 Calxeda, Inc.
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/edac.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

#include "edac_module.h"

#define SR_CLR_SB_ECC_INTR      0x0
#define SR_CLR_DB_ECC_INTR      0x4

struct hb_l2_drvdata {
        void __iomem *base;
        int sb_irq;
        int db_irq;
};

static irqreturn_t highbank_l2_err_handler(int irq, void *dev_id)
{
        struct edac_device_ctl_info *dci = dev_id;
        struct hb_l2_drvdata *drvdata = dci->pvt_info;

        if (irq == drvdata->sb_irq) {
                writel(1, drvdata->base + SR_CLR_SB_ECC_INTR);
                edac_device_handle_ce(dci, 0, 0, dci->ctl_name);
        }
        if (irq == drvdata->db_irq) {
                writel(1, drvdata->base + SR_CLR_DB_ECC_INTR);
                edac_device_handle_ue(dci, 0, 0, dci->ctl_name);
        }

        return IRQ_HANDLED;
}

static const struct of_device_id hb_l2_err_of_match[] = {
        { .compatible = "calxeda,hb-sregs-l2-ecc", },
        {},
};
MODULE_DEVICE_TABLE(of, hb_l2_err_of_match);

static int highbank_l2_err_probe(struct platform_device *pdev)
{
        const struct of_device_id *id;
        struct edac_device_ctl_info *dci;
        struct hb_l2_drvdata *drvdata;
        struct resource *r;
        int res = 0;

        dci = edac_device_alloc_ctl_info(sizeof(*drvdata), "cpu",
                                         1, "L", 1, 2, 0);
        if (!dci)
                return -ENOMEM;

        drvdata = dci->pvt_info;
        dci->dev = &pdev->dev;
        platform_set_drvdata(pdev, dci);

        if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
                return -ENOMEM;

        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!r) {
                dev_err(&pdev->dev, "Unable to get mem resource\n");
                res = -ENODEV;
                goto err;
        }

        if (!devm_request_mem_region(&pdev->dev, r->start,
                                     resource_size(r), dev_name(&pdev->dev))) {
                dev_err(&pdev->dev, "Error while requesting mem region\n");
                res = -EBUSY;
                goto err;
        }

        drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
        if (!drvdata->base) {
                dev_err(&pdev->dev, "Unable to map regs\n");
                res = -ENOMEM;
                goto err;
        }

        id = of_match_device(hb_l2_err_of_match, &pdev->dev);
        dci->mod_name = pdev->dev.driver->name;
        dci->ctl_name = id ? id->compatible : "unknown";
        dci->dev_name = dev_name(&pdev->dev);

        if (edac_device_add_device(dci))
                goto err;

        drvdata->db_irq = platform_get_irq(pdev, 0);
        res = devm_request_irq(&pdev->dev, drvdata->db_irq,
                               highbank_l2_err_handler,
                               0, dev_name(&pdev->dev), dci);
        if (res < 0)
                goto err2;

        drvdata->sb_irq = platform_get_irq(pdev, 1);
        res = devm_request_irq(&pdev->dev, drvdata->sb_irq,
                               highbank_l2_err_handler,
                               0, dev_name(&pdev->dev), dci);
        if (res < 0)
                goto err2;

        devres_close_group(&pdev->dev, NULL);
        return 0;
err2:
        edac_device_del_device(&pdev->dev);
err:
        devres_release_group(&pdev->dev, NULL);
        edac_device_free_ctl_info(dci);
        return res;
}

static void highbank_l2_err_remove(struct platform_device *pdev)
{
        struct edac_device_ctl_info *dci = platform_get_drvdata(pdev);

        edac_device_del_device(&pdev->dev);
        edac_device_free_ctl_info(dci);
}

static struct platform_driver highbank_l2_edac_driver = {
        .probe = highbank_l2_err_probe,
        .remove = highbank_l2_err_remove,
        .driver = {
                .name = "hb_l2_edac",
                .of_match_table = hb_l2_err_of_match,
        },
};

module_platform_driver(highbank_l2_edac_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Calxeda, Inc.");
MODULE_DESCRIPTION("EDAC Driver for Calxeda Highbank L2 Cache");