omap_l3_smx.c

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/*
 * OMAP3XXX L3 Interconnect Driver
 *
 * Copyright (C) 2011 Texas Corporation
 *  Felipe Balbi <[email protected]>
 *  Santosh Shilimkar <[email protected]>
 *  Sricharan <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include "omap_l3_smx.h"

static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
{
    return __raw_readll(base + reg);
}

static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
{
    __raw_writell(value, base + reg);
}

static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
{
    return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
}

static inline u32 omap3_l3_decode_addr(u64 error_addr)
{
    return error_addr & 0xffffffff;
}

static inline unsigned omap3_l3_decode_cmd(u64 error)
{
    return (error & 0x07) >> L3_ERROR_LOG_CMD;
}

static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
{
    return (error & 0xff00) >> L3_ERROR_LOG_INITID;
}

static inline unsigned omap3_l3_decode_req_info(u64 error)
{
    return (error >> 32) & 0xffff;
}

static char *omap3_l3_code_string(u8 code)
{
    switch (code) {
    case OMAP_L3_CODE_NOERROR:
        return "No Error";
    case OMAP_L3_CODE_UNSUP_CMD:
        return "Unsupported Command";
    case OMAP_L3_CODE_ADDR_HOLE:
        return "Address Hole";
    case OMAP_L3_CODE_PROTECT_VIOLATION:
        return "Protection Violation";
    case OMAP_L3_CODE_IN_BAND_ERR:
        return "In-band Error";
    case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
        return "Request Timeout Not Accepted";
    case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
        return "Request Timeout, no response";
    default:
        return "UNKNOWN error";
    }
}

static char *omap3_l3_initiator_string(u8 initid)
{
    switch (initid) {
    case OMAP_L3_LCD:
        return "LCD";
    case OMAP_L3_SAD2D:
        return "SAD2D";
    case OMAP_L3_IA_MPU_SS_1:
    case OMAP_L3_IA_MPU_SS_2:
    case OMAP_L3_IA_MPU_SS_3:
    case OMAP_L3_IA_MPU_SS_4:
    case OMAP_L3_IA_MPU_SS_5:
        return "MPU";
    case OMAP_L3_IA_IVA_SS_1:
    case OMAP_L3_IA_IVA_SS_2:
    case OMAP_L3_IA_IVA_SS_3:
        return "IVA_SS";
    case OMAP_L3_IA_IVA_SS_DMA_1:
    case OMAP_L3_IA_IVA_SS_DMA_2:
    case OMAP_L3_IA_IVA_SS_DMA_3:
    case OMAP_L3_IA_IVA_SS_DMA_4:
    case OMAP_L3_IA_IVA_SS_DMA_5:
    case OMAP_L3_IA_IVA_SS_DMA_6:
        return "IVA_SS_DMA";
    case OMAP_L3_IA_SGX:
        return "SGX";
    case OMAP_L3_IA_CAM_1:
    case OMAP_L3_IA_CAM_2:
    case OMAP_L3_IA_CAM_3:
        return "CAM";
    case OMAP_L3_IA_DAP:
        return "DAP";
    case OMAP_L3_SDMA_WR_1:
    case OMAP_L3_SDMA_WR_2:
        return "SDMA_WR";
    case OMAP_L3_SDMA_RD_1:
    case OMAP_L3_SDMA_RD_2:
    case OMAP_L3_SDMA_RD_3:
    case OMAP_L3_SDMA_RD_4:
        return "SDMA_RD";
    case OMAP_L3_USBOTG:
        return "USB_OTG";
    case OMAP_L3_USBHOST:
        return "USB_HOST";
    default:
        return "UNKNOWN Initiator";
    }
}

/*
 * omap3_l3_block_irq - handles a register block's irq
 * @l3: struct omap3_l3 *
 * @base: register block base address
 * @error: L3_ERROR_LOG register of our block
 *
 * Called in hard-irq context. Caller should take care of locking
 *
 * OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
 * Analysis Sequence, we are following that sequence here, please
 * refer to that Figure for more information on the subject.
 */
static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
                    u64 error, int error_addr)
{
    u8 code = omap3_l3_decode_error_code(error);
    u8 initid = omap3_l3_decode_initid(error);
    u8 multi = error & L3_ERROR_LOG_MULTI;
    u32 address = omap3_l3_decode_addr(error_addr);

    pr_err("%s seen by %s %s at address %x\n",
            omap3_l3_code_string(code),
            omap3_l3_initiator_string(initid),
            multi ? "Multiple Errors" : "", address);
    WARN_ON(1);

    return IRQ_HANDLED;
}

static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
{
    struct omap3_l3 *l3 = _l3;
    u64 status, clear;
    u64 error;
    u64 error_addr;
    u64 err_source = 0;
    void __iomem *base;
    int int_type;
    irqreturn_t ret = IRQ_NONE;

    int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
    if (!int_type) {
        status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
        /*
         * if we have a timeout error, there's nothing we can
         * do besides rebooting the board. So let's BUG on any
         * of such errors and handle the others. timeout error
         * is severe and not expected to occur.
         */
        BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
    } else {
        status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
        /* No timeout error for debug sources */
    }

    /* identify the error source */
    err_source = __ffs(status);

    base = l3->rt + omap3_l3_bases[int_type][err_source];
    error = omap3_l3_readll(base, L3_ERROR_LOG);
    if (error) {
        error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
        ret |= omap3_l3_block_irq(l3, error, error_addr);
    }

    /* Clear the status register */
    clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
        L3_AGENT_STATUS_CLEAR_TA;
    omap3_l3_writell(base, L3_AGENT_STATUS, clear);

    /* clear the error log register */
    omap3_l3_writell(base, L3_ERROR_LOG, error);

    return ret;
}

static int __init omap3_l3_probe(struct platform_device *pdev)
{
    struct omap3_l3 *l3;
    struct resource *res;
    int ret;

    l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
    if (!l3)
        return -ENOMEM;

    platform_set_drvdata(pdev, l3);

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        dev_err(&pdev->dev, "couldn't find resource\n");
        ret = -ENODEV;
        goto err0;
    }
    l3->rt = ioremap(res->start, resource_size(res));
    if (!l3->rt) {
        dev_err(&pdev->dev, "ioremap failed\n");
        ret = -ENOMEM;
        goto err0;
    }

    l3->debug_irq = platform_get_irq(pdev, 0);
    ret = request_irq(l3->debug_irq, omap3_l3_app_irq,
        IRQF_DISABLED | IRQF_TRIGGER_RISING,
        "l3-debug-irq", l3);
    if (ret) {
        dev_err(&pdev->dev, "couldn't request debug irq\n");
        goto err1;
    }

    l3->app_irq = platform_get_irq(pdev, 1);
    ret = request_irq(l3->app_irq, omap3_l3_app_irq,
        IRQF_DISABLED | IRQF_TRIGGER_RISING,
        "l3-app-irq", l3);
    if (ret) {
        dev_err(&pdev->dev, "couldn't request app irq\n");
        goto err2;
    }

    return 0;

err2:
    free_irq(l3->debug_irq, l3);
err1:
    iounmap(l3->rt);
err0:
    kfree(l3);
    return ret;
}

static int __exit omap3_l3_remove(struct platform_device *pdev)
{
    struct omap3_l3         *l3 = platform_get_drvdata(pdev);

    free_irq(l3->app_irq, l3);
    free_irq(l3->debug_irq, l3);
    iounmap(l3->rt);
    kfree(l3);

    return 0;
}

static struct platform_driver omap3_l3_driver = {
    .remove         = __exit_p(omap3_l3_remove),
    .driver         = {
    .name   = "omap_l3_smx",
    },
};

static int __init omap3_l3_init(void)
{
    return platform_driver_probe(&omap3_l3_driver, omap3_l3_probe);
}
postcore_initcall_sync(omap3_l3_init);

static void __exit omap3_l3_exit(void)
{
    platform_driver_unregister(&omap3_l3_driver);
}
module_exit(omap3_l3_exit);