xc.c

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/*
 * arch/arm/mach-netx/xc.c
 *
 * Copyright (c) 2005 Sascha Hauer <[email protected]>, Pengutronix
 *
 * 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.
 *
 * 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/init.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/export.h>

#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/netx-regs.h>

#include <mach/xc.h>

static DEFINE_MUTEX(xc_lock);

static int xc_in_use = 0;

struct fw_desc {
    unsigned int ofs;
    unsigned int size;
    unsigned int patch_ofs;
    unsigned int patch_entries;
};

struct fw_header {
    unsigned int magic;
    unsigned int type;
    unsigned int version;
    unsigned int reserved[5];
    struct fw_desc fw_desc[3];
} __attribute__ ((packed));

int xc_stop(struct xc *x)
{
    writel(RPU_HOLD_PC, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
    writel(TPU_HOLD_PC, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
    writel(XPU_HOLD_PC, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
    return 0;
}

int xc_start(struct xc *x)
{
    writel(0, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
    writel(0, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
    writel(0, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
    return 0;
}

int xc_running(struct xc *x)
{
    return (readl(x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS) & RPU_HOLD_PC)
        || (readl(x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS) & TPU_HOLD_PC)
        || (readl(x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS) & XPU_HOLD_PC) ?
        0 : 1;
}

int xc_reset(struct xc *x)
{
    writel(0, x->xpec_base + NETX_XPEC_PC_OFS);
    return 0;
}

static int xc_check_ptr(struct xc *x, unsigned long adr, unsigned int size)
{
    if (adr >= NETX_PA_XMAC(x->no) &&
        adr + size < NETX_PA_XMAC(x->no) + XMAC_MEM_SIZE)
        return 0;

    if (adr >= NETX_PA_XPEC(x->no) &&
        adr + size < NETX_PA_XPEC(x->no) + XPEC_MEM_SIZE)
        return 0;

    dev_err(x->dev, "Illegal pointer in firmware found. aborting\n");

    return -1;
}

static int xc_patch(struct xc *x, const void *patch, int count)
{
    unsigned int val, adr;
    const unsigned int *data = patch;

    int i;
    for (i = 0; i < count; i++) {
        adr = *data++;
        val = *data++;
        if (xc_check_ptr(x, adr, 4) < 0)
            return -EINVAL;

        writel(val, (void __iomem *)io_p2v(adr));
    }
    return 0;
}

int xc_request_firmware(struct xc *x)
{
    int ret;
    char name[16];
    const struct firmware *fw;
    struct fw_header *head;
    unsigned int size;
    int i;
    const void *src;
    unsigned long dst;

    sprintf(name, "xc%d.bin", x->no);

    ret = request_firmware(&fw, name, x->dev);

    if (ret < 0) {
        dev_err(x->dev, "request_firmware failed\n");
        return ret;
    }

    head = (struct fw_header *)fw->data;
    if (head->magic != 0x4e657458) {
        if (head->magic == 0x5874654e) {
            dev_err(x->dev,
                "firmware magic is 'XteN'. Endianess problems?\n");
            ret = -ENODEV;
            goto exit_release_firmware;
        }
        dev_err(x->dev, "unrecognized firmware magic 0x%08x\n",
            head->magic);
        ret = -ENODEV;
        goto exit_release_firmware;
    }

    x->type = head->type;
    x->version = head->version;

    ret = -EINVAL;

    for (i = 0; i < 3; i++) {
        src = fw->data + head->fw_desc[i].ofs;
        dst = *(unsigned int *)src;
        src += sizeof (unsigned int);
        size = head->fw_desc[i].size - sizeof (unsigned int);

        if (xc_check_ptr(x, dst, size))
            goto exit_release_firmware;

        memcpy((void *)io_p2v(dst), src, size);

        src = fw->data + head->fw_desc[i].patch_ofs;
        size = head->fw_desc[i].patch_entries;
        ret = xc_patch(x, src, size);
        if (ret < 0)
            goto exit_release_firmware;
    }

    ret = 0;

      exit_release_firmware:
    release_firmware(fw);

    return ret;
}

struct xc *request_xc(int xcno, struct device *dev)
{
    struct xc *x = NULL;

    mutex_lock(&xc_lock);

    if (xcno > 3)
        goto exit;
    if (xc_in_use & (1 << xcno))
        goto exit;

    x = kmalloc(sizeof (struct xc), GFP_KERNEL);
    if (!x)
        goto exit;

    if (!request_mem_region
        (NETX_PA_XPEC(xcno), XPEC_MEM_SIZE, kobject_name(&dev->kobj)))
        goto exit_free;

    if (!request_mem_region
        (NETX_PA_XMAC(xcno), XMAC_MEM_SIZE, kobject_name(&dev->kobj)))
        goto exit_release_1;

    if (!request_mem_region
        (SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE, kobject_name(&dev->kobj)))
        goto exit_release_2;

    x->xpec_base = (void * __iomem)io_p2v(NETX_PA_XPEC(xcno));
    x->xmac_base = (void * __iomem)io_p2v(NETX_PA_XMAC(xcno));
    x->sram_base = ioremap(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
    if (!x->sram_base)
        goto exit_release_3;

    x->irq = NETX_IRQ_XPEC(xcno);

    x->no = xcno;
    x->dev = dev;

    xc_in_use |= (1 << xcno);

    goto exit;

      exit_release_3:
    release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
      exit_release_2:
    release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
      exit_release_1:
    release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
      exit_free:
    kfree(x);
    x = NULL;
      exit:
    mutex_unlock(&xc_lock);
    return x;
}

void free_xc(struct xc *x)
{
    int xcno = x->no;

    mutex_lock(&xc_lock);

    iounmap(x->sram_base);
    release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
    release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
    release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
    xc_in_use &= ~(1 << x->no);
    kfree(x);

    mutex_unlock(&xc_lock);
}

EXPORT_SYMBOL(free_xc);
EXPORT_SYMBOL(request_xc);
EXPORT_SYMBOL(xc_request_firmware);
EXPORT_SYMBOL(xc_reset);
EXPORT_SYMBOL(xc_running);
EXPORT_SYMBOL(xc_start);
EXPORT_SYMBOL(xc_stop);