Logo Search packages:      
Sourcecode: linux version File versions  Download package

xc.c

/*
 * arch/arm/mach-netx/xc.c
 *
 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, 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 <asm/io.h>
#include <asm/hardware.h>
#include <asm/arch/netx-regs.h>

#include <asm/arch/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, void *patch, int count)
{
      unsigned int val, adr;
      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;
      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);

Generated by  Doxygen 1.6.0   Back to index