Avoid beyond bounds copy while caching ACL

[zen-stable.git] / drivers / scsi / arm / oak.c

/*
 * Oak Generic NCR5380 driver
 *
 * Copyright 1995-2002, Russell King
 */

#include <linux/module.h>
#include <linux/signal.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/init.h>

#include <asm/ecard.h>
#include <asm/io.h>
#include <asm/system.h>

#include "../scsi.h"
#include <scsi/scsi_host.h>

#define AUTOSENSE
/*#define PSEUDO_DMA*/

#define OAKSCSI_PUBLIC_RELEASE 1

#define priv(host)                      ((struct NCR5380_hostdata *)(host)->hostdata)
#define NCR5380_local_declare()         void __iomem *_base
#define NCR5380_setup(host)             _base = priv(host)->base

#define NCR5380_read(reg)               readb(_base + ((reg) << 2))
#define NCR5380_write(reg, value)       writeb(value, _base + ((reg) << 2))
#define NCR5380_intr                    oakscsi_intr
#define NCR5380_queue_command           oakscsi_queue_command
#define NCR5380_proc_info               oakscsi_proc_info

#define NCR5380_implementation_fields   \
        void __iomem *base

#define BOARD_NORMAL    0
#define BOARD_NCR53C400 1

#include "../NCR5380.h"

#undef START_DMA_INITIATOR_RECEIVE_REG
#define START_DMA_INITIATOR_RECEIVE_REG (128 + 7)

const char * oakscsi_info (struct Scsi_Host *spnt)
{
        return "";
}

#define STAT    ((128 + 16) << 2)
#define DATA    ((128 + 8) << 2)

static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *addr,
              int len)
{
  void __iomem *base = priv(instance)->base;

printk("writing %p len %d\n",addr, len);
  if(!len) return -1;

  while(1)
  {
    int status;
    while (((status = readw(base + STAT)) & 0x100)==0);
  }
}

static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *addr,
              int len)
{
  void __iomem *base = priv(instance)->base;
printk("reading %p len %d\n", addr, len);
  while(len > 0)
  {
    unsigned int status, timeout;
    unsigned long b;
    
    timeout = 0x01FFFFFF;
    
    while (((status = readw(base + STAT)) & 0x100)==0)
    {
      timeout--;
      if(status & 0x200 || !timeout)
      {
        printk("status = %08X\n", status);
        return 1;
      }
    }

    if(len >= 128)
    {
      readsw(base + DATA, addr, 128);
      addr += 128;
      len -= 128;
    }
    else
    {
      b = (unsigned long) readw(base + DATA);
      *addr ++ = b;
      len -= 1;
      if(len)
        *addr ++ = b>>8;
      len -= 1;
    }
  }
  return 0;
}

#undef STAT
#undef DATA

#include "../NCR5380.c"

static struct scsi_host_template oakscsi_template = {
        .module                 = THIS_MODULE,
        .proc_info              = oakscsi_proc_info,
        .name                   = "Oak 16-bit SCSI",
        .info                   = oakscsi_info,
        .queuecommand           = oakscsi_queue_command,
        .eh_abort_handler       = NCR5380_abort,
        .eh_bus_reset_handler   = NCR5380_bus_reset,
        .can_queue              = 16,
        .this_id                = 7,
        .sg_tablesize           = SG_ALL,
        .cmd_per_lun            = 2,
        .use_clustering         = DISABLE_CLUSTERING,
        .proc_name              = "oakscsi",
};

static int __devinit
oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
{
        struct Scsi_Host *host;
        int ret = -ENOMEM;

        ret = ecard_request_resources(ec);
        if (ret)
                goto out;

        host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
        if (!host) {
                ret = -ENOMEM;
                goto release;
        }

        priv(host)->base = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
                                   ecard_resource_len(ec, ECARD_RES_MEMC));
        if (!priv(host)->base) {
                ret = -ENOMEM;
                goto unreg;
        }

        host->irq = IRQ_NONE;
        host->n_io_port = 255;

        NCR5380_init(host, 0);

        printk("scsi%d: at port 0x%08lx irqs disabled",
                host->host_no, host->io_port);
        printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
                host->can_queue, host->cmd_per_lun, OAKSCSI_PUBLIC_RELEASE);
        printk("\nscsi%d:", host->host_no);
        NCR5380_print_options(host);
        printk("\n");

        ret = scsi_add_host(host, &ec->dev);
        if (ret)
                goto out_unmap;

        scsi_scan_host(host);
        goto out;

 out_unmap:
        iounmap(priv(host)->base);
 unreg:
        scsi_host_put(host);
 release:
        ecard_release_resources(ec);
 out:
        return ret;
}

static void __devexit oakscsi_remove(struct expansion_card *ec)
{
        struct Scsi_Host *host = ecard_get_drvdata(ec);

        ecard_set_drvdata(ec, NULL);
        scsi_remove_host(host);

        NCR5380_exit(host);
        iounmap(priv(host)->base);
        scsi_host_put(host);
        ecard_release_resources(ec);
}

static const struct ecard_id oakscsi_cids[] = {
        { MANU_OAK, PROD_OAK_SCSI },
        { 0xffff, 0xffff }
};

static struct ecard_driver oakscsi_driver = {
        .probe          = oakscsi_probe,
        .remove         = __devexit_p(oakscsi_remove),
        .id_table       = oakscsi_cids,
        .drv = {
                .name           = "oakscsi",
        },
};

static int __init oakscsi_init(void)
{
        return ecard_register_driver(&oakscsi_driver);
}

static void __exit oakscsi_exit(void)
{
        ecard_remove_driver(&oakscsi_driver);
}

module_init(oakscsi_init);
module_exit(oakscsi_exit);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Oak SCSI driver");
MODULE_LICENSE("GPL");