linux-imx

/* GD ROM driver for the SEGA Dreamcast

 * copyright Adrian McMenamin, 2007

 * With thanks to Marcus Comstedt and Nathan Keynes

 * for work in reversing PIO and DMA

 *

 * 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.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/init.h>

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/slab.h>

#include <linux/dma-mapping.h>

#include <linux/cdrom.h>

#include <linux/genhd.h>

#include <linux/bio.h>

#include <linux/blk-mq.h>

#include <linux/interrupt.h>

#include <linux/device.h>

#include <linux/mutex.h>

#include <linux/wait.h>

#include <linux/platform_device.h>

#include <scsi/scsi.h>

#include <asm/io.h>

#include <asm/dma.h>

#include <asm/delay.h>

#include <mach/dma.h>

#include <mach/sysasic.h>

​

#define GDROM_DEV_NAME "gdrom"

#define GD_SESSION_OFFSET 150

​

/* GD Rom commands */

#define GDROM_COM_SOFTRESET 0x08

#define GDROM_COM_EXECDIAG 0x90

#define GDROM_COM_PACKET 0xA0

#define GDROM_COM_IDDEV 0xA1

​

/* GD Rom registers */

#define GDROM_BASE_REG          0xA05F7000

#define GDROM_ALTSTATUS_REG     (GDROM_BASE_REG + 0x18)

#define GDROM_DATA_REG          (GDROM_BASE_REG + 0x80)

#define GDROM_ERROR_REG     (GDROM_BASE_REG + 0x84)

#define GDROM_INTSEC_REG        (GDROM_BASE_REG + 0x88)

#define GDROM_SECNUM_REG        (GDROM_BASE_REG + 0x8C)

#define GDROM_BCL_REG           (GDROM_BASE_REG + 0x90)

#define GDROM_BCH_REG           (GDROM_BASE_REG + 0x94)

#define GDROM_DSEL_REG          (GDROM_BASE_REG + 0x98)

#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)

#define GDROM_RESET_REG     (GDROM_BASE_REG + 0x4E4)

​

#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)

#define GDROM_DMA_LENGTH_REG        (GDROM_BASE_REG + 0x408)

#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)

#define GDROM_DMA_ENABLE_REG        (GDROM_BASE_REG + 0x414)

#define GDROM_DMA_STATUS_REG        (GDROM_BASE_REG + 0x418)

#define GDROM_DMA_WAIT_REG      (GDROM_BASE_REG + 0x4A0)

#define GDROM_DMA_ACCESS_CTRL_REG   (GDROM_BASE_REG + 0x4B8)

​

#define GDROM_HARD_SECTOR   2048

#define BLOCK_LAYER_SECTOR  512

#define GD_TO_BLK       4

​

#define GDROM_DEFAULT_TIMEOUT   (HZ * 7)

​

static DEFINE_MUTEX(gdrom_mutex);

static const struct {

    int sense_key;

    const char * const text;

} sense_texts[] = {

    {NO_SENSE, "OK"},

    {RECOVERED_ERROR, "Recovered from error"},

    {NOT_READY, "Device not ready"},

    {MEDIUM_ERROR, "Disk not ready"},

    {HARDWARE_ERROR, "Hardware error"},