Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (197 commits)
  sh: add spi header and r2d platform data V3
  sh: update r7780rp interrupt code
  sh: remove consistent alloc stuff from the machine vector
  sh: use declared coherent memory for dreamcast pci ethernet adapter
  sh: declared coherent memory support V2
  sh: Add support for SDK7780 board.
  sh: constify function pointer tables
  sh: Kill off -traditional for linker script.
  cdrom: Add support for Sega Dreamcast GD-ROM.
  sh: Kill off hs7751rvoip reference from arch/sh/Kconfig.
  sh: Drop r7780rp_defconfig, use r7780mp_defconfig as kbuild default.
  sh: Kill off dead HS771RVoIP board support.
  sh: r7785rp: Fix up DECLARE_INTC_DESC() arg mismatch.
  sh: r7785rp: Hook up the rest of the HL7785 FPGA IRQ vectors.
  sh: r2d - enable sm501 usb host function
  sh: remove voyagergx
  sh: r2d - add lcd planel timings to sm501 platform data
  sh: Add OHCI and UDC platform devices for SH7720.
  sh: intc - remove default interrupt priority tables
  sh: Correct pte size mismatch for X2 TLB.
  ...

2 files changed, 868 insertions, 0 deletions

diff --git a/drivers/cdrom/Makefile b/drivers/cdrom/Makefile
index 774c180a4e11..ecf85fda0fc1 100644
--- a/drivers/cdrom/Makefile
+++ b/drivers/cdrom/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_PARIDE_PCD)	+=		cdrom.o
 obj-$(CONFIG_CDROM_PKTCDVD)     +=              cdrom.o
 
 obj-$(CONFIG_VIOCD)             += viocd.o      cdrom.o
+obj-$(CONFIG_GDROM)             += gdrom.o      cdrom.o
diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
new file mode 100644
index 000000000000..4e2bbcccc064
--- /dev/null
+++ b/drivers/cdrom/gdrom.c
@@ -0,0 +1,867 @@
+/* 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.
+ *
+ */
+
+#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/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <asm/mach/dma.h>
+#include <asm/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 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"},
+        {ILLEGAL_REQUEST, "Command has failed"},
+        {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
+        {DATA_PROTECT, "Data protection error"},
+        {ABORTED_COMMAND, "Command aborted"},
+};
+
+static struct platform_device *pd;
+static int gdrom_major;
+static DECLARE_WAIT_QUEUE_HEAD(command_queue);
+static DECLARE_WAIT_QUEUE_HEAD(request_queue);
+
+static DEFINE_SPINLOCK(gdrom_lock);
+static void gdrom_readdisk_dma(struct work_struct *work);
+static DECLARE_WORK(work, gdrom_readdisk_dma);
+static LIST_HEAD(gdrom_deferred);
+
+struct gdromtoc {
+        unsigned int entry[99];
+        unsigned int first, last;
+        unsigned int leadout;
+};
+
+static struct gdrom_unit {
+        struct gendisk *disk;
+        struct cdrom_device_info *cd_info;
+        int status;
+        int pending;
+        int transfer;
+        char disk_type;
+        struct gdromtoc *toc;
+        struct request_queue *gdrom_rq;
+} gd;
+
+struct gdrom_id {
+        char mid;
+        char modid;
+        char verid;
+        char padA[13];
+        char mname[16];
+        char modname[16];
+        char firmver[16];
+        char padB[16];
+};
+
+static int gdrom_getsense(short *bufstring);
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+        struct packet_command *command);
+static int gdrom_hardreset(struct cdrom_device_info *cd_info);
+
+static bool gdrom_is_busy(void)
+{
+        return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
+}
+
+static bool gdrom_data_request(void)
+{
+        return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
+}
+
+static bool gdrom_wait_clrbusy(void)
+{
+        unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+        while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
+                (time_before(jiffies, timeout)))
+                cpu_relax();
+        return time_before(jiffies, timeout + 1);
+}
+
+static bool gdrom_wait_busy_sleeps(void)
+{
+        unsigned long timeout;
+        /* Wait to get busy first */
+        timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+        while (!gdrom_is_busy() && time_before(jiffies, timeout))
+                cpu_relax();
+        /* Now wait for busy to clear */
+        return gdrom_wait_clrbusy();
+}
+
+static void gdrom_identifydevice(void *buf)
+{
+        int c;
+        short *data = buf;
+        /* If the device won't clear it has probably
+        * been hit by a serious failure - but we'll
+        * try to return a sense key even so */
+        if (!gdrom_wait_clrbusy()) {
+                gdrom_getsense(NULL);
+                return;
+        }
+        ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
+        if (!gdrom_wait_busy_sleeps()) {
+                gdrom_getsense(NULL);
+                return;
+        }
+        /* now read in the data */
+        for (c = 0; c < 40; c++)
+                data[c] = ctrl_inw(GDROM_DATA_REG);
+}
+
+static void gdrom_spicommand(void *spi_string, int buflen)
+{
+        short *cmd = spi_string;
+        unsigned long timeout;
+
+        /* ensure IRQ_WAIT is set */
+        ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
+        /* specify how many bytes we expect back */
+        ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
+        ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
+        /* other parameters */
+        ctrl_outb(0, GDROM_INTSEC_REG);
+        ctrl_outb(0, GDROM_SECNUM_REG);
+        ctrl_outb(0, GDROM_ERROR_REG);
+        /* Wait until we can go */
+        if (!gdrom_wait_clrbusy()) {
+                gdrom_getsense(NULL);
+                return;
+        }
+        timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+        ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+        while (!gdrom_data_request() && time_before(jiffies, timeout))
+                cpu_relax();
+        if (!time_before(jiffies, timeout + 1)) {
+                gdrom_getsense(NULL);
+                return;
+        }
+        outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
+}
+
+
+/* gdrom_command_executediagnostic:
+ * Used to probe for presence of working GDROM
+ * Restarts GDROM device and then applies standard ATA 3
+ * Execute Diagnostic Command: a return of '1' indicates device 0
+ * present and device 1 absent
+ */
+static char gdrom_execute_diagnostic(void)
+{
+        gdrom_hardreset(gd.cd_info);
+        if (!gdrom_wait_clrbusy())
+                return 0;
+        ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
+        if (!gdrom_wait_busy_sleeps())
+                return 0;
+        return ctrl_inb(GDROM_ERROR_REG);
+}
+
+/*
+ * Prepare disk command
+ * byte 0 = 0x70
+ * byte 1 = 0x1f
+ */
+static int gdrom_preparedisk_cmd(void)
+{
+        struct packet_command *spin_command;
+        spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+        if (!spin_command)
+                return -ENOMEM;
+        spin_command->cmd[0] = 0x70;
+        spin_command->cmd[2] = 0x1f;
+        spin_command->buflen = 0;
+        gd.pending = 1;
+        gdrom_packetcommand(gd.cd_info, spin_command);
+        /* 60 second timeout */
+        wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+                GDROM_DEFAULT_TIMEOUT);
+        gd.pending = 0;
+        kfree(spin_command);
+        if (gd.status & 0x01) {
+                /* log an error */
+                gdrom_getsense(NULL);
+                return -EIO;
+        }
+        return 0;
+}
+
+/*
+ * Read TOC command
+ * byte 0 = 0x14
+ * byte 1 = session
+ * byte 3 = sizeof TOC >> 8  ie upper byte
+ * byte 4 = sizeof TOC & 0xff ie lower byte
+ */
+static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
+{
+        int tocsize;
+        struct packet_command *toc_command;
+        int err = 0;
+
+        toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+        if (!toc_command)
+                return -ENOMEM;
+        tocsize = sizeof(struct gdromtoc);
+        toc_command->cmd[0] = 0x14;
+        toc_command->cmd[1] = session;
+        toc_command->cmd[3] = tocsize >> 8;
+        toc_command->cmd[4] = tocsize & 0xff;
+        toc_command->buflen = tocsize;
+        if (gd.pending) {
+                err = -EBUSY;
+                goto cleanup_readtoc_final;
+        }
+        gd.pending = 1;
+        gdrom_packetcommand(gd.cd_info, toc_command);
+        wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+                GDROM_DEFAULT_TIMEOUT);
+        if (gd.pending) {
+                err = -EINVAL;
+                goto cleanup_readtoc;
+        }
+        insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
+        if (gd.status & 0x01)
+                err = -EINVAL;
+
+cleanup_readtoc:
+        gd.pending = 0;
+cleanup_readtoc_final:
+        kfree(toc_command);
+        return err;
+}
+
+/* TOC helpers */
+static int get_entry_lba(int track)
+{
+        return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
+}
+
+static int get_entry_q_ctrl(int track)
+{
+        return (track & 0x000000f0) >> 4;
+}
+
+static int get_entry_track(int track)
+{
+        return (track & 0x0000ff00) >> 8;
+}
+
+static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
+        struct cdrom_multisession *ms_info)
+{
+        int fentry, lentry, track, data, tocuse, err;
+        if (!gd.toc)
+                return -ENOMEM;
+        tocuse = 1;
+        /* Check if GD-ROM */
+        err = gdrom_readtoc_cmd(gd.toc, 1);
+        /* Not a GD-ROM so check if standard CD-ROM */
+        if (err) {
+                tocuse = 0;
+                err = gdrom_readtoc_cmd(gd.toc, 0);
+                if (err) {
+                        printk(KERN_INFO "GDROM: Could not get CD "
+                                "table of contents\n");
+                        return -ENXIO;
+                }
+        }
+
+        fentry = get_entry_track(gd.toc->first);
+        lentry = get_entry_track(gd.toc->last);
+        /* Find the first data track */
+        track = get_entry_track(gd.toc->last);
+        do {
+                data = gd.toc->entry[track - 1];
+                if (get_entry_q_ctrl(data))
+                        break;  /* ie a real data track */
+                track--;
+        } while (track >= fentry);
+
+        if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
+                printk(KERN_INFO "GDROM: No data on the last "
+                        "session of the CD\n");
+                gdrom_getsense(NULL);
+                return -ENXIO;
+        }
+
+        ms_info->addr_format = CDROM_LBA;
+        ms_info->addr.lba = get_entry_lba(data);
+        ms_info->xa_flag = 1;
+        return 0;
+}
+
+static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
+{
+        /* spin up the disk */
+        return gdrom_preparedisk_cmd();
+}
+
+/* this function is required even if empty */
+static void gdrom_release(struct cdrom_device_info *cd_info)
+{
+}
+
+static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
+{
+        /* read the sense key */
+        char sense = ctrl_inb(GDROM_ERROR_REG);
+        sense &= 0xF0;
+        if (sense == 0)
+                return CDS_DISC_OK;
+        if (sense == 0x20)
+                return CDS_DRIVE_NOT_READY;
+        /* default */
+        return CDS_NO_INFO;
+}
+
+static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+{
+        /* check the sense key */
+        return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+}
+
+/* reset the G1 bus */
+static int gdrom_hardreset(struct cdrom_device_info *cd_info)
+{
+        int count;
+        ctrl_outl(0x1fffff, GDROM_RESET_REG);
+        for (count = 0xa0000000; count < 0xa0200000; count += 4)
+                ctrl_inl(count);
+        return 0;
+}
+
+/* keep the function looking like the universal
+ * CD Rom specification  - returning int */
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+        struct packet_command *command)
+{
+        gdrom_spicommand(&command->cmd, command->buflen);
+        return 0;
+}
+
+/* Get Sense SPI command
+ * From Marcus Comstedt
+ * cmd = 0x13
+ * cmd + 4 = length of returned buffer
+ * Returns 5 16 bit words
+ */
+static int gdrom_getsense(short *bufstring)
+{
+        struct packet_command *sense_command;
+        short sense[5];
+        int sense_key;
+        int err = -EIO;
+
+        sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+        if (!sense_command)
+                return -ENOMEM;
+        sense_command->cmd[0] = 0x13;
+        sense_command->cmd[4] = 10;
+        sense_command->buflen = 10;
+        /* even if something is pending try to get
+        * the sense key if possible */
+        if (gd.pending && !gdrom_wait_clrbusy()) {
+                err = -EBUSY;
+                goto cleanup_sense_final;
+        }
+        gd.pending = 1;
+        gdrom_packetcommand(gd.cd_info, sense_command);
+        wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+                GDROM_DEFAULT_TIMEOUT);
+        if (gd.pending)
+                goto cleanup_sense;
+        insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2);
+        if (sense[1] & 40) {
+                printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+                goto cleanup_sense;
+        }
+        sense_key = sense[1] & 0x0F;
+        if (sense_key < ARRAY_SIZE(sense_texts))
+                printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+        else
+                printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+        if (bufstring) /* return addional sense data */
+                memcpy(bufstring, &sense[4], 2);
+        if (sense_key < 2)
+                err = 0;
+
+cleanup_sense:
+        gd.pending = 0;
+cleanup_sense_final:
+        kfree(sense_command);
+        return err;
+}
+
+static struct cdrom_device_ops gdrom_ops = {
+        .open                   = gdrom_open,
+        .release                = gdrom_release,
+        .drive_status           = gdrom_drivestatus,
+        .media_changed          = gdrom_mediachanged,
+        .get_last_session       = gdrom_get_last_session,
+        .reset                  = gdrom_hardreset,
+        .capability             = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+                                  CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
+        .n_minors               = 1,
+};
+
+static int gdrom_bdops_open(struct inode *inode, struct file *file)
+{
+        return cdrom_open(gd.cd_info, inode, file);
+}
+
+static int gdrom_bdops_release(struct inode *inode, struct file *file)
+{
+        return cdrom_release(gd.cd_info, file);
+}
+
+static int gdrom_bdops_mediachanged(struct gendisk *disk)
+{
+        return cdrom_media_changed(gd.cd_info);
+}
+
+static int gdrom_bdops_ioctl(struct inode *inode, struct file *file,
+        unsigned cmd, unsigned long arg)
+{
+        return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
+}
+
+static struct block_device_operations gdrom_bdops = {
+        .owner                  = THIS_MODULE,
+        .open                   = gdrom_bdops_open,
+        .release                = gdrom_bdops_release,
+        .media_changed          = gdrom_bdops_mediachanged,
+        .ioctl                  = gdrom_bdops_ioctl,
+};
+
+static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
+{
+        gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+        if (gd.pending != 1)
+                return IRQ_HANDLED;
+        gd.pending = 0;
+        wake_up_interruptible(&command_queue);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
+{
+        gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+        if (gd.transfer != 1)
+                return IRQ_HANDLED;
+        gd.transfer = 0;
+        wake_up_interruptible(&request_queue);
+        return IRQ_HANDLED;
+}
+
+static int __devinit gdrom_set_interrupt_handlers(void)
+{
+        int err;
+
+        err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
+                IRQF_DISABLED, "gdrom_command", &gd);
+        if (err)
+                return err;
+        err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
+                IRQF_DISABLED, "gdrom_dma", &gd);
+        if (err)
+                free_irq(HW_EVENT_GDROM_CMD, &gd);
+        return err;
+}
+
+/* Implement DMA read using SPI command
+ * 0 -> 0x30
+ * 1 -> mode
+ * 2 -> block >> 16
+ * 3 -> block >> 8
+ * 4 -> block
+ * 8 -> sectors >> 16
+ * 9 -> sectors >> 8
+ * 10 -> sectors
+ */
+static void gdrom_readdisk_dma(struct work_struct *work)
+{
+        int err, block, block_cnt;
+        struct packet_command *read_command;
+        struct list_head *elem, *next;
+        struct request *req;
+        unsigned long timeout;
+
+        if (list_empty(&gdrom_deferred))
+                return;
+        read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+        if (!read_command)
+                return; /* get more memory later? */
+        read_command->cmd[0] = 0x30;
+        read_command->cmd[1] = 0x20;
+        spin_lock(&gdrom_lock);
+        list_for_each_safe(elem, next, &gdrom_deferred) {
+                req = list_entry(elem, struct request, queuelist);
+                spin_unlock(&gdrom_lock);
+                block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
+                block_cnt = req->nr_sectors/GD_TO_BLK;
+                ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
+                ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
+                ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
+                ctrl_outl(1, GDROM_DMA_ENABLE_REG);
+                read_command->cmd[2] = (block >> 16) & 0xFF;
+                read_command->cmd[3] = (block >> 8) & 0xFF;
+                read_command->cmd[4] = block & 0xFF;
+                read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
+                read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
+                read_command->cmd[10] = block_cnt & 0xFF;
+                /* set for DMA */
+                ctrl_outb(1, GDROM_ERROR_REG);
+                /* other registers */
+                ctrl_outb(0, GDROM_SECNUM_REG);
+                ctrl_outb(0, GDROM_BCL_REG);
+                ctrl_outb(0, GDROM_BCH_REG);
+                ctrl_outb(0, GDROM_DSEL_REG);
+                ctrl_outb(0, GDROM_INTSEC_REG);
+                /* Wait for registers to reset after any previous activity */
+                timeout = jiffies + HZ / 2;
+                while (gdrom_is_busy() && time_before(jiffies, timeout))
+                        cpu_relax();
+                ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+                timeout = jiffies + HZ / 2;
+                /* Wait for packet command to finish */
+                while (gdrom_is_busy() && time_before(jiffies, timeout))
+                        cpu_relax();
+                gd.pending = 1;
+                gd.transfer = 1;
+                outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
+                timeout = jiffies + HZ / 2;
+                /* Wait for any pending DMA to finish */
+                while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
+                        time_before(jiffies, timeout))
+                        cpu_relax();
+                /* start transfer */
+                ctrl_outb(1, GDROM_DMA_STATUS_REG);
+                wait_event_interruptible_timeout(request_queue,
+                        gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
+                err = gd.transfer;
+                gd.transfer = 0;
+                gd.pending = 0;
+                /* now seek to take the request spinlock
+                * before handling ending the request */
+                spin_lock(&gdrom_lock);
+                list_del_init(&req->queuelist);
+                end_dequeued_request(req, 1 - err);
+        }
+        spin_unlock(&gdrom_lock);
+        kfree(read_command);
+}
+
+static void gdrom_request_handler_dma(struct request *req)
+{
+        /* dequeue, add to list of deferred work
+        * and then schedule workqueue */
+        blkdev_dequeue_request(req);
+        list_add_tail(&req->queuelist, &gdrom_deferred);
+        schedule_work(&work);
+}
+
+static void gdrom_request(struct request_queue *rq)
+{
+        struct request *req;
+
+        while ((req = elv_next_request(rq)) != NULL) {
+                if (!blk_fs_request(req)) {
+                        printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+                        end_request(req, 0);
+                }
+                if (rq_data_dir(req) != READ) {
+                        printk(KERN_NOTICE "GDROM: Read only device -");
+                        printk(" write request ignored\n");
+                        end_request(req, 0);
+                }
+                if (req->nr_sectors)
+                        gdrom_request_handler_dma(req);
+                else
+                        end_request(req, 0);
+        }
+}
+
+/* Print string identifying GD ROM device */
+static int __devinit gdrom_outputversion(void)
+{
+        struct gdrom_id *id;
+        char *model_name, *manuf_name, *firmw_ver;
+        int err = -ENOMEM;
+
+        /* query device ID */
+        id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
+        if (!id)
+                return err;
+        gdrom_identifydevice(id);
+        model_name = kstrndup(id->modname, 16, GFP_KERNEL);
+        if (!model_name)
+                goto free_id;
+        manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
+        if (!manuf_name)
+                goto free_model_name;
+        firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
+        if (!firmw_ver)
+                goto free_manuf_name;
+        printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
+                model_name, manuf_name, firmw_ver);
+        err = 0;
+        kfree(firmw_ver);
+free_manuf_name:
+        kfree(manuf_name);
+free_model_name:
+        kfree(model_name);
+free_id:
+        kfree(id);
+        return err;
+}
+
+/* set the default mode for DMA transfer */
+static int __devinit gdrom_init_dma_mode(void)
+{
+        ctrl_outb(0x13, GDROM_ERROR_REG);
+        ctrl_outb(0x22, GDROM_INTSEC_REG);
+        if (!gdrom_wait_clrbusy())
+                return -EBUSY;
+        ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
+        if (!gdrom_wait_busy_sleeps())
+                return -EBUSY;
+        /* Memory protection setting for GDROM DMA
+        * Bits 31 - 16 security: 0x8843
+        * Bits 15 and 7 reserved (0)
+        * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
+        * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
+        * (0x40 | 0x80) = start range at 0x0C000000
+        * (0x7F | 0x80) = end range at 0x0FFFFFFF */
+        ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
+        ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
+        return 0;
+}
+
+static void __devinit probe_gdrom_setupcd(void)
+{
+        gd.cd_info->ops = &gdrom_ops;
+        gd.cd_info->capacity = 1;
+        strcpy(gd.cd_info->name, GDROM_DEV_NAME);
+        gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
+                CDC_SELECT_DISC;
+}
+
+static void __devinit probe_gdrom_setupdisk(void)
+{
+        gd.disk->major = gdrom_major;
+        gd.disk->first_minor = 1;
+        gd.disk->minors = 1;
+        strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
+}
+
+static int __devinit probe_gdrom_setupqueue(void)
+{
+        blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
+        /* using DMA so memory will need to be contiguous */
+        blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+        /* set a large max size to get most from DMA */
+        blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
+        gd.disk->queue = gd.gdrom_rq;
+        return gdrom_init_dma_mode();
+}
+
+/*
+ * register this as a block device and as compliant with the
+ * universal CD Rom driver interface
+ */
+static int __devinit probe_gdrom(struct platform_device *devptr)
+{
+        int err;
+        /* Start the device */
+        if (gdrom_execute_diagnostic() != 1) {
+                printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+                return -ENODEV;
+        }
+        /* Print out firmware ID */
+        if (gdrom_outputversion())
+                return -ENOMEM;
+        /* Register GDROM */
+        gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
+        if (gdrom_major <= 0)
+                return gdrom_major;
+        printk(KERN_INFO "GDROM: Registered with major number %d\n",
+                gdrom_major);
+        /* Specify basic properties of drive */
+        gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
+        if (!gd.cd_info) {
+                err = -ENOMEM;
+                goto probe_fail_no_mem;
+        }
+        probe_gdrom_setupcd();
+        gd.disk = alloc_disk(1);
+        if (!gd.disk) {
+                err = -ENODEV;
+                goto probe_fail_no_disk;
+        }
+        probe_gdrom_setupdisk();
+        if (register_cdrom(gd.cd_info)) {
+                err = -ENODEV;
+                goto probe_fail_cdrom_register;
+        }
+        gd.disk->fops = &gdrom_bdops;
+        /* latch on to the interrupt */
+        err = gdrom_set_interrupt_handlers();
+        if (err)
+                goto probe_fail_cmdirq_register;
+        gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
+        if (!gd.gdrom_rq)
+                goto probe_fail_requestq;
+
+        err = probe_gdrom_setupqueue();
+        if (err)
+                goto probe_fail_toc;
+
+        gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
+        if (!gd.toc)
+                goto probe_fail_toc;
+        add_disk(gd.disk);
+        return 0;
+
+probe_fail_toc:
+        blk_cleanup_queue(gd.gdrom_rq);
+probe_fail_requestq:
+        free_irq(HW_EVENT_GDROM_DMA, &gd);
+        free_irq(HW_EVENT_GDROM_CMD, &gd);
+probe_fail_cmdirq_register:
+probe_fail_cdrom_register:
+        del_gendisk(gd.disk);
+probe_fail_no_disk:
+        kfree(gd.cd_info);
+        unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+        gdrom_major = 0;
+probe_fail_no_mem:
+        printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err);
+        return err;
+}
+
+static int __devexit remove_gdrom(struct platform_device *devptr)
+{
+        flush_scheduled_work();
+        blk_cleanup_queue(gd.gdrom_rq);
+        free_irq(HW_EVENT_GDROM_CMD, &gd);
+        free_irq(HW_EVENT_GDROM_DMA, &gd);
+        del_gendisk(gd.disk);
+        if (gdrom_major)
+                unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+        return unregister_cdrom(gd.cd_info);
+}
+
+static struct platform_driver gdrom_driver = {
+        .probe = probe_gdrom,
+        .remove = __devexit_p(remove_gdrom),
+        .driver = {
+                        .name = GDROM_DEV_NAME,
+        },
+};
+
+static int __init init_gdrom(void)
+{
+        int rc;
+        gd.toc = NULL;
+        rc = platform_driver_register(&gdrom_driver);
+        if (rc)
+                return rc;
+        pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
+        if (IS_ERR(pd)) {
+                platform_driver_unregister(&gdrom_driver);
+                return PTR_ERR(pd);
+        }
+        return 0;
+}
+
+static void __exit exit_gdrom(void)
+{
+        platform_device_unregister(pd);
+        platform_driver_unregister(&gdrom_driver);
+        kfree(gd.toc);
+}
+
+module_init(init_gdrom);
+module_exit(exit_gdrom);
+MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
+MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
+MODULE_LICENSE("GPL");