lkml.org 
[lkml]   [2007]   [Dec]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    SubjectRe: [PATCH] SH/Dreamcast - add support for GD-Rom device
    From
    Date

    On Thu, 2007-12-27 at 16:52 +0000, Adrian McMenamin wrote:
    > This patch adds support for the CD-Rom drive on the SEGA Dreamcast.
    >
    > The SEGA Dreamcast has a built in CD-Rom drive, electrically similar
    > to an ATA-3 drive, but implementing a proprietary packet interface -
    > the so-called Sega Packet Interface (SPI)- and also supporting a
    > proprietary format of disk - the Giga Disk Rom, with a 1GB capacity.
    > The drive is know as the "GD-Rom drive".
    >
    > This patch partially implements the SPI and also supports reading GD
    > Rom disks. Unlike previous GD Rom drivers (which were never in the
    > mainline), this driver implements DMA and not PIO for reads. It is a
    > new driver, not a modified version of previous drivers.
    >
    > This is the fifth iteration of this patch - which should work with
    > both 2.6-24-rc5 and Paul Mundt's 2.6.25 queue.
    >
    > Signed-off by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
    >
    > ----
    >
    Following up on more comments, here is a slightly reworked version of
    the patch with better request handling.

    Signed-off by: Adrian McMenamin <adrian@mcmen.demon.co.uk>

    ----

    diff -rupN linux-2.6-orig/drivers/block/Kconfig linux-2.6/drivers/block/Kconfig
    --- linux-2.6-orig/drivers/block/Kconfig 2007-12-26 17:27:14.000000000 +0000
    +++ linux-2.6/drivers/block/Kconfig 2007-12-27 16:39:05.000000000 +0000
    @@ -105,6 +105,17 @@ config PARIDE
    "MicroSolutions backpack protocol", "DataStor Commuter protocol"
    etc.).

    +config GDROM
    + tristate "SEGA Dreamcast GD-ROM drive"
    + depends on SH_DREAMCAST
    + help
    + A standard SEGA Dreamcast comes with a modified CD ROM drive called a
    + "GD-ROM" by SEGA to signify it is capable of reading special disks
    + with up to 1 GB of data. This drive will also read standard CD ROM
    + disks. Select this option to access any disks in your GD ROM drive.
    + Most users will want to say "Y" here.
    + You can also build this as a module which will be called gdrom.ko
    +
    source "drivers/block/paride/Kconfig"

    config BLK_CPQ_DA
    diff -rupN linux-2.6-orig/drivers/cdrom/gdrom.c linux-2.6/drivers/cdrom/gdrom.c
    --- linux-2.6-orig/drivers/cdrom/gdrom.c 1970-01-01 01:00:00.000000000 +0100
    +++ linux-2.6/drivers/cdrom/gdrom.c 2007-12-27 20:45:18.000000000 +0000
    @@ -0,0 +1,772 @@
    +/* 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
    +
    +static const struct {
    + int sense_key;
    + const char * const text;
    +} sense_texts[] = {
    + {NO_SENSE, "GDROM: OK"},
    + {RECOVERED_ERROR, "GDROM: Recovered from error"},
    + {NOT_READY, "GDROM: Device not ready"},
    + {MEDIUM_ERROR, "GDROM: Disk not ready"},
    + {HARDWARE_ERROR, "GDROM: Hardware error"},
    + {ILLEGAL_REQUEST, "GDROM: Command has failed"},
    + {UNIT_ATTENTION, "GDROM: Device needs attention - disk may have been changed"},
    + {DATA_PROTECT, "GDROM: Data protection error"},
    + {ABORTED_COMMAND, "GDROM: Command aborted"},
    +};
    +
    +static struct platform_device *pd;
    +static int gdrom_major;
    +static wait_queue_head_t command_queue;
    +static wait_queue_head_t 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 void gdrom_wait_clrbusy(void)
    +{
    + /* long timeouts - typical for a CD Rom */
    + unsigned long timeout = jiffies + HZ * 60;
    + while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) && (time_before(jiffies, timeout)))
    + cpu_relax();
    +}
    +
    +static void gdrom_wait_busy_sleeps(void)
    +{
    + unsigned long timeout;
    + /* Wait to get busy first */
    + timeout = jiffies + HZ * 60;
    + while (((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) == 0) && (time_before(jiffies, timeout)))
    + cpu_relax();
    + /* Now wait for busy to clear */
    + gdrom_wait_clrbusy();
    +}
    +
    +static void gdrom_identifydevice(void *buf)
    +{
    + int c;
    + short *data = buf;
    + gdrom_wait_clrbusy();
    + ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
    + gdrom_wait_busy_sleeps();
    + /* 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;
    + /* 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 */
    + gdrom_wait_clrbusy();
    + ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
    + while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) != 8)
    + cpu_relax(); /* wait for DRQ to be set to 1 */
    + 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);
    + gdrom_wait_clrbusy();
    + ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
    + gdrom_wait_busy_sleeps();
    + 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, HZ * 60);
    + 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;
    + 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;
    + gd.pending = 1;
    + gdrom_packetcommand(gd.cd_info, toc_command);
    + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
    + gd.pending = 0;
    + insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
    + kfree(toc_command);
    + if (gd.status & 0x01)
    + return -EINVAL;
    + return 0;
    +}
    +
    +/* 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))) {
    + gdrom_getsense(NULL);
    + printk(KERN_INFO "GDROM: No data on the last session of the CD\n");
    + 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;
    + if (gd.pending)
    + return -EIO;
    +
    + /* allocate command and buffer */
    + 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;
    +
    + gd.pending = 1;
    + gdrom_packetcommand(gd.cd_info, sense_command);
    + /* 60 second timeout */
    + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
    + gd.pending = 0;
    + kfree(sense_command);
    + insw(PHYSADDR(GDROM_DATA_REG), &sense, 5);
    + if (sense[1] & 40) {
    + printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
    + return -EIO;
    + }
    + sense_key = sense[1] & 0x0F;
    + printk(KERN_INFO "%s\n", sense_texts[sense_key].text);
    +
    + if (bufstring)
    + memcpy(bufstring, &sense[4], 2); /* return additional sense data */
    +
    + if (sense_key < 2)
    + return 0;
    + return -EIO;
    +}
    +
    +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;
    + init_waitqueue_head(&command_queue);
    + err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, IRQF_DISABLED, "gdrom_command", &gd);
    + if (err)
    + return err;
    + init_waitqueue_head(&request_queue);
    + 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);
    + /* In multiple DMA transfers need to wait */
    + timeout = jiffies + HZ / 2;
    + while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) && (time_before(jiffies, timeout)))
    + cpu_relax();
    + ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
    + timeout = jiffies + HZ / 2;
    + while (((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) != 8) && (time_before(jiffies, timeout)))
    + cpu_relax(); /* wait for DRQ to be set to 1 */
    + gd.pending = 1;
    + gd.transfer = 1;
    + outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
    + timeout = jiffies + HZ / 2;
    + while ((ctrl_inb(GDROM_DMA_STATUS_REG)) && (time_before(jiffies, timeout)))
    + cpu_relax();
    + ctrl_outb(1, GDROM_DMA_STATUS_REG);
    + /* 5 second error margin here seems more reasonable */
    + wait_event_interruptible_timeout(request_queue, gd.transfer == 0, HZ * 5);
    + err = ctrl_inb(GDROM_DMA_STATUS_REG);
    + 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 - 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 void __devinit gdrom_init_dma_mode(void)
    +{
    + ctrl_outb(0x13, GDROM_ERROR_REG);
    + ctrl_outb(0x22, GDROM_INTSEC_REG);
    + gdrom_wait_clrbusy();
    + ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
    + gdrom_wait_busy_sleeps();
    + ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); /* memory setting */
    + ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
    +}
    +
    +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 void __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;
    + 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;
    + if (gdrom_execute_diagnostic() != 1) {
    + printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
    + return -ENODEV;
    + }
    + if (gdrom_outputversion())
    + return -ENOMEM;
    + gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
    + if (gdrom_major <= 0)
    + return gdrom_major;
    + printk(KERN_INFO "GDROM: Block device is registered with major number %d\n", gdrom_major);
    + 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;
    + probe_gdrom_setupqueue();
    + 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: Could not probe for device - error is 0x%X\n", err);
    + return err;
    +}
    +
    +static int remove_gdrom(struct platform_device *devptr)
    +{
    + 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 = 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");
    diff -rupN linux-2.6-orig/drivers/cdrom/Makefile linux-2.6/drivers/cdrom/Makefile
    --- linux-2.6-orig/drivers/cdrom/Makefile 2007-12-26 17:27:15.000000000 +0000
    +++ linux-2.6/drivers/cdrom/Makefile 2007-12-27 00:08:39.000000000 +0000
    @@ -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



    \
     
     \ /
      Last update: 2007-12-27 21:59    [W:0.064 / U:122.484 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site