881 строка
22 KiB
C
881 строка
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* GD ROM driver for the SEGA Dreamcast
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* copyright Adrian McMenamin, 2007
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* With thanks to Marcus Comstedt and Nathan Keynes
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* for work in reversing PIO and DMA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/cdrom.h>
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#include <linux/bio.h>
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#include <linux/blk-mq.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/wait.h>
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#include <linux/platform_device.h>
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#include <scsi/scsi.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/delay.h>
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#include <mach/dma.h>
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#include <mach/sysasic.h>
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#define GDROM_DEV_NAME "gdrom"
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#define GD_SESSION_OFFSET 150
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/* GD Rom commands */
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#define GDROM_COM_SOFTRESET 0x08
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#define GDROM_COM_EXECDIAG 0x90
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#define GDROM_COM_PACKET 0xA0
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#define GDROM_COM_IDDEV 0xA1
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/* GD Rom registers */
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#define GDROM_BASE_REG 0xA05F7000
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#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
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#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
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#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
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#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
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#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
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#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
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#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
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#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
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#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
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#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
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#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
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#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
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#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
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#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
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#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
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#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
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#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
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#define GDROM_HARD_SECTOR 2048
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#define BLOCK_LAYER_SECTOR 512
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#define GD_TO_BLK 4
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#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
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static DEFINE_MUTEX(gdrom_mutex);
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static const struct {
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int sense_key;
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const char * const text;
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} sense_texts[] = {
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{NO_SENSE, "OK"},
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{RECOVERED_ERROR, "Recovered from error"},
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{NOT_READY, "Device not ready"},
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{MEDIUM_ERROR, "Disk not ready"},
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{HARDWARE_ERROR, "Hardware error"},
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{ILLEGAL_REQUEST, "Command has failed"},
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{UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
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{DATA_PROTECT, "Data protection error"},
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{ABORTED_COMMAND, "Command aborted"},
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};
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static struct platform_device *pd;
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static int gdrom_major;
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static DECLARE_WAIT_QUEUE_HEAD(command_queue);
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static DECLARE_WAIT_QUEUE_HEAD(request_queue);
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struct gdromtoc {
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unsigned int entry[99];
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unsigned int first, last;
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unsigned int leadout;
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};
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static struct gdrom_unit {
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struct gendisk *disk;
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struct cdrom_device_info *cd_info;
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int status;
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int pending;
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int transfer;
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char disk_type;
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struct gdromtoc *toc;
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struct request_queue *gdrom_rq;
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struct blk_mq_tag_set tag_set;
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} gd;
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struct gdrom_id {
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char mid;
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char modid;
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char verid;
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char padA[13];
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char mname[16];
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char modname[16];
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char firmver[16];
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char padB[16];
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};
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static int gdrom_getsense(short *bufstring);
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static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
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struct packet_command *command);
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static int gdrom_hardreset(struct cdrom_device_info *cd_info);
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static bool gdrom_is_busy(void)
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{
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return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
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}
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static bool gdrom_data_request(void)
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{
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return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
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}
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static bool gdrom_wait_clrbusy(void)
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{
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unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
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while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) &&
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(time_before(jiffies, timeout)))
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cpu_relax();
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return time_before(jiffies, timeout + 1);
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}
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static bool gdrom_wait_busy_sleeps(void)
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{
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unsigned long timeout;
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/* Wait to get busy first */
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timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
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while (!gdrom_is_busy() && time_before(jiffies, timeout))
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cpu_relax();
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/* Now wait for busy to clear */
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return gdrom_wait_clrbusy();
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}
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static void gdrom_identifydevice(void *buf)
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{
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int c;
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short *data = buf;
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/* If the device won't clear it has probably
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* been hit by a serious failure - but we'll
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* try to return a sense key even so */
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if (!gdrom_wait_clrbusy()) {
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gdrom_getsense(NULL);
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return;
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}
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__raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
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if (!gdrom_wait_busy_sleeps()) {
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gdrom_getsense(NULL);
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return;
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}
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/* now read in the data */
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for (c = 0; c < 40; c++)
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data[c] = __raw_readw(GDROM_DATA_REG);
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}
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static void gdrom_spicommand(void *spi_string, int buflen)
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{
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short *cmd = spi_string;
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unsigned long timeout;
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/* ensure IRQ_WAIT is set */
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__raw_writeb(0x08, GDROM_ALTSTATUS_REG);
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/* specify how many bytes we expect back */
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__raw_writeb(buflen & 0xFF, GDROM_BCL_REG);
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__raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
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/* other parameters */
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__raw_writeb(0, GDROM_INTSEC_REG);
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__raw_writeb(0, GDROM_SECNUM_REG);
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__raw_writeb(0, GDROM_ERROR_REG);
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/* Wait until we can go */
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if (!gdrom_wait_clrbusy()) {
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gdrom_getsense(NULL);
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return;
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}
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timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
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__raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
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while (!gdrom_data_request() && time_before(jiffies, timeout))
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cpu_relax();
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if (!time_before(jiffies, timeout + 1)) {
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gdrom_getsense(NULL);
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return;
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}
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outsw(GDROM_DATA_REG, cmd, 6);
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}
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/* gdrom_command_executediagnostic:
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* Used to probe for presence of working GDROM
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* Restarts GDROM device and then applies standard ATA 3
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* Execute Diagnostic Command: a return of '1' indicates device 0
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* present and device 1 absent
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*/
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static char gdrom_execute_diagnostic(void)
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{
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gdrom_hardreset(gd.cd_info);
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if (!gdrom_wait_clrbusy())
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return 0;
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__raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
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if (!gdrom_wait_busy_sleeps())
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return 0;
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return __raw_readb(GDROM_ERROR_REG);
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}
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/*
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* Prepare disk command
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* byte 0 = 0x70
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* byte 1 = 0x1f
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*/
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static int gdrom_preparedisk_cmd(void)
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{
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struct packet_command *spin_command;
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spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
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if (!spin_command)
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return -ENOMEM;
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spin_command->cmd[0] = 0x70;
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spin_command->cmd[2] = 0x1f;
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spin_command->buflen = 0;
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gd.pending = 1;
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gdrom_packetcommand(gd.cd_info, spin_command);
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/* 60 second timeout */
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wait_event_interruptible_timeout(command_queue, gd.pending == 0,
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GDROM_DEFAULT_TIMEOUT);
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gd.pending = 0;
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kfree(spin_command);
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if (gd.status & 0x01) {
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/* log an error */
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gdrom_getsense(NULL);
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return -EIO;
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}
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return 0;
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}
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/*
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* Read TOC command
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* byte 0 = 0x14
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* byte 1 = session
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* byte 3 = sizeof TOC >> 8 ie upper byte
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* byte 4 = sizeof TOC & 0xff ie lower byte
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*/
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static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
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{
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int tocsize;
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struct packet_command *toc_command;
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int err = 0;
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toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
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if (!toc_command)
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return -ENOMEM;
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tocsize = sizeof(struct gdromtoc);
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toc_command->cmd[0] = 0x14;
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toc_command->cmd[1] = session;
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toc_command->cmd[3] = tocsize >> 8;
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toc_command->cmd[4] = tocsize & 0xff;
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toc_command->buflen = tocsize;
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if (gd.pending) {
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err = -EBUSY;
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goto cleanup_readtoc_final;
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}
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gd.pending = 1;
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gdrom_packetcommand(gd.cd_info, toc_command);
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wait_event_interruptible_timeout(command_queue, gd.pending == 0,
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GDROM_DEFAULT_TIMEOUT);
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if (gd.pending) {
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err = -EINVAL;
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goto cleanup_readtoc;
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}
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insw(GDROM_DATA_REG, toc, tocsize/2);
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if (gd.status & 0x01)
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err = -EINVAL;
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cleanup_readtoc:
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gd.pending = 0;
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cleanup_readtoc_final:
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kfree(toc_command);
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return err;
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}
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/* TOC helpers */
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static int get_entry_lba(int track)
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{
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return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
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}
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static int get_entry_q_ctrl(int track)
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{
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return (track & 0x000000f0) >> 4;
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}
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static int get_entry_track(int track)
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{
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return (track & 0x0000ff00) >> 8;
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}
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static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
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struct cdrom_multisession *ms_info)
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{
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int fentry, lentry, track, data, err;
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if (!gd.toc)
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return -ENOMEM;
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/* Check if GD-ROM */
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err = gdrom_readtoc_cmd(gd.toc, 1);
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/* Not a GD-ROM so check if standard CD-ROM */
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if (err) {
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err = gdrom_readtoc_cmd(gd.toc, 0);
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if (err) {
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pr_info("Could not get CD table of contents\n");
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return -ENXIO;
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}
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}
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fentry = get_entry_track(gd.toc->first);
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lentry = get_entry_track(gd.toc->last);
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/* Find the first data track */
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track = get_entry_track(gd.toc->last);
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do {
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data = gd.toc->entry[track - 1];
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if (get_entry_q_ctrl(data))
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break; /* ie a real data track */
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track--;
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} while (track >= fentry);
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if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
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pr_info("No data on the last session of the CD\n");
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gdrom_getsense(NULL);
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return -ENXIO;
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}
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ms_info->addr_format = CDROM_LBA;
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ms_info->addr.lba = get_entry_lba(data);
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ms_info->xa_flag = 1;
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return 0;
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}
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static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
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{
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/* spin up the disk */
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return gdrom_preparedisk_cmd();
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}
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/* this function is required even if empty */
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static void gdrom_release(struct cdrom_device_info *cd_info)
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{
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}
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static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
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{
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/* read the sense key */
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char sense = __raw_readb(GDROM_ERROR_REG);
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sense &= 0xF0;
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if (sense == 0)
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return CDS_DISC_OK;
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if (sense == 0x20)
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return CDS_DRIVE_NOT_READY;
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/* default */
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return CDS_NO_INFO;
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}
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static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,
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unsigned int clearing, int ignore)
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{
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/* check the sense key */
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return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?
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DISK_EVENT_MEDIA_CHANGE : 0;
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}
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/* reset the G1 bus */
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static int gdrom_hardreset(struct cdrom_device_info *cd_info)
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{
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int count;
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__raw_writel(0x1fffff, GDROM_RESET_REG);
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for (count = 0xa0000000; count < 0xa0200000; count += 4)
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__raw_readl(count);
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return 0;
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}
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/* keep the function looking like the universal
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* CD Rom specification - returning int */
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static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
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struct packet_command *command)
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{
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gdrom_spicommand(&command->cmd, command->buflen);
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return 0;
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}
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/* Get Sense SPI command
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* From Marcus Comstedt
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* cmd = 0x13
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* cmd + 4 = length of returned buffer
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* Returns 5 16 bit words
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*/
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static int gdrom_getsense(short *bufstring)
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{
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struct packet_command *sense_command;
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short sense[5];
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int sense_key;
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int err = -EIO;
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sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
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if (!sense_command)
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return -ENOMEM;
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sense_command->cmd[0] = 0x13;
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sense_command->cmd[4] = 10;
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sense_command->buflen = 10;
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/* even if something is pending try to get
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* the sense key if possible */
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if (gd.pending && !gdrom_wait_clrbusy()) {
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err = -EBUSY;
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goto cleanup_sense_final;
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}
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gd.pending = 1;
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gdrom_packetcommand(gd.cd_info, sense_command);
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wait_event_interruptible_timeout(command_queue, gd.pending == 0,
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GDROM_DEFAULT_TIMEOUT);
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if (gd.pending)
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goto cleanup_sense;
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insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
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if (sense[1] & 40) {
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pr_info("Drive not ready - command aborted\n");
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goto cleanup_sense;
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}
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sense_key = sense[1] & 0x0F;
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if (sense_key < ARRAY_SIZE(sense_texts))
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pr_info("%s\n", sense_texts[sense_key].text);
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else
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pr_err("Unknown sense key: %d\n", sense_key);
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if (bufstring) /* return addional sense data */
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memcpy(bufstring, &sense[4], 2);
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if (sense_key < 2)
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err = 0;
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cleanup_sense:
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gd.pending = 0;
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cleanup_sense_final:
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kfree(sense_command);
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return err;
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}
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static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
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void *arg)
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{
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return -EINVAL;
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}
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static const struct cdrom_device_ops gdrom_ops = {
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.open = gdrom_open,
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.release = gdrom_release,
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.drive_status = gdrom_drivestatus,
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.check_events = gdrom_check_events,
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.get_last_session = gdrom_get_last_session,
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.reset = gdrom_hardreset,
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.audio_ioctl = gdrom_audio_ioctl,
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.generic_packet = cdrom_dummy_generic_packet,
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.capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
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CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
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};
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static int gdrom_bdops_open(struct gendisk *disk, blk_mode_t mode)
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{
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int ret;
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disk_check_media_change(disk);
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mutex_lock(&gdrom_mutex);
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ret = cdrom_open(gd.cd_info, mode);
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mutex_unlock(&gdrom_mutex);
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return ret;
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}
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static void gdrom_bdops_release(struct gendisk *disk)
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{
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mutex_lock(&gdrom_mutex);
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cdrom_release(gd.cd_info);
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mutex_unlock(&gdrom_mutex);
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}
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|
|
static unsigned int gdrom_bdops_check_events(struct gendisk *disk,
|
|
unsigned int clearing)
|
|
{
|
|
return cdrom_check_events(gd.cd_info, clearing);
|
|
}
|
|
|
|
static int gdrom_bdops_ioctl(struct block_device *bdev, blk_mode_t mode,
|
|
unsigned cmd, unsigned long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&gdrom_mutex);
|
|
ret = cdrom_ioctl(gd.cd_info, bdev, cmd, arg);
|
|
mutex_unlock(&gdrom_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct block_device_operations gdrom_bdops = {
|
|
.owner = THIS_MODULE,
|
|
.open = gdrom_bdops_open,
|
|
.release = gdrom_bdops_release,
|
|
.check_events = gdrom_bdops_check_events,
|
|
.ioctl = gdrom_bdops_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = blkdev_compat_ptr_ioctl,
|
|
#endif
|
|
};
|
|
|
|
static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
|
|
{
|
|
gd.status = __raw_readb(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 = __raw_readb(GDROM_STATUSCOMMAND_REG);
|
|
if (gd.transfer != 1)
|
|
return IRQ_HANDLED;
|
|
gd.transfer = 0;
|
|
wake_up_interruptible(&request_queue);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int gdrom_set_interrupt_handlers(void)
|
|
{
|
|
int err;
|
|
|
|
err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
|
|
0, "gdrom_command", &gd);
|
|
if (err)
|
|
return err;
|
|
err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
|
|
0, "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 blk_status_t gdrom_readdisk_dma(struct request *req)
|
|
{
|
|
int block, block_cnt;
|
|
blk_status_t err;
|
|
struct packet_command *read_command;
|
|
unsigned long timeout;
|
|
|
|
read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
|
|
if (!read_command)
|
|
return BLK_STS_RESOURCE;
|
|
|
|
read_command->cmd[0] = 0x30;
|
|
read_command->cmd[1] = 0x20;
|
|
block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
|
|
block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
|
|
__raw_writel(page_to_phys(bio_page(req->bio)) + bio_offset(req->bio),
|
|
GDROM_DMA_STARTADDR_REG);
|
|
__raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
|
|
__raw_writel(1, GDROM_DMA_DIRECTION_REG);
|
|
__raw_writel(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 */
|
|
__raw_writeb(1, GDROM_ERROR_REG);
|
|
/* other registers */
|
|
__raw_writeb(0, GDROM_SECNUM_REG);
|
|
__raw_writeb(0, GDROM_BCL_REG);
|
|
__raw_writeb(0, GDROM_BCH_REG);
|
|
__raw_writeb(0, GDROM_DSEL_REG);
|
|
__raw_writeb(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();
|
|
__raw_writeb(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(GDROM_DATA_REG, &read_command->cmd, 6);
|
|
timeout = jiffies + HZ / 2;
|
|
/* Wait for any pending DMA to finish */
|
|
while (__raw_readb(GDROM_DMA_STATUS_REG) &&
|
|
time_before(jiffies, timeout))
|
|
cpu_relax();
|
|
/* start transfer */
|
|
__raw_writeb(1, GDROM_DMA_STATUS_REG);
|
|
wait_event_interruptible_timeout(request_queue,
|
|
gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
|
|
err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;
|
|
gd.transfer = 0;
|
|
gd.pending = 0;
|
|
|
|
blk_mq_end_request(req, err);
|
|
kfree(read_command);
|
|
return BLK_STS_OK;
|
|
}
|
|
|
|
static blk_status_t gdrom_queue_rq(struct blk_mq_hw_ctx *hctx,
|
|
const struct blk_mq_queue_data *bd)
|
|
{
|
|
blk_mq_start_request(bd->rq);
|
|
|
|
switch (req_op(bd->rq)) {
|
|
case REQ_OP_READ:
|
|
return gdrom_readdisk_dma(bd->rq);
|
|
case REQ_OP_WRITE:
|
|
pr_notice("Read only device - write request ignored\n");
|
|
return BLK_STS_IOERR;
|
|
default:
|
|
printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
|
|
return BLK_STS_IOERR;
|
|
}
|
|
}
|
|
|
|
/* Print string identifying GD ROM device */
|
|
static int 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;
|
|
pr_info("%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 gdrom_init_dma_mode(void)
|
|
{
|
|
__raw_writeb(0x13, GDROM_ERROR_REG);
|
|
__raw_writeb(0x22, GDROM_INTSEC_REG);
|
|
if (!gdrom_wait_clrbusy())
|
|
return -EBUSY;
|
|
__raw_writeb(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 */
|
|
__raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
|
|
__raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
|
|
return 0;
|
|
}
|
|
|
|
static void 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 probe_gdrom_setupdisk(void)
|
|
{
|
|
gd.disk->major = gdrom_major;
|
|
gd.disk->first_minor = 1;
|
|
gd.disk->minors = 1;
|
|
gd.disk->flags |= GENHD_FL_NO_PART;
|
|
strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
|
|
}
|
|
|
|
static int probe_gdrom_setupqueue(void)
|
|
{
|
|
blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
|
|
/* using DMA so memory will need to be contiguous */
|
|
blk_queue_max_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();
|
|
}
|
|
|
|
static const struct blk_mq_ops gdrom_mq_ops = {
|
|
.queue_rq = gdrom_queue_rq,
|
|
};
|
|
|
|
/*
|
|
* register this as a block device and as compliant with the
|
|
* universal CD Rom driver interface
|
|
*/
|
|
static int probe_gdrom(struct platform_device *devptr)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* Ensure our "one" device is initialized properly in case of previous
|
|
* usages of it
|
|
*/
|
|
memset(&gd, 0, sizeof(gd));
|
|
|
|
/* Start the device */
|
|
if (gdrom_execute_diagnostic() != 1) {
|
|
pr_warn("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;
|
|
pr_info("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();
|
|
|
|
err = blk_mq_alloc_sq_tag_set(&gd.tag_set, &gdrom_mq_ops, 1,
|
|
BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);
|
|
if (err)
|
|
goto probe_fail_free_cd_info;
|
|
|
|
gd.disk = blk_mq_alloc_disk(&gd.tag_set, NULL);
|
|
if (IS_ERR(gd.disk)) {
|
|
err = PTR_ERR(gd.disk);
|
|
goto probe_fail_free_tag_set;
|
|
}
|
|
gd.gdrom_rq = gd.disk->queue;
|
|
probe_gdrom_setupdisk();
|
|
if (register_cdrom(gd.disk, gd.cd_info)) {
|
|
err = -ENODEV;
|
|
goto probe_fail_cleanup_disk;
|
|
}
|
|
gd.disk->fops = &gdrom_bdops;
|
|
gd.disk->events = DISK_EVENT_MEDIA_CHANGE;
|
|
/* latch on to the interrupt */
|
|
err = gdrom_set_interrupt_handlers();
|
|
if (err)
|
|
goto probe_fail_cleanup_disk;
|
|
|
|
err = probe_gdrom_setupqueue();
|
|
if (err)
|
|
goto probe_fail_free_irqs;
|
|
|
|
gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
|
|
if (!gd.toc) {
|
|
err = -ENOMEM;
|
|
goto probe_fail_free_irqs;
|
|
}
|
|
err = add_disk(gd.disk);
|
|
if (err)
|
|
goto probe_fail_add_disk;
|
|
|
|
return 0;
|
|
|
|
probe_fail_add_disk:
|
|
kfree(gd.toc);
|
|
probe_fail_free_irqs:
|
|
free_irq(HW_EVENT_GDROM_DMA, &gd);
|
|
free_irq(HW_EVENT_GDROM_CMD, &gd);
|
|
probe_fail_cleanup_disk:
|
|
put_disk(gd.disk);
|
|
probe_fail_free_tag_set:
|
|
blk_mq_free_tag_set(&gd.tag_set);
|
|
probe_fail_free_cd_info:
|
|
kfree(gd.cd_info);
|
|
probe_fail_no_mem:
|
|
unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
|
|
gdrom_major = 0;
|
|
pr_warn("Probe failed - error is 0x%X\n", err);
|
|
return err;
|
|
}
|
|
|
|
static int remove_gdrom(struct platform_device *devptr)
|
|
{
|
|
blk_mq_free_tag_set(&gd.tag_set);
|
|
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);
|
|
unregister_cdrom(gd.cd_info);
|
|
kfree(gd.cd_info);
|
|
kfree(gd.toc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
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);
|
|
}
|
|
|
|
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");
|