Root/drivers/cdrom/gdrom.c

1/* GD ROM driver for the SEGA Dreamcast
2 * copyright Adrian McMenamin, 2007
3 * With thanks to Marcus Comstedt and Nathan Keynes
4 * for work in reversing PIO and DMA
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 */
21
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/fs.h>
27#include <linux/kernel.h>
28#include <linux/list.h>
29#include <linux/slab.h>
30#include <linux/dma-mapping.h>
31#include <linux/cdrom.h>
32#include <linux/genhd.h>
33#include <linux/bio.h>
34#include <linux/blkdev.h>
35#include <linux/interrupt.h>
36#include <linux/device.h>
37#include <linux/mutex.h>
38#include <linux/wait.h>
39#include <linux/workqueue.h>
40#include <linux/platform_device.h>
41#include <scsi/scsi.h>
42#include <asm/io.h>
43#include <asm/dma.h>
44#include <asm/delay.h>
45#include <mach/dma.h>
46#include <mach/sysasic.h>
47
48#define GDROM_DEV_NAME "gdrom"
49#define GD_SESSION_OFFSET 150
50
51/* GD Rom commands */
52#define GDROM_COM_SOFTRESET 0x08
53#define GDROM_COM_EXECDIAG 0x90
54#define GDROM_COM_PACKET 0xA0
55#define GDROM_COM_IDDEV 0xA1
56
57/* GD Rom registers */
58#define GDROM_BASE_REG 0xA05F7000
59#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
60#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
61#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
62#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
63#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
64#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
65#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
66#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
67#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
68#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
69
70#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
71#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
72#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
73#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
74#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
75#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
76#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
77
78#define GDROM_HARD_SECTOR 2048
79#define BLOCK_LAYER_SECTOR 512
80#define GD_TO_BLK 4
81
82#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
83
84static DEFINE_MUTEX(gdrom_mutex);
85static const struct {
86    int sense_key;
87    const char * const text;
88} sense_texts[] = {
89    {NO_SENSE, "OK"},
90    {RECOVERED_ERROR, "Recovered from error"},
91    {NOT_READY, "Device not ready"},
92    {MEDIUM_ERROR, "Disk not ready"},
93    {HARDWARE_ERROR, "Hardware error"},
94    {ILLEGAL_REQUEST, "Command has failed"},
95    {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
96    {DATA_PROTECT, "Data protection error"},
97    {ABORTED_COMMAND, "Command aborted"},
98};
99
100static struct platform_device *pd;
101static int gdrom_major;
102static DECLARE_WAIT_QUEUE_HEAD(command_queue);
103static DECLARE_WAIT_QUEUE_HEAD(request_queue);
104
105static DEFINE_SPINLOCK(gdrom_lock);
106static void gdrom_readdisk_dma(struct work_struct *work);
107static DECLARE_WORK(work, gdrom_readdisk_dma);
108static LIST_HEAD(gdrom_deferred);
109
110struct gdromtoc {
111    unsigned int entry[99];
112    unsigned int first, last;
113    unsigned int leadout;
114};
115
116static struct gdrom_unit {
117    struct gendisk *disk;
118    struct cdrom_device_info *cd_info;
119    int status;
120    int pending;
121    int transfer;
122    char disk_type;
123    struct gdromtoc *toc;
124    struct request_queue *gdrom_rq;
125} gd;
126
127struct gdrom_id {
128    char mid;
129    char modid;
130    char verid;
131    char padA[13];
132    char mname[16];
133    char modname[16];
134    char firmver[16];
135    char padB[16];
136};
137
138static int gdrom_getsense(short *bufstring);
139static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
140    struct packet_command *command);
141static int gdrom_hardreset(struct cdrom_device_info *cd_info);
142
143static bool gdrom_is_busy(void)
144{
145    return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
146}
147
148static bool gdrom_data_request(void)
149{
150    return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
151}
152
153static bool gdrom_wait_clrbusy(void)
154{
155    unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
156    while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) &&
157        (time_before(jiffies, timeout)))
158        cpu_relax();
159    return time_before(jiffies, timeout + 1);
160}
161
162static bool gdrom_wait_busy_sleeps(void)
163{
164    unsigned long timeout;
165    /* Wait to get busy first */
166    timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
167    while (!gdrom_is_busy() && time_before(jiffies, timeout))
168        cpu_relax();
169    /* Now wait for busy to clear */
170    return gdrom_wait_clrbusy();
171}
172
173static void gdrom_identifydevice(void *buf)
174{
175    int c;
176    short *data = buf;
177    /* If the device won't clear it has probably
178    * been hit by a serious failure - but we'll
179    * try to return a sense key even so */
180    if (!gdrom_wait_clrbusy()) {
181        gdrom_getsense(NULL);
182        return;
183    }
184    __raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
185    if (!gdrom_wait_busy_sleeps()) {
186        gdrom_getsense(NULL);
187        return;
188    }
189    /* now read in the data */
190    for (c = 0; c < 40; c++)
191        data[c] = __raw_readw(GDROM_DATA_REG);
192}
193
194static void gdrom_spicommand(void *spi_string, int buflen)
195{
196    short *cmd = spi_string;
197    unsigned long timeout;
198
199    /* ensure IRQ_WAIT is set */
200    __raw_writeb(0x08, GDROM_ALTSTATUS_REG);
201    /* specify how many bytes we expect back */
202    __raw_writeb(buflen & 0xFF, GDROM_BCL_REG);
203    __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
204    /* other parameters */
205    __raw_writeb(0, GDROM_INTSEC_REG);
206    __raw_writeb(0, GDROM_SECNUM_REG);
207    __raw_writeb(0, GDROM_ERROR_REG);
208    /* Wait until we can go */
209    if (!gdrom_wait_clrbusy()) {
210        gdrom_getsense(NULL);
211        return;
212    }
213    timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
214    __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
215    while (!gdrom_data_request() && time_before(jiffies, timeout))
216        cpu_relax();
217    if (!time_before(jiffies, timeout + 1)) {
218        gdrom_getsense(NULL);
219        return;
220    }
221    outsw(GDROM_DATA_REG, cmd, 6);
222}
223
224
225/* gdrom_command_executediagnostic:
226 * Used to probe for presence of working GDROM
227 * Restarts GDROM device and then applies standard ATA 3
228 * Execute Diagnostic Command: a return of '1' indicates device 0
229 * present and device 1 absent
230 */
231static char gdrom_execute_diagnostic(void)
232{
233    gdrom_hardreset(gd.cd_info);
234    if (!gdrom_wait_clrbusy())
235        return 0;
236    __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
237    if (!gdrom_wait_busy_sleeps())
238        return 0;
239    return __raw_readb(GDROM_ERROR_REG);
240}
241
242/*
243 * Prepare disk command
244 * byte 0 = 0x70
245 * byte 1 = 0x1f
246 */
247static int gdrom_preparedisk_cmd(void)
248{
249    struct packet_command *spin_command;
250    spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
251    if (!spin_command)
252        return -ENOMEM;
253    spin_command->cmd[0] = 0x70;
254    spin_command->cmd[2] = 0x1f;
255    spin_command->buflen = 0;
256    gd.pending = 1;
257    gdrom_packetcommand(gd.cd_info, spin_command);
258    /* 60 second timeout */
259    wait_event_interruptible_timeout(command_queue, gd.pending == 0,
260        GDROM_DEFAULT_TIMEOUT);
261    gd.pending = 0;
262    kfree(spin_command);
263    if (gd.status & 0x01) {
264        /* log an error */
265        gdrom_getsense(NULL);
266        return -EIO;
267    }
268    return 0;
269}
270
271/*
272 * Read TOC command
273 * byte 0 = 0x14
274 * byte 1 = session
275 * byte 3 = sizeof TOC >> 8 ie upper byte
276 * byte 4 = sizeof TOC & 0xff ie lower byte
277 */
278static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
279{
280    int tocsize;
281    struct packet_command *toc_command;
282    int err = 0;
283
284    toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
285    if (!toc_command)
286        return -ENOMEM;
287    tocsize = sizeof(struct gdromtoc);
288    toc_command->cmd[0] = 0x14;
289    toc_command->cmd[1] = session;
290    toc_command->cmd[3] = tocsize >> 8;
291    toc_command->cmd[4] = tocsize & 0xff;
292    toc_command->buflen = tocsize;
293    if (gd.pending) {
294        err = -EBUSY;
295        goto cleanup_readtoc_final;
296    }
297    gd.pending = 1;
298    gdrom_packetcommand(gd.cd_info, toc_command);
299    wait_event_interruptible_timeout(command_queue, gd.pending == 0,
300        GDROM_DEFAULT_TIMEOUT);
301    if (gd.pending) {
302        err = -EINVAL;
303        goto cleanup_readtoc;
304    }
305    insw(GDROM_DATA_REG, toc, tocsize/2);
306    if (gd.status & 0x01)
307        err = -EINVAL;
308
309cleanup_readtoc:
310    gd.pending = 0;
311cleanup_readtoc_final:
312    kfree(toc_command);
313    return err;
314}
315
316/* TOC helpers */
317static int get_entry_lba(int track)
318{
319    return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
320}
321
322static int get_entry_q_ctrl(int track)
323{
324    return (track & 0x000000f0) >> 4;
325}
326
327static int get_entry_track(int track)
328{
329    return (track & 0x0000ff00) >> 8;
330}
331
332static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
333    struct cdrom_multisession *ms_info)
334{
335    int fentry, lentry, track, data, tocuse, err;
336    if (!gd.toc)
337        return -ENOMEM;
338    tocuse = 1;
339    /* Check if GD-ROM */
340    err = gdrom_readtoc_cmd(gd.toc, 1);
341    /* Not a GD-ROM so check if standard CD-ROM */
342    if (err) {
343        tocuse = 0;
344        err = gdrom_readtoc_cmd(gd.toc, 0);
345        if (err) {
346            pr_info("Could not get CD table of contents\n");
347            return -ENXIO;
348        }
349    }
350
351    fentry = get_entry_track(gd.toc->first);
352    lentry = get_entry_track(gd.toc->last);
353    /* Find the first data track */
354    track = get_entry_track(gd.toc->last);
355    do {
356        data = gd.toc->entry[track - 1];
357        if (get_entry_q_ctrl(data))
358            break; /* ie a real data track */
359        track--;
360    } while (track >= fentry);
361
362    if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
363        pr_info("No data on the last session of the CD\n");
364        gdrom_getsense(NULL);
365        return -ENXIO;
366    }
367
368    ms_info->addr_format = CDROM_LBA;
369    ms_info->addr.lba = get_entry_lba(data);
370    ms_info->xa_flag = 1;
371    return 0;
372}
373
374static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
375{
376    /* spin up the disk */
377    return gdrom_preparedisk_cmd();
378}
379
380/* this function is required even if empty */
381static void gdrom_release(struct cdrom_device_info *cd_info)
382{
383}
384
385static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
386{
387    /* read the sense key */
388    char sense = __raw_readb(GDROM_ERROR_REG);
389    sense &= 0xF0;
390    if (sense == 0)
391        return CDS_DISC_OK;
392    if (sense == 0x20)
393        return CDS_DRIVE_NOT_READY;
394    /* default */
395    return CDS_NO_INFO;
396}
397
398static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,
399                       unsigned int clearing, int ignore)
400{
401    /* check the sense key */
402    return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?
403        DISK_EVENT_MEDIA_CHANGE : 0;
404}
405
406/* reset the G1 bus */
407static int gdrom_hardreset(struct cdrom_device_info *cd_info)
408{
409    int count;
410    __raw_writel(0x1fffff, GDROM_RESET_REG);
411    for (count = 0xa0000000; count < 0xa0200000; count += 4)
412        __raw_readl(count);
413    return 0;
414}
415
416/* keep the function looking like the universal
417 * CD Rom specification - returning int */
418static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
419    struct packet_command *command)
420{
421    gdrom_spicommand(&command->cmd, command->buflen);
422    return 0;
423}
424
425/* Get Sense SPI command
426 * From Marcus Comstedt
427 * cmd = 0x13
428 * cmd + 4 = length of returned buffer
429 * Returns 5 16 bit words
430 */
431static int gdrom_getsense(short *bufstring)
432{
433    struct packet_command *sense_command;
434    short sense[5];
435    int sense_key;
436    int err = -EIO;
437
438    sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
439    if (!sense_command)
440        return -ENOMEM;
441    sense_command->cmd[0] = 0x13;
442    sense_command->cmd[4] = 10;
443    sense_command->buflen = 10;
444    /* even if something is pending try to get
445    * the sense key if possible */
446    if (gd.pending && !gdrom_wait_clrbusy()) {
447        err = -EBUSY;
448        goto cleanup_sense_final;
449    }
450    gd.pending = 1;
451    gdrom_packetcommand(gd.cd_info, sense_command);
452    wait_event_interruptible_timeout(command_queue, gd.pending == 0,
453        GDROM_DEFAULT_TIMEOUT);
454    if (gd.pending)
455        goto cleanup_sense;
456    insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
457    if (sense[1] & 40) {
458        pr_info("Drive not ready - command aborted\n");
459        goto cleanup_sense;
460    }
461    sense_key = sense[1] & 0x0F;
462    if (sense_key < ARRAY_SIZE(sense_texts))
463        pr_info("%s\n", sense_texts[sense_key].text);
464    else
465        pr_err("Unknown sense key: %d\n", sense_key);
466    if (bufstring) /* return addional sense data */
467        memcpy(bufstring, &sense[4], 2);
468    if (sense_key < 2)
469        err = 0;
470
471cleanup_sense:
472    gd.pending = 0;
473cleanup_sense_final:
474    kfree(sense_command);
475    return err;
476}
477
478static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
479                 void *arg)
480{
481    return -EINVAL;
482}
483
484static struct cdrom_device_ops gdrom_ops = {
485    .open = gdrom_open,
486    .release = gdrom_release,
487    .drive_status = gdrom_drivestatus,
488    .check_events = gdrom_check_events,
489    .get_last_session = gdrom_get_last_session,
490    .reset = gdrom_hardreset,
491    .audio_ioctl = gdrom_audio_ioctl,
492    .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
493                  CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
494    .n_minors = 1,
495};
496
497static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
498{
499    int ret;
500    mutex_lock(&gdrom_mutex);
501    ret = cdrom_open(gd.cd_info, bdev, mode);
502    mutex_unlock(&gdrom_mutex);
503    return ret;
504}
505
506static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
507{
508    mutex_lock(&gdrom_mutex);
509    cdrom_release(gd.cd_info, mode);
510    mutex_unlock(&gdrom_mutex);
511    return 0;
512}
513
514static unsigned int gdrom_bdops_check_events(struct gendisk *disk,
515                         unsigned int clearing)
516{
517    return cdrom_check_events(gd.cd_info, clearing);
518}
519
520static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
521    unsigned cmd, unsigned long arg)
522{
523    int ret;
524
525    mutex_lock(&gdrom_mutex);
526    ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
527    mutex_unlock(&gdrom_mutex);
528
529    return ret;
530}
531
532static const struct block_device_operations gdrom_bdops = {
533    .owner = THIS_MODULE,
534    .open = gdrom_bdops_open,
535    .release = gdrom_bdops_release,
536    .check_events = gdrom_bdops_check_events,
537    .ioctl = gdrom_bdops_ioctl,
538};
539
540static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
541{
542    gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
543    if (gd.pending != 1)
544        return IRQ_HANDLED;
545    gd.pending = 0;
546    wake_up_interruptible(&command_queue);
547    return IRQ_HANDLED;
548}
549
550static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
551{
552    gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
553    if (gd.transfer != 1)
554        return IRQ_HANDLED;
555    gd.transfer = 0;
556    wake_up_interruptible(&request_queue);
557    return IRQ_HANDLED;
558}
559
560static int __devinit gdrom_set_interrupt_handlers(void)
561{
562    int err;
563
564    err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
565        IRQF_DISABLED, "gdrom_command", &gd);
566    if (err)
567        return err;
568    err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
569        IRQF_DISABLED, "gdrom_dma", &gd);
570    if (err)
571        free_irq(HW_EVENT_GDROM_CMD, &gd);
572    return err;
573}
574
575/* Implement DMA read using SPI command
576 * 0 -> 0x30
577 * 1 -> mode
578 * 2 -> block >> 16
579 * 3 -> block >> 8
580 * 4 -> block
581 * 8 -> sectors >> 16
582 * 9 -> sectors >> 8
583 * 10 -> sectors
584 */
585static void gdrom_readdisk_dma(struct work_struct *work)
586{
587    int err, block, block_cnt;
588    struct packet_command *read_command;
589    struct list_head *elem, *next;
590    struct request *req;
591    unsigned long timeout;
592
593    if (list_empty(&gdrom_deferred))
594        return;
595    read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
596    if (!read_command)
597        return; /* get more memory later? */
598    read_command->cmd[0] = 0x30;
599    read_command->cmd[1] = 0x20;
600    spin_lock(&gdrom_lock);
601    list_for_each_safe(elem, next, &gdrom_deferred) {
602        req = list_entry(elem, struct request, queuelist);
603        spin_unlock(&gdrom_lock);
604        block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
605        block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
606        __raw_writel(virt_to_phys(req->buffer), GDROM_DMA_STARTADDR_REG);
607        __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
608        __raw_writel(1, GDROM_DMA_DIRECTION_REG);
609        __raw_writel(1, GDROM_DMA_ENABLE_REG);
610        read_command->cmd[2] = (block >> 16) & 0xFF;
611        read_command->cmd[3] = (block >> 8) & 0xFF;
612        read_command->cmd[4] = block & 0xFF;
613        read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
614        read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
615        read_command->cmd[10] = block_cnt & 0xFF;
616        /* set for DMA */
617        __raw_writeb(1, GDROM_ERROR_REG);
618        /* other registers */
619        __raw_writeb(0, GDROM_SECNUM_REG);
620        __raw_writeb(0, GDROM_BCL_REG);
621        __raw_writeb(0, GDROM_BCH_REG);
622        __raw_writeb(0, GDROM_DSEL_REG);
623        __raw_writeb(0, GDROM_INTSEC_REG);
624        /* Wait for registers to reset after any previous activity */
625        timeout = jiffies + HZ / 2;
626        while (gdrom_is_busy() && time_before(jiffies, timeout))
627            cpu_relax();
628        __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
629        timeout = jiffies + HZ / 2;
630        /* Wait for packet command to finish */
631        while (gdrom_is_busy() && time_before(jiffies, timeout))
632            cpu_relax();
633        gd.pending = 1;
634        gd.transfer = 1;
635        outsw(GDROM_DATA_REG, &read_command->cmd, 6);
636        timeout = jiffies + HZ / 2;
637        /* Wait for any pending DMA to finish */
638        while (__raw_readb(GDROM_DMA_STATUS_REG) &&
639            time_before(jiffies, timeout))
640            cpu_relax();
641        /* start transfer */
642        __raw_writeb(1, GDROM_DMA_STATUS_REG);
643        wait_event_interruptible_timeout(request_queue,
644            gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
645        err = gd.transfer ? -EIO : 0;
646        gd.transfer = 0;
647        gd.pending = 0;
648        /* now seek to take the request spinlock
649        * before handling ending the request */
650        spin_lock(&gdrom_lock);
651        list_del_init(&req->queuelist);
652        __blk_end_request_all(req, err);
653    }
654    spin_unlock(&gdrom_lock);
655    kfree(read_command);
656}
657
658static void gdrom_request(struct request_queue *rq)
659{
660    struct request *req;
661
662    while ((req = blk_fetch_request(rq)) != NULL) {
663        if (req->cmd_type != REQ_TYPE_FS) {
664            printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
665            __blk_end_request_all(req, -EIO);
666            continue;
667        }
668        if (rq_data_dir(req) != READ) {
669            pr_notice("Read only device - write request ignored\n");
670            __blk_end_request_all(req, -EIO);
671            continue;
672        }
673
674        /*
675         * Add to list of deferred work and then schedule
676         * workqueue.
677         */
678        list_add_tail(&req->queuelist, &gdrom_deferred);
679        schedule_work(&work);
680    }
681}
682
683/* Print string identifying GD ROM device */
684static int __devinit gdrom_outputversion(void)
685{
686    struct gdrom_id *id;
687    char *model_name, *manuf_name, *firmw_ver;
688    int err = -ENOMEM;
689
690    /* query device ID */
691    id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
692    if (!id)
693        return err;
694    gdrom_identifydevice(id);
695    model_name = kstrndup(id->modname, 16, GFP_KERNEL);
696    if (!model_name)
697        goto free_id;
698    manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
699    if (!manuf_name)
700        goto free_model_name;
701    firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
702    if (!firmw_ver)
703        goto free_manuf_name;
704    pr_info("%s from %s with firmware %s\n",
705        model_name, manuf_name, firmw_ver);
706    err = 0;
707    kfree(firmw_ver);
708free_manuf_name:
709    kfree(manuf_name);
710free_model_name:
711    kfree(model_name);
712free_id:
713    kfree(id);
714    return err;
715}
716
717/* set the default mode for DMA transfer */
718static int __devinit gdrom_init_dma_mode(void)
719{
720    __raw_writeb(0x13, GDROM_ERROR_REG);
721    __raw_writeb(0x22, GDROM_INTSEC_REG);
722    if (!gdrom_wait_clrbusy())
723        return -EBUSY;
724    __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG);
725    if (!gdrom_wait_busy_sleeps())
726        return -EBUSY;
727    /* Memory protection setting for GDROM DMA
728    * Bits 31 - 16 security: 0x8843
729    * Bits 15 and 7 reserved (0)
730    * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
731    * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
732    * (0x40 | 0x80) = start range at 0x0C000000
733    * (0x7F | 0x80) = end range at 0x0FFFFFFF */
734    __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
735    __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
736    return 0;
737}
738
739static void __devinit probe_gdrom_setupcd(void)
740{
741    gd.cd_info->ops = &gdrom_ops;
742    gd.cd_info->capacity = 1;
743    strcpy(gd.cd_info->name, GDROM_DEV_NAME);
744    gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
745        CDC_SELECT_DISC;
746}
747
748static void __devinit probe_gdrom_setupdisk(void)
749{
750    gd.disk->major = gdrom_major;
751    gd.disk->first_minor = 1;
752    gd.disk->minors = 1;
753    strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
754}
755
756static int __devinit probe_gdrom_setupqueue(void)
757{
758    blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
759    /* using DMA so memory will need to be contiguous */
760    blk_queue_max_segments(gd.gdrom_rq, 1);
761    /* set a large max size to get most from DMA */
762    blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
763    gd.disk->queue = gd.gdrom_rq;
764    return gdrom_init_dma_mode();
765}
766
767/*
768 * register this as a block device and as compliant with the
769 * universal CD Rom driver interface
770 */
771static int __devinit probe_gdrom(struct platform_device *devptr)
772{
773    int err;
774    /* Start the device */
775    if (gdrom_execute_diagnostic() != 1) {
776        pr_warning("ATA Probe for GDROM failed\n");
777        return -ENODEV;
778    }
779    /* Print out firmware ID */
780    if (gdrom_outputversion())
781        return -ENOMEM;
782    /* Register GDROM */
783    gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
784    if (gdrom_major <= 0)
785        return gdrom_major;
786    pr_info("Registered with major number %d\n",
787        gdrom_major);
788    /* Specify basic properties of drive */
789    gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
790    if (!gd.cd_info) {
791        err = -ENOMEM;
792        goto probe_fail_no_mem;
793    }
794    probe_gdrom_setupcd();
795    gd.disk = alloc_disk(1);
796    if (!gd.disk) {
797        err = -ENODEV;
798        goto probe_fail_no_disk;
799    }
800    probe_gdrom_setupdisk();
801    if (register_cdrom(gd.cd_info)) {
802        err = -ENODEV;
803        goto probe_fail_cdrom_register;
804    }
805    gd.disk->fops = &gdrom_bdops;
806    /* latch on to the interrupt */
807    err = gdrom_set_interrupt_handlers();
808    if (err)
809        goto probe_fail_cmdirq_register;
810    gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
811    if (!gd.gdrom_rq)
812        goto probe_fail_requestq;
813
814    err = probe_gdrom_setupqueue();
815    if (err)
816        goto probe_fail_toc;
817
818    gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
819    if (!gd.toc)
820        goto probe_fail_toc;
821    add_disk(gd.disk);
822    return 0;
823
824probe_fail_toc:
825    blk_cleanup_queue(gd.gdrom_rq);
826probe_fail_requestq:
827    free_irq(HW_EVENT_GDROM_DMA, &gd);
828    free_irq(HW_EVENT_GDROM_CMD, &gd);
829probe_fail_cmdirq_register:
830probe_fail_cdrom_register:
831    del_gendisk(gd.disk);
832probe_fail_no_disk:
833    kfree(gd.cd_info);
834    unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
835    gdrom_major = 0;
836probe_fail_no_mem:
837    pr_warning("Probe failed - error is 0x%X\n", err);
838    return err;
839}
840
841static int __devexit remove_gdrom(struct platform_device *devptr)
842{
843    flush_work_sync(&work);
844    blk_cleanup_queue(gd.gdrom_rq);
845    free_irq(HW_EVENT_GDROM_CMD, &gd);
846    free_irq(HW_EVENT_GDROM_DMA, &gd);
847    del_gendisk(gd.disk);
848    if (gdrom_major)
849        unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
850    unregister_cdrom(gd.cd_info);
851
852    return 0;
853}
854
855static struct platform_driver gdrom_driver = {
856    .probe = probe_gdrom,
857    .remove = __devexit_p(remove_gdrom),
858    .driver = {
859            .name = GDROM_DEV_NAME,
860    },
861};
862
863static int __init init_gdrom(void)
864{
865    int rc;
866    gd.toc = NULL;
867    rc = platform_driver_register(&gdrom_driver);
868    if (rc)
869        return rc;
870    pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
871    if (IS_ERR(pd)) {
872        platform_driver_unregister(&gdrom_driver);
873        return PTR_ERR(pd);
874    }
875    return 0;
876}
877
878static void __exit exit_gdrom(void)
879{
880    platform_device_unregister(pd);
881    platform_driver_unregister(&gdrom_driver);
882    kfree(gd.toc);
883}
884
885module_init(init_gdrom);
886module_exit(exit_gdrom);
887MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
888MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
889MODULE_LICENSE("GPL");
890

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