2 This is a block driver for the direct (mmaped) interface to the CF-slot,
3 found in Routerboard.com's RB532 board
4 See SDK provided from routerboard.com.
6 Module adapted By P.Christeas <p_christeas@yahoo.com>, 2005-6.
7 Cleaned up and adapted to platform_device by Felix Fietkau <nbd@openwrt.org>
9 This work is redistributed under the terms of the GNU General Public License.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/time.h>
16 #include <linux/wait.h>
18 #include <linux/genhd.h>
19 #include <linux/blkdev.h>
20 #include <linux/blkpg.h>
21 #include <linux/hdreg.h>
22 #include <linux/platform_device.h>
24 #include <asm/uaccess.h>
28 #include <asm/rc32434/rb.h>
34 #define DEBUGP(format, args...)
38 #define CF_MIPS_MAJOR 13
39 #define MAJOR_NR CF_MIPS_MAJOR
40 #define CF_MAX_PART 16 /* max 15 partitions */
44 //extern struct block_device_operations cf_bdops;
46 // static struct hd_struct cf_parts[CF_MAX_PART];
47 // static int cf_part_sizes[CF_MAX_PART];
48 // static int cf_hsect_sizes[CF_MAX_PART];
49 // static int cf_max_sectors[CF_MAX_PART];
50 // static int cf_blksize_sizes[CF_MAX_PART];
52 // static spinlock_t lock = SPIN_LOCK_UNLOCKED;
54 // volatile int cf_busy = 0;
56 static struct request *active_req = NULL;
58 static int cf_open (struct inode *, struct file *);
59 static int cf_release (struct inode *, struct file *);
60 static int cf_ioctl (struct inode *, struct file *, unsigned, unsigned long);
62 static void cf_request(request_queue_t * q);
63 static int cf_transfer(const struct request *req);
65 /*long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
66 long (*compat_ioctl) (struct file *, unsigned, unsigned long);*/
67 // int (*direct_access) (struct block_device *, sector_t, unsigned long *);
68 // int (*media_changed) (struct gendisk *);
69 // int (*revalidate_disk) (struct gendisk *);
71 static struct block_device_operations cf_bdops = {
74 .release = cf_release,
76 .media_changed = NULL,
77 .unlocked_ioctl = NULL,
78 .revalidate_disk = NULL,
84 int cf_mips_probe(struct platform_device *pdev)
86 struct gendisk* cf_gendisk=NULL;
87 struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
88 struct cf_mips_dev *dev;
92 reg_result = register_blkdev(MAJOR_NR, "cf-mips");
94 printk(KERN_WARNING "cf-mips: can't get major %d\n", MAJOR_NR);
98 dev = (struct cf_mips_dev *)kmalloc(sizeof(struct cf_mips_dev),GFP_KERNEL);
101 memset(dev, 0, sizeof(struct cf_mips_dev));
104 dev->pin = cdev->gpio_pin;
105 dev->irq = platform_get_irq_byname(pdev, "cf_irq");
106 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cf_membase");
107 dev->base = (void *) r->start;
109 if (cf_init(dev)) goto out_err;
112 spin_lock_init(&dev->lock);
113 dev->queue = blk_init_queue(cf_request,&dev->lock);
115 printk(KERN_ERR "cf-mips: no mem for queue\n");
118 blk_queue_max_sectors(dev->queue,ATA_MAX_SECT_PER_CMD);
120 /* For memory devices, it is always better to avoid crossing segments
121 inside the same request. */
122 /* if (dev->dtype==0x848A){
123 printk(KERN_INFO "Setting boundary for cf to 0x%x",(dev->block_size*512)-1);
124 blk_queue_segment_boundary(dev->queue, (dev->block_size*512)-1);
127 dev->gd = alloc_disk(CF_MAX_PART);
128 cf_gendisk = dev->gd;
130 if (!cf_gendisk) goto out_err; /* Last of these goto's */
132 cf_gendisk->major = MAJOR_NR;
133 cf_gendisk->first_minor = 0;
134 cf_gendisk->queue=dev->queue;
135 BUG_ON(cf_gendisk->minors != CF_MAX_PART);
136 strcpy(cf_gendisk->disk_name,"cfa");
137 cf_gendisk->fops = &cf_bdops;
138 cf_gendisk->flags = 0 ; /* is not yet GENHD_FL_REMOVABLE */
139 cf_gendisk->private_data=dev;
141 set_capacity(cf_gendisk,dev->sectors * CF_KERNEL_MUL);
143 /* Let the disk go live */
144 add_disk(cf_gendisk);
148 /* default cfg for all partitions */
149 memset(cf_parts, 0, sizeof (cf_parts[0]) * CF_MAX_PART);
150 memset(cf_part_sizes, 0, sizeof (cf_part_sizes[0]) * CF_MAX_PART);
151 for (i = 0; i < CF_MAX_PART; ++i) {
152 cf_hsect_sizes[i] = CF_SECT_SIZE;
153 cf_max_sectors[i] = ATA_MAX_SECT_PER_CMD;
154 cf_blksize_sizes[i] = BLOCK_SIZE;
157 /* setup info for whole disk (partition 0) */
158 cf_part_sizes[0] = cf_sectors / 2;
159 cf_parts[0].nr_sects = cf_sectors;
161 blk_size[MAJOR_NR] = cf_part_sizes;
162 blksize_size[MAJOR_NR] = cf_blksize_sizes;
163 max_sectors[MAJOR_NR] = cf_max_sectors;
164 hardsect_size[MAJOR_NR] = cf_hsect_sizes;
165 read_ahead[MAJOR_NR] = 8; /* (4kB) */
167 blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
169 add_gendisk(&cf_gendisk);
171 // printk(KERN_INFO "cf-mips partition check: \n");
172 // register_disk(cf_gendisk, MKDEV(MAJOR_NR, 0), CF_MAX_PART,
173 // &cf_bdops, dev->sectors);
178 blk_cleanup_queue(dev->queue);
181 unregister_blkdev(MAJOR_NR, "cf-mips");
192 cf_mips_remove(struct platform_device *pdev)
194 struct cf_device *cdev = (struct cf_device *) pdev->dev.platform_data;
195 struct cf_mips_dev *dev = (struct cf_mips_dev *) cdev->dev;
197 unregister_blkdev(MAJOR_NR, "cf-mips");
198 blk_cleanup_queue(dev->queue);
200 del_gendisk(dev->gd);
206 static struct platform_driver cf_driver = {
207 .driver.name = "rb500-cf",
208 .probe = cf_mips_probe,
209 .remove = cf_mips_remove,
212 static int __init cf_mips_init(void)
214 printk(KERN_INFO "cf-mips module loaded\n");
215 return platform_driver_register(&cf_driver);
218 static void cf_mips_cleanup(void)
220 platform_driver_unregister(&cf_driver);
221 printk(KERN_INFO "cf-mips module removed\n");
224 module_init(cf_mips_init);
225 module_exit(cf_mips_cleanup);
227 MODULE_LICENSE("GPL");
228 MODULE_ALIAS_BLOCKDEV_MAJOR(CF_MIPS_MAJOR);
231 static int cf_open(struct inode *inode, struct file *filp)
233 struct cf_mips_dev *dev=inode->i_bdev->bd_disk->private_data;
234 int minor = MINOR(inode->i_rdev);
236 if (minor >= CF_MAX_PART)
238 //DEBUGP(KERN_INFO "cf-mips module opened, minor %d\n", minor);
239 spin_lock(&dev->lock);
241 spin_unlock(&dev->lock);
242 filp->private_data=dev;
244 /* dirty workaround to set CFRDY GPIO as an input when some other
245 program sets it as an output */
246 gpio_set_value(dev->pin, 0);
247 return 0; /* success */
250 static int cf_release(struct inode *inode, struct file *filp)
252 int minor = MINOR(inode->i_rdev);
253 struct cf_mips_dev *dev=inode->i_bdev->bd_disk->private_data;
254 spin_lock(&dev->lock);
256 spin_unlock(&dev->lock);
260 static int cf_ioctl(struct inode *inode, struct file *filp,
261 unsigned int cmd, unsigned long arg)
263 unsigned minor = MINOR(inode->i_rdev);
264 struct cf_mips_dev *dev=inode->i_bdev->bd_disk->private_data;
266 DEBUGP(KERN_INFO "cf_ioctl cmd %u\n", cmd);
268 case BLKRRPART: /* re-read partition table */
269 if (!capable(CAP_SYS_ADMIN))
271 printk(KERN_INFO "cf-mips partition check: \n");
272 register_disk(dev->gd);
277 struct hd_geometry geo;
278 geo.cylinders = dev->cyl;
279 geo.heads = dev->head;
280 geo.sectors = dev->spt;
281 geo.start = (*dev->gd->part)[minor].start_sect;
282 if (copy_to_user((void *) arg, &geo, sizeof (geo)))
288 return -EINVAL; /* unknown command */
291 static void cf_request(request_queue_t * q)
293 struct cf_mips_dev* dev;
295 struct request * req;
298 /* We could have q->queuedata = dev , but haven't yet. */
302 while ((req=elv_next_request(q))!=NULL){
303 dev=req->rq_disk->private_data;
304 status=cf_transfer(req);
305 if (status==CF_TRANS_IN_PROGRESS){
309 end_request(req,status);
313 static int cf_transfer(const struct request *req)
315 struct cf_mips_dev* dev=req->rq_disk->private_data;
317 if (!blk_fs_request(req)){
318 if (printk_ratelimit())
319 printk(KERN_WARNING "cf-mips: skipping non-fs request 0x%x\n",req->cmd[0]);
320 return CF_TRANS_FAILED;
323 return cf_do_transfer(dev,req->sector,req->current_nr_sectors,req->buffer,rq_data_dir(req));
326 void cf_async_trans_done(struct cf_mips_dev * dev,int result)
330 spin_lock(&dev->lock);
333 end_request(req,result);
334 spin_unlock(&dev->lock);
336 spin_lock(&dev->lock);
337 cf_request(dev->queue);
338 spin_unlock(&dev->lock);