1 /*
2 ** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space
3 ** as a block device, to be used as a RAM disk or swap space
4 **
5 ** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
6 **
7 ** ++Geert: support for zorro_unused_z2ram, better range checking
8 ** ++roman: translate accesses via an array
9 ** ++Milan: support for ChipRAM usage
10 ** ++yambo: converted to 2.0 kernel
11 ** ++yambo: modularized and support added for 3 minor devices including:
12 ** MAJOR MINOR DESCRIPTION
13 ** ----- ----- ----------------------------------------------
14 ** 37 0 Use Zorro II and Chip ram
15 ** 37 1 Use only Zorro II ram
16 ** 37 2 Use only Chip ram
17 ** 37 4-7 Use memory list entry 1-4 (first is 0)
18 ** ++jskov: support for 1-4th memory list entry.
19 **
20 ** Permission to use, copy, modify, and distribute this software and its
21 ** documentation for any purpose and without fee is hereby granted, provided
22 ** that the above copyright notice appear in all copies and that both that
23 ** copyright notice and this permission notice appear in supporting
24 ** documentation. This software is provided "as is" without express or
25 ** implied warranty.
26 */
27
28 #define DEVICE_NAME "Z2RAM"
29
30 #include <linux/major.h>
31 #include <linux/vmalloc.h>
32 #include <linux/init.h>
33 #include <linux/module.h>
34 #include <linux/blk-mq.h>
35 #include <linux/bitops.h>
36 #include <linux/mutex.h>
37 #include <linux/slab.h>
38 #include <linux/pgtable.h>
39
40 #include <asm/setup.h>
41 #include <asm/amigahw.h>
42
43 #include <linux/zorro.h>
44
45 #define Z2MINOR_COMBINED (0)
46 #define Z2MINOR_Z2ONLY (1)
47 #define Z2MINOR_CHIPONLY (2)
48 #define Z2MINOR_MEMLIST1 (4)
49 #define Z2MINOR_MEMLIST2 (5)
50 #define Z2MINOR_MEMLIST3 (6)
51 #define Z2MINOR_MEMLIST4 (7)
52 #define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */
53
54 #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
55
56 static DEFINE_MUTEX(z2ram_mutex);
57 static u_long *z2ram_map = NULL;
58 static u_long z2ram_size = 0;
59 static int z2_count = 0;
60 static int chip_count = 0;
61 static int list_count = 0;
62 static int current_device = -1;
63
64 static DEFINE_SPINLOCK(z2ram_lock);
65
66 static struct gendisk *z2ram_gendisk[Z2MINOR_COUNT];
67
z2_queue_rq(struct blk_mq_hw_ctx * hctx,const struct blk_mq_queue_data * bd)68 static blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx,
69 const struct blk_mq_queue_data *bd)
70 {
71 struct request *req = bd->rq;
72 unsigned long start = blk_rq_pos(req) << 9;
73 unsigned long len = blk_rq_cur_bytes(req);
74
75 blk_mq_start_request(req);
76
77 if (start + len > z2ram_size) {
78 pr_err(DEVICE_NAME ": bad access: block=%llu, "
79 "count=%u\n",
80 (unsigned long long)blk_rq_pos(req),
81 blk_rq_cur_sectors(req));
82 return BLK_STS_IOERR;
83 }
84
85 spin_lock_irq(&z2ram_lock);
86
87 while (len) {
88 unsigned long addr = start & Z2RAM_CHUNKMASK;
89 unsigned long size = Z2RAM_CHUNKSIZE - addr;
90 void *buffer = bio_data(req->bio);
91
92 if (len < size)
93 size = len;
94 addr += z2ram_map[start >> Z2RAM_CHUNKSHIFT];
95 if (rq_data_dir(req) == READ)
96 memcpy(buffer, (char *)addr, size);
97 else
98 memcpy((char *)addr, buffer, size);
99 start += size;
100 len -= size;
101 }
102
103 spin_unlock_irq(&z2ram_lock);
104 blk_mq_end_request(req, BLK_STS_OK);
105 return BLK_STS_OK;
106 }
107
get_z2ram(void)108 static void get_z2ram(void)
109 {
110 int i;
111
112 for (i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++) {
113 if (test_bit(i, zorro_unused_z2ram)) {
114 z2_count++;
115 z2ram_map[z2ram_size++] =
116 (unsigned long)ZTWO_VADDR(Z2RAM_START) +
117 (i << Z2RAM_CHUNKSHIFT);
118 clear_bit(i, zorro_unused_z2ram);
119 }
120 }
121
122 return;
123 }
124
get_chipram(void)125 static void get_chipram(void)
126 {
127
128 while (amiga_chip_avail() > (Z2RAM_CHUNKSIZE * 4)) {
129 chip_count++;
130 z2ram_map[z2ram_size] =
131 (u_long) amiga_chip_alloc(Z2RAM_CHUNKSIZE, "z2ram");
132
133 if (z2ram_map[z2ram_size] == 0) {
134 break;
135 }
136
137 z2ram_size++;
138 }
139
140 return;
141 }
142
z2_open(struct block_device * bdev,fmode_t mode)143 static int z2_open(struct block_device *bdev, fmode_t mode)
144 {
145 int device;
146 int max_z2_map = (Z2RAM_SIZE / Z2RAM_CHUNKSIZE) * sizeof(z2ram_map[0]);
147 int max_chip_map = (amiga_chip_size / Z2RAM_CHUNKSIZE) *
148 sizeof(z2ram_map[0]);
149 int rc = -ENOMEM;
150
151 device = MINOR(bdev->bd_dev);
152
153 mutex_lock(&z2ram_mutex);
154 if (current_device != -1 && current_device != device) {
155 rc = -EBUSY;
156 goto err_out;
157 }
158
159 if (current_device == -1) {
160 z2_count = 0;
161 chip_count = 0;
162 list_count = 0;
163 z2ram_size = 0;
164
165 /* Use a specific list entry. */
166 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
167 int index = device - Z2MINOR_MEMLIST1 + 1;
168 unsigned long size, paddr, vaddr;
169
170 if (index >= m68k_realnum_memory) {
171 printk(KERN_ERR DEVICE_NAME
172 ": no such entry in z2ram_map\n");
173 goto err_out;
174 }
175
176 paddr = m68k_memory[index].addr;
177 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE - 1);
178
179 #ifdef __powerpc__
180 /* FIXME: ioremap doesn't build correct memory tables. */
181 {
182 vfree(vmalloc(size));
183 }
184
185 vaddr = (unsigned long)ioremap_wt(paddr, size);
186
187 #else
188 vaddr =
189 (unsigned long)z_remap_nocache_nonser(paddr, size);
190 #endif
191 z2ram_map =
192 kmalloc_array(size / Z2RAM_CHUNKSIZE,
193 sizeof(z2ram_map[0]), GFP_KERNEL);
194 if (z2ram_map == NULL) {
195 printk(KERN_ERR DEVICE_NAME
196 ": cannot get mem for z2ram_map\n");
197 goto err_out;
198 }
199
200 while (size) {
201 z2ram_map[z2ram_size++] = vaddr;
202 size -= Z2RAM_CHUNKSIZE;
203 vaddr += Z2RAM_CHUNKSIZE;
204 list_count++;
205 }
206
207 if (z2ram_size != 0)
208 printk(KERN_INFO DEVICE_NAME
209 ": using %iK List Entry %d Memory\n",
210 list_count * Z2RAM_CHUNK1024, index);
211 } else
212 switch (device) {
213 case Z2MINOR_COMBINED:
214
215 z2ram_map =
216 kmalloc(max_z2_map + max_chip_map,
217 GFP_KERNEL);
218 if (z2ram_map == NULL) {
219 printk(KERN_ERR DEVICE_NAME
220 ": cannot get mem for z2ram_map\n");
221 goto err_out;
222 }
223
224 get_z2ram();
225 get_chipram();
226
227 if (z2ram_size != 0)
228 printk(KERN_INFO DEVICE_NAME
229 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
230 z2_count * Z2RAM_CHUNK1024,
231 chip_count * Z2RAM_CHUNK1024,
232 (z2_count +
233 chip_count) * Z2RAM_CHUNK1024);
234
235 break;
236
237 case Z2MINOR_Z2ONLY:
238 z2ram_map = kmalloc(max_z2_map, GFP_KERNEL);
239 if (!z2ram_map)
240 goto err_out;
241
242 get_z2ram();
243
244 if (z2ram_size != 0)
245 printk(KERN_INFO DEVICE_NAME
246 ": using %iK of Zorro II RAM\n",
247 z2_count * Z2RAM_CHUNK1024);
248
249 break;
250
251 case Z2MINOR_CHIPONLY:
252 z2ram_map = kmalloc(max_chip_map, GFP_KERNEL);
253 if (!z2ram_map)
254 goto err_out;
255
256 get_chipram();
257
258 if (z2ram_size != 0)
259 printk(KERN_INFO DEVICE_NAME
260 ": using %iK Chip RAM\n",
261 chip_count * Z2RAM_CHUNK1024);
262
263 break;
264
265 default:
266 rc = -ENODEV;
267 goto err_out;
268
269 break;
270 }
271
272 if (z2ram_size == 0) {
273 printk(KERN_NOTICE DEVICE_NAME
274 ": no unused ZII/Chip RAM found\n");
275 goto err_out_kfree;
276 }
277
278 current_device = device;
279 z2ram_size <<= Z2RAM_CHUNKSHIFT;
280 set_capacity(z2ram_gendisk[device], z2ram_size >> 9);
281 }
282
283 mutex_unlock(&z2ram_mutex);
284 return 0;
285
286 err_out_kfree:
287 kfree(z2ram_map);
288 err_out:
289 mutex_unlock(&z2ram_mutex);
290 return rc;
291 }
292
z2_release(struct gendisk * disk,fmode_t mode)293 static void z2_release(struct gendisk *disk, fmode_t mode)
294 {
295 mutex_lock(&z2ram_mutex);
296 if (current_device == -1) {
297 mutex_unlock(&z2ram_mutex);
298 return;
299 }
300 mutex_unlock(&z2ram_mutex);
301 /*
302 * FIXME: unmap memory
303 */
304 }
305
306 static const struct block_device_operations z2_fops = {
307 .owner = THIS_MODULE,
308 .open = z2_open,
309 .release = z2_release,
310 };
311
312 static struct blk_mq_tag_set tag_set;
313
314 static const struct blk_mq_ops z2_mq_ops = {
315 .queue_rq = z2_queue_rq,
316 };
317
z2ram_register_disk(int minor)318 static int z2ram_register_disk(int minor)
319 {
320 struct gendisk *disk;
321 int err;
322
323 disk = blk_mq_alloc_disk(&tag_set, NULL);
324 if (IS_ERR(disk))
325 return PTR_ERR(disk);
326
327 disk->major = Z2RAM_MAJOR;
328 disk->first_minor = minor;
329 disk->minors = 1;
330 disk->fops = &z2_fops;
331 if (minor)
332 sprintf(disk->disk_name, "z2ram%d", minor);
333 else
334 sprintf(disk->disk_name, "z2ram");
335
336 z2ram_gendisk[minor] = disk;
337 err = add_disk(disk);
338 if (err)
339 blk_cleanup_disk(disk);
340 return err;
341 }
342
z2_init(void)343 static int __init z2_init(void)
344 {
345 int ret, i;
346
347 if (!MACH_IS_AMIGA)
348 return -ENODEV;
349
350 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
351 return -EBUSY;
352
353 tag_set.ops = &z2_mq_ops;
354 tag_set.nr_hw_queues = 1;
355 tag_set.nr_maps = 1;
356 tag_set.queue_depth = 16;
357 tag_set.numa_node = NUMA_NO_NODE;
358 tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
359 ret = blk_mq_alloc_tag_set(&tag_set);
360 if (ret)
361 goto out_unregister_blkdev;
362
363 for (i = 0; i < Z2MINOR_COUNT; i++) {
364 ret = z2ram_register_disk(i);
365 if (ret && i == 0)
366 goto out_free_tagset;
367 }
368
369 return 0;
370
371 out_free_tagset:
372 blk_mq_free_tag_set(&tag_set);
373 out_unregister_blkdev:
374 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
375 return ret;
376 }
377
z2_exit(void)378 static void __exit z2_exit(void)
379 {
380 int i, j;
381
382 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
383
384 for (i = 0; i < Z2MINOR_COUNT; i++) {
385 del_gendisk(z2ram_gendisk[i]);
386 blk_cleanup_queue(z2ram_gendisk[i]->queue);
387 put_disk(z2ram_gendisk[i]);
388 }
389 blk_mq_free_tag_set(&tag_set);
390
391 if (current_device != -1) {
392 i = 0;
393
394 for (j = 0; j < z2_count; j++) {
395 set_bit(i++, zorro_unused_z2ram);
396 }
397
398 for (j = 0; j < chip_count; j++) {
399 if (z2ram_map[i]) {
400 amiga_chip_free((void *)z2ram_map[i++]);
401 }
402 }
403
404 if (z2ram_map != NULL) {
405 kfree(z2ram_map);
406 }
407 }
408
409 return;
410 }
411
412 module_init(z2_init);
413 module_exit(z2_exit);
414 MODULE_LICENSE("GPL");
415