1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
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)
53
54#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
55
56static DEFINE_MUTEX(z2ram_mutex);
57static u_long *z2ram_map = NULL;
58static u_long z2ram_size = 0;
59static int z2_count = 0;
60static int chip_count = 0;
61static int list_count = 0;
62static int current_device = -1;
63
64static DEFINE_SPINLOCK(z2ram_lock);
65
66static struct gendisk *z2ram_gendisk[Z2MINOR_COUNT];
67
68static 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
108static 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
125static 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
143static 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
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
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
286err_out_kfree:
287 kfree(z2ram_map);
288err_out:
289 mutex_unlock(&z2ram_mutex);
290 return rc;
291}
292
293static 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
303
304}
305
306static const struct block_device_operations z2_fops = {
307 .owner = THIS_MODULE,
308 .open = z2_open,
309 .release = z2_release,
310};
311
312static struct blk_mq_tag_set tag_set;
313
314static const struct blk_mq_ops z2_mq_ops = {
315 .queue_rq = z2_queue_rq,
316};
317
318static int z2ram_register_disk(int minor)
319{
320 struct gendisk *disk;
321
322 disk = blk_mq_alloc_disk(&tag_set, NULL);
323 if (IS_ERR(disk))
324 return PTR_ERR(disk);
325
326 disk->major = Z2RAM_MAJOR;
327 disk->first_minor = minor;
328 disk->minors = 1;
329 disk->fops = &z2_fops;
330 if (minor)
331 sprintf(disk->disk_name, "z2ram%d", minor);
332 else
333 sprintf(disk->disk_name, "z2ram");
334
335 z2ram_gendisk[minor] = disk;
336 add_disk(disk);
337 return 0;
338}
339
340static int __init z2_init(void)
341{
342 int ret, i;
343
344 if (!MACH_IS_AMIGA)
345 return -ENODEV;
346
347 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
348 return -EBUSY;
349
350 tag_set.ops = &z2_mq_ops;
351 tag_set.nr_hw_queues = 1;
352 tag_set.nr_maps = 1;
353 tag_set.queue_depth = 16;
354 tag_set.numa_node = NUMA_NO_NODE;
355 tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
356 ret = blk_mq_alloc_tag_set(&tag_set);
357 if (ret)
358 goto out_unregister_blkdev;
359
360 for (i = 0; i < Z2MINOR_COUNT; i++) {
361 ret = z2ram_register_disk(i);
362 if (ret && i == 0)
363 goto out_free_tagset;
364 }
365
366 return 0;
367
368out_free_tagset:
369 blk_mq_free_tag_set(&tag_set);
370out_unregister_blkdev:
371 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
372 return ret;
373}
374
375static void __exit z2_exit(void)
376{
377 int i, j;
378
379 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
380
381 for (i = 0; i < Z2MINOR_COUNT; i++) {
382 del_gendisk(z2ram_gendisk[i]);
383 blk_cleanup_queue(z2ram_gendisk[i]->queue);
384 put_disk(z2ram_gendisk[i]);
385 }
386 blk_mq_free_tag_set(&tag_set);
387
388 if (current_device != -1) {
389 i = 0;
390
391 for (j = 0; j < z2_count; j++) {
392 set_bit(i++, zorro_unused_z2ram);
393 }
394
395 for (j = 0; j < chip_count; j++) {
396 if (z2ram_map[i]) {
397 amiga_chip_free((void *)z2ram_map[i++]);
398 }
399 }
400
401 if (z2ram_map != NULL) {
402 kfree(z2ram_map);
403 }
404 }
405
406 return;
407}
408
409module_init(z2_init);
410module_exit(z2_exit);
411MODULE_LICENSE("GPL");
412
