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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 ([email protected])
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
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 gendisk *disk, blk_mode_t mode)
144{
145 int device = disk->first_minor;
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 mutex_lock(&z2ram_mutex);
152 if (current_device != -1 && current_device != device) {
153 rc = -EBUSY;
154 goto err_out;
155 }
156
157 if (current_device == -1) {
158 z2_count = 0;
159 chip_count = 0;
160 list_count = 0;
161 z2ram_size = 0;
162
163 /* Use a specific list entry. */
164 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
165 int index = device - Z2MINOR_MEMLIST1 + 1;
166 unsigned long size, paddr, vaddr;
167
168 if (index >= m68k_realnum_memory) {
169 printk(KERN_ERR DEVICE_NAME
170 ": no such entry in z2ram_map\n");
171 goto err_out;
172 }
173
174 paddr = m68k_memory[index].addr;
175 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE - 1);
176
177#ifdef __powerpc__
178 /* FIXME: ioremap doesn't build correct memory tables. */
179 {
180 vfree(vmalloc(size));
181 }
182
183 vaddr = (unsigned long)ioremap_wt(paddr, size);
184
185#else
186 vaddr =
187 (unsigned long)z_remap_nocache_nonser(paddr, size);
188#endif
189 z2ram_map =
190 kmalloc_objs(z2ram_map[0], size / Z2RAM_CHUNKSIZE);
191 if (z2ram_map == NULL) {
192 printk(KERN_ERR DEVICE_NAME
193 ": cannot get mem for z2ram_map\n");
194 goto err_out;
195 }
196
197 while (size) {
198 z2ram_map[z2ram_size++] = vaddr;
199 size -= Z2RAM_CHUNKSIZE;
200 vaddr += Z2RAM_CHUNKSIZE;
201 list_count++;
202 }
203
204 if (z2ram_size != 0)
205 printk(KERN_INFO DEVICE_NAME
206 ": using %iK List Entry %d Memory\n",
207 list_count * Z2RAM_CHUNK1024, index);
208 } else
209 switch (device) {
210 case Z2MINOR_COMBINED:
211
212 z2ram_map =
213 kmalloc(max_z2_map + max_chip_map,
214 GFP_KERNEL);
215 if (z2ram_map == NULL) {
216 printk(KERN_ERR DEVICE_NAME
217 ": cannot get mem for z2ram_map\n");
218 goto err_out;
219 }
220
221 get_z2ram();
222 get_chipram();
223
224 if (z2ram_size != 0)
225 printk(KERN_INFO DEVICE_NAME
226 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
227 z2_count * Z2RAM_CHUNK1024,
228 chip_count * Z2RAM_CHUNK1024,
229 (z2_count +
230 chip_count) * Z2RAM_CHUNK1024);
231
232 break;
233
234 case Z2MINOR_Z2ONLY:
235 z2ram_map = kmalloc(max_z2_map, GFP_KERNEL);
236 if (!z2ram_map)
237 goto err_out;
238
239 get_z2ram();
240
241 if (z2ram_size != 0)
242 printk(KERN_INFO DEVICE_NAME
243 ": using %iK of Zorro II RAM\n",
244 z2_count * Z2RAM_CHUNK1024);
245
246 break;
247
248 case Z2MINOR_CHIPONLY:
249 z2ram_map = kmalloc(max_chip_map, GFP_KERNEL);
250 if (!z2ram_map)
251 goto err_out;
252
253 get_chipram();
254
255 if (z2ram_size != 0)
256 printk(KERN_INFO DEVICE_NAME
257 ": using %iK Chip RAM\n",
258 chip_count * Z2RAM_CHUNK1024);
259
260 break;
261
262 default:
263 rc = -ENODEV;
264 goto err_out;
265
266 break;
267 }
268
269 if (z2ram_size == 0) {
270 printk(KERN_NOTICE DEVICE_NAME
271 ": no unused ZII/Chip RAM found\n");
272 goto err_out_kfree;
273 }
274
275 current_device = device;
276 z2ram_size <<= Z2RAM_CHUNKSHIFT;
277 set_capacity(z2ram_gendisk[device], z2ram_size >> 9);
278 }
279
280 mutex_unlock(&z2ram_mutex);
281 return 0;
282
283err_out_kfree:
284 kfree(z2ram_map);
285err_out:
286 mutex_unlock(&z2ram_mutex);
287 return rc;
288}
289
290static void z2_release(struct gendisk *disk)
291{
292 mutex_lock(&z2ram_mutex);
293 if (current_device == -1) {
294 mutex_unlock(&z2ram_mutex);
295 return;
296 }
297 mutex_unlock(&z2ram_mutex);
298 /*
299 * FIXME: unmap memory
300 */
301}
302
303static const struct block_device_operations z2_fops = {
304 .owner = THIS_MODULE,
305 .open = z2_open,
306 .release = z2_release,
307};
308
309static struct blk_mq_tag_set tag_set;
310
311static const struct blk_mq_ops z2_mq_ops = {
312 .queue_rq = z2_queue_rq,
313};
314
315static int z2ram_register_disk(int minor)
316{
317 struct gendisk *disk;
318 int err;
319
320 disk = blk_mq_alloc_disk(&tag_set, NULL, NULL);
321 if (IS_ERR(disk))
322 return PTR_ERR(disk);
323
324 disk->major = Z2RAM_MAJOR;
325 disk->first_minor = minor;
326 disk->minors = 1;
327 disk->flags |= GENHD_FL_NO_PART;
328 disk->fops = &z2_fops;
329 if (minor)
330 sprintf(disk->disk_name, "z2ram%d", minor);
331 else
332 sprintf(disk->disk_name, "z2ram");
333
334 z2ram_gendisk[minor] = disk;
335 err = add_disk(disk);
336 if (err)
337 put_disk(disk);
338 return err;
339}
340
341static int __init z2_init(void)
342{
343 int ret, i;
344
345 if (!MACH_IS_AMIGA)
346 return -ENODEV;
347
348 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
349 return -EBUSY;
350
351 tag_set.ops = &z2_mq_ops;
352 tag_set.nr_hw_queues = 1;
353 tag_set.nr_maps = 1;
354 tag_set.queue_depth = 16;
355 tag_set.numa_node = NUMA_NO_NODE;
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 put_disk(z2ram_gendisk[i]);
384 }
385 blk_mq_free_tag_set(&tag_set);
386
387 if (current_device != -1) {
388 i = 0;
389
390 for (j = 0; j < z2_count; j++) {
391 set_bit(i++, zorro_unused_z2ram);
392 }
393
394 for (j = 0; j < chip_count; j++) {
395 if (z2ram_map[i]) {
396 amiga_chip_free((void *)z2ram_map[i++]);
397 }
398 }
399
400 if (z2ram_map != NULL) {
401 kfree(z2ram_map);
402 }
403 }
404
405 return;
406}
407
408module_init(z2_init);
409module_exit(z2_exit);
410MODULE_DESCRIPTION("Amiga Zorro II ramdisk driver");
411MODULE_LICENSE("GPL");