summaryrefslogtreecommitdiff
path: root/drivers/scsi/gvp11.c
blob: dbe4cc6b9f8b75be0823653fb05dd8e15e279cc9 (plain)
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
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
#include <linux/types.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/zorro.h>
#include <linux/module.h>

#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>

#include "scsi.h"
#include "wd33c93.h"
#include "gvp11.h"


#define CHECK_WD33C93

struct gvp11_hostdata {
	struct WD33C93_hostdata wh;
	struct gvp11_scsiregs *regs;
};

static irqreturn_t gvp11_intr(int irq, void *data)
{
	struct Scsi_Host *instance = data;
	struct gvp11_hostdata *hdata = shost_priv(instance);
	unsigned int status = hdata->regs->CNTR;
	unsigned long flags;

	if (!(status & GVP11_DMAC_INT_PENDING))
		return IRQ_NONE;

	spin_lock_irqsave(instance->host_lock, flags);
	wd33c93_intr(instance);
	spin_unlock_irqrestore(instance->host_lock, flags);
	return IRQ_HANDLED;
}

static int gvp11_xfer_mask = 0;

void gvp11_setup(char *str, int *ints)
{
	gvp11_xfer_mask = ints[1];
}

static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
	struct Scsi_Host *instance = cmd->device->host;
	struct gvp11_hostdata *hdata = shost_priv(instance);
	struct WD33C93_hostdata *wh = &hdata->wh;
	struct gvp11_scsiregs *regs = hdata->regs;
	unsigned short cntr = GVP11_DMAC_INT_ENABLE;
	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	int bank_mask;
	static int scsi_alloc_out_of_range = 0;

	/* use bounce buffer if the physical address is bad */
	if (addr & wh->dma_xfer_mask) {
		wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;

		if (!scsi_alloc_out_of_range) {
			wh->dma_bounce_buffer =
				kmalloc(wh->dma_bounce_len, GFP_KERNEL);
			wh->dma_buffer_pool = BUF_SCSI_ALLOCED;
		}

		if (scsi_alloc_out_of_range ||
		    !wh->dma_bounce_buffer) {
			wh->dma_bounce_buffer =
				amiga_chip_alloc(wh->dma_bounce_len,
						 "GVP II SCSI Bounce Buffer");

			if (!wh->dma_bounce_buffer) {
				wh->dma_bounce_len = 0;
				return 1;
			}

			wh->dma_buffer_pool = BUF_CHIP_ALLOCED;
		}

		/* check if the address of the bounce buffer is OK */
		addr = virt_to_bus(wh->dma_bounce_buffer);

		if (addr & wh->dma_xfer_mask) {
			/* fall back to Chip RAM if address out of range */
			if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) {
				kfree(wh->dma_bounce_buffer);
				scsi_alloc_out_of_range = 1;
			} else {
				amiga_chip_free(wh->dma_bounce_buffer);
			}

			wh->dma_bounce_buffer =
				amiga_chip_alloc(wh->dma_bounce_len,
						 "GVP II SCSI Bounce Buffer");

			if (!wh->dma_bounce_buffer) {
				wh->dma_bounce_len = 0;
				return 1;
			}

			addr = virt_to_bus(wh->dma_bounce_buffer);
			wh->dma_buffer_pool = BUF_CHIP_ALLOCED;
		}

		if (!dir_in) {
			/* copy to bounce buffer for a write */
			memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
			       cmd->SCp.this_residual);
		}
	}

	/* setup dma direction */
	if (!dir_in)
		cntr |= GVP11_DMAC_DIR_WRITE;

	wh->dma_dir = dir_in;
	regs->CNTR = cntr;

	/* setup DMA *physical* address */
	regs->ACR = addr;

	if (dir_in) {
		/* invalidate any cache */
		cache_clear(addr, cmd->SCp.this_residual);
	} else {
		/* push any dirty cache */
		cache_push(addr, cmd->SCp.this_residual);
	}

	bank_mask = (~wh->dma_xfer_mask >> 18) & 0x01c0;
	if (bank_mask)
		regs->BANK = bank_mask & (addr >> 18);

	/* start DMA */
	regs->ST_DMA = 1;

	/* return success */
	return 0;
}

static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
		     int status)
{
	struct gvp11_hostdata *hdata = shost_priv(instance);
	struct WD33C93_hostdata *wh = &hdata->wh;
	struct gvp11_scsiregs *regs = hdata->regs;

	/* stop DMA */
	regs->SP_DMA = 1;
	/* remove write bit from CONTROL bits */
	regs->CNTR = GVP11_DMAC_INT_ENABLE;

	/* copy from a bounce buffer, if necessary */
	if (status && wh->dma_bounce_buffer) {
		if (wh->dma_dir && SCpnt)
			memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
			       SCpnt->SCp.this_residual);

		if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED)
			kfree(wh->dma_bounce_buffer);
		else
			amiga_chip_free(wh->dma_bounce_buffer);

		wh->dma_bounce_buffer = NULL;
		wh->dma_bounce_len = 0;
	}
}

static int gvp11_bus_reset(struct scsi_cmnd *cmd)
{
	struct Scsi_Host *instance = cmd->device->host;

	/* FIXME perform bus-specific reset */

	/* FIXME 2: shouldn't we no-op this function (return
	   FAILED), and fall back to host reset function,
	   wd33c93_host_reset ? */

	spin_lock_irq(instance->host_lock);
	wd33c93_host_reset(cmd);
	spin_unlock_irq(instance->host_lock);

	return SUCCESS;
}

static struct scsi_host_template gvp11_scsi_template = {
	.module			= THIS_MODULE,
	.name			= "GVP Series II SCSI",
	.proc_info		= wd33c93_proc_info,
	.proc_name		= "GVP11",
	.queuecommand		= wd33c93_queuecommand,
	.eh_abort_handler	= wd33c93_abort,
	.eh_bus_reset_handler	= gvp11_bus_reset,
	.eh_host_reset_handler	= wd33c93_host_reset,
	.can_queue		= CAN_QUEUE,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= CMD_PER_LUN,
	.use_clustering		= DISABLE_CLUSTERING
};

static int check_wd33c93(struct gvp11_scsiregs *regs)
{
#ifdef CHECK_WD33C93
	volatile unsigned char *sasr_3393, *scmd_3393;
	unsigned char save_sasr;
	unsigned char q, qq;

	/*
	 * These darn GVP boards are a problem - it can be tough to tell
	 * whether or not they include a SCSI controller. This is the
	 * ultimate Yet-Another-GVP-Detection-Hack in that it actually
	 * probes for a WD33c93 chip: If we find one, it's extremely
	 * likely that this card supports SCSI, regardless of Product_
	 * Code, Board_Size, etc.
	 */

	/* Get pointers to the presumed register locations and save contents */

	sasr_3393 = &regs->SASR;
	scmd_3393 = &regs->SCMD;
	save_sasr = *sasr_3393;

	/* First test the AuxStatus Reg */

	q = *sasr_3393;	/* read it */
	if (q & 0x08)	/* bit 3 should always be clear */
		return -ENODEV;
	*sasr_3393 = WD_AUXILIARY_STATUS;	/* setup indirect address */
	if (*sasr_3393 == WD_AUXILIARY_STATUS) {	/* shouldn't retain the write */
		*sasr_3393 = save_sasr;	/* Oops - restore this byte */
		return -ENODEV;
	}
	if (*sasr_3393 != q) {	/* should still read the same */
		*sasr_3393 = save_sasr;	/* Oops - restore this byte */
		return -ENODEV;
	}
	if (*scmd_3393 != q)	/* and so should the image at 0x1f */
		return -ENODEV;

	/*
	 * Ok, we probably have a wd33c93, but let's check a few other places
	 * for good measure. Make sure that this works for both 'A and 'B
	 * chip versions.
	 */

	*sasr_3393 = WD_SCSI_STATUS;
	q = *scmd_3393;
	*sasr_3393 = WD_SCSI_STATUS;
	*scmd_3393 = ~q;
	*sasr_3393 = WD_SCSI_STATUS;
	qq = *scmd_3393;
	*sasr_3393 = WD_SCSI_STATUS;
	*scmd_3393 = q;
	if (qq != q)	/* should be read only */
		return -ENODEV;
	*sasr_3393 = 0x1e;	/* this register is unimplemented */
	q = *scmd_3393;
	*sasr_3393 = 0x1e;
	*scmd_3393 = ~q;
	*sasr_3393 = 0x1e;
	qq = *scmd_3393;
	*sasr_3393 = 0x1e;
	*scmd_3393 = q;
	if (qq != q || qq != 0xff)	/* should be read only, all 1's */
		return -ENODEV;
	*sasr_3393 = WD_TIMEOUT_PERIOD;
	q = *scmd_3393;
	*sasr_3393 = WD_TIMEOUT_PERIOD;
	*scmd_3393 = ~q;
	*sasr_3393 = WD_TIMEOUT_PERIOD;
	qq = *scmd_3393;
	*sasr_3393 = WD_TIMEOUT_PERIOD;
	*scmd_3393 = q;
	if (qq != (~q & 0xff))	/* should be read/write */
		return -ENODEV;
#endif /* CHECK_WD33C93 */

	return 0;
}

static int gvp11_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
{
	struct Scsi_Host *instance;
	unsigned long address;
	int error;
	unsigned int epc;
	unsigned int default_dma_xfer_mask;
	struct gvp11_hostdata *hdata;
	struct gvp11_scsiregs *regs;
	wd33c93_regs wdregs;

	default_dma_xfer_mask = ent->driver_data;

	/*
	 * Rumors state that some GVP ram boards use the same product
	 * code as the SCSI controllers. Therefore if the board-size
	 * is not 64KB we assume it is a ram board and bail out.
	 */
	if (zorro_resource_len(z) != 0x10000)
		return -ENODEV;

	address = z->resource.start;
	if (!request_mem_region(address, 256, "wd33c93"))
		return -EBUSY;

	regs = (struct gvp11_scsiregs *)(ZTWO_VADDR(address));

	error = check_wd33c93(regs);
	if (error)
		goto fail_check_or_alloc;

	instance = scsi_host_alloc(&gvp11_scsi_template,
				   sizeof(struct gvp11_hostdata));
	if (!instance) {
		error = -ENOMEM;
		goto fail_check_or_alloc;
	}

	instance->irq = IRQ_AMIGA_PORTS;
	instance->unique_id = z->slotaddr;

	regs->secret2 = 1;
	regs->secret1 = 0;
	regs->secret3 = 15;
	while (regs->CNTR & GVP11_DMAC_BUSY)
		;
	regs->CNTR = 0;
	regs->BANK = 0;

	wdregs.SASR = &regs->SASR;
	wdregs.SCMD = &regs->SCMD;

	hdata = shost_priv(instance);
	if (gvp11_xfer_mask)
		hdata->wh.dma_xfer_mask = gvp11_xfer_mask;
	else
		hdata->wh.dma_xfer_mask = default_dma_xfer_mask;

	hdata->wh.no_sync = 0xff;
	hdata->wh.fast = 0;
	hdata->wh.dma_mode = CTRL_DMA;
	hdata->regs = regs;

	/*
	 * Check for 14MHz SCSI clock
	 */
	epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);
	wd33c93_init(instance, wdregs, dma_setup, dma_stop,
		     (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
					     : WD33C93_FS_12_15);

	error = request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED,
			    "GVP11 SCSI", instance);
	if (error)
		goto fail_irq;

	regs->CNTR = GVP11_DMAC_INT_ENABLE;

	error = scsi_add_host(instance, NULL);
	if (error)
		goto fail_host;

	zorro_set_drvdata(z, instance);
	scsi_scan_host(instance);
	return 0;

fail_host:
	free_irq(IRQ_AMIGA_PORTS, instance);
fail_irq:
	scsi_host_put(instance);
fail_check_or_alloc:
	release_mem_region(address, 256);
	return error;
}

static void gvp11_remove(struct zorro_dev *z)
{
	struct Scsi_Host *instance = zorro_get_drvdata(z);
	struct gvp11_hostdata *hdata = shost_priv(instance);

	hdata->regs->CNTR = 0;
	scsi_remove_host(instance);
	free_irq(IRQ_AMIGA_PORTS, instance);
	scsi_host_put(instance);
	release_mem_region(z->resource.start, 256);
}

	/*
	 * This should (hopefully) be the correct way to identify
	 * all the different GVP SCSI controllers (except for the
	 * SERIES I though).
	 */

static struct zorro_device_id gvp11_zorro_tbl[] = {
	{ ZORRO_PROD_GVP_COMBO_030_R3_SCSI,	~0x00ffffff },
	{ ZORRO_PROD_GVP_SERIES_II,		~0x00ffffff },
	{ ZORRO_PROD_GVP_GFORCE_030_SCSI,	~0x01ffffff },
	{ ZORRO_PROD_GVP_A530_SCSI,		~0x01ffffff },
	{ ZORRO_PROD_GVP_COMBO_030_R4_SCSI,	~0x01ffffff },
	{ ZORRO_PROD_GVP_A1291,			~0x07ffffff },
	{ ZORRO_PROD_GVP_GFORCE_040_SCSI_1,	~0x07ffffff },
	{ 0 }
};
MODULE_DEVICE_TABLE(zorro, gvp11_zorro_tbl);

static struct zorro_driver gvp11_driver = {
	.name		= "gvp11",
	.id_table	= gvp11_zorro_tbl,
	.probe		= gvp11_probe,
	.remove		= gvp11_remove,
};

static int __init gvp11_init(void)
{
	return zorro_register_driver(&gvp11_driver);
}
module_init(gvp11_init);

static void __exit gvp11_exit(void)
{
	zorro_unregister_driver(&gvp11_driver);
}
module_exit(gvp11_exit);

MODULE_DESCRIPTION("GVP Series II SCSI");
MODULE_LICENSE("GPL");