summaryrefslogtreecommitdiff
path: root/drivers/scsi/gvp11.c
blob: 2f6c1137a6e5ffb5fa45c39728be80e954b0bb4f (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
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/interrupt.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <linux/zorro.h>
#include <asm/irq.h>
#include <linux/spinlock.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#include "gvp11.h"

#include<linux/stat.h>

#define DMA(ptr) ((gvp11_scsiregs *)((ptr)->base))
#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))

static irqreturn_t gvp11_intr (int irq, void *_instance)
{
    unsigned long flags;
    unsigned int status;
    struct Scsi_Host *instance = (struct Scsi_Host *)_instance;

    status = DMA(instance)->CNTR;
    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)
{
    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 & HDATA(cmd->device->host)->dma_xfer_mask ||
	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
    {
	HDATA(cmd->device->host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	    & ~0x1ff;

 	if( !scsi_alloc_out_of_range ) {
	    HDATA(cmd->device->host)->dma_bounce_buffer =
		kmalloc (HDATA(cmd->device->host)->dma_bounce_len, GFP_KERNEL);
	    HDATA(cmd->device->host)->dma_buffer_pool = BUF_SCSI_ALLOCED;
	}

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

	    if(!HDATA(cmd->device->host)->dma_bounce_buffer)
	    {
		HDATA(cmd->device->host)->dma_bounce_len = 0;
		return 1;
	    }

	    HDATA(cmd->device->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
	}

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

	if (addr & HDATA(cmd->device->host)->dma_xfer_mask) {
	    /* fall back to Chip RAM if address out of range */
	    if( HDATA(cmd->device->host)->dma_buffer_pool == BUF_SCSI_ALLOCED) {
		kfree (HDATA(cmd->device->host)->dma_bounce_buffer);
		scsi_alloc_out_of_range = 1;
	    } else {
		amiga_chip_free (HDATA(cmd->device->host)->dma_bounce_buffer);
            }
		
	    HDATA(cmd->device->host)->dma_bounce_buffer =
		amiga_chip_alloc(HDATA(cmd->device->host)->dma_bounce_len,
				       "GVP II SCSI Bounce Buffer");

	    if(!HDATA(cmd->device->host)->dma_bounce_buffer)
	    {
		HDATA(cmd->device->host)->dma_bounce_len = 0;
		return 1;
	    }

	    addr = virt_to_bus(HDATA(cmd->device->host)->dma_bounce_buffer);
	    HDATA(cmd->device->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
	}
	    
	if (!dir_in) {
	    /* copy to bounce buffer for a write */
	    memcpy (HDATA(cmd->device->host)->dma_bounce_buffer,
		    cmd->SCp.ptr, cmd->SCp.this_residual);
	}
    }

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

    HDATA(cmd->device->host)->dma_dir = dir_in;
    DMA(cmd->device->host)->CNTR = cntr;

    /* setup DMA *physical* address */
    DMA(cmd->device->host)->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);

    if ((bank_mask = (~HDATA(cmd->device->host)->dma_xfer_mask >> 18) & 0x01c0))
	    DMA(cmd->device->host)->BANK = bank_mask & (addr >> 18);

    /* start DMA */
    DMA(cmd->device->host)->ST_DMA = 1;

    /* return success */
    return 0;
}

static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
		     int status)
{
    /* stop DMA */
    DMA(instance)->SP_DMA = 1;
    /* remove write bit from CONTROL bits */
    DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;

    /* copy from a bounce buffer, if necessary */
    if (status && HDATA(instance)->dma_bounce_buffer) {
	if (HDATA(instance)->dma_dir && SCpnt)
	    memcpy (SCpnt->SCp.ptr, 
		    HDATA(instance)->dma_bounce_buffer,
		    SCpnt->SCp.this_residual);
	
	if (HDATA(instance)->dma_buffer_pool == BUF_SCSI_ALLOCED)
	    kfree (HDATA(instance)->dma_bounce_buffer);
	else
	    amiga_chip_free(HDATA(instance)->dma_bounce_buffer);
	
	HDATA(instance)->dma_bounce_buffer = NULL;
	HDATA(instance)->dma_bounce_len = 0;
    }
}

#define CHECK_WD33C93

int __init gvp11_detect(struct scsi_host_template *tpnt)
{
    static unsigned char called = 0;
    struct Scsi_Host *instance;
    unsigned long address;
    unsigned int epc;
    struct zorro_dev *z = NULL;
    unsigned int default_dma_xfer_mask;
    wd33c93_regs regs;
    int num_gvp11 = 0;
#ifdef CHECK_WD33C93
    volatile unsigned char *sasr_3393, *scmd_3393;
    unsigned char save_sasr;
    unsigned char q, qq;
#endif

    if (!MACH_IS_AMIGA || called)
	return 0;
    called = 1;

    tpnt->proc_name = "GVP11";
    tpnt->proc_info = &wd33c93_proc_info;

    while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
	/* 
	 * This should (hopefully) be the correct way to identify
	 * all the different GVP SCSI controllers (except for the
	 * SERIES I though).
	 */

	if (z->id == ZORRO_PROD_GVP_COMBO_030_R3_SCSI ||
	    z->id == ZORRO_PROD_GVP_SERIES_II)
	    default_dma_xfer_mask = ~0x00ffffff;
	else if (z->id == ZORRO_PROD_GVP_GFORCE_030_SCSI ||
		 z->id == ZORRO_PROD_GVP_A530_SCSI ||
		 z->id == ZORRO_PROD_GVP_COMBO_030_R4_SCSI)
	    default_dma_xfer_mask = ~0x01ffffff;
	else if (z->id == ZORRO_PROD_GVP_A1291 ||
		 z->id == ZORRO_PROD_GVP_GFORCE_040_SCSI_1)
	    default_dma_xfer_mask = ~0x07ffffff;
	else
	    continue;

	/*
	 * 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 asume it is a ram board and bail out.
	 */
	if (z->resource.end-z->resource.start != 0xffff)
		continue;

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

#ifdef CHECK_WD33C93

	/*
	 * 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 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SASR);
	scmd_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SCMD);
	save_sasr = *sasr_3393;

    /* First test the AuxStatus Reg */

	q = *sasr_3393;		/* read it */
	if (q & 0x08)		/* bit 3 should always be clear */
		goto release;
	*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 */
		goto release;
		}
	if (*sasr_3393 != q) {	/* should still read the same */
		*sasr_3393 = save_sasr;	/* Oops - restore this byte */
		goto release;
		}
	if (*scmd_3393 != q)	/* and so should the image at 0x1f */
		goto release;


    /* 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 */
		goto release;
	*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 */
		goto release;
	*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 */
		goto release;
#endif

	instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
	if(instance == NULL)
		goto release;
	instance->base = ZTWO_VADDR(address);
	instance->irq = IRQ_AMIGA_PORTS;
	instance->unique_id = z->slotaddr;

	if (gvp11_xfer_mask)
		HDATA(instance)->dma_xfer_mask = gvp11_xfer_mask;
	else
		HDATA(instance)->dma_xfer_mask = default_dma_xfer_mask;


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

	DMA(instance)->BANK = 0;

	epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);

	/*
	 * Check for 14MHz SCSI clock
	 */
	regs.SASR = &(DMA(instance)->SASR);
	regs.SCMD = &(DMA(instance)->SCMD);
	wd33c93_init(instance, regs, dma_setup, dma_stop,
		     (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
					     : WD33C93_FS_12_15);

	request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED, "GVP11 SCSI",
		    instance);
	DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
	num_gvp11++;
	continue;

release:
	release_mem_region(address, 256);
    }

    return num_gvp11;
}

static int gvp11_bus_reset(struct scsi_cmnd *cmd)
{
	/* 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(cmd->device->host->host_lock);
	wd33c93_host_reset(cmd);
	spin_unlock_irq(cmd->device->host->host_lock);

	return SUCCESS;
}


#define HOSTS_C

#include "gvp11.h"

static struct scsi_host_template driver_template = {
	.proc_name		= "GVP11",
	.name			= "GVP Series II SCSI",
	.detect			= gvp11_detect,
	.release		= gvp11_release,
	.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
};


#include "scsi_module.c"

int gvp11_release(struct Scsi_Host *instance)
{
#ifdef MODULE
    DMA(instance)->CNTR = 0;
    release_mem_region(ZTWO_PADDR(instance->base), 256);
    free_irq(IRQ_AMIGA_PORTS, instance);
    wd33c93_release();
#endif
    return 1;
}

MODULE_LICENSE("GPL");