summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/cyberstorm.c
blob: a4a4fac5c0a11454473f53bf26056e40ef43c8dd (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
/* cyberstorm.c: Driver for CyberStorm SCSI Controller.
 *
 * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
 *
 * The CyberStorm SCSI driver is based on David S. Miller's ESP driver
 * for the Sparc computers. 
 * 
 * This work was made possible by Phase5 who willingly (and most generously)
 * supported me with hardware and all the information I needed.
 */

/* TODO:
 *
 * 1) Figure out how to make a cleaner merge with the sparc driver with regard
 *    to the caches and the Sparc MMU mapping.
 * 2) Make as few routines required outside the generic driver. A lot of the
 *    routines in this file used to be inline!
 */

#include <linux/module.h>

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/interrupt.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "NCR53C9x.h"

#include <linux/zorro.h>
#include <asm/irq.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>

#include <asm/pgtable.h>

/* The controller registers can be found in the Z2 config area at these
 * offsets:
 */
#define CYBER_ESP_ADDR 0xf400
#define CYBER_DMA_ADDR 0xf800


/* The CyberStorm DMA interface */
struct cyber_dma_registers {
	volatile unsigned char dma_addr0;	/* DMA address (MSB) [0x000] */
	unsigned char dmapad1[1];
	volatile unsigned char dma_addr1;	/* DMA address       [0x002] */
	unsigned char dmapad2[1];
	volatile unsigned char dma_addr2;	/* DMA address       [0x004] */
	unsigned char dmapad3[1];
	volatile unsigned char dma_addr3;	/* DMA address (LSB) [0x006] */
	unsigned char dmapad4[0x3fb];
	volatile unsigned char cond_reg;        /* DMA cond    (ro)  [0x402] */
#define ctrl_reg  cond_reg			/* DMA control (wo)  [0x402] */
};

/* DMA control bits */
#define CYBER_DMA_LED    0x80	/* HD led control 1 = on */
#define CYBER_DMA_WRITE  0x40	/* DMA direction. 1 = write */
#define CYBER_DMA_Z3     0x20	/* 16 (Z2) or 32 (CHIP/Z3) bit DMA transfer */

/* DMA status bits */
#define CYBER_DMA_HNDL_INTR 0x80	/* DMA IRQ pending? */

/* The bits below appears to be Phase5 Debug bits only; they were not
 * described by Phase5 so using them may seem a bit stupid...
 */
#define CYBER_HOST_ID 0x02	/* If set, host ID should be 7, otherwise
				 * it should be 6.
				 */
#define CYBER_SLOW_CABLE 0x08	/* If *not* set, assume SLOW_CABLE */

static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
static int  dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp);
static void dma_dump_state(struct NCR_ESP *esp);
static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length);
static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length);
static void dma_ints_off(struct NCR_ESP *esp);
static void dma_ints_on(struct NCR_ESP *esp);
static int  dma_irq_p(struct NCR_ESP *esp);
static void dma_led_off(struct NCR_ESP *esp);
static void dma_led_on(struct NCR_ESP *esp);
static int  dma_ports_p(struct NCR_ESP *esp);
static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write);

static unsigned char ctrl_data = 0;	/* Keep backup of the stuff written
				 * to ctrl_reg. Always write a copy
				 * to this register when writing to
				 * the hardware register!
				 */

static volatile unsigned char cmd_buffer[16];
				/* This is where all commands are put
				 * before they are transferred to the ESP chip
				 * via PIO.
				 */

/***************************************************************** Detection */
int __init cyber_esp_detect(struct scsi_host_template *tpnt)
{
	struct NCR_ESP *esp;
	struct zorro_dev *z = NULL;
	unsigned long address;

	while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
	    unsigned long board = z->resource.start;
	    if ((z->id == ZORRO_PROD_PHASE5_BLIZZARD_1220_CYBERSTORM ||
		 z->id == ZORRO_PROD_PHASE5_BLIZZARD_1230_II_FASTLANE_Z3_CYBERSCSI_CYBERSTORM060) &&
		request_mem_region(board+CYBER_ESP_ADDR,
		    		   sizeof(struct ESP_regs), "NCR53C9x")) {
		/* Figure out if this is a CyberStorm or really a 
		 * Fastlane/Blizzard Mk II by looking at the board size.
		 * CyberStorm maps 64kB
		 * (ZORRO_PROD_PHASE5_BLIZZARD_1220_CYBERSTORM does anyway)
		 */
		if(z->resource.end-board != 0xffff) {
			release_mem_region(board+CYBER_ESP_ADDR,
					   sizeof(struct ESP_regs));
			return 0;
		}
		esp = esp_allocate(tpnt, (void *)board+CYBER_ESP_ADDR);

		/* Do command transfer with programmed I/O */
		esp->do_pio_cmds = 1;

		/* Required functions */
		esp->dma_bytes_sent = &dma_bytes_sent;
		esp->dma_can_transfer = &dma_can_transfer;
		esp->dma_dump_state = &dma_dump_state;
		esp->dma_init_read = &dma_init_read;
		esp->dma_init_write = &dma_init_write;
		esp->dma_ints_off = &dma_ints_off;
		esp->dma_ints_on = &dma_ints_on;
		esp->dma_irq_p = &dma_irq_p;
		esp->dma_ports_p = &dma_ports_p;
		esp->dma_setup = &dma_setup;

		/* Optional functions */
		esp->dma_barrier = 0;
		esp->dma_drain = 0;
		esp->dma_invalidate = 0;
		esp->dma_irq_entry = 0;
		esp->dma_irq_exit = 0;
		esp->dma_led_on = &dma_led_on;
		esp->dma_led_off = &dma_led_off;
		esp->dma_poll = 0;
		esp->dma_reset = 0;

		/* SCSI chip speed */
		esp->cfreq = 40000000;

		/* The DMA registers on the CyberStorm are mapped
		 * relative to the device (i.e. in the same Zorro
		 * I/O block).
		 */
		address = (unsigned long)ZTWO_VADDR(board);
		esp->dregs = (void *)(address + CYBER_DMA_ADDR);

		/* ESP register base */
		esp->eregs = (struct ESP_regs *)(address + CYBER_ESP_ADDR);
		
		/* Set the command buffer */
		esp->esp_command = cmd_buffer;
		esp->esp_command_dvma = virt_to_bus((void *)cmd_buffer);

		esp->irq = IRQ_AMIGA_PORTS;
		request_irq(IRQ_AMIGA_PORTS, esp_intr, SA_SHIRQ,
			    "CyberStorm SCSI", esp->ehost);
		/* Figure out our scsi ID on the bus */
		/* The DMA cond flag contains a hardcoded jumper bit
		 * which can be used to select host number 6 or 7.
		 * However, even though it may change, we use a hardcoded
		 * value of 7.
		 */
		esp->scsi_id = 7;
		
		/* We don't have a differential SCSI-bus. */
		esp->diff = 0;

		esp_initialize(esp);

		printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
		esps_running = esps_in_use;
		return esps_in_use;
	    }
	}
	return 0;
}

/************************************************************* DMA Functions */
static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
{
	/* Since the CyberStorm DMA is fully dedicated to the ESP chip,
	 * the number of bytes sent (to the ESP chip) equals the number
	 * of bytes in the FIFO - there is no buffering in the DMA controller.
	 * XXXX Do I read this right? It is from host to ESP, right?
	 */
	return fifo_count;
}

static int dma_can_transfer(struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
	/* I don't think there's any limit on the CyberDMA. So we use what
	 * the ESP chip can handle (24 bit).
	 */
	unsigned long sz = sp->SCp.this_residual;
	if(sz > 0x1000000)
		sz = 0x1000000;
	return sz;
}

static void dma_dump_state(struct NCR_ESP *esp)
{
	ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
		esp->esp_id, ((struct cyber_dma_registers *)
			      (esp->dregs))->cond_reg));
	ESPLOG(("intreq:<%04x>, intena:<%04x>\n",
		amiga_custom.intreqr, amiga_custom.intenar));
}

static void dma_init_read(struct NCR_ESP *esp, __u32 addr, int length)
{
	struct cyber_dma_registers *dregs = 
		(struct cyber_dma_registers *) esp->dregs;

	cache_clear(addr, length);

	addr &= ~(1);
	dregs->dma_addr0 = (addr >> 24) & 0xff;
	dregs->dma_addr1 = (addr >> 16) & 0xff;
	dregs->dma_addr2 = (addr >>  8) & 0xff;
	dregs->dma_addr3 = (addr      ) & 0xff;
	ctrl_data &= ~(CYBER_DMA_WRITE);

	/* Check if physical address is outside Z2 space and of
	 * block length/block aligned in memory. If this is the
	 * case, enable 32 bit transfer. In all other cases, fall back
	 * to 16 bit transfer.
	 * Obviously 32 bit transfer should be enabled if the DMA address
	 * and length are 32 bit aligned. However, this leads to some
	 * strange behavior. Even 64 bit aligned addr/length fails.
	 * Until I've found a reason for this, 32 bit transfer is only
	 * used for full-block transfers (1kB).
	 *							-jskov
	 */
#if 0
	if((addr & 0x3fc) || length & 0x3ff || ((addr > 0x200000) &&
						(addr < 0xff0000)))
		ctrl_data &= ~(CYBER_DMA_Z3);	/* Z2, do 16 bit DMA */
	else
		ctrl_data |= CYBER_DMA_Z3; /* CHIP/Z3, do 32 bit DMA */
#else
	ctrl_data &= ~(CYBER_DMA_Z3);	/* Z2, do 16 bit DMA */
#endif
	dregs->ctrl_reg = ctrl_data;
}

static void dma_init_write(struct NCR_ESP *esp, __u32 addr, int length)
{
	struct cyber_dma_registers *dregs = 
		(struct cyber_dma_registers *) esp->dregs;

	cache_push(addr, length);

	addr |= 1;
	dregs->dma_addr0 = (addr >> 24) & 0xff;
	dregs->dma_addr1 = (addr >> 16) & 0xff;
	dregs->dma_addr2 = (addr >>  8) & 0xff;
	dregs->dma_addr3 = (addr      ) & 0xff;
	ctrl_data |= CYBER_DMA_WRITE;

	/* See comment above */
#if 0
	if((addr & 0x3fc) || length & 0x3ff || ((addr > 0x200000) &&
						(addr < 0xff0000)))
		ctrl_data &= ~(CYBER_DMA_Z3);	/* Z2, do 16 bit DMA */
	else
		ctrl_data |= CYBER_DMA_Z3; /* CHIP/Z3, do 32 bit DMA */
#else
	ctrl_data &= ~(CYBER_DMA_Z3);	/* Z2, do 16 bit DMA */
#endif
	dregs->ctrl_reg = ctrl_data;
}

static void dma_ints_off(struct NCR_ESP *esp)
{
	disable_irq(esp->irq);
}

static void dma_ints_on(struct NCR_ESP *esp)
{
	enable_irq(esp->irq);
}

static int dma_irq_p(struct NCR_ESP *esp)
{
	/* It's important to check the DMA IRQ bit in the correct way! */
	return ((esp_read(esp->eregs->esp_status) & ESP_STAT_INTR) &&
		((((struct cyber_dma_registers *)(esp->dregs))->cond_reg) &
		 CYBER_DMA_HNDL_INTR));
}

static void dma_led_off(struct NCR_ESP *esp)
{
	ctrl_data &= ~CYBER_DMA_LED;
	((struct cyber_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
}

static void dma_led_on(struct NCR_ESP *esp)
{
	ctrl_data |= CYBER_DMA_LED;
	((struct cyber_dma_registers *)(esp->dregs))->ctrl_reg = ctrl_data;
}

static int dma_ports_p(struct NCR_ESP *esp)
{
	return ((amiga_custom.intenar) & IF_PORTS);
}

static void dma_setup(struct NCR_ESP *esp, __u32 addr, int count, int write)
{
	/* On the Sparc, DMA_ST_WRITE means "move data from device to memory"
	 * so when (write) is true, it actually means READ!
	 */
	if(write){
		dma_init_read(esp, addr, count);
	} else {
		dma_init_write(esp, addr, count);
	}
}

#define HOSTS_C

int cyber_esp_release(struct Scsi_Host *instance)
{
#ifdef MODULE
	unsigned long address = (unsigned long)((struct NCR_ESP *)instance->hostdata)->edev;

	esp_deallocate((struct NCR_ESP *)instance->hostdata);
	esp_release();
	release_mem_region(address, sizeof(struct ESP_regs));
	free_irq(IRQ_AMIGA_PORTS, esp_intr);
#endif
	return 1;
}


static struct scsi_host_template driver_template = {
	.proc_name		= "esp-cyberstorm",
	.proc_info		= esp_proc_info,
	.name			= "CyberStorm SCSI",
	.detect			= cyber_esp_detect,
	.slave_alloc		= esp_slave_alloc,
	.slave_destroy		= esp_slave_destroy,
	.release		= cyber_esp_release,
	.queuecommand		= esp_queue,
	.eh_abort_handler	= esp_abort,
	.eh_bus_reset_handler	= esp_reset,
	.can_queue		= 7,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= 1,
	.use_clustering		= ENABLE_CLUSTERING
};


#include "scsi_module.c"

MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud