cumana_2.c 13.4 KB
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520
/*
 *  linux/drivers/acorn/scsi/cumana_2.c
 *
 *  Copyright (C) 1997-2005 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Changelog:
 *   30-08-1997	RMK	0.0.0	Created, READONLY version.
 *   22-01-1998	RMK	0.0.1	Updated to 2.1.80.
 *   15-04-1998	RMK	0.0.1	Only do PIO if FAS216 will allow it.
 *   02-05-1998	RMK	0.0.2	Updated & added DMA support.
 *   27-06-1998	RMK		Changed asm/delay.h to linux/delay.h
 *   18-08-1998	RMK	0.0.3	Fixed synchronous transfer depth.
 *   02-04-2000	RMK	0.0.4	Updated for new error handling code.
 */
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>

#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/io.h>
#include <asm/pgtable.h>

#include "../scsi.h"
#include <scsi/scsi_host.h>
#include "fas216.h"
#include "scsi.h"

#include <scsi/scsicam.h>

#define CUMANASCSI2_STATUS		(0x0000)
#define STATUS_INT			(1 << 0)
#define STATUS_DRQ			(1 << 1)
#define STATUS_LATCHED			(1 << 3)

#define CUMANASCSI2_ALATCH		(0x0014)
#define ALATCH_ENA_INT			(3)
#define ALATCH_DIS_INT			(2)
#define ALATCH_ENA_TERM			(5)
#define ALATCH_DIS_TERM			(4)
#define ALATCH_ENA_BIT32		(11)
#define ALATCH_DIS_BIT32		(10)
#define ALATCH_ENA_DMA			(13)
#define ALATCH_DIS_DMA			(12)
#define ALATCH_DMA_OUT			(15)
#define ALATCH_DMA_IN			(14)

#define CUMANASCSI2_PSEUDODMA		(0x0200)

#define CUMANASCSI2_FAS216_OFFSET	(0x0300)
#define CUMANASCSI2_FAS216_SHIFT	2

/*
 * Version
 */
#define VERSION "1.00 (13/11/2002 2.5.47)"

/*
 * Use term=0,1,0,0,0 to turn terminators on/off
 */
static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };

#define NR_SG	256

struct cumanascsi2_info {
	FAS216_Info		info;
	struct expansion_card	*ec;
	void __iomem		*base;
	unsigned int		terms;		/* Terminator state	*/
	struct scatterlist	sg[NR_SG];	/* Scatter DMA list	*/
};

#define CSTATUS_IRQ	(1 << 0)
#define CSTATUS_DRQ	(1 << 1)

/* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
 * Purpose  : Enable interrupts on Cumana SCSI 2 card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
{
	struct cumanascsi2_info *info = ec->irq_data;
	writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
}

/* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
 * Purpose  : Disable interrupts on Cumana SCSI 2 card
 * Params   : ec    - expansion card structure
 *          : irqnr - interrupt number
 */
static void
cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
{
	struct cumanascsi2_info *info = ec->irq_data;
	writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
}

static const expansioncard_ops_t cumanascsi_2_ops = {
	.irqenable	= cumanascsi_2_irqenable,
	.irqdisable	= cumanascsi_2_irqdisable,
};

/* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
 * Purpose  : Turn the Cumana SCSI 2 terminators on or off
 * Params   : host   - card to turn on/off
 *          : on_off - !0 to turn on, 0 to turn off
 */
static void
cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;

	if (on_off) {
		info->terms = 1;
		writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
	} else {
		info->terms = 0;
		writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
	}
}

/* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
 * Purpose  : handle interrupts from Cumana SCSI 2 card
 * Params   : irq    - interrupt number
 *	      dev_id - user-defined (Scsi_Host structure)
 */
static irqreturn_t
cumanascsi_2_intr(int irq, void *dev_id)
{
	struct cumanascsi2_info *info = dev_id;

	return fas216_intr(&info->info);
}

/* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
 * Purpose  : initialises DMA/PIO
 * Params   : host      - host
 *	      SCpnt     - command
 *	      direction - DMA on to/off of card
 *	      min_type  - minimum DMA support that we must have for this transfer
 * Returns  : type of transfer to be performed
 */
static fasdmatype_t
cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
		       fasdmadir_t direction, fasdmatype_t min_type)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	struct device *dev = scsi_get_device(host);
	int dmach = info->info.scsi.dma;

	writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);

	if (dmach != NO_DMA &&
	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
		int bufs, map_dir, dma_dir, alatch_dir;

		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);

		if (direction == DMA_OUT)
			map_dir = DMA_TO_DEVICE,
			dma_dir = DMA_MODE_WRITE,
			alatch_dir = ALATCH_DMA_OUT;
		else
			map_dir = DMA_FROM_DEVICE,
			dma_dir = DMA_MODE_READ,
			alatch_dir = ALATCH_DMA_IN;

		dma_map_sg(dev, info->sg, bufs, map_dir);

		disable_dma(dmach);
		set_dma_sg(dmach, info->sg, bufs);
		writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
		set_dma_mode(dmach, dma_dir);
		enable_dma(dmach);
		writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
		writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
		return fasdma_real_all;
	}

	/*
	 * If we're not doing DMA,
	 *  we'll do pseudo DMA
	 */
	return fasdma_pio;
}

/*
 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
 * Purpose  : handles pseudo DMA
 * Params   : host      - host
 *	      SCpnt     - command
 *	      direction - DMA on to/off of card
 *	      transfer  - minimum number of bytes we expect to transfer
 */
static void
cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
			fasdmadir_t direction, int transfer)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	unsigned int length;
	unsigned char *addr;

	length = SCp->this_residual;
	addr = SCp->ptr;

	if (direction == DMA_OUT)
#if 0
		while (length > 1) {
			unsigned long word;
			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);

			if (status & STATUS_INT)
				goto end;

			if (!(status & STATUS_DRQ))
				continue;

			word = *addr | *(addr + 1) << 8;
			writew(word, info->base + CUMANASCSI2_PSEUDODMA);
			addr += 2;
			length -= 2;
		}
#else
		printk ("PSEUDO_OUT???\n");
#endif
	else {
		if (transfer && (transfer & 255)) {
			while (length >= 256) {
				unsigned int status = readb(info->base + CUMANASCSI2_STATUS);

				if (status & STATUS_INT)
					return;
	    
				if (!(status & STATUS_DRQ))
					continue;

				readsw(info->base + CUMANASCSI2_PSEUDODMA,
				       addr, 256 >> 1);
				addr += 256;
				length -= 256;
			}
		}

		while (length > 0) {
			unsigned long word;
			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);

			if (status & STATUS_INT)
				return;

			if (!(status & STATUS_DRQ))
				continue;

			word = readw(info->base + CUMANASCSI2_PSEUDODMA);
			*addr++ = word;
			if (--length > 0) {
				*addr++ = word >> 8;
				length --;
			}
		}
	}
}

/* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
 * Purpose  : stops DMA/PIO
 * Params   : host  - host
 *	      SCpnt - command
 */
static void
cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	if (info->info.scsi.dma != NO_DMA) {
		writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
		disable_dma(info->info.scsi.dma);
	}
}

/* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
 * Purpose  : returns a descriptive string about this interface,
 * Params   : host - driver host structure to return info for.
 * Returns  : pointer to a static buffer containing null terminated string.
 */
const char *cumanascsi_2_info(struct Scsi_Host *host)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
	static char string[150];

	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
		VERSION, info->terms ? "n" : "ff");

	return string;
}

/* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 * Purpose  : Set a driver specific function
 * Params   : host   - host to setup
 *          : buffer - buffer containing string describing operation
 *          : length - length of string
 * Returns  : -EINVAL, or 0
 */
static int
cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
{
	int ret = length;

	if (length >= 11 && strncmp(buffer, "CUMANASCSI2", 11) == 0) {
		buffer += 11;
		length -= 11;

		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
			if (buffer[5] == '1')
				cumanascsi_2_terminator_ctl(host, 1);
			else if (buffer[5] == '0')
				cumanascsi_2_terminator_ctl(host, 0);
			else
				ret = -EINVAL;
		} else
			ret = -EINVAL;
	} else
		ret = -EINVAL;

	return ret;
}

static int cumanascsi_2_show_info(struct seq_file *m, struct Scsi_Host *host)
{
	struct cumanascsi2_info *info;
	info = (struct cumanascsi2_info *)host->hostdata;

	seq_printf(m, "Cumana SCSI II driver v%s\n", VERSION);
	fas216_print_host(&info->info, m);
	seq_printf(m, "Term    : o%s\n",
			info->terms ? "n" : "ff");

	fas216_print_stats(&info->info, m);
	fas216_print_devices(&info->info, m);
	return 0;
}

static struct scsi_host_template cumanascsi2_template = {
	.module				= THIS_MODULE,
	.show_info			= cumanascsi_2_show_info,
	.write_info			= cumanascsi_2_set_proc_info,
	.name				= "Cumana SCSI II",
	.info				= cumanascsi_2_info,
	.queuecommand			= fas216_queue_command,
	.eh_host_reset_handler		= fas216_eh_host_reset,
	.eh_bus_reset_handler		= fas216_eh_bus_reset,
	.eh_device_reset_handler	= fas216_eh_device_reset,
	.eh_abort_handler		= fas216_eh_abort,
	.can_queue			= 1,
	.this_id			= 7,
	.sg_tablesize			= SCSI_MAX_SG_CHAIN_SEGMENTS,
	.dma_boundary			= IOMD_DMA_BOUNDARY,
	.use_clustering			= DISABLE_CLUSTERING,
	.proc_name			= "cumanascsi2",
};

static int cumanascsi2_probe(struct expansion_card *ec,
			     const struct ecard_id *id)
{
	struct Scsi_Host *host;
	struct cumanascsi2_info *info;
	void __iomem *base;
	int ret;

	ret = ecard_request_resources(ec);
	if (ret)
		goto out;

	base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
	if (!base) {
		ret = -ENOMEM;
		goto out_region;
	}

	host = scsi_host_alloc(&cumanascsi2_template,
			       sizeof(struct cumanascsi2_info));
	if (!host) {
		ret = -ENOMEM;
		goto out_region;
	}

	ecard_set_drvdata(ec, host);

	info = (struct cumanascsi2_info *)host->hostdata;
	info->ec	= ec;
	info->base	= base;

	cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);

	info->info.scsi.io_base		= base + CUMANASCSI2_FAS216_OFFSET;
	info->info.scsi.io_shift	= CUMANASCSI2_FAS216_SHIFT;
	info->info.scsi.irq		= ec->irq;
	info->info.scsi.dma		= ec->dma;
	info->info.ifcfg.clockrate	= 40; /* MHz */
	info->info.ifcfg.select_timeout	= 255;
	info->info.ifcfg.asyncperiod	= 200; /* ns */
	info->info.ifcfg.sync_max_depth	= 7;
	info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
	info->info.ifcfg.disconnect_ok	= 1;
	info->info.ifcfg.wide_max_size	= 0;
	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
	info->info.dma.setup		= cumanascsi_2_dma_setup;
	info->info.dma.pseudo		= cumanascsi_2_dma_pseudo;
	info->info.dma.stop		= cumanascsi_2_dma_stop;

	ec->irqaddr	= info->base + CUMANASCSI2_STATUS;
	ec->irqmask	= STATUS_INT;

	ecard_setirq(ec, &cumanascsi_2_ops, info);

	ret = fas216_init(host);
	if (ret)
		goto out_free;

	ret = request_irq(ec->irq, cumanascsi_2_intr,
			  0, "cumanascsi2", info);
	if (ret) {
		printk("scsi%d: IRQ%d not free: %d\n",
		       host->host_no, ec->irq, ret);
		goto out_release;
	}

	if (info->info.scsi.dma != NO_DMA) {
		if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
			printk("scsi%d: DMA%d not free, using PIO\n",
			       host->host_no, info->info.scsi.dma);
			info->info.scsi.dma = NO_DMA;
		} else {
			set_dma_speed(info->info.scsi.dma, 180);
			info->info.ifcfg.capabilities |= FASCAP_DMA;
		}
	}

	ret = fas216_add(host, &ec->dev);
	if (ret == 0)
		goto out;

	if (info->info.scsi.dma != NO_DMA)
		free_dma(info->info.scsi.dma);
	free_irq(ec->irq, host);

 out_release:
	fas216_release(host);

 out_free:
	scsi_host_put(host);

 out_region:
	ecard_release_resources(ec);

 out:
	return ret;
}

static void cumanascsi2_remove(struct expansion_card *ec)
{
	struct Scsi_Host *host = ecard_get_drvdata(ec);
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;

	ecard_set_drvdata(ec, NULL);
	fas216_remove(host);

	if (info->info.scsi.dma != NO_DMA)
		free_dma(info->info.scsi.dma);
	free_irq(ec->irq, info);

	fas216_release(host);
	scsi_host_put(host);
	ecard_release_resources(ec);
}

static const struct ecard_id cumanascsi2_cids[] = {
	{ MANU_CUMANA, PROD_CUMANA_SCSI_2 },
	{ 0xffff, 0xffff },
};

static struct ecard_driver cumanascsi2_driver = {
	.probe		= cumanascsi2_probe,
	.remove		= cumanascsi2_remove,
	.id_table	= cumanascsi2_cids,
	.drv = {
		.name		= "cumanascsi2",
	},
};

static int __init cumanascsi2_init(void)
{
	return ecard_register_driver(&cumanascsi2_driver);
}

static void __exit cumanascsi2_exit(void)
{
	ecard_remove_driver(&cumanascsi2_driver);
}

module_init(cumanascsi2_init);
module_exit(cumanascsi2_exit);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
module_param_array(term, int, NULL, 0);
MODULE_PARM_DESC(term, "SCSI bus termination");
MODULE_LICENSE("GPL");