1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *  sym53c500_cs.c	Bob Tracy (rct@frus.com)
4 *
5 *  A rewrite of the pcmcia-cs add-on driver for newer (circa 1997)
6 *  New Media Bus Toaster PCMCIA SCSI cards using the Symbios Logic
7 *  53c500 controller: intended for use with 2.6 and later kernels.
8 *  The pcmcia-cs add-on version of this driver is not supported
9 *  beyond 2.4.  It consisted of three files with history/copyright
10 *  information as follows:
11 *
12 *  SYM53C500.h
13 *	Bob Tracy (rct@frus.com)
14 *	Original by Tom Corner (tcorner@via.at).
15 *	Adapted from NCR53c406a.h which is Copyrighted (C) 1994
16 *	Normunds Saumanis (normunds@rx.tech.swh.lv)
17 *
18 *  SYM53C500.c
19 *	Bob Tracy (rct@frus.com)
20 *	Original driver by Tom Corner (tcorner@via.at) was adapted
21 *	from NCR53c406a.c which is Copyrighted (C) 1994, 1995, 1996
22 *	Normunds Saumanis (normunds@fi.ibm.com)
23 *
24 *  sym53c500.c
25 *	Bob Tracy (rct@frus.com)
26 *	Original by Tom Corner (tcorner@via.at) was adapted from a
27 *	driver for the Qlogic SCSI card written by
28 *	David Hinds (dhinds@allegro.stanford.edu).
29 */
30 
31 #define SYM53C500_DEBUG 0
32 #define VERBOSE_SYM53C500_DEBUG 0
33 
34 /*
35 *  Set this to 0 if you encounter kernel lockups while transferring
36 *  data in PIO mode.  Note this can be changed via "sysfs".
37 */
38 #define USE_FAST_PIO 1
39 
40 /* =============== End of user configurable parameters ============== */
41 
42 #include <linux/module.h>
43 #include <linux/moduleparam.h>
44 #include <linux/errno.h>
45 #include <linux/init.h>
46 #include <linux/interrupt.h>
47 #include <linux/kernel.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/ioport.h>
51 #include <linux/blkdev.h>
52 #include <linux/spinlock.h>
53 #include <linux/bitops.h>
54 
55 #include <asm/io.h>
56 #include <asm/dma.h>
57 #include <asm/irq.h>
58 
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_device.h>
62 #include <scsi/scsi.h>
63 #include <scsi/scsi_host.h>
64 
65 #include <pcmcia/cistpl.h>
66 #include <pcmcia/ds.h>
67 #include <pcmcia/ciscode.h>
68 
69 
70 /* ================================================================== */
71 
72 #define SYNC_MODE 0 		/* Synchronous transfer mode */
73 
74 /* Default configuration */
75 #define C1_IMG   0x07		/* ID=7 */
76 #define C2_IMG   0x48		/* FE SCSI2 */
77 #define C3_IMG   0x20		/* CDB */
78 #define C4_IMG   0x04		/* ANE */
79 #define C5_IMG   0xa4		/* ? changed from b6= AA PI SIE POL */
80 #define C7_IMG   0x80		/* added for SYM53C500 t. corner */
81 
82 /* Hardware Registers: offsets from io_port (base) */
83 
84 /* Control Register Set 0 */
85 #define TC_LSB		0x00		/* transfer counter lsb */
86 #define TC_MSB		0x01		/* transfer counter msb */
87 #define SCSI_FIFO	0x02		/* scsi fifo register */
88 #define CMD_REG		0x03		/* command register */
89 #define STAT_REG	0x04		/* status register */
90 #define DEST_ID		0x04		/* selection/reselection bus id */
91 #define INT_REG		0x05		/* interrupt status register */
92 #define SRTIMOUT	0x05		/* select/reselect timeout reg */
93 #define SEQ_REG		0x06		/* sequence step register */
94 #define SYNCPRD		0x06		/* synchronous transfer period */
95 #define FIFO_FLAGS	0x07		/* indicates # of bytes in fifo */
96 #define SYNCOFF		0x07		/* synchronous offset register */
97 #define CONFIG1		0x08		/* configuration register */
98 #define CLKCONV		0x09		/* clock conversion register */
99 /* #define TESTREG	0x0A */		/* test mode register */
100 #define CONFIG2		0x0B		/* configuration 2 register */
101 #define CONFIG3		0x0C		/* configuration 3 register */
102 #define CONFIG4		0x0D		/* configuration 4 register */
103 #define TC_HIGH		0x0E		/* transfer counter high */
104 /* #define FIFO_BOTTOM	0x0F */		/* reserve FIFO byte register */
105 
106 /* Control Register Set 1 */
107 /* #define JUMPER_SENSE	0x00 */		/* jumper sense port reg (r/w) */
108 /* #define SRAM_PTR	0x01 */		/* SRAM address pointer reg (r/w) */
109 /* #define SRAM_DATA	0x02 */		/* SRAM data register (r/w) */
110 #define PIO_FIFO	0x04		/* PIO FIFO registers (r/w) */
111 /* #define PIO_FIFO1	0x05 */		/*  */
112 /* #define PIO_FIFO2	0x06 */		/*  */
113 /* #define PIO_FIFO3	0x07 */		/*  */
114 #define PIO_STATUS	0x08		/* PIO status (r/w) */
115 /* #define ATA_CMD	0x09 */		/* ATA command/status reg (r/w) */
116 /* #define ATA_ERR	0x0A */		/* ATA features/error reg (r/w) */
117 #define PIO_FLAG	0x0B		/* PIO flag interrupt enable (r/w) */
118 #define CONFIG5		0x09		/* configuration 5 register */
119 /* #define SIGNATURE	0x0E */		/* signature register (r) */
120 /* #define CONFIG6	0x0F */		/* configuration 6 register (r) */
121 #define CONFIG7		0x0d
122 
123 /* select register set 0 */
124 #define REG0(x)		(outb(C4_IMG, (x) + CONFIG4))
125 /* select register set 1 */
126 #define REG1(x)		outb(C7_IMG, (x) + CONFIG7); outb(C5_IMG, (x) + CONFIG5)
127 
128 #if SYM53C500_DEBUG
129 #define DEB(x) x
130 #else
131 #define DEB(x)
132 #endif
133 
134 #if VERBOSE_SYM53C500_DEBUG
135 #define VDEB(x) x
136 #else
137 #define VDEB(x)
138 #endif
139 
140 #define LOAD_DMA_COUNT(x, count) \
141   outb(count & 0xff, (x) + TC_LSB); \
142   outb((count >> 8) & 0xff, (x) + TC_MSB); \
143   outb((count >> 16) & 0xff, (x) + TC_HIGH);
144 
145 /* Chip commands */
146 #define DMA_OP               0x80
147 
148 #define SCSI_NOP             0x00
149 #define FLUSH_FIFO           0x01
150 #define CHIP_RESET           0x02
151 #define SCSI_RESET           0x03
152 #define RESELECT             0x40
153 #define SELECT_NO_ATN        0x41
154 #define SELECT_ATN           0x42
155 #define SELECT_ATN_STOP      0x43
156 #define ENABLE_SEL           0x44
157 #define DISABLE_SEL          0x45
158 #define SELECT_ATN3          0x46
159 #define RESELECT3            0x47
160 #define TRANSFER_INFO        0x10
161 #define INIT_CMD_COMPLETE    0x11
162 #define MSG_ACCEPT           0x12
163 #define TRANSFER_PAD         0x18
164 #define SET_ATN              0x1a
165 #define RESET_ATN            0x1b
166 #define SEND_MSG             0x20
167 #define SEND_STATUS          0x21
168 #define SEND_DATA            0x22
169 #define DISCONN_SEQ          0x23
170 #define TERMINATE_SEQ        0x24
171 #define TARG_CMD_COMPLETE    0x25
172 #define DISCONN              0x27
173 #define RECV_MSG             0x28
174 #define RECV_CMD             0x29
175 #define RECV_DATA            0x2a
176 #define RECV_CMD_SEQ         0x2b
177 #define TARGET_ABORT_DMA     0x04
178 
179 /* ================================================================== */
180 
181 struct scsi_info_t {
182 	struct pcmcia_device	*p_dev;
183 	struct Scsi_Host *host;
184 	unsigned short manf_id;
185 };
186 
187 /*
188 *  Repository for per-instance host data.
189 */
190 struct sym53c500_data {
191 	struct scsi_cmnd *current_SC;
192 	int fast_pio;
193 };
194 
195 struct sym53c500_cmd_priv {
196 	int status;
197 	int message;
198 	int phase;
199 };
200 
201 enum Phase {
202     idle,
203     data_out,
204     data_in,
205     command_ph,
206     status_ph,
207     message_out,
208     message_in
209 };
210 
211 /* ================================================================== */
212 
213 static void
214 chip_init(int io_port)
215 {
216 	REG1(io_port);
217 	outb(0x01, io_port + PIO_STATUS);
218 	outb(0x00, io_port + PIO_FLAG);
219 
220 	outb(C4_IMG, io_port + CONFIG4);	/* REG0(io_port); */
221 	outb(C3_IMG, io_port + CONFIG3);
222 	outb(C2_IMG, io_port + CONFIG2);
223 	outb(C1_IMG, io_port + CONFIG1);
224 
225 	outb(0x05, io_port + CLKCONV);	/* clock conversion factor */
226 	outb(0x9C, io_port + SRTIMOUT);	/* Selection timeout */
227 	outb(0x05, io_port + SYNCPRD);	/* Synchronous transfer period */
228 	outb(SYNC_MODE, io_port + SYNCOFF);	/* synchronous mode */
229 }
230 
231 static void
232 SYM53C500_int_host_reset(int io_port)
233 {
234 	outb(C4_IMG, io_port + CONFIG4);	/* REG0(io_port); */
235 	outb(CHIP_RESET, io_port + CMD_REG);
236 	outb(SCSI_NOP, io_port + CMD_REG);	/* required after reset */
237 	outb(SCSI_RESET, io_port + CMD_REG);
238 	chip_init(io_port);
239 }
240 
241 static __inline__ int
242 SYM53C500_pio_read(int fast_pio, int base, unsigned char *request, unsigned int reqlen)
243 {
244 	int i;
245 	int len;	/* current scsi fifo size */
246 
247 	REG1(base);
248 	while (reqlen) {
249 		i = inb(base + PIO_STATUS);
250 		/* VDEB(printk("pio_status=%x\n", i)); */
251 		if (i & 0x80)
252 			return 0;
253 
254 		switch (i & 0x1e) {
255 		default:
256 		case 0x10:	/* fifo empty */
257 			len = 0;
258 			break;
259 		case 0x0:
260 			len = 1;
261 			break;
262 		case 0x8:	/* fifo 1/3 full */
263 			len = 42;
264 			break;
265 		case 0xc:	/* fifo 2/3 full */
266 			len = 84;
267 			break;
268 		case 0xe:	/* fifo full */
269 			len = 128;
270 			break;
271 		}
272 
273 		if ((i & 0x40) && len == 0) { /* fifo empty and interrupt occurred */
274 			return 0;
275 		}
276 
277 		if (len) {
278 			if (len > reqlen)
279 				len = reqlen;
280 
281 			if (fast_pio && len > 3) {
282 				insl(base + PIO_FIFO, request, len >> 2);
283 				request += len & 0xfc;
284 				reqlen -= len & 0xfc;
285 			} else {
286 				while (len--) {
287 					*request++ = inb(base + PIO_FIFO);
288 					reqlen--;
289 				}
290 			}
291 		}
292 	}
293 	return 0;
294 }
295 
296 static __inline__ int
297 SYM53C500_pio_write(int fast_pio, int base, unsigned char *request, unsigned int reqlen)
298 {
299 	int i = 0;
300 	int len;	/* current scsi fifo size */
301 
302 	REG1(base);
303 	while (reqlen && !(i & 0x40)) {
304 		i = inb(base + PIO_STATUS);
305 		/* VDEB(printk("pio_status=%x\n", i)); */
306 		if (i & 0x80)	/* error */
307 			return 0;
308 
309 		switch (i & 0x1e) {
310 		case 0x10:
311 			len = 128;
312 			break;
313 		case 0x0:
314 			len = 84;
315 			break;
316 		case 0x8:
317 			len = 42;
318 			break;
319 		case 0xc:
320 			len = 1;
321 			break;
322 		default:
323 		case 0xe:
324 			len = 0;
325 			break;
326 		}
327 
328 		if (len) {
329 			if (len > reqlen)
330 				len = reqlen;
331 
332 			if (fast_pio && len > 3) {
333 				outsl(base + PIO_FIFO, request, len >> 2);
334 				request += len & 0xfc;
335 				reqlen -= len & 0xfc;
336 			} else {
337 				while (len--) {
338 					outb(*request++, base + PIO_FIFO);
339 					reqlen--;
340 				}
341 			}
342 		}
343 	}
344 	return 0;
345 }
346 
347 static irqreturn_t
348 SYM53C500_intr(int irq, void *dev_id)
349 {
350 	unsigned long flags;
351 	struct Scsi_Host *dev = dev_id;
352 	DEB(unsigned char fifo_size;)
353 	DEB(unsigned char seq_reg;)
354 	unsigned char status, int_reg;
355 	unsigned char pio_status;
356 	int port_base = dev->io_port;
357 	struct sym53c500_data *data =
358 	    (struct sym53c500_data *)dev->hostdata;
359 	struct scsi_cmnd *curSC = data->current_SC;
360 	struct sym53c500_cmd_priv *scp = scsi_cmd_priv(curSC);
361 	int fast_pio = data->fast_pio;
362 
363 	spin_lock_irqsave(dev->host_lock, flags);
364 
365 	VDEB(printk("SYM53C500_intr called\n"));
366 
367 	REG1(port_base);
368 	pio_status = inb(port_base + PIO_STATUS);
369 	REG0(port_base);
370 	status = inb(port_base + STAT_REG);
371 	DEB(seq_reg = inb(port_base + SEQ_REG));
372 	int_reg = inb(port_base + INT_REG);
373 	DEB(fifo_size = inb(port_base + FIFO_FLAGS) & 0x1f);
374 
375 #if SYM53C500_DEBUG
376 	printk("status=%02x, seq_reg=%02x, int_reg=%02x, fifo_size=%02x",
377 	    status, seq_reg, int_reg, fifo_size);
378 	printk(", pio=%02x\n", pio_status);
379 #endif /* SYM53C500_DEBUG */
380 
381 	if (int_reg & 0x80) {	/* SCSI reset intr */
382 		DEB(printk("SYM53C500: reset intr received\n"));
383 		curSC->result = DID_RESET << 16;
384 		goto idle_out;
385 	}
386 
387 	if (pio_status & 0x80) {
388 		printk("SYM53C500: Warning: PIO error!\n");
389 		curSC->result = DID_ERROR << 16;
390 		goto idle_out;
391 	}
392 
393 	if (status & 0x20) {		/* Parity error */
394 		printk("SYM53C500: Warning: parity error!\n");
395 		curSC->result = DID_PARITY << 16;
396 		goto idle_out;
397 	}
398 
399 	if (status & 0x40) {		/* Gross error */
400 		printk("SYM53C500: Warning: gross error!\n");
401 		curSC->result = DID_ERROR << 16;
402 		goto idle_out;
403 	}
404 
405 	if (int_reg & 0x20) {		/* Disconnect */
406 		DEB(printk("SYM53C500: disconnect intr received\n"));
407 		if (scp->phase != message_in) {	/* Unexpected disconnect */
408 			curSC->result = DID_NO_CONNECT << 16;
409 		} else {	/* Command complete, return status and message */
410 			curSC->result = (scp->status & 0xff) |
411 				((scp->message & 0xff) << 8) | (DID_OK << 16);
412 		}
413 		goto idle_out;
414 	}
415 
416 	switch (status & 0x07) {	/* scsi phase */
417 	case 0x00:			/* DATA-OUT */
418 		if (int_reg & 0x10) {	/* Target requesting info transfer */
419 			struct scatterlist *sg;
420 			int i;
421 
422 			scp->phase = data_out;
423 			VDEB(printk("SYM53C500: Data-Out phase\n"));
424 			outb(FLUSH_FIFO, port_base + CMD_REG);
425 			LOAD_DMA_COUNT(port_base, scsi_bufflen(curSC));	/* Max transfer size */
426 			outb(TRANSFER_INFO | DMA_OP, port_base + CMD_REG);
427 
428 			scsi_for_each_sg(curSC, sg, scsi_sg_count(curSC), i) {
429 				SYM53C500_pio_write(fast_pio, port_base,
430 				    sg_virt(sg), sg->length);
431 			}
432 			REG0(port_base);
433 		}
434 		break;
435 
436 	case 0x01:		/* DATA-IN */
437 		if (int_reg & 0x10) {	/* Target requesting info transfer */
438 			struct scatterlist *sg;
439 			int i;
440 
441 			scp->phase = data_in;
442 			VDEB(printk("SYM53C500: Data-In phase\n"));
443 			outb(FLUSH_FIFO, port_base + CMD_REG);
444 			LOAD_DMA_COUNT(port_base, scsi_bufflen(curSC));	/* Max transfer size */
445 			outb(TRANSFER_INFO | DMA_OP, port_base + CMD_REG);
446 
447 			scsi_for_each_sg(curSC, sg, scsi_sg_count(curSC), i) {
448 				SYM53C500_pio_read(fast_pio, port_base,
449 					sg_virt(sg), sg->length);
450 			}
451 			REG0(port_base);
452 		}
453 		break;
454 
455 	case 0x02:		/* COMMAND */
456 		scp->phase = command_ph;
457 		printk("SYM53C500: Warning: Unknown interrupt occurred in command phase!\n");
458 		break;
459 
460 	case 0x03:		/* STATUS */
461 		scp->phase = status_ph;
462 		VDEB(printk("SYM53C500: Status phase\n"));
463 		outb(FLUSH_FIFO, port_base + CMD_REG);
464 		outb(INIT_CMD_COMPLETE, port_base + CMD_REG);
465 		break;
466 
467 	case 0x04:		/* Reserved */
468 	case 0x05:		/* Reserved */
469 		printk("SYM53C500: WARNING: Reserved phase!!!\n");
470 		break;
471 
472 	case 0x06:		/* MESSAGE-OUT */
473 		DEB(printk("SYM53C500: Message-Out phase\n"));
474 		scp->phase = message_out;
475 		outb(SET_ATN, port_base + CMD_REG);	/* Reject the message */
476 		outb(MSG_ACCEPT, port_base + CMD_REG);
477 		break;
478 
479 	case 0x07:		/* MESSAGE-IN */
480 		VDEB(printk("SYM53C500: Message-In phase\n"));
481 		scp->phase = message_in;
482 
483 		scp->status = inb(port_base + SCSI_FIFO);
484 		scp->message = inb(port_base + SCSI_FIFO);
485 
486 		VDEB(printk("SCSI FIFO size=%d\n", inb(port_base + FIFO_FLAGS) & 0x1f));
487 		DEB(printk("Status = %02x  Message = %02x\n", scp->status, scp->message));
488 
489 		if (scp->message == SAVE_POINTERS || scp->message == DISCONNECT) {
490 			outb(SET_ATN, port_base + CMD_REG);	/* Reject message */
491 			DEB(printk("Discarding SAVE_POINTERS message\n"));
492 		}
493 		outb(MSG_ACCEPT, port_base + CMD_REG);
494 		break;
495 	}
496 out:
497 	spin_unlock_irqrestore(dev->host_lock, flags);
498 	return IRQ_HANDLED;
499 
500 idle_out:
501 	scp->phase = idle;
502 	scsi_done(curSC);
503 	goto out;
504 }
505 
506 static void
507 SYM53C500_release(struct pcmcia_device *link)
508 {
509 	struct scsi_info_t *info = link->priv;
510 	struct Scsi_Host *shost = info->host;
511 
512 	dev_dbg(&link->dev, "SYM53C500_release\n");
513 
514 	/*
515 	*  Do this before releasing/freeing resources.
516 	*/
517 	scsi_remove_host(shost);
518 
519 	/*
520 	*  Interrupts getting hosed on card removal.  Try
521 	*  the following code, mostly from qlogicfas.c.
522 	*/
523 	if (shost->irq)
524 		free_irq(shost->irq, shost);
525 	if (shost->io_port && shost->n_io_port)
526 		release_region(shost->io_port, shost->n_io_port);
527 
528 	pcmcia_disable_device(link);
529 
530 	scsi_host_put(shost);
531 } /* SYM53C500_release */
532 
533 static const char*
534 SYM53C500_info(struct Scsi_Host *SChost)
535 {
536 	static char info_msg[256];
537 	struct sym53c500_data *data =
538 	    (struct sym53c500_data *)SChost->hostdata;
539 
540 	DEB(printk("SYM53C500_info called\n"));
541 	(void)snprintf(info_msg, sizeof(info_msg),
542 	    "SYM53C500 at 0x%lx, IRQ %d, %s PIO mode.",
543 	    SChost->io_port, SChost->irq, data->fast_pio ? "fast" : "slow");
544 	return (info_msg);
545 }
546 
547 static int SYM53C500_queue_lck(struct scsi_cmnd *SCpnt)
548 {
549 	struct sym53c500_cmd_priv *scp = scsi_cmd_priv(SCpnt);
550 	int i;
551 	int port_base = SCpnt->device->host->io_port;
552 	struct sym53c500_data *data =
553 	    (struct sym53c500_data *)SCpnt->device->host->hostdata;
554 
555 	VDEB(printk("SYM53C500_queue called\n"));
556 
557 	DEB(printk("cmd=%02x, cmd_len=%02x, target=%02x, lun=%02x, bufflen=%d\n",
558 	    SCpnt->cmnd[0], SCpnt->cmd_len, SCpnt->device->id,
559 		   (u8)SCpnt->device->lun,  scsi_bufflen(SCpnt)));
560 
561 	VDEB(for (i = 0; i < SCpnt->cmd_len; i++)
562 	    printk("cmd[%d]=%02x  ", i, SCpnt->cmnd[i]));
563 	VDEB(printk("\n"));
564 
565 	data->current_SC = SCpnt;
566 	scp->phase = command_ph;
567 	scp->status = 0;
568 	scp->message = 0;
569 
570 	/* We are locked here already by the mid layer */
571 	REG0(port_base);
572 	outb(scmd_id(SCpnt), port_base + DEST_ID);	/* set destination */
573 	outb(FLUSH_FIFO, port_base + CMD_REG);	/* reset the fifos */
574 
575 	for (i = 0; i < SCpnt->cmd_len; i++) {
576 		outb(SCpnt->cmnd[i], port_base + SCSI_FIFO);
577 	}
578 	outb(SELECT_NO_ATN, port_base + CMD_REG);
579 
580 	return 0;
581 }
582 
583 static DEF_SCSI_QCMD(SYM53C500_queue)
584 
585 static int
586 SYM53C500_host_reset(struct scsi_cmnd *SCpnt)
587 {
588 	int port_base = SCpnt->device->host->io_port;
589 
590 	DEB(printk("SYM53C500_host_reset called\n"));
591 	spin_lock_irq(SCpnt->device->host->host_lock);
592 	SYM53C500_int_host_reset(port_base);
593 	spin_unlock_irq(SCpnt->device->host->host_lock);
594 
595 	return SUCCESS;
596 }
597 
598 static int
599 SYM53C500_biosparm(struct scsi_device *disk,
600     struct block_device *dev,
601     sector_t capacity, int *info_array)
602 {
603 	int size;
604 
605 	DEB(printk("SYM53C500_biosparm called\n"));
606 
607 	size = capacity;
608 	info_array[0] = 64;		/* heads */
609 	info_array[1] = 32;		/* sectors */
610 	info_array[2] = size >> 11;	/* cylinders */
611 	if (info_array[2] > 1024) {	/* big disk */
612 		info_array[0] = 255;
613 		info_array[1] = 63;
614 		info_array[2] = size / (255 * 63);
615 	}
616 	return 0;
617 }
618 
619 static ssize_t
620 SYM53C500_show_pio(struct device *dev, struct device_attribute *attr,
621 		   char *buf)
622 {
623 	struct Scsi_Host *SHp = class_to_shost(dev);
624 	struct sym53c500_data *data =
625 	    (struct sym53c500_data *)SHp->hostdata;
626 
627 	return snprintf(buf, 4, "%d\n", data->fast_pio);
628 }
629 
630 static ssize_t
631 SYM53C500_store_pio(struct device *dev, struct device_attribute *attr,
632 		    const char *buf, size_t count)
633 {
634 	int pio;
635 	struct Scsi_Host *SHp = class_to_shost(dev);
636 	struct sym53c500_data *data =
637 	    (struct sym53c500_data *)SHp->hostdata;
638 
639 	pio = simple_strtoul(buf, NULL, 0);
640 	if (pio == 0 || pio == 1) {
641 		data->fast_pio = pio;
642 		return count;
643 	}
644 	else
645 		return -EINVAL;
646 }
647 
648 /*
649 *  SCSI HBA device attributes we want to
650 *  make available via sysfs.
651 */
652 static struct device_attribute SYM53C500_pio_attr = {
653 	.attr = {
654 		.name = "fast_pio",
655 		.mode = (S_IRUGO | S_IWUSR),
656 	},
657 	.show = SYM53C500_show_pio,
658 	.store = SYM53C500_store_pio,
659 };
660 
661 static struct attribute *SYM53C500_shost_attrs[] = {
662 	&SYM53C500_pio_attr.attr,
663 	NULL,
664 };
665 
666 ATTRIBUTE_GROUPS(SYM53C500_shost);
667 
668 /*
669 *  scsi_host_template initializer
670 */
671 static const struct scsi_host_template sym53c500_driver_template = {
672      .module			= THIS_MODULE,
673      .name			= "SYM53C500",
674      .info			= SYM53C500_info,
675      .queuecommand		= SYM53C500_queue,
676      .eh_host_reset_handler	= SYM53C500_host_reset,
677      .bios_param		= SYM53C500_biosparm,
678      .proc_name			= "SYM53C500",
679      .can_queue			= 1,
680      .this_id			= 7,
681      .sg_tablesize		= 32,
682      .shost_groups		= SYM53C500_shost_groups,
683      .cmd_size			= sizeof(struct sym53c500_cmd_priv),
684 };
685 
686 static int SYM53C500_config_check(struct pcmcia_device *p_dev, void *priv_data)
687 {
688 	p_dev->io_lines = 10;
689 	p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
690 	p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_AUTO;
691 
692 	if (p_dev->resource[0]->start == 0)
693 		return -ENODEV;
694 
695 	return pcmcia_request_io(p_dev);
696 }
697 
698 static int
699 SYM53C500_config(struct pcmcia_device *link)
700 {
701 	struct scsi_info_t *info = link->priv;
702 	int ret;
703 	int irq_level, port_base;
704 	struct Scsi_Host *host;
705 	const struct scsi_host_template *tpnt = &sym53c500_driver_template;
706 	struct sym53c500_data *data;
707 
708 	dev_dbg(&link->dev, "SYM53C500_config\n");
709 
710 	info->manf_id = link->manf_id;
711 
712 	ret = pcmcia_loop_config(link, SYM53C500_config_check, NULL);
713 	if (ret)
714 		goto failed;
715 
716 	if (!link->irq)
717 		goto failed;
718 
719 	ret = pcmcia_enable_device(link);
720 	if (ret)
721 		goto failed;
722 
723 	/*
724 	*  That's the trouble with copying liberally from another driver.
725 	*  Some things probably aren't relevant, and I suspect this entire
726 	*  section dealing with manufacturer IDs can be scrapped.	--rct
727 	*/
728 	if ((info->manf_id == MANFID_MACNICA) ||
729 	    (info->manf_id == MANFID_PIONEER) ||
730 	    (info->manf_id == 0x0098)) {
731 		/* set ATAcmd */
732 		outb(0xb4, link->resource[0]->start + 0xd);
733 		outb(0x24, link->resource[0]->start + 0x9);
734 		outb(0x04, link->resource[0]->start + 0xd);
735 	}
736 
737 	/*
738 	*  irq_level == 0 implies tpnt->can_queue == 0, which
739 	*  is not supported in 2.6.  Thus, only irq_level > 0
740 	*  will be allowed.
741 	*
742 	*  Possible port_base values are as follows:
743 	*
744 	*	0x130, 0x230, 0x280, 0x290,
745 	*	0x320, 0x330, 0x340, 0x350
746 	*/
747 	port_base = link->resource[0]->start;
748 	irq_level = link->irq;
749 
750 	DEB(printk("SYM53C500: port_base=0x%x, irq=%d, fast_pio=%d\n",
751 	    port_base, irq_level, USE_FAST_PIO);)
752 
753 	chip_init(port_base);
754 
755 	host = scsi_host_alloc(tpnt, sizeof(struct sym53c500_data));
756 	if (!host) {
757 		printk("SYM53C500: Unable to register host, giving up.\n");
758 		goto err_release;
759 	}
760 
761 	data = (struct sym53c500_data *)host->hostdata;
762 
763 	if (irq_level > 0) {
764 		if (request_irq(irq_level, SYM53C500_intr, IRQF_SHARED, "SYM53C500", host)) {
765 			printk("SYM53C500: unable to allocate IRQ %d\n", irq_level);
766 			goto err_free_scsi;
767 		}
768 		DEB(printk("SYM53C500: allocated IRQ %d\n", irq_level));
769 	} else if (irq_level == 0) {
770 		DEB(printk("SYM53C500: No interrupts detected\n"));
771 		goto err_free_scsi;
772 	} else {
773 		DEB(printk("SYM53C500: Shouldn't get here!\n"));
774 		goto err_free_scsi;
775 	}
776 
777 	host->unique_id = port_base;
778 	host->irq = irq_level;
779 	host->io_port = port_base;
780 	host->n_io_port = 0x10;
781 	host->dma_channel = -1;
782 
783 	/*
784 	*  Note fast_pio is set to USE_FAST_PIO by
785 	*  default, but can be changed via "sysfs".
786 	*/
787 	data->fast_pio = USE_FAST_PIO;
788 
789 	info->host = host;
790 
791 	if (scsi_add_host(host, NULL))
792 		goto err_free_irq;
793 
794 	scsi_scan_host(host);
795 
796 	return 0;
797 
798 err_free_irq:
799 	free_irq(irq_level, host);
800 err_free_scsi:
801 	scsi_host_put(host);
802 err_release:
803 	release_region(port_base, 0x10);
804 	printk(KERN_INFO "sym53c500_cs: no SCSI devices found\n");
805 	return -ENODEV;
806 
807 failed:
808 	SYM53C500_release(link);
809 	return -ENODEV;
810 } /* SYM53C500_config */
811 
812 static int sym53c500_resume(struct pcmcia_device *link)
813 {
814 	struct scsi_info_t *info = link->priv;
815 
816 	/* See earlier comment about manufacturer IDs. */
817 	if ((info->manf_id == MANFID_MACNICA) ||
818 	    (info->manf_id == MANFID_PIONEER) ||
819 	    (info->manf_id == 0x0098)) {
820 		outb(0x80, link->resource[0]->start + 0xd);
821 		outb(0x24, link->resource[0]->start + 0x9);
822 		outb(0x04, link->resource[0]->start + 0xd);
823 	}
824 	/*
825 	 *  If things don't work after a "resume",
826 	 *  this is a good place to start looking.
827 	 */
828 	SYM53C500_int_host_reset(link->resource[0]->start);
829 
830 	return 0;
831 }
832 
833 static void
834 SYM53C500_detach(struct pcmcia_device *link)
835 {
836 	dev_dbg(&link->dev, "SYM53C500_detach\n");
837 
838 	SYM53C500_release(link);
839 
840 	kfree(link->priv);
841 	link->priv = NULL;
842 } /* SYM53C500_detach */
843 
844 static int
845 SYM53C500_probe(struct pcmcia_device *link)
846 {
847 	struct scsi_info_t *info;
848 
849 	dev_dbg(&link->dev, "SYM53C500_attach()\n");
850 
851 	/* Create new SCSI device */
852 	info = kzalloc(sizeof(*info), GFP_KERNEL);
853 	if (!info)
854 		return -ENOMEM;
855 	info->p_dev = link;
856 	link->priv = info;
857 	link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
858 
859 	return SYM53C500_config(link);
860 } /* SYM53C500_attach */
861 
862 MODULE_AUTHOR("Bob Tracy <rct@frus.com>");
863 MODULE_DESCRIPTION("SYM53C500 PCMCIA SCSI driver");
864 MODULE_LICENSE("GPL");
865 
866 static const struct pcmcia_device_id sym53c500_ids[] = {
867 	PCMCIA_DEVICE_PROD_ID12("BASICS by New Media Corporation", "SCSI Sym53C500", 0x23c78a9d, 0x0099e7f7),
868 	PCMCIA_DEVICE_PROD_ID12("New Media Corporation", "SCSI Bus Toaster Sym53C500", 0x085a850b, 0x45432eb8),
869 	PCMCIA_DEVICE_PROD_ID2("SCSI9000", 0x21648f44),
870 	PCMCIA_DEVICE_NULL,
871 };
872 MODULE_DEVICE_TABLE(pcmcia, sym53c500_ids);
873 
874 static struct pcmcia_driver sym53c500_cs_driver = {
875 	.owner		= THIS_MODULE,
876 	.name		= "sym53c500_cs",
877 	.probe		= SYM53C500_probe,
878 	.remove		= SYM53C500_detach,
879 	.id_table       = sym53c500_ids,
880 	.resume		= sym53c500_resume,
881 };
882 module_pcmcia_driver(sym53c500_cs_driver);
883