blob: 78324e056d4c4fae66eecbc6284ddf832da6dc55 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * atari_scsi.c -- Device dependent functions for the Atari generic SCSI port
3 *
4 * Copyright 1994 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
5 *
6 * Loosely based on the work of Robert De Vries' team and added:
7 * - working real DMA
8 * - Falcon support (untested yet!) ++bjoern fixed and now it works
9 * - lots of extensions and bug fixes.
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file COPYING in the main directory of this archive
13 * for more details.
14 *
15 */
16
17
18/**************************************************************************/
19/* */
20/* Notes for Falcon SCSI: */
21/* ---------------------- */
22/* */
23/* Since the Falcon SCSI uses the ST-DMA chip, that is shared among */
24/* several device drivers, locking and unlocking the access to this */
25/* chip is required. But locking is not possible from an interrupt, */
26/* since it puts the process to sleep if the lock is not available. */
27/* This prevents "late" locking of the DMA chip, i.e. locking it just */
28/* before using it, since in case of disconnection-reconnection */
29/* commands, the DMA is started from the reselection interrupt. */
30/* */
31/* Two possible schemes for ST-DMA-locking would be: */
32/* 1) The lock is taken for each command separately and disconnecting */
33/* is forbidden (i.e. can_queue = 1). */
34/* 2) The DMA chip is locked when the first command comes in and */
35/* released when the last command is finished and all queues are */
36/* empty. */
37/* The first alternative would result in bad performance, since the */
38/* interleaving of commands would not be used. The second is unfair to */
39/* other drivers using the ST-DMA, because the queues will seldom be */
40/* totally empty if there is a lot of disk traffic. */
41/* */
42/* For this reasons I decided to employ a more elaborate scheme: */
43/* - First, we give up the lock every time we can (for fairness), this */
44/* means every time a command finishes and there are no other commands */
45/* on the disconnected queue. */
46/* - If there are others waiting to lock the DMA chip, we stop */
47/* issuing commands, i.e. moving them onto the issue queue. */
48/* Because of that, the disconnected queue will run empty in a */
49/* while. Instead we go to sleep on a 'fairness_queue'. */
50/* - If the lock is released, all processes waiting on the fairness */
51/* queue will be woken. The first of them tries to re-lock the DMA, */
52/* the others wait for the first to finish this task. After that, */
53/* they can all run on and do their commands... */
54/* This sounds complicated (and it is it :-(), but it seems to be a */
55/* good compromise between fairness and performance: As long as no one */
56/* else wants to work with the ST-DMA chip, SCSI can go along as */
57/* usual. If now someone else comes, this behaviour is changed to a */
58/* "fairness mode": just already initiated commands are finished and */
59/* then the lock is released. The other one waiting will probably win */
60/* the race for locking the DMA, since it was waiting for longer. And */
61/* after it has finished, SCSI can go ahead again. Finally: I hope I */
62/* have not produced any deadlock possibilities! */
63/* */
64/**************************************************************************/
65
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/interrupt.h>
72#include <linux/init.h>
73#include <linux/nvram.h>
74#include <linux/bitops.h>
Arnd Bergmanneff9cf82014-03-01 20:51:03 +130075#include <linux/wait.h>
Finn Thain3ff228a2014-11-12 16:12:09 +110076#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78#include <asm/setup.h>
79#include <asm/atarihw.h>
80#include <asm/atariints.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <asm/atari_stdma.h>
82#include <asm/atari_stram.h>
83#include <asm/io.h>
84
Finn Thain3ff228a2014-11-12 16:12:09 +110085#include <scsi/scsi_host.h>
86
Finn Thain4e705202014-11-12 16:12:10 +110087/* Definitions for the core NCR5380 driver. */
88
89#define REAL_DMA
90#define SUPPORT_TAGS
91#define MAX_TAGS 32
92
93#define NCR5380_implementation_fields /* none */
94
95#define NCR5380_read(reg) atari_scsi_reg_read(reg)
96#define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value)
97
98#define NCR5380_queue_command atari_scsi_queue_command
99#define NCR5380_abort atari_scsi_abort
100#define NCR5380_show_info atari_scsi_show_info
101#define NCR5380_info atari_scsi_info
102
103#define NCR5380_dma_read_setup(instance, data, count) \
104 atari_scsi_dma_setup(instance, data, count, 0)
105#define NCR5380_dma_write_setup(instance, data, count) \
106 atari_scsi_dma_setup(instance, data, count, 1)
107#define NCR5380_dma_residual(instance) \
108 atari_scsi_dma_residual(instance)
109#define NCR5380_dma_xfer_len(instance, cmd, phase) \
110 atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO))
111
Finn Thain3ff228a2014-11-12 16:12:09 +1100112#include "NCR5380.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Finn Thain4e705202014-11-12 16:12:10 +1100114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#define IS_A_TT() ATARIHW_PRESENT(TT_SCSI)
116
117#define SCSI_DMA_WRITE_P(elt,val) \
118 do { \
119 unsigned long v = val; \
120 tt_scsi_dma.elt##_lo = v & 0xff; \
121 v >>= 8; \
122 tt_scsi_dma.elt##_lmd = v & 0xff; \
123 v >>= 8; \
124 tt_scsi_dma.elt##_hmd = v & 0xff; \
125 v >>= 8; \
126 tt_scsi_dma.elt##_hi = v & 0xff; \
127 } while(0)
128
129#define SCSI_DMA_READ_P(elt) \
130 (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \
131 (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \
132 (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \
133 (unsigned long)tt_scsi_dma.elt##_lo)
134
135
136static inline void SCSI_DMA_SETADR(unsigned long adr)
137{
138 st_dma.dma_lo = (unsigned char)adr;
139 MFPDELAY();
140 adr >>= 8;
141 st_dma.dma_md = (unsigned char)adr;
142 MFPDELAY();
143 adr >>= 8;
144 st_dma.dma_hi = (unsigned char)adr;
145 MFPDELAY();
146}
147
148static inline unsigned long SCSI_DMA_GETADR(void)
149{
150 unsigned long adr;
151 adr = st_dma.dma_lo;
152 MFPDELAY();
153 adr |= (st_dma.dma_md & 0xff) << 8;
154 MFPDELAY();
155 adr |= (st_dma.dma_hi & 0xff) << 16;
156 MFPDELAY();
157 return adr;
158}
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160#define HOSTDATA_DMALEN (((struct NCR5380_hostdata *) \
161 (atari_scsi_host->hostdata))->dma_len)
162
163/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
164 * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
165 * need ten times the standard value... */
166#ifndef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
167#define AFTER_RESET_DELAY (HZ/2)
168#else
169#define AFTER_RESET_DELAY (5*HZ/2)
170#endif
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +0200173static void atari_scsi_fetch_restbytes(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Roman Zippelc28bda22007-05-01 22:32:36 +0200176static struct Scsi_Host *atari_scsi_host;
177static unsigned char (*atari_scsi_reg_read)(unsigned char reg);
178static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180#ifdef REAL_DMA
181static unsigned long atari_dma_residual, atari_dma_startaddr;
182static short atari_dma_active;
183/* pointer to the dribble buffer */
Roman Zippelc28bda22007-05-01 22:32:36 +0200184static char *atari_dma_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185/* precalculated physical address of the dribble buffer */
186static unsigned long atari_dma_phys_buffer;
187/* != 0 tells the Falcon int handler to copy data from the dribble buffer */
188static char *atari_dma_orig_addr;
189/* size of the dribble buffer; 4k seems enough, since the Falcon cannot use
190 * scatter-gather anyway, so most transfers are 1024 byte only. In the rare
191 * cases where requests to physical contiguous buffers have been merged, this
192 * request is <= 4k (one page). So I don't think we have to split transfers
193 * just due to this buffer size...
194 */
195#define STRAM_BUFFER_SIZE (4096)
196/* mask for address bits that can't be used with the ST-DMA */
197static unsigned long atari_dma_stram_mask;
198#define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0)
199/* number of bytes to cut from a transfer to handle NCR overruns */
Roman Zippelc28bda22007-05-01 22:32:36 +0200200static int atari_read_overruns;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201#endif
202
203static int setup_can_queue = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800204module_param(setup_can_queue, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205static int setup_cmd_per_lun = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800206module_param(setup_cmd_per_lun, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207static int setup_sg_tablesize = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800208module_param(setup_sg_tablesize, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209#ifdef SUPPORT_TAGS
210static int setup_use_tagged_queuing = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800211module_param(setup_use_tagged_queuing, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212#endif
213static int setup_hostid = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800214module_param(setup_hostid, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217#if defined(REAL_DMA)
218
Roman Zippelc28bda22007-05-01 22:32:36 +0200219static int scsi_dma_is_ignored_buserr(unsigned char dma_stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 int i;
Roman Zippelc28bda22007-05-01 22:32:36 +0200222 unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 if (dma_stat & 0x01) {
225
226 /* A bus error happens when DMA-ing from the last page of a
227 * physical memory chunk (DMA prefetch!), but that doesn't hurt.
228 * Check for this case:
229 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200230
231 for (i = 0; i < m68k_num_memory; ++i) {
232 end_addr = m68k_memory[i].addr + m68k_memory[i].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 if (end_addr <= addr && addr <= end_addr + 4)
Roman Zippelc28bda22007-05-01 22:32:36 +0200234 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 }
236 }
Roman Zippelc28bda22007-05-01 22:32:36 +0200237 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
239
240
241#if 0
242/* Dead code... wasn't called anyway :-) and causes some trouble, because at
243 * end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has
244 * to clear the DMA int pending bit before it allows other level 6 interrupts.
245 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200246static void scsi_dma_buserr(int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
Roman Zippelc28bda22007-05-01 22:32:36 +0200248 unsigned char dma_stat = tt_scsi_dma.dma_ctrl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
250 /* Don't do anything if a NCR interrupt is pending. Probably it's just
251 * masked... */
Roman Zippelc28bda22007-05-01 22:32:36 +0200252 if (atari_irq_pending(IRQ_TT_MFP_SCSI))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 return;
Roman Zippelc28bda22007-05-01 22:32:36 +0200254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n",
256 SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt));
257 if (dma_stat & 0x80) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200258 if (!scsi_dma_is_ignored_buserr(dma_stat))
259 printk("SCSI DMA bus error -- bad DMA programming!\n");
260 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 /* Under normal circumstances we never should get to this point,
262 * since both interrupts are triggered simultaneously and the 5380
263 * int has higher priority. When this irq is handled, that DMA
264 * interrupt is cleared. So a warning message is printed here.
265 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200266 printk("SCSI DMA intr ?? -- this shouldn't happen!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268}
269#endif
270
271#endif
272
273
Roman Zippelc28bda22007-05-01 22:32:36 +0200274static irqreturn_t scsi_tt_intr(int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275{
276#ifdef REAL_DMA
277 int dma_stat;
278
279 dma_stat = tt_scsi_dma.dma_ctrl;
280
Finn Thaind65e6342014-03-18 11:42:20 +1100281 dprintk(NDEBUG_INTR, "scsi%d: NCR5380 interrupt, DMA status = %02x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 atari_scsi_host->host_no, dma_stat & 0xff);
283
284 /* Look if it was the DMA that has interrupted: First possibility
285 * is that a bus error occurred...
286 */
287 if (dma_stat & 0x80) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200288 if (!scsi_dma_is_ignored_buserr(dma_stat)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n",
290 SCSI_DMA_READ_P(dma_addr));
291 printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!");
292 }
293 }
294
295 /* If the DMA is active but not finished, we have the case
296 * that some other 5380 interrupt occurred within the DMA transfer.
297 * This means we have residual bytes, if the desired end address
298 * is not yet reached. Maybe we have to fetch some bytes from the
299 * rest data register, too. The residual must be calculated from
300 * the address pointer, not the counter register, because only the
301 * addr reg counts bytes not yet written and pending in the rest
302 * data reg!
303 */
304 if ((dma_stat & 0x02) && !(dma_stat & 0x40)) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200305 atari_dma_residual = HOSTDATA_DMALEN - (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Finn Thaind65e6342014-03-18 11:42:20 +1100307 dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 atari_dma_residual);
309
310 if ((signed int)atari_dma_residual < 0)
311 atari_dma_residual = 0;
312 if ((dma_stat & 1) == 0) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200313 /*
314 * After read operations, we maybe have to
315 * transport some rest bytes
316 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 atari_scsi_fetch_restbytes();
Roman Zippelc28bda22007-05-01 22:32:36 +0200318 } else {
319 /*
320 * There seems to be a nasty bug in some SCSI-DMA/NCR
321 * combinations: If a target disconnects while a write
322 * operation is going on, the address register of the
323 * DMA may be a few bytes farer than it actually read.
324 * This is probably due to DMA prefetching and a delay
325 * between DMA and NCR. Experiments showed that the
326 * dma_addr is 9 bytes to high, but this could vary.
327 * The problem is, that the residual is thus calculated
328 * wrong and the next transfer will start behind where
329 * it should. So we round up the residual to the next
330 * multiple of a sector size, if it isn't already a
331 * multiple and the originally expected transfer size
332 * was. The latter condition is there to ensure that
333 * the correction is taken only for "real" data
334 * transfers and not for, e.g., the parameters of some
335 * other command. These shouldn't disconnect anyway.
336 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (atari_dma_residual & 0x1ff) {
Finn Thaind65e6342014-03-18 11:42:20 +1100338 dprintk(NDEBUG_DMA, "SCSI DMA: DMA bug corrected, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 "difference %ld bytes\n",
340 512 - (atari_dma_residual & 0x1ff));
341 atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff;
342 }
343 }
344 tt_scsi_dma.dma_ctrl = 0;
345 }
346
347 /* If the DMA is finished, fetch the rest bytes and turn it off */
348 if (dma_stat & 0x40) {
349 atari_dma_residual = 0;
350 if ((dma_stat & 1) == 0)
351 atari_scsi_fetch_restbytes();
352 tt_scsi_dma.dma_ctrl = 0;
353 }
354
355#endif /* REAL_DMA */
Roman Zippelc28bda22007-05-01 22:32:36 +0200356
Jeff Garzik1e641662007-11-11 19:52:05 -0500357 NCR5380_intr(irq, dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 return IRQ_HANDLED;
360}
361
362
Roman Zippelc28bda22007-05-01 22:32:36 +0200363static irqreturn_t scsi_falcon_intr(int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
365#ifdef REAL_DMA
366 int dma_stat;
367
368 /* Turn off DMA and select sector counter register before
369 * accessing the status register (Atari recommendation!)
370 */
371 st_dma.dma_mode_status = 0x90;
372 dma_stat = st_dma.dma_mode_status;
373
374 /* Bit 0 indicates some error in the DMA process... don't know
375 * what happened exactly (no further docu).
376 */
377 if (!(dma_stat & 0x01)) {
378 /* DMA error */
379 printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR());
380 }
381
382 /* If the DMA was active, but now bit 1 is not clear, it is some
383 * other 5380 interrupt that finishes the DMA transfer. We have to
384 * calculate the number of residual bytes and give a warning if
385 * bytes are stuck in the ST-DMA fifo (there's no way to reach them!)
386 */
387 if (atari_dma_active && (dma_stat & 0x02)) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200388 unsigned long transferred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 transferred = SCSI_DMA_GETADR() - atari_dma_startaddr;
391 /* The ST-DMA address is incremented in 2-byte steps, but the
392 * data are written only in 16-byte chunks. If the number of
393 * transferred bytes is not divisible by 16, the remainder is
394 * lost somewhere in outer space.
395 */
396 if (transferred & 15)
397 printk(KERN_ERR "SCSI DMA error: %ld bytes lost in "
398 "ST-DMA fifo\n", transferred & 15);
399
400 atari_dma_residual = HOSTDATA_DMALEN - transferred;
Finn Thaind65e6342014-03-18 11:42:20 +1100401 dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 atari_dma_residual);
Roman Zippelc28bda22007-05-01 22:32:36 +0200403 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 atari_dma_residual = 0;
405 atari_dma_active = 0;
406
407 if (atari_dma_orig_addr) {
408 /* If the dribble buffer was used on a read operation, copy the DMA-ed
409 * data to the original destination address.
410 */
411 memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr),
412 HOSTDATA_DMALEN - atari_dma_residual);
413 atari_dma_orig_addr = NULL;
414 }
415
416#endif /* REAL_DMA */
417
Jeff Garzik1e641662007-11-11 19:52:05 -0500418 NCR5380_intr(irq, dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 return IRQ_HANDLED;
420}
421
422
423#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +0200424static void atari_scsi_fetch_restbytes(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
426 int nr;
427 char *src, *dst;
428 unsigned long phys_dst;
429
430 /* fetch rest bytes in the DMA register */
431 phys_dst = SCSI_DMA_READ_P(dma_addr);
432 nr = phys_dst & 3;
433 if (nr) {
434 /* there are 'nr' bytes left for the last long address
435 before the DMA pointer */
436 phys_dst ^= nr;
Finn Thaind65e6342014-03-18 11:42:20 +1100437 dprintk(NDEBUG_DMA, "SCSI DMA: there are %d rest bytes for phys addr 0x%08lx",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 nr, phys_dst);
439 /* The content of the DMA pointer is a physical address! */
440 dst = phys_to_virt(phys_dst);
Finn Thaind65e6342014-03-18 11:42:20 +1100441 dprintk(NDEBUG_DMA, " = virt addr %p\n", dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr)
443 *dst++ = *src++;
444 }
445}
446#endif /* REAL_DMA */
447
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449static int falcon_dont_release = 0;
450
451/* This function releases the lock on the DMA chip if there is no
Finn Thain16b29e72014-11-12 16:12:08 +1100452 * connected command and the disconnected queue is empty.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 */
454
Roman Zippelc28bda22007-05-01 22:32:36 +0200455static void falcon_release_lock_if_possible(struct NCR5380_hostdata *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
457 unsigned long flags;
Roman Zippelc28bda22007-05-01 22:32:36 +0200458
459 if (IS_A_TT())
460 return;
461
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 local_irq_save(flags);
463
Finn Thain16b29e72014-11-12 16:12:08 +1100464 if (!hostdata->disconnected_queue &&
465 !hostdata->issue_queue &&
466 !hostdata->connected &&
467 !falcon_dont_release &&
468 stdma_is_locked_by(scsi_falcon_intr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 stdma_release();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471 local_irq_restore(flags);
472}
473
474/* This function manages the locking of the ST-DMA.
475 * If the DMA isn't locked already for SCSI, it tries to lock it by
476 * calling stdma_lock(). But if the DMA is locked by the SCSI code and
477 * there are other drivers waiting for the chip, we do not issue the
Finn Thain16b29e72014-11-12 16:12:08 +1100478 * command immediately but tell the SCSI mid-layer to defer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 */
480
Finn Thain16b29e72014-11-12 16:12:08 +1100481static int falcon_get_lock(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482{
Roman Zippelc28bda22007-05-01 22:32:36 +0200483 if (IS_A_TT())
Finn Thain16b29e72014-11-12 16:12:08 +1100484 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Finn Thain16b29e72014-11-12 16:12:08 +1100486 if (in_interrupt())
487 return stdma_try_lock(scsi_falcon_intr, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Finn Thain16b29e72014-11-12 16:12:08 +1100489 stdma_lock(scsi_falcon_intr, NULL);
490 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491}
492
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100493#ifndef MODULE
494static int __init atari_scsi_setup(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495{
496 /* Format of atascsi parameter is:
497 * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
Finn Thain3ff228a2014-11-12 16:12:09 +1100498 * Defaults depend on TT or Falcon, determined at run time.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 * Negative values mean don't change.
500 */
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100501 int ints[6];
502
503 get_options(str, ARRAY_SIZE(ints), ints);
Roman Zippelc28bda22007-05-01 22:32:36 +0200504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 if (ints[0] < 1) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200506 printk("atari_scsi_setup: no arguments!\n");
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100507 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 }
Finn Thain3ff228a2014-11-12 16:12:09 +1100509 if (ints[0] >= 1)
510 setup_can_queue = ints[1];
511 if (ints[0] >= 2)
512 setup_cmd_per_lun = ints[2];
513 if (ints[0] >= 3)
514 setup_sg_tablesize = ints[3];
515 if (ints[0] >= 4)
516 setup_hostid = ints[4];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517#ifdef SUPPORT_TAGS
Finn Thain3ff228a2014-11-12 16:12:09 +1100518 if (ints[0] >= 5)
519 setup_use_tagged_queuing = ints[5];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520#endif
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100521
522 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100525__setup("atascsi=", atari_scsi_setup);
526#endif /* !MODULE */
527
Roman Zippelc28bda22007-05-01 22:32:36 +0200528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
530static void __init atari_scsi_reset_boot(void)
531{
532 unsigned long end;
Roman Zippelc28bda22007-05-01 22:32:36 +0200533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 /*
535 * Do a SCSI reset to clean up the bus during initialization. No messing
536 * with the queues, interrupts, or locks necessary here.
537 */
538
Roman Zippelc28bda22007-05-01 22:32:36 +0200539 printk("Atari SCSI: resetting the SCSI bus...");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 /* get in phase */
Roman Zippelc28bda22007-05-01 22:32:36 +0200542 NCR5380_write(TARGET_COMMAND_REG,
543 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 /* assert RST */
Roman Zippelc28bda22007-05-01 22:32:36 +0200546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 /* The min. reset hold time is 25us, so 40us should be enough */
Roman Zippelc28bda22007-05-01 22:32:36 +0200548 udelay(50);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 /* reset RST and interrupt */
Roman Zippelc28bda22007-05-01 22:32:36 +0200550 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
551 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
553 end = jiffies + AFTER_RESET_DELAY;
554 while (time_before(jiffies, end))
555 barrier();
556
Roman Zippelc28bda22007-05-01 22:32:36 +0200557 printk(" done\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
559#endif
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561#if defined(REAL_DMA)
562
Geert Uytterhoeven107b5d52011-06-12 20:48:33 +0200563static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance,
564 void *data, unsigned long count,
565 int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
Roman Zippelc28bda22007-05-01 22:32:36 +0200567 unsigned long addr = virt_to_phys(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568
Finn Thaind65e6342014-03-18 11:42:20 +1100569 dprintk(NDEBUG_DMA, "scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 "dir = %d\n", instance->host_no, data, addr, count, dir);
571
572 if (!IS_A_TT() && !STRAM_ADDR(addr)) {
573 /* If we have a non-DMAable address on a Falcon, use the dribble
574 * buffer; 'orig_addr' != 0 in the read case tells the interrupt
575 * handler to copy data from the dribble buffer to the originally
576 * wanted address.
577 */
578 if (dir)
Roman Zippelc28bda22007-05-01 22:32:36 +0200579 memcpy(atari_dma_buffer, data, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 else
581 atari_dma_orig_addr = data;
582 addr = atari_dma_phys_buffer;
583 }
Roman Zippelc28bda22007-05-01 22:32:36 +0200584
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 atari_dma_startaddr = addr; /* Needed for calculating residual later. */
Roman Zippelc28bda22007-05-01 22:32:36 +0200586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 /* Cache cleanup stuff: On writes, push any dirty cache out before sending
588 * it to the peripheral. (Must be done before DMA setup, since at least
589 * the ST-DMA begins to fill internal buffers right after setup. For
590 * reads, invalidate any cache, may be altered after DMA without CPU
591 * knowledge.
Roman Zippelc28bda22007-05-01 22:32:36 +0200592 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 * ++roman: For the Medusa, there's no need at all for that cache stuff,
594 * because the hardware does bus snooping (fine!).
595 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200596 dma_cache_maintenance(addr, count, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598 if (count == 0)
599 printk(KERN_NOTICE "SCSI warning: DMA programmed for 0 bytes !\n");
600
601 if (IS_A_TT()) {
602 tt_scsi_dma.dma_ctrl = dir;
Roman Zippelc28bda22007-05-01 22:32:36 +0200603 SCSI_DMA_WRITE_P(dma_addr, addr);
604 SCSI_DMA_WRITE_P(dma_cnt, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 tt_scsi_dma.dma_ctrl = dir | 2;
Roman Zippelc28bda22007-05-01 22:32:36 +0200606 } else { /* ! IS_A_TT */
607
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 /* set address */
Roman Zippelc28bda22007-05-01 22:32:36 +0200609 SCSI_DMA_SETADR(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 /* toggle direction bit to clear FIFO and set DMA direction */
612 dir <<= 8;
613 st_dma.dma_mode_status = 0x90 | dir;
614 st_dma.dma_mode_status = 0x90 | (dir ^ 0x100);
615 st_dma.dma_mode_status = 0x90 | dir;
616 udelay(40);
617 /* On writes, round up the transfer length to the next multiple of 512
618 * (see also comment at atari_dma_xfer_len()). */
619 st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9;
620 udelay(40);
621 st_dma.dma_mode_status = 0x10 | dir;
622 udelay(40);
623 /* need not restore value of dir, only boolean value is tested */
624 atari_dma_active = 1;
625 }
626
Roman Zippelc28bda22007-05-01 22:32:36 +0200627 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628}
629
630
Roman Zippelc28bda22007-05-01 22:32:36 +0200631static long atari_scsi_dma_residual(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
Roman Zippelc28bda22007-05-01 22:32:36 +0200633 return atari_dma_residual;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634}
635
636
637#define CMD_SURELY_BLOCK_MODE 0
638#define CMD_SURELY_BYTE_MODE 1
639#define CMD_MODE_UNKNOWN 2
640
Finn Thain710ddd02014-11-12 16:12:02 +1100641static int falcon_classify_cmd(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
643 unsigned char opcode = cmd->cmnd[0];
Roman Zippelc28bda22007-05-01 22:32:36 +0200644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 if (opcode == READ_DEFECT_DATA || opcode == READ_LONG ||
Roman Zippelc28bda22007-05-01 22:32:36 +0200646 opcode == READ_BUFFER)
647 return CMD_SURELY_BYTE_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 else if (opcode == READ_6 || opcode == READ_10 ||
649 opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE ||
650 opcode == RECOVER_BUFFERED_DATA) {
651 /* In case of a sequential-access target (tape), special care is
652 * needed here: The transfer is block-mode only if the 'fixed' bit is
653 * set! */
654 if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1))
Roman Zippelc28bda22007-05-01 22:32:36 +0200655 return CMD_SURELY_BYTE_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 else
Roman Zippelc28bda22007-05-01 22:32:36 +0200657 return CMD_SURELY_BLOCK_MODE;
658 } else
659 return CMD_MODE_UNKNOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660}
661
662
663/* This function calculates the number of bytes that can be transferred via
664 * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the
665 * ST-DMA chip. There are only multiples of 512 bytes possible and max.
666 * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not
667 * possible on the Falcon, since that would require to program the DMA for
668 * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have
669 * the overrun problem, so this question is academic :-)
670 */
671
Roman Zippelc28bda22007-05-01 22:32:36 +0200672static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
Finn Thain710ddd02014-11-12 16:12:02 +1100673 struct scsi_cmnd *cmd, int write_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674{
675 unsigned long possible_len, limit;
Adrian Bunk29c8a242008-10-13 21:58:59 +0200676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 if (IS_A_TT())
678 /* TT SCSI DMA can transfer arbitrary #bytes */
Roman Zippelc28bda22007-05-01 22:32:36 +0200679 return wanted_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max.
682 * 255*512 bytes, but this should be enough)
683 *
684 * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands
685 * that return a number of bytes which cannot be known beforehand. In this
686 * case, the given transfer length is an "allocation length". Now it
687 * can happen that this allocation length is a multiple of 512 bytes and
688 * the DMA is used. But if not n*512 bytes really arrive, some input data
689 * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish
690 * between commands that do block transfers and those that do byte
691 * transfers. But this isn't easy... there are lots of vendor specific
692 * commands, and the user can issue any command via the
693 * SCSI_IOCTL_SEND_COMMAND.
694 *
695 * The solution: We classify SCSI commands in 1) surely block-mode cmd.s,
696 * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1)
697 * and 3), the thing to do is obvious: allow any number of blocks via DMA
698 * or none. In case 2), we apply some heuristic: Byte mode is assumed if
699 * the transfer (allocation) length is < 1024, hoping that no cmd. not
700 * explicitly known as byte mode have such big allocation lengths...
701 * BTW, all the discussion above applies only to reads. DMA writes are
702 * unproblematic anyways, since the targets aborts the transfer after
703 * receiving a sufficient number of bytes.
704 *
705 * Another point: If the transfer is from/to an non-ST-RAM address, we
706 * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes.
707 */
708
709 if (write_flag) {
710 /* Write operation can always use the DMA, but the transfer size must
711 * be rounded up to the next multiple of 512 (atari_dma_setup() does
712 * this).
713 */
714 possible_len = wanted_len;
Roman Zippelc28bda22007-05-01 22:32:36 +0200715 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 /* Read operations: if the wanted transfer length is not a multiple of
717 * 512, we cannot use DMA, since the ST-DMA cannot split transfers
718 * (no interrupt on DMA finished!)
719 */
720 if (wanted_len & 0x1ff)
721 possible_len = 0;
722 else {
723 /* Now classify the command (see above) and decide whether it is
724 * allowed to do DMA at all */
Roman Zippelc28bda22007-05-01 22:32:36 +0200725 switch (falcon_classify_cmd(cmd)) {
726 case CMD_SURELY_BLOCK_MODE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 possible_len = wanted_len;
728 break;
Roman Zippelc28bda22007-05-01 22:32:36 +0200729 case CMD_SURELY_BYTE_MODE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 possible_len = 0; /* DMA prohibited */
731 break;
Roman Zippelc28bda22007-05-01 22:32:36 +0200732 case CMD_MODE_UNKNOWN:
733 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 /* For unknown commands assume block transfers if the transfer
735 * size/allocation length is >= 1024 */
736 possible_len = (wanted_len < 1024) ? 0 : wanted_len;
737 break;
738 }
739 }
740 }
Roman Zippelc28bda22007-05-01 22:32:36 +0200741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 /* Last step: apply the hard limit on DMA transfers */
Roman Zippelc28bda22007-05-01 22:32:36 +0200743 limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 STRAM_BUFFER_SIZE : 255*512;
745 if (possible_len > limit)
746 possible_len = limit;
747
748 if (possible_len != wanted_len)
Finn Thaind65e6342014-03-18 11:42:20 +1100749 dprintk(NDEBUG_DMA, "Sorry, must cut DMA transfer size to %ld bytes "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 "instead of %ld\n", possible_len, wanted_len);
751
Roman Zippelc28bda22007-05-01 22:32:36 +0200752 return possible_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753}
754
755
756#endif /* REAL_DMA */
757
758
759/* NCR5380 register access functions
760 *
761 * There are separate functions for TT and Falcon, because the access
762 * methods are quite different. The calling macros NCR5380_read and
763 * NCR5380_write call these functions via function pointers.
764 */
765
Roman Zippelc28bda22007-05-01 22:32:36 +0200766static unsigned char atari_scsi_tt_reg_read(unsigned char reg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Roman Zippelc28bda22007-05-01 22:32:36 +0200768 return tt_scsi_regp[reg * 2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
Roman Zippelc28bda22007-05-01 22:32:36 +0200771static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772{
773 tt_scsi_regp[reg * 2] = value;
774}
775
Roman Zippelc28bda22007-05-01 22:32:36 +0200776static unsigned char atari_scsi_falcon_reg_read(unsigned char reg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
778 dma_wd.dma_mode_status= (u_short)(0x88 + reg);
Roman Zippelc28bda22007-05-01 22:32:36 +0200779 return (u_char)dma_wd.fdc_acces_seccount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
Roman Zippelc28bda22007-05-01 22:32:36 +0200782static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
784 dma_wd.dma_mode_status = (u_short)(0x88 + reg);
785 dma_wd.fdc_acces_seccount = (u_short)value;
786}
787
788
789#include "atari_NCR5380.c"
790
Finn Thain4d3d2a52014-11-12 16:11:52 +1100791static int atari_scsi_bus_reset(struct scsi_cmnd *cmd)
792{
793 int rv;
794 struct NCR5380_hostdata *hostdata = shost_priv(cmd->device->host);
795
796 /* For doing the reset, SCSI interrupts must be disabled first,
797 * since the 5380 raises its IRQ line while _RST is active and we
798 * can't disable interrupts completely, since we need the timer.
799 */
800 /* And abort a maybe active DMA transfer */
801 if (IS_A_TT()) {
802 atari_turnoff_irq(IRQ_TT_MFP_SCSI);
803#ifdef REAL_DMA
804 tt_scsi_dma.dma_ctrl = 0;
805#endif
806 } else {
807 atari_turnoff_irq(IRQ_MFP_FSCSI);
808#ifdef REAL_DMA
809 st_dma.dma_mode_status = 0x90;
810 atari_dma_active = 0;
811 atari_dma_orig_addr = NULL;
812#endif
813 }
814
815 rv = NCR5380_bus_reset(cmd);
816
817 if (IS_A_TT())
818 atari_turnon_irq(IRQ_TT_MFP_SCSI);
819 else
820 atari_turnon_irq(IRQ_MFP_FSCSI);
821
822 if (rv == SUCCESS)
823 falcon_release_lock_if_possible(hostdata);
824
825 return rv;
826}
827
Finn Thain3ff228a2014-11-12 16:12:09 +1100828#define DRV_MODULE_NAME "atari_scsi"
829#define PFX DRV_MODULE_NAME ": "
830
831static struct scsi_host_template atari_scsi_template = {
832 .module = THIS_MODULE,
833 .proc_name = DRV_MODULE_NAME,
Al Virod89537e2013-03-31 13:24:44 -0400834 .show_info = atari_scsi_show_info,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 .name = "Atari native SCSI",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 .info = atari_scsi_info,
837 .queuecommand = atari_scsi_queue_command,
838 .eh_abort_handler = atari_scsi_abort,
839 .eh_bus_reset_handler = atari_scsi_bus_reset,
Finn Thain3ff228a2014-11-12 16:12:09 +1100840 .this_id = 7,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 .use_clustering = DISABLE_CLUSTERING
842};
843
Finn Thain3ff228a2014-11-12 16:12:09 +1100844static int __init atari_scsi_probe(struct platform_device *pdev)
845{
846 struct Scsi_Host *instance;
847 int error;
848 struct resource *irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Finn Thain3ff228a2014-11-12 16:12:09 +1100850 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
851 if (!irq)
852 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Finn Thain3ff228a2014-11-12 16:12:09 +1100854 if (ATARIHW_PRESENT(TT_SCSI)) {
855 atari_scsi_reg_read = atari_scsi_tt_reg_read;
856 atari_scsi_reg_write = atari_scsi_tt_reg_write;
857 } else {
858 atari_scsi_reg_read = atari_scsi_falcon_reg_read;
859 atari_scsi_reg_write = atari_scsi_falcon_reg_write;
860 }
861
862 /* The values for CMD_PER_LUN and CAN_QUEUE are somehow arbitrary.
863 * Higher values should work, too; try it!
864 * (But cmd_per_lun costs memory!)
865 *
866 * But there seems to be a bug somewhere that requires CAN_QUEUE to be
867 * 2*CMD_PER_LUN. At least on a TT, no spurious timeouts seen since
868 * changed CMD_PER_LUN...
869 *
870 * Note: The Falcon currently uses 8/1 setting due to unsolved problems
871 * with cmd_per_lun != 1
872 */
873 if (ATARIHW_PRESENT(TT_SCSI)) {
874 atari_scsi_template.can_queue = 16;
875 atari_scsi_template.cmd_per_lun = 8;
876 atari_scsi_template.sg_tablesize = SG_ALL;
877 } else {
878 atari_scsi_template.can_queue = 8;
879 atari_scsi_template.cmd_per_lun = 1;
880 atari_scsi_template.sg_tablesize = SG_NONE;
881 }
882
883 if (setup_can_queue > 0)
884 atari_scsi_template.can_queue = setup_can_queue;
885
886 if (setup_cmd_per_lun > 0)
887 atari_scsi_template.cmd_per_lun = setup_cmd_per_lun;
888
889 /* Leave sg_tablesize at 0 on a Falcon! */
890 if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0)
891 atari_scsi_template.sg_tablesize = setup_sg_tablesize;
892
893 if (setup_hostid >= 0) {
894 atari_scsi_template.this_id = setup_hostid & 7;
895 } else {
896 /* Test if a host id is set in the NVRam */
897 if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
898 unsigned char b = nvram_read_byte(14);
899
900 /* Arbitration enabled? (for TOS)
901 * If yes, use configured host ID
902 */
903 if (b & 0x80)
904 atari_scsi_template.this_id = b & 7;
905 }
906 }
907
908#ifdef SUPPORT_TAGS
909 if (setup_use_tagged_queuing < 0)
910 setup_use_tagged_queuing = 0;
911#endif
912
913#ifdef REAL_DMA
914 /* If running on a Falcon and if there's TT-Ram (i.e., more than one
915 * memory block, since there's always ST-Ram in a Falcon), then
916 * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers
917 * from/to alternative Ram.
918 */
919 if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) &&
920 m68k_num_memory > 1) {
921 atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI");
922 if (!atari_dma_buffer) {
923 pr_err(PFX "can't allocate ST-RAM double buffer\n");
924 return -ENOMEM;
925 }
926 atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer);
927 atari_dma_orig_addr = 0;
928 }
929#endif
930
931 instance = scsi_host_alloc(&atari_scsi_template,
932 sizeof(struct NCR5380_hostdata));
933 if (!instance) {
934 error = -ENOMEM;
935 goto fail_alloc;
936 }
937 atari_scsi_host = instance;
938
939#ifdef CONFIG_ATARI_SCSI_RESET_BOOT
940 atari_scsi_reset_boot();
941#endif
942
943 instance->irq = irq->start;
944
945 NCR5380_init(instance, 0);
946
947 if (IS_A_TT()) {
948 error = request_irq(instance->irq, scsi_tt_intr, 0,
949 "NCR5380", instance);
950 if (error) {
951 pr_err(PFX "request irq %d failed, aborting\n",
952 instance->irq);
953 goto fail_irq;
954 }
955 tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */
956#ifdef REAL_DMA
957 tt_scsi_dma.dma_ctrl = 0;
958 atari_dma_residual = 0;
959
960 /* While the read overruns (described by Drew Eckhardt in
961 * NCR5380.c) never happened on TTs, they do in fact on the
962 * Medusa (This was the cause why SCSI didn't work right for
963 * so long there.) Since handling the overruns slows down
964 * a bit, I turned the #ifdef's into a runtime condition.
965 *
966 * In principle it should be sufficient to do max. 1 byte with
967 * PIO, but there is another problem on the Medusa with the DMA
968 * rest data register. So 'atari_read_overruns' is currently set
969 * to 4 to avoid having transfers that aren't a multiple of 4.
970 * If the rest data bug is fixed, this can be lowered to 1.
971 */
972 if (MACH_IS_MEDUSA)
973 atari_read_overruns = 4;
974#endif
975 } else {
976 /* Nothing to do for the interrupt: the ST-DMA is initialized
977 * already.
978 */
979#ifdef REAL_DMA
980 atari_dma_residual = 0;
981 atari_dma_active = 0;
982 atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000
983 : 0xff000000);
984#endif
985 }
986
987 error = scsi_add_host(instance, NULL);
988 if (error)
989 goto fail_host;
990
991 platform_set_drvdata(pdev, instance);
992
993 scsi_scan_host(instance);
994 return 0;
995
996fail_host:
997 if (IS_A_TT())
998 free_irq(instance->irq, instance);
999fail_irq:
1000 NCR5380_exit(instance);
1001 scsi_host_put(instance);
1002fail_alloc:
1003 if (atari_dma_buffer)
1004 atari_stram_free(atari_dma_buffer);
1005 return error;
1006}
1007
1008static int __exit atari_scsi_remove(struct platform_device *pdev)
1009{
1010 struct Scsi_Host *instance = platform_get_drvdata(pdev);
1011
1012 scsi_remove_host(instance);
1013 if (IS_A_TT())
1014 free_irq(instance->irq, instance);
1015 NCR5380_exit(instance);
1016 scsi_host_put(instance);
1017 if (atari_dma_buffer)
1018 atari_stram_free(atari_dma_buffer);
1019 return 0;
1020}
1021
1022static struct platform_driver atari_scsi_driver = {
1023 .remove = __exit_p(atari_scsi_remove),
1024 .driver = {
1025 .name = DRV_MODULE_NAME,
1026 .owner = THIS_MODULE,
1027 },
1028};
1029
1030module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe);
1031
1032MODULE_ALIAS("platform:" DRV_MODULE_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033MODULE_LICENSE("GPL");