blob: a59ad94ea52b371272d4878b857f5efa532c4c16 [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
Finn Thainded155b2016-03-23 21:10:30 +110017/*
18 * Notes for Falcon SCSI DMA
19 *
20 * The 5380 device is one of several that all share the DMA chip. Hence
21 * "locking" and "unlocking" access to this chip is required.
22 *
23 * Two possible schemes for ST DMA acquisition by atari_scsi are:
24 * 1) The lock is taken for each command separately (i.e. can_queue == 1).
25 * 2) The lock is taken when the first command arrives and released
26 * when the last command is finished (i.e. can_queue > 1).
27 *
28 * The first alternative limits SCSI bus utilization, since interleaving
29 * commands is not possible. The second gives better performance but is
30 * unfair to other drivers needing to use the ST DMA chip. In order to
31 * allow the IDE and floppy drivers equal access to the ST DMA chip
32 * the default is can_queue == 1.
33 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/interrupt.h>
39#include <linux/init.h>
40#include <linux/nvram.h>
41#include <linux/bitops.h>
Arnd Bergmanneff9cf82014-03-01 20:51:03 +130042#include <linux/wait.h>
Finn Thain3ff228a2014-11-12 16:12:09 +110043#include <linux/platform_device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include <asm/setup.h>
46#include <asm/atarihw.h>
47#include <asm/atariints.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/atari_stdma.h>
49#include <asm/atari_stram.h>
50#include <asm/io.h>
51
Finn Thain3ff228a2014-11-12 16:12:09 +110052#include <scsi/scsi_host.h>
53
Finn Thaine63449c2016-03-23 21:10:13 +110054#define DMA_MIN_SIZE 32
55
Finn Thain4e705202014-11-12 16:12:10 +110056/* Definitions for the core NCR5380 driver. */
57
Finn Thain4e705202014-11-12 16:12:10 +110058#define NCR5380_implementation_fields /* none */
59
60#define NCR5380_read(reg) atari_scsi_reg_read(reg)
61#define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value)
62
63#define NCR5380_queue_command atari_scsi_queue_command
64#define NCR5380_abort atari_scsi_abort
Finn Thain4e705202014-11-12 16:12:10 +110065#define NCR5380_info atari_scsi_info
66
Finn Thain52d3e562016-03-23 21:10:20 +110067#define NCR5380_dma_recv_setup(instance, data, count) \
Finn Thain4e705202014-11-12 16:12:10 +110068 atari_scsi_dma_setup(instance, data, count, 0)
Finn Thain52d3e562016-03-23 21:10:20 +110069#define NCR5380_dma_send_setup(instance, data, count) \
Finn Thain4e705202014-11-12 16:12:10 +110070 atari_scsi_dma_setup(instance, data, count, 1)
71#define NCR5380_dma_residual(instance) \
72 atari_scsi_dma_residual(instance)
73#define NCR5380_dma_xfer_len(instance, cmd, phase) \
74 atari_dma_xfer_len(cmd->SCp.this_residual, cmd, !((phase) & SR_IO))
75
Finn Thaina53a21e2014-11-12 16:12:21 +110076#define NCR5380_acquire_dma_irq(instance) falcon_get_lock(instance)
Finn Thaine3c3da62014-11-12 16:12:15 +110077#define NCR5380_release_dma_irq(instance) falcon_release_lock()
78
Finn Thain3ff228a2014-11-12 16:12:09 +110079#include "NCR5380.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Finn Thain4e705202014-11-12 16:12:10 +110081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#define IS_A_TT() ATARIHW_PRESENT(TT_SCSI)
83
84#define SCSI_DMA_WRITE_P(elt,val) \
85 do { \
86 unsigned long v = val; \
87 tt_scsi_dma.elt##_lo = v & 0xff; \
88 v >>= 8; \
89 tt_scsi_dma.elt##_lmd = v & 0xff; \
90 v >>= 8; \
91 tt_scsi_dma.elt##_hmd = v & 0xff; \
92 v >>= 8; \
93 tt_scsi_dma.elt##_hi = v & 0xff; \
94 } while(0)
95
96#define SCSI_DMA_READ_P(elt) \
97 (((((((unsigned long)tt_scsi_dma.elt##_hi << 8) | \
98 (unsigned long)tt_scsi_dma.elt##_hmd) << 8) | \
99 (unsigned long)tt_scsi_dma.elt##_lmd) << 8) | \
100 (unsigned long)tt_scsi_dma.elt##_lo)
101
102
103static inline void SCSI_DMA_SETADR(unsigned long adr)
104{
105 st_dma.dma_lo = (unsigned char)adr;
106 MFPDELAY();
107 adr >>= 8;
108 st_dma.dma_md = (unsigned char)adr;
109 MFPDELAY();
110 adr >>= 8;
111 st_dma.dma_hi = (unsigned char)adr;
112 MFPDELAY();
113}
114
115static inline unsigned long SCSI_DMA_GETADR(void)
116{
117 unsigned long adr;
118 adr = st_dma.dma_lo;
119 MFPDELAY();
120 adr |= (st_dma.dma_md & 0xff) << 8;
121 MFPDELAY();
122 adr |= (st_dma.dma_hi & 0xff) << 16;
123 MFPDELAY();
124 return adr;
125}
126
Roman Zippelc28bda22007-05-01 22:32:36 +0200127static void atari_scsi_fetch_restbytes(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Roman Zippelc28bda22007-05-01 22:32:36 +0200129static unsigned char (*atari_scsi_reg_read)(unsigned char reg);
130static void (*atari_scsi_reg_write)(unsigned char reg, unsigned char value);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132static unsigned long atari_dma_residual, atari_dma_startaddr;
133static short atari_dma_active;
134/* pointer to the dribble buffer */
Roman Zippelc28bda22007-05-01 22:32:36 +0200135static char *atari_dma_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136/* precalculated physical address of the dribble buffer */
137static unsigned long atari_dma_phys_buffer;
138/* != 0 tells the Falcon int handler to copy data from the dribble buffer */
139static char *atari_dma_orig_addr;
140/* size of the dribble buffer; 4k seems enough, since the Falcon cannot use
141 * scatter-gather anyway, so most transfers are 1024 byte only. In the rare
142 * cases where requests to physical contiguous buffers have been merged, this
143 * request is <= 4k (one page). So I don't think we have to split transfers
144 * just due to this buffer size...
145 */
146#define STRAM_BUFFER_SIZE (4096)
147/* mask for address bits that can't be used with the ST-DMA */
148static unsigned long atari_dma_stram_mask;
149#define STRAM_ADDR(a) (((a) & atari_dma_stram_mask) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151static int setup_can_queue = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800152module_param(setup_can_queue, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153static int setup_cmd_per_lun = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800154module_param(setup_cmd_per_lun, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155static int setup_sg_tablesize = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800156module_param(setup_sg_tablesize, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157static int setup_hostid = -1;
Rusty Russell8d3b33f2006-03-25 03:07:05 -0800158module_param(setup_hostid, int, 0);
Finn Thain9c3f0e22016-01-03 16:05:11 +1100159static int setup_toshiba_delay = -1;
160module_param(setup_toshiba_delay, int, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162
Roman Zippelc28bda22007-05-01 22:32:36 +0200163static int scsi_dma_is_ignored_buserr(unsigned char dma_stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 int i;
Roman Zippelc28bda22007-05-01 22:32:36 +0200166 unsigned long addr = SCSI_DMA_READ_P(dma_addr), end_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 if (dma_stat & 0x01) {
169
170 /* A bus error happens when DMA-ing from the last page of a
171 * physical memory chunk (DMA prefetch!), but that doesn't hurt.
172 * Check for this case:
173 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200174
175 for (i = 0; i < m68k_num_memory; ++i) {
176 end_addr = m68k_memory[i].addr + m68k_memory[i].size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 if (end_addr <= addr && addr <= end_addr + 4)
Roman Zippelc28bda22007-05-01 22:32:36 +0200178 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180 }
Roman Zippelc28bda22007-05-01 22:32:36 +0200181 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
183
184
185#if 0
186/* Dead code... wasn't called anyway :-) and causes some trouble, because at
187 * end-of-DMA, both SCSI ints are triggered simultaneously, so the NCR int has
188 * to clear the DMA int pending bit before it allows other level 6 interrupts.
189 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200190static void scsi_dma_buserr(int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Roman Zippelc28bda22007-05-01 22:32:36 +0200192 unsigned char dma_stat = tt_scsi_dma.dma_ctrl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 /* Don't do anything if a NCR interrupt is pending. Probably it's just
195 * masked... */
Roman Zippelc28bda22007-05-01 22:32:36 +0200196 if (atari_irq_pending(IRQ_TT_MFP_SCSI))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return;
Roman Zippelc28bda22007-05-01 22:32:36 +0200198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 printk("Bad SCSI DMA interrupt! dma_addr=0x%08lx dma_stat=%02x dma_cnt=%08lx\n",
200 SCSI_DMA_READ_P(dma_addr), dma_stat, SCSI_DMA_READ_P(dma_cnt));
201 if (dma_stat & 0x80) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200202 if (!scsi_dma_is_ignored_buserr(dma_stat))
203 printk("SCSI DMA bus error -- bad DMA programming!\n");
204 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 /* Under normal circumstances we never should get to this point,
206 * since both interrupts are triggered simultaneously and the 5380
207 * int has higher priority. When this irq is handled, that DMA
208 * interrupt is cleared. So a warning message is printed here.
209 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200210 printk("SCSI DMA intr ?? -- this shouldn't happen!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
212}
213#endif
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Finn Thaincd461402016-01-03 16:06:06 +1100216static irqreturn_t scsi_tt_intr(int irq, void *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
Finn Thaincd461402016-01-03 16:06:06 +1100218 struct Scsi_Host *instance = dev;
219 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 int dma_stat;
221
222 dma_stat = tt_scsi_dma.dma_ctrl;
223
Finn Thaincd461402016-01-03 16:06:06 +1100224 dsprintk(NDEBUG_INTR, instance, "NCR5380 interrupt, DMA status = %02x\n",
225 dma_stat & 0xff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227 /* Look if it was the DMA that has interrupted: First possibility
228 * is that a bus error occurred...
229 */
230 if (dma_stat & 0x80) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200231 if (!scsi_dma_is_ignored_buserr(dma_stat)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 printk(KERN_ERR "SCSI DMA caused bus error near 0x%08lx\n",
233 SCSI_DMA_READ_P(dma_addr));
234 printk(KERN_CRIT "SCSI DMA bus error -- bad DMA programming!");
235 }
236 }
237
238 /* If the DMA is active but not finished, we have the case
239 * that some other 5380 interrupt occurred within the DMA transfer.
240 * This means we have residual bytes, if the desired end address
241 * is not yet reached. Maybe we have to fetch some bytes from the
242 * rest data register, too. The residual must be calculated from
243 * the address pointer, not the counter register, because only the
244 * addr reg counts bytes not yet written and pending in the rest
245 * data reg!
246 */
247 if ((dma_stat & 0x02) && !(dma_stat & 0x40)) {
Finn Thaincd461402016-01-03 16:06:06 +1100248 atari_dma_residual = hostdata->dma_len -
249 (SCSI_DMA_READ_P(dma_addr) - atari_dma_startaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Finn Thaind65e6342014-03-18 11:42:20 +1100251 dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 atari_dma_residual);
253
254 if ((signed int)atari_dma_residual < 0)
255 atari_dma_residual = 0;
256 if ((dma_stat & 1) == 0) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200257 /*
258 * After read operations, we maybe have to
259 * transport some rest bytes
260 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 atari_scsi_fetch_restbytes();
Roman Zippelc28bda22007-05-01 22:32:36 +0200262 } else {
263 /*
264 * There seems to be a nasty bug in some SCSI-DMA/NCR
265 * combinations: If a target disconnects while a write
266 * operation is going on, the address register of the
267 * DMA may be a few bytes farer than it actually read.
268 * This is probably due to DMA prefetching and a delay
269 * between DMA and NCR. Experiments showed that the
270 * dma_addr is 9 bytes to high, but this could vary.
271 * The problem is, that the residual is thus calculated
272 * wrong and the next transfer will start behind where
273 * it should. So we round up the residual to the next
274 * multiple of a sector size, if it isn't already a
275 * multiple and the originally expected transfer size
276 * was. The latter condition is there to ensure that
277 * the correction is taken only for "real" data
278 * transfers and not for, e.g., the parameters of some
279 * other command. These shouldn't disconnect anyway.
280 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (atari_dma_residual & 0x1ff) {
Finn Thaind65e6342014-03-18 11:42:20 +1100282 dprintk(NDEBUG_DMA, "SCSI DMA: DMA bug corrected, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 "difference %ld bytes\n",
284 512 - (atari_dma_residual & 0x1ff));
285 atari_dma_residual = (atari_dma_residual + 511) & ~0x1ff;
286 }
287 }
288 tt_scsi_dma.dma_ctrl = 0;
289 }
290
291 /* If the DMA is finished, fetch the rest bytes and turn it off */
292 if (dma_stat & 0x40) {
293 atari_dma_residual = 0;
294 if ((dma_stat & 1) == 0)
295 atari_scsi_fetch_restbytes();
296 tt_scsi_dma.dma_ctrl = 0;
297 }
298
Finn Thaincd461402016-01-03 16:06:06 +1100299 NCR5380_intr(irq, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return IRQ_HANDLED;
302}
303
304
Finn Thaincd461402016-01-03 16:06:06 +1100305static irqreturn_t scsi_falcon_intr(int irq, void *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
Finn Thaincd461402016-01-03 16:06:06 +1100307 struct Scsi_Host *instance = dev;
308 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 int dma_stat;
310
311 /* Turn off DMA and select sector counter register before
312 * accessing the status register (Atari recommendation!)
313 */
314 st_dma.dma_mode_status = 0x90;
315 dma_stat = st_dma.dma_mode_status;
316
317 /* Bit 0 indicates some error in the DMA process... don't know
318 * what happened exactly (no further docu).
319 */
320 if (!(dma_stat & 0x01)) {
321 /* DMA error */
322 printk(KERN_CRIT "SCSI DMA error near 0x%08lx!\n", SCSI_DMA_GETADR());
323 }
324
325 /* If the DMA was active, but now bit 1 is not clear, it is some
326 * other 5380 interrupt that finishes the DMA transfer. We have to
327 * calculate the number of residual bytes and give a warning if
328 * bytes are stuck in the ST-DMA fifo (there's no way to reach them!)
329 */
330 if (atari_dma_active && (dma_stat & 0x02)) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200331 unsigned long transferred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 transferred = SCSI_DMA_GETADR() - atari_dma_startaddr;
334 /* The ST-DMA address is incremented in 2-byte steps, but the
335 * data are written only in 16-byte chunks. If the number of
336 * transferred bytes is not divisible by 16, the remainder is
337 * lost somewhere in outer space.
338 */
339 if (transferred & 15)
340 printk(KERN_ERR "SCSI DMA error: %ld bytes lost in "
341 "ST-DMA fifo\n", transferred & 15);
342
Finn Thaincd461402016-01-03 16:06:06 +1100343 atari_dma_residual = hostdata->dma_len - transferred;
Finn Thaind65e6342014-03-18 11:42:20 +1100344 dprintk(NDEBUG_DMA, "SCSI DMA: There are %ld residual bytes.\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 atari_dma_residual);
Roman Zippelc28bda22007-05-01 22:32:36 +0200346 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 atari_dma_residual = 0;
348 atari_dma_active = 0;
349
350 if (atari_dma_orig_addr) {
351 /* If the dribble buffer was used on a read operation, copy the DMA-ed
352 * data to the original destination address.
353 */
354 memcpy(atari_dma_orig_addr, phys_to_virt(atari_dma_startaddr),
Finn Thaincd461402016-01-03 16:06:06 +1100355 hostdata->dma_len - atari_dma_residual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 atari_dma_orig_addr = NULL;
357 }
358
Finn Thaincd461402016-01-03 16:06:06 +1100359 NCR5380_intr(irq, dev);
360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 return IRQ_HANDLED;
362}
363
364
Roman Zippelc28bda22007-05-01 22:32:36 +0200365static void atari_scsi_fetch_restbytes(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
367 int nr;
368 char *src, *dst;
369 unsigned long phys_dst;
370
371 /* fetch rest bytes in the DMA register */
372 phys_dst = SCSI_DMA_READ_P(dma_addr);
373 nr = phys_dst & 3;
374 if (nr) {
375 /* there are 'nr' bytes left for the last long address
376 before the DMA pointer */
377 phys_dst ^= nr;
Finn Thaind65e6342014-03-18 11:42:20 +1100378 dprintk(NDEBUG_DMA, "SCSI DMA: there are %d rest bytes for phys addr 0x%08lx",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 nr, phys_dst);
380 /* The content of the DMA pointer is a physical address! */
381 dst = phys_to_virt(phys_dst);
Finn Thaind65e6342014-03-18 11:42:20 +1100382 dprintk(NDEBUG_DMA, " = virt addr %p\n", dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 for (src = (char *)&tt_scsi_dma.dma_restdata; nr != 0; --nr)
384 *dst++ = *src++;
385 }
386}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389/* This function releases the lock on the DMA chip if there is no
Finn Thain16b29e72014-11-12 16:12:08 +1100390 * connected command and the disconnected queue is empty.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 */
392
Finn Thaine3c3da62014-11-12 16:12:15 +1100393static void falcon_release_lock(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394{
Roman Zippelc28bda22007-05-01 22:32:36 +0200395 if (IS_A_TT())
396 return;
397
Finn Thaine3c3da62014-11-12 16:12:15 +1100398 if (stdma_is_locked_by(scsi_falcon_intr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 stdma_release();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
402/* This function manages the locking of the ST-DMA.
403 * If the DMA isn't locked already for SCSI, it tries to lock it by
404 * calling stdma_lock(). But if the DMA is locked by the SCSI code and
405 * there are other drivers waiting for the chip, we do not issue the
Finn Thain16b29e72014-11-12 16:12:08 +1100406 * command immediately but tell the SCSI mid-layer to defer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 */
408
Finn Thaina53a21e2014-11-12 16:12:21 +1100409static int falcon_get_lock(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Roman Zippelc28bda22007-05-01 22:32:36 +0200411 if (IS_A_TT())
Finn Thain16b29e72014-11-12 16:12:08 +1100412 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Finn Thainded155b2016-03-23 21:10:30 +1100414 if (stdma_is_locked_by(scsi_falcon_intr) &&
415 instance->hostt->can_queue > 1)
416 return 1;
417
Finn Thain16b29e72014-11-12 16:12:08 +1100418 if (in_interrupt())
Finn Thaina53a21e2014-11-12 16:12:21 +1100419 return stdma_try_lock(scsi_falcon_intr, instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Finn Thaina53a21e2014-11-12 16:12:21 +1100421 stdma_lock(scsi_falcon_intr, instance);
Finn Thain16b29e72014-11-12 16:12:08 +1100422 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423}
424
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100425#ifndef MODULE
426static int __init atari_scsi_setup(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
428 /* Format of atascsi parameter is:
429 * atascsi=<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
Finn Thain3ff228a2014-11-12 16:12:09 +1100430 * Defaults depend on TT or Falcon, determined at run time.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 * Negative values mean don't change.
432 */
Finn Thain9c3f0e22016-01-03 16:05:11 +1100433 int ints[8];
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100434
435 get_options(str, ARRAY_SIZE(ints), ints);
Roman Zippelc28bda22007-05-01 22:32:36 +0200436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 if (ints[0] < 1) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200438 printk("atari_scsi_setup: no arguments!\n");
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100439 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 }
Finn Thain3ff228a2014-11-12 16:12:09 +1100441 if (ints[0] >= 1)
442 setup_can_queue = ints[1];
443 if (ints[0] >= 2)
444 setup_cmd_per_lun = ints[2];
445 if (ints[0] >= 3)
446 setup_sg_tablesize = ints[3];
447 if (ints[0] >= 4)
448 setup_hostid = ints[4];
Finn Thainc4ec6f92016-03-23 21:10:22 +1100449 /* ints[5] (use_tagged_queuing) is ignored */
Finn Thain9c3f0e22016-01-03 16:05:11 +1100450 /* ints[6] (use_pdma) is ignored */
451 if (ints[0] >= 7)
452 setup_toshiba_delay = ints[7];
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100453
454 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455}
456
Geert Uytterhoeven7b54e432012-03-18 11:54:40 +0100457__setup("atascsi=", atari_scsi_setup);
458#endif /* !MODULE */
459
Roman Zippelc28bda22007-05-01 22:32:36 +0200460
Geert Uytterhoeven107b5d52011-06-12 20:48:33 +0200461static unsigned long atari_scsi_dma_setup(struct Scsi_Host *instance,
462 void *data, unsigned long count,
463 int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
Roman Zippelc28bda22007-05-01 22:32:36 +0200465 unsigned long addr = virt_to_phys(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
Finn Thaind65e6342014-03-18 11:42:20 +1100467 dprintk(NDEBUG_DMA, "scsi%d: setting up dma, data = %p, phys = %lx, count = %ld, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 "dir = %d\n", instance->host_no, data, addr, count, dir);
469
470 if (!IS_A_TT() && !STRAM_ADDR(addr)) {
471 /* If we have a non-DMAable address on a Falcon, use the dribble
472 * buffer; 'orig_addr' != 0 in the read case tells the interrupt
473 * handler to copy data from the dribble buffer to the originally
474 * wanted address.
475 */
476 if (dir)
Roman Zippelc28bda22007-05-01 22:32:36 +0200477 memcpy(atari_dma_buffer, data, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 else
479 atari_dma_orig_addr = data;
480 addr = atari_dma_phys_buffer;
481 }
Roman Zippelc28bda22007-05-01 22:32:36 +0200482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 atari_dma_startaddr = addr; /* Needed for calculating residual later. */
Roman Zippelc28bda22007-05-01 22:32:36 +0200484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 /* Cache cleanup stuff: On writes, push any dirty cache out before sending
486 * it to the peripheral. (Must be done before DMA setup, since at least
487 * the ST-DMA begins to fill internal buffers right after setup. For
488 * reads, invalidate any cache, may be altered after DMA without CPU
489 * knowledge.
Roman Zippelc28bda22007-05-01 22:32:36 +0200490 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 * ++roman: For the Medusa, there's no need at all for that cache stuff,
492 * because the hardware does bus snooping (fine!).
493 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200494 dma_cache_maintenance(addr, count, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (IS_A_TT()) {
497 tt_scsi_dma.dma_ctrl = dir;
Roman Zippelc28bda22007-05-01 22:32:36 +0200498 SCSI_DMA_WRITE_P(dma_addr, addr);
499 SCSI_DMA_WRITE_P(dma_cnt, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 tt_scsi_dma.dma_ctrl = dir | 2;
Roman Zippelc28bda22007-05-01 22:32:36 +0200501 } else { /* ! IS_A_TT */
502
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 /* set address */
Roman Zippelc28bda22007-05-01 22:32:36 +0200504 SCSI_DMA_SETADR(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 /* toggle direction bit to clear FIFO and set DMA direction */
507 dir <<= 8;
508 st_dma.dma_mode_status = 0x90 | dir;
509 st_dma.dma_mode_status = 0x90 | (dir ^ 0x100);
510 st_dma.dma_mode_status = 0x90 | dir;
511 udelay(40);
512 /* On writes, round up the transfer length to the next multiple of 512
513 * (see also comment at atari_dma_xfer_len()). */
514 st_dma.fdc_acces_seccount = (count + (dir ? 511 : 0)) >> 9;
515 udelay(40);
516 st_dma.dma_mode_status = 0x10 | dir;
517 udelay(40);
518 /* need not restore value of dir, only boolean value is tested */
519 atari_dma_active = 1;
520 }
521
Roman Zippelc28bda22007-05-01 22:32:36 +0200522 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
525
Roman Zippelc28bda22007-05-01 22:32:36 +0200526static long atari_scsi_dma_residual(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527{
Roman Zippelc28bda22007-05-01 22:32:36 +0200528 return atari_dma_residual;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
531
532#define CMD_SURELY_BLOCK_MODE 0
533#define CMD_SURELY_BYTE_MODE 1
534#define CMD_MODE_UNKNOWN 2
535
Finn Thain710ddd02014-11-12 16:12:02 +1100536static int falcon_classify_cmd(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537{
538 unsigned char opcode = cmd->cmnd[0];
Roman Zippelc28bda22007-05-01 22:32:36 +0200539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (opcode == READ_DEFECT_DATA || opcode == READ_LONG ||
Roman Zippelc28bda22007-05-01 22:32:36 +0200541 opcode == READ_BUFFER)
542 return CMD_SURELY_BYTE_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 else if (opcode == READ_6 || opcode == READ_10 ||
544 opcode == 0xa8 /* READ_12 */ || opcode == READ_REVERSE ||
545 opcode == RECOVER_BUFFERED_DATA) {
546 /* In case of a sequential-access target (tape), special care is
547 * needed here: The transfer is block-mode only if the 'fixed' bit is
548 * set! */
549 if (cmd->device->type == TYPE_TAPE && !(cmd->cmnd[1] & 1))
Roman Zippelc28bda22007-05-01 22:32:36 +0200550 return CMD_SURELY_BYTE_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 else
Roman Zippelc28bda22007-05-01 22:32:36 +0200552 return CMD_SURELY_BLOCK_MODE;
553 } else
554 return CMD_MODE_UNKNOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
557
558/* This function calculates the number of bytes that can be transferred via
559 * DMA. On the TT, this is arbitrary, but on the Falcon we have to use the
560 * ST-DMA chip. There are only multiples of 512 bytes possible and max.
561 * 255*512 bytes :-( This means also, that defining READ_OVERRUNS is not
562 * possible on the Falcon, since that would require to program the DMA for
563 * n*512 - atari_read_overrun bytes. But it seems that the Falcon doesn't have
564 * the overrun problem, so this question is academic :-)
565 */
566
Roman Zippelc28bda22007-05-01 22:32:36 +0200567static unsigned long atari_dma_xfer_len(unsigned long wanted_len,
Finn Thain710ddd02014-11-12 16:12:02 +1100568 struct scsi_cmnd *cmd, int write_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
570 unsigned long possible_len, limit;
Adrian Bunk29c8a242008-10-13 21:58:59 +0200571
Finn Thaine63449c2016-03-23 21:10:13 +1100572 if (wanted_len < DMA_MIN_SIZE)
573 return 0;
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 if (IS_A_TT())
576 /* TT SCSI DMA can transfer arbitrary #bytes */
Roman Zippelc28bda22007-05-01 22:32:36 +0200577 return wanted_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 /* ST DMA chip is stupid -- only multiples of 512 bytes! (and max.
580 * 255*512 bytes, but this should be enough)
581 *
582 * ++roman: Aaargl! Another Falcon-SCSI problem... There are some commands
583 * that return a number of bytes which cannot be known beforehand. In this
584 * case, the given transfer length is an "allocation length". Now it
585 * can happen that this allocation length is a multiple of 512 bytes and
586 * the DMA is used. But if not n*512 bytes really arrive, some input data
587 * will be lost in the ST-DMA's FIFO :-( Thus, we have to distinguish
588 * between commands that do block transfers and those that do byte
589 * transfers. But this isn't easy... there are lots of vendor specific
590 * commands, and the user can issue any command via the
591 * SCSI_IOCTL_SEND_COMMAND.
592 *
593 * The solution: We classify SCSI commands in 1) surely block-mode cmd.s,
594 * 2) surely byte-mode cmd.s and 3) cmd.s with unknown mode. In case 1)
595 * and 3), the thing to do is obvious: allow any number of blocks via DMA
596 * or none. In case 2), we apply some heuristic: Byte mode is assumed if
597 * the transfer (allocation) length is < 1024, hoping that no cmd. not
598 * explicitly known as byte mode have such big allocation lengths...
599 * BTW, all the discussion above applies only to reads. DMA writes are
600 * unproblematic anyways, since the targets aborts the transfer after
601 * receiving a sufficient number of bytes.
602 *
603 * Another point: If the transfer is from/to an non-ST-RAM address, we
604 * use the dribble buffer and thus can do only STRAM_BUFFER_SIZE bytes.
605 */
606
607 if (write_flag) {
608 /* Write operation can always use the DMA, but the transfer size must
609 * be rounded up to the next multiple of 512 (atari_dma_setup() does
610 * this).
611 */
612 possible_len = wanted_len;
Roman Zippelc28bda22007-05-01 22:32:36 +0200613 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 /* Read operations: if the wanted transfer length is not a multiple of
615 * 512, we cannot use DMA, since the ST-DMA cannot split transfers
616 * (no interrupt on DMA finished!)
617 */
618 if (wanted_len & 0x1ff)
619 possible_len = 0;
620 else {
621 /* Now classify the command (see above) and decide whether it is
622 * allowed to do DMA at all */
Roman Zippelc28bda22007-05-01 22:32:36 +0200623 switch (falcon_classify_cmd(cmd)) {
624 case CMD_SURELY_BLOCK_MODE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 possible_len = wanted_len;
626 break;
Roman Zippelc28bda22007-05-01 22:32:36 +0200627 case CMD_SURELY_BYTE_MODE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 possible_len = 0; /* DMA prohibited */
629 break;
Roman Zippelc28bda22007-05-01 22:32:36 +0200630 case CMD_MODE_UNKNOWN:
631 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 /* For unknown commands assume block transfers if the transfer
633 * size/allocation length is >= 1024 */
634 possible_len = (wanted_len < 1024) ? 0 : wanted_len;
635 break;
636 }
637 }
638 }
Roman Zippelc28bda22007-05-01 22:32:36 +0200639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 /* Last step: apply the hard limit on DMA transfers */
Roman Zippelc28bda22007-05-01 22:32:36 +0200641 limit = (atari_dma_buffer && !STRAM_ADDR(virt_to_phys(cmd->SCp.ptr))) ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 STRAM_BUFFER_SIZE : 255*512;
643 if (possible_len > limit)
644 possible_len = limit;
645
646 if (possible_len != wanted_len)
Finn Thaind65e6342014-03-18 11:42:20 +1100647 dprintk(NDEBUG_DMA, "Sorry, must cut DMA transfer size to %ld bytes "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 "instead of %ld\n", possible_len, wanted_len);
649
Roman Zippelc28bda22007-05-01 22:32:36 +0200650 return possible_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651}
652
653
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654/* NCR5380 register access functions
655 *
656 * There are separate functions for TT and Falcon, because the access
657 * methods are quite different. The calling macros NCR5380_read and
658 * NCR5380_write call these functions via function pointers.
659 */
660
Roman Zippelc28bda22007-05-01 22:32:36 +0200661static unsigned char atari_scsi_tt_reg_read(unsigned char reg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
Roman Zippelc28bda22007-05-01 22:32:36 +0200663 return tt_scsi_regp[reg * 2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664}
665
Roman Zippelc28bda22007-05-01 22:32:36 +0200666static void atari_scsi_tt_reg_write(unsigned char reg, unsigned char value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667{
668 tt_scsi_regp[reg * 2] = value;
669}
670
Roman Zippelc28bda22007-05-01 22:32:36 +0200671static unsigned char atari_scsi_falcon_reg_read(unsigned char reg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672{
673 dma_wd.dma_mode_status= (u_short)(0x88 + reg);
Roman Zippelc28bda22007-05-01 22:32:36 +0200674 return (u_char)dma_wd.fdc_acces_seccount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675}
676
Roman Zippelc28bda22007-05-01 22:32:36 +0200677static void atari_scsi_falcon_reg_write(unsigned char reg, unsigned char value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678{
679 dma_wd.dma_mode_status = (u_short)(0x88 + reg);
680 dma_wd.fdc_acces_seccount = (u_short)value;
681}
682
683
Finn Thain52d3e562016-03-23 21:10:20 +1100684#include "NCR5380.c"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Finn Thain4d3d2a52014-11-12 16:11:52 +1100686static int atari_scsi_bus_reset(struct scsi_cmnd *cmd)
687{
688 int rv;
Finn Thaine3c3da62014-11-12 16:12:15 +1100689 unsigned long flags;
Finn Thain4d3d2a52014-11-12 16:11:52 +1100690
Finn Thaine3c3da62014-11-12 16:12:15 +1100691 local_irq_save(flags);
692
Finn Thaine3c3da62014-11-12 16:12:15 +1100693 /* Abort a maybe active DMA transfer */
Finn Thain4d3d2a52014-11-12 16:11:52 +1100694 if (IS_A_TT()) {
Finn Thain4d3d2a52014-11-12 16:11:52 +1100695 tt_scsi_dma.dma_ctrl = 0;
Finn Thain4d3d2a52014-11-12 16:11:52 +1100696 } else {
Finn Thain4d3d2a52014-11-12 16:11:52 +1100697 st_dma.dma_mode_status = 0x90;
698 atari_dma_active = 0;
699 atari_dma_orig_addr = NULL;
Finn Thain4d3d2a52014-11-12 16:11:52 +1100700 }
701
702 rv = NCR5380_bus_reset(cmd);
703
Finn Thaine3c3da62014-11-12 16:12:15 +1100704 /* The 5380 raises its IRQ line while _RST is active but the ST DMA
705 * "lock" has been released so this interrupt may end up handled by
706 * floppy or IDE driver (if one of them holds the lock). The NCR5380
707 * interrupt flag has been cleared already.
708 */
Finn Thain4d3d2a52014-11-12 16:11:52 +1100709
Finn Thaine3c3da62014-11-12 16:12:15 +1100710 local_irq_restore(flags);
Finn Thain4d3d2a52014-11-12 16:11:52 +1100711
712 return rv;
713}
714
Finn Thain3ff228a2014-11-12 16:12:09 +1100715#define DRV_MODULE_NAME "atari_scsi"
716#define PFX DRV_MODULE_NAME ": "
717
718static struct scsi_host_template atari_scsi_template = {
719 .module = THIS_MODULE,
720 .proc_name = DRV_MODULE_NAME,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 .name = "Atari native SCSI",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 .info = atari_scsi_info,
723 .queuecommand = atari_scsi_queue_command,
724 .eh_abort_handler = atari_scsi_abort,
725 .eh_bus_reset_handler = atari_scsi_bus_reset,
Finn Thain3ff228a2014-11-12 16:12:09 +1100726 .this_id = 7,
Finn Thaina5217a82016-03-23 21:10:29 +1100727 .cmd_per_lun = 2,
Finn Thainaa2e2cb2016-01-03 16:05:48 +1100728 .use_clustering = DISABLE_CLUSTERING,
Finn Thain32b26a12016-01-03 16:05:58 +1100729 .cmd_size = NCR5380_CMD_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730};
731
Finn Thain3ff228a2014-11-12 16:12:09 +1100732static int __init atari_scsi_probe(struct platform_device *pdev)
733{
734 struct Scsi_Host *instance;
735 int error;
736 struct resource *irq;
Finn Thainef1081c2014-11-12 16:12:14 +1100737 int host_flags = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Finn Thain3ff228a2014-11-12 16:12:09 +1100739 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
740 if (!irq)
741 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Finn Thain3ff228a2014-11-12 16:12:09 +1100743 if (ATARIHW_PRESENT(TT_SCSI)) {
744 atari_scsi_reg_read = atari_scsi_tt_reg_read;
745 atari_scsi_reg_write = atari_scsi_tt_reg_write;
746 } else {
747 atari_scsi_reg_read = atari_scsi_falcon_reg_read;
748 atari_scsi_reg_write = atari_scsi_falcon_reg_write;
749 }
750
Finn Thain3ff228a2014-11-12 16:12:09 +1100751 if (ATARIHW_PRESENT(TT_SCSI)) {
752 atari_scsi_template.can_queue = 16;
Finn Thain3ff228a2014-11-12 16:12:09 +1100753 atari_scsi_template.sg_tablesize = SG_ALL;
754 } else {
Finn Thainded155b2016-03-23 21:10:30 +1100755 atari_scsi_template.can_queue = 1;
Finn Thain3ff228a2014-11-12 16:12:09 +1100756 atari_scsi_template.sg_tablesize = SG_NONE;
757 }
758
759 if (setup_can_queue > 0)
760 atari_scsi_template.can_queue = setup_can_queue;
761
762 if (setup_cmd_per_lun > 0)
763 atari_scsi_template.cmd_per_lun = setup_cmd_per_lun;
764
765 /* Leave sg_tablesize at 0 on a Falcon! */
766 if (ATARIHW_PRESENT(TT_SCSI) && setup_sg_tablesize >= 0)
767 atari_scsi_template.sg_tablesize = setup_sg_tablesize;
768
769 if (setup_hostid >= 0) {
770 atari_scsi_template.this_id = setup_hostid & 7;
771 } else {
772 /* Test if a host id is set in the NVRam */
773 if (ATARIHW_PRESENT(TT_CLK) && nvram_check_checksum()) {
Finn Thain6225a162016-01-03 16:05:02 +1100774 unsigned char b = nvram_read_byte(16);
Finn Thain3ff228a2014-11-12 16:12:09 +1100775
776 /* Arbitration enabled? (for TOS)
777 * If yes, use configured host ID
778 */
779 if (b & 0x80)
780 atari_scsi_template.this_id = b & 7;
781 }
782 }
783
Finn Thain3ff228a2014-11-12 16:12:09 +1100784 /* If running on a Falcon and if there's TT-Ram (i.e., more than one
785 * memory block, since there's always ST-Ram in a Falcon), then
786 * allocate a STRAM_BUFFER_SIZE byte dribble buffer for transfers
787 * from/to alternative Ram.
788 */
789 if (ATARIHW_PRESENT(ST_SCSI) && !ATARIHW_PRESENT(EXTD_DMA) &&
790 m68k_num_memory > 1) {
791 atari_dma_buffer = atari_stram_alloc(STRAM_BUFFER_SIZE, "SCSI");
792 if (!atari_dma_buffer) {
793 pr_err(PFX "can't allocate ST-RAM double buffer\n");
794 return -ENOMEM;
795 }
796 atari_dma_phys_buffer = atari_stram_to_phys(atari_dma_buffer);
797 atari_dma_orig_addr = 0;
798 }
Finn Thain3ff228a2014-11-12 16:12:09 +1100799
800 instance = scsi_host_alloc(&atari_scsi_template,
801 sizeof(struct NCR5380_hostdata));
802 if (!instance) {
803 error = -ENOMEM;
804 goto fail_alloc;
805 }
Finn Thain3ff228a2014-11-12 16:12:09 +1100806
Finn Thain3ff228a2014-11-12 16:12:09 +1100807 instance->irq = irq->start;
808
Finn Thainef1081c2014-11-12 16:12:14 +1100809 host_flags |= IS_A_TT() ? 0 : FLAG_LATE_DMA_SETUP;
Finn Thain9c3f0e22016-01-03 16:05:11 +1100810 host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
Finn Thainca513fc2014-11-12 16:12:19 +1100811
Finn Thain0ad0eff2016-01-03 16:05:21 +1100812 error = NCR5380_init(instance, host_flags);
813 if (error)
814 goto fail_init;
Finn Thain3ff228a2014-11-12 16:12:09 +1100815
816 if (IS_A_TT()) {
817 error = request_irq(instance->irq, scsi_tt_intr, 0,
818 "NCR5380", instance);
819 if (error) {
820 pr_err(PFX "request irq %d failed, aborting\n",
821 instance->irq);
822 goto fail_irq;
823 }
824 tt_mfp.active_edge |= 0x80; /* SCSI int on L->H */
Finn Thaine4dec682016-03-23 21:10:12 +1100825
Finn Thain3ff228a2014-11-12 16:12:09 +1100826 tt_scsi_dma.dma_ctrl = 0;
827 atari_dma_residual = 0;
828
829 /* While the read overruns (described by Drew Eckhardt in
830 * NCR5380.c) never happened on TTs, they do in fact on the
831 * Medusa (This was the cause why SCSI didn't work right for
832 * so long there.) Since handling the overruns slows down
833 * a bit, I turned the #ifdef's into a runtime condition.
834 *
835 * In principle it should be sufficient to do max. 1 byte with
836 * PIO, but there is another problem on the Medusa with the DMA
Finn Thainef1081c2014-11-12 16:12:14 +1100837 * rest data register. So read_overruns is currently set
Finn Thain3ff228a2014-11-12 16:12:09 +1100838 * to 4 to avoid having transfers that aren't a multiple of 4.
839 * If the rest data bug is fixed, this can be lowered to 1.
840 */
Finn Thainef1081c2014-11-12 16:12:14 +1100841 if (MACH_IS_MEDUSA) {
842 struct NCR5380_hostdata *hostdata =
843 shost_priv(instance);
844
845 hostdata->read_overruns = 4;
846 }
Finn Thain3ff228a2014-11-12 16:12:09 +1100847 } else {
848 /* Nothing to do for the interrupt: the ST-DMA is initialized
849 * already.
850 */
Finn Thain3ff228a2014-11-12 16:12:09 +1100851 atari_dma_residual = 0;
852 atari_dma_active = 0;
853 atari_dma_stram_mask = (ATARIHW_PRESENT(EXTD_DMA) ? 0x00000000
854 : 0xff000000);
Finn Thain3ff228a2014-11-12 16:12:09 +1100855 }
856
Finn Thain9c3f0e22016-01-03 16:05:11 +1100857 NCR5380_maybe_reset_bus(instance);
858
Finn Thain3ff228a2014-11-12 16:12:09 +1100859 error = scsi_add_host(instance, NULL);
860 if (error)
861 goto fail_host;
862
863 platform_set_drvdata(pdev, instance);
864
865 scsi_scan_host(instance);
866 return 0;
867
868fail_host:
869 if (IS_A_TT())
870 free_irq(instance->irq, instance);
871fail_irq:
872 NCR5380_exit(instance);
Finn Thain0ad0eff2016-01-03 16:05:21 +1100873fail_init:
Finn Thain3ff228a2014-11-12 16:12:09 +1100874 scsi_host_put(instance);
875fail_alloc:
876 if (atari_dma_buffer)
877 atari_stram_free(atari_dma_buffer);
878 return error;
879}
880
881static int __exit atari_scsi_remove(struct platform_device *pdev)
882{
883 struct Scsi_Host *instance = platform_get_drvdata(pdev);
884
885 scsi_remove_host(instance);
886 if (IS_A_TT())
887 free_irq(instance->irq, instance);
888 NCR5380_exit(instance);
889 scsi_host_put(instance);
890 if (atari_dma_buffer)
891 atari_stram_free(atari_dma_buffer);
892 return 0;
893}
894
895static struct platform_driver atari_scsi_driver = {
896 .remove = __exit_p(atari_scsi_remove),
897 .driver = {
898 .name = DRV_MODULE_NAME,
Finn Thain3ff228a2014-11-12 16:12:09 +1100899 },
900};
901
902module_platform_driver_probe(atari_scsi_driver, atari_scsi_probe);
903
904MODULE_ALIAS("platform:" DRV_MODULE_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905MODULE_LICENSE("GPL");