blob: 3725f088f17e22f65b6eebf4403c49a086004716 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Device driver for the via ADB on (many) Mac II-class machines
3 *
4 * Based on the original ADB keyboard handler Copyright (c) 1997 Alan Cox
5 * Also derived from code Copyright (C) 1996 Paul Mackerras.
6 *
7 * With various updates provided over the years by Michael Schmitz,
8 * Guideo Koerber and others.
9 *
10 * Rewrite for Unified ADB by Joshua M. Thompson (funaho@jurai.org)
11 *
12 * 1999-08-02 (jmt) - Initial rewrite for Unified ADB.
13 * 2000-03-29 Tony Mantler <tonym@mac.linux-m68k.org>
14 * - Big overhaul, should actually work now.
Finn Thaind95fd5f2007-05-01 22:32:59 +020015 * 2006-12-31 Finn Thain <fthain@telegraphics.com.au> - Another overhaul.
16 *
17 * Suggested reading:
18 * Inside Macintosh, ch. 5 ADB Manager
19 * Guide to the Macinstosh Family Hardware, ch. 8 Apple Desktop Bus
20 * Rockwell R6522 VIA datasheet
21 *
22 * Apple's "ADB Analyzer" bus sniffer is invaluable:
23 * ftp://ftp.apple.com/developer/Tool_Chest/Devices_-_Hardware/Apple_Desktop_Bus/
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
25
26#include <stdarg.h>
27#include <linux/types.h>
28#include <linux/errno.h>
29#include <linux/kernel.h>
30#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/adb.h>
32#include <linux/interrupt.h>
33#include <linux/init.h>
34#include <asm/macintosh.h>
35#include <asm/macints.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/mac_via.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38static volatile unsigned char *via;
39
40/* VIA registers - spaced 0x200 bytes apart */
41#define RS 0x200 /* skip between registers */
42#define B 0 /* B-side data */
43#define A RS /* A-side data */
44#define DIRB (2*RS) /* B-side direction (1=output) */
45#define DIRA (3*RS) /* A-side direction (1=output) */
46#define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */
47#define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */
48#define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */
49#define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */
50#define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */
51#define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */
52#define SR (10*RS) /* Shift register */
53#define ACR (11*RS) /* Auxiliary control register */
54#define PCR (12*RS) /* Peripheral control register */
55#define IFR (13*RS) /* Interrupt flag register */
56#define IER (14*RS) /* Interrupt enable register */
57#define ANH (15*RS) /* A-side data, no handshake */
58
59/* Bits in B data register: all active low */
Finn Thaind95fd5f2007-05-01 22:32:59 +020060#define CTLR_IRQ 0x08 /* Controller rcv status (input) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#define ST_MASK 0x30 /* mask for selecting ADB state bits */
62
63/* Bits in ACR */
64#define SR_CTRL 0x1c /* Shift register control bits */
65#define SR_EXT 0x0c /* Shift on external clock */
66#define SR_OUT 0x10 /* Shift out if 1 */
67
68/* Bits in IFR and IER */
69#define IER_SET 0x80 /* set bits in IER */
70#define IER_CLR 0 /* clear bits in IER */
71#define SR_INT 0x04 /* Shift register full/empty */
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73/* ADB transaction states according to GMHW */
74#define ST_CMD 0x00 /* ADB state: command byte */
75#define ST_EVEN 0x10 /* ADB state: even data byte */
76#define ST_ODD 0x20 /* ADB state: odd data byte */
77#define ST_IDLE 0x30 /* ADB state: idle, nothing to send */
78
79static int macii_init_via(void);
80static void macii_start(void);
David Howells7d12e782006-10-05 14:55:46 +010081static irqreturn_t macii_interrupt(int irq, void *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082static void macii_queue_poll(void);
83
84static int macii_probe(void);
85static int macii_init(void);
86static int macii_send_request(struct adb_request *req, int sync);
87static int macii_write(struct adb_request *req);
88static int macii_autopoll(int devs);
89static void macii_poll(void);
90static int macii_reset_bus(void);
91
92struct adb_driver via_macii_driver = {
93 "Mac II",
94 macii_probe,
95 macii_init,
96 macii_send_request,
97 macii_autopoll,
98 macii_poll,
99 macii_reset_bus
100};
101
102static enum macii_state {
103 idle,
104 sending,
105 reading,
106 read_done,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107} macii_state;
108
Finn Thaind95fd5f2007-05-01 22:32:59 +0200109static struct adb_request *current_req; /* first request struct in the queue */
110static struct adb_request *last_req; /* last request struct in the queue */
111static unsigned char reply_buf[16]; /* storage for autopolled replies */
Finn Thaineb4da4c2008-02-04 22:30:27 -0800112static unsigned char *reply_ptr; /* next byte in reply_buf or req->reply */
Finn Thaind95fd5f2007-05-01 22:32:59 +0200113static int reading_reply; /* store reply in reply_buf else req->reply */
114static int data_index; /* index of the next byte to send from req->data */
115static int reply_len; /* number of bytes received in reply_buf or req->reply */
116static int status; /* VIA's ADB status bits captured upon interrupt */
117static int last_status; /* status bits as at previous interrupt */
118static int srq_asserted; /* have to poll for the device that asserted it */
119static int command_byte; /* the most recent command byte transmitted */
120static int autopoll_devs; /* bits set are device addresses to be polled */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Finn Thaind95fd5f2007-05-01 22:32:59 +0200122/* Sanity check for request queue. Doesn't check for cycles. */
123static int request_is_queued(struct adb_request *req) {
124 struct adb_request *cur;
125 unsigned long flags;
126 local_irq_save(flags);
127 cur = current_req;
128 while (cur) {
129 if (cur == req) {
130 local_irq_restore(flags);
131 return 1;
132 }
133 cur = cur->next;
134 }
135 local_irq_restore(flags);
136 return 0;
137}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139/* Check for MacII style ADB */
140static int macii_probe(void)
141{
142 if (macintosh_config->adb_type != MAC_ADB_II) return -ENODEV;
143
144 via = via1;
145
146 printk("adb: Mac II ADB Driver v1.0 for Unified ADB\n");
147 return 0;
148}
149
150/* Initialize the driver */
151int macii_init(void)
152{
153 unsigned long flags;
154 int err;
155
156 local_irq_save(flags);
157
158 err = macii_init_via();
Finn Thaind95fd5f2007-05-01 22:32:59 +0200159 if (err) goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Geert Uytterhoeven5a239452011-07-13 22:33:13 +0200161 err = request_irq(IRQ_MAC_ADB, macii_interrupt, 0, "ADB",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 macii_interrupt);
Finn Thaind95fd5f2007-05-01 22:32:59 +0200163 if (err) goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 macii_state = idle;
Finn Thaind95fd5f2007-05-01 22:32:59 +0200166out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 local_irq_restore(flags);
Finn Thaind95fd5f2007-05-01 22:32:59 +0200168 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
170
171/* initialize the hardware */
172static int macii_init_via(void)
173{
174 unsigned char x;
175
Finn Thaind95fd5f2007-05-01 22:32:59 +0200176 /* We want CTLR_IRQ as input and ST_EVEN | ST_ODD as output lines. */
177 via[DIRB] = (via[DIRB] | ST_EVEN | ST_ODD) & ~CTLR_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 /* Set up state: idle */
180 via[B] |= ST_IDLE;
Finn Thaind95fd5f2007-05-01 22:32:59 +0200181 last_status = via[B] & (ST_MASK|CTLR_IRQ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
183 /* Shift register on input */
184 via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT;
185
186 /* Wipe any pending data and int */
187 x = via[SR];
188
189 return 0;
190}
191
Finn Thaind95fd5f2007-05-01 22:32:59 +0200192/* Send an ADB poll (Talk Register 0 command prepended to the request queue) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193static void macii_queue_poll(void)
194{
Finn Thaind95fd5f2007-05-01 22:32:59 +0200195 /* No point polling the active device as it will never assert SRQ, so
196 * poll the next device in the autopoll list. This could leave us
197 * stuck in a polling loop if an unprobed device is asserting SRQ.
198 * In theory, that could only happen if a device was plugged in after
199 * probing started. Unplugging it again will break the cycle.
200 * (Simply polling the next higher device often ends up polling almost
201 * every device (after wrapping around), which takes too long.)
202 */
203 int device_mask;
204 int next_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 static struct adb_request req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Finn Thaind95fd5f2007-05-01 22:32:59 +0200207 if (!autopoll_devs) return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Finn Thaind95fd5f2007-05-01 22:32:59 +0200209 device_mask = (1 << (((command_byte & 0xF0) >> 4) + 1)) - 1;
210 if (autopoll_devs & ~device_mask)
211 next_device = ffs(autopoll_devs & ~device_mask) - 1;
212 else
213 next_device = ffs(autopoll_devs) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Finn Thaind95fd5f2007-05-01 22:32:59 +0200215 BUG_ON(request_is_queued(&req));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
Finn Thaind95fd5f2007-05-01 22:32:59 +0200217 adb_request(&req, NULL, ADBREQ_NOSEND, 1,
218 ADB_READREG(next_device, 0));
219
220 req.sent = 0;
221 req.complete = 0;
222 req.reply_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 req.next = current_req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 if (current_req != NULL) {
Finn Thaind95fd5f2007-05-01 22:32:59 +0200226 current_req = &req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 } else {
Finn Thaind95fd5f2007-05-01 22:32:59 +0200228 current_req = &req;
229 last_req = &req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231}
232
233/* Send an ADB request; if sync, poll out the reply 'till it's done */
234static int macii_send_request(struct adb_request *req, int sync)
235{
Finn Thaind95fd5f2007-05-01 22:32:59 +0200236 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 unsigned long flags;
238
Finn Thaind95fd5f2007-05-01 22:32:59 +0200239 BUG_ON(request_is_queued(req));
240
241 local_irq_save(flags);
242 err = macii_write(req);
243 local_irq_restore(flags);
244
245 if (!err && sync) {
246 while (!req->complete) {
247 macii_poll();
248 }
249 BUG_ON(request_is_queued(req));
250 }
251
252 return err;
253}
254
255/* Send an ADB request (append to request queue) */
256static int macii_write(struct adb_request *req)
257{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 if (req->nbytes < 2 || req->data[0] != ADB_PACKET || req->nbytes > 15) {
259 req->complete = 1;
260 return -EINVAL;
261 }
262
Al Viroa5d361f2006-01-12 01:06:34 -0800263 req->next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 req->sent = 0;
265 req->complete = 0;
266 req->reply_len = 0;
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 if (current_req != NULL) {
269 last_req->next = req;
270 last_req = req;
271 } else {
272 current_req = req;
273 last_req = req;
274 if (macii_state == idle) macii_start();
275 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return 0;
277}
278
279/* Start auto-polling */
280static int macii_autopoll(int devs)
281{
Finn Thaind95fd5f2007-05-01 22:32:59 +0200282 static struct adb_request req;
283 unsigned long flags;
284 int err = 0;
285
286 /* bit 1 == device 1, and so on. */
287 autopoll_devs = devs & 0xFFFE;
288
289 if (!autopoll_devs) return 0;
290
291 local_irq_save(flags);
292
293 if (current_req == NULL) {
294 /* Send a Talk Reg 0. The controller will repeatedly transmit
295 * this as long as it is idle.
296 */
297 adb_request(&req, NULL, ADBREQ_NOSEND, 1,
298 ADB_READREG(ffs(autopoll_devs) - 1, 0));
299 err = macii_write(&req);
300 }
301
302 local_irq_restore(flags);
303 return err;
304}
305
306static inline int need_autopoll(void) {
307 /* Was the last command Talk Reg 0
308 * and is the target on the autopoll list?
309 */
310 if ((command_byte & 0x0F) == 0x0C &&
311 ((1 << ((command_byte & 0xF0) >> 4)) & autopoll_devs))
312 return 0;
313 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
316/* Prod the chip without interrupts */
317static void macii_poll(void)
318{
Finn Thaind95fd5f2007-05-01 22:32:59 +0200319 disable_irq(IRQ_MAC_ADB);
320 macii_interrupt(0, NULL);
321 enable_irq(IRQ_MAC_ADB);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322}
323
324/* Reset the bus */
325static int macii_reset_bus(void)
326{
327 static struct adb_request req;
328
Finn Thaind95fd5f2007-05-01 22:32:59 +0200329 if (request_is_queued(&req))
330 return 0;
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 /* Command = 0, Address = ignored */
333 adb_request(&req, NULL, 0, 1, ADB_BUSRESET);
334
Finn Thaind95fd5f2007-05-01 22:32:59 +0200335 /* Don't want any more requests during the Global Reset low time. */
336 udelay(3000);
337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 return 0;
339}
340
341/* Start sending ADB packet */
342static void macii_start(void)
343{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 struct adb_request *req;
345
346 req = current_req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
Finn Thaind95fd5f2007-05-01 22:32:59 +0200348 BUG_ON(req == NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Finn Thaind95fd5f2007-05-01 22:32:59 +0200350 BUG_ON(macii_state != idle);
351
352 /* Now send it. Be careful though, that first byte of the request
353 * is actually ADB_PACKET; the real data begins at index 1!
354 * And req->nbytes is the number of bytes of real data plus one.
355 */
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 /* store command byte */
358 command_byte = req->data[1];
359 /* Output mode */
360 via[ACR] |= SR_OUT;
361 /* Load data */
362 via[SR] = req->data[1];
363 /* set ADB state to 'command' */
364 via[B] = (via[B] & ~ST_MASK) | ST_CMD;
365
366 macii_state = sending;
367 data_index = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368}
369
370/*
Finn Thaind95fd5f2007-05-01 22:32:59 +0200371 * The notorious ADB interrupt handler - does all of the protocol handling.
372 * Relies on the ADB controller sending and receiving data, thereby
373 * generating shift register interrupts (SR_INT) for us. This means there has
374 * to be activity on the ADB bus. The chip will poll to achieve this.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 *
376 * The basic ADB state machine was left unchanged from the original MacII code
377 * by Alan Cox, which was based on the CUDA driver for PowerMac.
Finn Thaind95fd5f2007-05-01 22:32:59 +0200378 * The syntax of the ADB status lines is totally different on MacII,
379 * though. MacII uses the states Command -> Even -> Odd -> Even ->...-> Idle
380 * for sending and Idle -> Even -> Odd -> Even ->...-> Idle for receiving.
381 * Start and end of a receive packet are signalled by asserting /IRQ on the
382 * interrupt line (/IRQ means the CTLR_IRQ bit in port B; not to be confused
383 * with the VIA shift register interrupt. /IRQ never actually interrupts the
384 * processor, it's just an ordinary input.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 */
David Howells7d12e782006-10-05 14:55:46 +0100386static irqreturn_t macii_interrupt(int irq, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Finn Thaind95fd5f2007-05-01 22:32:59 +0200388 int x;
389 static int entered;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 struct adb_request *req;
391
Finn Thaind95fd5f2007-05-01 22:32:59 +0200392 if (!arg) {
393 /* Clear the SR IRQ flag when polling. */
394 if (via[IFR] & SR_INT)
395 via[IFR] = SR_INT;
396 else
397 return IRQ_NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 }
399
Finn Thaind95fd5f2007-05-01 22:32:59 +0200400 BUG_ON(entered++);
401
402 last_status = status;
403 status = via[B] & (ST_MASK|CTLR_IRQ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405 switch (macii_state) {
406 case idle:
Finn Thaind95fd5f2007-05-01 22:32:59 +0200407 if (reading_reply) {
408 reply_ptr = current_req->reply;
409 } else {
410 BUG_ON(current_req != NULL);
411 reply_ptr = reply_buf;
412 }
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 x = via[SR];
Finn Thaind95fd5f2007-05-01 22:32:59 +0200415
416 if ((status & CTLR_IRQ) && (x == 0xFF)) {
417 /* Bus timeout without SRQ sequence:
418 * data is "FF" while CTLR_IRQ is "H"
419 */
420 reply_len = 0;
421 srq_asserted = 0;
422 macii_state = read_done;
423 } else {
424 macii_state = reading;
425 *reply_ptr = x;
426 reply_len = 1;
427 }
428
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 /* set ADB state = even for first data byte */
430 via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 break;
432
433 case sending:
434 req = current_req;
435 if (data_index >= req->nbytes) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 req->sent = 1;
Finn Thaind95fd5f2007-05-01 22:32:59 +0200437 macii_state = idle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 if (req->reply_expected) {
Finn Thaind95fd5f2007-05-01 22:32:59 +0200440 reading_reply = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 } else {
442 req->complete = 1;
443 current_req = req->next;
444 if (req->done) (*req->done)(req);
Finn Thaind95fd5f2007-05-01 22:32:59 +0200445
446 if (current_req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 macii_start();
448 else
Finn Thaind95fd5f2007-05-01 22:32:59 +0200449 if (need_autopoll())
450 macii_autopoll(autopoll_devs);
451 }
452
453 if (macii_state == idle) {
454 /* reset to shift in */
455 via[ACR] &= ~SR_OUT;
456 x = via[SR];
457 /* set ADB state idle - might get SRQ */
458 via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460 } else {
461 via[SR] = req->data[data_index++];
462
463 if ( (via[B] & ST_MASK) == ST_CMD ) {
464 /* just sent the command byte, set to EVEN */
465 via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
466 } else {
467 /* invert state bits, toggle ODD/EVEN */
468 via[B] ^= ST_MASK;
469 }
470 }
471 break;
472
473 case reading:
Finn Thaind95fd5f2007-05-01 22:32:59 +0200474 x = via[SR];
475 BUG_ON((status & ST_MASK) == ST_CMD ||
476 (status & ST_MASK) == ST_IDLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Finn Thaind95fd5f2007-05-01 22:32:59 +0200478 /* Bus timeout with SRQ sequence:
479 * data is "XX FF" while CTLR_IRQ is "L L"
480 * End of packet without SRQ sequence:
481 * data is "XX...YY 00" while CTLR_IRQ is "L...H L"
482 * End of packet SRQ sequence:
483 * data is "XX...YY 00" while CTLR_IRQ is "L...L L"
484 * (where XX is the first response byte and
485 * YY is the last byte of valid response data.)
486 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
Finn Thaind95fd5f2007-05-01 22:32:59 +0200488 srq_asserted = 0;
489 if (!(status & CTLR_IRQ)) {
490 if (x == 0xFF) {
491 if (!(last_status & CTLR_IRQ)) {
492 macii_state = read_done;
493 reply_len = 0;
494 srq_asserted = 1;
495 }
496 } else if (x == 0x00) {
497 macii_state = read_done;
498 if (!(last_status & CTLR_IRQ))
499 srq_asserted = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
Finn Thaind95fd5f2007-05-01 22:32:59 +0200501 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
Finn Thaind95fd5f2007-05-01 22:32:59 +0200503 if (macii_state == reading) {
504 BUG_ON(reply_len > 15);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 reply_ptr++;
Finn Thaind95fd5f2007-05-01 22:32:59 +0200506 *reply_ptr = x;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 reply_len++;
508 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
Finn Thaind95fd5f2007-05-01 22:32:59 +0200510 /* invert state bits, toggle ODD/EVEN */
511 via[B] ^= ST_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 break;
513
514 case read_done:
515 x = via[SR];
Finn Thaind95fd5f2007-05-01 22:32:59 +0200516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 if (reading_reply) {
Finn Thaind95fd5f2007-05-01 22:32:59 +0200518 reading_reply = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 req = current_req;
Finn Thaind95fd5f2007-05-01 22:32:59 +0200520 req->reply_len = reply_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 req->complete = 1;
522 current_req = req->next;
523 if (req->done) (*req->done)(req);
Finn Thaind95fd5f2007-05-01 22:32:59 +0200524 } else if (reply_len && autopoll_devs)
525 adb_input(reply_buf, reply_len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
Finn Thaind95fd5f2007-05-01 22:32:59 +0200527 macii_state = idle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 /* SRQ seen before, initiate poll now */
Finn Thaind95fd5f2007-05-01 22:32:59 +0200530 if (srq_asserted)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 macii_queue_poll();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Finn Thaind95fd5f2007-05-01 22:32:59 +0200533 if (current_req)
534 macii_start();
535 else
536 if (need_autopoll())
537 macii_autopoll(autopoll_devs);
538
539 if (macii_state == idle)
540 via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 break;
542
543 default:
544 break;
545 }
Finn Thaind95fd5f2007-05-01 22:32:59 +0200546
547 entered--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return IRQ_HANDLED;
549}