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[PATCH] PCI: disable msi mode in pci_disable_device
[linux-2.6/mini2440.git] / drivers / pci / hotplug / ibmphp_hpc.c
blobc3ac98a0a6a608b94cfdae4bc2baa1bfd37db881
1 /*
2 * IBM Hot Plug Controller Driver
3 *
4 * Written By: Jyoti Shah, IBM Corporation
5 *
6 * Copyright (C) 2001-2003 IBM Corp.
7 *
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT. See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * Send feedback to <gregkh@us.ibm.com>
26 * <jshah@us.ibm.com>
27 *
28 */
29
30 #include <linux/wait.h>
31 #include <linux/time.h>
32 #include <linux/delay.h>
33 #include <linux/module.h>
34 #include <linux/pci.h>
35 #include <linux/smp_lock.h>
36 #include <linux/init.h>
37 #include <linux/mutex.h>
38
39 #include "ibmphp.h"
40
41 static int to_debug = 0;
42 #define debug_polling(fmt, arg...) do { if (to_debug) debug (fmt, arg); } while (0)
43
44 //----------------------------------------------------------------------------
45 // timeout values
46 //----------------------------------------------------------------------------
47 #define CMD_COMPLETE_TOUT_SEC 60 // give HPC 60 sec to finish cmd
48 #define HPC_CTLR_WORKING_TOUT 60 // give HPC 60 sec to finish cmd
49 #define HPC_GETACCESS_TIMEOUT 60 // seconds
50 #define POLL_INTERVAL_SEC 2 // poll HPC every 2 seconds
51 #define POLL_LATCH_CNT 5 // poll latch 5 times, then poll slots
52
53 //----------------------------------------------------------------------------
54 // Winnipeg Architected Register Offsets
55 //----------------------------------------------------------------------------
56 #define WPG_I2CMBUFL_OFFSET 0x08 // I2C Message Buffer Low
57 #define WPG_I2CMOSUP_OFFSET 0x10 // I2C Master Operation Setup Reg
58 #define WPG_I2CMCNTL_OFFSET 0x20 // I2C Master Control Register
59 #define WPG_I2CPARM_OFFSET 0x40 // I2C Parameter Register
60 #define WPG_I2CSTAT_OFFSET 0x70 // I2C Status Register
61
62 //----------------------------------------------------------------------------
63 // Winnipeg Store Type commands (Add this commands to the register offset)
64 //----------------------------------------------------------------------------
65 #define WPG_I2C_AND 0x1000 // I2C AND operation
66 #define WPG_I2C_OR 0x2000 // I2C OR operation
67
68 //----------------------------------------------------------------------------
69 // Command set for I2C Master Operation Setup Register
70 //----------------------------------------------------------------------------
71 #define WPG_READATADDR_MASK 0x00010000 // read,bytes,I2C shifted,index
72 #define WPG_WRITEATADDR_MASK 0x40010000 // write,bytes,I2C shifted,index
73 #define WPG_READDIRECT_MASK 0x10010000
74 #define WPG_WRITEDIRECT_MASK 0x60010000
75
76
77 //----------------------------------------------------------------------------
78 // bit masks for I2C Master Control Register
79 //----------------------------------------------------------------------------
80 #define WPG_I2CMCNTL_STARTOP_MASK 0x00000002 // Start the Operation
81
82 //----------------------------------------------------------------------------
83 //
84 //----------------------------------------------------------------------------
85 #define WPG_I2C_IOREMAP_SIZE 0x2044 // size of linear address interval
86
87 //----------------------------------------------------------------------------
88 // command index
89 //----------------------------------------------------------------------------
90 #define WPG_1ST_SLOT_INDEX 0x01 // index - 1st slot for ctlr
91 #define WPG_CTLR_INDEX 0x0F // index - ctlr
92 #define WPG_1ST_EXTSLOT_INDEX 0x10 // index - 1st ext slot for ctlr
93 #define WPG_1ST_BUS_INDEX 0x1F // index - 1st bus for ctlr
94
95 //----------------------------------------------------------------------------
96 // macro utilities
97 //----------------------------------------------------------------------------
98 // if bits 20,22,25,26,27,29,30 are OFF return 1
99 #define HPC_I2CSTATUS_CHECK(s) ((u8)((s & 0x00000A76) ? 0 : 1))
100
101 //----------------------------------------------------------------------------
102 // global variables
103 //----------------------------------------------------------------------------
104 static int ibmphp_shutdown;
105 static int tid_poll;
106 static struct mutex sem_hpcaccess; // lock access to HPC
107 static struct semaphore semOperations; // lock all operations and
108 // access to data structures
109 static struct semaphore sem_exit; // make sure polling thread goes away
110 //----------------------------------------------------------------------------
111 // local function prototypes
112 //----------------------------------------------------------------------------
113 static u8 i2c_ctrl_read (struct controller *, void __iomem *, u8);
114 static u8 i2c_ctrl_write (struct controller *, void __iomem *, u8, u8);
115 static u8 hpc_writecmdtoindex (u8, u8);
116 static u8 hpc_readcmdtoindex (u8, u8);
117 static void get_hpc_access (void);
118 static void free_hpc_access (void);
119 static void poll_hpc (void);
120 static int process_changeinstatus (struct slot *, struct slot *);
121 static int process_changeinlatch (u8, u8, struct controller *);
122 static int hpc_poll_thread (void *);
123 static int hpc_wait_ctlr_notworking (int, struct controller *, void __iomem *, u8 *);
124 //----------------------------------------------------------------------------
125
126
127 /*----------------------------------------------------------------------
128 * Name: ibmphp_hpc_initvars
129 *
130 * Action: initialize semaphores and variables
131 *---------------------------------------------------------------------*/
132 void __init ibmphp_hpc_initvars (void)
133 {
134 debug ("%s - Entry\n", __FUNCTION__);
135
136 mutex_init(&sem_hpcaccess);
137 init_MUTEX (&semOperations);
138 init_MUTEX_LOCKED (&sem_exit);
139 to_debug = 0;
140 ibmphp_shutdown = 0;
141 tid_poll = 0;
142
143 debug ("%s - Exit\n", __FUNCTION__);
144 }
145
146 /*----------------------------------------------------------------------
147 * Name: i2c_ctrl_read
148 *
149 * Action: read from HPC over I2C
150 *
151 *---------------------------------------------------------------------*/
152 static u8 i2c_ctrl_read (struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index)
153 {
154 u8 status;
155 int i;
156 void __iomem *wpg_addr; // base addr + offset
157 unsigned long wpg_data; // data to/from WPG LOHI format
158 unsigned long ultemp;
159 unsigned long data; // actual data HILO format
160
161 debug_polling ("%s - Entry WPGBbar[%p] index[%x] \n", __FUNCTION__, WPGBbar, index);
162
163 //--------------------------------------------------------------------
164 // READ - step 1
165 // read at address, byte length, I2C address (shifted), index
166 // or read direct, byte length, index
167 if (ctlr_ptr->ctlr_type == 0x02) {
168 data = WPG_READATADDR_MASK;
169 // fill in I2C address
170 ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr;
171 ultemp = ultemp >> 1;
172 data |= (ultemp << 8);
173
174 // fill in index
175 data |= (unsigned long)index;
176 } else if (ctlr_ptr->ctlr_type == 0x04) {
177 data = WPG_READDIRECT_MASK;
178
179 // fill in index
180 ultemp = (unsigned long)index;
181 ultemp = ultemp << 8;
182 data |= ultemp;
183 } else {
184 err ("this controller type is not supported \n");
185 return HPC_ERROR;
186 }
187
188 wpg_data = swab32 (data); // swap data before writing
189 wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET;
190 writel (wpg_data, wpg_addr);
191
192 //--------------------------------------------------------------------
193 // READ - step 2 : clear the message buffer
194 data = 0x00000000;
195 wpg_data = swab32 (data);
196 wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
197 writel (wpg_data, wpg_addr);
198
199 //--------------------------------------------------------------------
200 // READ - step 3 : issue start operation, I2C master control bit 30:ON
201 // 2020 : [20] OR operation at [20] offset 0x20
202 data = WPG_I2CMCNTL_STARTOP_MASK;
203 wpg_data = swab32 (data);
204 wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR;
205 writel (wpg_data, wpg_addr);
206
207 //--------------------------------------------------------------------
208 // READ - step 4 : wait until start operation bit clears
209 i = CMD_COMPLETE_TOUT_SEC;
210 while (i) {
211 msleep(10);
212 wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET;
213 wpg_data = readl (wpg_addr);
214 data = swab32 (wpg_data);
215 if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
216 break;
217 i--;
218 }
219 if (i == 0) {
220 debug ("%s - Error : WPG timeout\n", __FUNCTION__);
221 return HPC_ERROR;
222 }
223 //--------------------------------------------------------------------
224 // READ - step 5 : read I2C status register
225 i = CMD_COMPLETE_TOUT_SEC;
226 while (i) {
227 msleep(10);
228 wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET;
229 wpg_data = readl (wpg_addr);
230 data = swab32 (wpg_data);
231 if (HPC_I2CSTATUS_CHECK (data))
232 break;
233 i--;
234 }
235 if (i == 0) {
236 debug ("ctrl_read - Exit Error:I2C timeout\n");
237 return HPC_ERROR;
238 }
239
240 //--------------------------------------------------------------------
241 // READ - step 6 : get DATA
242 wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
243 wpg_data = readl (wpg_addr);
244 data = swab32 (wpg_data);
245
246 status = (u8) data;
247
248 debug_polling ("%s - Exit index[%x] status[%x]\n", __FUNCTION__, index, status);
249
250 return (status);
251 }
252
253 /*----------------------------------------------------------------------
254 * Name: i2c_ctrl_write
255 *
256 * Action: write to HPC over I2C
257 *
258 * Return 0 or error codes
259 *---------------------------------------------------------------------*/
260 static u8 i2c_ctrl_write (struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index, u8 cmd)
261 {
262 u8 rc;
263 void __iomem *wpg_addr; // base addr + offset
264 unsigned long wpg_data; // data to/from WPG LOHI format
265 unsigned long ultemp;
266 unsigned long data; // actual data HILO format
267 int i;
268
269 debug_polling ("%s - Entry WPGBbar[%p] index[%x] cmd[%x]\n", __FUNCTION__, WPGBbar, index, cmd);
270
271 rc = 0;
272 //--------------------------------------------------------------------
273 // WRITE - step 1
274 // write at address, byte length, I2C address (shifted), index
275 // or write direct, byte length, index
276 data = 0x00000000;
277
278 if (ctlr_ptr->ctlr_type == 0x02) {
279 data = WPG_WRITEATADDR_MASK;
280 // fill in I2C address
281 ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr;
282 ultemp = ultemp >> 1;
283 data |= (ultemp << 8);
284
285 // fill in index
286 data |= (unsigned long)index;
287 } else if (ctlr_ptr->ctlr_type == 0x04) {
288 data = WPG_WRITEDIRECT_MASK;
289
290 // fill in index
291 ultemp = (unsigned long)index;
292 ultemp = ultemp << 8;
293 data |= ultemp;
294 } else {
295 err ("this controller type is not supported \n");
296 return HPC_ERROR;
297 }
298
299 wpg_data = swab32 (data); // swap data before writing
300 wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET;
301 writel (wpg_data, wpg_addr);
302
303 //--------------------------------------------------------------------
304 // WRITE - step 2 : clear the message buffer
305 data = 0x00000000 | (unsigned long)cmd;
306 wpg_data = swab32 (data);
307 wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
308 writel (wpg_data, wpg_addr);
309
310 //--------------------------------------------------------------------
311 // WRITE - step 3 : issue start operation,I2C master control bit 30:ON
312 // 2020 : [20] OR operation at [20] offset 0x20
313 data = WPG_I2CMCNTL_STARTOP_MASK;
314 wpg_data = swab32 (data);
315 wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR;
316 writel (wpg_data, wpg_addr);
317
318 //--------------------------------------------------------------------
319 // WRITE - step 4 : wait until start operation bit clears
320 i = CMD_COMPLETE_TOUT_SEC;
321 while (i) {
322 msleep(10);
323 wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET;
324 wpg_data = readl (wpg_addr);
325 data = swab32 (wpg_data);
326 if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
327 break;
328 i--;
329 }
330 if (i == 0) {
331 debug ("%s - Exit Error:WPG timeout\n", __FUNCTION__);
332 rc = HPC_ERROR;
333 }
334
335 //--------------------------------------------------------------------
336 // WRITE - step 5 : read I2C status register
337 i = CMD_COMPLETE_TOUT_SEC;
338 while (i) {
339 msleep(10);
340 wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET;
341 wpg_data = readl (wpg_addr);
342 data = swab32 (wpg_data);
343 if (HPC_I2CSTATUS_CHECK (data))
344 break;
345 i--;
346 }
347 if (i == 0) {
348 debug ("ctrl_read - Error : I2C timeout\n");
349 rc = HPC_ERROR;
350 }
351
352 debug_polling ("%s Exit rc[%x]\n", __FUNCTION__, rc);
353 return (rc);
354 }
355
356 //------------------------------------------------------------
357 // Read from ISA type HPC
358 //------------------------------------------------------------
359 static u8 isa_ctrl_read (struct controller *ctlr_ptr, u8 offset)
360 {
361 u16 start_address;
362 u16 end_address;
363 u8 data;
364
365 start_address = ctlr_ptr->u.isa_ctlr.io_start;
366 end_address = ctlr_ptr->u.isa_ctlr.io_end;
367 data = inb (start_address + offset);
368 return data;
369 }
370
371 //--------------------------------------------------------------
372 // Write to ISA type HPC
373 //--------------------------------------------------------------
374 static void isa_ctrl_write (struct controller *ctlr_ptr, u8 offset, u8 data)
375 {
376 u16 start_address;
377 u16 port_address;
378
379 start_address = ctlr_ptr->u.isa_ctlr.io_start;
380 port_address = start_address + (u16) offset;
381 outb (data, port_address);
382 }
383
384 static u8 pci_ctrl_read (struct controller *ctrl, u8 offset)
385 {
386 u8 data = 0x00;
387 debug ("inside pci_ctrl_read\n");
388 if (ctrl->ctrl_dev)
389 pci_read_config_byte (ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, &data);
390 return data;
391 }
392
393 static u8 pci_ctrl_write (struct controller *ctrl, u8 offset, u8 data)
394 {
395 u8 rc = -ENODEV;
396 debug ("inside pci_ctrl_write\n");
397 if (ctrl->ctrl_dev) {
398 pci_write_config_byte (ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, data);
399 rc = 0;
400 }
401 return rc;
402 }
403
404 static u8 ctrl_read (struct controller *ctlr, void __iomem *base, u8 offset)
405 {
406 u8 rc;
407 switch (ctlr->ctlr_type) {
408 case 0:
409 rc = isa_ctrl_read (ctlr, offset);
410 break;
411 case 1:
412 rc = pci_ctrl_read (ctlr, offset);
413 break;
414 case 2:
415 case 4:
416 rc = i2c_ctrl_read (ctlr, base, offset);
417 break;
418 default:
419 return -ENODEV;
420 }
421 return rc;
422 }
423
424 static u8 ctrl_write (struct controller *ctlr, void __iomem *base, u8 offset, u8 data)
425 {
426 u8 rc = 0;
427 switch (ctlr->ctlr_type) {
428 case 0:
429 isa_ctrl_write(ctlr, offset, data);
430 break;
431 case 1:
432 rc = pci_ctrl_write (ctlr, offset, data);
433 break;
434 case 2:
435 case 4:
436 rc = i2c_ctrl_write(ctlr, base, offset, data);
437 break;
438 default:
439 return -ENODEV;
440 }
441 return rc;
442 }
443 /*----------------------------------------------------------------------
444 * Name: hpc_writecmdtoindex()
445 *
446 * Action: convert a write command to proper index within a controller
447 *
448 * Return index, HPC_ERROR
449 *---------------------------------------------------------------------*/
450 static u8 hpc_writecmdtoindex (u8 cmd, u8 index)
451 {
452 u8 rc;
453
454 switch (cmd) {
455 case HPC_CTLR_ENABLEIRQ: // 0x00.N.15
456 case HPC_CTLR_CLEARIRQ: // 0x06.N.15
457 case HPC_CTLR_RESET: // 0x07.N.15
458 case HPC_CTLR_IRQSTEER: // 0x08.N.15
459 case HPC_CTLR_DISABLEIRQ: // 0x01.N.15
460 case HPC_ALLSLOT_ON: // 0x11.N.15
461 case HPC_ALLSLOT_OFF: // 0x12.N.15
462 rc = 0x0F;
463 break;
464
465 case HPC_SLOT_OFF: // 0x02.Y.0-14
466 case HPC_SLOT_ON: // 0x03.Y.0-14
467 case HPC_SLOT_ATTNOFF: // 0x04.N.0-14
468 case HPC_SLOT_ATTNON: // 0x05.N.0-14
469 case HPC_SLOT_BLINKLED: // 0x13.N.0-14
470 rc = index;
471 break;
472
473 case HPC_BUS_33CONVMODE:
474 case HPC_BUS_66CONVMODE:
475 case HPC_BUS_66PCIXMODE:
476 case HPC_BUS_100PCIXMODE:
477 case HPC_BUS_133PCIXMODE:
478 rc = index + WPG_1ST_BUS_INDEX - 1;
479 break;
480
481 default:
482 err ("hpc_writecmdtoindex - Error invalid cmd[%x]\n", cmd);
483 rc = HPC_ERROR;
484 }
485
486 return rc;
487 }
488
489 /*----------------------------------------------------------------------
490 * Name: hpc_readcmdtoindex()
491 *
492 * Action: convert a read command to proper index within a controller
493 *
494 * Return index, HPC_ERROR
495 *---------------------------------------------------------------------*/
496 static u8 hpc_readcmdtoindex (u8 cmd, u8 index)
497 {
498 u8 rc;
499
500 switch (cmd) {
501 case READ_CTLRSTATUS:
502 rc = 0x0F;
503 break;
504 case READ_SLOTSTATUS:
505 case READ_ALLSTAT:
506 rc = index;
507 break;
508 case READ_EXTSLOTSTATUS:
509 rc = index + WPG_1ST_EXTSLOT_INDEX;
510 break;
511 case READ_BUSSTATUS:
512 rc = index + WPG_1ST_BUS_INDEX - 1;
513 break;
514 case READ_SLOTLATCHLOWREG:
515 rc = 0x28;
516 break;
517 case READ_REVLEVEL:
518 rc = 0x25;
519 break;
520 case READ_HPCOPTIONS:
521 rc = 0x27;
522 break;
523 default:
524 rc = HPC_ERROR;
525 }
526 return rc;
527 }
528
529 /*----------------------------------------------------------------------
530 * Name: HPCreadslot()
531 *
532 * Action: issue a READ command to HPC
533 *
534 * Input: pslot - can not be NULL for READ_ALLSTAT
535 * pstatus - can be NULL for READ_ALLSTAT
536 *
537 * Return 0 or error codes
538 *---------------------------------------------------------------------*/
539 int ibmphp_hpc_readslot (struct slot * pslot, u8 cmd, u8 * pstatus)
540 {
541 void __iomem *wpg_bbar = NULL;
542 struct controller *ctlr_ptr;
543 struct list_head *pslotlist;
544 u8 index, status;
545 int rc = 0;
546 int busindex;
547
548 debug_polling ("%s - Entry pslot[%p] cmd[%x] pstatus[%p]\n", __FUNCTION__, pslot, cmd, pstatus);
549
550 if ((pslot == NULL)
551 || ((pstatus == NULL) && (cmd != READ_ALLSTAT) && (cmd != READ_BUSSTATUS))) {
552 rc = -EINVAL;
553 err ("%s - Error invalid pointer, rc[%d]\n", __FUNCTION__, rc);
554 return rc;
555 }
556
557 if (cmd == READ_BUSSTATUS) {
558 busindex = ibmphp_get_bus_index (pslot->bus);
559 if (busindex < 0) {
560 rc = -EINVAL;
561 err ("%s - Exit Error:invalid bus, rc[%d]\n", __FUNCTION__, rc);
562 return rc;
563 } else
564 index = (u8) busindex;
565 } else
566 index = pslot->ctlr_index;
567
568 index = hpc_readcmdtoindex (cmd, index);
569
570 if (index == HPC_ERROR) {
571 rc = -EINVAL;
572 err ("%s - Exit Error:invalid index, rc[%d]\n", __FUNCTION__, rc);
573 return rc;
574 }
575
576 ctlr_ptr = pslot->ctrl;
577
578 get_hpc_access ();
579
580 //--------------------------------------------------------------------
581 // map physical address to logical address
582 //--------------------------------------------------------------------
583 if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
584 wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
585
586 //--------------------------------------------------------------------
587 // check controller status before reading
588 //--------------------------------------------------------------------
589 rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
590 if (!rc) {
591 switch (cmd) {
592 case READ_ALLSTAT:
593 // update the slot structure
594 pslot->ctrl->status = status;
595 pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index);
596 rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
597 &status);
598 if (!rc)
599 pslot->ext_status = ctrl_read (ctlr_ptr, wpg_bbar, index + WPG_1ST_EXTSLOT_INDEX);
600
601 break;
602
603 case READ_SLOTSTATUS:
604 // DO NOT update the slot structure
605 *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
606 break;
607
608 case READ_EXTSLOTSTATUS:
609 // DO NOT update the slot structure
610 *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
611 break;
612
613 case READ_CTLRSTATUS:
614 // DO NOT update the slot structure
615 *pstatus = status;
616 break;
617
618 case READ_BUSSTATUS:
619 pslot->busstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
620 break;
621 case READ_REVLEVEL:
622 *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
623 break;
624 case READ_HPCOPTIONS:
625 *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
626 break;
627 case READ_SLOTLATCHLOWREG:
628 // DO NOT update the slot structure
629 *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
630 break;
631
632 // Not used
633 case READ_ALLSLOT:
634 list_for_each (pslotlist, &ibmphp_slot_head) {
635 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
636 index = pslot->ctlr_index;
637 rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr,
638 wpg_bbar, &status);
639 if (!rc) {
640 pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index);
641 rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT,
642 ctlr_ptr, wpg_bbar, &status);
643 if (!rc)
644 pslot->ext_status =
645 ctrl_read (ctlr_ptr, wpg_bbar,
646 index + WPG_1ST_EXTSLOT_INDEX);
647 } else {
648 err ("%s - Error ctrl_read failed\n", __FUNCTION__);
649 rc = -EINVAL;
650 break;
651 }
652 }
653 break;
654 default:
655 rc = -EINVAL;
656 break;
657 }
658 }
659 //--------------------------------------------------------------------
660 // cleanup
661 //--------------------------------------------------------------------
662
663 // remove physical to logical address mapping
664 if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
665 iounmap (wpg_bbar);
666
667 free_hpc_access ();
668
669 debug_polling ("%s - Exit rc[%d]\n", __FUNCTION__, rc);
670 return rc;
671 }
672
673 /*----------------------------------------------------------------------
674 * Name: ibmphp_hpc_writeslot()
675 *
676 * Action: issue a WRITE command to HPC
677 *---------------------------------------------------------------------*/
678 int ibmphp_hpc_writeslot (struct slot * pslot, u8 cmd)
679 {
680 void __iomem *wpg_bbar = NULL;
681 struct controller *ctlr_ptr;
682 u8 index, status;
683 int busindex;
684 u8 done;
685 int rc = 0;
686 int timeout;
687
688 debug_polling ("%s - Entry pslot[%p] cmd[%x]\n", __FUNCTION__, pslot, cmd);
689 if (pslot == NULL) {
690 rc = -EINVAL;
691 err ("%s - Error Exit rc[%d]\n", __FUNCTION__, rc);
692 return rc;
693 }
694
695 if ((cmd == HPC_BUS_33CONVMODE) || (cmd == HPC_BUS_66CONVMODE) ||
696 (cmd == HPC_BUS_66PCIXMODE) || (cmd == HPC_BUS_100PCIXMODE) ||
697 (cmd == HPC_BUS_133PCIXMODE)) {
698 busindex = ibmphp_get_bus_index (pslot->bus);
699 if (busindex < 0) {
700 rc = -EINVAL;
701 err ("%s - Exit Error:invalid bus, rc[%d]\n", __FUNCTION__, rc);
702 return rc;
703 } else
704 index = (u8) busindex;
705 } else
706 index = pslot->ctlr_index;
707
708 index = hpc_writecmdtoindex (cmd, index);
709
710 if (index == HPC_ERROR) {
711 rc = -EINVAL;
712 err ("%s - Error Exit rc[%d]\n", __FUNCTION__, rc);
713 return rc;
714 }
715
716 ctlr_ptr = pslot->ctrl;
717
718 get_hpc_access ();
719
720 //--------------------------------------------------------------------
721 // map physical address to logical address
722 //--------------------------------------------------------------------
723 if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) {
724 wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
725
726 debug ("%s - ctlr id[%x] physical[%lx] logical[%lx] i2c[%x]\n", __FUNCTION__,
727 ctlr_ptr->ctlr_id, (ulong) (ctlr_ptr->u.wpeg_ctlr.wpegbbar), (ulong) wpg_bbar,
728 ctlr_ptr->u.wpeg_ctlr.i2c_addr);
729 }
730 //--------------------------------------------------------------------
731 // check controller status before writing
732 //--------------------------------------------------------------------
733 rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
734 if (!rc) {
735
736 ctrl_write (ctlr_ptr, wpg_bbar, index, cmd);
737
738 //--------------------------------------------------------------------
739 // check controller is still not working on the command
740 //--------------------------------------------------------------------
741 timeout = CMD_COMPLETE_TOUT_SEC;
742 done = 0;
743 while (!done) {
744 rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
745 &status);
746 if (!rc) {
747 if (NEEDTOCHECK_CMDSTATUS (cmd)) {
748 if (CTLR_FINISHED (status) == HPC_CTLR_FINISHED_YES)
749 done = 1;
750 } else
751 done = 1;
752 }
753 if (!done) {
754 msleep(1000);
755 if (timeout < 1) {
756 done = 1;
757 err ("%s - Error command complete timeout\n", __FUNCTION__);
758 rc = -EFAULT;
759 } else
760 timeout--;
761 }
762 }
763 ctlr_ptr->status = status;
764 }
765 // cleanup
766
767 // remove physical to logical address mapping
768 if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
769 iounmap (wpg_bbar);
770 free_hpc_access ();
771
772 debug_polling ("%s - Exit rc[%d]\n", __FUNCTION__, rc);
773 return rc;
774 }
775
776 /*----------------------------------------------------------------------
777 * Name: get_hpc_access()
778 *
779 * Action: make sure only one process can access HPC at one time
780 *---------------------------------------------------------------------*/
781 static void get_hpc_access (void)
782 {
783 mutex_lock(&sem_hpcaccess);
784 }
785
786 /*----------------------------------------------------------------------
787 * Name: free_hpc_access()
788 *---------------------------------------------------------------------*/
789 void free_hpc_access (void)
790 {
791 mutex_unlock(&sem_hpcaccess);
792 }
793
794 /*----------------------------------------------------------------------
795 * Name: ibmphp_lock_operations()
796 *
797 * Action: make sure only one process can change the data structure
798 *---------------------------------------------------------------------*/
799 void ibmphp_lock_operations (void)
800 {
801 down (&semOperations);
802 to_debug = 1;
803 }
804
805 /*----------------------------------------------------------------------
806 * Name: ibmphp_unlock_operations()
807 *---------------------------------------------------------------------*/
808 void ibmphp_unlock_operations (void)
809 {
810 debug ("%s - Entry\n", __FUNCTION__);
811 up (&semOperations);
812 to_debug = 0;
813 debug ("%s - Exit\n", __FUNCTION__);
814 }
815
816 /*----------------------------------------------------------------------
817 * Name: poll_hpc()
818 *---------------------------------------------------------------------*/
819 #define POLL_LATCH_REGISTER 0
820 #define POLL_SLOTS 1
821 #define POLL_SLEEP 2
822 static void poll_hpc (void)
823 {
824 struct slot myslot;
825 struct slot *pslot = NULL;
826 struct list_head *pslotlist;
827 int rc;
828 int poll_state = POLL_LATCH_REGISTER;
829 u8 oldlatchlow = 0x00;
830 u8 curlatchlow = 0x00;
831 int poll_count = 0;
832 u8 ctrl_count = 0x00;
833
834 debug ("%s - Entry\n", __FUNCTION__);
835
836 while (!ibmphp_shutdown) {
837 if (ibmphp_shutdown)
838 break;
839
840 /* try to get the lock to do some kind of hardware access */
841 down (&semOperations);
842
843 switch (poll_state) {
844 case POLL_LATCH_REGISTER:
845 oldlatchlow = curlatchlow;
846 ctrl_count = 0x00;
847 list_for_each (pslotlist, &ibmphp_slot_head) {
848 if (ctrl_count >= ibmphp_get_total_controllers())
849 break;
850 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
851 if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
852 ctrl_count++;
853 if (READ_SLOT_LATCH (pslot->ctrl)) {
854 rc = ibmphp_hpc_readslot (pslot,
855 READ_SLOTLATCHLOWREG,
856 &curlatchlow);
857 if (oldlatchlow != curlatchlow)
858 process_changeinlatch (oldlatchlow,
859 curlatchlow,
860 pslot->ctrl);
861 }
862 }
863 }
864 ++poll_count;
865 poll_state = POLL_SLEEP;
866 break;
867 case POLL_SLOTS:
868 list_for_each (pslotlist, &ibmphp_slot_head) {
869 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
870 // make a copy of the old status
871 memcpy ((void *) &myslot, (void *) pslot,
872 sizeof (struct slot));
873 rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL);
874 if ((myslot.status != pslot->status)
875 || (myslot.ext_status != pslot->ext_status))
876 process_changeinstatus (pslot, &myslot);
877 }
878 ctrl_count = 0x00;
879 list_for_each (pslotlist, &ibmphp_slot_head) {
880 if (ctrl_count >= ibmphp_get_total_controllers())
881 break;
882 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
883 if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
884 ctrl_count++;
885 if (READ_SLOT_LATCH (pslot->ctrl))
886 rc = ibmphp_hpc_readslot (pslot,
887 READ_SLOTLATCHLOWREG,
888 &curlatchlow);
889 }
890 }
891 ++poll_count;
892 poll_state = POLL_SLEEP;
893 break;
894 case POLL_SLEEP:
895 /* don't sleep with a lock on the hardware */
896 up (&semOperations);
897 msleep(POLL_INTERVAL_SEC * 1000);
898
899 if (ibmphp_shutdown)
900 break;
901
902 down (&semOperations);
903
904 if (poll_count >= POLL_LATCH_CNT) {
905 poll_count = 0;
906 poll_state = POLL_SLOTS;
907 } else
908 poll_state = POLL_LATCH_REGISTER;
909 break;
910 }
911 /* give up the hardware semaphore */
912 up (&semOperations);
913 /* sleep for a short time just for good measure */
914 msleep(100);
915 }
916 up (&sem_exit);
917 debug ("%s - Exit\n", __FUNCTION__);
918 }
919
920
921 /*----------------------------------------------------------------------
922 * Name: process_changeinstatus
923 *
924 * Action: compare old and new slot status, process the change in status
925 *
926 * Input: pointer to slot struct, old slot struct
927 *
928 * Return 0 or error codes
929 * Value:
930 *
931 * Side
932 * Effects: None.
933 *
934 * Notes:
935 *---------------------------------------------------------------------*/
936 static int process_changeinstatus (struct slot *pslot, struct slot *poldslot)
937 {
938 u8 status;
939 int rc = 0;
940 u8 disable = 0;
941 u8 update = 0;
942
943 debug ("process_changeinstatus - Entry pslot[%p], poldslot[%p]\n", pslot, poldslot);
944
945 // bit 0 - HPC_SLOT_POWER
946 if ((pslot->status & 0x01) != (poldslot->status & 0x01))
947 update = 1;
948
949 // bit 1 - HPC_SLOT_CONNECT
950 // ignore
951
952 // bit 2 - HPC_SLOT_ATTN
953 if ((pslot->status & 0x04) != (poldslot->status & 0x04))
954 update = 1;
955
956 // bit 3 - HPC_SLOT_PRSNT2
957 // bit 4 - HPC_SLOT_PRSNT1
958 if (((pslot->status & 0x08) != (poldslot->status & 0x08))
959 || ((pslot->status & 0x10) != (poldslot->status & 0x10)))
960 update = 1;
961
962 // bit 5 - HPC_SLOT_PWRGD
963 if ((pslot->status & 0x20) != (poldslot->status & 0x20))
964 // OFF -> ON: ignore, ON -> OFF: disable slot
965 if ((poldslot->status & 0x20) && (SLOT_CONNECT (poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT (poldslot->status)))
966 disable = 1;
967
968 // bit 6 - HPC_SLOT_BUS_SPEED
969 // ignore
970
971 // bit 7 - HPC_SLOT_LATCH
972 if ((pslot->status & 0x80) != (poldslot->status & 0x80)) {
973 update = 1;
974 // OPEN -> CLOSE
975 if (pslot->status & 0x80) {
976 if (SLOT_PWRGD (pslot->status)) {
977 // power goes on and off after closing latch
978 // check again to make sure power is still ON
979 msleep(1000);
980 rc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &status);
981 if (SLOT_PWRGD (status))
982 update = 1;
983 else // overwrite power in pslot to OFF
984 pslot->status &= ~HPC_SLOT_POWER;
985 }
986 }
987 // CLOSE -> OPEN
988 else if ((SLOT_PWRGD (poldslot->status) == HPC_SLOT_PWRGD_GOOD)
989 && (SLOT_CONNECT (poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT (poldslot->status))) {
990 disable = 1;
991 }
992 // else - ignore
993 }
994 // bit 4 - HPC_SLOT_BLINK_ATTN
995 if ((pslot->ext_status & 0x08) != (poldslot->ext_status & 0x08))
996 update = 1;
997
998 if (disable) {
999 debug ("process_changeinstatus - disable slot\n");
1000 pslot->flag = 0;
1001 rc = ibmphp_do_disable_slot (pslot);
1002 }
1003
1004 if (update || disable) {
1005 ibmphp_update_slot_info (pslot);
1006 }
1007
1008 debug ("%s - Exit rc[%d] disable[%x] update[%x]\n", __FUNCTION__, rc, disable, update);
1009
1010 return rc;
1011 }
1012
1013 /*----------------------------------------------------------------------
1014 * Name: process_changeinlatch
1015 *
1016 * Action: compare old and new latch reg status, process the change
1017 *
1018 * Input: old and current latch register status
1019 *
1020 * Return 0 or error codes
1021 * Value:
1022 *---------------------------------------------------------------------*/
1023 static int process_changeinlatch (u8 old, u8 new, struct controller *ctrl)
1024 {
1025 struct slot myslot, *pslot;
1026 u8 i;
1027 u8 mask;
1028 int rc = 0;
1029
1030 debug ("%s - Entry old[%x], new[%x]\n", __FUNCTION__, old, new);
1031 // bit 0 reserved, 0 is LSB, check bit 1-6 for 6 slots
1032
1033 for (i = ctrl->starting_slot_num; i <= ctrl->ending_slot_num; i++) {
1034 mask = 0x01 << i;
1035 if ((mask & old) != (mask & new)) {
1036 pslot = ibmphp_get_slot_from_physical_num (i);
1037 if (pslot) {
1038 memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
1039 rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL);
1040 debug ("%s - call process_changeinstatus for slot[%d]\n", __FUNCTION__, i);
1041 process_changeinstatus (pslot, &myslot);
1042 } else {
1043 rc = -EINVAL;
1044 err ("%s - Error bad pointer for slot[%d]\n", __FUNCTION__, i);
1045 }
1046 }
1047 }
1048 debug ("%s - Exit rc[%d]\n", __FUNCTION__, rc);
1049 return rc;
1050 }
1051
1052 /*----------------------------------------------------------------------
1053 * Name: hpc_poll_thread
1054 *
1055 * Action: polling
1056 *
1057 * Return 0
1058 * Value:
1059 *---------------------------------------------------------------------*/
1060 static int hpc_poll_thread (void *data)
1061 {
1062 debug ("%s - Entry\n", __FUNCTION__);
1063
1064 daemonize("hpc_poll");
1065 allow_signal(SIGKILL);
1066
1067 poll_hpc ();
1068
1069 tid_poll = 0;
1070 debug ("%s - Exit\n", __FUNCTION__);
1071 return 0;
1072 }
1073
1074
1075 /*----------------------------------------------------------------------
1076 * Name: ibmphp_hpc_start_poll_thread
1077 *
1078 * Action: start polling thread
1079 *---------------------------------------------------------------------*/
1080 int __init ibmphp_hpc_start_poll_thread (void)
1081 {
1082 int rc = 0;
1083
1084 debug ("%s - Entry\n", __FUNCTION__);
1085
1086 tid_poll = kernel_thread (hpc_poll_thread, NULL, 0);
1087 if (tid_poll < 0) {
1088 err ("%s - Error, thread not started\n", __FUNCTION__);
1089 rc = -1;
1090 }
1091
1092 debug ("%s - Exit tid_poll[%d] rc[%d]\n", __FUNCTION__, tid_poll, rc);
1093 return rc;
1094 }
1095
1096 /*----------------------------------------------------------------------
1097 * Name: ibmphp_hpc_stop_poll_thread
1098 *
1099 * Action: stop polling thread and cleanup
1100 *---------------------------------------------------------------------*/
1101 void __exit ibmphp_hpc_stop_poll_thread (void)
1102 {
1103 debug ("%s - Entry\n", __FUNCTION__);
1104
1105 ibmphp_shutdown = 1;
1106 debug ("before locking operations \n");
1107 ibmphp_lock_operations ();
1108 debug ("after locking operations \n");
1109
1110 // wait for poll thread to exit
1111 debug ("before sem_exit down \n");
1112 down (&sem_exit);
1113 debug ("after sem_exit down \n");
1114
1115 // cleanup
1116 debug ("before free_hpc_access \n");
1117 free_hpc_access ();
1118 debug ("after free_hpc_access \n");
1119 ibmphp_unlock_operations ();
1120 debug ("after unlock operations \n");
1121 up (&sem_exit);
1122 debug ("after sem exit up\n");
1123
1124 debug ("%s - Exit\n", __FUNCTION__);
1125 }
1126
1127 /*----------------------------------------------------------------------
1128 * Name: hpc_wait_ctlr_notworking
1129 *
1130 * Action: wait until the controller is in a not working state
1131 *
1132 * Return 0, HPC_ERROR
1133 * Value:
1134 *---------------------------------------------------------------------*/
1135 static int hpc_wait_ctlr_notworking (int timeout, struct controller *ctlr_ptr, void __iomem *wpg_bbar,
1136 u8 * pstatus)
1137 {
1138 int rc = 0;
1139 u8 done = 0;
1140
1141 debug_polling ("hpc_wait_ctlr_notworking - Entry timeout[%d]\n", timeout);
1142
1143 while (!done) {
1144 *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, WPG_CTLR_INDEX);
1145 if (*pstatus == HPC_ERROR) {
1146 rc = HPC_ERROR;
1147 done = 1;
1148 }
1149 if (CTLR_WORKING (*pstatus) == HPC_CTLR_WORKING_NO)
1150 done = 1;
1151 if (!done) {
1152 msleep(1000);
1153 if (timeout < 1) {
1154 done = 1;
1155 err ("HPCreadslot - Error ctlr timeout\n");
1156 rc = HPC_ERROR;
1157 } else
1158 timeout--;
1159 }
1160 }
1161 debug_polling ("hpc_wait_ctlr_notworking - Exit rc[%x] status[%x]\n", rc, *pstatus);
1162 return rc;
1163 }
Support for the Chinese Samsung S3C2440 based development boards