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Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6
[deliverable/linux.git] / drivers / pci / hotplug / shpchp_hpc.c
1 /*
2 * Standard PCI Hot Plug Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com>
27 *
28 */
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <linux/pci.h>
34 #include <linux/interrupt.h>
35
36 #include "shpchp.h"
37
38 /* Slot Available Register I field definition */
39 #define SLOT_33MHZ 0x0000001f
40 #define SLOT_66MHZ_PCIX 0x00001f00
41 #define SLOT_100MHZ_PCIX 0x001f0000
42 #define SLOT_133MHZ_PCIX 0x1f000000
43
44 /* Slot Available Register II field definition */
45 #define SLOT_66MHZ 0x0000001f
46 #define SLOT_66MHZ_PCIX_266 0x00000f00
47 #define SLOT_100MHZ_PCIX_266 0x0000f000
48 #define SLOT_133MHZ_PCIX_266 0x000f0000
49 #define SLOT_66MHZ_PCIX_533 0x00f00000
50 #define SLOT_100MHZ_PCIX_533 0x0f000000
51 #define SLOT_133MHZ_PCIX_533 0xf0000000
52
53 /* Slot Configuration */
54 #define SLOT_NUM 0x0000001F
55 #define FIRST_DEV_NUM 0x00001F00
56 #define PSN 0x07FF0000
57 #define UPDOWN 0x20000000
58 #define MRLSENSOR 0x40000000
59 #define ATTN_BUTTON 0x80000000
60
61 /*
62 * Interrupt Locator Register definitions
63 */
64 #define CMD_INTR_PENDING (1 << 0)
65 #define SLOT_INTR_PENDING(i) (1 << (i + 1))
66
67 /*
68 * Controller SERR-INT Register
69 */
70 #define GLOBAL_INTR_MASK (1 << 0)
71 #define GLOBAL_SERR_MASK (1 << 1)
72 #define COMMAND_INTR_MASK (1 << 2)
73 #define ARBITER_SERR_MASK (1 << 3)
74 #define COMMAND_DETECTED (1 << 16)
75 #define ARBITER_DETECTED (1 << 17)
76 #define SERR_INTR_RSVDZ_MASK 0xfffc0000
77
78 /*
79 * Logical Slot Register definitions
80 */
81 #define SLOT_REG(i) (SLOT1 + (4 * i))
82
83 #define SLOT_STATE_SHIFT (0)
84 #define SLOT_STATE_MASK (3 << 0)
85 #define SLOT_STATE_PWRONLY (1)
86 #define SLOT_STATE_ENABLED (2)
87 #define SLOT_STATE_DISABLED (3)
88 #define PWR_LED_STATE_SHIFT (2)
89 #define PWR_LED_STATE_MASK (3 << 2)
90 #define ATN_LED_STATE_SHIFT (4)
91 #define ATN_LED_STATE_MASK (3 << 4)
92 #define ATN_LED_STATE_ON (1)
93 #define ATN_LED_STATE_BLINK (2)
94 #define ATN_LED_STATE_OFF (3)
95 #define POWER_FAULT (1 << 6)
96 #define ATN_BUTTON (1 << 7)
97 #define MRL_SENSOR (1 << 8)
98 #define MHZ66_CAP (1 << 9)
99 #define PRSNT_SHIFT (10)
100 #define PRSNT_MASK (3 << 10)
101 #define PCIX_CAP_SHIFT (12)
102 #define PCIX_CAP_MASK_PI1 (3 << 12)
103 #define PCIX_CAP_MASK_PI2 (7 << 12)
104 #define PRSNT_CHANGE_DETECTED (1 << 16)
105 #define ISO_PFAULT_DETECTED (1 << 17)
106 #define BUTTON_PRESS_DETECTED (1 << 18)
107 #define MRL_CHANGE_DETECTED (1 << 19)
108 #define CON_PFAULT_DETECTED (1 << 20)
109 #define PRSNT_CHANGE_INTR_MASK (1 << 24)
110 #define ISO_PFAULT_INTR_MASK (1 << 25)
111 #define BUTTON_PRESS_INTR_MASK (1 << 26)
112 #define MRL_CHANGE_INTR_MASK (1 << 27)
113 #define CON_PFAULT_INTR_MASK (1 << 28)
114 #define MRL_CHANGE_SERR_MASK (1 << 29)
115 #define CON_PFAULT_SERR_MASK (1 << 30)
116 #define SLOT_REG_RSVDZ_MASK (1 << 15) | (7 << 21)
117
118 /*
119 * SHPC Command Code definitnions
120 *
121 * Slot Operation 00h - 3Fh
122 * Set Bus Segment Speed/Mode A 40h - 47h
123 * Power-Only All Slots 48h
124 * Enable All Slots 49h
125 * Set Bus Segment Speed/Mode B (PI=2) 50h - 5Fh
126 * Reserved Command Codes 60h - BFh
127 * Vendor Specific Commands C0h - FFh
128 */
129 #define SET_SLOT_PWR 0x01 /* Slot Operation */
130 #define SET_SLOT_ENABLE 0x02
131 #define SET_SLOT_DISABLE 0x03
132 #define SET_PWR_ON 0x04
133 #define SET_PWR_BLINK 0x08
134 #define SET_PWR_OFF 0x0c
135 #define SET_ATTN_ON 0x10
136 #define SET_ATTN_BLINK 0x20
137 #define SET_ATTN_OFF 0x30
138 #define SETA_PCI_33MHZ 0x40 /* Set Bus Segment Speed/Mode A */
139 #define SETA_PCI_66MHZ 0x41
140 #define SETA_PCIX_66MHZ 0x42
141 #define SETA_PCIX_100MHZ 0x43
142 #define SETA_PCIX_133MHZ 0x44
143 #define SETA_RESERVED1 0x45
144 #define SETA_RESERVED2 0x46
145 #define SETA_RESERVED3 0x47
146 #define SET_PWR_ONLY_ALL 0x48 /* Power-Only All Slots */
147 #define SET_ENABLE_ALL 0x49 /* Enable All Slots */
148 #define SETB_PCI_33MHZ 0x50 /* Set Bus Segment Speed/Mode B */
149 #define SETB_PCI_66MHZ 0x51
150 #define SETB_PCIX_66MHZ_PM 0x52
151 #define SETB_PCIX_100MHZ_PM 0x53
152 #define SETB_PCIX_133MHZ_PM 0x54
153 #define SETB_PCIX_66MHZ_EM 0x55
154 #define SETB_PCIX_100MHZ_EM 0x56
155 #define SETB_PCIX_133MHZ_EM 0x57
156 #define SETB_PCIX_66MHZ_266 0x58
157 #define SETB_PCIX_100MHZ_266 0x59
158 #define SETB_PCIX_133MHZ_266 0x5a
159 #define SETB_PCIX_66MHZ_533 0x5b
160 #define SETB_PCIX_100MHZ_533 0x5c
161 #define SETB_PCIX_133MHZ_533 0x5d
162 #define SETB_RESERVED1 0x5e
163 #define SETB_RESERVED2 0x5f
164
165 /*
166 * SHPC controller command error code
167 */
168 #define SWITCH_OPEN 0x1
169 #define INVALID_CMD 0x2
170 #define INVALID_SPEED_MODE 0x4
171
172 /*
173 * For accessing SHPC Working Register Set via PCI Configuration Space
174 */
175 #define DWORD_SELECT 0x2
176 #define DWORD_DATA 0x4
177
178 /* Field Offset in Logical Slot Register - byte boundary */
179 #define SLOT_EVENT_LATCH 0x2
180 #define SLOT_SERR_INT_MASK 0x3
181
182 static atomic_t shpchp_num_controllers = ATOMIC_INIT(0);
183
184 static irqreturn_t shpc_isr(int irq, void *dev_id);
185 static void start_int_poll_timer(struct controller *ctrl, int sec);
186 static int hpc_check_cmd_status(struct controller *ctrl);
187
188 static inline u8 shpc_readb(struct controller *ctrl, int reg)
189 {
190 return readb(ctrl->creg + reg);
191 }
192
193 static inline void shpc_writeb(struct controller *ctrl, int reg, u8 val)
194 {
195 writeb(val, ctrl->creg + reg);
196 }
197
198 static inline u16 shpc_readw(struct controller *ctrl, int reg)
199 {
200 return readw(ctrl->creg + reg);
201 }
202
203 static inline void shpc_writew(struct controller *ctrl, int reg, u16 val)
204 {
205 writew(val, ctrl->creg + reg);
206 }
207
208 static inline u32 shpc_readl(struct controller *ctrl, int reg)
209 {
210 return readl(ctrl->creg + reg);
211 }
212
213 static inline void shpc_writel(struct controller *ctrl, int reg, u32 val)
214 {
215 writel(val, ctrl->creg + reg);
216 }
217
218 static inline int shpc_indirect_read(struct controller *ctrl, int index,
219 u32 *value)
220 {
221 int rc;
222 u32 cap_offset = ctrl->cap_offset;
223 struct pci_dev *pdev = ctrl->pci_dev;
224
225 rc = pci_write_config_byte(pdev, cap_offset + DWORD_SELECT, index);
226 if (rc)
227 return rc;
228 return pci_read_config_dword(pdev, cap_offset + DWORD_DATA, value);
229 }
230
231 /*
232 * This is the interrupt polling timeout function.
233 */
234 static void int_poll_timeout(unsigned long data)
235 {
236 struct controller *ctrl = (struct controller *)data;
237
238 /* Poll for interrupt events. regs == NULL => polling */
239 shpc_isr(0, ctrl);
240
241 init_timer(&ctrl->poll_timer);
242 if (!shpchp_poll_time)
243 shpchp_poll_time = 2; /* default polling interval is 2 sec */
244
245 start_int_poll_timer(ctrl, shpchp_poll_time);
246 }
247
248 /*
249 * This function starts the interrupt polling timer.
250 */
251 static void start_int_poll_timer(struct controller *ctrl, int sec)
252 {
253 /* Clamp to sane value */
254 if ((sec <= 0) || (sec > 60))
255 sec = 2;
256
257 ctrl->poll_timer.function = &int_poll_timeout;
258 ctrl->poll_timer.data = (unsigned long)ctrl;
259 ctrl->poll_timer.expires = jiffies + sec * HZ;
260 add_timer(&ctrl->poll_timer);
261 }
262
263 static inline int is_ctrl_busy(struct controller *ctrl)
264 {
265 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS);
266 return cmd_status & 0x1;
267 }
268
269 /*
270 * Returns 1 if SHPC finishes executing a command within 1 sec,
271 * otherwise returns 0.
272 */
273 static inline int shpc_poll_ctrl_busy(struct controller *ctrl)
274 {
275 int i;
276
277 if (!is_ctrl_busy(ctrl))
278 return 1;
279
280 /* Check every 0.1 sec for a total of 1 sec */
281 for (i = 0; i < 10; i++) {
282 msleep(100);
283 if (!is_ctrl_busy(ctrl))
284 return 1;
285 }
286
287 return 0;
288 }
289
290 static inline int shpc_wait_cmd(struct controller *ctrl)
291 {
292 int retval = 0;
293 unsigned long timeout = msecs_to_jiffies(1000);
294 int rc;
295
296 if (shpchp_poll_mode)
297 rc = shpc_poll_ctrl_busy(ctrl);
298 else
299 rc = wait_event_interruptible_timeout(ctrl->queue,
300 !is_ctrl_busy(ctrl), timeout);
301 if (!rc && is_ctrl_busy(ctrl)) {
302 retval = -EIO;
303 err("Command not completed in 1000 msec\n");
304 } else if (rc < 0) {
305 retval = -EINTR;
306 info("Command was interrupted by a signal\n");
307 }
308
309 return retval;
310 }
311
312 static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
313 {
314 struct controller *ctrl = slot->ctrl;
315 u16 cmd_status;
316 int retval = 0;
317 u16 temp_word;
318
319 mutex_lock(&slot->ctrl->cmd_lock);
320
321 if (!shpc_poll_ctrl_busy(ctrl)) {
322 /* After 1 sec and and the controller is still busy */
323 err("%s : Controller is still busy after 1 sec.\n",
324 __FUNCTION__);
325 retval = -EBUSY;
326 goto out;
327 }
328
329 ++t_slot;
330 temp_word = (t_slot << 8) | (cmd & 0xFF);
331 dbg("%s: t_slot %x cmd %x\n", __FUNCTION__, t_slot, cmd);
332
333 /* To make sure the Controller Busy bit is 0 before we send out the
334 * command.
335 */
336 shpc_writew(ctrl, CMD, temp_word);
337
338 /*
339 * Wait for command completion.
340 */
341 retval = shpc_wait_cmd(slot->ctrl);
342 if (retval)
343 goto out;
344
345 cmd_status = hpc_check_cmd_status(slot->ctrl);
346 if (cmd_status) {
347 err("%s: Failed to issued command 0x%x (error code = %d)\n",
348 __FUNCTION__, cmd, cmd_status);
349 retval = -EIO;
350 }
351 out:
352 mutex_unlock(&slot->ctrl->cmd_lock);
353 return retval;
354 }
355
356 static int hpc_check_cmd_status(struct controller *ctrl)
357 {
358 int retval = 0;
359 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS) & 0x000F;
360
361 switch (cmd_status >> 1) {
362 case 0:
363 retval = 0;
364 break;
365 case 1:
366 retval = SWITCH_OPEN;
367 err("%s: Switch opened!\n", __FUNCTION__);
368 break;
369 case 2:
370 retval = INVALID_CMD;
371 err("%s: Invalid HPC command!\n", __FUNCTION__);
372 break;
373 case 4:
374 retval = INVALID_SPEED_MODE;
375 err("%s: Invalid bus speed/mode!\n", __FUNCTION__);
376 break;
377 default:
378 retval = cmd_status;
379 }
380
381 return retval;
382 }
383
384
385 static int hpc_get_attention_status(struct slot *slot, u8 *status)
386 {
387 struct controller *ctrl = slot->ctrl;
388 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
389 u8 state = (slot_reg & ATN_LED_STATE_MASK) >> ATN_LED_STATE_SHIFT;
390
391 switch (state) {
392 case ATN_LED_STATE_ON:
393 *status = 1; /* On */
394 break;
395 case ATN_LED_STATE_BLINK:
396 *status = 2; /* Blink */
397 break;
398 case ATN_LED_STATE_OFF:
399 *status = 0; /* Off */
400 break;
401 default:
402 *status = 0xFF; /* Reserved */
403 break;
404 }
405
406 return 0;
407 }
408
409 static int hpc_get_power_status(struct slot * slot, u8 *status)
410 {
411 struct controller *ctrl = slot->ctrl;
412 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
413 u8 state = (slot_reg & SLOT_STATE_MASK) >> SLOT_STATE_SHIFT;
414
415 switch (state) {
416 case SLOT_STATE_PWRONLY:
417 *status = 2; /* Powered only */
418 break;
419 case SLOT_STATE_ENABLED:
420 *status = 1; /* Enabled */
421 break;
422 case SLOT_STATE_DISABLED:
423 *status = 0; /* Disabled */
424 break;
425 default:
426 *status = 0xFF; /* Reserved */
427 break;
428 }
429
430 return 0;
431 }
432
433
434 static int hpc_get_latch_status(struct slot *slot, u8 *status)
435 {
436 struct controller *ctrl = slot->ctrl;
437 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
438
439 *status = !!(slot_reg & MRL_SENSOR); /* 0 -> close; 1 -> open */
440
441 return 0;
442 }
443
444 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
445 {
446 struct controller *ctrl = slot->ctrl;
447 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
448 u8 state = (slot_reg & PRSNT_MASK) >> PRSNT_SHIFT;
449
450 *status = (state != 0x3) ? 1 : 0;
451
452 return 0;
453 }
454
455 static int hpc_get_prog_int(struct slot *slot, u8 *prog_int)
456 {
457 struct controller *ctrl = slot->ctrl;
458
459 *prog_int = shpc_readb(ctrl, PROG_INTERFACE);
460
461 return 0;
462 }
463
464 static int hpc_get_adapter_speed(struct slot *slot, enum pci_bus_speed *value)
465 {
466 int retval = 0;
467 struct controller *ctrl = slot->ctrl;
468 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
469 u8 m66_cap = !!(slot_reg & MHZ66_CAP);
470 u8 pi, pcix_cap;
471
472 if ((retval = hpc_get_prog_int(slot, &pi)))
473 return retval;
474
475 switch (pi) {
476 case 1:
477 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI1) >> PCIX_CAP_SHIFT;
478 break;
479 case 2:
480 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI2) >> PCIX_CAP_SHIFT;
481 break;
482 default:
483 return -ENODEV;
484 }
485
486 dbg("%s: slot_reg = %x, pcix_cap = %x, m66_cap = %x\n",
487 __FUNCTION__, slot_reg, pcix_cap, m66_cap);
488
489 switch (pcix_cap) {
490 case 0x0:
491 *value = m66_cap ? PCI_SPEED_66MHz : PCI_SPEED_33MHz;
492 break;
493 case 0x1:
494 *value = PCI_SPEED_66MHz_PCIX;
495 break;
496 case 0x3:
497 *value = PCI_SPEED_133MHz_PCIX;
498 break;
499 case 0x4:
500 *value = PCI_SPEED_133MHz_PCIX_266;
501 break;
502 case 0x5:
503 *value = PCI_SPEED_133MHz_PCIX_533;
504 break;
505 case 0x2:
506 default:
507 *value = PCI_SPEED_UNKNOWN;
508 retval = -ENODEV;
509 break;
510 }
511
512 dbg("Adapter speed = %d\n", *value);
513 return retval;
514 }
515
516 static int hpc_get_mode1_ECC_cap(struct slot *slot, u8 *mode)
517 {
518 int retval = 0;
519 struct controller *ctrl = slot->ctrl;
520 u16 sec_bus_status = shpc_readw(ctrl, SEC_BUS_CONFIG);
521 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
522
523 if (pi == 2) {
524 *mode = (sec_bus_status & 0x0100) >> 8;
525 } else {
526 retval = -1;
527 }
528
529 dbg("Mode 1 ECC cap = %d\n", *mode);
530 return retval;
531 }
532
533 static int hpc_query_power_fault(struct slot * slot)
534 {
535 struct controller *ctrl = slot->ctrl;
536 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
537
538 /* Note: Logic 0 => fault */
539 return !(slot_reg & POWER_FAULT);
540 }
541
542 static int hpc_set_attention_status(struct slot *slot, u8 value)
543 {
544 u8 slot_cmd = 0;
545
546 switch (value) {
547 case 0 :
548 slot_cmd = SET_ATTN_OFF; /* OFF */
549 break;
550 case 1:
551 slot_cmd = SET_ATTN_ON; /* ON */
552 break;
553 case 2:
554 slot_cmd = SET_ATTN_BLINK; /* BLINK */
555 break;
556 default:
557 return -1;
558 }
559
560 return shpc_write_cmd(slot, slot->hp_slot, slot_cmd);
561 }
562
563
564 static void hpc_set_green_led_on(struct slot *slot)
565 {
566 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_ON);
567 }
568
569 static void hpc_set_green_led_off(struct slot *slot)
570 {
571 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_OFF);
572 }
573
574 static void hpc_set_green_led_blink(struct slot *slot)
575 {
576 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_BLINK);
577 }
578
579 static void hpc_release_ctlr(struct controller *ctrl)
580 {
581 int i;
582 u32 slot_reg, serr_int;
583
584 /*
585 * Mask event interrupts and SERRs of all slots
586 */
587 for (i = 0; i < ctrl->num_slots; i++) {
588 slot_reg = shpc_readl(ctrl, SLOT_REG(i));
589 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
590 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
591 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
592 CON_PFAULT_SERR_MASK);
593 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
594 shpc_writel(ctrl, SLOT_REG(i), slot_reg);
595 }
596
597 cleanup_slots(ctrl);
598
599 /*
600 * Mask SERR and System Interrut generation
601 */
602 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
603 serr_int |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
604 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
605 serr_int &= ~SERR_INTR_RSVDZ_MASK;
606 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
607
608 if (shpchp_poll_mode)
609 del_timer(&ctrl->poll_timer);
610 else {
611 free_irq(ctrl->pci_dev->irq, ctrl);
612 pci_disable_msi(ctrl->pci_dev);
613 }
614
615 iounmap(ctrl->creg);
616 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
617
618 /*
619 * If this is the last controller to be released, destroy the
620 * shpchpd work queue
621 */
622 if (atomic_dec_and_test(&shpchp_num_controllers))
623 destroy_workqueue(shpchp_wq);
624 }
625
626 static int hpc_power_on_slot(struct slot * slot)
627 {
628 int retval;
629
630 retval = shpc_write_cmd(slot, slot->hp_slot, SET_SLOT_PWR);
631 if (retval)
632 err("%s: Write command failed!\n", __FUNCTION__);
633
634 return retval;
635 }
636
637 static int hpc_slot_enable(struct slot * slot)
638 {
639 int retval;
640
641 /* Slot - Enable, Power Indicator - Blink, Attention Indicator - Off */
642 retval = shpc_write_cmd(slot, slot->hp_slot,
643 SET_SLOT_ENABLE | SET_PWR_BLINK | SET_ATTN_OFF);
644 if (retval)
645 err("%s: Write command failed!\n", __FUNCTION__);
646
647 return retval;
648 }
649
650 static int hpc_slot_disable(struct slot * slot)
651 {
652 int retval;
653
654 /* Slot - Disable, Power Indicator - Off, Attention Indicator - On */
655 retval = shpc_write_cmd(slot, slot->hp_slot,
656 SET_SLOT_DISABLE | SET_PWR_OFF | SET_ATTN_ON);
657 if (retval)
658 err("%s: Write command failed!\n", __FUNCTION__);
659
660 return retval;
661 }
662
663 static int hpc_set_bus_speed_mode(struct slot * slot, enum pci_bus_speed value)
664 {
665 int retval;
666 struct controller *ctrl = slot->ctrl;
667 u8 pi, cmd;
668
669 pi = shpc_readb(ctrl, PROG_INTERFACE);
670 if ((pi == 1) && (value > PCI_SPEED_133MHz_PCIX))
671 return -EINVAL;
672
673 switch (value) {
674 case PCI_SPEED_33MHz:
675 cmd = SETA_PCI_33MHZ;
676 break;
677 case PCI_SPEED_66MHz:
678 cmd = SETA_PCI_66MHZ;
679 break;
680 case PCI_SPEED_66MHz_PCIX:
681 cmd = SETA_PCIX_66MHZ;
682 break;
683 case PCI_SPEED_100MHz_PCIX:
684 cmd = SETA_PCIX_100MHZ;
685 break;
686 case PCI_SPEED_133MHz_PCIX:
687 cmd = SETA_PCIX_133MHZ;
688 break;
689 case PCI_SPEED_66MHz_PCIX_ECC:
690 cmd = SETB_PCIX_66MHZ_EM;
691 break;
692 case PCI_SPEED_100MHz_PCIX_ECC:
693 cmd = SETB_PCIX_100MHZ_EM;
694 break;
695 case PCI_SPEED_133MHz_PCIX_ECC:
696 cmd = SETB_PCIX_133MHZ_EM;
697 break;
698 case PCI_SPEED_66MHz_PCIX_266:
699 cmd = SETB_PCIX_66MHZ_266;
700 break;
701 case PCI_SPEED_100MHz_PCIX_266:
702 cmd = SETB_PCIX_100MHZ_266;
703 break;
704 case PCI_SPEED_133MHz_PCIX_266:
705 cmd = SETB_PCIX_133MHZ_266;
706 break;
707 case PCI_SPEED_66MHz_PCIX_533:
708 cmd = SETB_PCIX_66MHZ_533;
709 break;
710 case PCI_SPEED_100MHz_PCIX_533:
711 cmd = SETB_PCIX_100MHZ_533;
712 break;
713 case PCI_SPEED_133MHz_PCIX_533:
714 cmd = SETB_PCIX_133MHZ_533;
715 break;
716 default:
717 return -EINVAL;
718 }
719
720 retval = shpc_write_cmd(slot, 0, cmd);
721 if (retval)
722 err("%s: Write command failed!\n", __FUNCTION__);
723
724 return retval;
725 }
726
727 static irqreturn_t shpc_isr(int irq, void *dev_id)
728 {
729 struct controller *ctrl = (struct controller *)dev_id;
730 u32 serr_int, slot_reg, intr_loc, intr_loc2;
731 int hp_slot;
732
733 /* Check to see if it was our interrupt */
734 intr_loc = shpc_readl(ctrl, INTR_LOC);
735 if (!intr_loc)
736 return IRQ_NONE;
737
738 dbg("%s: intr_loc = %x\n",__FUNCTION__, intr_loc);
739
740 if(!shpchp_poll_mode) {
741 /*
742 * Mask Global Interrupt Mask - see implementation
743 * note on p. 139 of SHPC spec rev 1.0
744 */
745 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
746 serr_int |= GLOBAL_INTR_MASK;
747 serr_int &= ~SERR_INTR_RSVDZ_MASK;
748 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
749
750 intr_loc2 = shpc_readl(ctrl, INTR_LOC);
751 dbg("%s: intr_loc2 = %x\n",__FUNCTION__, intr_loc2);
752 }
753
754 if (intr_loc & CMD_INTR_PENDING) {
755 /*
756 * Command Complete Interrupt Pending
757 * RO only - clear by writing 1 to the Command Completion
758 * Detect bit in Controller SERR-INT register
759 */
760 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
761 serr_int &= ~SERR_INTR_RSVDZ_MASK;
762 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
763
764 wake_up_interruptible(&ctrl->queue);
765 }
766
767 if (!(intr_loc & ~CMD_INTR_PENDING))
768 goto out;
769
770 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
771 /* To find out which slot has interrupt pending */
772 if (!(intr_loc & SLOT_INTR_PENDING(hp_slot)))
773 continue;
774
775 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
776 dbg("%s: Slot %x with intr, slot register = %x\n",
777 __FUNCTION__, hp_slot, slot_reg);
778
779 if (slot_reg & MRL_CHANGE_DETECTED)
780 shpchp_handle_switch_change(hp_slot, ctrl);
781
782 if (slot_reg & BUTTON_PRESS_DETECTED)
783 shpchp_handle_attention_button(hp_slot, ctrl);
784
785 if (slot_reg & PRSNT_CHANGE_DETECTED)
786 shpchp_handle_presence_change(hp_slot, ctrl);
787
788 if (slot_reg & (ISO_PFAULT_DETECTED | CON_PFAULT_DETECTED))
789 shpchp_handle_power_fault(hp_slot, ctrl);
790
791 /* Clear all slot events */
792 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
793 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
794 }
795 out:
796 if (!shpchp_poll_mode) {
797 /* Unmask Global Interrupt Mask */
798 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
799 serr_int &= ~(GLOBAL_INTR_MASK | SERR_INTR_RSVDZ_MASK);
800 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
801 }
802
803 return IRQ_HANDLED;
804 }
805
806 static int hpc_get_max_bus_speed (struct slot *slot, enum pci_bus_speed *value)
807 {
808 int retval = 0;
809 struct controller *ctrl = slot->ctrl;
810 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
811 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
812 u32 slot_avail1 = shpc_readl(ctrl, SLOT_AVAIL1);
813 u32 slot_avail2 = shpc_readl(ctrl, SLOT_AVAIL2);
814
815 if (pi == 2) {
816 if (slot_avail2 & SLOT_133MHZ_PCIX_533)
817 bus_speed = PCI_SPEED_133MHz_PCIX_533;
818 else if (slot_avail2 & SLOT_100MHZ_PCIX_533)
819 bus_speed = PCI_SPEED_100MHz_PCIX_533;
820 else if (slot_avail2 & SLOT_66MHZ_PCIX_533)
821 bus_speed = PCI_SPEED_66MHz_PCIX_533;
822 else if (slot_avail2 & SLOT_133MHZ_PCIX_266)
823 bus_speed = PCI_SPEED_133MHz_PCIX_266;
824 else if (slot_avail2 & SLOT_100MHZ_PCIX_266)
825 bus_speed = PCI_SPEED_100MHz_PCIX_266;
826 else if (slot_avail2 & SLOT_66MHZ_PCIX_266)
827 bus_speed = PCI_SPEED_66MHz_PCIX_266;
828 }
829
830 if (bus_speed == PCI_SPEED_UNKNOWN) {
831 if (slot_avail1 & SLOT_133MHZ_PCIX)
832 bus_speed = PCI_SPEED_133MHz_PCIX;
833 else if (slot_avail1 & SLOT_100MHZ_PCIX)
834 bus_speed = PCI_SPEED_100MHz_PCIX;
835 else if (slot_avail1 & SLOT_66MHZ_PCIX)
836 bus_speed = PCI_SPEED_66MHz_PCIX;
837 else if (slot_avail2 & SLOT_66MHZ)
838 bus_speed = PCI_SPEED_66MHz;
839 else if (slot_avail1 & SLOT_33MHZ)
840 bus_speed = PCI_SPEED_33MHz;
841 else
842 retval = -ENODEV;
843 }
844
845 *value = bus_speed;
846 dbg("Max bus speed = %d\n", bus_speed);
847
848 return retval;
849 }
850
851 static int hpc_get_cur_bus_speed (struct slot *slot, enum pci_bus_speed *value)
852 {
853 int retval = 0;
854 struct controller *ctrl = slot->ctrl;
855 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
856 u16 sec_bus_reg = shpc_readw(ctrl, SEC_BUS_CONFIG);
857 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
858 u8 speed_mode = (pi == 2) ? (sec_bus_reg & 0xF) : (sec_bus_reg & 0x7);
859
860 if ((pi == 1) && (speed_mode > 4)) {
861 *value = PCI_SPEED_UNKNOWN;
862 return -ENODEV;
863 }
864
865 switch (speed_mode) {
866 case 0x0:
867 *value = PCI_SPEED_33MHz;
868 break;
869 case 0x1:
870 *value = PCI_SPEED_66MHz;
871 break;
872 case 0x2:
873 *value = PCI_SPEED_66MHz_PCIX;
874 break;
875 case 0x3:
876 *value = PCI_SPEED_100MHz_PCIX;
877 break;
878 case 0x4:
879 *value = PCI_SPEED_133MHz_PCIX;
880 break;
881 case 0x5:
882 *value = PCI_SPEED_66MHz_PCIX_ECC;
883 break;
884 case 0x6:
885 *value = PCI_SPEED_100MHz_PCIX_ECC;
886 break;
887 case 0x7:
888 *value = PCI_SPEED_133MHz_PCIX_ECC;
889 break;
890 case 0x8:
891 *value = PCI_SPEED_66MHz_PCIX_266;
892 break;
893 case 0x9:
894 *value = PCI_SPEED_100MHz_PCIX_266;
895 break;
896 case 0xa:
897 *value = PCI_SPEED_133MHz_PCIX_266;
898 break;
899 case 0xb:
900 *value = PCI_SPEED_66MHz_PCIX_533;
901 break;
902 case 0xc:
903 *value = PCI_SPEED_100MHz_PCIX_533;
904 break;
905 case 0xd:
906 *value = PCI_SPEED_133MHz_PCIX_533;
907 break;
908 default:
909 *value = PCI_SPEED_UNKNOWN;
910 retval = -ENODEV;
911 break;
912 }
913
914 dbg("Current bus speed = %d\n", bus_speed);
915 return retval;
916 }
917
918 static struct hpc_ops shpchp_hpc_ops = {
919 .power_on_slot = hpc_power_on_slot,
920 .slot_enable = hpc_slot_enable,
921 .slot_disable = hpc_slot_disable,
922 .set_bus_speed_mode = hpc_set_bus_speed_mode,
923 .set_attention_status = hpc_set_attention_status,
924 .get_power_status = hpc_get_power_status,
925 .get_attention_status = hpc_get_attention_status,
926 .get_latch_status = hpc_get_latch_status,
927 .get_adapter_status = hpc_get_adapter_status,
928
929 .get_max_bus_speed = hpc_get_max_bus_speed,
930 .get_cur_bus_speed = hpc_get_cur_bus_speed,
931 .get_adapter_speed = hpc_get_adapter_speed,
932 .get_mode1_ECC_cap = hpc_get_mode1_ECC_cap,
933 .get_prog_int = hpc_get_prog_int,
934
935 .query_power_fault = hpc_query_power_fault,
936 .green_led_on = hpc_set_green_led_on,
937 .green_led_off = hpc_set_green_led_off,
938 .green_led_blink = hpc_set_green_led_blink,
939
940 .release_ctlr = hpc_release_ctlr,
941 };
942
943 int shpc_init(struct controller *ctrl, struct pci_dev *pdev)
944 {
945 int rc = -1, num_slots = 0;
946 u8 hp_slot;
947 u32 shpc_base_offset;
948 u32 tempdword, slot_reg, slot_config;
949 u8 i;
950
951 ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */
952
953 if ((pdev->vendor == PCI_VENDOR_ID_AMD) || (pdev->device ==
954 PCI_DEVICE_ID_AMD_GOLAM_7450)) {
955 /* amd shpc driver doesn't use Base Offset; assume 0 */
956 ctrl->mmio_base = pci_resource_start(pdev, 0);
957 ctrl->mmio_size = pci_resource_len(pdev, 0);
958 } else {
959 ctrl->cap_offset = pci_find_capability(pdev, PCI_CAP_ID_SHPC);
960 if (!ctrl->cap_offset) {
961 err("%s : cap_offset == 0\n", __FUNCTION__);
962 goto abort;
963 }
964 dbg("%s: cap_offset = %x\n", __FUNCTION__, ctrl->cap_offset);
965
966 rc = shpc_indirect_read(ctrl, 0, &shpc_base_offset);
967 if (rc) {
968 err("%s: cannot read base_offset\n", __FUNCTION__);
969 goto abort;
970 }
971
972 rc = shpc_indirect_read(ctrl, 3, &tempdword);
973 if (rc) {
974 err("%s: cannot read slot config\n", __FUNCTION__);
975 goto abort;
976 }
977 num_slots = tempdword & SLOT_NUM;
978 dbg("%s: num_slots (indirect) %x\n", __FUNCTION__, num_slots);
979
980 for (i = 0; i < 9 + num_slots; i++) {
981 rc = shpc_indirect_read(ctrl, i, &tempdword);
982 if (rc) {
983 err("%s: cannot read creg (index = %d)\n",
984 __FUNCTION__, i);
985 goto abort;
986 }
987 dbg("%s: offset %d: value %x\n", __FUNCTION__,i,
988 tempdword);
989 }
990
991 ctrl->mmio_base =
992 pci_resource_start(pdev, 0) + shpc_base_offset;
993 ctrl->mmio_size = 0x24 + 0x4 * num_slots;
994 }
995
996 info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n", pdev->vendor, pdev->device, pdev->subsystem_vendor,
997 pdev->subsystem_device);
998
999 rc = pci_enable_device(pdev);
1000 if (rc) {
1001 err("%s: pci_enable_device failed\n", __FUNCTION__);
1002 goto abort;
1003 }
1004
1005 if (!request_mem_region(ctrl->mmio_base, ctrl->mmio_size, MY_NAME)) {
1006 err("%s: cannot reserve MMIO region\n", __FUNCTION__);
1007 rc = -1;
1008 goto abort;
1009 }
1010
1011 ctrl->creg = ioremap(ctrl->mmio_base, ctrl->mmio_size);
1012 if (!ctrl->creg) {
1013 err("%s: cannot remap MMIO region %lx @ %lx\n", __FUNCTION__,
1014 ctrl->mmio_size, ctrl->mmio_base);
1015 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
1016 rc = -1;
1017 goto abort;
1018 }
1019 dbg("%s: ctrl->creg %p\n", __FUNCTION__, ctrl->creg);
1020
1021 mutex_init(&ctrl->crit_sect);
1022 mutex_init(&ctrl->cmd_lock);
1023
1024 /* Setup wait queue */
1025 init_waitqueue_head(&ctrl->queue);
1026
1027 ctrl->hpc_ops = &shpchp_hpc_ops;
1028
1029 /* Return PCI Controller Info */
1030 slot_config = shpc_readl(ctrl, SLOT_CONFIG);
1031 ctrl->slot_device_offset = (slot_config & FIRST_DEV_NUM) >> 8;
1032 ctrl->num_slots = slot_config & SLOT_NUM;
1033 ctrl->first_slot = (slot_config & PSN) >> 16;
1034 ctrl->slot_num_inc = ((slot_config & UPDOWN) >> 29) ? 1 : -1;
1035
1036 /* Mask Global Interrupt Mask & Command Complete Interrupt Mask */
1037 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1038 dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword);
1039 tempdword |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
1040 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
1041 tempdword &= ~SERR_INTR_RSVDZ_MASK;
1042 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
1043 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1044 dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword);
1045
1046 /* Mask the MRL sensor SERR Mask of individual slot in
1047 * Slot SERR-INT Mask & clear all the existing event if any
1048 */
1049 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1050 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1051 dbg("%s: Default Logical Slot Register %d value %x\n", __FUNCTION__,
1052 hp_slot, slot_reg);
1053 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1054 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1055 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
1056 CON_PFAULT_SERR_MASK);
1057 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
1058 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1059 }
1060
1061 if (shpchp_poll_mode) {
1062 /* Install interrupt polling timer. Start with 10 sec delay */
1063 init_timer(&ctrl->poll_timer);
1064 start_int_poll_timer(ctrl, 10);
1065 } else {
1066 /* Installs the interrupt handler */
1067 rc = pci_enable_msi(pdev);
1068 if (rc) {
1069 info("Can't get msi for the hotplug controller\n");
1070 info("Use INTx for the hotplug controller\n");
1071 }
1072
1073 rc = request_irq(ctrl->pci_dev->irq, shpc_isr, IRQF_SHARED,
1074 MY_NAME, (void *)ctrl);
1075 dbg("%s: request_irq %d for hpc%d (returns %d)\n",
1076 __FUNCTION__, ctrl->pci_dev->irq,
1077 atomic_read(&shpchp_num_controllers), rc);
1078 if (rc) {
1079 err("Can't get irq %d for the hotplug controller\n",
1080 ctrl->pci_dev->irq);
1081 goto abort_iounmap;
1082 }
1083 }
1084 dbg("%s: HPC at b:d:f:irq=0x%x:%x:%x:%x\n", __FUNCTION__,
1085 pdev->bus->number, PCI_SLOT(pdev->devfn),
1086 PCI_FUNC(pdev->devfn), pdev->irq);
1087 get_hp_hw_control_from_firmware(pdev);
1088
1089 /*
1090 * If this is the first controller to be initialized,
1091 * initialize the shpchpd work queue
1092 */
1093 if (atomic_add_return(1, &shpchp_num_controllers) == 1) {
1094 shpchp_wq = create_singlethread_workqueue("shpchpd");
1095 if (!shpchp_wq) {
1096 rc = -ENOMEM;
1097 goto abort_iounmap;
1098 }
1099 }
1100
1101 /*
1102 * Unmask all event interrupts of all slots
1103 */
1104 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1105 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1106 dbg("%s: Default Logical Slot Register %d value %x\n", __FUNCTION__,
1107 hp_slot, slot_reg);
1108 slot_reg &= ~(PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1109 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1110 CON_PFAULT_INTR_MASK | SLOT_REG_RSVDZ_MASK);
1111 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1112 }
1113 if (!shpchp_poll_mode) {
1114 /* Unmask all general input interrupts and SERR */
1115 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1116 tempdword &= ~(GLOBAL_INTR_MASK | COMMAND_INTR_MASK |
1117 SERR_INTR_RSVDZ_MASK);
1118 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
1119 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1120 dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword);
1121 }
1122
1123 return 0;
1124
1125 /* We end up here for the many possible ways to fail this API. */
1126 abort_iounmap:
1127 iounmap(ctrl->creg);
1128 abort:
1129 return rc;
1130 }
Linux kernel - Deliverables
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