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[mirror_ubuntu-bionic-kernel.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 definitions
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 irqreturn_t shpc_isr(int irq, void *dev_id);
183 static void start_int_poll_timer(struct controller *ctrl, int sec);
184 static int hpc_check_cmd_status(struct controller *ctrl);
185
186 static inline u8 shpc_readb(struct controller *ctrl, int reg)
187 {
188 return readb(ctrl->creg + reg);
189 }
190
191 static inline void shpc_writeb(struct controller *ctrl, int reg, u8 val)
192 {
193 writeb(val, ctrl->creg + reg);
194 }
195
196 static inline u16 shpc_readw(struct controller *ctrl, int reg)
197 {
198 return readw(ctrl->creg + reg);
199 }
200
201 static inline void shpc_writew(struct controller *ctrl, int reg, u16 val)
202 {
203 writew(val, ctrl->creg + reg);
204 }
205
206 static inline u32 shpc_readl(struct controller *ctrl, int reg)
207 {
208 return readl(ctrl->creg + reg);
209 }
210
211 static inline void shpc_writel(struct controller *ctrl, int reg, u32 val)
212 {
213 writel(val, ctrl->creg + reg);
214 }
215
216 static inline int shpc_indirect_read(struct controller *ctrl, int index,
217 u32 *value)
218 {
219 int rc;
220 u32 cap_offset = ctrl->cap_offset;
221 struct pci_dev *pdev = ctrl->pci_dev;
222
223 rc = pci_write_config_byte(pdev, cap_offset + DWORD_SELECT, index);
224 if (rc)
225 return rc;
226 return pci_read_config_dword(pdev, cap_offset + DWORD_DATA, value);
227 }
228
229 /*
230 * This is the interrupt polling timeout function.
231 */
232 static void int_poll_timeout(unsigned long data)
233 {
234 struct controller *ctrl = (struct controller *)data;
235
236 /* Poll for interrupt events. regs == NULL => polling */
237 shpc_isr(0, ctrl);
238
239 init_timer(&ctrl->poll_timer);
240 if (!shpchp_poll_time)
241 shpchp_poll_time = 2; /* default polling interval is 2 sec */
242
243 start_int_poll_timer(ctrl, shpchp_poll_time);
244 }
245
246 /*
247 * This function starts the interrupt polling timer.
248 */
249 static void start_int_poll_timer(struct controller *ctrl, int sec)
250 {
251 /* Clamp to sane value */
252 if ((sec <= 0) || (sec > 60))
253 sec = 2;
254
255 ctrl->poll_timer.function = &int_poll_timeout;
256 ctrl->poll_timer.data = (unsigned long)ctrl;
257 ctrl->poll_timer.expires = jiffies + sec * HZ;
258 add_timer(&ctrl->poll_timer);
259 }
260
261 static inline int is_ctrl_busy(struct controller *ctrl)
262 {
263 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS);
264 return cmd_status & 0x1;
265 }
266
267 /*
268 * Returns 1 if SHPC finishes executing a command within 1 sec,
269 * otherwise returns 0.
270 */
271 static inline int shpc_poll_ctrl_busy(struct controller *ctrl)
272 {
273 int i;
274
275 if (!is_ctrl_busy(ctrl))
276 return 1;
277
278 /* Check every 0.1 sec for a total of 1 sec */
279 for (i = 0; i < 10; i++) {
280 msleep(100);
281 if (!is_ctrl_busy(ctrl))
282 return 1;
283 }
284
285 return 0;
286 }
287
288 static inline int shpc_wait_cmd(struct controller *ctrl)
289 {
290 int retval = 0;
291 unsigned long timeout = msecs_to_jiffies(1000);
292 int rc;
293
294 if (shpchp_poll_mode)
295 rc = shpc_poll_ctrl_busy(ctrl);
296 else
297 rc = wait_event_interruptible_timeout(ctrl->queue,
298 !is_ctrl_busy(ctrl), timeout);
299 if (!rc && is_ctrl_busy(ctrl)) {
300 retval = -EIO;
301 ctrl_err(ctrl, "Command not completed in 1000 msec\n");
302 } else if (rc < 0) {
303 retval = -EINTR;
304 ctrl_info(ctrl, "Command was interrupted by a signal\n");
305 }
306
307 return retval;
308 }
309
310 static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
311 {
312 struct controller *ctrl = slot->ctrl;
313 u16 cmd_status;
314 int retval = 0;
315 u16 temp_word;
316
317 mutex_lock(&slot->ctrl->cmd_lock);
318
319 if (!shpc_poll_ctrl_busy(ctrl)) {
320 /* After 1 sec and and the controller is still busy */
321 ctrl_err(ctrl, "Controller is still busy after 1 sec\n");
322 retval = -EBUSY;
323 goto out;
324 }
325
326 ++t_slot;
327 temp_word = (t_slot << 8) | (cmd & 0xFF);
328 ctrl_dbg(ctrl, "%s: t_slot %x cmd %x\n", __func__, t_slot, cmd);
329
330 /* To make sure the Controller Busy bit is 0 before we send out the
331 * command.
332 */
333 shpc_writew(ctrl, CMD, temp_word);
334
335 /*
336 * Wait for command completion.
337 */
338 retval = shpc_wait_cmd(slot->ctrl);
339 if (retval)
340 goto out;
341
342 cmd_status = hpc_check_cmd_status(slot->ctrl);
343 if (cmd_status) {
344 ctrl_err(ctrl,
345 "Failed to issued command 0x%x (error code = %d)\n",
346 cmd, cmd_status);
347 retval = -EIO;
348 }
349 out:
350 mutex_unlock(&slot->ctrl->cmd_lock);
351 return retval;
352 }
353
354 static int hpc_check_cmd_status(struct controller *ctrl)
355 {
356 int retval = 0;
357 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS) & 0x000F;
358
359 switch (cmd_status >> 1) {
360 case 0:
361 retval = 0;
362 break;
363 case 1:
364 retval = SWITCH_OPEN;
365 ctrl_err(ctrl, "Switch opened!\n");
366 break;
367 case 2:
368 retval = INVALID_CMD;
369 ctrl_err(ctrl, "Invalid HPC command!\n");
370 break;
371 case 4:
372 retval = INVALID_SPEED_MODE;
373 ctrl_err(ctrl, "Invalid bus speed/mode!\n");
374 break;
375 default:
376 retval = cmd_status;
377 }
378
379 return retval;
380 }
381
382
383 static int hpc_get_attention_status(struct slot *slot, u8 *status)
384 {
385 struct controller *ctrl = slot->ctrl;
386 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
387 u8 state = (slot_reg & ATN_LED_STATE_MASK) >> ATN_LED_STATE_SHIFT;
388
389 switch (state) {
390 case ATN_LED_STATE_ON:
391 *status = 1; /* On */
392 break;
393 case ATN_LED_STATE_BLINK:
394 *status = 2; /* Blink */
395 break;
396 case ATN_LED_STATE_OFF:
397 *status = 0; /* Off */
398 break;
399 default:
400 *status = 0xFF; /* Reserved */
401 break;
402 }
403
404 return 0;
405 }
406
407 static int hpc_get_power_status(struct slot * slot, u8 *status)
408 {
409 struct controller *ctrl = slot->ctrl;
410 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
411 u8 state = (slot_reg & SLOT_STATE_MASK) >> SLOT_STATE_SHIFT;
412
413 switch (state) {
414 case SLOT_STATE_PWRONLY:
415 *status = 2; /* Powered only */
416 break;
417 case SLOT_STATE_ENABLED:
418 *status = 1; /* Enabled */
419 break;
420 case SLOT_STATE_DISABLED:
421 *status = 0; /* Disabled */
422 break;
423 default:
424 *status = 0xFF; /* Reserved */
425 break;
426 }
427
428 return 0;
429 }
430
431
432 static int hpc_get_latch_status(struct slot *slot, u8 *status)
433 {
434 struct controller *ctrl = slot->ctrl;
435 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
436
437 *status = !!(slot_reg & MRL_SENSOR); /* 0 -> close; 1 -> open */
438
439 return 0;
440 }
441
442 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
443 {
444 struct controller *ctrl = slot->ctrl;
445 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
446 u8 state = (slot_reg & PRSNT_MASK) >> PRSNT_SHIFT;
447
448 *status = (state != 0x3) ? 1 : 0;
449
450 return 0;
451 }
452
453 static int hpc_get_prog_int(struct slot *slot, u8 *prog_int)
454 {
455 struct controller *ctrl = slot->ctrl;
456
457 *prog_int = shpc_readb(ctrl, PROG_INTERFACE);
458
459 return 0;
460 }
461
462 static int hpc_get_adapter_speed(struct slot *slot, enum pci_bus_speed *value)
463 {
464 int retval = 0;
465 struct controller *ctrl = slot->ctrl;
466 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
467 u8 m66_cap = !!(slot_reg & MHZ66_CAP);
468 u8 pi, pcix_cap;
469
470 if ((retval = hpc_get_prog_int(slot, &pi)))
471 return retval;
472
473 switch (pi) {
474 case 1:
475 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI1) >> PCIX_CAP_SHIFT;
476 break;
477 case 2:
478 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI2) >> PCIX_CAP_SHIFT;
479 break;
480 default:
481 return -ENODEV;
482 }
483
484 ctrl_dbg(ctrl, "%s: slot_reg = %x, pcix_cap = %x, m66_cap = %x\n",
485 __func__, slot_reg, pcix_cap, m66_cap);
486
487 switch (pcix_cap) {
488 case 0x0:
489 *value = m66_cap ? PCI_SPEED_66MHz : PCI_SPEED_33MHz;
490 break;
491 case 0x1:
492 *value = PCI_SPEED_66MHz_PCIX;
493 break;
494 case 0x3:
495 *value = PCI_SPEED_133MHz_PCIX;
496 break;
497 case 0x4:
498 *value = PCI_SPEED_133MHz_PCIX_266;
499 break;
500 case 0x5:
501 *value = PCI_SPEED_133MHz_PCIX_533;
502 break;
503 case 0x2:
504 default:
505 *value = PCI_SPEED_UNKNOWN;
506 retval = -ENODEV;
507 break;
508 }
509
510 ctrl_dbg(ctrl, "Adapter speed = %d\n", *value);
511 return retval;
512 }
513
514 static int hpc_get_mode1_ECC_cap(struct slot *slot, u8 *mode)
515 {
516 int retval = 0;
517 struct controller *ctrl = slot->ctrl;
518 u16 sec_bus_status = shpc_readw(ctrl, SEC_BUS_CONFIG);
519 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
520
521 if (pi == 2) {
522 *mode = (sec_bus_status & 0x0100) >> 8;
523 } else {
524 retval = -1;
525 }
526
527 ctrl_dbg(ctrl, "Mode 1 ECC cap = %d\n", *mode);
528 return retval;
529 }
530
531 static int hpc_query_power_fault(struct slot * slot)
532 {
533 struct controller *ctrl = slot->ctrl;
534 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
535
536 /* Note: Logic 0 => fault */
537 return !(slot_reg & POWER_FAULT);
538 }
539
540 static int hpc_set_attention_status(struct slot *slot, u8 value)
541 {
542 u8 slot_cmd = 0;
543
544 switch (value) {
545 case 0 :
546 slot_cmd = SET_ATTN_OFF; /* OFF */
547 break;
548 case 1:
549 slot_cmd = SET_ATTN_ON; /* ON */
550 break;
551 case 2:
552 slot_cmd = SET_ATTN_BLINK; /* BLINK */
553 break;
554 default:
555 return -1;
556 }
557
558 return shpc_write_cmd(slot, slot->hp_slot, slot_cmd);
559 }
560
561
562 static void hpc_set_green_led_on(struct slot *slot)
563 {
564 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_ON);
565 }
566
567 static void hpc_set_green_led_off(struct slot *slot)
568 {
569 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_OFF);
570 }
571
572 static void hpc_set_green_led_blink(struct slot *slot)
573 {
574 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_BLINK);
575 }
576
577 static void hpc_release_ctlr(struct controller *ctrl)
578 {
579 int i;
580 u32 slot_reg, serr_int;
581
582 /*
583 * Mask event interrupts and SERRs of all slots
584 */
585 for (i = 0; i < ctrl->num_slots; i++) {
586 slot_reg = shpc_readl(ctrl, SLOT_REG(i));
587 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
588 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
589 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
590 CON_PFAULT_SERR_MASK);
591 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
592 shpc_writel(ctrl, SLOT_REG(i), slot_reg);
593 }
594
595 cleanup_slots(ctrl);
596
597 /*
598 * Mask SERR and System Interrupt generation
599 */
600 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
601 serr_int |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
602 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
603 serr_int &= ~SERR_INTR_RSVDZ_MASK;
604 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
605
606 if (shpchp_poll_mode)
607 del_timer(&ctrl->poll_timer);
608 else {
609 free_irq(ctrl->pci_dev->irq, ctrl);
610 pci_disable_msi(ctrl->pci_dev);
611 }
612
613 iounmap(ctrl->creg);
614 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
615 }
616
617 static int hpc_power_on_slot(struct slot * slot)
618 {
619 int retval;
620
621 retval = shpc_write_cmd(slot, slot->hp_slot, SET_SLOT_PWR);
622 if (retval)
623 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
624
625 return retval;
626 }
627
628 static int hpc_slot_enable(struct slot * slot)
629 {
630 int retval;
631
632 /* Slot - Enable, Power Indicator - Blink, Attention Indicator - Off */
633 retval = shpc_write_cmd(slot, slot->hp_slot,
634 SET_SLOT_ENABLE | SET_PWR_BLINK | SET_ATTN_OFF);
635 if (retval)
636 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
637
638 return retval;
639 }
640
641 static int hpc_slot_disable(struct slot * slot)
642 {
643 int retval;
644
645 /* Slot - Disable, Power Indicator - Off, Attention Indicator - On */
646 retval = shpc_write_cmd(slot, slot->hp_slot,
647 SET_SLOT_DISABLE | SET_PWR_OFF | SET_ATTN_ON);
648 if (retval)
649 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
650
651 return retval;
652 }
653
654 static int shpc_get_cur_bus_speed(struct controller *ctrl)
655 {
656 int retval = 0;
657 struct pci_bus *bus = ctrl->pci_dev->subordinate;
658 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
659 u16 sec_bus_reg = shpc_readw(ctrl, SEC_BUS_CONFIG);
660 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
661 u8 speed_mode = (pi == 2) ? (sec_bus_reg & 0xF) : (sec_bus_reg & 0x7);
662
663 if ((pi == 1) && (speed_mode > 4)) {
664 retval = -ENODEV;
665 goto out;
666 }
667
668 switch (speed_mode) {
669 case 0x0:
670 bus_speed = PCI_SPEED_33MHz;
671 break;
672 case 0x1:
673 bus_speed = PCI_SPEED_66MHz;
674 break;
675 case 0x2:
676 bus_speed = PCI_SPEED_66MHz_PCIX;
677 break;
678 case 0x3:
679 bus_speed = PCI_SPEED_100MHz_PCIX;
680 break;
681 case 0x4:
682 bus_speed = PCI_SPEED_133MHz_PCIX;
683 break;
684 case 0x5:
685 bus_speed = PCI_SPEED_66MHz_PCIX_ECC;
686 break;
687 case 0x6:
688 bus_speed = PCI_SPEED_100MHz_PCIX_ECC;
689 break;
690 case 0x7:
691 bus_speed = PCI_SPEED_133MHz_PCIX_ECC;
692 break;
693 case 0x8:
694 bus_speed = PCI_SPEED_66MHz_PCIX_266;
695 break;
696 case 0x9:
697 bus_speed = PCI_SPEED_100MHz_PCIX_266;
698 break;
699 case 0xa:
700 bus_speed = PCI_SPEED_133MHz_PCIX_266;
701 break;
702 case 0xb:
703 bus_speed = PCI_SPEED_66MHz_PCIX_533;
704 break;
705 case 0xc:
706 bus_speed = PCI_SPEED_100MHz_PCIX_533;
707 break;
708 case 0xd:
709 bus_speed = PCI_SPEED_133MHz_PCIX_533;
710 break;
711 default:
712 retval = -ENODEV;
713 break;
714 }
715
716 out:
717 bus->cur_bus_speed = bus_speed;
718 dbg("Current bus speed = %d\n", bus_speed);
719 return retval;
720 }
721
722
723 static int hpc_set_bus_speed_mode(struct slot * slot, enum pci_bus_speed value)
724 {
725 int retval;
726 struct controller *ctrl = slot->ctrl;
727 u8 pi, cmd;
728
729 pi = shpc_readb(ctrl, PROG_INTERFACE);
730 if ((pi == 1) && (value > PCI_SPEED_133MHz_PCIX))
731 return -EINVAL;
732
733 switch (value) {
734 case PCI_SPEED_33MHz:
735 cmd = SETA_PCI_33MHZ;
736 break;
737 case PCI_SPEED_66MHz:
738 cmd = SETA_PCI_66MHZ;
739 break;
740 case PCI_SPEED_66MHz_PCIX:
741 cmd = SETA_PCIX_66MHZ;
742 break;
743 case PCI_SPEED_100MHz_PCIX:
744 cmd = SETA_PCIX_100MHZ;
745 break;
746 case PCI_SPEED_133MHz_PCIX:
747 cmd = SETA_PCIX_133MHZ;
748 break;
749 case PCI_SPEED_66MHz_PCIX_ECC:
750 cmd = SETB_PCIX_66MHZ_EM;
751 break;
752 case PCI_SPEED_100MHz_PCIX_ECC:
753 cmd = SETB_PCIX_100MHZ_EM;
754 break;
755 case PCI_SPEED_133MHz_PCIX_ECC:
756 cmd = SETB_PCIX_133MHZ_EM;
757 break;
758 case PCI_SPEED_66MHz_PCIX_266:
759 cmd = SETB_PCIX_66MHZ_266;
760 break;
761 case PCI_SPEED_100MHz_PCIX_266:
762 cmd = SETB_PCIX_100MHZ_266;
763 break;
764 case PCI_SPEED_133MHz_PCIX_266:
765 cmd = SETB_PCIX_133MHZ_266;
766 break;
767 case PCI_SPEED_66MHz_PCIX_533:
768 cmd = SETB_PCIX_66MHZ_533;
769 break;
770 case PCI_SPEED_100MHz_PCIX_533:
771 cmd = SETB_PCIX_100MHZ_533;
772 break;
773 case PCI_SPEED_133MHz_PCIX_533:
774 cmd = SETB_PCIX_133MHZ_533;
775 break;
776 default:
777 return -EINVAL;
778 }
779
780 retval = shpc_write_cmd(slot, 0, cmd);
781 if (retval)
782 ctrl_err(ctrl, "%s: Write command failed!\n", __func__);
783 else
784 shpc_get_cur_bus_speed(ctrl);
785
786 return retval;
787 }
788
789 static irqreturn_t shpc_isr(int irq, void *dev_id)
790 {
791 struct controller *ctrl = (struct controller *)dev_id;
792 u32 serr_int, slot_reg, intr_loc, intr_loc2;
793 int hp_slot;
794
795 /* Check to see if it was our interrupt */
796 intr_loc = shpc_readl(ctrl, INTR_LOC);
797 if (!intr_loc)
798 return IRQ_NONE;
799
800 ctrl_dbg(ctrl, "%s: intr_loc = %x\n", __func__, intr_loc);
801
802 if(!shpchp_poll_mode) {
803 /*
804 * Mask Global Interrupt Mask - see implementation
805 * note on p. 139 of SHPC spec rev 1.0
806 */
807 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
808 serr_int |= GLOBAL_INTR_MASK;
809 serr_int &= ~SERR_INTR_RSVDZ_MASK;
810 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
811
812 intr_loc2 = shpc_readl(ctrl, INTR_LOC);
813 ctrl_dbg(ctrl, "%s: intr_loc2 = %x\n", __func__, intr_loc2);
814 }
815
816 if (intr_loc & CMD_INTR_PENDING) {
817 /*
818 * Command Complete Interrupt Pending
819 * RO only - clear by writing 1 to the Command Completion
820 * Detect bit in Controller SERR-INT register
821 */
822 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
823 serr_int &= ~SERR_INTR_RSVDZ_MASK;
824 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
825
826 wake_up_interruptible(&ctrl->queue);
827 }
828
829 if (!(intr_loc & ~CMD_INTR_PENDING))
830 goto out;
831
832 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
833 /* To find out which slot has interrupt pending */
834 if (!(intr_loc & SLOT_INTR_PENDING(hp_slot)))
835 continue;
836
837 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
838 ctrl_dbg(ctrl, "Slot %x with intr, slot register = %x\n",
839 hp_slot, slot_reg);
840
841 if (slot_reg & MRL_CHANGE_DETECTED)
842 shpchp_handle_switch_change(hp_slot, ctrl);
843
844 if (slot_reg & BUTTON_PRESS_DETECTED)
845 shpchp_handle_attention_button(hp_slot, ctrl);
846
847 if (slot_reg & PRSNT_CHANGE_DETECTED)
848 shpchp_handle_presence_change(hp_slot, ctrl);
849
850 if (slot_reg & (ISO_PFAULT_DETECTED | CON_PFAULT_DETECTED))
851 shpchp_handle_power_fault(hp_slot, ctrl);
852
853 /* Clear all slot events */
854 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
855 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
856 }
857 out:
858 if (!shpchp_poll_mode) {
859 /* Unmask Global Interrupt Mask */
860 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
861 serr_int &= ~(GLOBAL_INTR_MASK | SERR_INTR_RSVDZ_MASK);
862 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
863 }
864
865 return IRQ_HANDLED;
866 }
867
868 static int shpc_get_max_bus_speed(struct controller *ctrl)
869 {
870 int retval = 0;
871 struct pci_bus *bus = ctrl->pci_dev->subordinate;
872 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
873 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
874 u32 slot_avail1 = shpc_readl(ctrl, SLOT_AVAIL1);
875 u32 slot_avail2 = shpc_readl(ctrl, SLOT_AVAIL2);
876
877 if (pi == 2) {
878 if (slot_avail2 & SLOT_133MHZ_PCIX_533)
879 bus_speed = PCI_SPEED_133MHz_PCIX_533;
880 else if (slot_avail2 & SLOT_100MHZ_PCIX_533)
881 bus_speed = PCI_SPEED_100MHz_PCIX_533;
882 else if (slot_avail2 & SLOT_66MHZ_PCIX_533)
883 bus_speed = PCI_SPEED_66MHz_PCIX_533;
884 else if (slot_avail2 & SLOT_133MHZ_PCIX_266)
885 bus_speed = PCI_SPEED_133MHz_PCIX_266;
886 else if (slot_avail2 & SLOT_100MHZ_PCIX_266)
887 bus_speed = PCI_SPEED_100MHz_PCIX_266;
888 else if (slot_avail2 & SLOT_66MHZ_PCIX_266)
889 bus_speed = PCI_SPEED_66MHz_PCIX_266;
890 }
891
892 if (bus_speed == PCI_SPEED_UNKNOWN) {
893 if (slot_avail1 & SLOT_133MHZ_PCIX)
894 bus_speed = PCI_SPEED_133MHz_PCIX;
895 else if (slot_avail1 & SLOT_100MHZ_PCIX)
896 bus_speed = PCI_SPEED_100MHz_PCIX;
897 else if (slot_avail1 & SLOT_66MHZ_PCIX)
898 bus_speed = PCI_SPEED_66MHz_PCIX;
899 else if (slot_avail2 & SLOT_66MHZ)
900 bus_speed = PCI_SPEED_66MHz;
901 else if (slot_avail1 & SLOT_33MHZ)
902 bus_speed = PCI_SPEED_33MHz;
903 else
904 retval = -ENODEV;
905 }
906
907 bus->max_bus_speed = bus_speed;
908 ctrl_dbg(ctrl, "Max bus speed = %d\n", bus_speed);
909
910 return retval;
911 }
912
913 static struct hpc_ops shpchp_hpc_ops = {
914 .power_on_slot = hpc_power_on_slot,
915 .slot_enable = hpc_slot_enable,
916 .slot_disable = hpc_slot_disable,
917 .set_bus_speed_mode = hpc_set_bus_speed_mode,
918 .set_attention_status = hpc_set_attention_status,
919 .get_power_status = hpc_get_power_status,
920 .get_attention_status = hpc_get_attention_status,
921 .get_latch_status = hpc_get_latch_status,
922 .get_adapter_status = hpc_get_adapter_status,
923
924 .get_adapter_speed = hpc_get_adapter_speed,
925 .get_mode1_ECC_cap = hpc_get_mode1_ECC_cap,
926 .get_prog_int = hpc_get_prog_int,
927
928 .query_power_fault = hpc_query_power_fault,
929 .green_led_on = hpc_set_green_led_on,
930 .green_led_off = hpc_set_green_led_off,
931 .green_led_blink = hpc_set_green_led_blink,
932
933 .release_ctlr = hpc_release_ctlr,
934 };
935
936 int shpc_init(struct controller *ctrl, struct pci_dev *pdev)
937 {
938 int rc = -1, num_slots = 0;
939 u8 hp_slot;
940 u32 shpc_base_offset;
941 u32 tempdword, slot_reg, slot_config;
942 u8 i;
943
944 ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */
945 ctrl_dbg(ctrl, "Hotplug Controller:\n");
946
947 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
948 pdev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) {
949 /* amd shpc driver doesn't use Base Offset; assume 0 */
950 ctrl->mmio_base = pci_resource_start(pdev, 0);
951 ctrl->mmio_size = pci_resource_len(pdev, 0);
952 } else {
953 ctrl->cap_offset = pci_find_capability(pdev, PCI_CAP_ID_SHPC);
954 if (!ctrl->cap_offset) {
955 ctrl_err(ctrl, "Cannot find PCI capability\n");
956 goto abort;
957 }
958 ctrl_dbg(ctrl, " cap_offset = %x\n", ctrl->cap_offset);
959
960 rc = shpc_indirect_read(ctrl, 0, &shpc_base_offset);
961 if (rc) {
962 ctrl_err(ctrl, "Cannot read base_offset\n");
963 goto abort;
964 }
965
966 rc = shpc_indirect_read(ctrl, 3, &tempdword);
967 if (rc) {
968 ctrl_err(ctrl, "Cannot read slot config\n");
969 goto abort;
970 }
971 num_slots = tempdword & SLOT_NUM;
972 ctrl_dbg(ctrl, " num_slots (indirect) %x\n", num_slots);
973
974 for (i = 0; i < 9 + num_slots; i++) {
975 rc = shpc_indirect_read(ctrl, i, &tempdword);
976 if (rc) {
977 ctrl_err(ctrl,
978 "Cannot read creg (index = %d)\n", i);
979 goto abort;
980 }
981 ctrl_dbg(ctrl, " offset %d: value %x\n", i, tempdword);
982 }
983
984 ctrl->mmio_base =
985 pci_resource_start(pdev, 0) + shpc_base_offset;
986 ctrl->mmio_size = 0x24 + 0x4 * num_slots;
987 }
988
989 ctrl_info(ctrl, "HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
990 pdev->vendor, pdev->device, pdev->subsystem_vendor,
991 pdev->subsystem_device);
992
993 rc = pci_enable_device(pdev);
994 if (rc) {
995 ctrl_err(ctrl, "pci_enable_device failed\n");
996 goto abort;
997 }
998
999 if (!request_mem_region(ctrl->mmio_base, ctrl->mmio_size, MY_NAME)) {
1000 ctrl_err(ctrl, "Cannot reserve MMIO region\n");
1001 rc = -1;
1002 goto abort;
1003 }
1004
1005 ctrl->creg = ioremap(ctrl->mmio_base, ctrl->mmio_size);
1006 if (!ctrl->creg) {
1007 ctrl_err(ctrl, "Cannot remap MMIO region %lx @ %lx\n",
1008 ctrl->mmio_size, ctrl->mmio_base);
1009 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
1010 rc = -1;
1011 goto abort;
1012 }
1013 ctrl_dbg(ctrl, "ctrl->creg %p\n", ctrl->creg);
1014
1015 mutex_init(&ctrl->crit_sect);
1016 mutex_init(&ctrl->cmd_lock);
1017
1018 /* Setup wait queue */
1019 init_waitqueue_head(&ctrl->queue);
1020
1021 ctrl->hpc_ops = &shpchp_hpc_ops;
1022
1023 /* Return PCI Controller Info */
1024 slot_config = shpc_readl(ctrl, SLOT_CONFIG);
1025 ctrl->slot_device_offset = (slot_config & FIRST_DEV_NUM) >> 8;
1026 ctrl->num_slots = slot_config & SLOT_NUM;
1027 ctrl->first_slot = (slot_config & PSN) >> 16;
1028 ctrl->slot_num_inc = ((slot_config & UPDOWN) >> 29) ? 1 : -1;
1029
1030 /* Mask Global Interrupt Mask & Command Complete Interrupt Mask */
1031 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1032 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
1033 tempdword |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
1034 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
1035 tempdword &= ~SERR_INTR_RSVDZ_MASK;
1036 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
1037 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1038 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
1039
1040 /* Mask the MRL sensor SERR Mask of individual slot in
1041 * Slot SERR-INT Mask & clear all the existing event if any
1042 */
1043 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1044 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1045 ctrl_dbg(ctrl, "Default Logical Slot Register %d value %x\n",
1046 hp_slot, slot_reg);
1047 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1048 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1049 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
1050 CON_PFAULT_SERR_MASK);
1051 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
1052 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1053 }
1054
1055 if (shpchp_poll_mode) {
1056 /* Install interrupt polling timer. Start with 10 sec delay */
1057 init_timer(&ctrl->poll_timer);
1058 start_int_poll_timer(ctrl, 10);
1059 } else {
1060 /* Installs the interrupt handler */
1061 rc = pci_enable_msi(pdev);
1062 if (rc) {
1063 ctrl_info(ctrl,
1064 "Can't get msi for the hotplug controller\n");
1065 ctrl_info(ctrl,
1066 "Use INTx for the hotplug controller\n");
1067 }
1068
1069 rc = request_irq(ctrl->pci_dev->irq, shpc_isr, IRQF_SHARED,
1070 MY_NAME, (void *)ctrl);
1071 ctrl_dbg(ctrl, "request_irq %d (returns %d)\n",
1072 ctrl->pci_dev->irq, rc);
1073 if (rc) {
1074 ctrl_err(ctrl, "Can't get irq %d for the hotplug "
1075 "controller\n", ctrl->pci_dev->irq);
1076 goto abort_iounmap;
1077 }
1078 }
1079 ctrl_dbg(ctrl, "HPC at %s irq=%x\n", pci_name(pdev), pdev->irq);
1080
1081 shpc_get_max_bus_speed(ctrl);
1082 shpc_get_cur_bus_speed(ctrl);
1083
1084 /*
1085 * Unmask all event interrupts of all slots
1086 */
1087 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1088 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1089 ctrl_dbg(ctrl, "Default Logical Slot Register %d value %x\n",
1090 hp_slot, slot_reg);
1091 slot_reg &= ~(PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1092 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1093 CON_PFAULT_INTR_MASK | SLOT_REG_RSVDZ_MASK);
1094 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1095 }
1096 if (!shpchp_poll_mode) {
1097 /* Unmask all general input interrupts and SERR */
1098 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1099 tempdword &= ~(GLOBAL_INTR_MASK | COMMAND_INTR_MASK |
1100 SERR_INTR_RSVDZ_MASK);
1101 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
1102 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1103 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
1104 }
1105
1106 return 0;
1107
1108 /* We end up here for the many possible ways to fail this API. */
1109 abort_iounmap:
1110 iounmap(ctrl->creg);
1111 abort:
1112 return rc;
1113 }
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