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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / pci / hotplug / shpchp_hpc.c
blobdb047284c2917159f2a21a661b934087af104275
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Standard PCI Hot Plug Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2003-2004 Intel Corporation
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com>
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/types.h>
19 #include <linux/pci.h>
20 #include <linux/interrupt.h>
21
22 #include "shpchp.h"
23
24 /* Slot Available Register I field definition */
25 #define SLOT_33MHZ 0x0000001f
26 #define SLOT_66MHZ_PCIX 0x00001f00
27 #define SLOT_100MHZ_PCIX 0x001f0000
28 #define SLOT_133MHZ_PCIX 0x1f000000
29
30 /* Slot Available Register II field definition */
31 #define SLOT_66MHZ 0x0000001f
32 #define SLOT_66MHZ_PCIX_266 0x00000f00
33 #define SLOT_100MHZ_PCIX_266 0x0000f000
34 #define SLOT_133MHZ_PCIX_266 0x000f0000
35 #define SLOT_66MHZ_PCIX_533 0x00f00000
36 #define SLOT_100MHZ_PCIX_533 0x0f000000
37 #define SLOT_133MHZ_PCIX_533 0xf0000000
38
39 /* Slot Configuration */
40 #define SLOT_NUM 0x0000001F
41 #define FIRST_DEV_NUM 0x00001F00
42 #define PSN 0x07FF0000
43 #define UPDOWN 0x20000000
44 #define MRLSENSOR 0x40000000
45 #define ATTN_BUTTON 0x80000000
46
47 /*
48 * Interrupt Locator Register definitions
49 */
50 #define CMD_INTR_PENDING (1 << 0)
51 #define SLOT_INTR_PENDING(i) (1 << (i + 1))
52
53 /*
54 * Controller SERR-INT Register
55 */
56 #define GLOBAL_INTR_MASK (1 << 0)
57 #define GLOBAL_SERR_MASK (1 << 1)
58 #define COMMAND_INTR_MASK (1 << 2)
59 #define ARBITER_SERR_MASK (1 << 3)
60 #define COMMAND_DETECTED (1 << 16)
61 #define ARBITER_DETECTED (1 << 17)
62 #define SERR_INTR_RSVDZ_MASK 0xfffc0000
63
64 /*
65 * Logical Slot Register definitions
66 */
67 #define SLOT_REG(i) (SLOT1 + (4 * i))
68
69 #define SLOT_STATE_SHIFT (0)
70 #define SLOT_STATE_MASK (3 << 0)
71 #define SLOT_STATE_PWRONLY (1)
72 #define SLOT_STATE_ENABLED (2)
73 #define SLOT_STATE_DISABLED (3)
74 #define PWR_LED_STATE_SHIFT (2)
75 #define PWR_LED_STATE_MASK (3 << 2)
76 #define ATN_LED_STATE_SHIFT (4)
77 #define ATN_LED_STATE_MASK (3 << 4)
78 #define ATN_LED_STATE_ON (1)
79 #define ATN_LED_STATE_BLINK (2)
80 #define ATN_LED_STATE_OFF (3)
81 #define POWER_FAULT (1 << 6)
82 #define ATN_BUTTON (1 << 7)
83 #define MRL_SENSOR (1 << 8)
84 #define MHZ66_CAP (1 << 9)
85 #define PRSNT_SHIFT (10)
86 #define PRSNT_MASK (3 << 10)
87 #define PCIX_CAP_SHIFT (12)
88 #define PCIX_CAP_MASK_PI1 (3 << 12)
89 #define PCIX_CAP_MASK_PI2 (7 << 12)
90 #define PRSNT_CHANGE_DETECTED (1 << 16)
91 #define ISO_PFAULT_DETECTED (1 << 17)
92 #define BUTTON_PRESS_DETECTED (1 << 18)
93 #define MRL_CHANGE_DETECTED (1 << 19)
94 #define CON_PFAULT_DETECTED (1 << 20)
95 #define PRSNT_CHANGE_INTR_MASK (1 << 24)
96 #define ISO_PFAULT_INTR_MASK (1 << 25)
97 #define BUTTON_PRESS_INTR_MASK (1 << 26)
98 #define MRL_CHANGE_INTR_MASK (1 << 27)
99 #define CON_PFAULT_INTR_MASK (1 << 28)
100 #define MRL_CHANGE_SERR_MASK (1 << 29)
101 #define CON_PFAULT_SERR_MASK (1 << 30)
102 #define SLOT_REG_RSVDZ_MASK ((1 << 15) | (7 << 21))
103
104 /*
105 * SHPC Command Code definitions
106 *
107 * Slot Operation 00h - 3Fh
108 * Set Bus Segment Speed/Mode A 40h - 47h
109 * Power-Only All Slots 48h
110 * Enable All Slots 49h
111 * Set Bus Segment Speed/Mode B (PI=2) 50h - 5Fh
112 * Reserved Command Codes 60h - BFh
113 * Vendor Specific Commands C0h - FFh
114 */
115 #define SET_SLOT_PWR 0x01 /* Slot Operation */
116 #define SET_SLOT_ENABLE 0x02
117 #define SET_SLOT_DISABLE 0x03
118 #define SET_PWR_ON 0x04
119 #define SET_PWR_BLINK 0x08
120 #define SET_PWR_OFF 0x0c
121 #define SET_ATTN_ON 0x10
122 #define SET_ATTN_BLINK 0x20
123 #define SET_ATTN_OFF 0x30
124 #define SETA_PCI_33MHZ 0x40 /* Set Bus Segment Speed/Mode A */
125 #define SETA_PCI_66MHZ 0x41
126 #define SETA_PCIX_66MHZ 0x42
127 #define SETA_PCIX_100MHZ 0x43
128 #define SETA_PCIX_133MHZ 0x44
129 #define SETA_RESERVED1 0x45
130 #define SETA_RESERVED2 0x46
131 #define SETA_RESERVED3 0x47
132 #define SET_PWR_ONLY_ALL 0x48 /* Power-Only All Slots */
133 #define SET_ENABLE_ALL 0x49 /* Enable All Slots */
134 #define SETB_PCI_33MHZ 0x50 /* Set Bus Segment Speed/Mode B */
135 #define SETB_PCI_66MHZ 0x51
136 #define SETB_PCIX_66MHZ_PM 0x52
137 #define SETB_PCIX_100MHZ_PM 0x53
138 #define SETB_PCIX_133MHZ_PM 0x54
139 #define SETB_PCIX_66MHZ_EM 0x55
140 #define SETB_PCIX_100MHZ_EM 0x56
141 #define SETB_PCIX_133MHZ_EM 0x57
142 #define SETB_PCIX_66MHZ_266 0x58
143 #define SETB_PCIX_100MHZ_266 0x59
144 #define SETB_PCIX_133MHZ_266 0x5a
145 #define SETB_PCIX_66MHZ_533 0x5b
146 #define SETB_PCIX_100MHZ_533 0x5c
147 #define SETB_PCIX_133MHZ_533 0x5d
148 #define SETB_RESERVED1 0x5e
149 #define SETB_RESERVED2 0x5f
150
151 /*
152 * SHPC controller command error code
153 */
154 #define SWITCH_OPEN 0x1
155 #define INVALID_CMD 0x2
156 #define INVALID_SPEED_MODE 0x4
157
158 /*
159 * For accessing SHPC Working Register Set via PCI Configuration Space
160 */
161 #define DWORD_SELECT 0x2
162 #define DWORD_DATA 0x4
163
164 /* Field Offset in Logical Slot Register - byte boundary */
165 #define SLOT_EVENT_LATCH 0x2
166 #define SLOT_SERR_INT_MASK 0x3
167
168 static irqreturn_t shpc_isr(int irq, void *dev_id);
169 static void start_int_poll_timer(struct controller *ctrl, int sec);
170 static int hpc_check_cmd_status(struct controller *ctrl);
171
172 static inline u8 shpc_readb(struct controller *ctrl, int reg)
173 {
174 return readb(ctrl->creg + reg);
175 }
176
177 static inline void shpc_writeb(struct controller *ctrl, int reg, u8 val)
178 {
179 writeb(val, ctrl->creg + reg);
180 }
181
182 static inline u16 shpc_readw(struct controller *ctrl, int reg)
183 {
184 return readw(ctrl->creg + reg);
185 }
186
187 static inline void shpc_writew(struct controller *ctrl, int reg, u16 val)
188 {
189 writew(val, ctrl->creg + reg);
190 }
191
192 static inline u32 shpc_readl(struct controller *ctrl, int reg)
193 {
194 return readl(ctrl->creg + reg);
195 }
196
197 static inline void shpc_writel(struct controller *ctrl, int reg, u32 val)
198 {
199 writel(val, ctrl->creg + reg);
200 }
201
202 static inline int shpc_indirect_read(struct controller *ctrl, int index,
203 u32 *value)
204 {
205 int rc;
206 u32 cap_offset = ctrl->cap_offset;
207 struct pci_dev *pdev = ctrl->pci_dev;
208
209 rc = pci_write_config_byte(pdev, cap_offset + DWORD_SELECT, index);
210 if (rc)
211 return rc;
212 return pci_read_config_dword(pdev, cap_offset + DWORD_DATA, value);
213 }
214
215 /*
216 * This is the interrupt polling timeout function.
217 */
218 static void int_poll_timeout(struct timer_list *t)
219 {
220 struct controller *ctrl = from_timer(ctrl, t, poll_timer);
221
222 /* Poll for interrupt events. regs == NULL => polling */
223 shpc_isr(0, ctrl);
224
225 if (!shpchp_poll_time)
226 shpchp_poll_time = 2; /* default polling interval is 2 sec */
227
228 start_int_poll_timer(ctrl, shpchp_poll_time);
229 }
230
231 /*
232 * This function starts the interrupt polling timer.
233 */
234 static void start_int_poll_timer(struct controller *ctrl, int sec)
235 {
236 /* Clamp to sane value */
237 if ((sec <= 0) || (sec > 60))
238 sec = 2;
239
240 ctrl->poll_timer.expires = jiffies + sec * HZ;
241 add_timer(&ctrl->poll_timer);
242 }
243
244 static inline int is_ctrl_busy(struct controller *ctrl)
245 {
246 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS);
247 return cmd_status & 0x1;
248 }
249
250 /*
251 * Returns 1 if SHPC finishes executing a command within 1 sec,
252 * otherwise returns 0.
253 */
254 static inline int shpc_poll_ctrl_busy(struct controller *ctrl)
255 {
256 int i;
257
258 if (!is_ctrl_busy(ctrl))
259 return 1;
260
261 /* Check every 0.1 sec for a total of 1 sec */
262 for (i = 0; i < 10; i++) {
263 msleep(100);
264 if (!is_ctrl_busy(ctrl))
265 return 1;
266 }
267
268 return 0;
269 }
270
271 static inline int shpc_wait_cmd(struct controller *ctrl)
272 {
273 int retval = 0;
274 unsigned long timeout = msecs_to_jiffies(1000);
275 int rc;
276
277 if (shpchp_poll_mode)
278 rc = shpc_poll_ctrl_busy(ctrl);
279 else
280 rc = wait_event_interruptible_timeout(ctrl->queue,
281 !is_ctrl_busy(ctrl), timeout);
282 if (!rc && is_ctrl_busy(ctrl)) {
283 retval = -EIO;
284 ctrl_err(ctrl, "Command not completed in 1000 msec\n");
285 } else if (rc < 0) {
286 retval = -EINTR;
287 ctrl_info(ctrl, "Command was interrupted by a signal\n");
288 }
289
290 return retval;
291 }
292
293 static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
294 {
295 struct controller *ctrl = slot->ctrl;
296 u16 cmd_status;
297 int retval = 0;
298 u16 temp_word;
299
300 mutex_lock(&slot->ctrl->cmd_lock);
301
302 if (!shpc_poll_ctrl_busy(ctrl)) {
303 /* After 1 sec and and the controller is still busy */
304 ctrl_err(ctrl, "Controller is still busy after 1 sec\n");
305 retval = -EBUSY;
306 goto out;
307 }
308
309 ++t_slot;
310 temp_word = (t_slot << 8) | (cmd & 0xFF);
311 ctrl_dbg(ctrl, "%s: t_slot %x cmd %x\n", __func__, t_slot, cmd);
312
313 /* To make sure the Controller Busy bit is 0 before we send out the
314 * command.
315 */
316 shpc_writew(ctrl, CMD, temp_word);
317
318 /*
319 * Wait for command completion.
320 */
321 retval = shpc_wait_cmd(slot->ctrl);
322 if (retval)
323 goto out;
324
325 cmd_status = hpc_check_cmd_status(slot->ctrl);
326 if (cmd_status) {
327 ctrl_err(ctrl, "Failed to issued command 0x%x (error code = %d)\n",
328 cmd, cmd_status);
329 retval = -EIO;
330 }
331 out:
332 mutex_unlock(&slot->ctrl->cmd_lock);
333 return retval;
334 }
335
336 static int hpc_check_cmd_status(struct controller *ctrl)
337 {
338 int retval = 0;
339 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS) & 0x000F;
340
341 switch (cmd_status >> 1) {
342 case 0:
343 retval = 0;
344 break;
345 case 1:
346 retval = SWITCH_OPEN;
347 ctrl_err(ctrl, "Switch opened!\n");
348 break;
349 case 2:
350 retval = INVALID_CMD;
351 ctrl_err(ctrl, "Invalid HPC command!\n");
352 break;
353 case 4:
354 retval = INVALID_SPEED_MODE;
355 ctrl_err(ctrl, "Invalid bus speed/mode!\n");
356 break;
357 default:
358 retval = cmd_status;
359 }
360
361 return retval;
362 }
363
364
365 static int hpc_get_attention_status(struct slot *slot, u8 *status)
366 {
367 struct controller *ctrl = slot->ctrl;
368 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
369 u8 state = (slot_reg & ATN_LED_STATE_MASK) >> ATN_LED_STATE_SHIFT;
370
371 switch (state) {
372 case ATN_LED_STATE_ON:
373 *status = 1; /* On */
374 break;
375 case ATN_LED_STATE_BLINK:
376 *status = 2; /* Blink */
377 break;
378 case ATN_LED_STATE_OFF:
379 *status = 0; /* Off */
380 break;
381 default:
382 *status = 0xFF; /* Reserved */
383 break;
384 }
385
386 return 0;
387 }
388
389 static int hpc_get_power_status(struct slot *slot, u8 *status)
390 {
391 struct controller *ctrl = slot->ctrl;
392 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
393 u8 state = (slot_reg & SLOT_STATE_MASK) >> SLOT_STATE_SHIFT;
394
395 switch (state) {
396 case SLOT_STATE_PWRONLY:
397 *status = 2; /* Powered only */
398 break;
399 case SLOT_STATE_ENABLED:
400 *status = 1; /* Enabled */
401 break;
402 case SLOT_STATE_DISABLED:
403 *status = 0; /* Disabled */
404 break;
405 default:
406 *status = 0xFF; /* Reserved */
407 break;
408 }
409
410 return 0;
411 }
412
413
414 static int hpc_get_latch_status(struct slot *slot, u8 *status)
415 {
416 struct controller *ctrl = slot->ctrl;
417 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
418
419 *status = !!(slot_reg & MRL_SENSOR); /* 0 -> close; 1 -> open */
420
421 return 0;
422 }
423
424 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
425 {
426 struct controller *ctrl = slot->ctrl;
427 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
428 u8 state = (slot_reg & PRSNT_MASK) >> PRSNT_SHIFT;
429
430 *status = (state != 0x3) ? 1 : 0;
431
432 return 0;
433 }
434
435 static int hpc_get_prog_int(struct slot *slot, u8 *prog_int)
436 {
437 struct controller *ctrl = slot->ctrl;
438
439 *prog_int = shpc_readb(ctrl, PROG_INTERFACE);
440
441 return 0;
442 }
443
444 static int hpc_get_adapter_speed(struct slot *slot, enum pci_bus_speed *value)
445 {
446 int retval = 0;
447 struct controller *ctrl = slot->ctrl;
448 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
449 u8 m66_cap = !!(slot_reg & MHZ66_CAP);
450 u8 pi, pcix_cap;
451
452 retval = hpc_get_prog_int(slot, &pi);
453 if (retval)
454 return retval;
455
456 switch (pi) {
457 case 1:
458 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI1) >> PCIX_CAP_SHIFT;
459 break;
460 case 2:
461 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI2) >> PCIX_CAP_SHIFT;
462 break;
463 default:
464 return -ENODEV;
465 }
466
467 ctrl_dbg(ctrl, "%s: slot_reg = %x, pcix_cap = %x, m66_cap = %x\n",
468 __func__, slot_reg, pcix_cap, m66_cap);
469
470 switch (pcix_cap) {
471 case 0x0:
472 *value = m66_cap ? PCI_SPEED_66MHz : PCI_SPEED_33MHz;
473 break;
474 case 0x1:
475 *value = PCI_SPEED_66MHz_PCIX;
476 break;
477 case 0x3:
478 *value = PCI_SPEED_133MHz_PCIX;
479 break;
480 case 0x4:
481 *value = PCI_SPEED_133MHz_PCIX_266;
482 break;
483 case 0x5:
484 *value = PCI_SPEED_133MHz_PCIX_533;
485 break;
486 case 0x2:
487 default:
488 *value = PCI_SPEED_UNKNOWN;
489 retval = -ENODEV;
490 break;
491 }
492
493 ctrl_dbg(ctrl, "Adapter speed = %d\n", *value);
494 return retval;
495 }
496
497 static int hpc_get_mode1_ECC_cap(struct slot *slot, u8 *mode)
498 {
499 int retval = 0;
500 struct controller *ctrl = slot->ctrl;
501 u16 sec_bus_status = shpc_readw(ctrl, SEC_BUS_CONFIG);
502 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
503
504 if (pi == 2) {
505 *mode = (sec_bus_status & 0x0100) >> 8;
506 } else {
507 retval = -1;
508 }
509
510 ctrl_dbg(ctrl, "Mode 1 ECC cap = %d\n", *mode);
511 return retval;
512 }
513
514 static int hpc_query_power_fault(struct slot *slot)
515 {
516 struct controller *ctrl = slot->ctrl;
517 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
518
519 /* Note: Logic 0 => fault */
520 return !(slot_reg & POWER_FAULT);
521 }
522
523 static int hpc_set_attention_status(struct slot *slot, u8 value)
524 {
525 u8 slot_cmd = 0;
526
527 switch (value) {
528 case 0:
529 slot_cmd = SET_ATTN_OFF; /* OFF */
530 break;
531 case 1:
532 slot_cmd = SET_ATTN_ON; /* ON */
533 break;
534 case 2:
535 slot_cmd = SET_ATTN_BLINK; /* BLINK */
536 break;
537 default:
538 return -1;
539 }
540
541 return shpc_write_cmd(slot, slot->hp_slot, slot_cmd);
542 }
543
544
545 static void hpc_set_green_led_on(struct slot *slot)
546 {
547 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_ON);
548 }
549
550 static void hpc_set_green_led_off(struct slot *slot)
551 {
552 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_OFF);
553 }
554
555 static void hpc_set_green_led_blink(struct slot *slot)
556 {
557 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_BLINK);
558 }
559
560 static void hpc_release_ctlr(struct controller *ctrl)
561 {
562 int i;
563 u32 slot_reg, serr_int;
564
565 /*
566 * Mask event interrupts and SERRs of all slots
567 */
568 for (i = 0; i < ctrl->num_slots; i++) {
569 slot_reg = shpc_readl(ctrl, SLOT_REG(i));
570 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
571 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
572 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
573 CON_PFAULT_SERR_MASK);
574 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
575 shpc_writel(ctrl, SLOT_REG(i), slot_reg);
576 }
577
578 cleanup_slots(ctrl);
579
580 /*
581 * Mask SERR and System Interrupt generation
582 */
583 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
584 serr_int |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
585 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
586 serr_int &= ~SERR_INTR_RSVDZ_MASK;
587 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
588
589 if (shpchp_poll_mode)
590 del_timer(&ctrl->poll_timer);
591 else {
592 free_irq(ctrl->pci_dev->irq, ctrl);
593 pci_disable_msi(ctrl->pci_dev);
594 }
595
596 iounmap(ctrl->creg);
597 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
598 }
599
600 static int hpc_power_on_slot(struct slot *slot)
601 {
602 int retval;
603
604 retval = shpc_write_cmd(slot, slot->hp_slot, SET_SLOT_PWR);
605 if (retval)
606 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
607
608 return retval;
609 }
610
611 static int hpc_slot_enable(struct slot *slot)
612 {
613 int retval;
614
615 /* Slot - Enable, Power Indicator - Blink, Attention Indicator - Off */
616 retval = shpc_write_cmd(slot, slot->hp_slot,
617 SET_SLOT_ENABLE | SET_PWR_BLINK | SET_ATTN_OFF);
618 if (retval)
619 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
620
621 return retval;
622 }
623
624 static int hpc_slot_disable(struct slot *slot)
625 {
626 int retval;
627
628 /* Slot - Disable, Power Indicator - Off, Attention Indicator - On */
629 retval = shpc_write_cmd(slot, slot->hp_slot,
630 SET_SLOT_DISABLE | SET_PWR_OFF | SET_ATTN_ON);
631 if (retval)
632 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
633
634 return retval;
635 }
636
637 static int shpc_get_cur_bus_speed(struct controller *ctrl)
638 {
639 int retval = 0;
640 struct pci_bus *bus = ctrl->pci_dev->subordinate;
641 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
642 u16 sec_bus_reg = shpc_readw(ctrl, SEC_BUS_CONFIG);
643 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
644 u8 speed_mode = (pi == 2) ? (sec_bus_reg & 0xF) : (sec_bus_reg & 0x7);
645
646 if ((pi == 1) && (speed_mode > 4)) {
647 retval = -ENODEV;
648 goto out;
649 }
650
651 switch (speed_mode) {
652 case 0x0:
653 bus_speed = PCI_SPEED_33MHz;
654 break;
655 case 0x1:
656 bus_speed = PCI_SPEED_66MHz;
657 break;
658 case 0x2:
659 bus_speed = PCI_SPEED_66MHz_PCIX;
660 break;
661 case 0x3:
662 bus_speed = PCI_SPEED_100MHz_PCIX;
663 break;
664 case 0x4:
665 bus_speed = PCI_SPEED_133MHz_PCIX;
666 break;
667 case 0x5:
668 bus_speed = PCI_SPEED_66MHz_PCIX_ECC;
669 break;
670 case 0x6:
671 bus_speed = PCI_SPEED_100MHz_PCIX_ECC;
672 break;
673 case 0x7:
674 bus_speed = PCI_SPEED_133MHz_PCIX_ECC;
675 break;
676 case 0x8:
677 bus_speed = PCI_SPEED_66MHz_PCIX_266;
678 break;
679 case 0x9:
680 bus_speed = PCI_SPEED_100MHz_PCIX_266;
681 break;
682 case 0xa:
683 bus_speed = PCI_SPEED_133MHz_PCIX_266;
684 break;
685 case 0xb:
686 bus_speed = PCI_SPEED_66MHz_PCIX_533;
687 break;
688 case 0xc:
689 bus_speed = PCI_SPEED_100MHz_PCIX_533;
690 break;
691 case 0xd:
692 bus_speed = PCI_SPEED_133MHz_PCIX_533;
693 break;
694 default:
695 retval = -ENODEV;
696 break;
697 }
698
699 out:
700 bus->cur_bus_speed = bus_speed;
701 dbg("Current bus speed = %d\n", bus_speed);
702 return retval;
703 }
704
705
706 static int hpc_set_bus_speed_mode(struct slot *slot, enum pci_bus_speed value)
707 {
708 int retval;
709 struct controller *ctrl = slot->ctrl;
710 u8 pi, cmd;
711
712 pi = shpc_readb(ctrl, PROG_INTERFACE);
713 if ((pi == 1) && (value > PCI_SPEED_133MHz_PCIX))
714 return -EINVAL;
715
716 switch (value) {
717 case PCI_SPEED_33MHz:
718 cmd = SETA_PCI_33MHZ;
719 break;
720 case PCI_SPEED_66MHz:
721 cmd = SETA_PCI_66MHZ;
722 break;
723 case PCI_SPEED_66MHz_PCIX:
724 cmd = SETA_PCIX_66MHZ;
725 break;
726 case PCI_SPEED_100MHz_PCIX:
727 cmd = SETA_PCIX_100MHZ;
728 break;
729 case PCI_SPEED_133MHz_PCIX:
730 cmd = SETA_PCIX_133MHZ;
731 break;
732 case PCI_SPEED_66MHz_PCIX_ECC:
733 cmd = SETB_PCIX_66MHZ_EM;
734 break;
735 case PCI_SPEED_100MHz_PCIX_ECC:
736 cmd = SETB_PCIX_100MHZ_EM;
737 break;
738 case PCI_SPEED_133MHz_PCIX_ECC:
739 cmd = SETB_PCIX_133MHZ_EM;
740 break;
741 case PCI_SPEED_66MHz_PCIX_266:
742 cmd = SETB_PCIX_66MHZ_266;
743 break;
744 case PCI_SPEED_100MHz_PCIX_266:
745 cmd = SETB_PCIX_100MHZ_266;
746 break;
747 case PCI_SPEED_133MHz_PCIX_266:
748 cmd = SETB_PCIX_133MHZ_266;
749 break;
750 case PCI_SPEED_66MHz_PCIX_533:
751 cmd = SETB_PCIX_66MHZ_533;
752 break;
753 case PCI_SPEED_100MHz_PCIX_533:
754 cmd = SETB_PCIX_100MHZ_533;
755 break;
756 case PCI_SPEED_133MHz_PCIX_533:
757 cmd = SETB_PCIX_133MHZ_533;
758 break;
759 default:
760 return -EINVAL;
761 }
762
763 retval = shpc_write_cmd(slot, 0, cmd);
764 if (retval)
765 ctrl_err(ctrl, "%s: Write command failed!\n", __func__);
766 else
767 shpc_get_cur_bus_speed(ctrl);
768
769 return retval;
770 }
771
772 static irqreturn_t shpc_isr(int irq, void *dev_id)
773 {
774 struct controller *ctrl = (struct controller *)dev_id;
775 u32 serr_int, slot_reg, intr_loc, intr_loc2;
776 int hp_slot;
777
778 /* Check to see if it was our interrupt */
779 intr_loc = shpc_readl(ctrl, INTR_LOC);
780 if (!intr_loc)
781 return IRQ_NONE;
782
783 ctrl_dbg(ctrl, "%s: intr_loc = %x\n", __func__, intr_loc);
784
785 if (!shpchp_poll_mode) {
786 /*
787 * Mask Global Interrupt Mask - see implementation
788 * note on p. 139 of SHPC spec rev 1.0
789 */
790 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
791 serr_int |= GLOBAL_INTR_MASK;
792 serr_int &= ~SERR_INTR_RSVDZ_MASK;
793 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
794
795 intr_loc2 = shpc_readl(ctrl, INTR_LOC);
796 ctrl_dbg(ctrl, "%s: intr_loc2 = %x\n", __func__, intr_loc2);
797 }
798
799 if (intr_loc & CMD_INTR_PENDING) {
800 /*
801 * Command Complete Interrupt Pending
802 * RO only - clear by writing 1 to the Command Completion
803 * Detect bit in Controller SERR-INT register
804 */
805 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
806 serr_int &= ~SERR_INTR_RSVDZ_MASK;
807 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
808
809 wake_up_interruptible(&ctrl->queue);
810 }
811
812 if (!(intr_loc & ~CMD_INTR_PENDING))
813 goto out;
814
815 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
816 /* To find out which slot has interrupt pending */
817 if (!(intr_loc & SLOT_INTR_PENDING(hp_slot)))
818 continue;
819
820 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
821 ctrl_dbg(ctrl, "Slot %x with intr, slot register = %x\n",
822 hp_slot, slot_reg);
823
824 if (slot_reg & MRL_CHANGE_DETECTED)
825 shpchp_handle_switch_change(hp_slot, ctrl);
826
827 if (slot_reg & BUTTON_PRESS_DETECTED)
828 shpchp_handle_attention_button(hp_slot, ctrl);
829
830 if (slot_reg & PRSNT_CHANGE_DETECTED)
831 shpchp_handle_presence_change(hp_slot, ctrl);
832
833 if (slot_reg & (ISO_PFAULT_DETECTED | CON_PFAULT_DETECTED))
834 shpchp_handle_power_fault(hp_slot, ctrl);
835
836 /* Clear all slot events */
837 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
838 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
839 }
840 out:
841 if (!shpchp_poll_mode) {
842 /* Unmask Global Interrupt Mask */
843 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
844 serr_int &= ~(GLOBAL_INTR_MASK | SERR_INTR_RSVDZ_MASK);
845 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
846 }
847
848 return IRQ_HANDLED;
849 }
850
851 static int shpc_get_max_bus_speed(struct controller *ctrl)
852 {
853 int retval = 0;
854 struct pci_bus *bus = ctrl->pci_dev->subordinate;
855 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
856 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
857 u32 slot_avail1 = shpc_readl(ctrl, SLOT_AVAIL1);
858 u32 slot_avail2 = shpc_readl(ctrl, SLOT_AVAIL2);
859
860 if (pi == 2) {
861 if (slot_avail2 & SLOT_133MHZ_PCIX_533)
862 bus_speed = PCI_SPEED_133MHz_PCIX_533;
863 else if (slot_avail2 & SLOT_100MHZ_PCIX_533)
864 bus_speed = PCI_SPEED_100MHz_PCIX_533;
865 else if (slot_avail2 & SLOT_66MHZ_PCIX_533)
866 bus_speed = PCI_SPEED_66MHz_PCIX_533;
867 else if (slot_avail2 & SLOT_133MHZ_PCIX_266)
868 bus_speed = PCI_SPEED_133MHz_PCIX_266;
869 else if (slot_avail2 & SLOT_100MHZ_PCIX_266)
870 bus_speed = PCI_SPEED_100MHz_PCIX_266;
871 else if (slot_avail2 & SLOT_66MHZ_PCIX_266)
872 bus_speed = PCI_SPEED_66MHz_PCIX_266;
873 }
874
875 if (bus_speed == PCI_SPEED_UNKNOWN) {
876 if (slot_avail1 & SLOT_133MHZ_PCIX)
877 bus_speed = PCI_SPEED_133MHz_PCIX;
878 else if (slot_avail1 & SLOT_100MHZ_PCIX)
879 bus_speed = PCI_SPEED_100MHz_PCIX;
880 else if (slot_avail1 & SLOT_66MHZ_PCIX)
881 bus_speed = PCI_SPEED_66MHz_PCIX;
882 else if (slot_avail2 & SLOT_66MHZ)
883 bus_speed = PCI_SPEED_66MHz;
884 else if (slot_avail1 & SLOT_33MHZ)
885 bus_speed = PCI_SPEED_33MHz;
886 else
887 retval = -ENODEV;
888 }
889
890 bus->max_bus_speed = bus_speed;
891 ctrl_dbg(ctrl, "Max bus speed = %d\n", bus_speed);
892
893 return retval;
894 }
895
896 static const struct hpc_ops shpchp_hpc_ops = {
897 .power_on_slot = hpc_power_on_slot,
898 .slot_enable = hpc_slot_enable,
899 .slot_disable = hpc_slot_disable,
900 .set_bus_speed_mode = hpc_set_bus_speed_mode,
901 .set_attention_status = hpc_set_attention_status,
902 .get_power_status = hpc_get_power_status,
903 .get_attention_status = hpc_get_attention_status,
904 .get_latch_status = hpc_get_latch_status,
905 .get_adapter_status = hpc_get_adapter_status,
906
907 .get_adapter_speed = hpc_get_adapter_speed,
908 .get_mode1_ECC_cap = hpc_get_mode1_ECC_cap,
909 .get_prog_int = hpc_get_prog_int,
910
911 .query_power_fault = hpc_query_power_fault,
912 .green_led_on = hpc_set_green_led_on,
913 .green_led_off = hpc_set_green_led_off,
914 .green_led_blink = hpc_set_green_led_blink,
915
916 .release_ctlr = hpc_release_ctlr,
917 };
918
919 int shpc_init(struct controller *ctrl, struct pci_dev *pdev)
920 {
921 int rc = -1, num_slots = 0;
922 u8 hp_slot;
923 u32 shpc_base_offset;
924 u32 tempdword, slot_reg, slot_config;
925 u8 i;
926
927 ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */
928 ctrl_dbg(ctrl, "Hotplug Controller:\n");
929
930 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
931 pdev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) {
932 /* amd shpc driver doesn't use Base Offset; assume 0 */
933 ctrl->mmio_base = pci_resource_start(pdev, 0);
934 ctrl->mmio_size = pci_resource_len(pdev, 0);
935 } else {
936 ctrl->cap_offset = pci_find_capability(pdev, PCI_CAP_ID_SHPC);
937 if (!ctrl->cap_offset) {
938 ctrl_err(ctrl, "Cannot find PCI capability\n");
939 goto abort;
940 }
941 ctrl_dbg(ctrl, " cap_offset = %x\n", ctrl->cap_offset);
942
943 rc = shpc_indirect_read(ctrl, 0, &shpc_base_offset);
944 if (rc) {
945 ctrl_err(ctrl, "Cannot read base_offset\n");
946 goto abort;
947 }
948
949 rc = shpc_indirect_read(ctrl, 3, &tempdword);
950 if (rc) {
951 ctrl_err(ctrl, "Cannot read slot config\n");
952 goto abort;
953 }
954 num_slots = tempdword & SLOT_NUM;
955 ctrl_dbg(ctrl, " num_slots (indirect) %x\n", num_slots);
956
957 for (i = 0; i < 9 + num_slots; i++) {
958 rc = shpc_indirect_read(ctrl, i, &tempdword);
959 if (rc) {
960 ctrl_err(ctrl, "Cannot read creg (index = %d)\n",
961 i);
962 goto abort;
963 }
964 ctrl_dbg(ctrl, " offset %d: value %x\n", i, tempdword);
965 }
966
967 ctrl->mmio_base =
968 pci_resource_start(pdev, 0) + shpc_base_offset;
969 ctrl->mmio_size = 0x24 + 0x4 * num_slots;
970 }
971
972 ctrl_info(ctrl, "HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
973 pdev->vendor, pdev->device, pdev->subsystem_vendor,
974 pdev->subsystem_device);
975
976 rc = pci_enable_device(pdev);
977 if (rc) {
978 ctrl_err(ctrl, "pci_enable_device failed\n");
979 goto abort;
980 }
981
982 if (!request_mem_region(ctrl->mmio_base, ctrl->mmio_size, MY_NAME)) {
983 ctrl_err(ctrl, "Cannot reserve MMIO region\n");
984 rc = -1;
985 goto abort;
986 }
987
988 ctrl->creg = ioremap(ctrl->mmio_base, ctrl->mmio_size);
989 if (!ctrl->creg) {
990 ctrl_err(ctrl, "Cannot remap MMIO region %lx @ %lx\n",
991 ctrl->mmio_size, ctrl->mmio_base);
992 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
993 rc = -1;
994 goto abort;
995 }
996 ctrl_dbg(ctrl, "ctrl->creg %p\n", ctrl->creg);
997
998 mutex_init(&ctrl->crit_sect);
999 mutex_init(&ctrl->cmd_lock);
1000
1001 /* Setup wait queue */
1002 init_waitqueue_head(&ctrl->queue);
1003
1004 ctrl->hpc_ops = &shpchp_hpc_ops;
1005
1006 /* Return PCI Controller Info */
1007 slot_config = shpc_readl(ctrl, SLOT_CONFIG);
1008 ctrl->slot_device_offset = (slot_config & FIRST_DEV_NUM) >> 8;
1009 ctrl->num_slots = slot_config & SLOT_NUM;
1010 ctrl->first_slot = (slot_config & PSN) >> 16;
1011 ctrl->slot_num_inc = ((slot_config & UPDOWN) >> 29) ? 1 : -1;
1012
1013 /* Mask Global Interrupt Mask & Command Complete Interrupt Mask */
1014 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1015 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
1016 tempdword |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
1017 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
1018 tempdword &= ~SERR_INTR_RSVDZ_MASK;
1019 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
1020 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1021 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
1022
1023 /* Mask the MRL sensor SERR Mask of individual slot in
1024 * Slot SERR-INT Mask & clear all the existing event if any
1025 */
1026 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1027 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1028 ctrl_dbg(ctrl, "Default Logical Slot Register %d value %x\n",
1029 hp_slot, slot_reg);
1030 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1031 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1032 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
1033 CON_PFAULT_SERR_MASK);
1034 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
1035 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1036 }
1037
1038 if (shpchp_poll_mode) {
1039 /* Install interrupt polling timer. Start with 10 sec delay */
1040 timer_setup(&ctrl->poll_timer, int_poll_timeout, 0);
1041 start_int_poll_timer(ctrl, 10);
1042 } else {
1043 /* Installs the interrupt handler */
1044 rc = pci_enable_msi(pdev);
1045 if (rc) {
1046 ctrl_info(ctrl, "Can't get msi for the hotplug controller\n");
1047 ctrl_info(ctrl, "Use INTx for the hotplug controller\n");
1048 } else {
1049 pci_set_master(pdev);
1050 }
1051
1052 rc = request_irq(ctrl->pci_dev->irq, shpc_isr, IRQF_SHARED,
1053 MY_NAME, (void *)ctrl);
1054 ctrl_dbg(ctrl, "request_irq %d (returns %d)\n",
1055 ctrl->pci_dev->irq, rc);
1056 if (rc) {
1057 ctrl_err(ctrl, "Can't get irq %d for the hotplug controller\n",
1058 ctrl->pci_dev->irq);
1059 goto abort_iounmap;
1060 }
1061 }
1062 ctrl_dbg(ctrl, "HPC at %s irq=%x\n", pci_name(pdev), pdev->irq);
1063
1064 shpc_get_max_bus_speed(ctrl);
1065 shpc_get_cur_bus_speed(ctrl);
1066
1067 /*
1068 * Unmask all event interrupts of all slots
1069 */
1070 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1071 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1072 ctrl_dbg(ctrl, "Default Logical Slot Register %d value %x\n",
1073 hp_slot, slot_reg);
1074 slot_reg &= ~(PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1075 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1076 CON_PFAULT_INTR_MASK | SLOT_REG_RSVDZ_MASK);
1077 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1078 }
1079 if (!shpchp_poll_mode) {
1080 /* Unmask all general input interrupts and SERR */
1081 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1082 tempdword &= ~(GLOBAL_INTR_MASK | COMMAND_INTR_MASK |
1083 SERR_INTR_RSVDZ_MASK);
1084 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
1085 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1086 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
1087 }
1088
1089 return 0;
1090
1091 /* We end up here for the many possible ways to fail this API. */
1092 abort_iounmap:
1093 iounmap(ctrl->creg);
1094 abort:
1095 return rc;
1096 }
Linux with added FPC-III support