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
shpc_readb(struct controller * ctrl,int reg)172 static inline u8 shpc_readb(struct controller *ctrl, int reg)
173 {
174 return readb(ctrl->creg + reg);
175 }
176
shpc_readw(struct controller * ctrl,int reg)177 static inline u16 shpc_readw(struct controller *ctrl, int reg)
178 {
179 return readw(ctrl->creg + reg);
180 }
181
shpc_writew(struct controller * ctrl,int reg,u16 val)182 static inline void shpc_writew(struct controller *ctrl, int reg, u16 val)
183 {
184 writew(val, ctrl->creg + reg);
185 }
186
shpc_readl(struct controller * ctrl,int reg)187 static inline u32 shpc_readl(struct controller *ctrl, int reg)
188 {
189 return readl(ctrl->creg + reg);
190 }
191
shpc_writel(struct controller * ctrl,int reg,u32 val)192 static inline void shpc_writel(struct controller *ctrl, int reg, u32 val)
193 {
194 writel(val, ctrl->creg + reg);
195 }
196
shpc_indirect_read(struct controller * ctrl,int index,u32 * value)197 static inline int shpc_indirect_read(struct controller *ctrl, int index,
198 u32 *value)
199 {
200 int rc;
201 u32 cap_offset = ctrl->cap_offset;
202 struct pci_dev *pdev = ctrl->pci_dev;
203
204 rc = pci_write_config_byte(pdev, cap_offset + DWORD_SELECT, index);
205 if (rc)
206 return rc;
207 return pci_read_config_dword(pdev, cap_offset + DWORD_DATA, value);
208 }
209
210 /*
211 * This is the interrupt polling timeout function.
212 */
int_poll_timeout(struct timer_list * t)213 static void int_poll_timeout(struct timer_list *t)
214 {
215 struct controller *ctrl = from_timer(ctrl, t, poll_timer);
216
217 /* Poll for interrupt events. regs == NULL => polling */
218 shpc_isr(0, ctrl);
219
220 if (!shpchp_poll_time)
221 shpchp_poll_time = 2; /* default polling interval is 2 sec */
222
223 start_int_poll_timer(ctrl, shpchp_poll_time);
224 }
225
226 /*
227 * This function starts the interrupt polling timer.
228 */
start_int_poll_timer(struct controller * ctrl,int sec)229 static void start_int_poll_timer(struct controller *ctrl, int sec)
230 {
231 /* Clamp to sane value */
232 if ((sec <= 0) || (sec > 60))
233 sec = 2;
234
235 ctrl->poll_timer.expires = jiffies + sec * HZ;
236 add_timer(&ctrl->poll_timer);
237 }
238
is_ctrl_busy(struct controller * ctrl)239 static inline int is_ctrl_busy(struct controller *ctrl)
240 {
241 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS);
242 return cmd_status & 0x1;
243 }
244
245 /*
246 * Returns 1 if SHPC finishes executing a command within 1 sec,
247 * otherwise returns 0.
248 */
shpc_poll_ctrl_busy(struct controller * ctrl)249 static inline int shpc_poll_ctrl_busy(struct controller *ctrl)
250 {
251 int i;
252
253 if (!is_ctrl_busy(ctrl))
254 return 1;
255
256 /* Check every 0.1 sec for a total of 1 sec */
257 for (i = 0; i < 10; i++) {
258 msleep(100);
259 if (!is_ctrl_busy(ctrl))
260 return 1;
261 }
262
263 return 0;
264 }
265
shpc_wait_cmd(struct controller * ctrl)266 static inline int shpc_wait_cmd(struct controller *ctrl)
267 {
268 int retval = 0;
269 unsigned long timeout = msecs_to_jiffies(1000);
270 int rc;
271
272 if (shpchp_poll_mode)
273 rc = shpc_poll_ctrl_busy(ctrl);
274 else
275 rc = wait_event_interruptible_timeout(ctrl->queue,
276 !is_ctrl_busy(ctrl), timeout);
277 if (!rc && is_ctrl_busy(ctrl)) {
278 retval = -EIO;
279 ctrl_err(ctrl, "Command not completed in 1000 msec\n");
280 } else if (rc < 0) {
281 retval = -EINTR;
282 ctrl_info(ctrl, "Command was interrupted by a signal\n");
283 }
284
285 return retval;
286 }
287
shpc_write_cmd(struct slot * slot,u8 t_slot,u8 cmd)288 static int shpc_write_cmd(struct slot *slot, u8 t_slot, u8 cmd)
289 {
290 struct controller *ctrl = slot->ctrl;
291 u16 cmd_status;
292 int retval = 0;
293 u16 temp_word;
294
295 mutex_lock(&slot->ctrl->cmd_lock);
296
297 if (!shpc_poll_ctrl_busy(ctrl)) {
298 /* After 1 sec and the controller is still busy */
299 ctrl_err(ctrl, "Controller is still busy after 1 sec\n");
300 retval = -EBUSY;
301 goto out;
302 }
303
304 ++t_slot;
305 temp_word = (t_slot << 8) | (cmd & 0xFF);
306 ctrl_dbg(ctrl, "%s: t_slot %x cmd %x\n", __func__, t_slot, cmd);
307
308 /* To make sure the Controller Busy bit is 0 before we send out the
309 * command.
310 */
311 shpc_writew(ctrl, CMD, temp_word);
312
313 /*
314 * Wait for command completion.
315 */
316 retval = shpc_wait_cmd(slot->ctrl);
317 if (retval)
318 goto out;
319
320 cmd_status = hpc_check_cmd_status(slot->ctrl);
321 if (cmd_status) {
322 ctrl_err(ctrl, "Failed to issued command 0x%x (error code = %d)\n",
323 cmd, cmd_status);
324 retval = -EIO;
325 }
326 out:
327 mutex_unlock(&slot->ctrl->cmd_lock);
328 return retval;
329 }
330
hpc_check_cmd_status(struct controller * ctrl)331 static int hpc_check_cmd_status(struct controller *ctrl)
332 {
333 int retval = 0;
334 u16 cmd_status = shpc_readw(ctrl, CMD_STATUS) & 0x000F;
335
336 switch (cmd_status >> 1) {
337 case 0:
338 retval = 0;
339 break;
340 case 1:
341 retval = SWITCH_OPEN;
342 ctrl_err(ctrl, "Switch opened!\n");
343 break;
344 case 2:
345 retval = INVALID_CMD;
346 ctrl_err(ctrl, "Invalid HPC command!\n");
347 break;
348 case 4:
349 retval = INVALID_SPEED_MODE;
350 ctrl_err(ctrl, "Invalid bus speed/mode!\n");
351 break;
352 default:
353 retval = cmd_status;
354 }
355
356 return retval;
357 }
358
359
hpc_get_attention_status(struct slot * slot,u8 * status)360 static int hpc_get_attention_status(struct slot *slot, u8 *status)
361 {
362 struct controller *ctrl = slot->ctrl;
363 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
364 u8 state = (slot_reg & ATN_LED_STATE_MASK) >> ATN_LED_STATE_SHIFT;
365
366 switch (state) {
367 case ATN_LED_STATE_ON:
368 *status = 1; /* On */
369 break;
370 case ATN_LED_STATE_BLINK:
371 *status = 2; /* Blink */
372 break;
373 case ATN_LED_STATE_OFF:
374 *status = 0; /* Off */
375 break;
376 default:
377 *status = 0xFF; /* Reserved */
378 break;
379 }
380
381 return 0;
382 }
383
hpc_get_power_status(struct slot * slot,u8 * status)384 static int hpc_get_power_status(struct slot *slot, u8 *status)
385 {
386 struct controller *ctrl = slot->ctrl;
387 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
388 u8 state = (slot_reg & SLOT_STATE_MASK) >> SLOT_STATE_SHIFT;
389
390 switch (state) {
391 case SLOT_STATE_PWRONLY:
392 *status = 2; /* Powered only */
393 break;
394 case SLOT_STATE_ENABLED:
395 *status = 1; /* Enabled */
396 break;
397 case SLOT_STATE_DISABLED:
398 *status = 0; /* Disabled */
399 break;
400 default:
401 *status = 0xFF; /* Reserved */
402 break;
403 }
404
405 return 0;
406 }
407
408
hpc_get_latch_status(struct slot * slot,u8 * status)409 static int hpc_get_latch_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
414 *status = !!(slot_reg & MRL_SENSOR); /* 0 -> close; 1 -> open */
415
416 return 0;
417 }
418
hpc_get_adapter_status(struct slot * slot,u8 * status)419 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
420 {
421 struct controller *ctrl = slot->ctrl;
422 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
423 u8 state = (slot_reg & PRSNT_MASK) >> PRSNT_SHIFT;
424
425 *status = (state != 0x3) ? 1 : 0;
426
427 return 0;
428 }
429
hpc_get_prog_int(struct slot * slot,u8 * prog_int)430 static int hpc_get_prog_int(struct slot *slot, u8 *prog_int)
431 {
432 struct controller *ctrl = slot->ctrl;
433
434 *prog_int = shpc_readb(ctrl, PROG_INTERFACE);
435
436 return 0;
437 }
438
hpc_get_adapter_speed(struct slot * slot,enum pci_bus_speed * value)439 static int hpc_get_adapter_speed(struct slot *slot, enum pci_bus_speed *value)
440 {
441 int retval = 0;
442 struct controller *ctrl = slot->ctrl;
443 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
444 u8 m66_cap = !!(slot_reg & MHZ66_CAP);
445 u8 pi, pcix_cap;
446
447 retval = hpc_get_prog_int(slot, &pi);
448 if (retval)
449 return retval;
450
451 switch (pi) {
452 case 1:
453 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI1) >> PCIX_CAP_SHIFT;
454 break;
455 case 2:
456 pcix_cap = (slot_reg & PCIX_CAP_MASK_PI2) >> PCIX_CAP_SHIFT;
457 break;
458 default:
459 return -ENODEV;
460 }
461
462 ctrl_dbg(ctrl, "%s: slot_reg = %x, pcix_cap = %x, m66_cap = %x\n",
463 __func__, slot_reg, pcix_cap, m66_cap);
464
465 switch (pcix_cap) {
466 case 0x0:
467 *value = m66_cap ? PCI_SPEED_66MHz : PCI_SPEED_33MHz;
468 break;
469 case 0x1:
470 *value = PCI_SPEED_66MHz_PCIX;
471 break;
472 case 0x3:
473 *value = PCI_SPEED_133MHz_PCIX;
474 break;
475 case 0x4:
476 *value = PCI_SPEED_133MHz_PCIX_266;
477 break;
478 case 0x5:
479 *value = PCI_SPEED_133MHz_PCIX_533;
480 break;
481 case 0x2:
482 default:
483 *value = PCI_SPEED_UNKNOWN;
484 retval = -ENODEV;
485 break;
486 }
487
488 ctrl_dbg(ctrl, "Adapter speed = %d\n", *value);
489 return retval;
490 }
491
hpc_query_power_fault(struct slot * slot)492 static int hpc_query_power_fault(struct slot *slot)
493 {
494 struct controller *ctrl = slot->ctrl;
495 u32 slot_reg = shpc_readl(ctrl, SLOT_REG(slot->hp_slot));
496
497 /* Note: Logic 0 => fault */
498 return !(slot_reg & POWER_FAULT);
499 }
500
hpc_set_attention_status(struct slot * slot,u8 value)501 static int hpc_set_attention_status(struct slot *slot, u8 value)
502 {
503 u8 slot_cmd = 0;
504
505 switch (value) {
506 case 0:
507 slot_cmd = SET_ATTN_OFF; /* OFF */
508 break;
509 case 1:
510 slot_cmd = SET_ATTN_ON; /* ON */
511 break;
512 case 2:
513 slot_cmd = SET_ATTN_BLINK; /* BLINK */
514 break;
515 default:
516 return -1;
517 }
518
519 return shpc_write_cmd(slot, slot->hp_slot, slot_cmd);
520 }
521
522
hpc_set_green_led_on(struct slot * slot)523 static void hpc_set_green_led_on(struct slot *slot)
524 {
525 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_ON);
526 }
527
hpc_set_green_led_off(struct slot * slot)528 static void hpc_set_green_led_off(struct slot *slot)
529 {
530 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_OFF);
531 }
532
hpc_set_green_led_blink(struct slot * slot)533 static void hpc_set_green_led_blink(struct slot *slot)
534 {
535 shpc_write_cmd(slot, slot->hp_slot, SET_PWR_BLINK);
536 }
537
hpc_release_ctlr(struct controller * ctrl)538 static void hpc_release_ctlr(struct controller *ctrl)
539 {
540 int i;
541 u32 slot_reg, serr_int;
542
543 /*
544 * Mask event interrupts and SERRs of all slots
545 */
546 for (i = 0; i < ctrl->num_slots; i++) {
547 slot_reg = shpc_readl(ctrl, SLOT_REG(i));
548 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
549 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
550 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
551 CON_PFAULT_SERR_MASK);
552 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
553 shpc_writel(ctrl, SLOT_REG(i), slot_reg);
554 }
555
556 cleanup_slots(ctrl);
557
558 /*
559 * Mask SERR and System Interrupt generation
560 */
561 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
562 serr_int |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
563 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
564 serr_int &= ~SERR_INTR_RSVDZ_MASK;
565 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
566
567 if (shpchp_poll_mode)
568 del_timer(&ctrl->poll_timer);
569 else {
570 free_irq(ctrl->pci_dev->irq, ctrl);
571 pci_disable_msi(ctrl->pci_dev);
572 }
573
574 iounmap(ctrl->creg);
575 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
576 }
577
hpc_power_on_slot(struct slot * slot)578 static int hpc_power_on_slot(struct slot *slot)
579 {
580 int retval;
581
582 retval = shpc_write_cmd(slot, slot->hp_slot, SET_SLOT_PWR);
583 if (retval)
584 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
585
586 return retval;
587 }
588
hpc_slot_enable(struct slot * slot)589 static int hpc_slot_enable(struct slot *slot)
590 {
591 int retval;
592
593 /* Slot - Enable, Power Indicator - Blink, Attention Indicator - Off */
594 retval = shpc_write_cmd(slot, slot->hp_slot,
595 SET_SLOT_ENABLE | SET_PWR_BLINK | SET_ATTN_OFF);
596 if (retval)
597 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
598
599 return retval;
600 }
601
hpc_slot_disable(struct slot * slot)602 static int hpc_slot_disable(struct slot *slot)
603 {
604 int retval;
605
606 /* Slot - Disable, Power Indicator - Off, Attention Indicator - On */
607 retval = shpc_write_cmd(slot, slot->hp_slot,
608 SET_SLOT_DISABLE | SET_PWR_OFF | SET_ATTN_ON);
609 if (retval)
610 ctrl_err(slot->ctrl, "%s: Write command failed!\n", __func__);
611
612 return retval;
613 }
614
shpc_get_cur_bus_speed(struct controller * ctrl)615 static int shpc_get_cur_bus_speed(struct controller *ctrl)
616 {
617 int retval = 0;
618 struct pci_bus *bus = ctrl->pci_dev->subordinate;
619 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
620 u16 sec_bus_reg = shpc_readw(ctrl, SEC_BUS_CONFIG);
621 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
622 u8 speed_mode = (pi == 2) ? (sec_bus_reg & 0xF) : (sec_bus_reg & 0x7);
623
624 if ((pi == 1) && (speed_mode > 4)) {
625 retval = -ENODEV;
626 goto out;
627 }
628
629 switch (speed_mode) {
630 case 0x0:
631 bus_speed = PCI_SPEED_33MHz;
632 break;
633 case 0x1:
634 bus_speed = PCI_SPEED_66MHz;
635 break;
636 case 0x2:
637 bus_speed = PCI_SPEED_66MHz_PCIX;
638 break;
639 case 0x3:
640 bus_speed = PCI_SPEED_100MHz_PCIX;
641 break;
642 case 0x4:
643 bus_speed = PCI_SPEED_133MHz_PCIX;
644 break;
645 case 0x5:
646 bus_speed = PCI_SPEED_66MHz_PCIX_ECC;
647 break;
648 case 0x6:
649 bus_speed = PCI_SPEED_100MHz_PCIX_ECC;
650 break;
651 case 0x7:
652 bus_speed = PCI_SPEED_133MHz_PCIX_ECC;
653 break;
654 case 0x8:
655 bus_speed = PCI_SPEED_66MHz_PCIX_266;
656 break;
657 case 0x9:
658 bus_speed = PCI_SPEED_100MHz_PCIX_266;
659 break;
660 case 0xa:
661 bus_speed = PCI_SPEED_133MHz_PCIX_266;
662 break;
663 case 0xb:
664 bus_speed = PCI_SPEED_66MHz_PCIX_533;
665 break;
666 case 0xc:
667 bus_speed = PCI_SPEED_100MHz_PCIX_533;
668 break;
669 case 0xd:
670 bus_speed = PCI_SPEED_133MHz_PCIX_533;
671 break;
672 default:
673 retval = -ENODEV;
674 break;
675 }
676
677 out:
678 bus->cur_bus_speed = bus_speed;
679 dbg("Current bus speed = %d\n", bus_speed);
680 return retval;
681 }
682
683
hpc_set_bus_speed_mode(struct slot * slot,enum pci_bus_speed value)684 static int hpc_set_bus_speed_mode(struct slot *slot, enum pci_bus_speed value)
685 {
686 int retval;
687 struct controller *ctrl = slot->ctrl;
688 u8 pi, cmd;
689
690 pi = shpc_readb(ctrl, PROG_INTERFACE);
691 if ((pi == 1) && (value > PCI_SPEED_133MHz_PCIX))
692 return -EINVAL;
693
694 switch (value) {
695 case PCI_SPEED_33MHz:
696 cmd = SETA_PCI_33MHZ;
697 break;
698 case PCI_SPEED_66MHz:
699 cmd = SETA_PCI_66MHZ;
700 break;
701 case PCI_SPEED_66MHz_PCIX:
702 cmd = SETA_PCIX_66MHZ;
703 break;
704 case PCI_SPEED_100MHz_PCIX:
705 cmd = SETA_PCIX_100MHZ;
706 break;
707 case PCI_SPEED_133MHz_PCIX:
708 cmd = SETA_PCIX_133MHZ;
709 break;
710 case PCI_SPEED_66MHz_PCIX_ECC:
711 cmd = SETB_PCIX_66MHZ_EM;
712 break;
713 case PCI_SPEED_100MHz_PCIX_ECC:
714 cmd = SETB_PCIX_100MHZ_EM;
715 break;
716 case PCI_SPEED_133MHz_PCIX_ECC:
717 cmd = SETB_PCIX_133MHZ_EM;
718 break;
719 case PCI_SPEED_66MHz_PCIX_266:
720 cmd = SETB_PCIX_66MHZ_266;
721 break;
722 case PCI_SPEED_100MHz_PCIX_266:
723 cmd = SETB_PCIX_100MHZ_266;
724 break;
725 case PCI_SPEED_133MHz_PCIX_266:
726 cmd = SETB_PCIX_133MHZ_266;
727 break;
728 case PCI_SPEED_66MHz_PCIX_533:
729 cmd = SETB_PCIX_66MHZ_533;
730 break;
731 case PCI_SPEED_100MHz_PCIX_533:
732 cmd = SETB_PCIX_100MHZ_533;
733 break;
734 case PCI_SPEED_133MHz_PCIX_533:
735 cmd = SETB_PCIX_133MHZ_533;
736 break;
737 default:
738 return -EINVAL;
739 }
740
741 retval = shpc_write_cmd(slot, 0, cmd);
742 if (retval)
743 ctrl_err(ctrl, "%s: Write command failed!\n", __func__);
744 else
745 shpc_get_cur_bus_speed(ctrl);
746
747 return retval;
748 }
749
shpc_isr(int irq,void * dev_id)750 static irqreturn_t shpc_isr(int irq, void *dev_id)
751 {
752 struct controller *ctrl = (struct controller *)dev_id;
753 u32 serr_int, slot_reg, intr_loc, intr_loc2;
754 int hp_slot;
755
756 /* Check to see if it was our interrupt */
757 intr_loc = shpc_readl(ctrl, INTR_LOC);
758 if (!intr_loc)
759 return IRQ_NONE;
760
761 ctrl_dbg(ctrl, "%s: intr_loc = %x\n", __func__, intr_loc);
762
763 if (!shpchp_poll_mode) {
764 /*
765 * Mask Global Interrupt Mask - see implementation
766 * note on p. 139 of SHPC spec rev 1.0
767 */
768 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
769 serr_int |= GLOBAL_INTR_MASK;
770 serr_int &= ~SERR_INTR_RSVDZ_MASK;
771 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
772
773 intr_loc2 = shpc_readl(ctrl, INTR_LOC);
774 ctrl_dbg(ctrl, "%s: intr_loc2 = %x\n", __func__, intr_loc2);
775 }
776
777 if (intr_loc & CMD_INTR_PENDING) {
778 /*
779 * Command Complete Interrupt Pending
780 * RO only - clear by writing 1 to the Command Completion
781 * Detect bit in Controller SERR-INT register
782 */
783 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
784 serr_int &= ~SERR_INTR_RSVDZ_MASK;
785 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
786
787 wake_up_interruptible(&ctrl->queue);
788 }
789
790 if (!(intr_loc & ~CMD_INTR_PENDING))
791 goto out;
792
793 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
794 /* To find out which slot has interrupt pending */
795 if (!(intr_loc & SLOT_INTR_PENDING(hp_slot)))
796 continue;
797
798 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
799 ctrl_dbg(ctrl, "Slot %x with intr, slot register = %x\n",
800 hp_slot, slot_reg);
801
802 if (slot_reg & MRL_CHANGE_DETECTED)
803 shpchp_handle_switch_change(hp_slot, ctrl);
804
805 if (slot_reg & BUTTON_PRESS_DETECTED)
806 shpchp_handle_attention_button(hp_slot, ctrl);
807
808 if (slot_reg & PRSNT_CHANGE_DETECTED)
809 shpchp_handle_presence_change(hp_slot, ctrl);
810
811 if (slot_reg & (ISO_PFAULT_DETECTED | CON_PFAULT_DETECTED))
812 shpchp_handle_power_fault(hp_slot, ctrl);
813
814 /* Clear all slot events */
815 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
816 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
817 }
818 out:
819 if (!shpchp_poll_mode) {
820 /* Unmask Global Interrupt Mask */
821 serr_int = shpc_readl(ctrl, SERR_INTR_ENABLE);
822 serr_int &= ~(GLOBAL_INTR_MASK | SERR_INTR_RSVDZ_MASK);
823 shpc_writel(ctrl, SERR_INTR_ENABLE, serr_int);
824 }
825
826 return IRQ_HANDLED;
827 }
828
shpc_get_max_bus_speed(struct controller * ctrl)829 static int shpc_get_max_bus_speed(struct controller *ctrl)
830 {
831 int retval = 0;
832 struct pci_bus *bus = ctrl->pci_dev->subordinate;
833 enum pci_bus_speed bus_speed = PCI_SPEED_UNKNOWN;
834 u8 pi = shpc_readb(ctrl, PROG_INTERFACE);
835 u32 slot_avail1 = shpc_readl(ctrl, SLOT_AVAIL1);
836 u32 slot_avail2 = shpc_readl(ctrl, SLOT_AVAIL2);
837
838 if (pi == 2) {
839 if (slot_avail2 & SLOT_133MHZ_PCIX_533)
840 bus_speed = PCI_SPEED_133MHz_PCIX_533;
841 else if (slot_avail2 & SLOT_100MHZ_PCIX_533)
842 bus_speed = PCI_SPEED_100MHz_PCIX_533;
843 else if (slot_avail2 & SLOT_66MHZ_PCIX_533)
844 bus_speed = PCI_SPEED_66MHz_PCIX_533;
845 else if (slot_avail2 & SLOT_133MHZ_PCIX_266)
846 bus_speed = PCI_SPEED_133MHz_PCIX_266;
847 else if (slot_avail2 & SLOT_100MHZ_PCIX_266)
848 bus_speed = PCI_SPEED_100MHz_PCIX_266;
849 else if (slot_avail2 & SLOT_66MHZ_PCIX_266)
850 bus_speed = PCI_SPEED_66MHz_PCIX_266;
851 }
852
853 if (bus_speed == PCI_SPEED_UNKNOWN) {
854 if (slot_avail1 & SLOT_133MHZ_PCIX)
855 bus_speed = PCI_SPEED_133MHz_PCIX;
856 else if (slot_avail1 & SLOT_100MHZ_PCIX)
857 bus_speed = PCI_SPEED_100MHz_PCIX;
858 else if (slot_avail1 & SLOT_66MHZ_PCIX)
859 bus_speed = PCI_SPEED_66MHz_PCIX;
860 else if (slot_avail2 & SLOT_66MHZ)
861 bus_speed = PCI_SPEED_66MHz;
862 else if (slot_avail1 & SLOT_33MHZ)
863 bus_speed = PCI_SPEED_33MHz;
864 else
865 retval = -ENODEV;
866 }
867
868 bus->max_bus_speed = bus_speed;
869 ctrl_dbg(ctrl, "Max bus speed = %d\n", bus_speed);
870
871 return retval;
872 }
873
874 static const struct hpc_ops shpchp_hpc_ops = {
875 .power_on_slot = hpc_power_on_slot,
876 .slot_enable = hpc_slot_enable,
877 .slot_disable = hpc_slot_disable,
878 .set_bus_speed_mode = hpc_set_bus_speed_mode,
879 .set_attention_status = hpc_set_attention_status,
880 .get_power_status = hpc_get_power_status,
881 .get_attention_status = hpc_get_attention_status,
882 .get_latch_status = hpc_get_latch_status,
883 .get_adapter_status = hpc_get_adapter_status,
884
885 .get_adapter_speed = hpc_get_adapter_speed,
886 .get_prog_int = hpc_get_prog_int,
887
888 .query_power_fault = hpc_query_power_fault,
889 .green_led_on = hpc_set_green_led_on,
890 .green_led_off = hpc_set_green_led_off,
891 .green_led_blink = hpc_set_green_led_blink,
892
893 .release_ctlr = hpc_release_ctlr,
894 };
895
shpc_init(struct controller * ctrl,struct pci_dev * pdev)896 int shpc_init(struct controller *ctrl, struct pci_dev *pdev)
897 {
898 int rc = -1, num_slots = 0;
899 u8 hp_slot;
900 u32 shpc_base_offset;
901 u32 tempdword, slot_reg, slot_config;
902 u8 i;
903
904 ctrl->pci_dev = pdev; /* pci_dev of the P2P bridge */
905 ctrl_dbg(ctrl, "Hotplug Controller:\n");
906
907 if (pdev->vendor == PCI_VENDOR_ID_AMD &&
908 pdev->device == PCI_DEVICE_ID_AMD_GOLAM_7450) {
909 /* amd shpc driver doesn't use Base Offset; assume 0 */
910 ctrl->mmio_base = pci_resource_start(pdev, 0);
911 ctrl->mmio_size = pci_resource_len(pdev, 0);
912 } else {
913 ctrl->cap_offset = pci_find_capability(pdev, PCI_CAP_ID_SHPC);
914 if (!ctrl->cap_offset) {
915 ctrl_err(ctrl, "Cannot find PCI capability\n");
916 goto abort;
917 }
918 ctrl_dbg(ctrl, " cap_offset = %x\n", ctrl->cap_offset);
919
920 rc = shpc_indirect_read(ctrl, 0, &shpc_base_offset);
921 if (rc) {
922 ctrl_err(ctrl, "Cannot read base_offset\n");
923 goto abort;
924 }
925
926 rc = shpc_indirect_read(ctrl, 3, &tempdword);
927 if (rc) {
928 ctrl_err(ctrl, "Cannot read slot config\n");
929 goto abort;
930 }
931 num_slots = tempdword & SLOT_NUM;
932 ctrl_dbg(ctrl, " num_slots (indirect) %x\n", num_slots);
933
934 for (i = 0; i < 9 + num_slots; i++) {
935 rc = shpc_indirect_read(ctrl, i, &tempdword);
936 if (rc) {
937 ctrl_err(ctrl, "Cannot read creg (index = %d)\n",
938 i);
939 goto abort;
940 }
941 ctrl_dbg(ctrl, " offset %d: value %x\n", i, tempdword);
942 }
943
944 ctrl->mmio_base =
945 pci_resource_start(pdev, 0) + shpc_base_offset;
946 ctrl->mmio_size = 0x24 + 0x4 * num_slots;
947 }
948
949 ctrl_info(ctrl, "HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
950 pdev->vendor, pdev->device, pdev->subsystem_vendor,
951 pdev->subsystem_device);
952
953 rc = pci_enable_device(pdev);
954 if (rc) {
955 ctrl_err(ctrl, "pci_enable_device failed\n");
956 goto abort;
957 }
958
959 if (!request_mem_region(ctrl->mmio_base, ctrl->mmio_size, MY_NAME)) {
960 ctrl_err(ctrl, "Cannot reserve MMIO region\n");
961 rc = -1;
962 goto abort;
963 }
964
965 ctrl->creg = ioremap(ctrl->mmio_base, ctrl->mmio_size);
966 if (!ctrl->creg) {
967 ctrl_err(ctrl, "Cannot remap MMIO region %lx @ %lx\n",
968 ctrl->mmio_size, ctrl->mmio_base);
969 release_mem_region(ctrl->mmio_base, ctrl->mmio_size);
970 rc = -1;
971 goto abort;
972 }
973 ctrl_dbg(ctrl, "ctrl->creg %p\n", ctrl->creg);
974
975 mutex_init(&ctrl->crit_sect);
976 mutex_init(&ctrl->cmd_lock);
977
978 /* Setup wait queue */
979 init_waitqueue_head(&ctrl->queue);
980
981 ctrl->hpc_ops = &shpchp_hpc_ops;
982
983 /* Return PCI Controller Info */
984 slot_config = shpc_readl(ctrl, SLOT_CONFIG);
985 ctrl->slot_device_offset = (slot_config & FIRST_DEV_NUM) >> 8;
986 ctrl->num_slots = slot_config & SLOT_NUM;
987 ctrl->first_slot = (slot_config & PSN) >> 16;
988 ctrl->slot_num_inc = ((slot_config & UPDOWN) >> 29) ? 1 : -1;
989
990 /* Mask Global Interrupt Mask & Command Complete Interrupt Mask */
991 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
992 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
993 tempdword |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK |
994 COMMAND_INTR_MASK | ARBITER_SERR_MASK);
995 tempdword &= ~SERR_INTR_RSVDZ_MASK;
996 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
997 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
998 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
999
1000 /* Mask the MRL sensor SERR Mask of individual slot in
1001 * Slot SERR-INT Mask & clear all the existing event if any
1002 */
1003 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1004 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1005 ctrl_dbg(ctrl, "Default Logical Slot Register %d value %x\n",
1006 hp_slot, slot_reg);
1007 slot_reg |= (PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1008 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1009 CON_PFAULT_INTR_MASK | MRL_CHANGE_SERR_MASK |
1010 CON_PFAULT_SERR_MASK);
1011 slot_reg &= ~SLOT_REG_RSVDZ_MASK;
1012 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1013 }
1014
1015 if (shpchp_poll_mode) {
1016 /* Install interrupt polling timer. Start with 10 sec delay */
1017 timer_setup(&ctrl->poll_timer, int_poll_timeout, 0);
1018 start_int_poll_timer(ctrl, 10);
1019 } else {
1020 /* Installs the interrupt handler */
1021 rc = pci_enable_msi(pdev);
1022 if (rc) {
1023 ctrl_info(ctrl, "Can't get msi for the hotplug controller\n");
1024 ctrl_info(ctrl, "Use INTx for the hotplug controller\n");
1025 } else {
1026 pci_set_master(pdev);
1027 }
1028
1029 rc = request_irq(ctrl->pci_dev->irq, shpc_isr, IRQF_SHARED,
1030 MY_NAME, (void *)ctrl);
1031 ctrl_dbg(ctrl, "request_irq %d (returns %d)\n",
1032 ctrl->pci_dev->irq, rc);
1033 if (rc) {
1034 ctrl_err(ctrl, "Can't get irq %d for the hotplug controller\n",
1035 ctrl->pci_dev->irq);
1036 goto abort_iounmap;
1037 }
1038 }
1039 ctrl_dbg(ctrl, "HPC at %s irq=%x\n", pci_name(pdev), pdev->irq);
1040
1041 shpc_get_max_bus_speed(ctrl);
1042 shpc_get_cur_bus_speed(ctrl);
1043
1044 /*
1045 * Unmask all event interrupts of all slots
1046 */
1047 for (hp_slot = 0; hp_slot < ctrl->num_slots; hp_slot++) {
1048 slot_reg = shpc_readl(ctrl, SLOT_REG(hp_slot));
1049 ctrl_dbg(ctrl, "Default Logical Slot Register %d value %x\n",
1050 hp_slot, slot_reg);
1051 slot_reg &= ~(PRSNT_CHANGE_INTR_MASK | ISO_PFAULT_INTR_MASK |
1052 BUTTON_PRESS_INTR_MASK | MRL_CHANGE_INTR_MASK |
1053 CON_PFAULT_INTR_MASK | SLOT_REG_RSVDZ_MASK);
1054 shpc_writel(ctrl, SLOT_REG(hp_slot), slot_reg);
1055 }
1056 if (!shpchp_poll_mode) {
1057 /* Unmask all general input interrupts and SERR */
1058 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1059 tempdword &= ~(GLOBAL_INTR_MASK | COMMAND_INTR_MASK |
1060 SERR_INTR_RSVDZ_MASK);
1061 shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword);
1062 tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE);
1063 ctrl_dbg(ctrl, "SERR_INTR_ENABLE = %x\n", tempdword);
1064 }
1065
1066 return 0;
1067
1068 /* We end up here for the many possible ways to fail this API. */
1069 abort_iounmap:
1070 iounmap(ctrl->creg);
1071 abort:
1072 return rc;
1073 }
1074