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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Standard Hot Plug Controller Driver4 *5 * Copyright (C) 1995,2001 Compaq Computer Corporation6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)7 * Copyright (C) 2001 IBM Corp.8 * Copyright (C) 2003-2004 Intel Corporation9 *10 * All rights reserved.11 *12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>13 *14 */15 16#include <linux/module.h>17#include <linux/kernel.h>18#include <linux/types.h>19#include <linux/slab.h>20#include <linux/pci.h>21#include "../pci.h"22#include "shpchp.h"23 24static void interrupt_event_handler(struct work_struct *work);25static int shpchp_enable_slot(struct slot *p_slot);26static int shpchp_disable_slot(struct slot *p_slot);27 28static int queue_interrupt_event(struct slot *p_slot, u32 event_type)29{30 struct event_info *info;31 32 info = kmalloc(sizeof(*info), GFP_ATOMIC);33 if (!info)34 return -ENOMEM;35 36 info->event_type = event_type;37 info->p_slot = p_slot;38 INIT_WORK(&info->work, interrupt_event_handler);39 40 queue_work(p_slot->wq, &info->work);41 42 return 0;43}44 45u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)46{47 struct slot *p_slot;48 u32 event_type;49 50 /* Attention Button Change */51 ctrl_dbg(ctrl, "Attention button interrupt received\n");52 53 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);54 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);55 56 /*57 * Button pressed - See if need to TAKE ACTION!!!58 */59 ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));60 event_type = INT_BUTTON_PRESS;61 62 queue_interrupt_event(p_slot, event_type);63 64 return 0;65 66}67 68u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)69{70 struct slot *p_slot;71 u8 getstatus;72 u32 event_type;73 74 /* Switch Change */75 ctrl_dbg(ctrl, "Switch interrupt received\n");76 77 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);78 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);79 shpchp_get_latch_status(p_slot, &getstatus);80 ctrl_dbg(ctrl, "Card present %x Power status %x\n",81 p_slot->presence_save, p_slot->pwr_save);82 83 if (getstatus) {84 /*85 * Switch opened86 */87 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));88 event_type = INT_SWITCH_OPEN;89 if (p_slot->pwr_save && p_slot->presence_save) {90 event_type = INT_POWER_FAULT;91 ctrl_err(ctrl, "Surprise Removal of card\n");92 }93 } else {94 /*95 * Switch closed96 */97 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));98 event_type = INT_SWITCH_CLOSE;99 }100 101 queue_interrupt_event(p_slot, event_type);102 103 return 1;104}105 106u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)107{108 struct slot *p_slot;109 u32 event_type;110 111 /* Presence Change */112 ctrl_dbg(ctrl, "Presence/Notify input change\n");113 114 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);115 116 /*117 * Save the presence state118 */119 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);120 if (p_slot->presence_save) {121 /*122 * Card Present123 */124 ctrl_info(ctrl, "Card present on Slot(%s)\n",125 slot_name(p_slot));126 event_type = INT_PRESENCE_ON;127 } else {128 /*129 * Not Present130 */131 ctrl_info(ctrl, "Card not present on Slot(%s)\n",132 slot_name(p_slot));133 event_type = INT_PRESENCE_OFF;134 }135 136 queue_interrupt_event(p_slot, event_type);137 138 return 1;139}140 141u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)142{143 struct slot *p_slot;144 u32 event_type;145 146 /* Power fault */147 ctrl_dbg(ctrl, "Power fault interrupt received\n");148 149 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);150 151 if (!(shpchp_query_power_fault(p_slot))) {152 /*153 * Power fault Cleared154 */155 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",156 slot_name(p_slot));157 p_slot->status = 0x00;158 event_type = INT_POWER_FAULT_CLEAR;159 } else {160 /*161 * Power fault162 */163 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));164 event_type = INT_POWER_FAULT;165 /* set power fault status for this board */166 p_slot->status = 0xFF;167 ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);168 }169 170 queue_interrupt_event(p_slot, event_type);171 172 return 1;173}174 175/* The following routines constitute the bulk of the176 hotplug controller logic177 */178static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,179 enum pci_bus_speed speed)180{181 int rc = 0;182 183 ctrl_dbg(ctrl, "Change speed to %d\n", speed);184 rc = shpchp_set_bus_speed_mode(p_slot, speed);185 if (rc) {186 ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",187 __func__);188 return WRONG_BUS_FREQUENCY;189 }190 return rc;191}192 193static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,194 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,195 enum pci_bus_speed msp)196{197 int rc = 0;198 199 /*200 * If other slots on the same bus are occupied, we cannot201 * change the bus speed.202 */203 if (flag) {204 if (asp < bsp) {205 ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n",206 bsp, asp);207 rc = WRONG_BUS_FREQUENCY;208 }209 return rc;210 }211 212 if (asp < msp) {213 if (bsp != asp)214 rc = change_bus_speed(ctrl, pslot, asp);215 } else {216 if (bsp != msp)217 rc = change_bus_speed(ctrl, pslot, msp);218 }219 return rc;220}221 222/**223 * board_added - Called after a board has been added to the system.224 * @p_slot: target &slot225 *226 * Turns power on for the board.227 * Configures board.228 */229static int board_added(struct slot *p_slot)230{231 u8 hp_slot;232 u8 slots_not_empty = 0;233 int rc = 0;234 enum pci_bus_speed asp, bsp, msp;235 struct controller *ctrl = p_slot->ctrl;236 struct pci_bus *parent = ctrl->pci_dev->subordinate;237 238 hp_slot = p_slot->device - ctrl->slot_device_offset;239 240 ctrl_dbg(ctrl, "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",241 __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);242 243 /* Power on slot without connecting to bus */244 rc = shpchp_power_on_slot(p_slot);245 if (rc) {246 ctrl_err(ctrl, "Failed to power on slot\n");247 return -1;248 }249 250 if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {251 rc = shpchp_set_bus_speed_mode(p_slot, PCI_SPEED_33MHz);252 if (rc) {253 ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",254 __func__);255 return WRONG_BUS_FREQUENCY;256 }257 258 /* turn on board, blink green LED, turn off Amber LED */259 rc = shpchp_slot_enable(p_slot);260 if (rc) {261 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");262 return rc;263 }264 }265 266 rc = shpchp_get_adapter_speed(p_slot, &asp);267 if (rc) {268 ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n");269 return WRONG_BUS_FREQUENCY;270 }271 272 bsp = ctrl->pci_dev->subordinate->cur_bus_speed;273 msp = ctrl->pci_dev->subordinate->max_bus_speed;274 275 /* Check if there are other slots or devices on the same bus */276 if (!list_empty(&ctrl->pci_dev->subordinate->devices))277 slots_not_empty = 1;278 279 ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n",280 __func__, slots_not_empty, asp,281 bsp, msp);282 283 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);284 if (rc)285 return rc;286 287 /* turn on board, blink green LED, turn off Amber LED */288 rc = shpchp_slot_enable(p_slot);289 if (rc) {290 ctrl_err(ctrl, "Issue of Slot Enable command failed\n");291 return rc;292 }293 294 /* Wait for ~1 second */295 msleep(1000);296 297 ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);298 /* Check for a power fault */299 if (p_slot->status == 0xFF) {300 /* power fault occurred, but it was benign */301 ctrl_dbg(ctrl, "%s: Power fault\n", __func__);302 p_slot->status = 0;303 goto err_exit;304 }305 306 if (shpchp_configure_device(p_slot)) {307 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",308 pci_domain_nr(parent), p_slot->bus, p_slot->device);309 goto err_exit;310 }311 312 p_slot->status = 0;313 p_slot->is_a_board = 0x01;314 p_slot->pwr_save = 1;315 316 shpchp_green_led_on(p_slot);317 318 return 0;319 320err_exit:321 /* turn off slot, turn on Amber LED, turn off Green LED */322 rc = shpchp_slot_disable(p_slot);323 if (rc) {324 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",325 __func__);326 return rc;327 }328 329 return(rc);330}331 332 333/**334 * remove_board - Turns off slot and LEDs335 * @p_slot: target &slot336 */337static int remove_board(struct slot *p_slot)338{339 struct controller *ctrl = p_slot->ctrl;340 u8 hp_slot;341 int rc;342 343 shpchp_unconfigure_device(p_slot);344 345 hp_slot = p_slot->device - ctrl->slot_device_offset;346 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);347 348 ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);349 350 /* Change status to shutdown */351 if (p_slot->is_a_board)352 p_slot->status = 0x01;353 354 /* turn off slot, turn on Amber LED, turn off Green LED */355 rc = shpchp_slot_disable(p_slot);356 if (rc) {357 ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",358 __func__);359 return rc;360 }361 362 rc = shpchp_set_attention_status(p_slot, 0);363 if (rc) {364 ctrl_err(ctrl, "Issue of Set Attention command failed\n");365 return rc;366 }367 368 p_slot->pwr_save = 0;369 p_slot->is_a_board = 0;370 371 return 0;372}373 374 375struct pushbutton_work_info {376 struct slot *p_slot;377 struct work_struct work;378};379 380/**381 * shpchp_pushbutton_thread - handle pushbutton events382 * @work: &struct work_struct to be handled383 *384 * Scheduled procedure to handle blocking stuff for the pushbuttons.385 * Handles all pending events and exits.386 */387static void shpchp_pushbutton_thread(struct work_struct *work)388{389 struct pushbutton_work_info *info =390 container_of(work, struct pushbutton_work_info, work);391 struct slot *p_slot = info->p_slot;392 393 mutex_lock(&p_slot->lock);394 switch (p_slot->state) {395 case POWEROFF_STATE:396 mutex_unlock(&p_slot->lock);397 shpchp_disable_slot(p_slot);398 mutex_lock(&p_slot->lock);399 p_slot->state = STATIC_STATE;400 break;401 case POWERON_STATE:402 mutex_unlock(&p_slot->lock);403 if (shpchp_enable_slot(p_slot))404 shpchp_green_led_off(p_slot);405 mutex_lock(&p_slot->lock);406 p_slot->state = STATIC_STATE;407 break;408 default:409 break;410 }411 mutex_unlock(&p_slot->lock);412 413 kfree(info);414}415 416void shpchp_queue_pushbutton_work(struct work_struct *work)417{418 struct slot *p_slot = container_of(work, struct slot, work.work);419 struct pushbutton_work_info *info;420 421 info = kmalloc(sizeof(*info), GFP_KERNEL);422 if (!info) {423 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",424 __func__);425 return;426 }427 info->p_slot = p_slot;428 INIT_WORK(&info->work, shpchp_pushbutton_thread);429 430 mutex_lock(&p_slot->lock);431 switch (p_slot->state) {432 case BLINKINGOFF_STATE:433 p_slot->state = POWEROFF_STATE;434 break;435 case BLINKINGON_STATE:436 p_slot->state = POWERON_STATE;437 break;438 default:439 kfree(info);440 goto out;441 }442 queue_work(p_slot->wq, &info->work);443 out:444 mutex_unlock(&p_slot->lock);445}446 447static void update_slot_info(struct slot *slot)448{449 shpchp_get_power_status(slot, &slot->pwr_save);450 shpchp_get_attention_status(slot, &slot->attention_save);451 shpchp_get_latch_status(slot, &slot->latch_save);452 shpchp_get_adapter_status(slot, &slot->presence_save);453}454 455/*456 * Note: This function must be called with slot->lock held457 */458static void handle_button_press_event(struct slot *p_slot)459{460 u8 getstatus;461 struct controller *ctrl = p_slot->ctrl;462 463 switch (p_slot->state) {464 case STATIC_STATE:465 shpchp_get_power_status(p_slot, &getstatus);466 if (getstatus) {467 p_slot->state = BLINKINGOFF_STATE;468 ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",469 slot_name(p_slot));470 } else {471 p_slot->state = BLINKINGON_STATE;472 ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",473 slot_name(p_slot));474 }475 /* blink green LED and turn off amber */476 shpchp_green_led_blink(p_slot);477 shpchp_set_attention_status(p_slot, 0);478 479 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);480 break;481 case BLINKINGOFF_STATE:482 case BLINKINGON_STATE:483 /*484 * Cancel if we are still blinking; this means that we485 * press the attention again before the 5 sec. limit486 * expires to cancel hot-add or hot-remove487 */488 ctrl_info(ctrl, "Button cancel on Slot(%s)\n",489 slot_name(p_slot));490 cancel_delayed_work(&p_slot->work);491 if (p_slot->state == BLINKINGOFF_STATE)492 shpchp_green_led_on(p_slot);493 else494 shpchp_green_led_off(p_slot);495 shpchp_set_attention_status(p_slot, 0);496 ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",497 slot_name(p_slot));498 p_slot->state = STATIC_STATE;499 break;500 case POWEROFF_STATE:501 case POWERON_STATE:502 /*503 * Ignore if the slot is on power-on or power-off state;504 * this means that the previous attention button action505 * to hot-add or hot-remove is undergoing506 */507 ctrl_info(ctrl, "Button ignore on Slot(%s)\n",508 slot_name(p_slot));509 update_slot_info(p_slot);510 break;511 default:512 ctrl_warn(ctrl, "Not a valid state\n");513 break;514 }515}516 517static void interrupt_event_handler(struct work_struct *work)518{519 struct event_info *info = container_of(work, struct event_info, work);520 struct slot *p_slot = info->p_slot;521 522 mutex_lock(&p_slot->lock);523 switch (info->event_type) {524 case INT_BUTTON_PRESS:525 handle_button_press_event(p_slot);526 break;527 case INT_POWER_FAULT:528 ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);529 shpchp_set_attention_status(p_slot, 1);530 shpchp_green_led_off(p_slot);531 break;532 default:533 update_slot_info(p_slot);534 break;535 }536 mutex_unlock(&p_slot->lock);537 538 kfree(info);539}540 541 542static int shpchp_enable_slot (struct slot *p_slot)543{544 u8 getstatus = 0;545 int rc, retval = -ENODEV;546 struct controller *ctrl = p_slot->ctrl;547 548 /* Check to see if (latch closed, card present, power off) */549 mutex_lock(&p_slot->ctrl->crit_sect);550 rc = shpchp_get_adapter_status(p_slot, &getstatus);551 if (rc || !getstatus) {552 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));553 goto out;554 }555 rc = shpchp_get_latch_status(p_slot, &getstatus);556 if (rc || getstatus) {557 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));558 goto out;559 }560 rc = shpchp_get_power_status(p_slot, &getstatus);561 if (rc || getstatus) {562 ctrl_info(ctrl, "Already enabled on slot(%s)\n",563 slot_name(p_slot));564 goto out;565 }566 567 p_slot->is_a_board = 1;568 569 /* We have to save the presence info for these slots */570 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);571 shpchp_get_power_status(p_slot, &p_slot->pwr_save);572 ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);573 shpchp_get_latch_status(p_slot, &getstatus);574 575 if ((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD &&576 p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458)577 && p_slot->ctrl->num_slots == 1) {578 /* handle AMD POGO errata; this must be done before enable */579 amd_pogo_errata_save_misc_reg(p_slot);580 retval = board_added(p_slot);581 /* handle AMD POGO errata; this must be done after enable */582 amd_pogo_errata_restore_misc_reg(p_slot);583 } else584 retval = board_added(p_slot);585 586 if (retval) {587 shpchp_get_adapter_status(p_slot, &p_slot->presence_save);588 shpchp_get_latch_status(p_slot, &getstatus);589 }590 591 update_slot_info(p_slot);592 out:593 mutex_unlock(&p_slot->ctrl->crit_sect);594 return retval;595}596 597 598static int shpchp_disable_slot (struct slot *p_slot)599{600 u8 getstatus = 0;601 int rc, retval = -ENODEV;602 struct controller *ctrl = p_slot->ctrl;603 604 if (!p_slot->ctrl)605 return -ENODEV;606 607 /* Check to see if (latch closed, card present, power on) */608 mutex_lock(&p_slot->ctrl->crit_sect);609 610 rc = shpchp_get_adapter_status(p_slot, &getstatus);611 if (rc || !getstatus) {612 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));613 goto out;614 }615 rc = shpchp_get_latch_status(p_slot, &getstatus);616 if (rc || getstatus) {617 ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));618 goto out;619 }620 rc = shpchp_get_power_status(p_slot, &getstatus);621 if (rc || !getstatus) {622 ctrl_info(ctrl, "Already disabled on slot(%s)\n",623 slot_name(p_slot));624 goto out;625 }626 627 retval = remove_board(p_slot);628 update_slot_info(p_slot);629 out:630 mutex_unlock(&p_slot->ctrl->crit_sect);631 return retval;632}633 634int shpchp_sysfs_enable_slot(struct slot *p_slot)635{636 int retval = -ENODEV;637 struct controller *ctrl = p_slot->ctrl;638 639 mutex_lock(&p_slot->lock);640 switch (p_slot->state) {641 case BLINKINGON_STATE:642 cancel_delayed_work(&p_slot->work);643 fallthrough;644 case STATIC_STATE:645 p_slot->state = POWERON_STATE;646 mutex_unlock(&p_slot->lock);647 retval = shpchp_enable_slot(p_slot);648 mutex_lock(&p_slot->lock);649 p_slot->state = STATIC_STATE;650 break;651 case POWERON_STATE:652 ctrl_info(ctrl, "Slot %s is already in powering on state\n",653 slot_name(p_slot));654 break;655 case BLINKINGOFF_STATE:656 case POWEROFF_STATE:657 ctrl_info(ctrl, "Already enabled on slot %s\n",658 slot_name(p_slot));659 break;660 default:661 ctrl_err(ctrl, "Not a valid state on slot %s\n",662 slot_name(p_slot));663 break;664 }665 mutex_unlock(&p_slot->lock);666 667 return retval;668}669 670int shpchp_sysfs_disable_slot(struct slot *p_slot)671{672 int retval = -ENODEV;673 struct controller *ctrl = p_slot->ctrl;674 675 mutex_lock(&p_slot->lock);676 switch (p_slot->state) {677 case BLINKINGOFF_STATE:678 cancel_delayed_work(&p_slot->work);679 fallthrough;680 case STATIC_STATE:681 p_slot->state = POWEROFF_STATE;682 mutex_unlock(&p_slot->lock);683 retval = shpchp_disable_slot(p_slot);684 mutex_lock(&p_slot->lock);685 p_slot->state = STATIC_STATE;686 break;687 case POWEROFF_STATE:688 ctrl_info(ctrl, "Slot %s is already in powering off state\n",689 slot_name(p_slot));690 break;691 case BLINKINGON_STATE:692 case POWERON_STATE:693 ctrl_info(ctrl, "Already disabled on slot %s\n",694 slot_name(p_slot));695 break;696 default:697 ctrl_err(ctrl, "Not a valid state on slot %s\n",698 slot_name(p_slot));699 break;700 }701 mutex_unlock(&p_slot->lock);702 703 return retval;704}705