2 * PCI Express PCI Hot Plug Driver
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
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.
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
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.
26 * Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <linux/signal.h>
34 #include <linux/jiffies.h>
35 #include <linux/timer.h>
36 #include <linux/pci.h>
37 #include <linux/interrupt.h>
38 #include <linux/time.h>
43 static atomic_t pciehp_num_controllers = ATOMIC_INIT(0);
45 static inline int pciehp_readw(struct controller *ctrl, int reg, u16 *value)
47 struct pci_dev *dev = ctrl->pci_dev;
48 return pci_read_config_word(dev, ctrl->cap_base + reg, value);
51 static inline int pciehp_readl(struct controller *ctrl, int reg, u32 *value)
53 struct pci_dev *dev = ctrl->pci_dev;
54 return pci_read_config_dword(dev, ctrl->cap_base + reg, value);
57 static inline int pciehp_writew(struct controller *ctrl, int reg, u16 value)
59 struct pci_dev *dev = ctrl->pci_dev;
60 return pci_write_config_word(dev, ctrl->cap_base + reg, value);
63 static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
65 struct pci_dev *dev = ctrl->pci_dev;
66 return pci_write_config_dword(dev, ctrl->cap_base + reg, value);
69 /* Power Control Command */
71 #define POWER_OFF PCI_EXP_SLTCTL_PCC
73 static irqreturn_t pcie_isr(int irq, void *dev_id);
74 static void start_int_poll_timer(struct controller *ctrl, int sec);
76 /* This is the interrupt polling timeout function. */
77 static void int_poll_timeout(unsigned long data)
79 struct controller *ctrl = (struct controller *)data;
81 /* Poll for interrupt events. regs == NULL => polling */
84 init_timer(&ctrl->poll_timer);
85 if (!pciehp_poll_time)
86 pciehp_poll_time = 2; /* default polling interval is 2 sec */
88 start_int_poll_timer(ctrl, pciehp_poll_time);
91 /* This function starts the interrupt polling timer. */
92 static void start_int_poll_timer(struct controller *ctrl, int sec)
94 /* Clamp to sane value */
95 if ((sec <= 0) || (sec > 60))
98 ctrl->poll_timer.function = &int_poll_timeout;
99 ctrl->poll_timer.data = (unsigned long)ctrl;
100 ctrl->poll_timer.expires = jiffies + sec * HZ;
101 add_timer(&ctrl->poll_timer);
104 static inline int pciehp_request_irq(struct controller *ctrl)
106 int retval, irq = ctrl->pcie->irq;
108 /* Install interrupt polling timer. Start with 10 sec delay */
109 if (pciehp_poll_mode) {
110 init_timer(&ctrl->poll_timer);
111 start_int_poll_timer(ctrl, 10);
115 /* Installs the interrupt handler */
116 retval = request_irq(irq, pcie_isr, IRQF_SHARED, MY_NAME, ctrl);
118 ctrl_err(ctrl, "Cannot get irq %d for the hotplug controller\n",
123 static inline void pciehp_free_irq(struct controller *ctrl)
125 if (pciehp_poll_mode)
126 del_timer_sync(&ctrl->poll_timer);
128 free_irq(ctrl->pcie->irq, ctrl);
131 static int pcie_poll_cmd(struct controller *ctrl)
134 int err, timeout = 1000;
136 err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
137 if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
138 pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
141 while (timeout > 0) {
144 err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
145 if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
146 pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
150 return 0; /* timeout */
153 static void pcie_wait_cmd(struct controller *ctrl, int poll)
155 unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
156 unsigned long timeout = msecs_to_jiffies(msecs);
160 rc = pcie_poll_cmd(ctrl);
162 rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout);
164 ctrl_dbg(ctrl, "Command not completed in 1000 msec\n");
168 * pcie_write_cmd - Issue controller command
169 * @ctrl: controller to which the command is issued
170 * @cmd: command value written to slot control register
171 * @mask: bitmask of slot control register to be modified
173 static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
179 mutex_lock(&ctrl->ctrl_lock);
181 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
183 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
188 if (slot_status & PCI_EXP_SLTSTA_CC) {
189 if (!ctrl->no_cmd_complete) {
191 * After 1 sec and CMD_COMPLETED still not set, just
192 * proceed forward to issue the next command according
193 * to spec. Just print out the error message.
195 ctrl_dbg(ctrl, "CMD_COMPLETED not clear after 1 sec\n");
196 } else if (!NO_CMD_CMPL(ctrl)) {
198 * This controller semms to notify of command completed
199 * event even though it supports none of power
200 * controller, attention led, power led and EMI.
202 ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Need to "
203 "wait for command completed event.\n");
204 ctrl->no_cmd_complete = 0;
206 ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Maybe "
207 "the controller is broken.\n");
211 retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
213 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
218 slot_ctrl |= (cmd & mask);
221 retval = pciehp_writew(ctrl, PCI_EXP_SLTCTL, slot_ctrl);
223 ctrl_err(ctrl, "Cannot write to SLOTCTRL register\n");
226 * Wait for command completion.
228 if (!retval && !ctrl->no_cmd_complete) {
231 * if hotplug interrupt is not enabled or command
232 * completed interrupt is not enabled, we need to poll
233 * command completed event.
235 if (!(slot_ctrl & PCI_EXP_SLTCTL_HPIE) ||
236 !(slot_ctrl & PCI_EXP_SLTCTL_CCIE))
238 pcie_wait_cmd(ctrl, poll);
241 mutex_unlock(&ctrl->ctrl_lock);
245 static inline int check_link_active(struct controller *ctrl)
249 if (pciehp_readw(ctrl, PCI_EXP_LNKSTA, &link_status))
251 return !!(link_status & PCI_EXP_LNKSTA_DLLLA);
254 static void pcie_wait_link_active(struct controller *ctrl)
258 if (check_link_active(ctrl))
260 while (timeout > 0) {
263 if (check_link_active(ctrl))
266 ctrl_dbg(ctrl, "Data Link Layer Link Active not set in 1000 msec\n");
269 static int hpc_check_lnk_status(struct controller *ctrl)
275 * Data Link Layer Link Active Reporting must be capable for
276 * hot-plug capable downstream port. But old controller might
277 * not implement it. In this case, we wait for 1000 ms.
279 if (ctrl->link_active_reporting){
280 /* Wait for Data Link Layer Link Active bit to be set */
281 pcie_wait_link_active(ctrl);
283 * We must wait for 100 ms after the Data Link Layer
284 * Link Active bit reads 1b before initiating a
285 * configuration access to the hot added device.
291 retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
293 ctrl_err(ctrl, "Cannot read LNKSTATUS register\n");
297 ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
298 if ((lnk_status & PCI_EXP_LNKSTA_LT) ||
299 !(lnk_status & PCI_EXP_LNKSTA_NLW)) {
300 ctrl_err(ctrl, "Link Training Error occurs \n");
308 static int hpc_get_attention_status(struct slot *slot, u8 *status)
310 struct controller *ctrl = slot->ctrl;
315 retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
317 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
321 ctrl_dbg(ctrl, "%s: SLOTCTRL %x, value read %x\n",
322 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_ctrl);
324 atten_led_state = (slot_ctrl & PCI_EXP_SLTCTL_AIC) >> 6;
326 switch (atten_led_state) {
328 *status = 0xFF; /* Reserved */
331 *status = 1; /* On */
334 *status = 2; /* Blink */
337 *status = 0; /* Off */
347 static int hpc_get_power_status(struct slot *slot, u8 *status)
349 struct controller *ctrl = slot->ctrl;
354 retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
356 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
359 ctrl_dbg(ctrl, "%s: SLOTCTRL %x value read %x\n",
360 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_ctrl);
362 pwr_state = (slot_ctrl & PCI_EXP_SLTCTL_PCC) >> 10;
379 static int hpc_get_latch_status(struct slot *slot, u8 *status)
381 struct controller *ctrl = slot->ctrl;
385 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
387 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
391 *status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS);
395 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
397 struct controller *ctrl = slot->ctrl;
401 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
403 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
407 *status = !!(slot_status & PCI_EXP_SLTSTA_PDS);
411 static int hpc_query_power_fault(struct slot *slot)
413 struct controller *ctrl = slot->ctrl;
417 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
419 ctrl_err(ctrl, "Cannot check for power fault\n");
422 return !!(slot_status & PCI_EXP_SLTSTA_PFD);
425 static int hpc_get_emi_status(struct slot *slot, u8 *status)
427 struct controller *ctrl = slot->ctrl;
431 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
433 ctrl_err(ctrl, "Cannot check EMI status\n");
436 *status = !!(slot_status & PCI_EXP_SLTSTA_EIS);
440 static int hpc_toggle_emi(struct slot *slot)
446 slot_cmd = PCI_EXP_SLTCTL_EIC;
447 cmd_mask = PCI_EXP_SLTCTL_EIC;
448 rc = pcie_write_cmd(slot->ctrl, slot_cmd, cmd_mask);
449 slot->last_emi_toggle = get_seconds();
454 static int hpc_set_attention_status(struct slot *slot, u8 value)
456 struct controller *ctrl = slot->ctrl;
461 cmd_mask = PCI_EXP_SLTCTL_AIC;
463 case 0 : /* turn off */
466 case 1: /* turn on */
469 case 2: /* turn blink */
475 rc = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
476 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
477 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
482 static void hpc_set_green_led_on(struct slot *slot)
484 struct controller *ctrl = slot->ctrl;
489 cmd_mask = PCI_EXP_SLTCTL_PIC;
490 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
491 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
492 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
495 static void hpc_set_green_led_off(struct slot *slot)
497 struct controller *ctrl = slot->ctrl;
502 cmd_mask = PCI_EXP_SLTCTL_PIC;
503 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
504 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
505 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
508 static void hpc_set_green_led_blink(struct slot *slot)
510 struct controller *ctrl = slot->ctrl;
515 cmd_mask = PCI_EXP_SLTCTL_PIC;
516 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
517 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
518 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
521 static int hpc_power_on_slot(struct slot * slot)
523 struct controller *ctrl = slot->ctrl;
529 ctrl_dbg(ctrl, "%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
531 /* Clear sticky power-fault bit from previous power failures */
532 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
534 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
538 slot_status &= PCI_EXP_SLTSTA_PFD;
540 retval = pciehp_writew(ctrl, PCI_EXP_SLTSTA, slot_status);
543 "%s: Cannot write to SLOTSTATUS register\n",
550 cmd_mask = PCI_EXP_SLTCTL_PCC;
551 if (!pciehp_poll_mode) {
552 /* Enable power fault detection turned off at power off time */
553 slot_cmd |= PCI_EXP_SLTCTL_PFDE;
554 cmd_mask |= PCI_EXP_SLTCTL_PFDE;
557 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
559 ctrl_err(ctrl, "Write %x command failed!\n", slot_cmd);
562 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
563 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
565 ctrl->power_fault_detected = 0;
569 static inline int pcie_mask_bad_dllp(struct controller *ctrl)
571 struct pci_dev *dev = ctrl->pci_dev;
575 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
578 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
579 if (reg & PCI_ERR_COR_BAD_DLLP)
581 reg |= PCI_ERR_COR_BAD_DLLP;
582 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
586 static inline void pcie_unmask_bad_dllp(struct controller *ctrl)
588 struct pci_dev *dev = ctrl->pci_dev;
592 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
595 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
596 if (!(reg & PCI_ERR_COR_BAD_DLLP))
598 reg &= ~PCI_ERR_COR_BAD_DLLP;
599 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
602 static int hpc_power_off_slot(struct slot * slot)
604 struct controller *ctrl = slot->ctrl;
610 ctrl_dbg(ctrl, "%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
613 * Set Bad DLLP Mask bit in Correctable Error Mask
614 * Register. This is the workaround against Bad DLLP error
615 * that sometimes happens during turning power off the slot
616 * which conforms to PCI Express 1.0a spec.
618 changed = pcie_mask_bad_dllp(ctrl);
620 slot_cmd = POWER_OFF;
621 cmd_mask = PCI_EXP_SLTCTL_PCC;
622 if (!pciehp_poll_mode) {
623 /* Disable power fault detection */
624 slot_cmd &= ~PCI_EXP_SLTCTL_PFDE;
625 cmd_mask |= PCI_EXP_SLTCTL_PFDE;
628 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
630 ctrl_err(ctrl, "Write command failed!\n");
634 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
635 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
638 pcie_unmask_bad_dllp(ctrl);
643 static irqreturn_t pcie_isr(int irq, void *dev_id)
645 struct controller *ctrl = (struct controller *)dev_id;
646 u16 detected, intr_loc;
650 * In order to guarantee that all interrupt events are
651 * serviced, we need to re-inspect Slot Status register after
652 * clearing what is presumed to be the last pending interrupt.
656 if (pciehp_readw(ctrl, PCI_EXP_SLTSTA, &detected)) {
657 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS\n",
662 detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
663 PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC |
665 detected &= ~intr_loc;
666 intr_loc |= detected;
669 if (detected && pciehp_writew(ctrl, PCI_EXP_SLTSTA, intr_loc)) {
670 ctrl_err(ctrl, "%s: Cannot write to SLOTSTATUS\n",
676 ctrl_dbg(ctrl, "%s: intr_loc %x\n", __func__, intr_loc);
678 /* Check Command Complete Interrupt Pending */
679 if (intr_loc & PCI_EXP_SLTSTA_CC) {
682 wake_up(&ctrl->queue);
685 if (!(intr_loc & ~PCI_EXP_SLTSTA_CC))
688 p_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
690 /* Check MRL Sensor Changed */
691 if (intr_loc & PCI_EXP_SLTSTA_MRLSC)
692 pciehp_handle_switch_change(p_slot);
694 /* Check Attention Button Pressed */
695 if (intr_loc & PCI_EXP_SLTSTA_ABP)
696 pciehp_handle_attention_button(p_slot);
698 /* Check Presence Detect Changed */
699 if (intr_loc & PCI_EXP_SLTSTA_PDC)
700 pciehp_handle_presence_change(p_slot);
702 /* Check Power Fault Detected */
703 if ((intr_loc & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
704 ctrl->power_fault_detected = 1;
705 pciehp_handle_power_fault(p_slot);
710 static int hpc_get_max_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
712 struct controller *ctrl = slot->ctrl;
713 enum pcie_link_speed lnk_speed;
717 retval = pciehp_readl(ctrl, PCI_EXP_LNKCAP, &lnk_cap);
719 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
723 switch (lnk_cap & 0x000F) {
725 lnk_speed = PCIE_2PT5GB;
728 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
733 ctrl_dbg(ctrl, "Max link speed = %d\n", lnk_speed);
738 static int hpc_get_max_lnk_width(struct slot *slot,
739 enum pcie_link_width *value)
741 struct controller *ctrl = slot->ctrl;
742 enum pcie_link_width lnk_wdth;
746 retval = pciehp_readl(ctrl, PCI_EXP_LNKCAP, &lnk_cap);
748 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
752 switch ((lnk_cap & PCI_EXP_LNKSTA_NLW) >> 4){
754 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
757 lnk_wdth = PCIE_LNK_X1;
760 lnk_wdth = PCIE_LNK_X2;
763 lnk_wdth = PCIE_LNK_X4;
766 lnk_wdth = PCIE_LNK_X8;
769 lnk_wdth = PCIE_LNK_X12;
772 lnk_wdth = PCIE_LNK_X16;
775 lnk_wdth = PCIE_LNK_X32;
778 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
783 ctrl_dbg(ctrl, "Max link width = %d\n", lnk_wdth);
788 static int hpc_get_cur_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
790 struct controller *ctrl = slot->ctrl;
791 enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
795 retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
797 ctrl_err(ctrl, "%s: Cannot read LNKSTATUS register\n",
802 switch (lnk_status & PCI_EXP_LNKSTA_CLS) {
804 lnk_speed = PCIE_2PT5GB;
807 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
812 ctrl_dbg(ctrl, "Current link speed = %d\n", lnk_speed);
817 static int hpc_get_cur_lnk_width(struct slot *slot,
818 enum pcie_link_width *value)
820 struct controller *ctrl = slot->ctrl;
821 enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
825 retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
827 ctrl_err(ctrl, "%s: Cannot read LNKSTATUS register\n",
832 switch ((lnk_status & PCI_EXP_LNKSTA_NLW) >> 4){
834 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
837 lnk_wdth = PCIE_LNK_X1;
840 lnk_wdth = PCIE_LNK_X2;
843 lnk_wdth = PCIE_LNK_X4;
846 lnk_wdth = PCIE_LNK_X8;
849 lnk_wdth = PCIE_LNK_X12;
852 lnk_wdth = PCIE_LNK_X16;
855 lnk_wdth = PCIE_LNK_X32;
858 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
863 ctrl_dbg(ctrl, "Current link width = %d\n", lnk_wdth);
868 static void pcie_release_ctrl(struct controller *ctrl);
869 static struct hpc_ops pciehp_hpc_ops = {
870 .power_on_slot = hpc_power_on_slot,
871 .power_off_slot = hpc_power_off_slot,
872 .set_attention_status = hpc_set_attention_status,
873 .get_power_status = hpc_get_power_status,
874 .get_attention_status = hpc_get_attention_status,
875 .get_latch_status = hpc_get_latch_status,
876 .get_adapter_status = hpc_get_adapter_status,
877 .get_emi_status = hpc_get_emi_status,
878 .toggle_emi = hpc_toggle_emi,
880 .get_max_bus_speed = hpc_get_max_lnk_speed,
881 .get_cur_bus_speed = hpc_get_cur_lnk_speed,
882 .get_max_lnk_width = hpc_get_max_lnk_width,
883 .get_cur_lnk_width = hpc_get_cur_lnk_width,
885 .query_power_fault = hpc_query_power_fault,
886 .green_led_on = hpc_set_green_led_on,
887 .green_led_off = hpc_set_green_led_off,
888 .green_led_blink = hpc_set_green_led_blink,
890 .release_ctlr = pcie_release_ctrl,
891 .check_lnk_status = hpc_check_lnk_status,
894 int pcie_enable_notification(struct controller *ctrl)
898 cmd = PCI_EXP_SLTCTL_PDCE;
899 if (ATTN_BUTTN(ctrl))
900 cmd |= PCI_EXP_SLTCTL_ABPE;
901 if (POWER_CTRL(ctrl))
902 cmd |= PCI_EXP_SLTCTL_PFDE;
904 cmd |= PCI_EXP_SLTCTL_MRLSCE;
905 if (!pciehp_poll_mode)
906 cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE;
908 mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
909 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
910 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
912 if (pcie_write_cmd(ctrl, cmd, mask)) {
913 ctrl_err(ctrl, "Cannot enable software notification\n");
919 static void pcie_disable_notification(struct controller *ctrl)
922 mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
923 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
924 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
925 if (pcie_write_cmd(ctrl, 0, mask))
926 ctrl_warn(ctrl, "Cannot disable software notification\n");
929 int pcie_init_notification(struct controller *ctrl)
931 if (pciehp_request_irq(ctrl))
933 if (pcie_enable_notification(ctrl)) {
934 pciehp_free_irq(ctrl);
937 ctrl->notification_enabled = 1;
941 static void pcie_shutdown_notification(struct controller *ctrl)
943 if (ctrl->notification_enabled) {
944 pcie_disable_notification(ctrl);
945 pciehp_free_irq(ctrl);
946 ctrl->notification_enabled = 0;
950 static int pcie_init_slot(struct controller *ctrl)
954 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
960 slot->bus = ctrl->pci_dev->subordinate->number;
961 slot->device = ctrl->slot_device_offset + slot->hp_slot;
962 slot->hpc_ops = ctrl->hpc_ops;
963 slot->number = ctrl->first_slot;
964 mutex_init(&slot->lock);
965 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
966 list_add(&slot->slot_list, &ctrl->slot_list);
970 static void pcie_cleanup_slot(struct controller *ctrl)
973 slot = list_first_entry(&ctrl->slot_list, struct slot, slot_list);
974 list_del(&slot->slot_list);
975 cancel_delayed_work(&slot->work);
976 flush_scheduled_work();
977 flush_workqueue(pciehp_wq);
981 static inline void dbg_ctrl(struct controller *ctrl)
985 struct pci_dev *pdev = ctrl->pci_dev;
990 ctrl_info(ctrl, "Hotplug Controller:\n");
991 ctrl_info(ctrl, " Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n",
992 pci_name(pdev), pdev->irq);
993 ctrl_info(ctrl, " Vendor ID : 0x%04x\n", pdev->vendor);
994 ctrl_info(ctrl, " Device ID : 0x%04x\n", pdev->device);
995 ctrl_info(ctrl, " Subsystem ID : 0x%04x\n",
996 pdev->subsystem_device);
997 ctrl_info(ctrl, " Subsystem Vendor ID : 0x%04x\n",
998 pdev->subsystem_vendor);
999 ctrl_info(ctrl, " PCIe Cap offset : 0x%02x\n", ctrl->cap_base);
1000 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1001 if (!pci_resource_len(pdev, i))
1003 ctrl_info(ctrl, " PCI resource [%d] : 0x%llx@0x%llx\n",
1004 i, (unsigned long long)pci_resource_len(pdev, i),
1005 (unsigned long long)pci_resource_start(pdev, i));
1007 ctrl_info(ctrl, "Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
1008 ctrl_info(ctrl, " Physical Slot Number : %d\n", ctrl->first_slot);
1009 ctrl_info(ctrl, " Attention Button : %3s\n",
1010 ATTN_BUTTN(ctrl) ? "yes" : "no");
1011 ctrl_info(ctrl, " Power Controller : %3s\n",
1012 POWER_CTRL(ctrl) ? "yes" : "no");
1013 ctrl_info(ctrl, " MRL Sensor : %3s\n",
1014 MRL_SENS(ctrl) ? "yes" : "no");
1015 ctrl_info(ctrl, " Attention Indicator : %3s\n",
1016 ATTN_LED(ctrl) ? "yes" : "no");
1017 ctrl_info(ctrl, " Power Indicator : %3s\n",
1018 PWR_LED(ctrl) ? "yes" : "no");
1019 ctrl_info(ctrl, " Hot-Plug Surprise : %3s\n",
1020 HP_SUPR_RM(ctrl) ? "yes" : "no");
1021 ctrl_info(ctrl, " EMI Present : %3s\n",
1022 EMI(ctrl) ? "yes" : "no");
1023 ctrl_info(ctrl, " Command Completed : %3s\n",
1024 NO_CMD_CMPL(ctrl) ? "no" : "yes");
1025 pciehp_readw(ctrl, PCI_EXP_SLTSTA, ®16);
1026 ctrl_info(ctrl, "Slot Status : 0x%04x\n", reg16);
1027 pciehp_readw(ctrl, PCI_EXP_SLTCTL, ®16);
1028 ctrl_info(ctrl, "Slot Control : 0x%04x\n", reg16);
1031 struct controller *pcie_init(struct pcie_device *dev)
1033 struct controller *ctrl;
1034 u32 slot_cap, link_cap;
1035 struct pci_dev *pdev = dev->port;
1037 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1039 dev_err(&dev->device, "%s: Out of memory\n", __func__);
1042 INIT_LIST_HEAD(&ctrl->slot_list);
1045 ctrl->pci_dev = pdev;
1046 ctrl->cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1047 if (!ctrl->cap_base) {
1048 ctrl_err(ctrl, "Cannot find PCI Express capability\n");
1051 if (pciehp_readl(ctrl, PCI_EXP_SLTCAP, &slot_cap)) {
1052 ctrl_err(ctrl, "Cannot read SLOTCAP register\n");
1056 ctrl->slot_cap = slot_cap;
1057 ctrl->first_slot = slot_cap >> 19;
1058 ctrl->slot_device_offset = 0;
1059 ctrl->num_slots = 1;
1060 ctrl->hpc_ops = &pciehp_hpc_ops;
1061 mutex_init(&ctrl->crit_sect);
1062 mutex_init(&ctrl->ctrl_lock);
1063 init_waitqueue_head(&ctrl->queue);
1066 * Controller doesn't notify of command completion if the "No
1067 * Command Completed Support" bit is set in Slot Capability
1068 * register or the controller supports none of power
1069 * controller, attention led, power led and EMI.
1071 if (NO_CMD_CMPL(ctrl) ||
1072 !(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
1073 ctrl->no_cmd_complete = 1;
1075 /* Check if Data Link Layer Link Active Reporting is implemented */
1076 if (pciehp_readl(ctrl, PCI_EXP_LNKCAP, &link_cap)) {
1077 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
1080 if (link_cap & PCI_EXP_LNKCAP_DLLLARC) {
1081 ctrl_dbg(ctrl, "Link Active Reporting supported\n");
1082 ctrl->link_active_reporting = 1;
1085 /* Clear all remaining event bits in Slot Status register */
1086 if (pciehp_writew(ctrl, PCI_EXP_SLTSTA, 0x1f))
1089 /* Disable sotfware notification */
1090 pcie_disable_notification(ctrl);
1093 * If this is the first controller to be initialized,
1094 * initialize the pciehp work queue
1096 if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
1097 pciehp_wq = create_singlethread_workqueue("pciehpd");
1102 ctrl_info(ctrl, "HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
1103 pdev->vendor, pdev->device, pdev->subsystem_vendor,
1104 pdev->subsystem_device);
1106 if (pcie_init_slot(ctrl))
1117 void pcie_release_ctrl(struct controller *ctrl)
1119 pcie_shutdown_notification(ctrl);
1120 pcie_cleanup_slot(ctrl);
1122 * If this is the last controller to be released, destroy the
1125 if (atomic_dec_and_test(&pciehp_num_controllers))
1126 destroy_workqueue(pciehp_wq);