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->pcie->port;
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->pcie->port;
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->pcie->port;
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->pcie->port;
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_set_attention_status(struct slot *slot, u8 value)
427 struct controller *ctrl = slot->ctrl;
432 cmd_mask = PCI_EXP_SLTCTL_AIC;
434 case 0 : /* turn off */
437 case 1: /* turn on */
440 case 2: /* turn blink */
446 rc = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
447 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
448 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
453 static void hpc_set_green_led_on(struct slot *slot)
455 struct controller *ctrl = slot->ctrl;
460 cmd_mask = PCI_EXP_SLTCTL_PIC;
461 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
462 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
463 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
466 static void hpc_set_green_led_off(struct slot *slot)
468 struct controller *ctrl = slot->ctrl;
473 cmd_mask = PCI_EXP_SLTCTL_PIC;
474 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
475 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
476 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
479 static void hpc_set_green_led_blink(struct slot *slot)
481 struct controller *ctrl = slot->ctrl;
486 cmd_mask = PCI_EXP_SLTCTL_PIC;
487 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
488 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
489 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
492 static int hpc_power_on_slot(struct slot * slot)
494 struct controller *ctrl = slot->ctrl;
500 /* Clear sticky power-fault bit from previous power failures */
501 retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
503 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
507 slot_status &= PCI_EXP_SLTSTA_PFD;
509 retval = pciehp_writew(ctrl, PCI_EXP_SLTSTA, slot_status);
512 "%s: Cannot write to SLOTSTATUS register\n",
519 cmd_mask = PCI_EXP_SLTCTL_PCC;
520 if (!pciehp_poll_mode) {
521 /* Enable power fault detection turned off at power off time */
522 slot_cmd |= PCI_EXP_SLTCTL_PFDE;
523 cmd_mask |= PCI_EXP_SLTCTL_PFDE;
526 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
528 ctrl_err(ctrl, "Write %x command failed!\n", slot_cmd);
531 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
532 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
534 ctrl->power_fault_detected = 0;
538 static inline int pcie_mask_bad_dllp(struct controller *ctrl)
540 struct pci_dev *dev = ctrl->pcie->port;
544 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
547 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
548 if (reg & PCI_ERR_COR_BAD_DLLP)
550 reg |= PCI_ERR_COR_BAD_DLLP;
551 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
555 static inline void pcie_unmask_bad_dllp(struct controller *ctrl)
557 struct pci_dev *dev = ctrl->pcie->port;
561 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
564 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
565 if (!(reg & PCI_ERR_COR_BAD_DLLP))
567 reg &= ~PCI_ERR_COR_BAD_DLLP;
568 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
571 static int hpc_power_off_slot(struct slot * slot)
573 struct controller *ctrl = slot->ctrl;
580 * Set Bad DLLP Mask bit in Correctable Error Mask
581 * Register. This is the workaround against Bad DLLP error
582 * that sometimes happens during turning power off the slot
583 * which conforms to PCI Express 1.0a spec.
585 changed = pcie_mask_bad_dllp(ctrl);
587 slot_cmd = POWER_OFF;
588 cmd_mask = PCI_EXP_SLTCTL_PCC;
589 if (!pciehp_poll_mode) {
590 /* Disable power fault detection */
591 slot_cmd &= ~PCI_EXP_SLTCTL_PFDE;
592 cmd_mask |= PCI_EXP_SLTCTL_PFDE;
595 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
597 ctrl_err(ctrl, "Write command failed!\n");
601 ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
602 __func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
605 pcie_unmask_bad_dllp(ctrl);
610 static irqreturn_t pcie_isr(int irq, void *dev_id)
612 struct controller *ctrl = (struct controller *)dev_id;
613 struct slot *slot = ctrl->slot;
614 u16 detected, intr_loc;
617 * In order to guarantee that all interrupt events are
618 * serviced, we need to re-inspect Slot Status register after
619 * clearing what is presumed to be the last pending interrupt.
623 if (pciehp_readw(ctrl, PCI_EXP_SLTSTA, &detected)) {
624 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS\n",
629 detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
630 PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC |
632 detected &= ~intr_loc;
633 intr_loc |= detected;
636 if (detected && pciehp_writew(ctrl, PCI_EXP_SLTSTA, intr_loc)) {
637 ctrl_err(ctrl, "%s: Cannot write to SLOTSTATUS\n",
643 ctrl_dbg(ctrl, "%s: intr_loc %x\n", __func__, intr_loc);
645 /* Check Command Complete Interrupt Pending */
646 if (intr_loc & PCI_EXP_SLTSTA_CC) {
649 wake_up(&ctrl->queue);
652 if (!(intr_loc & ~PCI_EXP_SLTSTA_CC))
655 /* Check MRL Sensor Changed */
656 if (intr_loc & PCI_EXP_SLTSTA_MRLSC)
657 pciehp_handle_switch_change(slot);
659 /* Check Attention Button Pressed */
660 if (intr_loc & PCI_EXP_SLTSTA_ABP)
661 pciehp_handle_attention_button(slot);
663 /* Check Presence Detect Changed */
664 if (intr_loc & PCI_EXP_SLTSTA_PDC)
665 pciehp_handle_presence_change(slot);
667 /* Check Power Fault Detected */
668 if ((intr_loc & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
669 ctrl->power_fault_detected = 1;
670 pciehp_handle_power_fault(slot);
675 static int hpc_get_max_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
677 struct controller *ctrl = slot->ctrl;
678 enum pcie_link_speed lnk_speed;
682 retval = pciehp_readl(ctrl, PCI_EXP_LNKCAP, &lnk_cap);
684 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
688 switch (lnk_cap & 0x000F) {
690 lnk_speed = PCIE_2_5GB;
693 lnk_speed = PCIE_5_0GB;
696 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
701 ctrl_dbg(ctrl, "Max link speed = %d\n", lnk_speed);
706 static int hpc_get_max_lnk_width(struct slot *slot,
707 enum pcie_link_width *value)
709 struct controller *ctrl = slot->ctrl;
710 enum pcie_link_width lnk_wdth;
714 retval = pciehp_readl(ctrl, PCI_EXP_LNKCAP, &lnk_cap);
716 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
720 switch ((lnk_cap & PCI_EXP_LNKSTA_NLW) >> 4){
722 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
725 lnk_wdth = PCIE_LNK_X1;
728 lnk_wdth = PCIE_LNK_X2;
731 lnk_wdth = PCIE_LNK_X4;
734 lnk_wdth = PCIE_LNK_X8;
737 lnk_wdth = PCIE_LNK_X12;
740 lnk_wdth = PCIE_LNK_X16;
743 lnk_wdth = PCIE_LNK_X32;
746 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
751 ctrl_dbg(ctrl, "Max link width = %d\n", lnk_wdth);
756 static int hpc_get_cur_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
758 struct controller *ctrl = slot->ctrl;
759 enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
763 retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
765 ctrl_err(ctrl, "%s: Cannot read LNKSTATUS register\n",
770 switch (lnk_status & PCI_EXP_LNKSTA_CLS) {
772 lnk_speed = PCIE_2_5GB;
775 lnk_speed = PCIE_5_0GB;
778 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
783 ctrl_dbg(ctrl, "Current link speed = %d\n", lnk_speed);
788 static int hpc_get_cur_lnk_width(struct slot *slot,
789 enum pcie_link_width *value)
791 struct controller *ctrl = slot->ctrl;
792 enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
796 retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
798 ctrl_err(ctrl, "%s: Cannot read LNKSTATUS register\n",
803 switch ((lnk_status & PCI_EXP_LNKSTA_NLW) >> 4){
805 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
808 lnk_wdth = PCIE_LNK_X1;
811 lnk_wdth = PCIE_LNK_X2;
814 lnk_wdth = PCIE_LNK_X4;
817 lnk_wdth = PCIE_LNK_X8;
820 lnk_wdth = PCIE_LNK_X12;
823 lnk_wdth = PCIE_LNK_X16;
826 lnk_wdth = PCIE_LNK_X32;
829 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
834 ctrl_dbg(ctrl, "Current link width = %d\n", lnk_wdth);
839 static void pcie_release_ctrl(struct controller *ctrl);
840 static struct hpc_ops pciehp_hpc_ops = {
841 .power_on_slot = hpc_power_on_slot,
842 .power_off_slot = hpc_power_off_slot,
843 .set_attention_status = hpc_set_attention_status,
844 .get_power_status = hpc_get_power_status,
845 .get_attention_status = hpc_get_attention_status,
846 .get_latch_status = hpc_get_latch_status,
847 .get_adapter_status = hpc_get_adapter_status,
849 .get_max_bus_speed = hpc_get_max_lnk_speed,
850 .get_cur_bus_speed = hpc_get_cur_lnk_speed,
851 .get_max_lnk_width = hpc_get_max_lnk_width,
852 .get_cur_lnk_width = hpc_get_cur_lnk_width,
854 .query_power_fault = hpc_query_power_fault,
855 .green_led_on = hpc_set_green_led_on,
856 .green_led_off = hpc_set_green_led_off,
857 .green_led_blink = hpc_set_green_led_blink,
859 .release_ctlr = pcie_release_ctrl,
860 .check_lnk_status = hpc_check_lnk_status,
863 int pcie_enable_notification(struct controller *ctrl)
867 cmd = PCI_EXP_SLTCTL_PDCE;
868 if (ATTN_BUTTN(ctrl))
869 cmd |= PCI_EXP_SLTCTL_ABPE;
870 if (POWER_CTRL(ctrl))
871 cmd |= PCI_EXP_SLTCTL_PFDE;
873 cmd |= PCI_EXP_SLTCTL_MRLSCE;
874 if (!pciehp_poll_mode)
875 cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE;
877 mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
878 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
879 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
881 if (pcie_write_cmd(ctrl, cmd, mask)) {
882 ctrl_err(ctrl, "Cannot enable software notification\n");
888 static void pcie_disable_notification(struct controller *ctrl)
891 mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
892 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
893 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
894 if (pcie_write_cmd(ctrl, 0, mask))
895 ctrl_warn(ctrl, "Cannot disable software notification\n");
898 int pcie_init_notification(struct controller *ctrl)
900 if (pciehp_request_irq(ctrl))
902 if (pcie_enable_notification(ctrl)) {
903 pciehp_free_irq(ctrl);
906 ctrl->notification_enabled = 1;
910 static void pcie_shutdown_notification(struct controller *ctrl)
912 if (ctrl->notification_enabled) {
913 pcie_disable_notification(ctrl);
914 pciehp_free_irq(ctrl);
915 ctrl->notification_enabled = 0;
919 static int pcie_init_slot(struct controller *ctrl)
923 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
928 slot->hpc_ops = ctrl->hpc_ops;
929 slot->number = PSN(ctrl);
930 mutex_init(&slot->lock);
931 INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
936 static void pcie_cleanup_slot(struct controller *ctrl)
938 struct slot *slot = ctrl->slot;
939 cancel_delayed_work(&slot->work);
940 flush_scheduled_work();
941 flush_workqueue(pciehp_wq);
945 static inline void dbg_ctrl(struct controller *ctrl)
949 struct pci_dev *pdev = ctrl->pcie->port;
954 ctrl_info(ctrl, "Hotplug Controller:\n");
955 ctrl_info(ctrl, " Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n",
956 pci_name(pdev), pdev->irq);
957 ctrl_info(ctrl, " Vendor ID : 0x%04x\n", pdev->vendor);
958 ctrl_info(ctrl, " Device ID : 0x%04x\n", pdev->device);
959 ctrl_info(ctrl, " Subsystem ID : 0x%04x\n",
960 pdev->subsystem_device);
961 ctrl_info(ctrl, " Subsystem Vendor ID : 0x%04x\n",
962 pdev->subsystem_vendor);
963 ctrl_info(ctrl, " PCIe Cap offset : 0x%02x\n", ctrl->cap_base);
964 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
965 if (!pci_resource_len(pdev, i))
967 ctrl_info(ctrl, " PCI resource [%d] : 0x%llx@0x%llx\n",
968 i, (unsigned long long)pci_resource_len(pdev, i),
969 (unsigned long long)pci_resource_start(pdev, i));
971 ctrl_info(ctrl, "Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
972 ctrl_info(ctrl, " Physical Slot Number : %d\n", PSN(ctrl));
973 ctrl_info(ctrl, " Attention Button : %3s\n",
974 ATTN_BUTTN(ctrl) ? "yes" : "no");
975 ctrl_info(ctrl, " Power Controller : %3s\n",
976 POWER_CTRL(ctrl) ? "yes" : "no");
977 ctrl_info(ctrl, " MRL Sensor : %3s\n",
978 MRL_SENS(ctrl) ? "yes" : "no");
979 ctrl_info(ctrl, " Attention Indicator : %3s\n",
980 ATTN_LED(ctrl) ? "yes" : "no");
981 ctrl_info(ctrl, " Power Indicator : %3s\n",
982 PWR_LED(ctrl) ? "yes" : "no");
983 ctrl_info(ctrl, " Hot-Plug Surprise : %3s\n",
984 HP_SUPR_RM(ctrl) ? "yes" : "no");
985 ctrl_info(ctrl, " EMI Present : %3s\n",
986 EMI(ctrl) ? "yes" : "no");
987 ctrl_info(ctrl, " Command Completed : %3s\n",
988 NO_CMD_CMPL(ctrl) ? "no" : "yes");
989 pciehp_readw(ctrl, PCI_EXP_SLTSTA, ®16);
990 ctrl_info(ctrl, "Slot Status : 0x%04x\n", reg16);
991 pciehp_readw(ctrl, PCI_EXP_SLTCTL, ®16);
992 ctrl_info(ctrl, "Slot Control : 0x%04x\n", reg16);
995 struct controller *pcie_init(struct pcie_device *dev)
997 struct controller *ctrl;
998 u32 slot_cap, link_cap;
999 struct pci_dev *pdev = dev->port;
1001 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1003 dev_err(&dev->device, "%s: Out of memory\n", __func__);
1007 ctrl->cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1008 if (!ctrl->cap_base) {
1009 ctrl_err(ctrl, "Cannot find PCI Express capability\n");
1012 if (pciehp_readl(ctrl, PCI_EXP_SLTCAP, &slot_cap)) {
1013 ctrl_err(ctrl, "Cannot read SLOTCAP register\n");
1017 ctrl->slot_cap = slot_cap;
1018 ctrl->hpc_ops = &pciehp_hpc_ops;
1019 mutex_init(&ctrl->ctrl_lock);
1020 init_waitqueue_head(&ctrl->queue);
1023 * Controller doesn't notify of command completion if the "No
1024 * Command Completed Support" bit is set in Slot Capability
1025 * register or the controller supports none of power
1026 * controller, attention led, power led and EMI.
1028 if (NO_CMD_CMPL(ctrl) ||
1029 !(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
1030 ctrl->no_cmd_complete = 1;
1032 /* Check if Data Link Layer Link Active Reporting is implemented */
1033 if (pciehp_readl(ctrl, PCI_EXP_LNKCAP, &link_cap)) {
1034 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
1037 if (link_cap & PCI_EXP_LNKCAP_DLLLARC) {
1038 ctrl_dbg(ctrl, "Link Active Reporting supported\n");
1039 ctrl->link_active_reporting = 1;
1042 /* Clear all remaining event bits in Slot Status register */
1043 if (pciehp_writew(ctrl, PCI_EXP_SLTSTA, 0x1f))
1046 /* Disable sotfware notification */
1047 pcie_disable_notification(ctrl);
1050 * If this is the first controller to be initialized,
1051 * initialize the pciehp work queue
1053 if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
1054 pciehp_wq = create_singlethread_workqueue("pciehpd");
1059 ctrl_info(ctrl, "HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
1060 pdev->vendor, pdev->device, pdev->subsystem_vendor,
1061 pdev->subsystem_device);
1063 if (pcie_init_slot(ctrl))
1074 void pcie_release_ctrl(struct controller *ctrl)
1076 pcie_shutdown_notification(ctrl);
1077 pcie_cleanup_slot(ctrl);
1079 * If this is the last controller to be released, destroy the
1082 if (atomic_dec_and_test(&pciehp_num_controllers))
1083 destroy_workqueue(pciehp_wq);