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);
61 } __attribute__ ((packed));
63 /* offsets to the controller registers based on the above structure layout */
65 PCIECAPID = offsetof(struct ctrl_reg, cap_id),
66 NXTCAPPTR = offsetof(struct ctrl_reg, nxt_ptr),
67 CAPREG = offsetof(struct ctrl_reg, cap_reg),
68 DEVCAP = offsetof(struct ctrl_reg, dev_cap),
69 DEVCTRL = offsetof(struct ctrl_reg, dev_ctrl),
70 DEVSTATUS = offsetof(struct ctrl_reg, dev_status),
71 LNKCAP = offsetof(struct ctrl_reg, lnk_cap),
72 LNKCTRL = offsetof(struct ctrl_reg, lnk_ctrl),
73 LNKSTATUS = offsetof(struct ctrl_reg, lnk_status),
74 SLOTCAP = offsetof(struct ctrl_reg, slot_cap),
75 SLOTCTRL = offsetof(struct ctrl_reg, slot_ctrl),
76 SLOTSTATUS = offsetof(struct ctrl_reg, slot_status),
77 ROOTCTRL = offsetof(struct ctrl_reg, root_ctrl),
78 ROOTSTATUS = offsetof(struct ctrl_reg, root_status),
81 static inline int pciehp_readw(struct controller *ctrl, int reg, u16 *value)
83 struct pci_dev *dev = ctrl->pci_dev;
84 return pci_read_config_word(dev, ctrl->cap_base + reg, value);
87 static inline int pciehp_readl(struct controller *ctrl, int reg, u32 *value)
89 struct pci_dev *dev = ctrl->pci_dev;
90 return pci_read_config_dword(dev, ctrl->cap_base + reg, value);
93 static inline int pciehp_writew(struct controller *ctrl, int reg, u16 value)
95 struct pci_dev *dev = ctrl->pci_dev;
96 return pci_write_config_word(dev, ctrl->cap_base + reg, value);
99 static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
101 struct pci_dev *dev = ctrl->pci_dev;
102 return pci_write_config_dword(dev, ctrl->cap_base + reg, value);
105 /* Field definitions in PCI Express Capabilities Register */
106 #define CAP_VER 0x000F
107 #define DEV_PORT_TYPE 0x00F0
108 #define SLOT_IMPL 0x0100
109 #define MSG_NUM 0x3E00
111 /* Device or Port Type */
112 #define NAT_ENDPT 0x00
113 #define LEG_ENDPT 0x01
114 #define ROOT_PORT 0x04
115 #define UP_STREAM 0x05
116 #define DN_STREAM 0x06
117 #define PCIE_PCI_BRDG 0x07
118 #define PCI_PCIE_BRDG 0x10
120 /* Field definitions in Device Capabilities Register */
121 #define DATTN_BUTTN_PRSN 0x1000
122 #define DATTN_LED_PRSN 0x2000
123 #define DPWR_LED_PRSN 0x4000
125 /* Field definitions in Link Capabilities Register */
126 #define MAX_LNK_SPEED 0x000F
127 #define MAX_LNK_WIDTH 0x03F0
129 /* Link Width Encoding */
138 /*Field definitions of Link Status Register */
139 #define LNK_SPEED 0x000F
140 #define NEG_LINK_WD 0x03F0
141 #define LNK_TRN_ERR 0x0400
142 #define LNK_TRN 0x0800
143 #define SLOT_CLK_CONF 0x1000
145 /* Field definitions in Slot Capabilities Register */
146 #define ATTN_BUTTN_PRSN 0x00000001
147 #define PWR_CTRL_PRSN 0x00000002
148 #define MRL_SENS_PRSN 0x00000004
149 #define ATTN_LED_PRSN 0x00000008
150 #define PWR_LED_PRSN 0x00000010
151 #define HP_SUPR_RM_SUP 0x00000020
152 #define HP_CAP 0x00000040
153 #define SLOT_PWR_VALUE 0x000003F8
154 #define SLOT_PWR_LIMIT 0x00000C00
155 #define PSN 0xFFF80000 /* PSN: Physical Slot Number */
157 /* Field definitions in Slot Control Register */
158 #define ATTN_BUTTN_ENABLE 0x0001
159 #define PWR_FAULT_DETECT_ENABLE 0x0002
160 #define MRL_DETECT_ENABLE 0x0004
161 #define PRSN_DETECT_ENABLE 0x0008
162 #define CMD_CMPL_INTR_ENABLE 0x0010
163 #define HP_INTR_ENABLE 0x0020
164 #define ATTN_LED_CTRL 0x00C0
165 #define PWR_LED_CTRL 0x0300
166 #define PWR_CTRL 0x0400
167 #define EMI_CTRL 0x0800
169 /* Attention indicator and Power indicator states */
171 #define LED_BLINK 0x10
174 /* Power Control Command */
176 #define POWER_OFF 0x0400
178 /* EMI Status defines */
179 #define EMI_DISENGAGED 0
180 #define EMI_ENGAGED 1
182 /* Field definitions in Slot Status Register */
183 #define ATTN_BUTTN_PRESSED 0x0001
184 #define PWR_FAULT_DETECTED 0x0002
185 #define MRL_SENS_CHANGED 0x0004
186 #define PRSN_DETECT_CHANGED 0x0008
187 #define CMD_COMPLETED 0x0010
188 #define MRL_STATE 0x0020
189 #define PRSN_STATE 0x0040
190 #define EMI_STATE 0x0080
191 #define EMI_STATUS_BIT 7
193 static irqreturn_t pcie_isr(int irq, void *dev_id);
194 static void start_int_poll_timer(struct controller *ctrl, int sec);
196 /* This is the interrupt polling timeout function. */
197 static void int_poll_timeout(unsigned long data)
199 struct controller *ctrl = (struct controller *)data;
201 /* Poll for interrupt events. regs == NULL => polling */
204 init_timer(&ctrl->poll_timer);
205 if (!pciehp_poll_time)
206 pciehp_poll_time = 2; /* default polling interval is 2 sec */
208 start_int_poll_timer(ctrl, pciehp_poll_time);
211 /* This function starts the interrupt polling timer. */
212 static void start_int_poll_timer(struct controller *ctrl, int sec)
214 /* Clamp to sane value */
215 if ((sec <= 0) || (sec > 60))
218 ctrl->poll_timer.function = &int_poll_timeout;
219 ctrl->poll_timer.data = (unsigned long)ctrl;
220 ctrl->poll_timer.expires = jiffies + sec * HZ;
221 add_timer(&ctrl->poll_timer);
224 static inline int pcie_wait_cmd(struct controller *ctrl)
227 unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
228 unsigned long timeout = msecs_to_jiffies(msecs);
231 rc = wait_event_interruptible_timeout(ctrl->queue,
232 !ctrl->cmd_busy, timeout);
234 dbg("Command not completed in 1000 msec\n");
237 info("Command was interrupted by a signal\n");
244 * pcie_write_cmd - Issue controller command
245 * @slot: slot to which the command is issued
246 * @cmd: command value written to slot control register
247 * @mask: bitmask of slot control register to be modified
249 static int pcie_write_cmd(struct slot *slot, u16 cmd, u16 mask)
251 struct controller *ctrl = slot->ctrl;
256 mutex_lock(&ctrl->ctrl_lock);
258 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
260 err("%s: Cannot read SLOTSTATUS register\n", __func__);
264 if ((slot_status & CMD_COMPLETED) == CMD_COMPLETED ) {
265 /* After 1 sec and CMD_COMPLETED still not set, just
266 proceed forward to issue the next command according
267 to spec. Just print out the error message */
268 dbg("%s: CMD_COMPLETED not clear after 1 sec.\n",
272 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
274 err("%s: Cannot read SLOTCTRL register\n", __func__);
279 slot_ctrl |= ((cmd & mask) | CMD_CMPL_INTR_ENABLE);
283 retval = pciehp_writew(ctrl, SLOTCTRL, slot_ctrl);
285 err("%s: Cannot write to SLOTCTRL register\n", __func__);
288 * Wait for command completion.
291 retval = pcie_wait_cmd(ctrl);
293 mutex_unlock(&ctrl->ctrl_lock);
297 static int hpc_check_lnk_status(struct controller *ctrl)
302 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
304 err("%s: Cannot read LNKSTATUS register\n", __func__);
308 dbg("%s: lnk_status = %x\n", __func__, lnk_status);
309 if ( (lnk_status & LNK_TRN) || (lnk_status & LNK_TRN_ERR) ||
310 !(lnk_status & NEG_LINK_WD)) {
311 err("%s : Link Training Error occurs \n", __func__);
319 static int hpc_get_attention_status(struct slot *slot, u8 *status)
321 struct controller *ctrl = slot->ctrl;
326 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
328 err("%s: Cannot read SLOTCTRL register\n", __func__);
332 dbg("%s: SLOTCTRL %x, value read %x\n",
333 __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
335 atten_led_state = (slot_ctrl & ATTN_LED_CTRL) >> 6;
337 switch (atten_led_state) {
339 *status = 0xFF; /* Reserved */
342 *status = 1; /* On */
345 *status = 2; /* Blink */
348 *status = 0; /* Off */
358 static int hpc_get_power_status(struct slot *slot, u8 *status)
360 struct controller *ctrl = slot->ctrl;
365 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
367 err("%s: Cannot read SLOTCTRL register\n", __func__);
370 dbg("%s: SLOTCTRL %x value read %x\n",
371 __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
373 pwr_state = (slot_ctrl & PWR_CTRL) >> 10;
390 static int hpc_get_latch_status(struct slot *slot, u8 *status)
392 struct controller *ctrl = slot->ctrl;
396 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
398 err("%s: Cannot read SLOTSTATUS register\n", __func__);
402 *status = (((slot_status & MRL_STATE) >> 5) == 0) ? 0 : 1;
407 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
409 struct controller *ctrl = slot->ctrl;
414 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
416 err("%s: Cannot read SLOTSTATUS register\n", __func__);
419 card_state = (u8)((slot_status & PRSN_STATE) >> 6);
420 *status = (card_state == 1) ? 1 : 0;
425 static int hpc_query_power_fault(struct slot *slot)
427 struct controller *ctrl = slot->ctrl;
432 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
434 err("%s: Cannot check for power fault\n", __func__);
437 pwr_fault = (u8)((slot_status & PWR_FAULT_DETECTED) >> 1);
442 static int hpc_get_emi_status(struct slot *slot, u8 *status)
444 struct controller *ctrl = slot->ctrl;
448 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
450 err("%s : Cannot check EMI status\n", __func__);
453 *status = (slot_status & EMI_STATE) >> EMI_STATUS_BIT;
458 static int hpc_toggle_emi(struct slot *slot)
466 if (!pciehp_poll_mode) {
467 slot_cmd = slot_cmd | HP_INTR_ENABLE;
468 cmd_mask = cmd_mask | HP_INTR_ENABLE;
471 rc = pcie_write_cmd(slot, slot_cmd, cmd_mask);
472 slot->last_emi_toggle = get_seconds();
477 static int hpc_set_attention_status(struct slot *slot, u8 value)
479 struct controller *ctrl = slot->ctrl;
484 cmd_mask = ATTN_LED_CTRL;
486 case 0 : /* turn off */
489 case 1: /* turn on */
492 case 2: /* turn blink */
498 if (!pciehp_poll_mode) {
499 slot_cmd = slot_cmd | HP_INTR_ENABLE;
500 cmd_mask = cmd_mask | HP_INTR_ENABLE;
503 rc = pcie_write_cmd(slot, slot_cmd, cmd_mask);
504 dbg("%s: SLOTCTRL %x write cmd %x\n",
505 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
510 static void hpc_set_green_led_on(struct slot *slot)
512 struct controller *ctrl = slot->ctrl;
517 cmd_mask = PWR_LED_CTRL;
518 if (!pciehp_poll_mode) {
519 slot_cmd = slot_cmd | HP_INTR_ENABLE;
520 cmd_mask = cmd_mask | HP_INTR_ENABLE;
523 pcie_write_cmd(slot, slot_cmd, cmd_mask);
525 dbg("%s: SLOTCTRL %x write cmd %x\n",
526 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
529 static void hpc_set_green_led_off(struct slot *slot)
531 struct controller *ctrl = slot->ctrl;
536 cmd_mask = PWR_LED_CTRL;
537 if (!pciehp_poll_mode) {
538 slot_cmd = slot_cmd | HP_INTR_ENABLE;
539 cmd_mask = cmd_mask | HP_INTR_ENABLE;
542 pcie_write_cmd(slot, slot_cmd, cmd_mask);
543 dbg("%s: SLOTCTRL %x write cmd %x\n",
544 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
547 static void hpc_set_green_led_blink(struct slot *slot)
549 struct controller *ctrl = slot->ctrl;
554 cmd_mask = PWR_LED_CTRL;
555 if (!pciehp_poll_mode) {
556 slot_cmd = slot_cmd | HP_INTR_ENABLE;
557 cmd_mask = cmd_mask | HP_INTR_ENABLE;
560 pcie_write_cmd(slot, slot_cmd, cmd_mask);
562 dbg("%s: SLOTCTRL %x write cmd %x\n",
563 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
566 static void hpc_release_ctlr(struct controller *ctrl)
568 if (pciehp_poll_mode)
569 del_timer(&ctrl->poll_timer);
571 free_irq(ctrl->pci_dev->irq, ctrl);
574 * If this is the last controller to be released, destroy the
577 if (atomic_dec_and_test(&pciehp_num_controllers))
578 destroy_workqueue(pciehp_wq);
581 static int hpc_power_on_slot(struct slot * slot)
583 struct controller *ctrl = slot->ctrl;
589 dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
591 /* Clear sticky power-fault bit from previous power failures */
592 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
594 err("%s: Cannot read SLOTSTATUS register\n", __func__);
597 slot_status &= PWR_FAULT_DETECTED;
599 retval = pciehp_writew(ctrl, SLOTSTATUS, slot_status);
601 err("%s: Cannot write to SLOTSTATUS register\n",
609 /* Enable detection that we turned off at slot power-off time */
610 if (!pciehp_poll_mode) {
611 slot_cmd = slot_cmd |
612 PWR_FAULT_DETECT_ENABLE |
616 cmd_mask = cmd_mask |
617 PWR_FAULT_DETECT_ENABLE |
623 retval = pcie_write_cmd(slot, slot_cmd, cmd_mask);
626 err("%s: Write %x command failed!\n", __func__, slot_cmd);
629 dbg("%s: SLOTCTRL %x write cmd %x\n",
630 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
635 static inline int pcie_mask_bad_dllp(struct controller *ctrl)
637 struct pci_dev *dev = ctrl->pci_dev;
641 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
644 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
645 if (reg & PCI_ERR_COR_BAD_DLLP)
647 reg |= PCI_ERR_COR_BAD_DLLP;
648 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
652 static inline void pcie_unmask_bad_dllp(struct controller *ctrl)
654 struct pci_dev *dev = ctrl->pci_dev;
658 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
661 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
662 if (!(reg & PCI_ERR_COR_BAD_DLLP))
664 reg &= ~PCI_ERR_COR_BAD_DLLP;
665 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
668 static int hpc_power_off_slot(struct slot * slot)
670 struct controller *ctrl = slot->ctrl;
676 dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
679 * Set Bad DLLP Mask bit in Correctable Error Mask
680 * Register. This is the workaround against Bad DLLP error
681 * that sometimes happens during turning power off the slot
682 * which conforms to PCI Express 1.0a spec.
684 changed = pcie_mask_bad_dllp(ctrl);
686 slot_cmd = POWER_OFF;
689 * If we get MRL or presence detect interrupts now, the isr
690 * will notice the sticky power-fault bit too and issue power
691 * indicator change commands. This will lead to an endless loop
692 * of command completions, since the power-fault bit remains on
693 * till the slot is powered on again.
695 if (!pciehp_poll_mode) {
696 slot_cmd = (slot_cmd &
697 ~PWR_FAULT_DETECT_ENABLE &
699 ~PRSN_DETECT_ENABLE) | HP_INTR_ENABLE;
700 cmd_mask = cmd_mask |
701 PWR_FAULT_DETECT_ENABLE |
707 retval = pcie_write_cmd(slot, slot_cmd, cmd_mask);
709 err("%s: Write command failed!\n", __func__);
713 dbg("%s: SLOTCTRL %x write cmd %x\n",
714 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
717 * After turning power off, we must wait for at least 1 second
718 * before taking any action that relies on power having been
719 * removed from the slot/adapter.
724 pcie_unmask_bad_dllp(ctrl);
729 static irqreturn_t pcie_isr(int irq, void *dev_id)
731 struct controller *ctrl = (struct controller *)dev_id;
732 u16 detected, intr_loc;
735 * In order to guarantee that all interrupt events are
736 * serviced, we need to re-inspect Slot Status register after
737 * clearing what is presumed to be the last pending interrupt.
741 if (pciehp_readw(ctrl, SLOTSTATUS, &detected)) {
742 err("%s: Cannot read SLOTSTATUS\n", __func__);
746 detected &= (ATTN_BUTTN_PRESSED | PWR_FAULT_DETECTED |
747 MRL_SENS_CHANGED | PRSN_DETECT_CHANGED |
749 intr_loc |= detected;
752 if (pciehp_writew(ctrl, SLOTSTATUS, detected)) {
753 err("%s: Cannot write to SLOTSTATUS\n", __func__);
758 dbg("%s: intr_loc %x\n", __FUNCTION__, intr_loc);
760 /* Check Command Complete Interrupt Pending */
761 if (intr_loc & CMD_COMPLETED) {
764 wake_up_interruptible(&ctrl->queue);
767 /* Check MRL Sensor Changed */
768 if (intr_loc & MRL_SENS_CHANGED)
769 pciehp_handle_switch_change(0, ctrl);
771 /* Check Attention Button Pressed */
772 if (intr_loc & ATTN_BUTTN_PRESSED)
773 pciehp_handle_attention_button(0, ctrl);
775 /* Check Presence Detect Changed */
776 if (intr_loc & PRSN_DETECT_CHANGED)
777 pciehp_handle_presence_change(0, ctrl);
779 /* Check Power Fault Detected */
780 if (intr_loc & PWR_FAULT_DETECTED)
781 pciehp_handle_power_fault(0, ctrl);
786 static int hpc_get_max_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
788 struct controller *ctrl = slot->ctrl;
789 enum pcie_link_speed lnk_speed;
793 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
795 err("%s: Cannot read LNKCAP register\n", __func__);
799 switch (lnk_cap & 0x000F) {
801 lnk_speed = PCIE_2PT5GB;
804 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
809 dbg("Max link speed = %d\n", lnk_speed);
814 static int hpc_get_max_lnk_width(struct slot *slot,
815 enum pcie_link_width *value)
817 struct controller *ctrl = slot->ctrl;
818 enum pcie_link_width lnk_wdth;
822 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
824 err("%s: Cannot read LNKCAP register\n", __func__);
828 switch ((lnk_cap & 0x03F0) >> 4){
830 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
833 lnk_wdth = PCIE_LNK_X1;
836 lnk_wdth = PCIE_LNK_X2;
839 lnk_wdth = PCIE_LNK_X4;
842 lnk_wdth = PCIE_LNK_X8;
845 lnk_wdth = PCIE_LNK_X12;
848 lnk_wdth = PCIE_LNK_X16;
851 lnk_wdth = PCIE_LNK_X32;
854 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
859 dbg("Max link width = %d\n", lnk_wdth);
864 static int hpc_get_cur_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
866 struct controller *ctrl = slot->ctrl;
867 enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
871 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
873 err("%s: Cannot read LNKSTATUS register\n", __func__);
877 switch (lnk_status & 0x0F) {
879 lnk_speed = PCIE_2PT5GB;
882 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
887 dbg("Current link speed = %d\n", lnk_speed);
892 static int hpc_get_cur_lnk_width(struct slot *slot,
893 enum pcie_link_width *value)
895 struct controller *ctrl = slot->ctrl;
896 enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
900 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
902 err("%s: Cannot read LNKSTATUS register\n", __func__);
906 switch ((lnk_status & 0x03F0) >> 4){
908 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
911 lnk_wdth = PCIE_LNK_X1;
914 lnk_wdth = PCIE_LNK_X2;
917 lnk_wdth = PCIE_LNK_X4;
920 lnk_wdth = PCIE_LNK_X8;
923 lnk_wdth = PCIE_LNK_X12;
926 lnk_wdth = PCIE_LNK_X16;
929 lnk_wdth = PCIE_LNK_X32;
932 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
937 dbg("Current link width = %d\n", lnk_wdth);
942 static struct hpc_ops pciehp_hpc_ops = {
943 .power_on_slot = hpc_power_on_slot,
944 .power_off_slot = hpc_power_off_slot,
945 .set_attention_status = hpc_set_attention_status,
946 .get_power_status = hpc_get_power_status,
947 .get_attention_status = hpc_get_attention_status,
948 .get_latch_status = hpc_get_latch_status,
949 .get_adapter_status = hpc_get_adapter_status,
950 .get_emi_status = hpc_get_emi_status,
951 .toggle_emi = hpc_toggle_emi,
953 .get_max_bus_speed = hpc_get_max_lnk_speed,
954 .get_cur_bus_speed = hpc_get_cur_lnk_speed,
955 .get_max_lnk_width = hpc_get_max_lnk_width,
956 .get_cur_lnk_width = hpc_get_cur_lnk_width,
958 .query_power_fault = hpc_query_power_fault,
959 .green_led_on = hpc_set_green_led_on,
960 .green_led_off = hpc_set_green_led_off,
961 .green_led_blink = hpc_set_green_led_blink,
963 .release_ctlr = hpc_release_ctlr,
964 .check_lnk_status = hpc_check_lnk_status,
968 int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
971 acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
972 struct pci_dev *pdev = dev;
973 struct pci_bus *parent;
974 struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
977 * Per PCI firmware specification, we should run the ACPI _OSC
978 * method to get control of hotplug hardware before using it.
979 * If an _OSC is missing, we look for an OSHP to do the same thing.
980 * To handle different BIOS behavior, we look for _OSC and OSHP
981 * within the scope of the hotplug controller and its parents, upto
982 * the host bridge under which this controller exists.
986 * This hotplug controller was not listed in the ACPI name
987 * space at all. Try to get acpi handle of parent pci bus.
989 if (!pdev || !pdev->bus->parent)
991 parent = pdev->bus->parent;
992 dbg("Could not find %s in acpi namespace, trying parent\n",
995 /* Parent must be a host bridge */
996 handle = acpi_get_pci_rootbridge_handle(
997 pci_domain_nr(parent),
1000 handle = DEVICE_ACPI_HANDLE(
1001 &(parent->self->dev));
1002 pdev = parent->self;
1006 acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
1007 dbg("Trying to get hotplug control for %s \n",
1008 (char *)string.pointer);
1009 status = pci_osc_control_set(handle,
1010 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL |
1011 OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
1012 if (status == AE_NOT_FOUND)
1013 status = acpi_run_oshp(handle);
1014 if (ACPI_SUCCESS(status)) {
1015 dbg("Gained control for hotplug HW for pci %s (%s)\n",
1016 pci_name(dev), (char *)string.pointer);
1017 kfree(string.pointer);
1020 if (acpi_root_bridge(handle))
1023 status = acpi_get_parent(chandle, &handle);
1024 if (ACPI_FAILURE(status))
1028 err("Cannot get control of hotplug hardware for pci %s\n",
1031 kfree(string.pointer);
1036 static int pcie_init_hardware_part1(struct controller *ctrl,
1037 struct pcie_device *dev)
1044 rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap);
1046 err("%s: Cannot read SLOTCAP register\n", __func__);
1050 /* Mask Hot-plug Interrupt Enable */
1051 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
1053 err("%s: Cannot read SLOTCTRL register\n", __func__);
1057 dbg("%s: SLOTCTRL %x value read %x\n",
1058 __func__, ctrl->cap_base + SLOTCTRL, temp_word);
1059 temp_word = (temp_word & ~HP_INTR_ENABLE & ~CMD_CMPL_INTR_ENABLE) |
1062 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
1064 err("%s: Cannot write to SLOTCTRL register\n", __func__);
1068 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
1070 err("%s: Cannot read SLOTSTATUS register\n", __func__);
1074 temp_word = 0x1F; /* Clear all events */
1075 rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word);
1077 err("%s: Cannot write to SLOTSTATUS register\n", __func__);
1083 int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
1087 u16 intr_enable = 0;
1091 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
1093 err("%s: Cannot read SLOTCTRL register\n", __func__);
1097 intr_enable = intr_enable | PRSN_DETECT_ENABLE;
1099 rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap);
1101 err("%s: Cannot read SLOTCAP register\n", __func__);
1105 if (ATTN_BUTTN(slot_cap))
1106 intr_enable = intr_enable | ATTN_BUTTN_ENABLE;
1108 if (POWER_CTRL(slot_cap))
1109 intr_enable = intr_enable | PWR_FAULT_DETECT_ENABLE;
1111 if (MRL_SENS(slot_cap))
1112 intr_enable = intr_enable | MRL_DETECT_ENABLE;
1114 temp_word = (temp_word & ~intr_enable) | intr_enable;
1116 if (pciehp_poll_mode) {
1117 temp_word = (temp_word & ~HP_INTR_ENABLE) | 0x0;
1119 temp_word = (temp_word & ~HP_INTR_ENABLE) | HP_INTR_ENABLE;
1123 * Unmask Hot-plug Interrupt Enable for the interrupt
1124 * notification mechanism case.
1126 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
1128 err("%s: Cannot write to SLOTCTRL register\n", __func__);
1131 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
1133 err("%s: Cannot read SLOTSTATUS register\n", __func__);
1134 goto abort_disable_intr;
1137 temp_word = 0x1F; /* Clear all events */
1138 rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word);
1140 err("%s: Cannot write to SLOTSTATUS register\n", __func__);
1141 goto abort_disable_intr;
1145 dbg("Bypassing BIOS check for pciehp use on %s\n",
1146 pci_name(ctrl->pci_dev));
1148 rc = pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev);
1150 goto abort_disable_intr;
1155 /* We end up here for the many possible ways to fail this API. */
1157 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
1159 temp_word &= ~(intr_enable | HP_INTR_ENABLE);
1160 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
1163 err("%s : disabling interrupts failed\n", __func__);
1168 int pcie_init(struct controller *ctrl, struct pcie_device *dev)
1174 u16 slot_status, slot_ctrl;
1175 struct pci_dev *pdev;
1178 ctrl->pci_dev = pdev; /* save pci_dev in context */
1180 dbg("%s: hotplug controller vendor id 0x%x device id 0x%x\n",
1181 __func__, pdev->vendor, pdev->device);
1183 cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1184 if (cap_base == 0) {
1185 dbg("%s: Can't find PCI_CAP_ID_EXP (0x10)\n", __func__);
1189 ctrl->cap_base = cap_base;
1191 dbg("%s: pcie_cap_base %x\n", __func__, cap_base);
1193 rc = pciehp_readw(ctrl, CAPREG, &cap_reg);
1195 err("%s: Cannot read CAPREG register\n", __func__);
1198 dbg("%s: CAPREG offset %x cap_reg %x\n",
1199 __func__, ctrl->cap_base + CAPREG, cap_reg);
1201 if (((cap_reg & SLOT_IMPL) == 0) ||
1202 (((cap_reg & DEV_PORT_TYPE) != 0x0040)
1203 && ((cap_reg & DEV_PORT_TYPE) != 0x0060))) {
1204 dbg("%s : This is not a root port or the port is not "
1205 "connected to a slot\n", __func__);
1209 rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap);
1211 err("%s: Cannot read SLOTCAP register\n", __func__);
1214 dbg("%s: SLOTCAP offset %x slot_cap %x\n",
1215 __func__, ctrl->cap_base + SLOTCAP, slot_cap);
1217 if (!(slot_cap & HP_CAP)) {
1218 dbg("%s : This slot is not hot-plug capable\n", __func__);
1221 /* For debugging purpose */
1222 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
1224 err("%s: Cannot read SLOTSTATUS register\n", __func__);
1227 dbg("%s: SLOTSTATUS offset %x slot_status %x\n",
1228 __func__, ctrl->cap_base + SLOTSTATUS, slot_status);
1230 rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
1232 err("%s: Cannot read SLOTCTRL register\n", __func__);
1235 dbg("%s: SLOTCTRL offset %x slot_ctrl %x\n",
1236 __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
1238 for (rc = 0; rc < DEVICE_COUNT_RESOURCE; rc++)
1239 if (pci_resource_len(pdev, rc) > 0)
1240 dbg("pci resource[%d] start=0x%llx(len=0x%llx)\n", rc,
1241 (unsigned long long)pci_resource_start(pdev, rc),
1242 (unsigned long long)pci_resource_len(pdev, rc));
1244 info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
1245 pdev->vendor, pdev->device,
1246 pdev->subsystem_vendor, pdev->subsystem_device);
1248 mutex_init(&ctrl->crit_sect);
1249 mutex_init(&ctrl->ctrl_lock);
1251 /* setup wait queue */
1252 init_waitqueue_head(&ctrl->queue);
1254 /* return PCI Controller Info */
1255 ctrl->slot_device_offset = 0;
1256 ctrl->num_slots = 1;
1257 ctrl->first_slot = slot_cap >> 19;
1258 ctrl->ctrlcap = slot_cap & 0x0000007f;
1260 rc = pcie_init_hardware_part1(ctrl, dev);
1264 if (pciehp_poll_mode) {
1265 /* Install interrupt polling timer. Start with 10 sec delay */
1266 init_timer(&ctrl->poll_timer);
1267 start_int_poll_timer(ctrl, 10);
1269 /* Installs the interrupt handler */
1270 rc = request_irq(ctrl->pci_dev->irq, pcie_isr, IRQF_SHARED,
1271 MY_NAME, (void *)ctrl);
1272 dbg("%s: request_irq %d for hpc%d (returns %d)\n",
1273 __func__, ctrl->pci_dev->irq,
1274 atomic_read(&pciehp_num_controllers), rc);
1276 err("Can't get irq %d for the hotplug controller\n",
1277 ctrl->pci_dev->irq);
1281 dbg("pciehp ctrl b:d:f:irq=0x%x:%x:%x:%x\n", pdev->bus->number,
1282 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), dev->irq);
1285 * If this is the first controller to be initialized,
1286 * initialize the pciehp work queue
1288 if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
1289 pciehp_wq = create_singlethread_workqueue("pciehpd");
1292 goto abort_free_irq;
1296 rc = pcie_init_hardware_part2(ctrl, dev);
1298 ctrl->hpc_ops = &pciehp_hpc_ops;
1302 if (pciehp_poll_mode)
1303 del_timer_sync(&ctrl->poll_timer);
1305 free_irq(ctrl->pci_dev->irq, ctrl);