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 pciehp_request_irq(struct controller *ctrl)
226 int retval, irq = ctrl->pci_dev->irq;
228 /* Install interrupt polling timer. Start with 10 sec delay */
229 if (pciehp_poll_mode) {
230 init_timer(&ctrl->poll_timer);
231 start_int_poll_timer(ctrl, 10);
235 /* Installs the interrupt handler */
236 retval = request_irq(irq, pcie_isr, IRQF_SHARED, MY_NAME, ctrl);
238 err("Cannot get irq %d for the hotplug controller\n", irq);
242 static inline void pciehp_free_irq(struct controller *ctrl)
244 if (pciehp_poll_mode)
245 del_timer_sync(&ctrl->poll_timer);
247 free_irq(ctrl->pci_dev->irq, ctrl);
250 static inline int pcie_wait_cmd(struct controller *ctrl)
253 unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
254 unsigned long timeout = msecs_to_jiffies(msecs);
257 rc = wait_event_interruptible_timeout(ctrl->queue,
258 !ctrl->cmd_busy, timeout);
260 dbg("Command not completed in 1000 msec\n");
263 info("Command was interrupted by a signal\n");
270 * pcie_write_cmd - Issue controller command
271 * @ctrl: controller to which the command is issued
272 * @cmd: command value written to slot control register
273 * @mask: bitmask of slot control register to be modified
275 static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
281 mutex_lock(&ctrl->ctrl_lock);
283 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
285 err("%s: Cannot read SLOTSTATUS register\n", __func__);
289 if ((slot_status & CMD_COMPLETED) == CMD_COMPLETED ) {
290 /* After 1 sec and CMD_COMPLETED still not set, just
291 proceed forward to issue the next command according
292 to spec. Just print out the error message */
293 dbg("%s: CMD_COMPLETED not clear after 1 sec.\n",
297 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
299 err("%s: Cannot read SLOTCTRL register\n", __func__);
304 slot_ctrl |= (cmd & mask);
305 /* Don't enable command completed if caller is changing it. */
306 if (!(mask & CMD_CMPL_INTR_ENABLE))
307 slot_ctrl |= CMD_CMPL_INTR_ENABLE;
311 retval = pciehp_writew(ctrl, SLOTCTRL, slot_ctrl);
313 err("%s: Cannot write to SLOTCTRL register\n", __func__);
316 * Wait for command completion.
319 retval = pcie_wait_cmd(ctrl);
321 mutex_unlock(&ctrl->ctrl_lock);
325 static int hpc_check_lnk_status(struct controller *ctrl)
330 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
332 err("%s: Cannot read LNKSTATUS register\n", __func__);
336 dbg("%s: lnk_status = %x\n", __func__, lnk_status);
337 if ( (lnk_status & LNK_TRN) || (lnk_status & LNK_TRN_ERR) ||
338 !(lnk_status & NEG_LINK_WD)) {
339 err("%s : Link Training Error occurs \n", __func__);
347 static int hpc_get_attention_status(struct slot *slot, u8 *status)
349 struct controller *ctrl = slot->ctrl;
354 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
356 err("%s: Cannot read SLOTCTRL register\n", __func__);
360 dbg("%s: SLOTCTRL %x, value read %x\n",
361 __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
363 atten_led_state = (slot_ctrl & ATTN_LED_CTRL) >> 6;
365 switch (atten_led_state) {
367 *status = 0xFF; /* Reserved */
370 *status = 1; /* On */
373 *status = 2; /* Blink */
376 *status = 0; /* Off */
386 static int hpc_get_power_status(struct slot *slot, u8 *status)
388 struct controller *ctrl = slot->ctrl;
393 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
395 err("%s: Cannot read SLOTCTRL register\n", __func__);
398 dbg("%s: SLOTCTRL %x value read %x\n",
399 __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
401 pwr_state = (slot_ctrl & PWR_CTRL) >> 10;
418 static int hpc_get_latch_status(struct slot *slot, u8 *status)
420 struct controller *ctrl = slot->ctrl;
424 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
426 err("%s: Cannot read SLOTSTATUS register\n", __func__);
430 *status = (((slot_status & MRL_STATE) >> 5) == 0) ? 0 : 1;
435 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
437 struct controller *ctrl = slot->ctrl;
442 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
444 err("%s: Cannot read SLOTSTATUS register\n", __func__);
447 card_state = (u8)((slot_status & PRSN_STATE) >> 6);
448 *status = (card_state == 1) ? 1 : 0;
453 static int hpc_query_power_fault(struct slot *slot)
455 struct controller *ctrl = slot->ctrl;
460 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
462 err("%s: Cannot check for power fault\n", __func__);
465 pwr_fault = (u8)((slot_status & PWR_FAULT_DETECTED) >> 1);
470 static int hpc_get_emi_status(struct slot *slot, u8 *status)
472 struct controller *ctrl = slot->ctrl;
476 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
478 err("%s : Cannot check EMI status\n", __func__);
481 *status = (slot_status & EMI_STATE) >> EMI_STATUS_BIT;
486 static int hpc_toggle_emi(struct slot *slot)
494 rc = pcie_write_cmd(slot->ctrl, slot_cmd, cmd_mask);
495 slot->last_emi_toggle = get_seconds();
500 static int hpc_set_attention_status(struct slot *slot, u8 value)
502 struct controller *ctrl = slot->ctrl;
507 cmd_mask = ATTN_LED_CTRL;
509 case 0 : /* turn off */
512 case 1: /* turn on */
515 case 2: /* turn blink */
521 rc = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
522 dbg("%s: SLOTCTRL %x write cmd %x\n",
523 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
528 static void hpc_set_green_led_on(struct slot *slot)
530 struct controller *ctrl = slot->ctrl;
535 cmd_mask = PWR_LED_CTRL;
536 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
537 dbg("%s: SLOTCTRL %x write cmd %x\n",
538 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
541 static void hpc_set_green_led_off(struct slot *slot)
543 struct controller *ctrl = slot->ctrl;
548 cmd_mask = PWR_LED_CTRL;
549 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
550 dbg("%s: SLOTCTRL %x write cmd %x\n",
551 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
554 static void hpc_set_green_led_blink(struct slot *slot)
556 struct controller *ctrl = slot->ctrl;
561 cmd_mask = PWR_LED_CTRL;
562 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
563 dbg("%s: SLOTCTRL %x write cmd %x\n",
564 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
567 static void hpc_release_ctlr(struct controller *ctrl)
569 /* Mask Hot-plug Interrupt Enable */
570 if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE))
571 err("%s: Cannot mask hotplut interrupt enable\n", __func__);
573 /* Free interrupt handler or interrupt polling timer */
574 pciehp_free_irq(ctrl);
577 * If this is the last controller to be released, destroy the
580 if (atomic_dec_and_test(&pciehp_num_controllers))
581 destroy_workqueue(pciehp_wq);
584 static int hpc_power_on_slot(struct slot * slot)
586 struct controller *ctrl = slot->ctrl;
592 dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
594 /* Clear sticky power-fault bit from previous power failures */
595 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
597 err("%s: Cannot read SLOTSTATUS register\n", __func__);
600 slot_status &= PWR_FAULT_DETECTED;
602 retval = pciehp_writew(ctrl, SLOTSTATUS, slot_status);
604 err("%s: Cannot write to SLOTSTATUS register\n",
612 /* Enable detection that we turned off at slot power-off time */
613 if (!pciehp_poll_mode) {
614 slot_cmd |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
616 cmd_mask |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
620 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
623 err("%s: Write %x command failed!\n", __func__, slot_cmd);
626 dbg("%s: SLOTCTRL %x write cmd %x\n",
627 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
632 static inline int pcie_mask_bad_dllp(struct controller *ctrl)
634 struct pci_dev *dev = ctrl->pci_dev;
638 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
641 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
642 if (reg & PCI_ERR_COR_BAD_DLLP)
644 reg |= PCI_ERR_COR_BAD_DLLP;
645 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
649 static inline void pcie_unmask_bad_dllp(struct controller *ctrl)
651 struct pci_dev *dev = ctrl->pci_dev;
655 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
658 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
659 if (!(reg & PCI_ERR_COR_BAD_DLLP))
661 reg &= ~PCI_ERR_COR_BAD_DLLP;
662 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
665 static int hpc_power_off_slot(struct slot * slot)
667 struct controller *ctrl = slot->ctrl;
673 dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
676 * Set Bad DLLP Mask bit in Correctable Error Mask
677 * Register. This is the workaround against Bad DLLP error
678 * that sometimes happens during turning power off the slot
679 * which conforms to PCI Express 1.0a spec.
681 changed = pcie_mask_bad_dllp(ctrl);
683 slot_cmd = POWER_OFF;
686 * If we get MRL or presence detect interrupts now, the isr
687 * will notice the sticky power-fault bit too and issue power
688 * indicator change commands. This will lead to an endless loop
689 * of command completions, since the power-fault bit remains on
690 * till the slot is powered on again.
692 if (!pciehp_poll_mode) {
693 slot_cmd &= ~(PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
695 cmd_mask |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
699 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
701 err("%s: Write command failed!\n", __func__);
705 dbg("%s: SLOTCTRL %x write cmd %x\n",
706 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
709 * After turning power off, we must wait for at least 1 second
710 * before taking any action that relies on power having been
711 * removed from the slot/adapter.
716 pcie_unmask_bad_dllp(ctrl);
721 static irqreturn_t pcie_isr(int irq, void *dev_id)
723 struct controller *ctrl = (struct controller *)dev_id;
724 u16 detected, intr_loc;
727 * In order to guarantee that all interrupt events are
728 * serviced, we need to re-inspect Slot Status register after
729 * clearing what is presumed to be the last pending interrupt.
733 if (pciehp_readw(ctrl, SLOTSTATUS, &detected)) {
734 err("%s: Cannot read SLOTSTATUS\n", __func__);
738 detected &= (ATTN_BUTTN_PRESSED | PWR_FAULT_DETECTED |
739 MRL_SENS_CHANGED | PRSN_DETECT_CHANGED |
741 intr_loc |= detected;
744 if (pciehp_writew(ctrl, SLOTSTATUS, detected)) {
745 err("%s: Cannot write to SLOTSTATUS\n", __func__);
750 dbg("%s: intr_loc %x\n", __FUNCTION__, intr_loc);
752 /* Check Command Complete Interrupt Pending */
753 if (intr_loc & CMD_COMPLETED) {
756 wake_up_interruptible(&ctrl->queue);
759 /* Check MRL Sensor Changed */
760 if (intr_loc & MRL_SENS_CHANGED)
761 pciehp_handle_switch_change(0, ctrl);
763 /* Check Attention Button Pressed */
764 if (intr_loc & ATTN_BUTTN_PRESSED)
765 pciehp_handle_attention_button(0, ctrl);
767 /* Check Presence Detect Changed */
768 if (intr_loc & PRSN_DETECT_CHANGED)
769 pciehp_handle_presence_change(0, ctrl);
771 /* Check Power Fault Detected */
772 if (intr_loc & PWR_FAULT_DETECTED)
773 pciehp_handle_power_fault(0, ctrl);
778 static int hpc_get_max_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
780 struct controller *ctrl = slot->ctrl;
781 enum pcie_link_speed lnk_speed;
785 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
787 err("%s: Cannot read LNKCAP register\n", __func__);
791 switch (lnk_cap & 0x000F) {
793 lnk_speed = PCIE_2PT5GB;
796 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
801 dbg("Max link speed = %d\n", lnk_speed);
806 static int hpc_get_max_lnk_width(struct slot *slot,
807 enum pcie_link_width *value)
809 struct controller *ctrl = slot->ctrl;
810 enum pcie_link_width lnk_wdth;
814 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
816 err("%s: Cannot read LNKCAP register\n", __func__);
820 switch ((lnk_cap & 0x03F0) >> 4){
822 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
825 lnk_wdth = PCIE_LNK_X1;
828 lnk_wdth = PCIE_LNK_X2;
831 lnk_wdth = PCIE_LNK_X4;
834 lnk_wdth = PCIE_LNK_X8;
837 lnk_wdth = PCIE_LNK_X12;
840 lnk_wdth = PCIE_LNK_X16;
843 lnk_wdth = PCIE_LNK_X32;
846 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
851 dbg("Max link width = %d\n", lnk_wdth);
856 static int hpc_get_cur_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
858 struct controller *ctrl = slot->ctrl;
859 enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
863 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
865 err("%s: Cannot read LNKSTATUS register\n", __func__);
869 switch (lnk_status & 0x0F) {
871 lnk_speed = PCIE_2PT5GB;
874 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
879 dbg("Current link speed = %d\n", lnk_speed);
884 static int hpc_get_cur_lnk_width(struct slot *slot,
885 enum pcie_link_width *value)
887 struct controller *ctrl = slot->ctrl;
888 enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
892 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
894 err("%s: Cannot read LNKSTATUS register\n", __func__);
898 switch ((lnk_status & 0x03F0) >> 4){
900 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
903 lnk_wdth = PCIE_LNK_X1;
906 lnk_wdth = PCIE_LNK_X2;
909 lnk_wdth = PCIE_LNK_X4;
912 lnk_wdth = PCIE_LNK_X8;
915 lnk_wdth = PCIE_LNK_X12;
918 lnk_wdth = PCIE_LNK_X16;
921 lnk_wdth = PCIE_LNK_X32;
924 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
929 dbg("Current link width = %d\n", lnk_wdth);
934 static struct hpc_ops pciehp_hpc_ops = {
935 .power_on_slot = hpc_power_on_slot,
936 .power_off_slot = hpc_power_off_slot,
937 .set_attention_status = hpc_set_attention_status,
938 .get_power_status = hpc_get_power_status,
939 .get_attention_status = hpc_get_attention_status,
940 .get_latch_status = hpc_get_latch_status,
941 .get_adapter_status = hpc_get_adapter_status,
942 .get_emi_status = hpc_get_emi_status,
943 .toggle_emi = hpc_toggle_emi,
945 .get_max_bus_speed = hpc_get_max_lnk_speed,
946 .get_cur_bus_speed = hpc_get_cur_lnk_speed,
947 .get_max_lnk_width = hpc_get_max_lnk_width,
948 .get_cur_lnk_width = hpc_get_cur_lnk_width,
950 .query_power_fault = hpc_query_power_fault,
951 .green_led_on = hpc_set_green_led_on,
952 .green_led_off = hpc_set_green_led_off,
953 .green_led_blink = hpc_set_green_led_blink,
955 .release_ctlr = hpc_release_ctlr,
956 .check_lnk_status = hpc_check_lnk_status,
960 static int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
963 acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
964 struct pci_dev *pdev = dev;
965 struct pci_bus *parent;
966 struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
969 * Per PCI firmware specification, we should run the ACPI _OSC
970 * method to get control of hotplug hardware before using it.
971 * If an _OSC is missing, we look for an OSHP to do the same thing.
972 * To handle different BIOS behavior, we look for _OSC and OSHP
973 * within the scope of the hotplug controller and its parents, upto
974 * the host bridge under which this controller exists.
978 * This hotplug controller was not listed in the ACPI name
979 * space at all. Try to get acpi handle of parent pci bus.
981 if (!pdev || !pdev->bus->parent)
983 parent = pdev->bus->parent;
984 dbg("Could not find %s in acpi namespace, trying parent\n",
987 /* Parent must be a host bridge */
988 handle = acpi_get_pci_rootbridge_handle(
989 pci_domain_nr(parent),
992 handle = DEVICE_ACPI_HANDLE(
993 &(parent->self->dev));
998 acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
999 dbg("Trying to get hotplug control for %s \n",
1000 (char *)string.pointer);
1001 status = pci_osc_control_set(handle,
1002 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL |
1003 OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
1004 if (status == AE_NOT_FOUND)
1005 status = acpi_run_oshp(handle);
1006 if (ACPI_SUCCESS(status)) {
1007 dbg("Gained control for hotplug HW for pci %s (%s)\n",
1008 pci_name(dev), (char *)string.pointer);
1009 kfree(string.pointer);
1012 if (acpi_root_bridge(handle))
1015 status = acpi_get_parent(chandle, &handle);
1016 if (ACPI_FAILURE(status))
1020 dbg("Cannot get control of hotplug hardware for pci %s\n",
1023 kfree(string.pointer);
1028 static int pcie_init_hardware_part1(struct controller *ctrl,
1029 struct pcie_device *dev)
1031 /* Mask Hot-plug Interrupt Enable */
1032 if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE)) {
1033 err("%s: Cannot mask hotplug interrupt enable\n", __func__);
1039 int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
1044 * We need to clear all events before enabling hotplug interrupt
1045 * notification mechanism in order for hotplug controler to
1046 * generate interrupts.
1048 if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
1049 err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__);
1053 cmd = PRSN_DETECT_ENABLE;
1054 if (ATTN_BUTTN(ctrl))
1055 cmd |= ATTN_BUTTN_ENABLE;
1056 if (POWER_CTRL(ctrl))
1057 cmd |= PWR_FAULT_DETECT_ENABLE;
1059 cmd |= MRL_DETECT_ENABLE;
1060 if (!pciehp_poll_mode)
1061 cmd |= HP_INTR_ENABLE;
1063 mask = PRSN_DETECT_ENABLE | ATTN_BUTTN_ENABLE |
1064 PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE | HP_INTR_ENABLE;
1066 if (pcie_write_cmd(ctrl, cmd, mask)) {
1067 err("%s: Cannot enable software notification\n", __func__);
1072 dbg("Bypassing BIOS check for pciehp use on %s\n",
1073 pci_name(ctrl->pci_dev));
1074 else if (pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev))
1075 goto abort_disable_intr;
1079 /* We end up here for the many possible ways to fail this API. */
1081 if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE))
1082 err("%s : disabling interrupts failed\n", __func__);
1087 static inline void dbg_ctrl(struct controller *ctrl)
1091 struct pci_dev *pdev = ctrl->pci_dev;
1096 dbg("Hotplug Controller:\n");
1097 dbg(" Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n", pci_name(pdev), pdev->irq);
1098 dbg(" Vendor ID : 0x%04x\n", pdev->vendor);
1099 dbg(" Device ID : 0x%04x\n", pdev->device);
1100 dbg(" Subsystem ID : 0x%04x\n", pdev->subsystem_device);
1101 dbg(" Subsystem Vendor ID : 0x%04x\n", pdev->subsystem_vendor);
1102 dbg(" PCIe Cap offset : 0x%02x\n", ctrl->cap_base);
1103 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1104 if (!pci_resource_len(pdev, i))
1106 dbg(" PCI resource [%d] : 0x%llx@0x%llx\n", i,
1107 (unsigned long long)pci_resource_len(pdev, i),
1108 (unsigned long long)pci_resource_start(pdev, i));
1110 dbg("Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
1111 dbg(" Physical Slot Number : %d\n", ctrl->first_slot);
1112 dbg(" Attention Button : %3s\n", ATTN_BUTTN(ctrl) ? "yes" : "no");
1113 dbg(" Power Controller : %3s\n", POWER_CTRL(ctrl) ? "yes" : "no");
1114 dbg(" MRL Sensor : %3s\n", MRL_SENS(ctrl) ? "yes" : "no");
1115 dbg(" Attention Indicator : %3s\n", ATTN_LED(ctrl) ? "yes" : "no");
1116 dbg(" Power Indicator : %3s\n", PWR_LED(ctrl) ? "yes" : "no");
1117 dbg(" Hot-Plug Surprise : %3s\n", HP_SUPR_RM(ctrl) ? "yes" : "no");
1118 dbg(" EMI Present : %3s\n", EMI(ctrl) ? "yes" : "no");
1119 pciehp_readw(ctrl, SLOTSTATUS, ®16);
1120 dbg("Slot Status : 0x%04x\n", reg16);
1121 pciehp_readw(ctrl, SLOTSTATUS, ®16);
1122 dbg("Slot Control : 0x%04x\n", reg16);
1125 int pcie_init(struct controller *ctrl, struct pcie_device *dev)
1128 struct pci_dev *pdev = dev->port;
1130 ctrl->pci_dev = pdev;
1131 ctrl->cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1132 if (!ctrl->cap_base) {
1133 err("%s: Cannot find PCI Express capability\n", __func__);
1136 if (pciehp_readl(ctrl, SLOTCAP, &slot_cap)) {
1137 err("%s: Cannot read SLOTCAP register\n", __func__);
1141 ctrl->slot_cap = slot_cap;
1142 ctrl->first_slot = slot_cap >> 19;
1143 ctrl->slot_device_offset = 0;
1144 ctrl->num_slots = 1;
1145 ctrl->hpc_ops = &pciehp_hpc_ops;
1146 mutex_init(&ctrl->crit_sect);
1147 mutex_init(&ctrl->ctrl_lock);
1148 init_waitqueue_head(&ctrl->queue);
1151 info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
1152 pdev->vendor, pdev->device,
1153 pdev->subsystem_vendor, pdev->subsystem_device);
1155 if (pcie_init_hardware_part1(ctrl, dev))
1158 if (pciehp_request_irq(ctrl))
1162 * If this is the first controller to be initialized,
1163 * initialize the pciehp work queue
1165 if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
1166 pciehp_wq = create_singlethread_workqueue("pciehpd");
1168 goto abort_free_irq;
1172 if (pcie_init_hardware_part2(ctrl, dev))
1173 goto abort_free_irq;
1178 pciehp_free_irq(ctrl);