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) {
290 if (!ctrl->no_cmd_complete) {
292 * After 1 sec and CMD_COMPLETED still not set, just
293 * proceed forward to issue the next command according
294 * to spec. Just print out the error message.
296 dbg("%s: CMD_COMPLETED not clear after 1 sec.\n",
298 } else if (!NO_CMD_CMPL(ctrl)) {
300 * This controller semms to notify of command completed
301 * event even though it supports none of power
302 * controller, attention led, power led and EMI.
304 dbg("%s: Unexpected CMD_COMPLETED. Need to wait for "
305 "command completed event.\n", __func__);
306 ctrl->no_cmd_complete = 0;
308 dbg("%s: Unexpected CMD_COMPLETED. Maybe the "
309 "controller is broken.\n", __func__);
313 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
315 err("%s: Cannot read SLOTCTRL register\n", __func__);
320 slot_ctrl |= (cmd & mask);
321 /* Don't enable command completed if caller is changing it. */
322 if (!(mask & CMD_CMPL_INTR_ENABLE))
323 slot_ctrl |= CMD_CMPL_INTR_ENABLE;
327 retval = pciehp_writew(ctrl, SLOTCTRL, slot_ctrl);
329 err("%s: Cannot write to SLOTCTRL register\n", __func__);
332 * Wait for command completion.
334 if (!retval && !ctrl->no_cmd_complete)
335 retval = pcie_wait_cmd(ctrl);
337 mutex_unlock(&ctrl->ctrl_lock);
341 static int hpc_check_lnk_status(struct controller *ctrl)
346 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
348 err("%s: Cannot read LNKSTATUS register\n", __func__);
352 dbg("%s: lnk_status = %x\n", __func__, lnk_status);
353 if ( (lnk_status & LNK_TRN) || (lnk_status & LNK_TRN_ERR) ||
354 !(lnk_status & NEG_LINK_WD)) {
355 err("%s : Link Training Error occurs \n", __func__);
363 static int hpc_get_attention_status(struct slot *slot, u8 *status)
365 struct controller *ctrl = slot->ctrl;
370 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
372 err("%s: Cannot read SLOTCTRL register\n", __func__);
376 dbg("%s: SLOTCTRL %x, value read %x\n",
377 __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
379 atten_led_state = (slot_ctrl & ATTN_LED_CTRL) >> 6;
381 switch (atten_led_state) {
383 *status = 0xFF; /* Reserved */
386 *status = 1; /* On */
389 *status = 2; /* Blink */
392 *status = 0; /* Off */
402 static int hpc_get_power_status(struct slot *slot, u8 *status)
404 struct controller *ctrl = slot->ctrl;
409 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
411 err("%s: Cannot read SLOTCTRL register\n", __func__);
414 dbg("%s: SLOTCTRL %x value read %x\n",
415 __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
417 pwr_state = (slot_ctrl & PWR_CTRL) >> 10;
434 static int hpc_get_latch_status(struct slot *slot, u8 *status)
436 struct controller *ctrl = slot->ctrl;
440 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
442 err("%s: Cannot read SLOTSTATUS register\n", __func__);
446 *status = (((slot_status & MRL_STATE) >> 5) == 0) ? 0 : 1;
451 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
453 struct controller *ctrl = slot->ctrl;
458 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
460 err("%s: Cannot read SLOTSTATUS register\n", __func__);
463 card_state = (u8)((slot_status & PRSN_STATE) >> 6);
464 *status = (card_state == 1) ? 1 : 0;
469 static int hpc_query_power_fault(struct slot *slot)
471 struct controller *ctrl = slot->ctrl;
476 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
478 err("%s: Cannot check for power fault\n", __func__);
481 pwr_fault = (u8)((slot_status & PWR_FAULT_DETECTED) >> 1);
486 static int hpc_get_emi_status(struct slot *slot, u8 *status)
488 struct controller *ctrl = slot->ctrl;
492 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
494 err("%s : Cannot check EMI status\n", __func__);
497 *status = (slot_status & EMI_STATE) >> EMI_STATUS_BIT;
502 static int hpc_toggle_emi(struct slot *slot)
510 rc = pcie_write_cmd(slot->ctrl, slot_cmd, cmd_mask);
511 slot->last_emi_toggle = get_seconds();
516 static int hpc_set_attention_status(struct slot *slot, u8 value)
518 struct controller *ctrl = slot->ctrl;
523 cmd_mask = ATTN_LED_CTRL;
525 case 0 : /* turn off */
528 case 1: /* turn on */
531 case 2: /* turn blink */
537 rc = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
538 dbg("%s: SLOTCTRL %x write cmd %x\n",
539 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
544 static void hpc_set_green_led_on(struct slot *slot)
546 struct controller *ctrl = slot->ctrl;
551 cmd_mask = PWR_LED_CTRL;
552 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
553 dbg("%s: SLOTCTRL %x write cmd %x\n",
554 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
557 static void hpc_set_green_led_off(struct slot *slot)
559 struct controller *ctrl = slot->ctrl;
564 cmd_mask = PWR_LED_CTRL;
565 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
566 dbg("%s: SLOTCTRL %x write cmd %x\n",
567 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
570 static void hpc_set_green_led_blink(struct slot *slot)
572 struct controller *ctrl = slot->ctrl;
577 cmd_mask = PWR_LED_CTRL;
578 pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
579 dbg("%s: SLOTCTRL %x write cmd %x\n",
580 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
583 static void hpc_release_ctlr(struct controller *ctrl)
585 /* Mask Hot-plug Interrupt Enable */
586 if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE))
587 err("%s: Cannot mask hotplut interrupt enable\n", __func__);
589 /* Free interrupt handler or interrupt polling timer */
590 pciehp_free_irq(ctrl);
593 * If this is the last controller to be released, destroy the
596 if (atomic_dec_and_test(&pciehp_num_controllers))
597 destroy_workqueue(pciehp_wq);
600 static int hpc_power_on_slot(struct slot * slot)
602 struct controller *ctrl = slot->ctrl;
608 dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
610 /* Clear sticky power-fault bit from previous power failures */
611 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
613 err("%s: Cannot read SLOTSTATUS register\n", __func__);
616 slot_status &= PWR_FAULT_DETECTED;
618 retval = pciehp_writew(ctrl, SLOTSTATUS, slot_status);
620 err("%s: Cannot write to SLOTSTATUS register\n",
628 /* Enable detection that we turned off at slot power-off time */
629 if (!pciehp_poll_mode) {
630 slot_cmd |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
632 cmd_mask |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
636 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
639 err("%s: Write %x command failed!\n", __func__, slot_cmd);
642 dbg("%s: SLOTCTRL %x write cmd %x\n",
643 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
648 static inline int pcie_mask_bad_dllp(struct controller *ctrl)
650 struct pci_dev *dev = ctrl->pci_dev;
654 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
657 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
658 if (reg & PCI_ERR_COR_BAD_DLLP)
660 reg |= PCI_ERR_COR_BAD_DLLP;
661 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
665 static inline void pcie_unmask_bad_dllp(struct controller *ctrl)
667 struct pci_dev *dev = ctrl->pci_dev;
671 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
674 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®);
675 if (!(reg & PCI_ERR_COR_BAD_DLLP))
677 reg &= ~PCI_ERR_COR_BAD_DLLP;
678 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
681 static int hpc_power_off_slot(struct slot * slot)
683 struct controller *ctrl = slot->ctrl;
689 dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
692 * Set Bad DLLP Mask bit in Correctable Error Mask
693 * Register. This is the workaround against Bad DLLP error
694 * that sometimes happens during turning power off the slot
695 * which conforms to PCI Express 1.0a spec.
697 changed = pcie_mask_bad_dllp(ctrl);
699 slot_cmd = POWER_OFF;
702 * If we get MRL or presence detect interrupts now, the isr
703 * will notice the sticky power-fault bit too and issue power
704 * indicator change commands. This will lead to an endless loop
705 * of command completions, since the power-fault bit remains on
706 * till the slot is powered on again.
708 if (!pciehp_poll_mode) {
709 slot_cmd &= ~(PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
711 cmd_mask |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
715 retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
717 err("%s: Write command failed!\n", __func__);
721 dbg("%s: SLOTCTRL %x write cmd %x\n",
722 __func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
725 * After turning power off, we must wait for at least 1 second
726 * before taking any action that relies on power having been
727 * removed from the slot/adapter.
732 pcie_unmask_bad_dllp(ctrl);
737 static irqreturn_t pcie_isr(int irq, void *dev_id)
739 struct controller *ctrl = (struct controller *)dev_id;
740 u16 detected, intr_loc;
744 * In order to guarantee that all interrupt events are
745 * serviced, we need to re-inspect Slot Status register after
746 * clearing what is presumed to be the last pending interrupt.
750 if (pciehp_readw(ctrl, SLOTSTATUS, &detected)) {
751 err("%s: Cannot read SLOTSTATUS\n", __func__);
755 detected &= (ATTN_BUTTN_PRESSED | PWR_FAULT_DETECTED |
756 MRL_SENS_CHANGED | PRSN_DETECT_CHANGED |
758 intr_loc |= detected;
761 if (pciehp_writew(ctrl, SLOTSTATUS, detected)) {
762 err("%s: Cannot write to SLOTSTATUS\n", __func__);
767 dbg("%s: intr_loc %x\n", __FUNCTION__, intr_loc);
769 /* Check Command Complete Interrupt Pending */
770 if (intr_loc & CMD_COMPLETED) {
773 wake_up_interruptible(&ctrl->queue);
776 if (!(intr_loc & ~CMD_COMPLETED))
780 * Return without handling events if this handler routine is
781 * called before controller initialization is done. This may
782 * happen if hotplug event or another interrupt that shares
783 * the IRQ with pciehp arrives before slot initialization is
784 * done after interrupt handler is registered.
786 * FIXME - Need more structural fixes. We need to be ready to
787 * handle the event before installing interrupt handler.
789 p_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
790 if (!p_slot || !p_slot->hpc_ops)
793 /* Check MRL Sensor Changed */
794 if (intr_loc & MRL_SENS_CHANGED)
795 pciehp_handle_switch_change(p_slot);
797 /* Check Attention Button Pressed */
798 if (intr_loc & ATTN_BUTTN_PRESSED)
799 pciehp_handle_attention_button(p_slot);
801 /* Check Presence Detect Changed */
802 if (intr_loc & PRSN_DETECT_CHANGED)
803 pciehp_handle_presence_change(p_slot);
805 /* Check Power Fault Detected */
806 if (intr_loc & PWR_FAULT_DETECTED)
807 pciehp_handle_power_fault(p_slot);
812 static int hpc_get_max_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
814 struct controller *ctrl = slot->ctrl;
815 enum pcie_link_speed lnk_speed;
819 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
821 err("%s: Cannot read LNKCAP register\n", __func__);
825 switch (lnk_cap & 0x000F) {
827 lnk_speed = PCIE_2PT5GB;
830 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
835 dbg("Max link speed = %d\n", lnk_speed);
840 static int hpc_get_max_lnk_width(struct slot *slot,
841 enum pcie_link_width *value)
843 struct controller *ctrl = slot->ctrl;
844 enum pcie_link_width lnk_wdth;
848 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
850 err("%s: Cannot read LNKCAP register\n", __func__);
854 switch ((lnk_cap & 0x03F0) >> 4){
856 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
859 lnk_wdth = PCIE_LNK_X1;
862 lnk_wdth = PCIE_LNK_X2;
865 lnk_wdth = PCIE_LNK_X4;
868 lnk_wdth = PCIE_LNK_X8;
871 lnk_wdth = PCIE_LNK_X12;
874 lnk_wdth = PCIE_LNK_X16;
877 lnk_wdth = PCIE_LNK_X32;
880 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
885 dbg("Max link width = %d\n", lnk_wdth);
890 static int hpc_get_cur_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
892 struct controller *ctrl = slot->ctrl;
893 enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
897 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
899 err("%s: Cannot read LNKSTATUS register\n", __func__);
903 switch (lnk_status & 0x0F) {
905 lnk_speed = PCIE_2PT5GB;
908 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
913 dbg("Current link speed = %d\n", lnk_speed);
918 static int hpc_get_cur_lnk_width(struct slot *slot,
919 enum pcie_link_width *value)
921 struct controller *ctrl = slot->ctrl;
922 enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
926 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
928 err("%s: Cannot read LNKSTATUS register\n", __func__);
932 switch ((lnk_status & 0x03F0) >> 4){
934 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
937 lnk_wdth = PCIE_LNK_X1;
940 lnk_wdth = PCIE_LNK_X2;
943 lnk_wdth = PCIE_LNK_X4;
946 lnk_wdth = PCIE_LNK_X8;
949 lnk_wdth = PCIE_LNK_X12;
952 lnk_wdth = PCIE_LNK_X16;
955 lnk_wdth = PCIE_LNK_X32;
958 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
963 dbg("Current link width = %d\n", lnk_wdth);
968 static struct hpc_ops pciehp_hpc_ops = {
969 .power_on_slot = hpc_power_on_slot,
970 .power_off_slot = hpc_power_off_slot,
971 .set_attention_status = hpc_set_attention_status,
972 .get_power_status = hpc_get_power_status,
973 .get_attention_status = hpc_get_attention_status,
974 .get_latch_status = hpc_get_latch_status,
975 .get_adapter_status = hpc_get_adapter_status,
976 .get_emi_status = hpc_get_emi_status,
977 .toggle_emi = hpc_toggle_emi,
979 .get_max_bus_speed = hpc_get_max_lnk_speed,
980 .get_cur_bus_speed = hpc_get_cur_lnk_speed,
981 .get_max_lnk_width = hpc_get_max_lnk_width,
982 .get_cur_lnk_width = hpc_get_cur_lnk_width,
984 .query_power_fault = hpc_query_power_fault,
985 .green_led_on = hpc_set_green_led_on,
986 .green_led_off = hpc_set_green_led_off,
987 .green_led_blink = hpc_set_green_led_blink,
989 .release_ctlr = hpc_release_ctlr,
990 .check_lnk_status = hpc_check_lnk_status,
994 static int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
997 acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
998 struct pci_dev *pdev = dev;
999 struct pci_bus *parent;
1000 struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
1003 * Per PCI firmware specification, we should run the ACPI _OSC
1004 * method to get control of hotplug hardware before using it.
1005 * If an _OSC is missing, we look for an OSHP to do the same thing.
1006 * To handle different BIOS behavior, we look for _OSC and OSHP
1007 * within the scope of the hotplug controller and its parents, upto
1008 * the host bridge under which this controller exists.
1012 * This hotplug controller was not listed in the ACPI name
1013 * space at all. Try to get acpi handle of parent pci bus.
1015 if (!pdev || !pdev->bus->parent)
1017 parent = pdev->bus->parent;
1018 dbg("Could not find %s in acpi namespace, trying parent\n",
1021 /* Parent must be a host bridge */
1022 handle = acpi_get_pci_rootbridge_handle(
1023 pci_domain_nr(parent),
1026 handle = DEVICE_ACPI_HANDLE(
1027 &(parent->self->dev));
1028 pdev = parent->self;
1032 acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
1033 dbg("Trying to get hotplug control for %s \n",
1034 (char *)string.pointer);
1035 status = pci_osc_control_set(handle,
1036 OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL |
1037 OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
1038 if (status == AE_NOT_FOUND)
1039 status = acpi_run_oshp(handle);
1040 if (ACPI_SUCCESS(status)) {
1041 dbg("Gained control for hotplug HW for pci %s (%s)\n",
1042 pci_name(dev), (char *)string.pointer);
1043 kfree(string.pointer);
1046 if (acpi_root_bridge(handle))
1049 status = acpi_get_parent(chandle, &handle);
1050 if (ACPI_FAILURE(status))
1054 dbg("Cannot get control of hotplug hardware for pci %s\n",
1057 kfree(string.pointer);
1062 static int pcie_init_hardware_part1(struct controller *ctrl,
1063 struct pcie_device *dev)
1065 /* Clear all remaining event bits in Slot Status register */
1066 if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
1067 err("%s: Cannot write to SLOTSTATUS register\n", __func__);
1071 /* Mask Hot-plug Interrupt Enable */
1072 if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE)) {
1073 err("%s: Cannot mask hotplug interrupt enable\n", __func__);
1079 int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
1083 cmd = PRSN_DETECT_ENABLE;
1084 if (ATTN_BUTTN(ctrl))
1085 cmd |= ATTN_BUTTN_ENABLE;
1086 if (POWER_CTRL(ctrl))
1087 cmd |= PWR_FAULT_DETECT_ENABLE;
1089 cmd |= MRL_DETECT_ENABLE;
1090 if (!pciehp_poll_mode)
1091 cmd |= HP_INTR_ENABLE;
1093 mask = PRSN_DETECT_ENABLE | ATTN_BUTTN_ENABLE |
1094 PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE | HP_INTR_ENABLE;
1096 if (pcie_write_cmd(ctrl, cmd, mask)) {
1097 err("%s: Cannot enable software notification\n", __func__);
1102 dbg("Bypassing BIOS check for pciehp use on %s\n",
1103 pci_name(ctrl->pci_dev));
1104 else if (pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev))
1105 goto abort_disable_intr;
1109 /* We end up here for the many possible ways to fail this API. */
1111 if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE))
1112 err("%s : disabling interrupts failed\n", __func__);
1117 static inline void dbg_ctrl(struct controller *ctrl)
1121 struct pci_dev *pdev = ctrl->pci_dev;
1126 dbg("Hotplug Controller:\n");
1127 dbg(" Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n", pci_name(pdev), pdev->irq);
1128 dbg(" Vendor ID : 0x%04x\n", pdev->vendor);
1129 dbg(" Device ID : 0x%04x\n", pdev->device);
1130 dbg(" Subsystem ID : 0x%04x\n", pdev->subsystem_device);
1131 dbg(" Subsystem Vendor ID : 0x%04x\n", pdev->subsystem_vendor);
1132 dbg(" PCIe Cap offset : 0x%02x\n", ctrl->cap_base);
1133 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
1134 if (!pci_resource_len(pdev, i))
1136 dbg(" PCI resource [%d] : 0x%llx@0x%llx\n", i,
1137 (unsigned long long)pci_resource_len(pdev, i),
1138 (unsigned long long)pci_resource_start(pdev, i));
1140 dbg("Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
1141 dbg(" Physical Slot Number : %d\n", ctrl->first_slot);
1142 dbg(" Attention Button : %3s\n", ATTN_BUTTN(ctrl) ? "yes" : "no");
1143 dbg(" Power Controller : %3s\n", POWER_CTRL(ctrl) ? "yes" : "no");
1144 dbg(" MRL Sensor : %3s\n", MRL_SENS(ctrl) ? "yes" : "no");
1145 dbg(" Attention Indicator : %3s\n", ATTN_LED(ctrl) ? "yes" : "no");
1146 dbg(" Power Indicator : %3s\n", PWR_LED(ctrl) ? "yes" : "no");
1147 dbg(" Hot-Plug Surprise : %3s\n", HP_SUPR_RM(ctrl) ? "yes" : "no");
1148 dbg(" EMI Present : %3s\n", EMI(ctrl) ? "yes" : "no");
1149 dbg(" Comamnd Completed : %3s\n", NO_CMD_CMPL(ctrl)? "no" : "yes");
1150 pciehp_readw(ctrl, SLOTSTATUS, ®16);
1151 dbg("Slot Status : 0x%04x\n", reg16);
1152 pciehp_readw(ctrl, SLOTSTATUS, ®16);
1153 dbg("Slot Control : 0x%04x\n", reg16);
1156 int pcie_init(struct controller *ctrl, struct pcie_device *dev)
1159 struct pci_dev *pdev = dev->port;
1161 ctrl->pci_dev = pdev;
1162 ctrl->cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1163 if (!ctrl->cap_base) {
1164 err("%s: Cannot find PCI Express capability\n", __func__);
1167 if (pciehp_readl(ctrl, SLOTCAP, &slot_cap)) {
1168 err("%s: Cannot read SLOTCAP register\n", __func__);
1172 ctrl->slot_cap = slot_cap;
1173 ctrl->first_slot = slot_cap >> 19;
1174 ctrl->slot_device_offset = 0;
1175 ctrl->num_slots = 1;
1176 ctrl->hpc_ops = &pciehp_hpc_ops;
1177 mutex_init(&ctrl->crit_sect);
1178 mutex_init(&ctrl->ctrl_lock);
1179 init_waitqueue_head(&ctrl->queue);
1182 * Controller doesn't notify of command completion if the "No
1183 * Command Completed Support" bit is set in Slot Capability
1184 * register or the controller supports none of power
1185 * controller, attention led, power led and EMI.
1187 if (NO_CMD_CMPL(ctrl) ||
1188 !(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
1189 ctrl->no_cmd_complete = 1;
1191 info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
1192 pdev->vendor, pdev->device,
1193 pdev->subsystem_vendor, pdev->subsystem_device);
1195 if (pcie_init_hardware_part1(ctrl, dev))
1198 if (pciehp_request_irq(ctrl))
1202 * If this is the first controller to be initialized,
1203 * initialize the pciehp work queue
1205 if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
1206 pciehp_wq = create_singlethread_workqueue("pciehpd");
1208 goto abort_free_irq;
1212 if (pcie_init_hardware_part2(ctrl, dev))
1213 goto abort_free_irq;
1218 pciehp_free_irq(ctrl);