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 #define DBG_K_TRACE_ENTRY ((unsigned int)0x00000001) /* On function entry */
44 #define DBG_K_TRACE_EXIT ((unsigned int)0x00000002) /* On function exit */
45 #define DBG_K_INFO ((unsigned int)0x00000004) /* Info messages */
46 #define DBG_K_ERROR ((unsigned int)0x00000008) /* Error messages */
47 #define DBG_K_TRACE (DBG_K_TRACE_ENTRY|DBG_K_TRACE_EXIT)
48 #define DBG_K_STANDARD (DBG_K_INFO|DBG_K_ERROR|DBG_K_TRACE)
49 /* Redefine this flagword to set debug level */
50 #define DEBUG_LEVEL DBG_K_STANDARD
52 #define DEFINE_DBG_BUFFER char __dbg_str_buf[256];
54 #define DBG_PRINT( dbg_flags, args... ) \
56 if ( DEBUG_LEVEL & ( dbg_flags ) ) \
59 len = sprintf( __dbg_str_buf, "%s:%d: %s: ", \
60 __FILE__, __LINE__, __FUNCTION__ ); \
61 sprintf( __dbg_str_buf + len, args ); \
62 printk( KERN_NOTICE "%s\n", __dbg_str_buf ); \
66 #define DBG_ENTER_ROUTINE DBG_PRINT (DBG_K_TRACE_ENTRY, "%s", "[Entry]");
67 #define DBG_LEAVE_ROUTINE DBG_PRINT (DBG_K_TRACE_EXIT, "%s", "[Exit]");
69 #define DEFINE_DBG_BUFFER
70 #define DBG_ENTER_ROUTINE
71 #define DBG_LEAVE_ROUTINE
90 } __attribute__ ((packed));
92 /* offsets to the controller registers based on the above structure layout */
94 PCIECAPID = offsetof(struct ctrl_reg, cap_id),
95 NXTCAPPTR = offsetof(struct ctrl_reg, nxt_ptr),
96 CAPREG = offsetof(struct ctrl_reg, cap_reg),
97 DEVCAP = offsetof(struct ctrl_reg, dev_cap),
98 DEVCTRL = offsetof(struct ctrl_reg, dev_ctrl),
99 DEVSTATUS = offsetof(struct ctrl_reg, dev_status),
100 LNKCAP = offsetof(struct ctrl_reg, lnk_cap),
101 LNKCTRL = offsetof(struct ctrl_reg, lnk_ctrl),
102 LNKSTATUS = offsetof(struct ctrl_reg, lnk_status),
103 SLOTCAP = offsetof(struct ctrl_reg, slot_cap),
104 SLOTCTRL = offsetof(struct ctrl_reg, slot_ctrl),
105 SLOTSTATUS = offsetof(struct ctrl_reg, slot_status),
106 ROOTCTRL = offsetof(struct ctrl_reg, root_ctrl),
107 ROOTSTATUS = offsetof(struct ctrl_reg, root_status),
110 static inline int pciehp_readw(struct controller *ctrl, int reg, u16 *value)
112 struct pci_dev *dev = ctrl->pci_dev;
113 return pci_read_config_word(dev, ctrl->cap_base + reg, value);
116 static inline int pciehp_readl(struct controller *ctrl, int reg, u32 *value)
118 struct pci_dev *dev = ctrl->pci_dev;
119 return pci_read_config_dword(dev, ctrl->cap_base + reg, value);
122 static inline int pciehp_writew(struct controller *ctrl, int reg, u16 value)
124 struct pci_dev *dev = ctrl->pci_dev;
125 return pci_write_config_word(dev, ctrl->cap_base + reg, value);
128 static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
130 struct pci_dev *dev = ctrl->pci_dev;
131 return pci_write_config_dword(dev, ctrl->cap_base + reg, value);
134 /* Field definitions in PCI Express Capabilities Register */
135 #define CAP_VER 0x000F
136 #define DEV_PORT_TYPE 0x00F0
137 #define SLOT_IMPL 0x0100
138 #define MSG_NUM 0x3E00
140 /* Device or Port Type */
141 #define NAT_ENDPT 0x00
142 #define LEG_ENDPT 0x01
143 #define ROOT_PORT 0x04
144 #define UP_STREAM 0x05
145 #define DN_STREAM 0x06
146 #define PCIE_PCI_BRDG 0x07
147 #define PCI_PCIE_BRDG 0x10
149 /* Field definitions in Device Capabilities Register */
150 #define DATTN_BUTTN_PRSN 0x1000
151 #define DATTN_LED_PRSN 0x2000
152 #define DPWR_LED_PRSN 0x4000
154 /* Field definitions in Link Capabilities Register */
155 #define MAX_LNK_SPEED 0x000F
156 #define MAX_LNK_WIDTH 0x03F0
158 /* Link Width Encoding */
167 /*Field definitions of Link Status Register */
168 #define LNK_SPEED 0x000F
169 #define NEG_LINK_WD 0x03F0
170 #define LNK_TRN_ERR 0x0400
171 #define LNK_TRN 0x0800
172 #define SLOT_CLK_CONF 0x1000
174 /* Field definitions in Slot Capabilities Register */
175 #define ATTN_BUTTN_PRSN 0x00000001
176 #define PWR_CTRL_PRSN 0x00000002
177 #define MRL_SENS_PRSN 0x00000004
178 #define ATTN_LED_PRSN 0x00000008
179 #define PWR_LED_PRSN 0x00000010
180 #define HP_SUPR_RM_SUP 0x00000020
181 #define HP_CAP 0x00000040
182 #define SLOT_PWR_VALUE 0x000003F8
183 #define SLOT_PWR_LIMIT 0x00000C00
184 #define PSN 0xFFF80000 /* PSN: Physical Slot Number */
186 /* Field definitions in Slot Control Register */
187 #define ATTN_BUTTN_ENABLE 0x0001
188 #define PWR_FAULT_DETECT_ENABLE 0x0002
189 #define MRL_DETECT_ENABLE 0x0004
190 #define PRSN_DETECT_ENABLE 0x0008
191 #define CMD_CMPL_INTR_ENABLE 0x0010
192 #define HP_INTR_ENABLE 0x0020
193 #define ATTN_LED_CTRL 0x00C0
194 #define PWR_LED_CTRL 0x0300
195 #define PWR_CTRL 0x0400
196 #define EMI_CTRL 0x0800
198 /* Attention indicator and Power indicator states */
200 #define LED_BLINK 0x10
203 /* Power Control Command */
205 #define POWER_OFF 0x0400
207 /* EMI Status defines */
208 #define EMI_DISENGAGED 0
209 #define EMI_ENGAGED 1
211 /* Field definitions in Slot Status Register */
212 #define ATTN_BUTTN_PRESSED 0x0001
213 #define PWR_FAULT_DETECTED 0x0002
214 #define MRL_SENS_CHANGED 0x0004
215 #define PRSN_DETECT_CHANGED 0x0008
216 #define CMD_COMPLETED 0x0010
217 #define MRL_STATE 0x0020
218 #define PRSN_STATE 0x0040
219 #define EMI_STATE 0x0080
220 #define EMI_STATUS_BIT 7
222 static spinlock_t hpc_event_lock;
224 DEFINE_DBG_BUFFER /* Debug string buffer for entire HPC defined here */
225 static int ctlr_seq_num = 0; /* Controller sequence # */
227 static irqreturn_t pcie_isr(int irq, void *dev_id);
228 static void start_int_poll_timer(struct controller *ctrl, int sec);
230 /* This is the interrupt polling timeout function. */
231 static void int_poll_timeout(unsigned long data)
233 struct controller *ctrl = (struct controller *)data;
237 /* Poll for interrupt events. regs == NULL => polling */
240 init_timer(&ctrl->poll_timer);
241 if (!pciehp_poll_time)
242 pciehp_poll_time = 2; /* reset timer to poll in 2 secs if user doesn't specify at module installation*/
244 start_int_poll_timer(ctrl, pciehp_poll_time);
247 /* This function starts the interrupt polling timer. */
248 static void start_int_poll_timer(struct controller *ctrl, int sec)
250 /* Clamp to sane value */
251 if ((sec <= 0) || (sec > 60))
254 ctrl->poll_timer.function = &int_poll_timeout;
255 ctrl->poll_timer.data = (unsigned long)ctrl;
256 ctrl->poll_timer.expires = jiffies + sec * HZ;
257 add_timer(&ctrl->poll_timer);
260 static inline int pcie_wait_cmd(struct controller *ctrl)
263 unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
264 unsigned long timeout = msecs_to_jiffies(msecs);
267 rc = wait_event_interruptible_timeout(ctrl->queue,
268 !ctrl->cmd_busy, timeout);
270 dbg("Command not completed in 1000 msec\n");
273 info("Command was interrupted by a signal\n");
279 static int pcie_write_cmd(struct slot *slot, u16 cmd)
281 struct controller *ctrl = slot->ctrl;
287 mutex_lock(&ctrl->ctrl_lock);
289 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
291 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
295 if ((slot_status & CMD_COMPLETED) == CMD_COMPLETED ) {
296 /* After 1 sec and CMD_COMPLETED still not set, just
297 proceed forward to issue the next command according
298 to spec. Just print out the error message */
299 dbg("%s: CMD_COMPLETED not clear after 1 sec.\n",
304 retval = pciehp_writew(ctrl, SLOTCTRL, (cmd | CMD_CMPL_INTR_ENABLE));
306 err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__);
311 * Wait for command completion.
313 retval = pcie_wait_cmd(ctrl);
315 mutex_unlock(&ctrl->ctrl_lock);
320 static int hpc_check_lnk_status(struct controller *ctrl)
327 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
329 err("%s: Cannot read LNKSTATUS register\n", __FUNCTION__);
333 dbg("%s: lnk_status = %x\n", __FUNCTION__, lnk_status);
334 if ( (lnk_status & LNK_TRN) || (lnk_status & LNK_TRN_ERR) ||
335 !(lnk_status & NEG_LINK_WD)) {
336 err("%s : Link Training Error occurs \n", __FUNCTION__);
346 static int hpc_get_attention_status(struct slot *slot, u8 *status)
348 struct controller *ctrl = slot->ctrl;
355 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
357 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
361 dbg("%s: SLOTCTRL %x, value read %x\n",
362 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
364 atten_led_state = (slot_ctrl & ATTN_LED_CTRL) >> 6;
366 switch (atten_led_state) {
368 *status = 0xFF; /* Reserved */
371 *status = 1; /* On */
374 *status = 2; /* Blink */
377 *status = 0; /* Off */
388 static int hpc_get_power_status(struct slot *slot, u8 *status)
390 struct controller *ctrl = slot->ctrl;
397 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
399 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
402 dbg("%s: SLOTCTRL %x value read %x\n",
403 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
405 pwr_state = (slot_ctrl & PWR_CTRL) >> 10;
424 static int hpc_get_latch_status(struct slot *slot, u8 *status)
426 struct controller *ctrl = slot->ctrl;
432 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
434 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
438 *status = (((slot_status & MRL_STATE) >> 5) == 0) ? 0 : 1;
444 static int hpc_get_adapter_status(struct slot *slot, u8 *status)
446 struct controller *ctrl = slot->ctrl;
453 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
455 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
458 card_state = (u8)((slot_status & PRSN_STATE) >> 6);
459 *status = (card_state == 1) ? 1 : 0;
465 static int hpc_query_power_fault(struct slot *slot)
467 struct controller *ctrl = slot->ctrl;
474 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
476 err("%s: Cannot check for power fault\n", __FUNCTION__);
479 pwr_fault = (u8)((slot_status & PWR_FAULT_DETECTED) >> 1);
485 static int hpc_get_emi_status(struct slot *slot, u8 *status)
487 struct controller *ctrl = slot->ctrl;
493 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
495 err("%s : Cannot check EMI status\n", __FUNCTION__);
498 *status = (slot_status & EMI_STATE) >> EMI_STATUS_BIT;
504 static int hpc_toggle_emi(struct slot *slot)
506 struct controller *ctrl = slot->ctrl;
513 rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
515 err("%s : hp_register_read_word SLOT_CTRL failed\n",
520 slot_cmd = (slot_ctrl | EMI_CTRL);
521 if (!pciehp_poll_mode)
522 slot_cmd = slot_cmd | HP_INTR_ENABLE;
524 pcie_write_cmd(slot, slot_cmd);
525 slot->last_emi_toggle = get_seconds();
530 static int hpc_set_attention_status(struct slot *slot, u8 value)
532 struct controller *ctrl = slot->ctrl;
539 rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
541 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
546 case 0 : /* turn off */
547 slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x00C0;
549 case 1: /* turn on */
550 slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x0040;
552 case 2: /* turn blink */
553 slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x0080;
558 if (!pciehp_poll_mode)
559 slot_cmd = slot_cmd | HP_INTR_ENABLE;
561 pcie_write_cmd(slot, slot_cmd);
562 dbg("%s: SLOTCTRL %x write cmd %x\n",
563 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
570 static void hpc_set_green_led_on(struct slot *slot)
572 struct controller *ctrl = slot->ctrl;
579 rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
581 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
584 slot_cmd = (slot_ctrl & ~PWR_LED_CTRL) | 0x0100;
585 if (!pciehp_poll_mode)
586 slot_cmd = slot_cmd | HP_INTR_ENABLE;
588 pcie_write_cmd(slot, slot_cmd);
590 dbg("%s: SLOTCTRL %x write cmd %x\n",
591 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
596 static void hpc_set_green_led_off(struct slot *slot)
598 struct controller *ctrl = slot->ctrl;
605 rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
607 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
611 slot_cmd = (slot_ctrl & ~PWR_LED_CTRL) | 0x0300;
613 if (!pciehp_poll_mode)
614 slot_cmd = slot_cmd | HP_INTR_ENABLE;
615 pcie_write_cmd(slot, slot_cmd);
616 dbg("%s: SLOTCTRL %x write cmd %x\n",
617 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
623 static void hpc_set_green_led_blink(struct slot *slot)
625 struct controller *ctrl = slot->ctrl;
632 rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
634 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
638 slot_cmd = (slot_ctrl & ~PWR_LED_CTRL) | 0x0200;
640 if (!pciehp_poll_mode)
641 slot_cmd = slot_cmd | HP_INTR_ENABLE;
642 pcie_write_cmd(slot, slot_cmd);
644 dbg("%s: SLOTCTRL %x write cmd %x\n",
645 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
650 static void hpc_release_ctlr(struct controller *ctrl)
654 if (pciehp_poll_mode)
655 del_timer(&ctrl->poll_timer);
657 free_irq(ctrl->pci_dev->irq, ctrl);
662 static int hpc_power_on_slot(struct slot * slot)
664 struct controller *ctrl = slot->ctrl;
666 u16 slot_ctrl, slot_status;
671 dbg("%s: slot->hp_slot %x\n", __FUNCTION__, slot->hp_slot);
673 /* Clear sticky power-fault bit from previous power failures */
674 retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
676 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
679 slot_status &= PWR_FAULT_DETECTED;
681 retval = pciehp_writew(ctrl, SLOTSTATUS, slot_status);
683 err("%s: Cannot write to SLOTSTATUS register\n",
689 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
691 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
695 slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_ON;
697 /* Enable detection that we turned off at slot power-off time */
698 if (!pciehp_poll_mode)
699 slot_cmd = slot_cmd |
700 PWR_FAULT_DETECT_ENABLE |
705 retval = pcie_write_cmd(slot, slot_cmd);
708 err("%s: Write %x command failed!\n", __FUNCTION__, slot_cmd);
711 dbg("%s: SLOTCTRL %x write cmd %x\n",
712 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
719 static int hpc_power_off_slot(struct slot * slot)
721 struct controller *ctrl = slot->ctrl;
728 dbg("%s: slot->hp_slot %x\n", __FUNCTION__, slot->hp_slot);
730 retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
732 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
736 slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_OFF;
739 * If we get MRL or presence detect interrupts now, the isr
740 * will notice the sticky power-fault bit too and issue power
741 * indicator change commands. This will lead to an endless loop
742 * of command completions, since the power-fault bit remains on
743 * till the slot is powered on again.
745 if (!pciehp_poll_mode)
746 slot_cmd = (slot_cmd &
747 ~PWR_FAULT_DETECT_ENABLE &
749 ~PRSN_DETECT_ENABLE) | HP_INTR_ENABLE;
751 retval = pcie_write_cmd(slot, slot_cmd);
754 err("%s: Write command failed!\n", __FUNCTION__);
757 dbg("%s: SLOTCTRL %x write cmd %x\n",
758 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
765 static irqreturn_t pcie_isr(int irq, void *dev_id)
767 struct controller *ctrl = (struct controller *)dev_id;
768 u16 slot_status, intr_detect, intr_loc;
770 int hp_slot = 0; /* only 1 slot per PCI Express port */
773 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
775 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
779 intr_detect = ( ATTN_BUTTN_PRESSED | PWR_FAULT_DETECTED | MRL_SENS_CHANGED |
780 PRSN_DETECT_CHANGED | CMD_COMPLETED );
782 intr_loc = slot_status & intr_detect;
784 /* Check to see if it was our interrupt */
788 dbg("%s: intr_loc %x\n", __FUNCTION__, intr_loc);
789 /* Mask Hot-plug Interrupt Enable */
790 if (!pciehp_poll_mode) {
791 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
793 err("%s: Cannot read SLOT_CTRL register\n",
798 dbg("%s: pciehp_readw(SLOTCTRL) with value %x\n",
799 __FUNCTION__, temp_word);
800 temp_word = (temp_word & ~HP_INTR_ENABLE & ~CMD_CMPL_INTR_ENABLE) | 0x00;
801 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
803 err("%s: Cannot write to SLOTCTRL register\n",
808 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
810 err("%s: Cannot read SLOT_STATUS register\n",
814 dbg("%s: pciehp_readw(SLOTSTATUS) with value %x\n",
815 __FUNCTION__, slot_status);
817 /* Clear command complete interrupt caused by this write */
819 rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word);
821 err("%s: Cannot write to SLOTSTATUS register\n",
827 if (intr_loc & CMD_COMPLETED) {
829 * Command Complete Interrupt Pending
832 wake_up_interruptible(&ctrl->queue);
835 if (intr_loc & MRL_SENS_CHANGED)
836 pciehp_handle_switch_change(hp_slot, ctrl);
838 if (intr_loc & ATTN_BUTTN_PRESSED)
839 pciehp_handle_attention_button(hp_slot, ctrl);
841 if (intr_loc & PRSN_DETECT_CHANGED)
842 pciehp_handle_presence_change(hp_slot, ctrl);
844 if (intr_loc & PWR_FAULT_DETECTED)
845 pciehp_handle_power_fault(hp_slot, ctrl);
847 /* Clear all events after serving them */
849 rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word);
851 err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__);
854 /* Unmask Hot-plug Interrupt Enable */
855 if (!pciehp_poll_mode) {
856 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
858 err("%s: Cannot read SLOTCTRL register\n",
863 dbg("%s: Unmask Hot-plug Interrupt Enable\n", __FUNCTION__);
864 temp_word = (temp_word & ~HP_INTR_ENABLE) | HP_INTR_ENABLE;
866 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
868 err("%s: Cannot write to SLOTCTRL register\n",
873 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
875 err("%s: Cannot read SLOT_STATUS register\n",
880 /* Clear command complete interrupt caused by this write */
882 rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word);
884 err("%s: Cannot write to SLOTSTATUS failed\n",
888 dbg("%s: pciehp_writew(SLOTSTATUS) with value %x\n",
889 __FUNCTION__, temp_word);
895 static int hpc_get_max_lnk_speed (struct slot *slot, enum pci_bus_speed *value)
897 struct controller *ctrl = slot->ctrl;
898 enum pcie_link_speed lnk_speed;
904 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
906 err("%s: Cannot read LNKCAP register\n", __FUNCTION__);
910 switch (lnk_cap & 0x000F) {
912 lnk_speed = PCIE_2PT5GB;
915 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
920 dbg("Max link speed = %d\n", lnk_speed);
925 static int hpc_get_max_lnk_width (struct slot *slot, enum pcie_link_width *value)
927 struct controller *ctrl = slot->ctrl;
928 enum pcie_link_width lnk_wdth;
934 retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
936 err("%s: Cannot read LNKCAP register\n", __FUNCTION__);
940 switch ((lnk_cap & 0x03F0) >> 4){
942 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
945 lnk_wdth = PCIE_LNK_X1;
948 lnk_wdth = PCIE_LNK_X2;
951 lnk_wdth = PCIE_LNK_X4;
954 lnk_wdth = PCIE_LNK_X8;
957 lnk_wdth = PCIE_LNK_X12;
960 lnk_wdth = PCIE_LNK_X16;
963 lnk_wdth = PCIE_LNK_X32;
966 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
971 dbg("Max link width = %d\n", lnk_wdth);
976 static int hpc_get_cur_lnk_speed (struct slot *slot, enum pci_bus_speed *value)
978 struct controller *ctrl = slot->ctrl;
979 enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
985 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
987 err("%s: Cannot read LNKSTATUS register\n", __FUNCTION__);
991 switch (lnk_status & 0x0F) {
993 lnk_speed = PCIE_2PT5GB;
996 lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
1001 dbg("Current link speed = %d\n", lnk_speed);
1006 static int hpc_get_cur_lnk_width (struct slot *slot, enum pcie_link_width *value)
1008 struct controller *ctrl = slot->ctrl;
1009 enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
1015 retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
1017 err("%s: Cannot read LNKSTATUS register\n", __FUNCTION__);
1021 switch ((lnk_status & 0x03F0) >> 4){
1023 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
1026 lnk_wdth = PCIE_LNK_X1;
1029 lnk_wdth = PCIE_LNK_X2;
1032 lnk_wdth = PCIE_LNK_X4;
1035 lnk_wdth = PCIE_LNK_X8;
1038 lnk_wdth = PCIE_LNK_X12;
1041 lnk_wdth = PCIE_LNK_X16;
1044 lnk_wdth = PCIE_LNK_X32;
1047 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
1052 dbg("Current link width = %d\n", lnk_wdth);
1057 static struct hpc_ops pciehp_hpc_ops = {
1058 .power_on_slot = hpc_power_on_slot,
1059 .power_off_slot = hpc_power_off_slot,
1060 .set_attention_status = hpc_set_attention_status,
1061 .get_power_status = hpc_get_power_status,
1062 .get_attention_status = hpc_get_attention_status,
1063 .get_latch_status = hpc_get_latch_status,
1064 .get_adapter_status = hpc_get_adapter_status,
1065 .get_emi_status = hpc_get_emi_status,
1066 .toggle_emi = hpc_toggle_emi,
1068 .get_max_bus_speed = hpc_get_max_lnk_speed,
1069 .get_cur_bus_speed = hpc_get_cur_lnk_speed,
1070 .get_max_lnk_width = hpc_get_max_lnk_width,
1071 .get_cur_lnk_width = hpc_get_cur_lnk_width,
1073 .query_power_fault = hpc_query_power_fault,
1074 .green_led_on = hpc_set_green_led_on,
1075 .green_led_off = hpc_set_green_led_off,
1076 .green_led_blink = hpc_set_green_led_blink,
1078 .release_ctlr = hpc_release_ctlr,
1079 .check_lnk_status = hpc_check_lnk_status,
1083 int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
1086 acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
1087 struct pci_dev *pdev = dev;
1088 struct pci_bus *parent;
1089 struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
1092 * Per PCI firmware specification, we should run the ACPI _OSC
1093 * method to get control of hotplug hardware before using it.
1094 * If an _OSC is missing, we look for an OSHP to do the same thing.
1095 * To handle different BIOS behavior, we look for _OSC and OSHP
1096 * within the scope of the hotplug controller and its parents, upto
1097 * the host bridge under which this controller exists.
1101 * This hotplug controller was not listed in the ACPI name
1102 * space at all. Try to get acpi handle of parent pci bus.
1104 if (!pdev || !pdev->bus->parent)
1106 parent = pdev->bus->parent;
1107 dbg("Could not find %s in acpi namespace, trying parent\n",
1110 /* Parent must be a host bridge */
1111 handle = acpi_get_pci_rootbridge_handle(
1112 pci_domain_nr(parent),
1115 handle = DEVICE_ACPI_HANDLE(
1116 &(parent->self->dev));
1117 pdev = parent->self;
1121 acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
1122 dbg("Trying to get hotplug control for %s \n",
1123 (char *)string.pointer);
1124 status = pci_osc_control_set(handle,
1125 OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
1126 if (status == AE_NOT_FOUND)
1127 status = acpi_run_oshp(handle);
1128 if (ACPI_SUCCESS(status)) {
1129 dbg("Gained control for hotplug HW for pci %s (%s)\n",
1130 pci_name(dev), (char *)string.pointer);
1131 kfree(string.pointer);
1134 if (acpi_root_bridge(handle))
1137 status = acpi_get_parent(chandle, &handle);
1138 if (ACPI_FAILURE(status))
1142 err("Cannot get control of hotplug hardware for pci %s\n",
1145 kfree(string.pointer);
1152 int pcie_init(struct controller * ctrl, struct pcie_device *dev)
1155 static int first = 1;
1158 u16 intr_enable = 0;
1161 u16 slot_status, slot_ctrl;
1162 struct pci_dev *pdev;
1167 ctrl->pci_dev = pdev; /* save pci_dev in context */
1169 dbg("%s: hotplug controller vendor id 0x%x device id 0x%x\n",
1170 __FUNCTION__, pdev->vendor, pdev->device);
1172 if ((cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP)) == 0) {
1173 dbg("%s: Can't find PCI_CAP_ID_EXP (0x10)\n", __FUNCTION__);
1174 goto abort_free_ctlr;
1177 ctrl->cap_base = cap_base;
1179 dbg("%s: pcie_cap_base %x\n", __FUNCTION__, cap_base);
1181 rc = pciehp_readw(ctrl, CAPREG, &cap_reg);
1183 err("%s: Cannot read CAPREG register\n", __FUNCTION__);
1184 goto abort_free_ctlr;
1186 dbg("%s: CAPREG offset %x cap_reg %x\n",
1187 __FUNCTION__, ctrl->cap_base + CAPREG, cap_reg);
1189 if (((cap_reg & SLOT_IMPL) == 0) || (((cap_reg & DEV_PORT_TYPE) != 0x0040)
1190 && ((cap_reg & DEV_PORT_TYPE) != 0x0060))) {
1191 dbg("%s : This is not a root port or the port is not connected to a slot\n", __FUNCTION__);
1192 goto abort_free_ctlr;
1195 rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap);
1197 err("%s: Cannot read SLOTCAP register\n", __FUNCTION__);
1198 goto abort_free_ctlr;
1200 dbg("%s: SLOTCAP offset %x slot_cap %x\n",
1201 __FUNCTION__, ctrl->cap_base + SLOTCAP, slot_cap);
1203 if (!(slot_cap & HP_CAP)) {
1204 dbg("%s : This slot is not hot-plug capable\n", __FUNCTION__);
1205 goto abort_free_ctlr;
1207 /* For debugging purpose */
1208 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
1210 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
1211 goto abort_free_ctlr;
1213 dbg("%s: SLOTSTATUS offset %x slot_status %x\n",
1214 __FUNCTION__, ctrl->cap_base + SLOTSTATUS, slot_status);
1216 rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
1218 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
1219 goto abort_free_ctlr;
1221 dbg("%s: SLOTCTRL offset %x slot_ctrl %x\n",
1222 __FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
1225 spin_lock_init(&hpc_event_lock);
1229 for ( rc = 0; rc < DEVICE_COUNT_RESOURCE; rc++)
1230 if (pci_resource_len(pdev, rc) > 0)
1231 dbg("pci resource[%d] start=0x%llx(len=0x%llx)\n", rc,
1232 (unsigned long long)pci_resource_start(pdev, rc),
1233 (unsigned long long)pci_resource_len(pdev, rc));
1235 info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n", pdev->vendor, pdev->device,
1236 pdev->subsystem_vendor, pdev->subsystem_device);
1238 mutex_init(&ctrl->crit_sect);
1239 mutex_init(&ctrl->ctrl_lock);
1241 /* setup wait queue */
1242 init_waitqueue_head(&ctrl->queue);
1244 /* return PCI Controller Info */
1245 ctrl->slot_device_offset = 0;
1246 ctrl->num_slots = 1;
1247 ctrl->first_slot = slot_cap >> 19;
1248 ctrl->ctrlcap = slot_cap & 0x0000007f;
1250 /* Mask Hot-plug Interrupt Enable */
1251 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
1253 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
1254 goto abort_free_ctlr;
1257 dbg("%s: SLOTCTRL %x value read %x\n",
1258 __FUNCTION__, ctrl->cap_base + SLOTCTRL, temp_word);
1259 temp_word = (temp_word & ~HP_INTR_ENABLE & ~CMD_CMPL_INTR_ENABLE) | 0x00;
1261 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
1263 err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__);
1264 goto abort_free_ctlr;
1267 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
1269 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
1270 goto abort_free_ctlr;
1273 temp_word = 0x1F; /* Clear all events */
1274 rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word);
1276 err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__);
1277 goto abort_free_ctlr;
1280 if (pciehp_poll_mode) {
1281 /* Install interrupt polling timer. Start with 10 sec delay */
1282 init_timer(&ctrl->poll_timer);
1283 start_int_poll_timer(ctrl, 10);
1285 /* Installs the interrupt handler */
1286 rc = request_irq(ctrl->pci_dev->irq, pcie_isr, IRQF_SHARED,
1287 MY_NAME, (void *)ctrl);
1288 dbg("%s: request_irq %d for hpc%d (returns %d)\n",
1289 __FUNCTION__, ctrl->pci_dev->irq, ctlr_seq_num, rc);
1291 err("Can't get irq %d for the hotplug controller\n",
1292 ctrl->pci_dev->irq);
1293 goto abort_free_ctlr;
1296 dbg("pciehp ctrl b:d:f:irq=0x%x:%x:%x:%x\n", pdev->bus->number,
1297 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), dev->irq);
1299 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
1301 err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
1302 goto abort_free_irq;
1305 intr_enable = intr_enable | PRSN_DETECT_ENABLE;
1307 if (ATTN_BUTTN(slot_cap))
1308 intr_enable = intr_enable | ATTN_BUTTN_ENABLE;
1310 if (POWER_CTRL(slot_cap))
1311 intr_enable = intr_enable | PWR_FAULT_DETECT_ENABLE;
1313 if (MRL_SENS(slot_cap))
1314 intr_enable = intr_enable | MRL_DETECT_ENABLE;
1316 temp_word = (temp_word & ~intr_enable) | intr_enable;
1318 if (pciehp_poll_mode) {
1319 temp_word = (temp_word & ~HP_INTR_ENABLE) | 0x0;
1321 temp_word = (temp_word & ~HP_INTR_ENABLE) | HP_INTR_ENABLE;
1324 /* Unmask Hot-plug Interrupt Enable for the interrupt notification mechanism case */
1325 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
1327 err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__);
1328 goto abort_free_irq;
1330 rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
1332 err("%s: Cannot read SLOTSTATUS register\n", __FUNCTION__);
1333 goto abort_disable_intr;
1336 temp_word = 0x1F; /* Clear all events */
1337 rc = pciehp_writew(ctrl, SLOTSTATUS, temp_word);
1339 err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__);
1340 goto abort_disable_intr;
1344 dbg("Bypassing BIOS check for pciehp use on %s\n",
1345 pci_name(ctrl->pci_dev));
1347 rc = pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev);
1349 goto abort_disable_intr;
1353 ctrl->hpc_ops = &pciehp_hpc_ops;
1358 /* We end up here for the many possible ways to fail this API. */
1360 rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
1362 temp_word &= ~(intr_enable | HP_INTR_ENABLE);
1363 rc = pciehp_writew(ctrl, SLOTCTRL, temp_word);
1366 err("%s : disabling interrupts failed\n", __FUNCTION__);
1369 if (pciehp_poll_mode)
1370 del_timer_sync(&ctrl->poll_timer);
1372 free_irq(ctrl->pci_dev->irq, ctrl);