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linux/drivers/pci/hotplug/pciehp_hpc.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1567 lines
41 KiB
C
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/*
* PCI Express PCI Hot Plug Driver
*
* Copyright (C) 1995,2001 Compaq Computer Corporation
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001 IBM Corp.
* Copyright (C) 2003-2004 Intel Corporation
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com>
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/signal.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include "../pci.h"
#include "pciehp.h"
#ifdef DEBUG
#define DBG_K_TRACE_ENTRY ((unsigned int)0x00000001) /* On function entry */
#define DBG_K_TRACE_EXIT ((unsigned int)0x00000002) /* On function exit */
#define DBG_K_INFO ((unsigned int)0x00000004) /* Info messages */
#define DBG_K_ERROR ((unsigned int)0x00000008) /* Error messages */
#define DBG_K_TRACE (DBG_K_TRACE_ENTRY|DBG_K_TRACE_EXIT)
#define DBG_K_STANDARD (DBG_K_INFO|DBG_K_ERROR|DBG_K_TRACE)
/* Redefine this flagword to set debug level */
#define DEBUG_LEVEL DBG_K_STANDARD
#define DEFINE_DBG_BUFFER char __dbg_str_buf[256];
#define DBG_PRINT( dbg_flags, args... ) \
do { \
if ( DEBUG_LEVEL & ( dbg_flags ) ) \
{ \
int len; \
len = sprintf( __dbg_str_buf, "%s:%d: %s: ", \
__FILE__, __LINE__, __FUNCTION__ ); \
sprintf( __dbg_str_buf + len, args ); \
printk( KERN_NOTICE "%s\n", __dbg_str_buf ); \
} \
} while (0)
#define DBG_ENTER_ROUTINE DBG_PRINT (DBG_K_TRACE_ENTRY, "%s", "[Entry]");
#define DBG_LEAVE_ROUTINE DBG_PRINT (DBG_K_TRACE_EXIT, "%s", "[Exit]");
#else
#define DEFINE_DBG_BUFFER
#define DBG_ENTER_ROUTINE
#define DBG_LEAVE_ROUTINE
#endif /* DEBUG */
struct ctrl_reg {
u8 cap_id;
u8 nxt_ptr;
u16 cap_reg;
u32 dev_cap;
u16 dev_ctrl;
u16 dev_status;
u32 lnk_cap;
u16 lnk_ctrl;
u16 lnk_status;
u32 slot_cap;
u16 slot_ctrl;
u16 slot_status;
u16 root_ctrl;
u16 rsvp;
u32 root_status;
} __attribute__ ((packed));
/* offsets to the controller registers based on the above structure layout */
enum ctrl_offsets {
PCIECAPID = offsetof(struct ctrl_reg, cap_id),
NXTCAPPTR = offsetof(struct ctrl_reg, nxt_ptr),
CAPREG = offsetof(struct ctrl_reg, cap_reg),
DEVCAP = offsetof(struct ctrl_reg, dev_cap),
DEVCTRL = offsetof(struct ctrl_reg, dev_ctrl),
DEVSTATUS = offsetof(struct ctrl_reg, dev_status),
LNKCAP = offsetof(struct ctrl_reg, lnk_cap),
LNKCTRL = offsetof(struct ctrl_reg, lnk_ctrl),
LNKSTATUS = offsetof(struct ctrl_reg, lnk_status),
SLOTCAP = offsetof(struct ctrl_reg, slot_cap),
SLOTCTRL = offsetof(struct ctrl_reg, slot_ctrl),
SLOTSTATUS = offsetof(struct ctrl_reg, slot_status),
ROOTCTRL = offsetof(struct ctrl_reg, root_ctrl),
ROOTSTATUS = offsetof(struct ctrl_reg, root_status),
};
static int pcie_cap_base = 0; /* Base of the PCI Express capability item structure */
#define PCIE_CAP_ID(cb) ( cb + PCIECAPID )
#define NXT_CAP_PTR(cb) ( cb + NXTCAPPTR )
#define CAP_REG(cb) ( cb + CAPREG )
#define DEV_CAP(cb) ( cb + DEVCAP )
#define DEV_CTRL(cb) ( cb + DEVCTRL )
#define DEV_STATUS(cb) ( cb + DEVSTATUS )
#define LNK_CAP(cb) ( cb + LNKCAP )
#define LNK_CTRL(cb) ( cb + LNKCTRL )
#define LNK_STATUS(cb) ( cb + LNKSTATUS )
#define SLOT_CAP(cb) ( cb + SLOTCAP )
#define SLOT_CTRL(cb) ( cb + SLOTCTRL )
#define SLOT_STATUS(cb) ( cb + SLOTSTATUS )
#define ROOT_CTRL(cb) ( cb + ROOTCTRL )
#define ROOT_STATUS(cb) ( cb + ROOTSTATUS )
#define hp_register_read_word(pdev, reg , value) \
pci_read_config_word(pdev, reg, &value)
#define hp_register_read_dword(pdev, reg , value) \
pci_read_config_dword(pdev, reg, &value)
#define hp_register_write_word(pdev, reg , value) \
pci_write_config_word(pdev, reg, value)
#define hp_register_dwrite_word(pdev, reg , value) \
pci_write_config_dword(pdev, reg, value)
/* Field definitions in PCI Express Capabilities Register */
#define CAP_VER 0x000F
#define DEV_PORT_TYPE 0x00F0
#define SLOT_IMPL 0x0100
#define MSG_NUM 0x3E00
/* Device or Port Type */
#define NAT_ENDPT 0x00
#define LEG_ENDPT 0x01
#define ROOT_PORT 0x04
#define UP_STREAM 0x05
#define DN_STREAM 0x06
#define PCIE_PCI_BRDG 0x07
#define PCI_PCIE_BRDG 0x10
/* Field definitions in Device Capabilities Register */
#define DATTN_BUTTN_PRSN 0x1000
#define DATTN_LED_PRSN 0x2000
#define DPWR_LED_PRSN 0x4000
/* Field definitions in Link Capabilities Register */
#define MAX_LNK_SPEED 0x000F
#define MAX_LNK_WIDTH 0x03F0
/* Link Width Encoding */
#define LNK_X1 0x01
#define LNK_X2 0x02
#define LNK_X4 0x04
#define LNK_X8 0x08
#define LNK_X12 0x0C
#define LNK_X16 0x10
#define LNK_X32 0x20
/*Field definitions of Link Status Register */
#define LNK_SPEED 0x000F
#define NEG_LINK_WD 0x03F0
#define LNK_TRN_ERR 0x0400
#define LNK_TRN 0x0800
#define SLOT_CLK_CONF 0x1000
/* Field definitions in Slot Capabilities Register */
#define ATTN_BUTTN_PRSN 0x00000001
#define PWR_CTRL_PRSN 0x00000002
#define MRL_SENS_PRSN 0x00000004
#define ATTN_LED_PRSN 0x00000008
#define PWR_LED_PRSN 0x00000010
#define HP_SUPR_RM_SUP 0x00000020
#define HP_CAP 0x00000040
#define SLOT_PWR_VALUE 0x000003F8
#define SLOT_PWR_LIMIT 0x00000C00
#define PSN 0xFFF80000 /* PSN: Physical Slot Number */
/* Field definitions in Slot Control Register */
#define ATTN_BUTTN_ENABLE 0x0001
#define PWR_FAULT_DETECT_ENABLE 0x0002
#define MRL_DETECT_ENABLE 0x0004
#define PRSN_DETECT_ENABLE 0x0008
#define CMD_CMPL_INTR_ENABLE 0x0010
#define HP_INTR_ENABLE 0x0020
#define ATTN_LED_CTRL 0x00C0
#define PWR_LED_CTRL 0x0300
#define PWR_CTRL 0x0400
/* Attention indicator and Power indicator states */
#define LED_ON 0x01
#define LED_BLINK 0x10
#define LED_OFF 0x11
/* Power Control Command */
#define POWER_ON 0
#define POWER_OFF 0x0400
/* Field definitions in Slot Status Register */
#define ATTN_BUTTN_PRESSED 0x0001
#define PWR_FAULT_DETECTED 0x0002
#define MRL_SENS_CHANGED 0x0004
#define PRSN_DETECT_CHANGED 0x0008
#define CMD_COMPLETED 0x0010
#define MRL_STATE 0x0020
#define PRSN_STATE 0x0040
static spinlock_t hpc_event_lock;
DEFINE_DBG_BUFFER /* Debug string buffer for entire HPC defined here */
static struct php_ctlr_state_s *php_ctlr_list_head; /* HPC state linked list */
static int ctlr_seq_num = 0; /* Controller sequence # */
static spinlock_t list_lock;
static irqreturn_t pcie_isr(int IRQ, void *dev_id);
static void start_int_poll_timer(struct php_ctlr_state_s *php_ctlr, int seconds);
/* This is the interrupt polling timeout function. */
static void int_poll_timeout(unsigned long lphp_ctlr)
{
struct php_ctlr_state_s *php_ctlr = (struct php_ctlr_state_s *)lphp_ctlr;
DBG_ENTER_ROUTINE
if ( !php_ctlr ) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return;
}
/* Poll for interrupt events. regs == NULL => polling */
pcie_isr( 0, (void *)php_ctlr );
init_timer(&php_ctlr->int_poll_timer);
if (!pciehp_poll_time)
pciehp_poll_time = 2; /* reset timer to poll in 2 secs if user doesn't specify at module installation*/
start_int_poll_timer(php_ctlr, pciehp_poll_time);
return;
}
/* This function starts the interrupt polling timer. */
static void start_int_poll_timer(struct php_ctlr_state_s *php_ctlr, int seconds)
{
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return;
}
if ( ( seconds <= 0 ) || ( seconds > 60 ) )
seconds = 2; /* Clamp to sane value */
php_ctlr->int_poll_timer.function = &int_poll_timeout;
php_ctlr->int_poll_timer.data = (unsigned long)php_ctlr; /* Instance data */
php_ctlr->int_poll_timer.expires = jiffies + seconds * HZ;
add_timer(&php_ctlr->int_poll_timer);
return;
}
static int pcie_write_cmd(struct slot *slot, u16 cmd)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
int retval = 0;
u16 slot_status;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(slot->ctrl->cap_base), slot_status);
if (retval) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
return retval;
}
if ((slot_status & CMD_COMPLETED) == CMD_COMPLETED ) {
/* After 1 sec and CMD_COMPLETED still not set, just proceed forward to issue
the next command according to spec. Just print out the error message */
dbg("%s : CMD_COMPLETED not clear after 1 sec.\n", __FUNCTION__);
}
retval = hp_register_write_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), cmd | CMD_CMPL_INTR_ENABLE);
if (retval) {
err("%s : hp_register_write_word SLOT_CTRL failed\n", __FUNCTION__);
return retval;
}
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_check_lnk_status(struct controller *ctrl)
{
struct php_ctlr_state_s *php_ctlr = ctrl->hpc_ctlr_handle;
u16 lnk_status;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, LNK_STATUS(ctrl->cap_base), lnk_status);
if (retval) {
err("%s : hp_register_read_word LNK_STATUS failed\n", __FUNCTION__);
return retval;
}
dbg("%s: lnk_status = %x\n", __FUNCTION__, lnk_status);
if ( (lnk_status & LNK_TRN) || (lnk_status & LNK_TRN_ERR) ||
!(lnk_status & NEG_LINK_WD)) {
err("%s : Link Training Error occurs \n", __FUNCTION__);
retval = -1;
return retval;
}
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_attention_status(struct slot *slot, u8 *status)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_ctrl;
u8 atten_led_state;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (retval) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return retval;
}
dbg("%s: SLOT_CTRL %x, value read %x\n", __FUNCTION__,SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
atten_led_state = (slot_ctrl & ATTN_LED_CTRL) >> 6;
switch (atten_led_state) {
case 0:
*status = 0xFF; /* Reserved */
break;
case 1:
*status = 1; /* On */
break;
case 2:
*status = 2; /* Blink */
break;
case 3:
*status = 0; /* Off */
break;
default:
*status = 0xFF;
break;
}
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_get_power_status(struct slot * slot, u8 *status)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_ctrl;
u8 pwr_state;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (retval) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return retval;
}
dbg("%s: SLOT_CTRL %x value read %x\n", __FUNCTION__, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
pwr_state = (slot_ctrl & PWR_CTRL) >> 10;
switch (pwr_state) {
case 0:
*status = 1;
break;
case 1:
*status = 0;
break;
default:
*status = 0xFF;
break;
}
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_latch_status(struct slot *slot, u8 *status)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_status;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(slot->ctrl->cap_base), slot_status);
if (retval) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
return retval;
}
*status = (((slot_status & MRL_STATE) >> 5) == 0) ? 0 : 1;
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_get_adapter_status(struct slot *slot, u8 *status)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_status;
u8 card_state;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(slot->ctrl->cap_base), slot_status);
if (retval) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
return retval;
}
card_state = (u8)((slot_status & PRSN_STATE) >> 6);
*status = (card_state == 1) ? 1 : 0;
DBG_LEAVE_ROUTINE
return 0;
}
static int hpc_query_power_fault(struct slot * slot)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_status;
u8 pwr_fault;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(slot->ctrl->cap_base), slot_status);
if (retval) {
err("%s : Cannot check for power fault\n", __FUNCTION__);
return retval;
}
pwr_fault = (u8)((slot_status & PWR_FAULT_DETECTED) >> 1);
DBG_LEAVE_ROUTINE
return pwr_fault;
}
static int hpc_set_attention_status(struct slot *slot, u8 value)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_cmd = 0;
u16 slot_ctrl;
int rc = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return -1;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return rc;
}
switch (value) {
case 0 : /* turn off */
slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x00C0;
break;
case 1: /* turn on */
slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x0040;
break;
case 2: /* turn blink */
slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x0080;
break;
default:
return -1;
}
if (!pciehp_poll_mode)
slot_cmd = slot_cmd | HP_INTR_ENABLE;
pcie_write_cmd(slot, slot_cmd);
dbg("%s: SLOT_CTRL %x write cmd %x\n", __FUNCTION__, SLOT_CTRL(slot->ctrl->cap_base), slot_cmd);
DBG_LEAVE_ROUTINE
return rc;
}
static void hpc_set_green_led_on(struct slot *slot)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_cmd;
u16 slot_ctrl;
int rc = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return ;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return ;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return;
}
slot_cmd = (slot_ctrl & ~PWR_LED_CTRL) | 0x0100;
if (!pciehp_poll_mode)
slot_cmd = slot_cmd | HP_INTR_ENABLE;
pcie_write_cmd(slot, slot_cmd);
dbg("%s: SLOT_CTRL %x write cmd %x\n",__FUNCTION__, SLOT_CTRL(slot->ctrl->cap_base), slot_cmd);
DBG_LEAVE_ROUTINE
return;
}
static void hpc_set_green_led_off(struct slot *slot)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_cmd;
u16 slot_ctrl;
int rc = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return ;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return ;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return;
}
slot_cmd = (slot_ctrl & ~PWR_LED_CTRL) | 0x0300;
if (!pciehp_poll_mode)
slot_cmd = slot_cmd | HP_INTR_ENABLE;
pcie_write_cmd(slot, slot_cmd);
dbg("%s: SLOT_CTRL %x write cmd %x\n", __FUNCTION__, SLOT_CTRL(slot->ctrl->cap_base), slot_cmd);
DBG_LEAVE_ROUTINE
return;
}
static void hpc_set_green_led_blink(struct slot *slot)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_cmd;
u16 slot_ctrl;
int rc = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return ;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return ;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return;
}
slot_cmd = (slot_ctrl & ~PWR_LED_CTRL) | 0x0200;
if (!pciehp_poll_mode)
slot_cmd = slot_cmd | HP_INTR_ENABLE;
pcie_write_cmd(slot, slot_cmd);
dbg("%s: SLOT_CTRL %x write cmd %x\n",__FUNCTION__, SLOT_CTRL(slot->ctrl->cap_base), slot_cmd);
DBG_LEAVE_ROUTINE
return;
}
int pcie_get_ctlr_slot_config(struct controller *ctrl,
int *num_ctlr_slots, /* number of slots in this HPC; only 1 in PCIE */
int *first_device_num, /* PCI dev num of the first slot in this PCIE */
int *physical_slot_num, /* phy slot num of the first slot in this PCIE */
u8 *ctrlcap)
{
struct php_ctlr_state_s *php_ctlr = ctrl->hpc_ctlr_handle;
u32 slot_cap;
int rc = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
*first_device_num = 0;
*num_ctlr_slots = 1;
rc = hp_register_read_dword(php_ctlr->pci_dev, SLOT_CAP(ctrl->cap_base), slot_cap);
if (rc) {
err("%s : hp_register_read_dword SLOT_CAP failed\n", __FUNCTION__);
return -1;
}
*physical_slot_num = slot_cap >> 19;
dbg("%s: PSN %d \n", __FUNCTION__, *physical_slot_num);
*ctrlcap = slot_cap & 0x0000007f;
DBG_LEAVE_ROUTINE
return 0;
}
static void hpc_release_ctlr(struct controller *ctrl)
{
struct php_ctlr_state_s *php_ctlr = ctrl->hpc_ctlr_handle;
struct php_ctlr_state_s *p, *p_prev;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return ;
}
if (pciehp_poll_mode) {
del_timer(&php_ctlr->int_poll_timer);
} else {
if (php_ctlr->irq) {
free_irq(php_ctlr->irq, ctrl);
php_ctlr->irq = 0;
if (!pcie_mch_quirk)
pci_disable_msi(php_ctlr->pci_dev);
}
}
if (php_ctlr->pci_dev)
php_ctlr->pci_dev = NULL;
spin_lock(&list_lock);
p = php_ctlr_list_head;
p_prev = NULL;
while (p) {
if (p == php_ctlr) {
if (p_prev)
p_prev->pnext = p->pnext;
else
php_ctlr_list_head = p->pnext;
break;
} else {
p_prev = p;
p = p->pnext;
}
}
spin_unlock(&list_lock);
kfree(php_ctlr);
DBG_LEAVE_ROUTINE
}
static int hpc_power_on_slot(struct slot * slot)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_cmd;
u16 slot_ctrl, slot_status;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
dbg("%s: slot->hp_slot %x\n", __FUNCTION__, slot->hp_slot);
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return -1;
}
/* Clear sticky power-fault bit from previous power failures */
hp_register_read_word(php_ctlr->pci_dev,
SLOT_STATUS(slot->ctrl->cap_base), slot_status);
slot_status &= PWR_FAULT_DETECTED;
if (slot_status)
hp_register_write_word(php_ctlr->pci_dev,
SLOT_STATUS(slot->ctrl->cap_base), slot_status);
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (retval) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return retval;
}
slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_ON;
/* Enable detection that we turned off at slot power-off time */
if (!pciehp_poll_mode)
slot_cmd = slot_cmd |
PWR_FAULT_DETECT_ENABLE |
MRL_DETECT_ENABLE |
PRSN_DETECT_ENABLE |
HP_INTR_ENABLE;
retval = pcie_write_cmd(slot, slot_cmd);
if (retval) {
err("%s: Write %x command failed!\n", __FUNCTION__, slot_cmd);
return -1;
}
dbg("%s: SLOT_CTRL %x write cmd %x\n",__FUNCTION__, SLOT_CTRL(slot->ctrl->cap_base), slot_cmd);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_power_off_slot(struct slot * slot)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
u16 slot_cmd;
u16 slot_ctrl;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
dbg("%s: slot->hp_slot %x\n", __FUNCTION__, slot->hp_slot);
slot->hp_slot = 0;
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(slot->ctrl->cap_base), slot_ctrl);
if (retval) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return retval;
}
slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_OFF;
/*
* If we get MRL or presence detect interrupts now, the isr
* will notice the sticky power-fault bit too and issue power
* indicator change commands. This will lead to an endless loop
* of command completions, since the power-fault bit remains on
* till the slot is powered on again.
*/
if (!pciehp_poll_mode)
slot_cmd = (slot_cmd &
~PWR_FAULT_DETECT_ENABLE &
~MRL_DETECT_ENABLE &
~PRSN_DETECT_ENABLE) | HP_INTR_ENABLE;
retval = pcie_write_cmd(slot, slot_cmd);
if (retval) {
err("%s: Write command failed!\n", __FUNCTION__);
return -1;
}
dbg("%s: SLOT_CTRL %x write cmd %x\n",__FUNCTION__, SLOT_CTRL(slot->ctrl->cap_base), slot_cmd);
DBG_LEAVE_ROUTINE
return retval;
}
static irqreturn_t pcie_isr(int IRQ, void *dev_id)
{
struct controller *ctrl = NULL;
struct php_ctlr_state_s *php_ctlr;
u8 schedule_flag = 0;
u16 slot_status, intr_detect, intr_loc;
u16 temp_word;
int hp_slot = 0; /* only 1 slot per PCI Express port */
int rc = 0;
if (!dev_id)
return IRQ_NONE;
if (!pciehp_poll_mode) {
ctrl = dev_id;
php_ctlr = ctrl->hpc_ctlr_handle;
} else {
php_ctlr = dev_id;
ctrl = (struct controller *)php_ctlr->callback_instance_id;
}
if (!ctrl) {
dbg("%s: dev_id %p ctlr == NULL\n", __FUNCTION__, (void*) dev_id);
return IRQ_NONE;
}
if (!php_ctlr) {
dbg("%s: php_ctlr == NULL\n", __FUNCTION__);
return IRQ_NONE;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), slot_status);
if (rc) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
return IRQ_NONE;
}
intr_detect = ( ATTN_BUTTN_PRESSED | PWR_FAULT_DETECTED | MRL_SENS_CHANGED |
PRSN_DETECT_CHANGED | CMD_COMPLETED );
intr_loc = slot_status & intr_detect;
/* Check to see if it was our interrupt */
if ( !intr_loc )
return IRQ_NONE;
dbg("%s: intr_loc %x\n", __FUNCTION__, intr_loc);
/* Mask Hot-plug Interrupt Enable */
if (!pciehp_poll_mode) {
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return IRQ_NONE;
}
dbg("%s: hp_register_read_word SLOT_CTRL with value %x\n", __FUNCTION__, temp_word);
temp_word = (temp_word & ~HP_INTR_ENABLE & ~CMD_CMPL_INTR_ENABLE) | 0x00;
rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_CTRL failed\n", __FUNCTION__);
return IRQ_NONE;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), slot_status);
if (rc) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
return IRQ_NONE;
}
dbg("%s: hp_register_read_word SLOT_STATUS with value %x\n", __FUNCTION__, slot_status);
/* Clear command complete interrupt caused by this write */
temp_word = 0x1f;
rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_STATUS failed\n", __FUNCTION__);
return IRQ_NONE;
}
}
if (intr_loc & CMD_COMPLETED) {
/*
* Command Complete Interrupt Pending
*/
wake_up_interruptible(&ctrl->queue);
}
if ((php_ctlr->switch_change_callback) && (intr_loc & MRL_SENS_CHANGED))
schedule_flag += php_ctlr->switch_change_callback(
hp_slot, php_ctlr->callback_instance_id);
if ((php_ctlr->attention_button_callback) && (intr_loc & ATTN_BUTTN_PRESSED))
schedule_flag += php_ctlr->attention_button_callback(
hp_slot, php_ctlr->callback_instance_id);
if ((php_ctlr->presence_change_callback) && (intr_loc & PRSN_DETECT_CHANGED))
schedule_flag += php_ctlr->presence_change_callback(
hp_slot , php_ctlr->callback_instance_id);
if ((php_ctlr->power_fault_callback) && (intr_loc & PWR_FAULT_DETECTED))
schedule_flag += php_ctlr->power_fault_callback(
hp_slot, php_ctlr->callback_instance_id);
/* Clear all events after serving them */
temp_word = 0x1F;
rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_STATUS failed\n", __FUNCTION__);
return IRQ_NONE;
}
/* Unmask Hot-plug Interrupt Enable */
if (!pciehp_poll_mode) {
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
return IRQ_NONE;
}
dbg("%s: Unmask Hot-plug Interrupt Enable\n", __FUNCTION__);
temp_word = (temp_word & ~HP_INTR_ENABLE) | HP_INTR_ENABLE;
rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_CTRL failed\n", __FUNCTION__);
return IRQ_NONE;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), slot_status);
if (rc) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
return IRQ_NONE;
}
/* Clear command complete interrupt caused by this write */
temp_word = 0x1F;
rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_STATUS failed\n", __FUNCTION__);
return IRQ_NONE;
}
dbg("%s: hp_register_write_word SLOT_STATUS with value %x\n", __FUNCTION__, temp_word);
}
return IRQ_HANDLED;
}
static int hpc_get_max_lnk_speed (struct slot *slot, enum pci_bus_speed *value)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
enum pcie_link_speed lnk_speed;
u32 lnk_cap;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_dword(php_ctlr->pci_dev, LNK_CAP(slot->ctrl->cap_base), lnk_cap);
if (retval) {
err("%s : hp_register_read_dword LNK_CAP failed\n", __FUNCTION__);
return retval;
}
switch (lnk_cap & 0x000F) {
case 1:
lnk_speed = PCIE_2PT5GB;
break;
default:
lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
break;
}
*value = lnk_speed;
dbg("Max link speed = %d\n", lnk_speed);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_max_lnk_width (struct slot *slot, enum pcie_link_width *value)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
enum pcie_link_width lnk_wdth;
u32 lnk_cap;
int retval = 0;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_dword(php_ctlr->pci_dev, LNK_CAP(slot->ctrl->cap_base), lnk_cap);
if (retval) {
err("%s : hp_register_read_dword LNK_CAP failed\n", __FUNCTION__);
return retval;
}
switch ((lnk_cap & 0x03F0) >> 4){
case 0:
lnk_wdth = PCIE_LNK_WIDTH_RESRV;
break;
case 1:
lnk_wdth = PCIE_LNK_X1;
break;
case 2:
lnk_wdth = PCIE_LNK_X2;
break;
case 4:
lnk_wdth = PCIE_LNK_X4;
break;
case 8:
lnk_wdth = PCIE_LNK_X8;
break;
case 12:
lnk_wdth = PCIE_LNK_X12;
break;
case 16:
lnk_wdth = PCIE_LNK_X16;
break;
case 32:
lnk_wdth = PCIE_LNK_X32;
break;
default:
lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
break;
}
*value = lnk_wdth;
dbg("Max link width = %d\n", lnk_wdth);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_cur_lnk_speed (struct slot *slot, enum pci_bus_speed *value)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
int retval = 0;
u16 lnk_status;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, LNK_STATUS(slot->ctrl->cap_base), lnk_status);
if (retval) {
err("%s : hp_register_read_word LNK_STATUS failed\n", __FUNCTION__);
return retval;
}
switch (lnk_status & 0x0F) {
case 1:
lnk_speed = PCIE_2PT5GB;
break;
default:
lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
break;
}
*value = lnk_speed;
dbg("Current link speed = %d\n", lnk_speed);
DBG_LEAVE_ROUTINE
return retval;
}
static int hpc_get_cur_lnk_width (struct slot *slot, enum pcie_link_width *value)
{
struct php_ctlr_state_s *php_ctlr = slot->ctrl->hpc_ctlr_handle;
enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
int retval = 0;
u16 lnk_status;
DBG_ENTER_ROUTINE
if (!php_ctlr) {
err("%s: Invalid HPC controller handle!\n", __FUNCTION__);
return -1;
}
if (slot->hp_slot >= php_ctlr->num_slots) {
err("%s: Invalid HPC slot number!\n", __FUNCTION__);
return -1;
}
retval = hp_register_read_word(php_ctlr->pci_dev, LNK_STATUS(slot->ctrl->cap_base), lnk_status);
if (retval) {
err("%s : hp_register_read_word LNK_STATUS failed\n", __FUNCTION__);
return retval;
}
switch ((lnk_status & 0x03F0) >> 4){
case 0:
lnk_wdth = PCIE_LNK_WIDTH_RESRV;
break;
case 1:
lnk_wdth = PCIE_LNK_X1;
break;
case 2:
lnk_wdth = PCIE_LNK_X2;
break;
case 4:
lnk_wdth = PCIE_LNK_X4;
break;
case 8:
lnk_wdth = PCIE_LNK_X8;
break;
case 12:
lnk_wdth = PCIE_LNK_X12;
break;
case 16:
lnk_wdth = PCIE_LNK_X16;
break;
case 32:
lnk_wdth = PCIE_LNK_X32;
break;
default:
lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
break;
}
*value = lnk_wdth;
dbg("Current link width = %d\n", lnk_wdth);
DBG_LEAVE_ROUTINE
return retval;
}
static struct hpc_ops pciehp_hpc_ops = {
.power_on_slot = hpc_power_on_slot,
.power_off_slot = hpc_power_off_slot,
.set_attention_status = hpc_set_attention_status,
.get_power_status = hpc_get_power_status,
.get_attention_status = hpc_get_attention_status,
.get_latch_status = hpc_get_latch_status,
.get_adapter_status = hpc_get_adapter_status,
.get_max_bus_speed = hpc_get_max_lnk_speed,
.get_cur_bus_speed = hpc_get_cur_lnk_speed,
.get_max_lnk_width = hpc_get_max_lnk_width,
.get_cur_lnk_width = hpc_get_cur_lnk_width,
.query_power_fault = hpc_query_power_fault,
.green_led_on = hpc_set_green_led_on,
.green_led_off = hpc_set_green_led_off,
.green_led_blink = hpc_set_green_led_blink,
.release_ctlr = hpc_release_ctlr,
.check_lnk_status = hpc_check_lnk_status,
};
#ifdef CONFIG_ACPI
int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
{
acpi_status status;
acpi_handle chandle, handle = DEVICE_ACPI_HANDLE(&(dev->dev));
struct pci_dev *pdev = dev;
struct pci_bus *parent;
struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
/*
* Per PCI firmware specification, we should run the ACPI _OSC
* method to get control of hotplug hardware before using it.
* If an _OSC is missing, we look for an OSHP to do the same thing.
* To handle different BIOS behavior, we look for _OSC and OSHP
* within the scope of the hotplug controller and its parents, upto
* the host bridge under which this controller exists.
*/
while (!handle) {
/*
* This hotplug controller was not listed in the ACPI name
* space at all. Try to get acpi handle of parent pci bus.
*/
if (!pdev || !pdev->bus->parent)
break;
parent = pdev->bus->parent;
dbg("Could not find %s in acpi namespace, trying parent\n",
pci_name(pdev));
if (!parent->self)
/* Parent must be a host bridge */
handle = acpi_get_pci_rootbridge_handle(
pci_domain_nr(parent),
parent->number);
else
handle = DEVICE_ACPI_HANDLE(
&(parent->self->dev));
pdev = parent->self;
}
while (handle) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
dbg("Trying to get hotplug control for %s \n",
(char *)string.pointer);
status = pci_osc_control_set(handle,
OSC_PCI_EXPRESS_NATIVE_HP_CONTROL);
if (status == AE_NOT_FOUND)
status = acpi_run_oshp(handle);
if (ACPI_SUCCESS(status)) {
dbg("Gained control for hotplug HW for pci %s (%s)\n",
pci_name(dev), (char *)string.pointer);
kfree(string.pointer);
return 0;
}
if (acpi_root_bridge(handle))
break;
chandle = handle;
status = acpi_get_parent(chandle, &handle);
if (ACPI_FAILURE(status))
break;
}
err("Cannot get control of hotplug hardware for pci %s\n",
pci_name(dev));
kfree(string.pointer);
return -1;
}
#endif
int pcie_init(struct controller * ctrl, struct pcie_device *dev)
{
struct php_ctlr_state_s *php_ctlr, *p;
void *instance_id = ctrl;
int rc;
static int first = 1;
u16 temp_word;
u16 cap_reg;
u16 intr_enable = 0;
u32 slot_cap;
int cap_base, saved_cap_base;
u16 slot_status, slot_ctrl;
struct pci_dev *pdev;
DBG_ENTER_ROUTINE
spin_lock_init(&list_lock);
php_ctlr = (struct php_ctlr_state_s *) kmalloc(sizeof(struct php_ctlr_state_s), GFP_KERNEL);
if (!php_ctlr) { /* allocate controller state data */
err("%s: HPC controller memory allocation error!\n", __FUNCTION__);
goto abort;
}
memset(php_ctlr, 0, sizeof(struct php_ctlr_state_s));
pdev = dev->port;
php_ctlr->pci_dev = pdev; /* save pci_dev in context */
dbg("%s: hotplug controller vendor id 0x%x device id 0x%x\n",
__FUNCTION__, pdev->vendor, pdev->device);
saved_cap_base = pcie_cap_base;
if ((cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP)) == 0) {
dbg("%s: Can't find PCI_CAP_ID_EXP (0x10)\n", __FUNCTION__);
goto abort_free_ctlr;
}
ctrl->cap_base = cap_base;
dbg("%s: pcie_cap_base %x\n", __FUNCTION__, pcie_cap_base);
rc = hp_register_read_word(pdev, CAP_REG(ctrl->cap_base), cap_reg);
if (rc) {
err("%s : hp_register_read_word CAP_REG failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
dbg("%s: CAP_REG offset %x cap_reg %x\n", __FUNCTION__, CAP_REG(ctrl->cap_base), cap_reg);
if (((cap_reg & SLOT_IMPL) == 0) || (((cap_reg & DEV_PORT_TYPE) != 0x0040)
&& ((cap_reg & DEV_PORT_TYPE) != 0x0060))) {
dbg("%s : This is not a root port or the port is not connected to a slot\n", __FUNCTION__);
goto abort_free_ctlr;
}
rc = hp_register_read_dword(php_ctlr->pci_dev, SLOT_CAP(ctrl->cap_base), slot_cap);
if (rc) {
err("%s : hp_register_read_word CAP_REG failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
dbg("%s: SLOT_CAP offset %x slot_cap %x\n", __FUNCTION__, SLOT_CAP(ctrl->cap_base), slot_cap);
if (!(slot_cap & HP_CAP)) {
dbg("%s : This slot is not hot-plug capable\n", __FUNCTION__);
goto abort_free_ctlr;
}
/* For debugging purpose */
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), slot_status);
if (rc) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
dbg("%s: SLOT_STATUS offset %x slot_status %x\n", __FUNCTION__, SLOT_STATUS(ctrl->cap_base), slot_status);
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_CTRL(ctrl->cap_base), slot_ctrl);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
dbg("%s: SLOT_CTRL offset %x slot_ctrl %x\n", __FUNCTION__, SLOT_CTRL(ctrl->cap_base), slot_ctrl);
if (first) {
spin_lock_init(&hpc_event_lock);
first = 0;
}
for ( rc = 0; rc < DEVICE_COUNT_RESOURCE; rc++)
if (pci_resource_len(pdev, rc) > 0)
dbg("pci resource[%d] start=0x%llx(len=0x%llx)\n", rc,
(unsigned long long)pci_resource_start(pdev, rc),
(unsigned long long)pci_resource_len(pdev, rc));
info("HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n", pdev->vendor, pdev->device,
pdev->subsystem_vendor, pdev->subsystem_device);
mutex_init(&ctrl->crit_sect);
/* setup wait queue */
init_waitqueue_head(&ctrl->queue);
/* find the IRQ */
php_ctlr->irq = dev->irq;
/* Save interrupt callback info */
php_ctlr->attention_button_callback = pciehp_handle_attention_button;
php_ctlr->switch_change_callback = pciehp_handle_switch_change;
php_ctlr->presence_change_callback = pciehp_handle_presence_change;
php_ctlr->power_fault_callback = pciehp_handle_power_fault;
php_ctlr->callback_instance_id = instance_id;
/* return PCI Controller Info */
php_ctlr->slot_device_offset = 0;
php_ctlr->num_slots = 1;
/* Mask Hot-plug Interrupt Enable */
rc = hp_register_read_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
dbg("%s: SLOT_CTRL %x value read %x\n", __FUNCTION__, SLOT_CTRL(ctrl->cap_base), temp_word);
temp_word = (temp_word & ~HP_INTR_ENABLE & ~CMD_CMPL_INTR_ENABLE) | 0x00;
rc = hp_register_write_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_CTRL failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), slot_status);
if (rc) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
temp_word = 0x1F; /* Clear all events */
rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_STATUS failed\n", __FUNCTION__);
goto abort_free_ctlr;
}
if (pciehp_poll_mode) {/* Install interrupt polling code */
/* Install and start the interrupt polling timer */
init_timer(&php_ctlr->int_poll_timer);
start_int_poll_timer( php_ctlr, 10 ); /* start with 10 second delay */
} else {
/* Installs the interrupt handler */
rc = request_irq(php_ctlr->irq, pcie_isr, IRQF_SHARED, MY_NAME, (void *) ctrl);
dbg("%s: request_irq %d for hpc%d (returns %d)\n", __FUNCTION__, php_ctlr->irq, ctlr_seq_num, rc);
if (rc) {
err("Can't get irq %d for the hotplug controller\n", php_ctlr->irq);
goto abort_free_ctlr;
}
}
dbg("pciehp ctrl b:d:f:irq=0x%x:%x:%x:%x\n", pdev->bus->number,
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), dev->irq);
rc = hp_register_read_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_read_word SLOT_CTRL failed\n", __FUNCTION__);
goto abort_free_irq;
}
intr_enable = intr_enable | PRSN_DETECT_ENABLE;
if (ATTN_BUTTN(slot_cap))
intr_enable = intr_enable | ATTN_BUTTN_ENABLE;
if (POWER_CTRL(slot_cap))
intr_enable = intr_enable | PWR_FAULT_DETECT_ENABLE;
if (MRL_SENS(slot_cap))
intr_enable = intr_enable | MRL_DETECT_ENABLE;
temp_word = (temp_word & ~intr_enable) | intr_enable;
if (pciehp_poll_mode) {
temp_word = (temp_word & ~HP_INTR_ENABLE) | 0x0;
} else {
temp_word = (temp_word & ~HP_INTR_ENABLE) | HP_INTR_ENABLE;
}
/* Unmask Hot-plug Interrupt Enable for the interrupt notification mechanism case */
rc = hp_register_write_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_CTRL failed\n", __FUNCTION__);
goto abort_free_irq;
}
rc = hp_register_read_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), slot_status);
if (rc) {
err("%s : hp_register_read_word SLOT_STATUS failed\n", __FUNCTION__);
goto abort_disable_intr;
}
temp_word = 0x1F; /* Clear all events */
rc = hp_register_write_word(php_ctlr->pci_dev, SLOT_STATUS(ctrl->cap_base), temp_word);
if (rc) {
err("%s : hp_register_write_word SLOT_STATUS failed\n", __FUNCTION__);
goto abort_disable_intr;
}
if (pciehp_force) {
dbg("Bypassing BIOS check for pciehp use on %s\n",
pci_name(ctrl->pci_dev));
} else {
rc = pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev);
if (rc)
goto abort_disable_intr;
}
/* Add this HPC instance into the HPC list */
spin_lock(&list_lock);
if (php_ctlr_list_head == 0) {
php_ctlr_list_head = php_ctlr;
p = php_ctlr_list_head;
p->pnext = NULL;
} else {
p = php_ctlr_list_head;
while (p->pnext)
p = p->pnext;
p->pnext = php_ctlr;
}
spin_unlock(&list_lock);
ctlr_seq_num++;
ctrl->hpc_ctlr_handle = php_ctlr;
ctrl->hpc_ops = &pciehp_hpc_ops;
DBG_LEAVE_ROUTINE
return 0;
/* We end up here for the many possible ways to fail this API. */
abort_disable_intr:
rc = hp_register_read_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
if (!rc) {
temp_word &= ~(intr_enable | HP_INTR_ENABLE);
rc = hp_register_write_word(pdev, SLOT_CTRL(ctrl->cap_base), temp_word);
}
if (rc)
err("%s : disabling interrupts failed\n", __FUNCTION__);
abort_free_irq:
if (pciehp_poll_mode)
del_timer_sync(&php_ctlr->int_poll_timer);
else
free_irq(php_ctlr->irq, ctrl);
abort_free_ctlr:
pcie_cap_base = saved_cap_base;
kfree(php_ctlr);
abort:
DBG_LEAVE_ROUTINE
return -1;
}
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