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android_kernel_motorola_sm6225/drivers/pci/hotplug/pciehp_hpc.c
Kenji Kaneshige 5808639bfa pciehp: fix slow probing 
Fix the "pciehp probing slow" problem reported from Jan C. Nordholz in
http://bugzilla.kernel.org/show_bug.cgi?id=10751.

The command completed bit in Slot Status register applies only to
commands issued to control the attention indicator, power indicator,
power controller, or electromechanical interlock. However, writes to
other parts of the Slot Control register would end up writing to the
control fields. Hence, any write to Slot Control register is
considered as a command. However, if the controller doesn't support
any of attention indicator, power indicator, power controller and
electromechanical interlock, command completed bit would not set in
writing to Slot Control register. In this case, we should not wait for
command completed bit set, otherwise all commands would be considered
not completed in timeout seconds (1 sec.).

The cause of the problem is pciehp driver didn't take this situation
into account. This patch changes pciehp to take it into account. This
patch also add the check for "No Command Completed Support" bit in
Slot Capability register. If it is set, we should not wait for command
completed bit set as well.

This problem seems to be revealed by the commit
c27fb883df that fixed the bug that
pciehp did not wait for command completed properly (pciehp just
ignored the command completion event).

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-05-27 15:43:16 -07:00

1221 lines
31 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 <linux/time.h>
#include "../pci.h"
#include "pciehp.h"
static atomic_t pciehp_num_controllers = ATOMIC_INIT(0);
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 inline int pciehp_readw(struct controller *ctrl, int reg, u16 *value)
{
struct pci_dev *dev = ctrl->pci_dev;
return pci_read_config_word(dev, ctrl->cap_base + reg, value);
}
static inline int pciehp_readl(struct controller *ctrl, int reg, u32 *value)
{
struct pci_dev *dev = ctrl->pci_dev;
return pci_read_config_dword(dev, ctrl->cap_base + reg, value);
}
static inline int pciehp_writew(struct controller *ctrl, int reg, u16 value)
{
struct pci_dev *dev = ctrl->pci_dev;
return pci_write_config_word(dev, ctrl->cap_base + reg, value);
}
static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
{
struct pci_dev *dev = ctrl->pci_dev;
return pci_write_config_dword(dev, ctrl->cap_base + 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
#define EMI_CTRL 0x0800
/* 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
/* EMI Status defines */
#define EMI_DISENGAGED 0
#define EMI_ENGAGED 1
/* 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
#define EMI_STATE 0x0080
#define EMI_STATUS_BIT 7
static irqreturn_t pcie_isr(int irq, void *dev_id);
static void start_int_poll_timer(struct controller *ctrl, int sec);
/* This is the interrupt polling timeout function. */
static void int_poll_timeout(unsigned long data)
{
struct controller *ctrl = (struct controller *)data;
/* Poll for interrupt events. regs == NULL => polling */
pcie_isr(0, ctrl);
init_timer(&ctrl->poll_timer);
if (!pciehp_poll_time)
pciehp_poll_time = 2; /* default polling interval is 2 sec */
start_int_poll_timer(ctrl, pciehp_poll_time);
}
/* This function starts the interrupt polling timer. */
static void start_int_poll_timer(struct controller *ctrl, int sec)
{
/* Clamp to sane value */
if ((sec <= 0) || (sec > 60))
sec = 2;
ctrl->poll_timer.function = &int_poll_timeout;
ctrl->poll_timer.data = (unsigned long)ctrl;
ctrl->poll_timer.expires = jiffies + sec * HZ;
add_timer(&ctrl->poll_timer);
}
static inline int pciehp_request_irq(struct controller *ctrl)
{
int retval, irq = ctrl->pci_dev->irq;
/* Install interrupt polling timer. Start with 10 sec delay */
if (pciehp_poll_mode) {
init_timer(&ctrl->poll_timer);
start_int_poll_timer(ctrl, 10);
return 0;
}
/* Installs the interrupt handler */
retval = request_irq(irq, pcie_isr, IRQF_SHARED, MY_NAME, ctrl);
if (retval)
err("Cannot get irq %d for the hotplug controller\n", irq);
return retval;
}
static inline void pciehp_free_irq(struct controller *ctrl)
{
if (pciehp_poll_mode)
del_timer_sync(&ctrl->poll_timer);
else
free_irq(ctrl->pci_dev->irq, ctrl);
}
static inline int pcie_wait_cmd(struct controller *ctrl)
{
int retval = 0;
unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
unsigned long timeout = msecs_to_jiffies(msecs);
int rc;
rc = wait_event_interruptible_timeout(ctrl->queue,
!ctrl->cmd_busy, timeout);
if (!rc)
dbg("Command not completed in 1000 msec\n");
else if (rc < 0) {
retval = -EINTR;
info("Command was interrupted by a signal\n");
}
return retval;
}
/**
* pcie_write_cmd - Issue controller command
* @ctrl: controller to which the command is issued
* @cmd: command value written to slot control register
* @mask: bitmask of slot control register to be modified
*/
static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
{
int retval = 0;
u16 slot_status;
u16 slot_ctrl;
mutex_lock(&ctrl->ctrl_lock);
retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (retval) {
err("%s: Cannot read SLOTSTATUS register\n", __func__);
goto out;
}
if (slot_status & CMD_COMPLETED) {
if (!ctrl->no_cmd_complete) {
/*
* 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",
__func__);
} else if (!NO_CMD_CMPL(ctrl)) {
/*
* This controller semms to notify of command completed
* event even though it supports none of power
* controller, attention led, power led and EMI.
*/
dbg("%s: Unexpected CMD_COMPLETED. Need to wait for "
"command completed event.\n", __func__);
ctrl->no_cmd_complete = 0;
} else {
dbg("%s: Unexpected CMD_COMPLETED. Maybe the "
"controller is broken.\n", __func__);
}
}
retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
if (retval) {
err("%s: Cannot read SLOTCTRL register\n", __func__);
goto out;
}
slot_ctrl &= ~mask;
slot_ctrl |= (cmd & mask);
/* Don't enable command completed if caller is changing it. */
if (!(mask & CMD_CMPL_INTR_ENABLE))
slot_ctrl |= CMD_CMPL_INTR_ENABLE;
ctrl->cmd_busy = 1;
smp_mb();
retval = pciehp_writew(ctrl, SLOTCTRL, slot_ctrl);
if (retval)
err("%s: Cannot write to SLOTCTRL register\n", __func__);
/*
* Wait for command completion.
*/
if (!retval && !ctrl->no_cmd_complete)
retval = pcie_wait_cmd(ctrl);
out:
mutex_unlock(&ctrl->ctrl_lock);
return retval;
}
static int hpc_check_lnk_status(struct controller *ctrl)
{
u16 lnk_status;
int retval = 0;
retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
if (retval) {
err("%s: Cannot read LNKSTATUS register\n", __func__);
return retval;
}
dbg("%s: lnk_status = %x\n", __func__, lnk_status);
if ( (lnk_status & LNK_TRN) || (lnk_status & LNK_TRN_ERR) ||
!(lnk_status & NEG_LINK_WD)) {
err("%s : Link Training Error occurs \n", __func__);
retval = -1;
return retval;
}
return retval;
}
static int hpc_get_attention_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_ctrl;
u8 atten_led_state;
int retval = 0;
retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
if (retval) {
err("%s: Cannot read SLOTCTRL register\n", __func__);
return retval;
}
dbg("%s: SLOTCTRL %x, value read %x\n",
__func__, ctrl->cap_base + SLOTCTRL, 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;
}
return 0;
}
static int hpc_get_power_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_ctrl;
u8 pwr_state;
int retval = 0;
retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
if (retval) {
err("%s: Cannot read SLOTCTRL register\n", __func__);
return retval;
}
dbg("%s: SLOTCTRL %x value read %x\n",
__func__, ctrl->cap_base + SLOTCTRL, 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;
}
return retval;
}
static int hpc_get_latch_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
int retval = 0;
retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (retval) {
err("%s: Cannot read SLOTSTATUS register\n", __func__);
return retval;
}
*status = (((slot_status & MRL_STATE) >> 5) == 0) ? 0 : 1;
return 0;
}
static int hpc_get_adapter_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
u8 card_state;
int retval = 0;
retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (retval) {
err("%s: Cannot read SLOTSTATUS register\n", __func__);
return retval;
}
card_state = (u8)((slot_status & PRSN_STATE) >> 6);
*status = (card_state == 1) ? 1 : 0;
return 0;
}
static int hpc_query_power_fault(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
u8 pwr_fault;
int retval = 0;
retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (retval) {
err("%s: Cannot check for power fault\n", __func__);
return retval;
}
pwr_fault = (u8)((slot_status & PWR_FAULT_DETECTED) >> 1);
return pwr_fault;
}
static int hpc_get_emi_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
int retval = 0;
retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (retval) {
err("%s : Cannot check EMI status\n", __func__);
return retval;
}
*status = (slot_status & EMI_STATE) >> EMI_STATUS_BIT;
return retval;
}
static int hpc_toggle_emi(struct slot *slot)
{
u16 slot_cmd;
u16 cmd_mask;
int rc;
slot_cmd = EMI_CTRL;
cmd_mask = EMI_CTRL;
rc = pcie_write_cmd(slot->ctrl, slot_cmd, cmd_mask);
slot->last_emi_toggle = get_seconds();
return rc;
}
static int hpc_set_attention_status(struct slot *slot, u8 value)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
u16 cmd_mask;
int rc;
cmd_mask = ATTN_LED_CTRL;
switch (value) {
case 0 : /* turn off */
slot_cmd = 0x00C0;
break;
case 1: /* turn on */
slot_cmd = 0x0040;
break;
case 2: /* turn blink */
slot_cmd = 0x0080;
break;
default:
return -1;
}
rc = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
return rc;
}
static void hpc_set_green_led_on(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
u16 cmd_mask;
slot_cmd = 0x0100;
cmd_mask = PWR_LED_CTRL;
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
}
static void hpc_set_green_led_off(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
u16 cmd_mask;
slot_cmd = 0x0300;
cmd_mask = PWR_LED_CTRL;
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
}
static void hpc_set_green_led_blink(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
u16 cmd_mask;
slot_cmd = 0x0200;
cmd_mask = PWR_LED_CTRL;
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
}
static void hpc_release_ctlr(struct controller *ctrl)
{
/* Mask Hot-plug Interrupt Enable */
if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE))
err("%s: Cannot mask hotplut interrupt enable\n", __func__);
/* Free interrupt handler or interrupt polling timer */
pciehp_free_irq(ctrl);
/*
* If this is the last controller to be released, destroy the
* pciehp work queue
*/
if (atomic_dec_and_test(&pciehp_num_controllers))
destroy_workqueue(pciehp_wq);
}
static int hpc_power_on_slot(struct slot * slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
u16 cmd_mask;
u16 slot_status;
int retval = 0;
dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
/* Clear sticky power-fault bit from previous power failures */
retval = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (retval) {
err("%s: Cannot read SLOTSTATUS register\n", __func__);
return retval;
}
slot_status &= PWR_FAULT_DETECTED;
if (slot_status) {
retval = pciehp_writew(ctrl, SLOTSTATUS, slot_status);
if (retval) {
err("%s: Cannot write to SLOTSTATUS register\n",
__func__);
return retval;
}
}
slot_cmd = POWER_ON;
cmd_mask = PWR_CTRL;
/* Enable detection that we turned off at slot power-off time */
if (!pciehp_poll_mode) {
slot_cmd |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
PRSN_DETECT_ENABLE);
cmd_mask |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
PRSN_DETECT_ENABLE);
}
retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
if (retval) {
err("%s: Write %x command failed!\n", __func__, slot_cmd);
return -1;
}
dbg("%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
return retval;
}
static inline int pcie_mask_bad_dllp(struct controller *ctrl)
{
struct pci_dev *dev = ctrl->pci_dev;
int pos;
u32 reg;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
if (!pos)
return 0;
pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &reg);
if (reg & PCI_ERR_COR_BAD_DLLP)
return 0;
reg |= PCI_ERR_COR_BAD_DLLP;
pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
return 1;
}
static inline void pcie_unmask_bad_dllp(struct controller *ctrl)
{
struct pci_dev *dev = ctrl->pci_dev;
u32 reg;
int pos;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
if (!pos)
return;
pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &reg);
if (!(reg & PCI_ERR_COR_BAD_DLLP))
return;
reg &= ~PCI_ERR_COR_BAD_DLLP;
pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg);
}
static int hpc_power_off_slot(struct slot * slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
u16 cmd_mask;
int retval = 0;
int changed;
dbg("%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
/*
* Set Bad DLLP Mask bit in Correctable Error Mask
* Register. This is the workaround against Bad DLLP error
* that sometimes happens during turning power off the slot
* which conforms to PCI Express 1.0a spec.
*/
changed = pcie_mask_bad_dllp(ctrl);
slot_cmd = POWER_OFF;
cmd_mask = PWR_CTRL;
/*
* 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 &= ~(PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
PRSN_DETECT_ENABLE);
cmd_mask |= (PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE |
PRSN_DETECT_ENABLE);
}
retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
if (retval) {
err("%s: Write command failed!\n", __func__);
retval = -1;
goto out;
}
dbg("%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + SLOTCTRL, slot_cmd);
/*
* After turning power off, we must wait for at least 1 second
* before taking any action that relies on power having been
* removed from the slot/adapter.
*/
msleep(1000);
out:
if (changed)
pcie_unmask_bad_dllp(ctrl);
return retval;
}
static irqreturn_t pcie_isr(int irq, void *dev_id)
{
struct controller *ctrl = (struct controller *)dev_id;
u16 detected, intr_loc;
struct slot *p_slot;
/*
* In order to guarantee that all interrupt events are
* serviced, we need to re-inspect Slot Status register after
* clearing what is presumed to be the last pending interrupt.
*/
intr_loc = 0;
do {
if (pciehp_readw(ctrl, SLOTSTATUS, &detected)) {
err("%s: Cannot read SLOTSTATUS\n", __func__);
return IRQ_NONE;
}
detected &= (ATTN_BUTTN_PRESSED | PWR_FAULT_DETECTED |
MRL_SENS_CHANGED | PRSN_DETECT_CHANGED |
CMD_COMPLETED);
intr_loc |= detected;
if (!intr_loc)
return IRQ_NONE;
if (pciehp_writew(ctrl, SLOTSTATUS, detected)) {
err("%s: Cannot write to SLOTSTATUS\n", __func__);
return IRQ_NONE;
}
} while (detected);
dbg("%s: intr_loc %x\n", __FUNCTION__, intr_loc);
/* Check Command Complete Interrupt Pending */
if (intr_loc & CMD_COMPLETED) {
ctrl->cmd_busy = 0;
smp_mb();
wake_up_interruptible(&ctrl->queue);
}
if (!(intr_loc & ~CMD_COMPLETED))
return IRQ_HANDLED;
/*
* Return without handling events if this handler routine is
* called before controller initialization is done. This may
* happen if hotplug event or another interrupt that shares
* the IRQ with pciehp arrives before slot initialization is
* done after interrupt handler is registered.
*
* FIXME - Need more structural fixes. We need to be ready to
* handle the event before installing interrupt handler.
*/
p_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
if (!p_slot || !p_slot->hpc_ops)
return IRQ_HANDLED;
/* Check MRL Sensor Changed */
if (intr_loc & MRL_SENS_CHANGED)
pciehp_handle_switch_change(p_slot);
/* Check Attention Button Pressed */
if (intr_loc & ATTN_BUTTN_PRESSED)
pciehp_handle_attention_button(p_slot);
/* Check Presence Detect Changed */
if (intr_loc & PRSN_DETECT_CHANGED)
pciehp_handle_presence_change(p_slot);
/* Check Power Fault Detected */
if (intr_loc & PWR_FAULT_DETECTED)
pciehp_handle_power_fault(p_slot);
return IRQ_HANDLED;
}
static int hpc_get_max_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
{
struct controller *ctrl = slot->ctrl;
enum pcie_link_speed lnk_speed;
u32 lnk_cap;
int retval = 0;
retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
if (retval) {
err("%s: Cannot read LNKCAP register\n", __func__);
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);
return retval;
}
static int hpc_get_max_lnk_width(struct slot *slot,
enum pcie_link_width *value)
{
struct controller *ctrl = slot->ctrl;
enum pcie_link_width lnk_wdth;
u32 lnk_cap;
int retval = 0;
retval = pciehp_readl(ctrl, LNKCAP, &lnk_cap);
if (retval) {
err("%s: Cannot read LNKCAP register\n", __func__);
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);
return retval;
}
static int hpc_get_cur_lnk_speed(struct slot *slot, enum pci_bus_speed *value)
{
struct controller *ctrl = slot->ctrl;
enum pcie_link_speed lnk_speed = PCI_SPEED_UNKNOWN;
int retval = 0;
u16 lnk_status;
retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
if (retval) {
err("%s: Cannot read LNKSTATUS register\n", __func__);
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);
return retval;
}
static int hpc_get_cur_lnk_width(struct slot *slot,
enum pcie_link_width *value)
{
struct controller *ctrl = slot->ctrl;
enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
int retval = 0;
u16 lnk_status;
retval = pciehp_readw(ctrl, LNKSTATUS, &lnk_status);
if (retval) {
err("%s: Cannot read LNKSTATUS register\n", __func__);
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);
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_emi_status = hpc_get_emi_status,
.toggle_emi = hpc_toggle_emi,
.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
static 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_CAP_STRUCTURE_CONTROL |
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;
}
dbg("Cannot get control of hotplug hardware for pci %s\n",
pci_name(dev));
kfree(string.pointer);
return -1;
}
#endif
static int pcie_init_hardware_part1(struct controller *ctrl,
struct pcie_device *dev)
{
/* Clear all remaining event bits in Slot Status register */
if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
err("%s: Cannot write to SLOTSTATUS register\n", __func__);
return -1;
}
/* Mask Hot-plug Interrupt Enable */
if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE)) {
err("%s: Cannot mask hotplug interrupt enable\n", __func__);
return -1;
}
return 0;
}
int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
{
u16 cmd, mask;
cmd = PRSN_DETECT_ENABLE;
if (ATTN_BUTTN(ctrl))
cmd |= ATTN_BUTTN_ENABLE;
if (POWER_CTRL(ctrl))
cmd |= PWR_FAULT_DETECT_ENABLE;
if (MRL_SENS(ctrl))
cmd |= MRL_DETECT_ENABLE;
if (!pciehp_poll_mode)
cmd |= HP_INTR_ENABLE;
mask = PRSN_DETECT_ENABLE | ATTN_BUTTN_ENABLE |
PWR_FAULT_DETECT_ENABLE | MRL_DETECT_ENABLE | HP_INTR_ENABLE;
if (pcie_write_cmd(ctrl, cmd, mask)) {
err("%s: Cannot enable software notification\n", __func__);
goto abort;
}
if (pciehp_force)
dbg("Bypassing BIOS check for pciehp use on %s\n",
pci_name(ctrl->pci_dev));
else if (pciehp_get_hp_hw_control_from_firmware(ctrl->pci_dev))
goto abort_disable_intr;
return 0;
/* We end up here for the many possible ways to fail this API. */
abort_disable_intr:
if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE))
err("%s : disabling interrupts failed\n", __func__);
abort:
return -1;
}
static inline void dbg_ctrl(struct controller *ctrl)
{
int i;
u16 reg16;
struct pci_dev *pdev = ctrl->pci_dev;
if (!pciehp_debug)
return;
dbg("Hotplug Controller:\n");
dbg(" Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n", pci_name(pdev), pdev->irq);
dbg(" Vendor ID : 0x%04x\n", pdev->vendor);
dbg(" Device ID : 0x%04x\n", pdev->device);
dbg(" Subsystem ID : 0x%04x\n", pdev->subsystem_device);
dbg(" Subsystem Vendor ID : 0x%04x\n", pdev->subsystem_vendor);
dbg(" PCIe Cap offset : 0x%02x\n", ctrl->cap_base);
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
if (!pci_resource_len(pdev, i))
continue;
dbg(" PCI resource [%d] : 0x%llx@0x%llx\n", i,
(unsigned long long)pci_resource_len(pdev, i),
(unsigned long long)pci_resource_start(pdev, i));
}
dbg("Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
dbg(" Physical Slot Number : %d\n", ctrl->first_slot);
dbg(" Attention Button : %3s\n", ATTN_BUTTN(ctrl) ? "yes" : "no");
dbg(" Power Controller : %3s\n", POWER_CTRL(ctrl) ? "yes" : "no");
dbg(" MRL Sensor : %3s\n", MRL_SENS(ctrl) ? "yes" : "no");
dbg(" Attention Indicator : %3s\n", ATTN_LED(ctrl) ? "yes" : "no");
dbg(" Power Indicator : %3s\n", PWR_LED(ctrl) ? "yes" : "no");
dbg(" Hot-Plug Surprise : %3s\n", HP_SUPR_RM(ctrl) ? "yes" : "no");
dbg(" EMI Present : %3s\n", EMI(ctrl) ? "yes" : "no");
dbg(" Comamnd Completed : %3s\n", NO_CMD_CMPL(ctrl)? "no" : "yes");
pciehp_readw(ctrl, SLOTSTATUS, &reg16);
dbg("Slot Status : 0x%04x\n", reg16);
pciehp_readw(ctrl, SLOTSTATUS, &reg16);
dbg("Slot Control : 0x%04x\n", reg16);
}
int pcie_init(struct controller *ctrl, struct pcie_device *dev)
{
u32 slot_cap;
struct pci_dev *pdev = dev->port;
ctrl->pci_dev = pdev;
ctrl->cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
if (!ctrl->cap_base) {
err("%s: Cannot find PCI Express capability\n", __func__);
goto abort;
}
if (pciehp_readl(ctrl, SLOTCAP, &slot_cap)) {
err("%s: Cannot read SLOTCAP register\n", __func__);
goto abort;
}
ctrl->slot_cap = slot_cap;
ctrl->first_slot = slot_cap >> 19;
ctrl->slot_device_offset = 0;
ctrl->num_slots = 1;
ctrl->hpc_ops = &pciehp_hpc_ops;
mutex_init(&ctrl->crit_sect);
mutex_init(&ctrl->ctrl_lock);
init_waitqueue_head(&ctrl->queue);
dbg_ctrl(ctrl);
/*
* Controller doesn't notify of command completion if the "No
* Command Completed Support" bit is set in Slot Capability
* register or the controller supports none of power
* controller, attention led, power led and EMI.
*/
if (NO_CMD_CMPL(ctrl) ||
!(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
ctrl->no_cmd_complete = 1;
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);
if (pcie_init_hardware_part1(ctrl, dev))
goto abort;
if (pciehp_request_irq(ctrl))
goto abort;
/*
* If this is the first controller to be initialized,
* initialize the pciehp work queue
*/
if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
pciehp_wq = create_singlethread_workqueue("pciehpd");
if (!pciehp_wq) {
goto abort_free_irq;
}
}
if (pcie_init_hardware_part2(ctrl, dev))
goto abort_free_irq;
return 0;
abort_free_irq:
pciehp_free_irq(ctrl);
abort:
return -1;
}
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