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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/pci/hotplug/pciehp_hpc.c

1138 строки
28 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);
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);
}
/* Power Control Command */
#define POWER_ON 0
#define POWER_OFF PCI_EXP_SLTCTL_PCC
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->pcie->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)
ctrl_err(ctrl, "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->pcie->irq, ctrl);
}
static int pcie_poll_cmd(struct controller *ctrl)
{
u16 slot_status;
int err, timeout = 1000;
err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
return 1;
}
while (timeout > 0) {
msleep(10);
timeout -= 10;
err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
return 1;
}
}
return 0; /* timeout */
}
static void pcie_wait_cmd(struct controller *ctrl, int poll)
{
unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
unsigned long timeout = msecs_to_jiffies(msecs);
int rc;
if (poll)
rc = pcie_poll_cmd(ctrl);
else
rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout);
if (!rc)
ctrl_dbg(ctrl, "Command not completed in 1000 msec\n");
}
/**
* 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, PCI_EXP_SLTSTA, &slot_status);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
__func__);
goto out;
}
if (slot_status & PCI_EXP_SLTSTA_CC) {
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.
*/
ctrl_dbg(ctrl, "CMD_COMPLETED not clear after 1 sec\n");
} 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.
*/
ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Need to "
"wait for command completed event.\n");
ctrl->no_cmd_complete = 0;
} else {
ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Maybe "
"the controller is broken.\n");
}
}
retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
goto out;
}
slot_ctrl &= ~mask;
slot_ctrl |= (cmd & mask);
ctrl->cmd_busy = 1;
smp_mb();
retval = pciehp_writew(ctrl, PCI_EXP_SLTCTL, slot_ctrl);
if (retval)
ctrl_err(ctrl, "Cannot write to SLOTCTRL register\n");
/*
* Wait for command completion.
*/
if (!retval && !ctrl->no_cmd_complete) {
int poll = 0;
/*
* if hotplug interrupt is not enabled or command
* completed interrupt is not enabled, we need to poll
* command completed event.
*/
if (!(slot_ctrl & PCI_EXP_SLTCTL_HPIE) ||
!(slot_ctrl & PCI_EXP_SLTCTL_CCIE))
poll = 1;
pcie_wait_cmd(ctrl, poll);
}
out:
mutex_unlock(&ctrl->ctrl_lock);
return retval;
}
static inline int check_link_active(struct controller *ctrl)
{
u16 link_status;
if (pciehp_readw(ctrl, PCI_EXP_LNKSTA, &link_status))
return 0;
return !!(link_status & PCI_EXP_LNKSTA_DLLLA);
}
static void pcie_wait_link_active(struct controller *ctrl)
{
int timeout = 1000;
if (check_link_active(ctrl))
return;
while (timeout > 0) {
msleep(10);
timeout -= 10;
if (check_link_active(ctrl))
return;
}
ctrl_dbg(ctrl, "Data Link Layer Link Active not set in 1000 msec\n");
}
static int hpc_check_lnk_status(struct controller *ctrl)
{
u16 lnk_status;
int retval = 0;
/*
* Data Link Layer Link Active Reporting must be capable for
* hot-plug capable downstream port. But old controller might
* not implement it. In this case, we wait for 1000 ms.
*/
if (ctrl->link_active_reporting){
/* Wait for Data Link Layer Link Active bit to be set */
pcie_wait_link_active(ctrl);
/*
* We must wait for 100 ms after the Data Link Layer
* Link Active bit reads 1b before initiating a
* configuration access to the hot added device.
*/
msleep(100);
} else
msleep(1000);
retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
if (retval) {
ctrl_err(ctrl, "Cannot read LNKSTATUS register\n");
return retval;
}
ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
if ((lnk_status & PCI_EXP_LNKSTA_LT) ||
!(lnk_status & PCI_EXP_LNKSTA_NLW)) {
ctrl_err(ctrl, "Link Training Error occurs \n");
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, PCI_EXP_SLTCTL, &slot_ctrl);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
return retval;
}
ctrl_dbg(ctrl, "%s: SLOTCTRL %x, value read %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_ctrl);
atten_led_state = (slot_ctrl & PCI_EXP_SLTCTL_AIC) >> 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, PCI_EXP_SLTCTL, &slot_ctrl);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
return retval;
}
ctrl_dbg(ctrl, "%s: SLOTCTRL %x value read %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_ctrl);
pwr_state = (slot_ctrl & PCI_EXP_SLTCTL_PCC) >> 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;
retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
__func__);
return retval;
}
*status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS);
return 0;
}
static int hpc_get_adapter_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
int retval;
retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
__func__);
return retval;
}
*status = !!(slot_status & PCI_EXP_SLTSTA_PDS);
return 0;
}
static int hpc_query_power_fault(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
int retval;
retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
if (retval) {
ctrl_err(ctrl, "Cannot check for power fault\n");
return retval;
}
return !!(slot_status & PCI_EXP_SLTSTA_PFD);
}
static int hpc_get_emi_status(struct slot *slot, u8 *status)
{
struct controller *ctrl = slot->ctrl;
u16 slot_status;
int retval;
retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
if (retval) {
ctrl_err(ctrl, "Cannot check EMI status\n");
return retval;
}
*status = !!(slot_status & PCI_EXP_SLTSTA_EIS);
return retval;
}
static int hpc_toggle_emi(struct slot *slot)
{
u16 slot_cmd;
u16 cmd_mask;
int rc;
slot_cmd = PCI_EXP_SLTCTL_EIC;
cmd_mask = PCI_EXP_SLTCTL_EIC;
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 = PCI_EXP_SLTCTL_AIC;
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);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, 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 = PCI_EXP_SLTCTL_PIC;
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, 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 = PCI_EXP_SLTCTL_PIC;
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, 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 = PCI_EXP_SLTCTL_PIC;
pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
}
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;
ctrl_dbg(ctrl, "%s: slot->hp_slot %x\n", __func__, slot->hp_slot);
/* Clear sticky power-fault bit from previous power failures */
retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
__func__);
return retval;
}
slot_status &= PCI_EXP_SLTSTA_PFD;
if (slot_status) {
retval = pciehp_writew(ctrl, PCI_EXP_SLTSTA, slot_status);
if (retval) {
ctrl_err(ctrl,
"%s: Cannot write to SLOTSTATUS register\n",
__func__);
return retval;
}
}
slot_cmd = POWER_ON;
cmd_mask = PCI_EXP_SLTCTL_PCC;
/* Enable detection that we turned off at slot power-off time */
if (!pciehp_poll_mode) {
slot_cmd |= (PCI_EXP_SLTCTL_PFDE | PCI_EXP_SLTCTL_MRLSCE |
PCI_EXP_SLTCTL_PDCE);
cmd_mask |= (PCI_EXP_SLTCTL_PFDE | PCI_EXP_SLTCTL_MRLSCE |
PCI_EXP_SLTCTL_PDCE);
}
retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
if (retval) {
ctrl_err(ctrl, "Write %x command failed!\n", slot_cmd);
return -1;
}
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, 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;
ctrl_dbg(ctrl, "%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 = PCI_EXP_SLTCTL_PCC;
/*
* 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 &= ~(PCI_EXP_SLTCTL_PFDE | PCI_EXP_SLTCTL_MRLSCE |
PCI_EXP_SLTCTL_PDCE);
cmd_mask |= (PCI_EXP_SLTCTL_PFDE | PCI_EXP_SLTCTL_MRLSCE |
PCI_EXP_SLTCTL_PDCE);
}
retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
if (retval) {
ctrl_err(ctrl, "Write command failed!\n");
retval = -1;
goto out;
}
ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n",
__func__, ctrl->cap_base + PCI_EXP_SLTCTL, slot_cmd);
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, PCI_EXP_SLTSTA, &detected)) {
ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS\n",
__func__);
return IRQ_NONE;
}
detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC |
PCI_EXP_SLTSTA_CC);
intr_loc |= detected;
if (!intr_loc)
return IRQ_NONE;
if (detected && pciehp_writew(ctrl, PCI_EXP_SLTSTA, detected)) {
ctrl_err(ctrl, "%s: Cannot write to SLOTSTATUS\n",
__func__);
return IRQ_NONE;
}
} while (detected);
ctrl_dbg(ctrl, "%s: intr_loc %x\n", __func__, intr_loc);
/* Check Command Complete Interrupt Pending */
if (intr_loc & PCI_EXP_SLTSTA_CC) {
ctrl->cmd_busy = 0;
smp_mb();
wake_up(&ctrl->queue);
}
if (!(intr_loc & ~PCI_EXP_SLTSTA_CC))
return IRQ_HANDLED;
p_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);
/* Check MRL Sensor Changed */
if (intr_loc & PCI_EXP_SLTSTA_MRLSC)
pciehp_handle_switch_change(p_slot);
/* Check Attention Button Pressed */
if (intr_loc & PCI_EXP_SLTSTA_ABP)
pciehp_handle_attention_button(p_slot);
/* Check Presence Detect Changed */
if (intr_loc & PCI_EXP_SLTSTA_PDC)
pciehp_handle_presence_change(p_slot);
/* Check Power Fault Detected */
if (intr_loc & PCI_EXP_SLTSTA_PFD)
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, PCI_EXP_LNKCAP, &lnk_cap);
if (retval) {
ctrl_err(ctrl, "%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;
ctrl_dbg(ctrl, "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, PCI_EXP_LNKCAP, &lnk_cap);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
return retval;
}
switch ((lnk_cap & PCI_EXP_LNKSTA_NLW) >> 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;
ctrl_dbg(ctrl, "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, PCI_EXP_LNKSTA, &lnk_status);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read LNKSTATUS register\n",
__func__);
return retval;
}
switch (lnk_status & PCI_EXP_LNKSTA_CLS) {
case 1:
lnk_speed = PCIE_2PT5GB;
break;
default:
lnk_speed = PCIE_LNK_SPEED_UNKNOWN;
break;
}
*value = lnk_speed;
ctrl_dbg(ctrl, "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, PCI_EXP_LNKSTA, &lnk_status);
if (retval) {
ctrl_err(ctrl, "%s: Cannot read LNKSTATUS register\n",
__func__);
return retval;
}
switch ((lnk_status & PCI_EXP_LNKSTA_NLW) >> 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;
ctrl_dbg(ctrl, "Current link width = %d\n", lnk_wdth);
return retval;
}
static void pcie_release_ctrl(struct controller *ctrl);
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 = pcie_release_ctrl,
.check_lnk_status = hpc_check_lnk_status,
};
int pcie_enable_notification(struct controller *ctrl)
{
u16 cmd, mask;
cmd = PCI_EXP_SLTCTL_PDCE;
if (ATTN_BUTTN(ctrl))
cmd |= PCI_EXP_SLTCTL_ABPE;
if (POWER_CTRL(ctrl))
cmd |= PCI_EXP_SLTCTL_PFDE;
if (MRL_SENS(ctrl))
cmd |= PCI_EXP_SLTCTL_MRLSCE;
if (!pciehp_poll_mode)
cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE;
mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
if (pcie_write_cmd(ctrl, cmd, mask)) {
ctrl_err(ctrl, "Cannot enable software notification\n");
return -1;
}
return 0;
}
static void pcie_disable_notification(struct controller *ctrl)
{
u16 mask;
mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
if (pcie_write_cmd(ctrl, 0, mask))
ctrl_warn(ctrl, "Cannot disable software notification\n");
}
static int pcie_init_notification(struct controller *ctrl)
{
if (pciehp_request_irq(ctrl))
return -1;
if (pcie_enable_notification(ctrl)) {
pciehp_free_irq(ctrl);
return -1;
}
return 0;
}
static void pcie_shutdown_notification(struct controller *ctrl)
{
pcie_disable_notification(ctrl);
pciehp_free_irq(ctrl);
}
static int pcie_init_slot(struct controller *ctrl)
{
struct slot *slot;
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot)
return -ENOMEM;
slot->hp_slot = 0;
slot->ctrl = ctrl;
slot->bus = ctrl->pci_dev->subordinate->number;
slot->device = ctrl->slot_device_offset + slot->hp_slot;
slot->hpc_ops = ctrl->hpc_ops;
slot->number = ctrl->first_slot;
mutex_init(&slot->lock);
INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
list_add(&slot->slot_list, &ctrl->slot_list);
return 0;
}
static void pcie_cleanup_slot(struct controller *ctrl)
{
struct slot *slot;
slot = list_first_entry(&ctrl->slot_list, struct slot, slot_list);
list_del(&slot->slot_list);
cancel_delayed_work(&slot->work);
flush_scheduled_work();
flush_workqueue(pciehp_wq);
kfree(slot);
}
static inline void dbg_ctrl(struct controller *ctrl)
{
int i;
u16 reg16;
struct pci_dev *pdev = ctrl->pci_dev;
if (!pciehp_debug)
return;
ctrl_info(ctrl, "Hotplug Controller:\n");
ctrl_info(ctrl, " Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n",
pci_name(pdev), pdev->irq);
ctrl_info(ctrl, " Vendor ID : 0x%04x\n", pdev->vendor);
ctrl_info(ctrl, " Device ID : 0x%04x\n", pdev->device);
ctrl_info(ctrl, " Subsystem ID : 0x%04x\n",
pdev->subsystem_device);
ctrl_info(ctrl, " Subsystem Vendor ID : 0x%04x\n",
pdev->subsystem_vendor);
ctrl_info(ctrl, " PCIe Cap offset : 0x%02x\n", ctrl->cap_base);
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
if (!pci_resource_len(pdev, i))
continue;
ctrl_info(ctrl, " 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));
}
ctrl_info(ctrl, "Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
ctrl_info(ctrl, " Physical Slot Number : %d\n", ctrl->first_slot);
ctrl_info(ctrl, " Attention Button : %3s\n",
ATTN_BUTTN(ctrl) ? "yes" : "no");
ctrl_info(ctrl, " Power Controller : %3s\n",
POWER_CTRL(ctrl) ? "yes" : "no");
ctrl_info(ctrl, " MRL Sensor : %3s\n",
MRL_SENS(ctrl) ? "yes" : "no");
ctrl_info(ctrl, " Attention Indicator : %3s\n",
ATTN_LED(ctrl) ? "yes" : "no");
ctrl_info(ctrl, " Power Indicator : %3s\n",
PWR_LED(ctrl) ? "yes" : "no");
ctrl_info(ctrl, " Hot-Plug Surprise : %3s\n",
HP_SUPR_RM(ctrl) ? "yes" : "no");
ctrl_info(ctrl, " EMI Present : %3s\n",
EMI(ctrl) ? "yes" : "no");
ctrl_info(ctrl, " Command Completed : %3s\n",
NO_CMD_CMPL(ctrl) ? "no" : "yes");
pciehp_readw(ctrl, PCI_EXP_SLTSTA, &reg16);
ctrl_info(ctrl, "Slot Status : 0x%04x\n", reg16);
pciehp_readw(ctrl, PCI_EXP_SLTCTL, &reg16);
ctrl_info(ctrl, "Slot Control : 0x%04x\n", reg16);
}
struct controller *pcie_init(struct pcie_device *dev)
{
struct controller *ctrl;
u32 slot_cap, link_cap;
struct pci_dev *pdev = dev->port;
ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
if (!ctrl) {
dev_err(&dev->device, "%s: Out of memory\n", __func__);
goto abort;
}
INIT_LIST_HEAD(&ctrl->slot_list);
ctrl->pcie = dev;
ctrl->pci_dev = pdev;
ctrl->cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
if (!ctrl->cap_base) {
ctrl_err(ctrl, "Cannot find PCI Express capability\n");
goto abort_ctrl;
}
if (pciehp_readl(ctrl, PCI_EXP_SLTCAP, &slot_cap)) {
ctrl_err(ctrl, "Cannot read SLOTCAP register\n");
goto abort_ctrl;
}
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;
/* Check if Data Link Layer Link Active Reporting is implemented */
if (pciehp_readl(ctrl, PCI_EXP_LNKCAP, &link_cap)) {
ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
goto abort_ctrl;
}
if (link_cap & PCI_EXP_LNKCAP_DLLLARC) {
ctrl_dbg(ctrl, "Link Active Reporting supported\n");
ctrl->link_active_reporting = 1;
}
/* Clear all remaining event bits in Slot Status register */
if (pciehp_writew(ctrl, PCI_EXP_SLTSTA, 0x1f))
goto abort_ctrl;
/* Disable sotfware notification */
pcie_disable_notification(ctrl);
/*
* 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_ctrl;
}
ctrl_info(ctrl, "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_slot(ctrl))
goto abort_ctrl;
if (pcie_init_notification(ctrl))
goto abort_slot;
return ctrl;
abort_slot:
pcie_cleanup_slot(ctrl);
abort_ctrl:
kfree(ctrl);
abort:
return NULL;
}
void pcie_release_ctrl(struct controller *ctrl)
{
pcie_shutdown_notification(ctrl);
pcie_cleanup_slot(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);
kfree(ctrl);
}
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