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path: root/drivers/pci/hotplug/pciehp_hpc.c
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Diffstat (limited to 'drivers/pci/hotplug/pciehp_hpc.c')
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c191
1 files changed, 101 insertions, 90 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 9aac6a87eb53..016eea94a8a5 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -275,11 +275,19 @@ static inline int pcie_wait_cmd(struct controller *ctrl)
return retval;
}
-static int pcie_write_cmd(struct slot *slot, u16 cmd)
+/**
+ * pcie_write_cmd - Issue controller command
+ * @slot: slot 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 slot *slot, u16 cmd, u16 mask)
{
struct controller *ctrl = slot->ctrl;
int retval = 0;
u16 slot_status;
+ u16 slot_ctrl;
+ unsigned long flags;
DBG_ENTER_ROUTINE
@@ -299,17 +307,29 @@ static int pcie_write_cmd(struct slot *slot, u16 cmd)
__FUNCTION__);
}
- ctrl->cmd_busy = 1;
- retval = pciehp_writew(ctrl, SLOTCTRL, (cmd | CMD_CMPL_INTR_ENABLE));
+ spin_lock_irqsave(&ctrl->lock, flags);
+ retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
if (retval) {
- err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__);
- goto out;
+ err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
+ goto out_spin_unlock;
}
+ slot_ctrl &= ~mask;
+ slot_ctrl |= ((cmd & mask) | CMD_CMPL_INTR_ENABLE);
+
+ ctrl->cmd_busy = 1;
+ retval = pciehp_writew(ctrl, SLOTCTRL, slot_ctrl);
+ if (retval)
+ err("%s: Cannot write to SLOTCTRL register\n", __FUNCTION__);
+
+ out_spin_unlock:
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
/*
* Wait for command completion.
*/
- retval = pcie_wait_cmd(ctrl);
+ if (!retval)
+ retval = pcie_wait_cmd(ctrl);
out:
mutex_unlock(&ctrl->ctrl_lock);
DBG_LEAVE_ROUTINE
@@ -502,25 +522,20 @@ static int hpc_get_emi_status(struct slot *slot, u8 *status)
static int hpc_toggle_emi(struct slot *slot)
{
- struct controller *ctrl = slot->ctrl;
- u16 slot_cmd = 0;
- u16 slot_ctrl;
- int rc = 0;
+ u16 slot_cmd;
+ u16 cmd_mask;
+ int rc;
DBG_ENTER_ROUTINE
- rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (rc) {
- err("%s : hp_register_read_word SLOT_CTRL failed\n",
- __FUNCTION__);
- return rc;
- }
-
- slot_cmd = (slot_ctrl | EMI_CTRL);
- if (!pciehp_poll_mode)
+ slot_cmd = EMI_CTRL;
+ cmd_mask = EMI_CTRL;
+ if (!pciehp_poll_mode) {
slot_cmd = slot_cmd | HP_INTR_ENABLE;
+ cmd_mask = cmd_mask | HP_INTR_ENABLE;
+ }
- pcie_write_cmd(slot, slot_cmd);
+ rc = pcie_write_cmd(slot, slot_cmd, cmd_mask);
slot->last_emi_toggle = get_seconds();
DBG_LEAVE_ROUTINE
return rc;
@@ -529,35 +544,32 @@ static int hpc_toggle_emi(struct slot *slot)
static int hpc_set_attention_status(struct slot *slot, u8 value)
{
struct controller *ctrl = slot->ctrl;
- u16 slot_cmd = 0;
- u16 slot_ctrl;
- int rc = 0;
+ u16 slot_cmd;
+ u16 cmd_mask;
+ int rc;
DBG_ENTER_ROUTINE
- rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (rc) {
- err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
- return rc;
- }
-
+ cmd_mask = ATTN_LED_CTRL;
switch (value) {
case 0 : /* turn off */
- slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x00C0;
+ slot_cmd = 0x00C0;
break;
case 1: /* turn on */
- slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x0040;
+ slot_cmd = 0x0040;
break;
case 2: /* turn blink */
- slot_cmd = (slot_ctrl & ~ATTN_LED_CTRL) | 0x0080;
+ slot_cmd = 0x0080;
break;
default:
return -1;
}
- if (!pciehp_poll_mode)
- slot_cmd = slot_cmd | HP_INTR_ENABLE;
+ if (!pciehp_poll_mode) {
+ slot_cmd = slot_cmd | HP_INTR_ENABLE;
+ cmd_mask = cmd_mask | HP_INTR_ENABLE;
+ }
- pcie_write_cmd(slot, slot_cmd);
+ rc = pcie_write_cmd(slot, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
@@ -570,21 +582,18 @@ static void hpc_set_green_led_on(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
- u16 slot_ctrl;
- int rc = 0;
+ u16 cmd_mask;
DBG_ENTER_ROUTINE
- rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (rc) {
- err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
- return;
+ slot_cmd = 0x0100;
+ cmd_mask = PWR_LED_CTRL;
+ if (!pciehp_poll_mode) {
+ slot_cmd = slot_cmd | HP_INTR_ENABLE;
+ cmd_mask = cmd_mask | HP_INTR_ENABLE;
}
- 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);
+ pcie_write_cmd(slot, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
@@ -596,22 +605,18 @@ static void hpc_set_green_led_off(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
- u16 slot_ctrl;
- int rc = 0;
+ u16 cmd_mask;
DBG_ENTER_ROUTINE
- rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (rc) {
- err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
- return;
+ slot_cmd = 0x0300;
+ cmd_mask = PWR_LED_CTRL;
+ if (!pciehp_poll_mode) {
+ slot_cmd = slot_cmd | HP_INTR_ENABLE;
+ cmd_mask = cmd_mask | HP_INTR_ENABLE;
}
- 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);
+ pcie_write_cmd(slot, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
@@ -623,22 +628,18 @@ static void hpc_set_green_led_blink(struct slot *slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
- u16 slot_ctrl;
- int rc = 0;
+ u16 cmd_mask;
DBG_ENTER_ROUTINE
- rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (rc) {
- err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
- return;
+ slot_cmd = 0x0200;
+ cmd_mask = PWR_LED_CTRL;
+ if (!pciehp_poll_mode) {
+ slot_cmd = slot_cmd | HP_INTR_ENABLE;
+ cmd_mask = cmd_mask | HP_INTR_ENABLE;
}
- 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);
+ pcie_write_cmd(slot, slot_cmd, cmd_mask);
dbg("%s: SLOTCTRL %x write cmd %x\n",
__FUNCTION__, ctrl->cap_base + SLOTCTRL, slot_cmd);
@@ -669,7 +670,8 @@ static int hpc_power_on_slot(struct slot * slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
- u16 slot_ctrl, slot_status;
+ u16 cmd_mask;
+ u16 slot_status;
int retval = 0;
DBG_ENTER_ROUTINE
@@ -692,23 +694,23 @@ static int hpc_power_on_slot(struct slot * slot)
}
}
- retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (retval) {
- err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
- return retval;
- }
-
- slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_ON;
-
+ slot_cmd = POWER_ON;
+ cmd_mask = PWR_CTRL;
/* Enable detection that we turned off at slot power-off time */
- if (!pciehp_poll_mode)
+ if (!pciehp_poll_mode) {
slot_cmd = slot_cmd |
PWR_FAULT_DETECT_ENABLE |
MRL_DETECT_ENABLE |
PRSN_DETECT_ENABLE |
HP_INTR_ENABLE;
+ cmd_mask = cmd_mask |
+ PWR_FAULT_DETECT_ENABLE |
+ MRL_DETECT_ENABLE |
+ PRSN_DETECT_ENABLE |
+ HP_INTR_ENABLE;
+ }
- retval = pcie_write_cmd(slot, slot_cmd);
+ retval = pcie_write_cmd(slot, slot_cmd, cmd_mask);
if (retval) {
err("%s: Write %x command failed!\n", __FUNCTION__, slot_cmd);
@@ -726,21 +728,15 @@ static int hpc_power_off_slot(struct slot * slot)
{
struct controller *ctrl = slot->ctrl;
u16 slot_cmd;
- u16 slot_ctrl;
+ u16 cmd_mask;
int retval = 0;
DBG_ENTER_ROUTINE
dbg("%s: slot->hp_slot %x\n", __FUNCTION__, slot->hp_slot);
- retval = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
- if (retval) {
- err("%s: Cannot read SLOTCTRL register\n", __FUNCTION__);
- return retval;
- }
-
- slot_cmd = (slot_ctrl & ~PWR_CTRL) | POWER_OFF;
-
+ 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
@@ -748,14 +744,19 @@ static int hpc_power_off_slot(struct slot * slot)
* of command completions, since the power-fault bit remains on
* till the slot is powered on again.
*/
- if (!pciehp_poll_mode)
+ if (!pciehp_poll_mode) {
slot_cmd = (slot_cmd &
~PWR_FAULT_DETECT_ENABLE &
~MRL_DETECT_ENABLE &
~PRSN_DETECT_ENABLE) | HP_INTR_ENABLE;
+ cmd_mask = cmd_mask |
+ PWR_FAULT_DETECT_ENABLE |
+ MRL_DETECT_ENABLE |
+ PRSN_DETECT_ENABLE |
+ HP_INTR_ENABLE;
+ }
- retval = pcie_write_cmd(slot, slot_cmd);
-
+ retval = pcie_write_cmd(slot, slot_cmd, cmd_mask);
if (retval) {
err("%s: Write command failed!\n", __FUNCTION__);
return -1;
@@ -775,6 +776,7 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
u16 temp_word;
int hp_slot = 0; /* only 1 slot per PCI Express port */
int rc = 0;
+ unsigned long flags;
rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (rc) {
@@ -794,10 +796,12 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
dbg("%s: intr_loc %x\n", __FUNCTION__, intr_loc);
/* Mask Hot-plug Interrupt Enable */
if (!pciehp_poll_mode) {
+ spin_lock_irqsave(&ctrl->lock, flags);
rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
if (rc) {
err("%s: Cannot read SLOT_CTRL register\n",
__FUNCTION__);
+ spin_unlock_irqrestore(&ctrl->lock, flags);
return IRQ_NONE;
}
@@ -808,8 +812,10 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
if (rc) {
err("%s: Cannot write to SLOTCTRL register\n",
__FUNCTION__);
+ spin_unlock_irqrestore(&ctrl->lock, flags);
return IRQ_NONE;
}
+ spin_unlock_irqrestore(&ctrl->lock, flags);
rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (rc) {
@@ -859,10 +865,12 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
}
/* Unmask Hot-plug Interrupt Enable */
if (!pciehp_poll_mode) {
+ spin_lock_irqsave(&ctrl->lock, flags);
rc = pciehp_readw(ctrl, SLOTCTRL, &temp_word);
if (rc) {
err("%s: Cannot read SLOTCTRL register\n",
__FUNCTION__);
+ spin_unlock_irqrestore(&ctrl->lock, flags);
return IRQ_NONE;
}
@@ -873,8 +881,10 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
if (rc) {
err("%s: Cannot write to SLOTCTRL register\n",
__FUNCTION__);
+ spin_unlock_irqrestore(&ctrl->lock, flags);
return IRQ_NONE;
}
+ spin_unlock_irqrestore(&ctrl->lock, flags);
rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
if (rc) {
@@ -1237,6 +1247,7 @@ int pcie_init(struct controller * ctrl, struct pcie_device *dev)
mutex_init(&ctrl->crit_sect);
mutex_init(&ctrl->ctrl_lock);
+ spin_lock_init(&ctrl->lock);
/* setup wait queue */
init_waitqueue_head(&ctrl->queue);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.