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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.c129
1 files changed, 98 insertions, 31 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 891f81a0400c..79f104963166 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -247,14 +247,38 @@ static inline void pciehp_free_irq(struct controller *ctrl)
free_irq(ctrl->pci_dev->irq, ctrl);
}
-static inline int pcie_wait_cmd(struct controller *ctrl)
+static inline int pcie_poll_cmd(struct controller *ctrl)
+{
+ u16 slot_status;
+ int timeout = 1000;
+
+ if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status))
+ if (slot_status & CMD_COMPLETED)
+ goto completed;
+ for (timeout = 1000; timeout > 0; timeout -= 100) {
+ msleep(100);
+ if (!pciehp_readw(ctrl, SLOTSTATUS, &slot_status))
+ if (slot_status & CMD_COMPLETED)
+ goto completed;
+ }
+ return 0; /* timeout */
+
+completed:
+ pciehp_writew(ctrl, SLOTSTATUS, CMD_COMPLETED);
+ return timeout;
+}
+
+static inline int pcie_wait_cmd(struct controller *ctrl, int poll)
{
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,
+ if (poll)
+ rc = pcie_poll_cmd(ctrl);
+ else
+ rc = wait_event_interruptible_timeout(ctrl->queue,
!ctrl->cmd_busy, timeout);
if (!rc)
dbg("Command not completed in 1000 msec\n");
@@ -286,12 +310,28 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
goto out;
}
- 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",
- __func__);
+ 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);
@@ -315,8 +355,18 @@ static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
/*
* Wait for command completion.
*/
- if (!retval)
- retval = pcie_wait_cmd(ctrl);
+ 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 & HP_INTR_ENABLE) ||
+ !(slot_ctrl & CMD_CMPL_INTR_ENABLE))
+ poll = 1;
+ retval = pcie_wait_cmd(ctrl, poll);
+ }
out:
mutex_unlock(&ctrl->ctrl_lock);
return retval;
@@ -704,13 +754,6 @@ static int hpc_power_off_slot(struct slot * slot)
}
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);
@@ -722,6 +765,7 @@ 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
@@ -756,21 +800,38 @@ static irqreturn_t pcie_isr(int irq, void *dev_id)
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(0, ctrl);
+ pciehp_handle_switch_change(p_slot);
/* Check Attention Button Pressed */
if (intr_loc & ATTN_BUTTN_PRESSED)
- pciehp_handle_attention_button(0, ctrl);
+ pciehp_handle_attention_button(p_slot);
/* Check Presence Detect Changed */
if (intr_loc & PRSN_DETECT_CHANGED)
- pciehp_handle_presence_change(0, ctrl);
+ pciehp_handle_presence_change(p_slot);
/* Check Power Fault Detected */
if (intr_loc & PWR_FAULT_DETECTED)
- pciehp_handle_power_fault(0, ctrl);
+ pciehp_handle_power_fault(p_slot);
return IRQ_HANDLED;
}
@@ -1028,6 +1089,12 @@ static int pciehp_acpi_get_hp_hw_control_from_firmware(struct pci_dev *dev)
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__);
@@ -1040,16 +1107,6 @@ int pcie_init_hardware_part2(struct controller *ctrl, struct pcie_device *dev)
{
u16 cmd, mask;
- /*
- * We need to clear all events before enabling hotplug interrupt
- * notification mechanism in order for hotplug controler to
- * generate interrupts.
- */
- if (pciehp_writew(ctrl, SLOTSTATUS, 0x1f)) {
- err("%s: Cannot write to SLOTSTATUS register\n", __FUNCTION__);
- return -1;
- }
-
cmd = PRSN_DETECT_ENABLE;
if (ATTN_BUTTN(ctrl))
cmd |= ATTN_BUTTN_ENABLE;
@@ -1116,6 +1173,7 @@ static inline void dbg_ctrl(struct controller *ctrl)
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);
@@ -1147,6 +1205,15 @@ int pcie_init(struct controller *ctrl, struct pcie_device *dev)
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,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 11:01:57 +0100