/**
* 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 void pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
{
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 slot_status;
u16 slot_ctrl;
mutex_lock(&ctrl->ctrl_lock);
pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
if (slot_status & PCI_EXP_SLTSTA_CC) {
pcie_capability_write_word(pdev, PCI_EXP_SLTSTA,
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 seems 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");
}
}
pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl);
slot_ctrl &= ~mask;
slot_ctrl |= (cmd & mask);
ctrl->cmd_busy = 1;
smp_mb();
pcie_capability_write_word(pdev, PCI_EXP_SLTCTL, slot_ctrl);
/*
* Wait for command completion.
*/
if (!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);
}
mutex_unlock(&ctrl->ctrl_lock);
}
static inline void dbg_ctrl(struct controller *ctrl)
{
int i;
u16 reg16;
struct pci_dev *pdev = ctrl->pcie->port;
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",
pci_pcie_cap(pdev));
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
if (!pci_resource_len(pdev, i))
continue;
ctrl_info(ctrl, " PCI resource [%d] : %pR\n",
i, &pdev->resource[i]);
}
ctrl_info(ctrl, "Slot Capabilities : 0x%08x\n", ctrl->slot_cap);
ctrl_info(ctrl, " Physical Slot Number : %d\n", PSN(ctrl));
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, ®16);
ctrl_info(ctrl, "Slot Status : 0x%04x\n", reg16);
pciehp_readw(ctrl, PCI_EXP_SLTCTL, ®16);
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;
}
ctrl->pcie = dev;
if (!pci_pcie_cap(pdev)) {
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;
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;
return ctrl;
abort_ctrl:
kfree(ctrl);
abort:
return NULL;
}
/**
* 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;
}
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;
}
ctrl->pcie = dev;
pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, &slot_cap);
ctrl->slot_cap = slot_cap;
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 */
pcie_capability_read_dword(pdev, PCI_EXP_LNKCAP, &link_cap);
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 */
pcie_capability_write_word(pdev, PCI_EXP_SLTSTA,
PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC |
PCI_EXP_SLTSTA_CC);
/* Disable software notification */
pcie_disable_notification(ctrl);
ctrl_info(ctrl, "Slot #%d AttnBtn%c AttnInd%c PwrInd%c PwrCtrl%c MRL%c Interlock%c NoCompl%c LLActRep%c\n",
(slot_cap & PCI_EXP_SLTCAP_PSN) >> 19,
FLAG(slot_cap, PCI_EXP_SLTCAP_ABP),
FLAG(slot_cap, PCI_EXP_SLTCAP_AIP),
FLAG(slot_cap, PCI_EXP_SLTCAP_PIP),
FLAG(slot_cap, PCI_EXP_SLTCAP_PCP),
FLAG(slot_cap, PCI_EXP_SLTCAP_MRLSP),
FLAG(slot_cap, PCI_EXP_SLTCAP_EIP),
FLAG(slot_cap, PCI_EXP_SLTCAP_NCCS),
FLAG(link_cap, PCI_EXP_LNKCAP_DLLLARC));
if (pcie_init_slot(ctrl))
goto abort_ctrl;
return ctrl;
abort_ctrl:
kfree(ctrl);
abort:
return NULL;
}