pciehp: Clean up pcie_init()

Clean up pciehp_ini(). This patch is trying to

  - Remove redundant capablity checks that were already done in PCIe
    port bus driver.
  - Separate the code only for debugging and make debug information
    easier to read.
  - Make the entire code easier to read and understand what it is doing.

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>

1 files changed, 88 insertions, 110 deletions

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index df1266cd6861..5cadcd0654cb 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -221,6 +221,32 @@ static void start_int_poll_timer(struct controller *ctrl, int sec)
         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;
@@ -541,10 +567,8 @@ static void hpc_release_ctlr(struct controller *ctrl)
         if (pcie_write_cmd(ctrl, 0, HP_INTR_ENABLE | CMD_CMPL_INTR_ENABLE))
                 err("%s: Cannot mask hotplut interrupt enable\n", __func__);
 
-        if (pciehp_poll_mode)
-                del_timer(&ctrl->poll_timer);
-        else
-                free_irq(ctrl->pci_dev->irq, ctrl);
+        /* Free interrupt handler or interrupt polling timer */
+        pciehp_free_irq(ctrl);
 
         /*
          * If this is the last controller to be released, destroy the
@@ -1057,121 +1081,79 @@ abort:
         return -1;
 }
 
-int pcie_init(struct controller *ctrl, struct pcie_device *dev)
+static inline void dbg_ctrl(struct controller *ctrl)
 {
-        int rc;
-        u16 cap_reg;
-        u32 slot_cap;
-        int cap_base;
-        u16 slot_status, slot_ctrl;
-        struct pci_dev *pdev;
-
-        pdev = dev->port;
-        ctrl->pci_dev = pdev;   /* save pci_dev in context */
+        int i;
+        u16 reg16;
+        struct pci_dev *pdev = ctrl->pci_dev;
 
-        dbg("%s: hotplug controller vendor id 0x%x device id 0x%x\n",
-                        __func__, pdev->vendor, pdev->device);
+        if (!pciehp_debug)
+                return;
 
-        cap_base = pci_find_capability(pdev, PCI_CAP_ID_EXP);
-        if (cap_base == 0) {
-                dbg("%s: Can't find PCI_CAP_ID_EXP (0x10)\n", __func__);
-                goto abort;
+        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");
+        pciehp_readw(ctrl, SLOTSTATUS, &reg16);
+        dbg("Slot Status            : 0x%04x\n", reg16);
+        pciehp_readw(ctrl, SLOTSTATUS, &reg16);
+        dbg("Slot Control           : 0x%04x\n", reg16);
+}
 
-        ctrl->cap_base = cap_base;
-
-        dbg("%s: pcie_cap_base %x\n", __func__, cap_base);
+int pcie_init(struct controller *ctrl, struct pcie_device *dev)
+{
+        u32 slot_cap;
+        struct pci_dev *pdev = dev->port;
 
-        rc = pciehp_readw(ctrl, CAPREG, &cap_reg);
-        if (rc) {
-                err("%s: Cannot read CAPREG register\n", __func__);
-                goto abort;
-        }
-        dbg("%s: CAPREG offset %x cap_reg %x\n",
-            __func__, ctrl->cap_base + CAPREG, cap_reg);
-
-        if (((cap_reg & SLOT_IMPL) == 0) ||
-            (((cap_reg & DEV_PORT_TYPE) != 0x0040)
-                && ((cap_reg & DEV_PORT_TYPE) != 0x0060))) {
-                dbg("%s : This is not a root port or the port is not "
-                    "connected to a slot\n", __func__);
+        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;
         }
-
-        rc = pciehp_readl(ctrl, SLOTCAP, &slot_cap);
-        if (rc) {
+        if (pciehp_readl(ctrl, SLOTCAP, &slot_cap)) {
                 err("%s: Cannot read SLOTCAP register\n", __func__);
                 goto abort;
         }
-        dbg("%s: SLOTCAP offset %x slot_cap %x\n",
-            __func__, ctrl->cap_base + SLOTCAP, slot_cap);
-
-        if (!(slot_cap & HP_CAP)) {
-                dbg("%s : This slot is not hot-plug capable\n", __func__);
-                goto abort;
-        }
-        /* For debugging purpose */
-        rc = pciehp_readw(ctrl, SLOTSTATUS, &slot_status);
-        if (rc) {
-                err("%s: Cannot read SLOTSTATUS register\n", __func__);
-                goto abort;
-        }
-        dbg("%s: SLOTSTATUS offset %x slot_status %x\n",
-            __func__, ctrl->cap_base + SLOTSTATUS, slot_status);
-
-        rc = pciehp_readw(ctrl, SLOTCTRL, &slot_ctrl);
-        if (rc) {
-                err("%s: Cannot read SLOTCTRL register\n", __func__);
-                goto abort;
-        }
-        dbg("%s: SLOTCTRL offset %x slot_ctrl %x\n",
-            __func__, ctrl->cap_base + SLOTCTRL, slot_ctrl);
-
-        for (rc = 0; rc < DEVICE_COUNT_RESOURCE; rc++)
-                if (pci_resource_len(pdev, rc) > 0)
-                        dbg("pci resource[%d] start=0x%llx(len=0x%llx)\n", rc,
-                            (unsigned long long)pci_resource_start(pdev, rc),
-                            (unsigned long long)pci_resource_len(pdev, rc));
-
-        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);
 
+        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);
-
-        /* setup wait queue */
         init_waitqueue_head(&ctrl->queue);
+        dbg_ctrl(ctrl);
 
-        /* return PCI Controller Info */
-        ctrl->slot_device_offset = 0;
-        ctrl->num_slots = 1;
-        ctrl->first_slot = slot_cap >> 19;
-        ctrl->slot_cap = slot_cap;
+        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);
 
-        rc = pcie_init_hardware_part1(ctrl, dev);
-        if (rc)
+        if (pcie_init_hardware_part1(ctrl, dev))
                 goto abort;
 
-        if (pciehp_poll_mode) {
-                /* Install interrupt polling timer. Start with 10 sec delay */
-                init_timer(&ctrl->poll_timer);
-                start_int_poll_timer(ctrl, 10);
-        } else {
-                /* Installs the interrupt handler */
-                rc = request_irq(ctrl->pci_dev->irq, pcie_isr, IRQF_SHARED,
-                                 MY_NAME, (void *)ctrl);
-                dbg("%s: request_irq %d for hpc%d (returns %d)\n",
-                    __func__, ctrl->pci_dev->irq,
-                    atomic_read(&pciehp_num_controllers), rc);
-                if (rc) {
-                        err("Can't get irq %d for the hotplug controller\n",
-                            ctrl->pci_dev->irq);
-                        goto abort;
-                }
-        }
-        dbg("pciehp ctrl b:d:f:irq=0x%x:%x:%x:%x\n", pdev->bus->number,
-                PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), dev->irq);
+        if (pciehp_request_irq(ctrl))
+                goto abort;
 
         /*
          * If this is the first controller to be initialized,
@@ -1180,21 +1162,17 @@ int pcie_init(struct controller *ctrl, struct pcie_device *dev)
         if (atomic_add_return(1, &pciehp_num_controllers) == 1) {
                 pciehp_wq = create_singlethread_workqueue("pciehpd");
                 if (!pciehp_wq) {
-                        rc = -ENOMEM;
                         goto abort_free_irq;
                 }
         }
 
-        rc = pcie_init_hardware_part2(ctrl, dev);
-        if (rc == 0) {
-                ctrl->hpc_ops = &pciehp_hpc_ops;
-                return 0;
-        }
+        if (pcie_init_hardware_part2(ctrl, dev))
+                goto abort_free_irq;
+
+        return 0;
+
 abort_free_irq:
-        if (pciehp_poll_mode)
-                del_timer_sync(&ctrl->poll_timer);
-        else
-                free_irq(ctrl->pci_dev->irq, ctrl);
+        pciehp_free_irq(ctrl);
 abort:
         return -1;
 }