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Message-ID: <20090331152336.26622.15024.stgit@bob.kio>
Date: Tue, 31 Mar 2009 09:23:36 -0600
From: Alex Chiang <achiang@...com>
To: jbarnes@...tuousgeek.org
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 06/15] PCI Hotplug: cpqphp: refactor cpqhp_probe
Apply DeMorgan's theorem:
if ((pdev->revision > 2) || (vendor_id == PCI_VENDOR_ID_INTEL))
turns into
if ((pdev->revision <= 2) && (vendor_id != PCI_VENDOR_ID_INTEL))
Now we can bail out early from the function if the controller is not
supported.
This allows us to un-indent the remainder of the function quite a bit and
make it much more readable.
Fix up some extra braces, and un-indent the 'case' labels in the switch
statement as per CodingStyle.
No functional change.
Signed-off-by: Alex Chiang <achiang@...com>
---
drivers/pci/hotplug/cpqphp_core.c | 382 ++++++++++++++++++-------------------
1 files changed, 185 insertions(+), 197 deletions(-)
diff --git a/drivers/pci/hotplug/cpqphp_core.c b/drivers/pci/hotplug/cpqphp_core.c
index 195c8c9..857e466 100644
--- a/drivers/pci/hotplug/cpqphp_core.c
+++ b/drivers/pci/hotplug/cpqphp_core.c
@@ -887,214 +887,202 @@ static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
* For Intel, each SSID bit identifies a PHP capability.
* Also Intel HPC's may have RID=0.
*/
- if ((pdev->revision > 2) || (vendor_id == PCI_VENDOR_ID_INTEL)) {
- /* TODO: This code can be made to support non-Compaq or Intel
- * subsystem IDs
- */
- rc = pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &subsystem_vid);
- if (rc) {
- err("%s : pci_read_config_word failed\n", __func__);
- goto err_disable_device;
- }
- dbg("Subsystem Vendor ID: %x\n", subsystem_vid);
- if ((subsystem_vid != PCI_VENDOR_ID_COMPAQ) && (subsystem_vid != PCI_VENDOR_ID_INTEL)) {
- err(msg_HPC_non_compaq_or_intel);
- rc = -ENODEV;
- goto err_disable_device;
- }
+ if ((pdev->revision <= 2) && (vendor_id != PCI_VENDOR_ID_INTEL)) {
+ err(msg_HPC_not_supported);
+ return -ENODEV;
+ }
+
+ /* TODO: This code can be made to support non-Compaq or Intel
+ * subsystem IDs
+ */
+ rc = pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &subsystem_vid);
+ if (rc) {
+ err("%s : pci_read_config_word failed\n", __func__);
+ goto err_disable_device;
+ }
+ dbg("Subsystem Vendor ID: %x\n", subsystem_vid);
+ if ((subsystem_vid != PCI_VENDOR_ID_COMPAQ) && (subsystem_vid != PCI_VENDOR_ID_INTEL)) {
+ err(msg_HPC_non_compaq_or_intel);
+ rc = -ENODEV;
+ goto err_disable_device;
+ }
+
+ ctrl = kzalloc(sizeof(struct controller), GFP_KERNEL);
+ if (!ctrl) {
+ err("%s : out of memory\n", __func__);
+ rc = -ENOMEM;
+ goto err_disable_device;
+ }
- ctrl = kzalloc(sizeof(struct controller), GFP_KERNEL);
- if (!ctrl) {
- err("%s : out of memory\n", __func__);
- rc = -ENOMEM;
- goto err_disable_device;
+ rc = pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &subsystem_deviceid);
+ if (rc) {
+ err("%s : pci_read_config_word failed\n", __func__);
+ goto err_free_ctrl;
+ }
+
+ info("Hot Plug Subsystem Device ID: %x\n", subsystem_deviceid);
+
+ /* Set Vendor ID, so it can be accessed later from other
+ * functions
+ */
+ ctrl->vendor_id = vendor_id;
+
+ switch (subsystem_vid) {
+ case PCI_VENDOR_ID_COMPAQ:
+ if (pdev->revision >= 0x13) { /* CIOBX */
+ ctrl->push_flag = 1;
+ ctrl->slot_switch_type = 1;
+ ctrl->push_button = 1;
+ ctrl->pci_config_space = 1;
+ ctrl->defeature_PHP = 1;
+ ctrl->pcix_support = 1;
+ ctrl->pcix_speed_capability = 1;
+ pci_read_config_byte(pdev, 0x41, &bus_cap);
+ if (bus_cap & 0x80) {
+ dbg("bus max supports 133MHz PCI-X\n");
+ ctrl->speed_capability = PCI_SPEED_133MHz_PCIX;
+ break;
+ }
+ if (bus_cap & 0x40) {
+ dbg("bus max supports 100MHz PCI-X\n");
+ ctrl->speed_capability = PCI_SPEED_100MHz_PCIX;
+ break;
+ }
+ if (bus_cap & 20) {
+ dbg("bus max supports 66MHz PCI-X\n");
+ ctrl->speed_capability = PCI_SPEED_66MHz_PCIX;
+ break;
+ }
+ if (bus_cap & 10) {
+ dbg("bus max supports 66MHz PCI\n");
+ ctrl->speed_capability = PCI_SPEED_66MHz;
+ break;
+ }
+
+ break;
}
- rc = pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &subsystem_deviceid);
- if (rc) {
- err("%s : pci_read_config_word failed\n", __func__);
+ switch (subsystem_deviceid) {
+ case PCI_SUB_HPC_ID:
+ /* Original 6500/7000 implementation */
+ ctrl->slot_switch_type = 1;
+ ctrl->speed_capability = PCI_SPEED_33MHz;
+ ctrl->push_button = 0;
+ ctrl->pci_config_space = 1;
+ ctrl->defeature_PHP = 1;
+ ctrl->pcix_support = 0;
+ ctrl->pcix_speed_capability = 0;
+ break;
+ case PCI_SUB_HPC_ID2:
+ /* First Pushbutton implementation */
+ ctrl->push_flag = 1;
+ ctrl->slot_switch_type = 1;
+ ctrl->speed_capability = PCI_SPEED_33MHz;
+ ctrl->push_button = 1;
+ ctrl->pci_config_space = 1;
+ ctrl->defeature_PHP = 1;
+ ctrl->pcix_support = 0;
+ ctrl->pcix_speed_capability = 0;
+ break;
+ case PCI_SUB_HPC_ID_INTC:
+ /* Third party (6500/7000) */
+ ctrl->slot_switch_type = 1;
+ ctrl->speed_capability = PCI_SPEED_33MHz;
+ ctrl->push_button = 0;
+ ctrl->pci_config_space = 1;
+ ctrl->defeature_PHP = 1;
+ ctrl->pcix_support = 0;
+ ctrl->pcix_speed_capability = 0;
+ break;
+ case PCI_SUB_HPC_ID3:
+ /* First 66 Mhz implementation */
+ ctrl->push_flag = 1;
+ ctrl->slot_switch_type = 1;
+ ctrl->speed_capability = PCI_SPEED_66MHz;
+ ctrl->push_button = 1;
+ ctrl->pci_config_space = 1;
+ ctrl->defeature_PHP = 1;
+ ctrl->pcix_support = 0;
+ ctrl->pcix_speed_capability = 0;
+ break;
+ case PCI_SUB_HPC_ID4:
+ /* First PCI-X implementation, 100MHz */
+ ctrl->push_flag = 1;
+ ctrl->slot_switch_type = 1;
+ ctrl->speed_capability = PCI_SPEED_100MHz_PCIX;
+ ctrl->push_button = 1;
+ ctrl->pci_config_space = 1;
+ ctrl->defeature_PHP = 1;
+ ctrl->pcix_support = 1;
+ ctrl->pcix_speed_capability = 0;
+ break;
+ default:
+ err(msg_HPC_not_supported);
+ rc = -ENODEV;
goto err_free_ctrl;
}
+ break;
- info("Hot Plug Subsystem Device ID: %x\n", subsystem_deviceid);
+ case PCI_VENDOR_ID_INTEL:
+ /* Check for speed capability (0=33, 1=66) */
+ if (subsystem_deviceid & 0x0001)
+ ctrl->speed_capability = PCI_SPEED_66MHz;
+ else
+ ctrl->speed_capability = PCI_SPEED_33MHz;
- /* Set Vendor ID, so it can be accessed later from other
- * functions
- */
- ctrl->vendor_id = vendor_id;
-
- switch (subsystem_vid) {
- case PCI_VENDOR_ID_COMPAQ:
- if (pdev->revision >= 0x13) { /* CIOBX */
- ctrl->push_flag = 1;
- ctrl->slot_switch_type = 1;
- ctrl->push_button = 1;
- ctrl->pci_config_space = 1;
- ctrl->defeature_PHP = 1;
- ctrl->pcix_support = 1;
- ctrl->pcix_speed_capability = 1;
- pci_read_config_byte(pdev, 0x41, &bus_cap);
- if (bus_cap & 0x80) {
- dbg("bus max supports 133MHz PCI-X\n");
- ctrl->speed_capability = PCI_SPEED_133MHz_PCIX;
- break;
- }
- if (bus_cap & 0x40) {
- dbg("bus max supports 100MHz PCI-X\n");
- ctrl->speed_capability = PCI_SPEED_100MHz_PCIX;
- break;
- }
- if (bus_cap & 20) {
- dbg("bus max supports 66MHz PCI-X\n");
- ctrl->speed_capability = PCI_SPEED_66MHz_PCIX;
- break;
- }
- if (bus_cap & 10) {
- dbg("bus max supports 66MHz PCI\n");
- ctrl->speed_capability = PCI_SPEED_66MHz;
- break;
- }
-
- break;
- }
-
- switch (subsystem_deviceid) {
- case PCI_SUB_HPC_ID:
- /* Original 6500/7000 implementation */
- ctrl->slot_switch_type = 1;
- ctrl->speed_capability = PCI_SPEED_33MHz;
- ctrl->push_button = 0;
- ctrl->pci_config_space = 1;
- ctrl->defeature_PHP = 1;
- ctrl->pcix_support = 0;
- ctrl->pcix_speed_capability = 0;
- break;
- case PCI_SUB_HPC_ID2:
- /* First Pushbutton implementation */
- ctrl->push_flag = 1;
- ctrl->slot_switch_type = 1;
- ctrl->speed_capability = PCI_SPEED_33MHz;
- ctrl->push_button = 1;
- ctrl->pci_config_space = 1;
- ctrl->defeature_PHP = 1;
- ctrl->pcix_support = 0;
- ctrl->pcix_speed_capability = 0;
- break;
- case PCI_SUB_HPC_ID_INTC:
- /* Third party (6500/7000) */
- ctrl->slot_switch_type = 1;
- ctrl->speed_capability = PCI_SPEED_33MHz;
- ctrl->push_button = 0;
- ctrl->pci_config_space = 1;
- ctrl->defeature_PHP = 1;
- ctrl->pcix_support = 0;
- ctrl->pcix_speed_capability = 0;
- break;
- case PCI_SUB_HPC_ID3:
- /* First 66 Mhz implementation */
- ctrl->push_flag = 1;
- ctrl->slot_switch_type = 1;
- ctrl->speed_capability = PCI_SPEED_66MHz;
- ctrl->push_button = 1;
- ctrl->pci_config_space = 1;
- ctrl->defeature_PHP = 1;
- ctrl->pcix_support = 0;
- ctrl->pcix_speed_capability = 0;
- break;
- case PCI_SUB_HPC_ID4:
- /* First PCI-X implementation, 100MHz */
- ctrl->push_flag = 1;
- ctrl->slot_switch_type = 1;
- ctrl->speed_capability = PCI_SPEED_100MHz_PCIX;
- ctrl->push_button = 1;
- ctrl->pci_config_space = 1;
- ctrl->defeature_PHP = 1;
- ctrl->pcix_support = 1;
- ctrl->pcix_speed_capability = 0;
- break;
- default:
- err(msg_HPC_not_supported);
- rc = -ENODEV;
- goto err_free_ctrl;
- }
- break;
+ /* Check for push button */
+ if (subsystem_deviceid & 0x0002)
+ ctrl->push_button = 0;
+ else
+ ctrl->push_button = 1;
- case PCI_VENDOR_ID_INTEL:
- /* Check for speed capability (0=33, 1=66) */
- if (subsystem_deviceid & 0x0001) {
- ctrl->speed_capability = PCI_SPEED_66MHz;
- } else {
- ctrl->speed_capability = PCI_SPEED_33MHz;
- }
-
- /* Check for push button */
- if (subsystem_deviceid & 0x0002) {
- /* no push button */
- ctrl->push_button = 0;
- } else {
- /* push button supported */
- ctrl->push_button = 1;
- }
-
- /* Check for slot switch type (0=mechanical, 1=not mechanical) */
- if (subsystem_deviceid & 0x0004) {
- /* no switch */
- ctrl->slot_switch_type = 0;
- } else {
- /* switch */
- ctrl->slot_switch_type = 1;
- }
-
- /* PHP Status (0=De-feature PHP, 1=Normal operation) */
- if (subsystem_deviceid & 0x0008) {
- ctrl->defeature_PHP = 1; /* PHP supported */
- } else {
- ctrl->defeature_PHP = 0; /* PHP not supported */
- }
-
- /* Alternate Base Address Register Interface (0=not supported, 1=supported) */
- if (subsystem_deviceid & 0x0010) {
- ctrl->alternate_base_address = 1; /* supported */
- } else {
- ctrl->alternate_base_address = 0; /* not supported */
- }
-
- /* PCI Config Space Index (0=not supported, 1=supported) */
- if (subsystem_deviceid & 0x0020) {
- ctrl->pci_config_space = 1; /* supported */
- } else {
- ctrl->pci_config_space = 0; /* not supported */
- }
-
- /* PCI-X support */
- if (subsystem_deviceid & 0x0080) {
- /* PCI-X capable */
- ctrl->pcix_support = 1;
- /* Frequency of operation in PCI-X mode */
- if (subsystem_deviceid & 0x0040) {
- /* 133MHz PCI-X if bit 7 is 1 */
- ctrl->pcix_speed_capability = 1;
- } else {
- /* 100MHz PCI-X if bit 7 is 1 and bit 0 is 0, */
- /* 66MHz PCI-X if bit 7 is 1 and bit 0 is 1 */
- ctrl->pcix_speed_capability = 0;
- }
- } else {
- /* Conventional PCI */
- ctrl->pcix_support = 0;
- ctrl->pcix_speed_capability = 0;
- }
- break;
+ /* Check for slot switch type (0=mechanical, 1=not mechanical) */
+ if (subsystem_deviceid & 0x0004)
+ ctrl->slot_switch_type = 0;
+ else
+ ctrl->slot_switch_type = 1;
+
+ /* PHP Status (0=De-feature PHP, 1=Normal operation) */
+ if (subsystem_deviceid & 0x0008)
+ ctrl->defeature_PHP = 1; /* PHP supported */
+ else
+ ctrl->defeature_PHP = 0; /* PHP not supported */
+
+ /* Alternate Base Address Register Interface
+ * (0=not supported, 1=supported)
+ */
+ if (subsystem_deviceid & 0x0010)
+ ctrl->alternate_base_address = 1;
+ else
+ ctrl->alternate_base_address = 0;
- default:
- err(msg_HPC_not_supported);
- rc = -ENODEV;
- goto err_free_ctrl;
+ /* PCI Config Space Index (0=not supported, 1=supported) */
+ if (subsystem_deviceid & 0x0020)
+ ctrl->pci_config_space = 1;
+ else
+ ctrl->pci_config_space = 0;
+
+ /* PCI-X support */
+ if (subsystem_deviceid & 0x0080) {
+ ctrl->pcix_support = 1;
+ if (subsystem_deviceid & 0x0040)
+ /* 133MHz PCI-X if bit 7 is 1 */
+ ctrl->pcix_speed_capability = 1;
+ else
+ /* 100MHz PCI-X if bit 7 is 1 and bit 0 is 0, */
+ /* 66MHz PCI-X if bit 7 is 1 and bit 0 is 1 */
+ ctrl->pcix_speed_capability = 0;
+ } else {
+ /* Conventional PCI */
+ ctrl->pcix_support = 0;
+ ctrl->pcix_speed_capability = 0;
}
+ break;
- } else {
+ default:
err(msg_HPC_not_supported);
- return -ENODEV;
+ rc = -ENODEV;
+ goto err_free_ctrl;
}
/* Tell the user that we found one. */
@@ -1164,7 +1152,7 @@ static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto err_free_mem_region;
}
- // Check for 66Mhz operation
+ /* Check for 66Mhz operation */
ctrl->speed = get_controller_speed(ctrl);
--
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