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authorKeck, David <david.keck@amd.com>2006-01-17 00:22:36 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2006-02-01 05:00:12 +0300
commit53044f357448693f218cc4f053affe92ed414f9d (patch)
treedabb2a73762270027d72828a055ba1dd243860af /drivers/pci
parent3c0c6441883be7676b795939e268b90d6acab360 (diff)
downloadlinux-53044f357448693f218cc4f053affe92ed414f9d.tar.xz
[PATCH] PCI Hotplug: shpchp: AMD POGO errata fix
This patch fixes the AMD POGO errata on the hotplug controller where the platform will lock up or reboot if PERR/SERR generation is enabled and a slot is sent an enable command. This fix disables PERR/SERR generation before a slot is sent the enable command by first saving related registers, turning off SERR/PERR generation, enabling the slot, then restoring the registers. Signed-off-by: David Keck <david.keck@amd.com> Cc: Kristen Accardi <kristen.c.accardi@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/hotplug/shpchp.h94
-rw-r--r--drivers/pci/hotplug/shpchp_ctrl.c12
2 files changed, 105 insertions, 1 deletions
diff --git a/drivers/pci/hotplug/shpchp.h b/drivers/pci/hotplug/shpchp.h
index ce0e9b6ce833..7d6f521d02ea 100644
--- a/drivers/pci/hotplug/shpchp.h
+++ b/drivers/pci/hotplug/shpchp.h
@@ -95,6 +95,7 @@ struct controller {
u8 function;
u8 slot_device_offset;
u8 add_support;
+ u32 pcix_misc2_reg; /* for amd pogo errata */
enum pci_bus_speed speed;
u32 first_slot; /* First physical slot number */
u8 slot_bus; /* Bus where the slots handled by this controller sit */
@@ -113,6 +114,26 @@ struct hotplug_params {
/* Define AMD SHPC ID */
#define PCI_DEVICE_ID_AMD_GOLAM_7450 0x7450
+#define PCI_DEVICE_ID_AMD_POGO_7458 0x7458
+
+/* AMD PCIX bridge registers */
+
+#define PCIX_MEM_BASE_LIMIT_OFFSET 0x1C
+#define PCIX_MISCII_OFFSET 0x48
+#define PCIX_MISC_BRIDGE_ERRORS_OFFSET 0x80
+
+/* AMD PCIX_MISCII masks and offsets */
+#define PERRNONFATALENABLE_MASK 0x00040000
+#define PERRFATALENABLE_MASK 0x00080000
+#define PERRFLOODENABLE_MASK 0x00100000
+#define SERRNONFATALENABLE_MASK 0x00200000
+#define SERRFATALENABLE_MASK 0x00400000
+
+/* AMD PCIX_MISC_BRIDGE_ERRORS masks and offsets */
+#define PERR_OBSERVED_MASK 0x00000001
+
+/* AMD PCIX_MEM_BASE_LIMIT masks */
+#define RSE_MASK 0x40000000
#define INT_BUTTON_IGNORE 0
#define INT_PRESENCE_ON 1
@@ -333,6 +354,79 @@ static inline int wait_for_ctrl_irq (struct controller *ctrl)
return retval;
}
+static inline void amd_pogo_errata_save_misc_reg(struct slot *p_slot)
+{
+ u32 pcix_misc2_temp;
+
+ /* save MiscII register */
+ pci_read_config_dword(p_slot->ctrl->pci_dev, PCIX_MISCII_OFFSET, &pcix_misc2_temp);
+
+ p_slot->ctrl->pcix_misc2_reg = pcix_misc2_temp;
+
+ /* clear SERR/PERR enable bits */
+ pcix_misc2_temp &= ~SERRFATALENABLE_MASK;
+ pcix_misc2_temp &= ~SERRNONFATALENABLE_MASK;
+ pcix_misc2_temp &= ~PERRFLOODENABLE_MASK;
+ pcix_misc2_temp &= ~PERRFATALENABLE_MASK;
+ pcix_misc2_temp &= ~PERRNONFATALENABLE_MASK;
+ pci_write_config_dword(p_slot->ctrl->pci_dev, PCIX_MISCII_OFFSET, pcix_misc2_temp);
+}
+
+static inline void amd_pogo_errata_restore_misc_reg(struct slot *p_slot)
+{
+ u32 pcix_misc2_temp;
+ u32 pcix_bridge_errors_reg;
+ u32 pcix_mem_base_reg;
+ u8 perr_set;
+ u8 rse_set;
+
+ /* write-one-to-clear Bridge_Errors[ PERR_OBSERVED ] */
+ pci_read_config_dword(p_slot->ctrl->pci_dev, PCIX_MISC_BRIDGE_ERRORS_OFFSET, &pcix_bridge_errors_reg);
+ perr_set = pcix_bridge_errors_reg & PERR_OBSERVED_MASK;
+ if (perr_set) {
+ dbg ("%s W1C: Bridge_Errors[ PERR_OBSERVED = %08X]\n",__FUNCTION__ , perr_set);
+
+ pci_write_config_dword(p_slot->ctrl->pci_dev, PCIX_MISC_BRIDGE_ERRORS_OFFSET, perr_set);
+ }
+
+ /* write-one-to-clear Memory_Base_Limit[ RSE ] */
+ pci_read_config_dword(p_slot->ctrl->pci_dev, PCIX_MEM_BASE_LIMIT_OFFSET, &pcix_mem_base_reg);
+ rse_set = pcix_mem_base_reg & RSE_MASK;
+ if (rse_set) {
+ dbg ("%s W1C: Memory_Base_Limit[ RSE ]\n",__FUNCTION__ );
+
+ pci_write_config_dword(p_slot->ctrl->pci_dev, PCIX_MEM_BASE_LIMIT_OFFSET, rse_set);
+ }
+ /* restore MiscII register */
+ pci_read_config_dword( p_slot->ctrl->pci_dev, PCIX_MISCII_OFFSET, &pcix_misc2_temp );
+
+ if (p_slot->ctrl->pcix_misc2_reg & SERRFATALENABLE_MASK)
+ pcix_misc2_temp |= SERRFATALENABLE_MASK;
+ else
+ pcix_misc2_temp &= ~SERRFATALENABLE_MASK;
+
+ if (p_slot->ctrl->pcix_misc2_reg & SERRNONFATALENABLE_MASK)
+ pcix_misc2_temp |= SERRNONFATALENABLE_MASK;
+ else
+ pcix_misc2_temp &= ~SERRNONFATALENABLE_MASK;
+
+ if (p_slot->ctrl->pcix_misc2_reg & PERRFLOODENABLE_MASK)
+ pcix_misc2_temp |= PERRFLOODENABLE_MASK;
+ else
+ pcix_misc2_temp &= ~PERRFLOODENABLE_MASK;
+
+ if (p_slot->ctrl->pcix_misc2_reg & PERRFATALENABLE_MASK)
+ pcix_misc2_temp |= PERRFATALENABLE_MASK;
+ else
+ pcix_misc2_temp &= ~PERRFATALENABLE_MASK;
+
+ if (p_slot->ctrl->pcix_misc2_reg & PERRNONFATALENABLE_MASK)
+ pcix_misc2_temp |= PERRNONFATALENABLE_MASK;
+ else
+ pcix_misc2_temp &= ~PERRNONFATALENABLE_MASK;
+ pci_write_config_dword(p_slot->ctrl->pci_dev, PCIX_MISCII_OFFSET, pcix_misc2_temp);
+}
+
#define SLOT_NAME_SIZE 10
static inline void make_slot_name(char *buffer, int buffer_size, struct slot *slot)
diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c
index 25ccb0e47593..643252d9bf3b 100644
--- a/drivers/pci/hotplug/shpchp_ctrl.c
+++ b/drivers/pci/hotplug/shpchp_ctrl.c
@@ -894,7 +894,17 @@ int shpchp_enable_slot (struct slot *p_slot)
dbg("%s: p_slot->pwr_save %x\n", __FUNCTION__, p_slot->pwr_save);
p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
- rc = board_added(p_slot);
+ if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
+ (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
+ && p_slot->ctrl->num_slots == 1) {
+ /* handle amd pogo errata; this must be done before enable */
+ amd_pogo_errata_save_misc_reg(p_slot);
+ rc = board_added(p_slot);
+ /* handle amd pogo errata; this must be done after enable */
+ amd_pogo_errata_restore_misc_reg(p_slot);
+ } else
+ rc = board_added(p_slot);
+
if (rc) {
p_slot->hpc_ops->get_adapter_status(p_slot,
&(p_slot->presence_save));