summaryrefslogtreecommitdiff
path: root/arch/x86_64/kernel/pci-calgary.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86_64/kernel/pci-calgary.c')
-rw-r--r--arch/x86_64/kernel/pci-calgary.c80
1 files changed, 67 insertions, 13 deletions
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index f760045d6d35..37a770859e71 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -2,8 +2,9 @@
* Derived from arch/powerpc/kernel/iommu.c
*
* Copyright (C) IBM Corporation, 2006
+ * Copyright (C) 2006 Jon Mason <jdmason@kudzu.us>
*
- * Author: Jon Mason <jdmason@us.ibm.com>
+ * Author: Jon Mason <jdmason@kudzu.us>
* Author: Muli Ben-Yehuda <muli@il.ibm.com>
* This program is free software; you can redistribute it and/or modify
@@ -51,7 +52,8 @@
#define ONE_BASED_CHASSIS_NUM 1
/* register offsets inside the host bridge space */
-#define PHB_CSR_OFFSET 0x0110
+#define CALGARY_CONFIG_REG 0x0108
+#define PHB_CSR_OFFSET 0x0110 /* Channel Status */
#define PHB_PLSSR_OFFSET 0x0120
#define PHB_CONFIG_RW_OFFSET 0x0160
#define PHB_IOBASE_BAR_LOW 0x0170
@@ -82,6 +84,8 @@
#define TAR_VALID 0x0000000000000008UL
/* CSR (Channel/DMA Status Register) */
#define CSR_AGENT_MASK 0xffe0ffff
+/* CCR (Calgary Configuration Register) */
+#define CCR_2SEC_TIMEOUT 0x000000000000000EUL
#define MAX_NUM_OF_PHBS 8 /* how many PHBs in total? */
#define MAX_NUM_CHASSIS 8 /* max number of chassis */
@@ -714,7 +718,7 @@ static void calgary_watchdog(unsigned long data)
/* If no error, the agent ID in the CSR is not valid */
if (val32 & CSR_AGENT_MASK) {
- printk(KERN_EMERG "calgary_watchdog: DMA error on bus %d, "
+ printk(KERN_EMERG "calgary_watchdog: DMA error on PHB %#x, "
"CSR = %#x\n", dev->bus->number, val32);
writel(0, target);
@@ -731,6 +735,38 @@ static void calgary_watchdog(unsigned long data)
}
}
+static void __init calgary_increase_split_completion_timeout(void __iomem *bbar,
+ unsigned char busnum)
+{
+ u64 val64;
+ void __iomem *target;
+ unsigned long phb_shift = -1;
+ u64 mask;
+
+ switch (busno_to_phbid(busnum)) {
+ case 0: phb_shift = (63 - 19);
+ break;
+ case 1: phb_shift = (63 - 23);
+ break;
+ case 2: phb_shift = (63 - 27);
+ break;
+ case 3: phb_shift = (63 - 35);
+ break;
+ default:
+ BUG_ON(busno_to_phbid(busnum));
+ }
+
+ target = calgary_reg(bbar, CALGARY_CONFIG_REG);
+ val64 = be64_to_cpu(readq(target));
+
+ /* zero out this PHB's timer bits */
+ mask = ~(0xFUL << phb_shift);
+ val64 &= mask;
+ val64 |= (CCR_2SEC_TIMEOUT << phb_shift);
+ writeq(cpu_to_be64(val64), target);
+ readq(target); /* flush */
+}
+
static void __init calgary_enable_translation(struct pci_dev *dev)
{
u32 val32;
@@ -748,13 +784,20 @@ static void __init calgary_enable_translation(struct pci_dev *dev)
val32 = be32_to_cpu(readl(target));
val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
- printk(KERN_INFO "Calgary: enabling translation on PHB %d\n", busnum);
+ printk(KERN_INFO "Calgary: enabling translation on PHB %#x\n", busnum);
printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
"bus.\n");
writel(cpu_to_be32(val32), target);
readl(target); /* flush */
+ /*
+ * Give split completion a longer timeout on bus 1 for aic94xx
+ * http://bugzilla.kernel.org/show_bug.cgi?id=7180
+ */
+ if (busnum == 1)
+ calgary_increase_split_completion_timeout(bbar, busnum);
+
init_timer(&tbl->watchdog_timer);
tbl->watchdog_timer.function = &calgary_watchdog;
tbl->watchdog_timer.data = (unsigned long)dev;
@@ -778,7 +821,7 @@ static void __init calgary_disable_translation(struct pci_dev *dev)
val32 = be32_to_cpu(readl(target));
val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
- printk(KERN_INFO "Calgary: disabling translation on PHB %d!\n", busnum);
+ printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
writel(cpu_to_be32(val32), target);
readl(target); /* flush */
@@ -790,7 +833,16 @@ static inline unsigned int __init locate_register_space(struct pci_dev *dev)
int rionodeid;
u32 address;
- rionodeid = (dev->bus->number % 15 > 4) ? 3 : 2;
+ /*
+ * Each Calgary has four busses. The first four busses (first Calgary)
+ * have RIO node ID 2, then the next four (second Calgary) have RIO
+ * node ID 3, the next four (third Calgary) have node ID 2 again, etc.
+ * We use a gross hack - relying on the dev->bus->number ordering,
+ * modulo 14 - to decide which Calgary a given bus is on. Busses 0, 1,
+ * 2 and 4 are on the first Calgary (id 2), 6, 8, a and c are on the
+ * second (id 3), and then it repeats modulo 14.
+ */
+ rionodeid = (dev->bus->number % 14 > 4) ? 3 : 2;
/*
* register space address calculation as follows:
* FE0MB-8MB*OneBasedChassisNumber+1MB*(RioNodeId-ChassisBase)
@@ -798,7 +850,7 @@ static inline unsigned int __init locate_register_space(struct pci_dev *dev)
* RioNodeId is 2 for first Calgary, 3 for second Calgary
*/
address = START_ADDRESS -
- (0x800000 * (ONE_BASED_CHASSIS_NUM + dev->bus->number / 15)) +
+ (0x800000 * (ONE_BASED_CHASSIS_NUM + dev->bus->number / 14)) +
(0x100000) * (rionodeid - CHASSIS_BASE);
return address;
}
@@ -816,6 +868,8 @@ static int __init calgary_init_one(struct pci_dev *dev)
void __iomem *bbar;
int ret;
+ BUG_ON(dev->bus->number >= MAX_PHB_BUS_NUM);
+
address = locate_register_space(dev);
/* map entire 1MB of Calgary config space */
bbar = ioremap_nocache(address, 1024 * 1024);
@@ -842,10 +896,10 @@ done:
static int __init calgary_init(void)
{
- int i, ret = -ENODEV;
+ int ret = -ENODEV;
struct pci_dev *dev = NULL;
- for (i = 0; i < MAX_PHB_BUS_NUM; i++) {
+ do {
dev = pci_get_device(PCI_VENDOR_ID_IBM,
PCI_DEVICE_ID_IBM_CALGARY,
dev);
@@ -861,12 +915,12 @@ static int __init calgary_init(void)
ret = calgary_init_one(dev);
if (ret)
goto error;
- }
+ } while (1);
return ret;
error:
- for (i--; i >= 0; i--) {
+ do {
dev = pci_find_device_reverse(PCI_VENDOR_ID_IBM,
PCI_DEVICE_ID_IBM_CALGARY,
dev);
@@ -882,7 +936,7 @@ error:
calgary_disable_translation(dev);
calgary_free_bus(dev);
pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
- }
+ } while (1);
return ret;
}
@@ -1052,7 +1106,7 @@ static int __init calgary_parse_options(char *p)
if (bridge < MAX_PHB_BUS_NUM) {
printk(KERN_INFO "Calgary: disabling "
- "translation for PHB 0x%x\n", bridge);
+ "translation for PHB %#x\n", bridge);
bus_info[bridge].translation_disabled = 1;
}
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-26 16:19:12 +0000