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x86_64: implement CalIOC2 TCE cache flush sequence 

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Muli Ben-Yehuda 2007-07-21 17:10:54 +02:00 committed by Linus Torvalds
parent c38601084b
commit 00be3fa42f
1 changed files with 87 additions and 1 deletions
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88
arch/x86_64/kernel/pci-calgary.c
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@ -81,6 +81,8 @@ int use_calgary __read_mostly = 0;
/* CalIOC2 specific */
#define PHB_SAVIOR_L2 0x0DB0
#define PHB_PAGE_MIG_CTRL 0x0DA8
#define PHB_PAGE_MIG_DEBUG 0x0DA0
/* PHB_CONFIG_RW */
#define PHB_TCE_ENABLE 0x20000000
@ -95,6 +97,10 @@ int use_calgary __read_mostly = 0;
#define CSR_AGENT_MASK 0xffe0ffff
/* CCR (Calgary Configuration Register) */
#define CCR_2SEC_TIMEOUT 0x000000000000000EUL
/* PMCR/PMDR (Page Migration Control/Debug Registers */
#define PMR_SOFTSTOP 0x80000000
#define PMR_SOFTSTOPFAULT 0x40000000
#define PMR_HARDSTOP 0x20000000
#define MAX_NUM_OF_PHBS 8 /* how many PHBs in total? */
#define MAX_NUM_CHASSIS 8 /* max number of chassis */
@ -160,6 +166,7 @@ struct calgary_bus_info {
static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
static void calgary_tce_cache_blast(struct iommu_table *tbl);
static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
static void calioc2_tce_cache_blast(struct iommu_table *tbl);
static struct cal_chipset_ops calgary_chip_ops = {
.handle_quirks = calgary_handle_quirks,
@ -168,7 +175,7 @@ static struct cal_chipset_ops calgary_chip_ops = {
static struct cal_chipset_ops calioc2_chip_ops = {
.handle_quirks = calioc2_handle_quirks,
.tce_cache_blast = NULL
.tce_cache_blast = calioc2_tce_cache_blast
};
static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
@ -637,6 +644,85 @@ static void calgary_tce_cache_blast(struct iommu_table *tbl)
(void)readl(target); /* flush */
}
static void calioc2_tce_cache_blast(struct iommu_table *tbl)
{
void __iomem *bbar = tbl->bbar;
void __iomem *target;
u64 val64;
u32 val;
int i = 0;
int count = 1;
unsigned char bus = tbl->it_busno;
begin:
printk(KERN_DEBUG "Calgary: CalIOC2 bus 0x%x entering tce cache blast "
"sequence - count %d\n", bus, count);
/* 1. using the Page Migration Control reg set SoftStop */
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "1a. read 0x%x [LE] from %p\n", val, target);
val |= PMR_SOFTSTOP;
printk(KERN_DEBUG "1b. writing 0x%x [LE] to %p\n", val, target);
writel(cpu_to_be32(val), target);
/* 2. poll split queues until all DMA activity is done */
printk(KERN_DEBUG "2a. starting to poll split queues\n");
target = calgary_reg(bbar, split_queue_offset(bus));
do {
val64 = readq(target);
i++;
} while ((val64 & 0xff) != 0xff && i < 100);
if (i == 100)
printk(KERN_WARNING "CalIOC2: PCI bus not quiesced, "
"continuing anyway\n");
/* 3. poll Page Migration DEBUG for SoftStopFault */
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "3. read 0x%x [LE] from %p\n", val, target);
/* 4. if SoftStopFault - goto (1) */
if (val & PMR_SOFTSTOPFAULT) {
if (++count < 100)
goto begin;
else {
printk(KERN_WARNING "CalIOC2: too many SoftStopFaults, "
"aborting TCE cache flush sequence!\n");
return; /* pray for the best */
}
}
/* 5. Slam into HardStop by reading PHB_PAGE_MIG_CTRL */
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
printk(KERN_DEBUG "5a. slamming into HardStop by reading %p\n", target);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "5b. read 0x%x [LE] from %p\n", val, target);
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "5c. read 0x%x [LE] from %p (debug)\n", val, target);
/* 6. invalidate TCE cache */
printk(KERN_DEBUG "6. invalidating TCE cache\n");
target = calgary_reg(bbar, tar_offset(bus));
writeq(tbl->tar_val, target);
/* 7. Re-read PMCR */
printk(KERN_DEBUG "7a. Re-reading PMCR\n");
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "7b. read 0x%x [LE] from %p\n", val, target);
/* 8. Remove HardStop */
printk(KERN_DEBUG "8a. removing HardStop from PMCR\n");
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
val = 0;
printk(KERN_DEBUG "8b. writing 0x%x [LE] to %p\n", val, target);
writel(cpu_to_be32(val), target);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "8c. read 0x%x [LE] from %p\n", val, target);
}
static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
u64 limit)
{