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authorchenhui zhao <chenhui.zhao@freescale.com>2016-01-15 12:38:20 +0300
committerScott Wood <oss@buserror.net>2016-05-16 03:18:48 +0300
commita8165d421dabd476d811f89942e345827f7b1497 (patch)
tree8bec598aefbc1bebb263a11c9a8fdb8dc7071070 /arch/powerpc/sysdev
parent6a369fa28509c3b6a35db979d6fa97a075b94876 (diff)
downloadlinux-a8165d421dabd476d811f89942e345827f7b1497.tar.xz
powerpc/fsl-pci: Add a workaround for PCI 5 errata
Issue: As a master, the PCI IP block can combine a memory write to the last PCI double word (4 bytes) of a cacheline with a 4 byte memory write to the first PCI double word of the subsequent cacheline. This affects 32-bit PCI target devices that blindly assert STOP on memory-write transactions, without detecting that the data beat being transferred is the last data beat of the transaction. It can cause a hang. PCI-X operation is not affected by this erratum. Workaround: Setting the bit MDS in the PCI Bus Function Register will disable the combining of crossing cacheline boundary requests into one burst transaction. Therefore, it can prevent the errata scenario from occurring. This errata exists in MPC8543, MPC8543E, MPC8545, MPC8545E, MPC8547, MPC8547E, MPC8548 and MPC8548E. Refer to PCI 5 in MPC8548 errata document. Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com> Signed-off-by: Zhiqiang Hou <Zhiqiang.Hou@freescale.com> [scottwood: whitespace fix] Signed-off-by: Scott Wood <oss@buserror.net>
Diffstat (limited to 'arch/powerpc/sysdev')
-rw-r--r--arch/powerpc/sysdev/fsl_pci.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 85729f49764f..0ef9df49f0f2 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -37,6 +37,7 @@
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/machdep.h>
+#include <asm/mpc85xx.h>
#include <asm/disassemble.h>
#include <asm/ppc-opcode.h>
#include <sysdev/fsl_soc.h>
@@ -527,6 +528,8 @@ int fsl_add_bridge(struct platform_device *pdev, int is_primary)
u8 hdr_type, progif;
struct device_node *dev;
struct ccsr_pci __iomem *pci;
+ u16 temp;
+ u32 svr = mfspr(SPRN_SVR);
dev = pdev->dev.of_node;
@@ -596,6 +599,27 @@ int fsl_add_bridge(struct platform_device *pdev, int is_primary)
PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS;
if (fsl_pcie_check_link(hose))
hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK;
+ } else {
+ /*
+ * Set PBFR(PCI Bus Function Register)[10] = 1 to
+ * disable the combining of crossing cacheline
+ * boundary requests into one burst transaction.
+ * PCI-X operation is not affected.
+ * Fix erratum PCI 5 on MPC8548
+ */
+#define PCI_BUS_FUNCTION 0x44
+#define PCI_BUS_FUNCTION_MDS 0x400 /* Master disable streaming */
+ if (((SVR_SOC_VER(svr) == SVR_8543) ||
+ (SVR_SOC_VER(svr) == SVR_8545) ||
+ (SVR_SOC_VER(svr) == SVR_8547) ||
+ (SVR_SOC_VER(svr) == SVR_8548)) &&
+ !early_find_capability(hose, 0, 0, PCI_CAP_ID_PCIX)) {
+ early_read_config_word(hose, 0, 0,
+ PCI_BUS_FUNCTION, &temp);
+ temp |= PCI_BUS_FUNCTION_MDS;
+ early_write_config_word(hose, 0, 0,
+ PCI_BUS_FUNCTION, temp);
+ }
}
printk(KERN_INFO "Found FSL PCI host bridge at 0x%016llx. "