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authorJayachandran C <jchandra@broadcom.com>2015-01-07 16:58:25 +0530
committerRalf Baechle <ralf@linux-mips.org>2015-04-01 17:21:48 +0200
commit72e0605b4346c3b018a5926ab0b3f535ab1f9b82 (patch)
treed3df6d1e256c8480237b5b826ac8dfb852ac032a /arch/mips/netlogic
parent9bbc6c7d35e2b3370e5e447f3d165892882d35a8 (diff)
MIPS: Netlogic: Disable writing IRT for disabled blocks
If the device header of a block is not present, return invalid IRT value so that we do not program an incorrect offset. Signed-off-by: Jayachandran C <jchandra@broadcom.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8882/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/netlogic')
-rw-r--r--arch/mips/netlogic/xlp/nlm_hal.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/arch/mips/netlogic/xlp/nlm_hal.c b/arch/mips/netlogic/xlp/nlm_hal.c
index 7e0d22419e9b..de41fb5dec4c 100644
--- a/arch/mips/netlogic/xlp/nlm_hal.c
+++ b/arch/mips/netlogic/xlp/nlm_hal.c
@@ -170,16 +170,23 @@ static int xlp_irq_to_irt(int irq)
}
if (devoff != 0) {
+ uint32_t val;
+
pcibase = nlm_pcicfg_base(devoff);
- irt = nlm_read_reg(pcibase, XLP_PCI_IRTINFO_REG) & 0xffff;
- /* HW weirdness, I2C IRT entry has to be fixed up */
- switch (irq) {
- case PIC_I2C_1_IRQ:
- irt = irt + 1; break;
- case PIC_I2C_2_IRQ:
- irt = irt + 2; break;
- case PIC_I2C_3_IRQ:
- irt = irt + 3; break;
+ val = nlm_read_reg(pcibase, XLP_PCI_IRTINFO_REG);
+ if (val == 0xffffffff) {
+ irt = -1;
+ } else {
+ irt = val & 0xffff;
+ /* HW weirdness, I2C IRT entry has to be fixed up */
+ switch (irq) {
+ case PIC_I2C_1_IRQ:
+ irt = irt + 1; break;
+ case PIC_I2C_2_IRQ:
+ irt = irt + 2; break;
+ case PIC_I2C_3_IRQ:
+ irt = irt + 3; break;
+ }
}
} else if (irq >= PIC_PCIE_LINK_LEGACY_IRQ(0) &&
irq <= PIC_PCIE_LINK_LEGACY_IRQ(3)) {