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irqchip/gicv3-its: Workaround for Cavium ThunderX errata 22375, 24313

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This implements two gicv3-its errata workarounds for ThunderX. Both
with small impact affecting only ITS table allocation.

 erratum 22375: only alloc 8MB table size
 erratum 24313: ignore memory access type

The fixes are in ITS initialization and basically ignore memory access
type and table size provided by the TYPER and BASER registers.

Signed-off-by: Ganapatrao Kulkarni <[email protected]>
Signed-off-by: Robert Richter <[email protected]>
Reviewed-by: Marc Zygnier <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Cc: Tirumalesh Chalamarla <[email protected]>
Cc: [email protected]
Cc: Jason Cooper <[email protected]>
Cc: Will Deacon <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Robert Richter 2015-09-21 22:58:38 +02:00 • committed by Thomas Gleixner
commit 9410097074
2 changed files with 50 additions and 4 deletions
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37
drivers/irqchip/irq-gic-v3-its.c
View file

@ -39,7 +39,8 @@
#include "irq-gic-common.h"
#define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1 << 0)
#define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0)
#define ITS_FLAGS_WORKAROUND_CAVIUM_22375 (1ULL << 1)
#define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0)
@ -816,9 +817,22 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
int i;
int psz = SZ_64K;
u64 shr = GITS_BASER_InnerShareable;
u64 cache = GITS_BASER_WaWb;
u64 typer = readq_relaxed(its->base + GITS_TYPER);
u32 ids = GITS_TYPER_DEVBITS(typer);
u64 cache;
u64 typer;
u32 ids;
if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_22375) {
/*
* erratum 22375: only alloc 8MB table size
* erratum 24313: ignore memory access type
*/
cache = 0;
ids = 0x14; /* 20 bits, 8MB */
} else {
cache = GITS_BASER_WaWb;
typer = readq_relaxed(its->base + GITS_TYPER);
ids = GITS_TYPER_DEVBITS(typer);
}
for (i = 0; i < GITS_BASER_NR_REGS; i++) {
u64 val = readq_relaxed(its->base + GITS_BASER + i * 8);
@ -1377,7 +1391,22 @@ static int its_force_quiescent(void __iomem *base)
}
}
static void __maybe_unused its_enable_quirk_cavium_22375(void *data)
{
struct its_node *its = data;
its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_22375;
}
static const struct gic_quirk its_quirks[] = {
#ifdef CONFIG_CAVIUM_ERRATUM_22375
{
.desc = "ITS: Cavium errata 22375, 24313",
.iidr = 0xa100034c, /* ThunderX pass 1.x */
.mask = 0xffff0fff,
.init = its_enable_quirk_cavium_22375,
},
#endif
{
}
};