Parse the ITS TYPER and populates the associate its_data field.
Some of the info are needed for command handling, typically the
PTA bit which reports the target address encoding type.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
lib/arm/asm/gic-v3-its.h | 23 +++++++++++++++++++++++
lib/arm/gic-v3-its.c | 26 ++++++++++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h
index 3e36a2a..353db6f 100644
--- a/lib/arm/asm/gic-v3-its.h
+++ b/lib/arm/asm/gic-v3-its.h
@@ -33,11 +33,19 @@
#define GICR_PROPBASER_InnerShareable \
GIC_BASER_SHAREABILITY(GICR_PROPBASER, InnerShareable)
+#define GITS_TYPER 0x0008
#define GITS_CBASER 0x0080
#define GITS_CWRITER 0x0088
#define GITS_CREADR 0x0090
#define GITS_BASER 0x0100
+#define GITS_TYPER_PLPIS (1UL << 0)
+#define GITS_TYPER_IDBITS_SHIFT 8
+#define GITS_TYPER_DEVBITS_SHIFT 13
+#define GITS_TYPER_DEVBITS(r) ((((r) >> GITS_TYPER_DEVBITS_SHIFT) & 0x1f) + 1)
+#define GITS_TYPER_PTA (1UL << 19)
+#define GITS_TYPER_HWCOLLCNT_SHIFT 24
+
#define GITS_CBASER_VALID (1UL << 63)
#define GITS_CBASER_SHAREABILITY_SHIFT (10)
#define GITS_CBASER_INNER_CACHEABILITY_SHIFT (59)
@@ -130,12 +138,26 @@ struct its_cmd_block {
u64 raw_cmd[4];
};
+struct its_typer {
+ unsigned int ite_size;
+ unsigned int event_id_bits;
+ unsigned int device_id_bits;
+ unsigned int collection_id_bits;
+ unsigned int hardware_collectionc_count;
+ bool pta;
+ bool cil;
+ bool cct;
+ bool phys_lpi;
+ bool virt_lpi;
+};
+
struct its_data {
void *base;
struct its_cmd_block *cmd_base;
struct its_cmd_block *cmd_write;
struct its_cmd_block *cmd_readr;
struct its_baser baser[GITS_BASER_NR_REGS];
+ struct its_typer typer;
u64 flags;
};
@@ -143,6 +165,7 @@ extern struct its_data its_data;
#define gicv3_its_base() (its_data.base)
+extern void its_parse_typer(void);
extern int its_parse_baser(int i, struct its_baser *baser);
extern void its_setup_baser(int i, struct its_baser *baser);
extern void enable_lpi(u32 redist);
diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c
index 7c768a5..c8ffa53 100644
--- a/lib/arm/gic-v3-its.c
+++ b/lib/arm/gic-v3-its.c
@@ -17,6 +17,32 @@ static const char * const its_base_type_string[] = {
[GITS_BASER_TYPE_RESERVED7] = "Reserved (7)",
};
+void its_parse_typer(void)
+{
+ u64 typer;
+
+ typer = gicv3_read_typer(gicv3_its_base() + GITS_TYPER);
+
+ its_data.typer.ite_size = ((typer >> 4) & 0xf) + 1;
+ its_data.typer.pta = typer & GITS_TYPER_PTA;
+ its_data.typer.event_id_bits =
+ ((typer >> GITS_TYPER_IDBITS_SHIFT) & 0x1f) + 1;
+ its_data.typer.device_id_bits = GITS_TYPER_DEVBITS(typer)+1;
+
+ its_data.typer.cil = (typer >> 36) & 0x1;
+ if (its_data.typer.cil)
+ its_data.typer.collection_id_bits = ((typer >> 32) & 0xf) + 1;
+ else
+ its_data.typer.collection_id_bits = 16;
+
+ its_data.typer.hardware_collectionc_count =
+ (typer >> GITS_TYPER_HWCOLLCNT_SHIFT) & 0xff;
+
+ its_data.typer.cct = typer & 0x4;
+ its_data.typer.virt_lpi = typer & 0x2;
+ its_data.typer.phys_lpi = typer & GITS_TYPER_PLPIS;
+}
+
int its_parse_baser(int i, struct its_baser *baser)
{
void *reg_addr = gicv3_its_base() + GITS_BASER + i * 8;
--
2.5.5
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