Messages in this thread Patch in this message | | | From | Shanker Donthineni <> | Subject | [PATCH V6 1/5] irqchip/gicv3-its: Introduce two helper functions for accessing BASERn | Date | Tue, 14 Jun 2016 09:45:15 -0500 |
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This patch adds the two handy helper functions for reading and writing ITS BASERn register.
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- Changes since v5: Marc suggested to fold its_write_baser_cache into its_write_baser.
Changes since v1: baser->val is consistent with hardware register contents.
drivers/irqchip/irq-gic-v3-its.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 5eb1f9e..924f836 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -824,6 +824,22 @@ static const char *its_base_type_string[] = { [GITS_BASER_TYPE_RESERVED7] = "Reserved (7)", }; +static u64 its_read_baser(struct its_node *its, struct its_baser *baser) +{ + u32 idx = baser - its->tables; + + return readq_relaxed(its->base + GITS_BASER + (idx << 3)); +} + +static void its_write_baser(struct its_node *its, struct its_baser *baser, + u64 val) +{ + u32 idx = baser - its->tables; + + writeq_relaxed(val, its->base + GITS_BASER + (idx << 3)); + baser->val = its_read_baser(its, baser); +} + static void its_free_tables(struct its_node *its) { int i; @@ -863,7 +879,8 @@ static int its_alloc_tables(const char *node_name, struct its_node *its) its->device_ids = ids; for (i = 0; i < GITS_BASER_NR_REGS; i++) { - u64 val = readq_relaxed(its->base + GITS_BASER + i * 8); + struct its_baser *baser = its->tables + i; + u64 val = its_read_baser(its, baser); u64 type = GITS_BASER_TYPE(val); u64 entry_size = GITS_BASER_ENTRY_SIZE(val); int order = get_order(psz); @@ -937,10 +954,9 @@ retry_baser: } val |= alloc_pages - 1; - its->tables[i].val = val; - writeq_relaxed(val, its->base + GITS_BASER + i * 8); - tmp = readq_relaxed(its->base + GITS_BASER + i * 8); + its_write_baser(its, baser, val); + tmp = baser->val; if ((val ^ tmp) & GITS_BASER_SHAREABILITY_MASK) { /* -- Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
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