From patchwork Sun May 10 20:33:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Glass X-Patchwork-Id: 245506 List-Id: U-Boot discussion From: sjg at chromium.org (Simon Glass) Date: Sun, 10 May 2020 14:33:57 -0600 Subject: [PATCH v2 23/35] acpi: Add support for writing a Power Resource In-Reply-To: <20200510203409.203520-1-sjg@chromium.org> References: <20200510203409.203520-1-sjg@chromium.org> Message-ID: <20200510203409.203520-21-sjg@chromium.org> These are used in ACPI to disable power to various pats of the system when in sleep. Add a way to create a power resource, with the caller finishing off the details. Signed-off-by: Simon Glass --- Changes in v2: None Changes in v1: None include/acpi/acpigen.h | 22 ++++++++++++++++++++++ lib/acpi/acpigen.c | 22 ++++++++++++++++++++++ test/dm/acpigen.c | 41 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 85 insertions(+) diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h index c595bb9efa..7d9a02805b 100644 --- a/include/acpi/acpigen.h +++ b/include/acpi/acpigen.h @@ -45,6 +45,7 @@ enum { AND_OP = 0x7b, OR_OP = 0x7d, NOT_OP = 0x80, + POWER_RES_OP = 0x84, RETURN_OP = 0xa4, }; @@ -310,4 +311,25 @@ void acpigen_write_and(struct acpi_ctx *ctx, u8 arg1, u8 arg2, u8 res); */ void acpigen_write_not(struct acpi_ctx *ctx, u8 arg, u8 res); +/** + * acpigen_write_power_res() - Write a power resource + * + * Name (_PRx, Package(One) { name }) + * ... + * PowerResource (name, level, order) + * + * The caller should fill in the rest of the power resource and then call + * acpigen_pop_len() to close it off + * + * @ctx: ACPI context pointer + * @name: Name of power resource (e.g. "PRIC") + * @level: Deepest sleep level that this resource must be kept on (0=S0, 3=S3) + * @order: Order that this must be enabled/disabled (e.g. 0) + * @dev_stats: List of states to define, e.g. {"_PR0", "_PR3"} + * @dev_states_count: Number of dev states + */ +void acpigen_write_power_res(struct acpi_ctx *ctx, const char *name, uint level, + uint order, const char *const dev_states[], + size_t dev_states_count); + #endif diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c index 57b295aa4e..824a2c97cd 100644 --- a/lib/acpi/acpigen.c +++ b/lib/acpi/acpigen.c @@ -328,6 +328,28 @@ int acpigen_write_uuid(struct acpi_ctx *ctx, const char *uuid) return 0; } +void acpigen_write_power_res(struct acpi_ctx *ctx, const char *name, uint level, + uint order, const char *const dev_states[], + size_t dev_states_count) +{ + size_t i; + + for (i = 0; i < dev_states_count; i++) { + acpigen_write_name(ctx, dev_states[i]); + acpigen_write_package(ctx, 1); + acpigen_emit_simple_namestring(ctx, name); + acpigen_pop_len(ctx); /* Package */ + } + + acpigen_emit_ext_op(ctx, POWER_RES_OP); + + acpigen_write_len_f(ctx); + + acpigen_emit_simple_namestring(ctx, name); + acpigen_emit_byte(ctx, level); + acpigen_emit_word(ctx, order); +} + /* Sleep (ms) */ void acpigen_write_sleep(struct acpi_ctx *ctx, u64 sleep_ms) { diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c index e059d6f80d..c92f6cdb0b 100644 --- a/test/dm/acpigen.c +++ b/test/dm/acpigen.c @@ -696,3 +696,44 @@ static int dm_test_acpi_misc(struct unit_test_state *uts) return 0; } DM_TEST(dm_test_acpi_misc, 0); + +/* Test writing an ACPI power resource */ +static int dm_test_acpi_power_res(struct unit_test_state *uts) +{ + const char *const states[] = { "_PR0", "_PR3" }; + const char *name = "PRIC"; + const int level = 3; + const int order = 2; + struct acpi_ctx *ctx; + u8 *ptr; + + ut_assertok(alloc_context(&ctx)); + + ptr = acpigen_get_current(ctx); + + /* PowerResource (PRIC, 0, 0) */ + acpigen_write_power_res(ctx, name, level, order, states, + ARRAY_SIZE(states)); + ut_asserteq(0x28, acpigen_get_current(ctx) - ptr); + ut_asserteq(NAME_OP, ptr[0]); + ut_asserteq_strn(states[0], (char *)ptr + 1); + ut_asserteq(8, get_length(ptr + 6)); + ut_asserteq_strn(name, (char *)ptr + 0xa); + + ut_asserteq_strn(states[1], (char *)ptr + 0xf); + ut_asserteq(8, get_length(ptr + 0x14)); + ut_asserteq_strn(name, (char *)ptr + 0x18); + + ut_asserteq(POWER_RES_OP, ptr[0x1d]); + ut_asserteq_strn(name, (char *)ptr + 0x21); + ut_asserteq(level, ptr[0x25]); + ut_asserteq(order, get_unaligned((u16 *)(ptr + 0x26))); + + /* The length is not set - caller must use acpigen_pop_len() */ + ut_asserteq(1, ctx->ltop); + + free_context(&ctx); + + return 0; +} +DM_TEST(dm_test_acpi_power_res, 0);