From ef48a8ce411a93bd610776ee83164efc973f8094 Mon Sep 17 00:00:00 2001 From: Corey Minyard Date: Tue, 9 Jun 2015 15:12:35 -0500 Subject: [PATCH] acpi: Add i2c serial bus CRS handling This will be required for getting IPMI SSIF (SMBus interface) into the ACPI tables. Cc: Michael S. Tsirkin Cc: Igor Mammedov Signed-off-by: Corey Minyard --- hw/acpi/aml-build.c | 40 ++++++++++++++++++++++++++++++++++++++++ include/hw/acpi/aml-build.h | 18 ++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c index 78aee1a2f9..2c3702b882 100644 --- a/hw/acpi/aml-build.c +++ b/hw/acpi/aml-build.c @@ -1874,3 +1874,43 @@ build_hdr: build_header(linker, tbl, (void *)(tbl->data + fadt_start), "FACP", tbl->len - fadt_start, f->rev, oem_id, oem_table_id); } + +/* ACPI 5.0: 6.4.3.8.2 Serial Bus Connection Descriptors */ +static Aml *aml_serial_bus_device(uint8_t serial_bus_type, uint8_t flags, + uint16_t type_flags, + uint8_t revid, uint16_t data_length, + uint16_t resource_source_len) +{ + Aml *var = aml_alloc(); + uint16_t length = data_length + resource_source_len + 9; + + build_append_byte(var->buf, 0x8e); /* Serial Bus Connection Descriptor */ + build_append_int_noprefix(var->buf, length, sizeof(length)); + build_append_byte(var->buf, 1); /* Revision ID */ + build_append_byte(var->buf, 0); /* Resource Source Index */ + build_append_byte(var->buf, serial_bus_type); /* Serial Bus Type */ + build_append_byte(var->buf, flags); /* General Flags */ + build_append_int_noprefix(var->buf, type_flags, /* Type Specific Flags */ + sizeof(type_flags)); + build_append_byte(var->buf, revid); /* Type Specification Revision ID */ + build_append_int_noprefix(var->buf, data_length, sizeof(data_length)); + + return var; +} + +/* ACPI 5.0: 6.4.3.8.2.1 I2C Serial Bus Connection Resource Descriptor */ +Aml *aml_i2c_serial_bus_device(uint16_t address, const char *resource_source) +{ + uint16_t resource_source_len = strlen(resource_source) + 1; + Aml *var = aml_serial_bus_device(AML_SERIAL_BUS_TYPE_I2C, 0, 0, 1, + 6, resource_source_len); + + /* Connection Speed. Just set to 100K for now, it doesn't really matter. */ + build_append_int_noprefix(var->buf, 100000, 4); + build_append_int_noprefix(var->buf, address, sizeof(address)); + + /* This is a string, not a name, so just copy it directly in. */ + g_array_append_vals(var->buf, resource_source, resource_source_len); + + return var; +} diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h index 991cf05134..de4a406568 100644 --- a/include/hw/acpi/aml-build.h +++ b/include/hw/acpi/aml-build.h @@ -223,6 +223,23 @@ struct AcpiBuildTables { BIOSLinker *linker; } AcpiBuildTables; +/* + * ACPI 5.0: 6.4.3.8.2 Serial Bus Connection Descriptors + * Serial Bus Type + */ +#define AML_SERIAL_BUS_TYPE_I2C 1 +#define AML_SERIAL_BUS_TYPE_SPI 2 +#define AML_SERIAL_BUS_TYPE_UART 3 + +/* + * ACPI 5.0: 6.4.3.8.2 Serial Bus Connection Descriptors + * General Flags + */ +/* Slave Mode */ +#define AML_SERIAL_BUS_FLAG_MASTER_DEVICE (1 << 0) +/* Consumer/Producer */ +#define AML_SERIAL_BUS_FLAG_CONSUME_ONLY (1 << 1) + /** * init_aml_allocator: * @@ -347,6 +364,7 @@ Aml *aml_qword_memory(AmlDecode dec, AmlMinFixed min_fixed, Aml *aml_dma(AmlDmaType typ, AmlDmaBusMaster bm, AmlTransferSize sz, uint8_t channel); Aml *aml_sleep(uint64_t msec); +Aml *aml_i2c_serial_bus_device(uint16_t address, const char *resource_source); /* Block AML object primitives */ Aml *aml_scope(const char *name_format, ...) GCC_FMT_ATTR(1, 2); -- 2.11.0