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https://github.com/brain-hackers/u-boot-brain
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acpi: Support generating a multi-function _DSM for devices
Add a function to generate ACPI code for a _DSM method for a device. This includes functions for starting and ending each part of the _DSM. Signed-off-by: Simon Glass <sjg@chromium.org> [bmeng: fix the "new blank line at EOF" git warning] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
Bin Meng
parent
da7cff338f
commit
88490e1979
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@ -28,6 +28,9 @@ struct udevice;
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/* Length of a full path to an ACPI device */
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#define ACPI_PATH_MAX 30
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/* UUID for an I2C _DSM method */
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#define ACPI_DSM_I2C_HID_UUID "3cdff6f7-4267-4555-ad05-b30a3d8938de"
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/* Values that can be returned for ACPI device _STA method */
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enum acpi_dev_status {
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ACPI_DSTATUS_PRESENT = BIT(0),
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@ -319,6 +322,17 @@ int acpi_device_write_gpio_desc(struct acpi_ctx *ctx,
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int acpi_device_write_interrupt_or_gpio(struct acpi_ctx *ctx,
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struct udevice *dev, const char *prop);
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/**
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* acpi_device_write_dsm_i2c_hid() - Write a device-specific method for HID
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*
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* This writes a DSM for an I2C Human-Interface Device based on the config
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* provided
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*
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* @hid_desc_reg_offset: HID register offset
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*/
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int acpi_device_write_dsm_i2c_hid(struct acpi_ctx *ctx,
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int hid_desc_reg_offset);
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/**
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* acpi_device_write_i2c_dev() - Write an I2C device to ACPI
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*
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@ -666,4 +666,103 @@ void acpigen_write_return_singleton_buffer(struct acpi_ctx *ctx, uint arg);
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*/
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void acpigen_write_return_byte(struct acpi_ctx *ctx, uint arg);
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/**
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* acpigen_write_dsm_start() - Start a _DSM method
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*
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* Generate ACPI AML code to start the _DSM method.
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*
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* The functions need to be called in the correct sequence as below.
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*
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* Within the <generate-code-here> region, Local0 and Local1 must be are left
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* untouched, but Local2-Local7 can be used
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*
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* Arguments passed into _DSM method:
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* Arg0 = UUID
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* Arg1 = Revision
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* Arg2 = Function index
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* Arg3 = Function-specific arguments
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*
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* AML code generated looks like this:
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* Method (_DSM, 4, Serialized) { -- acpigen_write_dsm_start)
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* ToBuffer (Arg0, Local0)
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* If (LEqual (Local0, ToUUID(uuid))) { -- acpigen_write_dsm_uuid_start
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* ToInteger (Arg2, Local1)
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* If (LEqual (Local1, 0)) { -- acpigen_write_dsm_uuid_start_cond
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* <generate-code-here>
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* } -- acpigen_write_dsm_uuid_end_cond
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* ...
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* If (LEqual (Local1, n)) { -- acpigen_write_dsm_uuid_start_cond
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* <generate-code-here>
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* } -- acpigen_write_dsm_uuid_end_cond
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* Return (Buffer (One) { 0x0 })
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* } -- acpigen_write_dsm_uuid_end
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* ...
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* If (LEqual (Local0, ToUUID(uuidn))) {
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* ...
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* }
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* Return (Buffer (One) { 0x0 }) -- acpigen_write_dsm_end
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* }
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*
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* @ctx: ACPI context pointer
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*/
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void acpigen_write_dsm_start(struct acpi_ctx *ctx);
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/**
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* acpigen_write_dsm_uuid_start() - Start a new UUID block
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*
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* This starts generation of code to handle a particular UUID:
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*
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* If (LEqual (Local0, ToUUID(uuid))) {
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* ToInteger (Arg2, Local1)
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*
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* @ctx: ACPI context pointer
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*/
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int acpigen_write_dsm_uuid_start(struct acpi_ctx *ctx, const char *uuid);
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/**
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* acpigen_write_dsm_uuid_start_cond() - Start a new condition block
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*
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* This starts generation of condition-checking code to handle a particular
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* function:
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*
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* If (LEqual (Local1, i))
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*
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* @ctx: ACPI context pointer
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*/
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void acpigen_write_dsm_uuid_start_cond(struct acpi_ctx *ctx, int seq);
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/**
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* acpigen_write_dsm_uuid_end_cond() - Start a new condition block
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*
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* This ends generation of condition-checking code to handle a particular
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* function:
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*
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* }
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*
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* @ctx: ACPI context pointer
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*/
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void acpigen_write_dsm_uuid_end_cond(struct acpi_ctx *ctx);
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/**
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* acpigen_write_dsm_uuid_end() - End a UUID block
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*
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* This ends generation of code to handle a particular UUID:
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*
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* Return (Buffer (One) { 0x0 })
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*
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* @ctx: ACPI context pointer
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*/
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void acpigen_write_dsm_uuid_end(struct acpi_ctx *ctx);
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/**
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* acpigen_write_dsm_end() - End a _DSM method
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*
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* This ends generates of the _DSM block:
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*
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* Return (Buffer (One) { 0x0 })
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*
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* @ctx: ACPI context pointer
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*/
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void acpigen_write_dsm_end(struct acpi_ctx *ctx);
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#endif
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@ -487,6 +487,49 @@ int acpi_device_add_power_res(struct acpi_ctx *ctx, u32 tx_state_val,
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return 0;
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}
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int acpi_device_write_dsm_i2c_hid(struct acpi_ctx *ctx,
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int hid_desc_reg_offset)
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{
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int ret;
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acpigen_write_dsm_start(ctx);
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ret = acpigen_write_dsm_uuid_start(ctx, ACPI_DSM_I2C_HID_UUID);
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if (ret)
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return log_ret(ret);
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acpigen_write_dsm_uuid_start_cond(ctx, 0);
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/* ToInteger (Arg1, Local2) */
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acpigen_write_to_integer(ctx, ARG1_OP, LOCAL2_OP);
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/* If (LEqual (Local2, 0x0)) */
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acpigen_write_if_lequal_op_int(ctx, LOCAL2_OP, 0x0);
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/* Return (Buffer (One) { 0x1f }) */
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acpigen_write_return_singleton_buffer(ctx, 0x1f);
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acpigen_pop_len(ctx); /* Pop : If */
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/* Else */
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acpigen_write_else(ctx);
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/* If (LEqual (Local2, 0x1)) */
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acpigen_write_if_lequal_op_int(ctx, LOCAL2_OP, 0x1);
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/* Return (Buffer (One) { 0x3f }) */
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acpigen_write_return_singleton_buffer(ctx, 0x3f);
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acpigen_pop_len(ctx); /* Pop : If */
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/* Else */
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acpigen_write_else(ctx);
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/* Return (Buffer (One) { 0x0 }) */
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acpigen_write_return_singleton_buffer(ctx, 0x0);
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acpigen_pop_len(ctx); /* Pop : Else */
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acpigen_pop_len(ctx); /* Pop : Else */
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acpigen_write_dsm_uuid_end_cond(ctx);
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acpigen_write_dsm_uuid_start_cond(ctx, 1);
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acpigen_write_return_byte(ctx, hid_desc_reg_offset);
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acpigen_write_dsm_uuid_end_cond(ctx);
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acpigen_write_dsm_uuid_end(ctx);
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acpigen_write_dsm_end(ctx);
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return 0;
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}
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/* ACPI 6.3 section 6.4.3.8.2.1 - I2cSerialBus() */
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static void acpi_device_write_i2c(struct acpi_ctx *ctx,
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const struct acpi_i2c *i2c)
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@ -609,6 +609,60 @@ void acpigen_write_return_byte(struct acpi_ctx *ctx, uint arg)
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acpigen_write_byte(ctx, arg);
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}
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void acpigen_write_dsm_start(struct acpi_ctx *ctx)
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{
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/* Method (_DSM, 4, Serialized) */
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acpigen_write_method_serialized(ctx, "_DSM", 4);
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/* ToBuffer (Arg0, Local0) */
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acpigen_write_to_buffer(ctx, ARG0_OP, LOCAL0_OP);
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}
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int acpigen_write_dsm_uuid_start(struct acpi_ctx *ctx, const char *uuid)
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{
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int ret;
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/* If (LEqual (Local0, ToUUID(uuid))) */
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acpigen_write_if(ctx);
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acpigen_emit_byte(ctx, LEQUAL_OP);
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acpigen_emit_byte(ctx, LOCAL0_OP);
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ret = acpigen_write_uuid(ctx, uuid);
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if (ret)
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return log_msg_ret("uuid", ret);
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/* ToInteger (Arg2, Local1) */
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acpigen_write_to_integer(ctx, ARG2_OP, LOCAL1_OP);
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return 0;
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}
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void acpigen_write_dsm_uuid_start_cond(struct acpi_ctx *ctx, int seq)
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{
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/* If (LEqual (Local1, i)) */
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acpigen_write_if_lequal_op_int(ctx, LOCAL1_OP, seq);
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}
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void acpigen_write_dsm_uuid_end_cond(struct acpi_ctx *ctx)
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{
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acpigen_pop_len(ctx); /* If */
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}
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void acpigen_write_dsm_uuid_end(struct acpi_ctx *ctx)
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{
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/* Default case: Return (Buffer (One) { 0x0 }) */
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acpigen_write_return_singleton_buffer(ctx, 0x0);
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acpigen_pop_len(ctx); /* If (LEqual (Local0, ToUUID(uuid))) */
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}
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void acpigen_write_dsm_end(struct acpi_ctx *ctx)
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{
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/* Return (Buffer (One) { 0x0 }) */
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acpigen_write_return_singleton_buffer(ctx, 0x0);
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acpigen_pop_len(ctx); /* Method _DSM */
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}
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/**
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* acpigen_get_dw0_in_local5() - Generate code to put dw0 cfg0 in local5
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*
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@ -10,6 +10,7 @@
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#include <dm.h>
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#include <irq.h>
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#include <malloc.h>
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#include <uuid.h>
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#include <acpi/acpigen.h>
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#include <acpi/acpi_device.h>
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#include <acpi/acpi_table.h>
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@ -1218,3 +1219,127 @@ static int dm_test_acpi_write_return(struct unit_test_state *uts)
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return 0;
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}
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DM_TEST(dm_test_acpi_write_return, 0);
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/* Test emitting a DSM for an I2C HID */
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static int dm_test_acpi_write_i2c_dsm(struct unit_test_state *uts)
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{
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char uuid_str[UUID_STR_LEN + 1];
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const int reg_offset = 0x20;
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struct acpi_ctx *ctx;
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u8 *ptr;
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ut_assertok(alloc_context(&ctx));
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ptr = acpigen_get_current(ctx);
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ut_assertok(acpi_device_write_dsm_i2c_hid(ctx, reg_offset));
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/* acpigen_write_dsm_start() */
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ut_asserteq(METHOD_OP, *ptr++);
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ut_asserteq(0x78, acpi_test_get_length(ptr));
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ptr += 3;
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ut_asserteq_strn("_DSM", (char *)ptr);
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ptr += 4;
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ut_asserteq(ACPI_METHOD_SERIALIZED_MASK | 4, *ptr++);
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ut_asserteq(TO_BUFFER_OP, *ptr++);
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ut_asserteq(ARG0_OP, *ptr++);
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ut_asserteq(LOCAL0_OP, *ptr++);
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/* acpigen_write_dsm_uuid_start() */
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ut_asserteq(IF_OP, *ptr++);
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ut_asserteq(0x65, acpi_test_get_length(ptr));
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ptr += 3;
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ut_asserteq(LEQUAL_OP, *ptr++);
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ut_asserteq(LOCAL0_OP, *ptr++);
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ut_asserteq(BUFFER_OP, *ptr++);
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ut_asserteq(UUID_BIN_LEN + 6, acpi_test_get_length(ptr));
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ptr += 3;
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ut_asserteq(WORD_PREFIX, *ptr++);
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ut_asserteq(UUID_BIN_LEN, get_unaligned((u16 *)ptr));
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ptr += 2;
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uuid_bin_to_str(ptr, uuid_str, UUID_STR_FORMAT_GUID);
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ut_asserteq_str(ACPI_DSM_I2C_HID_UUID, uuid_str);
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ptr += UUID_BIN_LEN;
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ut_asserteq(TO_INTEGER_OP, *ptr++);
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ut_asserteq(ARG2_OP, *ptr++);
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ut_asserteq(LOCAL1_OP, *ptr++);
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/* acpigen_write_dsm_uuid_start_cond() */
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ut_asserteq(IF_OP, *ptr++);
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ut_asserteq(0x34, acpi_test_get_length(ptr));
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ptr += 3;
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ut_asserteq(LEQUAL_OP, *ptr++);
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ut_asserteq(LOCAL1_OP, *ptr++);
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ut_asserteq(ZERO_OP, *ptr++);
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/*
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* See code from acpi_device_write_dsm_i2c_hid(). We don't check every
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* piece
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*/
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ut_asserteq(TO_INTEGER_OP, *ptr++);
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ut_asserteq(ARG1_OP, *ptr++);
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ut_asserteq(LOCAL2_OP, *ptr++);
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ut_asserteq(IF_OP, *ptr++);
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ut_asserteq(0xd, acpi_test_get_length(ptr));
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ptr += 3;
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ut_asserteq(LEQUAL_OP, *ptr++);
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ut_asserteq(LOCAL2_OP, *ptr++);
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ut_asserteq(ZERO_OP, *ptr++); /* function 0 */
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ut_asserteq(RETURN_OP, *ptr++);
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ut_asserteq(BUFFER_OP, *ptr++);
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ptr += 5;
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ut_asserteq(ELSE_OP, *ptr++);
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ptr += 3;
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ut_asserteq(IF_OP, *ptr++);
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ut_asserteq(0xd, acpi_test_get_length(ptr));
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ptr += 3;
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ut_asserteq(LEQUAL_OP, *ptr++);
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ut_asserteq(LOCAL2_OP, *ptr++);
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ut_asserteq(ONE_OP, *ptr++);
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ut_asserteq(RETURN_OP, *ptr++);
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ut_asserteq(BUFFER_OP, *ptr++);
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ptr += 5;
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ut_asserteq(ELSE_OP, *ptr++);
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ptr += 3;
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ut_asserteq(RETURN_OP, *ptr++);
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ut_asserteq(BUFFER_OP, *ptr++);
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ptr += 5;
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/* acpigen_write_dsm_uuid_start_cond() */
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ut_asserteq(IF_OP, *ptr++);
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ut_asserteq(9, acpi_test_get_length(ptr));
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ptr += 3;
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ut_asserteq(LEQUAL_OP, *ptr++);
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ut_asserteq(LOCAL1_OP, *ptr++);
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ut_asserteq(ONE_OP, *ptr++); /* function 1 */
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ut_asserteq(RETURN_OP, *ptr++);
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ut_asserteq(BYTE_PREFIX, *ptr++);
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ut_asserteq(reg_offset, *ptr++);
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/* acpigen_write_dsm_uuid_end() */
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ut_asserteq(RETURN_OP, *ptr++);
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ut_asserteq(BUFFER_OP, *ptr++);
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ptr += 5;
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/* acpigen_write_dsm_end */
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ut_asserteq(RETURN_OP, *ptr++);
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ut_asserteq(BUFFER_OP, *ptr++);
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ptr += 5;
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ut_asserteq_ptr(ptr, ctx->current);
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free_context(&ctx);
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return 0;
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}
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DM_TEST(dm_test_acpi_write_i2c_dsm, 0);
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