acpi_status acpi_hw_register_write(u32 register_id, u32 value) { acpi_status status; u32 read_value; struct acpi_generic_address reg; ACPI_FUNCTION_TRACE(hw_register_write); switch (register_id) { case ACPI_REGISTER_PM1_STATUS: /* PM1 A/B: 16-bit access each */ /* * Handle the "ignored" bit in PM1 Status. According to the ACPI * specification, ignored bits are to be preserved when writing. * Normally, this would mean a read/modify/write sequence. However, * preserving a bit in the status register is different. Writing a * one clears the status, and writing a zero preserves the status. * Therefore, we must always write zero to the ignored bit. * * This behavior is clarified in the ACPI 4.0 specification. */ value &= ~ACPI_PM1_STATUS_PRESERVED_BITS; status = acpi_hw_write_multiple(value, &acpi_gbl_xpm1a_status, &acpi_gbl_xpm1b_status); break; case ACPI_REGISTER_PM1_ENABLE: /* PM1 A/B: 16-bit access each */ status = acpi_hw_write_multiple(value, &acpi_gbl_xpm1a_enable, &acpi_gbl_xpm1b_enable); break; case ACPI_REGISTER_PM1_CONTROL: /* PM1 A/B: 16-bit access each */ /* * Perform a read first to preserve certain bits (per ACPI spec) * Note: This includes SCI_EN, we never want to change this bit */ status = acpi_hw_read_multiple(&read_value, &acpi_gbl_FADT. xpm1a_control_block, &acpi_gbl_FADT. xpm1b_control_block); if (ACPI_FAILURE(status)) { goto exit; } /* Insert the bits to be preserved */ ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS, read_value); /* Now we can write the data */ status = acpi_hw_write_multiple(value, &acpi_gbl_FADT. xpm1a_control_block, &acpi_gbl_FADT. xpm1b_control_block); break; case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ /* * For control registers, all reserved bits must be preserved, * as per the ACPI spec. */ status = acpi_hw_read(&read_value, &acpi_gbl_FADT.xpm2_control_block); if (ACPI_FAILURE(status)) { goto exit; } /* Insert the bits to be preserved */ ACPI_INSERT_BITS(value, ACPI_PM2_CONTROL_PRESERVED_BITS, read_value); status = acpi_hw_write(value, &acpi_gbl_FADT.xpm2_control_block); break; case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ status = acpi_hw_write(value, &acpi_gbl_FADT.xpm_timer_block); break; case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ /* SMI_CMD is currently always in IO space */ status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, value, 8); break; case ACPI_REGISTER_GPE0_STATUS: reg = acpi_gbl_FADT.xgpe0_block; reg.bit_width = 32; reg.address = 0x420; status = acpi_hw_write(value, ®); break; case ACPI_REGISTER_GPE0_ENABLE: reg = acpi_gbl_FADT.xgpe0_block; reg.bit_width = 32; reg.address = 0x428; status = acpi_hw_write(value, ®); break; default: ACPI_ERROR((AE_INFO, "Unknown Register ID: 0x%X", register_id)); status = AE_BAD_PARAMETER; break; } exit: return_ACPI_STATUS(status); }
acpi_status acpi_hw_register_write(u32 register_id, u32 value) { acpi_status status; u32 read_value; ACPI_FUNCTION_TRACE(hw_register_write); switch (register_id) { case ACPI_REGISTER_PM1_STATUS: value &= ~ACPI_PM1_STATUS_PRESERVED_BITS; status = acpi_hw_write_multiple(value, &acpi_gbl_xpm1a_status, &acpi_gbl_xpm1b_status); break; case ACPI_REGISTER_PM1_ENABLE: status = acpi_hw_write_multiple(value, &acpi_gbl_xpm1a_enable, &acpi_gbl_xpm1b_enable); break; case ACPI_REGISTER_PM1_CONTROL: status = acpi_hw_read_multiple(&read_value, &acpi_gbl_FADT. xpm1a_control_block, &acpi_gbl_FADT. xpm1b_control_block); if (ACPI_FAILURE(status)) { goto exit; } ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS, read_value); status = acpi_hw_write_multiple(value, &acpi_gbl_FADT. xpm1a_control_block, &acpi_gbl_FADT. xpm1b_control_block); break; case ACPI_REGISTER_PM2_CONTROL: status = acpi_hw_read(&read_value, &acpi_gbl_FADT.xpm2_control_block); if (ACPI_FAILURE(status)) { goto exit; } ACPI_INSERT_BITS(value, ACPI_PM2_CONTROL_PRESERVED_BITS, read_value); status = acpi_hw_write(value, &acpi_gbl_FADT.xpm2_control_block); break; case ACPI_REGISTER_PM_TIMER: status = acpi_hw_write(value, &acpi_gbl_FADT.xpm_timer_block); break; case ACPI_REGISTER_SMI_COMMAND_BLOCK: status = acpi_hw_write_port(acpi_gbl_FADT.smi_command, value, 8); break; default: ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id)); status = AE_BAD_PARAMETER; break; } exit: return_ACPI_STATUS(status); }