diff options
author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-24 21:22:33 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-24 21:22:33 +0100 |
commit | baea7b946f00a291b166ccae7fcfed6c01530cc6 (patch) | |
tree | 4aa275fbdbec9c7b9b4629e8bee2bbecd3c6a6af /drivers/acpi/acpica/hwxface.c | |
parent | ae19ffbadc1b2100285a5b5b3d0a4e0a11390904 (diff) | |
parent | 94e0fb086fc5663c38bbc0fe86d698be8314f82f (diff) |
Merge branch 'origin' into for-linus
Conflicts:
MAINTAINERS
Diffstat (limited to 'drivers/acpi/acpica/hwxface.c')
-rw-r--r-- | drivers/acpi/acpica/hwxface.c | 181 |
1 files changed, 113 insertions, 68 deletions
diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c index 9829979f2bd..647c7b6e675 100644 --- a/drivers/acpi/acpica/hwxface.c +++ b/drivers/acpi/acpica/hwxface.c @@ -78,9 +78,22 @@ acpi_status acpi_reset(void) return_ACPI_STATUS(AE_NOT_EXIST); } - /* Write the reset value to the reset register */ + if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) { + /* + * For I/O space, write directly to the OSL. This bypasses the port + * validation mechanism, which may block a valid write to the reset + * register. + */ + status = + acpi_os_write_port((acpi_io_address) reset_reg->address, + acpi_gbl_FADT.reset_value, + reset_reg->bit_width); + } else { + /* Write the reset value to the reset register */ + + status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg); + } - status = acpi_write(acpi_gbl_FADT.reset_value, reset_reg); return_ACPI_STATUS(status); } @@ -97,67 +110,92 @@ ACPI_EXPORT_SYMBOL(acpi_reset) * * DESCRIPTION: Read from either memory or IO space. * + * LIMITATIONS: <These limitations also apply to acpi_write> + * bit_width must be exactly 8, 16, 32, or 64. + * space_iD must be system_memory or system_iO. + * bit_offset and access_width are currently ignored, as there has + * not been a need to implement these. + * ******************************************************************************/ -acpi_status acpi_read(u32 *value, struct acpi_generic_address *reg) +acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg) { + u32 value; u32 width; u64 address; acpi_status status; ACPI_FUNCTION_NAME(acpi_read); - /* - * Must have a valid pointer to a GAS structure, and a non-zero address - * within. - */ - if (!reg) { + if (!return_value) { return (AE_BAD_PARAMETER); } - /* Get a local copy of the address. Handles possible alignment issues */ + /* Validate contents of the GAS register. Allow 64-bit transfers */ - ACPI_MOVE_64_TO_64(&address, ®->address); - if (!address) { - return (AE_BAD_ADDRESS); + status = acpi_hw_validate_register(reg, 64, &address); + if (ACPI_FAILURE(status)) { + return (status); } - /* Supported widths are 8/16/32 */ - width = reg->bit_width; - if ((width != 8) && (width != 16) && (width != 32)) { - return (AE_SUPPORT); + if (width == 64) { + width = 32; /* Break into two 32-bit transfers */ } - /* Initialize entire 32-bit return value to zero */ + /* Initialize entire 64-bit return value to zero */ - *value = 0; + *return_value = 0; + value = 0; /* * Two address spaces supported: Memory or IO. PCI_Config is * not supported here because the GAS structure is insufficient */ - switch (reg->space_id) { - case ACPI_ADR_SPACE_SYSTEM_MEMORY: + if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { + status = acpi_os_read_memory((acpi_physical_address) + address, &value, width); + if (ACPI_FAILURE(status)) { + return (status); + } + *return_value = value; - status = acpi_os_read_memory((acpi_physical_address) address, - value, width); - break; + if (reg->bit_width == 64) { - case ACPI_ADR_SPACE_SYSTEM_IO: + /* Read the top 32 bits */ - status = - acpi_hw_read_port((acpi_io_address) address, value, width); - break; + status = acpi_os_read_memory((acpi_physical_address) + (address + 4), &value, 32); + if (ACPI_FAILURE(status)) { + return (status); + } + *return_value |= ((u64)value << 32); + } + } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ - default: - ACPI_ERROR((AE_INFO, - "Unsupported address space: %X", reg->space_id)); - return (AE_BAD_PARAMETER); + status = acpi_hw_read_port((acpi_io_address) + address, &value, width); + if (ACPI_FAILURE(status)) { + return (status); + } + *return_value = value; + + if (reg->bit_width == 64) { + + /* Read the top 32 bits */ + + status = acpi_hw_read_port((acpi_io_address) + (address + 4), &value, 32); + if (ACPI_FAILURE(status)) { + return (status); + } + *return_value |= ((u64)value << 32); + } } ACPI_DEBUG_PRINT((ACPI_DB_IO, - "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n", - *value, width, ACPI_FORMAT_UINT64(address), + "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n", + ACPI_FORMAT_UINT64(*return_value), reg->bit_width, + ACPI_FORMAT_UINT64(address), acpi_ut_get_region_name(reg->space_id))); return (status); @@ -169,7 +207,7 @@ ACPI_EXPORT_SYMBOL(acpi_read) * * FUNCTION: acpi_write * - * PARAMETERS: Value - To be written + * PARAMETERS: Value - Value to be written * Reg - GAS register structure * * RETURN: Status @@ -177,7 +215,7 @@ ACPI_EXPORT_SYMBOL(acpi_read) * DESCRIPTION: Write to either memory or IO space. * ******************************************************************************/ -acpi_status acpi_write(u32 value, struct acpi_generic_address *reg) +acpi_status acpi_write(u64 value, struct acpi_generic_address *reg) { u32 width; u64 address; @@ -185,54 +223,61 @@ acpi_status acpi_write(u32 value, struct acpi_generic_address *reg) ACPI_FUNCTION_NAME(acpi_write); - /* - * Must have a valid pointer to a GAS structure, and a non-zero address - * within. - */ - if (!reg) { - return (AE_BAD_PARAMETER); - } - - /* Get a local copy of the address. Handles possible alignment issues */ + /* Validate contents of the GAS register. Allow 64-bit transfers */ - ACPI_MOVE_64_TO_64(&address, ®->address); - if (!address) { - return (AE_BAD_ADDRESS); + status = acpi_hw_validate_register(reg, 64, &address); + if (ACPI_FAILURE(status)) { + return (status); } - /* Supported widths are 8/16/32 */ - width = reg->bit_width; - if ((width != 8) && (width != 16) && (width != 32)) { - return (AE_SUPPORT); + if (width == 64) { + width = 32; /* Break into two 32-bit transfers */ } /* - * Two address spaces supported: Memory or IO. - * PCI_Config is not supported here because the GAS struct is insufficient + * Two address spaces supported: Memory or IO. PCI_Config is + * not supported here because the GAS structure is insufficient */ - switch (reg->space_id) { - case ACPI_ADR_SPACE_SYSTEM_MEMORY: - - status = acpi_os_write_memory((acpi_physical_address) address, - value, width); - break; + if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { + status = acpi_os_write_memory((acpi_physical_address) + address, ACPI_LODWORD(value), + width); + if (ACPI_FAILURE(status)) { + return (status); + } - case ACPI_ADR_SPACE_SYSTEM_IO: + if (reg->bit_width == 64) { + status = acpi_os_write_memory((acpi_physical_address) + (address + 4), + ACPI_HIDWORD(value), 32); + if (ACPI_FAILURE(status)) { + return (status); + } + } + } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */ - status = acpi_hw_write_port((acpi_io_address) address, value, + status = acpi_hw_write_port((acpi_io_address) + address, ACPI_LODWORD(value), width); - break; + if (ACPI_FAILURE(status)) { + return (status); + } - default: - ACPI_ERROR((AE_INFO, - "Unsupported address space: %X", reg->space_id)); - return (AE_BAD_PARAMETER); + if (reg->bit_width == 64) { + status = acpi_hw_write_port((acpi_io_address) + (address + 4), + ACPI_HIDWORD(value), 32); + if (ACPI_FAILURE(status)) { + return (status); + } + } } ACPI_DEBUG_PRINT((ACPI_DB_IO, - "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n", - value, width, ACPI_FORMAT_UINT64(address), + "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n", + ACPI_FORMAT_UINT64(value), reg->bit_width, + ACPI_FORMAT_UINT64(address), acpi_ut_get_region_name(reg->space_id))); return (status); |