diff options
Diffstat (limited to 'sound/hda/intel-sdw-acpi.c')
| -rw-r--r-- | sound/hda/intel-sdw-acpi.c | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/sound/hda/intel-sdw-acpi.c b/sound/hda/intel-sdw-acpi.c deleted file mode 100644 index d3511135f7d3..000000000000 --- a/sound/hda/intel-sdw-acpi.c +++ /dev/null @@ -1,204 +0,0 @@ -// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) -// Copyright(c) 2015-2021 Intel Corporation. - -/* - * SDW Intel ACPI scan helpers - */ - -#include <linux/acpi.h> -#include <linux/bits.h> -#include <linux/bitfield.h> -#include <linux/device.h> -#include <linux/errno.h> -#include <linux/export.h> -#include <linux/module.h> -#include <linux/property.h> -#include <linux/soundwire/sdw_intel.h> -#include <linux/string.h> - -#define SDW_LINK_TYPE 4 /* from Intel ACPI documentation */ - -static int ctrl_link_mask; -module_param_named(sdw_link_mask, ctrl_link_mask, int, 0444); -MODULE_PARM_DESC(sdw_link_mask, "Intel link mask (one bit per link)"); - -static ulong ctrl_addr = 0x40000000; -module_param_named(sdw_ctrl_addr, ctrl_addr, ulong, 0444); -MODULE_PARM_DESC(sdw_ctrl_addr, "Intel SoundWire Controller _ADR"); - -static bool is_link_enabled(struct fwnode_handle *fw_node, u8 idx) -{ - struct fwnode_handle *link; - char name[32]; - u32 quirk_mask = 0; - - /* Find master handle */ - snprintf(name, sizeof(name), - "mipi-sdw-link-%hhu-subproperties", idx); - - link = fwnode_get_named_child_node(fw_node, name); - if (!link) - return false; - - fwnode_property_read_u32(link, - "intel-quirk-mask", - &quirk_mask); - - fwnode_handle_put(link); - - if (quirk_mask & SDW_INTEL_QUIRK_MASK_BUS_DISABLE) - return false; - - return true; -} - -static int -sdw_intel_scan_controller(struct sdw_intel_acpi_info *info) -{ - struct acpi_device *adev = acpi_fetch_acpi_dev(info->handle); - struct fwnode_handle *fwnode; - unsigned long list; - unsigned int i; - u32 count; - u32 tmp; - int ret; - - if (!adev) - return -EINVAL; - - fwnode = acpi_fwnode_handle(adev); - - /* - * Found controller, find links supported - * - * In theory we could check the number of links supported in - * hardware, but in that step we cannot assume SoundWire IP is - * powered. - * - * In addition, if the BIOS doesn't even provide this - * 'master-count' property then all the inits based on link - * masks will fail as well. - * - * We will check the hardware capabilities in the startup() step - */ - ret = fwnode_property_read_u32(fwnode, "mipi-sdw-manager-list", &tmp); - if (ret) { - ret = fwnode_property_read_u32(fwnode, "mipi-sdw-master-count", &count); - if (ret) { - dev_err(&adev->dev, - "Failed to read mipi-sdw-master-count: %d\n", - ret); - return ret; - } - list = GENMASK(count - 1, 0); - } else { - list = tmp; - count = hweight32(list); - } - - /* Check count is within bounds */ - if (count > SDW_INTEL_MAX_LINKS) { - dev_err(&adev->dev, "Link count %d exceeds max %d\n", - count, SDW_INTEL_MAX_LINKS); - return -EINVAL; - } - - if (!count) { - dev_warn(&adev->dev, "No SoundWire links detected\n"); - return -EINVAL; - } - dev_dbg(&adev->dev, "ACPI reports %d SDW Link devices\n", count); - - info->count = count; - info->link_mask = 0; - - for_each_set_bit(i, &list, SDW_INTEL_MAX_LINKS) { - if (ctrl_link_mask && !(ctrl_link_mask & BIT(i))) { - dev_dbg(&adev->dev, - "Link %d masked, will not be enabled\n", i); - continue; - } - - if (!is_link_enabled(fwnode, i)) { - dev_dbg(&adev->dev, - "Link %d not selected in firmware\n", i); - continue; - } - - info->link_mask |= BIT(i); - } - - return 0; -} - -static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level, - void *cdata, void **return_value) -{ - struct sdw_intel_acpi_info *info = cdata; - u64 adr; - int ret; - - ret = acpi_get_local_u64_address(handle, &adr); - if (ret < 0) - return AE_OK; /* keep going */ - - if (!acpi_fetch_acpi_dev(handle)) { - pr_err("%s: Couldn't find ACPI handle\n", __func__); - return AE_NOT_FOUND; - } - - /* - * On some Intel platforms, multiple children of the HDAS - * device can be found, but only one of them is the SoundWire - * controller. The SNDW device is always exposed with - * Name(_ADR, 0x40000000), with bits 31..28 representing the - * SoundWire link so filter accordingly - */ - if (FIELD_GET(GENMASK(31, 28), adr) != SDW_LINK_TYPE) - return AE_OK; /* keep going */ - - if (adr != ctrl_addr) - return AE_OK; /* keep going */ - - /* found the correct SoundWire controller */ - info->handle = handle; - - /* device found, stop namespace walk */ - return AE_CTRL_TERMINATE; -} - -/** - * sdw_intel_acpi_scan() - SoundWire Intel init routine - * @parent_handle: ACPI parent handle - * @info: description of what firmware/DSDT tables expose - * - * This scans the namespace and queries firmware to figure out which - * links to enable. A follow-up use of sdw_intel_probe() and - * sdw_intel_startup() is required for creation of devices and bus - * startup - */ -int sdw_intel_acpi_scan(acpi_handle parent_handle, - struct sdw_intel_acpi_info *info) -{ - acpi_status status; - - info->handle = NULL; - /* - * In the HDAS ACPI scope, 'SNDW' may be either the child of - * 'HDAS' or the grandchild of 'HDAS'. So let's go through - * the ACPI from 'HDAS' at max depth of 2 to find the 'SNDW' - * device. - */ - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, - parent_handle, 2, - sdw_intel_acpi_cb, - NULL, info, NULL); - if (ACPI_FAILURE(status) || info->handle == NULL) - return -ENODEV; - - return sdw_intel_scan_controller(info); -} -EXPORT_SYMBOL_NS(sdw_intel_acpi_scan, "SND_INTEL_SOUNDWIRE_ACPI"); - -MODULE_LICENSE("Dual BSD/GPL"); -MODULE_DESCRIPTION("Intel Soundwire ACPI helpers"); |