linux/drivers/soundwire/intel_init.c

224 lines
5.1 KiB
C
Raw Normal View History

// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.
/*
* SDW Intel Init Routines
*
* Initializes and creates SDW devices based on ACPI and Hardware values
*/
#include <linux/acpi.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/soundwire/sdw_intel.h>
#include "intel.h"
#define SDW_LINK_TYPE 4 /* from Intel ACPI documentation */
#define SDW_MAX_LINKS 4
#define SDW_SHIM_LCAP 0x0
#define SDW_SHIM_BASE 0x2C000
#define SDW_ALH_BASE 0x2C800
#define SDW_LINK_BASE 0x30000
#define SDW_LINK_SIZE 0x10000
static int link_mask;
module_param_named(sdw_link_mask, link_mask, int, 0444);
MODULE_PARM_DESC(sdw_link_mask, "Intel link mask (one bit per link)");
static int sdw_intel_cleanup_pdev(struct sdw_intel_ctx *ctx)
{
soundwire: intel: update interfaces between ASoC and SoundWire The current interfaces between ASoC and SoundWire are limited by the platform_device infrastructure to an init() and exit() (mapped to the platform driver.probe and .remove) To help with the platform detection, machine driver selection and management of power dependencies between DSP and SoundWire IP, the ASoC side requires: a) an ACPI scan helper, to report if any devices are exposed in the DSDT tables, and if any links are disabled by the BIOS. b) a probe helper that allocates the resources without actually starting the bus. c) a startup helper which does start the bus when all power dependencies are settled. d) an exit helper to free all resources e) an interrupt_enable/disable helper, typically invoked after the startup helper but also used in suspend routines. This patch moves all required interfaces to sdw_intel.h, mainly to allow SoundWire and ASoC parts to be merged separately once the header files are shared between trees. To avoid compilation issues, the conflicts in intel_init.c are blindly removed. This would in theory prevent the code from working, but since there are no users of the Intel Soundwire driver this has no impact. Functionality will be restored when the removal of platform devices is complete. Support for SoundWire + SOF builds will only be provided once all the required pieces are upstream. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191212014507.28050-6-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-12 01:45:01 +00:00
struct sdw_intel_link_res *link = ctx->links;
int i;
if (!link)
return 0;
for (i = 0; i < ctx->count; i++) {
if (link->pdev)
platform_device_unregister(link->pdev);
link++;
}
kfree(ctx->links);
ctx->links = NULL;
return 0;
}
static struct sdw_intel_ctx
*sdw_intel_add_controller(struct sdw_intel_res *res)
{
struct platform_device_info pdevinfo;
struct platform_device *pdev;
soundwire: intel: update interfaces between ASoC and SoundWire The current interfaces between ASoC and SoundWire are limited by the platform_device infrastructure to an init() and exit() (mapped to the platform driver.probe and .remove) To help with the platform detection, machine driver selection and management of power dependencies between DSP and SoundWire IP, the ASoC side requires: a) an ACPI scan helper, to report if any devices are exposed in the DSDT tables, and if any links are disabled by the BIOS. b) a probe helper that allocates the resources without actually starting the bus. c) a startup helper which does start the bus when all power dependencies are settled. d) an exit helper to free all resources e) an interrupt_enable/disable helper, typically invoked after the startup helper but also used in suspend routines. This patch moves all required interfaces to sdw_intel.h, mainly to allow SoundWire and ASoC parts to be merged separately once the header files are shared between trees. To avoid compilation issues, the conflicts in intel_init.c are blindly removed. This would in theory prevent the code from working, but since there are no users of the Intel Soundwire driver this has no impact. Functionality will be restored when the removal of platform devices is complete. Support for SoundWire + SOF builds will only be provided once all the required pieces are upstream. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191212014507.28050-6-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-12 01:45:01 +00:00
struct sdw_intel_link_res *link;
struct sdw_intel_ctx *ctx;
struct acpi_device *adev;
int ret, i;
u8 count;
u32 caps;
if (acpi_bus_get_device(res->handle, &adev))
return NULL;
/* Found controller, find links supported */
count = 0;
ret = fwnode_property_read_u8_array(acpi_fwnode_handle(adev),
"mipi-sdw-master-count", &count, 1);
/* Don't fail on error, continue and use hw value */
if (ret) {
dev_err(&adev->dev,
"Failed to read mipi-sdw-master-count: %d\n", ret);
count = SDW_MAX_LINKS;
}
/* Check SNDWLCAP.LCOUNT */
caps = ioread32(res->mmio_base + SDW_SHIM_BASE + SDW_SHIM_LCAP);
caps &= GENMASK(2, 0);
/* Check HW supported vs property value and use min of two */
count = min_t(u8, caps, count);
/* Check count is within bounds */
if (count > SDW_MAX_LINKS) {
dev_err(&adev->dev, "Link count %d exceeds max %d\n",
count, SDW_MAX_LINKS);
return NULL;
}
if (!count) {
dev_warn(&adev->dev, "No SoundWire links detected\n");
return NULL;
}
dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;
ctx->count = count;
ctx->links = kcalloc(ctx->count, sizeof(*ctx->links), GFP_KERNEL);
if (!ctx->links)
goto link_err;
link = ctx->links;
/* Create SDW Master devices */
for (i = 0; i < count; i++) {
if (link_mask && !(link_mask & BIT(i))) {
dev_dbg(&adev->dev,
"Link %d masked, will not be enabled\n", i);
link++;
continue;
}
soundwire: intel: update interfaces between ASoC and SoundWire The current interfaces between ASoC and SoundWire are limited by the platform_device infrastructure to an init() and exit() (mapped to the platform driver.probe and .remove) To help with the platform detection, machine driver selection and management of power dependencies between DSP and SoundWire IP, the ASoC side requires: a) an ACPI scan helper, to report if any devices are exposed in the DSDT tables, and if any links are disabled by the BIOS. b) a probe helper that allocates the resources without actually starting the bus. c) a startup helper which does start the bus when all power dependencies are settled. d) an exit helper to free all resources e) an interrupt_enable/disable helper, typically invoked after the startup helper but also used in suspend routines. This patch moves all required interfaces to sdw_intel.h, mainly to allow SoundWire and ASoC parts to be merged separately once the header files are shared between trees. To avoid compilation issues, the conflicts in intel_init.c are blindly removed. This would in theory prevent the code from working, but since there are no users of the Intel Soundwire driver this has no impact. Functionality will be restored when the removal of platform devices is complete. Support for SoundWire + SOF builds will only be provided once all the required pieces are upstream. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191212014507.28050-6-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-12 01:45:01 +00:00
link->registers = res->mmio_base + SDW_LINK_BASE
+ (SDW_LINK_SIZE * i);
soundwire: intel: update interfaces between ASoC and SoundWire The current interfaces between ASoC and SoundWire are limited by the platform_device infrastructure to an init() and exit() (mapped to the platform driver.probe and .remove) To help with the platform detection, machine driver selection and management of power dependencies between DSP and SoundWire IP, the ASoC side requires: a) an ACPI scan helper, to report if any devices are exposed in the DSDT tables, and if any links are disabled by the BIOS. b) a probe helper that allocates the resources without actually starting the bus. c) a startup helper which does start the bus when all power dependencies are settled. d) an exit helper to free all resources e) an interrupt_enable/disable helper, typically invoked after the startup helper but also used in suspend routines. This patch moves all required interfaces to sdw_intel.h, mainly to allow SoundWire and ASoC parts to be merged separately once the header files are shared between trees. To avoid compilation issues, the conflicts in intel_init.c are blindly removed. This would in theory prevent the code from working, but since there are no users of the Intel Soundwire driver this has no impact. Functionality will be restored when the removal of platform devices is complete. Support for SoundWire + SOF builds will only be provided once all the required pieces are upstream. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191212014507.28050-6-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-12 01:45:01 +00:00
link->shim = res->mmio_base + SDW_SHIM_BASE;
link->alh = res->mmio_base + SDW_ALH_BASE;
soundwire: intel: update interfaces between ASoC and SoundWire The current interfaces between ASoC and SoundWire are limited by the platform_device infrastructure to an init() and exit() (mapped to the platform driver.probe and .remove) To help with the platform detection, machine driver selection and management of power dependencies between DSP and SoundWire IP, the ASoC side requires: a) an ACPI scan helper, to report if any devices are exposed in the DSDT tables, and if any links are disabled by the BIOS. b) a probe helper that allocates the resources without actually starting the bus. c) a startup helper which does start the bus when all power dependencies are settled. d) an exit helper to free all resources e) an interrupt_enable/disable helper, typically invoked after the startup helper but also used in suspend routines. This patch moves all required interfaces to sdw_intel.h, mainly to allow SoundWire and ASoC parts to be merged separately once the header files are shared between trees. To avoid compilation issues, the conflicts in intel_init.c are blindly removed. This would in theory prevent the code from working, but since there are no users of the Intel Soundwire driver this has no impact. Functionality will be restored when the removal of platform devices is complete. Support for SoundWire + SOF builds will only be provided once all the required pieces are upstream. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191212014507.28050-6-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-12 01:45:01 +00:00
link->ops = res->ops;
link->dev = res->dev;
memset(&pdevinfo, 0, sizeof(pdevinfo));
pdevinfo.parent = res->parent;
pdevinfo.name = "int-sdw";
pdevinfo.id = i;
pdevinfo.fwnode = acpi_fwnode_handle(adev);
pdev = platform_device_register_full(&pdevinfo);
if (IS_ERR(pdev)) {
dev_err(&adev->dev,
"platform device creation failed: %ld\n",
PTR_ERR(pdev));
goto pdev_err;
}
link->pdev = pdev;
link++;
}
return ctx;
pdev_err:
sdw_intel_cleanup_pdev(ctx);
link_err:
kfree(ctx);
return NULL;
}
static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
void *cdata, void **return_value)
{
struct sdw_intel_res *res = cdata;
struct acpi_device *adev;
acpi_status status;
u64 adr;
status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
if (ACPI_FAILURE(status))
return AE_OK; /* keep going */
if (acpi_bus_get_device(handle, &adev)) {
pr_err("%s: Couldn't find ACPI handle\n", __func__);
return AE_NOT_FOUND;
}
res->handle = handle;
/*
* 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 ((adr & GENMASK(31, 28)) >> 28 != SDW_LINK_TYPE)
return AE_OK; /* keep going */
/* device found, stop namespace walk */
return AE_CTRL_TERMINATE;
}
/**
* sdw_intel_init() - SoundWire Intel init routine
* @parent_handle: ACPI parent handle
* @res: resource data
*
* This scans the namespace and creates SoundWire link controller devices
* based on the info queried.
*/
void *sdw_intel_init(acpi_handle *parent_handle, struct sdw_intel_res *res)
{
acpi_status status;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
parent_handle, 1,
sdw_intel_acpi_cb,
NULL, res, NULL);
if (ACPI_FAILURE(status))
return NULL;
return sdw_intel_add_controller(res);
}
/**
* sdw_intel_exit() - SoundWire Intel exit
* @arg: callback context
*
* Delete the controller instances created and cleanup
*/
soundwire: intel: update interfaces between ASoC and SoundWire The current interfaces between ASoC and SoundWire are limited by the platform_device infrastructure to an init() and exit() (mapped to the platform driver.probe and .remove) To help with the platform detection, machine driver selection and management of power dependencies between DSP and SoundWire IP, the ASoC side requires: a) an ACPI scan helper, to report if any devices are exposed in the DSDT tables, and if any links are disabled by the BIOS. b) a probe helper that allocates the resources without actually starting the bus. c) a startup helper which does start the bus when all power dependencies are settled. d) an exit helper to free all resources e) an interrupt_enable/disable helper, typically invoked after the startup helper but also used in suspend routines. This patch moves all required interfaces to sdw_intel.h, mainly to allow SoundWire and ASoC parts to be merged separately once the header files are shared between trees. To avoid compilation issues, the conflicts in intel_init.c are blindly removed. This would in theory prevent the code from working, but since there are no users of the Intel Soundwire driver this has no impact. Functionality will be restored when the removal of platform devices is complete. Support for SoundWire + SOF builds will only be provided once all the required pieces are upstream. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191212014507.28050-6-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
2019-12-12 01:45:01 +00:00
void sdw_intel_exit(struct sdw_intel_ctx *ctx)
{
sdw_intel_cleanup_pdev(ctx);
kfree(ctx);
}
EXPORT_SYMBOL(sdw_intel_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Intel Soundwire Init Library");