soundwire: intel: Add Intel init module
The SoundWire Master is implemented as part of Audio controller in Intel platforms. Add a init module which creates SoundWire Master platform devices based on the links supported in the hardware. Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -13,3 +13,6 @@ obj-$(CONFIG_SOUNDWIRE_CADENCE) += soundwire-cadence.o
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#Intel driver
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soundwire-intel-objs := intel.o
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obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel.o
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soundwire-intel-init-objs := intel_init.o
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obj-$(CONFIG_SOUNDWIRE_INTEL) += soundwire-intel-init.o
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198
drivers/soundwire/intel_init.c
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198
drivers/soundwire/intel_init.c
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@ -0,0 +1,198 @@
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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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// Copyright(c) 2015-17 Intel Corporation.
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/*
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* SDW Intel Init Routines
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*
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* Initializes and creates SDW devices based on ACPI and Hardware values
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*/
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#include <linux/soundwire/sdw_intel.h>
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#include "intel.h"
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#define SDW_MAX_LINKS 4
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#define SDW_SHIM_LCAP 0x0
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#define SDW_SHIM_BASE 0x2C000
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#define SDW_ALH_BASE 0x2C800
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#define SDW_LINK_BASE 0x30000
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#define SDW_LINK_SIZE 0x10000
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struct sdw_link_data {
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struct sdw_intel_link_res res;
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struct platform_device *pdev;
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};
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struct sdw_intel_ctx {
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int count;
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struct sdw_link_data *links;
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};
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static int sdw_intel_cleanup_pdev(struct sdw_intel_ctx *ctx)
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{
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struct sdw_link_data *link = ctx->links;
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int i;
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if (!link)
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return 0;
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for (i = 0; i < ctx->count; i++) {
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if (link->pdev)
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platform_device_unregister(link->pdev);
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link++;
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}
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kfree(ctx->links);
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ctx->links = NULL;
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return 0;
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}
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static struct sdw_intel_ctx
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*sdw_intel_add_controller(struct sdw_intel_res *res)
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{
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struct platform_device_info pdevinfo;
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struct platform_device *pdev;
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struct sdw_link_data *link;
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struct sdw_intel_ctx *ctx;
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struct acpi_device *adev;
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int ret, i;
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u8 count;
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u32 caps;
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if (acpi_bus_get_device(res->handle, &adev))
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return NULL;
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/* Found controller, find links supported */
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count = 0;
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ret = fwnode_property_read_u8_array(acpi_fwnode_handle(adev),
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"mipi-sdw-master-count", &count, 1);
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/* Don't fail on error, continue and use hw value */
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if (ret) {
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dev_err(&adev->dev,
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"Failed to read mipi-sdw-master-count: %d\n", ret);
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count = SDW_MAX_LINKS;
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}
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/* Check SNDWLCAP.LCOUNT */
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caps = ioread32(res->mmio_base + SDW_SHIM_BASE + SDW_SHIM_LCAP);
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/* Check HW supported vs property value and use min of two */
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count = min_t(u8, caps, count);
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/* Check count is within bounds */
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if (count > SDW_MAX_LINKS) {
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dev_err(&adev->dev, "Link count %d exceeds max %d\n",
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count, SDW_MAX_LINKS);
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return NULL;
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}
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dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return NULL;
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ctx->count = count;
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ctx->links = kcalloc(ctx->count, sizeof(*ctx->links), GFP_KERNEL);
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if (!ctx->links)
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goto link_err;
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link = ctx->links;
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/* Create SDW Master devices */
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for (i = 0; i < count; i++) {
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link->res.irq = res->irq;
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link->res.registers = res->mmio_base + SDW_LINK_BASE
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+ (SDW_LINK_SIZE * i);
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link->res.shim = res->mmio_base + SDW_SHIM_BASE;
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link->res.alh = res->mmio_base + SDW_ALH_BASE;
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memset(&pdevinfo, 0, sizeof(pdevinfo));
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pdevinfo.parent = res->parent;
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pdevinfo.name = "int-sdw";
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pdevinfo.id = i;
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pdevinfo.fwnode = acpi_fwnode_handle(adev);
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pdevinfo.data = &link->res;
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pdevinfo.size_data = sizeof(link->res);
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pdev = platform_device_register_full(&pdevinfo);
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if (IS_ERR(pdev)) {
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dev_err(&adev->dev,
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"platform device creation failed: %ld\n",
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PTR_ERR(pdev));
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goto pdev_err;
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}
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link->pdev = pdev;
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link++;
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}
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return ctx;
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pdev_err:
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sdw_intel_cleanup_pdev(ctx);
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link_err:
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kfree(ctx);
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return NULL;
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}
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static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
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void *cdata, void **return_value)
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{
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struct sdw_intel_res *res = cdata;
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struct acpi_device *adev;
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if (acpi_bus_get_device(handle, &adev)) {
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dev_err(&adev->dev, "Couldn't find ACPI handle\n");
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return AE_NOT_FOUND;
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}
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res->handle = handle;
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return AE_OK;
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}
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/**
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* sdw_intel_init() - SoundWire Intel init routine
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* @parent_handle: ACPI parent handle
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* @res: resource data
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*
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* This scans the namespace and creates SoundWire link controller devices
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* based on the info queried.
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*/
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void *sdw_intel_init(acpi_handle *parent_handle, struct sdw_intel_res *res)
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{
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acpi_status status;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
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parent_handle, 1,
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sdw_intel_acpi_cb,
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NULL, res, NULL);
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if (ACPI_FAILURE(status))
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return NULL;
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return sdw_intel_add_controller(res);
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}
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EXPORT_SYMBOL(sdw_intel_init);
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/**
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* sdw_intel_exit() - SoundWire Intel exit
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* @arg: callback context
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*
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* Delete the controller instances created and cleanup
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*/
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void sdw_intel_exit(void *arg)
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{
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struct sdw_intel_ctx *ctx = arg;
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sdw_intel_cleanup_pdev(ctx);
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kfree(ctx);
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}
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EXPORT_SYMBOL(sdw_intel_exit);
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_DESCRIPTION("Intel Soundwire Init Library");
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@ -18,4 +18,7 @@ struct sdw_intel_res {
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struct device *parent;
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};
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void *sdw_intel_init(acpi_handle *parent_handle, struct sdw_intel_res *res);
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void sdw_intel_exit(void *arg);
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#endif
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