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6f7219fecf
No need for an "else" after a "return" statement. Remove multiple such occurrences in Intel-specific code. Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com> Link: https://lore.kernel.org/r/20200508003046.23162-3-guennadi.liakhovetski@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
224 lines
5.1 KiB
C
224 lines
5.1 KiB
C
// 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/export.h>
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#include <linux/io.h>
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#include <linux/module.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_LINK_TYPE 4 /* from Intel ACPI documentation */
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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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static int link_mask;
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module_param_named(sdw_link_mask, link_mask, int, 0444);
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MODULE_PARM_DESC(sdw_link_mask, "Intel link mask (one bit per link)");
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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_intel_link_res *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_intel_link_res *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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caps &= GENMASK(2, 0);
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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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if (!count) {
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dev_warn(&adev->dev, "No SoundWire links detected\n");
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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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if (link_mask && !(link_mask & BIT(i))) {
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dev_dbg(&adev->dev,
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"Link %d masked, will not be enabled\n", i);
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link++;
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continue;
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}
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link->registers = res->mmio_base + SDW_LINK_BASE
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+ (SDW_LINK_SIZE * i);
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link->shim = res->mmio_base + SDW_SHIM_BASE;
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link->alh = res->mmio_base + SDW_ALH_BASE;
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link->ops = res->ops;
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link->dev = res->dev;
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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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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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acpi_status status;
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u64 adr;
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status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
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if (ACPI_FAILURE(status))
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return AE_OK; /* keep going */
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if (acpi_bus_get_device(handle, &adev)) {
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pr_err("%s: Couldn't find ACPI handle\n", __func__);
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return AE_NOT_FOUND;
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}
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res->handle = handle;
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/*
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* On some Intel platforms, multiple children of the HDAS
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* device can be found, but only one of them is the SoundWire
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* controller. The SNDW device is always exposed with
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* Name(_ADR, 0x40000000), with bits 31..28 representing the
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* SoundWire link so filter accordingly
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*/
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if ((adr & GENMASK(31, 28)) >> 28 != SDW_LINK_TYPE)
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return AE_OK; /* keep going */
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/* device found, stop namespace walk */
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return AE_CTRL_TERMINATE;
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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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/**
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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(struct sdw_intel_ctx *ctx)
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{
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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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