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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
/*
* SoundWire AMD Manager Initialize routines
*
* Initializes and creates SDW devices based on ACPI and Hardware values
*
* Copyright 2024 Advanced Micro Devices, Inc.
*/
#include <linux/acpi.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include "amd_init.h"
static int sdw_amd_cleanup(struct sdw_amd_ctx *ctx)
{
int i;
for (i = 0; i < ctx->count; i++) {
if (!(ctx->link_mask & BIT(i)))
continue;
platform_device_unregister(ctx->pdev[i]);
}
return 0;
}
static struct sdw_amd_ctx *sdw_amd_probe_controller(struct sdw_amd_res *res)
{
struct sdw_amd_ctx *ctx;
struct acpi_device *adev;
struct resource *sdw_res;
struct acp_sdw_pdata sdw_pdata[2];
struct platform_device_info pdevinfo[2];
u32 link_mask;
int count, index;
if (!res)
return NULL;
adev = acpi_fetch_acpi_dev(res->handle);
if (!adev)
return NULL;
if (!res->count)
return NULL;
count = res->count;
dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
/*
* we need to alloc/free memory manually and can't use devm:
* this routine may be called from a workqueue, and not from
* the parent .probe.
* If devm_ was used, the memory might never be freed on errors.
*/
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;
ctx->count = count;
ctx->link_mask = res->link_mask;
sdw_res = kzalloc(sizeof(*sdw_res), GFP_KERNEL);
if (!sdw_res) {
kfree(ctx);
return NULL;
}
sdw_res->flags = IORESOURCE_MEM;
sdw_res->start = res->addr;
sdw_res->end = res->addr + res->reg_range;
memset(&pdevinfo, 0, sizeof(pdevinfo));
link_mask = ctx->link_mask;
for (index = 0; index < count; index++) {
if (!(link_mask & BIT(index)))
continue;
sdw_pdata[index].instance = index;
sdw_pdata[index].acp_sdw_lock = res->acp_lock;
pdevinfo[index].name = "amd_sdw_manager";
pdevinfo[index].id = index;
pdevinfo[index].parent = res->parent;
pdevinfo[index].num_res = 1;
pdevinfo[index].res = sdw_res;
pdevinfo[index].data = &sdw_pdata[index];
pdevinfo[index].size_data = sizeof(struct acp_sdw_pdata);
pdevinfo[index].fwnode = acpi_fwnode_handle(adev);
ctx->pdev[index] = platform_device_register_full(&pdevinfo[index]);
if (IS_ERR(ctx->pdev[index]))
goto err;
}
kfree(sdw_res);
return ctx;
err:
while (index--) {
if (!(link_mask & BIT(index)))
continue;
platform_device_unregister(ctx->pdev[index]);
}
kfree(sdw_res);
kfree(ctx);
return NULL;
}
static int sdw_amd_startup(struct sdw_amd_ctx *ctx)
{
struct amd_sdw_manager *amd_manager;
int i, ret;
/* Startup SDW Manager devices */
for (i = 0; i < ctx->count; i++) {
if (!(ctx->link_mask & BIT(i)))
continue;
amd_manager = dev_get_drvdata(&ctx->pdev[i]->dev);
ret = amd_sdw_manager_start(amd_manager);
if (ret)
return ret;
}
return 0;
}
int sdw_amd_probe(struct sdw_amd_res *res, struct sdw_amd_ctx **sdw_ctx)
{
*sdw_ctx = sdw_amd_probe_controller(res);
if (!*sdw_ctx)
return -ENODEV;
return sdw_amd_startup(*sdw_ctx);
}
EXPORT_SYMBOL_NS(sdw_amd_probe, SOUNDWIRE_AMD_INIT);
void sdw_amd_exit(struct sdw_amd_ctx *ctx)
{
sdw_amd_cleanup(ctx);
kfree(ctx->ids);
kfree(ctx);
}
EXPORT_SYMBOL_NS(sdw_amd_exit, SOUNDWIRE_AMD_INIT);
MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
MODULE_DESCRIPTION("AMD SoundWire Init Library");
MODULE_LICENSE("Dual BSD/GPL");
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