diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/soundwire/intel_init.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c new file mode 100644 index 000000000..5c8a20d99 --- /dev/null +++ b/drivers/soundwire/intel_init.c @@ -0,0 +1,201 @@ +// 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/platform_device.h> +#include <linux/soundwire/sdw_intel.h> +#include "intel.h" + +#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 + +struct sdw_link_data { + struct sdw_intel_link_res res; + struct platform_device *pdev; +}; + +struct sdw_intel_ctx { + int count; + struct sdw_link_data *links; +}; + +static int sdw_intel_cleanup_pdev(struct sdw_intel_ctx *ctx) +{ + struct sdw_link_data *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; + struct sdw_link_data *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); + + /* 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; + } + + 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++) { + + link->res.irq = res->irq; + link->res.registers = res->mmio_base + SDW_LINK_BASE + + (SDW_LINK_SIZE * i); + link->res.shim = res->mmio_base + SDW_SHIM_BASE; + link->res.alh = res->mmio_base + SDW_ALH_BASE; + + link->res.ops = res->ops; + link->res.arg = res->arg; + + memset(&pdevinfo, 0, sizeof(pdevinfo)); + + pdevinfo.parent = res->parent; + pdevinfo.name = "int-sdw"; + pdevinfo.id = i; + pdevinfo.fwnode = acpi_fwnode_handle(adev); + pdevinfo.data = &link->res; + pdevinfo.size_data = sizeof(link->res); + + 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; + + if (acpi_bus_get_device(handle, &adev)) { + pr_err("%s: Couldn't find ACPI handle\n", __func__); + return AE_NOT_FOUND; + } + + res->handle = handle; + return AE_OK; +} + +/** + * 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); +} +EXPORT_SYMBOL(sdw_intel_init); + +/** + * sdw_intel_exit() - SoundWire Intel exit + * @arg: callback context + * + * Delete the controller instances created and cleanup + */ +void sdw_intel_exit(void *arg) +{ + struct sdw_intel_ctx *ctx = arg; + + sdw_intel_cleanup_pdev(ctx); + kfree(ctx); +} +EXPORT_SYMBOL(sdw_intel_exit); + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_DESCRIPTION("Intel Soundwire Init Library"); |