Merging upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 235 insertions, 0 deletions

diff --git a/drivers/soundwire/amd_init.c b/drivers/soundwire/amd_init.c
new file mode 100644
index 0000000000..e45dc8261a
--- /dev/null
+++ b/drivers/soundwire/amd_init.c
@@ -0,0 +1,235 @@
+// 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"
+
+#define ACP_PAD_PULLDOWN_CTRL				0x0001448
+#define ACP_SW_PAD_KEEPER_EN				0x0001454
+#define AMD_SDW_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7f9a
+#define AMD_SDW0_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7f9f
+#define AMD_SDW1_PAD_PULLDOWN_CTRL_ENABLE_MASK		0x7ffa
+#define AMD_SDW0_PAD_EN_MASK				1
+#define AMD_SDW1_PAD_EN_MASK				0x10
+#define AMD_SDW_PAD_EN_MASK	(AMD_SDW0_PAD_EN_MASK | AMD_SDW1_PAD_EN_MASK)
+
+static int amd_enable_sdw_pads(void __iomem *mmio, u32 link_mask, struct device *dev)
+{
+	u32 val;
+	u32 pad_keeper_en_mask, pad_pulldown_ctrl_mask;
+
+	switch (link_mask) {
+	case 1:
+		pad_keeper_en_mask = AMD_SDW0_PAD_EN_MASK;
+		pad_pulldown_ctrl_mask = AMD_SDW0_PAD_PULLDOWN_CTRL_ENABLE_MASK;
+		break;
+	case 2:
+		pad_keeper_en_mask = AMD_SDW1_PAD_EN_MASK;
+		pad_pulldown_ctrl_mask = AMD_SDW1_PAD_PULLDOWN_CTRL_ENABLE_MASK;
+		break;
+	case 3:
+		pad_keeper_en_mask = AMD_SDW_PAD_EN_MASK;
+		pad_pulldown_ctrl_mask = AMD_SDW_PAD_PULLDOWN_CTRL_ENABLE_MASK;
+		break;
+	default:
+		dev_err(dev, "No SDW Links are enabled\n");
+		return -ENODEV;
+	}
+
+	val = readl(mmio + ACP_SW_PAD_KEEPER_EN);
+	val |= pad_keeper_en_mask;
+	writel(val, mmio + ACP_SW_PAD_KEEPER_EN);
+	val = readl(mmio + ACP_PAD_PULLDOWN_CTRL);
+	val &= pad_pulldown_ctrl_mask;
+	writel(val, mmio + ACP_PAD_PULLDOWN_CTRL);
+	return 0;
+}
+
+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;
+	int ret;
+
+	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);
+	ret = amd_enable_sdw_pads(res->mmio_base, res->link_mask, res->parent);
+	if (ret)
+		return NULL;
+
+	/*
+	 * 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);
+
+int sdw_amd_get_slave_info(struct sdw_amd_ctx *ctx)
+{
+	struct amd_sdw_manager *amd_manager;
+	struct sdw_bus *bus;
+	struct sdw_slave *slave;
+	struct list_head *node;
+	int index;
+	int i = 0;
+	int num_slaves = 0;
+
+	for (index = 0; index < ctx->count; index++) {
+		if (!(ctx->link_mask & BIT(index)))
+			continue;
+		amd_manager = dev_get_drvdata(&ctx->pdev[index]->dev);
+		if (!amd_manager)
+			return -ENODEV;
+		bus = &amd_manager->bus;
+		/* Calculate number of slaves */
+		list_for_each(node, &bus->slaves)
+			num_slaves++;
+	}
+
+	ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL);
+	if (!ctx->ids)
+		return -ENOMEM;
+	ctx->num_slaves = num_slaves;
+	for (index = 0; index < ctx->count; index++) {
+		if (!(ctx->link_mask & BIT(index)))
+			continue;
+		amd_manager = dev_get_drvdata(&ctx->pdev[index]->dev);
+		if (amd_manager) {
+			bus = &amd_manager->bus;
+			list_for_each_entry(slave, &bus->slaves, node) {
+				ctx->ids[i].id = slave->id;
+				ctx->ids[i].link_id = bus->link_id;
+				i++;
+			}
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_NS(sdw_amd_get_slave_info, SOUNDWIRE_AMD_INIT);
+
+MODULE_AUTHOR("Vijendar.Mukunda@amd.com");
+MODULE_DESCRIPTION("AMD SoundWire Init Library");
+MODULE_LICENSE("Dual BSD/GPL");