soundwire/SOF: add SoundWire Interface support for AMD SOF stack

drivers/soundwire/Makefile

@@ -20,7 +20,7 @@ soundwire-bus-y += irq.o
 endif
 
 #AMD driver
-soundwire-amd-y :=	amd_manager.o
+soundwire-amd-y := amd_init.o amd_manager.o
 obj-$(CONFIG_SOUNDWIRE_AMD) += soundwire-amd.o
 
 #Cadence Objs

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 2023 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");

drivers/soundwire/amd_init.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
+/*
+ * Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.
+ */
+
+#ifndef __AMD_INIT_H
+#define __AMD_INIT_H
+
+#include <linux/soundwire/sdw_amd.h>
+
+int amd_sdw_manager_start(struct amd_sdw_manager *amd_manager);
+
+#endif

drivers/soundwire/amd_manager.c

@@ -19,29 +19,13 @@
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include "bus.h"
+#include "amd_init.h"
 #include "amd_manager.h"
 
 #define DRV_NAME "amd_sdw_manager"
 
 #define to_amd_sdw(b)	container_of(b, struct amd_sdw_manager, bus)
 
-static void amd_enable_sdw_pads(struct amd_sdw_manager *amd_manager)
-{
-	u32 sw_pad_pulldown_val;
-	u32 val;
-
-	mutex_lock(amd_manager->acp_sdw_lock);
-	val = readl(amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
-	val |= amd_manager->reg_mask->sw_pad_enable_mask;
-	writel(val, amd_manager->acp_mmio + ACP_SW_PAD_KEEPER_EN);
-	usleep_range(1000, 1500);
-
-	sw_pad_pulldown_val = readl(amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
-	sw_pad_pulldown_val &= amd_manager->reg_mask->sw_pad_pulldown_mask;
-	writel(sw_pad_pulldown_val, amd_manager->acp_mmio + ACP_PAD_PULLDOWN_CTRL);
-	mutex_unlock(amd_manager->acp_sdw_lock);
-}
-
 static int amd_init_sdw_manager(struct amd_sdw_manager *amd_manager)
 {
 	u32 val;
@@ -102,12 +86,11 @@ static int amd_disable_sdw_manager(struct amd_sdw_manager *amd_manager)
 
 static void amd_enable_sdw_interrupts(struct amd_sdw_manager *amd_manager)
 {
-	struct sdw_manager_reg_mask *reg_mask = amd_manager->reg_mask;
 	u32 val;
 
 	mutex_lock(amd_manager->acp_sdw_lock);
 	val = readl(amd_manager->acp_mmio + ACP_EXTERNAL_INTR_CNTL(amd_manager->instance));
-	val |= reg_mask->acp_sdw_intr_mask;
+	val |= sdw_manager_reg_mask_array[amd_manager->instance];
 	writel(val, amd_manager->acp_mmio + ACP_EXTERNAL_INTR_CNTL(amd_manager->instance));
 	mutex_unlock(amd_manager->acp_sdw_lock);
 
@@ -120,12 +103,11 @@ static void amd_enable_sdw_interrupts(struct amd_sdw_manager *amd_manager)
 
 static void amd_disable_sdw_interrupts(struct amd_sdw_manager *amd_manager)
 {
-	struct sdw_manager_reg_mask *reg_mask = amd_manager->reg_mask;
 	u32 val;
 
 	mutex_lock(amd_manager->acp_sdw_lock);
 	val = readl(amd_manager->acp_mmio + ACP_EXTERNAL_INTR_CNTL(amd_manager->instance));
-	val &= ~reg_mask->acp_sdw_intr_mask;
+	val &= ~sdw_manager_reg_mask_array[amd_manager->instance];
 	writel(val, amd_manager->acp_mmio + ACP_EXTERNAL_INTR_CNTL(amd_manager->instance));
 	mutex_unlock(amd_manager->acp_sdw_lock);
 
@@ -864,23 +846,20 @@ static void amd_sdw_irq_thread(struct work_struct *work)
 	writel(0x00, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_0TO7);
 }
 
-static void amd_sdw_probe_work(struct work_struct *work)
+int amd_sdw_manager_start(struct amd_sdw_manager *amd_manager)
 {
-	struct amd_sdw_manager *amd_manager = container_of(work, struct amd_sdw_manager,
-							   probe_work);
 	struct sdw_master_prop *prop;
 	int ret;
 
 	prop = &amd_manager->bus.prop;
 	if (!prop->hw_disabled) {
-		amd_enable_sdw_pads(amd_manager);
 		ret = amd_init_sdw_manager(amd_manager);
 		if (ret)
-			return;
+			return ret;
 		amd_enable_sdw_interrupts(amd_manager);
 		ret = amd_enable_sdw_manager(amd_manager);
 		if (ret)
-			return;
+			return ret;
 		amd_sdw_set_frameshape(amd_manager);
 	}
 	/* Enable runtime PM */
@@ -889,6 +868,7 @@ static void amd_sdw_probe_work(struct work_struct *work)
 	pm_runtime_mark_last_busy(amd_manager->dev);
 	pm_runtime_set_active(amd_manager->dev);
 	pm_runtime_enable(amd_manager->dev);
+	return 0;
 }
 
 static int amd_sdw_manager_probe(struct platform_device *pdev)
@@ -948,7 +928,6 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	amd_manager->reg_mask = &sdw_manager_reg_mask_array[amd_manager->instance];
 	params = &amd_manager->bus.params;
 	params->max_dr_freq = AMD_SDW_DEFAULT_CLK_FREQ * 2;
 	params->curr_dr_freq = AMD_SDW_DEFAULT_CLK_FREQ * 2;
@@ -972,11 +951,6 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
 	dev_set_drvdata(dev, amd_manager);
 	INIT_WORK(&amd_manager->amd_sdw_irq_thread, amd_sdw_irq_thread);
 	INIT_WORK(&amd_manager->amd_sdw_work, amd_sdw_update_slave_status_work);
-	INIT_WORK(&amd_manager->probe_work, amd_sdw_probe_work);
-	/*
-	 * Instead of having lengthy probe sequence, use deferred probe.
-	 */
-	schedule_work(&amd_manager->probe_work);
 	return 0;
 }
 
@@ -986,7 +960,6 @@ static void amd_sdw_manager_remove(struct platform_device *pdev)
 	int ret;
 
 	pm_runtime_disable(&pdev->dev);
-	cancel_work_sync(&amd_manager->probe_work);
 	amd_disable_sdw_interrupts(amd_manager);
 	sdw_bus_master_delete(&amd_manager->bus);
 	ret = amd_disable_sdw_manager(amd_manager);

drivers/soundwire/amd_manager.h

@@ -243,16 +243,8 @@ static struct sdw_manager_dp_reg sdw1_manager_dp_reg[AMD_SDW1_MAX_DAI] =  {
 	 ACP_SW_AUDIO1_RX_OFFSET, ACP_SW_AUDIO1_RX_CHANNEL_ENABLE_DP0}
 };
 
-static struct sdw_manager_reg_mask sdw_manager_reg_mask_array[2] =  {
-	{
-		AMD_SDW0_PAD_KEEPER_EN_MASK,
-		AMD_SDW0_PAD_PULLDOWN_CTRL_ENABLE_MASK,
-		AMD_SDW0_EXT_INTR_MASK
-	},
-	{
-		AMD_SDW1_PAD_KEEPER_EN_MASK,
-		AMD_SDW1_PAD_PULLDOWN_CTRL_ENABLE_MASK,
+static u32 sdw_manager_reg_mask_array[AMD_SDW_MAX_MANAGER_COUNT] =  {
+		AMD_SDW0_EXT_INTR_MASK,
 		AMD_SDW1_EXT_INTR_MASK
-	}
 };
 #endif