Date:   Thu, 21 Jul 2022 09:53:44 +0800
From:   Shengjiu Wang <shengjiu.wang@....com>
To:     pierre-louis.bossart@...ux.intel.com, lgirdwood@...il.com,
        peter.ujfalusi@...ux.intel.com, yung-chuan.liao@...ux.intel.com,
        ranjani.sridharan@...ux.intel.com, kai.vehmanen@...ux.intel.com,
        daniel.baluta@....com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        devicetree@...r.kernel.org
Cc:     shengjiu.wang@...il.com, linux-kernel@...r.kernel.org,
        sound-open-firmware@...a-project.org, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 2/2] ASoC: SOF: imx: Add i.MX8ULP HW support

From: Zhang Peng <peng.zhang_8@....com>

This adds skeleton support for the audio DSP hardware found on
NXP i.MX8ULP platform.

On i.MX8ULP resources (clocks, power, etc) are managed by the
System Integration Module in LPAV domain and XRDC which is handled
by arm trusted firmware.

Signed-off-by: Zhang Peng <peng.zhang_8@....com>
Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
changes in v2:
- Add arm-smccc.h and use snd_sof_ipc_process_reply()
- Address review comments

 sound/soc/sof/imx/Kconfig   |   9 +
 sound/soc/sof/imx/Makefile  |   2 +
 sound/soc/sof/imx/imx8ulp.c | 514 ++++++++++++++++++++++++++++++++++++
 3 files changed, 525 insertions(+)
 create mode 100644 sound/soc/sof/imx/imx8ulp.c

diff --git a/sound/soc/sof/imx/Kconfig b/sound/soc/sof/imx/Kconfig
index cc6e695f913a..4751b04d5e6f 100644
--- a/sound/soc/sof/imx/Kconfig
+++ b/sound/soc/sof/imx/Kconfig
@@ -41,4 +41,13 @@ config SND_SOC_SOF_IMX8M
 	  Say Y if you have such a device.
 	  If unsure select "N".
 
+config SND_SOC_SOF_IMX8ULP
+	tristate "SOF support for i.MX8ULP"
+	depends on IMX_DSP
+	select SND_SOC_SOF_IMX_COMMON
+	help
+	  This adds support for Sound Open Firmware for NXP i.MX8ULP platforms.
+	  Say Y if you have such a device.
+	  If unsure select "N".
+
 endif ## SND_SOC_SOF_IMX_TOPLEVEL
diff --git a/sound/soc/sof/imx/Makefile b/sound/soc/sof/imx/Makefile
index dba93c3466ec..798b43a415bf 100644
--- a/sound/soc/sof/imx/Makefile
+++ b/sound/soc/sof/imx/Makefile
@@ -1,9 +1,11 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
 snd-sof-imx8-objs := imx8.o
 snd-sof-imx8m-objs := imx8m.o
+snd-sof-imx8ulp-objs := imx8ulp.o
 
 snd-sof-imx-common-objs := imx-common.o
 
 obj-$(CONFIG_SND_SOC_SOF_IMX8) += snd-sof-imx8.o
 obj-$(CONFIG_SND_SOC_SOF_IMX8M) += snd-sof-imx8m.o
+obj-$(CONFIG_SND_SOC_SOF_IMX8ULP) += snd-sof-imx8ulp.o
 obj-$(CONFIG_SND_SOC_SOF_IMX_COMMON) += imx-common.o
diff --git a/sound/soc/sof/imx/imx8ulp.c b/sound/soc/sof/imx/imx8ulp.c
new file mode 100644
index 000000000000..02b496165acc
--- /dev/null
+++ b/sound/soc/sof/imx/imx8ulp.c
@@ -0,0 +1,514 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+//
+// Copyright 2021-2022 NXP
+//
+// Author: Peng Zhang <peng.zhang_8@....com>
+//
+// Hardware interface for audio DSP on i.MX8ULP
+
+#include <linux/arm-smccc.h>
+#include <linux/clk.h>
+#include <linux/firmware.h>
+#include <linux/firmware/imx/dsp.h>
+#include <linux/firmware/imx/ipc.h>
+#include <linux/firmware/imx/svc/misc.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
+
+#include <sound/sof.h>
+#include <sound/sof/xtensa.h>
+
+#include "../ops.h"
+#include "../sof-of-dev.h"
+#include "imx-common.h"
+
+#define FSL_SIP_HIFI_XRDC	0xc200000e
+
+/* SIM Domain register */
+#define SYSCTRL0		0x8
+#define EXECUTE_BIT		BIT(13)
+#define RESET_BIT		BIT(16)
+#define HIFI4_CLK_BIT		BIT(17)
+#define PB_CLK_BIT		BIT(18)
+#define PLAT_CLK_BIT		BIT(19)
+#define DEBUG_LOGIC_BIT		BIT(25)
+
+#define MBOX_OFFSET		0x800000
+#define MBOX_SIZE		0x1000
+
+static struct clk_bulk_data imx8ulp_dsp_clks[] = {
+	{ .id = "core" },
+	{ .id = "ipg" },
+	{ .id = "ocram" },
+	{ .id = "mu" },
+};
+
+struct imx8ulp_priv {
+	struct device *dev;
+	struct snd_sof_dev *sdev;
+
+	/* DSP IPC handler */
+	struct imx_dsp_ipc *dsp_ipc;
+	struct platform_device *ipc_dev;
+
+	struct regmap *regmap;
+	struct imx_clocks *clks;
+};
+
+static void imx8ulp_sim_lpav_start(struct imx8ulp_priv *priv)
+{
+	/* Controls the HiFi4 DSP Reset: 1 in reset, 0 out of reset */
+	regmap_update_bits(priv->regmap, SYSCTRL0, RESET_BIT, 0);
+
+	/* Reset HiFi4 DSP Debug logic: 1 debug reset, 0  out of reset*/
+	regmap_update_bits(priv->regmap, SYSCTRL0, DEBUG_LOGIC_BIT, 0);
+
+	/* Stall HIFI4 DSP Execution: 1 stall, 0 run */
+	regmap_update_bits(priv->regmap, SYSCTRL0, EXECUTE_BIT, 0);
+}
+
+static int imx8ulp_get_mailbox_offset(struct snd_sof_dev *sdev)
+{
+	return MBOX_OFFSET;
+}
+
+static int imx8ulp_get_window_offset(struct snd_sof_dev *sdev, u32 id)
+{
+	return MBOX_OFFSET;
+}
+
+static void imx8ulp_dsp_handle_reply(struct imx_dsp_ipc *ipc)
+{
+	struct imx8ulp_priv *priv = imx_dsp_get_data(ipc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->sdev->ipc_lock, flags);
+
+	snd_sof_ipc_process_reply(priv->sdev, 0);
+
+	spin_unlock_irqrestore(&priv->sdev->ipc_lock, flags);
+}
+
+static void imx8ulp_dsp_handle_request(struct imx_dsp_ipc *ipc)
+{
+	struct imx8ulp_priv *priv = imx_dsp_get_data(ipc);
+	u32 p; /* panic code */
+
+	/* Read the message from the debug box. */
+	sof_mailbox_read(priv->sdev, priv->sdev->debug_box.offset + 4, &p, sizeof(p));
+
+	/* Check to see if the message is a panic code (0x0dead***) */
+	if ((p & SOF_IPC_PANIC_MAGIC_MASK) == SOF_IPC_PANIC_MAGIC)
+		snd_sof_dsp_panic(priv->sdev, p, true);
+	else
+		snd_sof_ipc_msgs_rx(priv->sdev);
+}
+
+static struct imx_dsp_ops dsp_ops = {
+	.handle_reply		= imx8ulp_dsp_handle_reply,
+	.handle_request		= imx8ulp_dsp_handle_request,
+};
+
+static int imx8ulp_send_msg(struct snd_sof_dev *sdev, struct snd_sof_ipc_msg *msg)
+{
+	struct imx8ulp_priv *priv = sdev->pdata->hw_pdata;
+
+	sof_mailbox_write(sdev, sdev->host_box.offset, msg->msg_data,
+			  msg->msg_size);
+	imx_dsp_ring_doorbell(priv->dsp_ipc, 0);
+
+	return 0;
+}
+
+static int imx8ulp_run(struct snd_sof_dev *sdev)
+{
+	struct imx8ulp_priv *priv = sdev->pdata->hw_pdata;
+
+	imx8ulp_sim_lpav_start(priv);
+
+	return 0;
+}
+
+static int imx8ulp_reset(struct snd_sof_dev *sdev)
+{
+	struct imx8ulp_priv *priv = sdev->pdata->hw_pdata;
+	struct arm_smccc_res smc_resource;
+
+	/* HiFi4 Platform Clock Enable: 1 enabled, 0 disabled */
+	regmap_update_bits(priv->regmap, SYSCTRL0, PLAT_CLK_BIT, PLAT_CLK_BIT);
+
+	/* HiFi4 PBCLK clock enable: 1 enabled, 0 disabled */
+	regmap_update_bits(priv->regmap, SYSCTRL0, PB_CLK_BIT, PB_CLK_BIT);
+
+	/* HiFi4 Clock Enable: 1 enabled, 0 disabled */
+	regmap_update_bits(priv->regmap, SYSCTRL0, HIFI4_CLK_BIT, HIFI4_CLK_BIT);
+
+	regmap_update_bits(priv->regmap, SYSCTRL0, RESET_BIT, RESET_BIT);
+	usleep_range(1, 2);
+
+	/* Stall HIFI4 DSP Execution: 1 stall, 0 not stall */
+	regmap_update_bits(priv->regmap, SYSCTRL0, EXECUTE_BIT, EXECUTE_BIT);
+	usleep_range(1, 2);
+
+	arm_smccc_smc(FSL_SIP_HIFI_XRDC, 0, 0, 0, 0, 0, 0, 0, &smc_resource);
+
+	return 0;
+}
+
+static int imx8ulp_probe(struct snd_sof_dev *sdev)
+{
+	struct platform_device *pdev =
+		container_of(sdev->dev, struct platform_device, dev);
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *res_node;
+	struct resource *mmio;
+	struct imx8ulp_priv *priv;
+	struct resource res;
+	u32 base, size;
+	int ret = 0;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->clks = devm_kzalloc(&pdev->dev, sizeof(*priv->clks), GFP_KERNEL);
+	if (!priv->clks)
+		return -ENOMEM;
+
+	sdev->num_cores = 1;
+	sdev->pdata->hw_pdata = priv;
+	priv->dev = sdev->dev;
+	priv->sdev = sdev;
+
+	/* System integration module(SIM) control dsp configuration */
+	priv->regmap = syscon_regmap_lookup_by_phandle(np, "fsl,dsp-ctrl");
+	if (IS_ERR(priv->regmap))
+		return PTR_ERR(priv->regmap);
+
+	priv->ipc_dev = platform_device_register_data(sdev->dev, "imx-dsp",
+						      PLATFORM_DEVID_NONE,
+						      pdev, sizeof(*pdev));
+	if (IS_ERR(priv->ipc_dev))
+		return PTR_ERR(priv->ipc_dev);
+
+	priv->dsp_ipc = dev_get_drvdata(&priv->ipc_dev->dev);
+	if (!priv->dsp_ipc) {
+		/* DSP IPC driver not probed yet, try later */
+		ret = -EPROBE_DEFER;
+		dev_err(sdev->dev, "Failed to get drvdata\n");
+		goto exit_pdev_unregister;
+	}
+
+	imx_dsp_set_data(priv->dsp_ipc, priv);
+	priv->dsp_ipc->ops = &dsp_ops;
+
+	/* DSP base */
+	mmio = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (mmio) {
+		base = mmio->start;
+		size = resource_size(mmio);
+	} else {
+		dev_err(sdev->dev, "error: failed to get DSP base at idx 0\n");
+		ret = -EINVAL;
+		goto exit_pdev_unregister;
+	}
+
+	sdev->bar[SOF_FW_BLK_TYPE_IRAM] = devm_ioremap(sdev->dev, base, size);
+	if (!sdev->bar[SOF_FW_BLK_TYPE_IRAM]) {
+		dev_err(sdev->dev, "failed to ioremap base 0x%x size 0x%x\n",
+			base, size);
+		ret = -ENODEV;
+		goto exit_pdev_unregister;
+	}
+	sdev->mmio_bar = SOF_FW_BLK_TYPE_IRAM;
+
+	res_node = of_parse_phandle(np, "memory-reserved", 0);
+	if (!res_node) {
+		dev_err(&pdev->dev, "failed to get memory region node\n");
+		ret = -ENODEV;
+		goto exit_pdev_unregister;
+	}
+
+	ret = of_address_to_resource(res_node, 0, &res);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to get reserved region address\n");
+		goto exit_pdev_unregister;
+	}
+
+	sdev->bar[SOF_FW_BLK_TYPE_SRAM] = devm_ioremap_wc(sdev->dev, res.start,
+							  resource_size(&res));
+	if (!sdev->bar[SOF_FW_BLK_TYPE_SRAM]) {
+		dev_err(sdev->dev, "failed to ioremap mem 0x%x size 0x%x\n",
+			base, size);
+		ret = -ENOMEM;
+		goto exit_pdev_unregister;
+	}
+	sdev->mailbox_bar = SOF_FW_BLK_TYPE_SRAM;
+
+	/* set default mailbox offset for FW ready message */
+	sdev->dsp_box.offset = MBOX_OFFSET;
+
+	ret = of_reserved_mem_device_init(sdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to init reserved memory region %d\n", ret);
+		goto exit_pdev_unregister;
+	}
+
+	priv->clks->dsp_clks = imx8ulp_dsp_clks;
+	priv->clks->num_dsp_clks = ARRAY_SIZE(imx8ulp_dsp_clks);
+
+	ret = imx8_parse_clocks(sdev, priv->clks);
+	if (ret < 0)
+		goto exit_pdev_unregister;
+
+	ret = imx8_enable_clocks(sdev, priv->clks);
+	if (ret < 0)
+		goto exit_pdev_unregister;
+
+	return 0;
+
+exit_pdev_unregister:
+	platform_device_unregister(priv->ipc_dev);
+
+	return ret;
+}
+
+static int imx8ulp_remove(struct snd_sof_dev *sdev)
+{
+	struct imx8ulp_priv *priv = sdev->pdata->hw_pdata;
+
+	imx8_disable_clocks(sdev, priv->clks);
+	platform_device_unregister(priv->ipc_dev);
+
+	return 0;
+}
+
+/* on i.MX8 there is 1 to 1 match between type and BAR idx */
+static int imx8ulp_get_bar_index(struct snd_sof_dev *sdev, u32 type)
+{
+	return type;
+}
+
+static int imx8ulp_suspend(struct snd_sof_dev *sdev)
+{
+	int i;
+	struct imx8ulp_priv *priv = (struct imx8ulp_priv *)sdev->pdata->hw_pdata;
+
+	/*Stall DSP,  release in .run() */
+	regmap_update_bits(priv->regmap, SYSCTRL0, EXECUTE_BIT, EXECUTE_BIT);
+
+	for (i = 0; i < DSP_MU_CHAN_NUM; i++)
+		imx_dsp_free_channel(priv->dsp_ipc, i);
+
+	imx8_disable_clocks(sdev, priv->clks);
+
+	return 0;
+}
+
+static int imx8ulp_resume(struct snd_sof_dev *sdev)
+{
+	struct imx8ulp_priv *priv = (struct imx8ulp_priv *)sdev->pdata->hw_pdata;
+	int i;
+
+	imx8_enable_clocks(sdev, priv->clks);
+
+	for (i = 0; i < DSP_MU_CHAN_NUM; i++)
+		imx_dsp_request_channel(priv->dsp_ipc, i);
+
+	return 0;
+}
+
+static int imx8ulp_dsp_runtime_resume(struct snd_sof_dev *sdev)
+{
+	const struct sof_dsp_power_state target_dsp_state = {
+		.state = SOF_DSP_PM_D0,
+		.substate = 0,
+	};
+
+	imx8ulp_resume(sdev);
+
+	return snd_sof_dsp_set_power_state(sdev, &target_dsp_state);
+}
+
+static int imx8ulp_dsp_runtime_suspend(struct snd_sof_dev *sdev)
+{
+	const struct sof_dsp_power_state target_dsp_state = {
+		.state = SOF_DSP_PM_D3,
+		.substate = 0,
+	};
+
+	imx8ulp_suspend(sdev);
+
+	return snd_sof_dsp_set_power_state(sdev, &target_dsp_state);
+}
+
+static int imx8ulp_dsp_suspend(struct snd_sof_dev *sdev, unsigned int target_state)
+{
+	const struct sof_dsp_power_state target_dsp_state = {
+		.state = target_state,
+		.substate = 0,
+	};
+
+	if (!pm_runtime_suspended(sdev->dev))
+		imx8ulp_suspend(sdev);
+
+	return snd_sof_dsp_set_power_state(sdev, &target_dsp_state);
+}
+
+static int imx8ulp_dsp_resume(struct snd_sof_dev *sdev)
+{
+	const struct sof_dsp_power_state target_dsp_state = {
+		.state = SOF_DSP_PM_D0,
+		.substate = 0,
+	};
+
+	imx8ulp_resume(sdev);
+
+	if (pm_runtime_suspended(sdev->dev)) {
+		pm_runtime_disable(sdev->dev);
+		pm_runtime_set_active(sdev->dev);
+		pm_runtime_mark_last_busy(sdev->dev);
+		pm_runtime_enable(sdev->dev);
+		pm_runtime_idle(sdev->dev);
+	}
+
+	return snd_sof_dsp_set_power_state(sdev, &target_dsp_state);
+}
+
+static struct snd_soc_dai_driver imx8ulp_dai[] = {
+	{
+		.name = "sai5",
+		.playback = {
+			.channels_min = 1,
+			.channels_max = 32,
+		},
+		.capture = {
+			.channels_min = 1,
+			.channels_max = 32,
+		},
+	},
+	{
+		.name = "sai6",
+		.playback = {
+			.channels_min = 1,
+			.channels_max = 32,
+		},
+		.capture = {
+			.channels_min = 1,
+			.channels_max = 32,
+		},
+	},
+};
+
+static int imx8ulp_dsp_set_power_state(struct snd_sof_dev *sdev,
+				       const struct sof_dsp_power_state *target_state)
+{
+	sdev->dsp_power_state = *target_state;
+
+	return 0;
+}
+
+/* i.MX8 ops */
+struct snd_sof_dsp_ops sof_imx8ulp_ops = {
+	/* probe and remove */
+	.probe		= imx8ulp_probe,
+	.remove		= imx8ulp_remove,
+	/* DSP core boot */
+	.run		= imx8ulp_run,
+	.reset		= imx8ulp_reset,
+
+	/* Block IO */
+	.block_read	= sof_block_read,
+	.block_write	= sof_block_write,
+
+	/* Module IO */
+	.read64		= sof_io_read64,
+
+	/* Mailbox IO */
+	.mailbox_read	= sof_mailbox_read,
+	.mailbox_write	= sof_mailbox_write,
+
+	/* ipc */
+	.send_msg	= imx8ulp_send_msg,
+	.get_mailbox_offset	= imx8ulp_get_mailbox_offset,
+	.get_window_offset	= imx8ulp_get_window_offset,
+
+	.ipc_msg_data	= sof_ipc_msg_data,
+	.set_stream_data_offset = sof_set_stream_data_offset,
+
+	/* stream callbacks */
+	.pcm_open	= sof_stream_pcm_open,
+	.pcm_close	= sof_stream_pcm_close,
+
+	/* module loading */
+	.get_bar_index	= imx8ulp_get_bar_index,
+	/* firmware loading */
+	.load_firmware	= snd_sof_load_firmware_memcpy,
+
+	/* Debug information */
+	.dbg_dump	= imx8_dump,
+
+	/* Firmware ops */
+	.dsp_arch_ops	= &sof_xtensa_arch_ops,
+
+	/* DAI drivers */
+	.drv		= imx8ulp_dai,
+	.num_drv	= ARRAY_SIZE(imx8ulp_dai),
+
+	/* ALSA HW info flags */
+	.hw_info	= SNDRV_PCM_INFO_MMAP |
+			SNDRV_PCM_INFO_MMAP_VALID |
+			SNDRV_PCM_INFO_INTERLEAVED |
+			SNDRV_PCM_INFO_PAUSE |
+			SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
+
+	/* PM */
+	.runtime_suspend	= imx8ulp_dsp_runtime_suspend,
+	.runtime_resume		= imx8ulp_dsp_runtime_resume,
+
+	.suspend	= imx8ulp_dsp_suspend,
+	.resume		= imx8ulp_dsp_resume,
+
+	.set_power_state	= imx8ulp_dsp_set_power_state,
+};
+
+static struct sof_dev_desc sof_of_imx8ulp_desc = {
+	.ipc_supported_mask     = BIT(SOF_IPC),
+	.ipc_default            = SOF_IPC,
+	.default_fw_path = {
+		[SOF_IPC] = "imx/sof",
+	},
+	.default_tplg_path = {
+		[SOF_IPC] = "imx/sof-tplg",
+	},
+	.default_fw_filename = {
+		[SOF_IPC] = "sof-imx8ulp.ri",
+	},
+	.nocodec_tplg_filename = "sof-imx8ulp-nocodec.tplg",
+	.ops = &sof_imx8ulp_ops,
+};
+
+static const struct of_device_id sof_of_imx8ulp_ids[] = {
+	{ .compatible = "fsl,imx8ulp-dsp", .data = &sof_of_imx8ulp_desc},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sof_of_imx8ulp_ids);
+
+/* DT driver definition */
+static struct platform_driver snd_sof_of_imx8ulp_driver = {
+	.probe = sof_of_probe,
+	.remove = sof_of_remove,
+	.driver = {
+		.name = "sof-audio-of-imx8ulp",
+		.pm = &sof_of_pm,
+		.of_match_table = sof_of_imx8ulp_ids,
+	},
+};
+module_platform_driver(snd_sof_of_imx8ulp_driver);
+
+MODULE_IMPORT_NS(SND_SOC_SOF_XTENSA);
+MODULE_LICENSE("Dual BSD/GPL");
-- 
2.34.1

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