ASoC: SOF: imx: add driver for the imx95 chip

Add SOF support for the imx95 chip. Although the support is just
for the imx95 chip, the driver is intended for all chips in the imx9
family.

Note that the imx95 support could have just as easily been added
to the imx8 platform driver but a new platform driver was created
because the intention is to keep the families in separate drivers.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

Author: LaurentiuM1234

sound/soc/sof/imx/Kconfig

@@ -32,4 +32,13 @@ config SND_SOC_SOF_IMX8
 	  Say Y if you have such a device.
 	  If unsure select "N".
 
+config SND_SOC_SOF_IMX9
+	tristate "SOF support for i.MX9"
+	depends on IMX_DSP
+	select SND_SOC_SOF_IMX_COMMON
+	help
+	  This adds support for Sound Open Firmware for NXP i.MX9 platforms.
+	  Say Y if you need such a device.
+	  If unsure select "N".
+
 endif ## SND_SOC_SOF_IMX_TOPLEVEL

sound/soc/sof/imx/Makefile

@@ -1,7 +1,9 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
 snd-sof-imx8-y := imx8.o
+snd-sof-imx9-y := imx9.o
 
 snd-sof-imx-common-y := imx-common.o
 
 obj-$(CONFIG_SND_SOC_SOF_IMX8) += snd-sof-imx8.o
+obj-$(CONFIG_SND_SOC_SOF_IMX9) += snd-sof-imx9.o
 obj-$(CONFIG_SND_SOC_SOF_IMX_COMMON) += imx-common.o

sound/soc/sof/imx/imx9.c

@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+/*
+ * Copyright 2025 NXP
+ */
+
+#include <linux/arm-smccc.h>
+
+#include "imx-common.h"
+
+#define IMX_SIP_SRC 0xC2000005
+#define IMX_SIP_SRC_M_RESET_ADDR_SET 0x03
+
+#define IMX95_CPU_VEC_FLAGS_BOOT BIT(29)
+
+#define IMX_SIP_LMM 0xC200000F
+#define IMX_SIP_LMM_BOOT 0x0
+#define IMX_SIP_LMM_SHUTDOWN 0x1
+
+#define IMX95_M7_LM_ID 0x1
+
+static struct snd_soc_dai_driver imx95_dai[] = {
+	IMX_SOF_DAI_DRV_ENTRY_BIDIR("sai3", 1, 32),
+};
+
+static struct snd_sof_dsp_ops sof_imx9_ops;
+
+static int imx95_ops_init(struct snd_sof_dev *sdev)
+{
+	/* first copy from template */
+	memcpy(&sof_imx9_ops, &sof_imx_ops, sizeof(sof_imx_ops));
+
+	/* ... and finally set DAI driver */
+	sof_imx9_ops.drv = imx95_dai;
+	sof_imx9_ops.num_drv = ARRAY_SIZE(imx95_dai);
+
+	return 0;
+}
+
+static int imx95_chip_probe(struct snd_sof_dev *sdev)
+{
+	struct resource *res;
+	struct arm_smccc_res smc_res;
+	struct platform_device *pdev;
+
+	pdev = to_platform_device(sdev->dev);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
+	if (!res)
+		return dev_err_probe(sdev->dev, -ENODEV,
+				     "failed to fetch SRAM region\n");
+
+	/* set core boot reset address */
+	arm_smccc_smc(IMX_SIP_SRC, IMX_SIP_SRC_M_RESET_ADDR_SET, res->start,
+		      IMX95_CPU_VEC_FLAGS_BOOT, 0, 0, 0, 0, &smc_res);
+
+	return smc_res.a0;
+}
+
+static int imx95_core_kick(struct snd_sof_dev *sdev)
+{
+	struct arm_smccc_res smc_res;
+
+	arm_smccc_smc(IMX_SIP_LMM, IMX_SIP_LMM_BOOT,
+		      IMX95_M7_LM_ID, 0, 0, 0, 0, 0, &smc_res);
+
+	return smc_res.a0;
+}
+
+static int imx95_core_shutdown(struct snd_sof_dev *sdev)
+{
+	struct arm_smccc_res smc_res;
+
+	arm_smccc_smc(IMX_SIP_LMM, IMX_SIP_LMM_SHUTDOWN,
+		      IMX95_M7_LM_ID, 0, 0, 0, 0, 0, &smc_res);
+
+	return smc_res.a0;
+}
+
+static const struct imx_chip_ops imx95_chip_ops = {
+	.probe = imx95_chip_probe,
+	.core_kick = imx95_core_kick,
+	.core_shutdown = imx95_core_shutdown,
+};
+
+static struct imx_memory_info imx95_memory_regions[] = {
+	{ .name = "sram", .reserved = false },
+	{ }
+};
+
+static const struct imx_chip_info imx95_chip_info = {
+	.ipc_info = {
+		.boot_mbox_offset = 0x6001000,
+		.window_offset = 0x6000000,
+	},
+	.has_dma_reserved = true,
+	.memory = imx95_memory_regions,
+	.ops = &imx95_chip_ops,
+};
+
+static struct snd_sof_of_mach sof_imx9_machs[] = {
+	{
+		.compatible = "fsl,imx95-19x19-evk",
+		.sof_tplg_filename = "sof-imx95-wm8962.tplg",
+		.drv_name = "asoc-audio-graph-card2",
+	},
+	{
+	}
+};
+
+IMX_SOF_DEV_DESC(imx95, sof_imx9_machs, &imx95_chip_info, &sof_imx9_ops, imx95_ops_init);
+
+static const struct of_device_id sof_of_imx9_ids[] = {
+	{
+		.compatible = "fsl,imx95-cm7-sof",
+		.data = &IMX_SOF_DEV_DESC_NAME(imx95),
+	},
+	{
+	},
+};
+MODULE_DEVICE_TABLE(of, sof_of_imx9_ids);
+
+static struct platform_driver snd_sof_of_imx9_driver = {
+	.probe = sof_of_probe,
+	.remove = sof_of_remove,
+	.driver = {
+		.name = "sof-audio-of-imx9",
+		.pm = &sof_of_pm,
+		.of_match_table = sof_of_imx9_ids,
+	},
+};
+module_platform_driver(snd_sof_of_imx9_driver);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("SOF driver for imx9 platforms");
+MODULE_AUTHOR("Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>");