[alsa-devel] [PATCH 2/5] ASoC: Intel: Add common SST driver loader on ACPI systems

[Liam Girdwood]

From: Jarkko Nikula <jarkko.nikula at linux.intel.com>

Most of the SST devices will be exposed as ACPI devices. It makes sense to
avoid duplication of the driver enumeration logic and concentrate the functionality
into a single ACPI SST enumeration file.

Idea of this loader is to parse data we get from ACPI and to be able to load
needed other SST drivers and ASoC machine driver runtime based on single
ACPI ID what BIOS gives to us.

Signed-off-by: Jarkko Nikula <jarkko.nikula at linux.intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood at linux.intel.com>
---
 sound/soc/intel/sst-acpi.c | 212 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 212 insertions(+)
 create mode 100644 sound/soc/intel/sst-acpi.c

diff --git a/sound/soc/intel/sst-acpi.c b/sound/soc/intel/sst-acpi.c
new file mode 100644
index 0000000..72eedae
--- /dev/null
+++ b/sound/soc/intel/sst-acpi.c
@@ -0,0 +1,212 @@
+/*
+ * Intel SST loader on ACPI systems
+ *
+ * Copyright (C) 2013, Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "sst-dsp.h"
+
+#define SST_LPT_DSP_DMA_ADDR_OFFSET	0x0F0000
+#define SST_WPT_DSP_DMA_ADDR_OFFSET	0x0FE000
+#define SST_LPT_DSP_DMA_SIZE		(1024 - 1)
+
+/* Descriptor for setting up SST platform data */
+struct sst_acpi_desc {
+	const char *drv_name;
+	/* Platform resource indexes. Must set to -1 if not used */
+	int resindex_lpe_base;
+	int resindex_pcicfg_base;
+	int resindex_fw_base;
+	int irqindex_host_ipc;
+	int resindex_dma_base;
+	/* Unique number identifying the SST core on platform */
+	int sst_id;
+	/* firmware file name */
+	const char *fw_filename;
+	/* DMA only valid when resindex_dma_base != -1*/
+	int dma_engine;
+	int dma_size;
+};
+
+/* Descriptor for SST ASoC machine driver */
+struct sst_acpi_mach {
+	const char *drv_name;
+	struct sst_acpi_desc *res_desc;
+};
+
+struct sst_acpi_priv {
+	struct platform_device *pdev_mach;
+	struct platform_device *pdev_pcm;
+	struct sst_pdata sst_pdata;
+	struct sst_acpi_desc *desc;
+};
+
+static int sst_acpi_probe(struct platform_device *pdev)
+{
+	const struct acpi_device_id *id;
+	struct device *dev = &pdev->dev;
+	struct sst_acpi_priv *sst_acpi;
+	struct sst_pdata *sst_pdata;
+	struct sst_acpi_mach *mach;
+	struct sst_acpi_desc *desc;
+	struct resource *mmio;
+	int ret = 0;
+
+	sst_acpi = devm_kzalloc(dev, sizeof(*sst_acpi), GFP_KERNEL);
+	if (sst_acpi == NULL)
+		return -ENOMEM;
+
+	id = acpi_match_device(dev->driver->acpi_match_table, dev);
+	if (!id)
+		return -ENODEV;
+
+	mach = (struct sst_acpi_mach *)id->driver_data;
+	desc = mach->res_desc;
+	sst_pdata = &sst_acpi->sst_pdata;
+	sst_pdata->id = desc->sst_id;
+	sst_pdata->fw_filename = desc->fw_filename;
+	sst_acpi->desc = desc;
+
+	if (desc->resindex_dma_base >= 0) {
+		sst_pdata->dma_engine = desc->dma_engine;
+		sst_pdata->dma_base = desc->resindex_dma_base;
+		sst_pdata->dma_size = desc->dma_size;
+	}
+
+	if (desc->irqindex_host_ipc >= 0)
+		sst_pdata->irq = platform_get_irq(pdev, desc->irqindex_host_ipc);
+
+	if (desc->resindex_lpe_base >= 0) {
+		mmio = platform_get_resource(pdev, IORESOURCE_MEM,
+					     desc->resindex_lpe_base);
+		if (mmio) {
+			sst_pdata->lpe_base = mmio->start;
+			sst_pdata->lpe_size = resource_size(mmio);
+		}
+	}
+
+	if (desc->resindex_pcicfg_base >= 0) {
+		mmio = platform_get_resource(pdev, IORESOURCE_MEM,
+					     desc->resindex_pcicfg_base);
+		if (mmio) {
+			sst_pdata->pcicfg_base = mmio->start;
+			sst_pdata->pcicfg_size = resource_size(mmio);
+		}
+	}
+
+	if (desc->resindex_fw_base >= 0) {
+		mmio = platform_get_resource(pdev, IORESOURCE_MEM,
+					     desc->resindex_fw_base);
+		if (mmio) {
+			sst_pdata->fw_base = mmio->start;
+			sst_pdata->fw_size = resource_size(mmio);
+		}
+	}
+
+	/* register PCM and DAI driver */
+	sst_acpi->pdev_pcm =
+		platform_device_register_data(dev, desc->drv_name, -1,
+					      sst_pdata, sizeof(*sst_pdata));
+	if (IS_ERR(sst_acpi->pdev_pcm))
+		return PTR_ERR(sst_acpi->pdev_pcm);
+
+	/* register machine driver */
+	platform_set_drvdata(pdev, sst_acpi);
+
+	sst_acpi->pdev_mach =
+		platform_device_register_data(dev, mach->drv_name, -1,
+					      sst_pdata, sizeof(*sst_pdata));
+	if (IS_ERR(sst_acpi->pdev_mach)) {
+		ret = PTR_ERR(sst_acpi->pdev_mach);
+		goto sst_err;
+	}
+
+	return ret;
+
+sst_err:
+	platform_device_unregister(sst_acpi->pdev_pcm);
+	return ret;
+}
+
+static int sst_acpi_remove(struct platform_device *pdev)
+{
+	struct sst_acpi_priv *sst_acpi = platform_get_drvdata(pdev);
+
+	platform_device_unregister(sst_acpi->pdev_mach);
+	platform_device_unregister(sst_acpi->pdev_pcm);
+
+	return 0;
+}
+
+static struct sst_acpi_desc sst_acpi_haswell_desc = {
+	.drv_name = "haswell-pcm-audio",
+	.resindex_lpe_base = 0,
+	.resindex_pcicfg_base = 1,
+	.resindex_fw_base = -1,
+	.irqindex_host_ipc = 0,
+	.sst_id = SST_DEV_ID_LYNX_POINT,
+	.fw_filename = "IntcSST1.bin",
+	.dma_engine = SST_DMA_TYPE_DW,
+	.resindex_dma_base = SST_LPT_DSP_DMA_ADDR_OFFSET,
+	.dma_size = SST_LPT_DSP_DMA_SIZE,
+};
+
+static struct sst_acpi_desc sst_acpi_broadwell_desc = {
+	.drv_name = "haswell-pcm-audio",
+	.resindex_lpe_base = 0,
+	.resindex_pcicfg_base = 1,
+	.resindex_fw_base = -1,
+	.irqindex_host_ipc = 0,
+	.sst_id = SST_DEV_ID_WILDCAT_POINT,
+	.fw_filename = "IntcSST2.bin",
+	.dma_engine = SST_DMA_TYPE_DW,
+	.resindex_dma_base = SST_WPT_DSP_DMA_ADDR_OFFSET,
+	.dma_size = SST_LPT_DSP_DMA_SIZE,
+};
+
+static struct sst_acpi_mach haswell_mach = {
+	.drv_name = "haswell-audio",
+	.res_desc = &sst_acpi_haswell_desc,
+};
+
+static struct sst_acpi_mach broadwell_mach = {
+	.drv_name = "broadwell-audio",
+	.res_desc = &sst_acpi_broadwell_desc,
+};
+
+static struct acpi_device_id sst_acpi_match[] = {
+	{ "INT33C8", (unsigned long)&haswell_mach },
+	{ "INT3438", (unsigned long)&broadwell_mach },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, sst_acpi_match);
+
+static struct platform_driver sst_acpi_driver = {
+	.probe = sst_acpi_probe,
+	.remove = sst_acpi_remove,
+	.driver = {
+		.name = "sst-acpi",
+		.owner = THIS_MODULE,
+		.acpi_match_table = ACPI_PTR(sst_acpi_match),
+	},
+};
+module_platform_driver(sst_acpi_driver);
+
+MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula at linux.intel.com>");
+MODULE_DESCRIPTION("Intel SST loader on ACPI systems");
+MODULE_LICENSE("GPL v2");
-- 
1.8.3.2