[PATCH v2 3/3] remoteproc: qcom: add Venus video core firmware loader driver

[Stanimir Varbanov <stanimir.varbanov@linaro.org>]

This driver will load and authenticate the Venus firmware and
bringing it core out of reset. Those two functionalities are
via secure monitor calls to trusted environment.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
---
 drivers/remoteproc/Kconfig          |  12 ++
 drivers/remoteproc/Makefile         |   1 +
 drivers/remoteproc/qcom_venus_pil.c | 213 ++++++++++++++++++++++++++++++++++++
 3 files changed, 226 insertions(+)
 create mode 100644 drivers/remoteproc/qcom_venus_pil.c

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index f396bfef5d42..0e90a2491873 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -107,6 +107,18 @@ config QCOM_WCNSS_PIL
 	  Say y here to support the Peripheral Image Loader for the Qualcomm
 	  Wireless Connectivity Subsystem.
 
+config QCOM_VENUS_PIL
+	tristate "Qualcomm Venus Peripheral Image Loader"
+	depends on OF && ARCH_QCOM
+	depends on QCOM_SCM
+	select QCOM_MDT_LOADER
+	select REMOTEPROC
+	help
+	  Say y here to support Qualcomm Peripherial Image Loader for the
+	  Venus remote processor. The Venus remote processor is a
+	  micro-controller plus dedicated hardware for video acceleration
+	  of video decoding and encoding operations.
+
 config ST_REMOTEPROC
 	tristate "ST remoteproc support"
 	depends on ARCH_STI
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 6dfb62ed643f..852711b89844 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -15,4 +15,5 @@ obj-$(CONFIG_QCOM_MDT_LOADER)		+= qcom_mdt_loader.o
 obj-$(CONFIG_QCOM_Q6V5_PIL)		+= qcom_q6v5_pil.o
 obj-$(CONFIG_QCOM_WCNSS_IRIS)		+= qcom_wcnss_iris.o
 obj-$(CONFIG_QCOM_WCNSS_PIL)		+= qcom_wcnss.o
+obj-$(CONFIG_QCOM_VENUS_PIL)            += qcom_venus_pil.o
 obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
diff --git a/drivers/remoteproc/qcom_venus_pil.c b/drivers/remoteproc/qcom_venus_pil.c
new file mode 100644
index 000000000000..6d4e55bffef5
--- /dev/null
+++ b/drivers/remoteproc/qcom_venus_pil.c
@@ -0,0 +1,213 @@
+/*
+ * Qualcomm Venus Peripheral Image Loader
+ *
+ * Copyright (C) 2016 Linaro Ltd
+ *
+ * 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/dma-mapping.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/qcom_scm.h>
+#include <linux/remoteproc.h>
+
+#include "qcom_mdt_loader.h"
+#include "remoteproc_internal.h"
+
+#define VENUS_CRASH_REASON_SMEM		425
+#define VENUS_FIRMWARE_NAME		"venus.mdt"
+#define VENUS_PAS_ID			9
+#define VENUS_FW_MEM_SIZE		SZ_8M
+
+struct qcom_venus {
+	struct device *dev;
+	struct rproc *rproc;
+	phys_addr_t fw_addr;
+	phys_addr_t mem_phys;
+	void *mem_va;
+	size_t mem_size;
+};
+
+static int venus_load(struct rproc *rproc, const struct firmware *fw)
+{
+	struct qcom_venus *venus = rproc->priv;
+	phys_addr_t pa;
+	size_t fw_size;
+	bool relocate;
+	int ret;
+
+	ret = qcom_scm_pas_init_image(VENUS_PAS_ID, fw->data, fw->size);
+	if (ret) {
+		dev_err(&rproc->dev, "invalid firmware metadata (%d)\n", ret);
+		return -EINVAL;
+	}
+
+	ret = qcom_mdt_parse(fw, &venus->fw_addr, &fw_size, &relocate);
+	if (ret) {
+		dev_err(&rproc->dev, "failed to parse mdt header (%d)\n", ret);
+		return ret;
+	}
+
+	if (fw_size > venus->mem_size)
+		return -ENOMEM;
+
+	pa = relocate ? venus->mem_phys : venus->fw_addr;
+
+	ret = qcom_scm_pas_mem_setup(VENUS_PAS_ID, pa, fw_size);
+	if (ret) {
+		dev_err(&rproc->dev, "unable to setup memory (%d)\n", ret);
+		return -EINVAL;
+	}
+
+	return qcom_mdt_load(rproc, fw, VENUS_FIRMWARE_NAME);
+}
+
+static const struct rproc_fw_ops venus_fw_ops = {
+	.find_rsc_table = qcom_mdt_find_rsc_table,
+	.load = venus_load,
+};
+
+static int venus_start(struct rproc *rproc)
+{
+	struct qcom_venus *venus = rproc->priv;
+	int ret;
+
+	ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
+	if (ret)
+		dev_err(venus->dev,
+			"authentication image and release reset failed (%d)\n",
+			ret);
+
+	return ret;
+}
+
+static int venus_stop(struct rproc *rproc)
+{
+	struct qcom_venus *venus = rproc->priv;
+	int ret;
+
+	ret = qcom_scm_pas_shutdown(VENUS_PAS_ID);
+	if (ret)
+		dev_err(venus->dev, "failed to shutdown: %d\n", ret);
+
+	return ret;
+}
+
+static void *venus_da_to_va(struct rproc *rproc, u64 da, int len)
+{
+	struct qcom_venus *venus = rproc->priv;
+	s64 offset;
+
+	offset = da - venus->fw_addr;
+
+	if (offset < 0 || offset + len > venus->mem_size)
+		return NULL;
+
+	return venus->mem_va + offset;
+}
+
+static const struct rproc_ops venus_ops = {
+	.start = venus_start,
+	.stop = venus_stop,
+	.da_to_va = venus_da_to_va,
+};
+
+static int venus_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct qcom_venus *venus;
+	struct rproc *rproc;
+	int ret;
+
+	if (!qcom_scm_is_available())
+		return -EPROBE_DEFER;
+
+	if (!qcom_scm_pas_supported(VENUS_PAS_ID)) {
+		dev_err(dev, "PAS is not available for venus\n");
+		return -ENXIO;
+	}
+
+	ret = of_reserved_mem_device_init(dev);
+	if (ret)
+		return ret;
+
+	rproc = rproc_alloc(dev, pdev->name, &venus_ops, VENUS_FIRMWARE_NAME,
+			    sizeof(*venus));
+	if (!rproc) {
+		dev_err(dev, "unable to allocate remoteproc\n");
+		ret = -ENOMEM;
+		goto release_mem;
+	}
+
+	rproc->fw_ops = &venus_fw_ops;
+	venus = rproc->priv;
+	venus->dev = dev;
+	venus->rproc = rproc;
+	venus->mem_size = VENUS_FW_MEM_SIZE;
+
+	platform_set_drvdata(pdev, venus);
+
+	venus->mem_va = dma_alloc_coherent(dev, venus->mem_size,
+					   &venus->mem_phys, GFP_KERNEL);
+	if (!venus->mem_va) {
+		ret = -ENOMEM;
+		goto free_rproc;
+	}
+
+	ret = rproc_add(rproc);
+	if (ret)
+		goto free_mem;
+
+	return 0;
+
+free_mem:
+	dma_free_coherent(dev, venus->mem_size, venus->mem_va, venus->mem_phys);
+free_rproc:
+	rproc_put(rproc);
+release_mem:
+	of_reserved_mem_device_release(dev);
+
+	return ret;
+}
+
+static int venus_remove(struct platform_device *pdev)
+{
+	struct qcom_venus *venus = platform_get_drvdata(pdev);
+	struct device *dev = venus->dev;
+
+	rproc_del(venus->rproc);
+	rproc_put(venus->rproc);
+	dma_free_coherent(dev, venus->mem_size, venus->mem_va, venus->mem_phys);
+	of_reserved_mem_device_release(dev);
+
+	return 0;
+}
+
+static const struct of_device_id venus_of_match[] = {
+	{ .compatible = "qcom,venus-pil" },
+	{ },
+};
+
+static struct platform_driver venus_driver = {
+	.probe = venus_probe,
+	.remove = venus_remove,
+	.driver = {
+		.name = "qcom-venus-pil",
+		.of_match_table = venus_of_match,
+	},
+};
+
+module_platform_driver(venus_driver);
+MODULE_DESCRIPTION("Peripheral Image Loader for Venus");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4