Date:   Mon,  7 Nov 2016 19:30:53 +0200
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Andy Gross <andy.gross@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        devicetree@...r.kernel.org,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH v2 3/3] remoteproc: qcom: add Venus video core firmware loader driver

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@...aro.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

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