[PATCH v2 4/5] media: venus: add no TZ boot and shutdown routine

[Vikash Garodia <vgarodia@codeaurora.org>]

Video hardware is mainly comprised of vcodec subsystem
and video control subsystem. Video control has ARM9 which
executes the video firmware instructions whereas vcodec
does the video frame processing.
This change adds support to load the video firmware and
bring ARM9 out of reset for platforms which does not
have trustzone.

Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
---
 drivers/media/platform/qcom/venus/core.c     |  6 +-
 drivers/media/platform/qcom/venus/core.h     |  5 ++
 drivers/media/platform/qcom/venus/firmware.c | 86 ++++++++++++++++++++++++++--
 drivers/media/platform/qcom/venus/firmware.h |  7 ++-
 4 files changed, 94 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 9a95f9a..101612b 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -76,7 +76,7 @@ static void venus_sys_error_handler(struct work_struct *work)
 	hfi_core_deinit(core, true);
 	hfi_destroy(core);
 	mutex_lock(&core->lock);
-	venus_shutdown(core->dev);
+	venus_shutdown(core);
 
 	pm_runtime_put_sync(core->dev);
 
@@ -318,7 +318,7 @@ static int venus_probe(struct platform_device *pdev)
 err_core_deinit:
 	hfi_core_deinit(core, false);
 err_venus_shutdown:
-	venus_shutdown(dev);
+	venus_shutdown(core);
 err_runtime_disable:
 	pm_runtime_set_suspended(dev);
 	pm_runtime_disable(dev);
@@ -339,7 +339,7 @@ static int venus_remove(struct platform_device *pdev)
 	WARN_ON(ret);
 
 	hfi_destroy(core);
-	venus_shutdown(dev);
+	venus_shutdown(core);
 	of_platform_depopulate(dev);
 
 	pm_runtime_put_sync(dev);
diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index e7bfb63..f04e25e 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -85,6 +85,10 @@ struct venus_caps {
 	bool valid;
 };
 
+struct video_firmware {
+	struct device *dev;
+	struct iommu_domain *iommu_domain;
+};
 /**
  * struct venus_core - holds core parameters valid for all instances
  *
@@ -129,6 +133,7 @@ struct venus_core {
 	struct device *dev;
 	struct device *dev_dec;
 	struct device *dev_enc;
+	struct video_firmware fw;
 	struct mutex lock;
 	struct list_head instances;
 	atomic_t insts_count;
diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
index cb7f48ef..058d544 100644
--- a/drivers/media/platform/qcom/venus/firmware.c
+++ b/drivers/media/platform/qcom/venus/firmware.c
@@ -12,8 +12,10 @@
  *
  */
 
+#include <linux/platform_device.h>
 #include <linux/device.h>
 #include <linux/firmware.h>
+#include <linux/iommu.h>
 #include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/io.h>
@@ -27,9 +29,6 @@
 #include "firmware.h"
 #include "hfi_venus_io.h"
 
-#define VENUS_PAS_ID			9
-#define VENUS_FW_MEM_SIZE		(6 * SZ_1M)
-
 static void venus_reset_hw(struct venus_core *core)
 {
 	void __iomem *reg_base = core->base;
@@ -125,7 +124,7 @@ static int venus_load_fw(struct device *dev, const char *fwname,
 	}
 	if (qcom_scm_is_available())
 		ret = qcom_mdt_load(dev, mdt, fwname, VENUS_PAS_ID, mem_va,
-				*mem_phys, *mem_size, NULL);
+				*mem_phys, *mem_size);
 	else
 		ret = qcom_mdt_load_no_init(dev, mdt, fwname, VENUS_PAS_ID,
 				mem_va, *mem_phys, *mem_size, NULL);
@@ -136,6 +135,77 @@ static int venus_load_fw(struct device *dev, const char *fwname,
 	memunmap(mem_va);
 	return ret;
 }
+
+int venus_boot_noTZ(struct venus_core *core, phys_addr_t mem_phys,
+							size_t mem_size)
+{
+	struct iommu_domain *iommu;
+	struct device *dev;
+	int ret;
+
+	if (!core->fw.dev)
+		return -EPROBE_DEFER;
+
+	dev = core->fw.dev;
+
+	iommu = iommu_domain_alloc(&platform_bus_type);
+	if (!iommu) {
+		dev_err(dev, "Failed to allocate iommu domain\n");
+		return -ENOMEM;
+	}
+
+	ret = iommu_attach_device(iommu, dev);
+	if (ret) {
+		dev_err(dev, "could not attach device\n");
+		goto err_attach;
+	}
+
+	ret = iommu_map(iommu, VENUS_FW_START_ADDR, mem_phys, mem_size,
+			IOMMU_READ|IOMMU_WRITE|IOMMU_PRIV);
+	if (ret) {
+		dev_err(dev, "could not map video firmware region\n");
+		goto err_map;
+	}
+	core->fw.iommu_domain = iommu;
+	venus_reset_hw(core);
+
+	return 0;
+
+err_map:
+	iommu_detach_device(iommu, dev);
+err_attach:
+	iommu_domain_free(iommu);
+	return ret;
+}
+
+int venus_shutdown_noTZ(struct venus_core *core)
+{
+	struct iommu_domain *iommu;
+	size_t unmapped = 0;
+	u32 reg;
+	struct device *dev = core->fw.dev;
+	void __iomem *reg_base = core->base;
+
+	/* Assert the reset to ARM9 */
+	reg = readl_relaxed(reg_base + WRAPPER_A9SS_SW_RESET);
+	reg |= BIT(4);
+	writel_relaxed(reg, reg_base + WRAPPER_A9SS_SW_RESET);
+
+	/* Make sure reset is asserted before the mapping is removed */
+	mb();
+
+	iommu = core->fw.iommu_domain;
+
+	unmapped = iommu_unmap(iommu, VENUS_FW_START_ADDR, VENUS_FW_MEM_SIZE);
+	if (unmapped != VENUS_FW_MEM_SIZE)
+		dev_err(dev, "failed to unmap firmware\n");
+
+	iommu_detach_device(iommu, dev);
+	iommu_domain_free(iommu);
+
+	return 0;
+}
+
 int venus_boot(struct venus_core *core)
 {
 	phys_addr_t mem_phys;
@@ -156,16 +226,20 @@ int venus_boot(struct venus_core *core)
 
 	if (qcom_scm_is_available())
 		ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
+	else
+		ret = venus_boot_noTZ(core, mem_phys, mem_size);
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(venus_boot);
 
-int venus_shutdown(struct device *dev)
+int venus_shutdown(struct venus_core *core)
 {
 	int ret = 0;
 
 	if (qcom_scm_is_available())
 		ret = qcom_scm_pas_shutdown(VENUS_PAS_ID);
+	else
+		ret = venus_shutdown_noTZ(core);
+
 	return ret;
 }
diff --git a/drivers/media/platform/qcom/venus/firmware.h b/drivers/media/platform/qcom/venus/firmware.h
index 0916826..67fdd89 100644
--- a/drivers/media/platform/qcom/venus/firmware.h
+++ b/drivers/media/platform/qcom/venus/firmware.h
@@ -14,10 +14,15 @@
 #ifndef __VENUS_FIRMWARE_H__
 #define __VENUS_FIRMWARE_H__
 
+#define VENUS_PAS_ID			9
+#define VENUS_FW_START_ADDR		0x0
+#define VENUS_FW_MEM_SIZE		(6 * SZ_1M)
+#define VENUS_MAX_MEM_REGION	0xE0000000
+
 struct device;
 
 int venus_boot(struct venus_core *core);
-int venus_shutdown(struct device *dev);
+int venus_shutdown(struct venus_core *core);
 int venus_set_hw_state(enum tzbsp_video_state, struct venus_core *core);
 
 #endif
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project