media: venus: firmware: add routine to reset ARM9

Add routine to reset the ARM9 and brings it out of reset. Also
abstract the Venus CPU state handling with a new function. This
is in preparation to add PIL functionality in venus driver.
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
Acked-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Tested-by: Alexandre Courbot <acourbot@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/qcom/venus/core.h

@@ -98,6 +98,7 @@ struct venus_caps {
  * @dev:		convenience struct device pointer
  * @dev_dec:	convenience struct device pointer for decoder device
  * @dev_enc:	convenience struct device pointer for encoder device
+ * @use_tz:	a flag that suggests presence of trustzone
  * @lock:	a lock for this strucure
  * @instances:	a list_head of all instances
  * @insts_count:	num of instances
@@ -129,6 +130,7 @@ struct venus_core {
 	struct device *dev;
 	struct device *dev_dec;
 	struct device *dev_enc;
+	unsigned int use_tz;
 	struct mutex lock;
 	struct list_head instances;
 	atomic_t insts_count;

drivers/media/platform/qcom/venus/firmware.c

@@ -22,10 +22,43 @@
 #include <linux/sizes.h>
 #include <linux/soc/qcom/mdt_loader.h>
 
+#include "core.h"
 #include "firmware.h"
+#include "hfi_venus_io.h"
 
 #define VENUS_PAS_ID			9
 #define VENUS_FW_MEM_SIZE		(6 * SZ_1M)
+#define VENUS_FW_START_ADDR		0x0
+
+static void venus_reset_cpu(struct venus_core *core)
+{
+	void __iomem *base = core->base;
+
+	writel(0, base + WRAPPER_FW_START_ADDR);
+	writel(VENUS_FW_MEM_SIZE, base + WRAPPER_FW_END_ADDR);
+	writel(0, base + WRAPPER_CPA_START_ADDR);
+	writel(VENUS_FW_MEM_SIZE, base + WRAPPER_CPA_END_ADDR);
+	writel(VENUS_FW_MEM_SIZE, base + WRAPPER_NONPIX_START_ADDR);
+	writel(VENUS_FW_MEM_SIZE, base + WRAPPER_NONPIX_END_ADDR);
+	writel(0x0, base + WRAPPER_CPU_CGC_DIS);
+	writel(0x0, base + WRAPPER_CPU_CLOCK_CONFIG);
+
+	/* Bring ARM9 out of reset */
+	writel(0, base + WRAPPER_A9SS_SW_RESET);
+}
+
+int venus_set_hw_state(struct venus_core *core, bool resume)
+{
+	if (core->use_tz)
+		return qcom_scm_set_remote_state(resume, 0);
+
+	if (resume)
+		venus_reset_cpu(core);
+	else
+		writel(1, core->base + WRAPPER_A9SS_SW_RESET);
+
+	return 0;
+}
 
 int venus_boot(struct device *dev, const char *fwname)
 {

drivers/media/platform/qcom/venus/firmware.h

@@ -18,5 +18,16 @@ struct device;
 
 int venus_boot(struct device *dev, const char *fwname);
 int venus_shutdown(struct device *dev);
+int venus_set_hw_state(struct venus_core *core, bool suspend);
+
+static inline int venus_set_hw_state_suspend(struct venus_core *core)
+{
+	return venus_set_hw_state(core, false);
+}
+
+static inline int venus_set_hw_state_resume(struct venus_core *core)
+{
+	return venus_set_hw_state(core, true);
+}
 
 #endif

drivers/media/platform/qcom/venus/hfi_venus.c

@@ -19,7 +19,6 @@
 #include <linux/interrupt.h>
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
-#include <linux/qcom_scm.h>
 #include <linux/slab.h>
 
 #include "core.h"
@@ -27,6 +26,7 @@
 #include "hfi_msgs.h"
 #include "hfi_venus.h"
 #include "hfi_venus_io.h"
+#include "firmware.h"
 
 #define HFI_MASK_QHDR_TX_TYPE		0xff000000
 #define HFI_MASK_QHDR_RX_TYPE		0x00ff0000
@@ -55,11 +55,6 @@
 #define IFACEQ_VAR_LARGE_PKT_SIZE	512
 #define IFACEQ_VAR_HUGE_PKT_SIZE	(1024 * 12)
 
-enum tzbsp_video_state {
-	TZBSP_VIDEO_STATE_SUSPEND = 0,
-	TZBSP_VIDEO_STATE_RESUME
-};
-
 struct hfi_queue_table_header {
 	u32 version;
 	u32 size;
@@ -575,7 +570,7 @@ static int venus_power_off(struct venus_hfi_device *hdev)
 	if (!hdev->power_enabled)
 		return 0;
 
-	ret = qcom_scm_set_remote_state(TZBSP_VIDEO_STATE_SUSPEND, 0);
+	ret = venus_set_hw_state_suspend(hdev->core);
 	if (ret)
 		return ret;
 
@@ -595,7 +590,7 @@ static int venus_power_on(struct venus_hfi_device *hdev)
 	if (hdev->power_enabled)
 		return 0;
 
-	ret = qcom_scm_set_remote_state(TZBSP_VIDEO_STATE_RESUME, 0);
+	ret = venus_set_hw_state_resume(hdev->core);
 	if (ret)
 		goto err;
 
@@ -608,7 +603,7 @@ static int venus_power_on(struct venus_hfi_device *hdev)
 	return 0;
 
 err_suspend:
-	qcom_scm_set_remote_state(TZBSP_VIDEO_STATE_SUSPEND, 0);
+	venus_set_hw_state_suspend(hdev->core);
 err:
 	hdev->power_enabled = false;
 	return ret;

drivers/media/platform/qcom/venus/hfi_venus_io.h

@@ -112,6 +112,13 @@
 #define WRAPPER_CPU_STATUS			(WRAPPER_BASE + 0x2014)
 #define WRAPPER_CPU_STATUS_WFI			BIT(0)
 #define WRAPPER_SW_RESET			(WRAPPER_BASE + 0x3000)
+#define WRAPPER_CPA_START_ADDR			(WRAPPER_BASE + 0x1020)
+#define WRAPPER_CPA_END_ADDR			(WRAPPER_BASE + 0x1024)
+#define WRAPPER_FW_START_ADDR			(WRAPPER_BASE + 0x1028)
+#define WRAPPER_FW_END_ADDR			(WRAPPER_BASE + 0x102C)
+#define WRAPPER_NONPIX_START_ADDR		(WRAPPER_BASE + 0x1030)
+#define WRAPPER_NONPIX_END_ADDR			(WRAPPER_BASE + 0x1034)
+#define WRAPPER_A9SS_SW_RESET			(WRAPPER_BASE + 0x3000)
 
 /* Venus 4xx */
 #define WRAPPER_VCODEC0_MMCC_POWER_STATUS	(WRAPPER_BASE + 0x90)