[PATCH v2 09/23] gpu: host1x: convert MIPI to use operations

[Svyatoslav Ryhel <clamor95@gmail.com>]

This commit converts the existing MIPI code to use operations, which is a
necessary step for the Tegra20/Tegra30 SoCs. Additionally, it creates a
dedicated header file, tegra-mipi-cal.h, to contain the MIPI calibration
functions, improving code organization and readability.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/gpu/drm/tegra/dsi.c             |   1 +
 drivers/gpu/host1x/mipi.c               |  40 +++------
 drivers/staging/media/tegra-video/csi.c |   1 +
 include/linux/host1x.h                  |  10 ---
 include/linux/tegra-mipi-cal.h          | 111 ++++++++++++++++++++++++
 5 files changed, 126 insertions(+), 37 deletions(-)
 create mode 100644 include/linux/tegra-mipi-cal.h

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 64f12a85a9dd..278bf2c85524 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -14,6 +14,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/reset.h>
+#include <linux/tegra-mipi-cal.h>
 
 #include <video/mipi_display.h>
 
diff --git a/drivers/gpu/host1x/mipi.c b/drivers/gpu/host1x/mipi.c
index e51b43dd15a3..2fa339a428f3 100644
--- a/drivers/gpu/host1x/mipi.c
+++ b/drivers/gpu/host1x/mipi.c
@@ -27,6 +27,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/tegra-mipi-cal.h>
 
 #include "dev.h"
 
@@ -116,23 +117,6 @@ struct tegra_mipi_soc {
 	u8 hsclkpuos;
 };
 
-struct tegra_mipi {
-	const struct tegra_mipi_soc *soc;
-	struct device *dev;
-	void __iomem *regs;
-	struct mutex lock;
-	struct clk *clk;
-
-	unsigned long usage_count;
-};
-
-struct tegra_mipi_device {
-	struct platform_device *pdev;
-	struct tegra_mipi *mipi;
-	struct device *device;
-	unsigned long pads;
-};
-
 static inline u32 tegra_mipi_readl(struct tegra_mipi *mipi,
 				   unsigned long offset)
 {
@@ -261,7 +245,7 @@ void tegra_mipi_free(struct tegra_mipi_device *device)
 }
 EXPORT_SYMBOL(tegra_mipi_free);
 
-int tegra_mipi_enable(struct tegra_mipi_device *dev)
+static int tegra114_mipi_enable(struct tegra_mipi_device *dev)
 {
 	int err = 0;
 
@@ -273,11 +257,9 @@ int tegra_mipi_enable(struct tegra_mipi_device *dev)
 	mutex_unlock(&dev->mipi->lock);
 
 	return err;
-
 }
-EXPORT_SYMBOL(tegra_mipi_enable);
 
-int tegra_mipi_disable(struct tegra_mipi_device *dev)
+static int tegra114_mipi_disable(struct tegra_mipi_device *dev)
 {
 	int err = 0;
 
@@ -289,11 +271,9 @@ int tegra_mipi_disable(struct tegra_mipi_device *dev)
 	mutex_unlock(&dev->mipi->lock);
 
 	return err;
-
 }
-EXPORT_SYMBOL(tegra_mipi_disable);
 
-int tegra_mipi_finish_calibration(struct tegra_mipi_device *device)
+static int tegra114_mipi_finish_calibration(struct tegra_mipi_device *device)
 {
 	struct tegra_mipi *mipi = device->mipi;
 	void __iomem *status_reg = mipi->regs + (MIPI_CAL_STATUS << 2);
@@ -309,9 +289,8 @@ int tegra_mipi_finish_calibration(struct tegra_mipi_device *device)
 
 	return err;
 }
-EXPORT_SYMBOL(tegra_mipi_finish_calibration);
 
-int tegra_mipi_start_calibration(struct tegra_mipi_device *device)
+static int tegra114_mipi_start_calibration(struct tegra_mipi_device *device)
 {
 	const struct tegra_mipi_soc *soc = device->mipi->soc;
 	unsigned int i;
@@ -384,7 +363,13 @@ int tegra_mipi_start_calibration(struct tegra_mipi_device *device)
 
 	return 0;
 }
-EXPORT_SYMBOL(tegra_mipi_start_calibration);
+
+static const struct tegra_mipi_ops tegra114_mipi_ops = {
+	.tegra_mipi_enable = tegra114_mipi_enable,
+	.tegra_mipi_disable = tegra114_mipi_disable,
+	.tegra_mipi_start_calibration = tegra114_mipi_start_calibration,
+	.tegra_mipi_finish_calibration = tegra114_mipi_finish_calibration,
+};
 
 static const struct tegra_mipi_pad tegra114_mipi_pads[] = {
 	{ .data = MIPI_CAL_CONFIG_CSIA },
@@ -512,6 +497,7 @@ static int tegra_mipi_probe(struct platform_device *pdev)
 
 	mipi->soc = match->data;
 	mipi->dev = &pdev->dev;
+	mipi->ops = &tegra114_mipi_ops;
 
 	mipi->regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 	if (IS_ERR(mipi->regs))
diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
index 74c92db1032f..9e3bd6109781 100644
--- a/drivers/staging/media/tegra-video/csi.c
+++ b/drivers/staging/media/tegra-video/csi.c
@@ -12,6 +12,7 @@
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/tegra-mipi-cal.h>
 
 #include <media/v4l2-fwnode.h>
 
diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index 9fa9c30a34e6..b1c6514859d3 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h
@@ -453,16 +453,6 @@ void host1x_client_unregister(struct host1x_client *client);
 int host1x_client_suspend(struct host1x_client *client);
 int host1x_client_resume(struct host1x_client *client);
 
-struct tegra_mipi_device;
-
-struct tegra_mipi_device *tegra_mipi_request(struct device *device,
-					     struct device_node *np);
-void tegra_mipi_free(struct tegra_mipi_device *device);
-int tegra_mipi_enable(struct tegra_mipi_device *device);
-int tegra_mipi_disable(struct tegra_mipi_device *device);
-int tegra_mipi_start_calibration(struct tegra_mipi_device *device);
-int tegra_mipi_finish_calibration(struct tegra_mipi_device *device);
-
 /* host1x memory contexts */
 
 struct host1x_memory_context {
diff --git a/include/linux/tegra-mipi-cal.h b/include/linux/tegra-mipi-cal.h
new file mode 100644
index 000000000000..2bfdbfd3cb77
--- /dev/null
+++ b/include/linux/tegra-mipi-cal.h
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __TEGRA_MIPI_CAL_H_
+#define __TEGRA_MIPI_CAL_H_
+
+struct tegra_mipi {
+	const struct tegra_mipi_soc *soc;
+	const struct tegra_mipi_ops *ops;
+	struct device *dev;
+	void __iomem *regs;
+	struct mutex lock;
+	struct clk *clk;
+
+	unsigned long usage_count;
+};
+
+struct tegra_mipi_device {
+	struct platform_device *pdev;
+	struct tegra_mipi *mipi;
+	struct device *device;
+	unsigned long pads;
+};
+
+/**
+ * Operations for Tegra MIPI calibration device
+ */
+struct tegra_mipi_ops {
+	/**
+	 * @tegra_mipi_enable:
+	 *
+	 * Enable MIPI calibration device
+	 */
+	int (*tegra_mipi_enable)(struct tegra_mipi_device *device);
+
+	/**
+	 * @tegra_mipi_disable:
+	 *
+	 * Disable MIPI calibration device
+	 */
+	int (*tegra_mipi_disable)(struct tegra_mipi_device *device);
+
+	/**
+	 * @tegra_mipi_start_calibration:
+	 *
+	 * Start MIPI calibration
+	 */
+	int (*tegra_mipi_start_calibration)(struct tegra_mipi_device *device);
+
+	/**
+	 * @tegra_mipi_finish_calibration:
+	 *
+	 * Finish MIPI calibration
+	 */
+	int (*tegra_mipi_finish_calibration)(struct tegra_mipi_device *device);
+};
+
+struct tegra_mipi_device *tegra_mipi_request(struct device *device,
+					     struct device_node *np);
+
+void tegra_mipi_free(struct tegra_mipi_device *device);
+
+static inline int tegra_mipi_enable(struct tegra_mipi_device *device)
+{
+	/* Tegra114+ has a dedicated MIPI calibration block */
+	if (device->mipi) {
+		if (!device->mipi->ops->tegra_mipi_enable)
+			return 0;
+
+		return device->mipi->ops->tegra_mipi_enable(device);
+	}
+
+	return -ENOSYS;
+}
+
+static inline int tegra_mipi_disable(struct tegra_mipi_device *device)
+{
+	if (device->mipi) {
+		if (!device->mipi->ops->tegra_mipi_disable)
+			return 0;
+
+		return device->mipi->ops->tegra_mipi_disable(device);
+	}
+
+	return -ENOSYS;
+}
+
+static inline int tegra_mipi_start_calibration(struct tegra_mipi_device *device)
+{
+	if (device->mipi) {
+		if (!device->mipi->ops->tegra_mipi_start_calibration)
+			return 0;
+
+		return device->mipi->ops->tegra_mipi_start_calibration(device);
+	}
+
+	return -ENOSYS;
+}
+
+static inline int tegra_mipi_finish_calibration(struct tegra_mipi_device *device)
+{
+	if (device->mipi) {
+		if (!device->mipi->ops->tegra_mipi_finish_calibration)
+			return 0;
+
+		return device->mipi->ops->tegra_mipi_finish_calibration(device);
+	}
+
+	return -ENOSYS;
+}
+
+#endif /* __TEGRA_MIPI_CAL_H_ */
-- 
2.48.1