[media] marvell-cam: Basic working MMP camera driver (67a8dbbc) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/media/video/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -128,6 +128,7 @@ obj-$(CONFIG_VIDEO_M32R_AR_M64278) += arv.o
		obj-$(CONFIG_VIDEO_CX2341X) += cx2341x.o

		obj-$(CONFIG_VIDEO_CAFE_CCIC) += marvell-ccic/
		obj-$(CONFIG_VIDEO_MMP_CAMERA) += marvell-ccic/

		obj-$(CONFIG_VIDEO_VIA_CAMERA) += via-camera.o

drivers/media/video/marvell-ccic/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -7,3 +7,14 @@ config VIDEO_CAFE_CCIC
		CMOS camera controller. This is the controller found on first-
		generation OLPC systems.

		config VIDEO_MMP_CAMERA
		tristate "Marvell Armada 610 integrated camera controller support"
		depends on ARCH_MMP && I2C && VIDEO_V4L2
		select VIDEO_OV7670
		select I2C_GPIO
		---help---
		This is a Video4Linux2 driver for the integrated camera
		controller found on Marvell Armada 610 application
		processors (and likely beyond). This is the controller found
		in OLPC XO 1.75 systems.

drivers/media/video/marvell-ccic/Makefile

+4 −0

Original line number	Diff line number	Diff line
		obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o
		cafe_ccic-y := cafe-driver.o mcam-core.o

		obj-$(CONFIG_VIDEO_MMP_CAMERA) += mmp_camera.o
		mmp_camera-y := mmp-driver.o mcam-core.o

drivers/media/video/marvell-ccic/mcam-core.c

+20 −8

Original line number	Diff line number	Diff line
		@@ -167,7 +167,7 @@ static void mcam_set_config_needed(struct mcam_camera *cam, int needed)


		/*
		* Debugging and related. FIXME these are broken
		* Debugging and related.
		*/
		#define cam_err(cam, fmt, arg...) \
		dev_err((cam)->dev, fmt, ##arg);
		@@ -202,7 +202,8 @@ static void mcam_ctlr_dma(struct mcam_camera *cam)
		mcam_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS);
		} else
		mcam_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS);
		mcam_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */
		if (cam->chip_id == V4L2_IDENT_CAFE)
		mcam_reg_write(cam, REG_UBAR, 0); /* 32 bits only */
		}

		static void mcam_ctlr_image(struct mcam_camera *cam)
		@@ -358,8 +359,8 @@ static void mcam_ctlr_power_up(struct mcam_camera *cam)
		unsigned long flags;

		spin_lock_irqsave(&cam->dev_lock, flags);
		mcam_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
		cam->plat_power_up(cam);
		mcam_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
		spin_unlock_irqrestore(&cam->dev_lock, flags);
		msleep(5); /* Just to be sure */
		}
		@@ -369,8 +370,13 @@ static void mcam_ctlr_power_down(struct mcam_camera *cam)
		unsigned long flags;

		spin_lock_irqsave(&cam->dev_lock, flags);
		cam->plat_power_down(cam);
		/*
		* School of hard knocks department: be sure we do any register
		* twiddling on the controller before calling the platform
		* power down routine.
		*/
		mcam_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN);
		cam->plat_power_down(cam);
		spin_unlock_irqrestore(&cam->dev_lock, flags);
		}

		@@ -1622,14 +1628,20 @@ int mccic_register(struct mcam_camera *cam)

		void mccic_shutdown(struct mcam_camera *cam)
		{
		if (cam->users > 0)
		/*
		* If we have no users (and we really, really should have no
		* users) the device will already be powered down. Trying to
		* take it down again will wedge the machine, which is frowned
		* upon.
		*/
		if (cam->users > 0) {
		cam_warn(cam, "Removing a device with users!\n");
		mcam_ctlr_power_down(cam);
		}
		mcam_free_dma_bufs(cam);
		if (cam->n_sbufs > 0)
		/* What if they are still mapped? Shouldn't be, but... */
		mcam_free_sio_buffers(cam);
		mcam_ctlr_stop_dma(cam);
		mcam_ctlr_power_down(cam);
		mcam_free_dma_bufs(cam);
		video_unregister_device(&cam->vdev);
		v4l2_device_unregister(&cam->v4l2_dev);
		}

drivers/media/video/marvell-ccic/mmp-driver.c

0 → 100644

+339 −0

Original line number	Diff line number	Diff line
		/*
		* Support for the camera device found on Marvell MMP processors; known
		* to work with the Armada 610 as used in the OLPC 1.75 system.
		*
		* Copyright 2011 Jonathan Corbet <corbet@lwn.net>
		*
		* This file may be distributed under the terms of the GNU General
		* Public License, version 2.
		*/

		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/i2c.h>
		#include <linux/i2c-gpio.h>
		#include <linux/interrupt.h>
		#include <linux/spinlock.h>
		#include <linux/slab.h>
		#include <linux/videodev2.h>
		#include <media/v4l2-device.h>
		#include <media/v4l2-chip-ident.h>
		#include <media/mmp-camera.h>
		#include <linux/device.h>
		#include <linux/platform_device.h>
		#include <linux/gpio.h>
		#include <linux/io.h>
		#include <linux/delay.h>
		#include <linux/list.h>

		#include "mcam-core.h"

		MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
		MODULE_LICENSE("GPL");

		struct mmp_camera {
		void *power_regs;
		struct platform_device *pdev;
		struct mcam_camera mcam;
		struct list_head devlist;
		int irq;
		};

		static inline struct mmp_camera mcam_to_cam(struct mcam_camera mcam)
		{
		return container_of(mcam, struct mmp_camera, mcam);
		}

		/*
		* A silly little infrastructure so we can keep track of our devices.
		* Chances are that we will never have more than one of them, but
		* the Armada 610 does have two controllers...
		*/

		static LIST_HEAD(mmpcam_devices);
		static struct mutex mmpcam_devices_lock;

		static void mmpcam_add_device(struct mmp_camera *cam)
		{
		mutex_lock(&mmpcam_devices_lock);
		list_add(&cam->devlist, &mmpcam_devices);
		mutex_unlock(&mmpcam_devices_lock);
		}

		static void mmpcam_remove_device(struct mmp_camera *cam)
		{
		mutex_lock(&mmpcam_devices_lock);
		list_del(&cam->devlist);
		mutex_unlock(&mmpcam_devices_lock);
		}

		/*
		* Platform dev remove passes us a platform_device, and there's
		* no handy unused drvdata to stash a backpointer in. So just
		* dig it out of our list.
		*/
		static struct mmp_camera mmpcam_find_device(struct platform_device pdev)
		{
		struct mmp_camera *cam;

		mutex_lock(&mmpcam_devices_lock);
		list_for_each_entry(cam, &mmpcam_devices, devlist) {
		if (cam->pdev == pdev) {
		mutex_unlock(&mmpcam_devices_lock);
		return cam;
		}
		}
		mutex_unlock(&mmpcam_devices_lock);
		return NULL;
		}




		/*
		* Power-related registers; this almost certainly belongs
		* somewhere else.
		*
		* ARMADA 610 register manual, sec 7.2.1, p1842.
		*/
		#define CPU_SUBSYS_PMU_BASE 0xd4282800
		#define REG_CCIC_DCGCR 0x28 /* CCIC dyn clock gate ctrl reg */
		#define REG_CCIC_CRCR 0x50 /* CCIC clk reset ctrl reg */

		/*
		* Power control.
		*/
		static void mmpcam_power_up(struct mcam_camera *mcam)
		{
		struct mmp_camera *cam = mcam_to_cam(mcam);
		struct mmp_camera_platform_data *pdata;
		/*
		* Turn on power and clocks to the controller.
		*/
		iowrite32(0x3f, cam->power_regs + REG_CCIC_DCGCR);
		iowrite32(0x3805b, cam->power_regs + REG_CCIC_CRCR);
		mdelay(1);
		/*
		* Provide power to the sensor.
		*/
		mcam_reg_write(mcam, REG_CLKCTRL, 0x60000002);
		pdata = cam->pdev->dev.platform_data;
		gpio_set_value(pdata->sensor_power_gpio, 1);
		mdelay(5);
		mcam_reg_clear_bit(mcam, REG_CTRL1, 0x10000000);
		gpio_set_value(pdata->sensor_reset_gpio, 0); /* reset is active low */
		mdelay(5);
		gpio_set_value(pdata->sensor_reset_gpio, 1); /* reset is active low */
		mdelay(5);
		}

		static void mmpcam_power_down(struct mcam_camera *mcam)
		{
		struct mmp_camera *cam = mcam_to_cam(mcam);
		struct mmp_camera_platform_data *pdata;
		/*
		* Turn off clocks and set reset lines
		*/
		iowrite32(0, cam->power_regs + REG_CCIC_DCGCR);
		iowrite32(0, cam->power_regs + REG_CCIC_CRCR);
		/*
		* Shut down the sensor.
		*/
		pdata = cam->pdev->dev.platform_data;
		gpio_set_value(pdata->sensor_power_gpio, 0);
		gpio_set_value(pdata->sensor_reset_gpio, 0);
		}


		static irqreturn_t mmpcam_irq(int irq, void *data)
		{
		struct mcam_camera *mcam = data;
		unsigned int irqs, handled;

		spin_lock(&mcam->dev_lock);
		irqs = mcam_reg_read(mcam, REG_IRQSTAT);
		handled = mccic_irq(mcam, irqs);
		spin_unlock(&mcam->dev_lock);
		return IRQ_RETVAL(handled);
		}


		static int mmpcam_probe(struct platform_device *pdev)
		{
		struct mmp_camera *cam;
		struct mcam_camera *mcam;
		struct resource *res;
		struct mmp_camera_platform_data *pdata;
		int ret;

		cam = kzalloc(sizeof(*cam), GFP_KERNEL);
		if (cam == NULL)
		return -ENOMEM;
		cam->pdev = pdev;
		INIT_LIST_HEAD(&cam->devlist);

		mcam = &cam->mcam;
		mcam->platform = MHP_Armada610;
		mcam->plat_power_up = mmpcam_power_up;
		mcam->plat_power_down = mmpcam_power_down;
		mcam->dev = &pdev->dev;
		mcam->use_smbus = 0;
		mcam->chip_id = V4L2_IDENT_ARMADA610;
		spin_lock_init(&mcam->dev_lock);
		/*
		* Get our I/O memory.
		*/
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (res == NULL) {
		dev_err(&pdev->dev, "no iomem resource!\n");
		ret = -ENODEV;
		goto out_free;
		}
		mcam->regs = ioremap(res->start, resource_size(res));
		if (mcam->regs == NULL) {
		dev_err(&pdev->dev, "MMIO ioremap fail\n");
		ret = -ENODEV;
		goto out_free;
		}
		/*
		* Power/clock memory is elsewhere; get it too. Perhaps this
		* should really be managed outside of this driver?
		*/
		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
		if (res == NULL) {
		dev_err(&pdev->dev, "no power resource!\n");
		ret = -ENODEV;
		goto out_unmap1;
		}
		cam->power_regs = ioremap(res->start, resource_size(res));
		if (cam->power_regs == NULL) {
		dev_err(&pdev->dev, "power MMIO ioremap fail\n");
		ret = -ENODEV;
		goto out_unmap1;
		}
		/*
		* Find the i2c adapter. This assumes, of course, that the
		* i2c bus is already up and functioning.
		*/
		pdata = pdev->dev.platform_data;
		mcam->i2c_adapter = platform_get_drvdata(pdata->i2c_device);
		if (mcam->i2c_adapter == NULL) {
		ret = -ENODEV;
		dev_err(&pdev->dev, "No i2c adapter\n");
		goto out_unmap2;
		}
		/*
		* Sensor GPIO pins.
		*/
		ret = gpio_request(pdata->sensor_power_gpio, "cam-power");
		if (ret) {
		dev_err(&pdev->dev, "Can't get sensor power gpio %d",
		pdata->sensor_power_gpio);
		goto out_unmap2;
		}
		gpio_direction_output(pdata->sensor_power_gpio, 0);
		ret = gpio_request(pdata->sensor_reset_gpio, "cam-reset");
		if (ret) {
		dev_err(&pdev->dev, "Can't get sensor reset gpio %d",
		pdata->sensor_reset_gpio);
		goto out_gpio;
		}
		gpio_direction_output(pdata->sensor_reset_gpio, 0);
		/*
		* Power the device up and hand it off to the core.
		*/
		mmpcam_power_up(mcam);
		ret = mccic_register(mcam);
		if (ret)
		goto out_gpio2;
		/*
		* Finally, set up our IRQ now that the core is ready to
		* deal with it.
		*/
		res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
		if (res == NULL) {
		ret = -ENODEV;
		goto out_unregister;
		}
		cam->irq = res->start;
		ret = request_irq(cam->irq, mmpcam_irq, IRQF_SHARED,
		"mmp-camera", mcam);
		if (ret == 0) {
		mmpcam_add_device(cam);
		return 0;
		}

		out_unregister:
		mccic_shutdown(mcam);
		mmpcam_power_down(mcam);
		out_gpio2:
		gpio_free(pdata->sensor_reset_gpio);
		out_gpio:
		gpio_free(pdata->sensor_power_gpio);
		out_unmap2:
		iounmap(cam->power_regs);
		out_unmap1:
		iounmap(mcam->regs);
		out_free:
		kfree(cam);
		return ret;
		}


		static int mmpcam_remove(struct mmp_camera *cam)
		{
		struct mcam_camera *mcam = &cam->mcam;
		struct mmp_camera_platform_data *pdata;

		mmpcam_remove_device(cam);
		free_irq(cam->irq, mcam);
		mccic_shutdown(mcam);
		mmpcam_power_down(mcam);
		pdata = cam->pdev->dev.platform_data;
		gpio_free(pdata->sensor_reset_gpio);
		gpio_free(pdata->sensor_power_gpio);
		iounmap(cam->power_regs);
		iounmap(mcam->regs);
		kfree(cam);
		return 0;
		}

		static int mmpcam_platform_remove(struct platform_device *pdev)
		{
		struct mmp_camera *cam = mmpcam_find_device(pdev);

		if (cam == NULL)
		return -ENODEV;
		return mmpcam_remove(cam);
		}


		static struct platform_driver mmpcam_driver = {
		.probe = mmpcam_probe,
		.remove = mmpcam_platform_remove,
		.driver = {
		.name = "mmp-camera",
		.owner = THIS_MODULE
		}
		};


		static int __init mmpcam_init_module(void)
		{
		mutex_init(&mmpcam_devices_lock);
		return platform_driver_register(&mmpcam_driver);
		}

		static void __exit mmpcam_exit_module(void)
		{
		platform_driver_unregister(&mmpcam_driver);
		/*
		* platform_driver_unregister() should have emptied the list
		*/
		if (!list_empty(&mmpcam_devices))
		printk(KERN_ERR "mmp_camera leaving devices behind\n");
		}

		module_init(mmpcam_init_module);
		module_exit(mmpcam_exit_module);