[media] marvell-cam: Basic working MMP camera driver

Now we have a camera working over the marvell cam controller core.  It
works like the cafe driver and has all the same limitations, contiguous DMA
only being one of them.  But it's a start.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 339 insertions, 0 deletions

diff --git a/drivers/media/video/marvell-ccic/mmp-driver.c b/drivers/media/video/marvell-ccic/mmp-driver.c
new file mode 100644
index 000000000000..ac9976f23a61
--- /dev/null
+++ b/drivers/media/video/marvell-ccic/mmp-driver.c
@@ -0,0 +1,339 @@
+/*
+ * 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);