/*
- * Debugging and related. FIXME these are broken
+ * Debugging and related.
*/
#define cam_err(cam, fmt, arg...) \
dev_err((cam)->dev, fmt, ##arg);
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)
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 */
}
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);
}
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);
}
--- /dev/null
+/*
+ * 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);
projects / deliverable / linux.git / commitdiff
