diff options
Diffstat (limited to 'drivers/media/platform/marvell-ccic/mmp-driver.c')
| -rw-r--r-- | drivers/media/platform/marvell-ccic/mmp-driver.c | 380 |
1 files changed, 380 insertions, 0 deletions
diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c new file mode 100644 index 000000000000..c4c17fe76c0d --- /dev/null +++ b/drivers/media/platform/marvell-ccic/mmp-driver.c @@ -0,0 +1,380 @@ +/* + * 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 <linux/pm.h> + +#include "mcam-core.h" + +MODULE_ALIAS("platform:mmp-camera"); +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_ctlr(struct mmp_camera *cam) +{ + iowrite32(0x3f, cam->power_regs + REG_CCIC_DCGCR); + iowrite32(0x3805b, cam->power_regs + REG_CCIC_CRCR); + mdelay(1); +} + +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. + */ + mmpcam_power_up_ctlr(cam); +/* + * 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->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; + mcam->buffer_mode = B_DMA_sg; + 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); +out_gpio2: + mmpcam_power_down(mcam); + 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); +} + +/* + * Suspend/resume support. + */ +#ifdef CONFIG_PM + +static int mmpcam_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct mmp_camera *cam = mmpcam_find_device(pdev); + + if (state.event != PM_EVENT_SUSPEND) + return 0; + mccic_suspend(&cam->mcam); + return 0; +} + +static int mmpcam_resume(struct platform_device *pdev) +{ + struct mmp_camera *cam = mmpcam_find_device(pdev); + + /* + * Power up unconditionally just in case the core tries to + * touch a register even if nothing was active before; trust + * me, it's better this way. + */ + mmpcam_power_up_ctlr(cam); + return mccic_resume(&cam->mcam); +} + +#endif + + +static struct platform_driver mmpcam_driver = { + .probe = mmpcam_probe, + .remove = mmpcam_platform_remove, +#ifdef CONFIG_PM + .suspend = mmpcam_suspend, + .resume = mmpcam_resume, +#endif + .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); |
