/* * 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 * * This file may be distributed under the terms of the GNU General * Public License, version 2. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mcam-core.h" MODULE_ALIAS("platform:mmp-camera"); MODULE_AUTHOR("Jonathan Corbet "); 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);