// SPDX-License-Identifier: GPL-2.0-only /* * 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 * Copyright 2018 Lubomir Rintel */ #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"); static char *mcam_clks[] = {"axi", "func", "phy"}; struct mmp_camera { struct platform_device *pdev; struct mcam_camera mcam; struct list_head devlist; struct clk *mipi_clk; 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; } /* * calc the dphy register values * There are three dphy registers being used. * dphy[0] - CSI2_DPHY3 * dphy[1] - CSI2_DPHY5 * dphy[2] - CSI2_DPHY6 * CSI2_DPHY3 and CSI2_DPHY6 can be set with a default value * or be calculated dynamically */ static void mmpcam_calc_dphy(struct mcam_camera *mcam) { struct mmp_camera *cam = mcam_to_cam(mcam); struct mmp_camera_platform_data *pdata = cam->pdev->dev.platform_data; struct device *dev = &cam->pdev->dev; unsigned long tx_clk_esc; /* * If CSI2_DPHY3 is calculated dynamically, * pdata->lane_clk should be already set * either in the board driver statically * or in the sensor driver dynamically. */ /* * dphy[0] - CSI2_DPHY3: * bit 0 ~ bit 7: HS Term Enable. * defines the time that the DPHY * wait before enabling the data * lane termination after detecting * that the sensor has driven the data * lanes to the LP00 bridge state. * The value is calculated by: * (Max T(D_TERM_EN)/Period(DDR)) - 1 * bit 8 ~ bit 15: HS_SETTLE * Time interval during which the HS * receiver shall ignore any Data Lane * HS transitions. * The value has been calibrated on * different boards. It seems to work well. * * More detail please refer * MIPI Alliance Spectification for D-PHY * document for explanation of HS-SETTLE * and D-TERM-EN. */ switch (pdata->dphy3_algo) { case DPHY3_ALGO_PXA910: /* * Calculate CSI2_DPHY3 algo for PXA910 */ pdata->dphy[0] = (((1 + (pdata->lane_clk * 80) / 1000) & 0xff) << 8) | (1 + pdata->lane_clk * 35 / 1000); break; case DPHY3_ALGO_PXA2128: /* * Calculate CSI2_DPHY3 algo for PXA2128 */ pdata->dphy[0] = (((2 + (pdata->lane_clk * 110) / 1000) & 0xff) << 8) | (1 + pdata->lane_clk * 35 / 1000); break; default: /* * Use default CSI2_DPHY3 value for PXA688/PXA988 */ dev_dbg(dev, "camera: use the default CSI2_DPHY3 value\n"); } /* * mipi_clk will never be changed, it is a fixed value on MMP */ if (IS_ERR(cam->mipi_clk)) return; /* get the escape clk, this is hard coded */ clk_prepare_enable(cam->mipi_clk); tx_clk_esc = (clk_get_rate(cam->mipi_clk) / 1000000) / 12; clk_disable_unprepare(cam->mipi_clk); /* * dphy[2] - CSI2_DPHY6: * bit 0 ~ bit 7: CK Term Enable * Time for the Clock Lane receiver to enable the HS line * termination. The value is calculated similarly with * HS Term Enable * bit 8 ~ bit 15: CK Settle * Time interval during which the HS receiver shall ignore * any Clock Lane HS transitions. * The value is calibrated on the boards. */ pdata->dphy[2] = ((((534 * tx_clk_esc) / 2000 - 1) & 0xff) << 8) | (((38 * tx_clk_esc) / 1000 - 1) & 0xff); dev_dbg(dev, "camera: DPHY sets: dphy3=0x%x, dphy5=0x%x, dphy6=0x%x\n", pdata->dphy[0], pdata->dphy[1], pdata->dphy[2]); } 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 void mcam_init_clk(struct mcam_camera *mcam) { unsigned int i; for (i = 0; i < NR_MCAM_CLK; i++) { if (mcam_clks[i] != NULL) { /* Some clks are not necessary on some boards * We still try to run even it fails getting clk */ mcam->clk[i] = devm_clk_get(mcam->dev, mcam_clks[i]); if (IS_ERR(mcam->clk[i])) dev_warn(mcam->dev, "Could not get clk: %s\n", mcam_clks[i]); } } } static int mmpcam_probe(struct platform_device *pdev) { struct mmp_camera *cam; struct mcam_camera *mcam; struct resource *res; struct fwnode_handle *ep; struct mmp_camera_platform_data *pdata; int ret; cam = devm_kzalloc(&pdev->dev, sizeof(*cam), GFP_KERNEL); if (cam == NULL) return -ENOMEM; cam->pdev = pdev; INIT_LIST_HEAD(&cam->devlist); mcam = &cam->mcam; mcam->calc_dphy = mmpcam_calc_dphy; mcam->dev = &pdev->dev; pdata = pdev->dev.platform_data; if (pdata) { mcam->mclk_src = pdata->mclk_src; mcam->mclk_div = pdata->mclk_div; mcam->bus_type = pdata->bus_type; mcam->dphy = pdata->dphy; mcam->lane = pdata->lane; } else { /* * These are values that used to be hardcoded in mcam-core and * work well on a OLPC XO 1.75 with a parallel bus sensor. * If it turns out other setups make sense, the values should * be obtained from the device tree. */ mcam->mclk_src = 3; mcam->mclk_div = 2; } if (mcam->bus_type == V4L2_MBUS_CSI2_DPHY) { cam->mipi_clk = devm_clk_get(mcam->dev, "mipi"); if ((IS_ERR(cam->mipi_clk) && mcam->dphy[2] == 0)) return PTR_ERR(cam->mipi_clk); } mcam->mipi_enabled = false; mcam->chip_id = MCAM_ARMADA610; mcam->buffer_mode = B_DMA_sg; strscpy(mcam->bus_info, "platform:mmp-camera", sizeof(mcam->bus_info)); spin_lock_init(&mcam->dev_lock); /* * Get our I/O memory. */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); mcam->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(mcam->regs)) return PTR_ERR(mcam->regs); mcam->regs_size = resource_size(res); mcam_init_clk(mcam); /* * Create a match of the sensor against its OF node. */ ep = fwnode_graph_get_next_endpoint(of_fwnode_handle(pdev->dev.of_node), NULL); if (!ep) return -ENODEV; mcam->asd.match_type = V4L2_ASYNC_MATCH_FWNODE; mcam->asd.match.fwnode = fwnode_graph_get_remote_port_parent(ep); fwnode_handle_put(ep); /* * Register the device with the core. */ ret = mccic_register(mcam); if (ret) return ret; /* * Add OF clock provider. */ ret = of_clk_add_provider(pdev->dev.of_node, of_clk_src_simple_get, mcam->mclk); if (ret) { dev_err(&pdev->dev, "can't add DT clock provider\n"); goto out; } /* * 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; } cam->irq = res->start; ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED, "mmp-camera", mcam); if (ret == 0) { mmpcam_add_device(cam); return 0; } out: fwnode_handle_put(mcam->asd.match.fwnode); mccic_shutdown(mcam); return ret; } static int mmpcam_remove(struct mmp_camera *cam) { struct mcam_camera *mcam = &cam->mcam; mmpcam_remove_device(cam); mccic_shutdown(mcam); 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); return mccic_resume(&cam->mcam); } #endif static const struct of_device_id mmpcam_of_match[] = { { .compatible = "marvell,mmp2-ccic", }, {}, }; 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", .of_match_table = of_match_ptr(mmpcam_of_match), } }; 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);