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332 lines
7.6 KiB
332 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Microchip Image Sensor Controller (ISC) driver |
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* |
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* Copyright (C) 2016-2019 Microchip Technology, Inc. |
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* |
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* Author: Songjun Wu |
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* Author: Eugen Hristev <[email protected]> |
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* |
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* |
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* Sensor-->PFE-->WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB-->RLP-->DMA |
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* |
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* ISC video pipeline integrates the following submodules: |
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* PFE: Parallel Front End to sample the camera sensor input stream |
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* WB: Programmable white balance in the Bayer domain |
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* CFA: Color filter array interpolation module |
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* CC: Programmable color correction |
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* GAM: Gamma correction |
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* CSC: Programmable color space conversion |
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* CBC: Contrast and Brightness control |
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* SUB: This module performs YCbCr444 to YCbCr420 chrominance subsampling |
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* RLP: This module performs rounding, range limiting |
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* and packing of the incoming data |
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*/ |
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#include <linux/clk.h> |
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#include <linux/clkdev.h> |
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#include <linux/clk-provider.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include <linux/math64.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_graph.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/regmap.h> |
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#include <linux/videodev2.h> |
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#include <media/v4l2-ctrls.h> |
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#include <media/v4l2-device.h> |
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#include <media/v4l2-event.h> |
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#include <media/v4l2-image-sizes.h> |
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#include <media/v4l2-ioctl.h> |
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#include <media/v4l2-fwnode.h> |
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#include <media/v4l2-subdev.h> |
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#include <media/videobuf2-dma-contig.h> |
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#include "atmel-isc-regs.h" |
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#include "atmel-isc.h" |
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#define ISC_MAX_SUPPORT_WIDTH 2592 |
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#define ISC_MAX_SUPPORT_HEIGHT 1944 |
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#define ISC_CLK_MAX_DIV 255 |
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static int isc_parse_dt(struct device *dev, struct isc_device *isc) |
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{ |
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struct device_node *np = dev->of_node; |
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struct device_node *epn = NULL; |
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struct isc_subdev_entity *subdev_entity; |
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unsigned int flags; |
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int ret; |
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INIT_LIST_HEAD(&isc->subdev_entities); |
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while (1) { |
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struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 }; |
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epn = of_graph_get_next_endpoint(np, epn); |
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if (!epn) |
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return 0; |
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ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn), |
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&v4l2_epn); |
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if (ret) { |
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ret = -EINVAL; |
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dev_err(dev, "Could not parse the endpoint\n"); |
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break; |
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} |
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subdev_entity = devm_kzalloc(dev, sizeof(*subdev_entity), |
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GFP_KERNEL); |
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if (!subdev_entity) { |
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ret = -ENOMEM; |
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break; |
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} |
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subdev_entity->epn = epn; |
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flags = v4l2_epn.bus.parallel.flags; |
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if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW) |
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subdev_entity->pfe_cfg0 = ISC_PFE_CFG0_HPOL_LOW; |
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if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW) |
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subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_VPOL_LOW; |
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if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING) |
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subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_PPOL_LOW; |
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if (v4l2_epn.bus_type == V4L2_MBUS_BT656) |
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subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_CCIR_CRC | |
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ISC_PFE_CFG0_CCIR656; |
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list_add_tail(&subdev_entity->list, &isc->subdev_entities); |
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} |
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of_node_put(epn); |
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return ret; |
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} |
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static int atmel_isc_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct isc_device *isc; |
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struct resource *res; |
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void __iomem *io_base; |
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struct isc_subdev_entity *subdev_entity; |
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int irq; |
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int ret; |
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isc = devm_kzalloc(dev, sizeof(*isc), GFP_KERNEL); |
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if (!isc) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, isc); |
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isc->dev = dev; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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io_base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(io_base)) |
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return PTR_ERR(io_base); |
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isc->regmap = devm_regmap_init_mmio(dev, io_base, &isc_regmap_config); |
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if (IS_ERR(isc->regmap)) { |
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ret = PTR_ERR(isc->regmap); |
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dev_err(dev, "failed to init register map: %d\n", ret); |
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return ret; |
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} |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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ret = devm_request_irq(dev, irq, isc_interrupt, 0, |
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ATMEL_ISC_NAME, isc); |
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if (ret < 0) { |
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dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n", |
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irq, ret); |
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return ret; |
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} |
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ret = isc_pipeline_init(isc); |
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if (ret) |
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return ret; |
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isc->hclock = devm_clk_get(dev, "hclock"); |
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if (IS_ERR(isc->hclock)) { |
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ret = PTR_ERR(isc->hclock); |
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dev_err(dev, "failed to get hclock: %d\n", ret); |
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return ret; |
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} |
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ret = clk_prepare_enable(isc->hclock); |
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if (ret) { |
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dev_err(dev, "failed to enable hclock: %d\n", ret); |
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return ret; |
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} |
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ret = isc_clk_init(isc); |
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if (ret) { |
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dev_err(dev, "failed to init isc clock: %d\n", ret); |
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goto unprepare_hclk; |
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} |
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isc->ispck = isc->isc_clks[ISC_ISPCK].clk; |
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ret = clk_prepare_enable(isc->ispck); |
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if (ret) { |
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dev_err(dev, "failed to enable ispck: %d\n", ret); |
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goto unprepare_hclk; |
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} |
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/* ispck should be greater or equal to hclock */ |
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ret = clk_set_rate(isc->ispck, clk_get_rate(isc->hclock)); |
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if (ret) { |
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dev_err(dev, "failed to set ispck rate: %d\n", ret); |
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goto unprepare_clk; |
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} |
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ret = v4l2_device_register(dev, &isc->v4l2_dev); |
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if (ret) { |
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dev_err(dev, "unable to register v4l2 device.\n"); |
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goto unprepare_clk; |
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} |
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ret = isc_parse_dt(dev, isc); |
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if (ret) { |
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dev_err(dev, "fail to parse device tree\n"); |
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goto unregister_v4l2_device; |
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} |
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if (list_empty(&isc->subdev_entities)) { |
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dev_err(dev, "no subdev found\n"); |
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ret = -ENODEV; |
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goto unregister_v4l2_device; |
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} |
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list_for_each_entry(subdev_entity, &isc->subdev_entities, list) { |
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struct v4l2_async_subdev *asd; |
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v4l2_async_notifier_init(&subdev_entity->notifier); |
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asd = v4l2_async_notifier_add_fwnode_remote_subdev( |
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&subdev_entity->notifier, |
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of_fwnode_handle(subdev_entity->epn), |
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struct v4l2_async_subdev); |
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of_node_put(subdev_entity->epn); |
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subdev_entity->epn = NULL; |
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if (IS_ERR(asd)) { |
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ret = PTR_ERR(asd); |
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goto cleanup_subdev; |
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} |
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subdev_entity->notifier.ops = &isc_async_ops; |
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ret = v4l2_async_notifier_register(&isc->v4l2_dev, |
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&subdev_entity->notifier); |
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if (ret) { |
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dev_err(dev, "fail to register async notifier\n"); |
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goto cleanup_subdev; |
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} |
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if (video_is_registered(&isc->video_dev)) |
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break; |
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} |
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pm_runtime_set_active(dev); |
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pm_runtime_enable(dev); |
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pm_request_idle(dev); |
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return 0; |
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cleanup_subdev: |
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isc_subdev_cleanup(isc); |
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unregister_v4l2_device: |
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v4l2_device_unregister(&isc->v4l2_dev); |
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unprepare_clk: |
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clk_disable_unprepare(isc->ispck); |
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unprepare_hclk: |
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clk_disable_unprepare(isc->hclock); |
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isc_clk_cleanup(isc); |
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return ret; |
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} |
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static int atmel_isc_remove(struct platform_device *pdev) |
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{ |
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struct isc_device *isc = platform_get_drvdata(pdev); |
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pm_runtime_disable(&pdev->dev); |
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isc_subdev_cleanup(isc); |
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v4l2_device_unregister(&isc->v4l2_dev); |
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clk_disable_unprepare(isc->ispck); |
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clk_disable_unprepare(isc->hclock); |
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isc_clk_cleanup(isc); |
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return 0; |
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} |
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static int __maybe_unused isc_runtime_suspend(struct device *dev) |
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{ |
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struct isc_device *isc = dev_get_drvdata(dev); |
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clk_disable_unprepare(isc->ispck); |
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clk_disable_unprepare(isc->hclock); |
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return 0; |
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} |
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static int __maybe_unused isc_runtime_resume(struct device *dev) |
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{ |
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struct isc_device *isc = dev_get_drvdata(dev); |
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int ret; |
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ret = clk_prepare_enable(isc->hclock); |
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if (ret) |
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return ret; |
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ret = clk_prepare_enable(isc->ispck); |
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if (ret) |
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clk_disable_unprepare(isc->hclock); |
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return ret; |
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} |
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static const struct dev_pm_ops atmel_isc_dev_pm_ops = { |
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SET_RUNTIME_PM_OPS(isc_runtime_suspend, isc_runtime_resume, NULL) |
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}; |
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#if IS_ENABLED(CONFIG_OF) |
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static const struct of_device_id atmel_isc_of_match[] = { |
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{ .compatible = "atmel,sama5d2-isc" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, atmel_isc_of_match); |
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#endif |
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static struct platform_driver atmel_isc_driver = { |
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.probe = atmel_isc_probe, |
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.remove = atmel_isc_remove, |
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.driver = { |
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.name = ATMEL_ISC_NAME, |
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.pm = &atmel_isc_dev_pm_ops, |
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.of_match_table = of_match_ptr(atmel_isc_of_match), |
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}, |
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}; |
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module_platform_driver(atmel_isc_driver); |
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MODULE_AUTHOR("Songjun Wu"); |
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MODULE_DESCRIPTION("The V4L2 driver for Atmel-ISC"); |
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MODULE_LICENSE("GPL v2");
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