diff options
Diffstat (limited to 'drivers/staging/media/starfive/camss/stf-camss.c')
-rw-r--r-- | drivers/staging/media/starfive/camss/stf-camss.c | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/drivers/staging/media/starfive/camss/stf-camss.c b/drivers/staging/media/starfive/camss/stf-camss.c new file mode 100644 index 000000000000..c9743ff23b81 --- /dev/null +++ b/drivers/staging/media/starfive/camss/stf-camss.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * stf_camss.c + * + * Starfive Camera Subsystem driver + * + * Copyright (C) 2021-2023 StarFive Technology Co., Ltd. + * + * Author: Jack Zhu <jack.zhu@starfivetech.com> + * Author: Changhuang Liang <changhuang.liang@starfivetech.com> + * + */ +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_graph.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/videodev2.h> +#include <media/v4l2-fwnode.h> +#include <media/v4l2-mc.h> + +#include "stf-camss.h" + +static const char * const stfcamss_clocks[] = { + "wrapper_clk_c", + "ispcore_2x", + "isp_axi", +}; + +static const char * const stfcamss_resets[] = { + "wrapper_p", + "wrapper_c", + "axiwr", + "isp_top_n", + "isp_top_axi", +}; + +static int stfcamss_get_mem_res(struct stfcamss *stfcamss) +{ + struct platform_device *pdev = to_platform_device(stfcamss->dev); + + stfcamss->syscon_base = + devm_platform_ioremap_resource_byname(pdev, "syscon"); + if (IS_ERR(stfcamss->syscon_base)) + return PTR_ERR(stfcamss->syscon_base); + + stfcamss->isp_base = devm_platform_ioremap_resource_byname(pdev, "isp"); + if (IS_ERR(stfcamss->isp_base)) + return PTR_ERR(stfcamss->isp_base); + + return 0; +} + +/* + * stfcamss_of_parse_endpoint_node - Parse port endpoint node + * @dev: Device + * @node: Device node to be parsed + * @csd: Parsed data from port endpoint node + * + * Return 0 on success or a negative error code on failure + */ +static int stfcamss_of_parse_endpoint_node(struct stfcamss *stfcamss, + struct device_node *node, + struct stfcamss_async_subdev *csd) +{ + struct v4l2_fwnode_endpoint vep = { { 0 } }; + int ret; + + ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(node), &vep); + if (ret) { + dev_err(stfcamss->dev, "endpoint not defined at %pOF\n", node); + return ret; + } + + csd->port = vep.base.port; + + return 0; +} + +/* + * stfcamss_of_parse_ports - Parse ports node + * @stfcamss: STFCAMSS device + * + * Return number of "port" nodes found in "ports" node + */ +static int stfcamss_of_parse_ports(struct stfcamss *stfcamss) +{ + struct device_node *node = NULL; + int ret, num_subdevs = 0; + + for_each_endpoint_of_node(stfcamss->dev->of_node, node) { + struct stfcamss_async_subdev *csd; + + if (!of_device_is_available(node)) + continue; + + csd = v4l2_async_nf_add_fwnode_remote(&stfcamss->notifier, + of_fwnode_handle(node), + struct stfcamss_async_subdev); + if (IS_ERR(csd)) { + ret = PTR_ERR(csd); + dev_err(stfcamss->dev, "failed to add async notifier\n"); + goto err_cleanup; + } + + ret = stfcamss_of_parse_endpoint_node(stfcamss, node, csd); + if (ret) + goto err_cleanup; + + num_subdevs++; + } + + return num_subdevs; + +err_cleanup: + of_node_put(node); + return ret; +} + +static int stfcamss_subdev_notifier_complete(struct v4l2_async_notifier *ntf) +{ + struct stfcamss *stfcamss = + container_of(ntf, struct stfcamss, notifier); + + return v4l2_device_register_subdev_nodes(&stfcamss->v4l2_dev); +} + +static const struct v4l2_async_notifier_operations +stfcamss_subdev_notifier_ops = { + .complete = stfcamss_subdev_notifier_complete, +}; + +static void stfcamss_mc_init(struct platform_device *pdev, + struct stfcamss *stfcamss) +{ + stfcamss->media_dev.dev = stfcamss->dev; + strscpy(stfcamss->media_dev.model, "Starfive Camera Subsystem", + sizeof(stfcamss->media_dev.model)); + media_device_init(&stfcamss->media_dev); + + stfcamss->v4l2_dev.mdev = &stfcamss->media_dev; +} + +/* + * stfcamss_probe - Probe STFCAMSS platform device + * @pdev: Pointer to STFCAMSS platform device + * + * Return 0 on success or a negative error code on failure + */ +static int stfcamss_probe(struct platform_device *pdev) +{ + struct stfcamss *stfcamss; + struct device *dev = &pdev->dev; + int ret, num_subdevs; + unsigned int i; + + stfcamss = devm_kzalloc(dev, sizeof(*stfcamss), GFP_KERNEL); + if (!stfcamss) + return -ENOMEM; + + stfcamss->dev = dev; + + stfcamss->nclks = ARRAY_SIZE(stfcamss->sys_clk); + for (i = 0; i < stfcamss->nclks; ++i) + stfcamss->sys_clk[i].id = stfcamss_clocks[i]; + ret = devm_clk_bulk_get(dev, stfcamss->nclks, stfcamss->sys_clk); + if (ret) { + dev_err(dev, "Failed to get clk controls\n"); + return ret; + } + + stfcamss->nrsts = ARRAY_SIZE(stfcamss->sys_rst); + for (i = 0; i < stfcamss->nrsts; ++i) + stfcamss->sys_rst[i].id = stfcamss_resets[i]; + ret = devm_reset_control_bulk_get_shared(dev, stfcamss->nrsts, + stfcamss->sys_rst); + if (ret) { + dev_err(dev, "Failed to get reset controls\n"); + return ret; + } + + ret = stfcamss_get_mem_res(stfcamss); + if (ret) { + dev_err(dev, "Could not map registers\n"); + return ret; + } + + platform_set_drvdata(pdev, stfcamss); + + v4l2_async_nf_init(&stfcamss->notifier, &stfcamss->v4l2_dev); + + num_subdevs = stfcamss_of_parse_ports(stfcamss); + if (num_subdevs < 0) { + ret = -ENODEV; + dev_err(dev, "Failed to get sub devices: %d\n", ret); + goto err_cleanup_notifier; + } + + stfcamss_mc_init(pdev, stfcamss); + + ret = v4l2_device_register(stfcamss->dev, &stfcamss->v4l2_dev); + if (ret < 0) { + dev_err(dev, "Failed to register V4L2 device: %d\n", ret); + goto err_cleanup_media_device; + } + + ret = media_device_register(&stfcamss->media_dev); + if (ret) { + dev_err(dev, "Failed to register media device: %d\n", ret); + goto err_unregister_device; + } + + pm_runtime_enable(dev); + + stfcamss->notifier.ops = &stfcamss_subdev_notifier_ops; + ret = v4l2_async_nf_register(&stfcamss->notifier); + if (ret) { + dev_err(dev, "Failed to register async subdev nodes: %d\n", + ret); + pm_runtime_disable(dev); + goto err_unregister_media_dev; + } + + return 0; + +err_unregister_media_dev: + media_device_unregister(&stfcamss->media_dev); +err_unregister_device: + v4l2_device_unregister(&stfcamss->v4l2_dev); +err_cleanup_media_device: + media_device_cleanup(&stfcamss->media_dev); +err_cleanup_notifier: + v4l2_async_nf_cleanup(&stfcamss->notifier); + return ret; +} + +/* + * stfcamss_remove - Remove STFCAMSS platform device + * @pdev: Pointer to STFCAMSS platform device + * + * Always returns 0. + */ +static int stfcamss_remove(struct platform_device *pdev) +{ + struct stfcamss *stfcamss = platform_get_drvdata(pdev); + + v4l2_device_unregister(&stfcamss->v4l2_dev); + media_device_cleanup(&stfcamss->media_dev); + v4l2_async_nf_cleanup(&stfcamss->notifier); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static const struct of_device_id stfcamss_of_match[] = { + { .compatible = "starfive,jh7110-camss" }, + { /* sentinel */ }, +}; + +MODULE_DEVICE_TABLE(of, stfcamss_of_match); + +static int __maybe_unused stfcamss_runtime_suspend(struct device *dev) +{ + struct stfcamss *stfcamss = dev_get_drvdata(dev); + int ret; + + ret = reset_control_bulk_assert(stfcamss->nrsts, stfcamss->sys_rst); + if (ret) { + dev_err(dev, "reset assert failed\n"); + return ret; + } + + clk_bulk_disable_unprepare(stfcamss->nclks, stfcamss->sys_clk); + + return 0; +} + +static int __maybe_unused stfcamss_runtime_resume(struct device *dev) +{ + struct stfcamss *stfcamss = dev_get_drvdata(dev); + int ret; + + ret = clk_bulk_prepare_enable(stfcamss->nclks, stfcamss->sys_clk); + if (ret) { + dev_err(dev, "clock prepare enable failed\n"); + return ret; + } + + ret = reset_control_bulk_deassert(stfcamss->nrsts, stfcamss->sys_rst); + if (ret < 0) { + dev_err(dev, "cannot deassert resets\n"); + clk_bulk_disable_unprepare(stfcamss->nclks, stfcamss->sys_clk); + return ret; + } + + return 0; +} + +static const struct dev_pm_ops stfcamss_pm_ops = { + SET_RUNTIME_PM_OPS(stfcamss_runtime_suspend, + stfcamss_runtime_resume, + NULL) +}; + +static struct platform_driver stfcamss_driver = { + .probe = stfcamss_probe, + .remove = stfcamss_remove, + .driver = { + .name = "starfive-camss", + .pm = &stfcamss_pm_ops, + .of_match_table = stfcamss_of_match, + }, +}; + +module_platform_driver(stfcamss_driver); + +MODULE_AUTHOR("Jack Zhu <jack.zhu@starfivetech.com>"); +MODULE_AUTHOR("Changhuang Liang <changhuang.liang@starfivetech.com>"); +MODULE_DESCRIPTION("StarFive Camera Subsystem driver"); +MODULE_LICENSE("GPL"); |