diff options
Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_drv.c')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_drv.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_drv.c b/drivers/media/platform/vsp1/vsp1_drv.c new file mode 100644 index 000000000000..e58e49c88415 --- /dev/null +++ b/drivers/media/platform/vsp1/vsp1_drv.c @@ -0,0 +1,492 @@ +/* + * vsp1_drv.c -- R-Car VSP1 Driver + * + * Copyright (C) 2013 Renesas Corporation + * + * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/videodev2.h> + +#include "vsp1.h" +#include "vsp1_lif.h" +#include "vsp1_rwpf.h" +#include "vsp1_uds.h" + +/* ----------------------------------------------------------------------------- + * Interrupt Handling + */ + +static irqreturn_t vsp1_irq_handler(int irq, void *data) +{ + u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE; + struct vsp1_device *vsp1 = data; + irqreturn_t ret = IRQ_NONE; + unsigned int i; + + for (i = 0; i < VPS1_MAX_WPF; ++i) { + struct vsp1_rwpf *wpf = vsp1->wpf[i]; + struct vsp1_pipeline *pipe; + u32 status; + + if (wpf == NULL) + continue; + + pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity); + status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i)); + vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask); + + if (status & VI6_WFP_IRQ_STA_FRE) { + vsp1_pipeline_frame_end(pipe); + ret = IRQ_HANDLED; + } + } + + return ret; +} + +/* ----------------------------------------------------------------------------- + * Entities + */ + +/* + * vsp1_create_links - Create links from all sources to the given sink + * + * This function creates media links from all valid sources to the given sink + * pad. Links that would be invalid according to the VSP1 hardware capabilities + * are skipped. Those include all links + * + * - from a UDS to a UDS (UDS entities can't be chained) + * - from an entity to itself (no loops are allowed) + */ +static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink) +{ + struct media_entity *entity = &sink->subdev.entity; + struct vsp1_entity *source; + unsigned int pad; + int ret; + + list_for_each_entry(source, &vsp1->entities, list_dev) { + u32 flags; + + if (source->type == sink->type) + continue; + + if (source->type == VSP1_ENTITY_LIF || + source->type == VSP1_ENTITY_WPF) + continue; + + flags = source->type == VSP1_ENTITY_RPF && + sink->type == VSP1_ENTITY_WPF && + source->index == sink->index + ? MEDIA_LNK_FL_ENABLED : 0; + + for (pad = 0; pad < entity->num_pads; ++pad) { + if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK)) + continue; + + ret = media_entity_create_link(&source->subdev.entity, + source->source_pad, + entity, pad, flags); + if (ret < 0) + return ret; + } + } + + return 0; +} + +static void vsp1_destroy_entities(struct vsp1_device *vsp1) +{ + struct vsp1_entity *entity; + struct vsp1_entity *next; + + list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) { + list_del(&entity->list_dev); + vsp1_entity_destroy(entity); + } + + v4l2_device_unregister(&vsp1->v4l2_dev); + media_device_unregister(&vsp1->media_dev); +} + +static int vsp1_create_entities(struct vsp1_device *vsp1) +{ + struct media_device *mdev = &vsp1->media_dev; + struct v4l2_device *vdev = &vsp1->v4l2_dev; + struct vsp1_entity *entity; + unsigned int i; + int ret; + + mdev->dev = vsp1->dev; + strlcpy(mdev->model, "VSP1", sizeof(mdev->model)); + ret = media_device_register(mdev); + if (ret < 0) { + dev_err(vsp1->dev, "media device registration failed (%d)\n", + ret); + return ret; + } + + vdev->mdev = mdev; + ret = v4l2_device_register(vsp1->dev, vdev); + if (ret < 0) { + dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n", + ret); + goto done; + } + + /* Instantiate all the entities. */ + if (vsp1->pdata->features & VSP1_HAS_LIF) { + vsp1->lif = vsp1_lif_create(vsp1); + if (IS_ERR(vsp1->lif)) { + ret = PTR_ERR(vsp1->lif); + goto done; + } + + list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities); + } + + for (i = 0; i < vsp1->pdata->rpf_count; ++i) { + struct vsp1_rwpf *rpf; + + rpf = vsp1_rpf_create(vsp1, i); + if (IS_ERR(rpf)) { + ret = PTR_ERR(rpf); + goto done; + } + + vsp1->rpf[i] = rpf; + list_add_tail(&rpf->entity.list_dev, &vsp1->entities); + } + + for (i = 0; i < vsp1->pdata->uds_count; ++i) { + struct vsp1_uds *uds; + + uds = vsp1_uds_create(vsp1, i); + if (IS_ERR(uds)) { + ret = PTR_ERR(uds); + goto done; + } + + vsp1->uds[i] = uds; + list_add_tail(&uds->entity.list_dev, &vsp1->entities); + } + + for (i = 0; i < vsp1->pdata->wpf_count; ++i) { + struct vsp1_rwpf *wpf; + + wpf = vsp1_wpf_create(vsp1, i); + if (IS_ERR(wpf)) { + ret = PTR_ERR(wpf); + goto done; + } + + vsp1->wpf[i] = wpf; + list_add_tail(&wpf->entity.list_dev, &vsp1->entities); + } + + /* Create links. */ + list_for_each_entry(entity, &vsp1->entities, list_dev) { + if (entity->type == VSP1_ENTITY_LIF || + entity->type == VSP1_ENTITY_RPF) + continue; + + ret = vsp1_create_links(vsp1, entity); + if (ret < 0) + goto done; + } + + if (vsp1->pdata->features & VSP1_HAS_LIF) { + ret = media_entity_create_link( + &vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE, + &vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0); + if (ret < 0) + return ret; + } + + /* Register all subdevs. */ + list_for_each_entry(entity, &vsp1->entities, list_dev) { + ret = v4l2_device_register_subdev(&vsp1->v4l2_dev, + &entity->subdev); + if (ret < 0) + goto done; + } + + ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev); + +done: + if (ret < 0) + vsp1_destroy_entities(vsp1); + + return ret; +} + +static int vsp1_device_init(struct vsp1_device *vsp1) +{ + unsigned int i; + u32 status; + + /* Reset any channel that might be running. */ + status = vsp1_read(vsp1, VI6_STATUS); + + for (i = 0; i < VPS1_MAX_WPF; ++i) { + unsigned int timeout; + + if (!(status & VI6_STATUS_SYS_ACT(i))) + continue; + + vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i)); + for (timeout = 10; timeout > 0; --timeout) { + status = vsp1_read(vsp1, VI6_STATUS); + if (!(status & VI6_STATUS_SYS_ACT(i))) + break; + + usleep_range(1000, 2000); + } + + if (!timeout) { + dev_err(vsp1->dev, "failed to reset wpf.%u\n", i); + return -ETIMEDOUT; + } + } + + vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) | + (8 << VI6_CLK_DCSWT_CSTRW_SHIFT)); + + for (i = 0; i < VPS1_MAX_RPF; ++i) + vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED); + + for (i = 0; i < VPS1_MAX_UDS; ++i) + vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED); + + vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED); + vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED); + vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED); + vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED); + vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED); + vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED); + + vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) | + (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT)); + vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) | + (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT)); + + return 0; +} + +/* + * vsp1_device_get - Acquire the VSP1 device + * + * Increment the VSP1 reference count and initialize the device if the first + * reference is taken. + * + * Return a pointer to the VSP1 device or NULL if an error occured. + */ +struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1) +{ + struct vsp1_device *__vsp1 = vsp1; + int ret; + + mutex_lock(&vsp1->lock); + if (vsp1->ref_count > 0) + goto done; + + ret = clk_prepare_enable(vsp1->clock); + if (ret < 0) { + __vsp1 = NULL; + goto done; + } + + ret = vsp1_device_init(vsp1); + if (ret < 0) { + clk_disable_unprepare(vsp1->clock); + __vsp1 = NULL; + goto done; + } + +done: + if (__vsp1) + vsp1->ref_count++; + + mutex_unlock(&vsp1->lock); + return __vsp1; +} + +/* + * vsp1_device_put - Release the VSP1 device + * + * Decrement the VSP1 reference count and cleanup the device if the last + * reference is released. + */ +void vsp1_device_put(struct vsp1_device *vsp1) +{ + mutex_lock(&vsp1->lock); + + if (--vsp1->ref_count == 0) + clk_disable_unprepare(vsp1->clock); + + mutex_unlock(&vsp1->lock); +} + +/* ----------------------------------------------------------------------------- + * Power Management + */ + +#ifdef CONFIG_PM_SLEEP +static int vsp1_pm_suspend(struct device *dev) +{ + struct vsp1_device *vsp1 = dev_get_drvdata(dev); + + WARN_ON(mutex_is_locked(&vsp1->lock)); + + if (vsp1->ref_count == 0) + return 0; + + clk_disable_unprepare(vsp1->clock); + return 0; +} + +static int vsp1_pm_resume(struct device *dev) +{ + struct vsp1_device *vsp1 = dev_get_drvdata(dev); + + WARN_ON(mutex_is_locked(&vsp1->lock)); + + if (vsp1->ref_count) + return 0; + + return clk_prepare_enable(vsp1->clock); +} +#endif + +static const struct dev_pm_ops vsp1_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume) +}; + +/* ----------------------------------------------------------------------------- + * Platform Driver + */ + +static struct vsp1_platform_data * +vsp1_get_platform_data(struct platform_device *pdev) +{ + struct vsp1_platform_data *pdata = pdev->dev.platform_data; + + if (pdata == NULL) { + dev_err(&pdev->dev, "missing platform data\n"); + return NULL; + } + + if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) { + dev_err(&pdev->dev, "invalid number of RPF (%u)\n", + pdata->rpf_count); + return NULL; + } + + if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) { + dev_err(&pdev->dev, "invalid number of UDS (%u)\n", + pdata->uds_count); + return NULL; + } + + if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) { + dev_err(&pdev->dev, "invalid number of WPF (%u)\n", + pdata->wpf_count); + return NULL; + } + + return pdata; +} + +static int vsp1_probe(struct platform_device *pdev) +{ + struct vsp1_device *vsp1; + struct resource *irq; + struct resource *io; + int ret; + + vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL); + if (vsp1 == NULL) + return -ENOMEM; + + vsp1->dev = &pdev->dev; + mutex_init(&vsp1->lock); + INIT_LIST_HEAD(&vsp1->entities); + + vsp1->pdata = vsp1_get_platform_data(pdev); + if (vsp1->pdata == NULL) + return -ENODEV; + + /* I/O, IRQ and clock resources */ + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + vsp1->mmio = devm_ioremap_resource(&pdev->dev, io); + if (IS_ERR((void *)vsp1->mmio)) + return PTR_ERR((void *)vsp1->mmio); + + vsp1->clock = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(vsp1->clock)) { + dev_err(&pdev->dev, "failed to get clock\n"); + return PTR_ERR(vsp1->clock); + } + + irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!irq) { + dev_err(&pdev->dev, "missing IRQ\n"); + return -EINVAL; + } + + ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler, + IRQF_SHARED, dev_name(&pdev->dev), vsp1); + if (ret < 0) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + return ret; + } + + /* Instanciate entities */ + ret = vsp1_create_entities(vsp1); + if (ret < 0) { + dev_err(&pdev->dev, "failed to create entities\n"); + return ret; + } + + platform_set_drvdata(pdev, vsp1); + + return 0; +} + +static int vsp1_remove(struct platform_device *pdev) +{ + struct vsp1_device *vsp1 = platform_get_drvdata(pdev); + + vsp1_destroy_entities(vsp1); + + return 0; +} + +static struct platform_driver vsp1_platform_driver = { + .probe = vsp1_probe, + .remove = vsp1_remove, + .driver = { + .owner = THIS_MODULE, + .name = "vsp1", + .pm = &vsp1_pm_ops, + }, +}; + +module_platform_driver(vsp1_platform_driver); + +MODULE_ALIAS("vsp1"); +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_DESCRIPTION("Renesas VSP1 Driver"); +MODULE_LICENSE("GPL"); |
