// SPDX-License-Identifier: GPL-2.0+ /* * shmob_drm_drv.c -- SH Mobile DRM driver * * Copyright (C) 2012 Renesas Electronics Corporation * * Laurent Pinchart (laurent.pinchart@ideasonboard.com) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "shmob_drm_drv.h" #include "shmob_drm_kms.h" #include "shmob_drm_plane.h" #include "shmob_drm_regs.h" /* ----------------------------------------------------------------------------- * Hardware initialization */ static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev, enum shmob_drm_clk_source clksrc) { struct clk *clk; char *clkname; switch (clksrc) { case SHMOB_DRM_CLK_BUS: clkname = "fck"; sdev->lddckr = LDDCKR_ICKSEL_BUS; break; case SHMOB_DRM_CLK_PERIPHERAL: clkname = "media"; sdev->lddckr = LDDCKR_ICKSEL_MIPI; break; case SHMOB_DRM_CLK_EXTERNAL: clkname = "lclk"; sdev->lddckr = LDDCKR_ICKSEL_HDMI; break; default: return -EINVAL; } clk = devm_clk_get(sdev->dev, clkname); if (IS_ERR(clk)) { dev_err(sdev->dev, "cannot get dot clock %s\n", clkname); return PTR_ERR(clk); } sdev->clock = clk; return 0; } /* ----------------------------------------------------------------------------- * DRM operations */ static irqreturn_t shmob_drm_irq(int irq, void *arg) { struct drm_device *dev = arg; struct shmob_drm_device *sdev = to_shmob_device(dev); unsigned long flags; u32 status; /* Acknowledge interrupts. Putting interrupt enable and interrupt flag * bits in the same register is really brain-dead design and requires * taking a spinlock. */ spin_lock_irqsave(&sdev->irq_lock, flags); status = lcdc_read(sdev, LDINTR); lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK); spin_unlock_irqrestore(&sdev->irq_lock, flags); if (status & LDINTR_VES) { drm_crtc_handle_vblank(&sdev->crtc.base); shmob_drm_crtc_finish_page_flip(&sdev->crtc); } return IRQ_HANDLED; } DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops); static const struct drm_driver shmob_drm_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET, DRM_GEM_DMA_DRIVER_OPS, .fops = &shmob_drm_fops, .name = "shmob-drm", .desc = "Renesas SH Mobile DRM", .date = "20120424", .major = 1, .minor = 0, }; /* ----------------------------------------------------------------------------- * Power management */ static int shmob_drm_pm_suspend(struct device *dev) { struct shmob_drm_device *sdev = dev_get_drvdata(dev); drm_kms_helper_poll_disable(&sdev->ddev); shmob_drm_crtc_suspend(&sdev->crtc); return 0; } static int shmob_drm_pm_resume(struct device *dev) { struct shmob_drm_device *sdev = dev_get_drvdata(dev); drm_modeset_lock_all(&sdev->ddev); shmob_drm_crtc_resume(&sdev->crtc); drm_modeset_unlock_all(&sdev->ddev); drm_kms_helper_poll_enable(&sdev->ddev); return 0; } static int shmob_drm_pm_runtime_suspend(struct device *dev) { struct shmob_drm_device *sdev = dev_get_drvdata(dev); if (sdev->clock) clk_disable_unprepare(sdev->clock); return 0; } static int shmob_drm_pm_runtime_resume(struct device *dev) { struct shmob_drm_device *sdev = dev_get_drvdata(dev); int ret; if (sdev->clock) { ret = clk_prepare_enable(sdev->clock); if (ret < 0) return ret; } return 0; } static const struct dev_pm_ops shmob_drm_pm_ops = { SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume) RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend, shmob_drm_pm_runtime_resume, NULL) }; /* ----------------------------------------------------------------------------- * Platform driver */ static void shmob_drm_remove(struct platform_device *pdev) { struct shmob_drm_device *sdev = platform_get_drvdata(pdev); struct drm_device *ddev = &sdev->ddev; drm_dev_unregister(ddev); drm_kms_helper_poll_fini(ddev); } static int shmob_drm_probe(struct platform_device *pdev) { struct shmob_drm_platform_data *pdata = pdev->dev.platform_data; struct shmob_drm_device *sdev; struct drm_device *ddev; int ret; if (pdata == NULL) { dev_err(&pdev->dev, "no platform data\n"); return -EINVAL; } /* * Allocate and initialize the DRM device, driver private data, I/O * resources and clocks. */ sdev = devm_drm_dev_alloc(&pdev->dev, &shmob_drm_driver, struct shmob_drm_device, ddev); if (IS_ERR(sdev)) return PTR_ERR(sdev); ddev = &sdev->ddev; sdev->dev = &pdev->dev; sdev->pdata = pdata; spin_lock_init(&sdev->irq_lock); platform_set_drvdata(pdev, sdev); sdev->mmio = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(sdev->mmio)) return PTR_ERR(sdev->mmio); ret = shmob_drm_setup_clocks(sdev, pdata->clk_source); if (ret < 0) return ret; ret = devm_pm_runtime_enable(&pdev->dev); if (ret) return ret; ret = drm_vblank_init(ddev, 1); if (ret < 0) { dev_err(&pdev->dev, "failed to initialize vblank\n"); return ret; } ret = shmob_drm_modeset_init(sdev); if (ret < 0) return dev_err_probe(&pdev->dev, ret, "failed to initialize mode setting\n"); ret = platform_get_irq(pdev, 0); if (ret < 0) goto err_modeset_cleanup; sdev->irq = ret; ret = devm_request_irq(&pdev->dev, sdev->irq, shmob_drm_irq, 0, ddev->driver->name, ddev); if (ret < 0) { dev_err(&pdev->dev, "failed to install IRQ handler\n"); goto err_modeset_cleanup; } /* * Register the DRM device with the core and the connectors with * sysfs. */ ret = drm_dev_register(ddev, 0); if (ret < 0) goto err_modeset_cleanup; drm_fbdev_generic_setup(ddev, 16); return 0; err_modeset_cleanup: drm_kms_helper_poll_fini(ddev); return ret; } static struct platform_driver shmob_drm_platform_driver = { .probe = shmob_drm_probe, .remove_new = shmob_drm_remove, .driver = { .name = "shmob-drm", .pm = &shmob_drm_pm_ops, }, }; drm_module_platform_driver(shmob_drm_platform_driver); MODULE_AUTHOR("Laurent Pinchart "); MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver"); MODULE_LICENSE("GPL");