299 lines
7.1 KiB
C
299 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* shmob_drm_drv.c -- SH Mobile DRM driver
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*
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* Copyright (C) 2012 Renesas Electronics Corporation
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*
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_client_setup.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fbdev_dma.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_gem_dma_helper.h>
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#include <drm/drm_modeset_helper.h>
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#include <drm/drm_module.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_vblank.h>
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#include "shmob_drm_drv.h"
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#include "shmob_drm_kms.h"
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#include "shmob_drm_plane.h"
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#include "shmob_drm_regs.h"
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/* -----------------------------------------------------------------------------
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* Hardware initialization
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*/
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static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
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enum shmob_drm_clk_source clksrc)
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{
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struct clk *clk;
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char *clkname;
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switch (clksrc) {
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case SHMOB_DRM_CLK_BUS:
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clkname = "fck";
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sdev->lddckr = LDDCKR_ICKSEL_BUS;
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break;
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case SHMOB_DRM_CLK_PERIPHERAL:
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clkname = "media";
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sdev->lddckr = LDDCKR_ICKSEL_MIPI;
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break;
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case SHMOB_DRM_CLK_EXTERNAL:
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clkname = "lclk";
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sdev->lddckr = LDDCKR_ICKSEL_HDMI;
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break;
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default:
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return -EINVAL;
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}
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clk = devm_clk_get(sdev->dev, clkname);
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if (IS_ERR(clk)) {
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dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
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return PTR_ERR(clk);
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}
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sdev->clock = clk;
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return 0;
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}
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/* -----------------------------------------------------------------------------
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* DRM operations
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*/
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static irqreturn_t shmob_drm_irq(int irq, void *arg)
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{
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struct drm_device *dev = arg;
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struct shmob_drm_device *sdev = to_shmob_device(dev);
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unsigned long flags;
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u32 status;
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/* Acknowledge interrupts. Putting interrupt enable and interrupt flag
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* bits in the same register is really brain-dead design and requires
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* taking a spinlock.
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*/
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spin_lock_irqsave(&sdev->irq_lock, flags);
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status = lcdc_read(sdev, LDINTR);
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lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
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spin_unlock_irqrestore(&sdev->irq_lock, flags);
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if (status & LDINTR_VES) {
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drm_crtc_handle_vblank(&sdev->crtc.base);
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shmob_drm_crtc_finish_page_flip(&sdev->crtc);
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}
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return IRQ_HANDLED;
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}
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DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops);
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static const struct drm_driver shmob_drm_driver = {
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.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
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DRM_GEM_DMA_DRIVER_OPS,
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DRM_FBDEV_DMA_DRIVER_OPS,
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.fops = &shmob_drm_fops,
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.name = "shmob-drm",
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.desc = "Renesas SH Mobile DRM",
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.date = "20120424",
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.major = 1,
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.minor = 0,
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};
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/* -----------------------------------------------------------------------------
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* Power management
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*/
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static int shmob_drm_pm_suspend(struct device *dev)
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{
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struct shmob_drm_device *sdev = dev_get_drvdata(dev);
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return drm_mode_config_helper_suspend(&sdev->ddev);
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}
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static int shmob_drm_pm_resume(struct device *dev)
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{
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struct shmob_drm_device *sdev = dev_get_drvdata(dev);
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return drm_mode_config_helper_resume(&sdev->ddev);
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}
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static int shmob_drm_pm_runtime_suspend(struct device *dev)
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{
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struct shmob_drm_device *sdev = dev_get_drvdata(dev);
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if (sdev->clock)
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clk_disable_unprepare(sdev->clock);
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return 0;
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}
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static int shmob_drm_pm_runtime_resume(struct device *dev)
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{
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struct shmob_drm_device *sdev = dev_get_drvdata(dev);
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int ret;
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if (sdev->clock) {
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ret = clk_prepare_enable(sdev->clock);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static const struct dev_pm_ops shmob_drm_pm_ops = {
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SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
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RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend,
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shmob_drm_pm_runtime_resume, NULL)
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};
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/* -----------------------------------------------------------------------------
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* Platform driver
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*/
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static void shmob_drm_remove(struct platform_device *pdev)
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{
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struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
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struct drm_device *ddev = &sdev->ddev;
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drm_dev_unregister(ddev);
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drm_atomic_helper_shutdown(ddev);
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drm_kms_helper_poll_fini(ddev);
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}
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static void shmob_drm_shutdown(struct platform_device *pdev)
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{
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struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
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drm_atomic_helper_shutdown(&sdev->ddev);
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}
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static int shmob_drm_probe(struct platform_device *pdev)
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{
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struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
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const struct shmob_drm_config *config;
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struct shmob_drm_device *sdev;
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struct drm_device *ddev;
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int ret;
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config = of_device_get_match_data(&pdev->dev);
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if (!config && !pdata) {
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dev_err(&pdev->dev, "no platform data\n");
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return -EINVAL;
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}
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/*
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* Allocate and initialize the DRM device, driver private data, I/O
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* resources and clocks.
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*/
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sdev = devm_drm_dev_alloc(&pdev->dev, &shmob_drm_driver,
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struct shmob_drm_device, ddev);
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if (IS_ERR(sdev))
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return PTR_ERR(sdev);
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ddev = &sdev->ddev;
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sdev->dev = &pdev->dev;
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if (config) {
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sdev->config = *config;
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} else {
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sdev->pdata = pdata;
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sdev->config.clk_source = pdata->clk_source;
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sdev->config.clk_div = pdata->iface.clk_div;
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}
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spin_lock_init(&sdev->irq_lock);
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platform_set_drvdata(pdev, sdev);
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sdev->mmio = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(sdev->mmio))
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return PTR_ERR(sdev->mmio);
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ret = shmob_drm_setup_clocks(sdev, sdev->config.clk_source);
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if (ret < 0)
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return ret;
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ret = devm_pm_runtime_enable(&pdev->dev);
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if (ret)
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return ret;
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ret = drm_vblank_init(ddev, 1);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to initialize vblank\n");
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return ret;
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}
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ret = shmob_drm_modeset_init(sdev);
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if (ret < 0)
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return dev_err_probe(&pdev->dev, ret,
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"failed to initialize mode setting\n");
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ret = platform_get_irq(pdev, 0);
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if (ret < 0)
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goto err_modeset_cleanup;
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sdev->irq = ret;
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ret = devm_request_irq(&pdev->dev, sdev->irq, shmob_drm_irq, 0,
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ddev->driver->name, ddev);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to install IRQ handler\n");
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goto err_modeset_cleanup;
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}
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/*
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* Register the DRM device with the core and the connectors with
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* sysfs.
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*/
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ret = drm_dev_register(ddev, 0);
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if (ret < 0)
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goto err_modeset_cleanup;
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drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565);
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return 0;
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err_modeset_cleanup:
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drm_kms_helper_poll_fini(ddev);
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return ret;
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}
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static const struct shmob_drm_config shmob_arm_config = {
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.clk_source = SHMOB_DRM_CLK_BUS,
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.clk_div = 5,
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};
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static const struct of_device_id shmob_drm_of_table[] __maybe_unused = {
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{ .compatible = "renesas,r8a7740-lcdc", .data = &shmob_arm_config, },
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{ .compatible = "renesas,sh73a0-lcdc", .data = &shmob_arm_config, },
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{ /* sentinel */ }
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};
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static struct platform_driver shmob_drm_platform_driver = {
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.probe = shmob_drm_probe,
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.remove = shmob_drm_remove,
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.shutdown = shmob_drm_shutdown,
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.driver = {
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.name = "shmob-drm",
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.of_match_table = of_match_ptr(shmob_drm_of_table),
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.pm = &shmob_drm_pm_ops,
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},
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};
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drm_module_platform_driver(shmob_drm_platform_driver);
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MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
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MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
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MODULE_LICENSE("GPL");
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