// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017 Linus Walleij <[email protected]>
* Parts of this file were based on sources as follows:
*
* Copyright (C) 2006-2008 Intel Corporation
* Copyright (C) 2007 Amos Lee <[email protected]>
* Copyright (C) 2007 Dave Airlie <[email protected]>
* Copyright (C) 2011 Texas Instruments
* Copyright (C) 2017 Eric Anholt
*/
/**
* DOC: Faraday TV Encoder TVE200 DRM Driver
*
* The Faraday TV Encoder TVE200 is also known as the Gemini TV Interface
* Controller (TVC) and is found in the Gemini Chipset from Storlink
* Semiconductor (later Storm Semiconductor, later Cortina Systems)
* but also in the Grain Media GM8180 chipset. On the Gemini the module
* is connected to 8 data lines and a single clock line, comprising an
* 8-bit BT.656 interface.
*
* This is a very basic YUV display driver. The datasheet specifies that
* it supports the ITU BT.656 standard. It requires a 27 MHz clock which is
* the hallmark of any TV encoder supporting both PAL and NTSC.
*
* This driver exposes a standard KMS interface for this TV encoder.
*/
#include <linux/clk.h>
#include <linux/dma-buf.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/shmem_fs.h>
#include <linux/slab.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_module.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "tve200_drm.h"
#define DRIVER_DESC "DRM module for Faraday TVE200"
static const struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = drm_gem_fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static int tve200_modeset_init(struct drm_device *dev)
{
struct drm_mode_config *mode_config;
struct tve200_drm_dev_private *priv = dev->dev_private;
struct drm_panel *panel;
struct drm_bridge *bridge;
int ret;
drm_mode_config_init(dev);
mode_config = &dev->mode_config;
mode_config->funcs = &mode_config_funcs;
mode_config->min_width = 352;
mode_config->max_width = 720;
mode_config->min_height = 240;
mode_config->max_height = 576;
ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
0, 0, &panel, &bridge);
if (ret && ret != -ENODEV)
return ret;
if (panel) {
bridge = drm_panel_bridge_add_typed(panel,
DRM_MODE_CONNECTOR_Unknown);
if (IS_ERR(bridge)) {
ret = PTR_ERR(bridge);
goto out_bridge;
}
} else {
/*
* TODO: when we are using a different bridge than a panel
* (such as a dumb VGA connector) we need to devise a different
* method to get the connector out of the bridge.
*/
dev_err(dev->dev, "the bridge is not a panel\n");
ret = -EINVAL;
goto out_bridge;
}
ret = tve200_display_init(dev);
if (ret) {
dev_err(dev->dev, "failed to init display\n");
goto out_bridge;
}
ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
bridge);
if (ret) {
dev_err(dev->dev, "failed to attach bridge\n");
goto out_bridge;
}
priv->panel = panel;
priv->connector = drm_panel_bridge_connector(bridge);
priv->bridge = bridge;
dev_info(dev->dev, "attached to panel %s\n",
dev_name(panel->dev));
ret = drm_vblank_init(dev, 1);
if (ret) {
dev_err(dev->dev, "failed to init vblank\n");
goto out_bridge;
}
drm_mode_config_reset(dev);
drm_kms_helper_poll_init(dev);
goto finish;
out_bridge:
if (panel)
drm_panel_bridge_remove(bridge);
drm_mode_config_cleanup(dev);
finish:
return ret;
}
DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
static const struct drm_driver tve200_drm_driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
.ioctls = NULL,
.fops = &drm_fops,
.name = "tve200",
.desc = DRIVER_DESC,
.date = "20170703",
.major = 1,
.minor = 0,
.patchlevel = 0,
DRM_GEM_DMA_DRIVER_OPS,
};
static int tve200_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct tve200_drm_dev_private *priv;
struct drm_device *drm;
int irq;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
drm = drm_dev_alloc(&tve200_drm_driver, dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
platform_set_drvdata(pdev, drm);
priv->drm = drm;
drm->dev_private = priv;
/* Clock the silicon so we can access the registers */
priv->pclk = devm_clk_get(dev, "PCLK");
if (IS_ERR(priv->pclk)) {
dev_err(dev, "unable to get PCLK\n");
ret = PTR_ERR(priv->pclk);
goto dev_unref;
}
ret = clk_prepare_enable(priv->pclk);
if (ret) {
dev_err(dev, "failed to enable PCLK\n");
goto dev_unref;
}
/* This clock is for the pixels (27MHz) */
priv->clk = devm_clk_get(dev, "TVE");
if (IS_ERR(priv->clk)) {
dev_err(dev, "unable to get TVE clock\n");
ret = PTR_ERR(priv->clk);
goto clk_disable;
}
priv->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->regs)) {
dev_err(dev, "%s failed mmio\n", __func__);
ret = -EINVAL;
goto clk_disable;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
ret = irq;
goto clk_disable;
}
/* turn off interrupts before requesting the irq */
writel(0, priv->regs + TVE200_INT_EN);
ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
if (ret) {
dev_err(dev, "failed to request irq %d\n", ret);
goto clk_disable;
}
ret = tve200_modeset_init(drm);
if (ret)
goto clk_disable;
ret = drm_dev_register(drm, 0);
if (ret < 0)
goto clk_disable;
/*
* Passing in 16 here will make the RGB565 mode the default
* Passing in 32 will use XRGB8888 mode
*/
drm_fbdev_dma_setup(drm, 16);
return 0;
clk_disable:
clk_disable_unprepare(priv->pclk);
dev_unref:
drm_dev_put(drm);
return ret;
}
static void tve200_remove(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
struct tve200_drm_dev_private *priv = drm->dev_private;
drm_dev_unregister(drm);
drm_atomic_helper_shutdown(drm);
if (priv->panel)
drm_panel_bridge_remove(priv->bridge);
drm_mode_config_cleanup(drm);
clk_disable_unprepare(priv->pclk);
drm_dev_put(drm);
}
static void tve200_shutdown(struct platform_device *pdev)
{
drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
}
static const struct of_device_id tve200_of_match[] = {
{
.compatible = "faraday,tve200",
},
{},
};
static struct platform_driver tve200_driver = {
.driver = {
.name = "tve200",
.of_match_table = tve200_of_match,
},
.probe = tve200_probe,
.remove_new = tve200_remove,
.shutdown = tve200_shutdown,
};
drm_module_platform_driver(tve200_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Linus Walleij <[email protected]>");
MODULE_LICENSE("GPL");
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