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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) STMicroelectronics SA 2017
*
* Authors: Philippe Cornu <philippe.cornu@st.com>
* Yannick Fertre <yannick.fertre@st.com>
* Fabien Dessenne <fabien.dessenne@st.com>
* Mickael Reulier <mickael.reulier@st.com>
*/
#include <linux/aperture.h>
#include <linux/component.h>
#include <linux/dma-mapping.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_client_setup.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_module.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include <drm/drm_managed.h>
#include "ltdc.h"
#define STM_MAX_FB_WIDTH 2048
#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
static const struct drm_mode_config_funcs drv_mode_config_funcs = {
.fb_create = drm_gem_fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static int stm_gem_dma_dumb_create(struct drm_file *file,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
/*
* in order to optimize data transfer, pitch is aligned on
* 128 bytes, height is aligned on 4 bytes
*/
args->pitch = roundup(min_pitch, 128);
args->height = roundup(args->height, 4);
return drm_gem_dma_dumb_create_internal(file, dev, args);
}
DEFINE_DRM_GEM_DMA_FOPS(drv_driver_fops);
static const struct drm_driver drv_driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
.name = "stm",
.desc = "STMicroelectronics SoC DRM",
.date = "20170330",
.major = 1,
.minor = 0,
.patchlevel = 0,
.fops = &drv_driver_fops,
DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(stm_gem_dma_dumb_create),
DRM_FBDEV_DMA_DRIVER_OPS,
};
static int drv_load(struct drm_device *ddev)
{
struct platform_device *pdev = to_platform_device(ddev->dev);
struct ltdc_device *ldev;
int ret;
DRM_DEBUG("%s\n", __func__);
ldev = drmm_kzalloc(ddev, sizeof(*ldev), GFP_KERNEL);
if (!ldev)
return -ENOMEM;
ddev->dev_private = (void *)ldev;
ret = drmm_mode_config_init(ddev);
if (ret)
return ret;
/*
* set max width and height as default value.
* this value would be used to check framebuffer size limitation
* at drm_mode_addfb().
*/
ddev->mode_config.min_width = 0;
ddev->mode_config.min_height = 0;
ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
ddev->mode_config.funcs = &drv_mode_config_funcs;
ddev->mode_config.normalize_zpos = true;
ret = ltdc_load(ddev);
if (ret)
return ret;
drm_mode_config_reset(ddev);
drm_kms_helper_poll_init(ddev);
platform_set_drvdata(pdev, ddev);
return 0;
}
static void drv_unload(struct drm_device *ddev)
{
DRM_DEBUG("%s\n", __func__);
drm_kms_helper_poll_fini(ddev);
drm_atomic_helper_shutdown(ddev);
ltdc_unload(ddev);
}
static __maybe_unused int drv_suspend(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct ltdc_device *ldev = ddev->dev_private;
struct drm_atomic_state *state;
WARN_ON(ldev->suspend_state);
state = drm_atomic_helper_suspend(ddev);
if (IS_ERR(state))
return PTR_ERR(state);
ldev->suspend_state = state;
pm_runtime_force_suspend(dev);
return 0;
}
static __maybe_unused int drv_resume(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct ltdc_device *ldev = ddev->dev_private;
int ret;
if (WARN_ON(!ldev->suspend_state))
return -ENOENT;
pm_runtime_force_resume(dev);
ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
if (ret)
pm_runtime_force_suspend(dev);
ldev->suspend_state = NULL;
return ret;
}
static __maybe_unused int drv_runtime_suspend(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
DRM_DEBUG_DRIVER("\n");
ltdc_suspend(ddev);
return 0;
}
static __maybe_unused int drv_runtime_resume(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
DRM_DEBUG_DRIVER("\n");
return ltdc_resume(ddev);
}
static const struct dev_pm_ops drv_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
SET_RUNTIME_PM_OPS(drv_runtime_suspend,
drv_runtime_resume, NULL)
};
static int stm_drm_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct drm_device *ddev;
int ret;
DRM_DEBUG("%s\n", __func__);
ret = aperture_remove_all_conflicting_devices(drv_driver.name);
if (ret)
return ret;
dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
ddev = drm_dev_alloc(&drv_driver, dev);
if (IS_ERR(ddev))
return PTR_ERR(ddev);
ret = drv_load(ddev);
if (ret)
goto err_put;
ret = drm_dev_register(ddev, 0);
if (ret)
goto err_unload;
drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565);
return 0;
err_unload:
drv_unload(ddev);
err_put:
drm_dev_put(ddev);
return ret;
}
static void stm_drm_platform_remove(struct platform_device *pdev)
{
struct drm_device *ddev = platform_get_drvdata(pdev);
DRM_DEBUG("%s\n", __func__);
drm_dev_unregister(ddev);
drv_unload(ddev);
drm_dev_put(ddev);
}
static void stm_drm_platform_shutdown(struct platform_device *pdev)
{
drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
}
static const struct of_device_id drv_dt_ids[] = {
{ .compatible = "st,stm32-ltdc"},
{ /* end node */ },
};
MODULE_DEVICE_TABLE(of, drv_dt_ids);
static struct platform_driver stm_drm_platform_driver = {
.probe = stm_drm_platform_probe,
.remove = stm_drm_platform_remove,
.shutdown = stm_drm_platform_shutdown,
.driver = {
.name = "stm32-display",
.of_match_table = drv_dt_ids,
.pm = &drv_pm_ops,
},
};
drm_module_platform_driver(stm_drm_platform_driver);
MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
MODULE_LICENSE("GPL v2");
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