drm/stm: Add STM32 LTDC driver

This controller provides output signals to interface directly a variety
of LCD and TFT panels. These output signals are: RGB signals
(up to 24bpp), vertical & horizontal synchronisations, data enable and
the pixel clock.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/1492164819-10513-5-git-send-email-yannick.fertre@st.com
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Yannick Fertre 2017-04-14 12:13:34 +02:00 committed by Eric Anholt
parent 7121926d4c
commit b759012c5f
7 changed files with 1447 additions and 0 deletions

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@ -246,6 +246,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig"
source "drivers/gpu/drm/tegra/Kconfig"
source "drivers/gpu/drm/stm/Kconfig"
source "drivers/gpu/drm/panel/Kconfig"
source "drivers/gpu/drm/bridge/Kconfig"

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@ -82,6 +82,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/
obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
obj-$(CONFIG_DRM_MSM) += msm/
obj-$(CONFIG_DRM_TEGRA) += tegra/
obj-$(CONFIG_DRM_STM) += stm/
obj-$(CONFIG_DRM_STI) += sti/
obj-$(CONFIG_DRM_IMX) += imx/
obj-$(CONFIG_DRM_MEDIATEK) += mediatek/

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@ -0,0 +1,16 @@
config DRM_STM
tristate "DRM Support for STMicroelectronics SoC Series"
depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM)
select DRM_KMS_HELPER
select DRM_GEM_CMA_HELPER
select DRM_KMS_CMA_HELPER
select DRM_PANEL
select VIDEOMODE_HELPERS
select FB_PROVIDE_GET_FB_UNMAPPED_AREA
default y
help
Enable support for the on-chip display controller on
STMicroelectronics STM32 MCUs.
To compile this driver as a module, choose M here: the module
will be called stm-drm.

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@ -0,0 +1,7 @@
ccflags-y := -Iinclude/drm
stm-drm-y := \
drv.o \
ltdc.o
obj-$(CONFIG_DRM_STM) += stm-drm.o

221
drivers/gpu/drm/stm/drv.c Normal file
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@ -0,0 +1,221 @@
/*
* 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>
*
* License terms: GNU General Public License (GPL), version 2
*/
#include <linux/component.h>
#include <linux/of_platform.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include "ltdc.h"
#define DRIVER_NAME "stm"
#define DRIVER_DESC "STMicroelectronics SoC DRM"
#define DRIVER_DATE "20170330"
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
#define DRIVER_PATCH_LEVEL 0
#define STM_MAX_FB_WIDTH 2048
#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
static void drv_output_poll_changed(struct drm_device *ddev)
{
struct ltdc_device *ldev = ddev->dev_private;
drm_fbdev_cma_hotplug_event(ldev->fbdev);
}
static const struct drm_mode_config_funcs drv_mode_config_funcs = {
.fb_create = drm_fb_cma_create,
.output_poll_changed = drv_output_poll_changed,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static void drv_lastclose(struct drm_device *ddev)
{
struct ltdc_device *ldev = ddev->dev_private;
DRM_DEBUG("%s\n", __func__);
drm_fbdev_cma_restore_mode(ldev->fbdev);
}
DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
static struct drm_driver drv_driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
DRIVER_ATOMIC,
.lastclose = drv_lastclose,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.patchlevel = DRIVER_PATCH_LEVEL,
.fops = &drv_driver_fops,
.dumb_create = drm_gem_cma_dumb_create,
.dumb_map_offset = drm_gem_cma_dumb_map_offset,
.dumb_destroy = drm_gem_dumb_destroy,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_free_object_unlocked = drm_gem_cma_free_object,
.gem_vm_ops = &drm_gem_cma_vm_ops,
.gem_prime_export = drm_gem_prime_export,
.gem_prime_import = drm_gem_prime_import,
.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
.gem_prime_vmap = drm_gem_cma_prime_vmap,
.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
.gem_prime_mmap = drm_gem_cma_prime_mmap,
.enable_vblank = ltdc_crtc_enable_vblank,
.disable_vblank = ltdc_crtc_disable_vblank,
};
static int drv_load(struct drm_device *ddev)
{
struct platform_device *pdev = to_platform_device(ddev->dev);
struct drm_fbdev_cma *fbdev;
struct ltdc_device *ldev;
int ret;
DRM_DEBUG("%s\n", __func__);
ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
if (!ldev)
return -ENOMEM;
ddev->dev_private = (void *)ldev;
drm_mode_config_init(ddev);
/*
* 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;
ret = ltdc_load(ddev);
if (ret)
goto err;
drm_mode_config_reset(ddev);
drm_kms_helper_poll_init(ddev);
if (ddev->mode_config.num_connector) {
ldev = ddev->dev_private;
fbdev = drm_fbdev_cma_init(ddev, 16,
ddev->mode_config.num_connector);
if (IS_ERR(fbdev)) {
DRM_DEBUG("Warning: fails to create fbdev\n");
fbdev = NULL;
}
ldev->fbdev = fbdev;
}
platform_set_drvdata(pdev, ddev);
return 0;
err:
drm_mode_config_cleanup(ddev);
return ret;
}
static void drv_unload(struct drm_device *ddev)
{
struct ltdc_device *ldev = ddev->dev_private;
DRM_DEBUG("%s\n", __func__);
if (ldev->fbdev) {
drm_fbdev_cma_fini(ldev->fbdev);
ldev->fbdev = NULL;
}
drm_kms_helper_poll_fini(ddev);
ltdc_unload(ddev);
drm_mode_config_cleanup(ddev);
}
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__);
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_unref;
ret = drm_dev_register(ddev, 0);
if (ret)
goto err_unref;
return 0;
err_unref:
drm_dev_unref(ddev);
return ret;
}
static int 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_unref(ddev);
return 0;
}
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,
.driver = {
.name = DRIVER_NAME,
.of_match_table = drv_dt_ids,
},
};
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");

1160
drivers/gpu/drm/stm/ltdc.c Normal file

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@ -0,0 +1,40 @@
/*
* 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>
*
* License terms: GNU General Public License (GPL), version 2
*/
#ifndef _LTDC_H_
#define _LTDC_H_
struct ltdc_caps {
u32 hw_version; /* hardware version */
u32 nb_layers; /* number of supported layers */
u32 reg_ofs; /* register offset for applicable regs */
u32 bus_width; /* bus width (32 or 64 bits) */
const u32 *pix_fmt_hw; /* supported pixel formats */
};
struct ltdc_device {
struct drm_fbdev_cma *fbdev;
void __iomem *regs;
struct clk *pixel_clk; /* lcd pixel clock */
struct drm_panel *panel;
struct mutex err_lock; /* protecting error_status */
struct ltdc_caps caps;
u32 clut[256]; /* color look up table */
u32 error_status;
u32 irq_status;
};
int ltdc_crtc_enable_vblank(struct drm_device *dev, unsigned int pipe);
void ltdc_crtc_disable_vblank(struct drm_device *dev, unsigned int pipe);
int ltdc_load(struct drm_device *ddev);
void ltdc_unload(struct drm_device *ddev);
#endif