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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2025 Icenowy Zheng <uwu@icenowy.me>
*/
#include <linux/aperture.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/console.h>
#include <drm/clients/drm_client_setup.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_dumb_buffers.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "vs_bridge.h"
#include "vs_crtc.h"
#include "vs_dc.h"
#include "vs_dc_top_regs.h"
#include "vs_drm.h"
#define DRIVER_NAME "verisilicon"
#define DRIVER_DESC "Verisilicon DC-series display controller driver"
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
static int vs_gem_dumb_create(struct drm_file *file_priv,
struct drm_device *drm,
struct drm_mode_create_dumb *args)
{
int ret;
/* The hardware wants 128B-aligned pitches for linear buffers. */
ret = drm_mode_size_dumb(drm, args, 128, 0);
if (ret)
return ret;
return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
}
DEFINE_DRM_GEM_FOPS(vs_drm_driver_fops);
static const struct drm_driver vs_drm_driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
.fops = &vs_drm_driver_fops,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
/* GEM Operations */
DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(vs_gem_dumb_create),
DRM_FBDEV_DMA_DRIVER_OPS,
};
static const struct drm_mode_config_funcs vs_mode_config_funcs = {
.fb_create = drm_gem_fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static struct drm_mode_config_helper_funcs vs_mode_config_helper_funcs = {
.atomic_commit_tail = drm_atomic_helper_commit_tail,
};
static void vs_mode_config_init(struct drm_device *drm)
{
drm->mode_config.min_width = 0;
drm->mode_config.min_height = 0;
drm->mode_config.max_width = 8192;
drm->mode_config.max_height = 8192;
drm->mode_config.funcs = &vs_mode_config_funcs;
drm->mode_config.helper_private = &vs_mode_config_helper_funcs;
}
int vs_drm_initialize(struct vs_dc *dc, struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct vs_drm_dev *vdrm;
struct drm_device *drm;
struct vs_crtc *crtc;
struct vs_bridge *bridge;
unsigned int i;
int ret;
vdrm = devm_drm_dev_alloc(dev, &vs_drm_driver, struct vs_drm_dev, base);
if (IS_ERR(vdrm))
return PTR_ERR(vdrm);
drm = &vdrm->base;
vdrm->dc = dc;
dc->drm_dev = vdrm;
ret = drmm_mode_config_init(drm);
if (ret)
return ret;
/* Remove early framebuffers (ie. simple-framebuffer) */
ret = aperture_remove_all_conflicting_devices(DRIVER_NAME);
if (ret)
return ret;
for (i = 0; i < dc->identity.display_count; i++) {
crtc = vs_crtc_init(drm, dc, i);
if (IS_ERR(crtc))
return PTR_ERR(crtc);
bridge = vs_bridge_init(drm, crtc);
if (IS_ERR(bridge))
return PTR_ERR(bridge);
vdrm->crtcs[i] = crtc;
}
ret = drm_vblank_init(drm, dc->identity.display_count);
if (ret)
return ret;
vs_mode_config_init(drm);
/* Enable connectors polling */
drm_kms_helper_poll_init(drm);
drm_mode_config_reset(drm);
ret = drm_dev_register(drm, 0);
if (ret)
goto err_fini_poll;
drm_client_setup(drm, NULL);
return 0;
err_fini_poll:
drm_kms_helper_poll_fini(drm);
return ret;
}
void vs_drm_finalize(struct vs_dc *dc)
{
struct vs_drm_dev *vdrm = dc->drm_dev;
struct drm_device *drm = &vdrm->base;
drm_dev_unregister(drm);
drm_kms_helper_poll_fini(drm);
drm_atomic_helper_shutdown(drm);
dc->drm_dev = NULL;
}
void vs_drm_shutdown_handler(struct vs_dc *dc)
{
struct vs_drm_dev *vdrm = dc->drm_dev;
drm_atomic_helper_shutdown(&vdrm->base);
}
void vs_drm_handle_irq(struct vs_dc *dc, u32 irqs)
{
unsigned int i;
for (i = 0; i < dc->identity.display_count; i++) {
if (irqs & VSDC_TOP_IRQ_VSYNC(i)) {
irqs &= ~VSDC_TOP_IRQ_VSYNC(i);
if (dc->drm_dev->crtcs[i])
drm_crtc_handle_vblank(&dc->drm_dev->crtcs[i]->base);
}
}
if (irqs)
drm_warn_once(&dc->drm_dev->base,
"Unknown Verisilicon DC interrupt 0x%x fired!\n",
irqs);
}
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