#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <drm/clients/drm_client_setup.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_drv.h>
#include <drm/drm_encoder.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_mode_config.h>
#include <drm/drm_module.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "lcdif_drv.h"
#include "lcdif_regs.h"
static const struct drm_mode_config_funcs lcdif_mode_config_funcs = {
.fb_create = drm_gem_fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};
static const struct drm_encoder_funcs lcdif_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
{
struct device *dev = lcdif->drm->dev;
struct device_node *ep;
struct drm_bridge *bridge;
int ret;
for_each_endpoint_of_node(dev->of_node, ep) {
struct device_node *remote;
struct of_endpoint of_ep;
struct drm_encoder *encoder;
remote = of_graph_get_remote_port_parent(ep);
if (!of_device_is_available(remote)) {
of_node_put(remote);
continue;
}
of_node_put(remote);
ret = of_graph_parse_endpoint(ep, &of_ep);
if (ret < 0) {
dev_err(dev, "Failed to parse endpoint %pOF\n", ep);
of_node_put(ep);
return ret;
}
bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, of_ep.id);
if (IS_ERR(bridge)) {
of_node_put(ep);
return dev_err_probe(dev, PTR_ERR(bridge),
"Failed to get bridge for endpoint%u\n",
of_ep.id);
}
encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
if (!encoder) {
dev_err(dev, "Failed to allocate encoder for endpoint%u\n",
of_ep.id);
of_node_put(ep);
return -ENOMEM;
}
encoder->possible_crtcs = drm_crtc_mask(&lcdif->crtc);
ret = drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
DRM_MODE_ENCODER_NONE, NULL);
if (ret) {
dev_err(dev, "Failed to initialize encoder for endpoint%u: %d\n",
of_ep.id, ret);
of_node_put(ep);
return ret;
}
ret = drm_bridge_attach(encoder, bridge, NULL, 0);
if (ret) {
of_node_put(ep);
return dev_err_probe(dev, ret,
"Failed to attach bridge for endpoint%u\n",
of_ep.id);
}
}
return 0;
}
static irqreturn_t lcdif_irq_handler(int irq, void *data)
{
struct drm_device *drm = data;
struct lcdif_drm_private *lcdif = drm->dev_private;
u32 reg, stat;
stat = readl(lcdif->base + LCDC_V8_INT_STATUS_D0);
if (!stat)
return IRQ_NONE;
if (stat & INT_STATUS_D0_VS_BLANK) {
reg = readl(lcdif->base + LCDC_V8_CTRLDESCL0_5);
if (!(reg & CTRLDESCL0_5_SHADOW_LOAD_EN))
drm_crtc_handle_vblank(&lcdif->crtc);
}
writel(stat, lcdif->base + LCDC_V8_INT_STATUS_D0);
return IRQ_HANDLED;
}
static int lcdif_load(struct drm_device *drm)
{
struct platform_device *pdev = to_platform_device(drm->dev);
struct lcdif_drm_private *lcdif;
int ret;
lcdif = devm_kzalloc(&pdev->dev, sizeof(*lcdif), GFP_KERNEL);
if (!lcdif)
return -ENOMEM;
lcdif->drm = drm;
drm->dev_private = lcdif;
lcdif->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(lcdif->base))
return PTR_ERR(lcdif->base);
lcdif->clk = devm_clk_get(drm->dev, "pix");
if (IS_ERR(lcdif->clk))
return PTR_ERR(lcdif->clk);
lcdif->clk_axi = devm_clk_get(drm->dev, "axi");
if (IS_ERR(lcdif->clk_axi))
return PTR_ERR(lcdif->clk_axi);
lcdif->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
if (IS_ERR(lcdif->clk_disp_axi))
return PTR_ERR(lcdif->clk_disp_axi);
platform_set_drvdata(pdev, drm);
ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(36));
if (ret)
return ret;
ret = drmm_mode_config_init(drm);
if (ret) {
dev_err(drm->dev, "Failed to initialize mode config\n");
return ret;
}
ret = lcdif_kms_init(lcdif);
if (ret < 0) {
dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
return ret;
}
ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
if (ret < 0) {
dev_err(drm->dev, "Failed to initialise vblank\n");
return ret;
}
drm_crtc_vblank_off(&lcdif->crtc);
ret = lcdif_attach_bridge(lcdif);
if (ret)
return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
drm->mode_config.min_width = LCDIF_MIN_XRES;
drm->mode_config.min_height = LCDIF_MIN_YRES;
drm->mode_config.max_width = LCDIF_MAX_XRES;
drm->mode_config.max_height = LCDIF_MAX_YRES;
drm->mode_config.funcs = &lcdif_mode_config_funcs;
drm->mode_config.helper_private = &lcdif_mode_config_helpers;
drm_mode_config_reset(drm);
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
lcdif->irq = ret;
ret = devm_request_irq(drm->dev, lcdif->irq, lcdif_irq_handler, 0,
drm->driver->name, drm);
if (ret < 0) {
dev_err(drm->dev, "Failed to install IRQ handler\n");
return ret;
}
drm_kms_helper_poll_init(drm);
drm_helper_hpd_irq_event(drm);
pm_runtime_enable(drm->dev);
return 0;
}
static void lcdif_unload(struct drm_device *drm)
{
struct lcdif_drm_private *lcdif = drm->dev_private;
pm_runtime_get_sync(drm->dev);
drm_crtc_vblank_off(&lcdif->crtc);
drm_kms_helper_poll_fini(drm);
pm_runtime_put_sync(drm->dev);
pm_runtime_disable(drm->dev);
drm->dev_private = NULL;
}
DEFINE_DRM_GEM_DMA_FOPS(fops);
static const struct drm_driver lcdif_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
DRM_GEM_DMA_DRIVER_OPS,
DRM_FBDEV_DMA_DRIVER_OPS,
.fops = &fops,
.name = "imx-lcdif",
.desc = "i.MX LCDIF Controller DRM",
.major = 1,
.minor = 0,
};
static const struct of_device_id lcdif_dt_ids[] = {
{ .compatible = "fsl,imx8mp-lcdif" },
{ .compatible = "fsl,imx93-lcdif" },
{ }
};
MODULE_DEVICE_TABLE(of, lcdif_dt_ids);
static int lcdif_probe(struct platform_device *pdev)
{
struct drm_device *drm;
int ret;
drm = drm_dev_alloc(&lcdif_driver, &pdev->dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
ret = lcdif_load(drm);
if (ret)
goto err_free;
ret = drm_dev_register(drm, 0);
if (ret)
goto err_unload;
drm_client_setup(drm, NULL);
return 0;
err_unload:
lcdif_unload(drm);
err_free:
drm_dev_put(drm);
return ret;
}
static void lcdif_remove(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
drm_dev_unregister(drm);
drm_atomic_helper_shutdown(drm);
lcdif_unload(drm);
drm_dev_put(drm);
}
static void lcdif_shutdown(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
drm_atomic_helper_shutdown(drm);
}
static int __maybe_unused lcdif_rpm_suspend(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct lcdif_drm_private *lcdif = drm->dev_private;
clk_disable_unprepare(lcdif->clk);
clk_disable_unprepare(lcdif->clk_disp_axi);
clk_disable_unprepare(lcdif->clk_axi);
return 0;
}
static int __maybe_unused lcdif_rpm_resume(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct lcdif_drm_private *lcdif = drm->dev_private;
clk_prepare_enable(lcdif->clk_axi);
clk_prepare_enable(lcdif->clk_disp_axi);
clk_prepare_enable(lcdif->clk);
return 0;
}
static int __maybe_unused lcdif_suspend(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
int ret;
ret = drm_mode_config_helper_suspend(drm);
if (ret)
return ret;
if (pm_runtime_suspended(dev))
return 0;
return lcdif_rpm_suspend(dev);
}
static int __maybe_unused lcdif_resume(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
if (!pm_runtime_suspended(dev))
lcdif_rpm_resume(dev);
return drm_mode_config_helper_resume(drm);
}
static const struct dev_pm_ops lcdif_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(lcdif_suspend, lcdif_resume)
SET_RUNTIME_PM_OPS(lcdif_rpm_suspend, lcdif_rpm_resume, NULL)
};
static struct platform_driver lcdif_platform_driver = {
.probe = lcdif_probe,
.remove = lcdif_remove,
.shutdown = lcdif_shutdown,
.driver = {
.name = "imx-lcdif",
.of_match_table = lcdif_dt_ids,
.pm = &lcdif_pm_ops,
},
};
drm_module_platform_driver(lcdif_platform_driver);
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_DESCRIPTION("Freescale LCDIF DRM/KMS driver");
MODULE_LICENSE("GPL");
