// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Marek Vasut <[email protected]>
*
* This code is based on drivers/video/fbdev/mxsfb.c :
* Copyright (C) 2010 Juergen Beisert, Pengutronix
* Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/pm_runtime.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_connector.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_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 "mxsfb_drv.h"
#include "mxsfb_regs.h"
enum mxsfb_devtype {
MXSFB_V3,
MXSFB_V4,
/*
* Starting at i.MX6 the hardware version register is gone, use the
* i.MX family number as the version.
*/
MXSFB_V6,
};
static const struct mxsfb_devdata mxsfb_devdata[] = {
[MXSFB_V3] = {
.transfer_count = LCDC_V3_TRANSFER_COUNT,
.cur_buf = LCDC_V3_CUR_BUF,
.next_buf = LCDC_V3_NEXT_BUF,
.hs_wdth_mask = 0xff,
.hs_wdth_shift = 24,
.has_overlay = false,
.has_ctrl2 = false,
.has_crc32 = false,
},
[MXSFB_V4] = {
.transfer_count = LCDC_V4_TRANSFER_COUNT,
.cur_buf = LCDC_V4_CUR_BUF,
.next_buf = LCDC_V4_NEXT_BUF,
.hs_wdth_mask = 0x3fff,
.hs_wdth_shift = 18,
.has_overlay = false,
.has_ctrl2 = true,
.has_crc32 = true,
},
[MXSFB_V6] = {
.transfer_count = LCDC_V4_TRANSFER_COUNT,
.cur_buf = LCDC_V4_CUR_BUF,
.next_buf = LCDC_V4_NEXT_BUF,
.hs_wdth_mask = 0x3fff,
.hs_wdth_shift = 18,
.has_overlay = true,
.has_ctrl2 = true,
.has_crc32 = true,
},
};
void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
{
clk_prepare_enable(mxsfb->clk_axi);
}
void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
{
clk_disable_unprepare(mxsfb->clk_axi);
}
static struct drm_framebuffer *
mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
const struct drm_format_info *info;
info = drm_get_format_info(dev, mode_cmd);
if (!info)
return ERR_PTR(-EINVAL);
if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) {
dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n");
return ERR_PTR(-EINVAL);
}
return drm_gem_fb_create(dev, file_priv, mode_cmd);
}
static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
.fb_create = mxsfb_fb_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};
static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb)
{
struct drm_device *drm = mxsfb->drm;
struct drm_connector_list_iter iter;
struct drm_panel *panel;
struct drm_bridge *bridge;
int ret;
ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
&bridge);
if (ret)
return ret;
if (panel) {
bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel,
DRM_MODE_CONNECTOR_DPI);
if (IS_ERR(bridge))
return PTR_ERR(bridge);
}
if (!bridge)
return -ENODEV;
ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0);
if (ret)
return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
mxsfb->bridge = bridge;
/*
* Get hold of the connector. This is a bit of a hack, until the bridge
* API gives us bus flags and formats.
*/
drm_connector_list_iter_begin(drm, &iter);
mxsfb->connector = drm_connector_list_iter_next(&iter);
drm_connector_list_iter_end(&iter);
return 0;
}
static irqreturn_t mxsfb_irq_handler(int irq, void *data)
{
struct drm_device *drm = data;
struct mxsfb_drm_private *mxsfb = drm->dev_private;
u32 reg, crc;
u64 vbc;
reg = readl(mxsfb->base + LCDC_CTRL1);
if (reg & CTRL1_CUR_FRAME_DONE_IRQ) {
drm_crtc_handle_vblank(&mxsfb->crtc);
if (mxsfb->crc_active) {
crc = readl(mxsfb->base + LCDC_V4_CRC_STAT);
vbc = drm_crtc_accurate_vblank_count(&mxsfb->crtc);
drm_crtc_add_crc_entry(&mxsfb->crtc, true, vbc, &crc);
}
}
writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
return IRQ_HANDLED;
}
static void mxsfb_irq_disable(struct drm_device *drm)
{
struct mxsfb_drm_private *mxsfb = drm->dev_private;
mxsfb_enable_axi_clk(mxsfb);
/* Disable and clear VBLANK IRQ */
writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
mxsfb_disable_axi_clk(mxsfb);
}
static int mxsfb_irq_install(struct drm_device *dev, int irq)
{
if (irq == IRQ_NOTCONNECTED)
return -ENOTCONN;
mxsfb_irq_disable(dev);
return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev);
}
static void mxsfb_irq_uninstall(struct drm_device *dev)
{
struct mxsfb_drm_private *mxsfb = dev->dev_private;
mxsfb_irq_disable(dev);
free_irq(mxsfb->irq, dev);
}
static int mxsfb_load(struct drm_device *drm,
const struct mxsfb_devdata *devdata)
{
struct platform_device *pdev = to_platform_device(drm->dev);
struct mxsfb_drm_private *mxsfb;
struct resource *res;
int ret;
mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
if (!mxsfb)
return -ENOMEM;
mxsfb->drm = drm;
drm->dev_private = mxsfb;
mxsfb->devdata = devdata;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mxsfb->base = devm_ioremap_resource(drm->dev, res);
if (IS_ERR(mxsfb->base))
return PTR_ERR(mxsfb->base);
mxsfb->clk = devm_clk_get(drm->dev, NULL);
if (IS_ERR(mxsfb->clk))
return PTR_ERR(mxsfb->clk);
mxsfb->clk_axi = devm_clk_get_optional(drm->dev, "axi");
if (IS_ERR(mxsfb->clk_axi))
return PTR_ERR(mxsfb->clk_axi);
mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
if (IS_ERR(mxsfb->clk_disp_axi))
mxsfb->clk_disp_axi = NULL;
ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
if (ret)
return ret;
pm_runtime_enable(drm->dev);
/* Modeset init */
ret = drmm_mode_config_init(drm);
if (ret) {
dev_err(drm->dev, "Failed to initialize mode config\n");
goto err_vblank;
}
ret = mxsfb_kms_init(mxsfb);
if (ret < 0) {
dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
goto err_vblank;
}
ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
if (ret < 0) {
dev_err(drm->dev, "Failed to initialise vblank\n");
goto err_vblank;
}
/* Start with vertical blanking interrupt reporting disabled. */
drm_crtc_vblank_off(&mxsfb->crtc);
ret = mxsfb_attach_bridge(mxsfb);
if (ret) {
dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
goto err_vblank;
}
drm->mode_config.min_width = MXSFB_MIN_XRES;
drm->mode_config.min_height = MXSFB_MIN_YRES;
drm->mode_config.max_width = MXSFB_MAX_XRES;
drm->mode_config.max_height = MXSFB_MAX_YRES;
drm->mode_config.funcs = &mxsfb_mode_config_funcs;
drm->mode_config.helper_private = &mxsfb_mode_config_helpers;
drm_mode_config_reset(drm);
ret = platform_get_irq(pdev, 0);
if (ret < 0)
goto err_vblank;
mxsfb->irq = ret;
pm_runtime_get_sync(drm->dev);
ret = mxsfb_irq_install(drm, mxsfb->irq);
pm_runtime_put_sync(drm->dev);
if (ret < 0) {
dev_err(drm->dev, "Failed to install IRQ handler\n");
goto err_vblank;
}
drm_kms_helper_poll_init(drm);
platform_set_drvdata(pdev, drm);
drm_helper_hpd_irq_event(drm);
return 0;
err_vblank:
pm_runtime_disable(drm->dev);
return ret;
}
static void mxsfb_unload(struct drm_device *drm)
{
drm_kms_helper_poll_fini(drm);
pm_runtime_get_sync(drm->dev);
mxsfb_irq_uninstall(drm);
pm_runtime_put_sync(drm->dev);
drm->dev_private = NULL;
pm_runtime_disable(drm->dev);
}
DEFINE_DRM_GEM_DMA_FOPS(fops);
static const struct drm_driver mxsfb_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
DRM_GEM_DMA_DRIVER_OPS,
.fops = &fops,
.name = "mxsfb-drm",
.desc = "MXSFB Controller DRM",
.date = "20160824",
.major = 1,
.minor = 0,
};
static const struct of_device_id mxsfb_dt_ids[] = {
{ .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], },
{ .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], },
{ .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
static int mxsfb_probe(struct platform_device *pdev)
{
struct drm_device *drm;
int ret;
drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
ret = mxsfb_load(drm, device_get_match_data(&pdev->dev));
if (ret)
goto err_free;
ret = drm_dev_register(drm, 0);
if (ret)
goto err_unload;
drm_fbdev_dma_setup(drm, 32);
return 0;
err_unload:
mxsfb_unload(drm);
err_free:
drm_dev_put(drm);
return ret;
}
static void mxsfb_remove(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
drm_dev_unregister(drm);
drm_atomic_helper_shutdown(drm);
mxsfb_unload(drm);
drm_dev_put(drm);
}
static void mxsfb_shutdown(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
drm_atomic_helper_shutdown(drm);
}
#ifdef CONFIG_PM_SLEEP
static int mxsfb_suspend(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
return drm_mode_config_helper_suspend(drm);
}
static int mxsfb_resume(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
return drm_mode_config_helper_resume(drm);
}
#endif
static const struct dev_pm_ops mxsfb_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
};
static struct platform_driver mxsfb_platform_driver = {
.probe = mxsfb_probe,
.remove_new = mxsfb_remove,
.shutdown = mxsfb_shutdown,
.driver = {
.name = "mxsfb",
.of_match_table = mxsfb_dt_ids,
.pm = &mxsfb_pm_ops,
},
};
drm_module_platform_driver(mxsfb_platform_driver);
MODULE_AUTHOR("Marek Vasut <[email protected]>");
MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
MODULE_LICENSE("GPL");
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