/*
* (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
*
* Parts of this file were based on sources as follows:
*
* Copyright (c) 2006-2008 Intel Corporation
* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
* Copyright (C) 2011 Texas Instruments
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms of
* such GNU licence.
*
*/
/**
* DOC: ARM PrimeCell PL111 CLCD Driver
*
* The PL111 is a simple LCD controller that can support TFT and STN
* displays. This driver exposes a standard KMS interface for them.
*
* This driver uses the same Device Tree binding as the fbdev CLCD
* driver. While the fbdev driver supports panels that may be
* connected to the CLCD internally to the CLCD driver, in DRM the
* panels get split out to drivers/gpu/drm/panels/. This means that,
* in converting from using fbdev to using DRM, you also need to write
* a panel driver (which may be as simple as an entry in
* panel-simple.c).
*
* The driver currently doesn't expose the cursor. The DRM API for
* cursors requires support for 64x64 ARGB8888 cursor images, while
* the hardware can only support 64x64 monochrome with masking
* cursors. While one could imagine trying to hack something together
* to look at the ARGB8888 and program reasonable in monochrome, we
* just don't expose the cursor at all instead, and leave cursor
* support to the X11 software cursor layer.
*
* TODO:
*
* - Fix race between setting plane base address and getting IRQ for
* vsync firing the pageflip completion.
*
* - Expose the correct set of formats we can support based on the
* "arm,pl11x,tft-r0g0b0-pads" DT property.
*
* - Use the "max-memory-bandwidth" DT property to filter the
* supported formats.
*
* - Read back hardware state at boot to skip reprogramming the
* hardware when doing a no-op modeset.
*
* - Use the CLKSEL bit to support switching between the two external
* clock parents.
*/
#include <linux/amba/bus.h>
#include <linux/amba/clcd-regs.h>
#include <linux/version.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include "pl111_drm.h"
#define DRIVER_DESC "DRM module for PL111"
static struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = drm_fb_cma_create,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static int pl111_modeset_init(struct drm_device *dev)
{
struct drm_mode_config *mode_config;
struct pl111_drm_dev_private *priv = dev->dev_private;
int ret = 0;
drm_mode_config_init(dev);
mode_config = &dev->mode_config;
mode_config->funcs = &mode_config_funcs;
mode_config->min_width = 1;
mode_config->max_width = 1024;
mode_config->min_height = 1;
mode_config->max_height = 768;
ret = pl111_connector_init(dev);
if (ret) {
dev_err(dev->dev, "Failed to create pl111_drm_connector\n");
goto out_config;
}
/* Don't actually attach if we didn't find a drm_panel
* attached to us. This will allow a kernel to include both
* the fbdev pl111 driver and this one, and choose between
* them based on which subsystem has support for the panel.
*/
if (!priv->connector.panel) {
dev_info(dev->dev,
"Disabling due to lack of DRM panel device.\n");
ret = -ENODEV;
goto out_config;
}
ret = pl111_display_init(dev);
if (ret != 0) {
dev_err(dev->dev, "Failed to init display\n");
goto out_config;
}
ret = drm_vblank_init(dev, 1);
if (ret != 0) {
dev_err(dev->dev, "Failed to init vblank\n");
goto out_config;
}
drm_mode_config_reset(dev);
priv->fbdev = drm_fbdev_cma_init(dev, 32,
dev->mode_config.num_connector);
drm_kms_helper_poll_init(dev);
goto finish;
out_config:
drm_mode_config_cleanup(dev);
finish:
return ret;
}
DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
static void pl111_lastclose(struct drm_device *dev)
{
struct pl111_drm_dev_private *priv = dev->dev_private;
drm_fbdev_cma_restore_mode(priv->fbdev);
}
static struct drm_driver pl111_drm_driver = {
.driver_features =
DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
.lastclose = pl111_lastclose,
.ioctls = NULL,
.fops = &drm_fops,
.name = "pl111",
.desc = DRIVER_DESC,
.date = "20170317",
.major = 1,
.minor = 0,
.patchlevel = 0,
.dumb_create = drm_gem_cma_dumb_create,
.dumb_destroy = drm_gem_dumb_destroy,
.dumb_map_offset = drm_gem_cma_dumb_map_offset,
.gem_free_object_unlocked = drm_gem_cma_free_object,
.gem_vm_ops = &drm_gem_cma_vm_ops,
.enable_vblank = pl111_enable_vblank,
.disable_vblank = pl111_disable_vblank,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import = drm_gem_prime_import,
.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
.gem_prime_export = drm_gem_prime_export,
.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
#if defined(CONFIG_DEBUG_FS)
.debugfs_init = pl111_debugfs_init,
#endif
};
static int pl111_amba_probe(struct amba_device *amba_dev,
const struct amba_id *id)
{
struct device *dev = &amba_dev->dev;
struct pl111_drm_dev_private *priv;
struct drm_device *drm;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
drm = drm_dev_alloc(&pl111_drm_driver, dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
amba_set_drvdata(amba_dev, drm);
priv->drm = drm;
drm->dev_private = priv;
priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
if (IS_ERR(priv->regs)) {
dev_err(dev, "%s failed mmio\n", __func__);
return PTR_ERR(priv->regs);
}
/* turn off interrupts before requesting the irq */
writel(0, priv->regs + CLCD_PL111_IENB);
ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
"pl111", priv);
if (ret != 0) {
dev_err(dev, "%s failed irq %d\n", __func__, ret);
return ret;
}
ret = pl111_modeset_init(drm);
if (ret != 0)
goto dev_unref;
ret = drm_dev_register(drm, 0);
if (ret < 0)
goto dev_unref;
return 0;
dev_unref:
drm_dev_unref(drm);
return ret;
}
static int pl111_amba_remove(struct amba_device *amba_dev)
{
struct drm_device *drm = amba_get_drvdata(amba_dev);
struct pl111_drm_dev_private *priv = drm->dev_private;
drm_dev_unregister(drm);
if (priv->fbdev)
drm_fbdev_cma_fini(priv->fbdev);
drm_mode_config_cleanup(drm);
drm_dev_unref(drm);
return 0;
}
static struct amba_id pl111_id_table[] = {
{
.id = 0x00041111,
.mask = 0x000fffff,
},
{0, 0},
};
static struct amba_driver pl111_amba_driver __maybe_unused = {
.drv = {
.name = "drm-clcd-pl111",
},
.probe = pl111_amba_probe,
.remove = pl111_amba_remove,
.id_table = pl111_id_table,
};
#ifdef CONFIG_ARM_AMBA
module_amba_driver(pl111_amba_driver);
#endif
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("ARM Ltd.");
MODULE_LICENSE("GPL");
