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// SPDX-License-Identifier: GPL-2.0-only
/*
* (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
*/
/**
* DOC: ARM PrimeCell PL110 and PL111 CLCD Driver
*
* The PL110/PL111 is a simple LCD controller that can support TFT
* and STN displays. This driver exposes a standard KMS interface
* for them.
*
* 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 application software cursor layer.
*
* TODO:
*
* - Fix race between setting plane base address and getting IRQ for
* vsync firing the pageflip completion.
*
* - 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/dma-buf.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
#include <linux/shmem_fs.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "pl111_drm.h"
#include "pl111_versatile.h"
#include "pl111_nomadik.h"
#define DRIVER_DESC "DRM module for PL111"
static const struct drm_mode_config_funcs mode_config_funcs = {
.fb_create = drm_gem_fb_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;
struct device_node *np = dev->dev->of_node;
struct device_node *remote;
struct drm_panel *panel = NULL;
struct drm_bridge *bridge = NULL;
bool defer = false;
int ret;
int i;
ret = drmm_mode_config_init(dev);
if (ret)
return ret;
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;
i = 0;
for_each_endpoint_of_node(np, remote) {
struct drm_panel *tmp_panel;
struct drm_bridge *tmp_bridge;
dev_dbg(dev->dev, "checking endpoint %d\n", i);
ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
0, i,
&tmp_panel,
&tmp_bridge);
if (ret) {
if (ret == -EPROBE_DEFER) {
/*
* Something deferred, but that is often just
* another way of saying -ENODEV, but let's
* cast a vote for later deferral.
*/
defer = true;
} else if (ret != -ENODEV) {
/* Continue, maybe something else is working */
dev_err(dev->dev,
"endpoint %d returns %d\n", i, ret);
}
}
if (tmp_panel) {
dev_info(dev->dev,
"found panel on endpoint %d\n", i);
panel = tmp_panel;
}
if (tmp_bridge) {
dev_info(dev->dev,
"found bridge on endpoint %d\n", i);
bridge = tmp_bridge;
}
i++;
}
/*
* If we can't find neither panel nor bridge on any of the
* endpoints, and any of them retured -EPROBE_DEFER, then
* let's defer this driver too.
*/
if ((!panel && !bridge) && defer)
return -EPROBE_DEFER;
if (panel) {
bridge = drm_panel_bridge_add_typed(panel,
DRM_MODE_CONNECTOR_Unknown);
if (IS_ERR(bridge)) {
ret = PTR_ERR(bridge);
goto finish;
}
} else if (bridge) {
dev_info(dev->dev, "Using non-panel bridge\n");
} else {
dev_err(dev->dev, "No bridge, exiting\n");
return -ENODEV;
}
priv->bridge = bridge;
if (panel) {
priv->panel = panel;
priv->connector = drm_panel_bridge_connector(bridge);
}
ret = pl111_display_init(dev);
if (ret != 0) {
dev_err(dev->dev, "Failed to init display\n");
goto out_bridge;
}
ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
bridge);
if (ret)
return ret;
if (!priv->variant->broken_vblank) {
ret = drm_vblank_init(dev, 1);
if (ret != 0) {
dev_err(dev->dev, "Failed to init vblank\n");
goto out_bridge;
}
}
drm_mode_config_reset(dev);
drm_kms_helper_poll_init(dev);
goto finish;
out_bridge:
if (panel)
drm_panel_bridge_remove(bridge);
finish:
return ret;
}
static struct drm_gem_object *
pl111_gem_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt)
{
struct pl111_drm_dev_private *priv = dev->dev_private;
/*
* When using device-specific reserved memory we can't import
* DMA buffers: those are passed by reference in any global
* memory and we can only handle a specific range of memory.
*/
if (priv->use_device_memory)
return ERR_PTR(-EINVAL);
return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
}
DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
static const struct drm_driver pl111_drm_driver = {
.driver_features =
DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
.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,
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_import_sg_table = pl111_gem_import_sg_table,
.gem_prime_mmap = drm_gem_prime_mmap,
#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;
const struct pl111_variant_data *variant = id->data;
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->variant = variant;
ret = of_reserved_mem_device_init(dev);
if (!ret) {
dev_info(dev, "using device-specific reserved memory\n");
priv->use_device_memory = true;
}
if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
&priv->memory_bw)) {
dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
priv->memory_bw = 0;
}
/* The two main variants swap this register */
if (variant->is_pl110 || variant->is_lcdc) {
priv->ienb = CLCD_PL110_IENB;
priv->ctrl = CLCD_PL110_CNTL;
} else {
priv->ienb = CLCD_PL111_IENB;
priv->ctrl = CLCD_PL111_CNTL;
}
priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
if (IS_ERR(priv->regs)) {
dev_err(dev, "%s failed mmio\n", __func__);
ret = PTR_ERR(priv->regs);
goto dev_put;
}
/* This may override some variant settings */
ret = pl111_versatile_init(dev, priv);
if (ret)
goto dev_put;
pl111_nomadik_init(dev);
/* turn off interrupts before requesting the irq */
writel(0, priv->regs + priv->ienb);
ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
variant->name, 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_put;
ret = drm_dev_register(drm, 0);
if (ret < 0)
goto dev_put;
drm_fbdev_generic_setup(drm, priv->variant->fb_bpp);
return 0;
dev_put:
drm_dev_put(drm);
of_reserved_mem_device_release(dev);
return ret;
}
static void pl111_amba_remove(struct amba_device *amba_dev)
{
struct device *dev = &amba_dev->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->panel)
drm_panel_bridge_remove(priv->bridge);
drm_dev_put(drm);
of_reserved_mem_device_release(dev);
}
/*
* This early variant lacks the 565 and 444 pixel formats.
*/
static const u32 pl110_pixel_formats[] = {
DRM_FORMAT_ABGR8888,
DRM_FORMAT_XBGR8888,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB8888,
DRM_FORMAT_ABGR1555,
DRM_FORMAT_XBGR1555,
DRM_FORMAT_ARGB1555,
DRM_FORMAT_XRGB1555,
};
static const struct pl111_variant_data pl110_variant = {
.name = "PL110",
.is_pl110 = true,
.formats = pl110_pixel_formats,
.nformats = ARRAY_SIZE(pl110_pixel_formats),
.fb_bpp = 16,
};
/* RealView, Versatile Express etc use this modern variant */
static const u32 pl111_pixel_formats[] = {
DRM_FORMAT_ABGR8888,
DRM_FORMAT_XBGR8888,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB8888,
DRM_FORMAT_BGR565,
DRM_FORMAT_RGB565,
DRM_FORMAT_ABGR1555,
DRM_FORMAT_XBGR1555,
DRM_FORMAT_ARGB1555,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_ABGR4444,
DRM_FORMAT_XBGR4444,
DRM_FORMAT_ARGB4444,
DRM_FORMAT_XRGB4444,
};
static const struct pl111_variant_data pl111_variant = {
.name = "PL111",
.formats = pl111_pixel_formats,
.nformats = ARRAY_SIZE(pl111_pixel_formats),
.fb_bpp = 32,
};
static const u32 pl110_nomadik_pixel_formats[] = {
DRM_FORMAT_RGB888,
DRM_FORMAT_BGR888,
DRM_FORMAT_ABGR8888,
DRM_FORMAT_XBGR8888,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB8888,
DRM_FORMAT_BGR565,
DRM_FORMAT_RGB565,
DRM_FORMAT_ABGR1555,
DRM_FORMAT_XBGR1555,
DRM_FORMAT_ARGB1555,
DRM_FORMAT_XRGB1555,
DRM_FORMAT_ABGR4444,
DRM_FORMAT_XBGR4444,
DRM_FORMAT_ARGB4444,
DRM_FORMAT_XRGB4444,
};
static const struct pl111_variant_data pl110_nomadik_variant = {
.name = "LCDC (PL110 Nomadik)",
.formats = pl110_nomadik_pixel_formats,
.nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
.is_lcdc = true,
.st_bitmux_control = true,
.broken_vblank = true,
.fb_bpp = 16,
};
static const struct amba_id pl111_id_table[] = {
{
.id = 0x00041110,
.mask = 0x000fffff,
.data = (void *)&pl110_variant,
},
{
.id = 0x00180110,
.mask = 0x00fffffe,
.data = (void *)&pl110_nomadik_variant,
},
{
.id = 0x00041111,
.mask = 0x000fffff,
.data = (void *)&pl111_variant,
},
{0, 0},
};
MODULE_DEVICE_TABLE(amba, pl111_id_table);
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");