451 lines
11 KiB
C
451 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
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*
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* Parts of this file were based on sources as follows:
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*
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* Copyright (c) 2006-2008 Intel Corporation
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* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
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* Copyright (C) 2011 Texas Instruments
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*/
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/**
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* DOC: ARM PrimeCell PL110 and PL111 CLCD Driver
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*
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* The PL110/PL111 is a simple LCD controller that can support TFT
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* and STN displays. This driver exposes a standard KMS interface
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* for them.
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*
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* The driver currently doesn't expose the cursor. The DRM API for
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* cursors requires support for 64x64 ARGB8888 cursor images, while
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* the hardware can only support 64x64 monochrome with masking
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* cursors. While one could imagine trying to hack something together
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* to look at the ARGB8888 and program reasonable in monochrome, we
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* just don't expose the cursor at all instead, and leave cursor
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* support to the application software cursor layer.
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*
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* TODO:
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*
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* - Fix race between setting plane base address and getting IRQ for
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* vsync firing the pageflip completion.
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*
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* - Read back hardware state at boot to skip reprogramming the
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* hardware when doing a no-op modeset.
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*
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* - Use the CLKSEL bit to support switching between the two external
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* clock parents.
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*/
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#include <linux/amba/bus.h>
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#include <linux/dma-buf.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_graph.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/shmem_fs.h>
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#include <linux/slab.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fbdev_dma.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_gem_dma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_of.h>
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#include <drm/drm_panel.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_vblank.h>
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#include "pl111_drm.h"
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#include "pl111_versatile.h"
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#include "pl111_nomadik.h"
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#define DRIVER_DESC "DRM module for PL111"
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static const struct drm_mode_config_funcs mode_config_funcs = {
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.fb_create = drm_gem_fb_create,
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.atomic_check = drm_atomic_helper_check,
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.atomic_commit = drm_atomic_helper_commit,
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};
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static int pl111_modeset_init(struct drm_device *dev)
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{
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struct drm_mode_config *mode_config;
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struct pl111_drm_dev_private *priv = dev->dev_private;
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struct device_node *np = dev->dev->of_node;
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struct device_node *remote;
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struct drm_panel *panel = NULL;
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struct drm_bridge *bridge = NULL;
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bool defer = false;
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int ret;
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int i;
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ret = drmm_mode_config_init(dev);
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if (ret)
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return ret;
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mode_config = &dev->mode_config;
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mode_config->funcs = &mode_config_funcs;
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mode_config->min_width = 1;
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mode_config->max_width = 1024;
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mode_config->min_height = 1;
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mode_config->max_height = 768;
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i = 0;
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for_each_endpoint_of_node(np, remote) {
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struct drm_panel *tmp_panel;
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struct drm_bridge *tmp_bridge;
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dev_dbg(dev->dev, "checking endpoint %d\n", i);
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ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
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0, i,
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&tmp_panel,
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&tmp_bridge);
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if (ret) {
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if (ret == -EPROBE_DEFER) {
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/*
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* Something deferred, but that is often just
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* another way of saying -ENODEV, but let's
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* cast a vote for later deferral.
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*/
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defer = true;
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} else if (ret != -ENODEV) {
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/* Continue, maybe something else is working */
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dev_err(dev->dev,
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"endpoint %d returns %d\n", i, ret);
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}
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}
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if (tmp_panel) {
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dev_info(dev->dev,
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"found panel on endpoint %d\n", i);
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panel = tmp_panel;
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}
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if (tmp_bridge) {
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dev_info(dev->dev,
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"found bridge on endpoint %d\n", i);
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bridge = tmp_bridge;
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}
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i++;
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}
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/*
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* If we can't find neither panel nor bridge on any of the
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* endpoints, and any of them retured -EPROBE_DEFER, then
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* let's defer this driver too.
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*/
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if ((!panel && !bridge) && defer)
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return -EPROBE_DEFER;
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if (panel) {
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bridge = drm_panel_bridge_add_typed(panel,
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DRM_MODE_CONNECTOR_Unknown);
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if (IS_ERR(bridge)) {
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ret = PTR_ERR(bridge);
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goto finish;
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}
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} else if (bridge) {
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dev_info(dev->dev, "Using non-panel bridge\n");
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} else {
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dev_err(dev->dev, "No bridge, exiting\n");
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return -ENODEV;
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}
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priv->bridge = bridge;
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if (panel) {
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priv->panel = panel;
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priv->connector = drm_panel_bridge_connector(bridge);
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}
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ret = pl111_display_init(dev);
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if (ret != 0) {
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dev_err(dev->dev, "Failed to init display\n");
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goto out_bridge;
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}
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ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
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bridge);
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if (ret)
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return ret;
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if (!priv->variant->broken_vblank) {
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ret = drm_vblank_init(dev, 1);
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if (ret != 0) {
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dev_err(dev->dev, "Failed to init vblank\n");
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goto out_bridge;
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}
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}
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drm_mode_config_reset(dev);
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drm_kms_helper_poll_init(dev);
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goto finish;
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out_bridge:
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if (panel)
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drm_panel_bridge_remove(bridge);
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finish:
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return ret;
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}
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static struct drm_gem_object *
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pl111_gem_import_sg_table(struct drm_device *dev,
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struct dma_buf_attachment *attach,
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struct sg_table *sgt)
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{
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struct pl111_drm_dev_private *priv = dev->dev_private;
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/*
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* When using device-specific reserved memory we can't import
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* DMA buffers: those are passed by reference in any global
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* memory and we can only handle a specific range of memory.
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*/
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if (priv->use_device_memory)
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return ERR_PTR(-EINVAL);
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return drm_gem_dma_prime_import_sg_table(dev, attach, sgt);
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}
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DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
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static const struct drm_driver pl111_drm_driver = {
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.driver_features =
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DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
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.ioctls = NULL,
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.fops = &drm_fops,
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.name = "pl111",
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.desc = DRIVER_DESC,
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.date = "20170317",
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.major = 1,
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.minor = 0,
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.patchlevel = 0,
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.dumb_create = drm_gem_dma_dumb_create,
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.gem_prime_import_sg_table = pl111_gem_import_sg_table,
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#if defined(CONFIG_DEBUG_FS)
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.debugfs_init = pl111_debugfs_init,
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#endif
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};
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static int pl111_amba_probe(struct amba_device *amba_dev,
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const struct amba_id *id)
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{
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struct device *dev = &amba_dev->dev;
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struct pl111_drm_dev_private *priv;
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const struct pl111_variant_data *variant = id->data;
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struct drm_device *drm;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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drm = drm_dev_alloc(&pl111_drm_driver, dev);
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if (IS_ERR(drm))
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return PTR_ERR(drm);
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amba_set_drvdata(amba_dev, drm);
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priv->drm = drm;
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drm->dev_private = priv;
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priv->variant = variant;
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ret = of_reserved_mem_device_init(dev);
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if (!ret) {
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dev_info(dev, "using device-specific reserved memory\n");
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priv->use_device_memory = true;
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}
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if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
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&priv->memory_bw)) {
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dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
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priv->memory_bw = 0;
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}
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/* The two main variants swap this register */
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if (variant->is_pl110 || variant->is_lcdc) {
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priv->ienb = CLCD_PL110_IENB;
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priv->ctrl = CLCD_PL110_CNTL;
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} else {
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priv->ienb = CLCD_PL111_IENB;
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priv->ctrl = CLCD_PL111_CNTL;
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}
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priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
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if (IS_ERR(priv->regs)) {
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dev_err(dev, "%s failed mmio\n", __func__);
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ret = PTR_ERR(priv->regs);
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goto dev_put;
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}
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/* This may override some variant settings */
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ret = pl111_versatile_init(dev, priv);
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if (ret)
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goto dev_put;
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pl111_nomadik_init(dev);
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/* turn off interrupts before requesting the irq */
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writel(0, priv->regs + priv->ienb);
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ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
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variant->name, priv);
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if (ret != 0) {
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dev_err(dev, "%s failed irq %d\n", __func__, ret);
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return ret;
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}
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ret = pl111_modeset_init(drm);
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if (ret != 0)
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goto dev_put;
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ret = drm_dev_register(drm, 0);
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if (ret < 0)
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goto dev_put;
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drm_fbdev_dma_setup(drm, priv->variant->fb_depth);
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return 0;
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dev_put:
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drm_dev_put(drm);
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of_reserved_mem_device_release(dev);
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return ret;
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}
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static void pl111_amba_remove(struct amba_device *amba_dev)
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{
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struct device *dev = &amba_dev->dev;
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struct drm_device *drm = amba_get_drvdata(amba_dev);
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struct pl111_drm_dev_private *priv = drm->dev_private;
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drm_dev_unregister(drm);
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drm_atomic_helper_shutdown(drm);
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if (priv->panel)
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drm_panel_bridge_remove(priv->bridge);
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drm_dev_put(drm);
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of_reserved_mem_device_release(dev);
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}
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static void pl111_amba_shutdown(struct amba_device *amba_dev)
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{
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drm_atomic_helper_shutdown(amba_get_drvdata(amba_dev));
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}
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/*
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* This early variant lacks the 565 and 444 pixel formats.
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*/
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static const u32 pl110_pixel_formats[] = {
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DRM_FORMAT_ABGR8888,
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DRM_FORMAT_XBGR8888,
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DRM_FORMAT_ARGB8888,
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DRM_FORMAT_XRGB8888,
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DRM_FORMAT_ABGR1555,
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DRM_FORMAT_XBGR1555,
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DRM_FORMAT_ARGB1555,
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DRM_FORMAT_XRGB1555,
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};
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static const struct pl111_variant_data pl110_variant = {
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.name = "PL110",
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.is_pl110 = true,
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.formats = pl110_pixel_formats,
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.nformats = ARRAY_SIZE(pl110_pixel_formats),
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.fb_depth = 16,
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};
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/* RealView, Versatile Express etc use this modern variant */
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static const u32 pl111_pixel_formats[] = {
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DRM_FORMAT_ABGR8888,
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DRM_FORMAT_XBGR8888,
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DRM_FORMAT_ARGB8888,
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DRM_FORMAT_XRGB8888,
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DRM_FORMAT_BGR565,
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DRM_FORMAT_RGB565,
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DRM_FORMAT_ABGR1555,
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DRM_FORMAT_XBGR1555,
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DRM_FORMAT_ARGB1555,
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DRM_FORMAT_XRGB1555,
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DRM_FORMAT_ABGR4444,
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DRM_FORMAT_XBGR4444,
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DRM_FORMAT_ARGB4444,
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DRM_FORMAT_XRGB4444,
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};
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static const struct pl111_variant_data pl111_variant = {
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.name = "PL111",
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.formats = pl111_pixel_formats,
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.nformats = ARRAY_SIZE(pl111_pixel_formats),
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.fb_depth = 32,
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};
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static const u32 pl110_nomadik_pixel_formats[] = {
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DRM_FORMAT_RGB888,
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DRM_FORMAT_BGR888,
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DRM_FORMAT_ABGR8888,
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DRM_FORMAT_XBGR8888,
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DRM_FORMAT_ARGB8888,
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DRM_FORMAT_XRGB8888,
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DRM_FORMAT_BGR565,
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DRM_FORMAT_RGB565,
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DRM_FORMAT_ABGR1555,
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DRM_FORMAT_XBGR1555,
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DRM_FORMAT_ARGB1555,
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DRM_FORMAT_XRGB1555,
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DRM_FORMAT_ABGR4444,
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DRM_FORMAT_XBGR4444,
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DRM_FORMAT_ARGB4444,
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DRM_FORMAT_XRGB4444,
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};
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static const struct pl111_variant_data pl110_nomadik_variant = {
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.name = "LCDC (PL110 Nomadik)",
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.formats = pl110_nomadik_pixel_formats,
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.nformats = ARRAY_SIZE(pl110_nomadik_pixel_formats),
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.is_lcdc = true,
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.st_bitmux_control = true,
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.broken_vblank = true,
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.fb_depth = 16,
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};
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static const struct amba_id pl111_id_table[] = {
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{
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.id = 0x00041110,
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.mask = 0x000fffff,
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.data = (void *)&pl110_variant,
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},
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{
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.id = 0x00180110,
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.mask = 0x00fffffe,
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.data = (void *)&pl110_nomadik_variant,
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},
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{
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.id = 0x00041111,
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.mask = 0x000fffff,
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.data = (void *)&pl111_variant,
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},
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{0, 0},
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};
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MODULE_DEVICE_TABLE(amba, pl111_id_table);
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static struct amba_driver pl111_amba_driver __maybe_unused = {
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.drv = {
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.name = "drm-clcd-pl111",
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},
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.probe = pl111_amba_probe,
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.remove = pl111_amba_remove,
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.shutdown = pl111_amba_shutdown,
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.id_table = pl111_id_table,
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};
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#ifdef CONFIG_ARM_AMBA
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module_amba_driver(pl111_amba_driver);
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#endif
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("ARM Ltd.");
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MODULE_LICENSE("GPL");
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