2 * (C) COPYRIGHT 2012-2013 ARM Limited. All rights reserved.
4 * Parts of this file were based on sources as follows:
6 * Copyright (c) 2006-2008 Intel Corporation
8 * Copyright (C) 2011 Texas Instruments
10 * This program is free software and is provided to you under the terms of the
11 * GNU General Public License version 2 as published by the Free Software
12 * Foundation, and any use by you of this program is subject to the terms of
18 * DOC: ARM PrimeCell PL111 CLCD Driver
20 * The PL111 is a simple LCD controller that can support TFT and STN
21 * displays. This driver exposes a standard KMS interface for them.
23 * This driver uses the same Device Tree binding as the fbdev CLCD
24 * driver. While the fbdev driver supports panels that may be
25 * connected to the CLCD internally to the CLCD driver, in DRM the
26 * panels get split out to drivers/gpu/drm/panels/. This means that,
27 * in converting from using fbdev to using DRM, you also need to write
28 * a panel driver (which may be as simple as an entry in
31 * The driver currently doesn't expose the cursor. The DRM API for
32 * cursors requires support for 64x64 ARGB8888 cursor images, while
33 * the hardware can only support 64x64 monochrome with masking
34 * cursors. While one could imagine trying to hack something together
35 * to look at the ARGB8888 and program reasonable in monochrome, we
36 * just don't expose the cursor at all instead, and leave cursor
37 * support to the X11 software cursor layer.
41 * - Fix race between setting plane base address and getting IRQ for
42 * vsync firing the pageflip completion.
44 * - Use the "max-memory-bandwidth" DT property to filter the
47 * - Read back hardware state at boot to skip reprogramming the
48 * hardware when doing a no-op modeset.
50 * - Use the CLKSEL bit to support switching between the two external
54 #include <linux/amba/bus.h>
55 #include <linux/amba/clcd-regs.h>
56 #include <linux/version.h>
57 #include <linux/shmem_fs.h>
58 #include <linux/dma-buf.h>
59 #include <linux/module.h>
60 #include <linux/slab.h>
63 #include <drm/drm_atomic_helper.h>
64 #include <drm/drm_crtc_helper.h>
65 #include <drm/drm_gem_cma_helper.h>
66 #include <drm/drm_gem_framebuffer_helper.h>
67 #include <drm/drm_fb_cma_helper.h>
68 #include <drm/drm_of.h>
69 #include <drm/drm_bridge.h>
70 #include <drm/drm_panel.h>
72 #include "pl111_drm.h"
73 #include "pl111_versatile.h"
75 #define DRIVER_DESC "DRM module for PL111"
77 static const struct drm_mode_config_funcs mode_config_funcs = {
78 .fb_create = drm_gem_fb_create,
79 .atomic_check = drm_atomic_helper_check,
80 .atomic_commit = drm_atomic_helper_commit,
83 static int pl111_modeset_init(struct drm_device *dev)
85 struct drm_mode_config *mode_config;
86 struct pl111_drm_dev_private *priv = dev->dev_private;
87 struct drm_panel *panel;
88 struct drm_bridge *bridge;
91 drm_mode_config_init(dev);
92 mode_config = &dev->mode_config;
93 mode_config->funcs = &mode_config_funcs;
94 mode_config->min_width = 1;
95 mode_config->max_width = 1024;
96 mode_config->min_height = 1;
97 mode_config->max_height = 768;
99 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
100 0, 0, &panel, &bridge);
101 if (ret && ret != -ENODEV)
104 bridge = drm_panel_bridge_add(panel,
105 DRM_MODE_CONNECTOR_Unknown);
106 if (IS_ERR(bridge)) {
107 ret = PTR_ERR(bridge);
111 * TODO: when we are using a different bridge than a panel
112 * (such as a dumb VGA connector) we need to devise a different
113 * method to get the connector out of the bridge.
117 ret = pl111_display_init(dev);
119 dev_err(dev->dev, "Failed to init display\n");
123 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
128 priv->bridge = bridge;
130 priv->connector = panel->connector;
132 ret = drm_vblank_init(dev, 1);
134 dev_err(dev->dev, "Failed to init vblank\n");
138 drm_mode_config_reset(dev);
140 priv->fbdev = drm_fbdev_cma_init(dev, 32,
141 dev->mode_config.num_connector);
143 drm_kms_helper_poll_init(dev);
149 drm_panel_bridge_remove(bridge);
151 drm_mode_config_cleanup(dev);
156 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
158 static void pl111_lastclose(struct drm_device *dev)
160 struct pl111_drm_dev_private *priv = dev->dev_private;
162 drm_fbdev_cma_restore_mode(priv->fbdev);
165 static struct drm_driver pl111_drm_driver = {
167 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
168 .lastclose = pl111_lastclose,
177 .dumb_create = drm_gem_cma_dumb_create,
178 .gem_free_object_unlocked = drm_gem_cma_free_object,
179 .gem_vm_ops = &drm_gem_cma_vm_ops,
181 .enable_vblank = pl111_enable_vblank,
182 .disable_vblank = pl111_disable_vblank,
184 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
185 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
186 .gem_prime_import = drm_gem_prime_import,
187 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
188 .gem_prime_export = drm_gem_prime_export,
189 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
191 #if defined(CONFIG_DEBUG_FS)
192 .debugfs_init = pl111_debugfs_init,
196 static int pl111_amba_probe(struct amba_device *amba_dev,
197 const struct amba_id *id)
199 struct device *dev = &amba_dev->dev;
200 struct pl111_drm_dev_private *priv;
201 struct pl111_variant_data *variant = id->data;
202 struct drm_device *drm;
205 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
209 drm = drm_dev_alloc(&pl111_drm_driver, dev);
212 amba_set_drvdata(amba_dev, drm);
214 drm->dev_private = priv;
215 priv->variant = variant;
218 * The PL110 and PL111 variants have two registers
219 * swapped: interrupt enable and control. For this reason
220 * we use offsets that we can change per variant.
222 if (variant->is_pl110) {
224 * The ARM Versatile boards are even more special:
225 * their PrimeCell ID say they are PL110 but the
226 * control and interrupt enable registers are anyway
227 * swapped to the PL111 order so they are not following
228 * the PL110 datasheet.
230 if (of_machine_is_compatible("arm,versatile-ab") ||
231 of_machine_is_compatible("arm,versatile-pb")) {
232 priv->ienb = CLCD_PL111_IENB;
233 priv->ctrl = CLCD_PL111_CNTL;
235 priv->ienb = CLCD_PL110_IENB;
236 priv->ctrl = CLCD_PL110_CNTL;
239 priv->ienb = CLCD_PL111_IENB;
240 priv->ctrl = CLCD_PL111_CNTL;
243 priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
244 if (IS_ERR(priv->regs)) {
245 dev_err(dev, "%s failed mmio\n", __func__);
246 return PTR_ERR(priv->regs);
249 /* turn off interrupts before requesting the irq */
250 writel(0, priv->regs + priv->ienb);
252 ret = devm_request_irq(dev, amba_dev->irq[0], pl111_irq, 0,
253 variant->name, priv);
255 dev_err(dev, "%s failed irq %d\n", __func__, ret);
259 ret = pl111_versatile_init(dev, priv);
263 ret = pl111_modeset_init(drm);
267 ret = drm_dev_register(drm, 0);
278 static int pl111_amba_remove(struct amba_device *amba_dev)
280 struct drm_device *drm = amba_get_drvdata(amba_dev);
281 struct pl111_drm_dev_private *priv = drm->dev_private;
283 drm_dev_unregister(drm);
285 drm_fbdev_cma_fini(priv->fbdev);
287 drm_panel_bridge_remove(priv->bridge);
288 drm_mode_config_cleanup(drm);
295 * This variant exist in early versions like the ARM Integrator
296 * and this version lacks the 565 and 444 pixel formats.
298 static const u32 pl110_pixel_formats[] = {
309 static const struct pl111_variant_data pl110_variant = {
312 .formats = pl110_pixel_formats,
313 .nformats = ARRAY_SIZE(pl110_pixel_formats),
316 /* RealView, Versatile Express etc use this modern variant */
317 static const u32 pl111_pixel_formats[] = {
334 static const struct pl111_variant_data pl111_variant = {
336 .formats = pl111_pixel_formats,
337 .nformats = ARRAY_SIZE(pl111_pixel_formats),
340 static const struct amba_id pl111_id_table[] = {
344 .data = (void*)&pl110_variant,
349 .data = (void*)&pl111_variant,
354 static struct amba_driver pl111_amba_driver __maybe_unused = {
356 .name = "drm-clcd-pl111",
358 .probe = pl111_amba_probe,
359 .remove = pl111_amba_remove,
360 .id_table = pl111_id_table,
363 #ifdef CONFIG_ARM_AMBA
364 module_amba_driver(pl111_amba_driver);
367 MODULE_DESCRIPTION(DRIVER_DESC);
368 MODULE_AUTHOR("ARM Ltd.");
369 MODULE_LICENSE("GPL");