drivers/gpu/drm/sti/sti_drv.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2014
   3  * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
   4  * License terms:  GNU General Public License (GPL), version 2
   5  */
   6
   7 #include <drm/drmP.h>
   8
   9 #include <linux/component.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/of_platform.h>
  14
  15 #include <drm/drm_atomic.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_gem_cma_helper.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20
  21 #include "sti_crtc.h"
  22 #include "sti_drv.h"
  23
  24 #define DRIVER_NAME     "sti"
  25 #define DRIVER_DESC     "STMicroelectronics SoC DRM"
  26 #define DRIVER_DATE     "20140601"
  27 #define DRIVER_MAJOR    1
  28 #define DRIVER_MINOR    0
  29
  30 #define STI_MAX_FB_HEIGHT       4096
  31 #define STI_MAX_FB_WIDTH        4096
  32
  33 static void sti_atomic_schedule(struct sti_private *private,
  34                                 struct drm_atomic_state *state)
  35 {
  36         private->commit.state = state;
  37         schedule_work(&private->commit.work);
  38 }
  39
  40 static void sti_atomic_complete(struct sti_private *private,
  41                                 struct drm_atomic_state *state)
  42 {
  43         struct drm_device *drm = private->drm_dev;
  44
  45         /*
  46          * Everything below can be run asynchronously without the need to grab
  47          * any modeset locks at all under one condition: It must be guaranteed
  48          * that the asynchronous work has either been cancelled (if the driver
  49          * supports it, which at least requires that the framebuffers get
  50          * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
  51          * before the new state gets committed on the software side with
  52          * drm_atomic_helper_swap_state().
  53          *
  54          * This scheme allows new atomic state updates to be prepared and
  55          * checked in parallel to the asynchronous completion of the previous
  56          * update. Which is important since compositors need to figure out the
  57          * composition of the next frame right after having submitted the
  58          * current layout.
  59          */
  60
  61         drm_atomic_helper_commit_modeset_disables(drm, state);
  62         drm_atomic_helper_commit_planes(drm, state, false);
  63         drm_atomic_helper_commit_modeset_enables(drm, state);
  64
  65         drm_atomic_helper_wait_for_vblanks(drm, state);
  66
  67         drm_atomic_helper_cleanup_planes(drm, state);
  68         drm_atomic_state_free(state);
  69 }
  70
  71 static void sti_atomic_work(struct work_struct *work)
  72 {
  73         struct sti_private *private = container_of(work,
  74                         struct sti_private, commit.work);
  75
  76         sti_atomic_complete(private, private->commit.state);
  77 }
  78
  79 static int sti_atomic_commit(struct drm_device *drm,
  80                              struct drm_atomic_state *state, bool async)
  81 {
  82         struct sti_private *private = drm->dev_private;
  83         int err;
  84
  85         err = drm_atomic_helper_prepare_planes(drm, state);
  86         if (err)
  87                 return err;
  88
  89         /* serialize outstanding asynchronous commits */
  90         mutex_lock(&private->commit.lock);
  91         flush_work(&private->commit.work);
  92
  93         /*
  94          * This is the point of no return - everything below never fails except
  95          * when the hw goes bonghits. Which means we can commit the new state on
  96          * the software side now.
  97          */
  98
  99         drm_atomic_helper_swap_state(drm, state);
 100
 101         if (async)
 102                 sti_atomic_schedule(private, state);
 103         else
 104                 sti_atomic_complete(private, state);
 105
 106         mutex_unlock(&private->commit.lock);
 107         return 0;
 108 }
 109
 110 static struct drm_mode_config_funcs sti_mode_config_funcs = {
 111         .fb_create = drm_fb_cma_create,
 112         .atomic_check = drm_atomic_helper_check,
 113         .atomic_commit = sti_atomic_commit,
 114 };
 115
 116 static void sti_mode_config_init(struct drm_device *dev)
 117 {
 118         dev->mode_config.min_width = 0;
 119         dev->mode_config.min_height = 0;
 120
 121         /*
 122          * set max width and height as default value.
 123          * this value would be used to check framebuffer size limitation
 124          * at drm_mode_addfb().
 125          */
 126         dev->mode_config.max_width = STI_MAX_FB_HEIGHT;
 127         dev->mode_config.max_height = STI_MAX_FB_WIDTH;
 128
 129         dev->mode_config.funcs = &sti_mode_config_funcs;
 130 }
 131
 132 static int sti_load(struct drm_device *dev, unsigned long flags)
 133 {
 134         struct sti_private *private;
 135         int ret;
 136
 137         private = kzalloc(sizeof(*private), GFP_KERNEL);
 138         if (!private) {
 139                 DRM_ERROR("Failed to allocate private\n");
 140                 return -ENOMEM;
 141         }
 142         dev->dev_private = (void *)private;
 143         private->drm_dev = dev;
 144
 145         mutex_init(&private->commit.lock);
 146         INIT_WORK(&private->commit.work, sti_atomic_work);
 147
 148         drm_mode_config_init(dev);
 149         drm_kms_helper_poll_init(dev);
 150
 151         sti_mode_config_init(dev);
 152
 153         ret = component_bind_all(dev->dev, dev);
 154         if (ret) {
 155                 drm_kms_helper_poll_fini(dev);
 156                 drm_mode_config_cleanup(dev);
 157                 kfree(private);
 158                 return ret;
 159         }
 160
 161         drm_mode_config_reset(dev);
 162
 163 #ifdef CONFIG_DRM_STI_FBDEV
 164         drm_fbdev_cma_init(dev, 32,
 165                            dev->mode_config.num_crtc,
 166                            dev->mode_config.num_connector);
 167 #endif
 168         return 0;
 169 }
 170
 171 static const struct file_operations sti_driver_fops = {
 172         .owner = THIS_MODULE,
 173         .open = drm_open,
 174         .mmap = drm_gem_cma_mmap,
 175         .poll = drm_poll,
 176         .read = drm_read,
 177         .unlocked_ioctl = drm_ioctl,
 178 #ifdef CONFIG_COMPAT
 179         .compat_ioctl = drm_compat_ioctl,
 180 #endif
 181         .release = drm_release,
 182 };
 183
 184 static struct dma_buf *sti_gem_prime_export(struct drm_device *dev,
 185                                             struct drm_gem_object *obj,
 186                                             int flags)
 187 {
 188         /* we want to be able to write in mmapped buffer */
 189         flags |= O_RDWR;
 190         return drm_gem_prime_export(dev, obj, flags);
 191 }
 192
 193 static struct drm_driver sti_driver = {
 194         .driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
 195             DRIVER_GEM | DRIVER_PRIME,
 196         .load = sti_load,
 197         .gem_free_object = drm_gem_cma_free_object,
 198         .gem_vm_ops = &drm_gem_cma_vm_ops,
 199         .dumb_create = drm_gem_cma_dumb_create,
 200         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 201         .dumb_destroy = drm_gem_dumb_destroy,
 202         .fops = &sti_driver_fops,
 203
 204         .get_vblank_counter = drm_vblank_no_hw_counter,
 205         .enable_vblank = sti_crtc_enable_vblank,
 206         .disable_vblank = sti_crtc_disable_vblank,
 207
 208         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 209         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 210         .gem_prime_export = sti_gem_prime_export,
 211         .gem_prime_import = drm_gem_prime_import,
 212         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 213         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 214         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 215         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 216         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 217
 218         .name = DRIVER_NAME,
 219         .desc = DRIVER_DESC,
 220         .date = DRIVER_DATE,
 221         .major = DRIVER_MAJOR,
 222         .minor = DRIVER_MINOR,
 223 };
 224
 225 static int compare_of(struct device *dev, void *data)
 226 {
 227         return dev->of_node == data;
 228 }
 229
 230 static int sti_bind(struct device *dev)
 231 {
 232         return drm_platform_init(&sti_driver, to_platform_device(dev));
 233 }
 234
 235 static void sti_unbind(struct device *dev)
 236 {
 237         drm_put_dev(dev_get_drvdata(dev));
 238 }
 239
 240 static const struct component_master_ops sti_ops = {
 241         .bind = sti_bind,
 242         .unbind = sti_unbind,
 243 };
 244
 245 static int sti_platform_probe(struct platform_device *pdev)
 246 {
 247         struct device *dev = &pdev->dev;
 248         struct device_node *node = dev->of_node;
 249         struct device_node *child_np;
 250         struct component_match *match = NULL;
 251
 252         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 253
 254         of_platform_populate(node, NULL, NULL, dev);
 255
 256         child_np = of_get_next_available_child(node, NULL);
 257
 258         while (child_np) {
 259                 component_match_add(dev, &match, compare_of, child_np);
 260                 of_node_put(child_np);
 261                 child_np = of_get_next_available_child(node, child_np);
 262         }
 263
 264         return component_master_add_with_match(dev, &sti_ops, match);
 265 }
 266
 267 static int sti_platform_remove(struct platform_device *pdev)
 268 {
 269         component_master_del(&pdev->dev, &sti_ops);
 270         of_platform_depopulate(&pdev->dev);
 271
 272         return 0;
 273 }
 274
 275 static const struct of_device_id sti_dt_ids[] = {
 276         { .compatible = "st,sti-display-subsystem", },
 277         { /* end node */ },
 278 };
 279 MODULE_DEVICE_TABLE(of, sti_dt_ids);
 280
 281 static struct platform_driver sti_platform_driver = {
 282         .probe = sti_platform_probe,
 283         .remove = sti_platform_remove,
 284         .driver = {
 285                 .name = DRIVER_NAME,
 286                 .of_match_table = sti_dt_ids,
 287         },
 288 };
 289
 290 module_platform_driver(sti_platform_driver);
 291
 292 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 293 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 294 MODULE_LICENSE("GPL");