drivers/gpu/drm/gma500/fbdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /**************************************************************************
   3  * Copyright (c) 2007-2011, Intel Corporation.
   4  * All Rights Reserved.
   5  *
   6  **************************************************************************/
   7
   8 #include <linux/fb.h>
   9 #include <linux/pfn_t.h>
  10
  11 #include <drm/drm_crtc_helper.h>
  12 #include <drm/drm_drv.h>
  13 #include <drm/drm_fb_helper.h>
  14 #include <drm/drm_framebuffer.h>
  15
  16 #include "gem.h"
  17 #include "psb_drv.h"
  18
  19 /*
  20  * VM area struct
  21  */
  22
  23 static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
  24 {
  25         struct vm_area_struct *vma = vmf->vma;
  26         struct fb_info *info = vma->vm_private_data;
  27         unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
  28         unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT;
  29         vm_fault_t err = VM_FAULT_SIGBUS;
  30         unsigned long page_num = vma_pages(vma);
  31         unsigned long i;
  32
  33         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
  34
  35         for (i = 0; i < page_num; ++i) {
  36                 err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, PFN_DEV));
  37                 if (unlikely(err & VM_FAULT_ERROR))
  38                         break;
  39                 address += PAGE_SIZE;
  40                 ++pfn;
  41         }
  42
  43         return err;
  44 }
  45
  46 static const struct vm_operations_struct psb_fbdev_vm_ops = {
  47         .fault  = psb_fbdev_vm_fault,
  48 };
  49
  50 /*
  51  * struct fb_ops
  52  */
  53
  54 #define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
  55
  56 static int psb_fbdev_fb_setcolreg(unsigned int regno,
  57                                   unsigned int red, unsigned int green,
  58                                   unsigned int blue, unsigned int transp,
  59                                   struct fb_info *info)
  60 {
  61         struct drm_fb_helper *fb_helper = info->par;
  62         struct drm_framebuffer *fb = fb_helper->fb;
  63         uint32_t v;
  64
  65         if (!fb)
  66                 return -ENOMEM;
  67
  68         if (regno > 255)
  69                 return 1;
  70
  71         red = CMAP_TOHW(red, info->var.red.length);
  72         blue = CMAP_TOHW(blue, info->var.blue.length);
  73         green = CMAP_TOHW(green, info->var.green.length);
  74         transp = CMAP_TOHW(transp, info->var.transp.length);
  75
  76         v = (red << info->var.red.offset) |
  77             (green << info->var.green.offset) |
  78             (blue << info->var.blue.offset) |
  79             (transp << info->var.transp.offset);
  80
  81         if (regno < 16) {
  82                 switch (fb->format->cpp[0] * 8) {
  83                 case 16:
  84                         ((uint32_t *) info->pseudo_palette)[regno] = v;
  85                         break;
  86                 case 24:
  87                 case 32:
  88                         ((uint32_t *) info->pseudo_palette)[regno] = v;
  89                         break;
  90                 }
  91         }
  92
  93         return 0;
  94 }
  95
  96 static int psb_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
  97 {
  98         if (vma->vm_pgoff != 0)
  99                 return -EINVAL;
 100         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 101                 return -EINVAL;
 102
 103         /*
 104          * If this is a GEM object then info->screen_base is the virtual
 105          * kernel remapping of the object. FIXME: Review if this is
 106          * suitable for our mmap work
 107          */
 108         vma->vm_ops = &psb_fbdev_vm_ops;
 109         vma->vm_private_data = info;
 110         vm_flags_set(vma, VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP);
 111
 112         return 0;
 113 }
 114
 115 static void psb_fbdev_fb_destroy(struct fb_info *info)
 116 {
 117         struct drm_fb_helper *fb_helper = info->par;
 118         struct drm_framebuffer *fb = fb_helper->fb;
 119         struct drm_gem_object *obj = fb->obj[0];
 120
 121         drm_fb_helper_fini(fb_helper);
 122
 123         drm_framebuffer_unregister_private(fb);
 124         fb->obj[0] = NULL;
 125         drm_framebuffer_cleanup(fb);
 126         kfree(fb);
 127
 128         drm_gem_object_put(obj);
 129
 130         drm_client_release(&fb_helper->client);
 131
 132         drm_fb_helper_unprepare(fb_helper);
 133         kfree(fb_helper);
 134 }
 135
 136 static const struct fb_ops psb_fbdev_fb_ops = {
 137         .owner = THIS_MODULE,
 138         __FB_DEFAULT_IOMEM_OPS_RDWR,
 139         DRM_FB_HELPER_DEFAULT_OPS,
 140         .fb_setcolreg = psb_fbdev_fb_setcolreg,
 141         __FB_DEFAULT_IOMEM_OPS_DRAW,
 142         .fb_mmap = psb_fbdev_fb_mmap,
 143         .fb_destroy = psb_fbdev_fb_destroy,
 144 };
 145
 146 /*
 147  * struct drm_fb_helper_funcs
 148  */
 149
 150 static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
 151                               struct drm_fb_helper_surface_size *sizes)
 152 {
 153         struct drm_device *dev = fb_helper->dev;
 154         struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 155         struct pci_dev *pdev = to_pci_dev(dev->dev);
 156         struct fb_info *info;
 157         struct drm_framebuffer *fb;
 158         struct drm_mode_fb_cmd2 mode_cmd = { };
 159         int size;
 160         int ret;
 161         struct psb_gem_object *backing;
 162         struct drm_gem_object *obj;
 163         u32 bpp, depth;
 164
 165         /* No 24-bit packed mode */
 166         if (sizes->surface_bpp == 24) {
 167                 sizes->surface_bpp = 32;
 168                 sizes->surface_depth = 24;
 169         }
 170         bpp = sizes->surface_bpp;
 171         depth = sizes->surface_depth;
 172
 173         /*
 174          * If the mode does not fit in 32 bit then switch to 16 bit to get
 175          * a console on full resolution. The X mode setting server will
 176          * allocate its own 32-bit GEM framebuffer.
 177          */
 178         size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) *
 179                      sizes->surface_height;
 180         size = ALIGN(size, PAGE_SIZE);
 181
 182         if (size > dev_priv->vram_stolen_size) {
 183                 sizes->surface_bpp = 16;
 184                 sizes->surface_depth = 16;
 185         }
 186         bpp = sizes->surface_bpp;
 187         depth = sizes->surface_depth;
 188
 189         mode_cmd.width = sizes->surface_width;
 190         mode_cmd.height = sizes->surface_height;
 191         mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
 192         mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
 193
 194         size = mode_cmd.pitches[0] * mode_cmd.height;
 195         size = ALIGN(size, PAGE_SIZE);
 196
 197         /* Allocate the framebuffer in the GTT with stolen page backing */
 198         backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
 199         if (IS_ERR(backing))
 200                 return PTR_ERR(backing);
 201         obj = &backing->base;
 202
 203         fb = psb_framebuffer_create(dev, &mode_cmd, obj);
 204         if (IS_ERR(fb)) {
 205                 ret = PTR_ERR(fb);
 206                 goto err_drm_gem_object_put;
 207         }
 208
 209         fb_helper->fb = fb;
 210
 211         info = drm_fb_helper_alloc_info(fb_helper);
 212         if (IS_ERR(info)) {
 213                 ret = PTR_ERR(info);
 214                 goto err_drm_framebuffer_unregister_private;
 215         }
 216
 217         info->fbops = &psb_fbdev_fb_ops;
 218
 219         /* Accessed stolen memory directly */
 220         info->screen_base = dev_priv->vram_addr + backing->offset;
 221         info->screen_size = size;
 222
 223         drm_fb_helper_fill_info(info, fb_helper, sizes);
 224
 225         info->fix.smem_start = dev_priv->stolen_base + backing->offset;
 226         info->fix.smem_len = size;
 227         info->fix.ywrapstep = 0;
 228         info->fix.ypanstep = 0;
 229         info->fix.mmio_start = pci_resource_start(pdev, 0);
 230         info->fix.mmio_len = pci_resource_len(pdev, 0);
 231
 232         fb_memset_io(info->screen_base, 0, info->screen_size);
 233
 234         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 235
 236         dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
 237
 238         return 0;
 239
 240 err_drm_framebuffer_unregister_private:
 241         drm_framebuffer_unregister_private(fb);
 242         fb->obj[0] = NULL;
 243         drm_framebuffer_cleanup(fb);
 244         kfree(fb);
 245 err_drm_gem_object_put:
 246         drm_gem_object_put(obj);
 247         return ret;
 248 }
 249
 250 static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
 251         .fb_probe = psb_fbdev_fb_probe,
 252 };
 253
 254 /*
 255  * struct drm_client_funcs and setup code
 256  */
 257
 258 static void psb_fbdev_client_unregister(struct drm_client_dev *client)
 259 {
 260         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 261
 262         if (fb_helper->info) {
 263                 drm_fb_helper_unregister_info(fb_helper);
 264         } else {
 265                 drm_fb_helper_unprepare(fb_helper);
 266                 drm_client_release(&fb_helper->client);
 267                 kfree(fb_helper);
 268         }
 269 }
 270
 271 static int psb_fbdev_client_restore(struct drm_client_dev *client)
 272 {
 273         drm_fb_helper_lastclose(client->dev);
 274
 275         return 0;
 276 }
 277
 278 static int psb_fbdev_client_hotplug(struct drm_client_dev *client)
 279 {
 280         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 281         struct drm_device *dev = client->dev;
 282         int ret;
 283
 284         if (dev->fb_helper)
 285                 return drm_fb_helper_hotplug_event(dev->fb_helper);
 286
 287         ret = drm_fb_helper_init(dev, fb_helper);
 288         if (ret)
 289                 goto err_drm_err;
 290
 291         if (!drm_drv_uses_atomic_modeset(dev))
 292                 drm_helper_disable_unused_functions(dev);
 293
 294         ret = drm_fb_helper_initial_config(fb_helper);
 295         if (ret)
 296                 goto err_drm_fb_helper_fini;
 297
 298         return 0;
 299
 300 err_drm_fb_helper_fini:
 301         drm_fb_helper_fini(fb_helper);
 302 err_drm_err:
 303         drm_err(dev, "Failed to setup gma500 fbdev emulation (ret=%d)\n", ret);
 304         return ret;
 305 }
 306
 307 static const struct drm_client_funcs psb_fbdev_client_funcs = {
 308         .owner          = THIS_MODULE,
 309         .unregister     = psb_fbdev_client_unregister,
 310         .restore        = psb_fbdev_client_restore,
 311         .hotplug        = psb_fbdev_client_hotplug,
 312 };
 313
 314 void psb_fbdev_setup(struct drm_psb_private *dev_priv)
 315 {
 316         struct drm_device *dev = &dev_priv->dev;
 317         struct drm_fb_helper *fb_helper;
 318         int ret;
 319
 320         fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
 321         if (!fb_helper)
 322                 return;
 323         drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fbdev_fb_helper_funcs);
 324
 325         ret = drm_client_init(dev, &fb_helper->client, "fbdev-gma500", &psb_fbdev_client_funcs);
 326         if (ret) {
 327                 drm_err(dev, "Failed to register client: %d\n", ret);
 328                 goto err_drm_fb_helper_unprepare;
 329         }
 330
 331         drm_client_register(&fb_helper->client);
 332
 333         return;
 334
 335 err_drm_fb_helper_unprepare:
 336         drm_fb_helper_unprepare(fb_helper);
 337         kfree(fb_helper);
 338 }