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_IO_OPS_RDWR, 139 DRM_FB_HELPER_DEFAULT_OPS, 140 .fb_setcolreg = psb_fbdev_fb_setcolreg, 141 __FB_DEFAULT_IO_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 info->flags = FBINFO_DEFAULT; 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 } 339