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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/4 * Author: Rob Clark <rob@ti.com>5 */6 7#include <linux/fb.h>8 9#include <drm/drm_drv.h>10#include <drm/drm_crtc_helper.h>11#include <drm/drm_fb_helper.h>12#include <drm/drm_file.h>13#include <drm/drm_fourcc.h>14#include <drm/drm_framebuffer.h>15#include <drm/drm_gem_framebuffer_helper.h>16#include <drm/drm_util.h>17 18#include "omap_drv.h"19#include "omap_fbdev.h"20 21MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");22static bool ywrap_enabled = true;23module_param_named(ywrap, ywrap_enabled, bool, 0644);24 25/*26 * fbdev funcs, to implement legacy fbdev interface on top of drm driver27 */28 29#define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)30 31struct omap_fbdev {32 struct drm_fb_helper base;33 bool ywrap_enabled;34 35 /* for deferred dmm roll when getting called in atomic ctx */36 struct work_struct work;37};38 39static struct drm_fb_helper *get_fb(struct fb_info *fbi);40 41static void pan_worker(struct work_struct *work)42{43 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);44 struct drm_fb_helper *helper = &fbdev->base;45 struct fb_info *fbi = helper->info;46 struct drm_gem_object *bo = drm_gem_fb_get_obj(helper->fb, 0);47 int npages;48 49 /* DMM roll shifts in 4K pages: */50 npages = fbi->fix.line_length >> PAGE_SHIFT;51 omap_gem_roll(bo, fbi->var.yoffset * npages);52}53 54FB_GEN_DEFAULT_DEFERRED_DMAMEM_OPS(omap_fbdev,55 drm_fb_helper_damage_range,56 drm_fb_helper_damage_area)57 58static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,59 struct fb_info *fbi)60{61 struct drm_fb_helper *helper = get_fb(fbi);62 struct omap_fbdev *fbdev = to_omap_fbdev(helper);63 64 if (!helper)65 goto fallback;66 67 if (!fbdev->ywrap_enabled)68 goto fallback;69 70 if (drm_can_sleep()) {71 pan_worker(&fbdev->work);72 } else {73 struct omap_drm_private *priv = helper->dev->dev_private;74 queue_work(priv->wq, &fbdev->work);75 }76 77 return 0;78 79fallback:80 return drm_fb_helper_pan_display(var, fbi);81}82 83static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)84{85 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));86 87 return fb_deferred_io_mmap(info, vma);88}89 90static void omap_fbdev_fb_destroy(struct fb_info *info)91{92 struct drm_fb_helper *helper = info->par;93 struct drm_framebuffer *fb = helper->fb;94 struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0);95 struct omap_fbdev *fbdev = to_omap_fbdev(helper);96 97 DBG();98 99 fb_deferred_io_cleanup(info);100 drm_fb_helper_fini(helper);101 102 omap_gem_unpin(bo);103 drm_framebuffer_remove(fb);104 105 drm_client_release(&helper->client);106 drm_fb_helper_unprepare(helper);107 kfree(fbdev);108}109 110/*111 * For now, we cannot use FB_DEFAULT_DEFERRED_OPS and fb_deferred_io_mmap()112 * because we use write-combine.113 */114static const struct fb_ops omap_fb_ops = {115 .owner = THIS_MODULE,116 __FB_DEFAULT_DEFERRED_OPS_RDWR(omap_fbdev),117 .fb_check_var = drm_fb_helper_check_var,118 .fb_set_par = drm_fb_helper_set_par,119 .fb_setcmap = drm_fb_helper_setcmap,120 .fb_blank = drm_fb_helper_blank,121 .fb_pan_display = omap_fbdev_pan_display,122 __FB_DEFAULT_DEFERRED_OPS_DRAW(omap_fbdev),123 .fb_ioctl = drm_fb_helper_ioctl,124 .fb_mmap = omap_fbdev_fb_mmap,125 .fb_destroy = omap_fbdev_fb_destroy,126};127 128static int omap_fbdev_create(struct drm_fb_helper *helper,129 struct drm_fb_helper_surface_size *sizes)130{131 struct omap_fbdev *fbdev = to_omap_fbdev(helper);132 struct drm_device *dev = helper->dev;133 struct omap_drm_private *priv = dev->dev_private;134 struct drm_framebuffer *fb = NULL;135 union omap_gem_size gsize;136 struct fb_info *fbi = NULL;137 struct drm_mode_fb_cmd2 mode_cmd = {0};138 struct drm_gem_object *bo;139 dma_addr_t dma_addr;140 int ret;141 142 sizes->surface_bpp = 32;143 sizes->surface_depth = 24;144 145 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,146 sizes->surface_height, sizes->surface_bpp,147 sizes->fb_width, sizes->fb_height);148 149 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,150 sizes->surface_depth);151 152 mode_cmd.width = sizes->surface_width;153 mode_cmd.height = sizes->surface_height;154 155 mode_cmd.pitches[0] =156 DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);157 158 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;159 if (fbdev->ywrap_enabled) {160 /* need to align pitch to page size if using DMM scrolling */161 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);162 }163 164 /* allocate backing bo */165 gsize = (union omap_gem_size){166 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),167 };168 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);169 bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);170 if (!bo) {171 dev_err(dev->dev, "failed to allocate buffer object\n");172 ret = -ENOMEM;173 goto fail;174 }175 176 fb = omap_framebuffer_init(dev, &mode_cmd, &bo);177 if (IS_ERR(fb)) {178 dev_err(dev->dev, "failed to allocate fb\n");179 /* note: if fb creation failed, we can't rely on fb destroy180 * to unref the bo:181 */182 drm_gem_object_put(bo);183 ret = PTR_ERR(fb);184 goto fail;185 }186 187 /* note: this keeps the bo pinned.. which is perhaps not ideal,188 * but is needed as long as we use fb_mmap() to mmap to userspace189 * (since this happens using fix.smem_start). Possibly we could190 * implement our own mmap using GEM mmap support to avoid this191 * (non-tiled buffer doesn't need to be pinned for fbcon to write192 * to it). Then we just need to be sure that we are able to re-193 * pin it in case of an opps.194 */195 ret = omap_gem_pin(bo, &dma_addr);196 if (ret) {197 dev_err(dev->dev, "could not pin framebuffer\n");198 ret = -ENOMEM;199 goto fail;200 }201 202 fbi = drm_fb_helper_alloc_info(helper);203 if (IS_ERR(fbi)) {204 dev_err(dev->dev, "failed to allocate fb info\n");205 ret = PTR_ERR(fbi);206 goto fail;207 }208 209 DBG("fbi=%p, dev=%p", fbi, dev);210 211 helper->fb = fb;212 213 fbi->fbops = &omap_fb_ops;214 215 drm_fb_helper_fill_info(fbi, helper, sizes);216 217 fbi->flags |= FBINFO_VIRTFB;218 fbi->screen_buffer = omap_gem_vaddr(bo);219 fbi->screen_size = bo->size;220 fbi->fix.smem_start = dma_addr;221 fbi->fix.smem_len = bo->size;222 223 /* deferred I/O */224 helper->fbdefio.delay = HZ / 20;225 helper->fbdefio.deferred_io = drm_fb_helper_deferred_io;226 227 fbi->fbdefio = &helper->fbdefio;228 ret = fb_deferred_io_init(fbi);229 if (ret)230 goto fail;231 232 /* if we have DMM, then we can use it for scrolling by just233 * shuffling pages around in DMM rather than doing sw blit.234 */235 if (fbdev->ywrap_enabled) {236 DRM_INFO("Enabling DMM ywrap scrolling\n");237 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;238 fbi->fix.ywrapstep = 1;239 }240 241 242 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);243 DBG("allocated %dx%d fb", fb->width, fb->height);244 245 return 0;246 247fail:248 249 if (ret) {250 if (fb)251 drm_framebuffer_remove(fb);252 }253 254 return ret;255}256 257static int omap_fbdev_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)258{259 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))260 return 0;261 262 if (helper->fb->funcs->dirty)263 return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);264 265 return 0;266}267 268static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {269 .fb_probe = omap_fbdev_create,270 .fb_dirty = omap_fbdev_dirty,271};272 273static struct drm_fb_helper *get_fb(struct fb_info *fbi)274{275 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {276 /* these are not the fb's you're looking for */277 return NULL;278 }279 return fbi->par;280}281 282/*283 * struct drm_client284 */285 286static void omap_fbdev_client_unregister(struct drm_client_dev *client)287{288 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);289 290 if (fb_helper->info) {291 drm_fb_helper_unregister_info(fb_helper);292 } else {293 drm_client_release(&fb_helper->client);294 drm_fb_helper_unprepare(fb_helper);295 kfree(fb_helper);296 }297}298 299static int omap_fbdev_client_restore(struct drm_client_dev *client)300{301 drm_fb_helper_lastclose(client->dev);302 303 return 0;304}305 306static int omap_fbdev_client_hotplug(struct drm_client_dev *client)307{308 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);309 struct drm_device *dev = client->dev;310 int ret;311 312 if (dev->fb_helper)313 return drm_fb_helper_hotplug_event(dev->fb_helper);314 315 ret = drm_fb_helper_init(dev, fb_helper);316 if (ret)317 goto err_drm_err;318 319 ret = drm_fb_helper_initial_config(fb_helper);320 if (ret)321 goto err_drm_fb_helper_fini;322 323 return 0;324 325err_drm_fb_helper_fini:326 drm_fb_helper_fini(fb_helper);327err_drm_err:328 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);329 return ret;330}331 332static const struct drm_client_funcs omap_fbdev_client_funcs = {333 .owner = THIS_MODULE,334 .unregister = omap_fbdev_client_unregister,335 .restore = omap_fbdev_client_restore,336 .hotplug = omap_fbdev_client_hotplug,337};338 339void omap_fbdev_setup(struct drm_device *dev)340{341 struct omap_fbdev *fbdev;342 struct drm_fb_helper *helper;343 int ret;344 345 drm_WARN(dev, !dev->registered, "Device has not been registered.\n");346 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");347 348 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);349 if (!fbdev)350 return;351 helper = &fbdev->base;352 353 drm_fb_helper_prepare(dev, helper, 32, &omap_fb_helper_funcs);354 355 ret = drm_client_init(dev, &helper->client, "fbdev", &omap_fbdev_client_funcs);356 if (ret)357 goto err_drm_client_init;358 359 INIT_WORK(&fbdev->work, pan_worker);360 361 drm_client_register(&helper->client);362 363 return;364 365err_drm_client_init:366 drm_fb_helper_unprepare(helper);367 kfree(fbdev);368}369