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1// SPDX-License-Identifier: GPL-2.0-only2/**************************************************************************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 struct21 */22 23static 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 46static const struct vm_operations_struct psb_fbdev_vm_ops = {47 .fault = psb_fbdev_vm_fault,48};49 50/*51 * struct fb_ops52 */53 54#define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)55 56static 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 96static 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 virtual105 * kernel remapping of the object. FIXME: Review if this is106 * suitable for our mmap work107 */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 115static 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 136static 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_funcs148 */149 150static 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 get175 * a console on full resolution. The X mode setting server will176 * 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 240err_drm_framebuffer_unregister_private:241 drm_framebuffer_unregister_private(fb);242 fb->obj[0] = NULL;243 drm_framebuffer_cleanup(fb);244 kfree(fb);245err_drm_gem_object_put:246 drm_gem_object_put(obj);247 return ret;248}249 250static 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 code256 */257 258static 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 271static int psb_fbdev_client_restore(struct drm_client_dev *client)272{273 drm_fb_helper_lastclose(client->dev);274 275 return 0;276}277 278static 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 300err_drm_fb_helper_fini:301 drm_fb_helper_fini(fb_helper);302err_drm_err:303 drm_err(dev, "Failed to setup gma500 fbdev emulation (ret=%d)\n", ret);304 return ret;305}306 307static 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 314void 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 335err_drm_fb_helper_unprepare:336 drm_fb_helper_unprepare(fb_helper);337 kfree(fb_helper);338}339