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 10 #include <drm/drm_crtc_helper.h> 11 #include <drm/drm_drv.h> 12 #include <drm/drm_fb_helper.h> 13 #include <drm/drm_framebuffer.h> 14 15 #include "gem.h" 16 #include "psb_drv.h" 17 18 /* 19 * VM area struct 20 */ 21 22 static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf) 23 { 24 struct vm_area_struct *vma = vmf->vma; 25 struct fb_info *info = vma->vm_private_data; 26 unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT); 27 unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT; 28 vm_fault_t err = VM_FAULT_SIGBUS; 29 unsigned long page_num = vma_pages(vma); 30 unsigned long i; 31 32 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 33 34 for (i = 0; i < page_num; ++i) { 35 err = vmf_insert_mixed(vma, address, pfn); 36 if (unlikely(err & VM_FAULT_ERROR)) 37 break; 38 address += PAGE_SIZE; 39 ++pfn; 40 } 41 42 return err; 43 } 44 45 static const struct vm_operations_struct psb_fbdev_vm_ops = { 46 .fault = psb_fbdev_vm_fault, 47 }; 48 49 /* 50 * struct fb_ops 51 */ 52 53 #define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16) 54 55 static int psb_fbdev_fb_setcolreg(unsigned int regno, 56 unsigned int red, unsigned int green, 57 unsigned int blue, unsigned int transp, 58 struct fb_info *info) 59 { 60 struct drm_fb_helper *fb_helper = info->par; 61 struct drm_framebuffer *fb = fb_helper->fb; 62 uint32_t v; 63 64 if (!fb) 65 return -ENOMEM; 66 67 if (regno > 255) 68 return 1; 69 70 red = CMAP_TOHW(red, info->var.red.length); 71 blue = CMAP_TOHW(blue, info->var.blue.length); 72 green = CMAP_TOHW(green, info->var.green.length); 73 transp = CMAP_TOHW(transp, info->var.transp.length); 74 75 v = (red << info->var.red.offset) | 76 (green << info->var.green.offset) | 77 (blue << info->var.blue.offset) | 78 (transp << info->var.transp.offset); 79 80 if (regno < 16) { 81 switch (fb->format->cpp[0] * 8) { 82 case 16: 83 ((uint32_t *) info->pseudo_palette)[regno] = v; 84 break; 85 case 24: 86 case 32: 87 ((uint32_t *) info->pseudo_palette)[regno] = v; 88 break; 89 } 90 } 91 92 return 0; 93 } 94 95 static int psb_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 96 { 97 if (vma->vm_pgoff != 0) 98 return -EINVAL; 99 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) 100 return -EINVAL; 101 102 /* 103 * If this is a GEM object then info->screen_base is the virtual 104 * kernel remapping of the object. FIXME: Review if this is 105 * suitable for our mmap work 106 */ 107 vma->vm_ops = &psb_fbdev_vm_ops; 108 vma->vm_private_data = info; 109 vm_flags_set(vma, VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP); 110 111 return 0; 112 } 113 114 static void psb_fbdev_fb_destroy(struct fb_info *info) 115 { 116 struct drm_fb_helper *fb_helper = info->par; 117 struct drm_framebuffer *fb = fb_helper->fb; 118 struct drm_gem_object *obj = fb->obj[0]; 119 120 drm_fb_helper_fini(fb_helper); 121 122 drm_framebuffer_unregister_private(fb); 123 fb->obj[0] = NULL; 124 drm_framebuffer_cleanup(fb); 125 kfree(fb); 126 127 drm_gem_object_put(obj); 128 129 drm_client_release(&fb_helper->client); 130 131 drm_fb_helper_unprepare(fb_helper); 132 kfree(fb_helper); 133 } 134 135 static const struct fb_ops psb_fbdev_fb_ops = { 136 .owner = THIS_MODULE, 137 __FB_DEFAULT_IOMEM_OPS_RDWR, 138 DRM_FB_HELPER_DEFAULT_OPS, 139 .fb_setcolreg = psb_fbdev_fb_setcolreg, 140 __FB_DEFAULT_IOMEM_OPS_DRAW, 141 .fb_mmap = psb_fbdev_fb_mmap, 142 .fb_destroy = psb_fbdev_fb_destroy, 143 }; 144 145 static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = { 146 }; 147 148 /* 149 * struct drm_driver 150 */ 151 152 int psb_fbdev_driver_fbdev_probe(struct drm_fb_helper *fb_helper, 153 struct drm_fb_helper_surface_size *sizes) 154 { 155 struct drm_device *dev = fb_helper->dev; 156 struct drm_psb_private *dev_priv = to_drm_psb_private(dev); 157 struct pci_dev *pdev = to_pci_dev(dev->dev); 158 struct fb_info *info; 159 struct drm_framebuffer *fb; 160 struct drm_mode_fb_cmd2 mode_cmd = { }; 161 int size; 162 int ret; 163 struct psb_gem_object *backing; 164 struct drm_gem_object *obj; 165 u32 bpp, depth; 166 167 /* No 24-bit packed mode */ 168 if (sizes->surface_bpp == 24) { 169 sizes->surface_bpp = 32; 170 sizes->surface_depth = 24; 171 } 172 bpp = sizes->surface_bpp; 173 depth = sizes->surface_depth; 174 175 /* 176 * If the mode does not fit in 32 bit then switch to 16 bit to get 177 * a console on full resolution. The X mode setting server will 178 * allocate its own 32-bit GEM framebuffer. 179 */ 180 size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) * 181 sizes->surface_height; 182 size = ALIGN(size, PAGE_SIZE); 183 184 if (size > dev_priv->vram_stolen_size) { 185 sizes->surface_bpp = 16; 186 sizes->surface_depth = 16; 187 } 188 bpp = sizes->surface_bpp; 189 depth = sizes->surface_depth; 190 191 mode_cmd.width = sizes->surface_width; 192 mode_cmd.height = sizes->surface_height; 193 mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64); 194 mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth); 195 196 size = mode_cmd.pitches[0] * mode_cmd.height; 197 size = ALIGN(size, PAGE_SIZE); 198 199 /* Allocate the framebuffer in the GTT with stolen page backing */ 200 backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE); 201 if (IS_ERR(backing)) 202 return PTR_ERR(backing); 203 obj = &backing->base; 204 205 fb = psb_framebuffer_create(dev, 206 drm_get_format_info(dev, mode_cmd.pixel_format, 207 mode_cmd.modifier[0]), 208 &mode_cmd, obj); 209 if (IS_ERR(fb)) { 210 ret = PTR_ERR(fb); 211 goto err_drm_gem_object_put; 212 } 213 214 fb_helper->funcs = &psb_fbdev_fb_helper_funcs; 215 fb_helper->fb = fb; 216 217 info = drm_fb_helper_alloc_info(fb_helper); 218 if (IS_ERR(info)) { 219 ret = PTR_ERR(info); 220 goto err_drm_framebuffer_unregister_private; 221 } 222 223 info->fbops = &psb_fbdev_fb_ops; 224 225 /* Accessed stolen memory directly */ 226 info->screen_base = dev_priv->vram_addr + backing->offset; 227 info->screen_size = size; 228 229 drm_fb_helper_fill_info(info, fb_helper, sizes); 230 231 info->fix.smem_start = dev_priv->stolen_base + backing->offset; 232 info->fix.smem_len = size; 233 info->fix.ywrapstep = 0; 234 info->fix.ypanstep = 0; 235 info->fix.mmio_start = pci_resource_start(pdev, 0); 236 info->fix.mmio_len = pci_resource_len(pdev, 0); 237 238 fb_memset_io(info->screen_base, 0, info->screen_size); 239 240 /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */ 241 242 dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height); 243 244 return 0; 245 246 err_drm_framebuffer_unregister_private: 247 drm_framebuffer_unregister_private(fb); 248 fb->obj[0] = NULL; 249 drm_framebuffer_cleanup(fb); 250 kfree(fb); 251 err_drm_gem_object_put: 252 drm_gem_object_put(obj); 253 return ret; 254 } 255