| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * framebuffer driver for VBE 2.0 compliant graphic boards |
| * |
| * switching to graphics mode happens at boot time (while |
| * running in real mode, see arch/i386/boot/video.S). |
| * |
| * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de> |
| * |
| */ |
| |
| #include <linux/aperture.h> |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/delay.h> |
| #include <linux/fb.h> |
| #include <linux/ioport.h> |
| #include <linux/init.h> |
| #include <linux/platform_device.h> |
| #include <linux/screen_info.h> |
| #include <linux/io.h> |
| |
| #include <video/vga.h> |
| |
| #define dac_reg (0x3c8) |
| #define dac_val (0x3c9) |
| |
| /* --------------------------------------------------------------------- */ |
| |
| struct vesafb_par { |
| u32 pseudo_palette[256]; |
| resource_size_t base; |
| resource_size_t size; |
| int wc_cookie; |
| struct resource *region; |
| }; |
| |
| static struct fb_var_screeninfo vesafb_defined = { |
| .activate = FB_ACTIVATE_NOW, |
| .height = -1, |
| .width = -1, |
| .right_margin = 32, |
| .upper_margin = 16, |
| .lower_margin = 4, |
| .vsync_len = 4, |
| .vmode = FB_VMODE_NONINTERLACED, |
| }; |
| |
| static struct fb_fix_screeninfo vesafb_fix = { |
| .id = "VESA VGA", |
| .type = FB_TYPE_PACKED_PIXELS, |
| .accel = FB_ACCEL_NONE, |
| }; |
| |
| static int inverse __read_mostly; |
| static int mtrr __read_mostly; /* disable mtrr */ |
| static int vram_remap; /* Set amount of memory to be used */ |
| static int vram_total; /* Set total amount of memory */ |
| static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */ |
| static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */ |
| static void (*pmi_start)(void) __read_mostly; |
| static void (*pmi_pal) (void) __read_mostly; |
| static int depth __read_mostly; |
| static int vga_compat __read_mostly; |
| /* --------------------------------------------------------------------- */ |
| |
| static int vesafb_pan_display(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| #ifdef __i386__ |
| int offset; |
| |
| offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4; |
| |
| __asm__ __volatile__( |
| "call *(%%edi)" |
| : /* no return value */ |
| : "a" (0x4f07), /* EAX */ |
| "b" (0), /* EBX */ |
| "c" (offset), /* ECX */ |
| "d" (offset >> 16), /* EDX */ |
| "D" (&pmi_start)); /* EDI */ |
| #endif |
| return 0; |
| } |
| |
| static int vesa_setpalette(int regno, unsigned red, unsigned green, |
| unsigned blue) |
| { |
| int shift = 16 - depth; |
| int err = -EINVAL; |
| |
| /* |
| * Try VGA registers first... |
| */ |
| if (vga_compat) { |
| outb_p(regno, dac_reg); |
| outb_p(red >> shift, dac_val); |
| outb_p(green >> shift, dac_val); |
| outb_p(blue >> shift, dac_val); |
| err = 0; |
| } |
| |
| #ifdef __i386__ |
| /* |
| * Fallback to the PMI.... |
| */ |
| if (err && pmi_setpal) { |
| struct { u_char blue, green, red, pad; } entry; |
| |
| entry.red = red >> shift; |
| entry.green = green >> shift; |
| entry.blue = blue >> shift; |
| entry.pad = 0; |
| __asm__ __volatile__( |
| "call *(%%esi)" |
| : /* no return value */ |
| : "a" (0x4f09), /* EAX */ |
| "b" (0), /* EBX */ |
| "c" (1), /* ECX */ |
| "d" (regno), /* EDX */ |
| "D" (&entry), /* EDI */ |
| "S" (&pmi_pal)); /* ESI */ |
| err = 0; |
| } |
| #endif |
| |
| return err; |
| } |
| |
| static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green, |
| unsigned blue, unsigned transp, |
| struct fb_info *info) |
| { |
| int err = 0; |
| |
| /* |
| * Set a single color register. The values supplied are |
| * already rounded down to the hardware's capabilities |
| * (according to the entries in the `var' structure). Return |
| * != 0 for invalid regno. |
| */ |
| |
| if (regno >= info->cmap.len) |
| return 1; |
| |
| if (info->var.bits_per_pixel == 8) |
| err = vesa_setpalette(regno,red,green,blue); |
| else if (regno < 16) { |
| switch (info->var.bits_per_pixel) { |
| case 16: |
| if (info->var.red.offset == 10) { |
| /* 1:5:5:5 */ |
| ((u32*) (info->pseudo_palette))[regno] = |
| ((red & 0xf800) >> 1) | |
| ((green & 0xf800) >> 6) | |
| ((blue & 0xf800) >> 11); |
| } else { |
| /* 0:5:6:5 */ |
| ((u32*) (info->pseudo_palette))[regno] = |
| ((red & 0xf800) ) | |
| ((green & 0xfc00) >> 5) | |
| ((blue & 0xf800) >> 11); |
| } |
| break; |
| case 24: |
| case 32: |
| red >>= 8; |
| green >>= 8; |
| blue >>= 8; |
| ((u32 *)(info->pseudo_palette))[regno] = |
| (red << info->var.red.offset) | |
| (green << info->var.green.offset) | |
| (blue << info->var.blue.offset); |
| break; |
| } |
| } |
| |
| return err; |
| } |
| |
| /* |
| * fb_ops.fb_destroy is called by the last put_fb_info() call at the end |
| * of unregister_framebuffer() or fb_release(). Do any cleanup here. |
| */ |
| static void vesafb_destroy(struct fb_info *info) |
| { |
| struct vesafb_par *par = info->par; |
| |
| fb_dealloc_cmap(&info->cmap); |
| arch_phys_wc_del(par->wc_cookie); |
| if (info->screen_base) |
| iounmap(info->screen_base); |
| release_mem_region(par->base, par->size); |
| |
| framebuffer_release(info); |
| } |
| |
| static struct fb_ops vesafb_ops = { |
| .owner = THIS_MODULE, |
| FB_DEFAULT_IOMEM_OPS, |
| .fb_destroy = vesafb_destroy, |
| .fb_setcolreg = vesafb_setcolreg, |
| .fb_pan_display = vesafb_pan_display, |
| }; |
| |
| static int vesafb_setup(char *options) |
| { |
| char *this_opt; |
| |
| if (!options || !*options) |
| return 0; |
| |
| while ((this_opt = strsep(&options, ",")) != NULL) { |
| if (!*this_opt) continue; |
| |
| if (! strcmp(this_opt, "inverse")) |
| inverse=1; |
| else if (! strcmp(this_opt, "redraw")) |
| ypan=0; |
| else if (! strcmp(this_opt, "ypan")) |
| ypan=1; |
| else if (! strcmp(this_opt, "ywrap")) |
| ypan=2; |
| else if (! strcmp(this_opt, "vgapal")) |
| pmi_setpal=0; |
| else if (! strcmp(this_opt, "pmipal")) |
| pmi_setpal=1; |
| else if (! strncmp(this_opt, "mtrr:", 5)) |
| mtrr = simple_strtoul(this_opt+5, NULL, 0); |
| else if (! strcmp(this_opt, "nomtrr")) |
| mtrr=0; |
| else if (! strncmp(this_opt, "vtotal:", 7)) |
| vram_total = simple_strtoul(this_opt+7, NULL, 0); |
| else if (! strncmp(this_opt, "vremap:", 7)) |
| vram_remap = simple_strtoul(this_opt+7, NULL, 0); |
| } |
| return 0; |
| } |
| |
| static int vesafb_probe(struct platform_device *dev) |
| { |
| struct screen_info *si; |
| struct fb_info *info; |
| struct vesafb_par *par; |
| int i, err; |
| unsigned int size_vmode; |
| unsigned int size_remap; |
| unsigned int size_total; |
| char *option = NULL; |
| |
| /* |
| * If we fail probing the device, the kernel might try a different |
| * driver. We get a copy of the attached screen_info, so that we can |
| * modify its values without affecting later drivers. |
| */ |
| si = dev_get_platdata(&dev->dev); |
| if (!si) |
| return -ENODEV; |
| si = devm_kmemdup(&dev->dev, si, sizeof(*si), GFP_KERNEL); |
| if (!si) |
| return -ENOMEM; |
| |
| /* ignore error return of fb_get_options */ |
| fb_get_options("vesafb", &option); |
| vesafb_setup(option); |
| |
| if (si->orig_video_isVGA != VIDEO_TYPE_VLFB) |
| return -ENODEV; |
| |
| vga_compat = !__screen_info_vbe_mode_nonvga(si); |
| vesafb_fix.smem_start = si->lfb_base; |
| vesafb_defined.bits_per_pixel = si->lfb_depth; |
| if (15 == vesafb_defined.bits_per_pixel) |
| vesafb_defined.bits_per_pixel = 16; |
| vesafb_defined.xres = si->lfb_width; |
| vesafb_defined.yres = si->lfb_height; |
| vesafb_fix.line_length = si->lfb_linelength; |
| vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ? |
| FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; |
| |
| /* size_vmode -- that is the amount of memory needed for the |
| * used video mode, i.e. the minimum amount of |
| * memory we need. */ |
| size_vmode = vesafb_defined.yres * vesafb_fix.line_length; |
| |
| /* size_total -- all video memory we have. Used for mtrr |
| * entries, resource allocation and bounds |
| * checking. */ |
| size_total = si->lfb_size * 65536; |
| if (vram_total) |
| size_total = vram_total * 1024 * 1024; |
| if (size_total < size_vmode) |
| size_total = size_vmode; |
| |
| /* size_remap -- the amount of video memory we are going to |
| * use for vesafb. With modern cards it is no |
| * option to simply use size_total as that |
| * wastes plenty of kernel address space. */ |
| size_remap = size_vmode * 2; |
| if (vram_remap) |
| size_remap = vram_remap * 1024 * 1024; |
| if (size_remap < size_vmode) |
| size_remap = size_vmode; |
| if (size_remap > size_total) |
| size_remap = size_total; |
| vesafb_fix.smem_len = size_remap; |
| |
| #ifndef __i386__ |
| si->vesapm_seg = 0; |
| #endif |
| |
| if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) { |
| printk(KERN_WARNING |
| "vesafb: cannot reserve video memory at 0x%lx\n", |
| vesafb_fix.smem_start); |
| /* We cannot make this fatal. Sometimes this comes from magic |
| spaces our resource handlers simply don't know about */ |
| } |
| |
| info = framebuffer_alloc(sizeof(struct vesafb_par), &dev->dev); |
| if (!info) { |
| release_mem_region(vesafb_fix.smem_start, size_total); |
| return -ENOMEM; |
| } |
| platform_set_drvdata(dev, info); |
| par = info->par; |
| info->pseudo_palette = par->pseudo_palette; |
| |
| par->base = si->lfb_base; |
| par->size = size_total; |
| |
| printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n", |
| vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, |
| vesafb_fix.line_length, si->pages); |
| |
| if (si->vesapm_seg) { |
| printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", |
| si->vesapm_seg, si->vesapm_off); |
| } |
| |
| if (si->vesapm_seg < 0xc000) |
| ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ |
| |
| if (ypan || pmi_setpal) { |
| unsigned long pmi_phys; |
| unsigned short *pmi_base; |
| pmi_phys = ((unsigned long)si->vesapm_seg << 4) + si->vesapm_off; |
| pmi_base = (unsigned short *)phys_to_virt(pmi_phys); |
| pmi_start = (void*)((char*)pmi_base + pmi_base[1]); |
| pmi_pal = (void*)((char*)pmi_base + pmi_base[2]); |
| printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal); |
| if (pmi_base[3]) { |
| printk(KERN_INFO "vesafb: pmi: ports = "); |
| for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++) |
| printk("%x ", pmi_base[i]); |
| printk("\n"); |
| if (pmi_base[i] != 0xffff) { |
| /* |
| * memory areas not supported (yet?) |
| * |
| * Rules are: we have to set up a descriptor for the requested |
| * memory area and pass it in the ES register to the BIOS function. |
| */ |
| printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n"); |
| ypan = pmi_setpal = 0; |
| } |
| } |
| } |
| |
| if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) { |
| printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n" |
| " colors may be incorrect\n"); |
| vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; |
| } |
| |
| vesafb_defined.xres_virtual = vesafb_defined.xres; |
| vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length; |
| if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) { |
| printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n", |
| (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual); |
| } else { |
| printk(KERN_INFO "vesafb: scrolling: redraw\n"); |
| vesafb_defined.yres_virtual = vesafb_defined.yres; |
| ypan = 0; |
| } |
| |
| /* some dummy values for timing to make fbset happy */ |
| vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres; |
| vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8; |
| vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8; |
| |
| vesafb_defined.red.offset = si->red_pos; |
| vesafb_defined.red.length = si->red_size; |
| vesafb_defined.green.offset = si->green_pos; |
| vesafb_defined.green.length = si->green_size; |
| vesafb_defined.blue.offset = si->blue_pos; |
| vesafb_defined.blue.length = si->blue_size; |
| vesafb_defined.transp.offset = si->rsvd_pos; |
| vesafb_defined.transp.length = si->rsvd_size; |
| |
| if (vesafb_defined.bits_per_pixel <= 8) { |
| depth = vesafb_defined.green.length; |
| vesafb_defined.red.length = |
| vesafb_defined.green.length = |
| vesafb_defined.blue.length = |
| vesafb_defined.bits_per_pixel; |
| } |
| |
| printk(KERN_INFO "vesafb: %s: " |
| "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n", |
| (vesafb_defined.bits_per_pixel > 8) ? |
| "Truecolor" : (vga_compat || pmi_setpal) ? |
| "Pseudocolor" : "Static Pseudocolor", |
| si->rsvd_size, |
| si->red_size, |
| si->green_size, |
| si->blue_size, |
| si->rsvd_pos, |
| si->red_pos, |
| si->green_pos, |
| si->blue_pos); |
| |
| vesafb_fix.ypanstep = ypan ? 1 : 0; |
| vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0; |
| |
| /* request failure does not faze us, as vgacon probably has this |
| * region already (FIXME) */ |
| par->region = request_region(0x3c0, 32, "vesafb"); |
| |
| if (mtrr == 3) { |
| unsigned int temp_size = size_total; |
| |
| /* Find the largest power-of-two */ |
| temp_size = roundup_pow_of_two(temp_size); |
| |
| /* Try and find a power of two to add */ |
| do { |
| par->wc_cookie = |
| arch_phys_wc_add(vesafb_fix.smem_start, |
| temp_size); |
| temp_size >>= 1; |
| } while (temp_size >= PAGE_SIZE && par->wc_cookie < 0); |
| |
| info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len); |
| } else { |
| if (mtrr && mtrr != 3) |
| WARN_ONCE(1, "Only MTRR_TYPE_WRCOMB (3) make sense\n"); |
| info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len); |
| } |
| |
| if (!info->screen_base) { |
| printk(KERN_ERR |
| "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n", |
| vesafb_fix.smem_len, vesafb_fix.smem_start); |
| err = -EIO; |
| goto err_release_region; |
| } |
| |
| printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, " |
| "using %dk, total %dk\n", |
| vesafb_fix.smem_start, info->screen_base, |
| size_remap/1024, size_total/1024); |
| |
| if (!ypan) |
| vesafb_ops.fb_pan_display = NULL; |
| |
| info->fbops = &vesafb_ops; |
| info->var = vesafb_defined; |
| info->fix = vesafb_fix; |
| info->flags = (ypan ? FBINFO_HWACCEL_YPAN : 0); |
| |
| if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { |
| err = -ENOMEM; |
| goto err_release_region; |
| } |
| err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size); |
| if (err) |
| goto err_fb_dealloc_cmap; |
| if (register_framebuffer(info)<0) { |
| err = -EINVAL; |
| goto err_fb_dealloc_cmap; |
| } |
| fb_info(info, "%s frame buffer device\n", info->fix.id); |
| return 0; |
| err_fb_dealloc_cmap: |
| fb_dealloc_cmap(&info->cmap); |
| err_release_region: |
| arch_phys_wc_del(par->wc_cookie); |
| if (info->screen_base) |
| iounmap(info->screen_base); |
| if (par->region) |
| release_region(0x3c0, 32); |
| framebuffer_release(info); |
| release_mem_region(vesafb_fix.smem_start, size_total); |
| return err; |
| } |
| |
| static void vesafb_remove(struct platform_device *pdev) |
| { |
| struct fb_info *info = platform_get_drvdata(pdev); |
| |
| if (((struct vesafb_par *)(info->par))->region) |
| release_region(0x3c0, 32); |
| |
| /* vesafb_destroy takes care of info cleanup */ |
| unregister_framebuffer(info); |
| } |
| |
| static struct platform_driver vesafb_driver = { |
| .driver = { |
| .name = "vesa-framebuffer", |
| }, |
| .probe = vesafb_probe, |
| .remove_new = vesafb_remove, |
| }; |
| |
| module_platform_driver(vesafb_driver); |
| MODULE_LICENSE("GPL"); |