diff options
Diffstat (limited to 'drivers/video/fbdev/vesafb.c')
| -rw-r--r-- | drivers/video/fbdev/vesafb.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c new file mode 100644 index 000000000..df6de5a9d --- /dev/null +++ b/drivers/video/fbdev/vesafb.c @@ -0,0 +1,504 @@ +// 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/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]; + 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; +} + +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(info->apertures->ranges[0].base, info->apertures->ranges[0].size); +} + +static struct fb_ops vesafb_ops = { + .owner = THIS_MODULE, + .fb_destroy = vesafb_destroy, + .fb_setcolreg = vesafb_setcolreg, + .fb_pan_display = vesafb_pan_display, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + +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 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; + + /* ignore error return of fb_get_options */ + fb_get_options("vesafb", &option); + vesafb_setup(option); + + if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB) + return -ENODEV; + + vga_compat = (screen_info.capabilities & 2) ? 0 : 1; + vesafb_fix.smem_start = screen_info.lfb_base; + vesafb_defined.bits_per_pixel = screen_info.lfb_depth; + if (15 == vesafb_defined.bits_per_pixel) + vesafb_defined.bits_per_pixel = 16; + vesafb_defined.xres = screen_info.lfb_width; + vesafb_defined.yres = screen_info.lfb_height; + vesafb_fix.line_length = screen_info.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 = screen_info.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__ + screen_info.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; + + /* set vesafb aperture size for generic probing */ + info->apertures = alloc_apertures(1); + if (!info->apertures) { + err = -ENOMEM; + goto err; + } + info->apertures->ranges[0].base = screen_info.lfb_base; + info->apertures->ranges[0].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, screen_info.pages); + + if (screen_info.vesapm_seg) { + printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n", + screen_info.vesapm_seg,screen_info.vesapm_off); + } + + if (screen_info.vesapm_seg < 0xc000) + ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */ + + if (ypan || pmi_setpal) { + unsigned short *pmi_base; + pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off); + 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 = screen_info.red_pos; + vesafb_defined.red.length = screen_info.red_size; + vesafb_defined.green.offset = screen_info.green_pos; + vesafb_defined.green.length = screen_info.green_size; + vesafb_defined.blue.offset = screen_info.blue_pos; + vesafb_defined.blue.length = screen_info.blue_size; + vesafb_defined.transp.offset = screen_info.rsvd_pos; + vesafb_defined.transp.length = screen_info.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", + screen_info.rsvd_size, + screen_info.red_size, + screen_info.green_size, + screen_info.blue_size, + screen_info.rsvd_pos, + screen_info.red_pos, + screen_info.green_pos, + screen_info.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 = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE | + (ypan ? FBINFO_HWACCEL_YPAN : 0); + + if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { + err = -ENOMEM; + goto err_release_region; + } + if (register_framebuffer(info)<0) { + err = -EINVAL; + fb_dealloc_cmap(&info->cmap); + goto err_release_region; + } + fb_info(info, "%s frame buffer device\n", info->fix.id); + return 0; +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); +err: + framebuffer_release(info); + release_mem_region(vesafb_fix.smem_start, size_total); + return err; +} + +static int vesafb_remove(struct platform_device *pdev) +{ + struct fb_info *info = platform_get_drvdata(pdev); + + unregister_framebuffer(info); + if (((struct vesafb_par *)(info->par))->region) + release_region(0x3c0, 32); + framebuffer_release(info); + + return 0; +} + +static struct platform_driver vesafb_driver = { + .driver = { + .name = "vesa-framebuffer", + }, + .probe = vesafb_probe, + .remove = vesafb_remove, +}; + +module_platform_driver(vesafb_driver); +MODULE_LICENSE("GPL"); |