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