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511 lines
15 KiB
511 lines
15 KiB
// 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 <[email protected]> |
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* |
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*/ |
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|
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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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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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/* |
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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(info->apertures->ranges[0].base, info->apertures->ranges[0].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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/* set vesafb aperture size for generic probing */ |
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info->apertures = alloc_apertures(1); |
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if (!info->apertures) { |
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err = -ENOMEM; |
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goto err; |
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} |
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info->apertures->ranges[0].base = screen_info.lfb_base; |
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info->apertures->ranges[0].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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|
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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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|
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if (mtrr == 3) { |
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unsigned int temp_size = size_total; |
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|
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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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|
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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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|
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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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|
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if (!ypan) |
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vesafb_ops.fb_pan_display = NULL; |
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|
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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 | FBINFO_MISC_FIRMWARE | |
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(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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if (register_framebuffer(info)<0) { |
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err = -EINVAL; |
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fb_dealloc_cmap(&info->cmap); |
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goto err_release_region; |
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} |
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fb_info(info, "%s frame buffer device\n", info->fix.id); |
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return 0; |
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err_release_region: |
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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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if (par->region) |
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release_region(0x3c0, 32); |
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err: |
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framebuffer_release(info); |
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release_mem_region(vesafb_fix.smem_start, size_total); |
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return err; |
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} |
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|
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static int vesafb_remove(struct platform_device *pdev) |
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{ |
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struct fb_info *info = platform_get_drvdata(pdev); |
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|
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if (((struct vesafb_par *)(info->par))->region) |
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release_region(0x3c0, 32); |
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|
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/* vesafb_destroy takes care of info cleanup */ |
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unregister_framebuffer(info); |
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|
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return 0; |
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} |
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|
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static struct platform_driver vesafb_driver = { |
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.driver = { |
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.name = "vesa-framebuffer", |
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}, |
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.probe = vesafb_probe, |
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.remove = vesafb_remove, |
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}; |
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|
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module_platform_driver(vesafb_driver); |
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MODULE_LICENSE("GPL");
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