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kernel-ark/drivers/video/fbdev/vesafb.c
Luis R. Rodriguez 127b0c94cf video: fbdev: vesafb: use arch_phys_wc_add() 
This driver uses the same area for MTRR as for the ioremap_wc(), if
anything it just uses a smaller size in case MTRR reservation fails.
ioremap_wc() API is already used to take advantage of architecture
write-combining when available.

Convert the driver from using the x86 specific MTRR code to
the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add()
will avoid MTRR if write-combining is available.

There are a few motivations for this:

a) Take advantage of PAT when available

b) Help bury MTRR code away, MTRR is architecture specific and on
   x86 its replaced by PAT

c) Help with the goal of eventually using _PAGE_CACHE_UC over
   _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (see commit
   de33c442e titled "x86 PAT: fix performance drop for glx,
   use UC minus for ioremap(), ioremap_nocache() and
   pci_mmap_page_range()")

The conversion done is expressed by the following Coccinelle
SmPL patch, it additionally required manual intervention to
address all the #ifdery and removal of redundant things which
arch_phys_wc_add() already addresses such as verbose message
about when MTRR fails and doing nothing when we didn't get
an MTRR.

@ mtrr_found @
expression index, base, size;
@@

-index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+index = arch_phys_wc_add(base, size);

@ mtrr_rm depends on mtrr_found @
expression mtrr_found.index, mtrr_found.base, mtrr_found.size;
@@

-mtrr_del(index, base, size);
+arch_phys_wc_del(index);

@ mtrr_rm_zero_arg depends on mtrr_found @
expression mtrr_found.index;
@@

-mtrr_del(index, 0, 0);
+arch_phys_wc_del(index);

@ mtrr_rm_fb_info depends on mtrr_found @
struct fb_info *info;
expression mtrr_found.index;
@@

-mtrr_del(index, info->fix.smem_start, info->fix.smem_len);
+arch_phys_wc_del(index);

@ ioremap_replace_nocache depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap_nocache(base, size);
+info->screen_base = ioremap_wc(base, size);

@ ioremap_replace_default depends on mtrr_found @
struct fb_info *info;
expression base, size;
@@

-info->screen_base = ioremap(base, size);
+info->screen_base = ioremap_wc(base, size);

Generated-by: Coccinelle SmPL
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2015-06-16 09:42:11 +03:00

498 lines
14 KiB
C
Raw Blame History

/*
* 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;
};
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) */
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;
}
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);
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 (!ypan)
info->fbops->fb_pan_display = NULL;
if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
err = -ENOMEM;
goto err;
}
if (register_framebuffer(info)<0) {
err = -EINVAL;
fb_dealloc_cmap(&info->cmap);
goto err;
}
fb_info(info, "%s frame buffer device\n", info->fix.id);
return 0;
err:
arch_phys_wc_del(par->wc_cookie);
if (info->screen_base)
iounmap(info->screen_base);
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);
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");
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