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gbefb.c
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gbefb.c
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/*
* SGI GBE frame buffer driver
*
* Copyright (C) 1999 Silicon Graphics, Inc. - Jeffrey Newquist
* Copyright (C) 2002 Vivien Chappelier <vivien.chappelier@linux-mips.org>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/gfp.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#ifdef CONFIG_X86
#include <asm/mtrr.h>
#endif
#ifdef CONFIG_MIPS
#include <asm/addrspace.h>
#endif
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/tlbflush.h>
#include <video/gbe.h>
static struct sgi_gbe *gbe;
struct gbefb_par {
struct fb_var_screeninfo var;
struct gbe_timing_info timing;
int valid;
};
#ifdef CONFIG_SGI_IP32
#define GBE_BASE 0x16000000 /* SGI O2 */
#endif
#ifdef CONFIG_X86_VISWS
#define GBE_BASE 0xd0000000 /* SGI Visual Workstation */
#endif
/* macro for fastest write-though access to the framebuffer */
#ifdef CONFIG_MIPS
#ifdef CONFIG_CPU_R10000
#define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_UNCACHED_ACCELERATED)
#else
#define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_CACHABLE_NO_WA)
#endif
#endif
#ifdef CONFIG_X86
#define pgprot_fb(_prot) ((_prot) | _PAGE_PCD)
#endif
/*
* RAM we reserve for the frame buffer. This defines the maximum screen
* size
*/
#if CONFIG_FB_GBE_MEM > 8
#error GBE Framebuffer cannot use more than 8MB of memory
#endif
#define TILE_SHIFT 16
#define TILE_SIZE (1 << TILE_SHIFT)
#define TILE_MASK (TILE_SIZE - 1)
static unsigned int gbe_mem_size = CONFIG_FB_GBE_MEM * 1024*1024;
static void *gbe_mem;
static dma_addr_t gbe_dma_addr;
static unsigned long gbe_mem_phys;
static struct {
uint16_t *cpu;
dma_addr_t dma;
} gbe_tiles;
static int gbe_revision;
static int ypan, ywrap;
static uint32_t pseudo_palette[16];
static uint32_t gbe_cmap[256];
static int gbe_turned_on; /* 0 turned off, 1 turned on */
static char *mode_option __devinitdata = NULL;
/* default CRT mode */
static struct fb_var_screeninfo default_var_CRT __devinitdata = {
/* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */
.xres = 640,
.yres = 480,
.xres_virtual = 640,
.yres_virtual = 480,
.xoffset = 0,
.yoffset = 0,
.bits_per_pixel = 8,
.grayscale = 0,
.red = { 0, 8, 0 },
.green = { 0, 8, 0 },
.blue = { 0, 8, 0 },
.transp = { 0, 0, 0 },
.nonstd = 0,
.activate = 0,
.height = -1,
.width = -1,
.accel_flags = 0,
.pixclock = 39722, /* picoseconds */
.left_margin = 48,
.right_margin = 16,
.upper_margin = 33,
.lower_margin = 10,
.hsync_len = 96,
.vsync_len = 2,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
};
/* default LCD mode */
static struct fb_var_screeninfo default_var_LCD __devinitdata = {
/* 1600x1024, 8 bpp */
.xres = 1600,
.yres = 1024,
.xres_virtual = 1600,
.yres_virtual = 1024,
.xoffset = 0,
.yoffset = 0,
.bits_per_pixel = 8,
.grayscale = 0,
.red = { 0, 8, 0 },
.green = { 0, 8, 0 },
.blue = { 0, 8, 0 },
.transp = { 0, 0, 0 },
.nonstd = 0,
.activate = 0,
.height = -1,
.width = -1,
.accel_flags = 0,
.pixclock = 9353,
.left_margin = 20,
.right_margin = 30,
.upper_margin = 37,
.lower_margin = 3,
.hsync_len = 20,
.vsync_len = 3,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED
};
/* default modedb mode */
/* 640x480, 60 Hz, Non-Interlaced (25.172 MHz dotclock) */
static struct fb_videomode default_mode_CRT __devinitdata = {
.refresh = 60,
.xres = 640,
.yres = 480,
.pixclock = 39722,
.left_margin = 48,
.right_margin = 16,
.upper_margin = 33,
.lower_margin = 10,
.hsync_len = 96,
.vsync_len = 2,
.sync = 0,
.vmode = FB_VMODE_NONINTERLACED,
};
/* 1600x1024 SGI flatpanel 1600sw */
static struct fb_videomode default_mode_LCD __devinitdata = {
/* 1600x1024, 8 bpp */
.xres = 1600,
.yres = 1024,
.pixclock = 9353,
.left_margin = 20,
.right_margin = 30,
.upper_margin = 37,
.lower_margin = 3,
.hsync_len = 20,
.vsync_len = 3,
.vmode = FB_VMODE_NONINTERLACED,
};
static struct fb_videomode *default_mode __devinitdata = &default_mode_CRT;
static struct fb_var_screeninfo *default_var __devinitdata = &default_var_CRT;
static int flat_panel_enabled = 0;
static void gbe_reset(void)
{
/* Turn on dotclock PLL */
gbe->ctrlstat = 0x300aa000;
}
/*
* Function: gbe_turn_off
* Parameters: (None)
* Description: This should turn off the monitor and gbe. This is used
* when switching between the serial console and the graphics
* console.
*/
static void gbe_turn_off(void)
{
int i;
unsigned int val, x, y, vpixen_off;
gbe_turned_on = 0;
/* check if pixel counter is on */
val = gbe->vt_xy;
if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 1)
return;
/* turn off DMA */
val = gbe->ovr_control;
SET_GBE_FIELD(OVR_CONTROL, OVR_DMA_ENABLE, val, 0);
gbe->ovr_control = val;
udelay(1000);
val = gbe->frm_control;
SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 0);
gbe->frm_control = val;
udelay(1000);
val = gbe->did_control;
SET_GBE_FIELD(DID_CONTROL, DID_DMA_ENABLE, val, 0);
gbe->did_control = val;
udelay(1000);
/* We have to wait through two vertical retrace periods before
* the pixel DMA is turned off for sure. */
for (i = 0; i < 10000; i++) {
val = gbe->frm_inhwctrl;
if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val)) {
udelay(10);
} else {
val = gbe->ovr_inhwctrl;
if (GET_GBE_FIELD(OVR_INHWCTRL, OVR_DMA_ENABLE, val)) {
udelay(10);
} else {
val = gbe->did_inhwctrl;
if (GET_GBE_FIELD(DID_INHWCTRL, DID_DMA_ENABLE, val)) {
udelay(10);
} else
break;
}
}
}
if (i == 10000)
printk(KERN_ERR "gbefb: turn off DMA timed out\n");
/* wait for vpixen_off */
val = gbe->vt_vpixen;
vpixen_off = GET_GBE_FIELD(VT_VPIXEN, VPIXEN_OFF, val);
for (i = 0; i < 100000; i++) {
val = gbe->vt_xy;
x = GET_GBE_FIELD(VT_XY, X, val);
y = GET_GBE_FIELD(VT_XY, Y, val);
if (y < vpixen_off)
break;
udelay(1);
}
if (i == 100000)
printk(KERN_ERR
"gbefb: wait for vpixen_off timed out\n");
for (i = 0; i < 10000; i++) {
val = gbe->vt_xy;
x = GET_GBE_FIELD(VT_XY, X, val);
y = GET_GBE_FIELD(VT_XY, Y, val);
if (y > vpixen_off)
break;
udelay(1);
}
if (i == 10000)
printk(KERN_ERR "gbefb: wait for vpixen_off timed out\n");
/* turn off pixel counter */
val = 0;
SET_GBE_FIELD(VT_XY, FREEZE, val, 1);
gbe->vt_xy = val;
udelay(10000);
for (i = 0; i < 10000; i++) {
val = gbe->vt_xy;
if (GET_GBE_FIELD(VT_XY, FREEZE, val) != 1)
udelay(10);
else
break;
}
if (i == 10000)
printk(KERN_ERR "gbefb: turn off pixel clock timed out\n");
/* turn off dot clock */
val = gbe->dotclock;
SET_GBE_FIELD(DOTCLK, RUN, val, 0);
gbe->dotclock = val;
udelay(10000);
for (i = 0; i < 10000; i++) {
val = gbe->dotclock;
if (GET_GBE_FIELD(DOTCLK, RUN, val))
udelay(10);
else
break;
}
if (i == 10000)
printk(KERN_ERR "gbefb: turn off dotclock timed out\n");
/* reset the frame DMA FIFO */
val = gbe->frm_size_tile;
SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 1);
gbe->frm_size_tile = val;
SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 0);
gbe->frm_size_tile = val;
}
static void gbe_turn_on(void)
{
unsigned int val, i;
/*
* Check if pixel counter is off, for unknown reason this
* code hangs Visual Workstations
*/
if (gbe_revision < 2) {
val = gbe->vt_xy;
if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 0)
return;
}
/* turn on dot clock */
val = gbe->dotclock;
SET_GBE_FIELD(DOTCLK, RUN, val, 1);
gbe->dotclock = val;
udelay(10000);
for (i = 0; i < 10000; i++) {
val = gbe->dotclock;
if (GET_GBE_FIELD(DOTCLK, RUN, val) != 1)
udelay(10);
else
break;
}
if (i == 10000)
printk(KERN_ERR "gbefb: turn on dotclock timed out\n");
/* turn on pixel counter */
val = 0;
SET_GBE_FIELD(VT_XY, FREEZE, val, 0);
gbe->vt_xy = val;
udelay(10000);
for (i = 0; i < 10000; i++) {
val = gbe->vt_xy;
if (GET_GBE_FIELD(VT_XY, FREEZE, val))
udelay(10);
else
break;
}
if (i == 10000)
printk(KERN_ERR "gbefb: turn on pixel clock timed out\n");
/* turn on DMA */
val = gbe->frm_control;
SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 1);
gbe->frm_control = val;
udelay(1000);
for (i = 0; i < 10000; i++) {
val = gbe->frm_inhwctrl;
if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val) != 1)
udelay(10);
else
break;
}
if (i == 10000)
printk(KERN_ERR "gbefb: turn on DMA timed out\n");
gbe_turned_on = 1;
}
static void gbe_loadcmap(void)
{
int i, j;
for (i = 0; i < 256; i++) {
for (j = 0; j < 1000 && gbe->cm_fifo >= 63; j++)
udelay(10);
if (j == 1000)
printk(KERN_ERR "gbefb: cmap FIFO timeout\n");
gbe->cmap[i] = gbe_cmap[i];
}
}
/*
* Blank the display.
*/
static int gbefb_blank(int blank, struct fb_info *info)
{
/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
switch (blank) {
case FB_BLANK_UNBLANK: /* unblank */
gbe_turn_on();
gbe_loadcmap();
break;
case FB_BLANK_NORMAL: /* blank */
gbe_turn_off();
break;
default:
/* Nothing */
break;
}
return 0;
}
/*
* Setup flatpanel related registers.
*/
static void gbefb_setup_flatpanel(struct gbe_timing_info *timing)
{
int fp_wid, fp_hgt, fp_vbs, fp_vbe;
u32 outputVal = 0;
SET_GBE_FIELD(VT_FLAGS, HDRV_INVERT, outputVal,
(timing->flags & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1);
SET_GBE_FIELD(VT_FLAGS, VDRV_INVERT, outputVal,
(timing->flags & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1);
gbe->vt_flags = outputVal;
/* Turn on the flat panel */
fp_wid = 1600;
fp_hgt = 1024;
fp_vbs = 0;
fp_vbe = 1600;
timing->pll_m = 4;
timing->pll_n = 1;
timing->pll_p = 0;
outputVal = 0;
SET_GBE_FIELD(FP_DE, ON, outputVal, fp_vbs);
SET_GBE_FIELD(FP_DE, OFF, outputVal, fp_vbe);
gbe->fp_de = outputVal;
outputVal = 0;
SET_GBE_FIELD(FP_HDRV, OFF, outputVal, fp_wid);
gbe->fp_hdrv = outputVal;
outputVal = 0;
SET_GBE_FIELD(FP_VDRV, ON, outputVal, 1);
SET_GBE_FIELD(FP_VDRV, OFF, outputVal, fp_hgt + 1);
gbe->fp_vdrv = outputVal;
}
struct gbe_pll_info {
int clock_rate;
int fvco_min;
int fvco_max;
};
static struct gbe_pll_info gbe_pll_table[2] = {
{ 20, 80, 220 },
{ 27, 80, 220 },
};
static int compute_gbe_timing(struct fb_var_screeninfo *var,
struct gbe_timing_info *timing)
{
int pll_m, pll_n, pll_p, error, best_m, best_n, best_p, best_error;
int pixclock;
struct gbe_pll_info *gbe_pll;
if (gbe_revision < 2)
gbe_pll = &gbe_pll_table[0];
else
gbe_pll = &gbe_pll_table[1];
/* Determine valid resolution and timing
* GBE crystal runs at 20Mhz or 27Mhz
* pll_m, pll_n, pll_p define the following frequencies
* fvco = pll_m * 20Mhz / pll_n
* fout = fvco / (2**pll_p) */
best_error = 1000000000;
best_n = best_m = best_p = 0;
for (pll_p = 0; pll_p < 4; pll_p++)
for (pll_m = 1; pll_m < 256; pll_m++)
for (pll_n = 1; pll_n < 64; pll_n++) {
pixclock = (1000000 / gbe_pll->clock_rate) *
(pll_n << pll_p) / pll_m;
error = var->pixclock - pixclock;
if (error < 0)
error = -error;
if (error < best_error &&
pll_m / pll_n >
gbe_pll->fvco_min / gbe_pll->clock_rate &&
pll_m / pll_n <
gbe_pll->fvco_max / gbe_pll->clock_rate) {
best_error = error;
best_m = pll_m;
best_n = pll_n;
best_p = pll_p;
}
}
if (!best_n || !best_m)
return -EINVAL; /* Resolution to high */
pixclock = (1000000 / gbe_pll->clock_rate) *
(best_n << best_p) / best_m;
/* set video timing information */
if (timing) {
timing->width = var->xres;
timing->height = var->yres;
timing->pll_m = best_m;
timing->pll_n = best_n;
timing->pll_p = best_p;
timing->cfreq = gbe_pll->clock_rate * 1000 * timing->pll_m /
(timing->pll_n << timing->pll_p);
timing->htotal = var->left_margin + var->xres +
var->right_margin + var->hsync_len;
timing->vtotal = var->upper_margin + var->yres +
var->lower_margin + var->vsync_len;
timing->fields_sec = 1000 * timing->cfreq / timing->htotal *
1000 / timing->vtotal;
timing->hblank_start = var->xres;
timing->vblank_start = var->yres;
timing->hblank_end = timing->htotal;
timing->hsync_start = var->xres + var->right_margin + 1;
timing->hsync_end = timing->hsync_start + var->hsync_len;
timing->vblank_end = timing->vtotal;
timing->vsync_start = var->yres + var->lower_margin + 1;
timing->vsync_end = timing->vsync_start + var->vsync_len;
}
return pixclock;
}
static void gbe_set_timing_info(struct gbe_timing_info *timing)
{
int temp;
unsigned int val;
/* setup dot clock PLL */
val = 0;
SET_GBE_FIELD(DOTCLK, M, val, timing->pll_m - 1);
SET_GBE_FIELD(DOTCLK, N, val, timing->pll_n - 1);
SET_GBE_FIELD(DOTCLK, P, val, timing->pll_p);
SET_GBE_FIELD(DOTCLK, RUN, val, 0); /* do not start yet */
gbe->dotclock = val;
udelay(10000);
/* setup pixel counter */
val = 0;
SET_GBE_FIELD(VT_XYMAX, MAXX, val, timing->htotal);
SET_GBE_FIELD(VT_XYMAX, MAXY, val, timing->vtotal);
gbe->vt_xymax = val;
/* setup video timing signals */
val = 0;
SET_GBE_FIELD(VT_VSYNC, VSYNC_ON, val, timing->vsync_start);
SET_GBE_FIELD(VT_VSYNC, VSYNC_OFF, val, timing->vsync_end);
gbe->vt_vsync = val;
val = 0;
SET_GBE_FIELD(VT_HSYNC, HSYNC_ON, val, timing->hsync_start);
SET_GBE_FIELD(VT_HSYNC, HSYNC_OFF, val, timing->hsync_end);
gbe->vt_hsync = val;
val = 0;
SET_GBE_FIELD(VT_VBLANK, VBLANK_ON, val, timing->vblank_start);
SET_GBE_FIELD(VT_VBLANK, VBLANK_OFF, val, timing->vblank_end);
gbe->vt_vblank = val;
val = 0;
SET_GBE_FIELD(VT_HBLANK, HBLANK_ON, val,
timing->hblank_start - 5);
SET_GBE_FIELD(VT_HBLANK, HBLANK_OFF, val,
timing->hblank_end - 3);
gbe->vt_hblank = val;
/* setup internal timing signals */
val = 0;
SET_GBE_FIELD(VT_VCMAP, VCMAP_ON, val, timing->vblank_start);
SET_GBE_FIELD(VT_VCMAP, VCMAP_OFF, val, timing->vblank_end);
gbe->vt_vcmap = val;
val = 0;
SET_GBE_FIELD(VT_HCMAP, HCMAP_ON, val, timing->hblank_start);
SET_GBE_FIELD(VT_HCMAP, HCMAP_OFF, val, timing->hblank_end);
gbe->vt_hcmap = val;
val = 0;
temp = timing->vblank_start - timing->vblank_end - 1;
if (temp > 0)
temp = -temp;
if (flat_panel_enabled)
gbefb_setup_flatpanel(timing);
SET_GBE_FIELD(DID_START_XY, DID_STARTY, val, (u32) temp);
if (timing->hblank_end >= 20)
SET_GBE_FIELD(DID_START_XY, DID_STARTX, val,
timing->hblank_end - 20);
else
SET_GBE_FIELD(DID_START_XY, DID_STARTX, val,
timing->htotal - (20 - timing->hblank_end));
gbe->did_start_xy = val;
val = 0;
SET_GBE_FIELD(CRS_START_XY, CRS_STARTY, val, (u32) (temp + 1));
if (timing->hblank_end >= GBE_CRS_MAGIC)
SET_GBE_FIELD(CRS_START_XY, CRS_STARTX, val,
timing->hblank_end - GBE_CRS_MAGIC);
else
SET_GBE_FIELD(CRS_START_XY, CRS_STARTX, val,
timing->htotal - (GBE_CRS_MAGIC -
timing->hblank_end));
gbe->crs_start_xy = val;
val = 0;
SET_GBE_FIELD(VC_START_XY, VC_STARTY, val, (u32) temp);
SET_GBE_FIELD(VC_START_XY, VC_STARTX, val, timing->hblank_end - 4);
gbe->vc_start_xy = val;
val = 0;
temp = timing->hblank_end - GBE_PIXEN_MAGIC_ON;
if (temp < 0)
temp += timing->htotal; /* allow blank to wrap around */
SET_GBE_FIELD(VT_HPIXEN, HPIXEN_ON, val, temp);
SET_GBE_FIELD(VT_HPIXEN, HPIXEN_OFF, val,
((temp + timing->width -
GBE_PIXEN_MAGIC_OFF) % timing->htotal));
gbe->vt_hpixen = val;
val = 0;
SET_GBE_FIELD(VT_VPIXEN, VPIXEN_ON, val, timing->vblank_end);
SET_GBE_FIELD(VT_VPIXEN, VPIXEN_OFF, val, timing->vblank_start);
gbe->vt_vpixen = val;
/* turn off sync on green */
val = 0;
SET_GBE_FIELD(VT_FLAGS, SYNC_LOW, val, 1);
gbe->vt_flags = val;
}
/*
* Set the hardware according to 'par'.
*/
static int gbefb_set_par(struct fb_info *info)
{
int i;
unsigned int val;
int wholeTilesX, partTilesX, maxPixelsPerTileX;
int height_pix;
int xpmax, ypmax; /* Monitor resolution */
int bytesPerPixel; /* Bytes per pixel */
struct gbefb_par *par = (struct gbefb_par *) info->par;
compute_gbe_timing(&info->var, &par->timing);
bytesPerPixel = info->var.bits_per_pixel / 8;
info->fix.line_length = info->var.xres_virtual * bytesPerPixel;
xpmax = par->timing.width;
ypmax = par->timing.height;
/* turn off GBE */
gbe_turn_off();
/* set timing info */
gbe_set_timing_info(&par->timing);
/* initialize DIDs */
val = 0;
switch (bytesPerPixel) {
case 1:
SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_I8);
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
case 2:
SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_ARGB5);
info->fix.visual = FB_VISUAL_TRUECOLOR;
break;
case 4:
SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_RGB8);
info->fix.visual = FB_VISUAL_TRUECOLOR;
break;
}
SET_GBE_FIELD(WID, BUF, val, GBE_BMODE_BOTH);
for (i = 0; i < 32; i++)
gbe->mode_regs[i] = val;
/* Initialize interrupts */
gbe->vt_intr01 = 0xffffffff;
gbe->vt_intr23 = 0xffffffff;
/* HACK:
The GBE hardware uses a tiled memory to screen mapping. Tiles are
blocks of 512x128, 256x128 or 128x128 pixels, respectively for 8bit,
16bit and 32 bit modes (64 kB). They cover the screen with partial
tiles on the right and/or bottom of the screen if needed.
For example in 640x480 8 bit mode the mapping is:
<-------- 640 ----->
<---- 512 ----><128|384 offscreen>
^ ^
| 128 [tile 0] [tile 1]
| v
^
4 128 [tile 2] [tile 3]
8 v
0 ^
128 [tile 4] [tile 5]
| v
| ^
v 96 [tile 6] [tile 7]
32 offscreen
Tiles have the advantage that they can be allocated individually in
memory. However, this mapping is not linear at all, which is not
really convenient. In order to support linear addressing, the GBE
DMA hardware is fooled into thinking the screen is only one tile
large and but has a greater height, so that the DMA transfer covers
the same region.
Tiles are still allocated as independent chunks of 64KB of
continuous physical memory and remapped so that the kernel sees the
framebuffer as a continuous virtual memory. The GBE tile table is
set up so that each tile references one of these 64k blocks:
GBE -> tile list framebuffer TLB <------------ CPU
[ tile 0 ] -> [ 64KB ] <- [ 16x 4KB page entries ] ^
... ... ... linear virtual FB
[ tile n ] -> [ 64KB ] <- [ 16x 4KB page entries ] v
The GBE hardware is then told that the buffer is 512*tweaked_height,
with tweaked_height = real_width*real_height/pixels_per_tile.
Thus the GBE hardware will scan the first tile, filing the first 64k
covered region of the screen, and then will proceed to the next
tile, until the whole screen is covered.
Here is what would happen at 640x480 8bit:
normal tiling linear
^ 11111111111111112222 11111111111111111111 ^
128 11111111111111112222 11111111111111111111 102 lines
11111111111111112222 11111111111111111111 v
V 11111111111111112222 11111111222222222222
33333333333333334444 22222222222222222222
33333333333333334444 22222222222222222222
< 512 > < 256 > 102*640+256 = 64k
NOTE: The only mode for which this is not working is 800x600 8bit,
as 800*600/512 = 937.5 which is not integer and thus causes
flickering.
I guess this is not so important as one can use 640x480 8bit or
800x600 16bit anyway.
*/
/* Tell gbe about the tiles table location */
/* tile_ptr -> [ tile 1 ] -> FB mem */
/* [ tile 2 ] -> FB mem */
/* ... */
val = 0;
SET_GBE_FIELD(FRM_CONTROL, FRM_TILE_PTR, val, gbe_tiles.dma >> 9);
SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 0); /* do not start */
SET_GBE_FIELD(FRM_CONTROL, FRM_LINEAR, val, 0);
gbe->frm_control = val;
maxPixelsPerTileX = 512 / bytesPerPixel;
wholeTilesX = 1;
partTilesX = 0;
/* Initialize the framebuffer */
val = 0;
SET_GBE_FIELD(FRM_SIZE_TILE, FRM_WIDTH_TILE, val, wholeTilesX);
SET_GBE_FIELD(FRM_SIZE_TILE, FRM_RHS, val, partTilesX);
switch (bytesPerPixel) {
case 1:
SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val,
GBE_FRM_DEPTH_8);
break;
case 2:
SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val,
GBE_FRM_DEPTH_16);
break;
case 4:
SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val,
GBE_FRM_DEPTH_32);
break;
}
gbe->frm_size_tile = val;
/* compute tweaked height */
height_pix = xpmax * ypmax / maxPixelsPerTileX;
val = 0;
SET_GBE_FIELD(FRM_SIZE_PIXEL, FB_HEIGHT_PIX, val, height_pix);
gbe->frm_size_pixel = val;
/* turn off DID and overlay DMA */
gbe->did_control = 0;
gbe->ovr_width_tile = 0;
/* Turn off mouse cursor */
gbe->crs_ctl = 0;
/* Turn on GBE */
gbe_turn_on();
/* Initialize the gamma map */
udelay(10);
for (i = 0; i < 256; i++)
gbe->gmap[i] = (i << 24) | (i << 16) | (i << 8);
/* Initialize the color map */
for (i = 0; i < 256; i++)
gbe_cmap[i] = (i << 8) | (i << 16) | (i << 24);
gbe_loadcmap();
return 0;
}
static void gbefb_encode_fix(struct fb_fix_screeninfo *fix,
struct fb_var_screeninfo *var)
{
memset(fix, 0, sizeof(struct fb_fix_screeninfo));
strcpy(fix->id, "SGI GBE");
fix->smem_start = (unsigned long) gbe_mem;
fix->smem_len = gbe_mem_size;
fix->type = FB_TYPE_PACKED_PIXELS;
fix->type_aux = 0;
fix->accel = FB_ACCEL_NONE;
switch (var->bits_per_pixel) {
case 8:
fix->visual = FB_VISUAL_PSEUDOCOLOR;
break;
default:
fix->visual = FB_VISUAL_TRUECOLOR;
break;
}
fix->ywrapstep = 0;
fix->xpanstep = 0;
fix->ypanstep = 0;
fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
fix->mmio_start = GBE_BASE;
fix->mmio_len = sizeof(struct sgi_gbe);
}
/*
* 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.
*/
static int gbefb_setcolreg(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp,
struct fb_info *info)
{
int i;
if (regno > 255)
return 1;
red >>= 8;
green >>= 8;
blue >>= 8;
if (info->var.bits_per_pixel <= 8) {
gbe_cmap[regno] = (red << 24) | (green << 16) | (blue << 8);
if (gbe_turned_on) {
/* wait for the color map FIFO to have a free entry */
for (i = 0; i < 1000 && gbe->cm_fifo >= 63; i++)
udelay(10);
if (i == 1000) {
printk(KERN_ERR "gbefb: cmap FIFO timeout\n");
return 1;
}
gbe->cmap[regno] = gbe_cmap[regno];
}
} else if (regno < 16) {
switch (info->var.bits_per_pixel) {
case 15:
case 16:
red >>= 3;
green >>= 3;
blue >>= 3;
pseudo_palette[regno] =
(red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
break;
case 32:
pseudo_palette[regno] =
(red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
break;
}
}
return 0;
}
/*
* Check video mode validity, eventually modify var to best match.
*/
static int gbefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
unsigned int line_length;
struct gbe_timing_info timing;
int ret;
/* Limit bpp to 8, 16, and 32 */
if (var->bits_per_pixel <= 8)
var->bits_per_pixel = 8;
else if (var->bits_per_pixel <= 16)
var->bits_per_pixel = 16;
else if (var->bits_per_pixel <= 32)
var->bits_per_pixel = 32;
else
return -EINVAL;
/* Check the mode can be mapped linearly with the tile table trick. */
/* This requires width x height x bytes/pixel be a multiple of 512 */
if ((var->xres * var->yres * var->bits_per_pixel) & 4095)
return -EINVAL;
var->grayscale = 0; /* No grayscale for now */
ret = compute_gbe_timing(var, &timing);
var->pixclock = ret;
if (ret < 0)
return -EINVAL;
/* Adjust virtual resolution, if necessary */
if (var->xres > var->xres_virtual || (!ywrap && !ypan))
var->xres_virtual = var->xres;
if (var->yres > var->yres_virtual || (!ywrap && !ypan))
var->yres_virtual = var->yres;
if (var->vmode & FB_VMODE_CONUPDATE) {
var->vmode |= FB_VMODE_YWRAP;
var->xoffset = info->var.xoffset;
var->yoffset = info->var.yoffset;
}
/* No grayscale for now */
var->grayscale = 0;
/* Memory limit */
line_length = var->xres_virtual * var->bits_per_pixel / 8;
if (line_length * var->yres_virtual > gbe_mem_size)
return -ENOMEM; /* Virtual resolution too high */
switch (var->bits_per_pixel) {
case 8:
var->red.offset = 0;
var->red.length = 8;
var->green.offset = 0;
var->green.length = 8;
var->blue.offset = 0;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 16: /* RGB 1555 */
var->red.offset = 10;
var->red.length = 5;
var->green.offset = 5;
var->green.length = 5;
var->blue.offset = 0;
var->blue.length = 5;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 32: /* RGB 8888 */
var->red.offset = 24;
var->red.length = 8;
var->green.offset = 16;
var->green.length = 8;
var->blue.offset = 8;
var->blue.length = 8;
var->transp.offset = 0;
var->transp.length = 8;
break;
}
var->red.msb_right = 0;
var->green.msb_right = 0;
var->blue.msb_right = 0;
var->transp.msb_right = 0;
var->left_margin = timing.htotal - timing.hsync_end;
var->right_margin = timing.hsync_start - timing.width;
var->upper_margin = timing.vtotal - timing.vsync_end;
var->lower_margin = timing.vsync_start - timing.height;