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linux/drivers/video/geode/lxfb_ops.c
Jordan Crouse 3968cb49ab lxfb: GEODE: Add framebuffer support for the AMD Geode LX 
Add framebuffer support for the AMD Geode LX graphics engine.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-31 15:39:37 -07:00

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/* Geode LX framebuffer driver
*
* Copyright (C) 2006-2007, Advanced Micro Devices,Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include "lxfb.h"
/* TODO
* Support panel scaling
* Add acceleration
* Add support for interlacing (TV out)
* Support compression
*/
/* This is the complete list of PLL frequencies that we can set -
* we will choose the closest match to the incoming clock.
* freq is the frequency of the dotclock * 1000 (for example,
* 24823 = 24.983 Mhz).
* pllval is the corresponding PLL value
*/
static const struct {
unsigned int pllval;
unsigned int freq;
} pll_table[] = {
{ 0x000031AC, 24923 },
{ 0x0000215D, 25175 },
{ 0x00001087, 27000 },
{ 0x0000216C, 28322 },
{ 0x0000218D, 28560 },
{ 0x000010C9, 31200 },
{ 0x00003147, 31500 },
{ 0x000010A7, 33032 },
{ 0x00002159, 35112 },
{ 0x00004249, 35500 },
{ 0x00000057, 36000 },
{ 0x0000219A, 37889 },
{ 0x00002158, 39168 },
{ 0x00000045, 40000 },
{ 0x00000089, 43163 },
{ 0x000010E7, 44900 },
{ 0x00002136, 45720 },
{ 0x00003207, 49500 },
{ 0x00002187, 50000 },
{ 0x00004286, 56250 },
{ 0x000010E5, 60065 },
{ 0x00004214, 65000 },
{ 0x00001105, 68179 },
{ 0x000031E4, 74250 },
{ 0x00003183, 75000 },
{ 0x00004284, 78750 },
{ 0x00001104, 81600 },
{ 0x00006363, 94500 },
{ 0x00005303, 97520 },
{ 0x00002183, 100187 },
{ 0x00002122, 101420 },
{ 0x00001081, 108000 },
{ 0x00006201, 113310 },
{ 0x00000041, 119650 },
{ 0x000041A1, 129600 },
{ 0x00002182, 133500 },
{ 0x000041B1, 135000 },
{ 0x00000051, 144000 },
{ 0x000041E1, 148500 },
{ 0x000062D1, 157500 },
{ 0x000031A1, 162000 },
{ 0x00000061, 169203 },
{ 0x00004231, 172800 },
{ 0x00002151, 175500 },
{ 0x000052E1, 189000 },
{ 0x00000071, 192000 },
{ 0x00003201, 198000 },
{ 0x00004291, 202500 },
{ 0x00001101, 204750 },
{ 0x00007481, 218250 },
{ 0x00004170, 229500 },
{ 0x00006210, 234000 },
{ 0x00003140, 251182 },
{ 0x00006250, 261000 },
{ 0x000041C0, 278400 },
{ 0x00005220, 280640 },
{ 0x00000050, 288000 },
{ 0x000041E0, 297000 },
{ 0x00002130, 320207 }
};
static void lx_set_dotpll(u32 pllval)
{
u32 dotpll_lo, dotpll_hi;
int i;
rdmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
if ((dotpll_lo & GLCP_DOTPLL_LOCK) && (dotpll_hi == pllval))
return;
dotpll_hi = pllval;
dotpll_lo &= ~(GLCP_DOTPLL_BYPASS | GLCP_DOTPLL_HALFPIX);
dotpll_lo |= GLCP_DOTPLL_RESET;
wrmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
/* Wait 100us for the PLL to lock */
udelay(100);
/* Now, loop for the lock bit */
for (i = 0; i < 1000; i++) {
rdmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
if (dotpll_lo & GLCP_DOTPLL_LOCK)
break;
}
/* Clear the reset bit */
dotpll_lo &= ~GLCP_DOTPLL_RESET;
wrmsr(MSR_LX_GLCP_DOTPLL, dotpll_lo, dotpll_hi);
}
/* Set the clock based on the frequency specified by the current mode */
static void lx_set_clock(struct fb_info *info)
{
unsigned int diff, min, best = 0;
unsigned int freq, i;
freq = (unsigned int) (0x3b9aca00 / info->var.pixclock);
min = abs(pll_table[0].freq - freq);
for (i = 0; i < ARRAY_SIZE(pll_table); i++) {
diff = abs(pll_table[i].freq - freq);
if (diff < min) {
min = diff;
best = i;
}
}
lx_set_dotpll(pll_table[best].pllval & 0x7FFF);
}
static void lx_graphics_disable(struct fb_info *info)
{
struct lxfb_par *par = info->par;
unsigned int val, gcfg;
/* Note: This assumes that the video is in a quitet state */
writel(0, par->df_regs + DF_ALPHA_CONTROL_1);
writel(0, par->df_regs + DF_ALPHA_CONTROL_1 + 32);
writel(0, par->df_regs + DF_ALPHA_CONTROL_1 + 64);
/* Turn off the VGA and video enable */
val = readl (par->dc_regs + DC_GENERAL_CFG) &
~(DC_GCFG_VGAE | DC_GCFG_VIDE);
writel(val, par->dc_regs + DC_GENERAL_CFG);
val = readl(par->df_regs + DF_VIDEO_CFG) & ~DF_VCFG_VID_EN;
writel(val, par->df_regs + DF_VIDEO_CFG);
writel( DC_IRQ_MASK | DC_VSYNC_IRQ_MASK |
DC_IRQ_STATUS | DC_VSYNC_IRQ_STATUS,
par->dc_regs + DC_IRQ);
val = readl(par->dc_regs + DC_GENLCK_CTRL) & ~DC_GENLCK_ENABLE;
writel(val, par->dc_regs + DC_GENLCK_CTRL);
val = readl(par->dc_regs + DC_COLOR_KEY) & ~DC_CLR_KEY_ENABLE;
writel(val & ~DC_CLR_KEY_ENABLE, par->dc_regs + DC_COLOR_KEY);
/* We don't actually blank the panel, due to the long latency
involved with bringing it back */
val = readl(par->df_regs + DF_MISC) | DF_MISC_DAC_PWRDN;
writel(val, par->df_regs + DF_MISC);
/* Turn off the display */
val = readl(par->df_regs + DF_DISPLAY_CFG);
writel(val & ~(DF_DCFG_CRT_EN | DF_DCFG_HSYNC_EN | DF_DCFG_VSYNC_EN |
DF_DCFG_DAC_BL_EN), par->df_regs + DF_DISPLAY_CFG);
gcfg = readl(par->dc_regs + DC_GENERAL_CFG);
gcfg &= ~(DC_GCFG_CMPE | DC_GCFG_DECE);
writel(gcfg, par->dc_regs + DC_GENERAL_CFG);
/* Turn off the TGEN */
val = readl(par->dc_regs + DC_DISPLAY_CFG);
val &= ~DC_DCFG_TGEN;
writel(val, par->dc_regs + DC_DISPLAY_CFG);
/* Wait 1000 usecs to ensure that the TGEN is clear */
udelay(1000);
/* Turn off the FIFO loader */
gcfg &= ~DC_GCFG_DFLE;
writel(gcfg, par->dc_regs + DC_GENERAL_CFG);
/* Lastly, wait for the GP to go idle */
do {
val = readl(par->gp_regs + GP_BLT_STATUS);
} while ((val & GP_BS_BLT_BUSY) || !(val & GP_BS_CB_EMPTY));
}
static void lx_graphics_enable(struct fb_info *info)
{
struct lxfb_par *par = info->par;
u32 temp, config;
/* Set the video request register */
writel(0, par->df_regs + DF_VIDEO_REQUEST);
/* Set up the polarities */
config = readl(par->df_regs + DF_DISPLAY_CFG);
config &= ~(DF_DCFG_CRT_SYNC_SKW_MASK | DF_DCFG_PWR_SEQ_DLY_MASK |
DF_DCFG_CRT_HSYNC_POL | DF_DCFG_CRT_VSYNC_POL);
config |= (DF_DCFG_CRT_SYNC_SKW_INIT | DF_DCFG_PWR_SEQ_DLY_INIT |
DF_DCFG_GV_PAL_BYP);
if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
config |= DF_DCFG_CRT_HSYNC_POL;
if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
config |= DF_DCFG_CRT_VSYNC_POL;
if (par->output & OUTPUT_PANEL) {
u32 msrlo, msrhi;
writel(DF_DEFAULT_TFT_PMTIM1,
par->df_regs + DF_PANEL_TIM1);
writel(DF_DEFAULT_TFT_PMTIM2,
par->df_regs + DF_PANEL_TIM2);
writel(DF_DEFAULT_TFT_DITHCTL,
par->df_regs + DF_DITHER_CONTROL);
msrlo = DF_DEFAULT_TFT_PAD_SEL_LOW;
msrhi = DF_DEFAULT_TFT_PAD_SEL_HIGH;
wrmsr(MSR_LX_DF_PADSEL, msrlo, msrhi);
}
if (par->output & OUTPUT_CRT) {
config |= DF_DCFG_CRT_EN | DF_DCFG_HSYNC_EN |
DF_DCFG_VSYNC_EN | DF_DCFG_DAC_BL_EN;
}
writel(config, par->df_regs + DF_DISPLAY_CFG);
/* Turn the CRT dacs back on */
if (par->output & OUTPUT_CRT) {
temp = readl(par->df_regs + DF_MISC);
temp &= ~(DF_MISC_DAC_PWRDN | DF_MISC_A_PWRDN);
writel(temp, par->df_regs + DF_MISC);
}
/* Turn the panel on (if it isn't already) */
if (par->output & OUTPUT_PANEL) {
temp = readl(par->df_regs + DF_FP_PM);
if (!(temp & 0x09))
writel(temp | DF_FP_PM_P, par->df_regs + DF_FP_PM);
}
temp = readl(par->df_regs + DF_MISC);
temp = readl(par->df_regs + DF_DISPLAY_CFG);
}
unsigned int lx_framebuffer_size(void)
{
unsigned int val;
/* The frame buffer size is reported by a VSM in VSA II */
/* Virtual Register Class = 0x02 */
/* VG_MEM_SIZE (1MB units) = 0x00 */
outw(0xFC53, 0xAC1C);
outw(0x0200, 0xAC1C);
val = (unsigned int)(inw(0xAC1E)) & 0xFE;
return (val << 20);
}
void lx_set_mode(struct fb_info *info)
{
struct lxfb_par *par = info->par;
u64 msrval;
unsigned int max, dv, val, size;
unsigned int gcfg, dcfg;
int hactive, hblankstart, hsyncstart, hsyncend, hblankend, htotal;
int vactive, vblankstart, vsyncstart, vsyncend, vblankend, vtotal;
/* Unlock the DC registers */
writel(DC_UNLOCK_CODE, par->dc_regs + DC_UNLOCK);
lx_graphics_disable(info);
lx_set_clock(info);
/* Set output mode */
rdmsrl(MSR_LX_DF_GLCONFIG, msrval);
msrval &= ~DF_CONFIG_OUTPUT_MASK;
if (par->output & OUTPUT_PANEL) {
msrval |= DF_OUTPUT_PANEL;
if (par->output & OUTPUT_CRT)
msrval |= DF_SIMULTANEOUS_CRT_AND_FP;
else
msrval &= ~DF_SIMULTANEOUS_CRT_AND_FP;
} else {
msrval |= DF_OUTPUT_CRT;
}
wrmsrl(MSR_LX_DF_GLCONFIG, msrval);
/* Clear the various buffers */
/* FIXME: Adjust for panning here */
writel(0, par->dc_regs + DC_FB_START);
writel(0, par->dc_regs + DC_CB_START);
writel(0, par->dc_regs + DC_CURSOR_START);
/* FIXME: Add support for interlacing */
/* FIXME: Add support for scaling */
val = readl(par->dc_regs + DC_GENLCK_CTRL);
val &= ~(DC_GC_ALPHA_FLICK_ENABLE |
DC_GC_FLICKER_FILTER_ENABLE | DC_GC_FLICKER_FILTER_MASK);
/* Default scaling params */
writel((0x4000 << 16) | 0x4000, par->dc_regs + DC_GFX_SCALE);
writel(0, par->dc_regs + DC_IRQ_FILT_CTL);
writel(val, par->dc_regs + DC_GENLCK_CTRL);
/* FIXME: Support compression */
if (info->fix.line_length > 4096)
dv = DC_DV_LINE_SIZE_8192;
else if (info->fix.line_length > 2048)
dv = DC_DV_LINE_SIZE_4096;
else if (info->fix.line_length > 1024)
dv = DC_DV_LINE_SIZE_2048;
else
dv = DC_DV_LINE_SIZE_1024;
max = info->fix.line_length * info->var.yres;
max = (max + 0x3FF) & 0xFFFFFC00;
writel(max | DC_DV_TOP_ENABLE, par->dc_regs + DC_DV_TOP);
val = readl(par->dc_regs + DC_DV_CTL) & ~DC_DV_LINE_SIZE_MASK;
writel(val | dv, par->dc_regs + DC_DV_CTL);
size = info->var.xres * (info->var.bits_per_pixel >> 3);
writel(info->fix.line_length >> 3, par->dc_regs + DC_GRAPHICS_PITCH);
writel((size + 7) >> 3, par->dc_regs + DC_LINE_SIZE);
/* Set default watermark values */
rdmsrl(MSR_LX_DC_SPARE, msrval);
msrval &= ~(DC_SPARE_DISABLE_CFIFO_HGO | DC_SPARE_VFIFO_ARB_SELECT |
DC_SPARE_LOAD_WM_LPEN_MASK | DC_SPARE_WM_LPEN_OVRD |
DC_SPARE_DISABLE_INIT_VID_PRI | DC_SPARE_DISABLE_VFIFO_WM);
msrval |= DC_SPARE_DISABLE_VFIFO_WM | DC_SPARE_DISABLE_INIT_VID_PRI;
wrmsrl(MSR_LX_DC_SPARE, msrval);
gcfg = DC_GCFG_DFLE; /* Display fifo enable */
gcfg |= 0xB600; /* Set default priority */
gcfg |= DC_GCFG_FDTY; /* Set the frame dirty mode */
dcfg = DC_DCFG_VDEN; /* Enable video data */
dcfg |= DC_DCFG_GDEN; /* Enable graphics */
dcfg |= DC_DCFG_TGEN; /* Turn on the timing generator */
dcfg |= DC_DCFG_TRUP; /* Update timings immediately */
dcfg |= DC_DCFG_PALB; /* Palette bypass in > 8 bpp modes */
dcfg |= DC_DCFG_VISL;
dcfg |= DC_DCFG_DCEN; /* Always center the display */
/* Set the current BPP mode */
switch (info->var.bits_per_pixel) {
case 8:
dcfg |= DC_DCFG_DISP_MODE_8BPP;
break;
case 16:
dcfg |= DC_DCFG_DISP_MODE_16BPP | DC_DCFG_16BPP;
break;
case 32:
case 24:
dcfg |= DC_DCFG_DISP_MODE_24BPP;
break;
}
/* Now - set up the timings */
hactive = info->var.xres;
hblankstart = hactive;
hsyncstart = hblankstart + info->var.right_margin;
hsyncend = hsyncstart + info->var.hsync_len;
hblankend = hsyncend + info->var.left_margin;
htotal = hblankend;
vactive = info->var.yres;
vblankstart = vactive;
vsyncstart = vblankstart + info->var.lower_margin;
vsyncend = vsyncstart + info->var.vsync_len;
vblankend = vsyncend + info->var.upper_margin;
vtotal = vblankend;
writel((hactive - 1) | ((htotal - 1) << 16),
par->dc_regs + DC_H_ACTIVE_TIMING);
writel((hblankstart - 1) | ((hblankend - 1) << 16),
par->dc_regs + DC_H_BLANK_TIMING);
writel((hsyncstart - 1) | ((hsyncend - 1) << 16),
par->dc_regs + DC_H_SYNC_TIMING);
writel((vactive - 1) | ((vtotal - 1) << 16),
par->dc_regs + DC_V_ACTIVE_TIMING);
writel((vblankstart - 1) | ((vblankend - 1) << 16),
par->dc_regs + DC_V_BLANK_TIMING);
writel((vsyncstart - 1) | ((vsyncend - 1) << 16),
par->dc_regs + DC_V_SYNC_TIMING);
writel( (info->var.xres - 1) << 16 | (info->var.yres - 1),
par->dc_regs + DC_FB_ACTIVE);
/* And re-enable the graphics output */
lx_graphics_enable(info);
/* Write the two main configuration registers */
writel(dcfg, par->dc_regs + DC_DISPLAY_CFG);
writel(0, par->dc_regs + DC_ARB_CFG);
writel(gcfg, par->dc_regs + DC_GENERAL_CFG);
/* Lock the DC registers */
writel(0, par->dc_regs + DC_UNLOCK);
}
void lx_set_palette_reg(struct fb_info *info, unsigned regno,
unsigned red, unsigned green, unsigned blue)
{
struct lxfb_par *par = info->par;
int val;
/* Hardware palette is in RGB 8-8-8 format. */
val = (red << 8) & 0xff0000;
val |= (green) & 0x00ff00;
val |= (blue >> 8) & 0x0000ff;
writel(regno, par->dc_regs + DC_PAL_ADDRESS);
writel(val, par->dc_regs + DC_PAL_DATA);
}
int lx_blank_display(struct fb_info *info, int blank_mode)
{
struct lxfb_par *par = info->par;
u32 dcfg, fp_pm;
int blank, hsync, vsync;
/* CRT power saving modes. */
switch (blank_mode) {
case FB_BLANK_UNBLANK:
blank = 0; hsync = 1; vsync = 1;
break;
case FB_BLANK_NORMAL:
blank = 1; hsync = 1; vsync = 1;
break;
case FB_BLANK_VSYNC_SUSPEND:
blank = 1; hsync = 1; vsync = 0;
break;
case FB_BLANK_HSYNC_SUSPEND:
blank = 1; hsync = 0; vsync = 1;
break;
case FB_BLANK_POWERDOWN:
blank = 1; hsync = 0; vsync = 0;
break;
default:
return -EINVAL;
}
dcfg = readl(par->df_regs + DF_DISPLAY_CFG);
dcfg &= ~(DF_DCFG_DAC_BL_EN
| DF_DCFG_HSYNC_EN | DF_DCFG_VSYNC_EN);
if (!blank)
dcfg |= DF_DCFG_DAC_BL_EN;
if (hsync)
dcfg |= DF_DCFG_HSYNC_EN;
if (vsync)
dcfg |= DF_DCFG_VSYNC_EN;
writel(dcfg, par->df_regs + DF_DISPLAY_CFG);
/* Power on/off flat panel */
if (par->output & OUTPUT_PANEL) {
fp_pm = readl(par->df_regs + DF_FP_PM);
if (blank_mode == FB_BLANK_POWERDOWN)
fp_pm &= ~DF_FP_PM_P;
else
fp_pm |= DF_FP_PM_P;
writel(fp_pm, par->df_regs + DF_FP_PM);
}
return 0;
}
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