// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Geode GX video processor device.
*
* Copyright (C) 2006 Arcom Control Systems Ltd.
*
* Portions from AMD's original 2.4 driver:
* Copyright (C) 2004 Advanced Micro Devices, Inc.
*/
#include <linux/fb.h>
#include <linux/delay.h>
#include <asm /io.h>
#include <asm /delay.h>
#include <asm /msr.h>
#include <linux/cs5535.h>
#include "gxfb.h"
/*
* Tables of register settings for various DOTCLKs.
*/
struct gx_pll_entry {
long pixclock; /* ps */
u32 sys_rstpll_bits;
u32 dotpll_value;
};
#define POSTDIV3 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3)
#define PREMULT2 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPREMULT2)
#define PREDIV2 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3)
static const struct gx_pll_entry gx_pll_table_48MHz[] = {
{ 40123 , POSTDIV3, 0 x00000BF2 }, /* 24.9230 */
{ 39721 , 0 , 0 x00000037 }, /* 25.1750 */
{ 35308 , POSTDIV3|PREMULT2, 0 x00000B1A }, /* 28.3220 */
{ 31746 , POSTDIV3, 0 x000002D2 }, /* 31.5000 */
{ 27777 , POSTDIV3|PREMULT2, 0 x00000FE2 }, /* 36.0000 */
{ 26666 , POSTDIV3, 0 x0000057A }, /* 37.5000 */
{ 25000 , POSTDIV3, 0 x0000030A }, /* 40.0000 */
{ 22271 , 0 , 0 x00000063 }, /* 44.9000 */
{ 20202 , 0 , 0 x0000054B }, /* 49.5000 */
{ 20000 , 0 , 0 x0000026E }, /* 50.0000 */
{ 19860 , PREMULT2, 0 x00000037 }, /* 50.3500 */
{ 18518 , POSTDIV3|PREMULT2, 0 x00000B0D }, /* 54.0000 */
{ 17777 , 0 , 0 x00000577 }, /* 56.2500 */
{ 17733 , 0 , 0 x000007F7 }, /* 56.3916 */
{ 17653 , 0 , 0 x0000057B }, /* 56.6444 */
{ 16949 , PREMULT2, 0 x00000707 }, /* 59.0000 */
{ 15873 , POSTDIV3|PREMULT2, 0 x00000B39 }, /* 63.0000 */
{ 15384 , POSTDIV3|PREMULT2, 0 x00000B45 }, /* 65.0000 */
{ 14814 , POSTDIV3|PREMULT2, 0 x00000FC1 }, /* 67.5000 */
{ 14124 , POSTDIV3, 0 x00000561 }, /* 70.8000 */
{ 13888 , POSTDIV3, 0 x000007E1 }, /* 72.0000 */
{ 13426 , PREMULT2, 0 x00000F4A }, /* 74.4810 */
{ 13333 , 0 , 0 x00000052 }, /* 75.0000 */
{ 12698 , 0 , 0 x00000056 }, /* 78.7500 */
{ 12500 , POSTDIV3|PREMULT2, 0 x00000709 }, /* 80.0000 */
{ 11135 , PREMULT2, 0 x00000262 }, /* 89.8000 */
{ 10582 , 0 , 0 x000002D2 }, /* 94.5000 */
{ 10101 , PREMULT2, 0 x00000B4A }, /* 99.0000 */
{ 10000 , PREMULT2, 0 x00000036 }, /* 100.0000 */
{ 9259 , 0 , 0 x000007E2 }, /* 108.0000 */
{ 8888 , 0 , 0 x000007F6 }, /* 112.5000 */
{ 7692 , POSTDIV3|PREMULT2, 0 x00000FB0 }, /* 130.0000 */
{ 7407 , POSTDIV3|PREMULT2, 0 x00000B50 }, /* 135.0000 */
{ 6349 , 0 , 0 x00000055 }, /* 157.5000 */
{ 6172 , 0 , 0 x000009C1 }, /* 162.0000 */
{ 5787 , PREMULT2, 0 x0000002D }, /* 172.798 */
{ 5698 , 0 , 0 x000002C1 }, /* 175.5000 */
{ 5291 , 0 , 0 x000002D1 }, /* 189.0000 */
{ 4938 , 0 , 0 x00000551 }, /* 202.5000 */
{ 4357 , 0 , 0 x0000057D }, /* 229.5000 */
};
static const struct gx_pll_entry gx_pll_table_14MHz[] = {
{ 39721 , 0 , 0 x00000037 }, /* 25.1750 */
{ 35308 , 0 , 0 x00000B7B }, /* 28.3220 */
{ 31746 , 0 , 0 x000004D3 }, /* 31.5000 */
{ 27777 , 0 , 0 x00000BE3 }, /* 36.0000 */
{ 26666 , 0 , 0 x0000074F }, /* 37.5000 */
{ 25000 , 0 , 0 x0000050B }, /* 40.0000 */
{ 22271 , 0 , 0 x00000063 }, /* 44.9000 */
{ 20202 , 0 , 0 x0000054B }, /* 49.5000 */
{ 20000 , 0 , 0 x0000026E }, /* 50.0000 */
{ 19860 , 0 , 0 x000007C3 }, /* 50.3500 */
{ 18518 , 0 , 0 x000007E3 }, /* 54.0000 */
{ 17777 , 0 , 0 x00000577 }, /* 56.2500 */
{ 17733 , 0 , 0 x000002FB }, /* 56.3916 */
{ 17653 , 0 , 0 x0000057B }, /* 56.6444 */
{ 16949 , 0 , 0 x0000058B }, /* 59.0000 */
{ 15873 , 0 , 0 x0000095E }, /* 63.0000 */
{ 15384 , 0 , 0 x0000096A }, /* 65.0000 */
{ 14814 , 0 , 0 x00000BC2 }, /* 67.5000 */
{ 14124 , 0 , 0 x0000098A }, /* 70.8000 */
{ 13888 , 0 , 0 x00000BE2 }, /* 72.0000 */
{ 13333 , 0 , 0 x00000052 }, /* 75.0000 */
{ 12698 , 0 , 0 x00000056 }, /* 78.7500 */
{ 12500 , 0 , 0 x0000050A }, /* 80.0000 */
{ 11135 , 0 , 0 x0000078E }, /* 89.8000 */
{ 10582 , 0 , 0 x000002D2 }, /* 94.5000 */
{ 10101 , 0 , 0 x000011F6 }, /* 99.0000 */
{ 10000 , 0 , 0 x0000054E }, /* 100.0000 */
{ 9259 , 0 , 0 x000007E2 }, /* 108.0000 */
{ 8888 , 0 , 0 x000002FA }, /* 112.5000 */
{ 7692 , 0 , 0 x00000BB1 }, /* 130.0000 */
{ 7407 , 0 , 0 x00000975 }, /* 135.0000 */
{ 6349 , 0 , 0 x00000055 }, /* 157.5000 */
{ 6172 , 0 , 0 x000009C1 }, /* 162.0000 */
{ 5698 , 0 , 0 x000002C1 }, /* 175.5000 */
{ 5291 , 0 , 0 x00000539 }, /* 189.0000 */
{ 4938 , 0 , 0 x00000551 }, /* 202.5000 */
{ 4357 , 0 , 0 x0000057D }, /* 229.5000 */
};
void gx_set_dclk_frequency(struct fb_info *info)
{
const struct gx_pll_entry *pll_table;
int pll_table_len;
int i, best_i;
long min, diff;
u64 dotpll, sys_rstpll;
int timeout = 1000 ;
/* Rev. 1 Geode GXs use a 14 MHz reference clock instead of 48 MHz. */
if (cpu_data(0 ).x86_stepping == 1 ) {
pll_table = gx_pll_table_14MHz;
pll_table_len = ARRAY_SIZE(gx_pll_table_14MHz);
} else {
pll_table = gx_pll_table_48MHz;
pll_table_len = ARRAY_SIZE(gx_pll_table_48MHz);
}
/* Search the table for the closest pixclock. */
best_i = 0 ;
min = abs(pll_table[0 ].pixclock - info->var.pixclock);
for (i = 1 ; i < pll_table_len; i++) {
diff = abs(pll_table[i].pixclock - info->var.pixclock);
if (diff < min) {
min = diff;
best_i = i;
}
}
rdmsrq(MSR_GLCP_SYS_RSTPLL, sys_rstpll);
rdmsrq(MSR_GLCP_DOTPLL, dotpll);
/* Program new M, N and P. */
dotpll &= 0 x00000000ffffffffull;
dotpll |= (u64)pll_table[best_i].dotpll_value << 32 ;
dotpll |= MSR_GLCP_DOTPLL_DOTRESET;
dotpll &= ~MSR_GLCP_DOTPLL_BYPASS;
wrmsrq(MSR_GLCP_DOTPLL, dotpll);
/* Program dividers. */
sys_rstpll &= ~( MSR_GLCP_SYS_RSTPLL_DOTPREDIV2
| MSR_GLCP_SYS_RSTPLL_DOTPREMULT2
| MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3 );
sys_rstpll |= pll_table[best_i].sys_rstpll_bits;
wrmsrq(MSR_GLCP_SYS_RSTPLL, sys_rstpll);
/* Clear reset bit to start PLL. */
dotpll &= ~(MSR_GLCP_DOTPLL_DOTRESET);
wrmsrq(MSR_GLCP_DOTPLL, dotpll);
/* Wait for LOCK bit. */
do {
rdmsrq(MSR_GLCP_DOTPLL, dotpll);
} while (timeout-- && !(dotpll & MSR_GLCP_DOTPLL_LOCK));
}
static void
gx_configure_tft(struct fb_info *info)
{
struct gxfb_par *par = info->par;
unsigned long val;
unsigned long fp;
/* Set up the DF pad select MSR */
rdmsrq(MSR_GX_MSR_PADSEL, val);
val &= ~MSR_GX_MSR_PADSEL_MASK;
val |= MSR_GX_MSR_PADSEL_TFT;
wrmsrq(MSR_GX_MSR_PADSEL, val);
/* Turn off the panel */
fp = read_fp(par, FP_PM);
fp &= ~FP_PM_P;
write_fp(par, FP_PM, fp);
/* Set timing 1 */
fp = read_fp(par, FP_PT1);
fp &= FP_PT1_VSIZE_MASK;
fp |= info->var.yres << FP_PT1_VSIZE_SHIFT;
write_fp(par, FP_PT1, fp);
/* Timing 2 */
/* Set bits that are always on for TFT */
fp = 0 x0F100000;
/* Configure sync polarity */
if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
fp |= FP_PT2_VSP;
if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
fp |= FP_PT2_HSP;
write_fp(par, FP_PT2, fp);
/* Set the dither control */
write_fp(par, FP_DFC, FP_DFC_NFI);
/* Enable the FP data and power (in case the BIOS didn't) */
fp = read_vp(par, VP_DCFG);
fp |= VP_DCFG_FP_PWR_EN | VP_DCFG_FP_DATA_EN;
write_vp(par, VP_DCFG, fp);
/* Unblank the panel */
fp = read_fp(par, FP_PM);
fp |= FP_PM_P;
write_fp(par, FP_PM, fp);
}
void gx_configure_display(struct fb_info *info)
{
struct gxfb_par *par = info->par;
u32 dcfg, misc;
/* Write the display configuration */
dcfg = read_vp(par, VP_DCFG);
/* Disable hsync and vsync */
dcfg &= ~(VP_DCFG_VSYNC_EN | VP_DCFG_HSYNC_EN);
write_vp(par, VP_DCFG, dcfg);
/* Clear bits from existing mode. */
dcfg &= ~(VP_DCFG_CRT_SYNC_SKW
| VP_DCFG_CRT_HSYNC_POL | VP_DCFG_CRT_VSYNC_POL
| VP_DCFG_VSYNC_EN | VP_DCFG_HSYNC_EN);
/* Set default sync skew. */
dcfg |= VP_DCFG_CRT_SYNC_SKW_DEFAULT;
/* Enable hsync and vsync. */
dcfg |= VP_DCFG_HSYNC_EN | VP_DCFG_VSYNC_EN;
misc = read_vp(par, VP_MISC);
/* Disable gamma correction */
misc |= VP_MISC_GAM_EN;
if (par->enable_crt) {
/* Power up the CRT DACs */
misc &= ~(VP_MISC_APWRDN | VP_MISC_DACPWRDN);
write_vp(par, VP_MISC, misc);
/* Only change the sync polarities if we are running
* in CRT mode. The FP polarities will be handled in
* gxfb_configure_tft */
if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
dcfg |= VP_DCFG_CRT_HSYNC_POL;
if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
dcfg |= VP_DCFG_CRT_VSYNC_POL;
} else {
/* Power down the CRT DACs if in FP mode */
misc |= (VP_MISC_APWRDN | VP_MISC_DACPWRDN);
write_vp(par, VP_MISC, misc);
}
/* Enable the display logic */
/* Set up the DACS to blank normally */
dcfg |= VP_DCFG_CRT_EN | VP_DCFG_DAC_BL_EN;
/* Enable the external DAC VREF? */
write_vp(par, VP_DCFG, dcfg);
/* Set up the flat panel (if it is enabled) */
if (par->enable_crt == 0 )
gx_configure_tft(info);
}
int gx_blank_display(struct fb_info *info, int blank_mode)
{
struct gxfb_par *par = info->par;
u32 dcfg, fp_pm;
int blank, hsync, vsync, crt;
/* CRT power saving modes. */
switch (blank_mode) {
case FB_BLANK_UNBLANK:
blank = 0 ; hsync = 1 ; vsync = 1 ; crt = 1 ;
break ;
case FB_BLANK_NORMAL:
blank = 1 ; hsync = 1 ; vsync = 1 ; crt = 1 ;
break ;
case FB_BLANK_VSYNC_SUSPEND:
blank = 1 ; hsync = 1 ; vsync = 0 ; crt = 1 ;
break ;
case FB_BLANK_HSYNC_SUSPEND:
blank = 1 ; hsync = 0 ; vsync = 1 ; crt = 1 ;
break ;
case FB_BLANK_POWERDOWN:
blank = 1 ; hsync = 0 ; vsync = 0 ; crt = 0 ;
break ;
default :
return -EINVAL;
}
dcfg = read_vp(par, VP_DCFG);
dcfg &= ~(VP_DCFG_DAC_BL_EN | VP_DCFG_HSYNC_EN | VP_DCFG_VSYNC_EN |
VP_DCFG_CRT_EN);
if (!blank)
dcfg |= VP_DCFG_DAC_BL_EN;
if (hsync)
dcfg |= VP_DCFG_HSYNC_EN;
if (vsync)
dcfg |= VP_DCFG_VSYNC_EN;
if (crt)
dcfg |= VP_DCFG_CRT_EN;
write_vp(par, VP_DCFG, dcfg);
/* Power on/off flat panel. */
if (par->enable_crt == 0 ) {
fp_pm = read_fp(par, FP_PM);
if (blank_mode == FB_BLANK_POWERDOWN)
fp_pm &= ~FP_PM_P;
else
fp_pm |= FP_PM_P;
write_fp(par, FP_PM, fp_pm);
}
return 0 ;
}
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