drivers/video/geode/video_gx.c

   1 /*
   2  * Geode GX video processor device.
   3  *
   4  *   Copyright (C) 2006 Arcom Control Systems Ltd.
   5  *
   6  *   Portions from AMD's original 2.4 driver:
   7  *     Copyright (C) 2004 Advanced Micro Devices, Inc.
   8  *
   9  *   This program is free software; you can redistribute it and/or modify it
  10  *   under the terms of the GNU General Public License as published by the
  11  *   Free Software Foundation; either version 2 of the License, or (at your
  12  *   option) any later version.
  13  */
  14 #include <linux/fb.h>
  15 #include <linux/delay.h>
  16 #include <asm/io.h>
  17 #include <asm/delay.h>
  18 #include <asm/msr.h>
  19
  20 #include "geodefb.h"
  21 #include "video_gx.h"
  22
  23
  24 /*
  25  * Tables of register settings for various DOTCLKs.
  26  */
  27 struct gx_pll_entry {
  28         long pixclock; /* ps */
  29         u32 sys_rstpll_bits;
  30         u32 dotpll_value;
  31 };
  32
  33 #define POSTDIV3 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3)
  34 #define PREMULT2 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPREMULT2)
  35 #define PREDIV2  ((u32)MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3)
  36
  37 static const struct gx_pll_entry gx_pll_table_48MHz[] = {
  38         { 40123, POSTDIV3,          0x00000BF2 },       /*  24.9230 */
  39         { 39721, 0,                 0x00000037 },       /*  25.1750 */
  40         { 35308, POSTDIV3|PREMULT2, 0x00000B1A },       /*  28.3220 */
  41         { 31746, POSTDIV3,          0x000002D2 },       /*  31.5000 */
  42         { 27777, POSTDIV3|PREMULT2, 0x00000FE2 },       /*  36.0000 */
  43         { 26666, POSTDIV3,          0x0000057A },       /*  37.5000 */
  44         { 25000, POSTDIV3,          0x0000030A },       /*  40.0000 */
  45         { 22271, 0,                 0x00000063 },       /*  44.9000 */
  46         { 20202, 0,                 0x0000054B },       /*  49.5000 */
  47         { 20000, 0,                 0x0000026E },       /*  50.0000 */
  48         { 19860, PREMULT2,          0x00000037 },       /*  50.3500 */
  49         { 18518, POSTDIV3|PREMULT2, 0x00000B0D },       /*  54.0000 */
  50         { 17777, 0,                 0x00000577 },       /*  56.2500 */
  51         { 17733, 0,                 0x000007F7 },       /*  56.3916 */
  52         { 17653, 0,                 0x0000057B },       /*  56.6444 */
  53         { 16949, PREMULT2,          0x00000707 },       /*  59.0000 */
  54         { 15873, POSTDIV3|PREMULT2, 0x00000B39 },       /*  63.0000 */
  55         { 15384, POSTDIV3|PREMULT2, 0x00000B45 },       /*  65.0000 */
  56         { 14814, POSTDIV3|PREMULT2, 0x00000FC1 },       /*  67.5000 */
  57         { 14124, POSTDIV3,          0x00000561 },       /*  70.8000 */
  58         { 13888, POSTDIV3,          0x000007E1 },       /*  72.0000 */
  59         { 13426, PREMULT2,          0x00000F4A },       /*  74.4810 */
  60         { 13333, 0,                 0x00000052 },       /*  75.0000 */
  61         { 12698, 0,                 0x00000056 },       /*  78.7500 */
  62         { 12500, POSTDIV3|PREMULT2, 0x00000709 },       /*  80.0000 */
  63         { 11135, PREMULT2,          0x00000262 },       /*  89.8000 */
  64         { 10582, 0,                 0x000002D2 },       /*  94.5000 */
  65         { 10101, PREMULT2,          0x00000B4A },       /*  99.0000 */
  66         { 10000, PREMULT2,          0x00000036 },       /* 100.0000 */
  67         {  9259, 0,                 0x000007E2 },       /* 108.0000 */
  68         {  8888, 0,                 0x000007F6 },       /* 112.5000 */
  69         {  7692, POSTDIV3|PREMULT2, 0x00000FB0 },       /* 130.0000 */
  70         {  7407, POSTDIV3|PREMULT2, 0x00000B50 },       /* 135.0000 */
  71         {  6349, 0,                 0x00000055 },       /* 157.5000 */
  72         {  6172, 0,                 0x000009C1 },       /* 162.0000 */
  73         {  5787, PREMULT2,          0x0000002D },       /* 172.798  */
  74         {  5698, 0,                 0x000002C1 },       /* 175.5000 */
  75         {  5291, 0,                 0x000002D1 },       /* 189.0000 */
  76         {  4938, 0,                 0x00000551 },       /* 202.5000 */
  77         {  4357, 0,                 0x0000057D },       /* 229.5000 */
  78 };
  79
  80 static const struct gx_pll_entry gx_pll_table_14MHz[] = {
  81         { 39721, 0, 0x00000037 },       /*  25.1750 */
  82         { 35308, 0, 0x00000B7B },       /*  28.3220 */
  83         { 31746, 0, 0x000004D3 },       /*  31.5000 */
  84         { 27777, 0, 0x00000BE3 },       /*  36.0000 */
  85         { 26666, 0, 0x0000074F },       /*  37.5000 */
  86         { 25000, 0, 0x0000050B },       /*  40.0000 */
  87         { 22271, 0, 0x00000063 },       /*  44.9000 */
  88         { 20202, 0, 0x0000054B },       /*  49.5000 */
  89         { 20000, 0, 0x0000026E },       /*  50.0000 */
  90         { 19860, 0, 0x000007C3 },       /*  50.3500 */
  91         { 18518, 0, 0x000007E3 },       /*  54.0000 */
  92         { 17777, 0, 0x00000577 },       /*  56.2500 */
  93         { 17733, 0, 0x000002FB },       /*  56.3916 */
  94         { 17653, 0, 0x0000057B },       /*  56.6444 */
  95         { 16949, 0, 0x0000058B },       /*  59.0000 */
  96         { 15873, 0, 0x0000095E },       /*  63.0000 */
  97         { 15384, 0, 0x0000096A },       /*  65.0000 */
  98         { 14814, 0, 0x00000BC2 },       /*  67.5000 */
  99         { 14124, 0, 0x0000098A },       /*  70.8000 */
 100         { 13888, 0, 0x00000BE2 },       /*  72.0000 */
 101         { 13333, 0, 0x00000052 },       /*  75.0000 */
 102         { 12698, 0, 0x00000056 },       /*  78.7500 */
 103         { 12500, 0, 0x0000050A },       /*  80.0000 */
 104         { 11135, 0, 0x0000078E },       /*  89.8000 */
 105         { 10582, 0, 0x000002D2 },       /*  94.5000 */
 106         { 10101, 0, 0x000011F6 },       /*  99.0000 */
 107         { 10000, 0, 0x0000054E },       /* 100.0000 */
 108         {  9259, 0, 0x000007E2 },       /* 108.0000 */
 109         {  8888, 0, 0x000002FA },       /* 112.5000 */
 110         {  7692, 0, 0x00000BB1 },       /* 130.0000 */
 111         {  7407, 0, 0x00000975 },       /* 135.0000 */
 112         {  6349, 0, 0x00000055 },       /* 157.5000 */
 113         {  6172, 0, 0x000009C1 },       /* 162.0000 */
 114         {  5698, 0, 0x000002C1 },       /* 175.5000 */
 115         {  5291, 0, 0x00000539 },       /* 189.0000 */
 116         {  4938, 0, 0x00000551 },       /* 202.5000 */
 117         {  4357, 0, 0x0000057D },       /* 229.5000 */
 118 };
 119
 120 static void gx_set_dclk_frequency(struct fb_info *info)
 121 {
 122         const struct gx_pll_entry *pll_table;
 123         int pll_table_len;
 124         int i, best_i;
 125         long min, diff;
 126         u64 dotpll, sys_rstpll;
 127         int timeout = 1000;
 128
 129         /* Rev. 1 Geode GXs use a 14 MHz reference clock instead of 48 MHz. */
 130         if (cpu_data->x86_mask == 1) {
 131                 pll_table = gx_pll_table_14MHz;
 132                 pll_table_len = ARRAY_SIZE(gx_pll_table_14MHz);
 133         } else {
 134                 pll_table = gx_pll_table_48MHz;
 135                 pll_table_len = ARRAY_SIZE(gx_pll_table_48MHz);
 136         }
 137
 138         /* Search the table for the closest pixclock. */
 139         best_i = 0;
 140         min = abs(pll_table[0].pixclock - info->var.pixclock);
 141         for (i = 1; i < pll_table_len; i++) {
 142                 diff = abs(pll_table[i].pixclock - info->var.pixclock);
 143                 if (diff < min) {
 144                         min = diff;
 145                         best_i = i;
 146                 }
 147         }
 148
 149         rdmsrl(MSR_GLCP_SYS_RSTPLL, sys_rstpll);
 150         rdmsrl(MSR_GLCP_DOTPLL, dotpll);
 151
 152         /* Program new M, N and P. */
 153         dotpll &= 0x00000000ffffffffull;
 154         dotpll |= (u64)pll_table[best_i].dotpll_value << 32;
 155         dotpll |= MSR_GLCP_DOTPLL_DOTRESET;
 156         dotpll &= ~MSR_GLCP_DOTPLL_BYPASS;
 157
 158         wrmsrl(MSR_GLCP_DOTPLL, dotpll);
 159
 160         /* Program dividers. */
 161         sys_rstpll &= ~( MSR_GLCP_SYS_RSTPLL_DOTPREDIV2
 162                          | MSR_GLCP_SYS_RSTPLL_DOTPREMULT2
 163                          | MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3 );
 164         sys_rstpll |= pll_table[best_i].sys_rstpll_bits;
 165
 166         wrmsrl(MSR_GLCP_SYS_RSTPLL, sys_rstpll);
 167
 168         /* Clear reset bit to start PLL. */
 169         dotpll &= ~(MSR_GLCP_DOTPLL_DOTRESET);
 170         wrmsrl(MSR_GLCP_DOTPLL, dotpll);
 171
 172         /* Wait for LOCK bit. */
 173         do {
 174                 rdmsrl(MSR_GLCP_DOTPLL, dotpll);
 175         } while (timeout-- && !(dotpll & MSR_GLCP_DOTPLL_LOCK));
 176 }
 177
 178 static void gx_configure_display(struct fb_info *info)
 179 {
 180         struct geodefb_par *par = info->par;
 181         u32 dcfg, fp_pm;
 182
 183         dcfg = readl(par->vid_regs + GX_DCFG);
 184
 185         /* Clear bits from existing mode. */
 186         dcfg &= ~(GX_DCFG_CRT_SYNC_SKW_MASK
 187                   | GX_DCFG_CRT_HSYNC_POL   | GX_DCFG_CRT_VSYNC_POL
 188                   | GX_DCFG_VSYNC_EN        | GX_DCFG_HSYNC_EN);
 189
 190         /* Set default sync skew.  */
 191         dcfg |= GX_DCFG_CRT_SYNC_SKW_DFLT;
 192
 193         /* Enable hsync and vsync. */
 194         dcfg |= GX_DCFG_HSYNC_EN | GX_DCFG_VSYNC_EN;
 195
 196         /* Sync polarities. */
 197         if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
 198                 dcfg |= GX_DCFG_CRT_HSYNC_POL;
 199         if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
 200                 dcfg |= GX_DCFG_CRT_VSYNC_POL;
 201
 202         writel(dcfg, par->vid_regs + GX_DCFG);
 203
 204         /* Power on flat panel. */
 205         fp_pm = readl(par->vid_regs + GX_FP_PM);
 206         fp_pm |= GX_FP_PM_P;
 207         writel(fp_pm, par->vid_regs + GX_FP_PM);
 208 }
 209
 210 static int gx_blank_display(struct fb_info *info, int blank_mode)
 211 {
 212         struct geodefb_par *par = info->par;
 213         u32 dcfg, fp_pm;
 214         int blank, hsync, vsync;
 215
 216         /* CRT power saving modes. */
 217         switch (blank_mode) {
 218         case FB_BLANK_UNBLANK:
 219                 blank = 0; hsync = 1; vsync = 1;
 220                 break;
 221         case FB_BLANK_NORMAL:
 222                 blank = 1; hsync = 1; vsync = 1;
 223                 break;
 224         case FB_BLANK_VSYNC_SUSPEND:
 225                 blank = 1; hsync = 1; vsync = 0;
 226                 break;
 227         case FB_BLANK_HSYNC_SUSPEND:
 228                 blank = 1; hsync = 0; vsync = 1;
 229                 break;
 230         case FB_BLANK_POWERDOWN:
 231                 blank = 1; hsync = 0; vsync = 0;
 232                 break;
 233         default:
 234                 return -EINVAL;
 235         }
 236         dcfg = readl(par->vid_regs + GX_DCFG);
 237         dcfg &= ~(GX_DCFG_DAC_BL_EN
 238                   | GX_DCFG_HSYNC_EN | GX_DCFG_VSYNC_EN);
 239         if (!blank)
 240                 dcfg |= GX_DCFG_DAC_BL_EN;
 241         if (hsync)
 242                 dcfg |= GX_DCFG_HSYNC_EN;
 243         if (vsync)
 244                 dcfg |= GX_DCFG_VSYNC_EN;
 245         writel(dcfg, par->vid_regs + GX_DCFG);
 246
 247         /* Power on/off flat panel. */
 248         fp_pm = readl(par->vid_regs + GX_FP_PM);
 249         if (blank_mode == FB_BLANK_POWERDOWN)
 250                 fp_pm &= ~GX_FP_PM_P;
 251         else
 252                 fp_pm |= GX_FP_PM_P;
 253         writel(fp_pm, par->vid_regs + GX_FP_PM);
 254
 255         return 0;
 256 }
 257
 258 struct geode_vid_ops gx_vid_ops = {
 259         .set_dclk          = gx_set_dclk_frequency,
 260         .configure_display = gx_configure_display,
 261         .blank_display     = gx_blank_display,
 262 };