LXR linux/drivers/video/geode/video

   1/*
   2 * drivers/video/geode/video_cs5530.c
   3 *   -- CS5530 video device
   4 *
   5 * Copyright (C) 2005 Arcom Control Systems Ltd.
   6 *
   7 * Based on AMD's original 2.4 driver:
   8 *   Copyright (C) 2004 Advanced Micro Devices, Inc.
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 */
  15#include <linux/fb.h>
  16#include <linux/delay.h>
  17#include <asm/io.h>
  18#include <asm/delay.h>
  19
  20#include "geodefb.h"
  21#include "video_cs5530.h"
  22
  23/*
  24 * CS5530 PLL table. This maps pixclocks to the appropriate PLL register
  25 * value.
  26 */
  27struct cs5530_pll_entry {
  28        long pixclock; /* ps */
  29        u32 pll_value;
  30};
  31
  32static const struct cs5530_pll_entry cs5530_pll_table[] = {
  33        { 39721, 0x31C45801, }, /*  25.1750 MHz */
  34        { 35308, 0x20E36802, }, /*  28.3220 */
  35        { 31746, 0x33915801, }, /*  31.5000 */
  36        { 27777, 0x31EC4801, }, /*  36.0000 */
  37        { 26666, 0x21E22801, }, /*  37.5000 */
  38        { 25000, 0x33088801, }, /*  40.0000 */
  39        { 22271, 0x33E22801, }, /*  44.9000 */
  40        { 20202, 0x336C4801, }, /*  49.5000 */
  41        { 20000, 0x23088801, }, /*  50.0000 */
  42        { 19860, 0x23088801, }, /*  50.3500 */
  43        { 18518, 0x3708A801, }, /*  54.0000 */
  44        { 17777, 0x23E36802, }, /*  56.2500 */
  45        { 17733, 0x23E36802, }, /*  56.3916 */
  46        { 17653, 0x23E36802, }, /*  56.6444 */
  47        { 16949, 0x37C45801, }, /*  59.0000 */
  48        { 15873, 0x23EC4801, }, /*  63.0000 */
  49        { 15384, 0x37911801, }, /*  65.0000 */
  50        { 14814, 0x37963803, }, /*  67.5000 */
  51        { 14124, 0x37058803, }, /*  70.8000 */
  52        { 13888, 0x3710C805, }, /*  72.0000 */
  53        { 13333, 0x37E22801, }, /*  75.0000 */
  54        { 12698, 0x27915801, }, /*  78.7500 */
  55        { 12500, 0x37D8D802, }, /*  80.0000 */
  56        { 11135, 0x27588802, }, /*  89.8000 */
  57        { 10582, 0x27EC4802, }, /*  94.5000 */
  58        { 10101, 0x27AC6803, }, /*  99.0000 */
  59        { 10000, 0x27088801, }, /* 100.0000 */
  60        {  9259, 0x2710C805, }, /* 108.0000 */
  61        {  8888, 0x27E36802, }, /* 112.5000 */
  62        {  7692, 0x27C58803, }, /* 130.0000 */
  63        {  7407, 0x27316803, }, /* 135.0000 */
  64        {  6349, 0x2F915801, }, /* 157.5000 */
  65        {  6172, 0x2F08A801, }, /* 162.0000 */
  66        {  5714, 0x2FB11802, }, /* 175.0000 */
  67        {  5291, 0x2FEC4802, }, /* 189.0000 */
  68        {  4950, 0x2F963803, }, /* 202.0000 */
  69        {  4310, 0x2FB1B802, }, /* 232.0000 */
  70};
  71
  72static void cs5530_set_dclk_frequency(struct fb_info *info)
  73{
  74        struct geodefb_par *par = info->par;
  75        int i;
  76        u32 value;
  77        long min, diff;
  78
  79        /* Search the table for the closest pixclock. */
  80        value = cs5530_pll_table[0].pll_value;
  81        min = cs5530_pll_table[0].pixclock - info->var.pixclock;
  82        if (min < 0) min = -min;
  83        for (i = 1; i < ARRAY_SIZE(cs5530_pll_table); i++) {
  84                diff = cs5530_pll_table[i].pixclock - info->var.pixclock;
  85                if (diff < 0L) diff = -diff;
  86                if (diff < min) {
  87                        min = diff;
  88                        value = cs5530_pll_table[i].pll_value;
  89                }
  90        }
  91
  92        writel(value, par->vid_regs + CS5530_DOT_CLK_CONFIG);
  93        writel(value | 0x80000100, par->vid_regs + CS5530_DOT_CLK_CONFIG); /* set reset and bypass */
  94        udelay(500); /* wait for PLL to settle */
  95        writel(value & 0x7FFFFFFF, par->vid_regs + CS5530_DOT_CLK_CONFIG); /* clear reset */
  96        writel(value & 0x7FFFFEFF, par->vid_regs + CS5530_DOT_CLK_CONFIG); /* clear bypass */
  97}
  98
  99static void cs5530_configure_display(struct fb_info *info)
 100{
 101        struct geodefb_par *par = info->par;
 102        u32 dcfg;
 103
 104        dcfg = readl(par->vid_regs + CS5530_DISPLAY_CONFIG);
 105
 106        /* Clear bits from existing mode. */
 107        dcfg &= ~(CS5530_DCFG_CRT_SYNC_SKW_MASK | CS5530_DCFG_PWR_SEQ_DLY_MASK
 108                  | CS5530_DCFG_CRT_HSYNC_POL   | CS5530_DCFG_CRT_VSYNC_POL
 109                  | CS5530_DCFG_FP_PWR_EN       | CS5530_DCFG_FP_DATA_EN
 110                  | CS5530_DCFG_DAC_PWR_EN      | CS5530_DCFG_VSYNC_EN
 111                  | CS5530_DCFG_HSYNC_EN);
 112
 113        /* Set default sync skew and power sequence delays.  */
 114        dcfg |= (CS5530_DCFG_CRT_SYNC_SKW_INIT | CS5530_DCFG_PWR_SEQ_DLY_INIT
 115                 | CS5530_DCFG_GV_PAL_BYP);
 116
 117        /* Enable DACs, hsync and vsync for CRTs */
 118        if (par->enable_crt) {
 119                dcfg |= CS5530_DCFG_DAC_PWR_EN;
 120                dcfg |= CS5530_DCFG_HSYNC_EN | CS5530_DCFG_VSYNC_EN;
 121        }
 122        /* Enable panel power and data if using a flat panel. */
 123        if (par->panel_x > 0) {
 124                dcfg |= CS5530_DCFG_FP_PWR_EN;
 125                dcfg |= CS5530_DCFG_FP_DATA_EN;
 126        }
 127
 128        /* Sync polarities. */
 129        if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
 130                dcfg |= CS5530_DCFG_CRT_HSYNC_POL;
 131        if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
 132                dcfg |= CS5530_DCFG_CRT_VSYNC_POL;
 133
 134        writel(dcfg, par->vid_regs + CS5530_DISPLAY_CONFIG);
 135}
 136
 137static int cs5530_blank_display(struct fb_info *info, int blank_mode)
 138{
 139        struct geodefb_par *par = info->par;
 140        u32 dcfg;
 141        int blank, hsync, vsync;
 142
 143        switch (blank_mode) {
 144        case FB_BLANK_UNBLANK:
 145                blank = 0; hsync = 1; vsync = 1;
 146                break;
 147        case FB_BLANK_NORMAL:
 148                blank = 1; hsync = 1; vsync = 1;
 149                break;
 150        case FB_BLANK_VSYNC_SUSPEND:
 151                blank = 1; hsync = 1; vsync = 0;
 152                break;
 153        case FB_BLANK_HSYNC_SUSPEND:
 154                blank = 1; hsync = 0; vsync = 1;
 155                break;
 156        case FB_BLANK_POWERDOWN:
 157                blank = 1; hsync = 0; vsync = 0;
 158                break;
 159        default:
 160                return -EINVAL;
 161        }
 162
 163        dcfg = readl(par->vid_regs + CS5530_DISPLAY_CONFIG);
 164
 165        dcfg &= ~(CS5530_DCFG_DAC_BL_EN | CS5530_DCFG_DAC_PWR_EN
 166                  | CS5530_DCFG_HSYNC_EN | CS5530_DCFG_VSYNC_EN
 167                  | CS5530_DCFG_FP_DATA_EN | CS5530_DCFG_FP_PWR_EN);
 168
 169        if (par->enable_crt) {
 170                if (!blank)
 171                        dcfg |= CS5530_DCFG_DAC_BL_EN | CS5530_DCFG_DAC_PWR_EN;
 172                if (hsync)
 173                        dcfg |= CS5530_DCFG_HSYNC_EN;
 174                if (vsync)
 175                        dcfg |= CS5530_DCFG_VSYNC_EN;
 176        }
 177        if (par->panel_x > 0) {
 178                if (!blank)
 179                        dcfg |= CS5530_DCFG_FP_DATA_EN;
 180                if (hsync && vsync)
 181                        dcfg |= CS5530_DCFG_FP_PWR_EN;
 182        }
 183
 184        writel(dcfg, par->vid_regs + CS5530_DISPLAY_CONFIG);
 185
 186        return 0;
 187}
 188
 189struct geode_vid_ops cs5530_vid_ops = {
 190        .set_dclk          = cs5530_set_dclk_frequency,
 191        .configure_display = cs5530_configure_display,
 192        .blank_display     = cs5530_blank_display,
 193};
 194