drivers/video/geode/display_gx.c

   1 /*
   2  * Geode GX display controller.
   3  *
   4  *   Copyright (C) 2005 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/spinlock.h>
  15 #include <linux/fb.h>
  16 #include <linux/delay.h>
  17 #include <asm/io.h>
  18 #include <asm/div64.h>
  19 #include <asm/delay.h>
  20 #include <linux/cs5535.h>
  21
  22 #include "gxfb.h"
  23
  24 unsigned int gx_frame_buffer_size(void)
  25 {
  26         unsigned int val;
  27
  28         if (!cs5535_has_vsa2()) {
  29                 uint32_t hi, lo;
  30
  31                 /* The number of pages is (PMAX - PMIN)+1 */
  32                 rdmsr(MSR_GLIU_P2D_RO0, lo, hi);
  33
  34                 /* PMAX */
  35                 val = ((hi & 0xff) << 12) | ((lo & 0xfff00000) >> 20);
  36                 /* PMIN */
  37                 val -= (lo & 0x000fffff);
  38                 val += 1;
  39
  40                 /* The page size is 4k */
  41                 return (val << 12);
  42         }
  43
  44         /* FB size can be obtained from the VSA II */
  45         /* Virtual register class = 0x02 */
  46         /* VG_MEM_SIZE(512Kb units) = 0x00 */
  47
  48         outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
  49         outw(VSA_VR_MEM_SIZE, VSA_VRC_INDEX);
  50
  51         val = (unsigned int)(inw(VSA_VRC_DATA)) & 0xFFl;
  52         return (val << 19);
  53 }
  54
  55 int gx_line_delta(int xres, int bpp)
  56 {
  57         /* Must be a multiple of 8 bytes. */
  58         return (xres * (bpp >> 3) + 7) & ~0x7;
  59 }
  60
  61 void gx_set_mode(struct fb_info *info)
  62 {
  63         struct gxfb_par *par = info->par;
  64         u32 gcfg, dcfg;
  65         int hactive, hblankstart, hsyncstart, hsyncend, hblankend, htotal;
  66         int vactive, vblankstart, vsyncstart, vsyncend, vblankend, vtotal;
  67
  68         /* Unlock the display controller registers. */
  69         write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
  70
  71         gcfg = read_dc(par, DC_GENERAL_CFG);
  72         dcfg = read_dc(par, DC_DISPLAY_CFG);
  73
  74         /* Disable the timing generator. */
  75         dcfg &= ~DC_DISPLAY_CFG_TGEN;
  76         write_dc(par, DC_DISPLAY_CFG, dcfg);
  77
  78         /* Wait for pending memory requests before disabling the FIFO load. */
  79         udelay(100);
  80
  81         /* Disable FIFO load and compression. */
  82         gcfg &= ~(DC_GENERAL_CFG_DFLE | DC_GENERAL_CFG_CMPE |
  83                         DC_GENERAL_CFG_DECE);
  84         write_dc(par, DC_GENERAL_CFG, gcfg);
  85
  86         /* Setup DCLK and its divisor. */
  87         gx_set_dclk_frequency(info);
  88
  89         /*
  90          * Setup new mode.
  91          */
  92
  93         /* Clear all unused feature bits. */
  94         gcfg &= DC_GENERAL_CFG_YUVM | DC_GENERAL_CFG_VDSE;
  95         dcfg = 0;
  96
  97         /* Set FIFO priority (default 6/5) and enable. */
  98         /* FIXME: increase fifo priority for 1280x1024 and higher modes? */
  99         gcfg |= (6 << DC_GENERAL_CFG_DFHPEL_SHIFT) |
 100                 (5 << DC_GENERAL_CFG_DFHPSL_SHIFT) | DC_GENERAL_CFG_DFLE;
 101
 102         /* Framebuffer start offset. */
 103         write_dc(par, DC_FB_ST_OFFSET, 0);
 104
 105         /* Line delta and line buffer length. */
 106         write_dc(par, DC_GFX_PITCH, info->fix.line_length >> 3);
 107         write_dc(par, DC_LINE_SIZE,
 108                 ((info->var.xres * info->var.bits_per_pixel/8) >> 3) + 2);
 109
 110
 111         /* Enable graphics and video data and unmask address lines. */
 112         dcfg |= DC_DISPLAY_CFG_GDEN | DC_DISPLAY_CFG_VDEN |
 113                 DC_DISPLAY_CFG_A20M | DC_DISPLAY_CFG_A18M;
 114
 115         /* Set pixel format. */
 116         switch (info->var.bits_per_pixel) {
 117         case 8:
 118                 dcfg |= DC_DISPLAY_CFG_DISP_MODE_8BPP;
 119                 break;
 120         case 16:
 121                 dcfg |= DC_DISPLAY_CFG_DISP_MODE_16BPP;
 122                 break;
 123         case 32:
 124                 dcfg |= DC_DISPLAY_CFG_DISP_MODE_24BPP;
 125                 dcfg |= DC_DISPLAY_CFG_PALB;
 126                 break;
 127         }
 128
 129         /* Enable timing generator. */
 130         dcfg |= DC_DISPLAY_CFG_TGEN;
 131
 132         /* Horizontal and vertical timings. */
 133         hactive = info->var.xres;
 134         hblankstart = hactive;
 135         hsyncstart = hblankstart + info->var.right_margin;
 136         hsyncend =  hsyncstart + info->var.hsync_len;
 137         hblankend = hsyncend + info->var.left_margin;
 138         htotal = hblankend;
 139
 140         vactive = info->var.yres;
 141         vblankstart = vactive;
 142         vsyncstart = vblankstart + info->var.lower_margin;
 143         vsyncend =  vsyncstart + info->var.vsync_len;
 144         vblankend = vsyncend + info->var.upper_margin;
 145         vtotal = vblankend;
 146
 147         write_dc(par, DC_H_ACTIVE_TIMING, (hactive - 1)    |
 148                         ((htotal - 1) << 16));
 149         write_dc(par, DC_H_BLANK_TIMING, (hblankstart - 1) |
 150                         ((hblankend - 1) << 16));
 151         write_dc(par, DC_H_SYNC_TIMING, (hsyncstart - 1)   |
 152                         ((hsyncend - 1) << 16));
 153
 154         write_dc(par, DC_V_ACTIVE_TIMING, (vactive - 1)    |
 155                         ((vtotal - 1) << 16));
 156         write_dc(par, DC_V_BLANK_TIMING, (vblankstart - 1) |
 157                         ((vblankend - 1) << 16));
 158         write_dc(par, DC_V_SYNC_TIMING, (vsyncstart - 1)   |
 159                         ((vsyncend - 1) << 16));
 160
 161         /* Write final register values. */
 162         write_dc(par, DC_DISPLAY_CFG, dcfg);
 163         write_dc(par, DC_GENERAL_CFG, gcfg);
 164
 165         gx_configure_display(info);
 166
 167         /* Relock display controller registers */
 168         write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);
 169 }
 170
 171 void gx_set_hw_palette_reg(struct fb_info *info, unsigned regno,
 172                 unsigned red, unsigned green, unsigned blue)
 173 {
 174         struct gxfb_par *par = info->par;
 175         int val;
 176
 177         /* Hardware palette is in RGB 8-8-8 format. */
 178         val  = (red   << 8) & 0xff0000;
 179         val |= (green)      & 0x00ff00;
 180         val |= (blue  >> 8) & 0x0000ff;
 181
 182         write_dc(par, DC_PAL_ADDRESS, regno);
 183         write_dc(par, DC_PAL_DATA, val);
 184 }