/* Copyright (c) 2005 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Neither the name of the Advanced Micro Devices, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
* */
/*
* This file contains routines used in the initialization of Geode-family
* processors.
* */
/*----------------------------------------------------------------------------
* gfx_gxm_config_read
*
* This routine reads the value of the specified GXm configuration register.
*----------------------------------------------------------------------------
*/
unsigned char
gfx_gxm_config_read(unsigned char index)
{
unsigned char value = 0xFF;
unsigned char lock;
OUTB(0x22, GXM_CONFIG_CCR3);
lock = INB(0x23);
OUTB(0x22, GXM_CONFIG_CCR3);
OUTB(0x23, (unsigned char) (lock | 0x10));
OUTB(0x22, index);
value = INB(0x23);
OUTB(0x22, GXM_CONFIG_CCR3);
OUTB(0x23, lock);
return (value);
}
/*----------------------------------------------------------------------------
* gfx_get_core_freq
*
* This routine returns the core clock frequency of a GXm if valid jumper
* settings are detected; 0 It assumes that a 33.3 MHz PCI clock is being used
* for GX1.
* For SCx2xx, the fast PCI divisor is read.
*----------------------------------------------------------------------------
*/
#if GFX_INIT_DYNAMIC
unsigned long
gu1_get_core_freq(void)
#else
unsigned long
gfx_get_core_freq(void)
#endif
{
unsigned char dir0, dir1;
unsigned long cpu_speed;
dir0 = gfx_gxm_config_read(GXM_CONFIG_DIR0) & 0x0F;
dir1 = gfx_gxm_config_read(GXM_CONFIG_DIR1);
/* REVISION 4.0 AND UP */
if (dir1 >= 0x50) {
switch (dir0) {
case 0:
case 2:
cpu_speed = 133;
break;
case 5:
cpu_speed = 166;
break;
case 3:
cpu_speed = 200;
break;
case 6:
cpu_speed = 233;
break;
case 7:
cpu_speed = 266;
break;
case 4:
cpu_speed = 300;
break;
case 1:
cpu_speed = 333;
break;
default:
return (0);
}
}
else {
switch (dir0) {
case 0:
case 2:
cpu_speed = 133;
break;
case 7:
cpu_speed = 166;
break;
case 1:
case 3:
cpu_speed = 200;
break;
case 4:
case 6:
cpu_speed = 233;
break;
case 5:
cpu_speed = 266;
break;
default:
return (0);
}
}
if ((gfx_cpu_version & 0xFF) == GFX_CPU_SC1200) {
cpu_speed = (cpu_speed * gfx_pci_speed_khz) / 33300;
}
return (cpu_speed);
}
/*----------------------------------------------------------------------------
* gfx_get_cpu_register_base
*
* This routine returns the base address for graphics registers.
*----------------------------------------------------------------------------
*/
#if GFX_INIT_DYNAMIC
unsigned long
gu1_get_cpu_register_base(void)
#else
unsigned long
gfx_get_cpu_register_base(void)
#endif
{
unsigned long base;
base = (unsigned long) gfx_gxm_config_read(GXM_CONFIG_GCR);
base = (base & 0x03) << 30;
return (base);
}
/*----------------------------------------------------------------------------
* gfx_get_frame_buffer_base
*
* This routine returns the base address for graphics memory. This is an
* offset of 0x00800000 from the base address specified in the GCR register.
*
* The function returns zero if the GCR indicates the graphics subsystem
* is disabled.
*----------------------------------------------------------------------------
*/
#if GFX_INIT_DYNAMIC
unsigned long
gu1_get_frame_buffer_base(void)
#else
unsigned long
gfx_get_frame_buffer_base(void)
#endif
{
unsigned long base;
base = (unsigned long) gfx_gxm_config_read(GXM_CONFIG_GCR);
base = (base & 0x03) << 30;
if (base)
base |= 0x00800000;
return (base);
}
/*----------------------------------------------------------------------------
* gfx_get_frame_buffer_size
*
* This routine returns the total size of graphics memory, in bytes.
*
* Currently this routine is hardcoded to return 2 Meg.
*----------------------------------------------------------------------------
*/
#if GFX_INIT_DYNAMIC
unsigned long
gu1_get_frame_buffer_size(void)
#else
unsigned long
gfx_get_frame_buffer_size(void)
#endif
{
#if FB4MB
return (0x00400000);
#else
return (0x00200000);
#endif
}
/*----------------------------------------------------------------------------
* gfx_get_vid_register_base
*
* This routine returns the base address for the video hardware. It assumes
* an offset of 0x00010000 from the base address specified by the GCR.
*
* The function returns zero if the GCR indicates the graphics subsystem
* is disabled.
*----------------------------------------------------------------------------
*/
#if GFX_INIT_DYNAMIC
unsigned long
gu1_get_vid_register_base(void)
#else
unsigned long
gfx_get_vid_register_base(void)
#endif
{
unsigned long base;
base = (unsigned long) gfx_gxm_config_read(GXM_CONFIG_GCR);
base = (base & 0x03) << 30;
if (base)
base |= 0x00010000;
return (base);
}
/*----------------------------------------------------------------------------
* gfx_get_vip_register_base
*
* This routine returns the base address for the VIP hardware. This is
* only applicable to the SC1200, for which this routine assumes an offset
* of 0x00015000 from the base address specified by the GCR.
*
* The function returns zero if the GCR indicates the graphics subsystem
* is disabled.
*----------------------------------------------------------------------------
*/
#if GFX_INIT_DYNAMIC
unsigned long
gu1_get_vip_register_base(void)
#else
unsigned long
gfx_get_vip_register_base(void)
#endif
{
unsigned long base = 0;
if ((gfx_cpu_version & 0xFF) == GFX_CPU_SC1200) {
base = (unsigned long) gfx_gxm_config_read(GXM_CONFIG_GCR);
base = (base & 0x03) << 30;
if (base)
base |= 0x00015000;
}
return (base);
}
/* END OF FILE */