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gxfb/lxfb: detect framebuffer size using an MSR if VSA2 isn't available 

If there's no VSA2 (ie, if we're using tinybios or OpenFirmware), use the
GLIU's P2D Range Offset Descriptor to determine how much memory we have
available for the framebuffer.

Originally based on a patch by Jordan Crouse.  Tested with OpenFirmware;
Pascal informs me that tinybios has a stub that fills in P2D_RO0.

Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andres Salomon 2008-04-28 02:15:30 -07:00 committed by Linus Torvalds
parent 61a517a063
commit fd96795630
3 changed files with 35 additions and 1 deletions
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18
drivers/video/geode/display_gx.c
View File

@ -25,7 +25,23 @@ unsigned int gx_frame_buffer_size(void)
{
unsigned int val;
/* FB size is reported by a virtual register */
if (!geode_has_vsa2()) {
uint32_t hi, lo;
/* The number of pages is (PMAX - PMIN)+1 */
rdmsr(MSR_GLIU_P2D_RO0, lo, hi);
/* PMAX */
val = ((hi & 0xff) << 12) | ((lo & 0xfff00000) >> 20);
/* PMIN */
val -= (lo & 0x000fffff);
val += 1;
/* The page size is 4k */
return (val << 12);
}
/* FB size can be obtained from the VSA II */
/* Virtual register class = 0x02 */
/* VG_MEM_SIZE(512Kb units) = 0x00 */

16
drivers/video/geode/lxfb_ops.c
View File

@ -329,6 +329,22 @@ unsigned int lx_framebuffer_size(void)
{
unsigned int val;
if (!geode_has_vsa2()) {
uint32_t hi, lo;
/* The number of pages is (PMAX - PMIN)+1 */
rdmsr(MSR_GLIU_P2D_RO0, lo, hi);
/* PMAX */
val = ((hi & 0xff) << 12) | ((lo & 0xfff00000) >> 20);
/* PMIN */
val -= (lo & 0x000fffff);
val += 1;
/* The page size is 4k */
return (val << 12);
}
/* The frame buffer size is reported by a VSM in VSA II */
/* Virtual Register Class = 0x02 */
/* VG_MEM_SIZE (1MB units) = 0x00 */

2
include/asm-x86/geode.h
View File

@ -30,6 +30,8 @@ extern int geode_get_dev_base(unsigned int dev);
/* MSRS */
#define MSR_GLIU_P2D_RO0 0x10000029
#define MSR_LX_GLD_MSR_CONFIG 0x48002001
#define MSR_LX_MSR_PADSEL 0x48002011 /* NOT 0x48000011; the data
* sheet has the wrong value */