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authorRudolf Marek <r.marek@assembler.cz>2011-01-16 16:23:51 +0000
committerRudolf Marek <r.marek@assembler.cz>2011-01-16 16:23:51 +0000
commitaa55f3768a5420715c9b9bdf01d809a2110103a4 (patch)
treeb4295e0508a54a349dd817ff38582123bac4cd50 /src/mainboard
parentc3dc8f8ebc57f35132687a1a1a201ef08063c195 (diff)
Trivial, cleanup of GPIO comments.
Signed-off-by: Rudolf Marek <r.marek@assembler.cz> Acked-by: Rudolf Marek <r.marek@assembler.cz> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6256 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/mainboard')
-rw-r--r--src/mainboard/asrock/939a785gmh/romstage.c39
1 files changed, 25 insertions, 14 deletions
diff --git a/src/mainboard/asrock/939a785gmh/romstage.c b/src/mainboard/asrock/939a785gmh/romstage.c
index 76b8b510b9..c5f3a8b196 100644
--- a/src/mainboard/asrock/939a785gmh/romstage.c
+++ b/src/mainboard/asrock/939a785gmh/romstage.c
@@ -78,7 +78,7 @@ static void sio_init(void)
pnp_enter_ext_func_mode(GPIO2345_DEV);
pnp_set_logical_device(GPIO2345_DEV);
- /* Pin 119 ~ 120 GP21, GP20 */
+ /* Pin 119 ~ 120 is GP21, GP20 */
reg = pnp_read_config(GPIO2345_DEV, 0x29);
pnp_write_config(GPIO2345_DEV, 0x29, (reg | 2));
@@ -90,28 +90,39 @@ static void sio_init(void)
pnp_write_config(GPIO2345_DEV, 0x2c, 0x1);
pnp_write_config(GPIO2345_DEV, 0x2d, 0x1);
-//idx 30 e0 e1 e2 e3 e4 e5 e6 e7 e8 e9 f0 f1 f2 f3 f4 f5 f6 f7 fe
-//val 07 XX XX XX f6 0e 00 00 00 00 ff d6 96 00 40 d0 83 00 00 07
-
-//GPO20 - 1 = 1.82 0 = 1.92 sideport voltage
-//mGPUV GPO40 | GPO41 | GPIO23 - 000 - 1.45V step 0.05 -- 111 - 1.10V
-//DDR voltage 44 45 46
-
- /* GPO20 - sideport voltage GPO23 - mgpuV */
+ /* GPO20 - sideport voltage 1 = 1.82 0 = 1.92
+ GPI21 - unknown input (NC?)
+ GPI22 - unknown input (NC?)
+ GPO23 - mgpuV bit0
+ GP24-27 - PS/2 mouse/keyb (only keyb is connected use flip interface for mouse)*/
+ */
pnp_write_config(GPIO2345_DEV, 0x30, 0x07); /* Enable GPIO 2,3,4. */
pnp_write_config(GPIO2345_DEV, 0xe3, 0xf6); /* dir of GPIO2 11110110*/
pnp_write_config(GPIO2345_DEV, 0xe4, 0x0e); /* data */
pnp_write_config(GPIO2345_DEV, 0xe5, 0x00); /* No inversion */
- /* GPO30 GPO33 GPO35 */
- //GPO35 - loadline control 0 - enabled
- //GPIO30 - unknown
- //GPIO33 - unknown
+ /* GPIO30 - unknown output, set to 0
+ GPI31 - unknown input NC?
+ GPI32 - unknown input NC?
+ GPIO33 - unknown output, set to 0.
+ GPI34 - unknown input NC?
+ GPO35 - loadline control 1 = enabled (2 phase clock) 0 = disabled 4 phase clock
+ GPIO36 - input = HT voltage 1.30V output (low) = HT voltage 1.35V
+ GP37 - unknown input NC? */
+
pnp_write_config(GPIO2345_DEV, 0xf0, 0xd6); /* dir of GPIO3 11010110*/
pnp_write_config(GPIO2345_DEV, 0xf1, 0x96); /* data */
pnp_write_config(GPIO2345_DEV, 0xf2, 0x00); /* No inversion */
- /* GPO40 GPO41 GPO42 GPO43 PO45 */
+ /* GPO40 - mgpuV bit2
+ GPO41 - mgpuV bit1
+ GPO42 - IRTX
+ GPO43 - IRRX
+ GPIO44 - memory voltage bit2 (input/outputlow)
+ GPIO45 - memory voltage bit1 (2.60 (000) - 2.95 (111))
+ GPIO46 - memory voltage bit0
+ GPIO47 - unknown input? */
+
pnp_write_config(GPIO2345_DEV, 0xf4, 0xd0); /* dir of GPIO4 11010000 */
pnp_write_config(GPIO2345_DEV, 0xf5, 0x83); /* data */
pnp_write_config(GPIO2345_DEV, 0xf6, 0x00); /* No inversion */