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authorwdenk2003-10-09 19:00:25 +0000
committerwdenk2003-10-09 19:00:25 +0000
commit15647dc7fd86bbaeb68740929ecb9f8473c7ceae (patch)
tree1f2cefc002e07f517bcaf19b5a400b5a8a543e0c /board/etin/debris/speed.h
parenta0ff7f2eda50de4d4096265a086c94ac640fab7c (diff)
* Patches by Thomas Lange, 09 Oct 2003:
- fix cmd_ide.c for non ppc boards (read/write functions did not add ATA base address) - fix for shannon board - #ifdef CONFIG_IDE_8xx_DIRECT some otherwise unused code * Patch by Sangmoon Kim, 07 Oct 2003: add support for debris board
Diffstat (limited to 'board/etin/debris/speed.h')
-rw-r--r--board/etin/debris/speed.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/board/etin/debris/speed.h b/board/etin/debris/speed.h
new file mode 100644
index 00000000000..b66393bec58
--- /dev/null
+++ b/board/etin/debris/speed.h
@@ -0,0 +1,54 @@
+/*
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*-----------------------------------------------------------------------
+ * Timer value for timer 2, ICLK = 10
+ *
+ * SPEED_FCOUNT2 = GCLK / (16 * (TIMER_TMR_PS + 1))
+ * SPEED_TMR3_PS = (GCLK / (16 * SPEED_FCOUNT3)) - 1
+ *
+ * SPEED_FCOUNT2 timer 2 counting frequency
+ * GCLK CPU clock
+ * SPEED_TMR2_PS prescaler
+ */
+#define SPEED_TMR2_PS (250 - 1) /* divide by 250 */
+
+/*-----------------------------------------------------------------------
+ * Timer value for PIT
+ *
+ * PIT_TIME = SPEED_PITC / PITRTCLK
+ * PITRTCLK = 8192
+ */
+#define SPEED_PITC (82 << 16) /* start counting from 82 */
+
+/*
+ * The new value for PTA is calculated from
+ *
+ * PTA = (gclk * Trefresh) / (2 ^ (2 * DFBRG) * PTP * NCS)
+ *
+ * gclk CPU clock (not bus clock !)
+ * Trefresh Refresh cycle * 4 (four word bursts used)
+ * DFBRG For normal mode (no clock reduction) always 0
+ * PTP Prescaler (already adjusted for no. of banks and 4K / 8K refresh)
+ * NCS Number of SDRAM banks (chip selects) on this UPM.
+ */