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authorwdenk <wdenk>2005-04-03 15:51:42 +0000
committerwdenk <wdenk>2005-04-03 15:51:42 +0000
commit756f586a73d756f163dc03a049d650cc1a5b5899 (patch)
tree15cd902e173aa72118ee90622ffe5492d7243b70 /board/hidden_dragon/speed.h
parentb1bf6f2c9b4aa17c6ccb7a631c99fae7f4b5744b (diff)
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* Patch by Yusdi Santoso, 22 Oct 2004:
- Add support for HIDDEN_DRAGON board - fix endianess problem in driver/rtl1839.c * Patch by Allen Curtis, 21 Oct 2004: support multiple serial ports
Diffstat (limited to 'board/hidden_dragon/speed.h')
-rw-r--r--board/hidden_dragon/speed.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/board/hidden_dragon/speed.h b/board/hidden_dragon/speed.h
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+/*
+ * (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.
+ */