| Matthew McClintock | 4a71d58 | 2012-08-13 13:21:19 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Freescale Semiconductor, Inc. |
| 3 | * Author: Matthew McClintock <msm@freescale.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
| 7 | * published by the Free Software Foundation; either version 2 of |
| 8 | * the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 19 | * MA 02111-1307 USA |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <common.h> |
| 24 | #include <asm/processor.h> |
| 25 | #include <asm/global_data.h> |
| 26 | |
| 27 | DECLARE_GLOBAL_DATA_PTR; |
| 28 | |
| 29 | #ifndef CONFIG_SYS_FSL_TBCLK_DIV |
| 30 | #define CONFIG_SYS_FSL_TBCLK_DIV 8 |
| 31 | #endif |
| 32 | |
| 33 | void udelay(unsigned long usec) |
| 34 | { |
| 35 | u32 ticks_per_usec = gd->bus_clk / (CONFIG_SYS_FSL_TBCLK_DIV * 1000000); |
| 36 | u32 ticks = ticks_per_usec * usec; |
| 37 | u32 s = mfspr(SPRN_TBRL); |
| 38 | |
| 39 | while ((mfspr(SPRN_TBRL) - s) < ticks); |
| 40 | } |