| /** |
| * @file |
| * @brief Provide OMAP independent utility APIs |
| * |
| * FileName: arch/arm/mach-omap/syslib.c |
| * |
| * Provide APIs which can be used from platform/architecture code |
| * to operate on |
| * |
| * Originally from http://linux.omap.com/pub/bootloader/3430sdp/u-boot-v1.tar.gz |
| */ |
| /* |
| * (C) Copyright 2006-2008 |
| * Texas Instruments, <www.ti.com> |
| * Richard Woodruff <r-woodruff2@ti.com> |
| * |
| * 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 |
| */ |
| |
| #include <config.h> |
| #include <common.h> |
| #include <asm/io.h> |
| #include <mach/syslib.h> |
| |
| /** |
| * @brief simple spin loop |
| * |
| * Will be constant time as its generally used in bypass conditions only. |
| * This is necessary until timers are accessible. if you need timed delays |
| * use @ref mdelay or @ref udelay instead |
| * |
| * @param[in] loops number of loops |
| * |
| * @return void |
| */ |
| void sdelay(unsigned long loops) |
| { |
| __asm__ volatile ("1:\n" "subs %0, %1, #1\n" |
| "bne 1b":"=r" (loops):"0"(loops)); |
| } |
| |
| /** |
| * @brief common routine to allow waiting for changes in volatile regs. |
| * |
| * @param[in] read_bit_mask the bit mask to read |
| * @param[in] match_value match to which value |
| * @param[in] read_addr address to read from |
| * @param[in] bound max iterations |
| * |
| * @return 1 if match_value is found, else if bound iterations reached, |
| * returns 0 |
| */ |
| u32 wait_on_value(u32 read_bit_mask, u32 match_value, u32 read_addr, u32 bound) |
| { |
| u32 i = 0, val; |
| do { |
| ++i; |
| val = readl(read_addr) & read_bit_mask; |
| if (val == match_value) |
| return 1; |
| if (i == bound) |
| return 0; |
| } while (1); |
| } |
| |