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author | Matthew McClintock <msm@freescale.com> | 2012-08-13 13:21:19 +0000 |
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committer | Andy Fleming <afleming@freescale.com> | 2012-08-23 10:24:17 -0500 |
commit | 8c454047fe9c08a51410dca01b945cdcecb18b7e (patch) | |
tree | abe2c281cbaf813d2ae2c46d69e9c2dd05600b1e /nand_spl/board/freescale/common.c | |
parent | abbe536ebc3ee974593b115de716705f0091344a (diff) | |
download | u-boot-imx-8c454047fe9c08a51410dca01b945cdcecb18b7e.zip u-boot-imx-8c454047fe9c08a51410dca01b945cdcecb18b7e.tar.gz u-boot-imx-8c454047fe9c08a51410dca01b945cdcecb18b7e.tar.bz2 |
nand_spl: update udelay for Freescale boards
Let's use the more appropriate udelay for the nand_spl. While we
can't make use of u-boot's full udelay we can atl east use a for
loop that won't get optimized away .Since we have the bus clock
we can use the timebase to calculate wall time.
Looked at reusing the u-boot udelay functions but it pulls in a lot
of code and would require quite a bit of work to keep us within the
very small space constrains we currently have
Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Diffstat (limited to 'nand_spl/board/freescale/common.c')
-rw-r--r-- | nand_spl/board/freescale/common.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/nand_spl/board/freescale/common.c b/nand_spl/board/freescale/common.c new file mode 100644 index 0000000..0e099bc --- /dev/null +++ b/nand_spl/board/freescale/common.c @@ -0,0 +1,40 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * Author: Matthew McClintock <msm@freescale.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 <common.h> +#include <asm/processor.h> +#include <asm/global_data.h> + +DECLARE_GLOBAL_DATA_PTR; + +#ifndef CONFIG_SYS_FSL_TBCLK_DIV +#define CONFIG_SYS_FSL_TBCLK_DIV 8 +#endif + +void udelay(unsigned long usec) +{ + u32 ticks_per_usec = gd->bus_clk / (CONFIG_SYS_FSL_TBCLK_DIV * 1000000); + u32 ticks = ticks_per_usec * usec; + u32 s = mfspr(SPRN_TBRL); + + while ((mfspr(SPRN_TBRL) - s) < ticks); +} |