mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-31 12:08:19 +00:00
1d9f410500
- Introducing the concept of SoCs "./cpu/$(CPU)/$(SOC)" - creating subdirs for SoCs ./cpu/arm920t/imx and ./cpu/arm920t/s3c24x0 - moving SoC specific code out of cpu/arm920t/ into cpu/arm920t/$(SOC)/ - moving drivers/s3c24x0_i2c.c and drivers/serial_imx.c out of drivers/ into cpu/arm920t/$(SOC)/
102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/*
|
|
* (C) Copyright 2001-2004
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* (C) Copyright 2002
|
|
* David Mueller, ELSOFT AG, d.mueller@elsoft.ch
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/* This code should work for both the S3C2400 and the S3C2410
|
|
* as they seem to have the same PLL and clock machinery inside.
|
|
* The different address mapping is handled by the s3c24xx.h files below.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB)
|
|
|
|
#if defined(CONFIG_S3C2400)
|
|
#include <s3c2400.h>
|
|
#elif defined(CONFIG_S3C2410)
|
|
#include <s3c2410.h>
|
|
#endif
|
|
|
|
#define MPLL 0
|
|
#define UPLL 1
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
/* NOTE: This describes the proper use of this file.
|
|
*
|
|
* CONFIG_SYS_CLK_FREQ should be defined as the input frequency of the PLL.
|
|
*
|
|
* get_FCLK(), get_HCLK(), get_PCLK() and get_UCLK() return the clock of
|
|
* the specified bus in HZ.
|
|
*/
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static ulong get_PLLCLK(int pllreg)
|
|
{
|
|
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
|
|
ulong r, m, p, s;
|
|
|
|
if (pllreg == MPLL)
|
|
r = clk_power->MPLLCON;
|
|
else if (pllreg == UPLL)
|
|
r = clk_power->UPLLCON;
|
|
else
|
|
hang();
|
|
|
|
m = ((r & 0xFF000) >> 12) + 8;
|
|
p = ((r & 0x003F0) >> 4) + 2;
|
|
s = r & 0x3;
|
|
|
|
return((CONFIG_SYS_CLK_FREQ * m) / (p << s));
|
|
}
|
|
|
|
/* return FCLK frequency */
|
|
ulong get_FCLK(void)
|
|
{
|
|
return(get_PLLCLK(MPLL));
|
|
}
|
|
|
|
/* return HCLK frequency */
|
|
ulong get_HCLK(void)
|
|
{
|
|
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
|
|
|
|
return((clk_power->CLKDIVN & 0x2) ? get_FCLK()/2 : get_FCLK());
|
|
}
|
|
|
|
/* return PCLK frequency */
|
|
ulong get_PCLK(void)
|
|
{
|
|
S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
|
|
|
|
return((clk_power->CLKDIVN & 0x1) ? get_HCLK()/2 : get_HCLK());
|
|
}
|
|
|
|
/* return UCLK frequency */
|
|
ulong get_UCLK(void)
|
|
{
|
|
return(get_PLLCLK(UPLL));
|
|
}
|
|
|
|
#endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */
|