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/*
* Copyright (C) 2012 Alexey Galakhov
* Copyright (C) 2012 Juergen Beisert, Pengutronix
*
* 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.
*/
#include <config.h>
#include <common.h>
#include <init.h>
#include <clock.h>
#include <io.h>
#include <mach/s3c-iomap.h>
#include <mach/s3c-generic.h>
#include <mach/s3c-clocks.h>
static inline uint32_t clkdiv(uint32_t clk, unsigned bit, unsigned mask)
{
uint32_t ratio = (readl(S5P_CLK_DIV0) >> bit) & mask;
return clk / (ratio + 1);
}
uint32_t s3c_get_mpllclk(void)
{
uint32_t m, p, s;
uint32_t reg = readl(S5P_xPLL_CON + S5P_MPLL);
m = (reg >> 16) & 0x3ff;
p = (reg >> 8) & 0x3f;
s = (reg >> 0) & 0x7;
return m * ((S5PCXX_CLOCK_REFERENCE) / (p << s));
}
static uint32_t s3c_get_apllclk(void)
{
uint32_t m, p, s;
uint32_t reg = readl(S5P_xPLL_CON + S5P_APLL);
m = (reg >> 16) & 0x3ff;
p = (reg >> 8) & 0x3f;
s = (reg >> 0) & 0x7;
s -= 1;
return m * ((S5PCXX_CLOCK_REFERENCE) / (p << s));
}
static uint32_t s5p_get_a2mclk(void)
{
return clkdiv(s3c_get_apllclk(), 4, 0x7);
}
static uint32_t s5p_get_moutpsysclk(void)
{
if (readl(S5P_CLK_SRC0) & (1 << 24)) /* MUX_PSYS */
return s5p_get_a2mclk();
else
return s3c_get_mpllclk();
}
uint32_t s3c_get_hclk(void)
{
return clkdiv(s5p_get_moutpsysclk(), 24, 0xf);
}
uint32_t s3c_get_pclk(void)
{
return clkdiv(s3c_get_hclk(), 28, 0x7);
}
/* we are using the internal 'uclk1' as the UART source */
static unsigned s3c_get_uart_clk_uclk1(void)
{
unsigned clk = s3c_get_mpllclk(); /* TODO check for EPLL */
unsigned uartpdiv = ((readl(S5P_CLK_DIV4) >> 16) & 0x3) + 1; /* TODO this is UART0 only */
return clk / uartpdiv;
}
unsigned s3c_get_uart_clk(unsigned src) {
return (src & 1) ? s3c_get_uart_clk_uclk1() : s3c_get_pclk();
}
static int s5pcxx_dump_clocks(void)
{
printf("refclk: %7d kHz\n", S5PCXX_CLOCK_REFERENCE / 1000);
printf("apll: %7d kHz\n", s3c_get_apllclk() / 1000);
printf("mpll: %7d kHz\n", s3c_get_mpllclk() / 1000);
/* printf("CPU: %7d kHz\n", s3c_get_cpuclk() / 1000); */
printf("hclk: %7d kHz\n", s3c_get_hclk() / 1000);
printf("pclk: %7d kHz\n", s3c_get_pclk() / 1000);
return 0;
}
late_initcall(s5pcxx_dump_clocks);
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