99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Copyright (C) 2012 Alexey Galakhov
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* Copyright (C) 2012 Juergen Beisert, Pengutronix
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <config.h>
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#include <common.h>
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#include <init.h>
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#include <clock.h>
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#include <io.h>
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#include <mach/s3c-iomap.h>
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#include <mach/s3c-generic.h>
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#include <mach/s3c-clocks.h>
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static inline uint32_t clkdiv(uint32_t clk, unsigned bit, unsigned mask)
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{
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uint32_t ratio = (readl(S5P_CLK_DIV0) >> bit) & mask;
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return clk / (ratio + 1);
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}
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uint32_t s3c_get_mpllclk(void)
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{
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uint32_t m, p, s;
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uint32_t reg = readl(S5P_xPLL_CON + S5P_MPLL);
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m = (reg >> 16) & 0x3ff;
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p = (reg >> 8) & 0x3f;
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s = (reg >> 0) & 0x7;
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return m * ((S5PCXX_CLOCK_REFERENCE) / (p << s));
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}
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uint32_t s3c_get_apllclk(void)
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{
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uint32_t m, p, s;
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uint32_t reg = readl(S5P_xPLL_CON + S5P_APLL);
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m = (reg >> 16) & 0x3ff;
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p = (reg >> 8) & 0x3f;
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s = (reg >> 0) & 0x7;
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s -= 1;
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return m * ((S5PCXX_CLOCK_REFERENCE) / (p << s));
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}
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static uint32_t s5p_get_a2mclk(void)
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{
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return clkdiv(s3c_get_apllclk(), 4, 0x7);
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}
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static uint32_t s5p_get_moutpsysclk(void)
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{
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if (readl(S5P_CLK_SRC0) & (1 << 24)) /* MUX_PSYS */
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return s5p_get_a2mclk();
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else
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return s3c_get_mpllclk();
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}
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uint32_t s3c_get_hclk(void)
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{
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return clkdiv(s5p_get_moutpsysclk(), 24, 0xf);
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}
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uint32_t s3c_get_pclk(void)
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{
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return clkdiv(s3c_get_hclk(), 28, 0x7);
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}
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/* we are using the internal 'uclk1' as the UART source */
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static unsigned s3c_get_uart_clk_uclk1(void)
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{
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unsigned clk = s3c_get_mpllclk(); /* TODO check for EPLL */
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unsigned uartpdiv = ((readl(S5P_CLK_DIV4) >> 16) & 0x3) + 1; /* TODO this is UART0 only */
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return clk / uartpdiv;
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}
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unsigned s3c_get_uart_clk(unsigned src) {
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return (src & 1) ? s3c_get_uart_clk_uclk1() : s3c_get_pclk();
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}
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int s5pcxx_dump_clocks(void)
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{
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printf("refclk: %7d kHz\n", S5PCXX_CLOCK_REFERENCE / 1000);
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printf("apll: %7d kHz\n", s3c_get_apllclk() / 1000);
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printf("mpll: %7d kHz\n", s3c_get_mpllclk() / 1000);
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/* printf("CPU: %7d kHz\n", s3c_get_cpuclk() / 1000); */
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printf("hclk: %7d kHz\n", s3c_get_hclk() / 1000);
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printf("pclk: %7d kHz\n", s3c_get_pclk() / 1000);
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return 0;
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}
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late_initcall(s5pcxx_dump_clocks);
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