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1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
/*
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* (C) Copyright 2001-2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2002
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* David Mueller, ELSOFT AG, d.mueller@elsoft.ch
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/* This code should work for both the S3C2400 and the S3C2410
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* as they seem to have the same PLL and clock machinery inside.
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* The different address mapping is handled by the s3c24xx.h files below.
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*/
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#include <common.h>
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#ifdef CONFIG_S3C24X0
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#include <asm/io.h>
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#include <asm/arch/s3c24x0_cpu.h>
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#define MPLL 0
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#define UPLL 1
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/* ------------------------------------------------------------------------- */
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/* NOTE: This describes the proper use of this file.
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*
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* CONFIG_SYS_CLK_FREQ should be defined as the input frequency of the PLL.
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*
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* get_FCLK(), get_HCLK(), get_PCLK() and get_UCLK() return the clock of
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* the specified bus in HZ.
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*/
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/* ------------------------------------------------------------------------- */
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static ulong get_PLLCLK(int pllreg)
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{
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struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
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ulong r, m, p, s;
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if (pllreg == MPLL)
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r = readl(&clk_power->mpllcon);
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else if (pllreg == UPLL)
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r = readl(&clk_power->upllcon);
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else
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hang();
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m = ((r & 0xFF000) >> 12) + 8;
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p = ((r & 0x003F0) >> 4) + 2;
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s = r & 0x3;
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#if defined(CONFIG_S3C2440)
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if (pllreg == MPLL)
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return 2 * m * (CONFIG_SYS_CLK_FREQ / (p << s));
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#endif
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return (CONFIG_SYS_CLK_FREQ * m) / (p << s);
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}
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/* return FCLK frequency */
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ulong get_FCLK(void)
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{
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return get_PLLCLK(MPLL);
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}
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/* return HCLK frequency */
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ulong get_HCLK(void)
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{
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struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
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#ifdef CONFIG_S3C2440
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switch (readl(&clk_power->clkdivn) & 0x6) {
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default:
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case 0:
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return get_FCLK();
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case 2:
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return get_FCLK() / 2;
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case 4:
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return (readl(&clk_power->camdivn) & (1 << 9)) ?
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get_FCLK() / 8 : get_FCLK() / 4;
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case 6:
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return (readl(&clk_power->camdivn) & (1 << 8)) ?
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get_FCLK() / 6 : get_FCLK() / 3;
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}
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#else
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return (readl(&clk_power->clkdivn) & 2) ? get_FCLK() / 2 : get_FCLK();
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#endif
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}
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/* return PCLK frequency */
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ulong get_PCLK(void)
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{
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struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
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return (readl(&clk_power->clkdivn) & 1) ? get_HCLK() / 2 : get_HCLK();
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}
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/* return UCLK frequency */
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ulong get_UCLK(void)
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{
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return get_PLLCLK(UPLL);
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}
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#endif /* CONFIG_S3C24X0 */
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