95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (c) 2009 Simtec Electronics
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// http://armlinux.simtec.co.uk/
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// Ben Dooks <ben@simtec.co.uk>
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//
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// S3C24XX CPU Frequency scaling - utils for S3C2410/S3C2440/S3C2442
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/cpufreq.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include "map.h"
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#include "regs-clock.h"
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#include <linux/soc/samsung/s3c-cpufreq-core.h>
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#include "regs-mem-s3c24xx.h"
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/**
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* s3c2410_cpufreq_setrefresh - set SDRAM refresh value
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* @cfg: The frequency configuration
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*
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* Set the SDRAM refresh value appropriately for the configured
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* frequency.
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*/
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void s3c2410_cpufreq_setrefresh(struct s3c_cpufreq_config *cfg)
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{
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struct s3c_cpufreq_board *board = cfg->board;
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unsigned long refresh;
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unsigned long refval;
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/* Reduce both the refresh time (in ns) and the frequency (in MHz)
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* down to ensure that we do not overflow 32 bit numbers.
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*
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* This should work for HCLK up to 133MHz and refresh period up
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* to 30usec.
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*/
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refresh = (cfg->freq.hclk / 100) * (board->refresh / 10);
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refresh = DIV_ROUND_UP(refresh, (1000 * 1000)); /* apply scale */
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refresh = (1 << 11) + 1 - refresh;
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s3c_freq_dbg("%s: refresh value %lu\n", __func__, refresh);
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refval = __raw_readl(S3C2410_REFRESH);
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refval &= ~((1 << 12) - 1);
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refval |= refresh;
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__raw_writel(refval, S3C2410_REFRESH);
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}
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/**
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* s3c2410_set_fvco - set the PLL value
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* @cfg: The frequency configuration
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*/
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void s3c2410_set_fvco(struct s3c_cpufreq_config *cfg)
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{
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if (!IS_ERR(cfg->mpll))
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clk_set_rate(cfg->mpll, cfg->pll.frequency);
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}
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#if defined(CONFIG_CPU_S3C2440) || defined(CONFIG_CPU_S3C2442)
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u32 s3c2440_read_camdivn(void)
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{
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return __raw_readl(S3C2440_CAMDIVN);
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}
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void s3c2440_write_camdivn(u32 camdiv)
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{
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__raw_writel(camdiv, S3C2440_CAMDIVN);
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}
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#endif
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u32 s3c24xx_read_clkdivn(void)
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{
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return __raw_readl(S3C2410_CLKDIVN);
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}
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void s3c24xx_write_clkdivn(u32 clkdiv)
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{
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__raw_writel(clkdiv, S3C2410_CLKDIVN);
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}
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u32 s3c24xx_read_mpllcon(void)
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{
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return __raw_readl(S3C2410_MPLLCON);
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}
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void s3c24xx_write_locktime(u32 locktime)
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{
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return __raw_writel(locktime, S3C2410_LOCKTIME);
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}
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