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