diff options
Diffstat (limited to 'arch/arm/mach-s3c2412/cpu-freq.c')
| -rw-r--r-- | arch/arm/mach-s3c2412/cpu-freq.c | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/arch/arm/mach-s3c2412/cpu-freq.c b/arch/arm/mach-s3c2412/cpu-freq.c deleted file mode 100644 index 125be7d5fa60..000000000000 --- a/arch/arm/mach-s3c2412/cpu-freq.c +++ /dev/null @@ -1,259 +0,0 @@ -/* linux/arch/arm/mach-s3c2412/cpu-freq.c - * - * Copyright 2008 Simtec Electronics - * http://armlinux.simtec.co.uk/ - * Ben Dooks <ben@simtec.co.uk> - * - * S3C2412 CPU Frequency scalling - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. -*/ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/interrupt.h> -#include <linux/ioport.h> -#include <linux/cpufreq.h> -#include <linux/device.h> -#include <linux/delay.h> -#include <linux/clk.h> -#include <linux/err.h> -#include <linux/io.h> - -#include <asm/mach/arch.h> -#include <asm/mach/map.h> - -#include <mach/regs-clock.h> -#include <mach/regs-s3c2412-mem.h> - -#include <plat/cpu.h> -#include <plat/clock.h> -#include <plat/cpu-freq-core.h> - -/* our clock resources. */ -static struct clk *xtal; -static struct clk *fclk; -static struct clk *hclk; -static struct clk *armclk; - -/* HDIV: 1, 2, 3, 4, 6, 8 */ - -static int s3c2412_cpufreq_calcdivs(struct s3c_cpufreq_config *cfg) -{ - unsigned int hdiv, pdiv, armdiv, dvs; - unsigned long hclk, fclk, armclk, armdiv_clk; - unsigned long hclk_max; - - fclk = cfg->freq.fclk; - armclk = cfg->freq.armclk; - hclk_max = cfg->max.hclk; - - /* We can't run hclk above armclk as at the best we have to - * have armclk and hclk in dvs mode. */ - - if (hclk_max > armclk) - hclk_max = armclk; - - s3c_freq_dbg("%s: fclk=%lu, armclk=%lu, hclk_max=%lu\n", - __func__, fclk, armclk, hclk_max); - s3c_freq_dbg("%s: want f=%lu, arm=%lu, h=%lu, p=%lu\n", - __func__, cfg->freq.fclk, cfg->freq.armclk, - cfg->freq.hclk, cfg->freq.pclk); - - armdiv = fclk / armclk; - - if (armdiv < 1) - armdiv = 1; - if (armdiv > 2) - armdiv = 2; - - cfg->divs.arm_divisor = armdiv; - armdiv_clk = fclk / armdiv; - - hdiv = armdiv_clk / hclk_max; - if (hdiv < 1) - hdiv = 1; - - cfg->freq.hclk = hclk = armdiv_clk / hdiv; - - /* set dvs depending on whether we reached armclk or not. */ - cfg->divs.dvs = dvs = armclk < armdiv_clk; - - /* update the actual armclk we achieved. */ - cfg->freq.armclk = dvs ? hclk : armdiv_clk; - - s3c_freq_dbg("%s: armclk %lu, hclk %lu, armdiv %d, hdiv %d, dvs %d\n", - __func__, armclk, hclk, armdiv, hdiv, cfg->divs.dvs); - - if (hdiv > 4) - goto invalid; - - pdiv = (hclk > cfg->max.pclk) ? 2 : 1; - - if ((hclk / pdiv) > cfg->max.pclk) - pdiv++; - - cfg->freq.pclk = hclk / pdiv; - - s3c_freq_dbg("%s: pdiv %d\n", __func__, pdiv); - - if (pdiv > 2) - goto invalid; - - pdiv *= hdiv; - - /* store the result, and then return */ - - cfg->divs.h_divisor = hdiv * armdiv; - cfg->divs.p_divisor = pdiv * armdiv; - - return 0; - - invalid: - return -EINVAL; -} - -static void s3c2412_cpufreq_setdivs(struct s3c_cpufreq_config *cfg) -{ - unsigned long clkdiv; - unsigned long olddiv; - - olddiv = clkdiv = __raw_readl(S3C2410_CLKDIVN); - - /* clear off current clock info */ - - clkdiv &= ~S3C2412_CLKDIVN_ARMDIVN; - clkdiv &= ~S3C2412_CLKDIVN_HDIVN_MASK; - clkdiv &= ~S3C2412_CLKDIVN_PDIVN; - - if (cfg->divs.arm_divisor == 2) - clkdiv |= S3C2412_CLKDIVN_ARMDIVN; - - clkdiv |= ((cfg->divs.h_divisor / cfg->divs.arm_divisor) - 1); - - if (cfg->divs.p_divisor != cfg->divs.h_divisor) - clkdiv |= S3C2412_CLKDIVN_PDIVN; - - s3c_freq_dbg("%s: div %08lx => %08lx\n", __func__, olddiv, clkdiv); - __raw_writel(clkdiv, S3C2410_CLKDIVN); - - clk_set_parent(armclk, cfg->divs.dvs ? hclk : fclk); -} - -static void s3c2412_cpufreq_setrefresh(struct s3c_cpufreq_config *cfg) -{ - struct s3c_cpufreq_board *board = cfg->board; - unsigned long refresh; - - s3c_freq_dbg("%s: refresh %u ns, hclk %lu\n", __func__, - board->refresh, cfg->freq.hclk); - - /* Reduce both the refresh time (in ns) and the frequency (in MHz) - * by 10 each 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 = (board->refresh / 10); - refresh *= (cfg->freq.hclk / 100); - refresh /= (1 * 1000 * 1000); /* 10^6 */ - - s3c_freq_dbg("%s: setting refresh 0x%08lx\n", __func__, refresh); - __raw_writel(refresh, S3C2412_REFRESH); -} - -/* set the default cpu frequency information, based on an 200MHz part - * as we have no other way of detecting the speed rating in software. - */ - -static struct s3c_cpufreq_info s3c2412_cpufreq_info = { - .max = { - .fclk = 200000000, - .hclk = 100000000, - .pclk = 50000000, - }, - - .latency = 5000000, /* 5ms */ - - .locktime_m = 150, - .locktime_u = 150, - .locktime_bits = 16, - - .name = "s3c2412", - .set_refresh = s3c2412_cpufreq_setrefresh, - .set_divs = s3c2412_cpufreq_setdivs, - .calc_divs = s3c2412_cpufreq_calcdivs, - - .calc_iotiming = s3c2412_iotiming_calc, - .set_iotiming = s3c2412_iotiming_set, - .get_iotiming = s3c2412_iotiming_get, - - .resume_clocks = s3c2412_setup_clocks, - - .debug_io_show = s3c_cpufreq_debugfs_call(s3c2412_iotiming_debugfs), -}; - -static int s3c2412_cpufreq_add(struct device *dev, - struct subsys_interface *sif) -{ - unsigned long fclk_rate; - - hclk = clk_get(NULL, "hclk"); - if (IS_ERR(hclk)) { - printk(KERN_ERR "%s: cannot find hclk clock\n", __func__); - return -ENOENT; - } - - fclk = clk_get(NULL, "fclk"); - if (IS_ERR(fclk)) { - printk(KERN_ERR "%s: cannot find fclk clock\n", __func__); - goto err_fclk; - } - - fclk_rate = clk_get_rate(fclk); - if (fclk_rate > 200000000) { - printk(KERN_INFO - "%s: fclk %ld MHz, assuming 266MHz capable part\n", - __func__, fclk_rate / 1000000); - s3c2412_cpufreq_info.max.fclk = 266000000; - s3c2412_cpufreq_info.max.hclk = 133000000; - s3c2412_cpufreq_info.max.pclk = 66000000; - } - - armclk = clk_get(NULL, "armclk"); - if (IS_ERR(armclk)) { - printk(KERN_ERR "%s: cannot find arm clock\n", __func__); - goto err_armclk; - } - - xtal = clk_get(NULL, "xtal"); - if (IS_ERR(xtal)) { - printk(KERN_ERR "%s: cannot find xtal clock\n", __func__); - goto err_xtal; - } - - return s3c_cpufreq_register(&s3c2412_cpufreq_info); - -err_xtal: - clk_put(armclk); -err_armclk: - clk_put(fclk); -err_fclk: - clk_put(hclk); - - return -ENOENT; -} - -static struct subsys_interface s3c2412_cpufreq_interface = { - .name = "s3c2412_cpufreq", - .subsys = &s3c2412_subsys, - .add_dev = s3c2412_cpufreq_add, -}; - -static int s3c2412_cpufreq_init(void) -{ - return subsys_interface_register(&s3c2412_cpufreq_interface); -} - -arch_initcall(s3c2412_cpufreq_init); |