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Diffstat (limited to 'arch/arm/plat-s3c24xx/s3c2440-cpufreq.c')
-rw-r--r--arch/arm/plat-s3c24xx/s3c2440-cpufreq.c311
1 files changed, 0 insertions, 311 deletions
diff --git a/arch/arm/plat-s3c24xx/s3c2440-cpufreq.c b/arch/arm/plat-s3c24xx/s3c2440-cpufreq.c
deleted file mode 100644
index 976002fb1b8f..000000000000
--- a/arch/arm/plat-s3c24xx/s3c2440-cpufreq.c
+++ /dev/null
@@ -1,311 +0,0 @@
-/* linux/arch/arm/plat-s3c24xx/s3c2440-cpufreq.c
- *
- * Copyright (c) 2006-2009 Simtec Electronics
- * http://armlinux.simtec.co.uk/
- * Ben Dooks <ben@simtec.co.uk>
- * Vincent Sanders <vince@simtec.co.uk>
- *
- * S3C2440/S3C2442 CPU Frequency scaling
- *
- * 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/sysdev.h>
-#include <linux/delay.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/io.h>
-
-#include <mach/hardware.h>
-
-#include <asm/mach/arch.h>
-#include <asm/mach/map.h>
-
-#include <mach/regs-clock.h>
-
-#include <plat/cpu.h>
-#include <plat/cpu-freq-core.h>
-#include <plat/clock.h>
-
-static struct clk *xtal;
-static struct clk *fclk;
-static struct clk *hclk;
-static struct clk *armclk;
-
-/* HDIV: 1, 2, 3, 4, 6, 8 */
-
-static inline int within_khz(unsigned long a, unsigned long b)
-{
- long diff = a - b;
-
- return (diff >= -1000 && diff <= 1000);
-}
-
-/**
- * s3c2440_cpufreq_calcdivs - calculate divider settings
- * @cfg: The cpu frequency settings.
- *
- * Calcualte the divider values for the given frequency settings
- * specified in @cfg. The values are stored in @cfg for later use
- * by the relevant set routine if the request settings can be reached.
- */
-int s3c2440_cpufreq_calcdivs(struct s3c_cpufreq_config *cfg)
-{
- unsigned int hdiv, pdiv;
- unsigned long hclk, fclk, armclk;
- unsigned long hclk_max;
-
- fclk = cfg->freq.fclk;
- armclk = cfg->freq.armclk;
- hclk_max = cfg->max.hclk;
-
- s3c_freq_dbg("%s: fclk is %lu, armclk %lu, max hclk %lu\n",
- __func__, fclk, armclk, hclk_max);
-
- if (armclk > fclk) {
- printk(KERN_WARNING "%s: armclk > fclk\n", __func__);
- armclk = fclk;
- }
-
- /* if we are in DVS, we need HCLK to be <= ARMCLK */
- if (armclk < fclk && armclk < hclk_max)
- hclk_max = armclk;
-
- for (hdiv = 1; hdiv < 9; hdiv++) {
- if (hdiv == 5 || hdiv == 7)
- hdiv++;
-
- hclk = (fclk / hdiv);
- if (hclk <= hclk_max || within_khz(hclk, hclk_max))
- break;
- }
-
- s3c_freq_dbg("%s: hclk %lu, div %d\n", __func__, hclk, hdiv);
-
- if (hdiv > 8)
- goto invalid;
-
- pdiv = (hclk > cfg->max.pclk) ? 2 : 1;
-
- if ((hclk / pdiv) > cfg->max.pclk)
- pdiv++;
-
- s3c_freq_dbg("%s: pdiv %d\n", __func__, pdiv);
-
- if (pdiv > 2)
- goto invalid;
-
- pdiv *= hdiv;
-
- /* calculate a valid armclk */
-
- if (armclk < hclk)
- armclk = hclk;
-
- /* if we're running armclk lower than fclk, this really means
- * that the system should go into dvs mode, which means that
- * armclk is connected to hclk. */
- if (armclk < fclk) {
- cfg->divs.dvs = 1;
- armclk = hclk;
- } else
- cfg->divs.dvs = 0;
-
- cfg->freq.armclk = armclk;
-
- /* store the result, and then return */
-
- cfg->divs.h_divisor = hdiv;
- cfg->divs.p_divisor = pdiv;
-
- return 0;
-
- invalid:
- return -EINVAL;
-}
-
-#define CAMDIVN_HCLK_HALF (S3C2440_CAMDIVN_HCLK3_HALF | \
- S3C2440_CAMDIVN_HCLK4_HALF)
-
-/**
- * s3c2440_cpufreq_setdivs - set the cpu frequency divider settings
- * @cfg: The cpu frequency settings.
- *
- * Set the divisors from the settings in @cfg, which where generated
- * during the calculation phase by s3c2440_cpufreq_calcdivs().
- */
-static void s3c2440_cpufreq_setdivs(struct s3c_cpufreq_config *cfg)
-{
- unsigned long clkdiv, camdiv;
-
- s3c_freq_dbg("%s: divsiors: h=%d, p=%d\n", __func__,
- cfg->divs.h_divisor, cfg->divs.p_divisor);
-
- clkdiv = __raw_readl(S3C2410_CLKDIVN);
- camdiv = __raw_readl(S3C2440_CAMDIVN);
-
- clkdiv &= ~(S3C2440_CLKDIVN_HDIVN_MASK | S3C2440_CLKDIVN_PDIVN);
- camdiv &= ~CAMDIVN_HCLK_HALF;
-
- switch (cfg->divs.h_divisor) {
- case 1:
- clkdiv |= S3C2440_CLKDIVN_HDIVN_1;
- break;
-
- case 2:
- clkdiv |= S3C2440_CLKDIVN_HDIVN_2;
- break;
-
- case 6:
- camdiv |= S3C2440_CAMDIVN_HCLK3_HALF;
- case 3:
- clkdiv |= S3C2440_CLKDIVN_HDIVN_3_6;
- break;
-
- case 8:
- camdiv |= S3C2440_CAMDIVN_HCLK4_HALF;
- case 4:
- clkdiv |= S3C2440_CLKDIVN_HDIVN_4_8;
- break;
-
- default:
- BUG(); /* we don't expect to get here. */
- }
-
- if (cfg->divs.p_divisor != cfg->divs.h_divisor)
- clkdiv |= S3C2440_CLKDIVN_PDIVN;
-
- /* todo - set pclk. */
-
- /* Write the divisors first with hclk intentionally halved so that
- * when we write clkdiv we will under-frequency instead of over. We
- * then make a short delay and remove the hclk halving if necessary.
- */
-
- __raw_writel(camdiv | CAMDIVN_HCLK_HALF, S3C2440_CAMDIVN);
- __raw_writel(clkdiv, S3C2410_CLKDIVN);
-
- ndelay(20);
- __raw_writel(camdiv, S3C2440_CAMDIVN);
-
- clk_set_parent(armclk, cfg->divs.dvs ? hclk : fclk);
-}
-
-static int run_freq_for(unsigned long max_hclk, unsigned long fclk,
- int *divs,
- struct cpufreq_frequency_table *table,
- size_t table_size)
-{
- unsigned long freq;
- int index = 0;
- int div;
-
- for (div = *divs; div > 0; div = *divs++) {
- freq = fclk / div;
-
- if (freq > max_hclk && div != 1)
- continue;
-
- freq /= 1000; /* table is in kHz */
- index = s3c_cpufreq_addfreq(table, index, table_size, freq);
- if (index < 0)
- break;
- }
-
- return index;
-}
-
-static int hclk_divs[] = { 1, 2, 3, 4, 6, 8, -1 };
-
-static int s3c2440_cpufreq_calctable(struct s3c_cpufreq_config *cfg,
- struct cpufreq_frequency_table *table,
- size_t table_size)
-{
- int ret;
-
- WARN_ON(cfg->info == NULL);
- WARN_ON(cfg->board == NULL);
-
- ret = run_freq_for(cfg->info->max.hclk,
- cfg->info->max.fclk,
- hclk_divs,
- table, table_size);
-
- s3c_freq_dbg("%s: returning %d\n", __func__, ret);
-
- return ret;
-}
-
-struct s3c_cpufreq_info s3c2440_cpufreq_info = {
- .max = {
- .fclk = 400000000,
- .hclk = 133333333,
- .pclk = 66666666,
- },
-
- .locktime_m = 300,
- .locktime_u = 300,
- .locktime_bits = 16,
-
- .name = "s3c244x",
- .calc_iotiming = s3c2410_iotiming_calc,
- .set_iotiming = s3c2410_iotiming_set,
- .get_iotiming = s3c2410_iotiming_get,
- .set_fvco = s3c2410_set_fvco,
-
- .set_refresh = s3c2410_cpufreq_setrefresh,
- .set_divs = s3c2440_cpufreq_setdivs,
- .calc_divs = s3c2440_cpufreq_calcdivs,
- .calc_freqtable = s3c2440_cpufreq_calctable,
-
- .resume_clocks = s3c244x_setup_clocks,
-
- .debug_io_show = s3c_cpufreq_debugfs_call(s3c2410_iotiming_debugfs),
-};
-
-static int s3c2440_cpufreq_add(struct sys_device *sysdev)
-{
- xtal = s3c_cpufreq_clk_get(NULL, "xtal");
- hclk = s3c_cpufreq_clk_get(NULL, "hclk");
- fclk = s3c_cpufreq_clk_get(NULL, "fclk");
- armclk = s3c_cpufreq_clk_get(NULL, "armclk");
-
- if (IS_ERR(xtal) || IS_ERR(hclk) || IS_ERR(fclk) || IS_ERR(armclk)) {
- printk(KERN_ERR "%s: failed to get clocks\n", __func__);
- return -ENOENT;
- }
-
- return s3c_cpufreq_register(&s3c2440_cpufreq_info);
-}
-
-static struct sysdev_driver s3c2440_cpufreq_driver = {
- .add = s3c2440_cpufreq_add,
-};
-
-static int s3c2440_cpufreq_init(void)
-{
- return sysdev_driver_register(&s3c2440_sysclass,
- &s3c2440_cpufreq_driver);
-}
-
-/* arch_initcall adds the clocks we need, so use subsys_initcall. */
-subsys_initcall(s3c2440_cpufreq_init);
-
-static struct sysdev_driver s3c2442_cpufreq_driver = {
- .add = s3c2440_cpufreq_add,
-};
-
-static int s3c2442_cpufreq_init(void)
-{
- return sysdev_driver_register(&s3c2442_sysclass,
- &s3c2442_cpufreq_driver);
-}
-
-subsys_initcall(s3c2442_cpufreq_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 05:32:53 +0000