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path: root/drivers/cpufreq/s3c2410-cpufreq.c
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Diffstat (limited to 'drivers/cpufreq/s3c2410-cpufreq.c')
-rw-r--r--drivers/cpufreq/s3c2410-cpufreq.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/cpufreq/s3c2410-cpufreq.c b/drivers/cpufreq/s3c2410-cpufreq.c
new file mode 100644
index 000000000000..cfa0dd8723ec
--- /dev/null
+++ b/drivers/cpufreq/s3c2410-cpufreq.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2006-2008 Simtec Electronics
+ * http://armlinux.simtec.co.uk/
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2410 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/device.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 <plat/cpu.h>
+#include <plat/clock.h>
+#include <plat/cpu-freq-core.h>
+
+/* Note, 2410A has an extra mode for 1:4:4 ratio, bit 2 of CLKDIV */
+
+static void s3c2410_cpufreq_setdivs(struct s3c_cpufreq_config *cfg)
+{
+ u32 clkdiv = 0;
+
+ if (cfg->divs.h_divisor == 2)
+ clkdiv |= S3C2410_CLKDIVN_HDIVN;
+
+ if (cfg->divs.p_divisor != cfg->divs.h_divisor)
+ clkdiv |= S3C2410_CLKDIVN_PDIVN;
+
+ __raw_writel(clkdiv, S3C2410_CLKDIVN);
+}
+
+static int s3c2410_cpufreq_calcdivs(struct s3c_cpufreq_config *cfg)
+{
+ unsigned long hclk, fclk, pclk;
+ unsigned int hdiv, pdiv;
+ unsigned long hclk_max;
+
+ fclk = cfg->freq.fclk;
+ hclk_max = cfg->max.hclk;
+
+ cfg->freq.armclk = fclk;
+
+ s3c_freq_dbg("%s: fclk is %lu, max hclk %lu\n",
+ __func__, fclk, hclk_max);
+
+ hdiv = (fclk > cfg->max.hclk) ? 2 : 1;
+ hclk = fclk / hdiv;
+
+ if (hclk > cfg->max.hclk) {
+ s3c_freq_dbg("%s: hclk too big\n", __func__);
+ return -EINVAL;
+ }
+
+ pdiv = (hclk > cfg->max.pclk) ? 2 : 1;
+ pclk = hclk / pdiv;
+
+ if (pclk > cfg->max.pclk) {
+ s3c_freq_dbg("%s: pclk too big\n", __func__);
+ return -EINVAL;
+ }
+
+ pdiv *= hdiv;
+
+ /* record the result */
+ cfg->divs.p_divisor = pdiv;
+ cfg->divs.h_divisor = hdiv;
+
+ return 0;
+}
+
+static struct s3c_cpufreq_info s3c2410_cpufreq_info = {
+ .max = {
+ .fclk = 200000000,
+ .hclk = 100000000,
+ .pclk = 50000000,
+ },
+
+ /* transition latency is about 5ms worst-case, so
+ * set 10ms to be sure */
+ .latency = 10000000,
+
+ .locktime_m = 150,
+ .locktime_u = 150,
+ .locktime_bits = 12,
+
+ .need_pll = 1,
+
+ .name = "s3c2410",
+ .calc_iotiming = s3c2410_iotiming_calc,
+ .set_iotiming = s3c2410_iotiming_set,
+ .get_iotiming = s3c2410_iotiming_get,
+ .resume_clocks = s3c2410_setup_clocks,
+
+ .set_fvco = s3c2410_set_fvco,
+ .set_refresh = s3c2410_cpufreq_setrefresh,
+ .set_divs = s3c2410_cpufreq_setdivs,
+ .calc_divs = s3c2410_cpufreq_calcdivs,
+
+ .debug_io_show = s3c_cpufreq_debugfs_call(s3c2410_iotiming_debugfs),
+};
+
+static int s3c2410_cpufreq_add(struct device *dev,
+ struct subsys_interface *sif)
+{
+ return s3c_cpufreq_register(&s3c2410_cpufreq_info);
+}
+
+static struct subsys_interface s3c2410_cpufreq_interface = {
+ .name = "s3c2410_cpufreq",
+ .subsys = &s3c2410_subsys,
+ .add_dev = s3c2410_cpufreq_add,
+};
+
+static int __init s3c2410_cpufreq_init(void)
+{
+ return subsys_interface_register(&s3c2410_cpufreq_interface);
+}
+arch_initcall(s3c2410_cpufreq_init);
+
+static int s3c2410a_cpufreq_add(struct device *dev,
+ struct subsys_interface *sif)
+{
+ /* alter the maximum freq settings for S3C2410A. If a board knows
+ * it only has a maximum of 200, then it should register its own
+ * limits. */
+
+ s3c2410_cpufreq_info.max.fclk = 266000000;
+ s3c2410_cpufreq_info.max.hclk = 133000000;
+ s3c2410_cpufreq_info.max.pclk = 66500000;
+ s3c2410_cpufreq_info.name = "s3c2410a";
+
+ return s3c2410_cpufreq_add(dev, sif);
+}
+
+static struct subsys_interface s3c2410a_cpufreq_interface = {
+ .name = "s3c2410a_cpufreq",
+ .subsys = &s3c2410a_subsys,
+ .add_dev = s3c2410a_cpufreq_add,
+};
+
+static int __init s3c2410a_cpufreq_init(void)
+{
+ return subsys_interface_register(&s3c2410a_cpufreq_interface);
+}
+arch_initcall(s3c2410a_cpufreq_init);