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author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-15 04:48:14 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-15 04:48:14 +0400 |
commit | 2ca7d674d7ab2220707b2ada0b690c0e7c95e7ac (patch) | |
tree | 9c0927ed1d540e5fd704c1f82689870786514655 /arch/arm/mach-s3c2410/cpu-freq.c | |
parent | 2195d2818c37bdf263865f1e9effccdd9fc5f9d4 (diff) | |
parent | 87d721ad7a37b7650dd710c88dd5c6a5bf9fe996 (diff) | |
download | linux-2ca7d674d7ab2220707b2ada0b690c0e7c95e7ac.tar.xz |
Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm
* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (257 commits)
[ARM] Update mach-types
ARM: 5636/1: Move vendor enum to AMBA include
ARM: Fix pfn_valid() for sparse memory
[ARM] orion5x: Add LaCie NAS 2Big Network support
[ARM] pxa/sharpsl_pm: zaurus c3000 aka spitz: fix resume
ARM: 5686/1: at91: Correct AC97 reset line in at91sam9263ek board
ARM: 5640/1: This patch modifies the support of AC97 on the at91sam9263 ek board
ARM: 5689/1: Update default config of HP Jornada 700-series machines
ARM: 5691/1: fix cache aliasing issues between kmap() and kmap_atomic() with highmem
ARM: 5688/1: ks8695_serial: disable_irq() lockup
ARM: 5687/1: fix an oops with highmem
ARM: 5684/1: Add nuc960 platform to w90x900
ARM: 5683/1: Add nuc950 platform to w90x900
ARM: 5682/1: Add cpu.c and dev.c and modify some files of w90p910 platform
ARM: 5626/1: add suspend/resume functions to amba-pl011 serial driver
ARM: 5625/1: fix hard coded 4K resource size in amba bus detection
MMC: MMCI: convert realview MMC to use gpiolib
ARM: 5685/1: Make MMCI driver compile without gpiolib
ARM: implement highpte
ARM: Show FIQ in /proc/interrupts on CONFIG_FIQ
...
Fix up trivial conflict in arch/arm/kernel/signal.c.
It was due to the TIF_NOTIFY_RESUME addition in commit d0420c83f ("KEYS:
Extend TIF_NOTIFY_RESUME to (almost) all architectures") and follow-ups.
Diffstat (limited to 'arch/arm/mach-s3c2410/cpu-freq.c')
-rw-r--r-- | arch/arm/mach-s3c2410/cpu-freq.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c2410/cpu-freq.c b/arch/arm/mach-s3c2410/cpu-freq.c new file mode 100644 index 000000000000..9d1186877d08 --- /dev/null +++ b/arch/arm/mach-s3c2410/cpu-freq.c @@ -0,0 +1,159 @@ +/* linux/arch/arm/mach-s3c2410/cpu-freq.c + * + * 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/sysdev.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 sys_device *sysdev) +{ + return s3c_cpufreq_register(&s3c2410_cpufreq_info); +} + +static struct sysdev_driver s3c2410_cpufreq_driver = { + .add = s3c2410_cpufreq_add, +}; + +static int __init s3c2410_cpufreq_init(void) +{ + return sysdev_driver_register(&s3c2410_sysclass, + &s3c2410_cpufreq_driver); +} + +arch_initcall(s3c2410_cpufreq_init); + +static int s3c2410a_cpufreq_add(struct sys_device *sysdev) +{ + /* 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(sysdev); +} + +static struct sysdev_driver s3c2410a_cpufreq_driver = { + .add = s3c2410a_cpufreq_add, +}; + +static int __init s3c2410a_cpufreq_init(void) +{ + return sysdev_driver_register(&s3c2410a_sysclass, + &s3c2410a_cpufreq_driver); +} + +arch_initcall(s3c2410a_cpufreq_init); |