diff options
Diffstat (limited to 'arch/arm/mach-s3c2440/mach-osiris-dvs.c')
| -rw-r--r-- | arch/arm/mach-s3c2440/mach-osiris-dvs.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/arch/arm/mach-s3c2440/mach-osiris-dvs.c b/arch/arm/mach-s3c2440/mach-osiris-dvs.c deleted file mode 100644 index ad2792dfbee..00000000000 --- a/arch/arm/mach-s3c2440/mach-osiris-dvs.c +++ /dev/null @@ -1,194 +0,0 @@ -/* linux/arch/arm/mach-s3c2440/mach-osiris-dvs.c - * - * Copyright (c) 2009 Simtec Electronics - * http://armlinux.simtec.co.uk/ - * Ben Dooks <ben@simtec.co.uk> - * - * Simtec Osiris Dynamic Voltage Scaling support. - * - * 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/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/cpufreq.h> -#include <linux/gpio.h> - -#include <linux/i2c/tps65010.h> - -#include <plat/cpu-freq.h> - -#define OSIRIS_GPIO_DVS S3C2410_GPB(5) - -static bool dvs_en; - -static void osiris_dvs_tps_setdvs(bool on) -{ - unsigned vregs1 = 0, vdcdc2 = 0; - - if (!on) { - vdcdc2 = TPS_VCORE_DISCH | TPS_LP_COREOFF; - vregs1 = TPS_LDO1_OFF; /* turn off in low-power mode */ - } - - dvs_en = on; - vdcdc2 |= TPS_VCORE_1_3V | TPS_VCORE_LP_1_0V; - vregs1 |= TPS_LDO2_ENABLE | TPS_LDO1_ENABLE; - - tps65010_config_vregs1(vregs1); - tps65010_config_vdcdc2(vdcdc2); -} - -static bool is_dvs(struct s3c_freq *f) -{ - /* at the moment, we assume ARMCLK = HCLK => DVS */ - return f->armclk == f->hclk; -} - -/* keep track of current state */ -static bool cur_dvs = false; - -static int osiris_dvs_notify(struct notifier_block *nb, - unsigned long val, void *data) -{ - struct cpufreq_freqs *cf = data; - struct s3c_cpufreq_freqs *freqs = to_s3c_cpufreq(cf); - bool old_dvs = is_dvs(&freqs->old); - bool new_dvs = is_dvs(&freqs->new); - int ret = 0; - - if (!dvs_en) - return 0; - - printk(KERN_DEBUG "%s: old %ld,%ld new %ld,%ld\n", __func__, - freqs->old.armclk, freqs->old.hclk, - freqs->new.armclk, freqs->new.hclk); - - switch (val) { - case CPUFREQ_PRECHANGE: - if (old_dvs & !new_dvs || - cur_dvs & !new_dvs) { - pr_debug("%s: exiting dvs\n", __func__); - cur_dvs = false; - gpio_set_value(OSIRIS_GPIO_DVS, 1); - } - break; - case CPUFREQ_POSTCHANGE: - if (!old_dvs & new_dvs || - !cur_dvs & new_dvs) { - pr_debug("entering dvs\n"); - cur_dvs = true; - gpio_set_value(OSIRIS_GPIO_DVS, 0); - } - break; - } - - return ret; -} - -static struct notifier_block osiris_dvs_nb = { - .notifier_call = osiris_dvs_notify, -}; - -static int __devinit osiris_dvs_probe(struct platform_device *pdev) -{ - int ret; - - dev_info(&pdev->dev, "initialising\n"); - - ret = gpio_request(OSIRIS_GPIO_DVS, "osiris-dvs"); - if (ret) { - dev_err(&pdev->dev, "cannot claim gpio\n"); - goto err_nogpio; - } - - /* start with dvs disabled */ - gpio_direction_output(OSIRIS_GPIO_DVS, 1); - - ret = cpufreq_register_notifier(&osiris_dvs_nb, - CPUFREQ_TRANSITION_NOTIFIER); - if (ret) { - dev_err(&pdev->dev, "failed to register with cpufreq\n"); - goto err_nofreq; - } - - osiris_dvs_tps_setdvs(true); - - return 0; - -err_nofreq: - gpio_free(OSIRIS_GPIO_DVS); - -err_nogpio: - return ret; -} - -static int __devexit osiris_dvs_remove(struct platform_device *pdev) -{ - dev_info(&pdev->dev, "exiting\n"); - - /* disable any current dvs */ - gpio_set_value(OSIRIS_GPIO_DVS, 1); - osiris_dvs_tps_setdvs(false); - - cpufreq_unregister_notifier(&osiris_dvs_nb, - CPUFREQ_TRANSITION_NOTIFIER); - - gpio_free(OSIRIS_GPIO_DVS); - - return 0; -} - -/* the CONFIG_PM block is so small, it isn't worth actaully compiling it - * out if the configuration isn't set. */ - -static int osiris_dvs_suspend(struct device *dev) -{ - gpio_set_value(OSIRIS_GPIO_DVS, 1); - osiris_dvs_tps_setdvs(false); - cur_dvs = false; - - return 0; -} - -static int osiris_dvs_resume(struct device *dev) -{ - osiris_dvs_tps_setdvs(true); - return 0; -} - -static const struct dev_pm_ops osiris_dvs_pm = { - .suspend = osiris_dvs_suspend, - .resume = osiris_dvs_resume, -}; - -static struct platform_driver osiris_dvs_driver = { - .probe = osiris_dvs_probe, - .remove = __devexit_p(osiris_dvs_remove), - .driver = { - .name = "osiris-dvs", - .owner = THIS_MODULE, - .pm = &osiris_dvs_pm, - }, -}; - -static int __init osiris_dvs_init(void) -{ - return platform_driver_register(&osiris_dvs_driver); -} - -static void __exit osiris_dvs_exit(void) -{ - platform_driver_unregister(&osiris_dvs_driver); -} - -module_init(osiris_dvs_init); -module_exit(osiris_dvs_exit); - -MODULE_DESCRIPTION("Simtec OSIRIS DVS support"); -MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:osiris-dvs"); |