![Linus Walleij](/assets/img/avatar_default.png)
When refactoring and breaking out the includes for the machine-specific GPIO configuration, two files were created in <linux/platform_data/gpio-samsung-s3c[24|64]xx.h>, but as that namespace shall be used for defining data exchanged between machines and drivers, using it for these broad macros and config settings is wrong. Move the headers back into the machine-local <mach/gpio-samsung.h> file and think about the next step. Reported-by: Arnd Bergmann <arnd@arndb.de> Cc: Tomasz Figa <tomasz.figa@gmail.com> Cc: Sylwester Nawrocki <sylvester.nawrocki@gmail.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: linux-samsung-soc@vger.kernel.org Acked-by: Mark Brown <broonie@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
185 lines
4 KiB
C
185 lines
4 KiB
C
/* linux/arch/arm/mach-s3c2440/mach-osiris-dvs.c
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*
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* Copyright (c) 2009 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Simtec Osiris Dynamic Voltage Scaling support.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/cpufreq.h>
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#include <linux/gpio.h>
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#include <linux/i2c/tps65010.h>
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#include <plat/cpu-freq.h>
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#include <mach/gpio-samsung.h>
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#define OSIRIS_GPIO_DVS S3C2410_GPB(5)
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static bool dvs_en;
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static void osiris_dvs_tps_setdvs(bool on)
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{
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unsigned vregs1 = 0, vdcdc2 = 0;
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if (!on) {
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vdcdc2 = TPS_VCORE_DISCH | TPS_LP_COREOFF;
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vregs1 = TPS_LDO1_OFF; /* turn off in low-power mode */
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}
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dvs_en = on;
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vdcdc2 |= TPS_VCORE_1_3V | TPS_VCORE_LP_1_0V;
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vregs1 |= TPS_LDO2_ENABLE | TPS_LDO1_ENABLE;
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tps65010_config_vregs1(vregs1);
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tps65010_config_vdcdc2(vdcdc2);
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}
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static bool is_dvs(struct s3c_freq *f)
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{
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/* at the moment, we assume ARMCLK = HCLK => DVS */
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return f->armclk == f->hclk;
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}
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/* keep track of current state */
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static bool cur_dvs = false;
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static int osiris_dvs_notify(struct notifier_block *nb,
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unsigned long val, void *data)
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{
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struct cpufreq_freqs *cf = data;
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struct s3c_cpufreq_freqs *freqs = to_s3c_cpufreq(cf);
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bool old_dvs = is_dvs(&freqs->old);
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bool new_dvs = is_dvs(&freqs->new);
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int ret = 0;
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if (!dvs_en)
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return 0;
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printk(KERN_DEBUG "%s: old %ld,%ld new %ld,%ld\n", __func__,
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freqs->old.armclk, freqs->old.hclk,
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freqs->new.armclk, freqs->new.hclk);
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switch (val) {
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case CPUFREQ_PRECHANGE:
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if (old_dvs & !new_dvs ||
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cur_dvs & !new_dvs) {
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pr_debug("%s: exiting dvs\n", __func__);
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cur_dvs = false;
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gpio_set_value(OSIRIS_GPIO_DVS, 1);
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}
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break;
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case CPUFREQ_POSTCHANGE:
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if (!old_dvs & new_dvs ||
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!cur_dvs & new_dvs) {
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pr_debug("entering dvs\n");
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cur_dvs = true;
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gpio_set_value(OSIRIS_GPIO_DVS, 0);
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}
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break;
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}
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return ret;
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}
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static struct notifier_block osiris_dvs_nb = {
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.notifier_call = osiris_dvs_notify,
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};
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static int osiris_dvs_probe(struct platform_device *pdev)
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{
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int ret;
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dev_info(&pdev->dev, "initialising\n");
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ret = gpio_request(OSIRIS_GPIO_DVS, "osiris-dvs");
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if (ret) {
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dev_err(&pdev->dev, "cannot claim gpio\n");
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goto err_nogpio;
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}
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/* start with dvs disabled */
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gpio_direction_output(OSIRIS_GPIO_DVS, 1);
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ret = cpufreq_register_notifier(&osiris_dvs_nb,
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CPUFREQ_TRANSITION_NOTIFIER);
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if (ret) {
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dev_err(&pdev->dev, "failed to register with cpufreq\n");
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goto err_nofreq;
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}
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osiris_dvs_tps_setdvs(true);
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return 0;
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err_nofreq:
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gpio_free(OSIRIS_GPIO_DVS);
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err_nogpio:
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return ret;
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}
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static int osiris_dvs_remove(struct platform_device *pdev)
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{
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dev_info(&pdev->dev, "exiting\n");
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/* disable any current dvs */
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gpio_set_value(OSIRIS_GPIO_DVS, 1);
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osiris_dvs_tps_setdvs(false);
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cpufreq_unregister_notifier(&osiris_dvs_nb,
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CPUFREQ_TRANSITION_NOTIFIER);
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gpio_free(OSIRIS_GPIO_DVS);
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return 0;
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}
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/* the CONFIG_PM block is so small, it isn't worth actaully compiling it
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* out if the configuration isn't set. */
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static int osiris_dvs_suspend(struct device *dev)
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{
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gpio_set_value(OSIRIS_GPIO_DVS, 1);
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osiris_dvs_tps_setdvs(false);
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cur_dvs = false;
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return 0;
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}
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static int osiris_dvs_resume(struct device *dev)
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{
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osiris_dvs_tps_setdvs(true);
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return 0;
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}
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static const struct dev_pm_ops osiris_dvs_pm = {
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.suspend = osiris_dvs_suspend,
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.resume = osiris_dvs_resume,
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};
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static struct platform_driver osiris_dvs_driver = {
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.probe = osiris_dvs_probe,
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.remove = osiris_dvs_remove,
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.driver = {
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.name = "osiris-dvs",
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.owner = THIS_MODULE,
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.pm = &osiris_dvs_pm,
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},
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};
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module_platform_driver(osiris_dvs_driver);
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MODULE_DESCRIPTION("Simtec OSIRIS DVS support");
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:osiris-dvs");
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