pwm: Move PUV3 PWM driver to PWM framework
This commit moves the driver to drivers/pwm and converts it to the new PWM framework. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Qin Rui <qinrui@mprc.pku.edu.cn> Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
This commit is contained in:
Thierry Reding
parent
5384e27317
commit
79c11b6fa0
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@ -20,9 +20,6 @@ config UNICORE32
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designs licensed by PKUnity Ltd.
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Please see web page at <http://www.pkunity.com/>.
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config HAVE_PWM
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bool
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config GENERIC_GPIO
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def_bool y
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@ -105,7 +102,8 @@ config PUV3_DB0913
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config PUV3_NB0916
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bool "NetBook board (0916)"
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select HAVE_PWM
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select PWM
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select PWM_PUV3
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config PUV3_SMW0919
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bool "Security Mini-Workstation board (0919)"
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@ -219,12 +217,6 @@ config PUV3_GPIO
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select GPIO_SYSFS if EXPERIMENTAL
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default y
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config PUV3_PWM
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tristate
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default BACKLIGHT_PWM
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help
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Enable support for NB0916 PWM controllers
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if PUV3_NB0916
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menu "PKUnity NetBook-0916 Features"
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@ -16,7 +16,6 @@ obj-$(CONFIG_UNICORE_FPU_F64) += fpu-ucf64.o
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obj-$(CONFIG_ARCH_PUV3) += clock.o irq.o time.o
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obj-$(CONFIG_PUV3_GPIO) += gpio.o
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obj-$(CONFIG_PUV3_PWM) += pwm.o
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obj-$(CONFIG_PUV3_PM) += pm.o sleep.o
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obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate_asm.o
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@ -1,219 +0,0 @@
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/*
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* linux/arch/unicore32/kernel/pwm.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
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* Copyright (C) 2001-2010 Guan Xuetao
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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/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/pwm.h>
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#include <asm/div64.h>
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#include <mach/hardware.h>
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struct pwm_device {
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struct list_head node;
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struct platform_device *pdev;
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void __iomem *base;
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const char *label;
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struct clk *clk;
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int clk_enabled;
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unsigned int use_count;
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unsigned int pwm_id;
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};
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/*
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* period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE
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* duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE
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*/
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int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
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{
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unsigned long long c;
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unsigned long period_cycles, prescale, pv, dc;
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if (pwm == NULL || period_ns == 0 || duty_ns > period_ns)
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return -EINVAL;
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c = clk_get_rate(pwm->clk);
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c = c * period_ns;
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do_div(c, 1000000000);
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period_cycles = c;
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if (period_cycles < 1)
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period_cycles = 1;
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prescale = (period_cycles - 1) / 1024;
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pv = period_cycles / (prescale + 1) - 1;
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if (prescale > 63)
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return -EINVAL;
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if (duty_ns == period_ns)
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dc = OST_PWMDCCR_FDCYCLE;
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else
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dc = (pv + 1) * duty_ns / period_ns;
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/* NOTE: the clock to PWM has to be enabled first
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* before writing to the registers
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*/
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clk_enable(pwm->clk);
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writel(prescale, pwm->base + OST_PWM_PWCR);
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writel(pv - dc, pwm->base + OST_PWM_DCCR);
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writel(pv, pwm->base + OST_PWM_PCR);
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clk_disable(pwm->clk);
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return 0;
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}
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EXPORT_SYMBOL(pwm_config);
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int pwm_enable(struct pwm_device *pwm)
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{
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int rc = 0;
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if (!pwm->clk_enabled) {
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rc = clk_enable(pwm->clk);
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if (!rc)
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pwm->clk_enabled = 1;
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}
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return rc;
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}
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EXPORT_SYMBOL(pwm_enable);
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void pwm_disable(struct pwm_device *pwm)
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{
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if (pwm->clk_enabled) {
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clk_disable(pwm->clk);
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pwm->clk_enabled = 0;
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}
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}
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EXPORT_SYMBOL(pwm_disable);
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static DEFINE_MUTEX(pwm_lock);
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static LIST_HEAD(pwm_list);
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struct pwm_device *pwm_request(int pwm_id, const char *label)
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{
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struct pwm_device *pwm;
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int found = 0;
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mutex_lock(&pwm_lock);
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list_for_each_entry(pwm, &pwm_list, node) {
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if (pwm->pwm_id == pwm_id) {
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found = 1;
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break;
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}
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}
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if (found) {
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if (pwm->use_count == 0) {
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pwm->use_count++;
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pwm->label = label;
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} else
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pwm = ERR_PTR(-EBUSY);
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} else
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pwm = ERR_PTR(-ENOENT);
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mutex_unlock(&pwm_lock);
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return pwm;
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}
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EXPORT_SYMBOL(pwm_request);
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void pwm_free(struct pwm_device *pwm)
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{
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mutex_lock(&pwm_lock);
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if (pwm->use_count) {
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pwm->use_count--;
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pwm->label = NULL;
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} else
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pr_warning("PWM device already freed\n");
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mutex_unlock(&pwm_lock);
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}
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EXPORT_SYMBOL(pwm_free);
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static inline void __add_pwm(struct pwm_device *pwm)
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{
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mutex_lock(&pwm_lock);
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list_add_tail(&pwm->node, &pwm_list);
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mutex_unlock(&pwm_lock);
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}
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static int __devinit pwm_probe(struct platform_device *pdev)
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{
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struct pwm_device *pwm;
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struct resource *r;
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pwm = devm_kzalloc(&pdev->dev, sizeof(struct pwm_device), GFP_KERNEL);
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if (pwm == NULL) {
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dev_err(&pdev->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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pwm->clk = devm_clk_get(&pdev->dev, "OST_CLK");
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if (IS_ERR(pwm->clk))
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return PTR_ERR(pwm->clk);
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pwm->clk_enabled = 0;
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pwm->use_count = 0;
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pwm->pwm_id = pdev->id;
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pwm->pdev = pdev;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (r == NULL) {
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dev_err(&pdev->dev, "no memory resource defined\n");
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return -ENODEV;
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}
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pwm->base = devm_request_and_ioremap(&pdev->dev, r);
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if (pwm->base == NULL)
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return -EADDRNOTAVAIL;
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__add_pwm(pwm);
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platform_set_drvdata(pdev, pwm);
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return 0;
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}
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static int __devexit pwm_remove(struct platform_device *pdev)
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{
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struct pwm_device *pwm;
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pwm = platform_get_drvdata(pdev);
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if (pwm == NULL)
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return -ENODEV;
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mutex_lock(&pwm_lock);
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list_del(&pwm->node);
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mutex_unlock(&pwm_lock);
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return 0;
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}
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static struct platform_driver puv3_pwm_driver = {
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.driver = {
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.name = "PKUnity-v3-PWM",
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},
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.probe = pwm_probe,
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.remove = __devexit_p(pwm_remove),
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};
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module_platform_driver(puv3_pwm_driver);
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MODULE_LICENSE("GPL v2");
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@ -1,6 +1,6 @@
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menuconfig PWM
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bool "Pulse-Width Modulation (PWM) Support"
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depends on !MACH_JZ4740 && !PUV3_PWM
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depends on !MACH_JZ4740
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help
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Generic Pulse-Width Modulation (PWM) support.
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@ -76,6 +76,15 @@ config PWM_MXS
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To compile this driver as a module, choose M here: the module
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will be called pwm-mxs.
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config PWM_PUV3
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tristate "PKUnity NetBook-0916 PWM support"
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depends on ARCH_PUV3
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help
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Generic PWM framework driver for PKUnity NetBook-0916.
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To compile this driver as a module, choose M here: the module
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will be called pwm-puv3.
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config PWM_PXA
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tristate "PXA PWM support"
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depends on ARCH_PXA
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@ -4,6 +4,7 @@ obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
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obj-$(CONFIG_PWM_IMX) += pwm-imx.o
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obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o
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obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
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obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
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obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
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obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
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obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
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@ -0,0 +1,161 @@
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/*
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* linux/arch/unicore32/kernel/pwm.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
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* Copyright (C) 2001-2010 Guan Xuetao
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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/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/pwm.h>
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#include <asm/div64.h>
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#include <mach/hardware.h>
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struct puv3_pwm_chip {
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struct pwm_chip chip;
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void __iomem *base;
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struct clk *clk;
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bool enabled;
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};
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static inline struct puv3_pwm_chip *to_puv3(struct pwm_chip *chip)
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{
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return container_of(chip, struct puv3_pwm_chip, chip);
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}
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/*
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* period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE
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* duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE
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*/
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static int puv3_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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int duty_ns, int period_ns)
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{
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unsigned long period_cycles, prescale, pv, dc;
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struct puv3_pwm_chip *puv3 = to_puv3(chip);
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unsigned long long c;
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c = clk_get_rate(puv3->clk);
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c = c * period_ns;
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do_div(c, 1000000000);
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period_cycles = c;
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if (period_cycles < 1)
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period_cycles = 1;
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prescale = (period_cycles - 1) / 1024;
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pv = period_cycles / (prescale + 1) - 1;
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if (prescale > 63)
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return -EINVAL;
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if (duty_ns == period_ns)
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dc = OST_PWMDCCR_FDCYCLE;
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else
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dc = (pv + 1) * duty_ns / period_ns;
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/*
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* NOTE: the clock to PWM has to be enabled first
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* before writing to the registers
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*/
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clk_prepare_enable(puv3->clk);
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writel(prescale, puv3->base + OST_PWM_PWCR);
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writel(pv - dc, puv3->base + OST_PWM_DCCR);
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writel(pv, puv3->base + OST_PWM_PCR);
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clk_disable_unprepare(puv3->clk);
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return 0;
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}
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static int puv3_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct puv3_pwm_chip *puv3 = to_puv3(chip);
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return clk_prepare_enable(puv3->clk);
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}
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static void puv3_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct puv3_pwm_chip *puv3 = to_puv3(chip);
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clk_disable_unprepare(puv3->clk);
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}
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static const struct pwm_ops puv3_pwm_ops = {
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.config = puv3_pwm_config,
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.enable = puv3_pwm_enable,
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.disable = puv3_pwm_disable,
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.owner = THIS_MODULE,
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};
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static int __devinit pwm_probe(struct platform_device *pdev)
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{
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struct puv3_pwm_chip *puv3;
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struct resource *r;
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int ret;
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puv3 = devm_kzalloc(&pdev->dev, sizeof(*puv3), GFP_KERNEL);
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if (puv3 == NULL) {
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dev_err(&pdev->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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puv3->clk = devm_clk_get(&pdev->dev, "OST_CLK");
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if (IS_ERR(puv3->clk))
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return PTR_ERR(puv3->clk);
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (r == NULL) {
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dev_err(&pdev->dev, "no memory resource defined\n");
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return -ENODEV;
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}
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puv3->base = devm_request_and_ioremap(&pdev->dev, r);
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if (puv3->base == NULL)
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return -EADDRNOTAVAIL;
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puv3->chip.dev = &pdev->dev;
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puv3->chip.ops = &puv3_pwm_ops;
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puv3->chip.base = -1;
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puv3->chip.npwm = 1;
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ret = pwmchip_add(&puv3->chip);
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if (ret < 0) {
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dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, puv3);
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return 0;
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}
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static int __devexit pwm_remove(struct platform_device *pdev)
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{
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struct puv3_pwm_chip *puv3 = platform_get_drvdata(pdev);
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return pwmchip_remove(&puv3->chip);
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}
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static struct platform_driver puv3_pwm_driver = {
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.driver = {
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.name = "PKUnity-v3-PWM",
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},
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.probe = pwm_probe,
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.remove = __devexit_p(pwm_remove),
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};
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module_platform_driver(puv3_pwm_driver);
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MODULE_LICENSE("GPL v2");
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