diff options
author | Thierry Reding <thierry.reding@avionic-design.de> | 2012-08-31 08:29:24 +0200 |
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committer | Thierry Reding <thierry.reding@avionic-design.de> | 2012-10-05 20:56:41 +0200 |
commit | 79c11b6fa0b225ac165e79e821d50e70f563645f (patch) | |
tree | 05a7b6a2a87f05780b2a12a2e821c44336d73e75 /arch | |
parent | 5384e27317016bd30aa7a7a7513f76ce7caa3b09 (diff) | |
download | linux-79c11b6fa0b225ac165e79e821d50e70f563645f.tar.bz2 |
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>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/unicore32/Kconfig | 12 | ||||
-rw-r--r-- | arch/unicore32/kernel/Makefile | 1 | ||||
-rw-r--r-- | arch/unicore32/kernel/pwm.c | 219 |
3 files changed, 2 insertions, 230 deletions
diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig index b0a47433341e..91e203735643 100644 --- a/arch/unicore32/Kconfig +++ b/arch/unicore32/Kconfig @@ -20,9 +20,6 @@ config UNICORE32 designs licensed by PKUnity Ltd. Please see web page at <http://www.pkunity.com/>. -config HAVE_PWM - bool - config GENERIC_GPIO def_bool y @@ -105,7 +102,8 @@ config PUV3_DB0913 config PUV3_NB0916 bool "NetBook board (0916)" - select HAVE_PWM + select PWM + select PWM_PUV3 config PUV3_SMW0919 bool "Security Mini-Workstation board (0919)" @@ -219,12 +217,6 @@ config PUV3_GPIO select GPIO_SYSFS if EXPERIMENTAL default y -config PUV3_PWM - tristate - default BACKLIGHT_PWM - help - Enable support for NB0916 PWM controllers - if PUV3_NB0916 menu "PKUnity NetBook-0916 Features" diff --git a/arch/unicore32/kernel/Makefile b/arch/unicore32/kernel/Makefile index 324010156958..fa497e0efe5a 100644 --- a/arch/unicore32/kernel/Makefile +++ b/arch/unicore32/kernel/Makefile @@ -16,7 +16,6 @@ obj-$(CONFIG_UNICORE_FPU_F64) += fpu-ucf64.o obj-$(CONFIG_ARCH_PUV3) += clock.o irq.o time.o obj-$(CONFIG_PUV3_GPIO) += gpio.o -obj-$(CONFIG_PUV3_PWM) += pwm.o obj-$(CONFIG_PUV3_PM) += pm.o sleep.o obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate_asm.o diff --git a/arch/unicore32/kernel/pwm.c b/arch/unicore32/kernel/pwm.c deleted file mode 100644 index 724e8603120b..000000000000 --- a/arch/unicore32/kernel/pwm.c +++ /dev/null @@ -1,219 +0,0 @@ -/* - * linux/arch/unicore32/kernel/pwm.c - * - * Code specific to PKUnity SoC and UniCore ISA - * - * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> - * Copyright (C) 2001-2010 Guan Xuetao - * - * 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/module.h> -#include <linux/kernel.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/pwm.h> - -#include <asm/div64.h> -#include <mach/hardware.h> - -struct pwm_device { - struct list_head node; - struct platform_device *pdev; - - void __iomem *base; - - const char *label; - struct clk *clk; - int clk_enabled; - - unsigned int use_count; - unsigned int pwm_id; -}; - -/* - * period_ns = 10^9 * (PRESCALE + 1) * (PV + 1) / PWM_CLK_RATE - * duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE - */ -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) -{ - unsigned long long c; - unsigned long period_cycles, prescale, pv, dc; - - if (pwm == NULL || period_ns == 0 || duty_ns > period_ns) - return -EINVAL; - - c = clk_get_rate(pwm->clk); - c = c * period_ns; - do_div(c, 1000000000); - period_cycles = c; - - if (period_cycles < 1) - period_cycles = 1; - prescale = (period_cycles - 1) / 1024; - pv = period_cycles / (prescale + 1) - 1; - - if (prescale > 63) - return -EINVAL; - - if (duty_ns == period_ns) - dc = OST_PWMDCCR_FDCYCLE; - else - dc = (pv + 1) * duty_ns / period_ns; - - /* NOTE: the clock to PWM has to be enabled first - * before writing to the registers - */ - clk_enable(pwm->clk); - - writel(prescale, pwm->base + OST_PWM_PWCR); - writel(pv - dc, pwm->base + OST_PWM_DCCR); - writel(pv, pwm->base + OST_PWM_PCR); - - clk_disable(pwm->clk); - - return 0; -} -EXPORT_SYMBOL(pwm_config); - -int pwm_enable(struct pwm_device *pwm) -{ - int rc = 0; - - if (!pwm->clk_enabled) { - rc = clk_enable(pwm->clk); - if (!rc) - pwm->clk_enabled = 1; - } - return rc; -} -EXPORT_SYMBOL(pwm_enable); - -void pwm_disable(struct pwm_device *pwm) -{ - if (pwm->clk_enabled) { - clk_disable(pwm->clk); - pwm->clk_enabled = 0; - } -} -EXPORT_SYMBOL(pwm_disable); - -static DEFINE_MUTEX(pwm_lock); -static LIST_HEAD(pwm_list); - -struct pwm_device *pwm_request(int pwm_id, const char *label) -{ - struct pwm_device *pwm; - int found = 0; - - mutex_lock(&pwm_lock); - - list_for_each_entry(pwm, &pwm_list, node) { - if (pwm->pwm_id == pwm_id) { - found = 1; - break; - } - } - - if (found) { - if (pwm->use_count == 0) { - pwm->use_count++; - pwm->label = label; - } else - pwm = ERR_PTR(-EBUSY); - } else - pwm = ERR_PTR(-ENOENT); - - mutex_unlock(&pwm_lock); - return pwm; -} -EXPORT_SYMBOL(pwm_request); - -void pwm_free(struct pwm_device *pwm) -{ - mutex_lock(&pwm_lock); - - if (pwm->use_count) { - pwm->use_count--; - pwm->label = NULL; - } else - pr_warning("PWM device already freed\n"); - - mutex_unlock(&pwm_lock); -} -EXPORT_SYMBOL(pwm_free); - -static inline void __add_pwm(struct pwm_device *pwm) -{ - mutex_lock(&pwm_lock); - list_add_tail(&pwm->node, &pwm_list); - mutex_unlock(&pwm_lock); -} - -static int __devinit pwm_probe(struct platform_device *pdev) -{ - struct pwm_device *pwm; - struct resource *r; - - pwm = devm_kzalloc(&pdev->dev, sizeof(struct pwm_device), GFP_KERNEL); - if (pwm == NULL) { - dev_err(&pdev->dev, "failed to allocate memory\n"); - return -ENOMEM; - } - - pwm->clk = devm_clk_get(&pdev->dev, "OST_CLK"); - if (IS_ERR(pwm->clk)) - return PTR_ERR(pwm->clk); - - pwm->clk_enabled = 0; - - pwm->use_count = 0; - pwm->pwm_id = pdev->id; - pwm->pdev = pdev; - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (r == NULL) { - dev_err(&pdev->dev, "no memory resource defined\n"); - return -ENODEV; - } - - pwm->base = devm_request_and_ioremap(&pdev->dev, r); - if (pwm->base == NULL) - return -EADDRNOTAVAIL; - - __add_pwm(pwm); - platform_set_drvdata(pdev, pwm); - return 0; -} - -static int __devexit pwm_remove(struct platform_device *pdev) -{ - struct pwm_device *pwm; - - pwm = platform_get_drvdata(pdev); - if (pwm == NULL) - return -ENODEV; - - mutex_lock(&pwm_lock); - list_del(&pwm->node); - mutex_unlock(&pwm_lock); - - return 0; -} - -static struct platform_driver puv3_pwm_driver = { - .driver = { - .name = "PKUnity-v3-PWM", - }, - .probe = pwm_probe, - .remove = __devexit_p(pwm_remove), -}; -module_platform_driver(puv3_pwm_driver); - -MODULE_LICENSE("GPL v2"); |