From d1b6886502160eb771aefe21c1f891597138ddfe Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Fri, 14 Sep 2012 16:14:25 +0800 Subject: unicore32: pwm: Properly remap memory-mapped registers Instead of writing to the timer controller registers by dereferencing a pointer to the memory location, properly remap the memory region with a call to ioremap_nocache() and access the registers using writel(). Signed-off-by: Thierry Reding Signed-off-by: Guan Xuetao Tested-by: Qin Rui --- arch/unicore32/include/mach/regs-ost.h | 18 ++++++++---------- arch/unicore32/kernel/pwm.c | 21 ++++++++++++++++++--- 2 files changed, 26 insertions(+), 13 deletions(-) (limited to 'arch/unicore32') diff --git a/arch/unicore32/include/mach/regs-ost.h b/arch/unicore32/include/mach/regs-ost.h index 7b91fe6..4a85fb4 100644 --- a/arch/unicore32/include/mach/regs-ost.h +++ b/arch/unicore32/include/mach/regs-ost.h @@ -33,18 +33,16 @@ * Interrupt Enable Reg OST_OIER */ #define OST_OIER (PKUNITY_OST_BASE + 0x001C) + /* - * PWM Pulse Width Control Reg OST_PWMPWCR - */ -#define OST_PWMPWCR (PKUNITY_OST_BASE + 0x0080) -/* - * PWM Duty Cycle Control Reg OST_PWMDCCR - */ -#define OST_PWMDCCR (PKUNITY_OST_BASE + 0x0084) -/* - * PWM Period Control Reg OST_PWMPCR + * PWM Registers: IO base address: PKUNITY_OST_BASE + 0x80 + * PWCR: Pulse Width Control Reg + * DCCR: Duty Cycle Control Reg + * PCR: Period Control Reg */ -#define OST_PWMPCR (PKUNITY_OST_BASE + 0x0088) +#define OST_PWM_PWCR (0x00) +#define OST_PWM_DCCR (0x04) +#define OST_PWM_PCR (0x08) /* * Match detected 0 OST_OSSR_M0 diff --git a/arch/unicore32/kernel/pwm.c b/arch/unicore32/kernel/pwm.c index 4615d51..885bbcd 100644 --- a/arch/unicore32/kernel/pwm.c +++ b/arch/unicore32/kernel/pwm.c @@ -27,6 +27,8 @@ struct pwm_device { struct list_head node; struct platform_device *pdev; + void __iomem *base; + const char *label; struct clk *clk; int clk_enabled; @@ -69,9 +71,11 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) * before writing to the registers */ clk_enable(pwm->clk); - OST_PWMPWCR = prescale; - OST_PWMDCCR = pv - dc; - OST_PWMPCR = pv; + + 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; @@ -190,10 +194,19 @@ static struct pwm_device *pwm_probe(struct platform_device *pdev, goto err_free_clk; } + pwm->base = ioremap_nocache(r->start, resource_size(r)); + if (pwm->base == NULL) { + dev_err(&pdev->dev, "failed to remap memory resource\n"); + ret = -EADDRNOTAVAIL; + goto err_release_mem; + } + __add_pwm(pwm); platform_set_drvdata(pdev, pwm); return pwm; +err_release_mem: + release_mem_region(r->start, resource_size(r)); err_free_clk: clk_put(pwm->clk); err_free: @@ -224,6 +237,8 @@ static int __devexit pwm_remove(struct platform_device *pdev) list_del(&pwm->node); mutex_unlock(&pwm_lock); + iounmap(pwm->base); + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(r->start, resource_size(r)); -- cgit v1.1 From dde9959b8d5b791a3e06e3c44f2d9ba0ec5143f0 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Thu, 30 Aug 2012 13:43:14 +0200 Subject: unicore32: pwm: Use module_platform_driver() Some of the boilerplate code can be eliminated by using this macro. The driver was previously registered with an arch_initcall(), so technically this is no longer the same, but when the driver is moved to the PWM framework, deferred probing will take care of any driver probe ordering issues. Signed-off-by: Thierry Reding Tested-by: Qin Rui Acked-by: Guan Xuetao --- arch/unicore32/kernel/pwm.c | 21 +-------------------- 1 file changed, 1 insertion(+), 20 deletions(-) (limited to 'arch/unicore32') diff --git a/arch/unicore32/kernel/pwm.c b/arch/unicore32/kernel/pwm.c index 885bbcd..012c54a 100644 --- a/arch/unicore32/kernel/pwm.c +++ b/arch/unicore32/kernel/pwm.c @@ -254,25 +254,6 @@ static struct platform_driver puv3_pwm_driver = { .probe = puv3_pwm_probe, .remove = __devexit_p(pwm_remove), }; - -static int __init pwm_init(void) -{ - int ret = 0; - - ret = platform_driver_register(&puv3_pwm_driver); - if (ret) { - printk(KERN_ERR "failed to register puv3_pwm_driver\n"); - return ret; - } - - return ret; -} -arch_initcall(pwm_init); - -static void __exit pwm_exit(void) -{ - platform_driver_unregister(&puv3_pwm_driver); -} -module_exit(pwm_exit); +module_platform_driver(puv3_pwm_driver); MODULE_LICENSE("GPL v2"); -- cgit v1.1 From e551fadef3650c34137e90f17963ca613b8f8610 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Thu, 30 Aug 2012 13:48:10 +0200 Subject: unicore32: pwm: Remove unnecessary indirection Calling the actual probing function through a proxy isn't required and makes the code needlessly complex. Signed-off-by: Thierry Reding Tested-by: Qin Rui Acked-by: Guan Xuetao --- arch/unicore32/kernel/pwm.c | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) (limited to 'arch/unicore32') diff --git a/arch/unicore32/kernel/pwm.c b/arch/unicore32/kernel/pwm.c index 012c54a..7e23470 100644 --- a/arch/unicore32/kernel/pwm.c +++ b/arch/unicore32/kernel/pwm.c @@ -156,8 +156,7 @@ static inline void __add_pwm(struct pwm_device *pwm) mutex_unlock(&pwm_lock); } -static struct pwm_device *pwm_probe(struct platform_device *pdev, - unsigned int pwm_id, struct pwm_device *parent_pwm) +static int __devinit pwm_probe(struct platform_device *pdev) { struct pwm_device *pwm; struct resource *r; @@ -166,7 +165,7 @@ static struct pwm_device *pwm_probe(struct platform_device *pdev, pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL); if (pwm == NULL) { dev_err(&pdev->dev, "failed to allocate memory\n"); - return ERR_PTR(-ENOMEM); + return -ENOMEM; } pwm->clk = clk_get(NULL, "OST_CLK"); @@ -177,7 +176,7 @@ static struct pwm_device *pwm_probe(struct platform_device *pdev, pwm->clk_enabled = 0; pwm->use_count = 0; - pwm->pwm_id = pwm_id; + pwm->pwm_id = pdev->id; pwm->pdev = pdev; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -203,7 +202,7 @@ static struct pwm_device *pwm_probe(struct platform_device *pdev, __add_pwm(pwm); platform_set_drvdata(pdev, pwm); - return pwm; + return 0; err_release_mem: release_mem_region(r->start, resource_size(r)); @@ -211,17 +210,7 @@ err_free_clk: clk_put(pwm->clk); err_free: kfree(pwm); - return ERR_PTR(ret); -} - -static int __devinit puv3_pwm_probe(struct platform_device *pdev) -{ - struct pwm_device *pwm = pwm_probe(pdev, pdev->id, NULL); - - if (IS_ERR(pwm)) - return PTR_ERR(pwm); - - return 0; + return ret; } static int __devexit pwm_remove(struct platform_device *pdev) @@ -251,7 +240,7 @@ static struct platform_driver puv3_pwm_driver = { .driver = { .name = "PKUnity-v3-PWM", }, - .probe = puv3_pwm_probe, + .probe = pwm_probe, .remove = __devexit_p(pwm_remove), }; module_platform_driver(puv3_pwm_driver); -- cgit v1.1 From 5384e27317016bd30aa7a7a7513f76ce7caa3b09 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Thu, 30 Aug 2012 15:52:28 +0200 Subject: unicore32: pwm: Use managed resource allocations This commit uses the managed resource allocation functions to simplify the cleanup paths on error and removal. Signed-off-by: Thierry Reding Tested-by: Qin Rui Acked-by: Guan Xuetao --- arch/unicore32/kernel/pwm.c | 47 +++++++++------------------------------------ 1 file changed, 9 insertions(+), 38 deletions(-) (limited to 'arch/unicore32') diff --git a/arch/unicore32/kernel/pwm.c b/arch/unicore32/kernel/pwm.c index 7e23470..724e860 100644 --- a/arch/unicore32/kernel/pwm.c +++ b/arch/unicore32/kernel/pwm.c @@ -160,19 +160,17 @@ static int __devinit pwm_probe(struct platform_device *pdev) { struct pwm_device *pwm; struct resource *r; - int ret = 0; - pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL); + 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 = clk_get(NULL, "OST_CLK"); - if (IS_ERR(pwm->clk)) { - ret = PTR_ERR(pwm->clk); - goto err_free; - } + 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; @@ -182,41 +180,21 @@ static int __devinit pwm_probe(struct platform_device *pdev) r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (r == NULL) { dev_err(&pdev->dev, "no memory resource defined\n"); - ret = -ENODEV; - goto err_free_clk; - } - - r = request_mem_region(r->start, resource_size(r), pdev->name); - if (r == NULL) { - dev_err(&pdev->dev, "failed to request memory resource\n"); - ret = -EBUSY; - goto err_free_clk; + return -ENODEV; } - pwm->base = ioremap_nocache(r->start, resource_size(r)); - if (pwm->base == NULL) { - dev_err(&pdev->dev, "failed to remap memory resource\n"); - ret = -EADDRNOTAVAIL; - goto err_release_mem; - } + 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; - -err_release_mem: - release_mem_region(r->start, resource_size(r)); -err_free_clk: - clk_put(pwm->clk); -err_free: - kfree(pwm); - return ret; } static int __devexit pwm_remove(struct platform_device *pdev) { struct pwm_device *pwm; - struct resource *r; pwm = platform_get_drvdata(pdev); if (pwm == NULL) @@ -226,13 +204,6 @@ static int __devexit pwm_remove(struct platform_device *pdev) list_del(&pwm->node); mutex_unlock(&pwm_lock); - iounmap(pwm->base); - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - release_mem_region(r->start, resource_size(r)); - - clk_put(pwm->clk); - kfree(pwm); return 0; } -- cgit v1.1 From 79c11b6fa0b225ac165e79e821d50e70f563645f Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Fri, 31 Aug 2012 08:29:24 +0200 Subject: 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 Tested-by: Qin Rui Acked-by: Guan Xuetao --- arch/unicore32/Kconfig | 12 +-- arch/unicore32/kernel/Makefile | 1 - arch/unicore32/kernel/pwm.c | 219 ----------------------------------------- 3 files changed, 2 insertions(+), 230 deletions(-) delete mode 100644 arch/unicore32/kernel/pwm.c (limited to 'arch/unicore32') diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig index b0a4743..91e2037 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 . -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 3240101..fa497e0 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 724e860..0000000 --- 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 - * 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 -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -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"); -- cgit v1.1