parent
f0fe59648a
commit
101766fb00
@ -1,54 +0,0 @@ |
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#
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# Copyright (C) 2010 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk |
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include $(INCLUDE_DIR)/kernel.mk |
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PKG_NAME:=pwm-gpio-custom
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk |
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define KernelPackage/pwm-gpio-custom |
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SUBMENU:=Other modules
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TITLE:=Custom GPIO-based PWM device
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DEPENDS:=+kmod-pwm-gpio
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FILES:=$(PKG_BUILD_DIR)/pwm-gpio-custom.ko
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KCONFIG:=
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endef |
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define KernelPackage/pwm-gpio-custom/description |
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Kernel module to register a custom pwm-gpio platform device.
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endef |
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EXTRA_KCONFIG:= \
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CONFIG_PWM_GPIO_CUSTOM=m
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EXTRA_CFLAGS:= \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter %=m,$(EXTRA_KCONFIG)))) \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter %=y,$(EXTRA_KCONFIG))))
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MAKE_OPTS:= \
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ARCH="$(LINUX_KARCH)" \
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CROSS_COMPILE="$(TARGET_CROSS)" \
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SUBDIRS="$(PKG_BUILD_DIR)" \
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EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
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$(EXTRA_KCONFIG)
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define Build/Prepare |
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef |
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define Build/Compile |
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$(MAKE) -C "$(LINUX_DIR)" \
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$(MAKE_OPTS) \
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modules
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endef |
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$(eval $(call KernelPackage,pwm-gpio-custom)) |
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@ -1,4 +0,0 @@ |
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config PWM_MASTER_GPIO_CUSTOM |
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tristate "Custom GPIO-based PWM driver" |
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depends on GENERIC_GPIO |
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select PWM_GENERIC_GPIO |
@ -1 +0,0 @@ |
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obj-${CONFIG_PWM_GPIO_CUSTOM} += pwm-gpio-custom.o
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@ -1,218 +0,0 @@ |
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/*
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* Custom GPIO-based PWM driver |
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* |
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* Based on w1-gpio-custom by Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org> |
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* Copyright (C) 2010 Claudio Mignanti <c.mignanti@gmail.com > |
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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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* --------------------------------------------------------------------------- |
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* |
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* The behaviour of this driver can be altered by setting some parameters |
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* from the insmod command line. |
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* |
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* The following parameters are adjustable: |
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* |
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* bus0 These four arguments must be arrays |
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* bus1 |
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* ..... |
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* bus10 <id>,<pin>,<od> |
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* |
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* where: |
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* |
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* <id> ID to used as device_id for the corresponding bus (required) |
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* <pin> GPIO pin ID for PWM channel (required) |
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* * |
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* If this driver is built into the kernel, you can use the following kernel |
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* command line parameters, with the same values as the corresponding module |
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* parameters listed above: |
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* |
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* pwm-gpio-custom.bus0 |
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* pwm-gpio-custom.bus1 |
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* pwm-gpio-custom.bunN |
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* pwm-gpio-custom.bus10 |
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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/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/workqueue.h> |
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#include <linux/pwm/pwm.h> |
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#define DRV_NAME "pwm-gpio-custom" |
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#define DRV_DESC "Custom GPIO-based pwm driver" |
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#define DRV_VERSION "0.1.0" |
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#define PFX DRV_NAME ": " |
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#define BUS_PARAM_ID 0 |
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#define BUS_PARAM_PIN 1 |
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#define BUS_PARAM_REQUIRED 2 |
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#define BUS_PARAM_COUNT 2 |
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#define BUS_COUNT_MAX 10 |
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static unsigned int bus0[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus1[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus2[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus3[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus4[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus5[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus6[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus7[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus8[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus9[BUS_PARAM_COUNT] __initdata; |
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static unsigned int bus_nump[BUS_COUNT_MAX] __initdata; |
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#define BUS_PARM_DESC " config -> id,pin" |
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module_param_array(bus0, uint, &bus_nump[0], 0); |
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MODULE_PARM_DESC(bus0, "bus0" BUS_PARM_DESC); |
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module_param_array(bus1, uint, &bus_nump[1], 0); |
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MODULE_PARM_DESC(bus1, "bus1" BUS_PARM_DESC); |
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module_param_array(bus2, uint, &bus_nump[2], 0); |
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MODULE_PARM_DESC(bus2, "bus2" BUS_PARM_DESC); |
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module_param_array(bus3, uint, &bus_nump[3], 0); |
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MODULE_PARM_DESC(bus3, "bus3" BUS_PARM_DESC); |
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module_param_array(bus4, uint, &bus_nump[4], 0); |
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MODULE_PARM_DESC(bus4, "bus4" BUS_PARM_DESC); |
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module_param_array(bus5, uint, &bus_nump[5], 0); |
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MODULE_PARM_DESC(bus5, "bus5" BUS_PARM_DESC); |
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module_param_array(bus6, uint, &bus_nump[6], 0); |
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MODULE_PARM_DESC(bus6, "bus6" BUS_PARM_DESC); |
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module_param_array(bus7, uint, &bus_nump[7], 0); |
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MODULE_PARM_DESC(bus7, "bus7" BUS_PARM_DESC); |
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module_param_array(bus8, uint, &bus_nump[8], 0); |
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MODULE_PARM_DESC(bus8, "bus8" BUS_PARM_DESC); |
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module_param_array(bus9, uint, &bus_nump[9], 0); |
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MODULE_PARM_DESC(bus9, "bus9" BUS_PARM_DESC); |
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static struct platform_device *devices[BUS_COUNT_MAX]; |
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static unsigned int nr_devices; |
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static void pwm_gpio_custom_cleanup(void) |
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{ |
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int i; |
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for (i = 0; i < nr_devices; i++) |
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if (devices[i]) |
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platform_device_put(devices[i]); |
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} |
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static int __init pwm_gpio_custom_add_one(unsigned int id, unsigned int *params) |
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{ |
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struct platform_device *pdev; |
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struct gpio_pwm_platform_data pdata; |
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int err; |
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if (!bus_nump[id]) |
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return 0; |
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if (bus_nump[id] < BUS_PARAM_REQUIRED) { |
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printk(KERN_ERR PFX "not enough parameters for bus%d\n", id); |
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err = -EINVAL; |
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goto err; |
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} |
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pdev = platform_device_alloc("gpio_pwm", params[BUS_PARAM_ID]); |
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if (!pdev) { |
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err = -ENOMEM; |
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goto err; |
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} |
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pdata.gpio = params[BUS_PARAM_PIN]; |
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err = platform_device_add_data(pdev, &pdata, sizeof(pdata)); |
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if (err) |
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goto err_put; |
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err = platform_device_add(pdev); |
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if (err) |
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goto err_put; |
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devices[nr_devices++] = pdev; |
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return 0; |
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err_put: |
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platform_device_put(pdev); |
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err: |
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return err; |
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} |
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static int __init pwm_gpio_custom_probe(void) |
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{ |
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int err; |
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nr_devices = 0; |
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printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n"); |
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err = pwm_gpio_custom_add_one(0, bus0); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(1, bus1); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(2, bus2); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(3, bus3); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(4, bus4); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(5, bus5); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(6, bus6); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(7, bus7); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(8, bus8); |
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if (err) goto err; |
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err = pwm_gpio_custom_add_one(9, bus9); |
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if (err) goto err; |
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if (!nr_devices) { |
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printk(KERN_ERR PFX "no bus parameter(s) specified\n"); |
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err = -ENODEV; |
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goto err; |
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} |
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return 0; |
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err: |
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pwm_gpio_custom_cleanup(); |
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return err; |
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} |
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#ifdef MODULE |
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static int __init pwm_gpio_custom_init(void) |
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{ |
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return pwm_gpio_custom_probe(); |
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} |
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module_init(pwm_gpio_custom_init); |
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static void __exit pwm_gpio_custom_exit(void) |
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{ |
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pwm_gpio_custom_cleanup(); |
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} |
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module_exit(pwm_gpio_custom_exit); |
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#else |
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subsys_initcall(pwm_gpio_custom_probe); |
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#endif /* MODULE*/ |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Bifferos <bifferos at yahoo.co.uk >"); |
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MODULE_AUTHOR("Claudio Mignanti <c.mignanti@gmail.com >"); |
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MODULE_DESCRIPTION(DRV_DESC); |
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MODULE_VERSION(DRV_VERSION); |
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@ -1,592 +0,0 @@ |
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/*
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* drivers/pwm/atmel-pwm.c |
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* |
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* Copyright (C) 2010 Bill Gatliff <bgat@billgatliff.com> |
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* Copyright (C) 2007 David Brownell |
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* |
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* This program is free software; you may redistribute 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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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
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* USA |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/clk.h> |
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#include <linux/err.h> |
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#include <linux/io.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/pwm/pwm.h> |
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enum { |
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/* registers common to the PWMC peripheral */ |
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PWMC_MR = 0, |
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PWMC_ENA = 4, |
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PWMC_DIS = 8, |
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PWMC_SR = 0xc, |
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PWMC_IER = 0x10, |
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PWMC_IDR = 0x14, |
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PWMC_IMR = 0x18, |
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PWMC_ISR = 0x1c, |
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/* registers per each PWMC channel */ |
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PWMC_CMR = 0, |
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PWMC_CDTY = 4, |
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PWMC_CPRD = 8, |
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PWMC_CCNT = 0xc, |
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PWMC_CUPD = 0x10, |
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/* how to find each channel */ |
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PWMC_CHAN_BASE = 0x200, |
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PWMC_CHAN_STRIDE = 0x20, |
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/* CMR bits of interest */ |
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PWMC_CMR_CPD = 10, |
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PWMC_CMR_CPOL = 9, |
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PWMC_CMR_CALG = 8, |
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PWMC_CMR_CPRE_MASK = 0xf, |
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}; |
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struct atmel_pwm { |
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struct pwm_device pwm; |
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spinlock_t lock; |
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void __iomem *iobase; |
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struct clk *clk; |
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u32 *sync_mask; |
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int irq; |
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u32 ccnt_mask; |
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}; |
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static inline struct atmel_pwm *to_atmel_pwm(const struct pwm_channel *p) |
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{ |
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return container_of(p->pwm, struct atmel_pwm, pwm); |
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} |
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static inline void |
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pwmc_writel(const struct atmel_pwm *p, |
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unsigned offset, u32 val) |
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{ |
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__raw_writel(val, p->iobase + offset); |
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} |
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static inline u32 |
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pwmc_readl(const struct atmel_pwm *p, |
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unsigned offset) |
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{ |
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return __raw_readl(p->iobase + offset); |
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} |
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static inline void |
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pwmc_chan_writel(const struct pwm_channel *p, |
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u32 offset, u32 val) |
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{ |
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const struct atmel_pwm *ap = to_atmel_pwm(p); |
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if (PWMC_CMR == offset) |
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val &= ((1 << PWMC_CMR_CPD) |
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| (1 << PWMC_CMR_CPOL) |
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| (1 << PWMC_CMR_CALG) |
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| (PWMC_CMR_CPRE_MASK)); |
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else |
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val &= ap->ccnt_mask; |
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pwmc_writel(ap, offset + PWMC_CHAN_BASE |
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+ (p->chan * PWMC_CHAN_STRIDE), val); |
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} |
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static inline u32 |
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pwmc_chan_readl(const struct pwm_channel *p, |
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u32 offset) |
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{ |
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const struct atmel_pwm *ap = to_atmel_pwm(p); |
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return pwmc_readl(ap, offset + PWMC_CHAN_BASE |
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+ (p->chan * PWMC_CHAN_STRIDE)); |
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} |
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static inline int |
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__atmel_pwm_is_on(struct pwm_channel *p) |
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{ |
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struct atmel_pwm *ap = to_atmel_pwm(p); |
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return (pwmc_readl(ap, PWMC_SR) & (1 << p->chan)) ? 1 : 0; |
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} |
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static inline void |
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__atmel_pwm_unsynchronize(struct pwm_channel *p, |
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struct pwm_channel *to_p) |
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{ |
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const struct atmel_pwm *ap = to_atmel_pwm(p); |
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int wchan; |
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if (to_p) { |
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ap->sync_mask[p->chan] &= ~(1 << to_p->chan); |
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ap->sync_mask[to_p->chan] &= ~(1 << p->chan); |
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goto done; |
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} |
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ap->sync_mask[p->chan] = 0; |
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for (wchan = 0; wchan < ap->pwm.nchan; wchan++) |
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ap->sync_mask[wchan] &= ~(1 << p->chan); |
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done: |
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dev_dbg(p->pwm->dev, "sync_mask %x\n", ap->sync_mask[p->chan]); |
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} |
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static inline void |
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__atmel_pwm_synchronize(struct pwm_channel *p, |
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struct pwm_channel *to_p) |
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{ |
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const struct atmel_pwm *ap = to_atmel_pwm(p); |
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if (!to_p) |
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return; |
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ap->sync_mask[p->chan] |= (1 << to_p->chan); |
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ap->sync_mask[to_p->chan] |= (1 << p->chan); |
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dev_dbg(p->pwm->dev, "sync_mask %x\n", ap->sync_mask[p->chan]); |
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} |
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static inline void |
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__atmel_pwm_stop(struct pwm_channel *p) |
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{ |
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struct atmel_pwm *ap = to_atmel_pwm(p); |
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u32 chid = 1 << p->chan; |
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pwmc_writel(ap, PWMC_DIS, ap->sync_mask[p->chan] | chid); |
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} |
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static inline void |
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__atmel_pwm_start(struct pwm_channel *p) |
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{ |
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struct atmel_pwm *ap = to_atmel_pwm(p); |
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u32 chid = 1 << p->chan; |
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pwmc_writel(ap, PWMC_ENA, ap->sync_mask[p->chan] | chid); |
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} |
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static int |
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atmel_pwm_synchronize(struct pwm_channel *p, |
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struct pwm_channel *to_p) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&p->lock, flags); |
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__atmel_pwm_synchronize(p, to_p); |
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spin_unlock_irqrestore(&p->lock, flags); |
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return 0; |
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} |
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static int |
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atmel_pwm_unsynchronize(struct pwm_channel *p, |
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struct pwm_channel *from_p) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&p->lock, flags); |
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__atmel_pwm_unsynchronize(p, from_p); |
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spin_unlock_irqrestore(&p->lock, flags); |
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return 0; |
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} |
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static inline int |
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__atmel_pwm_config_polarity(struct pwm_channel *p, |
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struct pwm_channel_config *c) |
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{ |
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u32 cmr = pwmc_chan_readl(p, PWMC_CMR); |
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if (c->polarity) |
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cmr &= ~BIT(PWMC_CMR_CPOL); |
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else |
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cmr |= BIT(PWMC_CMR_CPOL); |
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pwmc_chan_writel(p, PWMC_CMR, cmr); |
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p->active_high = c->polarity ? 1 : 0; |
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dev_dbg(p->pwm->dev, "polarity %d\n", c->polarity); |
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return 0; |
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} |
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static inline int |
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__atmel_pwm_config_duty_ticks(struct pwm_channel *p, |
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struct pwm_channel_config *c) |
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{ |
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u32 cmr, cprd, cpre, cdty; |
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cmr = pwmc_chan_readl(p, PWMC_CMR); |
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cprd = pwmc_chan_readl(p, PWMC_CPRD); |
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cpre = cmr & PWMC_CMR_CPRE_MASK; |
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cmr &= ~BIT(PWMC_CMR_CPD); |
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cdty = cprd - (c->duty_ticks >> cpre); |
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p->duty_ticks = c->duty_ticks; |
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if (__atmel_pwm_is_on(p)) { |
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pwmc_chan_writel(p, PWMC_CMR, cmr); |
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pwmc_chan_writel(p, PWMC_CUPD, cdty); |
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} else |
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pwmc_chan_writel(p, PWMC_CDTY, cdty); |
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dev_dbg(p->pwm->dev, "duty_ticks = %lu cprd = %x" |
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" cdty = %x cpre = %x\n", p->duty_ticks, |
||||
cprd, cdty, cpre); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static inline int |
||||
__atmel_pwm_config_period_ticks(struct pwm_channel *p, |
||||
struct pwm_channel_config *c) |
||||
{ |
||||
u32 cmr, cprd, cpre; |
||||
|
||||
cpre = fls(c->period_ticks); |
||||
if (cpre < 16) |
||||
cpre = 0; |
||||
else { |
||||
cpre -= 15; |
||||
if (cpre > 10) |
||||
return -EINVAL; |
||||
} |
||||
|
||||
cmr = pwmc_chan_readl(p, PWMC_CMR); |
||||
cmr &= ~PWMC_CMR_CPRE_MASK; |
||||
cmr |= cpre; |
||||
|
||||
cprd = c->period_ticks >> cpre; |
||||
|
||||
pwmc_chan_writel(p, PWMC_CMR, cmr); |
||||
pwmc_chan_writel(p, PWMC_CPRD, cprd); |
||||
p->period_ticks = c->period_ticks; |
||||
|
||||
dev_dbg(p->pwm->dev, "period_ticks = %lu cprd = %x cpre = %x\n", |
||||
p->period_ticks, cprd, cpre); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int |
||||
atmel_pwm_config_nosleep(struct pwm_channel *p, |
||||
struct pwm_channel_config *c) |
||||
{ |
||||
int ret = 0; |
||||
unsigned long flags; |
||||
|
||||
spin_lock_irqsave(&p->lock, flags); |
||||
|
||||
switch (c->config_mask) { |
||||
|
||||
case PWM_CONFIG_DUTY_TICKS: |
||||
__atmel_pwm_config_duty_ticks(p, c); |
||||
break; |
||||
|
||||
case PWM_CONFIG_STOP: |
||||
__atmel_pwm_stop(p); |
||||
break; |
||||
|
||||
case PWM_CONFIG_START: |
||||
__atmel_pwm_start(p); |
||||
break; |
||||
|
||||
case PWM_CONFIG_POLARITY: |
||||
__atmel_pwm_config_polarity(p, c); |
||||
break; |
||||
|
||||
default: |
||||
ret = -EINVAL; |
||||
break; |
||||
} |
||||
|
||||
spin_unlock_irqrestore(&p->lock, flags); |
||||
return ret; |
||||
} |
||||
|
||||
static int |
||||
atmel_pwm_stop_sync(struct pwm_channel *p) |
||||
{ |
||||
struct atmel_pwm *ap = container_of(p->pwm, struct atmel_pwm, pwm); |
||||
int ret; |
||||
int was_on = __atmel_pwm_is_on(p); |
||||
|
||||
if (was_on) { |
||||
do { |
||||
init_completion(&p->complete); |
||||
set_bit(FLAG_STOP, &p->flags); |
||||
pwmc_writel(ap, PWMC_IER, 1 << p->chan); |
||||
|
||||
dev_dbg(p->pwm->dev, "waiting on stop_sync completion...\n"); |
||||
|
||||
ret = wait_for_completion_interruptible(&p->complete); |
||||
|
||||
dev_dbg(p->pwm->dev, "stop_sync complete (%d)\n", ret); |
||||
|
||||
if (ret) |
||||
return ret; |
||||
} while (p->flags & BIT(FLAG_STOP)); |
||||
} |
||||
|
||||
return was_on; |
||||
} |
||||
|
||||
static int |
||||
atmel_pwm_config(struct pwm_channel *p, |
||||
struct pwm_channel_config *c) |
||||
{ |
||||
int was_on = 0; |
||||
|
||||
if (p->pwm->config_nosleep) { |
||||
if (!p->pwm->config_nosleep(p, c)) |
||||
return 0; |
||||
} |
||||
|
||||
might_sleep(); |
||||
|
||||
dev_dbg(p->pwm->dev, "config_mask %x\n", c->config_mask); |
||||
|
||||
was_on = atmel_pwm_stop_sync(p); |
||||
if (was_on < 0) |
||||
return was_on; |
||||
|
||||
if (c->config_mask & PWM_CONFIG_PERIOD_TICKS) { |
||||
__atmel_pwm_config_period_ticks(p, c); |
||||
if (!(c->config_mask & PWM_CONFIG_DUTY_TICKS)) { |
||||
struct pwm_channel_config d = { |
||||
.config_mask = PWM_CONFIG_DUTY_TICKS, |
||||
.duty_ticks = p->duty_ticks, |
||||
}; |
||||
__atmel_pwm_config_duty_ticks(p, &d); |
||||
} |
||||
} |
||||
|
||||
if (c->config_mask & PWM_CONFIG_DUTY_TICKS) |
||||
__atmel_pwm_config_duty_ticks(p, c); |
||||
|
||||
if (c->config_mask & PWM_CONFIG_POLARITY) |
||||
__atmel_pwm_config_polarity(p, c); |
||||
|
||||
if ((c->config_mask & PWM_CONFIG_START) |
||||
|| (was_on && !(c->config_mask & PWM_CONFIG_STOP))) |
||||
__atmel_pwm_start(p); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static void |
||||
__atmel_pwm_set_callback(struct pwm_channel *p, |
||||
pwm_callback_t callback) |
||||
{ |
||||
struct atmel_pwm *ap = container_of(p->pwm, struct atmel_pwm, pwm); |
||||
|
||||
p->callback = callback; |
||||
pwmc_writel(ap, p->callback ? PWMC_IER : PWMC_IDR, 1 << p->chan); |
||||
} |
||||
|
||||
static int |
||||
atmel_pwm_set_callback(struct pwm_channel *p, |
||||
pwm_callback_t callback) |
||||
{ |
||||
struct atmel_pwm *ap = to_atmel_pwm(p); |
||||
unsigned long flags; |
||||
|
||||
spin_lock_irqsave(&ap->lock, flags); |
||||
__atmel_pwm_set_callback(p, callback); |
||||
spin_unlock_irqrestore(&ap->lock, flags); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int |
||||
atmel_pwm_request(struct pwm_channel *p) |
||||
{ |
||||
struct atmel_pwm *ap = to_atmel_pwm(p); |
||||
unsigned long flags; |
||||
|
||||
spin_lock_irqsave(&p->lock, flags); |
||||
clk_enable(ap->clk); |
||||
p->tick_hz = clk_get_rate(ap->clk); |
||||
__atmel_pwm_unsynchronize(p, NULL); |
||||
__atmel_pwm_stop(p); |
||||
spin_unlock_irqrestore(&p->lock, flags); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static void |
||||
atmel_pwm_free(struct pwm_channel *p) |
||||
{ |
||||
struct atmel_pwm *ap = to_atmel_pwm(p); |
||||
clk_disable(ap->clk); |
||||
} |
||||
|
||||
static irqreturn_t |
||||
atmel_pwmc_irq(int irq, void *data) |
||||
{ |
||||
struct atmel_pwm *ap = data; |
||||
struct pwm_channel *p; |
||||
u32 isr; |
||||
int chid; |
||||
unsigned long flags; |
||||
|
||||
spin_lock_irqsave(&ap->lock, flags); |
||||
|
||||
isr = pwmc_readl(ap, PWMC_ISR); |
||||
for (chid = 0; isr; chid++, isr >>= 1) { |
||||
p = &ap->pwm.channels[chid]; |
||||
if (isr & 1) { |
||||
if (p->callback) |
||||
p->callback(p); |
||||
if (p->flags & BIT(FLAG_STOP)) { |
||||
__atmel_pwm_stop(p); |
||||
clear_bit(FLAG_STOP, &p->flags); |
||||
} |
||||
complete_all(&p->complete); |
||||
} |
||||
} |
||||
|
||||
spin_unlock_irqrestore(&ap->lock, flags); |
||||
|
||||
return IRQ_HANDLED; |
||||
} |
||||
|
||||
static int __devinit |
||||
atmel_pwmc_probe(struct platform_device *pdev) |
||||
{ |
||||
struct atmel_pwm *ap; |
||||
struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
||||
int ret = 0; |
||||
|
||||
ap = kzalloc(sizeof(*ap), GFP_KERNEL); |
||||
if (!ap) { |
||||
ret = -ENOMEM; |
||||
goto err_atmel_pwm_alloc; |
||||
} |
||||
|
||||
spin_lock_init(&ap->lock); |
||||
platform_set_drvdata(pdev, ap); |
||||
|
||||
ap->pwm.dev = &pdev->dev; |
||||
ap->pwm.bus_id = dev_name(&pdev->dev); |
||||
|
||||
ap->pwm.nchan = 4; /* TODO: true only for SAM9263 and AP7000 */ |
||||
ap->ccnt_mask = 0xffffUL; /* TODO: true only for SAM9263 */ |
||||
|
||||
ap->sync_mask = kzalloc(ap->pwm.nchan * sizeof(u32), GFP_KERNEL); |
||||
if (!ap->sync_mask) { |
||||
ret = -ENOMEM; |
||||
goto err_alloc_sync_masks; |
||||
} |
||||
|
||||
ap->pwm.owner = THIS_MODULE; |
||||
ap->pwm.request = atmel_pwm_request; |
||||
ap->pwm.free = atmel_pwm_free; |
||||
ap->pwm.config_nosleep = atmel_pwm_config_nosleep; |
||||
ap->pwm.config = atmel_pwm_config; |
||||
ap->pwm.synchronize = atmel_pwm_synchronize; |
||||
ap->pwm.unsynchronize = atmel_pwm_unsynchronize; |
||||
ap->pwm.set_callback = atmel_pwm_set_callback; |
||||
|
||||
ap->clk = clk_get(&pdev->dev, "pwm_clk"); |
||||
if (PTR_ERR(ap->clk)) { |
||||
ret = -ENODEV; |
||||
goto err_clk_get; |
||||
} |
||||
|
||||
ap->iobase = ioremap_nocache(r->start, r->end - r->start + 1); |
||||
if (!ap->iobase) { |
||||
ret = -ENODEV; |
||||
goto err_ioremap; |
||||
} |
||||
|
||||
clk_enable(ap->clk); |
||||
pwmc_writel(ap, PWMC_DIS, -1); |
||||
pwmc_writel(ap, PWMC_IDR, -1); |
||||
clk_disable(ap->clk); |
||||
|
||||
ap->irq = platform_get_irq(pdev, 0); |
||||
if (ap->irq != -ENXIO) { |
||||
ret = request_irq(ap->irq, atmel_pwmc_irq, 0, |
||||
ap->pwm.bus_id, ap); |
||||
if (ret) |
||||
goto err_request_irq; |
||||
} |
||||
|
||||
ret = pwm_register(&ap->pwm); |
||||
if (ret) |
||||
goto err_pwm_register; |
||||
|
||||
return 0; |
||||
|
||||
err_pwm_register: |
||||
if (ap->irq != -ENXIO) |
||||
free_irq(ap->irq, ap); |
||||
err_request_irq: |
||||
iounmap(ap->iobase); |
||||
err_ioremap: |
||||
clk_put(ap->clk); |
||||
err_clk_get: |
||||
platform_set_drvdata(pdev, NULL); |
||||
err_alloc_sync_masks: |
||||
kfree(ap); |
||||
err_atmel_pwm_alloc: |
||||
return ret; |
||||
} |
||||
|
||||
static int __devexit |
||||
atmel_pwmc_remove(struct platform_device *pdev) |
||||
{ |
||||
struct atmel_pwm *ap = platform_get_drvdata(pdev); |
||||
int ret; |
||||
|
||||
/* TODO: what can we do if this fails? */ |
||||
ret = pwm_unregister(&ap->pwm); |
||||
|
||||
clk_enable(ap->clk); |
||||
pwmc_writel(ap, PWMC_IDR, -1); |
||||
pwmc_writel(ap, PWMC_DIS, -1); |
||||
clk_disable(ap->clk); |
||||
|
||||
if (ap->irq != -ENXIO) |
||||
free_irq(ap->irq, ap); |
||||
|
||||
clk_put(ap->clk); |
||||
iounmap(ap->iobase); |
||||
|
||||
kfree(ap); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static struct platform_driver atmel_pwm_driver = { |
||||
.driver = { |
||||
.name = "atmel_pwmc", |
||||
.owner = THIS_MODULE, |
||||
}, |
||||
.probe = atmel_pwmc_probe, |
||||
.remove = __devexit_p(atmel_pwmc_remove), |
||||
}; |
||||
|
||||
static int __init atmel_pwm_init(void) |
||||
{ |
||||
return platform_driver_register(&atmel_pwm_driver); |
||||
} |
||||
module_init(atmel_pwm_init); |
||||
|
||||
static void __exit atmel_pwm_exit(void) |
||||
{ |
||||
platform_driver_unregister(&atmel_pwm_driver); |
||||
} |
||||
module_exit(atmel_pwm_exit); |
||||
|
||||
MODULE_AUTHOR("Bill Gatliff <bgat@billgatliff.com>"); |
||||
MODULE_DESCRIPTION("Driver for Atmel PWMC peripheral"); |
||||
MODULE_LICENSE("GPL"); |
||||
MODULE_ALIAS("platform:atmel_pwmc"); |
@ -0,0 +1,25 @@ |
||||
Index: linux-3.3.8/drivers/Kconfig
|
||||
===================================================================
|
||||
--- linux-3.3.8.orig/drivers/Kconfig 2012-06-01 09:16:13.000000000 +0200
|
||||
+++ linux-3.3.8/drivers/Kconfig 2012-07-28 22:16:32.894397322 +0200
|
||||
@@ -60,6 +60,8 @@
|
||||
|
||||
source "drivers/gpio/Kconfig"
|
||||
|
||||
+source "drivers/pwm/Kconfig"
|
||||
+
|
||||
source "drivers/w1/Kconfig"
|
||||
|
||||
source "drivers/power/Kconfig"
|
||||
Index: linux-3.3.8/drivers/Makefile
|
||||
===================================================================
|
||||
--- linux-3.3.8.orig/drivers/Makefile 2012-06-01 09:16:13.000000000 +0200
|
||||
+++ linux-3.3.8/drivers/Makefile 2012-07-28 22:16:17.990396684 +0200
|
||||
@@ -8,6 +8,7 @@
|
||||
# GPIO must come after pinctrl as gpios may need to mux pins etc
|
||||
obj-y += pinctrl/
|
||||
obj-y += gpio/
|
||||
+obj-$(CONFIG_GENERIC_PWM) += pwm/
|
||||
obj-$(CONFIG_PCI) += pci/
|
||||
obj-$(CONFIG_PARISC) += parisc/
|
||||
obj-$(CONFIG_RAPIDIO) += rapidio/
|
Loading…
Reference in new issue