ARM: 5628/1: ep93xx: Introduce Pulse Width Modulator (PWM) driver
The EP93xx features two PWMs (one on the EP9307) with the following
features:
* Configurable dual output
* Separate input clocks for each PWM output
* 16-bit resolution
* Programmable pulse width (duty cycle), interval (frequency), and
polarity
This adds the necessary core support as well as the driver. A sysfs
interface is provided to control the PWM outputs.
Signed-off-by: Matthieu Crapet <mcrapet@gmail.com>
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Hartley Sweeten
Russell King
parent
3aa7a9a3cf
commit
ef12379f20
7 changed files with 492 additions and 0 deletions
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@ -72,6 +72,9 @@ static struct clk clk_keypad = {
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.enable_mask = EP93XX_SYSCON_KEYTCHCLKDIV_KEN,
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.set_rate = set_keytchclk_rate,
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};
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static struct clk clk_pwm = {
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.rate = EP93XX_EXT_CLK_RATE,
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};
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/* DMA Clocks */
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static struct clk clk_m2p0 = {
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@ -137,6 +140,7 @@ static struct clk_lookup clocks[] = {
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INIT_CK(NULL, "pll2", &clk_pll2),
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INIT_CK("ep93xx-ohci", NULL, &clk_usb_host),
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INIT_CK("ep93xx-keypad", NULL, &clk_keypad),
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INIT_CK(NULL, "pwm_clk", &clk_pwm),
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INIT_CK(NULL, "m2p0", &clk_m2p0),
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INIT_CK(NULL, "m2p1", &clk_m2p1),
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INIT_CK(NULL, "m2p2", &clk_m2p2),
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@ -597,6 +597,91 @@ static struct platform_device ep93xx_leds = {
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};
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/*************************************************************************
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* EP93xx pwm peripheral handling
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*************************************************************************/
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static struct resource ep93xx_pwm0_resource[] = {
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{
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.start = EP93XX_PWM_PHYS_BASE,
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.end = EP93XX_PWM_PHYS_BASE + 0x10 - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct platform_device ep93xx_pwm0_device = {
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.name = "ep93xx-pwm",
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.id = 0,
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.num_resources = ARRAY_SIZE(ep93xx_pwm0_resource),
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.resource = ep93xx_pwm0_resource,
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};
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static struct resource ep93xx_pwm1_resource[] = {
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{
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.start = EP93XX_PWM_PHYS_BASE + 0x20,
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.end = EP93XX_PWM_PHYS_BASE + 0x30 - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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static struct platform_device ep93xx_pwm1_device = {
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.name = "ep93xx-pwm",
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.id = 1,
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.num_resources = ARRAY_SIZE(ep93xx_pwm1_resource),
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.resource = ep93xx_pwm1_resource,
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};
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void __init ep93xx_register_pwm(int pwm0, int pwm1)
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{
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if (pwm0)
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platform_device_register(&ep93xx_pwm0_device);
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/* NOTE: EP9307 does not have PWMOUT1 (pin EGPIO14) */
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if (pwm1)
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platform_device_register(&ep93xx_pwm1_device);
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}
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int ep93xx_pwm_acquire_gpio(struct platform_device *pdev)
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{
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int err;
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if (pdev->id == 0) {
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err = 0;
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} else if (pdev->id == 1) {
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err = gpio_request(EP93XX_GPIO_LINE_EGPIO14,
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dev_name(&pdev->dev));
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if (err)
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return err;
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err = gpio_direction_output(EP93XX_GPIO_LINE_EGPIO14, 0);
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if (err)
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goto fail;
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/* PWM 1 output on EGPIO[14] */
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ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_PONG);
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} else {
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err = -ENODEV;
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}
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return err;
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fail:
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gpio_free(EP93XX_GPIO_LINE_EGPIO14);
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return err;
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}
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EXPORT_SYMBOL(ep93xx_pwm_acquire_gpio);
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void ep93xx_pwm_release_gpio(struct platform_device *pdev)
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{
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if (pdev->id == 1) {
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gpio_direction_input(EP93XX_GPIO_LINE_EGPIO14);
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gpio_free(EP93XX_GPIO_LINE_EGPIO14);
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/* EGPIO[14] used for GPIO */
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ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_PONG);
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}
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}
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EXPORT_SYMBOL(ep93xx_pwm_release_gpio);
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extern void ep93xx_gpio_init(void);
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void __init ep93xx_init_devices(void)
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@ -147,6 +147,7 @@
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#define EP93XX_ADC_BASE EP93XX_APB_IOMEM(0x00100000)
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#define EP93XX_TOUCHSCREEN_BASE EP93XX_APB_IOMEM(0x00100000)
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#define EP93XX_PWM_PHYS_BASE (EP93XX_APB_PHYS_BASE + 0x00110000)
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#define EP93XX_PWM_BASE EP93XX_APB_IOMEM(0x00110000)
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#define EP93XX_RTC_PHYS_BASE (EP93XX_APB_PHYS_BASE + 0x00120000)
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@ -5,6 +5,7 @@
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#ifndef __ASSEMBLY__
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struct i2c_board_info;
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struct platform_device;
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struct ep93xx_eth_data
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{
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@ -32,6 +33,9 @@ static inline void ep93xx_devcfg_clear_bits(unsigned int bits)
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void ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr);
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void ep93xx_register_i2c(struct i2c_board_info *devices, int num);
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void ep93xx_register_pwm(int pwm0, int pwm1);
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int ep93xx_pwm_acquire_gpio(struct platform_device *pdev);
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void ep93xx_pwm_release_gpio(struct platform_device *pdev);
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void ep93xx_init_devices(void);
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extern struct sys_timer ep93xx_timer;
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@ -233,6 +233,19 @@ config ISL29003
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This driver can also be built as a module. If so, the module
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will be called isl29003.
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config EP93XX_PWM
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tristate "EP93xx PWM support"
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depends on ARCH_EP93XX
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help
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This option enables device driver support for the PWM channels
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on the Cirrus EP93xx processors. The EP9307 chip only has one
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PWM channel all the others have two, the second channel is an
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alternate function of the EGPIO14 pin. A sysfs interface is
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provided to control the PWM channels.
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To compile this driver as a module, choose M here: the module will
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be called ep93xx_pwm.
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source "drivers/misc/c2port/Kconfig"
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source "drivers/misc/eeprom/Kconfig"
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source "drivers/misc/cb710/Kconfig"
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@ -19,6 +19,7 @@ obj-$(CONFIG_SGI_XP) += sgi-xp/
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obj-$(CONFIG_SGI_GRU) += sgi-gru/
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obj-$(CONFIG_HP_ILO) += hpilo.o
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obj-$(CONFIG_ISL29003) += isl29003.o
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obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
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obj-$(CONFIG_C2PORT) += c2port/
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obj-y += eeprom/
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obj-y += cb710/
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384
drivers/misc/ep93xx_pwm.c
Normal file
384
drivers/misc/ep93xx_pwm.c
Normal file
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@ -0,0 +1,384 @@
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/*
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* Simple PWM driver for EP93XX
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*
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* (c) Copyright 2009 Matthieu Crapet <mcrapet@gmail.com>
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* (c) Copyright 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* EP9307 has only one channel:
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* - PWMOUT
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*
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* EP9301/02/12/15 have two channels:
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* - PWMOUT
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* - PWMOUT1 (alternate function for EGPIO14)
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*/
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#include <linux/module.h>
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#include <linux/platform_device.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 <mach/platform.h>
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#define EP93XX_PWMx_TERM_COUNT 0x00
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#define EP93XX_PWMx_DUTY_CYCLE 0x04
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#define EP93XX_PWMx_ENABLE 0x08
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#define EP93XX_PWMx_INVERT 0x0C
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#define EP93XX_PWM_MAX_COUNT 0xFFFF
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struct ep93xx_pwm {
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void __iomem *mmio_base;
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struct clk *clk;
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u32 duty_percent;
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};
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static inline void ep93xx_pwm_writel(struct ep93xx_pwm *pwm,
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unsigned int val, unsigned int off)
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{
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__raw_writel(val, pwm->mmio_base + off);
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}
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static inline unsigned int ep93xx_pwm_readl(struct ep93xx_pwm *pwm,
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unsigned int off)
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{
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return __raw_readl(pwm->mmio_base + off);
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}
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static inline void ep93xx_pwm_write_tc(struct ep93xx_pwm *pwm, u16 value)
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{
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ep93xx_pwm_writel(pwm, value, EP93XX_PWMx_TERM_COUNT);
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}
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static inline u16 ep93xx_pwm_read_tc(struct ep93xx_pwm *pwm)
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{
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return ep93xx_pwm_readl(pwm, EP93XX_PWMx_TERM_COUNT);
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}
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static inline void ep93xx_pwm_write_dc(struct ep93xx_pwm *pwm, u16 value)
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{
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ep93xx_pwm_writel(pwm, value, EP93XX_PWMx_DUTY_CYCLE);
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}
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static inline void ep93xx_pwm_enable(struct ep93xx_pwm *pwm)
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{
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ep93xx_pwm_writel(pwm, 0x1, EP93XX_PWMx_ENABLE);
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}
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static inline void ep93xx_pwm_disable(struct ep93xx_pwm *pwm)
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{
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ep93xx_pwm_writel(pwm, 0x0, EP93XX_PWMx_ENABLE);
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}
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static inline int ep93xx_pwm_is_enabled(struct ep93xx_pwm *pwm)
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{
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return ep93xx_pwm_readl(pwm, EP93XX_PWMx_ENABLE) & 0x1;
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}
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static inline void ep93xx_pwm_invert(struct ep93xx_pwm *pwm)
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{
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ep93xx_pwm_writel(pwm, 0x1, EP93XX_PWMx_INVERT);
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}
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static inline void ep93xx_pwm_normal(struct ep93xx_pwm *pwm)
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{
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ep93xx_pwm_writel(pwm, 0x0, EP93XX_PWMx_INVERT);
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}
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static inline int ep93xx_pwm_is_inverted(struct ep93xx_pwm *pwm)
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{
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return ep93xx_pwm_readl(pwm, EP93XX_PWMx_INVERT) & 0x1;
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}
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/*
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* /sys/devices/platform/ep93xx-pwm.N
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* /min_freq read-only minimum pwm output frequency
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* /max_req read-only maximum pwm output frequency
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* /freq read-write pwm output frequency (0 = disable output)
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* /duty_percent read-write pwm duty cycle percent (1..99)
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* /invert read-write invert pwm output
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*/
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static ssize_t ep93xx_pwm_get_min_freq(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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unsigned long rate = clk_get_rate(pwm->clk);
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return sprintf(buf, "%ld\n", rate / (EP93XX_PWM_MAX_COUNT + 1));
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}
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static ssize_t ep93xx_pwm_get_max_freq(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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unsigned long rate = clk_get_rate(pwm->clk);
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return sprintf(buf, "%ld\n", rate / 2);
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}
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static ssize_t ep93xx_pwm_get_freq(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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if (ep93xx_pwm_is_enabled(pwm)) {
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unsigned long rate = clk_get_rate(pwm->clk);
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u16 term = ep93xx_pwm_read_tc(pwm);
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return sprintf(buf, "%ld\n", rate / (term + 1));
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} else {
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return sprintf(buf, "disabled\n");
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}
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}
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static ssize_t ep93xx_pwm_set_freq(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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long val;
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int err;
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err = strict_strtol(buf, 10, &val);
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if (err)
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return -EINVAL;
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if (val == 0) {
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ep93xx_pwm_disable(pwm);
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} else if (val <= (clk_get_rate(pwm->clk) / 2)) {
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u32 term, duty;
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val = (clk_get_rate(pwm->clk) / val) - 1;
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if (val > EP93XX_PWM_MAX_COUNT)
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val = EP93XX_PWM_MAX_COUNT;
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if (val < 1)
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val = 1;
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term = ep93xx_pwm_read_tc(pwm);
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duty = ((val + 1) * pwm->duty_percent / 100) - 1;
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/* If pwm is running, order is important */
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if (val > term) {
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ep93xx_pwm_write_tc(pwm, val);
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ep93xx_pwm_write_dc(pwm, duty);
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} else {
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ep93xx_pwm_write_dc(pwm, duty);
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ep93xx_pwm_write_tc(pwm, val);
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}
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if (!ep93xx_pwm_is_enabled(pwm))
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ep93xx_pwm_enable(pwm);
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} else {
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return -EINVAL;
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}
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return count;
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}
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static ssize_t ep93xx_pwm_get_duty_percent(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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return sprintf(buf, "%d\n", pwm->duty_percent);
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}
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static ssize_t ep93xx_pwm_set_duty_percent(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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long val;
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int err;
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err = strict_strtol(buf, 10, &val);
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if (err)
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return -EINVAL;
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if (val > 0 && val < 100) {
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u32 term = ep93xx_pwm_read_tc(pwm);
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ep93xx_pwm_write_dc(pwm, ((term + 1) * val / 100) - 1);
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pwm->duty_percent = val;
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return count;
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}
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return -EINVAL;
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}
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static ssize_t ep93xx_pwm_get_invert(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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return sprintf(buf, "%d\n", ep93xx_pwm_is_inverted(pwm));
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}
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static ssize_t ep93xx_pwm_set_invert(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
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long val;
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int err;
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err = strict_strtol(buf, 10, &val);
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if (err)
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return -EINVAL;
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if (val == 0)
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ep93xx_pwm_normal(pwm);
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else if (val == 1)
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ep93xx_pwm_invert(pwm);
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else
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return -EINVAL;
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return count;
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}
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static DEVICE_ATTR(min_freq, S_IRUGO, ep93xx_pwm_get_min_freq, NULL);
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static DEVICE_ATTR(max_freq, S_IRUGO, ep93xx_pwm_get_max_freq, NULL);
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static DEVICE_ATTR(freq, S_IWUGO | S_IRUGO,
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ep93xx_pwm_get_freq, ep93xx_pwm_set_freq);
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static DEVICE_ATTR(duty_percent, S_IWUGO | S_IRUGO,
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ep93xx_pwm_get_duty_percent, ep93xx_pwm_set_duty_percent);
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static DEVICE_ATTR(invert, S_IWUGO | S_IRUGO,
|
||||
ep93xx_pwm_get_invert, ep93xx_pwm_set_invert);
|
||||
|
||||
static struct attribute *ep93xx_pwm_attrs[] = {
|
||||
&dev_attr_min_freq.attr,
|
||||
&dev_attr_max_freq.attr,
|
||||
&dev_attr_freq.attr,
|
||||
&dev_attr_duty_percent.attr,
|
||||
&dev_attr_invert.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static const struct attribute_group ep93xx_pwm_sysfs_files = {
|
||||
.attrs = ep93xx_pwm_attrs,
|
||||
};
|
||||
|
||||
static int __init ep93xx_pwm_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct ep93xx_pwm *pwm;
|
||||
struct resource *res;
|
||||
int err;
|
||||
|
||||
err = ep93xx_pwm_acquire_gpio(pdev);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
pwm = kzalloc(sizeof(struct ep93xx_pwm), GFP_KERNEL);
|
||||
if (!pwm) {
|
||||
err = -ENOMEM;
|
||||
goto fail_no_mem;
|
||||
}
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (res == NULL) {
|
||||
err = -ENXIO;
|
||||
goto fail_no_mem_resource;
|
||||
}
|
||||
|
||||
res = request_mem_region(res->start, resource_size(res), pdev->name);
|
||||
if (res == NULL) {
|
||||
err = -EBUSY;
|
||||
goto fail_no_mem_resource;
|
||||
}
|
||||
|
||||
pwm->mmio_base = ioremap(res->start, resource_size(res));
|
||||
if (pwm->mmio_base == NULL) {
|
||||
err = -ENXIO;
|
||||
goto fail_no_ioremap;
|
||||
}
|
||||
|
||||
err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
|
||||
if (err)
|
||||
goto fail_no_sysfs;
|
||||
|
||||
pwm->clk = clk_get(&pdev->dev, "pwm_clk");
|
||||
if (IS_ERR(pwm->clk)) {
|
||||
err = PTR_ERR(pwm->clk);
|
||||
goto fail_no_clk;
|
||||
}
|
||||
|
||||
pwm->duty_percent = 50;
|
||||
|
||||
platform_set_drvdata(pdev, pwm);
|
||||
|
||||
/* disable pwm at startup. Avoids zero value. */
|
||||
ep93xx_pwm_disable(pwm);
|
||||
ep93xx_pwm_write_tc(pwm, EP93XX_PWM_MAX_COUNT);
|
||||
ep93xx_pwm_write_dc(pwm, EP93XX_PWM_MAX_COUNT / 2);
|
||||
|
||||
clk_enable(pwm->clk);
|
||||
|
||||
return 0;
|
||||
|
||||
fail_no_clk:
|
||||
sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
|
||||
fail_no_sysfs:
|
||||
iounmap(pwm->mmio_base);
|
||||
fail_no_ioremap:
|
||||
release_mem_region(res->start, resource_size(res));
|
||||
fail_no_mem_resource:
|
||||
kfree(pwm);
|
||||
fail_no_mem:
|
||||
ep93xx_pwm_release_gpio(pdev);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __exit ep93xx_pwm_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
|
||||
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
|
||||
ep93xx_pwm_disable(pwm);
|
||||
clk_disable(pwm->clk);
|
||||
clk_put(pwm->clk);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
|
||||
iounmap(pwm->mmio_base);
|
||||
release_mem_region(res->start, resource_size(res));
|
||||
kfree(pwm);
|
||||
ep93xx_pwm_release_gpio(pdev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver ep93xx_pwm_driver = {
|
||||
.driver = {
|
||||
.name = "ep93xx-pwm",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.remove = __exit_p(ep93xx_pwm_remove),
|
||||
};
|
||||
|
||||
static int __init ep93xx_pwm_init(void)
|
||||
{
|
||||
return platform_driver_probe(&ep93xx_pwm_driver, ep93xx_pwm_probe);
|
||||
}
|
||||
|
||||
static void __exit ep93xx_pwm_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&ep93xx_pwm_driver);
|
||||
}
|
||||
|
||||
module_init(ep93xx_pwm_init);
|
||||
module_exit(ep93xx_pwm_exit);
|
||||
|
||||
MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>, "
|
||||
"H Hartley Sweeten <hsweeten@visionengravers.com>");
|
||||
MODULE_DESCRIPTION("EP93xx PWM driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:ep93xx-pwm");
|
||||
Loading…
Reference in a new issue