Cc: Thierry Reding <thierry.reding@xxxxxxxxx> Cc: Grant Likely <grant.likely@xxxxxxxxxx> Cc: Rob Herring <rob.herring@xxxxxxxxxxx> Cc: devicetree@xxxxxxxxxxxxxxx Cc: linux-pwm@xxxxxxxxxxxxxxx Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx> Cc: Lee Jones <lee.jones@xxxxxxxxxx> Cc: Shawn Guo <shawn.guo@xxxxxxxxxx> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Signed-off-by: Denis Carikli <denis@xxxxxxxxxx> --- .../devicetree/bindings/pwm/fsl,mc13xxx-pwm.txt | 19 ++ drivers/mfd/mc13xxx-core.c | 11 ++ drivers/pwm/Kconfig | 6 + drivers/pwm/Makefile | 1 + drivers/pwm/pwm-mc13xxx.c | 205 ++++++++++++++++++++ include/linux/mfd/mc13783.h | 2 + 6 files changed, 244 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/fsl,mc13xxx-pwm.txt create mode 100644 drivers/pwm/pwm-mc13xxx.c diff --git a/Documentation/devicetree/bindings/pwm/fsl,mc13xxx-pwm.txt b/Documentation/devicetree/bindings/pwm/fsl,mc13xxx-pwm.txt new file mode 100644 index 0000000..a1394d0 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/fsl,mc13xxx-pwm.txt @@ -0,0 +1,19 @@ +Freescale mc13xxx series PWM drivers. + +Supported PWMs: +mc13892 series +mc34708 series + +Required properties: +- compatible: "fsl,mc13892-pwm" or "fsl,mc34708-pwm" +- mfd: phandle to mc13xxx mfd node. +- #pwm-cells: should be 2. See pwm.txt in this directory for a description of + the cells format. + +Example: + +mc13xxx_pwm: pwm { + compatible = "fsl,mc34708-pwm"; + mfd = <&pmic>; + #pwm-cells = <2>; +}; diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c index dbbf8ee..e250f16 100644 --- a/drivers/mfd/mc13xxx-core.c +++ b/drivers/mfd/mc13xxx-core.c @@ -133,6 +133,8 @@ #define MC13XXX_ADC2 45 +struct mc13xxx *mc13xxx_data; + void mc13xxx_lock(struct mc13xxx *mc13xxx) { if (!mutex_trylock(&mc13xxx->lock)) { @@ -639,6 +641,12 @@ static inline int mc13xxx_probe_flags_dt(struct mc13xxx *mc13xxx) } #endif +struct mc13xxx *get_mc13xxx(void) +{ + return mc13xxx_data; +} +EXPORT_SYMBOL_GPL(get_mc13xxx); + int mc13xxx_common_init(struct mc13xxx *mc13xxx, struct mc13xxx_platform_data *pdata, int irq) { @@ -706,6 +714,9 @@ err_revision: mc13xxx_add_subdevice(mc13xxx, "%s-pwrbutton"); } + /* Linux will not have to handle more than one mc13xxx pmic. */ + mc13xxx_data = mc13xxx; + return 0; } EXPORT_SYMBOL_GPL(mc13xxx_common_init); diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index eece329..a959ecd 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -100,6 +100,12 @@ config PWM_LPC32XX To compile this driver as a module, choose M here: the module will be called pwm-lpc32xx. +config PWM_MC13XXX + tristate "MC13XXX PWM support" + depends on MFD_MC13XXX + help + Generic PWM framework driver for Freescale MC13XXX pmic. + config PWM_MXS tristate "Freescale MXS PWM support" depends on ARCH_MXS && OF diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 8b754e4..19f67d7 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o obj-$(CONFIG_PWM_IMX) += pwm-imx.o obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o +obj-$(CONFIG_PWM_MC13XXX) += pwm-mc13xxx.o obj-$(CONFIG_PWM_MXS) += pwm-mxs.o obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o diff --git a/drivers/pwm/pwm-mc13xxx.c b/drivers/pwm/pwm-mc13xxx.c new file mode 100644 index 0000000..e60e4d8 --- /dev/null +++ b/drivers/pwm/pwm-mc13xxx.c @@ -0,0 +1,205 @@ +/* + * Copyright 2013 Eukréa Electromatique <denis@xxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + + +#include <linux/err.h> +#include <linux/mfd/mc13783.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of_platform.h> +#include <linux/pwm.h> +#include <linux/slab.h> + +#define MHz(x) (1000*1000*x) + +#define MC13XXX_REG_PWM_CTL 55 +#define MC13XXX_BASE_CLK_FREQ (MHz(2) / 32) +#define MC13XXX_PWM1CLKDIV_SHIFT 6 +#define MC13XXX_PWM2DUTY_SHIFT 12 +#define MC13XXX_PWMDUTYDIVISOR 32 +#define MC13XXX_PWMCLKDIVISOR 64 +#define MC13XXX_PWM_REG_SIZE 0x3f +#define MC13XXX_MIN_PERIOD_NS (NSEC_PER_SEC / MC13XXX_BASE_CLK_FREQ) +#define MC13XXX_MAX_PERIOD_NS (MC13XXX_PWMCLKDIVISOR * MC13XXX_MIN_PERIOD_NS) + +struct mc13xxx_pwm_chip { + struct pwm_chip pwm_chip; + struct mc13xxx *mcdev; +}; + +static inline +struct mc13xxx_pwm_chip *to_mc13xxx_chip(struct pwm_chip *chip) +{ + return container_of(chip, struct mc13xxx_pwm_chip, pwm_chip); +} + +static int pwm_mc13xxx_config(struct pwm_chip *chip, struct pwm_device *pwm, + int duty_ns, int period_ns) +{ + struct mc13xxx_pwm_chip *mc13xxx_chip = to_mc13xxx_chip(chip); + struct mc13xxx *mcdev = mc13xxx_chip->mcdev; + struct device *dev = mc13xxx_chip->pwm_chip.dev; + u32 offset; + u32 mask = MC13XXX_PWM_REG_SIZE; + u32 val; + int ret; + int duty_cycle; + int min_duty_cycle; + int period_cycle; + unsigned long period = period_ns; + + dev_dbg(dev, "requested duty_ns=%d and period_ns=%d\n", + duty_ns, period_ns); + + /* period */ + if (period < MC13XXX_MIN_PERIOD_NS) { + dev_warn(dev, "period was under the range.\n"); + period = MC13XXX_MIN_PERIOD_NS; + } + + if (period > MC13XXX_MAX_PERIOD_NS) { + dev_warn(dev, "period was over the range.\n"); + period = MC13XXX_MAX_PERIOD_NS; + } + + period_cycle = DIV_ROUND_UP(NSEC_PER_SEC, period); + period_cycle = DIV_ROUND_UP(MC13XXX_BASE_CLK_FREQ, period_cycle); + period_cycle--; + + offset = MC13XXX_REG_PWM_CTL + pwm->hwpwm * MC13XXX_PWM2DUTY_SHIFT + + MC13XXX_PWM1CLKDIV_SHIFT; + + mc13xxx_lock(mcdev); + ret = mc13xxx_reg_read(mcdev, offset, &val); + val &= ~mask; + val += (period_cycle & mask); + ret = mc13xxx_reg_write(mcdev, offset, val); + mc13xxx_unlock(mcdev); + + /* duty cycle */ + min_duty_cycle = DIV_ROUND_UP(period, 32); + + if (duty_ns < min_duty_cycle) { + dev_warn(dev, "duty cycle is under the range.\n"); + duty_cycle = 0; + } else if (duty_ns > period) { + dev_warn(dev, "duty cycle is over the range.\n"); + duty_cycle = 32; + } else { + duty_cycle = 32 * period; + duty_cycle = DIV_ROUND_UP(period, duty_ns); + duty_cycle--; + duty_cycle = 32 - duty_cycle; + } + + offset = MC13XXX_REG_PWM_CTL + pwm->hwpwm * MC13XXX_PWM2DUTY_SHIFT; + + mc13xxx_lock(mcdev); + ret = mc13xxx_reg_read(mcdev, offset, &val); + val &= ~mask; + val += (duty_cycle & mask); + ret = mc13xxx_reg_write(mcdev, offset, val); + mc13xxx_unlock(mcdev); + + return 0; +} + +static int pwm_mc13xxx_enable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + /* The hardware doesn't need an enable */ + + return 0; +} + +static void pwm_mc13xxx_disable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + /* The hardware doesn't need a disable */ +} + +static const struct pwm_ops pwm_mc13xxx_ops = { + .enable = pwm_mc13xxx_enable, + .disable = pwm_mc13xxx_disable, + .config = pwm_mc13xxx_config, + .owner = THIS_MODULE, +}; + +static int pwm_mc13xxx_probe(struct platform_device *pdev) +{ + struct mc13xxx_pwm_chip *chip; + struct mc13xxx *mcdev; + int err; + + mcdev = get_mc13xxx(); + if (!mcdev) { + dev_err(&pdev->dev, "failed to find mc13xxx pmic.\n"); + return -EINVAL; + } + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (chip == NULL) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + return -ENOMEM; + } + + chip->pwm_chip.dev = &pdev->dev; + chip->pwm_chip.ops = &pwm_mc13xxx_ops; + chip->pwm_chip.base = pdev->id; + chip->pwm_chip.npwm = 2; + chip->mcdev = mcdev; + + err = pwmchip_add(&chip->pwm_chip); + if (err < 0) + return err; + + platform_set_drvdata(pdev, chip); + + return 0; +} + +static int pwm_mc13xxx_remove(struct platform_device *pdev) +{ + struct mc13xxx_pwm_chip *chip = platform_get_drvdata(pdev); + int ret; + + ret = pwmchip_remove(&chip->pwm_chip); + if (ret < 0) + return ret; + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id pwm_mc13xxx_of_match[] = { + { .compatible = "fsl,mc13892-pwm" }, + { .compatible = "fsl,mc34708-pwm" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, pwm_mc13xxx_of_match); +#endif + +static struct platform_driver pwm_mc13xxx_driver = { + .driver = { + .name = "mc13xxx-pwm", + .of_match_table = of_match_ptr(pwm_mc13xxx_of_match), + .owner = THIS_MODULE, + }, + .probe = pwm_mc13xxx_probe, + .remove = pwm_mc13xxx_remove, +}; + +module_platform_driver(pwm_mc13xxx_driver); + +MODULE_AUTHOR("Denis Carikli <denis@xxxxxxxxxx>"); +MODULE_DESCRIPTION("mc13xxx Pulse Width Modulation Driver"); +MODULE_ALIAS("platform:mc13xxx-pwm"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/mc13783.h b/include/linux/mfd/mc13783.h index a8eeda7..ec934e8 100644 --- a/include/linux/mfd/mc13783.h +++ b/include/linux/mfd/mc13783.h @@ -88,4 +88,6 @@ #define MC13783_IRQ_AHSSHORT 45 #define MC13783_NUM_IRQ MC13XXX_NUM_IRQ +struct mc13xxx *get_mc13xxx(void); + #endif /* ifndef __LINUX_MFD_MC13783_H */ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html