mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 14:51:00 +07:00
pwm: Move Blackfin PWM driver to PWM framework
This commit moves the Blackfin PWM driver to the drivers/pwm sub- directory and converts it to register with the new PWM framework. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Thierry Reding
parent
140fd977dc
commit
a4315e3c11
@ -996,16 +996,6 @@ config BFIN_GPTIMERS
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To compile this driver as a module, choose M here: the module
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will be called gptimers.
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config HAVE_PWM
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tristate "Enable PWM API support"
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depends on BFIN_GPTIMERS
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help
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Enable support for the Pulse Width Modulation framework (as
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found in linux/pwm.h).
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To compile this driver as a module, choose M here: the module
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will be called pwm.
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choice
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prompt "Uncached DMA region"
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default DMA_UNCACHED_1M
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@ -21,7 +21,6 @@ obj-$(CONFIG_FUNCTION_TRACER) += ftrace-entry.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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CFLAGS_REMOVE_ftrace.o = -pg
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obj-$(CONFIG_HAVE_PWM) += pwm.o
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obj-$(CONFIG_IPIPE) += ipipe.o
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obj-$(CONFIG_BFIN_GPTIMERS) += gptimers.o
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obj-$(CONFIG_CPLB_INFO) += cplbinfo.o
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@ -1,100 +0,0 @@
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/*
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* Blackfin Pulse Width Modulation (PWM) core
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*
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* Copyright (c) 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/module.h>
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#include <linux/pwm.h>
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#include <linux/slab.h>
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#include <asm/gptimers.h>
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#include <asm/portmux.h>
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struct pwm_device {
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unsigned id;
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unsigned short pin;
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};
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static const unsigned short pwm_to_gptimer_per[] = {
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P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5,
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P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11,
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};
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struct pwm_device *pwm_request(int pwm_id, const char *label)
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{
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struct pwm_device *pwm;
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int ret;
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/* XXX: pwm_id really should be unsigned */
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if (pwm_id < 0)
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return NULL;
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pwm = kzalloc(sizeof(*pwm), GFP_KERNEL);
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if (!pwm)
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return pwm;
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pwm->id = pwm_id;
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if (pwm->id >= ARRAY_SIZE(pwm_to_gptimer_per))
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goto err;
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pwm->pin = pwm_to_gptimer_per[pwm->id];
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ret = peripheral_request(pwm->pin, label);
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if (ret)
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goto err;
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return pwm;
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err:
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kfree(pwm);
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return NULL;
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}
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EXPORT_SYMBOL(pwm_request);
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void pwm_free(struct pwm_device *pwm)
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{
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peripheral_free(pwm->pin);
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kfree(pwm);
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}
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EXPORT_SYMBOL(pwm_free);
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int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
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{
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unsigned long period, duty;
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unsigned long long val;
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if (duty_ns < 0 || duty_ns > period_ns)
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return -EINVAL;
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val = (unsigned long long)get_sclk() * period_ns;
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do_div(val, NSEC_PER_SEC);
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period = val;
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val = (unsigned long long)period * duty_ns;
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do_div(val, period_ns);
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duty = period - val;
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if (duty >= period)
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duty = period - 1;
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set_gptimer_config(pwm->id, TIMER_MODE_PWM | TIMER_PERIOD_CNT);
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set_gptimer_pwidth(pwm->id, duty);
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set_gptimer_period(pwm->id, period);
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return 0;
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}
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EXPORT_SYMBOL(pwm_config);
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int pwm_enable(struct pwm_device *pwm)
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{
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enable_gptimer(pwm->id);
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return 0;
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}
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EXPORT_SYMBOL(pwm_enable);
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void pwm_disable(struct pwm_device *pwm)
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{
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disable_gptimer(pwm->id);
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}
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EXPORT_SYMBOL(pwm_disable);
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@ -9,6 +9,15 @@ menuconfig PWM
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if PWM
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config PWM_BFIN
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tristate "Blackfin PWM support"
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depends on BFIN_GPTIMERS
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help
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Generic PWM framework driver for Blackfin.
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To compile this driver as a module, choose M here: the module
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will be called pwm-bfin.
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config PWM_TEGRA
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tristate "NVIDIA Tegra PWM support"
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depends on ARCH_TEGRA
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@ -1,2 +1,3 @@
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obj-$(CONFIG_PWM) += core.o
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obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
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obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
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164
drivers/pwm/pwm-bfin.c
Normal file
164
drivers/pwm/pwm-bfin.c
Normal file
@ -0,0 +1,164 @@
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/*
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* Blackfin Pulse Width Modulation (PWM) core
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*
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* Copyright (c) 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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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/pwm.h>
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#include <linux/slab.h>
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#include <asm/gptimers.h>
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#include <asm/portmux.h>
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struct bfin_pwm_chip {
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struct pwm_chip chip;
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};
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struct bfin_pwm {
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unsigned short pin;
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};
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static const unsigned short pwm_to_gptimer_per[] = {
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P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5,
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P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11,
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};
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static int bfin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct bfin_pwm *priv;
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int ret;
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if (pwm->hwpwm >= ARRAY_SIZE(pwm_to_gptimer_per))
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return -EINVAL;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->pin = pwm_to_gptimer_per[pwm->hwpwm];
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ret = peripheral_request(priv->pin, NULL);
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if (ret) {
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kfree(priv);
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return ret;
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}
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pwm_set_chip_data(pwm, priv);
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return 0;
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}
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static void bfin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct bfin_pwm *priv = pwm_get_chip_data(pwm);
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if (priv) {
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peripheral_free(priv->pin);
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kfree(priv);
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}
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}
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static int bfin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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int duty_ns, int period_ns)
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{
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struct bfin_pwm *priv = pwm_get_chip_data(pwm);
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unsigned long period, duty;
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unsigned long long val;
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if (duty_ns < 0 || duty_ns > period_ns)
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return -EINVAL;
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val = (unsigned long long)get_sclk() * period_ns;
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do_div(val, NSEC_PER_SEC);
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period = val;
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val = (unsigned long long)period * duty_ns;
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do_div(val, period_ns);
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duty = period - val;
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if (duty >= period)
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duty = period - 1;
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set_gptimer_config(priv->pin, TIMER_MODE_PWM | TIMER_PERIOD_CNT);
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set_gptimer_pwidth(priv->pin, duty);
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set_gptimer_period(priv->pin, period);
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return 0;
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}
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static int bfin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct bfin_pwm *priv = pwm_get_chip_data(pwm);
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enable_gptimer(priv->pin);
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return 0;
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}
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static void bfin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct bfin_pwm *priv = pwm_get_chip_data(pwm);
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disable_gptimer(priv->pin);
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}
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static struct pwm_ops bfin_pwm_ops = {
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.request = bfin_pwm_request,
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.free = bfin_pwm_free,
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.config = bfin_pwm_config,
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.enable = bfin_pwm_enable,
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.disable = bfin_pwm_disable,
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.owner = THIS_MODULE,
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};
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static int bfin_pwm_probe(struct platform_device *pdev)
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{
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struct bfin_pwm_chip *pwm;
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int ret;
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pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
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if (!pwm) {
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dev_err(&pdev->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, pwm);
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pwm->chip.dev = &pdev->dev;
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pwm->chip.ops = &bfin_pwm_ops;
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pwm->chip.base = -1;
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pwm->chip.npwm = 12;
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ret = pwmchip_add(&pwm->chip);
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if (ret < 0) {
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dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int __devexit bfin_pwm_remove(struct platform_device *pdev)
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{
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struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev);
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pwmchip_remove(&pwm->chip);
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return 0;
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}
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static struct platform_driver bfin_pwm_driver = {
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.driver = {
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.name = "bfin-pwm",
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},
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.probe = bfin_pwm_probe,
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.remove = __devexit_p(bfin_pwm_remove),
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};
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module_platform_driver(bfin_pwm_driver);
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MODULE_LICENSE("GPL");
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