diff options
| -rw-r--r-- | arch/blackfin/Kconfig | 10 | ||||
| -rw-r--r-- | arch/blackfin/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/blackfin/kernel/pwm.c | 100 | ||||
| -rw-r--r-- | drivers/pwm/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/pwm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/pwm/pwm-bfin.c | 164 |
6 files changed, 174 insertions, 111 deletions
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig index fef96f4..3307d2e 100644 --- a/arch/blackfin/Kconfig +++ b/arch/blackfin/Kconfig @@ -996,16 +996,6 @@ config BFIN_GPTIMERS To compile this driver as a module, choose M here: the module will be called gptimers. -config HAVE_PWM - tristate "Enable PWM API support" - depends on BFIN_GPTIMERS - help - Enable support for the Pulse Width Modulation framework (as - found in linux/pwm.h). - - To compile this driver as a module, choose M here: the module - will be called pwm. - choice prompt "Uncached DMA region" default DMA_UNCACHED_1M diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile index 08e6625..735f24e 100644 --- a/arch/blackfin/kernel/Makefile +++ b/arch/blackfin/kernel/Makefile @@ -21,7 +21,6 @@ obj-$(CONFIG_FUNCTION_TRACER) += ftrace-entry.o obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o CFLAGS_REMOVE_ftrace.o = -pg -obj-$(CONFIG_HAVE_PWM) += pwm.o obj-$(CONFIG_IPIPE) += ipipe.o obj-$(CONFIG_BFIN_GPTIMERS) += gptimers.o obj-$(CONFIG_CPLB_INFO) += cplbinfo.o diff --git a/arch/blackfin/kernel/pwm.c b/arch/blackfin/kernel/pwm.c deleted file mode 100644 index 33f5942..0000000 --- a/arch/blackfin/kernel/pwm.c +++ /dev/null @@ -1,100 +0,0 @@ -/* - * Blackfin Pulse Width Modulation (PWM) core - * - * Copyright (c) 2011 Analog Devices Inc. - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/module.h> -#include <linux/pwm.h> -#include <linux/slab.h> - -#include <asm/gptimers.h> -#include <asm/portmux.h> - -struct pwm_device { - unsigned id; - unsigned short pin; -}; - -static const unsigned short pwm_to_gptimer_per[] = { - P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5, - P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11, -}; - -struct pwm_device *pwm_request(int pwm_id, const char *label) -{ - struct pwm_device *pwm; - int ret; - - /* XXX: pwm_id really should be unsigned */ - if (pwm_id < 0) - return NULL; - - pwm = kzalloc(sizeof(*pwm), GFP_KERNEL); - if (!pwm) - return pwm; - - pwm->id = pwm_id; - if (pwm->id >= ARRAY_SIZE(pwm_to_gptimer_per)) - goto err; - - pwm->pin = pwm_to_gptimer_per[pwm->id]; - ret = peripheral_request(pwm->pin, label); - if (ret) - goto err; - - return pwm; - err: - kfree(pwm); - return NULL; -} -EXPORT_SYMBOL(pwm_request); - -void pwm_free(struct pwm_device *pwm) -{ - peripheral_free(pwm->pin); - kfree(pwm); -} -EXPORT_SYMBOL(pwm_free); - -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) -{ - unsigned long period, duty; - unsigned long long val; - - if (duty_ns < 0 || duty_ns > period_ns) - return -EINVAL; - - val = (unsigned long long)get_sclk() * period_ns; - do_div(val, NSEC_PER_SEC); - period = val; - - val = (unsigned long long)period * duty_ns; - do_div(val, period_ns); - duty = period - val; - - if (duty >= period) - duty = period - 1; - - set_gptimer_config(pwm->id, TIMER_MODE_PWM | TIMER_PERIOD_CNT); - set_gptimer_pwidth(pwm->id, duty); - set_gptimer_period(pwm->id, period); - - return 0; -} -EXPORT_SYMBOL(pwm_config); - -int pwm_enable(struct pwm_device *pwm) -{ - enable_gptimer(pwm->id); - return 0; -} -EXPORT_SYMBOL(pwm_enable); - -void pwm_disable(struct pwm_device *pwm) -{ - disable_gptimer(pwm->id); -} -EXPORT_SYMBOL(pwm_disable); diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index bda6f23..eb54042 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -9,6 +9,15 @@ menuconfig PWM if PWM +config PWM_BFIN + tristate "Blackfin PWM support" + depends on BFIN_GPTIMERS + help + Generic PWM framework driver for Blackfin. + + To compile this driver as a module, choose M here: the module + will be called pwm-bfin. + config PWM_TEGRA tristate "NVIDIA Tegra PWM support" depends on ARCH_TEGRA diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 12300f5..251b8d2 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_PWM) += core.o +obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o diff --git a/drivers/pwm/pwm-bfin.c b/drivers/pwm/pwm-bfin.c new file mode 100644 index 0000000..a0c6bf9 --- /dev/null +++ b/drivers/pwm/pwm-bfin.c @@ -0,0 +1,164 @@ +/* + * Blackfin Pulse Width Modulation (PWM) core + * + * Copyright (c) 2011 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pwm.h> +#include <linux/slab.h> + +#include <asm/gptimers.h> +#include <asm/portmux.h> + +struct bfin_pwm_chip { + struct pwm_chip chip; +}; + +struct bfin_pwm { + unsigned short pin; +}; + +static const unsigned short pwm_to_gptimer_per[] = { + P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5, + P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11, +}; + +static int bfin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct bfin_pwm *priv; + int ret; + + if (pwm->hwpwm >= ARRAY_SIZE(pwm_to_gptimer_per)) + return -EINVAL; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->pin = pwm_to_gptimer_per[pwm->hwpwm]; + + ret = peripheral_request(priv->pin, NULL); + if (ret) { + kfree(priv); + return ret; + } + + pwm_set_chip_data(pwm, priv); + + return 0; +} + +static void bfin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct bfin_pwm *priv = pwm_get_chip_data(pwm); + + if (priv) { + peripheral_free(priv->pin); + kfree(priv); + } +} + +static int bfin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, + int duty_ns, int period_ns) +{ + struct bfin_pwm *priv = pwm_get_chip_data(pwm); + unsigned long period, duty; + unsigned long long val; + + if (duty_ns < 0 || duty_ns > period_ns) + return -EINVAL; + + val = (unsigned long long)get_sclk() * period_ns; + do_div(val, NSEC_PER_SEC); + period = val; + + val = (unsigned long long)period * duty_ns; + do_div(val, period_ns); + duty = period - val; + + if (duty >= period) + duty = period - 1; + + set_gptimer_config(priv->pin, TIMER_MODE_PWM | TIMER_PERIOD_CNT); + set_gptimer_pwidth(priv->pin, duty); + set_gptimer_period(priv->pin, period); + + return 0; +} + +static int bfin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct bfin_pwm *priv = pwm_get_chip_data(pwm); + + enable_gptimer(priv->pin); + + return 0; +} + +static void bfin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct bfin_pwm *priv = pwm_get_chip_data(pwm); + + disable_gptimer(priv->pin); +} + +static struct pwm_ops bfin_pwm_ops = { + .request = bfin_pwm_request, + .free = bfin_pwm_free, + .config = bfin_pwm_config, + .enable = bfin_pwm_enable, + .disable = bfin_pwm_disable, + .owner = THIS_MODULE, +}; + +static int bfin_pwm_probe(struct platform_device *pdev) +{ + struct bfin_pwm_chip *pwm; + int ret; + + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); + if (!pwm) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, pwm); + + pwm->chip.dev = &pdev->dev; + pwm->chip.ops = &bfin_pwm_ops; + pwm->chip.base = -1; + pwm->chip.npwm = 12; + + ret = pwmchip_add(&pwm->chip); + if (ret < 0) { + dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret); + return ret; + } + + return 0; +} + +static int __devexit bfin_pwm_remove(struct platform_device *pdev) +{ + struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev); + + pwmchip_remove(&pwm->chip); + + return 0; +} + +static struct platform_driver bfin_pwm_driver = { + .driver = { + .name = "bfin-pwm", + }, + .probe = bfin_pwm_probe, + .remove = __devexit_p(bfin_pwm_remove), +}; + +module_platform_driver(bfin_pwm_driver); + +MODULE_LICENSE("GPL"); |
