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>

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index fef96f4..3307d2e 100644 (file)
--- 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 (file)
--- 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 (file)
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 (file)
--- 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 (file)
--- 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 (file)
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");