Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / pwm / pwm-bfin.c

diff --git a/kernel/drivers/pwm/pwm-bfin.c b/kernel/drivers/pwm/pwm-bfin.c
new file mode 100644 (file)
index 0000000..7631ef1
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-bfin.c
@@ -0,0 +1,159 @@
+/*
+ * 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;
+
+       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 bfin_pwm_remove(struct platform_device *pdev)
+{
+       struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev);
+
+       return pwmchip_remove(&pwm->chip);
+}
+
+static struct platform_driver bfin_pwm_driver = {
+       .driver = {
+               .name = "bfin-pwm",
+       },
+       .probe = bfin_pwm_probe,
+       .remove = bfin_pwm_remove,
+};
+
+module_platform_driver(bfin_pwm_driver);
+
+MODULE_LICENSE("GPL");