pwm: Add CLPS711X PWM support

Add a new driver for the ARM CLPS711X Pulse Width Modulator (PWM) interface.
This CPU contain two 4-bit PWM outputs with constant period, based on CPU
PLL frequency. PWM polarity is determined by hardware by power on reset.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/Documentation/devicetree/bindings/pwm/cirrus,clps711x-pwm.txt b/Documentation/devicetree/bindings/pwm/cirrus,clps711x-pwm.txt
new file mode 100644 (file)
index 0000000..a183db4
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/cirrus,clps711x-pwm.txt
@@ -0,0 +1,16 @@
+* Cirris Logic CLPS711X PWM controller
+
+Required properties:
+- compatible: Shall contain "cirrus,clps711x-pwm".
+- reg: Physical base address and length of the controller's registers.
+- clocks: phandle + clock specifier pair of the PWM reference clock.
+- #pwm-cells: Should be 1. The cell specifies the index of the channel.
+
+Example:
+       pwm: pwm@80000400 {
+               compatible = "cirrus,ep7312-pwm",
+                            "cirrus,clps711x-pwm";
+               reg = <0x80000400 0x4>;
+               clocks = <&clks 8>;
+               #pwm-cells = <1>;
+       };

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 1793562..1445ba1 100644 (file)
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -71,6 +71,15 @@ config PWM_BFIN
          To compile this driver as a module, choose M here: the module
          will be called pwm-bfin.
 
+config PWM_CLPS711X
+       tristate "CLPS711X PWM support"
+       depends on ARCH_CLPS711X || COMPILE_TEST
+       help
+         Generic PWM framework driver for Cirrus Logic CLPS711X.
+
+         To compile this driver as a module, choose M here: the module
+         will be called pwm-clps711x.
+
 config PWM_EP93XX
        tristate "Cirrus Logic EP93xx PWM support"
        depends on ARCH_EP93XX

diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 7a10e05..82f294e 100644 (file)
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_PWM_AB8500)        += pwm-ab8500.o
 obj-$(CONFIG_PWM_ATMEL)                += pwm-atmel.o
 obj-$(CONFIG_PWM_ATMEL_TCB)    += pwm-atmel-tcb.o
 obj-$(CONFIG_PWM_BFIN)         += pwm-bfin.o
+obj-$(CONFIG_PWM_CLPS711X)     += pwm-clps711x.o
 obj-$(CONFIG_PWM_EP93XX)       += pwm-ep93xx.o
 obj-$(CONFIG_PWM_FSL_FTM)      += pwm-fsl-ftm.o
 obj-$(CONFIG_PWM_IMX)          += pwm-imx.o

diff --git a/drivers/pwm/pwm-clps711x.c b/drivers/pwm/pwm-clps711x.c
new file mode 100644 (file)
index 0000000..fafb6a0
--- /dev/null
+++ b/drivers/pwm/pwm-clps711x.c
@@ -0,0 +1,176 @@
+/*
+ * Cirrus Logic CLPS711X PWM driver
+ *
+ * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+struct clps711x_chip {
+       struct pwm_chip chip;
+       void __iomem *pmpcon;
+       struct clk *clk;
+       spinlock_t lock;
+};
+
+static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
+{
+       return container_of(chip, struct clps711x_chip, chip);
+}
+
+static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v)
+{
+       /* PWM0 - bits 4..7, PWM1 - bits 8..11 */
+       u32 shift = (n + 1) * 4;
+       unsigned long flags;
+       u32 tmp;
+
+       spin_lock_irqsave(&priv->lock, flags);
+
+       tmp = readl(priv->pmpcon);
+       tmp &= ~(0xf << shift);
+       tmp |= v << shift;
+       writel(tmp, priv->pmpcon);
+
+       spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v)
+{
+       /* Duty cycle 0..15 max */
+       return DIV_ROUND_CLOSEST(v * 0xf, pwm_get_period(pwm));
+}
+
+static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+       struct clps711x_chip *priv = to_clps711x_chip(chip);
+       unsigned int freq = clk_get_rate(priv->clk);
+
+       if (!freq)
+               return -EINVAL;
+
+       /* Store constant period value */
+       pwm_set_period(pwm, DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq));
+
+       return 0;
+}
+
+static int clps711x_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+                              int duty_ns, int period_ns)
+{
+       struct clps711x_chip *priv = to_clps711x_chip(chip);
+       unsigned int duty;
+
+       if (period_ns != pwm_get_period(pwm))
+               return -EINVAL;
+
+       duty = clps711x_get_duty(pwm, duty_ns);
+       clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
+
+       return 0;
+}
+
+static int clps711x_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+       struct clps711x_chip *priv = to_clps711x_chip(chip);
+       unsigned int duty;
+
+       duty = clps711x_get_duty(pwm, pwm_get_duty_cycle(pwm));
+       clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
+
+       return 0;
+}
+
+static void clps711x_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+       struct clps711x_chip *priv = to_clps711x_chip(chip);
+
+       clps711x_pwm_update_val(priv, pwm->hwpwm, 0);
+}
+
+static const struct pwm_ops clps711x_pwm_ops = {
+       .request = clps711x_pwm_request,
+       .config = clps711x_pwm_config,
+       .enable = clps711x_pwm_enable,
+       .disable = clps711x_pwm_disable,
+       .owner = THIS_MODULE,
+};
+
+static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip,
+                                            const struct of_phandle_args *args)
+{
+       if (args->args[0] >= chip->npwm)
+               return ERR_PTR(-EINVAL);
+
+       return pwm_request_from_chip(chip, args->args[0], NULL);
+}
+
+static int clps711x_pwm_probe(struct platform_device *pdev)
+{
+       struct clps711x_chip *priv;
+       struct resource *res;
+
+       priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       priv->pmpcon = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(priv->pmpcon))
+               return PTR_ERR(priv->pmpcon);
+
+       priv->clk = devm_clk_get(&pdev->dev, NULL);
+       if (IS_ERR(priv->clk))
+               return PTR_ERR(priv->clk);
+
+       priv->chip.ops = &clps711x_pwm_ops;
+       priv->chip.dev = &pdev->dev;
+       priv->chip.base = -1;
+       priv->chip.npwm = 2;
+       priv->chip.of_xlate = clps711x_pwm_xlate;
+       priv->chip.of_pwm_n_cells = 1;
+
+       spin_lock_init(&priv->lock);
+
+       platform_set_drvdata(pdev, priv);
+
+       return pwmchip_add(&priv->chip);
+}
+
+static int clps711x_pwm_remove(struct platform_device *pdev)
+{
+       struct clps711x_chip *priv = platform_get_drvdata(pdev);
+
+       return pwmchip_remove(&priv->chip);
+}
+
+static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
+       { .compatible = "cirrus,clps711x-pwm", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);
+
+static struct platform_driver clps711x_pwm_driver = {
+       .driver = {
+               .name = "clps711x-pwm",
+               .owner = THIS_MODULE,
+               .of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
+       },
+       .probe = clps711x_pwm_probe,
+       .remove = clps711x_pwm_remove,
+};
+module_platform_driver(clps711x_pwm_driver);
+
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
+MODULE_LICENSE("GPL");