[PATCH 2/2] pwm: Add a i.MX23/28 pwm driver

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/pwm/mxs-pwm.c |  275 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 275 insertions(+), 0 deletions(-)
 create mode 100644 drivers/pwm/mxs-pwm.c

diff --git a/drivers/pwm/mxs-pwm.c b/drivers/pwm/mxs-pwm.c
new file mode 100644
index 0000000..052cb0c
--- /dev/null
+++ b/drivers/pwm/mxs-pwm.c

@@ -0,0 +1,275 @@
+/*
+ * Copyright (C) 2011 Pengutronix
+ * Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * simple driver for PWM (Pulse Width Modulator) controller
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from pxa PWM driver by eric miao <eric.miao@marvell.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/pwm.h>
+#include <mach/hardware.h>
+#include <mach/mxs.h>
+#include <mach/mx23.h>
+#include <mach/mx28.h>
+#include <asm/div64.h>
+
+struct mxs_pwm_device {
+	struct device		*dev;
+
+	struct clk	*clk;
+
+	int		enabled;
+	void __iomem	*mmio_base;
+
+	unsigned int	pwm_id;
+
+	u32		val_active;
+	u32		val_period;
+	int		period_us;
+	struct pwm_chip chip;
+};
+
+/* common register space */
+static void __iomem *pwm_base_common;
+#define REG_PWM_CTRL	0x0
+#define PWM_SFTRST	(1 << 31)
+#define PWM_CLKGATE	(1 << 30)
+#define PWM_ENABLE(p)	(1 << (p))
+
+/* per pwm register space */
+#define REG_ACTIVE	0x0
+#define REG_PERIOD	0x10
+
+#define PERIOD_PERIOD(p)	((p) & 0xffff)
+#define PERIOD_ACTIVE_HIGH	(3 << 16)
+#define PERIOD_INACTIVE_LOW	(2 << 18)
+#define PERIOD_CDIV(div)	(((div) & 0x7) << 20)
+

+static int __devinit mxs_pwm_probe(struct platform_device *pdev)
+{
+	struct mxs_pwm_device *pwm;
+	struct resource *r;
+	int ret = 0;
+
+	pwm = devm_kzalloc(&pdev->dev, sizeof(struct mxs_pwm_device), GFP_KERNEL);
+	if (pwm == NULL) {
+		dev_err(&pdev->dev, "failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	pwm->clk = clk_get(&pdev->dev, NULL);
+
+	if (IS_ERR(pwm->clk)) {

+		ret = PTR_ERR(pwm->clk);
+		goto err_free;
+	}
+
+	pwm->chip.ops = &mxs_pwm_ops;
+
+	pwm->enabled = 0;

+
+	pwm->chip.pwm_id = pdev->id;
+	pwm->chip.owner = THIS_MODULE;
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (r == NULL) {
+		dev_err(&pdev->dev, "no memory resource defined\n");
+		ret = -ENODEV;
+		goto err_free_clk;
+	}
+
+	r = request_mem_region(r->start, resource_size(r), pdev->name);
+	if (r == NULL) {
+		dev_err(&pdev->dev, "failed to request memory resource\n");
+		ret = -EBUSY;
+		goto err_free_clk;
+	}
+
+	pwm->mmio_base = ioremap(r->start, resource_size(r));
+	if (pwm->mmio_base == NULL) {
+		dev_err(&pdev->dev, "failed to ioremap() registers\n");
+		ret = -ENODEV;

+	if (ret)
+		goto err_free_mem;
+
+	platform_set_drvdata(pdev, pwm);
+	return 0;
+
+err_free_mem:
+	release_mem_region(r->start, resource_size(r));
+err_free_clk:
+	clk_put(pwm->clk);
+err_free:
+	kfree(pwm);
+	return ret;
+}
+
+static int __devexit mxs_pwm_remove(struct platform_device *pdev)
+{
+	struct mxs_pwm_device *pwm;
+	struct resource *r;
+	int ret;
+
+	pwm = platform_get_drvdata(pdev);
+
+	ret = pwmchip_remove(&pwm->chip);
+	if (ret)
+		return ret;
+
+	iounmap(pwm->mmio_base);
+
+	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(r->start, resource_size(r));
+
+	clk_put(pwm->clk);
+
+	return 0;
+}
+
+static struct platform_driver mxs_pwm_driver = {
+	.driver		= {
+		.name	= "mxs-pwm",
+	},
+	.probe		= mxs_pwm_probe,
+	.remove		= __devexit_p(mxs_pwm_remove),
+};
+
+static int __init mxs_pwm_init(void)
+{
+	if (cpu_is_mx28())
+		pwm_base_common = MX28_IO_ADDRESS(MX28_PWM_BASE_ADDR);
+	else
+		pwm_base_common = MX23_IO_ADDRESS(MX23_PWM_BASE_ADDR);
+
+	__mxs_clrl(PWM_SFTRST | PWM_CLKGATE, pwm_base_common + REG_PWM_CTRL);
+