Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/drivers/pwm/pwm-tipwmss.c b/kernel/drivers/pwm/pwm-tipwmss.c
new file mode 100644 (file)
index 0000000..5cf65a1
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-tipwmss.c
@@ -0,0 +1,133 @@
+/*
+ * TI PWM Subsystem driver
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/of_device.h>
+
+#include "pwm-tipwmss.h"
+
+#define PWMSS_CLKCONFIG                0x8     /* Clock gating reg */
+#define PWMSS_CLKSTATUS                0xc     /* Clock gating status reg */
+
+struct pwmss_info {
+       void __iomem    *mmio_base;
+       struct mutex    pwmss_lock;
+       u16             pwmss_clkconfig;
+};
+
+u16 pwmss_submodule_state_change(struct device *dev, int set)
+{
+       struct pwmss_info *info = dev_get_drvdata(dev);
+       u16 val;
+
+       mutex_lock(&info->pwmss_lock);
+       val = readw(info->mmio_base + PWMSS_CLKCONFIG);
+       val |= set;
+       writew(val , info->mmio_base + PWMSS_CLKCONFIG);
+       mutex_unlock(&info->pwmss_lock);
+
+       return readw(info->mmio_base + PWMSS_CLKSTATUS);
+}
+EXPORT_SYMBOL(pwmss_submodule_state_change);
+
+static const struct of_device_id pwmss_of_match[] = {
+       { .compatible   = "ti,am33xx-pwmss" },
+       {},
+};
+MODULE_DEVICE_TABLE(of, pwmss_of_match);
+
+static int pwmss_probe(struct platform_device *pdev)
+{
+       int ret;
+       struct resource *r;
+       struct pwmss_info *info;
+       struct device_node *node = pdev->dev.of_node;
+
+       info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+       if (!info)
+               return -ENOMEM;
+
+       mutex_init(&info->pwmss_lock);
+
+       r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       info->mmio_base = devm_ioremap_resource(&pdev->dev, r);
+       if (IS_ERR(info->mmio_base))
+               return PTR_ERR(info->mmio_base);
+
+       pm_runtime_enable(&pdev->dev);
+       pm_runtime_get_sync(&pdev->dev);
+       platform_set_drvdata(pdev, info);
+
+       /* Populate all the child nodes here... */
+       ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
+       if (ret)
+               dev_err(&pdev->dev, "no child node found\n");
+
+       return ret;
+}
+
+static int pwmss_remove(struct platform_device *pdev)
+{
+       struct pwmss_info *info = platform_get_drvdata(pdev);
+
+       pm_runtime_put_sync(&pdev->dev);
+       pm_runtime_disable(&pdev->dev);
+       mutex_destroy(&info->pwmss_lock);
+       return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pwmss_suspend(struct device *dev)
+{
+       struct pwmss_info *info = dev_get_drvdata(dev);
+
+       info->pwmss_clkconfig = readw(info->mmio_base + PWMSS_CLKCONFIG);
+       pm_runtime_put_sync(dev);
+       return 0;
+}
+
+static int pwmss_resume(struct device *dev)
+{
+       struct pwmss_info *info = dev_get_drvdata(dev);
+
+       pm_runtime_get_sync(dev);
+       writew(info->pwmss_clkconfig, info->mmio_base + PWMSS_CLKCONFIG);
+       return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pwmss_pm_ops, pwmss_suspend, pwmss_resume);
+
+static struct platform_driver pwmss_driver = {
+       .driver = {
+               .name   = "pwmss",
+               .pm     = &pwmss_pm_ops,
+               .of_match_table = pwmss_of_match,
+       },
+       .probe  = pwmss_probe,
+       .remove = pwmss_remove,
+};
+
+module_platform_driver(pwmss_driver);
+
+MODULE_DESCRIPTION("PWM Subsystem driver");
+MODULE_AUTHOR("Texas Instruments");
+MODULE_LICENSE("GPL");