1 files changed, 132 insertions, 0 deletions
diff --git a/arch/sh/drivers/heartbeat.c b/arch/sh/drivers/heartbeat.c
new file mode 100644
index 00000000000..bc59cb6cd78
--- /dev/null
+++ b/arch/sh/drivers/heartbeat.c
@@ -0,0 +1,132 @@
+/*
+ * Generic heartbeat driver for regular LED banks
+ *
+ * Copyright (C) 2007  Paul Mundt
+ *
+ * Most SH reference boards include a number of individual LEDs that can
+ * be independently controlled (either via a pre-defined hardware
+ * function or via the LED class, if desired -- the hardware tends to
+ * encapsulate some of the same "triggers" that the LED class supports,
+ * so there's not too much value in it).
+ *
+ * Additionally, most of these boards also have a LED bank that we've
+ * traditionally used for strobing the load average. This use case is
+ * handled by this driver, rather than giving each LED bit position its
+ * own struct device.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/io.h>
+
+#define DRV_NAME "heartbeat"
+#define DRV_VERSION "0.1.0"
+
+struct heartbeat_data {
+	void __iomem *base;
+	unsigned char bit_pos[8];
+	struct timer_list timer;
+};
+
+static void heartbeat_timer(unsigned long data)
+{
+	struct heartbeat_data *hd = (struct heartbeat_data *)data;
+	static unsigned bit = 0, up = 1;
+
+	ctrl_outw(1 << hd->bit_pos[bit], (unsigned long)hd->base);
+	if (up)
+		if (bit == (ARRAY_SIZE(hd->bit_pos) - 1)) {
+			bit--;
+			up = 0;
+		} else
+			bit++;
+	else if (bit == 0)
+		up = 1;
+	else
+		bit--;
+
+	mod_timer(&hd->timer, jiffies + (110 - ((300 << FSHIFT) /
+			((avenrun[0] / 5) + (3 << FSHIFT)))));
+}
+
+static int heartbeat_drv_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct heartbeat_data *hd;
+
+	if (unlikely(pdev->num_resources != 1)) {
+		dev_err(&pdev->dev, "invalid number of resources\n");
+		return -EINVAL;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (unlikely(res == NULL)) {
+		dev_err(&pdev->dev, "invalid resource\n");
+		return -EINVAL;
+	}
+
+	hd = kmalloc(sizeof(struct heartbeat_data), GFP_KERNEL);
+	if (unlikely(!hd))
+		return -ENOMEM;
+
+	if (pdev->dev.platform_data) {
+		memcpy(hd->bit_pos, pdev->dev.platform_data,
+		       ARRAY_SIZE(hd->bit_pos));
+	} else {
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(hd->bit_pos); i++)
+			hd->bit_pos[i] = i;
+	}
+
+	hd->base = (void __iomem *)res->start;
+
+	setup_timer(&hd->timer, heartbeat_timer, (unsigned long)hd);
+	platform_set_drvdata(pdev, hd);
+
+	return mod_timer(&hd->timer, jiffies + 1);
+}
+
+static int heartbeat_drv_remove(struct platform_device *pdev)
+{
+	struct heartbeat_data *hd = platform_get_drvdata(pdev);
+
+	del_timer_sync(&hd->timer);
+
+	platform_set_drvdata(pdev, NULL);
+
+	kfree(hd);
+
+	return 0;
+}
+
+static struct platform_driver heartbeat_driver = {
+	.probe		= heartbeat_drv_probe,
+	.remove		= heartbeat_drv_remove,
+	.driver		= {
+		.name	= DRV_NAME,
+	},
+};
+
+static int __init heartbeat_init(void)
+{
+	printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
+	return platform_driver_register(&heartbeat_driver);
+}
+
+static void __exit heartbeat_exit(void)
+{
+	platform_driver_unregister(&heartbeat_driver);
+}
+module_init(heartbeat_init);
+module_exit(heartbeat_exit);
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Paul Mundt");
+MODULE_LICENSE("GPLv2");