[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/drivers/misc/atmel-ssc.c b/ap/os/linux/linux-3.4.x/drivers/misc/atmel-ssc.c
new file mode 100644
index 0000000..5bb1877
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/misc/atmel-ssc.c
@@ -0,0 +1,177 @@
+/*
+ * Atmel SSC driver
+ *
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * 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.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/atmel-ssc.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+/* Serialize access to ssc_list and user count */
+static DEFINE_SPINLOCK(user_lock);
+static LIST_HEAD(ssc_list);
+
+struct ssc_device *ssc_request(unsigned int ssc_num)
+{
+ int ssc_valid = 0;
+ struct ssc_device *ssc;
+
+ spin_lock(&user_lock);
+ list_for_each_entry(ssc, &ssc_list, list) {
+ if (ssc->pdev->id == ssc_num) {
+ ssc_valid = 1;
+ break;
+ }
+ }
+
+ if (!ssc_valid) {
+ spin_unlock(&user_lock);
+ pr_err("ssc: ssc%d platform device is missing\n", ssc_num);
+ return ERR_PTR(-ENODEV);
+ }
+
+ if (ssc->user) {
+ spin_unlock(&user_lock);
+ dev_dbg(&ssc->pdev->dev, "module busy\n");
+ return ERR_PTR(-EBUSY);
+ }
+ ssc->user++;
+ spin_unlock(&user_lock);
+
+ clk_enable(ssc->clk);
+
+ return ssc;
+}
+EXPORT_SYMBOL(ssc_request);
+
+void ssc_free(struct ssc_device *ssc)
+{
+ spin_lock(&user_lock);
+ if (ssc->user) {
+ ssc->user--;
+ clk_disable(ssc->clk);
+ } else {
+ dev_dbg(&ssc->pdev->dev, "device already free\n");
+ }
+ spin_unlock(&user_lock);
+}
+EXPORT_SYMBOL(ssc_free);
+
+static int __init ssc_probe(struct platform_device *pdev)
+{
+ int retval = 0;
+ struct resource *regs;
+ struct ssc_device *ssc;
+
+ ssc = kzalloc(sizeof(struct ssc_device), GFP_KERNEL);
+ if (!ssc) {
+ dev_dbg(&pdev->dev, "out of memory\n");
+ retval = -ENOMEM;
+ goto out;
+ }
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs) {
+ dev_dbg(&pdev->dev, "no mmio resource defined\n");
+ retval = -ENXIO;
+ goto out_free;
+ }
+
+ ssc->clk = clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(ssc->clk)) {
+ dev_dbg(&pdev->dev, "no pclk clock defined\n");
+ retval = -ENXIO;
+ goto out_free;
+ }
+
+ ssc->pdev = pdev;
+ ssc->regs = ioremap(regs->start, resource_size(regs));
+ if (!ssc->regs) {
+ dev_dbg(&pdev->dev, "ioremap failed\n");
+ retval = -EINVAL;
+ goto out_clk;
+ }
+
+ /* disable all interrupts */
+ clk_enable(ssc->clk);
+ ssc_writel(ssc->regs, IDR, ~0UL);
+ ssc_readl(ssc->regs, SR);
+ clk_disable(ssc->clk);
+
+ ssc->irq = platform_get_irq(pdev, 0);
+ if (!ssc->irq) {
+ dev_dbg(&pdev->dev, "could not get irq\n");
+ retval = -ENXIO;
+ goto out_unmap;
+ }
+
+ spin_lock(&user_lock);
+ list_add_tail(&ssc->list, &ssc_list);
+ spin_unlock(&user_lock);
+
+ platform_set_drvdata(pdev, ssc);
+
+ dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n",
+ ssc->regs, ssc->irq);
+
+ goto out;
+
+out_unmap:
+ iounmap(ssc->regs);
+out_clk:
+ clk_put(ssc->clk);
+out_free:
+ kfree(ssc);
+out:
+ return retval;
+}
+
+static int __devexit ssc_remove(struct platform_device *pdev)
+{
+ struct ssc_device *ssc = platform_get_drvdata(pdev);
+
+ spin_lock(&user_lock);
+ iounmap(ssc->regs);
+ clk_put(ssc->clk);
+ list_del(&ssc->list);
+ kfree(ssc);
+ spin_unlock(&user_lock);
+
+ return 0;
+}
+
+static struct platform_driver ssc_driver = {
+ .remove = __devexit_p(ssc_remove),
+ .driver = {
+ .name = "ssc",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init ssc_init(void)
+{
+ return platform_driver_probe(&ssc_driver, ssc_probe);
+}
+module_init(ssc_init);
+
+static void __exit ssc_exit(void)
+{
+ platform_driver_unregister(&ssc_driver);
+}
+module_exit(ssc_exit);
+
+MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
+MODULE_DESCRIPTION("SSC driver for Atmel AVR32 and AT91");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ssc");