ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/char/hw_random/atmel-rng.c b/marvell/linux/drivers/char/hw_random/atmel-rng.c
new file mode 100644
index 0000000..f4c94f8
--- /dev/null
+++ b/marvell/linux/drivers/char/hw_random/atmel-rng.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2011 Peter Korsgaard <jacmet@sunsite.dk>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/hw_random.h>
+#include <linux/platform_device.h>
+
+#define TRNG_CR 0x00
+#define TRNG_ISR 0x1c
+#define TRNG_ODATA 0x50
+
+#define TRNG_KEY 0x524e4700 /* RNG */
+
+struct atmel_trng {
+ struct clk *clk;
+ void __iomem *base;
+ struct hwrng rng;
+};
+
+static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max,
+ bool wait)
+{
+ struct atmel_trng *trng = container_of(rng, struct atmel_trng, rng);
+ u32 *data = buf;
+
+ /* data ready? */
+ if (readl(trng->base + TRNG_ISR) & 1) {
+ *data = readl(trng->base + TRNG_ODATA);
+ /*
+ ensure data ready is only set again AFTER the next data
+ word is ready in case it got set between checking ISR
+ and reading ODATA, so we don't risk re-reading the
+ same word
+ */
+ readl(trng->base + TRNG_ISR);
+ return 4;
+ } else
+ return 0;
+}
+
+static void atmel_trng_enable(struct atmel_trng *trng)
+{
+ writel(TRNG_KEY | 1, trng->base + TRNG_CR);
+}
+
+static void atmel_trng_disable(struct atmel_trng *trng)
+{
+ writel(TRNG_KEY, trng->base + TRNG_CR);
+}
+
+static int atmel_trng_probe(struct platform_device *pdev)
+{
+ struct atmel_trng *trng;
+ struct resource *res;
+ int ret;
+
+ trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+ if (!trng)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ trng->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(trng->base))
+ return PTR_ERR(trng->base);
+
+ trng->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(trng->clk))
+ return PTR_ERR(trng->clk);
+
+ ret = clk_prepare_enable(trng->clk);
+ if (ret)
+ return ret;
+
+ atmel_trng_enable(trng);
+ trng->rng.name = pdev->name;
+ trng->rng.read = atmel_trng_read;
+
+ ret = devm_hwrng_register(&pdev->dev, &trng->rng);
+ if (ret)
+ goto err_register;
+
+ platform_set_drvdata(pdev, trng);
+
+ return 0;
+
+err_register:
+ clk_disable_unprepare(trng->clk);
+ atmel_trng_disable(trng);
+ return ret;
+}
+
+static int atmel_trng_remove(struct platform_device *pdev)
+{
+ struct atmel_trng *trng = platform_get_drvdata(pdev);
+
+
+ atmel_trng_disable(trng);
+ clk_disable_unprepare(trng->clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int atmel_trng_suspend(struct device *dev)
+{
+ struct atmel_trng *trng = dev_get_drvdata(dev);
+
+ atmel_trng_disable(trng);
+ clk_disable_unprepare(trng->clk);
+
+ return 0;
+}
+
+static int atmel_trng_resume(struct device *dev)
+{
+ struct atmel_trng *trng = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(trng->clk);
+ if (ret)
+ return ret;
+
+ atmel_trng_enable(trng);
+
+ return 0;
+}
+
+static const struct dev_pm_ops atmel_trng_pm_ops = {
+ .suspend = atmel_trng_suspend,
+ .resume = atmel_trng_resume,
+};
+#endif /* CONFIG_PM */
+
+static const struct of_device_id atmel_trng_dt_ids[] = {
+ { .compatible = "atmel,at91sam9g45-trng" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, atmel_trng_dt_ids);
+
+static struct platform_driver atmel_trng_driver = {
+ .probe = atmel_trng_probe,
+ .remove = atmel_trng_remove,
+ .driver = {
+ .name = "atmel-trng",
+#ifdef CONFIG_PM
+ .pm = &atmel_trng_pm_ops,
+#endif /* CONFIG_PM */
+ .of_match_table = atmel_trng_dt_ids,
+ },
+};
+
+module_platform_driver(atmel_trng_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
+MODULE_DESCRIPTION("Atmel true random number generator driver");