i.MX31: Add hw-random for RNGA

This hw-random driver add support to RNGA hardware found
on some i.MX processors.

Signed-off-by: Alan Carvalho de Assis <acassis@gmail.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 247 insertions, 0 deletions

diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
new file mode 100644
index 000000000000..187c6be80f43
--- /dev/null
+++ b/drivers/char/hw_random/mxc-rnga.c
@@ -0,0 +1,247 @@
+/*
+ * RNG driver for Freescale RNGA
+ *
+ * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Author: Alan Carvalho de Assis <acassis@gmail.com>
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * This driver is based on other RNG drivers.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+
+/* RNGA Registers */
+#define RNGA_CONTROL                    0x00
+#define RNGA_STATUS                     0x04
+#define RNGA_ENTROPY                    0x08
+#define RNGA_OUTPUT_FIFO                0x0c
+#define RNGA_MODE                       0x10
+#define RNGA_VERIFICATION_CONTROL       0x14
+#define RNGA_OSC_CONTROL_COUNTER        0x18
+#define RNGA_OSC1_COUNTER               0x1c
+#define RNGA_OSC2_COUNTER               0x20
+#define RNGA_OSC_COUNTER_STATUS         0x24
+
+/* RNGA Registers Range */
+#define RNG_ADDR_RANGE                  0x28
+
+/* RNGA Control Register */
+#define RNGA_CONTROL_SLEEP              0x00000010
+#define RNGA_CONTROL_CLEAR_INT          0x00000008
+#define RNGA_CONTROL_MASK_INTS          0x00000004
+#define RNGA_CONTROL_HIGH_ASSURANCE     0x00000002
+#define RNGA_CONTROL_GO                 0x00000001
+
+#define RNGA_STATUS_LEVEL_MASK          0x0000ff00
+
+/* RNGA Status Register */
+#define RNGA_STATUS_OSC_DEAD            0x80000000
+#define RNGA_STATUS_SLEEP               0x00000010
+#define RNGA_STATUS_ERROR_INT           0x00000008
+#define RNGA_STATUS_FIFO_UNDERFLOW      0x00000004
+#define RNGA_STATUS_LAST_READ_STATUS    0x00000002
+#define RNGA_STATUS_SECURITY_VIOLATION  0x00000001
+
+static struct platform_device *rng_dev;
+
+static int mxc_rnga_data_present(struct hwrng *rng)
+{
+        int level;
+        void __iomem *rng_base = (void __iomem *)rng->priv;
+
+        /* how many random numbers is in FIFO? [0-16] */
+        level = ((__raw_readl(rng_base + RNGA_STATUS) &
+                        RNGA_STATUS_LEVEL_MASK) >> 8);
+
+        return level > 0 ? 1 : 0;
+}
+
+static int mxc_rnga_data_read(struct hwrng *rng, u32 * data)
+{
+        int err;
+        u32 ctrl;
+        void __iomem *rng_base = (void __iomem *)rng->priv;
+
+        /* retrieve a random number from FIFO */
+        *data = __raw_readl(rng_base + RNGA_OUTPUT_FIFO);
+
+        /* some error while reading this random number? */
+        err = __raw_readl(rng_base + RNGA_STATUS) & RNGA_STATUS_ERROR_INT;
+
+        /* if error: clear error interrupt, but doesn't return random number */
+        if (err) {
+                dev_dbg(&rng_dev->dev, "Error while reading random number!\n");
+                ctrl = __raw_readl(rng_base + RNGA_CONTROL);
+                __raw_writel(ctrl | RNGA_CONTROL_CLEAR_INT,
+                                        rng_base + RNGA_CONTROL);
+                return 0;
+        } else
+                return 4;
+}
+
+static int mxc_rnga_init(struct hwrng *rng)
+{
+        u32 ctrl, osc;
+        void __iomem *rng_base = (void __iomem *)rng->priv;
+
+        /* wake up */
+        ctrl = __raw_readl(rng_base + RNGA_CONTROL);
+        __raw_writel(ctrl & ~RNGA_CONTROL_SLEEP, rng_base + RNGA_CONTROL);
+
+        /* verify if oscillator is working */
+        osc = __raw_readl(rng_base + RNGA_STATUS);
+        if (osc & RNGA_STATUS_OSC_DEAD) {
+                dev_err(&rng_dev->dev, "RNGA Oscillator is dead!\n");
+                return -ENODEV;
+        }
+
+        /* go running */
+        ctrl = __raw_readl(rng_base + RNGA_CONTROL);
+        __raw_writel(ctrl | RNGA_CONTROL_GO, rng_base + RNGA_CONTROL);
+
+        return 0;
+}
+
+static void mxc_rnga_cleanup(struct hwrng *rng)
+{
+        u32 ctrl;
+        void __iomem *rng_base = (void __iomem *)rng->priv;
+
+        ctrl = __raw_readl(rng_base + RNGA_CONTROL);
+
+        /* stop rnga */
+        __raw_writel(ctrl & ~RNGA_CONTROL_GO, rng_base + RNGA_CONTROL);
+}
+
+static struct hwrng mxc_rnga = {
+        .name = "mxc-rnga",
+        .init = mxc_rnga_init,
+        .cleanup = mxc_rnga_cleanup,
+        .data_present = mxc_rnga_data_present,
+        .data_read = mxc_rnga_data_read
+};
+
+static int __init mxc_rnga_probe(struct platform_device *pdev)
+{
+        int err = -ENODEV;
+        struct clk *clk;
+        struct resource *res, *mem;
+        void __iomem *rng_base = NULL;
+
+        if (rng_dev)
+                return -EBUSY;
+
+        clk = clk_get(&pdev->dev, "rng");
+        if (IS_ERR(clk)) {
+                dev_err(&pdev->dev, "Could not get rng_clk!\n");
+                err = PTR_ERR(clk);
+                goto out;
+        }
+
+        clk_enable(clk);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                err = -ENOENT;
+                goto err_region;
+        }
+
+        mem = request_mem_region(res->start, resource_size(res), pdev->name);
+        if (mem == NULL) {
+                err = -EBUSY;
+                goto err_region;
+        }
+
+        rng_base = ioremap(res->start, resource_size(res));
+        if (!rng_base) {
+                err = -ENOMEM;
+                goto err_ioremap;
+        }
+
+        mxc_rnga.priv = (unsigned long)rng_base;
+
+        err = hwrng_register(&mxc_rnga);
+        if (err) {
+                dev_err(&pdev->dev, "MXC RNGA registering failed (%d)\n", err);
+                goto err_register;
+        }
+
+        rng_dev = pdev;
+
+        dev_info(&pdev->dev, "MXC RNGA Registered.\n");
+
+        return 0;
+
+err_register:
+        iounmap(rng_base);
+        rng_base = NULL;
+
+err_ioremap:
+        release_mem_region(res->start, resource_size(res));
+
+err_region:
+        clk_disable(clk);
+        clk_put(clk);
+
+out:
+        return err;
+}
+
+static int __exit mxc_rnga_remove(struct platform_device *pdev)
+{
+        struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        void __iomem *rng_base = (void __iomem *)mxc_rnga.priv;
+        struct clk *clk = clk_get(&pdev->dev, "rng");
+
+        hwrng_unregister(&mxc_rnga);
+
+        iounmap(rng_base);
+
+        release_mem_region(res->start, resource_size(res));
+
+        clk_disable(clk);
+        clk_put(clk);
+
+        return 0;
+}
+
+static struct platform_driver mxc_rnga_driver = {
+        .driver = {
+                   .name = "mxc_rnga",
+                   .owner = THIS_MODULE,
+                   },
+        .remove = __exit_p(mxc_rnga_remove),
+};
+
+static int __init mod_init(void)
+{
+        return platform_driver_probe(&mxc_rnga_driver, mxc_rnga_probe);
+}
+
+static void __exit mod_exit(void)
+{
+        platform_driver_unregister(&mxc_rnga_driver);
+}
+
+module_init(mod_init);
+module_exit(mod_exit);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("H/W RNGA driver for i.MX");
+MODULE_LICENSE("GPL");