hwrng: pixocell - add support for picoxcell TRNG

This driver adds support for the True Random Number Generator in
the Picochip PC3X3 and later devices.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 221 insertions, 0 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index d31483c54883..beecd1cf9b99 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -198,3 +198,15 @@ config HW_RANDOM_NOMADIK
           module will be called nomadik-rng.
 
           If unsure, say Y.
+
+config HW_RANDOM_PICOXCELL
+        tristate "Picochip picoXcell true random number generator support"
+        depends on HW_RANDOM && ARCH_PICOXCELL && PICOXCELL_PC3X3
+        ---help---
+          This driver provides kernel-side support for the Random Number
+          Generator hardware found on Picochip PC3x3 and later devices.
+
+          To compile this driver as a module, choose M here: the
+          module will be called picoxcell-rng.
+
+          If unsure, say Y.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index 4273308aa1e3..3db4eb8b19c0 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_HW_RANDOM_TX4939) += tx4939-rng.o
 obj-$(CONFIG_HW_RANDOM_MXC_RNGA) += mxc-rnga.o
 obj-$(CONFIG_HW_RANDOM_OCTEON) += octeon-rng.o
 obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o
+obj-$(CONFIG_HW_RANDOM_PICOXCELL) += picoxcell-rng.o
diff --git a/drivers/char/hw_random/picoxcell-rng.c b/drivers/char/hw_random/picoxcell-rng.c
new file mode 100644
index 000000000000..990d55a5e3e8
--- /dev/null
+++ b/drivers/char/hw_random/picoxcell-rng.c
@@ -0,0 +1,208 @@
+/*
+ * Copyright (c) 2010-2011 Picochip Ltd., Jamie Iles
+ *
+ * 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.
+ *
+ * All enquiries to support@picochip.com
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/hw_random.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#define DATA_REG_OFFSET         0x0200
+#define CSR_REG_OFFSET          0x0278
+#define CSR_OUT_EMPTY_MASK      (1 << 24)
+#define CSR_FAULT_MASK          (1 << 1)
+#define TRNG_BLOCK_RESET_MASK   (1 << 0)
+#define TAI_REG_OFFSET          0x0380
+
+/*
+ * The maximum amount of time in microseconds to spend waiting for data if the
+ * core wants us to wait.  The TRNG should generate 32 bits every 320ns so a
+ * timeout of 20us seems reasonable.  The TRNG does builtin tests of the data
+ * for randomness so we can't always assume there is data present.
+ */
+#define PICO_TRNG_TIMEOUT               20
+
+static void __iomem *rng_base;
+static struct clk *rng_clk;
+struct device *rng_dev;
+
+static inline u32 picoxcell_trng_read_csr(void)
+{
+        return __raw_readl(rng_base + CSR_REG_OFFSET);
+}
+
+static inline bool picoxcell_trng_is_empty(void)
+{
+        return picoxcell_trng_read_csr() & CSR_OUT_EMPTY_MASK;
+}
+
+/*
+ * Take the random number generator out of reset and make sure the interrupts
+ * are masked. We shouldn't need to get large amounts of random bytes so just
+ * poll the status register. The hardware generates 32 bits every 320ns so we
+ * shouldn't have to wait long enough to warrant waiting for an IRQ.
+ */
+static void picoxcell_trng_start(void)
+{
+        __raw_writel(0, rng_base + TAI_REG_OFFSET);
+        __raw_writel(0, rng_base + CSR_REG_OFFSET);
+}
+
+static void picoxcell_trng_reset(void)
+{
+        __raw_writel(TRNG_BLOCK_RESET_MASK, rng_base + CSR_REG_OFFSET);
+        __raw_writel(TRNG_BLOCK_RESET_MASK, rng_base + TAI_REG_OFFSET);
+        picoxcell_trng_start();
+}
+
+/*
+ * Get some random data from the random number generator. The hw_random core
+ * layer provides us with locking.
+ */
+static int picoxcell_trng_read(struct hwrng *rng, void *buf, size_t max,
+                               bool wait)
+{
+        int i;
+
+        /* Wait for some data to become available. */
+        for (i = 0; i < PICO_TRNG_TIMEOUT && picoxcell_trng_is_empty(); ++i) {
+                if (!wait)
+                        return 0;
+
+                udelay(1);
+        }
+
+        if (picoxcell_trng_read_csr() & CSR_FAULT_MASK) {
+                dev_err(rng_dev, "fault detected, resetting TRNG\n");
+                picoxcell_trng_reset();
+                return -EIO;
+        }
+
+        if (i == PICO_TRNG_TIMEOUT)
+                return 0;
+
+        *(u32 *)buf = __raw_readl(rng_base + DATA_REG_OFFSET);
+        return sizeof(u32);
+}
+
+static struct hwrng picoxcell_trng = {
+        .name           = "picoxcell",
+        .read           = picoxcell_trng_read,
+};
+
+static int picoxcell_trng_probe(struct platform_device *pdev)
+{
+        int ret;
+        struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        if (!mem) {
+                dev_warn(&pdev->dev, "no memory resource\n");
+                return -ENOMEM;
+        }
+
+        if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
+                                     "picoxcell_trng")) {
+                dev_warn(&pdev->dev, "unable to request io mem\n");
+                return -EBUSY;
+        }
+
+        rng_base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+        if (!rng_base) {
+                dev_warn(&pdev->dev, "unable to remap io mem\n");
+                return -ENOMEM;
+        }
+
+        rng_clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(rng_clk)) {
+                dev_warn(&pdev->dev, "no clk\n");
+                return PTR_ERR(rng_clk);
+        }
+
+        ret = clk_enable(rng_clk);
+        if (ret) {
+                dev_warn(&pdev->dev, "unable to enable clk\n");
+                goto err_enable;
+        }
+
+        picoxcell_trng_start();
+        ret = hwrng_register(&picoxcell_trng);
+        if (ret)
+                goto err_register;
+
+        rng_dev = &pdev->dev;
+        dev_info(&pdev->dev, "pixoxcell random number generator active\n");
+
+        return 0;
+
+err_register:
+        clk_disable(rng_clk);
+err_enable:
+        clk_put(rng_clk);
+
+        return ret;
+}
+
+static int __devexit picoxcell_trng_remove(struct platform_device *pdev)
+{
+        hwrng_unregister(&picoxcell_trng);
+        clk_disable(rng_clk);
+        clk_put(rng_clk);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int picoxcell_trng_suspend(struct device *dev)
+{
+        clk_disable(rng_clk);
+
+        return 0;
+}
+
+static int picoxcell_trng_resume(struct device *dev)
+{
+        return clk_enable(rng_clk);
+}
+
+static const struct dev_pm_ops picoxcell_trng_pm_ops = {
+        .suspend        = picoxcell_trng_suspend,
+        .resume         = picoxcell_trng_resume,
+};
+#endif /* CONFIG_PM */
+
+static struct platform_driver picoxcell_trng_driver = {
+        .probe          = picoxcell_trng_probe,
+        .remove         = __devexit_p(picoxcell_trng_remove),
+        .driver         = {
+                .name   = "picoxcell-trng",
+                .owner  = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm     = &picoxcell_trng_pm_ops,
+#endif /* CONFIG_PM */
+        },
+};
+
+static int __init picoxcell_trng_init(void)
+{
+        return platform_driver_register(&picoxcell_trng_driver);
+}
+module_init(picoxcell_trng_init);
+
+static void __exit picoxcell_trng_exit(void)
+{
+        platform_driver_unregister(&picoxcell_trng_driver);
+}
+module_exit(picoxcell_trng_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamie Iles");
+MODULE_DESCRIPTION("Picochip picoXcell TRNG driver");