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authorLinus Torvalds <torvalds@linux-foundation.org>2011-11-01 20:16:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-01 20:16:43 -0700
commit25498e5b3df931a3d52a6e0642ae242e4ee19488 (patch)
tree5a627d71015fde644d8c61a04f7718c2f0a748db /drivers/char
parent952414505f55afe5cd6dc004765076aa22b3ed7e (diff)
parent995a0605a6665858d73f9e80053414909be33f27 (diff)
downloadop-kernel-dev-25498e5b3df931a3d52a6e0642ae242e4ee19488.zip
op-kernel-dev-25498e5b3df931a3d52a6e0642ae242e4ee19488.tar.gz
Merge branch 'next/driver' of git://git.linaro.org/people/arnd/arm-soc
* 'next/driver' of git://git.linaro.org/people/arnd/arm-soc: hw_random: add driver for atmel true hardware random number generator ARM: at91: at91sam9g45: add trng clock and platform device MX53 Enable the AHCI SATA on MX53 SMD board MX53 Enable the AHCI SATA on MX53 LOCO board MX53 Enable the AHCI SATA on MX53 ARD board AHCI Add the AHCI SATA feature on the MX53 platforms Fix pata imx resource ARM: imx: Define functions for registering PATA ARM: imx: Add PATA clock support ARM: imx: Add PATA resources for other i.MX processors imx: efika: Enable pata. imx51: add pata clock imx51: add pata device Fix up trivial conflict (new selects next to each other from separate branches for EFIKA_COMMON) in arch/arm/mach-mx5/Kconfig
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/hw_random/Kconfig13
-rw-r--r--drivers/char/hw_random/Makefile1
-rw-r--r--drivers/char/hw_random/atmel-rng.c158
3 files changed, 172 insertions, 0 deletions
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index 1d2ebc7..e013587 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -60,6 +60,19 @@ config HW_RANDOM_AMD
If unsure, say Y.
+config HW_RANDOM_ATMEL
+ tristate "Atmel Random Number Generator support"
+ depends on HW_RANDOM && ARCH_AT91SAM9G45
+ default HW_RANDOM
+ ---help---
+ This driver provides kernel-side support for the Random Number
+ Generator hardware found on Atmel AT91 devices.
+
+ To compile this driver as a module, choose M here: the
+ module will be called atmel-rng.
+
+ If unsure, say Y.
+
config HW_RANDOM_GEODE
tristate "AMD Geode HW Random Number Generator support"
depends on HW_RANDOM && X86_32 && PCI
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index c88f244..b2ff526 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -7,6 +7,7 @@ rng-core-y := core.o
obj-$(CONFIG_HW_RANDOM_TIMERIOMEM) += timeriomem-rng.o
obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o
obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o
+obj-$(CONFIG_HW_RANDOM_ATMEL) += atmel-rng.o
obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o
obj-$(CONFIG_HW_RANDOM_N2RNG) += n2-rng.o
n2-rng-y := n2-drv.o n2-asm.o
diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
new file mode 100644
index 0000000..241df2e
--- /dev/null
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -0,0 +1,158 @@
+/*
+ * 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/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_ODATA) & 1) {
+ *data = readl(trng->base + TRNG_ODATA);
+ return 4;
+ } else
+ return 0;
+}
+
+static int atmel_trng_probe(struct platform_device *pdev)
+{
+ struct atmel_trng *trng;
+ struct resource *res;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL);
+ if (!trng)
+ return -ENOMEM;
+
+ if (!devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res), pdev->name))
+ return -EBUSY;
+
+ trng->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!trng->base)
+ return -EBUSY;
+
+ trng->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(trng->clk))
+ return PTR_ERR(trng->clk);
+
+ ret = clk_enable(trng->clk);
+ if (ret)
+ goto err_enable;
+
+ writel(TRNG_KEY | 1, trng->base + TRNG_CR);
+ trng->rng.name = pdev->name;
+ trng->rng.read = atmel_trng_read;
+
+ ret = hwrng_register(&trng->rng);
+ if (ret)
+ goto err_register;
+
+ platform_set_drvdata(pdev, trng);
+
+ return 0;
+
+err_register:
+ clk_disable(trng->clk);
+err_enable:
+ clk_put(trng->clk);
+
+ return ret;
+}
+
+static int __devexit atmel_trng_remove(struct platform_device *pdev)
+{
+ struct atmel_trng *trng = platform_get_drvdata(pdev);
+
+ hwrng_unregister(&trng->rng);
+
+ writel(TRNG_KEY, trng->base + TRNG_CR);
+ clk_disable(trng->clk);
+ clk_put(trng->clk);
+
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int atmel_trng_suspend(struct device *dev)
+{
+ struct atmel_trng *trng = dev_get_drvdata(dev);
+
+ clk_disable(trng->clk);
+
+ return 0;
+}
+
+static int atmel_trng_resume(struct device *dev)
+{
+ struct atmel_trng *trng = dev_get_drvdata(dev);
+
+ return clk_enable(trng->clk);
+}
+
+static const struct dev_pm_ops atmel_trng_pm_ops = {
+ .suspend = atmel_trng_suspend,
+ .resume = atmel_trng_resume,
+};
+#endif /* CONFIG_PM */
+
+static struct platform_driver atmel_trng_driver = {
+ .probe = atmel_trng_probe,
+ .remove = __devexit_p(atmel_trng_remove),
+ .driver = {
+ .name = "atmel-trng",
+ .owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &atmel_trng_pm_ops,
+#endif /* CONFIG_PM */
+ },
+};
+
+static int __init atmel_trng_init(void)
+{
+ return platform_driver_register(&atmel_trng_driver);
+}
+module_init(atmel_trng_init);
+
+static void __exit atmel_trng_exit(void)
+{
+ platform_driver_unregister(&atmel_trng_driver);
+}
+module_exit(atmel_trng_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
+MODULE_DESCRIPTION("Atmel true random number generator driver");
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