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hw_random: add Broadcom BCM63xx RNG driver

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Signed-off-by: Florian Fainelli <florian@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: mpm@selenic.com
Cc: herbert@gondor.apana.org.au
Patchwork: https://patchwork.linux-mips.org/patch/3327/
Patchwork: https://patchwork.linux-mips.org/patch/4072/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Florian Fainelli 2012-07-24 16:33:11 +02:00 committed by Ralf Baechle
parent b73ab84199
commit 553072b27e
3 changed files with 190 additions and 0 deletions
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14
drivers/char/hw_random/Kconfig
View File

@ -73,6 +73,20 @@ config HW_RANDOM_ATMEL
If unsure, say Y.
config HW_RANDOM_BCM63XX
tristate "Broadcom BCM63xx Random Number Generator support"
depends on HW_RANDOM && BCM63XX
default HW_RANDOM
---help---
This driver provides kernel-side support for the Random Number
Generator hardware found on the Broadcom BCM63xx SoCs.
To compile this driver as a module, choose M here: the
module will be called bcm63xx-rng
If unusure, say Y.
config HW_RANDOM_GEODE
tristate "AMD Geode HW Random Number Generator support"
depends on HW_RANDOM && X86_32 && PCI

1
drivers/char/hw_random/Makefile
View File

@ -8,6 +8,7 @@ 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-$(CONFIG_HW_RANDOM_BCM63XX) += bcm63xx-rng.o
obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o
obj-$(CONFIG_HW_RANDOM_N2RNG) += n2-rng.o
n2-rng-y := n2-drv.o n2-asm.o

175
drivers/char/hw_random/bcm63xx-rng.c Normal file
View File

@ -0,0 +1,175 @@
/*
* Broadcom BCM63xx Random Number Generator support
*
* Copyright (C) 2011, Florian Fainelli <florian@openwrt.org>
* Copyright (C) 2009, Broadcom Corporation
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/hw_random.h>
#include <bcm63xx_io.h>
#include <bcm63xx_regs.h>
struct bcm63xx_rng_priv {
struct clk *clk;
void __iomem *regs;
};
#define to_rng_priv(rng) ((struct bcm63xx_rng_priv *)rng->priv)
static int bcm63xx_rng_init(struct hwrng *rng)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
u32 val;
val = bcm_readl(priv->regs + RNG_CTRL);
val |= RNG_EN;
bcm_writel(val, priv->regs + RNG_CTRL);
return 0;
}
static void bcm63xx_rng_cleanup(struct hwrng *rng)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
u32 val;
val = bcm_readl(priv->regs + RNG_CTRL);
val &= ~RNG_EN;
bcm_writel(val, priv->regs + RNG_CTRL);
}
static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
return bcm_readl(priv->regs + RNG_STAT) & RNG_AVAIL_MASK;
}
static int bcm63xx_rng_data_read(struct hwrng *rng, u32 *data)
{
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
*data = bcm_readl(priv->regs + RNG_DATA);
return 4;
}
static int __devinit bcm63xx_rng_probe(struct platform_device *pdev)
{
struct resource *r;
struct clk *clk;
int ret;
struct bcm63xx_rng_priv *priv;
struct hwrng *rng;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(&pdev->dev, "no iomem resource\n");
ret = -ENXIO;
goto out;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "no memory for private structure\n");
ret = -ENOMEM;
goto out;
}
rng = kzalloc(sizeof(*rng), GFP_KERNEL);
if (!rng) {
dev_err(&pdev->dev, "no memory for rng structure\n");
ret = -ENOMEM;
goto out_free_priv;
}
platform_set_drvdata(pdev, rng);
rng->priv = (unsigned long)priv;
rng->name = pdev->name;
rng->init = bcm63xx_rng_init;
rng->cleanup = bcm63xx_rng_cleanup;
rng->data_present = bcm63xx_rng_data_present;
rng->data_read = bcm63xx_rng_data_read;
clk = clk_get(&pdev->dev, "ipsec");
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "no clock for device\n");
ret = PTR_ERR(clk);
goto out_free_rng;
}
priv->clk = clk;
if (!devm_request_mem_region(&pdev->dev, r->start,
resource_size(r), pdev->name)) {
dev_err(&pdev->dev, "request mem failed");
ret = -ENOMEM;
goto out_free_rng;
}
priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
resource_size(r));
if (!priv->regs) {
dev_err(&pdev->dev, "ioremap failed");
ret = -ENOMEM;
goto out_free_rng;
}
clk_enable(clk);
ret = hwrng_register(rng);
if (ret) {
dev_err(&pdev->dev, "failed to register rng device\n");
goto out_clk_disable;
}
dev_info(&pdev->dev, "registered RNG driver\n");
return 0;
out_clk_disable:
clk_disable(clk);
out_free_rng:
platform_set_drvdata(pdev, NULL);
kfree(rng);
out_free_priv:
kfree(priv);
out:
return ret;
}
static int __devexit bcm63xx_rng_remove(struct platform_device *pdev)
{
struct hwrng *rng = platform_get_drvdata(pdev);
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
hwrng_unregister(rng);
clk_disable(priv->clk);
kfree(priv);
kfree(rng);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver bcm63xx_rng_driver = {
.probe = bcm63xx_rng_probe,
.remove = __devexit_p(bcm63xx_rng_remove),
.driver = {
.name = "bcm63xx-rng",
.owner = THIS_MODULE,
},
};
module_platform_driver(bcm63xx_rng_driver);
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
MODULE_LICENSE("GPL");