mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 15:00:42 +07:00
47cd30608f
Adds missing include that resulted in implicit device tree functions errors.
Fixes: 7b65170671 ("hwrng: bcm63xx - add device tree support")
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/*
|
|
* 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 <linux/of.h>
|
|
|
|
#define RNG_CTRL 0x00
|
|
#define RNG_EN (1 << 0)
|
|
|
|
#define RNG_STAT 0x04
|
|
#define RNG_AVAIL_MASK (0xff000000)
|
|
|
|
#define RNG_DATA 0x08
|
|
#define RNG_THRES 0x0c
|
|
#define RNG_MASK 0x10
|
|
|
|
struct bcm63xx_rng_priv {
|
|
struct hwrng rng;
|
|
struct clk *clk;
|
|
void __iomem *regs;
|
|
};
|
|
|
|
#define to_rng_priv(rng) container_of(rng, struct bcm63xx_rng_priv, rng)
|
|
|
|
static int bcm63xx_rng_init(struct hwrng *rng)
|
|
{
|
|
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
|
|
u32 val;
|
|
int error;
|
|
|
|
error = clk_prepare_enable(priv->clk);
|
|
if (error)
|
|
return error;
|
|
|
|
val = __raw_readl(priv->regs + RNG_CTRL);
|
|
val |= RNG_EN;
|
|
__raw_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 = __raw_readl(priv->regs + RNG_CTRL);
|
|
val &= ~RNG_EN;
|
|
__raw_writel(val, priv->regs + RNG_CTRL);
|
|
|
|
clk_disable_unprepare(priv->clk);
|
|
}
|
|
|
|
static int bcm63xx_rng_data_present(struct hwrng *rng, int wait)
|
|
{
|
|
struct bcm63xx_rng_priv *priv = to_rng_priv(rng);
|
|
|
|
return __raw_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 = __raw_readl(priv->regs + RNG_DATA);
|
|
|
|
return 4;
|
|
}
|
|
|
|
static int bcm63xx_rng_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *r;
|
|
int ret;
|
|
struct bcm63xx_rng_priv *priv;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!r) {
|
|
dev_err(&pdev->dev, "no iomem resource\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->rng.name = pdev->name;
|
|
priv->rng.init = bcm63xx_rng_init;
|
|
priv->rng.cleanup = bcm63xx_rng_cleanup;
|
|
priv->rng.data_present = bcm63xx_rng_data_present;
|
|
priv->rng.data_read = bcm63xx_rng_data_read;
|
|
|
|
priv->clk = devm_clk_get(&pdev->dev, "ipsec");
|
|
if (IS_ERR(priv->clk)) {
|
|
ret = PTR_ERR(priv->clk);
|
|
dev_err(&pdev->dev, "no clock for device: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (!devm_request_mem_region(&pdev->dev, r->start,
|
|
resource_size(r), pdev->name)) {
|
|
dev_err(&pdev->dev, "request mem failed");
|
|
return -EBUSY;
|
|
}
|
|
|
|
priv->regs = devm_ioremap_nocache(&pdev->dev, r->start,
|
|
resource_size(r));
|
|
if (!priv->regs) {
|
|
dev_err(&pdev->dev, "ioremap failed");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = devm_hwrng_register(&pdev->dev, &priv->rng);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register rng device: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
dev_info(&pdev->dev, "registered RNG driver\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id bcm63xx_rng_of_match[] = {
|
|
{ .compatible = "brcm,bcm6368-rng", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bcm63xx_rng_of_match);
|
|
#endif
|
|
|
|
static struct platform_driver bcm63xx_rng_driver = {
|
|
.probe = bcm63xx_rng_probe,
|
|
.driver = {
|
|
.name = "bcm63xx-rng",
|
|
.of_match_table = of_match_ptr(bcm63xx_rng_of_match),
|
|
},
|
|
};
|
|
|
|
module_platform_driver(bcm63xx_rng_driver);
|
|
|
|
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
|
|
MODULE_DESCRIPTION("Broadcom BCM63xx RNG driver");
|
|
MODULE_LICENSE("GPL");
|