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crypto: exynos - Support Exynos5250+ SoCs

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Add support for PRNG in Exynos5250+ SoCs.

Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Łukasz Stelmach 2017-12-12 17:36:04 +01:00 committed by Herbert Xu
parent 6d6e71feb1
commit f76d38b26c
2 changed files with 28 additions and 3 deletions
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4
Documentation/devicetree/bindings/crypto/samsung,exynos-rng4.txt
View File

@ -2,7 +2,9 @@ Exynos Pseudo Random Number Generator
Required properties:
- compatible : Should be "samsung,exynos4-rng".
- compatible : One of:
- "samsung,exynos4-rng" for Exynos4210 and Exynos4412
- "samsung,exynos5250-prng" for Exynos5250+
- reg : Specifies base physical address and size of the registers map.
- clocks : Phandle to clock-controller plus clock-specifier pair.
- clock-names : "secss" as a clock name.

27
drivers/crypto/exynos-rng.c
View File

@ -22,12 +22,17 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <crypto/internal/rng.h>
#define EXYNOS_RNG_CONTROL 0x0
#define EXYNOS_RNG_STATUS 0x10
#define EXYNOS_RNG_SEED_CONF 0x14
#define EXYNOS_RNG_GEN_PRNG BIT(1)
#define EXYNOS_RNG_SEED_BASE 0x140
#define EXYNOS_RNG_SEED(n) (EXYNOS_RNG_SEED_BASE + (n * 0x4))
#define EXYNOS_RNG_OUT_BASE 0x160
@ -43,6 +48,12 @@
#define EXYNOS_RNG_SEED_REGS 5
#define EXYNOS_RNG_SEED_SIZE (EXYNOS_RNG_SEED_REGS * 4)
enum exynos_prng_type {
EXYNOS_PRNG_UNKNOWN = 0,
EXYNOS_PRNG_EXYNOS4,
EXYNOS_PRNG_EXYNOS5,
};
/*
* Driver re-seeds itself with generated random numbers to increase
* the randomness.
@ -63,6 +74,7 @@ struct exynos_rng_ctx {
/* Device associated memory */
struct exynos_rng_dev {
struct device *dev;
enum exynos_prng_type type;
void __iomem *mem;
struct clk *clk;
/* Generated numbers stored for seeding during resume */
@ -160,8 +172,13 @@ static int exynos_rng_get_random(struct exynos_rng_dev *rng,
{
int retry = EXYNOS_RNG_WAIT_RETRIES;
exynos_rng_writel(rng, EXYNOS_RNG_CONTROL_START,
EXYNOS_RNG_CONTROL);
if (rng->type == EXYNOS_PRNG_EXYNOS4) {
exynos_rng_writel(rng, EXYNOS_RNG_CONTROL_START,
EXYNOS_RNG_CONTROL);
} else if (rng->type == EXYNOS_PRNG_EXYNOS5) {
exynos_rng_writel(rng, EXYNOS_RNG_GEN_PRNG,
EXYNOS_RNG_SEED_CONF);
}
while (!(exynos_rng_readl(rng,
EXYNOS_RNG_STATUS) & EXYNOS_RNG_STATUS_RNG_DONE) && --retry)
@ -279,6 +296,8 @@ static int exynos_rng_probe(struct platform_device *pdev)
if (!rng)
return -ENOMEM;
rng->type = (enum exynos_prng_type)of_device_get_match_data(&pdev->dev);
rng->dev = &pdev->dev;
rng->clk = devm_clk_get(&pdev->dev, "secss");
if (IS_ERR(rng->clk)) {
@ -367,6 +386,10 @@ static SIMPLE_DEV_PM_OPS(exynos_rng_pm_ops, exynos_rng_suspend,
static const struct of_device_id exynos_rng_dt_match[] = {
{
.compatible = "samsung,exynos4-rng",
.data = (const void *)EXYNOS_PRNG_EXYNOS4,
}, {
.compatible = "samsung,exynos5250-prng",
.data = (const void *)EXYNOS_PRNG_EXYNOS5,
},
{ },
};