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Commit f76d38b2 authored by Łukasz Stelmach's avatar Łukasz Stelmach Committed by Herbert Xu
Browse files

crypto: exynos - Support Exynos5250+ SoCs



Add support for PRNG in Exynos5250+ SoCs.

Signed-off-by: default avatarŁukasz Stelmach <l.stelmach@samsung.com>
Reviewed-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 6d6e71fe
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+3 −1
Original line number Diff line number Diff line
@@ -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.
+25 −2
Original line number Diff line number Diff line
@@ -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;

	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,
	},
	{ },
};