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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

Documentation/devicetree/bindings/crypto/samsung,exynos-rng4.txt

+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.

drivers/crypto/exynos-rng.c

+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,

	},

	{ },

};