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    Subject[PATCH 1/3] crypto: exynos - Support Exynos5250+ SoCs
    Date
    Add support for PRNG in Exynos5250+ SoCs.

    Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
    ---
    .../bindings/crypto/samsung,exynos-rng4.txt | 4 ++-
    drivers/crypto/exynos-rng.c | 36 ++++++++++++++++++++--
    2 files changed, 36 insertions(+), 4 deletions(-)

    diff --git a/Documentation/devicetree/bindings/crypto/samsung,exynos-rng4.txt b/Documentation/devicetree/bindings/crypto/samsung,exynos-rng4.txt
    index 4ca8dd4d7e66..a13fbdb4bd88 100644
    --- a/Documentation/devicetree/bindings/crypto/samsung,exynos-rng4.txt
    +++ b/Documentation/devicetree/bindings/crypto/samsung,exynos-rng4.txt
    @@ -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.
    diff --git a/drivers/crypto/exynos-rng.c b/drivers/crypto/exynos-rng.c
    index 451620b475a0..894ef93ef5ec 100644
    --- a/drivers/crypto/exynos-rng.c
    +++ b/drivers/crypto/exynos-rng.c
    @@ -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 0x02
    +
    #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 +48,11 @@
    #define EXYNOS_RNG_SEED_REGS 5
    #define EXYNOS_RNG_SEED_SIZE (EXYNOS_RNG_SEED_REGS * 4)

    +enum exynos_prng_type {
    + EXYNOS_PRNG_TYPE4 = 4,
    + EXYNOS_PRNG_TYPE5 = 5,
    +};
    +
    /*
    * Driver re-seeds itself with generated random numbers to increase
    * the randomness.
    @@ -63,6 +73,7 @@ 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 +171,13 @@ 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_TYPE4) {
    + exynos_rng_writel(rng, EXYNOS_RNG_CONTROL_START,
    + EXYNOS_RNG_CONTROL);
    + } else if (rng->type == EXYNOS_PRNG_TYPE5) {
    + 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 +295,13 @@ 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);
    + if (rng->type != EXYNOS_PRNG_TYPE4 &&
    + rng->type != EXYNOS_PRNG_TYPE5) {
    + dev_err(&pdev->dev, "Unsupported PRNG type: %d", rng->type);
    + return -ENOTSUPP;
    + }
    +
    rng->dev = &pdev->dev;
    rng->clk = devm_clk_get(&pdev->dev, "secss");
    if (IS_ERR(rng->clk)) {
    @@ -300,7 +323,10 @@ static int exynos_rng_probe(struct platform_device *pdev)
    dev_err(&pdev->dev,
    "Couldn't register rng crypto alg: %d\n", ret);
    exynos_rng_dev = NULL;
    - }
    + } else
    + dev_info(&pdev->dev,
    + "Exynos Pseudo Random Number Generator (type:%d)\n",
    + rng->type);

    return ret;
    }
    @@ -367,6 +393,10 @@ 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_TYPE4,
    + }, {
    + .compatible = "samsung,exynos5250-prng",
    + .data = (const void *)EXYNOS_PRNG_TYPE5,
    },
    { },
    };
    --
    2.11.0
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