From: Romain Perier Date: Fri, 16 Sep 2016 10:08:55 +0000 (+0200) Subject: hwrng: omap - Add device variant for SafeXcel IP-76 found in Armada 8K X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=383212425c926f3648fd760b2b674f1b7fac0d1d;p=linux-beck.git hwrng: omap - Add device variant for SafeXcel IP-76 found in Armada 8K This commits adds a device variant for Safexcel,EIP76 found in Marvell Armada 8k. It defines registers mapping with the good offset and add a specific initialization function. Signed-off-by: Romain Perier Signed-off-by: Herbert Xu --- diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 200dab5136a7..ceff2fc524b1 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -168,7 +168,7 @@ config HW_RANDOM_IXP4XX config HW_RANDOM_OMAP tristate "OMAP Random Number Generator support" - depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS + depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS || ARCH_MVEBU default HW_RANDOM ---help--- This driver provides kernel-side support for the Random Number diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c index c64a0990feb7..3ad86fdf954e 100644 --- a/drivers/char/hw_random/omap-rng.c +++ b/drivers/char/hw_random/omap-rng.c @@ -28,6 +28,7 @@ #include #include #include +#include #include @@ -63,6 +64,7 @@ #define OMAP2_RNG_OUTPUT_SIZE 0x4 #define OMAP4_RNG_OUTPUT_SIZE 0x8 +#define EIP76_RNG_OUTPUT_SIZE 0x10 enum { RNG_OUTPUT_0_REG = 0, @@ -108,6 +110,23 @@ static const u16 reg_map_omap4[] = { [RNG_SYSCONFIG_REG] = 0x1FE4, }; +static const u16 reg_map_eip76[] = { + [RNG_OUTPUT_0_REG] = 0x0, + [RNG_OUTPUT_1_REG] = 0x4, + [RNG_OUTPUT_2_REG] = 0x8, + [RNG_OUTPUT_3_REG] = 0xc, + [RNG_STATUS_REG] = 0x10, + [RNG_INTACK_REG] = 0x10, + [RNG_CONTROL_REG] = 0x14, + [RNG_CONFIG_REG] = 0x18, + [RNG_ALARMCNT_REG] = 0x1c, + [RNG_FROENABLE_REG] = 0x20, + [RNG_FRODETUNE_REG] = 0x24, + [RNG_ALARMMASK_REG] = 0x28, + [RNG_ALARMSTOP_REG] = 0x2c, + [RNG_REV_REG] = 0x7c, +}; + struct omap_rng_dev; /** * struct omap_rng_pdata - RNG IP block-specific data @@ -130,6 +149,7 @@ struct omap_rng_dev { struct device *dev; const struct omap_rng_pdata *pdata; struct hwrng rng; + struct clk *clk; }; static inline u32 omap_rng_read(struct omap_rng_dev *priv, u16 reg) @@ -221,6 +241,38 @@ static inline u32 omap4_rng_data_present(struct omap_rng_dev *priv) return omap_rng_read(priv, RNG_STATUS_REG) & RNG_REG_STATUS_RDY; } +static int eip76_rng_init(struct omap_rng_dev *priv) +{ + u32 val; + + /* Return if RNG is already running. */ + if (omap_rng_read(priv, RNG_CONTROL_REG) & RNG_CONTROL_ENABLE_TRNG_MASK) + return 0; + + /* Number of 512 bit blocks of raw Noise Source output data that must + * be processed by either the Conditioning Function or the + * SP 800-90 DRBG ‘BC_DF’ functionality to yield a ‘full entropy’ + * output value. + */ + val = 0x5 << RNG_CONFIG_MIN_REFIL_CYCLES_SHIFT; + + /* Number of FRO samples that are XOR-ed together into one bit to be + * shifted into the main shift register + */ + val |= RNG_CONFIG_MAX_REFIL_CYCLES << RNG_CONFIG_MAX_REFIL_CYCLES_SHIFT; + omap_rng_write(priv, RNG_CONFIG_REG, val); + + /* Enable all available FROs */ + omap_rng_write(priv, RNG_FRODETUNE_REG, 0x0); + omap_rng_write(priv, RNG_FROENABLE_REG, RNG_REG_FROENABLE_MASK); + + /* Enable TRNG */ + val = RNG_CONTROL_ENABLE_TRNG_MASK; + omap_rng_write(priv, RNG_CONTROL_REG, val); + + return 0; +} + static int omap4_rng_init(struct omap_rng_dev *priv) { u32 val; @@ -290,6 +342,14 @@ static struct omap_rng_pdata omap4_rng_pdata = { .cleanup = omap4_rng_cleanup, }; +static struct omap_rng_pdata eip76_rng_pdata = { + .regs = (u16 *)reg_map_eip76, + .data_size = EIP76_RNG_OUTPUT_SIZE, + .data_present = omap4_rng_data_present, + .init = eip76_rng_init, + .cleanup = omap4_rng_cleanup, +}; + static const struct of_device_id omap_rng_of_match[] = { { .compatible = "ti,omap2-rng", @@ -299,6 +359,10 @@ static const struct of_device_id omap_rng_of_match[] = { .compatible = "ti,omap4-rng", .data = &omap4_rng_pdata, }, + { + .compatible = "inside-secure,safexcel-eip76", + .data = &eip76_rng_pdata, + }, {}, }; MODULE_DEVICE_TABLE(of, omap_rng_of_match); @@ -317,7 +381,8 @@ static int of_get_omap_rng_device_details(struct omap_rng_dev *priv, } priv->pdata = match->data; - if (of_device_is_compatible(dev->of_node, "ti,omap4-rng")) { + if (of_device_is_compatible(dev->of_node, "ti,omap4-rng") || + of_device_is_compatible(dev->of_node, "inside-secure,safexcel-eip76")) { irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(dev, "%s: error getting IRQ resource - %d\n", @@ -333,6 +398,16 @@ static int of_get_omap_rng_device_details(struct omap_rng_dev *priv, return err; } omap_rng_write(priv, RNG_INTMASK_REG, RNG_SHUTDOWN_OFLO_MASK); + + priv->clk = of_clk_get(pdev->dev.of_node, 0); + if (IS_ERR(priv->clk) && PTR_ERR(priv->clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (!IS_ERR(priv->clk)) { + err = clk_prepare_enable(priv->clk); + if (err) + dev_err(&pdev->dev, "unable to enable the clk, " + "err = %d\n", err); + } } return 0; } @@ -394,7 +469,7 @@ static int omap_rng_probe(struct platform_device *pdev) ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) : get_omap_rng_device_details(priv); if (ret) - goto err_ioremap; + goto err_register; ret = hwrng_register(&priv->rng); if (ret) @@ -407,7 +482,11 @@ static int omap_rng_probe(struct platform_device *pdev) err_register: priv->base = NULL; + pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); + + if (!IS_ERR(priv->clk)) + clk_disable_unprepare(priv->clk); err_ioremap: dev_err(dev, "initialization failed.\n"); return ret; @@ -424,6 +503,9 @@ static int omap_rng_remove(struct platform_device *pdev) pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); + if (!IS_ERR(priv->clk)) + clk_disable_unprepare(priv->clk); + return 0; }