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hwrng: omap - Add device variant for SafeXcel IP-76 found in Armada 8K

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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 <romain.perier@free-electrons.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Romain Perier 2016-09-16 12:08:55 +02:00 committed by Herbert Xu
parent f0d5a11200
commit 383212425c
2 changed files with 85 additions and 3 deletions
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2
drivers/char/hw_random/Kconfig
View File

@ -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

86
drivers/char/hw_random/omap-rng.c
View File

@ -28,6 +28,7 @@
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <asm/io.h>
@ -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;
}