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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

Browse source 
Pull crypto updates from Herbert Xu:
 "Here is the crypto update for 4.9:

  API:
   - The crypto engine code now supports hashes.

  Algorithms:
   - Allow keys >= 2048 bits in FIPS mode for RSA.

  Drivers:
   - Memory overwrite fix for vmx ghash.
   - Add support for building ARM sha1-neon in Thumb2 mode.
   - Reenable ARM ghash-ce code by adding import/export.
   - Reenable img-hash by adding import/export.
   - Add support for multiple cores in omap-aes.
   - Add little-endian support for sha1-powerpc.
   - Add Cavium HWRNG driver for ThunderX SoC"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (137 commits)
  crypto: caam - treat SGT address pointer as u64
  crypto: ccp - Make syslog errors human-readable
  crypto: ccp - clean up data structure
  crypto: vmx - Ensure ghash-generic is enabled
  crypto: testmgr - add guard to dst buffer for ahash_export
  crypto: caam - Unmap region obtained by of_iomap
  crypto: sha1-powerpc - little-endian support
  crypto: gcm - Fix IV buffer size in crypto_gcm_setkey
  crypto: vmx - Fix memory corruption caused by p8_ghash
  crypto: ghash-generic - move common definitions to a new header file
  crypto: caam - fix sg dump
  hwrng: omap - Only fail if pm_runtime_get_sync returns < 0
  crypto: omap-sham - shrink the internal buffer size
  crypto: omap-sham - add support for export/import
  crypto: omap-sham - convert driver logic to use sgs for data xmit
  crypto: omap-sham - change the DMA threshold value to a define
  crypto: omap-sham - add support functions for sg based data handling
  crypto: omap-sham - rename sgl to sgl_tmp for deprecation
  crypto: omap-sham - align algorithms on word offset
  crypto: omap-sham - add context export/import stubs
  ...
This commit is contained in:
Linus Torvalds 2016-10-10 14:04:16 -07:00
commit 30066ce675
77 changed files with 3852 additions and 1654 deletions
Download patch file Download diff file Expand all files Collapse all files

13
drivers/char/hw_random/Kconfig
View file

@ -410,6 +410,19 @@ config HW_RANDOM_MESON
If unsure, say Y.
config HW_RANDOM_CAVIUM
tristate "Cavium ThunderX Random Number Generator support"
depends on HW_RANDOM && PCI && (ARM64 || (COMPILE_TEST && 64BIT))
default HW_RANDOM
---help---
This driver provides kernel-side support for the Random Number
Generator hardware found on Cavium SoCs.
To compile this driver as a module, choose M here: the
module will be called cavium_rng.
If unsure, say Y.
endif # HW_RANDOM
config UML_RANDOM

1
drivers/char/hw_random/Makefile
View file

@ -35,3 +35,4 @@ obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o
obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o
obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o
obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o
obj-$(CONFIG_HW_RANDOM_CAVIUM) += cavium-rng.o cavium-rng-vf.o

142
drivers/char/hw_random/amd-rng.c
View file

@ -24,16 +24,18 @@
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/hw_random.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <linux/hw_random.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#define DRV_NAME "AMD768-HWRNG"
#define PFX KBUILD_MODNAME ": "
#define RNGDATA 0x00
#define RNGDONE 0x04
#define PMBASE_OFFSET 0xF0
#define PMBASE_SIZE 8
/*
* Data for PCI driver interface
@ -50,72 +52,84 @@ static const struct pci_device_id pci_tbl[] = {
};
MODULE_DEVICE_TABLE(pci, pci_tbl);
static struct pci_dev *amd_pdev;
struct amd768_priv {
void __iomem *iobase;
struct pci_dev *pcidev;
};
static int amd_rng_data_present(struct hwrng *rng, int wait)
static int amd_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
{
u32 pmbase = (u32)rng->priv;
int data, i;
u32 *data = buf;
struct amd768_priv *priv = (struct amd768_priv *)rng->priv;
size_t read = 0;
/* We will wait at maximum one time per read */
int timeout = max / 4 + 1;
for (i = 0; i < 20; i++) {
data = !!(inl(pmbase + 0xF4) & 1);
if (data || !wait)
break;
udelay(10);
/*
* RNG data is available when RNGDONE is set to 1
* New random numbers are generated approximately 128 microseconds
* after RNGDATA is read
*/
while (read < max) {
if (ioread32(priv->iobase + RNGDONE) == 0) {
if (wait) {
/* Delay given by datasheet */
usleep_range(128, 196);
if (timeout-- == 0)
return read;
} else {
return 0;
}
} else {
*data = ioread32(priv->iobase + RNGDATA);
data++;
read += 4;
}
}
return data;
}
static int amd_rng_data_read(struct hwrng *rng, u32 *data)
{
u32 pmbase = (u32)rng->priv;
*data = inl(pmbase + 0xF0);
return 4;
return read;
}
static int amd_rng_init(struct hwrng *rng)
{
struct amd768_priv *priv = (struct amd768_priv *)rng->priv;
u8 rnen;
pci_read_config_byte(amd_pdev, 0x40, &rnen);
rnen |= (1 << 7); /* RNG on */
pci_write_config_byte(amd_pdev, 0x40, rnen);
pci_read_config_byte(priv->pcidev, 0x40, &rnen);
rnen |= BIT(7); /* RNG on */
pci_write_config_byte(priv->pcidev, 0x40, rnen);
pci_read_config_byte(amd_pdev, 0x41, &rnen);
rnen |= (1 << 7); /* PMIO enable */
pci_write_config_byte(amd_pdev, 0x41, rnen);
pci_read_config_byte(priv->pcidev, 0x41, &rnen);
rnen |= BIT(7); /* PMIO enable */
pci_write_config_byte(priv->pcidev, 0x41, rnen);
return 0;
}
static void amd_rng_cleanup(struct hwrng *rng)
{
struct amd768_priv *priv = (struct amd768_priv *)rng->priv;
u8 rnen;
pci_read_config_byte(amd_pdev, 0x40, &rnen);
rnen &= ~(1 << 7); /* RNG off */
pci_write_config_byte(amd_pdev, 0x40, rnen);
pci_read_config_byte(priv->pcidev, 0x40, &rnen);
rnen &= ~BIT(7); /* RNG off */
pci_write_config_byte(priv->pcidev, 0x40, rnen);
}
static struct hwrng amd_rng = {
.name = "amd",
.init = amd_rng_init,
.cleanup = amd_rng_cleanup,
.data_present = amd_rng_data_present,
.data_read = amd_rng_data_read,
.read = amd_rng_read,
};
static int __init mod_init(void)
{
int err = -ENODEV;
struct pci_dev *pdev = NULL;
const struct pci_device_id *ent;
u32 pmbase;
struct amd768_priv *priv;
for_each_pci_dev(pdev) {
ent = pci_match_id(pci_tbl, pdev);
@ -123,42 +137,44 @@ static int __init mod_init(void)
goto found;
}
/* Device not found. */
goto out;
return -ENODEV;
found:
err = pci_read_config_dword(pdev, 0x58, &pmbase);
if (err)
goto out;
err = -EIO;
return err;
pmbase &= 0x0000FF00;
if (pmbase == 0)
goto out;
if (!request_region(pmbase + 0xF0, 8, "AMD HWRNG")) {
dev_err(&pdev->dev, "AMD HWRNG region 0x%x already in use!\n",
pmbase + 0xF0);
err = -EBUSY;
goto out;
}
amd_rng.priv = (unsigned long)pmbase;
amd_pdev = pdev;
return -EIO;
pr_info("AMD768 RNG detected\n");
err = hwrng_register(&amd_rng);
if (err) {
pr_err(PFX "RNG registering failed (%d)\n",
err);
release_region(pmbase + 0xF0, 8);
goto out;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (!devm_request_region(&pdev->dev, pmbase + PMBASE_OFFSET,
PMBASE_SIZE, DRV_NAME)) {
dev_err(&pdev->dev, DRV_NAME " region 0x%x already in use!\n",
pmbase + 0xF0);
return -EBUSY;
}
out:
return err;
priv->iobase = devm_ioport_map(&pdev->dev, pmbase + PMBASE_OFFSET,
PMBASE_SIZE);
if (!priv->iobase) {
pr_err(DRV_NAME "Cannot map ioport\n");
return -ENOMEM;
}
amd_rng.priv = (unsigned long)priv;
priv->pcidev = pdev;
pr_info(DRV_NAME " detected\n");
return devm_hwrng_register(&pdev->dev, &amd_rng);
}
static void __exit mod_exit(void)
{
u32 pmbase = (unsigned long)amd_rng.priv;
release_region(pmbase + 0xF0, 8);
hwrng_unregister(&amd_rng);
}
module_init(mod_init);

5
drivers/char/hw_random/bcm2835-rng.c
View file

@ -92,9 +92,10 @@ static int bcm2835_rng_probe(struct platform_device *pdev)
bcm2835_rng_ops.priv = (unsigned long)rng_base;
rng_id = of_match_node(bcm2835_rng_of_match, np);
if (!rng_id)
if (!rng_id) {
iounmap(rng_base);
return -EINVAL;
}
/* Check for rng init function, execute it */
rng_setup = rng_id->data;
if (rng_setup)

99
drivers/char/hw_random/cavium-rng-vf.c Normal file
View file

@ -0,0 +1,99 @@
/*
* Hardware Random Number Generator support for Cavium, Inc.
* Thunder processor family.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2016 Cavium, Inc.
*/
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
struct cavium_rng {
struct hwrng ops;
void __iomem *result;
};
/* Read data from the RNG unit */
static int cavium_rng_read(struct hwrng *rng, void *dat, size_t max, bool wait)
{
struct cavium_rng *p = container_of(rng, struct cavium_rng, ops);
unsigned int size = max;
while (size >= 8) {
*((u64 *)dat) = readq(p->result);
size -= 8;
dat += 8;
}
while (size > 0) {
*((u8 *)dat) = readb(p->result);
size--;
dat++;
}
return max;
}
/* Map Cavium RNG to an HWRNG object */
static int cavium_rng_probe_vf(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct cavium_rng *rng;
int ret;
rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
if (!rng)
return -ENOMEM;
/* Map the RNG result */
rng->result = pcim_iomap(pdev, 0, 0);
if (!rng->result) {
dev_err(&pdev->dev, "Error iomap failed retrieving result.\n");
return -ENOMEM;
}
rng->ops.name = "cavium rng";
rng->ops.read = cavium_rng_read;
rng->ops.quality = 1000;
pci_set_drvdata(pdev, rng);
ret = hwrng_register(&rng->ops);
if (ret) {
dev_err(&pdev->dev, "Error registering device as HWRNG.\n");
return ret;
}
return 0;
}
/* Remove the VF */
void cavium_rng_remove_vf(struct pci_dev *pdev)
{
struct cavium_rng *rng;
rng = pci_get_drvdata(pdev);
hwrng_unregister(&rng->ops);
}
static const struct pci_device_id cavium_rng_vf_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa033), 0, 0, 0},
{0,},
};
MODULE_DEVICE_TABLE(pci, cavium_rng_vf_id_table);
static struct pci_driver cavium_rng_vf_driver = {
.name = "cavium_rng_vf",
.id_table = cavium_rng_vf_id_table,
.probe = cavium_rng_probe_vf,
.remove = cavium_rng_remove_vf,
};
module_pci_driver(cavium_rng_vf_driver);
MODULE_AUTHOR("Omer Khaliq <[email protected]>");
MODULE_LICENSE("GPL");

94
drivers/char/hw_random/cavium-rng.c Normal file
View file

@ -0,0 +1,94 @@
/*
* Hardware Random Number Generator support for Cavium Inc.
* Thunder processor family.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2016 Cavium, Inc.
*/
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#define THUNDERX_RNM_ENT_EN 0x1
#define THUNDERX_RNM_RNG_EN 0x2
struct cavium_rng_pf {
void __iomem *control_status;
};
/* Enable the RNG hardware and activate the VF */
static int cavium_rng_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct cavium_rng_pf *rng;
int iov_err;
rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);
if (!rng)
return -ENOMEM;
/*Map the RNG control */
rng->control_status = pcim_iomap(pdev, 0, 0);
if (!rng->control_status) {
dev_err(&pdev->dev,
"Error iomap failed retrieving control_status.\n");
return -ENOMEM;
}
/* Enable the RNG hardware and entropy source */
writeq(THUNDERX_RNM_RNG_EN | THUNDERX_RNM_ENT_EN,
rng->control_status);
pci_set_drvdata(pdev, rng);
/* Enable the Cavium RNG as a VF */
iov_err = pci_enable_sriov(pdev, 1);
if (iov_err != 0) {
/* Disable the RNG hardware and entropy source */
writeq(0, rng->control_status);
dev_err(&pdev->dev,
"Error initializing RNG virtual function,(%i).\n",
iov_err);
return iov_err;
}
return 0;
}
/* Disable VF and RNG Hardware */
void cavium_rng_remove(struct pci_dev *pdev)
{
struct cavium_rng_pf *rng;
rng = pci_get_drvdata(pdev);
/* Remove the VF */
pci_disable_sriov(pdev);
/* Disable the RNG hardware and entropy source */
writeq(0, rng->control_status);
}
static const struct pci_device_id cavium_rng_pf_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xa018), 0, 0, 0}, /* Thunder RNM */
{0,},
};
MODULE_DEVICE_TABLE(pci, cavium_rng_pf_id_table);
static struct pci_driver cavium_rng_pf_driver = {
.name = "cavium_rng_pf",
.id_table = cavium_rng_pf_id_table,
.probe = cavium_rng_probe,
.remove = cavium_rng_remove,
};
module_pci_driver(cavium_rng_pf_driver);
MODULE_AUTHOR("Omer Khaliq <[email protected]>");
MODULE_LICENSE("GPL");

37
drivers/char/hw_random/core.c
View file

@ -449,22 +449,6 @@ int hwrng_register(struct hwrng *rng)
goto out;
mutex_lock(&rng_mutex);
/* kmalloc makes this safe for virt_to_page() in virtio_rng.c */
err = -ENOMEM;
if (!rng_buffer) {
rng_buffer = kmalloc(rng_buffer_size(), GFP_KERNEL);
if (!rng_buffer)
goto out_unlock;
}
if (!rng_fillbuf) {
rng_fillbuf = kmalloc(rng_buffer_size(), GFP_KERNEL);
if (!rng_fillbuf) {
kfree(rng_buffer);
goto out_unlock;
}
}
/* Must not register two RNGs with the same name. */
err = -EEXIST;
list_for_each_entry(tmp, &rng_list, list) {
@ -573,7 +557,26 @@ EXPORT_SYMBOL_GPL(devm_hwrng_unregister);
static int __init hwrng_modinit(void)
{
return register_miscdev();
int ret = -ENOMEM;
/* kmalloc makes this safe for virt_to_page() in virtio_rng.c */
rng_buffer = kmalloc(rng_buffer_size(), GFP_KERNEL);
if (!rng_buffer)
return -ENOMEM;
rng_fillbuf = kmalloc(rng_buffer_size(), GFP_KERNEL);
if (!rng_fillbuf) {
kfree(rng_buffer);
return -ENOMEM;
}
ret = register_miscdev();
if (ret) {
kfree(rng_fillbuf);
kfree(rng_buffer);
}
return ret;
}
static void __exit hwrng_modexit(void)

60
drivers/char/hw_random/geode-rng.c
View file

@ -24,15 +24,12 @@
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/hw_random.h>
#include <linux/delay.h>
#include <asm/io.h>
#define PFX KBUILD_MODNAME ": "
#include <linux/hw_random.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#define GEODE_RNG_DATA_REG 0x50
#define GEODE_RNG_STATUS_REG 0x54
@ -85,7 +82,6 @@ static struct hwrng geode_rng = {
static int __init mod_init(void)
{
int err = -ENODEV;
struct pci_dev *pdev = NULL;
const struct pci_device_id *ent;
void __iomem *mem;
@ -93,43 +89,27 @@ static int __init mod_init(void)
for_each_pci_dev(pdev) {
ent = pci_match_id(pci_tbl, pdev);
if (ent)
goto found;
if (ent) {
rng_base = pci_resource_start(pdev, 0);
if (rng_base == 0)
return -ENODEV;
mem = devm_ioremap(&pdev->dev, rng_base, 0x58);
if (!mem)
return -ENOMEM;
geode_rng.priv = (unsigned long)mem;
pr_info("AMD Geode RNG detected\n");
return devm_hwrng_register(&pdev->dev, &geode_rng);
}
}
/* Device not found. */
goto out;
found:
rng_base = pci_resource_start(pdev, 0);
if (rng_base == 0)
goto out;
err = -ENOMEM;
mem = ioremap(rng_base, 0x58);
if (!mem)
goto out;
geode_rng.priv = (unsigned long)mem;
pr_info("AMD Geode RNG detected\n");
err = hwrng_register(&geode_rng);
if (err) {
pr_err(PFX "RNG registering failed (%d)\n",
err);
goto err_unmap;
}
out:
return err;
err_unmap:
iounmap(mem);
goto out;
return -ENODEV;
}
static void __exit mod_exit(void)
{
void __iomem *mem = (void __iomem *)geode_rng.priv;
hwrng_unregister(&geode_rng);
iounmap(mem);
}
module_init(mod_init);

3
drivers/char/hw_random/meson-rng.c
View file

@ -76,9 +76,6 @@ static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
struct meson_rng_data *data =
container_of(rng, struct meson_rng_data, rng);
if (max < sizeof(u32))
return 0;
*(u32 *)buf = readl_relaxed(data->base + RNG_DATA);
return sizeof(u32);

4
drivers/char/hw_random/omap-rng.c
View file

@ -385,7 +385,7 @@ static int omap_rng_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
if (ret) {
if (ret < 0) {
dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret);
pm_runtime_put_noidle(&pdev->dev);
goto err_ioremap;
@ -443,7 +443,7 @@ static int __maybe_unused omap_rng_resume(struct device *dev)
int ret;
ret = pm_runtime_get_sync(dev);
if (ret) {
if (ret < 0) {
dev_err(dev, "Failed to runtime_get device: %d\n", ret);
pm_runtime_put_noidle(dev);
return ret;

10
drivers/char/hw_random/omap3-rom-rng.c
View file

@ -71,12 +71,7 @@ static int omap3_rom_rng_get_random(void *buf, unsigned int count)
return 0;
}
static int omap3_rom_rng_data_present(struct hwrng *rng, int wait)
{
return 1;
}
static int omap3_rom_rng_data_read(struct hwrng *rng, u32 *data)
static int omap3_rom_rng_read(struct hwrng *rng, void *data, size_t max, bool w)
{
int r;
@ -88,8 +83,7 @@ static int omap3_rom_rng_data_read(struct hwrng *rng, u32 *data)
static struct hwrng omap3_rom_rng_ops = {
.name = "omap3-rom",
.data_present = omap3_rom_rng_data_present,
.data_read = omap3_rom_rng_data_read,
.read = omap3_rom_rng_read,
};
static int omap3_rom_rng_probe(struct platform_device *pdev)

37
drivers/char/hw_random/pasemi-rng.c
View file

@ -95,42 +95,20 @@ static struct hwrng pasemi_rng = {
.data_read = pasemi_rng_data_read,
};
static int rng_probe(struct platform_device *ofdev)
static int rng_probe(struct platform_device *pdev)
{
void __iomem *rng_regs;
struct device_node *rng_np = ofdev->dev.of_node;
struct resource res;
int err = 0;
struct resource *res;
err = of_address_to_resource(rng_np, 0, &res);
if (err)
return -ENODEV;
rng_regs = ioremap(res.start, 0x100);
if (!rng_regs)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rng_regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(rng_regs))
return PTR_ERR(rng_regs);
pasemi_rng.priv = (unsigned long)rng_regs;
pr_info("Registering PA Semi RNG\n");
err = hwrng_register(&pasemi_rng);
if (err)
iounmap(rng_regs);
return err;
}
static int rng_remove(struct platform_device *dev)
{
void __iomem *rng_regs = (void __iomem *)pasemi_rng.priv;
hwrng_unregister(&pasemi_rng);
iounmap(rng_regs);
return 0;
return devm_hwrng_register(&pdev->dev, &pasemi_rng);
}
static const struct of_device_id rng_match[] = {
@ -146,7 +124,6 @@ static struct platform_driver rng_driver = {
.of_match_table = rng_match,
},
.probe = rng_probe,
.remove = rng_remove,
};
module_platform_driver(rng_driver);

1
drivers/char/hw_random/pic32-rng.c
View file

@ -143,7 +143,6 @@ static struct platform_driver pic32_rng_driver = {
.remove = pic32_rng_remove,
.driver = {
.name = "pic32-rng",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(pic32_rng_of_match),
},
};

4
drivers/char/hw_random/st-rng.c
View file

@ -54,9 +54,6 @@ static int st_rng_read(struct hwrng *rng, void *data, size_t max, bool wait)
u32 status;
int i;
if (max < sizeof(u16))
return -EINVAL;
/* Wait until FIFO is full - max 4uS*/
for (i = 0; i < ST_RNG_FILL_FIFO_TIMEOUT; i++) {
status = readl_relaxed(ddata->base + ST_RNG_STATUS_REG);
@ -111,6 +108,7 @@ static int st_rng_probe(struct platform_device *pdev)
ret = hwrng_register(&ddata->ops);
if (ret) {
dev_err(&pdev->dev, "Failed to register HW RNG\n");
clk_disable_unprepare(clk);
return ret;
}

11
drivers/char/hw_random/tx4939-rng.c
View file

@ -144,22 +144,13 @@ static int __init tx4939_rng_probe(struct platform_device *dev)
}
platform_set_drvdata(dev, rngdev);
return hwrng_register(&rngdev->rng);
}
static int __exit tx4939_rng_remove(struct platform_device *dev)
{
struct tx4939_rng *rngdev = platform_get_drvdata(dev);
hwrng_unregister(&rngdev->rng);
return 0;
return devm_hwrng_register(&dev->dev, &rngdev->rng);
}
static struct platform_driver tx4939_rng_driver = {
.driver = {
.name = "tx4939-rng",
},
.remove = tx4939_rng_remove,
};
module_platform_driver_probe(tx4939_rng_driver, tx4939_rng_probe);