Commit Graph

29 Commits

Author SHA1 Message Date
Iuliana Prodan
eff9771d51 crypto: caam - use mapped_{src,dst}_nents for descriptor
The mapped_{src,dst}_nents _returned_ from the dma_map_sg
call (which could be less than src/dst_nents) have to be
used to generate the job descriptors.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-10-05 01:06:21 +10:00
Andrey Smirnov
a1cf573ee9 crypto: caam - select DMA address size at runtime
i.MX8 mScale SoC still use 32-bit addresses in its CAAM implmentation,
so we can't rely on sizeof(dma_addr_t) to detemine CAAM pointer
size. Convert the code to query CTPR and MCFGR for that during driver
probing.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Chris Spencer <christopher.spencer@sea.co.uk>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Horia Geantă <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-08-30 18:05:30 +10:00
Iuliana Prodan
58068cfc81 crypto: caam - unregister algorithm only if the registration succeeded
To know if a registration succeeded added a new struct,
caam_akcipher_alg, that keeps, also, the registration status.
This status is updated in caam_pkc_init and verified in
caam_pkc_exit to unregister an algorithm.

Fixes: 1b46c90c8e ("crypto: caam - convert top level drivers to libraries")
Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-08-09 15:11:51 +10:00
Iuliana Prodan
4e3a61c55b crypto: caam - execute module exit point only if necessary
Commit 1b46c90c8e ("crypto: caam - convert top level drivers to libraries")
changed entry and exit points behavior for caamalg,
caamalg_qi, caamalg_qi2, caamhash, caampkc, caamrng.

For example, previously caam_pkc_init() and caam_pkc_exit() were
module entry/exit points. This means that if an error would happen
in caam_pkc_init(), then caam_pkc_exit() wouldn't have been called.
After the mentioned commit, caam_pkc_init() and caam_pkc_exit()
are manually called - from jr.c. caam_pkc_exit() is called
unconditionally, even if caam_pkc_init() failed.

Added a global variable to keep the status of the algorithm
registration and free of resources.
The exit point of caampkc/caamrng module is executed only if the
registration was successful. Therefore we avoid double free of
resources in case the algorithm registration failed.

Fixes: 1b46c90c8e ("crypto: caam - convert top level drivers to libraries")
Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-08-09 15:11:51 +10:00
Horia Geantă
1984aaeec3 crypto: caam - fix return code in completion callbacks
Modify drive to provide a valid errno (and not the HW error ID)
to the user, via completion callbacks.

A "valid errno" is currently not explicitly mentioned in the docs,
however the error code is expected to match the one returned by the
generic SW implementation.

Note: in most error cases caam/qi and caam/qi2 returned -EIO; align all
caam drivers to return -EINVAL.

While here, ratelimit prints triggered by fuzz testing, such that
console is not flooded.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-08-09 15:11:45 +10:00
Fuqian Huang
cc2a58f14f crypto: drivers - Use kmemdup rather than duplicating its implementation
kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-07-26 15:03:59 +10:00
Horia Geantă
059d73eea6 crypto: caam - use len instead of nents for bulding HW S/G table
Currently, conversion of SW S/G table into HW S/G layout relies on
nents returned by sg_nents_for_len(sg, len).
However this leaves the possibility of HW S/G referencing more data
then needed: since buffer length in HW S/G entries is filled using
sg_dma_len(sg), the last entry in HW S/G table might have a length
that is bigger than needed for the crypto request.

This way of S/G table conversion is fine, unless after converting a table
more entries have to be appended to the HW S/G table.
In this case, crypto engine would access data from the S/G entry having
the incorrect length, instead of advancing in the S/G table.
This situation doesn't exist, but the upcoming implementation of
IV update for skcipher algorithms needs to add a S/G entry after
req->dst S/G (corresponding to output IV).

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-06-20 14:18:33 +08:00
Iuliana Prodan
3b2614cb86 crypto: caam - strip input without changing crypto request
For rsa and pkcs1pad, CAAM expects an input of modulus size.
For this we strip the leading zeros in case the size is more than modulus.
This commit avoids modifying the crypto request while stripping zeros from
input, to comply with the crypto API requirement. This is done by adding
a fixup input pointer and length.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geanta <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-06-06 14:38:57 +08:00
Iuliana Prodan
c3725f7ccc crypto: caam - fix pkcs1pad(rsa-caam, sha256) failure because of invalid input
The problem is with the input data size sent to CAAM for encrypt/decrypt.
Pkcs1pad is failing due to pkcs1 padding done in SW starting with0x01
instead of 0x00 0x01.
CAAM expects an input of modulus size. For this we strip the leading
zeros in case the size is more than modulus or pad the input with zeros
until the modulus size is reached.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-06-06 14:38:56 +08:00
Horia Geantă
1b46c90c8e crypto: caam - convert top level drivers to libraries
Currently we allow top level code, i.e. that which sits between the
low level (HW-specific) drivers and crypto API, to be built as several
drivers: caamalg, caamhash, caam_pkc, caamrng, caamalg_qi.

There is no advantage in this, more it interferes with adding support
for deferred probing (there are no corresponding devices and thus
no bus).

Convert these drivers and call init() / exit() manually at the right
time.
Move algorithms initialization at JR probe / remove time:
-the first probed JR registers the crypto algs
-the last removed JR unregisters the crypto algs

Note: caam_qi_init() is called before JR platform devices creation
(of_populate_bus()), such that QI interface is initialized when
the caam/qi algorithms are registered in the JR driver (by calling
caam_qi_algapi_init().

While here, fix the Kconfig entries under CRYPTO_DEV_FSL_CAAM_JR
to be aligned.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-05-23 14:01:03 +08:00
Horia Geantă
a5e5c13398 crypto: caam - fix S/G table passing page boundary
According to CAAM RM:
-crypto engine reads 4 S/G entries (64 bytes) at a time,
even if the S/G table has fewer entries
-it's the responsibility of the user / programmer to make sure
this HW behaviour has no side effect

The drivers do not take care of this currently, leading to IOMMU faults
when the S/G table ends close to a page boundary - since only one page
is DMA mapped, while CAAM's DMA engine accesses two pages.

Fix this by rounding up the number of allocated S/G table entries
to a multiple of 4.
Note that in case of two *contiguous* S/G tables, only the last table
might needs extra entries.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-05-23 14:01:03 +08:00
Vitaly Chikunov
3ecc972599 crypto: rsa - unimplement sign/verify for raw RSA backends
In preparation for new akcipher verify call remove sign/verify callbacks
from RSA backends and make PKCS1 driver call encrypt/decrypt instead.

This also complies with the well-known idea that raw RSA should never be
used for sign/verify. It only should be used with proper padding scheme
such as PKCS1 driver provides.

Cc: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Cc: qat-linux@intel.com
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Horia Geantă <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Signed-off-by: Vitaly Chikunov <vt@altlinux.org>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-04-18 22:15:02 +08:00
Wen Yang
00e8744943 crypto: caam - add missing put_device() call
The of_find_device_by_node() takes a reference to the underlying device
structure, we should release that reference.

Fixes: 35af640386 ("crypto: caam - Check for CAAM block presence before registering with crypto layer")
Fixes: b189817cf7 ("crypto: caam/qi - add ablkcipher and authenc algorithms")
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Wen Yang <yellowriver2010@hotmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-03-07 16:24:52 +08:00
Horia Geantă
d239b10d4c crypto: caam - add register map changes cf. Era 10
Era 10 changes the register map.

The updates that affect the drivers:
-new version registers are added
-DBG_DBG[deco_state] field is moved to a new register -
DBG_EXEC[19:16] @ 8_0E3Ch.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-11-16 14:11:03 +08:00
Horia Geantă
618b5dc483 crypto: caam - add SPDX license identifier to all files
Previously, a tree-wide change added SPDX license identifiers to
files lacking licensing information:
b24413180f ("License cleanup: add SPDX GPL-2.0 license identifier to files with no license")

To be consistent update the rest of the files:
-files with license specified by means of MODULE_LICENSE()
-files with complete license text
-Kconfig

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-10-17 14:16:18 +08:00
Horia Geantă
f1bf9e60a0 crypto: caam - fix DMA mapping direction for RSA forms 2 & 3
Crypto engine needs some temporary locations in external memory for
running RSA decrypt forms 2 and 3 (CRT).
These are named "tmp1" and "tmp2" in the PDB.

Update DMA mapping direction of tmp1 and tmp2 from TO_DEVICE to
BIDIRECTIONAL, since engine needs r/w access.

Cc: <stable@vger.kernel.org> # 4.13+
Fixes: 52e26d77b8 ("crypto: caam - add support for RSA key form 2")
Fixes: 4a651b122a ("crypto: caam - add support for RSA key form 3")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-08-25 19:50:41 +08:00
Horia Geantă
4bffaab373 crypto: caam - fix size of RSA prime factor q
Fix a typo where size of RSA prime factor q is using the size of
prime factor p.

Cc: <stable@vger.kernel.org> # 4.13+
Fixes: 52e26d77b8 ("crypto: caam - add support for RSA key form 2")
Fixes: 4a651b122a ("crypto: caam - add support for RSA key form 3")
Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-05-05 14:52:56 +08:00
Fabio Estevam
b930f3a229 crypto: caam: - Use kmemdup() function
Use kmemdup() rather than duplicating its implementation.

By usign kmemdup() we can also get rid of the 'val' variable.

Detected with Coccinelle script.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-04-21 00:59:04 +08:00
Horia Geantă
8a2a0dd35f crypto: caam - strip input zeros from RSA input buffer
Sometimes the provided RSA input buffer provided is not stripped
of leading zeros. This could cause its size to be bigger than that
of the modulus, making the HW complain:

caam_jr 2142000.jr1: 40000789: DECO: desc idx 7:
Protocol Size Error - A protocol has seen an error in size. When
running RSA, pdb size N < (size of F) when no formatting is used; or
pdb size N < (F + 11) when formatting is used.

Fix the problem by stripping off the leading zero from input data
before feeding it to the CAAM accelerator.

Fixes: 8c419778ab ("crypto: caam - add support for RSA algorithm")
Cc: <stable@vger.kernel.org> # 4.8+
Reported-by: Martin Townsend <mtownsend1973@gmail.com>
Link: https://lkml.kernel.org/r/CABatt_ytYORYKtApcB4izhNanEKkGFi9XAQMjHi_n-8YWoCRiw@mail.gmail.com
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-04-21 00:59:03 +08:00
Herbert Xu
035f901eac Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Merge the crypto tree to pull in fixes for the next merge window.
2017-07-05 15:17:26 +08:00
Horia Geantă
019d62db54 crypto: caam - fix gfp allocation flags (part II)
This is the 2nd part of fixing the usage of GFP_KERNEL for memory
allocations, taking care off all the places that haven't caused a real
problem / failure.
Again, the issue being fixed is that GFP_KERNEL should be used only when
MAY_SLEEP flag is set, i.e. MAY_BACKLOG flag usage is orthogonal.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-06-22 16:47:23 +08:00
Tudor-Dan Ambarus
e198429c41 crypto: caampkc - comply with crypto_akcipher_maxsize()
crypto_akcipher_maxsize() asks for the output buffer size without
caring for errors. It allways assume that will be called after
a valid setkey. Comply with it and return what he wants.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-06-10 12:04:30 +08:00
Radu Alexe
4a651b122a crypto: caam - add support for RSA key form 3
CAAM RSA private key may have either of three representations.

1. The first representation consists of the pair (n, d), where the
   components have the following meanings:
      n      the RSA modulus
      d      the RSA private exponent

2. The second representation consists of the triplet (p, q, d), where
the
   components have the following meanings:
      p      the first prime factor of the RSA modulus n
      q      the second prime factor of the RSA modulus n
      d      the RSA private exponent

3. The third representation consists of the quintuple (p, q, dP, dQ,
qInv),
   where the components have the following meanings:
      p      the first prime factor of the RSA modulus n
      q      the second prime factor of the RSA modulus n
      dP     the first factors's CRT exponent
      dQ     the second factors's CRT exponent
      qInv   the (first) CRT coefficient

The benefit of using the third or the second key form is lower
computational cost for the decryption and signature operations.

This patch adds support for the third RSA private key
representations and extends caampkc to use the fastest key when all
related components are present in the private key.

Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-05-18 13:19:51 +08:00
Radu Alexe
52e26d77b8 crypto: caam - add support for RSA key form 2
CAAM RSA private key may have either of three representations.

1. The first representation consists of the pair (n, d), where the
   components have the following meanings:
      n      the RSA modulus
      d      the RSA private exponent

2. The second representation consists of the triplet (p, q, d), where
the
   components have the following meanings:
      p      the first prime factor of the RSA modulus n
      q      the second prime factor of the RSA modulus n
      d      the RSA private exponent

3. The third representation consists of the quintuple (p, q, dP, dQ,
qInv),
   where the components have the following meanings:
      p      the first prime factor of the RSA modulus n
      q      the second prime factor of the RSA modulus n
      dP     the first factors's CRT exponent
      dQ     the second factors's CRT exponent
      qInv   the (first) CRT coefficient

The benefit of using the third or the second key form is lower
computational cost for the decryption and signature operations.

This patch adds support for the second RSA private key
representation.

Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-05-18 13:19:51 +08:00
Radu Alexe
7ca4a9a10f crypto: caam - incapsulate dropping leading zeros into function
This function will be used into further patches.

Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-05-18 13:19:50 +08:00
Tudor Ambarus
7fcaf62a9f crypto: caam - avoid kzalloc(0) in caam_read_raw_data
The function returns NULL if buf is composed only of zeros.

Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-05-18 13:19:50 +08:00
Horia Geantă
33fa46d7b3 crypto: caam - fix invalid dereference in caam_rsa_init_tfm()
In case caam_jr_alloc() fails, ctx->dev carries the error code,
thus accessing it with dev_err() is incorrect.

Cc: <stable@vger.kernel.org> # 4.8+
Fixes: 8c419778ab ("crypto: caam - add support for RSA algorithm")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-04-05 21:20:16 +08:00
Horia Geantă
8439e94fce crypto: caam - fix sparse warnings
Fix the following sparse warning (note that endianness issues
are not not addressed in current patch):

drivers/crypto/caam/ctrl.c:388:24: warning: incorrect type in argument 1 (different address spaces)
drivers/crypto/caam/ctrl.c:388:24:    expected void [noderef] <asn:2>*reg
drivers/crypto/caam/ctrl.c:388:24:    got unsigned int *<noident>
drivers/crypto/caam/ctrl.c:390:24: warning: incorrect type in argument 1 (different address spaces)
drivers/crypto/caam/ctrl.c:390:24:    expected void [noderef] <asn:2>*reg
drivers/crypto/caam/ctrl.c:390:24:    got unsigned int *<noident>
drivers/crypto/caam/ctrl.c:548:24: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:548:24:    expected struct caam_ctrl [noderef] <asn:2>*ctrl
drivers/crypto/caam/ctrl.c:548:24:    got struct caam_ctrl *<noident>
drivers/crypto/caam/ctrl.c:550:30: warning: cast removes address space of expression
drivers/crypto/caam/ctrl.c:549:26: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:549:26:    expected struct caam_assurance [noderef] <asn:2>*assure
drivers/crypto/caam/ctrl.c:549:26:    got struct caam_assurance *<noident>
drivers/crypto/caam/ctrl.c:554:28: warning: cast removes address space of expression
drivers/crypto/caam/ctrl.c:553:24: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:553:24:    expected struct caam_deco [noderef] <asn:2>*deco
drivers/crypto/caam/ctrl.c:553:24:    got struct caam_deco *<noident>
drivers/crypto/caam/ctrl.c:634:48: warning: cast removes address space of expression
drivers/crypto/caam/ctrl.c:633:44: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:633:44:    expected struct caam_job_ring [noderef] <asn:2>*<noident>
drivers/crypto/caam/ctrl.c:633:44:    got struct caam_job_ring *<noident>
drivers/crypto/caam/ctrl.c:648:34: warning: cast removes address space of expression
drivers/crypto/caam/ctrl.c:647:30: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:647:30:    expected struct caam_queue_if [noderef] <asn:2>*qi
drivers/crypto/caam/ctrl.c:647:30:    got struct caam_queue_if *<noident>
drivers/crypto/caam/ctrl.c:806:37: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:806:37:    expected void *data
drivers/crypto/caam/ctrl.c:806:37:    got unsigned int [noderef] <asn:2>*
drivers/crypto/caam/ctrl.c:814:38: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:814:38:    expected void *data
drivers/crypto/caam/ctrl.c:814:38:    got unsigned int [noderef] <asn:2>*
drivers/crypto/caam/ctrl.c:822:38: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/ctrl.c:822:38:    expected void *data
drivers/crypto/caam/ctrl.c:822:38:    got unsigned int [noderef] <asn:2>*
drivers/crypto/caam/jr.c:492:23: warning: incorrect type in assignment (different address spaces)
drivers/crypto/caam/jr.c:492:23:    expected struct caam_job_ring [noderef] <asn:2>*rregs
drivers/crypto/caam/jr.c:492:23:    got struct caam_job_ring *<noident>
drivers/crypto/caam/caampkc.c:398:35: warning: Using plain integer as NULL pointer
drivers/crypto/caam/caampkc.c:444:35: warning: Using plain integer as NULL pointer

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-11-13 17:45:08 +08:00
Tudor Ambarus
8c419778ab crypto: caam - add support for RSA algorithm
Add RSA support to caam driver.

Initial author is Yashpal Dutta <yashpal.dutta@freescale.com>.

Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-07-05 23:05:24 +08:00