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/***********************license start***************
* Copyright (c) 2003-2010 Cavium Inc. (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Cavium Inc. nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
* This Software, including technical data, may be subject to U.S. export control
* laws, including the U.S. Export Administration Act and its associated
* regulations, and may be subject to export or import regulations in other
* countries.
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR
* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
* THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
* DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
* SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
* MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
* VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************license end**************************************/
/**
* @file
*
* Function and structure definitions for random number generator hardware
*
* <hr>$Revision: 70030 $<hr>
*/
#ifndef __CMVX_RNG_H__
#define __CMVX_RNG_H__
#ifdef __cplusplus
extern "C" {
#endif
#define CVMX_RNG_LOAD_ADDRESS CVMX_ADD_IO_SEG(cvmx_build_io_address(CVMX_OCT_DID_RNG, 0))
/**
* Structure describing the data format used for IOBDMA stores to the RNG.
*/
typedef union
{
uint64_t u64;
struct {
uint64_t scraddr : 8; /**< the (64-bit word) location in scratchpad to write to (if len != 0) */
uint64_t len : 8; /**< the number of words in the response (0 => no response) */
uint64_t did : 5; /**< the ID of the device on the non-coherent bus */
uint64_t subdid : 3; /**< the sub ID of the device on the non-coherent bus */
uint64_t addr :40; /**< the address that will appear in the first tick on the NCB bus */
} s;
} cvmx_rng_iobdma_data_t;
/**
* Enables the random number generator. Must be called before RNG is used
*/
static inline void cvmx_rng_enable(void)
{
cvmx_rnm_ctl_status_t rnm_ctl_status;
rnm_ctl_status.u64 = cvmx_read_csr(CVMX_RNM_CTL_STATUS);
rnm_ctl_status.s.ent_en = 1;
rnm_ctl_status.s.rng_en = 1;
cvmx_write_csr(CVMX_RNM_CTL_STATUS, rnm_ctl_status.u64);
}
/**
* Reads 8 bits of random data from Random number generator
*
* @return random data
*/
static inline uint8_t cvmx_rng_get_random8(void)
{
return cvmx_read64_uint8(CVMX_RNG_LOAD_ADDRESS);
}
/**
* Reads 16 bits of random data from Random number generator
*
* @return random data
*/
static inline uint16_t cvmx_rng_get_random16(void)
{
return cvmx_read64_uint16(CVMX_RNG_LOAD_ADDRESS);
}
/**
* Reads 32 bits of random data from Random number generator
*
* @return random data
*/
static inline uint32_t cvmx_rng_get_random32(void)
{
return cvmx_read64_uint32(CVMX_RNG_LOAD_ADDRESS);
}
/**
* Reads 64 bits of random data from Random number generator
*
* @return random data
*/
static inline uint64_t cvmx_rng_get_random64(void)
{
return cvmx_read64_uint64(CVMX_RNG_LOAD_ADDRESS);
}
/**
* Requests random data from the RNG block asynchronously using and IOBDMA operation.
* The random data will be written into the cores
* local memory at the specified address. A SYNCIOBDMA
* operation should be issued to stall for completion of the write.
*
* @param scr_addr Address in scratch memory to put the result
* MUST be a multiple of 8 bytes
* @param num_bytes Number of bytes of random data to write at
* scr_addr
* MUST be a multiple of 8 bytes
*
* @return 0 on success
* 1 on error
*/
static inline int cvmx_rng_request_random_async(uint64_t scr_addr, uint64_t num_bytes)
{
cvmx_rng_iobdma_data_t data;
if (num_bytes & 0x7 || scr_addr & 0x7)
return(1);
data.u64 = 0;
/* scr_addr must be 8 byte aligned */
data.s.scraddr = scr_addr >> 3;
data.s.len = num_bytes >> 3;
data.s.did = CVMX_OCT_DID_RNG;
cvmx_send_single(data.u64);
return(0);
}
#ifdef __cplusplus
}
#endif
#endif /* __CMVX_RNG_H__ */
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