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/*
* Copyright (c) 2015 Nuand LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef BLADERF_NIOS_PKT_32x32_H_
#define BLADERF_NIOS_PKT_32x32_H_
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
/*
* This file defines the Host <-> FPGA (NIOS II) packet formats for accesses
* to devices/blocks with 32-bit addresses and 32-bit data
*
*
* Request
* ----------------------
*
* +================+=========================================================+
* | Byte offset | Description |
* +================+=========================================================+
* | 0 | Magic Value |
* +----------------+---------------------------------------------------------+
* | 1 | Target ID (Note 1) |
* +----------------+---------------------------------------------------------+
* | 2 | Flags (Note 2) |
* +----------------+---------------------------------------------------------+
* | 3 | Reserved. Set to 0x00. |
* +----------------+---------------------------------------------------------+
* | 7:4 | 32-bit address |
* +----------------+---------------------------------------------------------+
* | 11:8 | 32-bit data, little-endian |
* +----------------+---------------------------------------------------------+
* | 15:12 | Reserved. Set to 0. |
* +----------------+---------------------------------------------------------+
*
*
* Response
* ----------------------
*
* The response packet contains the same information as the request.
* A status flag will be set if the operation completed successfully.
*
* In the case of a read request, the data field will contain the read data, if
* the read succeeded.
*
* (Note 1)
* The "Target ID" refers to the peripheral, device, or block to access.
* See the NIOS_PKT_32x32_TARGET_* values.
*
* (Note 2)
* The flags are defined as follows:
*
* +================+========================+
* | Bit(s) | Value |
* +================+========================+
* | 7:2 | Reserved. Set to 0. |
* +----------------+------------------------+
* | | Status. Only used in |
* | | response packet. |
* | | Ignored in request. |
* | 1 | |
* | | 1 = Success |
* | | 0 = Failure |
* +----------------+------------------------+
* | 0 | 0 = Read operation |
* | | 1 = Write operation |
* +----------------+------------------------+
*
*/
#define NIOS_PKT_32x32_MAGIC ((uint8_t) 'K')
/* Request packet indices */
#define NIOS_PKT_32x32_IDX_MAGIC 0
#define NIOS_PKT_32x32_IDX_TARGET_ID 1
#define NIOS_PKT_32x32_IDX_FLAGS 2
#define NIOS_PKT_32x32_IDX_RESV1 3
#define NIOS_PKT_32x32_IDX_ADDR 4
#define NIOS_PKT_32x32_IDX_DATA 8
#define NIOS_PKT_32x32_IDX_RESV2 12
/* Target IDs */
/* For the EXP and EXP_DIR targets, the address is a bitmask of values
* to read/write */
#define NIOS_PKT_32x32_TARGET_EXP 0x00 /* Expansion I/O */
#define NIOS_PKT_32x32_TARGET_EXP_DIR 0x01 /* Expansion I/O Direction reg */
#define NIOS_PKT_32x32_TARGET_ADI_AXI 0x02 /* ADI AXI Interface */
#define NIOS_PKT_32x32_TARGET_WB_MSTR 0x03 /* Wishbone Master */
/* IDs 0x80 through 0xff will not be assigned by Nuand. These are reserved
* for user customizations */
#define NIOS_PKT_32x32_TARGET_USR1 0x80
#define NIOS_PKT_32x32_TARGET_USR128 0xff
/* Flag bits */
#define NIOS_PKT_32x32_FLAG_WRITE (1 << 0)
#define NIOS_PKT_32x32_FLAG_SUCCESS (1 << 1)
/* Pack the request buffer */
static inline void nios_pkt_32x32_pack(uint8_t *buf, uint8_t target, bool write,
uint32_t addr, uint32_t data)
{
buf[NIOS_PKT_32x32_IDX_MAGIC] = NIOS_PKT_32x32_MAGIC;
buf[NIOS_PKT_32x32_IDX_TARGET_ID] = target;
if (write) {
buf[NIOS_PKT_32x32_IDX_FLAGS] = NIOS_PKT_32x32_FLAG_WRITE;
} else {
buf[NIOS_PKT_32x32_IDX_FLAGS] = 0x00;
}
buf[NIOS_PKT_32x32_IDX_RESV1] = 0x00;
buf[NIOS_PKT_32x32_IDX_ADDR + 0] = (addr >> 0);
buf[NIOS_PKT_32x32_IDX_ADDR + 1] = (addr >> 8);
buf[NIOS_PKT_32x32_IDX_ADDR + 2] = (addr >> 16);
buf[NIOS_PKT_32x32_IDX_ADDR + 3] = (addr >> 24);
buf[NIOS_PKT_32x32_IDX_DATA + 0] = (data >> 0);
buf[NIOS_PKT_32x32_IDX_DATA + 1] = (data >> 8);
buf[NIOS_PKT_32x32_IDX_DATA + 2] = (data >> 16);
buf[NIOS_PKT_32x32_IDX_DATA + 3] = (data >> 24);
buf[NIOS_PKT_32x32_IDX_RESV2 + 0] = 0x00;
buf[NIOS_PKT_32x32_IDX_RESV2 + 1] = 0x00;
buf[NIOS_PKT_32x32_IDX_RESV2 + 2] = 0x00;
buf[NIOS_PKT_32x32_IDX_RESV2 + 3] = 0x00;
}
/* Unpack the request buffer */
static inline void nios_pkt_32x32_unpack(const uint8_t *buf, uint8_t *target,
bool *write, uint32_t *addr,
uint32_t *data)
{
if (target != NULL) {
*target = buf[NIOS_PKT_32x32_IDX_TARGET_ID];
}
if (write != NULL) {
*write = (buf[NIOS_PKT_32x32_IDX_FLAGS] & NIOS_PKT_32x32_FLAG_WRITE) != 0;
}
if (addr != NULL) {
*addr = (buf[NIOS_PKT_32x32_IDX_ADDR + 0] << 0) |
(buf[NIOS_PKT_32x32_IDX_ADDR + 1] << 8) |
(buf[NIOS_PKT_32x32_IDX_ADDR + 2] << 16) |
(buf[NIOS_PKT_32x32_IDX_ADDR + 3] << 24);
}
if (data != NULL) {
*data = (buf[NIOS_PKT_32x32_IDX_DATA + 0] << 0) |
(buf[NIOS_PKT_32x32_IDX_DATA + 1] << 8) |
(buf[NIOS_PKT_32x32_IDX_DATA + 2] << 16) |
(buf[NIOS_PKT_32x32_IDX_DATA + 3] << 24);
}
}
/* Pack the response buffer */
static inline void nios_pkt_32x32_resp_pack(uint8_t *buf, uint8_t target,
bool write, uint32_t addr,
uint32_t data, bool success)
{
nios_pkt_32x32_pack(buf, target, write, addr, data);
if (success) {
buf[NIOS_PKT_32x32_IDX_FLAGS] |= NIOS_PKT_32x32_FLAG_SUCCESS;
}
}
/* Unpack the response buffer */
static inline void nios_pkt_32x32_resp_unpack(const uint8_t *buf,
uint8_t *target, bool *write,
uint32_t *addr, uint32_t *data,
bool *success)
{
nios_pkt_32x32_unpack(buf, target, write, addr, data);
if ((buf[NIOS_PKT_32x32_IDX_FLAGS] & NIOS_PKT_32x32_FLAG_SUCCESS) != 0) {
*success = true;
} else {
*success = false;
}
}
#endif
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