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/* RMAP stack and RMAP driver interface implementation
*
* COPYRIGHT (c) 2009
* Aeroflex Gaisler.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* 2009-11-17, Daniel Hellstrom <daniel@gaisler.com>
* Created
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rmap.h"
#ifdef DEBUG
#define DBG(args...) printf(args);
#else
#define DBG(args...)
#endif
struct rmap_async_priv {
struct rmap_config *config; /* Configuration */
unsigned short tid; /* Current TID */
char drv_cap; /* Driver capabiliteis */
rtems_id lock; /* Optional Semaphore protection against multiple threads (thread-safe) */
int resp_array_len; /* Length of cmds array */
struct rmap_command *cmds[]; /* RMAP commands waiting for response */
};
void *rmap_async_init(struct rmap_config *config, int response_array_length)
{
struct rmap_async_priv *priv;
int status;
priv = (struct rmap_async_priv *)malloc(sizeof(struct rmap_async_priv));
if ( !priv )
return NULL;
memset(priv, 0, sizeof(struct rmap_async_priv) +
(response_array_length * sizeof(struct rmap_command *)));
priv->config = config;
if (config->tid_msb >= 0) {
priv->tid = config->tid_msb << 8;
}
priv->drv_cap = config->drv_cap;
priv->resp_array_len = response_array_length;
/* Create Semaphore used to make RMAP layer Thread-safe */
if (config->thread_safe) {
status = rtems_semaphore_create(
rtems_build_name('R', 'M', 'A', 'P' + rmap_stack_count++),
1,
RTEMS_FIFO | RTEMS_COUNTING_SEMAPHORE | RTEMS_NO_INHERIT_PRIORITY | \
RTEMS_LOCAL | RTEMS_NO_PRIORITY_CEILING,
0,
&priv->lock);
if ( status != RTEMS_SUCCESSFUL ) {
printf("RMAP_INIT: Failed to create semaphore: %d\n", status);
free(priv);
return NULL;
}
DBG("RMAP_INIT: semaphore ID: 0x%x (%p)\n", priv->lock, &priv->lock);
}
return priv;
}
void rmap_async_reset(void *cookie)
{
struct rmap_async_priv *priv = cookie;
memset(priv->cmds, 0,
priv->resp_array_len * sizeof(struct rmap_command *));
}
static struct rmap_command *rmap_find_async(void *cookie, unsigned short tid)
{
struct rmap_async_priv *priv = cookie;
struct rmap_command *cmd;
int i;
for (i = 0; i<priv->resp_array_len; i++) {
cmd = priv->cmds[i];
if ((cmd != NULL) && (cmd->tid == tid)) {
priv->cmds[i] = NULL;
return cmd;
}
}
return NULL;
}
static int rmap_add_async(void *cookie, struct rmap_command *cmd)
{
struct rmap_async_priv *priv = cookie;
int i, status, ret;
if (priv->lock) {
status = rtems_semaphore_obtain(priv->lock, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
if (status != RTEMS_SUCCESSFUL) {
printf("RMAP-STACK: FAILED TO OBTAIN LOCK: %d (%x)\n",
status, (unsigned int)priv->lock);
return -2;
}
}
for (i = 0; i<priv->resp_array_len; i++) {
if (priv->cmds[i] == NULL) {
priv->cmds[i] = cmd;
ret = 0;
goto out_sem;
}
}
ret = -1;
out_sem:
if (priv->lock)
rtems_semaphore_release(priv->lock);
return ret;
}
int rmap_send_async(void *cookie, struct rmap_command *cmd, struct rmap_spw_pkt *pkt)
{
struct rmap_async_priv *priv = cookie;
int wait_response;
if ( !priv || !cmd || !pkt )
return -1;
/*** Check invalid command type ***/
if ( (cmd->type > RMAP_CMD_WIVA) ||
((cmd->type < RMAP_CMD_RMWI) && (cmd->type != RMAP_CMD_RS) && (cmd->type != RMAP_CMD_RI))
)
return -1;
if ( (cmd->type == RMAP_CMD_RMWI) && (cmd->data.read_m_write.length != 1) &&
(cmd->data.read_m_write.length != 2) && (cmd->data.read_m_write.length != 4)
)
return -1;
/*** Determine if stack must wait for response to arrive after transmission ***/
wait_response = 0;
if ( ((cmd->type & RMAP_CMD_WRITE) == 0) || /* READ ALWAYS RETURNS DATA */
(cmd->type & RMAP_CMD_ACKNOWLEDGE) /* WAIT FOR ACK */
)
wait_response = 1;
/*** Check that READ/WRITE length is within boundaries ***/
if ( (cmd->type & RMAP_CMD_WRITE) && (cmd->data.write.length > (priv->config->max_tx_len-4)) ) {
return -1;
}
if ( ((cmd->type & RMAP_CMD_WRITE) == 0) && (cmd->data.read.length > (priv->config->max_rx_len)) ) {
return -1;
}
/*** Build command ***/
pkt->hlen = 0;
pkt->dlen = 0;
pkt->options = 0;
if ( rmap_build((struct rmap_common_priv *)priv, cmd, pkt) ) {
return -2;
}
/* Add packet to response list */
if (wait_response) {
cmd->status = 0xff; /* indicate to be updated by response */
if (rmap_add_async(priv, cmd))
return -3;
} else {
cmd->status = 0; /* no response expected. Ok status. */
}
return wait_response;
}
int rmap_recv_async(void *cookie, struct rmap_spw_pkt *pkt, struct rmap_command **pcmd)
{
struct rmap_async_priv *priv = cookie;
struct rmap_command *cmd;
unsigned char *data = pkt->data;
unsigned short tid;
if (!priv || !pkt || !data)
return -1;
/*** From TID find Command structure ***/
tid = (data[5] << 8) |data[6];
/* if *pcmd is not NULL, user wants to find a specific command */
if (pcmd && (*pcmd != NULL) && (tid != (*pcmd)->tid))
return 1;
/* Fuind in table of old requests */
cmd = rmap_find_async(priv, tid);
if (!cmd)
return -2;
if (pcmd && (*pcmd == NULL))
*pcmd = cmd;
/* Parse input packet */
if (rmap_parse((struct rmap_common_priv *)priv, cmd, pkt) != 0)
return -3; /* Got wrong packet, for example wrong TID */
return 0;
}
int rmap_cancel_async(void *cookie, struct rmap_command *cmd)
{
struct rmap_async_priv *priv = cookie;
int i;
for (i = 0; i<priv->resp_array_len; i++) {
if (priv->cmds[i] == cmd) {
priv->cmds[i] = NULL;
return 0;
}
}
return -1; /* didn't find command in table */
}
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