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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@289 35acf78f-673a-0410-8e92-d51de3d6d3f4

This commit is contained in:
gdisirio 2008-05-13 15:33:52 +00:00
parent 6320aaba73
commit 95bcaa2450
2 changed files with 157 additions and 17 deletions
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160
ports/ARM7-AT91SAM7X/sam7x_emac.c
View File

@ -19,6 +19,8 @@
#include <ch.h>
#include <string.h>
#include "board.h"
#include "sam7x_emac.h"
#include "mii.h"
@ -29,14 +31,19 @@
#define EMAC_TRANSMIT_BUFFERS 2
#define EMAC_TRANSMIT_BUFFERS_SIZE 1518
EventSource EMACFrameTransmitted, EMACFrameReceived;
EventSource EMACFrameTransmitted; /* A frame was transmitted. */
EventSource EMACFrameReceived; /* A frame was received. */
static int received; /* Buffered frames counter. */
static uint8_t default_mac[] = {0xAA, 0x55, 0x13, 0x37, 0x01, 0x10};
static BufDescriptorEntry rent[EMAC_RECEIVE_BUFFERS] __attribute__((aligned(4)));
static uint8_t rbuffers[EMAC_RECEIVE_BUFFERS * EMAC_RECEIVE_BUFFERS_SIZE] __attribute__((aligned(4)));
static BufDescriptorEntry tent[EMAC_TRANSMIT_BUFFERS] __attribute__((aligned(4)));
static uint8_t tbuffers[EMAC_TRANSMIT_BUFFERS * EMAC_TRANSMIT_BUFFERS_SIZE] __attribute__((aligned(4)));
static BufDescriptorEntry rent[EMAC_RECEIVE_BUFFERS] __attribute__((aligned(8)));
static uint8_t rbuffers[EMAC_RECEIVE_BUFFERS * EMAC_RECEIVE_BUFFERS_SIZE] __attribute__((aligned(8)));
static unsigned rxidx;
static BufDescriptorEntry tent[EMAC_TRANSMIT_BUFFERS] __attribute__((aligned(8)));
static uint8_t tbuffers[EMAC_TRANSMIT_BUFFERS * EMAC_TRANSMIT_BUFFERS_SIZE] __attribute__((aligned(8)));
static unsigned txidx;
#define PHY_ADDRESS 1
#define AT91C_PB15_ERXDV AT91C_PB15_ERXDV_ECRSDV
@ -126,8 +133,10 @@ static void ServeInterrupt(void) {
tsr = AT91C_BASE_EMAC->EMAC_TSR;
if ((isr & AT91C_EMAC_RCOMP) || (rsr & RSR_BITS)) {
if (rsr & AT91C_EMAC_REC)
if (rsr & AT91C_EMAC_REC) {
received++;
chEvtSendI(&EMACFrameReceived);
}
AT91C_BASE_EMAC->EMAC_RSR = RSR_BITS;
}
@ -156,17 +165,19 @@ void InitEMAC(int prio) {
/*
* Buffers initialization.
*/
received = 0;
for (i = 0; i < EMAC_RECEIVE_BUFFERS; i++) {
rent[i].w1 = (uint32_t)&rbuffers[i * EMAC_RECEIVE_BUFFERS_SIZE];
rent[i].w2 = 0;
}
rent[EMAC_RECEIVE_BUFFERS - 1].w1 |= W1_R_WRAP;
rxidx = 0;
for (i = 0; i < EMAC_TRANSMIT_BUFFERS; i++) {
rent[i].w1 = ((uint32_t)&tbuffers[i * EMAC_TRANSMIT_BUFFERS_SIZE]) | W2_T_USED;
tent[i].w2 = 0;
tent[i].w1 = ((uint32_t)&tbuffers[i * EMAC_TRANSMIT_BUFFERS_SIZE]);
tent[i].w2 = EMAC_TRANSMIT_BUFFERS_SIZE | W2_T_LAST_BUFFER | W2_T_USED;
}
tent[EMAC_TRANSMIT_BUFFERS - 1].w1 |= W2_T_WRAP;
tent[EMAC_TRANSMIT_BUFFERS - 1].w2 |= W2_T_WRAP;
txidx = 0;
/*
* Disables the pullups on all the pins that are latched on reset by the PHY.
@ -222,8 +233,7 @@ void InitEMAC(int prio) {
AT91C_BASE_EMAC->EMAC_RSR = AT91C_EMAC_OVR |
AT91C_EMAC_REC |
AT91C_EMAC_BNA; // Clears RSR
AT91C_BASE_EMAC->EMAC_NCFGR |= AT91C_EMAC_CAF |
AT91C_EMAC_NBC |
AT91C_BASE_EMAC->EMAC_NCFGR |= AT91C_EMAC_NBC |
AT91C_EMAC_DRFCS; // Initial NCFGR settings
AT91C_BASE_EMAC->EMAC_NCR |= AT91C_EMAC_TE |
AT91C_EMAC_RE |
@ -244,7 +254,7 @@ void InitEMAC(int prio) {
/*
* Interrupt setup.
*/
AT91C_BASE_EMAC->EMAC_IER = AT91C_EMAC_RCOMP;
AT91C_BASE_EMAC->EMAC_IER = AT91C_EMAC_RCOMP | AT91C_EMAC_TCOMP;
AIC_ConfigureIT(AT91C_ID_EMAC,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL | prio,
EMACIrqHandler);
@ -269,8 +279,128 @@ void EMACSetAddress(uint8_t *eaddr) {
/*
* Transmits an ethernet frame.
* Returns TRUE if the frame is queued for transmission else FALSE.
*/
bool_t EMACTransmit(uint8_t *hdr, uint8_t *data, size_t size) {
bool_t EMACTransmit(struct MACHeader *hdr, uint8_t *data, size_t size) {
uint8_t *p;
unsigned i;
return FALSE;
chDbgAssert((hdr != NULL) || (data != NULL),
"sam7x_emac.c, EMACTransmit #1");
chDbgAssert(size <= (hdr ? EMAC_TRANSMIT_BUFFERS_SIZE - sizeof(struct MACHeader) :
EMAC_TRANSMIT_BUFFERS_SIZE),
"sam7x_emac.c, EMACTransmit #2");
chSysLock();
i = txidx;
if (!(tent[i].w2 & W2_T_USED) ||
(tent[i].w2 & W2_T_LOCKED)) {
chSysUnlock();
return FALSE;
}
tent[i].w2 |= W2_T_LOCKED; /* Locks the buffer while copying.*/
if (++txidx >= EMAC_TRANSMIT_BUFFERS)
txidx = 0;
chSysUnlock();
p = (uint8_t *)tent[i].w1;
if (hdr) {
memcpy(p, hdr, sizeof(struct MACHeader));
p += sizeof(struct MACHeader);
}
if (data) {
memcpy(p, data, size);
p += size;
}
tent[i].w2 &= ~W2_R_LENGTH_MASK;
tent[i].w2 |= p - (uint8_t *)tent[i].w1;
chSysLock();
tent[i].w2 &= ~(W2_T_USED | W2_T_LOCKED);
AT91C_BASE_EMAC->EMAC_NCR |= AT91C_EMAC_TSTART;
chSysUnlock();
return TRUE;
}
/*
* Reads a buffered frame.
* Returns TRUE if a frame was present and read else FALSE.
* Note, it is not thread safe, it would require a semaphore or a mutex.
*/
bool_t EMACReceive(uint8_t *buf, size_t *sizep) {
unsigned n;
size_t size;
uint8_t *p;
bool_t overflow, found;
chSysLock();
if (received <= 0) {
chSysUnlock();
return FALSE;
}
received--;
chSysUnlock();
n = EMAC_RECEIVE_BUFFERS;
/*
* Skips unused buffers, if any.
*/
skip:
while (n && !(rent[rxidx].w1 & W1_R_OWNERSHIP)) {
if (++rxidx >= EMAC_RECEIVE_BUFFERS)
rxidx = 0;
n--;
}
/*
* Skips fragments, if any.
*/
while (n && (rent[rxidx].w1 & W1_R_OWNERSHIP) && !(rent[rxidx].w2 & W2_R_FRAME_START)) {
rent[rxidx].w1 &= ~W1_R_OWNERSHIP;
if (++rxidx >= EMAC_RECEIVE_BUFFERS)
rxidx = 0;
n--;
}
restart:
p = buf;
size = 0;
found = overflow = FALSE;
while (n && !found) {
size_t segsize;
if (!(rent[rxidx].w1 & W1_R_OWNERSHIP))
goto skip; /* Empty buffer for some reason... */
if (size && (rent[rxidx].w2 & W2_R_FRAME_START))
goto restart; /* Another start buffer for some reason... */
if (rent[rxidx].w2 & W2_R_FRAME_END) {
segsize = (rent[rxidx].w2 & W2_T_LENGTH_MASK) - size;
if (((rent[rxidx].w2 & W2_T_LENGTH_MASK) > *sizep) ||
(segsize > EMAC_RECEIVE_BUFFERS_SIZE))
overflow = TRUE;
found = TRUE;
}
else {
segsize = EMAC_RECEIVE_BUFFERS_SIZE;
if (size + segsize > *sizep)
overflow = TRUE;
}
if (!overflow) {
memcpy(p, (void *)(rent[rxidx].w1 & W1_T_BUFFER_MASK), segsize);
p += segsize;
size += segsize;
}
rent[rxidx++].w1 &= ~W1_R_OWNERSHIP;
if (rxidx >= EMAC_RECEIVE_BUFFERS)
rxidx = 0;
n--;
}
*sizep = size;
return found && !overflow;
}

14
ports/ARM7-AT91SAM7X/sam7x_emac.h
View File

@ -47,8 +47,11 @@ typedef struct {
#define W2_R_MULTICAST_MATCH 0x40000000
#define W2_R_BROADCAST_DETECTED 0x80000000
#define W1_T_BUFFER_MASK 0xFFFFFFFC
#define W2_T_LENGTH_MASK 0x000007FF
#define W2_T_RFU1 0x00003800
#define W2_T_LOCKED 0x00000800 /* Not an EMAC flag, used by the driver */
#define W2_T_RFU1 0x00003000
#define W2_T_LAST_BUFFER 0x00004000
#define W2_T_NO_CRC 0x00008000
#define W2_T_RFU2 0x07FF0000
@ -58,12 +61,19 @@ typedef struct {
#define W2_T_WRAP 0x40000000
#define W2_T_USED 0x80000000
struct MACHeader {
uint8_t destination[6];
uint8_t source[6];
uint8_t ethertype[2];
};
#ifdef __cplusplus
extern "C" {
#endif
void InitEMAC(int prio);
void EMACSetAddress(uint8_t *eaddr);
bool_t EMACTransmit(uint8_t *hdr, uint8_t *data, size_t size);
bool_t EMACTransmit(struct MACHeader *hdr, uint8_t *data, size_t size);
bool_t EMACReceive(uint8_t *buf, size_t *sizep);
#ifdef __cplusplus
}
#endif