/*
This routine is called to send data to the hardware. It is known a-priori
that there is free buffer space (dp->tx_next).
*/
static void
dp83902a_send(unsigned char *data, int total_len, unsigned long key)
{
struct dp83902a_priv_data *dp = (struct dp83902a_priv_data *) &nic;
cyg_uint8 *base = dp->base;
int len, start_page, pkt_len, i, isr;
#if DEBUG & 4
int dx;
#endif
DEBUG_FUNCTION();
len = pkt_len = total_len;
if (pkt_len < IEEE_8023_MIN_FRAME) pkt_len = IEEE_8023_MIN_FRAME;
start_page = dp->tx_next;
if (dp->tx_next == dp->tx_buf1) {
dp->tx1 = start_page;
dp->tx1_len = pkt_len;
dp->tx1_key = key;
dp->tx_next = dp->tx_buf2;
} else {
dp->tx2 = start_page;
dp->tx2_len = pkt_len;
dp->tx2_key = key;
dp->tx_next = dp->tx_buf1;
}
#if DEBUG & 5
printf("TX prep page %d len %d\n", start_page, pkt_len);
#endif
DP_OUT(base, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */
{
/* Dummy read. The manual sez something slightly different, */
/* but the code is extended a bit to do what Hitachi's monitor */
/* does (i.e., also read data). */
cyg_uint16 tmp;
int len = 1;
DP_OUT(base, DP_RSAL, 0x100-len);
DP_OUT(base, DP_RSAH, (start_page-1) & 0xff);
DP_OUT(base, DP_RBCL, len);
DP_OUT(base, DP_RBCH, 0);
DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_RDMA | DP_CR_START);
DP_IN_DATA(dp->data, tmp);
}
#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA
/* Stall for a bit before continuing to work around random data */
/* corruption problems on some platforms. */
CYGACC_CALL_IF_DELAY_US(1);
#endif
/* Send data to device buffer(s) */
DP_OUT(base, DP_RSAL, 0);
DP_OUT(base, DP_RSAH, start_page);
DP_OUT(base, DP_RBCL, pkt_len & 0xFF);
DP_OUT(base, DP_RBCH, pkt_len >> 8);
DP_OUT(base, DP_CR, DP_CR_WDMA | DP_CR_START);
/* Put data into buffer */
#if DEBUG & 4
printf(" sg buf %08lx len %08x\n ", (unsigned long) data, len);
dx = 0;
#endif
while (len > 0) {
#if DEBUG & 4
printf(" %02x", *data);
if (0 == (++dx % 16)) printf("\n ");
#endif
DP_OUT_DATA(dp->data, *data++);
len--;
}
#if DEBUG & 4
printf("\n");
#endif
if (total_len < pkt_len) {
#if DEBUG & 4
printf(" + %d bytes of padding\n", pkt_len - total_len);
#endif
/* Padding to 802.3 length was required */
for (i = total_len; i < pkt_len;) {
i++;
DP_OUT_DATA(dp->data, 0);
}
}
#ifdef CYGHWR_NS_DP83902A_PLF_BROKEN_TX_DMA
/* After last data write, delay for a bit before accessing the */
/* device again, or we may get random data corruption in the last */
/* datum (on some platforms). */
CYGACC_CALL_IF_DELAY_US(1);
#endif
/* Wait for DMA to complete */
do {
DP_IN(base, DP_ISR, isr);
} while ((isr & DP_ISR_RDC) == 0);
/* Then disable DMA */
DP_OUT(base, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
/* Start transmit if not already going */
if (!dp->tx_started) {
if (start_page == dp->tx1) {
dp->tx_int = 1; /* Expecting interrupt from BUF1 */
} else {
dp->tx_int = 2; /* Expecting interrupt from BUF2 */
}
dp83902a_start_xmit(start_page, pkt_len);
}
}
/*
* This routine is called to send data to the hardware. It is known a-priori
* that there is free buffer space (dp->tx_next).
*/
static void dp83902a_send(struct nic_priv_data *dp, u8 *data, int total_len, u32 key)
{
int len, start_page, pkt_len, i;
volatile int isr;
len = pkt_len = total_len;
if (pkt_len < IEEE_8023_MIN_FRAME)
pkt_len = IEEE_8023_MIN_FRAME;
start_page = dp->tx_next;
if (dp->tx_next == dp->tx_buf1) {
dp->tx1 = start_page;
dp->tx1_len = pkt_len;
dp->tx1_key = key;
dp->tx_next = dp->tx_buf2;
} else {
dp->tx2 = start_page;
dp->tx2_len = pkt_len;
dp->tx2_key = key;
dp->tx_next = dp->tx_buf1;
}
n2k_outb(dp, DP_ISR, DP_ISR_RDC); /* Clear end of DMA */
{
/*
* Dummy read. The manual sez something slightly different,
* but the code is extended a bit to do what Hitachi's monitor
* does (i.e., also read data).
*/
u16 tmp;
int len = 1;
n2k_outb(dp, DP_RSAL, 0x100 - len);
n2k_outb(dp, DP_RSAH, (start_page - 1) & 0xff);
n2k_outb(dp, DP_RBCL, len);
n2k_outb(dp, DP_RBCH, 0);
n2k_outb(dp, DP_CR, DP_CR_PAGE0 | DP_CR_RDMA | DP_CR_START);
DP_IN_DATA(dp->data, tmp);
}
/* Send data to device buffer(s) */
n2k_outb(dp, DP_RSAL, 0);
n2k_outb(dp, DP_RSAH, start_page);
n2k_outb(dp, DP_RBCL, pkt_len & 0xFF);
n2k_outb(dp, DP_RBCH, pkt_len >> 8);
n2k_outb(dp, DP_CR, DP_CR_WDMA | DP_CR_START);
/* Put data into buffer */
while (len > 0) {
DP_OUT_DATA(dp->data, *data++);
len--;
}
if (total_len < pkt_len) {
/* Padding to 802.3 length was required */
for (i = total_len; i < pkt_len;) {
i++;
DP_OUT_DATA(dp->data, 0);
}
}
/* Wait for DMA to complete */
do {
isr = n2k_inb(dp, DP_ISR);
} while ((isr & DP_ISR_RDC) == 0);
/* Then disable DMA */
n2k_outb(dp, DP_CR, DP_CR_PAGE0 | DP_CR_NODMA | DP_CR_START);
/* Start transmit if not already going */
if (!dp->tx_started) {
if (start_page == dp->tx1) {
dp->tx_int = 1; /* Expecting interrupt from BUF1 */
} else {
dp->tx_int = 2; /* Expecting interrupt from BUF2 */
}
dp83902a_start_xmit(dp, start_page, pkt_len);
}
}
