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De-magic NIC rx and tx registers, cleanup

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logicog
2026-01-11 07:51:18 +01:00
parent 4e8eb6d766
commit d2d7ab7ff1
3 changed files with 33 additions and 29 deletions
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rtl837x_common.h
+15 -11
View File
@@ -36,8 +36,21 @@
// the RTL_FRAME_TAG_ID is used as part of an 8-byte tag. When VLAN is activated,
// the VLAN tag is inserted after the RTL tag
// See here for the RTL tag: https://github.com/torvalds/linux/commit/1521d5adfc2b557e15f97283c8b7ad688c3ebc40
#define RTL_TAG_SIZE 8
#define VLAN_TAG_SIZE 4
struct rtl_tag {
uint16_t tag; // This is 0x8899 for the RTL837X
uint8_t version; // Version is 4
uint8_t reason;
uint16_t flags;
uint16_t pmask; // A bit mask for a TX pkt, 4-bit port-number for RX
};
struct vlan_tag {
uint16_t svlan; // Service VLAN
uint16_t vlan;
};
#define RTL_TAG_SIZE (sizeof (struct rtl_tag))
#define VLAN_TAG_SIZE (sizeof (struct vlan_tag))
#define RTL_FRAME_TAG_ID 0x8899
// For RX and TX, an 8 byte header describing the frame to be moved to the Asic
@@ -70,15 +83,6 @@ struct flash_region_t {
extern __xdata uint8_t uip_buf[UIP_CONF_BUFFER_SIZE+2];
// 8899 04 0000 20 0004
struct rtl_tag {
uint16_t tag;
uint8_t version;
uint8_t reason;
uint16_t flags;
uint16_t pmask; // A bit mask for a TX pkt, 4-bit port-number for RX
};
// Headers for calls in the common code area (HOME/BANK0)
void print_string(__code char *p);
void print_long(__xdata uint32_t a);
rtl837x_regs.h
+6 -3
View File
@@ -93,11 +93,14 @@
*/
#define RTL837X_REG_NIC_BUFFSIZE_TX 0x7844
#define RTL837X_REG_NIC_RXBUFF_RX 0x7848
#define RTL837X_REG_NIC_RXCMD 0x784c
#define RTL837X_REG_NIC_TXCMD 0x7850
#define RTL837X_REG_RX_CTRL 0x785c
#define RTL837X_REG_TX_CTRL 0x7860
#define RTL837X_REG_RX_AVAIL 0x7874
#define RTL837X_REG_RX_RINGPTR 0x787c
#define RTL837X_REG_RX_DONE 0x784c
#define RTL837X_REG_NIC_RX_BUFF_DATA 0x7874
#define RTL837X_REG_CPU_RX_CURR_PKT 0x787c
#define RTL837X_REG_NIC_TX_CURR_PKT 0x7884
#define RTL837X_REG_CPU_TX_CURR_PKT 0x7890
#define RTL837X_REG_CPU_TAG 0x6720
#define RTL837X_REG_CPU_TAG_AWARE_PMASK 0x603C
#define RTL837X_REG_MAC_FORCE_MODE 0x6344
rtlplayground.c
+12 -15
View File
@@ -819,7 +819,7 @@ void tcpip_output(void)
uip_buf[VLAN_TAG_SIZE + 2] = uip_buf[VLAN_TAG_SIZE + 3] = 0;
uip_buf[VLAN_TAG_SIZE + 6] = uip_buf[VLAN_TAG_SIZE + 7] = 0;
reg_read_m(0x7890);
reg_read_m(RTL837X_REG_CPU_TX_CURR_PKT);
uint16_t ring_ptr = ((uint16_t)sfr_data[2]) << 8;
ring_ptr |= sfr_data[3];
@@ -835,20 +835,20 @@ void tcpip_output(void)
// Move data over from xmem buffer to ASIC side using DMA
nic_tx_packet(ring_ptr);
reg_read_m(0x7884); // actual bytes sent, for now we assume everything worked
// New position of the ring-pointer on the NIC-side indicates number of bytes transmitted
reg_read_m(RTL837X_REG_NIC_TX_CURR_PKT);
// Do actual TX of data on ASIC side
sfr_data[0] = sfr_data[1] = sfr_data[2] = 0;
sfr_data[3] = 0x1;
reg_write_m(0x7850);
REG_SET(RTL837X_REG_NIC_TXCMD, 1);
}
void handle_rx(void)
{
reg_read_m(RTL837X_REG_RX_AVAIL);
// Check the amount of data available on the NIC/ASIC side
reg_read_m(RTL837X_REG_NIC_RX_BUFF_DATA);
if (sfr_data[2] != 0 || sfr_data[3] != 0) {
reg_read_m(RTL837X_REG_RX_RINGPTR);
reg_read_m(RTL837X_REG_CPU_RX_CURR_PKT);
uint16_t ring_ptr = ((uint16_t)sfr_data[2]) << 8;
ring_ptr |= sfr_data[3];
ring_ptr <<= 3;
@@ -872,16 +872,13 @@ void handle_rx(void)
write_char(' ');
}
#endif
sfr_data[0] = sfr_data[1] = sfr_data[2] = 0;
sfr_data[3] = 0x1;
reg_write_m(RTL837X_REG_RX_DONE);
REG_SET(RTL837X_REG_NIC_RXCMD, 1);
uip_len = (((uint16_t)rx_headers[5]) << 8) | rx_headers[4];
// write_char('>'); print_byte(uip_buf[ETHERTYPE_OFFSET]); write_char('<');
// write_char('>'); print_byte(uip_buf[ETHERTYPE_OFFSET + 1]); write_char('<');
// Check for ARP packet
rx_packet_vlan = uip_buf[12 + RTL_TAG_SIZE + 2] & 0xf;
// Retrieve VLAN from VLAN-tag
rx_packet_vlan = uip_buf[2 * sizeof (struct uip_eth_addr) + RTL_TAG_SIZE + 2] & 0xf;
rx_packet_vlan <<= 8;
rx_packet_vlan |= uip_buf[12 + RTL_TAG_SIZE + 3];
rx_packet_vlan |= uip_buf[2 * sizeof (struct uip_eth_addr) + RTL_TAG_SIZE + 3];
#ifdef RXTXDBG
print_string(" RX-VLAN: "); print_short(rx_packet_vlan); write_char('\n');
print_string(" RX dst: "); print_byte(uip_buf[0]); print_byte(uip_buf[1]); print_byte(uip_buf[2]);