mirror of
https://github.com/logicog/RTLPlayground.git
synced 2026-10-29 17:54:14 +08:00
João Silva
98369c37fe
nic: move other nic functions into the dedicated nic files uip: alloc buffer multiple of 8 bytes Signed-off-by: João Silva <jgc3silva@gmail.com>
91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
#include "rtl837x_common.h"
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#include "rtl837x_regs.h"
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#include "rtl837x_sfr.h"
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#include "rtl837x_nic.h"
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extern __xdata uint8_t rx_headers[16];
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#ifndef RTLP_HOST_TEST
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/* One RX DMA operation, starting inside the configured ring. The hardware
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* wraps transfers that cross its end; the initial address must be normalized.
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* Host tests supply a simulated DMA engine for this hardware boundary. */
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bool nic_rx_dma(__xdata uint8_t *buffer, uint16_t ring_ptr, uint8_t words) __reentrant
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{
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uint16_t guard = 0;
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SFR_NIC_DATA_U16LE = (uint16_t)buffer;
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SFR_NIC_RING_U16LE = ring_ptr;
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SFR_NIC_CTRL = words;
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while (SFR_NIC_CTRL != 0) {
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if (++guard == 0) {
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print_string("NIC: RX transfer did not complete\n");
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return false;
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}
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}
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return true;
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}
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#endif
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static bool nic_rx_copy(__xdata uint8_t *buffer, uint16_t ring_ptr, uint8_t words) __reentrant
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{
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if (ring_ptr > RTL837X_NIC_RX_RING_BYTES || (ring_ptr & 7))
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return false;
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if (ring_ptr == RTL837X_NIC_RX_RING_BYTES)
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ring_ptr = 0;
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return nic_rx_dma(buffer, ring_ptr, words);
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}
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bool nic_rx_header(uint16_t ring_ptr) __reentrant
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{
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if (ring_ptr >= RTL837X_NIC_RX_RING_BYTES)
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return false;
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return nic_rx_copy(rx_headers, ring_ptr, 1);
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}
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bool nic_rx_packet(__xdata uint8_t *buffer, uint16_t ring_ptr) __reentrant
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{
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uint16_t len = ((uint16_t)rx_headers[5] << 8) | rx_headers[4];
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if (!len || len > UIP_CONF_BUFFER_SIZE)
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return false;
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return nic_rx_copy(buffer, ring_ptr, (len + 7) >> 3);
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}
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/*
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* Transfers data in XMEM to the ASIC for transmission by the NIC
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*/
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void nic_tx_packet(__xdata uint8_t *buffer, uint16_t len, uint16_t ring_ptr)
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{
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uint16_t guard = 0;
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SFR_NIC_DATA_U16LE = (uint16_t)(uintptr_t)buffer;
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#ifdef RXTXDBG
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print_string("TX: \n");
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for (uint8_t i = 0; i < 100; i++) {
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print_byte(uip_buf[i]);
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write_char(' ');
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}
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write_char('\n');
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#endif
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ring_ptr <<= 3;
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ring_ptr |= 0x8000;
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SFR_NIC_RING_U16LE = ring_ptr;
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len += 0xf;
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len >>= 3;
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SFR_NIC_CTRL = len;
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while (SFR_NIC_CTRL != 0) {
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if (++guard == 0) {
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print_string("NIC: TX transfer did not complete\n");
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return;
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}
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}
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}
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