272 lines
6.3 KiB
C
272 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 2019 Antmicro <www.antmicro.com>
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT litex_eth0
|
|
|
|
#define LOG_MODULE_NAME eth_liteeth
|
|
#define LOG_LEVEL CONFIG_ETHERNET_LOG_LEVEL
|
|
|
|
#include <logging/log.h>
|
|
LOG_MODULE_REGISTER(LOG_MODULE_NAME);
|
|
|
|
#include <kernel.h>
|
|
#include <device.h>
|
|
#include <soc.h>
|
|
#include <stdbool.h>
|
|
#include <net/ethernet.h>
|
|
#include <net/net_if.h>
|
|
#include <net/net_pkt.h>
|
|
|
|
#include <sys/printk.h>
|
|
|
|
/* flags */
|
|
#define LITEETH_EV_TX 0x1
|
|
#define LITEETH_EV_RX 0x1
|
|
|
|
/* slots */
|
|
#define LITEETH_SLOT_BASE DT_INST_REG_ADDR_BY_NAME(0, buffers)
|
|
#define LITEETH_SLOT_RX0 ((LITEETH_SLOT_BASE) + 0x0000)
|
|
#define LITEETH_SLOT_RX1 ((LITEETH_SLOT_BASE) + 0x0800)
|
|
#define LITEETH_SLOT_TX0 ((LITEETH_SLOT_BASE) + 0x1000)
|
|
#define LITEETH_SLOT_TX1 ((LITEETH_SLOT_BASE) + 0x1800)
|
|
|
|
/* sram - rx */
|
|
#define LITEETH_RX_BASE DT_INST_REG_ADDR_BY_NAME(0, control)
|
|
#define LITEETH_RX_SLOT ((LITEETH_RX_BASE) + 0x00)
|
|
#define LITEETH_RX_LENGTH ((LITEETH_RX_BASE) + 0x04)
|
|
#define LITEETH_RX_EV_PENDING ((LITEETH_RX_BASE) + 0x28)
|
|
#define LITEETH_RX_EV_ENABLE ((LITEETH_RX_BASE) + 0x2c)
|
|
|
|
/* sram - tx */
|
|
#define LITEETH_TX_BASE ((DT_INST_REG_ADDR_BY_NAME(0, control)) + 0x30)
|
|
#define LITEETH_TX_START ((LITEETH_TX_BASE) + 0x00)
|
|
#define LITEETH_TX_READY ((LITEETH_TX_BASE) + 0x04)
|
|
#define LITEETH_TX_SLOT ((LITEETH_TX_BASE) + 0x0c)
|
|
#define LITEETH_TX_LENGTH ((LITEETH_TX_BASE) + 0x10)
|
|
#define LITEETH_TX_EV_PENDING ((LITEETH_TX_BASE) + 0x1c)
|
|
|
|
/* irq */
|
|
#define LITEETH_IRQ DT_INST_IRQN(0)
|
|
#define LITEETH_IRQ_PRIORITY CONFIG_ETH_LITEETH_0_IRQ_PRI
|
|
|
|
/* label */
|
|
#define LITEETH_LABEL DT_INST_LABEL(0)
|
|
|
|
struct eth_liteeth_dev_data {
|
|
struct net_if *iface;
|
|
u8_t mac_addr[6];
|
|
|
|
u8_t txslot;
|
|
u8_t rxslot;
|
|
|
|
u8_t *tx_buf[2];
|
|
u8_t *rx_buf[2];
|
|
};
|
|
|
|
struct eth_liteeth_config {
|
|
void (*config_func)(void);
|
|
};
|
|
|
|
static int eth_initialize(struct device *dev)
|
|
{
|
|
const struct eth_liteeth_config *config = dev->config->config_info;
|
|
|
|
config->config_func();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int eth_tx(struct device *dev, struct net_pkt *pkt)
|
|
{
|
|
int key;
|
|
u16_t len;
|
|
struct eth_liteeth_dev_data *context = dev->driver_data;
|
|
|
|
key = irq_lock();
|
|
|
|
/* get data from packet and send it */
|
|
len = net_pkt_get_len(pkt);
|
|
net_pkt_read(pkt, context->tx_buf[context->txslot], len);
|
|
|
|
sys_write8(context->txslot, LITEETH_TX_SLOT);
|
|
sys_write8(len >> 8, LITEETH_TX_LENGTH);
|
|
sys_write8(len & 0xFF, LITEETH_TX_LENGTH + 4);
|
|
|
|
/* wait for the device to be ready to transmit */
|
|
while (sys_read8(LITEETH_TX_READY) == 0) {
|
|
;
|
|
}
|
|
|
|
/* start transmitting */
|
|
sys_write8(1, LITEETH_TX_START);
|
|
|
|
/* change slot */
|
|
context->txslot = (context->txslot + 1) % 2;
|
|
|
|
irq_unlock(key);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void eth_rx(struct device *port)
|
|
{
|
|
struct net_pkt *pkt;
|
|
struct eth_liteeth_dev_data *context = port->driver_data;
|
|
|
|
unsigned int key, r;
|
|
u16_t len = 0;
|
|
|
|
key = irq_lock();
|
|
|
|
/* get frame's length */
|
|
for (int i = 0; i < 4; i++) {
|
|
len <<= 8;
|
|
len |= sys_read8(LITEETH_RX_LENGTH + i * 0x4);
|
|
}
|
|
|
|
/* which slot is the frame in */
|
|
context->rxslot = sys_read8(LITEETH_RX_SLOT);
|
|
|
|
/* obtain rx buffer */
|
|
pkt = net_pkt_rx_alloc_with_buffer(context->iface, len, AF_UNSPEC, 0,
|
|
K_NO_WAIT);
|
|
if (pkt == NULL) {
|
|
LOG_ERR("Failed to obtain RX buffer");
|
|
goto out;
|
|
}
|
|
|
|
/* copy data to buffer */
|
|
if (net_pkt_write(pkt, (void *)context->rx_buf[context->rxslot], len) != 0) {
|
|
LOG_ERR("Failed to append RX buffer to context buffer");
|
|
net_pkt_unref(pkt);
|
|
goto out;
|
|
}
|
|
|
|
/* receive data */
|
|
r = net_recv_data(context->iface, pkt);
|
|
if (r < 0) {
|
|
LOG_ERR("Failed to enqueue frame into RX queue: %d", r);
|
|
net_pkt_unref(pkt);
|
|
}
|
|
|
|
out:
|
|
irq_unlock(key);
|
|
}
|
|
|
|
static void eth_irq_handler(struct device *port)
|
|
{
|
|
/* check sram reader events (tx) */
|
|
if (sys_read8(LITEETH_TX_EV_PENDING) & LITEETH_EV_TX) {
|
|
/* TX event is not enabled nor used by this driver; ack just
|
|
* in case if some rogue TX event appeared
|
|
*/
|
|
sys_write8(LITEETH_EV_TX, LITEETH_TX_EV_PENDING);
|
|
}
|
|
|
|
/* check sram writer events (rx) */
|
|
if (sys_read8(LITEETH_RX_EV_PENDING) & LITEETH_EV_RX) {
|
|
eth_rx(port);
|
|
|
|
/* ack writer irq */
|
|
sys_write8(LITEETH_EV_RX, LITEETH_RX_EV_PENDING);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_ETH_LITEETH_0_RANDOM_MAC
|
|
static void generate_mac(u8_t *mac_addr)
|
|
{
|
|
u32_t entropy;
|
|
|
|
entropy = sys_rand32_get();
|
|
|
|
mac_addr[3] = entropy >> 8;
|
|
mac_addr[4] = entropy >> 16;
|
|
/* Locally administered, unicast */
|
|
mac_addr[5] = ((entropy >> 0) & 0xfc) | 0x02;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ETH_LITEETH_0
|
|
|
|
static struct eth_liteeth_dev_data eth_data = {
|
|
.mac_addr = DT_INST_PROP(0, local_mac_address)
|
|
};
|
|
|
|
static void eth_irq_config(void);
|
|
static const struct eth_liteeth_config eth_config = {
|
|
.config_func = eth_irq_config,
|
|
};
|
|
|
|
static void eth_iface_init(struct net_if *iface)
|
|
{
|
|
struct device *port = net_if_get_device(iface);
|
|
struct eth_liteeth_dev_data *context = port->driver_data;
|
|
static bool init_done;
|
|
|
|
/* initialize only once */
|
|
if (init_done) {
|
|
return;
|
|
}
|
|
|
|
/* set interface */
|
|
context->iface = iface;
|
|
|
|
/* initialize ethernet L2 */
|
|
ethernet_init(iface);
|
|
|
|
#ifdef CONFIG_ETH_LITEETH_0_RANDOM_MAC
|
|
/* generate random MAC address */
|
|
generate_mac(context->mac_addr);
|
|
#endif
|
|
|
|
/* set MAC address */
|
|
net_if_set_link_addr(iface, context->mac_addr, sizeof(context->mac_addr),
|
|
NET_LINK_ETHERNET);
|
|
|
|
/* clear pending events */
|
|
sys_write8(LITEETH_EV_TX, LITEETH_TX_EV_PENDING);
|
|
sys_write8(LITEETH_EV_RX, LITEETH_RX_EV_PENDING);
|
|
|
|
/* setup tx slots */
|
|
context->txslot = 0;
|
|
context->tx_buf[0] = (u8_t *)LITEETH_SLOT_TX0;
|
|
context->tx_buf[1] = (u8_t *)LITEETH_SLOT_TX1;
|
|
|
|
/* setup rx slots */
|
|
context->rxslot = 0;
|
|
context->rx_buf[0] = (u8_t *)LITEETH_SLOT_RX0;
|
|
context->rx_buf[1] = (u8_t *)LITEETH_SLOT_RX1;
|
|
|
|
init_done = true;
|
|
}
|
|
|
|
static enum ethernet_hw_caps eth_caps(struct device *dev)
|
|
{
|
|
ARG_UNUSED(dev);
|
|
return ETHERNET_LINK_10BASE_T | ETHERNET_LINK_100BASE_T |
|
|
ETHERNET_LINK_1000BASE_T;
|
|
}
|
|
|
|
static const struct ethernet_api eth_api = {
|
|
.iface_api.init = eth_iface_init,
|
|
.get_capabilities = eth_caps,
|
|
.send = eth_tx
|
|
};
|
|
|
|
NET_DEVICE_INIT(eth0, LITEETH_LABEL, eth_initialize, device_pm_control_nop,
|
|
ð_data, ð_config, CONFIG_ETH_INIT_PRIORITY, ð_api,
|
|
ETHERNET_L2, NET_L2_GET_CTX_TYPE(ETHERNET_L2), NET_ETH_MTU);
|
|
|
|
static void eth_irq_config(void)
|
|
{
|
|
IRQ_CONNECT(LITEETH_IRQ, LITEETH_IRQ_PRIORITY, eth_irq_handler,
|
|
DEVICE_GET(eth0), 0);
|
|
irq_enable(LITEETH_IRQ);
|
|
sys_write8(1, LITEETH_RX_EV_ENABLE);
|
|
}
|
|
|
|
#endif /* CONFIG_ETH_LITEETH_0 */
|