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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* LiteX Liteeth Ethernet
*
* Copyright 2021 Joel Stanley <joel@jms.id.au>, IBM Corp.
*/
#include <linux/litex.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <net.h>
#define LITEETH_WRITER_SLOT 0x00
#define LITEETH_WRITER_LENGTH 0x04
#define LITEETH_WRITER_ERRORS 0x08
#define LITEETH_WRITER_EV_STATUS 0x0C
#define LITEETH_WRITER_EV_PENDING 0x10
#define LITEETH_WRITER_EV_ENABLE 0x14
#define LITEETH_READER_START 0x18
#define LITEETH_READER_READY 0x1C
#define LITEETH_READER_LEVEL 0x20
#define LITEETH_READER_SLOT 0x24
#define LITEETH_READER_LENGTH 0x28
#define LITEETH_READER_EV_STATUS 0x2C
#define LITEETH_READER_EV_PENDING 0x30
#define LITEETH_READER_EV_ENABLE 0x34
#define LITEETH_PREAMBLE_CRC 0x38
#define LITEETH_PREAMBLE_ERRORS 0x3C
#define LITEETH_CRC_ERRORS 0x40
struct liteeth {
struct udevice *dev;
void __iomem *base;
u32 slot_size;
/* Tx */
u32 tx_slot;
u32 num_tx_slots;
void __iomem *tx_base;
/* Rx */
u32 rx_slot;
u32 num_rx_slots;
void __iomem *rx_base;
};
static int liteeth_recv(struct udevice *dev, int flags, uchar **packetp)
{
struct liteeth *priv = dev_get_priv(dev);
u8 rx_slot;
int len;
if (!litex_read8(priv->base + LITEETH_WRITER_EV_PENDING)) {
debug("liteeth: No packet ready\n");
return -EAGAIN;
}
rx_slot = litex_read8(priv->base + LITEETH_WRITER_SLOT);
len = litex_read32(priv->base + LITEETH_WRITER_LENGTH);
debug("%s: slot %d len 0x%x\n", __func__, rx_slot, len);
*packetp = priv->rx_base + rx_slot * priv->slot_size;
return len;
}
static int liteeth_free_pkt(struct udevice *dev, uchar *packet, int length)
{
struct liteeth *priv = dev_get_priv(dev);
litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1);
return 0;
}
static int liteeth_start(struct udevice *dev)
{
struct liteeth *priv = dev_get_priv(dev);
/* Clear pending events */
litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1);
litex_write8(priv->base + LITEETH_READER_EV_PENDING, 1);
/* Enable events */
litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 1);
litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 1);
return 0;
}
static void liteeth_stop(struct udevice *dev)
{
struct liteeth *priv = dev_get_priv(dev);
litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 0);
litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 0);
}
static int liteeth_send(struct udevice *dev, void *packet, int len)
{
struct liteeth *priv = dev_get_priv(dev);
void __iomem *txbuffer;
if (!litex_read8(priv->base + LITEETH_READER_READY)) {
printf("liteeth: reader not ready\n");
return -EAGAIN;
}
/* Reject oversize packets */
if (unlikely(len > priv->slot_size))
return -EMSGSIZE;
txbuffer = priv->tx_base + priv->tx_slot * priv->slot_size;
memcpy_toio(txbuffer, packet, len);
litex_write8(priv->base + LITEETH_READER_SLOT, priv->tx_slot);
litex_write16(priv->base + LITEETH_READER_LENGTH, len);
litex_write8(priv->base + LITEETH_READER_START, 1);
priv->tx_slot = (priv->tx_slot + 1) % priv->num_tx_slots;
return 0;
}
static void liteeth_setup_slots(struct liteeth *priv)
{
int err;
err = ofnode_read_u32(dev_ofnode(priv->dev), "litex,rx-slots", &priv->num_rx_slots);
if (err) {
dev_dbg(priv->dev, "unable to get litex,rx-slots, using 2\n");
priv->num_rx_slots = 2;
}
err = ofnode_read_u32(dev_ofnode(priv->dev), "litex,tx-slots", &priv->num_tx_slots);
if (err) {
dev_dbg(priv->dev, "unable to get litex,tx-slots, using 2\n");
priv->num_tx_slots = 2;
}
err = ofnode_read_u32(dev_ofnode(priv->dev), "litex,slot-size", &priv->slot_size);
if (err) {
dev_dbg(priv->dev, "unable to get litex,slot-size, using 0x800\n");
priv->slot_size = 0x800;
}
}
static int liteeth_remove(struct udevice *dev)
{
liteeth_stop(dev);
return 0;
}
static const struct eth_ops liteeth_ops = {
.start = liteeth_start,
.stop = liteeth_stop,
.send = liteeth_send,
.recv = liteeth_recv,
.free_pkt = liteeth_free_pkt,
};
static int liteeth_of_to_plat(struct udevice *dev)
{
struct eth_pdata *pdata = dev_get_plat(dev);
struct liteeth *priv = dev_get_priv(dev);
void __iomem *buf_base;
pdata->iobase = dev_read_addr(dev);
priv->dev = dev;
priv->base = dev_remap_addr_name(dev, "mac");
if (!priv->base) {
dev_err(dev, "failed to map registers\n");
return -EINVAL;
}
buf_base = dev_remap_addr_name(dev, "buffer");
if (!buf_base) {
dev_err(dev, "failed to map buffer\n");
return -EINVAL;
}
liteeth_setup_slots(priv);
/* Rx slots */
priv->rx_base = buf_base;
priv->rx_slot = 0;
/* Tx slots come after Rx slots */
priv->tx_base = buf_base + priv->num_rx_slots * priv->slot_size;
priv->tx_slot = 0;
return 0;
}
static const struct udevice_id liteeth_ids[] = {
{ .compatible = "litex,liteeth" },
{}
};
U_BOOT_DRIVER(liteeth) = {
.name = "liteeth",
.id = UCLASS_ETH,
.of_match = liteeth_ids,
.of_to_plat = liteeth_of_to_plat,
.plat_auto = sizeof(struct eth_pdata),
.remove = liteeth_remove,
.ops = &liteeth_ops,
.priv_auto = sizeof(struct liteeth),
};
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