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https://github.com/AsahiLinux/u-boot
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3167b4d722
LiteX is a soft system-on-chip that targets FPGAs. LiteETH is a basic network device that is commonly used in LiteX designs. Signed-off-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
214 lines
5 KiB
C
214 lines
5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* LiteX Liteeth Ethernet
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*
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* Copyright 2021 Joel Stanley <joel@jms.id.au>, IBM Corp.
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*/
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#include <linux/litex.h>
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <net.h>
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#define LITEETH_WRITER_SLOT 0x00
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#define LITEETH_WRITER_LENGTH 0x04
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#define LITEETH_WRITER_ERRORS 0x08
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#define LITEETH_WRITER_EV_STATUS 0x0C
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#define LITEETH_WRITER_EV_PENDING 0x10
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#define LITEETH_WRITER_EV_ENABLE 0x14
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#define LITEETH_READER_START 0x18
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#define LITEETH_READER_READY 0x1C
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#define LITEETH_READER_LEVEL 0x20
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#define LITEETH_READER_SLOT 0x24
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#define LITEETH_READER_LENGTH 0x28
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#define LITEETH_READER_EV_STATUS 0x2C
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#define LITEETH_READER_EV_PENDING 0x30
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#define LITEETH_READER_EV_ENABLE 0x34
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#define LITEETH_PREAMBLE_CRC 0x38
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#define LITEETH_PREAMBLE_ERRORS 0x3C
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#define LITEETH_CRC_ERRORS 0x40
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struct liteeth {
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struct udevice *dev;
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void __iomem *base;
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u32 slot_size;
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/* Tx */
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u32 tx_slot;
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u32 num_tx_slots;
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void __iomem *tx_base;
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/* Rx */
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u32 rx_slot;
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u32 num_rx_slots;
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void __iomem *rx_base;
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};
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static int liteeth_recv(struct udevice *dev, int flags, uchar **packetp)
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{
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struct liteeth *priv = dev_get_priv(dev);
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u8 rx_slot;
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int len;
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if (!litex_read8(priv->base + LITEETH_WRITER_EV_PENDING)) {
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debug("liteeth: No packet ready\n");
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return -EAGAIN;
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}
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rx_slot = litex_read8(priv->base + LITEETH_WRITER_SLOT);
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len = litex_read32(priv->base + LITEETH_WRITER_LENGTH);
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debug("%s: slot %d len 0x%x\n", __func__, rx_slot, len);
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*packetp = priv->rx_base + rx_slot * priv->slot_size;
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return len;
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}
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static int liteeth_free_pkt(struct udevice *dev, uchar *packet, int length)
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{
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struct liteeth *priv = dev_get_priv(dev);
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litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1);
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return 0;
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}
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static int liteeth_start(struct udevice *dev)
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{
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struct liteeth *priv = dev_get_priv(dev);
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/* Clear pending events */
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litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1);
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litex_write8(priv->base + LITEETH_READER_EV_PENDING, 1);
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/* Enable events */
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litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 1);
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litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 1);
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return 0;
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}
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static void liteeth_stop(struct udevice *dev)
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{
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struct liteeth *priv = dev_get_priv(dev);
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litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 0);
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litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 0);
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}
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static int liteeth_send(struct udevice *dev, void *packet, int len)
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{
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struct liteeth *priv = dev_get_priv(dev);
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void __iomem *txbuffer;
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if (!litex_read8(priv->base + LITEETH_READER_READY)) {
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printf("liteeth: reader not ready\n");
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return -EAGAIN;
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}
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/* Reject oversize packets */
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if (unlikely(len > priv->slot_size))
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return -EMSGSIZE;
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txbuffer = priv->tx_base + priv->tx_slot * priv->slot_size;
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memcpy_toio(txbuffer, packet, len);
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litex_write8(priv->base + LITEETH_READER_SLOT, priv->tx_slot);
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litex_write16(priv->base + LITEETH_READER_LENGTH, len);
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litex_write8(priv->base + LITEETH_READER_START, 1);
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priv->tx_slot = (priv->tx_slot + 1) % priv->num_tx_slots;
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return 0;
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}
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static void liteeth_setup_slots(struct liteeth *priv)
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{
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int err;
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err = ofnode_read_u32(dev_ofnode(priv->dev), "litex,rx-slots", &priv->num_rx_slots);
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if (err) {
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dev_dbg(priv->dev, "unable to get litex,rx-slots, using 2\n");
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priv->num_rx_slots = 2;
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}
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err = ofnode_read_u32(dev_ofnode(priv->dev), "litex,tx-slots", &priv->num_tx_slots);
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if (err) {
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dev_dbg(priv->dev, "unable to get litex,tx-slots, using 2\n");
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priv->num_tx_slots = 2;
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}
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err = ofnode_read_u32(dev_ofnode(priv->dev), "litex,slot-size", &priv->slot_size);
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if (err) {
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dev_dbg(priv->dev, "unable to get litex,slot-size, using 0x800\n");
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priv->slot_size = 0x800;
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}
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}
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static int liteeth_remove(struct udevice *dev)
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{
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liteeth_stop(dev);
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return 0;
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}
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static const struct eth_ops liteeth_ops = {
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.start = liteeth_start,
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.stop = liteeth_stop,
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.send = liteeth_send,
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.recv = liteeth_recv,
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.free_pkt = liteeth_free_pkt,
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};
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static int liteeth_of_to_plat(struct udevice *dev)
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{
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struct eth_pdata *pdata = dev_get_plat(dev);
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struct liteeth *priv = dev_get_priv(dev);
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void __iomem *buf_base;
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pdata->iobase = dev_read_addr(dev);
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priv->dev = dev;
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priv->base = dev_remap_addr_name(dev, "mac");
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if (!priv->base) {
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dev_err(dev, "failed to map registers\n");
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return -EINVAL;
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}
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buf_base = dev_remap_addr_name(dev, "buffer");
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if (!buf_base) {
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dev_err(dev, "failed to map buffer\n");
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return -EINVAL;
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}
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liteeth_setup_slots(priv);
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/* Rx slots */
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priv->rx_base = buf_base;
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priv->rx_slot = 0;
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/* Tx slots come after Rx slots */
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priv->tx_base = buf_base + priv->num_rx_slots * priv->slot_size;
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priv->tx_slot = 0;
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return 0;
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}
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static const struct udevice_id liteeth_ids[] = {
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{ .compatible = "litex,liteeth" },
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{}
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};
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U_BOOT_DRIVER(liteeth) = {
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.name = "liteeth",
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.id = UCLASS_ETH,
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.of_match = liteeth_ids,
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.of_to_plat = liteeth_of_to_plat,
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.plat_auto = sizeof(struct eth_pdata),
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.remove = liteeth_remove,
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.ops = &liteeth_ops,
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.priv_auto = sizeof(struct liteeth),
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};
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