[PATCH 6/9] net: add LiteEth driver
Antony Pavlov
antonynpavlov at gmail.com
Wed May 5 03:08:57 PDT 2021
LiteEth provides a small footprint and configurable Ethernet core.
LiteEth is part of LiteX libraries whose aims are to lower entry level of
complex FPGA cores by providing simple, elegant and efficient implementations
of components used in today's SoC such as Ethernet, SATA, PCIe, SDRAM Controller...
Using Migen to describe the HDL allows the core to be highly and easily configurable.
LiteEth can be used as LiteX library or can be integrated with your standard
design flow by generating the verilog rtl that you will use as a standard core.
See https://github.com/enjoy-digital/liteeth for details.
Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
Signed-off-by: Marek Czerski <m.czerski at ap-tech.pl>
---
drivers/net/Kconfig | 8 +
drivers/net/Makefile | 1 +
drivers/net/liteeth.c | 376 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 385 insertions(+)
Cc: Marek Czerski <m.czerski at ap-tech.pl>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 0d55ea7a3b..4818f52603 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -271,6 +271,14 @@ config TSE_USE_DEDICATED_DESC_MEM
reserved with a malloc but directly mapped to the memory
address (defined in config.h)
+config DRIVER_NET_LITEETH
+ bool "LiteX ethernet driver"
+ select PHYLIB
+ select MDIO_BITBANG
+ help
+ This option enables support for the LiteX LiteEth
+ ethernet IP core.
+
source "drivers/net/phy/Kconfig"
source "drivers/net/usb/Kconfig"
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 656d45a868..bb751943f6 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -36,3 +36,4 @@ obj-$(CONFIG_DRIVER_NET_TAP) += tap.o
obj-$(CONFIG_DRIVER_NET_TSE) += altera_tse.o
obj-$(CONFIG_DRIVER_NET_EFI_SNP) += efi-snp.o
obj-$(CONFIG_DRIVER_NET_AG71XX) += ag71xx.o
+obj-$(CONFIG_DRIVER_NET_LITEETH) += liteeth.o
diff --git a/drivers/net/liteeth.c b/drivers/net/liteeth.c
new file mode 100644
index 0000000000..137cb854c5
--- /dev/null
+++ b/drivers/net/liteeth.c
@@ -0,0 +1,376 @@
+/*
+ * LiteX Liteeth Ethernet
+ *
+ * Copyright 2017 Joel Stanley <joel at jms.id.au>
+ *
+ * Ported to barebox from linux kernel
+ * Copyright (C) 2019-2021 Antony Pavlov <antonynpavlov at gmail.com>
+ * Copyright (C) 2021 Marek Czerski <m.czerski at ap-tech.pl>
+ *
+ */
+
+#include <common.h>
+#include <io.h>
+#include <linux/iopoll.h>
+#include <malloc.h>
+#include <net.h>
+#include <init.h>
+#include <of_net.h>
+#include <linux/phy.h>
+#include <linux/mdio-bitbang.h>
+
+#define DRV_NAME "liteeth"
+
+#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
+
+#define LITEETH_PHY_CRG_RESET 0x00
+#define LITEETH_MDIO_W 0x04
+#define MDIO_W_CLK BIT(0)
+#define MDIO_W_OE BIT(1)
+#define MDIO_W_DO BIT(2)
+
+#define LITEETH_MDIO_R 0x08
+#define MDIO_R_DI BIT(0)
+
+#define LITEETH_BUFFER_SIZE 0x800
+#define MAX_PKT_SIZE LITEETH_BUFFER_SIZE
+
+struct liteeth {
+ struct device_d *dev;
+ struct eth_device edev;
+ void __iomem *base;
+ void __iomem *mdio_base;
+ struct mii_bus *mii_bus;
+ struct mdiobb_ctrl mdiobb;
+
+ /* Link management */
+ int cur_duplex;
+ int cur_speed;
+
+ /* Tx */
+ int tx_slot;
+ int num_tx_slots;
+ void __iomem *tx_base;
+
+ /* Rx */
+ int rx_slot;
+ int num_rx_slots;
+ void __iomem *rx_base;
+};
+
+static inline void litex_write8(void __iomem *addr, u8 val)
+{
+ writeb(val, addr);
+}
+
+static inline void litex_write16(void __iomem *addr, u16 val)
+{
+ writew(val, addr);
+}
+
+static inline u8 litex_read8(void __iomem *addr)
+{
+ return readb(addr);
+}
+
+static inline u32 litex_read32(void __iomem *addr)
+{
+ return readl(addr);
+}
+
+static void liteeth_mdio_w_modify(struct liteeth *priv, u8 clear, u8 set)
+{
+ void __iomem *mdio_w = priv->mdio_base + LITEETH_MDIO_W;
+
+ litex_write8(mdio_w, (litex_read8(mdio_w) & ~clear) | set);
+}
+
+static void liteeth_mdio_ctrl(struct mdiobb_ctrl *ctrl, u8 mask, int set)
+{
+ struct liteeth *priv = container_of(ctrl, struct liteeth, mdiobb);
+
+ liteeth_mdio_w_modify(priv, mask, set ? mask : 0);
+}
+
+/* MDC pin control */
+static void liteeth_set_mdc(struct mdiobb_ctrl *ctrl, int level)
+{
+ liteeth_mdio_ctrl(ctrl, MDIO_W_CLK, level);
+}
+
+/* Data I/O pin control */
+static void liteeth_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output)
+{
+ liteeth_mdio_ctrl(ctrl, MDIO_W_OE, output);
+}
+
+/* Set data bit */
+static void liteeth_set_mdio_data(struct mdiobb_ctrl *ctrl, int value)
+{
+ liteeth_mdio_ctrl(ctrl, MDIO_W_DO, value);
+}
+
+/* Get data bit */
+static int liteeth_get_mdio_data(struct mdiobb_ctrl *ctrl)
+{
+ struct liteeth *priv = container_of(ctrl, struct liteeth, mdiobb);
+
+ return (litex_read8(priv->mdio_base + LITEETH_MDIO_R) & MDIO_R_DI) != 0;
+}
+
+/* MDIO bus control struct */
+static struct mdiobb_ops bb_ops = {
+ .set_mdc = liteeth_set_mdc,
+ .set_mdio_dir = liteeth_set_mdio_dir,
+ .set_mdio_data = liteeth_set_mdio_data,
+ .get_mdio_data = liteeth_get_mdio_data,
+};
+
+static int liteeth_init_dev(struct eth_device *edev)
+{
+ return 0;
+}
+
+static int liteeth_eth_open(struct eth_device *edev)
+{
+ struct liteeth *priv = edev->priv;
+ int ret;
+
+ /* Disable events */
+ litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 0);
+ litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 0);
+
+ /* Clear pending events? */
+ litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, 1);
+ litex_write8(priv->base + LITEETH_READER_EV_PENDING, 1);
+
+ ret = phy_device_connect(edev, priv->mii_bus, -1, NULL, 0, -1);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int liteeth_eth_send(struct eth_device *edev, void *packet,
+ int packet_length)
+{
+ struct liteeth *priv = edev->priv;
+ void *txbuffer;
+ int ret;
+ u8 val;
+ u8 reg;
+
+ reg = litex_read8(priv->base + LITEETH_READER_EV_PENDING);
+ if (reg) {
+ litex_write8(priv->base + LITEETH_READER_EV_PENDING, reg);
+ }
+
+ /* Reject oversize packets */
+ if (unlikely(packet_length > MAX_PKT_SIZE)) {
+ dev_err(priv->dev, "tx packet too big\n");
+ goto drop;
+ }
+
+ txbuffer = priv->tx_base + priv->tx_slot * LITEETH_BUFFER_SIZE;
+ memcpy(txbuffer, packet, packet_length);
+ litex_write8(priv->base + LITEETH_READER_SLOT, priv->tx_slot);
+ litex_write16(priv->base + LITEETH_READER_LENGTH, packet_length);
+
+ ret = readb_poll_timeout(priv->base + LITEETH_READER_READY,
+ val, val, 1000);
+ if (ret == -ETIMEDOUT) {
+ dev_err(priv->dev, "LITEETH_READER_READY timed out\n");
+ goto drop;
+ }
+
+ litex_write8(priv->base + LITEETH_READER_START, 1);
+
+ priv->tx_slot = (priv->tx_slot + 1) % priv->num_tx_slots;
+
+drop:
+ return 0;
+}
+
+static int liteeth_eth_rx(struct eth_device *edev)
+{
+ struct liteeth *priv = edev->priv;
+ u8 rx_slot;
+ int len = 0;
+ u8 reg;
+
+ reg = litex_read8(priv->base + LITEETH_WRITER_EV_PENDING);
+ if (!reg) {
+ goto done;
+ }
+
+ len = litex_read32(priv->base + LITEETH_WRITER_LENGTH);
+ if (len == 0 || len > 2048) {
+ len = 0;
+ dev_err(priv->dev, "%s: invalid len %d\n", __func__, len);
+ litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, reg);
+ goto done;
+ }
+
+ rx_slot = litex_read8(priv->base + LITEETH_WRITER_SLOT);
+
+ memcpy(NetRxPackets[0], priv->rx_base + rx_slot * LITEETH_BUFFER_SIZE, len);
+
+ net_receive(edev, NetRxPackets[0], len);
+
+ litex_write8(priv->base + LITEETH_WRITER_EV_PENDING, reg);
+
+done:
+ return len;
+}
+
+static void liteeth_eth_halt(struct eth_device *edev)
+{
+ struct liteeth *priv = edev->priv;
+
+ litex_write8(priv->base + LITEETH_WRITER_EV_ENABLE, 0);
+ litex_write8(priv->base + LITEETH_READER_EV_ENABLE, 0);
+}
+
+static void liteeth_reset_hw(struct liteeth *priv)
+{
+ /* Reset, twice */
+ litex_write8(priv->base + LITEETH_PHY_CRG_RESET, 0);
+ udelay(10);
+ litex_write8(priv->base + LITEETH_PHY_CRG_RESET, 1);
+ udelay(10);
+ litex_write8(priv->base + LITEETH_PHY_CRG_RESET, 0);
+ udelay(10);
+}
+
+static int liteeth_get_ethaddr(struct eth_device *edev, unsigned char *m)
+{
+ return 0;
+}
+
+static int liteeth_set_ethaddr(struct eth_device *edev,
+ const unsigned char *mac_addr)
+{
+ return 0;
+}
+
+static int liteeth_probe(struct device_d *dev)
+{
+ struct device_node *np = dev->device_node;
+ struct eth_device *edev;
+ void __iomem *buf_base;
+ struct liteeth *priv;
+ int err;
+
+ priv = xzalloc(sizeof(struct liteeth));
+ edev = &priv->edev;
+ edev->priv = priv;
+ priv->dev = dev;
+
+ priv->base = dev_request_mem_region(dev, 0);
+ if (IS_ERR(priv->base)) {
+ err = PTR_ERR(priv->base);
+ goto err;
+ }
+
+ priv->mdio_base = dev_request_mem_region(dev, 1);
+ if (IS_ERR(priv->mdio_base)) {
+ err = PTR_ERR(priv->mdio_base);
+ goto err;
+ }
+
+ buf_base = dev_request_mem_region(dev, 2);
+ if (IS_ERR(buf_base)) {
+ err = PTR_ERR(buf_base);
+ goto err;
+ }
+
+ err = of_property_read_u32(np, "rx-fifo-depth",
+ &priv->num_rx_slots);
+ if (err) {
+ dev_err(dev, "unable to get rx-fifo-depth\n");
+ goto err;
+ }
+
+ err = of_property_read_u32(np, "tx-fifo-depth",
+ &priv->num_tx_slots);
+ if (err) {
+ dev_err(dev, "unable to get tx-fifo-depth\n");
+ goto err;
+ }
+
+ /* 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 * LITEETH_BUFFER_SIZE;
+ priv->tx_slot = 0;
+
+ edev->init = liteeth_init_dev;
+ edev->open = liteeth_eth_open;
+ edev->send = liteeth_eth_send;
+ edev->recv = liteeth_eth_rx;
+ edev->get_ethaddr = liteeth_get_ethaddr;
+ edev->set_ethaddr = liteeth_set_ethaddr;
+ edev->halt = liteeth_eth_halt;
+ edev->parent = dev;
+
+ priv->mdiobb.ops = &bb_ops;
+
+ priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
+ priv->mii_bus->parent = dev;
+
+ liteeth_reset_hw(priv);
+
+ err = eth_register(edev);
+ if (err) {
+ dev_err(dev, "failed to register edev\n");
+ goto err;
+ }
+
+ err = mdiobus_register(priv->mii_bus);
+ if (err) {
+ dev_err(dev, "failed to register mii_bus\n");
+ goto err;
+ }
+
+ dev_info(dev, DRV_NAME " driver registered\n");
+
+ return 0;
+
+err:
+ return err;
+}
+
+static const struct of_device_id liteeth_dt_ids[] = {
+ {
+ .compatible = "litex,liteeth"
+ }, {
+ }
+};
+
+static struct driver_d liteeth_driver = {
+ .name = DRV_NAME,
+ .probe = liteeth_probe,
+ .of_compatible = DRV_OF_COMPAT(liteeth_dt_ids),
+};
+device_platform_driver(liteeth_driver);
+
+MODULE_AUTHOR("Joel Stanley <joel at jms.id.au>");
+MODULE_LICENSE("GPL");
--
2.31.1
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