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@@ -0,0 +1,179 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Copyright 2019-2021 NXP Semiconductors
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+ */
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+
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+#include <asm/eth.h>
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+#include <net/dsa.h>
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+#include <net.h>
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+
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+#define DSA_SANDBOX_MAGIC 0x00415344
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+#define DSA_SANDBOX_TAG_LEN sizeof(struct dsa_sandbox_tag)
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+
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+struct dsa_sandbox_priv {
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+ struct eth_sandbox_priv *master_priv;
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+ int port_en_mask;
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+};
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+
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+struct dsa_sandbox_tag {
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+ u32 magic;
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+ u32 port;
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+};
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+
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+static bool sb_dsa_port_enabled(struct udevice *dev, int port)
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+{
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+ struct dsa_sandbox_priv *priv = dev_get_priv(dev);
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+
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+ return priv->port_en_mask & BIT(port);
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+}
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+
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+static bool sb_dsa_master_enabled(struct udevice *dev)
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+{
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+ struct dsa_sandbox_priv *priv = dev_get_priv(dev);
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+
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+ return !priv->master_priv->disabled;
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+}
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+
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+static int dsa_sandbox_port_enable(struct udevice *dev, int port,
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+ struct phy_device *phy)
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+{
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+ struct dsa_sandbox_priv *priv = dev_get_priv(dev);
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+
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+ if (!sb_dsa_master_enabled(dev))
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+ return -EFAULT;
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+
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+ priv->port_en_mask |= BIT(port);
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+
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+ return 0;
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+}
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+
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+static void dsa_sandbox_port_disable(struct udevice *dev, int port,
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+ struct phy_device *phy)
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+{
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+ struct dsa_sandbox_priv *priv = dev_get_priv(dev);
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+
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+ priv->port_en_mask &= ~BIT(port);
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+}
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+
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+static int dsa_sandbox_xmit(struct udevice *dev, int port, void *packet,
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+ int length)
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+{
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+ struct dsa_sandbox_tag *tag = packet;
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+
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+ if (!sb_dsa_master_enabled(dev))
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+ return -EFAULT;
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+
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+ if (!sb_dsa_port_enabled(dev, port))
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+ return -EFAULT;
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+
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+ tag->magic = DSA_SANDBOX_MAGIC;
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+ tag->port = port;
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+
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+ return 0;
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+}
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+
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+static int dsa_sandbox_rcv(struct udevice *dev, int *port, void *packet,
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+ int length)
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+{
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+ struct dsa_sandbox_tag *tag = packet;
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+
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+ if (!sb_dsa_master_enabled(dev))
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+ return -EFAULT;
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+
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+ if (tag->magic != DSA_SANDBOX_MAGIC)
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+ return -EFAULT;
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+
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+ *port = tag->port;
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+ if (!sb_dsa_port_enabled(dev, tag->port))
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+ return -EFAULT;
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+
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+ return 0;
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+}
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+
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+static const struct dsa_ops dsa_sandbox_ops = {
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+ .port_enable = dsa_sandbox_port_enable,
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+ .port_disable = dsa_sandbox_port_disable,
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+ .xmit = dsa_sandbox_xmit,
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+ .rcv = dsa_sandbox_rcv,
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+};
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+
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+static int sb_dsa_handler(struct udevice *dev, void *packet,
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+ unsigned int len)
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+{
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+ struct eth_sandbox_priv *master_priv;
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+ struct dsa_sandbox_tag *tag = packet;
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+ struct udevice *dsa_dev;
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+ u32 port_index;
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+ void *rx_buf;
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+ int i;
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+
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+ /* this emulates the switch hw and the network side */
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+ if (tag->magic != DSA_SANDBOX_MAGIC)
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+ return -EFAULT;
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+
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+ port_index = tag->port;
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+ master_priv = dev_get_priv(dev);
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+ dsa_dev = master_priv->priv;
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+ if (!sb_dsa_port_enabled(dsa_dev, port_index))
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+ return -EFAULT;
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+
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+ packet += DSA_SANDBOX_TAG_LEN;
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+ len -= DSA_SANDBOX_TAG_LEN;
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+
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+ if (!sandbox_eth_arp_req_to_reply(dev, packet, len))
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+ goto dsa_tagging;
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+ if (!sandbox_eth_ping_req_to_reply(dev, packet, len))
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+ goto dsa_tagging;
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+
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+ return 0;
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+
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+dsa_tagging:
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+ master_priv->recv_packets--;
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+ i = master_priv->recv_packets;
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+ rx_buf = master_priv->recv_packet_buffer[i];
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+ len = master_priv->recv_packet_length[i];
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+ memmove(rx_buf + DSA_SANDBOX_TAG_LEN, rx_buf, len);
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+
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+ tag = rx_buf;
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+ tag->magic = DSA_SANDBOX_MAGIC;
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+ tag->port = port_index;
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+ len += DSA_SANDBOX_TAG_LEN;
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+ master_priv->recv_packet_length[i] = len;
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+ master_priv->recv_packets++;
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+
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+ return 0;
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+}
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+
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+static int dsa_sandbox_probe(struct udevice *dev)
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+{
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+ struct dsa_sandbox_priv *priv = dev_get_priv(dev);
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+ struct udevice *master = dsa_get_master(dev);
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+ struct eth_sandbox_priv *master_priv;
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+
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+ if (!master)
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+ return -ENODEV;
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+
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+ dsa_set_tagging(dev, DSA_SANDBOX_TAG_LEN, 0);
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+
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+ master_priv = dev_get_priv(master);
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+ master_priv->priv = dev;
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+ master_priv->tx_handler = sb_dsa_handler;
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+
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+ priv->master_priv = master_priv;
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+
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+ return 0;
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+}
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+
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+static const struct udevice_id dsa_sandbox_ids[] = {
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+ { .compatible = "sandbox,dsa" },
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+ { }
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+};
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+
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+U_BOOT_DRIVER(dsa_sandbox) = {
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+ .name = "dsa_sandbox",
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+ .id = UCLASS_DSA,
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+ .of_match = dsa_sandbox_ids,
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+ .probe = dsa_sandbox_probe,
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+ .ops = &dsa_sandbox_ops,
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+ .priv_auto = sizeof(struct dsa_sandbox_priv),
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+};
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