net: xilinx: axi_emac: Add support for 10G/25G AXI ethernet

Add support for 10G/25G (XXV) high speed ethernet. This Makes use of
the exiting AXI DMA, similar to 1G.

Signed-off-by: Alessandro Temil <atemil@waymo.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/drivers/net/xilinx_axi_emac.c b/drivers/net/xilinx_axi_emac.c
index cfc6082..2ec76d0 100644 (file)
--- a/drivers/net/xilinx_axi_emac.c
+++ b/drivers/net/xilinx_axi_emac.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
+ * Copyright (C) 2021 Waymo LLC
  * Copyright (C) 2011 Michal Simek <monstr@monstr.eu>
  * Copyright (C) 2011 PetaLogix
  * Copyright (C) 2010 Xilinx, Inc. All rights reserved.
@@ -73,9 +74,22 @@ DECLARE_GLOBAL_DATA_PTR;
 #define XAXIDMA_BD_CTRL_TXSOF_MASK     0x08000000 /* First tx packet */
 #define XAXIDMA_BD_CTRL_TXEOF_MASK     0x04000000 /* Last tx packet */
 
-#define DMAALIGN       128
+/* Bitmasks for XXV Ethernet MAC */
+#define XXV_TC_TX_MASK         0x00000001
+#define XXV_TC_FCS_MASK                0x00000002
+#define XXV_RCW1_RX_MASK       0x00000001
+#define XXV_RCW1_FCS_MASK      0x00000002
+
+#define DMAALIGN               128
+#define XXV_MIN_PKT_SIZE       60
 
 static u8 rxframe[PKTSIZE_ALIGN] __attribute((aligned(DMAALIGN)));
+static u8 txminframe[XXV_MIN_PKT_SIZE] __attribute((aligned(DMAALIGN)));
+
+enum emac_variant {
+       EMAC_1G = 0,
+       EMAC_10G_25G = 1,
+};
 
 /* Reflect dma offsets */
 struct axidma_reg {
@@ -95,6 +109,7 @@ struct axidma_plat {
        int phyaddr;
        u8 eth_hasnobuf;
        int phy_of_handle;
+       enum emac_variant mactype;
 };
 
 /* Private driver structures */
@@ -108,6 +123,7 @@ struct axidma_priv {
        struct mii_dev *bus;
        u8 eth_hasnobuf;
        int phy_of_handle;
+       enum emac_variant mactype;
 };
 
 /* BD descriptors */
@@ -154,6 +170,14 @@ struct axi_regs {
        u32 uaw1; /* 0x704: Unicast address word 1 */
 };
 
+struct xxv_axi_regs {
+       u32 gt_reset;   /* 0x0 */
+       u32 reserved[2];
+       u32 tc;         /* 0xC: Tx Configuration */
+       u32 reserved2;
+       u32 rcw1;       /* 0x14: Rx Configuration Word 1 */
+};
+
 /* Use MII register 1 (MII status register) to detect PHY */
 #define PHY_DETECT_REG  1
 
@@ -385,6 +409,18 @@ static void axiemac_stop(struct udevice *dev)
        debug("axiemac: Halted\n");
 }
 
+static int xxv_axi_ethernet_init(struct axidma_priv *priv)
+{
+       struct xxv_axi_regs *regs = (struct xxv_axi_regs *)priv->iobase;
+
+       writel(readl(&regs->rcw1) | XXV_RCW1_FCS_MASK, &regs->rcw1);
+       writel(readl(&regs->tc) | XXV_TC_FCS_MASK, &regs->tc);
+       writel(readl(&regs->tc) | XXV_TC_TX_MASK, &regs->tc);
+       writel(readl(&regs->rcw1) | XXV_RCW1_RX_MASK, &regs->rcw1);
+
+       return 0;
+}
+
 static int axi_ethernet_init(struct axidma_priv *priv)
 {
        struct axi_regs *regs = priv->iobase;
@@ -440,6 +476,9 @@ static int axiemac_write_hwaddr(struct udevice *dev)
        struct axidma_priv *priv = dev_get_priv(dev);
        struct axi_regs *regs = priv->iobase;
 
+       if (priv->mactype != EMAC_1G)
+               return 0;
+
        /* Set the MAC address */
        int val = ((pdata->enetaddr[3] << 24) | (pdata->enetaddr[2] << 16) |
                (pdata->enetaddr[1] << 8) | (pdata->enetaddr[0]));
@@ -477,7 +516,6 @@ static void axi_dma_init(struct axidma_priv *priv)
 static int axiemac_start(struct udevice *dev)
 {
        struct axidma_priv *priv = dev_get_priv(dev);
-       struct axi_regs *regs = priv->iobase;
        u32 temp;
 
        debug("axiemac: Init started\n");
@@ -490,8 +528,13 @@ static int axiemac_start(struct udevice *dev)
        axi_dma_init(priv);
 
        /* Initialize AxiEthernet hardware. */
-       if (axi_ethernet_init(priv))
-               return -1;
+       if (priv->mactype == EMAC_1G) {
+               if (axi_ethernet_init(priv))
+                       return -1;
+       } else {
+               if (xxv_axi_ethernet_init(priv))
+                       return -1;
+       }
 
        /* Disable all RX interrupts before RxBD space setup */
        temp = readl(&priv->dmarx->control);
@@ -525,15 +568,25 @@ static int axiemac_start(struct udevice *dev)
        /* Rx BD is ready - start */
        axienet_dma_write(&rx_bd, &priv->dmarx->tail);
 
-       /* Enable TX */
-       writel(XAE_TC_TX_MASK, &regs->tc);
-       /* Enable RX */
-       writel(XAE_RCW1_RX_MASK, &regs->rcw1);
+       if (priv->mactype == EMAC_1G) {
+               struct axi_regs *regs = priv->iobase;
+               /* Enable TX */
+               writel(XAE_TC_TX_MASK, &regs->tc);
+               /* Enable RX */
+               writel(XAE_RCW1_RX_MASK, &regs->rcw1);
+
+               /* PHY setup */
+               if (!setup_phy(dev)) {
+                       axiemac_stop(dev);
+                       return -1;
+               }
+       } else {
+               struct xxv_axi_regs *regs = (struct xxv_axi_regs *)priv->iobase;
+               /* Enable TX */
+               writel(readl(&regs->tc) | XXV_TC_TX_MASK, &regs->tc);
 
-       /* PHY setup */
-       if (!setup_phy(dev)) {
-               axiemac_stop(dev);
-               return -1;
+               /* Enable RX */
+               writel(readl(&regs->rcw1) | XXV_RCW1_RX_MASK, &regs->rcw1);
        }
 
        debug("axiemac: Init complete\n");
@@ -548,6 +601,14 @@ static int axiemac_send(struct udevice *dev, void *ptr, int len)
        if (len > PKTSIZE_ALIGN)
                len = PKTSIZE_ALIGN;
 
+       /* If size is less than min packet size, pad to min size */
+       if (priv->mactype == EMAC_10G_25G && len < XXV_MIN_PKT_SIZE) {
+               memset(txminframe, 0, XXV_MIN_PKT_SIZE);
+               memcpy(txminframe, ptr, len);
+               len = XXV_MIN_PKT_SIZE;
+               ptr = txminframe;
+       }
+
        /* Flush packet to main memory to be trasfered by DMA */
        flush_cache((phys_addr_t)ptr, len);
 
@@ -632,7 +693,7 @@ static int axiemac_recv(struct udevice *dev, int flags, uchar **packetp)
        temp = readl(&priv->dmarx->control);
        temp &= ~XAXIDMA_IRQ_ALL_MASK;
        writel(temp, &priv->dmarx->control);
-       if (!priv->eth_hasnobuf)
+       if (!priv->eth_hasnobuf  && priv->mactype == EMAC_1G)
                length = rx_bd.app4 & 0xFFFF; /* max length mask */
        else
                length = rx_bd.status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK;
@@ -709,21 +770,25 @@ static int axi_emac_probe(struct udevice *dev)
        priv->dmatx = plat->dmatx;
        /* RX channel offset is 0x30 */
        priv->dmarx = (struct axidma_reg *)((phys_addr_t)priv->dmatx + 0x30);
-       priv->eth_hasnobuf = plat->eth_hasnobuf;
-       priv->phyaddr = plat->phyaddr;
-       priv->phy_of_handle = plat->phy_of_handle;
-       priv->interface = pdata->phy_interface;
+       priv->mactype = plat->mactype;
+
+       if (priv->mactype == EMAC_1G) {
+               priv->eth_hasnobuf = plat->eth_hasnobuf;
+               priv->phyaddr = plat->phyaddr;
+               priv->phy_of_handle = plat->phy_of_handle;
+               priv->interface = pdata->phy_interface;
 
-       priv->bus = mdio_alloc();
-       priv->bus->read = axiemac_miiphy_read;
-       priv->bus->write = axiemac_miiphy_write;
-       priv->bus->priv = priv;
+               priv->bus = mdio_alloc();
+               priv->bus->read = axiemac_miiphy_read;
+               priv->bus->write = axiemac_miiphy_write;
+               priv->bus->priv = priv;
 
-       ret = mdio_register_seq(priv->bus, dev_seq(dev));
-       if (ret)
-               return ret;
+               ret = mdio_register_seq(priv->bus, dev_seq(dev));
+               if (ret)
+                       return ret;
 
-       axiemac_phy_init(dev);
+               axiemac_phy_init(dev);
+       }
 
        return 0;
 }
@@ -732,9 +797,11 @@ static int axi_emac_remove(struct udevice *dev)
 {
        struct axidma_priv *priv = dev_get_priv(dev);
 
-       free(priv->phydev);
-       mdio_unregister(priv->bus);
-       mdio_free(priv->bus);
+       if (priv->mactype == EMAC_1G) {
+               free(priv->phydev);
+               mdio_unregister(priv->bus);
+               mdio_free(priv->bus);
+       }
 
        return 0;
 }
@@ -757,6 +824,7 @@ static int axi_emac_of_to_plat(struct udevice *dev)
        const char *phy_mode;
 
        pdata->iobase = dev_read_addr(dev);
+       plat->mactype = dev_get_driver_data(dev);
 
        offset = fdtdec_lookup_phandle(gd->fdt_blob, node,
                                       "axistream-connected");
@@ -771,24 +839,29 @@ static int axi_emac_of_to_plat(struct udevice *dev)
                return -EINVAL;
        }
 
-       plat->phyaddr = -1;
+       if (plat->mactype == EMAC_1G) {
+               plat->phyaddr = -1;
 
-       offset = fdtdec_lookup_phandle(gd->fdt_blob, node, "phy-handle");
-       if (offset > 0) {
-               plat->phyaddr = fdtdec_get_int(gd->fdt_blob, offset, "reg", -1);
-               plat->phy_of_handle = offset;
-       }
+               offset = fdtdec_lookup_phandle(gd->fdt_blob, node,
+                                              "phy-handle");
+               if (offset > 0) {
+                       plat->phyaddr = fdtdec_get_int(gd->fdt_blob, offset,
+                                                      "reg", -1);
+                       plat->phy_of_handle = offset;
+               }
 
-       phy_mode = fdt_getprop(gd->fdt_blob, node, "phy-mode", NULL);
-       if (phy_mode)
-               pdata->phy_interface = phy_get_interface_by_name(phy_mode);
-       if (pdata->phy_interface == -1) {
-               printf("%s: Invalid PHY interface '%s'\n", __func__, phy_mode);
-               return -EINVAL;
-       }
+               phy_mode = fdt_getprop(gd->fdt_blob, node, "phy-mode", NULL);
+               if (phy_mode)
+                       pdata->phy_interface = phy_get_interface_by_name(phy_mode);
+               if (pdata->phy_interface == -1) {
+                       printf("%s: Invalid PHY interface '%s'\n", __func__,
+                              phy_mode);
+                       return -EINVAL;
+               }
 
-       plat->eth_hasnobuf = fdtdec_get_bool(gd->fdt_blob, node,
-                                            "xlnx,eth-hasnobuf");
+               plat->eth_hasnobuf = fdtdec_get_bool(gd->fdt_blob, node,
+                                                    "xlnx,eth-hasnobuf");
+       }
 
        printf("AXI EMAC: %lx, phyaddr %d, interface %s\n", (ulong)pdata->iobase,
               plat->phyaddr, phy_string_for_interface(pdata->phy_interface));
@@ -797,7 +870,8 @@ static int axi_emac_of_to_plat(struct udevice *dev)
 }
 
 static const struct udevice_id axi_emac_ids[] = {
-       { .compatible = "xlnx,axi-ethernet-1.00.a" },
+       { .compatible = "xlnx,axi-ethernet-1.00.a", .data = (uintptr_t)EMAC_1G },
+       { .compatible = "xlnx,xxv-ethernet-1.0", .data = (uintptr_t)EMAC_10G_25G },
        { }
 };