// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2019 Amit Singh Tomar * * Driver for Broadcom GENETv5 Ethernet controller (as found on the RPi4) * This driver is based on the Linux driver: * drivers/net/ethernet/broadcom/genet/bcmgenet.c * which is: Copyright (c) 2014-2017 Broadcom * * The hardware supports multiple queues (16 priority queues and one * default queue), both for RX and TX. There are 256 DMA descriptors (both * for TX and RX), and they live in MMIO registers. The hardware allows * assigning descriptor ranges to queues, but we choose the most simple setup: * All 256 descriptors are assigned to the default queue (#16). * Also the Linux driver supports multiple generations of the MAC, whereas * we only support v5, as used in the Raspberry Pi 4. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Register definitions derived from Linux source */ #define SYS_REV_CTRL 0x00 #define SYS_PORT_CTRL 0x04 #define PORT_MODE_EXT_GPHY 3 #define GENET_SYS_OFF 0x0000 #define SYS_RBUF_FLUSH_CTRL (GENET_SYS_OFF + 0x08) #define SYS_TBUF_FLUSH_CTRL (GENET_SYS_OFF + 0x0c) #define GENET_EXT_OFF 0x0080 #define EXT_RGMII_OOB_CTRL (GENET_EXT_OFF + 0x0c) #define RGMII_LINK BIT(4) #define OOB_DISABLE BIT(5) #define RGMII_MODE_EN BIT(6) #define ID_MODE_DIS BIT(16) #define GENET_RBUF_OFF 0x0300 #define RBUF_TBUF_SIZE_CTRL (GENET_RBUF_OFF + 0xb4) #define RBUF_CTRL (GENET_RBUF_OFF + 0x00) #define RBUF_ALIGN_2B BIT(1) #define GENET_UMAC_OFF 0x0800 #define UMAC_MIB_CTRL (GENET_UMAC_OFF + 0x580) #define UMAC_MAX_FRAME_LEN (GENET_UMAC_OFF + 0x014) #define UMAC_MAC0 (GENET_UMAC_OFF + 0x00c) #define UMAC_MAC1 (GENET_UMAC_OFF + 0x010) #define UMAC_CMD (GENET_UMAC_OFF + 0x008) #define MDIO_CMD (GENET_UMAC_OFF + 0x614) #define UMAC_TX_FLUSH (GENET_UMAC_OFF + 0x334) #define MDIO_START_BUSY BIT(29) #define MDIO_READ_FAIL BIT(28) #define MDIO_RD (2 << 26) #define MDIO_WR BIT(26) #define MDIO_PMD_SHIFT 21 #define MDIO_PMD_MASK 0x1f #define MDIO_REG_SHIFT 16 #define MDIO_REG_MASK 0x1f #define CMD_TX_EN BIT(0) #define CMD_RX_EN BIT(1) #define UMAC_SPEED_10 0 #define UMAC_SPEED_100 1 #define UMAC_SPEED_1000 2 #define UMAC_SPEED_2500 3 #define CMD_SPEED_SHIFT 2 #define CMD_SPEED_MASK 3 #define CMD_SW_RESET BIT(13) #define CMD_LCL_LOOP_EN BIT(15) #define CMD_TX_EN BIT(0) #define CMD_RX_EN BIT(1) #define MIB_RESET_RX BIT(0) #define MIB_RESET_RUNT BIT(1) #define MIB_RESET_TX BIT(2) /* total number of Buffer Descriptors, same for Rx/Tx */ #define TOTAL_DESCS 256 #define RX_DESCS TOTAL_DESCS #define TX_DESCS TOTAL_DESCS #define DEFAULT_Q 0x10 /* Body(1500) + EH_SIZE(14) + VLANTAG(4) + BRCMTAG(6) + FCS(4) = 1528. * 1536 is multiple of 256 bytes */ #define ENET_BRCM_TAG_LEN 6 #define ENET_PAD 8 #define ENET_MAX_MTU_SIZE (ETH_DATA_LEN + ETH_HLEN + \ VLAN_HLEN + ENET_BRCM_TAG_LEN + \ ETH_FCS_LEN + ENET_PAD) /* Tx/Rx Dma Descriptor common bits */ #define DMA_EN BIT(0) #define DMA_RING_BUF_EN_SHIFT 0x01 #define DMA_RING_BUF_EN_MASK 0xffff #define DMA_BUFLENGTH_MASK 0x0fff #define DMA_BUFLENGTH_SHIFT 16 #define DMA_RING_SIZE_SHIFT 16 #define DMA_OWN 0x8000 #define DMA_EOP 0x4000 #define DMA_SOP 0x2000 #define DMA_WRAP 0x1000 #define DMA_MAX_BURST_LENGTH 0x8 /* Tx specific DMA descriptor bits */ #define DMA_TX_UNDERRUN 0x0200 #define DMA_TX_APPEND_CRC 0x0040 #define DMA_TX_OW_CRC 0x0020 #define DMA_TX_DO_CSUM 0x0010 #define DMA_TX_QTAG_SHIFT 7 /* DMA rings size */ #define DMA_RING_SIZE 0x40 #define DMA_RINGS_SIZE (DMA_RING_SIZE * (DEFAULT_Q + 1)) /* DMA descriptor */ #define DMA_DESC_LENGTH_STATUS 0x00 #define DMA_DESC_ADDRESS_LO 0x04 #define DMA_DESC_ADDRESS_HI 0x08 #define DMA_DESC_SIZE 12 #define GENET_RX_OFF 0x2000 #define GENET_RDMA_REG_OFF \ (GENET_RX_OFF + TOTAL_DESCS * DMA_DESC_SIZE) #define GENET_TX_OFF 0x4000 #define GENET_TDMA_REG_OFF \ (GENET_TX_OFF + TOTAL_DESCS * DMA_DESC_SIZE) #define DMA_FC_THRESH_HI (RX_DESCS >> 4) #define DMA_FC_THRESH_LO 5 #define DMA_FC_THRESH_VALUE ((DMA_FC_THRESH_LO << 16) | \ DMA_FC_THRESH_HI) #define DMA_XOFF_THRESHOLD_SHIFT 16 #define TDMA_RING_REG_BASE \ (GENET_TDMA_REG_OFF + DEFAULT_Q * DMA_RING_SIZE) #define TDMA_READ_PTR (TDMA_RING_REG_BASE + 0x00) #define TDMA_CONS_INDEX (TDMA_RING_REG_BASE + 0x08) #define TDMA_PROD_INDEX (TDMA_RING_REG_BASE + 0x0c) #define DMA_RING_BUF_SIZE 0x10 #define DMA_START_ADDR 0x14 #define DMA_END_ADDR 0x1c #define DMA_MBUF_DONE_THRESH 0x24 #define TDMA_FLOW_PERIOD (TDMA_RING_REG_BASE + 0x28) #define TDMA_WRITE_PTR (TDMA_RING_REG_BASE + 0x2c) #define RDMA_RING_REG_BASE \ (GENET_RDMA_REG_OFF + DEFAULT_Q * DMA_RING_SIZE) #define RDMA_WRITE_PTR (RDMA_RING_REG_BASE + 0x00) #define RDMA_PROD_INDEX (RDMA_RING_REG_BASE + 0x08) #define RDMA_CONS_INDEX (RDMA_RING_REG_BASE + 0x0c) #define RDMA_XON_XOFF_THRESH (RDMA_RING_REG_BASE + 0x28) #define RDMA_READ_PTR (RDMA_RING_REG_BASE + 0x2c) #define TDMA_REG_BASE (GENET_TDMA_REG_OFF + DMA_RINGS_SIZE) #define RDMA_REG_BASE (GENET_RDMA_REG_OFF + DMA_RINGS_SIZE) #define DMA_RING_CFG 0x00 #define DMA_CTRL 0x04 #define DMA_SCB_BURST_SIZE 0x0c #define RX_BUF_LENGTH 2048 #define RX_TOTAL_BUFSIZE (RX_BUF_LENGTH * RX_DESCS) #define RX_BUF_OFFSET 2 struct bcmgenet_eth_priv { char rxbuffer[RX_TOTAL_BUFSIZE] __aligned(ARCH_DMA_MINALIGN); void *mac_reg; void *tx_desc_base; void *rx_desc_base; int tx_index; int rx_index; int c_index; int phyaddr; u32 interface; u32 speed; struct phy_device *phydev; struct mii_dev *bus; }; static void bcmgenet_umac_reset(struct bcmgenet_eth_priv *priv) { u32 reg; reg = readl(priv->mac_reg + SYS_RBUF_FLUSH_CTRL); reg |= BIT(1); writel(reg, (priv->mac_reg + SYS_RBUF_FLUSH_CTRL)); udelay(10); reg &= ~BIT(1); writel(reg, (priv->mac_reg + SYS_RBUF_FLUSH_CTRL)); udelay(10); writel(0, (priv->mac_reg + SYS_RBUF_FLUSH_CTRL)); udelay(10); writel(0, priv->mac_reg + UMAC_CMD); writel(CMD_SW_RESET | CMD_LCL_LOOP_EN, priv->mac_reg + UMAC_CMD); udelay(2); writel(0, priv->mac_reg + UMAC_CMD); /* clear tx/rx counter */ writel(MIB_RESET_RX | MIB_RESET_TX | MIB_RESET_RUNT, priv->mac_reg + UMAC_MIB_CTRL); writel(0, priv->mac_reg + UMAC_MIB_CTRL); writel(ENET_MAX_MTU_SIZE, priv->mac_reg + UMAC_MAX_FRAME_LEN); /* init rx registers, enable ip header optimization */ reg = readl(priv->mac_reg + RBUF_CTRL); reg |= RBUF_ALIGN_2B; writel(reg, (priv->mac_reg + RBUF_CTRL)); writel(1, (priv->mac_reg + RBUF_TBUF_SIZE_CTRL)); } static int bcmgenet_gmac_write_hwaddr(struct udevice *dev) { struct bcmgenet_eth_priv *priv = dev_get_priv(dev); struct eth_pdata *pdata = dev_get_plat(dev); uchar *addr = pdata->enetaddr; u32 reg; reg = addr[0] << 24 | addr[1] << 16 | addr[2] << 8 | addr[3]; writel_relaxed(reg, priv->mac_reg + UMAC_MAC0); reg = addr[4] << 8 | addr[5]; writel_relaxed(reg, priv->mac_reg + UMAC_MAC1); return 0; } static void bcmgenet_disable_dma(struct bcmgenet_eth_priv *priv) { clrbits_32(priv->mac_reg + TDMA_REG_BASE + DMA_CTRL, DMA_EN); clrbits_32(priv->mac_reg + RDMA_REG_BASE + DMA_CTRL, DMA_EN); writel(1, priv->mac_reg + UMAC_TX_FLUSH); udelay(10); writel(0, priv->mac_reg + UMAC_TX_FLUSH); } static void bcmgenet_enable_dma(struct bcmgenet_eth_priv *priv) { u32 dma_ctrl = (1 << (DEFAULT_Q + DMA_RING_BUF_EN_SHIFT)) | DMA_EN; writel(dma_ctrl, priv->mac_reg + TDMA_REG_BASE + DMA_CTRL); setbits_32(priv->mac_reg + RDMA_REG_BASE + DMA_CTRL, dma_ctrl); } static int bcmgenet_gmac_eth_send(struct udevice *dev, void *packet, int length) { struct bcmgenet_eth_priv *priv = dev_get_priv(dev); void *desc_base = priv->tx_desc_base + priv->tx_index * DMA_DESC_SIZE; u32 len_stat = length << DMA_BUFLENGTH_SHIFT; ulong packet_aligned = rounddown((ulong)packet, ARCH_DMA_MINALIGN); u32 prod_index, cons; u32 tries = 100; prod_index = readl(priv->mac_reg + TDMA_PROD_INDEX); /* There is actually no reason for the rounding here, but the ARMv7 * implementation of flush_dcache_range() checks for aligned * boundaries of the flushed range. * Adjust them here to pass that check and avoid misleading messages. */ flush_dcache_range(packet_aligned, packet_aligned + roundup(length, ARCH_DMA_MINALIGN)); len_stat |= 0x3F << DMA_TX_QTAG_SHIFT; len_stat |= DMA_TX_APPEND_CRC | DMA_SOP | DMA_EOP; /* Set-up packet for transmission */ writel(lower_32_bits((ulong)packet), (desc_base + DMA_DESC_ADDRESS_LO)); writel(upper_32_bits((ulong)packet), (desc_base + DMA_DESC_ADDRESS_HI)); writel(len_stat, (desc_base + DMA_DESC_LENGTH_STATUS)); /* Increment index and start transmission */ if (++priv->tx_index >= TX_DESCS) priv->tx_index = 0; prod_index++; /* Start Transmisson */ writel(prod_index, priv->mac_reg + TDMA_PROD_INDEX); do { cons = readl(priv->mac_reg + TDMA_CONS_INDEX); } while ((cons & 0xffff) < prod_index && --tries); if (!tries) return -ETIMEDOUT; return 0; } /* Check whether all cache lines affected by an invalidate are within * the buffer, to make sure we don't accidentally lose unrelated dirty * data stored nearby. * Alignment of the buffer start address will be checked in the implementation * of invalidate_dcache_range(). */ static void invalidate_dcache_check(unsigned long addr, size_t size, size_t buffer_size) { size_t inval_size = roundup(size, ARCH_DMA_MINALIGN); if (unlikely(inval_size > buffer_size)) printf("WARNING: Cache invalidate area exceeds buffer size\n"); invalidate_dcache_range(addr, addr + inval_size); } static int bcmgenet_gmac_eth_recv(struct udevice *dev, int flags, uchar **packetp) { struct bcmgenet_eth_priv *priv = dev_get_priv(dev); void *desc_base = priv->rx_desc_base + priv->rx_index * DMA_DESC_SIZE; u32 prod_index = readl(priv->mac_reg + RDMA_PROD_INDEX); u32 length, addr; if (prod_index == priv->c_index) return -EAGAIN; length = readl(desc_base + DMA_DESC_LENGTH_STATUS); length = (length >> DMA_BUFLENGTH_SHIFT) & DMA_BUFLENGTH_MASK; addr = readl(desc_base + DMA_DESC_ADDRESS_LO); invalidate_dcache_check(addr, length, RX_BUF_LENGTH); /* To cater for the IP header alignment the hardware does. * This would actually not be needed if we don't program * RBUF_ALIGN_2B */ *packetp = (uchar *)(ulong)addr + RX_BUF_OFFSET; return length - RX_BUF_OFFSET; } static int bcmgenet_gmac_free_pkt(struct udevice *dev, uchar *packet, int length) { struct bcmgenet_eth_priv *priv = dev_get_priv(dev); /* Tell the MAC we have consumed that last receive buffer. */ priv->c_index = (priv->c_index + 1) & 0xFFFF; writel(priv->c_index, priv->mac_reg + RDMA_CONS_INDEX); /* Forward our descriptor pointer, wrapping around if needed. */ if (++priv->rx_index >= RX_DESCS) priv->rx_index = 0; return 0; } static void rx_descs_init(struct bcmgenet_eth_priv *priv) { char *rxbuffs = &priv->rxbuffer[0]; u32 len_stat, i; void *desc_base = priv->rx_desc_base; len_stat = (RX_BUF_LENGTH << DMA_BUFLENGTH_SHIFT) | DMA_OWN; for (i = 0; i < RX_DESCS; i++) { writel(lower_32_bits((uintptr_t)&rxbuffs[i * RX_BUF_LENGTH]), desc_base + i * DMA_DESC_SIZE + DMA_DESC_ADDRESS_LO); writel(upper_32_bits((uintptr_t)&rxbuffs[i * RX_BUF_LENGTH]), desc_base + i * DMA_DESC_SIZE + DMA_DESC_ADDRESS_HI); writel(len_stat, desc_base + i * DMA_DESC_SIZE + DMA_DESC_LENGTH_STATUS); } } static void rx_ring_init(struct bcmgenet_eth_priv *priv) { writel(DMA_MAX_BURST_LENGTH, priv->mac_reg + RDMA_REG_BASE + DMA_SCB_BURST_SIZE); writel(0x0, priv->mac_reg + RDMA_RING_REG_BASE + DMA_START_ADDR); writel(0x0, priv->mac_reg + RDMA_READ_PTR); writel(0x0, priv->mac_reg + RDMA_WRITE_PTR); writel(RX_DESCS * DMA_DESC_SIZE / 4 - 1, priv->mac_reg + RDMA_RING_REG_BASE + DMA_END_ADDR); /* cannot init RDMA_PROD_INDEX to 0, so align RDMA_CONS_INDEX on it instead */ priv->c_index = readl(priv->mac_reg + RDMA_PROD_INDEX); writel(priv->c_index, priv->mac_reg + RDMA_CONS_INDEX); priv->rx_index = priv->c_index; priv->rx_index &= 0xFF; writel((RX_DESCS << DMA_RING_SIZE_SHIFT) | RX_BUF_LENGTH, priv->mac_reg + RDMA_RING_REG_BASE + DMA_RING_BUF_SIZE); writel(DMA_FC_THRESH_VALUE, priv->mac_reg + RDMA_XON_XOFF_THRESH); writel(1 << DEFAULT_Q, priv->mac_reg + RDMA_REG_BASE + DMA_RING_CFG); } static void tx_ring_init(struct bcmgenet_eth_priv *priv) { writel(DMA_MAX_BURST_LENGTH, priv->mac_reg + TDMA_REG_BASE + DMA_SCB_BURST_SIZE); writel(0x0, priv->mac_reg + TDMA_RING_REG_BASE + DMA_START_ADDR); writel(0x0, priv->mac_reg + TDMA_READ_PTR); writel(0x0, priv->mac_reg + TDMA_WRITE_PTR); writel(TX_DESCS * DMA_DESC_SIZE / 4 - 1, priv->mac_reg + TDMA_RING_REG_BASE + DMA_END_ADDR); /* cannot init TDMA_CONS_INDEX to 0, so align TDMA_PROD_INDEX on it instead */ priv->tx_index = readl(priv->mac_reg + TDMA_CONS_INDEX); writel(priv->tx_index, priv->mac_reg + TDMA_PROD_INDEX); priv->tx_index &= 0xFF; writel(0x1, priv->mac_reg + TDMA_RING_REG_BASE + DMA_MBUF_DONE_THRESH); writel(0x0, priv->mac_reg + TDMA_FLOW_PERIOD); writel((TX_DESCS << DMA_RING_SIZE_SHIFT) | RX_BUF_LENGTH, priv->mac_reg + TDMA_RING_REG_BASE + DMA_RING_BUF_SIZE); writel(1 << DEFAULT_Q, priv->mac_reg + TDMA_REG_BASE + DMA_RING_CFG); } static int bcmgenet_adjust_link(struct bcmgenet_eth_priv *priv) { struct phy_device *phy_dev = priv->phydev; u32 speed; switch (phy_dev->speed) { case SPEED_1000: speed = UMAC_SPEED_1000; break; case SPEED_100: speed = UMAC_SPEED_100; break; case SPEED_10: speed = UMAC_SPEED_10; break; default: printf("bcmgenet: Unsupported PHY speed: %d\n", phy_dev->speed); return -EINVAL; } clrsetbits_32(priv->mac_reg + EXT_RGMII_OOB_CTRL, OOB_DISABLE, RGMII_LINK | RGMII_MODE_EN); if (phy_dev->interface == PHY_INTERFACE_MODE_RGMII || phy_dev->interface == PHY_INTERFACE_MODE_RGMII_RXID) setbits_32(priv->mac_reg + EXT_RGMII_OOB_CTRL, ID_MODE_DIS); writel(speed << CMD_SPEED_SHIFT, (priv->mac_reg + UMAC_CMD)); return 0; } static int bcmgenet_gmac_eth_start(struct udevice *dev) { struct bcmgenet_eth_priv *priv = dev_get_priv(dev); int ret; priv->tx_desc_base = priv->mac_reg + GENET_TX_OFF; priv->rx_desc_base = priv->mac_reg + GENET_RX_OFF; bcmgenet_umac_reset(priv); bcmgenet_gmac_write_hwaddr(dev); /* Disable RX/TX DMA and flush TX queues */ bcmgenet_disable_dma(priv); rx_ring_init(priv); rx_descs_init(priv); tx_ring_init(priv); /* Enable RX/TX DMA */ bcmgenet_enable_dma(priv); /* read PHY properties over the wire from generic PHY set-up */ ret = phy_startup(priv->phydev); if (ret) { printf("bcmgenet: PHY startup failed: %d\n", ret); return ret; } /* Update MAC registers based on PHY property */ ret = bcmgenet_adjust_link(priv); if (ret) { printf("bcmgenet: adjust PHY link failed: %d\n", ret); return ret; } /* Enable Rx/Tx */ setbits_32(priv->mac_reg + UMAC_CMD, CMD_TX_EN | CMD_RX_EN); return 0; } static int bcmgenet_phy_init(struct bcmgenet_eth_priv *priv, void *dev) { struct phy_device *phydev; int ret; phydev = phy_connect(priv->bus, priv->phyaddr, dev, priv->interface); if (!phydev) return -ENODEV; phydev->supported &= PHY_GBIT_FEATURES; if (priv->speed) { ret = phy_set_supported(priv->phydev, priv->speed); if (ret) return ret; } phydev->advertising = phydev->supported; phy_connect_dev(phydev, dev); priv->phydev = phydev; phy_config(priv->phydev); return 0; } static void bcmgenet_mdio_start(struct bcmgenet_eth_priv *priv) { setbits_32(priv->mac_reg + MDIO_CMD, MDIO_START_BUSY); } static int bcmgenet_mdio_write(struct mii_dev *bus, int addr, int devad, int reg, u16 value) { struct udevice *dev = bus->priv; struct bcmgenet_eth_priv *priv = dev_get_priv(dev); u32 val; /* Prepare the read operation */ val = MDIO_WR | (addr << MDIO_PMD_SHIFT) | (reg << MDIO_REG_SHIFT) | (0xffff & value); writel_relaxed(val, priv->mac_reg + MDIO_CMD); /* Start MDIO transaction */ bcmgenet_mdio_start(priv); return wait_for_bit_32(priv->mac_reg + MDIO_CMD, MDIO_START_BUSY, false, 20, true); } static int bcmgenet_mdio_read(struct mii_dev *bus, int addr, int devad, int reg) { struct udevice *dev = bus->priv; struct bcmgenet_eth_priv *priv = dev_get_priv(dev); u32 val; int ret; /* Prepare the read operation */ val = MDIO_RD | (addr << MDIO_PMD_SHIFT) | (reg << MDIO_REG_SHIFT); writel_relaxed(val, priv->mac_reg + MDIO_CMD); /* Start MDIO transaction */ bcmgenet_mdio_start(priv); ret = wait_for_bit_32(priv->mac_reg + MDIO_CMD, MDIO_START_BUSY, false, 20, true); if (ret) return ret; val = readl_relaxed(priv->mac_reg + MDIO_CMD); return val & 0xffff; } static int bcmgenet_mdio_init(const char *name, struct udevice *priv) { struct mii_dev *bus = mdio_alloc(); if (!bus) { debug("Failed to allocate MDIO bus\n"); return -ENOMEM; } bus->read = bcmgenet_mdio_read; bus->write = bcmgenet_mdio_write; snprintf(bus->name, sizeof(bus->name), name); bus->priv = (void *)priv; return mdio_register(bus); } /* We only support RGMII (as used on the RPi4). */ static int bcmgenet_interface_set(struct bcmgenet_eth_priv *priv) { phy_interface_t phy_mode = priv->interface; switch (phy_mode) { case PHY_INTERFACE_MODE_RGMII: case PHY_INTERFACE_MODE_RGMII_RXID: writel(PORT_MODE_EXT_GPHY, priv->mac_reg + SYS_PORT_CTRL); break; default: printf("unknown phy mode: %d\n", priv->interface); return -EINVAL; } return 0; } static int bcmgenet_eth_probe(struct udevice *dev) { struct eth_pdata *pdata = dev_get_plat(dev); struct bcmgenet_eth_priv *priv = dev_get_priv(dev); ofnode mdio_node; const char *name; u32 reg; int ret; u8 major; priv->mac_reg = map_physmem(pdata->iobase, SZ_64K, MAP_NOCACHE); priv->interface = pdata->phy_interface; priv->speed = pdata->max_speed; /* Read GENET HW version */ reg = readl_relaxed(priv->mac_reg + SYS_REV_CTRL); major = (reg >> 24) & 0x0f; if (major != 6) { if (major == 5) major = 4; else if (major == 0) major = 1; printf("Unsupported GENETv%d.%d\n", major, (reg >> 16) & 0x0f); return -ENODEV; } ret = bcmgenet_interface_set(priv); if (ret) return ret; writel(0, priv->mac_reg + SYS_RBUF_FLUSH_CTRL); udelay(10); /* disable MAC while updating its registers */ writel(0, priv->mac_reg + UMAC_CMD); /* issue soft reset with (rg)mii loopback to ensure a stable rxclk */ writel(CMD_SW_RESET | CMD_LCL_LOOP_EN, priv->mac_reg + UMAC_CMD); mdio_node = dev_read_first_subnode(dev); name = ofnode_get_name(mdio_node); ret = bcmgenet_mdio_init(name, dev); if (ret) return ret; priv->bus = miiphy_get_dev_by_name(name); return bcmgenet_phy_init(priv, dev); } static void bcmgenet_gmac_eth_stop(struct udevice *dev) { struct bcmgenet_eth_priv *priv = dev_get_priv(dev); clrbits_32(priv->mac_reg + UMAC_CMD, CMD_TX_EN | CMD_RX_EN); bcmgenet_disable_dma(priv); } static const struct eth_ops bcmgenet_gmac_eth_ops = { .start = bcmgenet_gmac_eth_start, .write_hwaddr = bcmgenet_gmac_write_hwaddr, .send = bcmgenet_gmac_eth_send, .recv = bcmgenet_gmac_eth_recv, .free_pkt = bcmgenet_gmac_free_pkt, .stop = bcmgenet_gmac_eth_stop, }; static int bcmgenet_eth_of_to_plat(struct udevice *dev) { struct eth_pdata *pdata = dev_get_plat(dev); struct bcmgenet_eth_priv *priv = dev_get_priv(dev); struct ofnode_phandle_args phy_node; int ret; pdata->iobase = dev_read_addr(dev); /* Get phy mode from DT */ pdata->phy_interface = dev_read_phy_mode(dev); if (pdata->phy_interface == PHY_INTERFACE_MODE_NA) return -EINVAL; ret = dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0, &phy_node); if (!ret) { ofnode_read_s32(phy_node.node, "reg", &priv->phyaddr); ofnode_read_s32(phy_node.node, "max-speed", &pdata->max_speed); } return 0; } /* The BCM2711 implementation has a limited burst length compared to a generic * GENETv5 version, but we go with that shorter value (8) in both cases, for * the sake of simplicity. */ static const struct udevice_id bcmgenet_eth_ids[] = { {.compatible = "brcm,genet-v5"}, {.compatible = "brcm,bcm2711-genet-v5"}, {} }; U_BOOT_DRIVER(eth_bcmgenet) = { .name = "eth_bcmgenet", .id = UCLASS_ETH, .of_match = bcmgenet_eth_ids, .of_to_plat = bcmgenet_eth_of_to_plat, .probe = bcmgenet_eth_probe, .ops = &bcmgenet_gmac_eth_ops, .priv_auto = sizeof(struct bcmgenet_eth_priv), .plat_auto = sizeof(struct eth_pdata), .flags = DM_FLAG_ALLOC_PRIV_DMA, };