diff options
| -rw-r--r-- | drivers/net/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/net/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/bcmgenet.c | 729 |
3 files changed, 737 insertions, 0 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 01d087f229..4d1013c984 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -136,6 +136,13 @@ config BCM6368_ETH help This driver supports the BCM6368 Ethernet MAC. +config BCMGENET + bool "BCMGENET V5 support" + depends on DM_ETH + select PHYLIB + help + This driver supports the BCMGENET Ethernet MAC. + config DWC_ETH_QOS bool "Synopsys DWC Ethernet QOS device support" depends on DM_ETH diff --git a/drivers/net/Makefile b/drivers/net/Makefile index 30991834ec..6e0a68834d 100644 --- a/drivers/net/Makefile +++ b/drivers/net/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_AG7XXX) += ag7xxx.o obj-$(CONFIG_ARMADA100_FEC) += armada100_fec.o obj-$(CONFIG_BCM6348_ETH) += bcm6348-eth.o obj-$(CONFIG_BCM6368_ETH) += bcm6368-eth.o +obj-$(CONFIG_BCMGENET) += bcmgenet.o obj-$(CONFIG_DRIVER_AT91EMAC) += at91_emac.o obj-$(CONFIG_DRIVER_AX88180) += ax88180.o obj-$(CONFIG_BCM_SF2_ETH) += bcm-sf2-eth.o diff --git a/drivers/net/bcmgenet.c b/drivers/net/bcmgenet.c new file mode 100644 index 0000000000..8f4848aec6 --- /dev/null +++ b/drivers/net/bcmgenet.c @@ -0,0 +1,729 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Amit Singh Tomar <amittomer25@gmail.com> + * + * 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 <asm/io.h> +#include <clk.h> +#include <cpu_func.h> +#include <dm.h> +#include <fdt_support.h> +#include <linux/err.h> +#include <malloc.h> +#include <miiphy.h> +#include <net.h> +#include <dm/of_access.h> +#include <dm/ofnode.h> +#include <linux/iopoll.h> +#include <linux/sizes.h> +#include <asm/dma-mapping.h> +#include <wait_bit.h> + +/* 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_platdata(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; + + priv->c_index = 0; + + 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); + + writel(0x0, priv->mac_reg + RDMA_PROD_INDEX); + writel(0x0, priv->mac_reg + RDMA_CONS_INDEX); + 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); + writel(0x0, priv->mac_reg + TDMA_PROD_INDEX); + writel(0x0, priv->mac_reg + TDMA_CONS_INDEX); + 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 | 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; + priv->tx_index = 0x0; + priv->rx_index = 0x0; + + 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_platdata(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_ofdata_to_platdata(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct bcmgenet_eth_priv *priv = dev_get_priv(dev); + struct ofnode_phandle_args phy_node; + const char *phy_mode; + int ret; + + pdata->iobase = dev_read_addr(dev); + + /* Get phy mode from DT */ + pdata->phy_interface = -1; + phy_mode = dev_read_string(dev, "phy-mode"); + if (phy_mode) + pdata->phy_interface = phy_get_interface_by_name(phy_mode); + if (pdata->phy_interface == -1) { + debug("%s: Invalid PHY interface '%s'\n", __func__, phy_mode); + 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, + .ofdata_to_platdata = bcmgenet_eth_ofdata_to_platdata, + .probe = bcmgenet_eth_probe, + .ops = &bcmgenet_gmac_eth_ops, + .priv_auto_alloc_size = sizeof(struct bcmgenet_eth_priv), + .platdata_auto_alloc_size = sizeof(struct eth_pdata), + .flags = DM_FLAG_ALLOC_PRIV_DMA, +}; |