diff options
Diffstat (limited to 'drivers/net/bcm6348-eth.c')
| -rw-r--r-- | drivers/net/bcm6348-eth.c | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/drivers/net/bcm6348-eth.c b/drivers/net/bcm6348-eth.c new file mode 100644 index 0000000000..7100e68bd2 --- /dev/null +++ b/drivers/net/bcm6348-eth.c @@ -0,0 +1,537 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com> + * + * Derived from linux/drivers/net/ethernet/broadcom/bcm63xx_enet.c: + * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr> + */ + +#include <common.h> +#include <clk.h> +#include <dm.h> +#include <dma.h> +#include <miiphy.h> +#include <net.h> +#include <phy.h> +#include <reset.h> +#include <wait_bit.h> +#include <asm/io.h> + +#define ETH_RX_DESC PKTBUFSRX +#define ETH_MAX_MTU_SIZE 1518 +#define ETH_TIMEOUT 100 +#define ETH_TX_WATERMARK 32 + +/* ETH Receiver Configuration register */ +#define ETH_RXCFG_REG 0x00 +#define ETH_RXCFG_ENFLOW_SHIFT 5 +#define ETH_RXCFG_ENFLOW_MASK (1 << ETH_RXCFG_ENFLOW_SHIFT) + +/* ETH Receive Maximum Length register */ +#define ETH_RXMAXLEN_REG 0x04 +#define ETH_RXMAXLEN_SHIFT 0 +#define ETH_RXMAXLEN_MASK (0x7ff << ETH_RXMAXLEN_SHIFT) + +/* ETH Transmit Maximum Length register */ +#define ETH_TXMAXLEN_REG 0x08 +#define ETH_TXMAXLEN_SHIFT 0 +#define ETH_TXMAXLEN_MASK (0x7ff << ETH_TXMAXLEN_SHIFT) + +/* MII Status/Control register */ +#define MII_SC_REG 0x10 +#define MII_SC_MDCFREQDIV_SHIFT 0 +#define MII_SC_MDCFREQDIV_MASK (0x7f << MII_SC_MDCFREQDIV_SHIFT) +#define MII_SC_PREAMBLE_EN_SHIFT 7 +#define MII_SC_PREAMBLE_EN_MASK (1 << MII_SC_PREAMBLE_EN_SHIFT) + +/* MII Data register */ +#define MII_DAT_REG 0x14 +#define MII_DAT_DATA_SHIFT 0 +#define MII_DAT_DATA_MASK (0xffff << MII_DAT_DATA_SHIFT) +#define MII_DAT_TA_SHIFT 16 +#define MII_DAT_TA_MASK (0x3 << MII_DAT_TA_SHIFT) +#define MII_DAT_REG_SHIFT 18 +#define MII_DAT_REG_MASK (0x1f << MII_DAT_REG_SHIFT) +#define MII_DAT_PHY_SHIFT 23 +#define MII_DAT_PHY_MASK (0x1f << MII_DAT_PHY_SHIFT) +#define MII_DAT_OP_SHIFT 28 +#define MII_DAT_OP_WRITE (0x5 << MII_DAT_OP_SHIFT) +#define MII_DAT_OP_READ (0x6 << MII_DAT_OP_SHIFT) + +/* ETH Interrupts Mask register */ +#define ETH_IRMASK_REG 0x18 + +/* ETH Interrupts register */ +#define ETH_IR_REG 0x1c +#define ETH_IR_MII_SHIFT 0 +#define ETH_IR_MII_MASK (1 << ETH_IR_MII_SHIFT) + +/* ETH Control register */ +#define ETH_CTL_REG 0x2c +#define ETH_CTL_ENABLE_SHIFT 0 +#define ETH_CTL_ENABLE_MASK (1 << ETH_CTL_ENABLE_SHIFT) +#define ETH_CTL_DISABLE_SHIFT 1 +#define ETH_CTL_DISABLE_MASK (1 << ETH_CTL_DISABLE_SHIFT) +#define ETH_CTL_RESET_SHIFT 2 +#define ETH_CTL_RESET_MASK (1 << ETH_CTL_RESET_SHIFT) +#define ETH_CTL_EPHY_SHIFT 3 +#define ETH_CTL_EPHY_MASK (1 << ETH_CTL_EPHY_SHIFT) + +/* ETH Transmit Control register */ +#define ETH_TXCTL_REG 0x30 +#define ETH_TXCTL_FD_SHIFT 0 +#define ETH_TXCTL_FD_MASK (1 << ETH_TXCTL_FD_SHIFT) + +/* ETH Transmit Watermask register */ +#define ETH_TXWMARK_REG 0x34 +#define ETH_TXWMARK_WM_SHIFT 0 +#define ETH_TXWMARK_WM_MASK (0x3f << ETH_TXWMARK_WM_SHIFT) + +/* MIB Control register */ +#define MIB_CTL_REG 0x38 +#define MIB_CTL_RDCLEAR_SHIFT 0 +#define MIB_CTL_RDCLEAR_MASK (1 << MIB_CTL_RDCLEAR_SHIFT) + +/* ETH Perfect Match registers */ +#define ETH_PM_CNT 4 +#define ETH_PML_REG(x) (0x58 + (x) * 0x8) +#define ETH_PMH_REG(x) (0x5c + (x) * 0x8) +#define ETH_PMH_VALID_SHIFT 16 +#define ETH_PMH_VALID_MASK (1 << ETH_PMH_VALID_SHIFT) + +/* MIB Counters registers */ +#define MIB_REG_CNT 55 +#define MIB_REG(x) (0x200 + (x) * 4) + +/* ETH data */ +struct bcm6348_eth_priv { + void __iomem *base; + /* DMA */ + struct dma rx_dma; + struct dma tx_dma; + /* PHY */ + int phy_id; + struct phy_device *phy_dev; +}; + +static void bcm6348_eth_mac_disable(struct bcm6348_eth_priv *priv) +{ + /* disable emac */ + clrsetbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_ENABLE_MASK, + ETH_CTL_DISABLE_MASK); + + /* wait until emac is disabled */ + if (wait_for_bit_be32(priv->base + ETH_CTL_REG, + ETH_CTL_DISABLE_MASK, false, + ETH_TIMEOUT, false)) + pr_err("%s: error disabling emac\n", __func__); +} + +static void bcm6348_eth_mac_enable(struct bcm6348_eth_priv *priv) +{ + setbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_ENABLE_MASK); +} + +static void bcm6348_eth_mac_reset(struct bcm6348_eth_priv *priv) +{ + /* reset emac */ + writel_be(ETH_CTL_RESET_MASK, priv->base + ETH_CTL_REG); + wmb(); + + /* wait until emac is reset */ + if (wait_for_bit_be32(priv->base + ETH_CTL_REG, + ETH_CTL_RESET_MASK, false, + ETH_TIMEOUT, false)) + pr_err("%s: error resetting emac\n", __func__); +} + +static int bcm6348_eth_free_pkt(struct udevice *dev, uchar *packet, int len) +{ + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + + return dma_prepare_rcv_buf(&priv->rx_dma, packet, len); +} + +static int bcm6348_eth_recv(struct udevice *dev, int flags, uchar **packetp) +{ + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + + return dma_receive(&priv->rx_dma, (void**)packetp, NULL); +} + +static int bcm6348_eth_send(struct udevice *dev, void *packet, int length) +{ + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + + return dma_send(&priv->tx_dma, packet, length, NULL); +} + +static int bcm6348_eth_adjust_link(struct udevice *dev, + struct phy_device *phydev) +{ + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + + /* mac duplex parameters */ + if (phydev->duplex) + setbits_be32(priv->base + ETH_TXCTL_REG, ETH_TXCTL_FD_MASK); + else + clrbits_be32(priv->base + ETH_TXCTL_REG, ETH_TXCTL_FD_MASK); + + /* rx flow control (pause frame handling) */ + if (phydev->pause) + setbits_be32(priv->base + ETH_RXCFG_REG, + ETH_RXCFG_ENFLOW_MASK); + else + clrbits_be32(priv->base + ETH_RXCFG_REG, + ETH_RXCFG_ENFLOW_MASK); + + return 0; +} + +static int bcm6348_eth_start(struct udevice *dev) +{ + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + int ret, i; + + /* prepare rx dma buffers */ + for (i = 0; i < ETH_RX_DESC; i++) { + ret = dma_prepare_rcv_buf(&priv->rx_dma, net_rx_packets[i], + PKTSIZE_ALIGN); + if (ret < 0) + break; + } + + /* enable dma rx channel */ + dma_enable(&priv->rx_dma); + + /* enable dma tx channel */ + dma_enable(&priv->tx_dma); + + ret = phy_startup(priv->phy_dev); + if (ret) { + pr_err("%s: could not initialize phy\n", __func__); + return ret; + } + + if (!priv->phy_dev->link) { + pr_err("%s: no phy link\n", __func__); + return -EIO; + } + + bcm6348_eth_adjust_link(dev, priv->phy_dev); + + /* zero mib counters */ + for (i = 0; i < MIB_REG_CNT; i++) + writel_be(0, MIB_REG(i)); + + /* enable rx flow control */ + setbits_be32(priv->base + ETH_RXCFG_REG, ETH_RXCFG_ENFLOW_MASK); + + /* set max rx/tx length */ + writel_be((ETH_MAX_MTU_SIZE << ETH_RXMAXLEN_SHIFT) & + ETH_RXMAXLEN_MASK, priv->base + ETH_RXMAXLEN_REG); + writel_be((ETH_MAX_MTU_SIZE << ETH_TXMAXLEN_SHIFT) & + ETH_TXMAXLEN_MASK, priv->base + ETH_TXMAXLEN_REG); + + /* set correct transmit fifo watermark */ + writel_be((ETH_TX_WATERMARK << ETH_TXWMARK_WM_SHIFT) & + ETH_TXWMARK_WM_MASK, priv->base + ETH_TXWMARK_REG); + + /* enable emac */ + bcm6348_eth_mac_enable(priv); + + /* clear interrupts */ + writel_be(0, priv->base + ETH_IRMASK_REG); + + return 0; +} + +static void bcm6348_eth_stop(struct udevice *dev) +{ + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + + /* disable dma rx channel */ + dma_disable(&priv->rx_dma); + + /* disable dma tx channel */ + dma_disable(&priv->tx_dma); + + /* disable emac */ + bcm6348_eth_mac_disable(priv); +} + +static int bcm6348_eth_write_hwaddr(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + bool running = false; + + /* check if emac is running */ + if (readl_be(priv->base + ETH_CTL_REG) & ETH_CTL_ENABLE_MASK) + running = true; + + /* disable emac */ + if (running) + bcm6348_eth_mac_disable(priv); + + /* set mac address */ + writel_be((pdata->enetaddr[2] << 24) | (pdata->enetaddr[3]) << 16 | + (pdata->enetaddr[4]) << 8 | (pdata->enetaddr[5]), + priv->base + ETH_PML_REG(0)); + writel_be((pdata->enetaddr[1]) | (pdata->enetaddr[0] << 8) | + ETH_PMH_VALID_MASK, priv->base + ETH_PMH_REG(0)); + + /* enable emac */ + if (running) + bcm6348_eth_mac_enable(priv); + + return 0; +} + +static const struct eth_ops bcm6348_eth_ops = { + .free_pkt = bcm6348_eth_free_pkt, + .recv = bcm6348_eth_recv, + .send = bcm6348_eth_send, + .start = bcm6348_eth_start, + .stop = bcm6348_eth_stop, + .write_hwaddr = bcm6348_eth_write_hwaddr, +}; + +static const struct udevice_id bcm6348_eth_ids[] = { + { .compatible = "brcm,bcm6348-enet", }, + { /* sentinel */ } +}; + +static int bcm6348_mdio_op(void __iomem *base, uint32_t data) +{ + /* make sure mii interrupt status is cleared */ + writel_be(ETH_IR_MII_MASK, base + ETH_IR_REG); + + /* issue mii op */ + writel_be(data, base + MII_DAT_REG); + + /* wait until emac is disabled */ + return wait_for_bit_be32(base + ETH_IR_REG, + ETH_IR_MII_MASK, true, + ETH_TIMEOUT, false); +} + +static int bcm6348_mdio_read(struct mii_dev *bus, int addr, int devaddr, + int reg) +{ + void __iomem *base = bus->priv; + uint32_t val; + + val = MII_DAT_OP_READ; + val |= (reg << MII_DAT_REG_SHIFT) & MII_DAT_REG_MASK; + val |= (0x2 << MII_DAT_TA_SHIFT) & MII_DAT_TA_MASK; + val |= (addr << MII_DAT_PHY_SHIFT) & MII_DAT_PHY_MASK; + + if (bcm6348_mdio_op(base, val)) { + pr_err("%s: timeout\n", __func__); + return -EINVAL; + } + + val = readl_be(base + MII_DAT_REG) & MII_DAT_DATA_MASK; + val >>= MII_DAT_DATA_SHIFT; + + return val; +} + +static int bcm6348_mdio_write(struct mii_dev *bus, int addr, int dev_addr, + int reg, u16 value) +{ + void __iomem *base = bus->priv; + uint32_t val; + + val = MII_DAT_OP_WRITE; + val |= (reg << MII_DAT_REG_SHIFT) & MII_DAT_REG_MASK; + val |= (0x2 << MII_DAT_TA_SHIFT) & MII_DAT_TA_MASK; + val |= (addr << MII_DAT_PHY_SHIFT) & MII_DAT_PHY_MASK; + val |= (value << MII_DAT_DATA_SHIFT) & MII_DAT_DATA_MASK; + + if (bcm6348_mdio_op(base, val)) { + pr_err("%s: timeout\n", __func__); + return -EINVAL; + } + + return 0; +} + +static int bcm6348_mdio_init(const char *name, void __iomem *base) +{ + struct mii_dev *bus; + + bus = mdio_alloc(); + if (!bus) { + pr_err("%s: failed to allocate MDIO bus\n", __func__); + return -ENOMEM; + } + + bus->read = bcm6348_mdio_read; + bus->write = bcm6348_mdio_write; + bus->priv = base; + snprintf(bus->name, sizeof(bus->name), "%s", name); + + return mdio_register(bus); +} + +static int bcm6348_phy_init(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + struct mii_dev *bus; + + /* get mii bus */ + bus = miiphy_get_dev_by_name(dev->name); + + /* phy connect */ + priv->phy_dev = phy_connect(bus, priv->phy_id, dev, + pdata->phy_interface); + if (!priv->phy_dev) { + pr_err("%s: no phy device\n", __func__); + return -ENODEV; + } + + priv->phy_dev->supported = (SUPPORTED_10baseT_Half | + SUPPORTED_10baseT_Full | + SUPPORTED_100baseT_Half | + SUPPORTED_100baseT_Full | + SUPPORTED_Autoneg | + SUPPORTED_Pause | + SUPPORTED_MII); + priv->phy_dev->advertising = priv->phy_dev->supported; + + /* phy config */ + phy_config(priv->phy_dev); + + return 0; +} + +static int bcm6348_eth_probe(struct udevice *dev) +{ + struct eth_pdata *pdata = dev_get_platdata(dev); + struct bcm6348_eth_priv *priv = dev_get_priv(dev); + struct ofnode_phandle_args phy; + const char *phy_mode; + int ret, i; + + /* get base address */ + priv->base = dev_remap_addr(dev); + if (!priv->base) + return -EINVAL; + pdata->iobase = (phys_addr_t) priv->base; + + /* get phy mode */ + pdata->phy_interface = PHY_INTERFACE_MODE_NONE; + 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 == PHY_INTERFACE_MODE_NONE) + return -ENODEV; + + /* get phy */ + if (dev_read_phandle_with_args(dev, "phy", NULL, 0, 0, &phy)) + return -ENOENT; + priv->phy_id = ofnode_read_u32_default(phy.node, "reg", -1); + + /* get dma channels */ + ret = dma_get_by_name(dev, "tx", &priv->tx_dma); + if (ret) + return -EINVAL; + + ret = dma_get_by_name(dev, "rx", &priv->rx_dma); + if (ret) + return -EINVAL; + + /* try to enable clocks */ + for (i = 0; ; i++) { + struct clk clk; + int ret; + + ret = clk_get_by_index(dev, i, &clk); + if (ret < 0) + break; + + ret = clk_enable(&clk); + if (ret < 0) { + pr_err("%s: error enabling clock %d\n", __func__, i); + return ret; + } + + ret = clk_free(&clk); + if (ret < 0) { + pr_err("%s: error freeing clock %d\n", __func__, i); + return ret; + } + } + + /* try to perform resets */ + for (i = 0; ; i++) { + struct reset_ctl reset; + int ret; + + ret = reset_get_by_index(dev, i, &reset); + if (ret < 0) + break; + + ret = reset_deassert(&reset); + if (ret < 0) { + pr_err("%s: error deasserting reset %d\n", __func__, i); + return ret; + } + + ret = reset_free(&reset); + if (ret < 0) { + pr_err("%s: error freeing reset %d\n", __func__, i); + return ret; + } + } + + /* disable emac */ + bcm6348_eth_mac_disable(priv); + + /* reset emac */ + bcm6348_eth_mac_reset(priv); + + /* select correct mii interface */ + if (pdata->phy_interface == PHY_INTERFACE_MODE_INTERNAL) + clrbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_EPHY_MASK); + else + setbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_EPHY_MASK); + + /* turn on mdc clock */ + writel_be((0x1f << MII_SC_MDCFREQDIV_SHIFT) | + MII_SC_PREAMBLE_EN_MASK, priv->base + MII_SC_REG); + + /* set mib counters to not clear when read */ + clrbits_be32(priv->base + MIB_CTL_REG, MIB_CTL_RDCLEAR_MASK); + + /* initialize perfect match registers */ + for (i = 0; i < ETH_PM_CNT; i++) { + writel_be(0, priv->base + ETH_PML_REG(i)); + writel_be(0, priv->base + ETH_PMH_REG(i)); + } + + /* init mii bus */ + ret = bcm6348_mdio_init(dev->name, priv->base); + if (ret) + return ret; + + /* init phy */ + ret = bcm6348_phy_init(dev); + if (ret) + return ret; + + return 0; +} + +U_BOOT_DRIVER(bcm6348_eth) = { + .name = "bcm6348_eth", + .id = UCLASS_ETH, + .of_match = bcm6348_eth_ids, + .ops = &bcm6348_eth_ops, + .platdata_auto_alloc_size = sizeof(struct eth_pdata), + .priv_auto_alloc_size = sizeof(struct bcm6348_eth_priv), + .probe = bcm6348_eth_probe, +}; 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