// SPDX-License-Identifier: GPL-2.0+ /* * drivers/net/ravb.c * This file is driver for Renesas Ethernet AVB. * * Copyright (C) 2015-2017 Renesas Electronics Corporation * * Based on the SuperH Ethernet driver. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* Registers */ #define RAVB_REG_CCC 0x000 #define RAVB_REG_DBAT 0x004 #define RAVB_REG_CSR 0x00C #define RAVB_REG_APSR 0x08C #define RAVB_REG_RCR 0x090 #define RAVB_REG_TGC 0x300 #define RAVB_REG_TCCR 0x304 #define RAVB_REG_RIC0 0x360 #define RAVB_REG_RIC1 0x368 #define RAVB_REG_RIC2 0x370 #define RAVB_REG_TIC 0x378 #define RAVB_REG_ECMR 0x500 #define RAVB_REG_RFLR 0x508 #define RAVB_REG_ECSIPR 0x518 #define RAVB_REG_PIR 0x520 #define RAVB_REG_GECMR 0x5b0 #define RAVB_REG_MAHR 0x5c0 #define RAVB_REG_MALR 0x5c8 #define CCC_OPC_CONFIG BIT(0) #define CCC_OPC_OPERATION BIT(1) #define CCC_BOC BIT(20) #define CSR_OPS 0x0000000F #define CSR_OPS_CONFIG BIT(1) #define APSR_RDM BIT(13) #define APSR_TDM BIT(14) #define TCCR_TSRQ0 BIT(0) #define RFLR_RFL_MIN 0x05EE #define PIR_MDI BIT(3) #define PIR_MDO BIT(2) #define PIR_MMD BIT(1) #define PIR_MDC BIT(0) #define ECMR_TRCCM BIT(26) #define ECMR_RZPF BIT(20) #define ECMR_PFR BIT(18) #define ECMR_RXF BIT(17) #define ECMR_RE BIT(6) #define ECMR_TE BIT(5) #define ECMR_DM BIT(1) #define ECMR_CHG_DM (ECMR_TRCCM | ECMR_RZPF | ECMR_PFR | ECMR_RXF) /* DMA Descriptors */ #define RAVB_NUM_BASE_DESC 16 #define RAVB_NUM_TX_DESC 8 #define RAVB_NUM_RX_DESC 8 #define RAVB_TX_QUEUE_OFFSET 0 #define RAVB_RX_QUEUE_OFFSET 4 #define RAVB_DESC_DT(n) ((n) << 28) #define RAVB_DESC_DT_FSINGLE RAVB_DESC_DT(0x7) #define RAVB_DESC_DT_LINKFIX RAVB_DESC_DT(0x9) #define RAVB_DESC_DT_EOS RAVB_DESC_DT(0xa) #define RAVB_DESC_DT_FEMPTY RAVB_DESC_DT(0xc) #define RAVB_DESC_DT_EEMPTY RAVB_DESC_DT(0x3) #define RAVB_DESC_DT_MASK RAVB_DESC_DT(0xf) #define RAVB_DESC_DS(n) (((n) & 0xfff) << 0) #define RAVB_DESC_DS_MASK 0xfff #define RAVB_RX_DESC_MSC_MC BIT(23) #define RAVB_RX_DESC_MSC_CEEF BIT(22) #define RAVB_RX_DESC_MSC_CRL BIT(21) #define RAVB_RX_DESC_MSC_FRE BIT(20) #define RAVB_RX_DESC_MSC_RTLF BIT(19) #define RAVB_RX_DESC_MSC_RTSF BIT(18) #define RAVB_RX_DESC_MSC_RFE BIT(17) #define RAVB_RX_DESC_MSC_CRC BIT(16) #define RAVB_RX_DESC_MSC_MASK (0xff << 16) #define RAVB_RX_DESC_MSC_RX_ERR_MASK \ (RAVB_RX_DESC_MSC_CRC | RAVB_RX_DESC_MSC_RFE | RAVB_RX_DESC_MSC_RTLF | \ RAVB_RX_DESC_MSC_RTSF | RAVB_RX_DESC_MSC_CEEF) #define RAVB_TX_TIMEOUT_MS 1000 struct ravb_desc { u32 ctrl; u32 dptr; }; struct ravb_rxdesc { struct ravb_desc data; struct ravb_desc link; u8 __pad[48]; u8 packet[PKTSIZE_ALIGN]; }; struct ravb_priv { struct ravb_desc base_desc[RAVB_NUM_BASE_DESC]; struct ravb_desc tx_desc[RAVB_NUM_TX_DESC]; struct ravb_rxdesc rx_desc[RAVB_NUM_RX_DESC]; u32 rx_desc_idx; u32 tx_desc_idx; struct phy_device *phydev; struct mii_dev *bus; void __iomem *iobase; struct clk_bulk clks; struct gpio_desc reset_gpio; }; static inline void ravb_flush_dcache(u32 addr, u32 len) { flush_dcache_range(addr, addr + len); } static inline void ravb_invalidate_dcache(u32 addr, u32 len) { u32 start = addr & ~((uintptr_t)ARCH_DMA_MINALIGN - 1); u32 end = roundup(addr + len, ARCH_DMA_MINALIGN); invalidate_dcache_range(start, end); } static int ravb_send(struct udevice *dev, void *packet, int len) { struct ravb_priv *eth = dev_get_priv(dev); struct ravb_desc *desc = ð->tx_desc[eth->tx_desc_idx]; unsigned int start; /* Update TX descriptor */ ravb_flush_dcache((uintptr_t)packet, len); memset(desc, 0x0, sizeof(*desc)); desc->ctrl = RAVB_DESC_DT_FSINGLE | RAVB_DESC_DS(len); desc->dptr = (uintptr_t)packet; ravb_flush_dcache((uintptr_t)desc, sizeof(*desc)); /* Restart the transmitter if disabled */ if (!(readl(eth->iobase + RAVB_REG_TCCR) & TCCR_TSRQ0)) setbits_le32(eth->iobase + RAVB_REG_TCCR, TCCR_TSRQ0); /* Wait until packet is transmitted */ start = get_timer(0); while (get_timer(start) < RAVB_TX_TIMEOUT_MS) { ravb_invalidate_dcache((uintptr_t)desc, sizeof(*desc)); if ((desc->ctrl & RAVB_DESC_DT_MASK) != RAVB_DESC_DT_FSINGLE) break; udelay(10); }; if (get_timer(start) >= RAVB_TX_TIMEOUT_MS) return -ETIMEDOUT; eth->tx_desc_idx = (eth->tx_desc_idx + 1) % (RAVB_NUM_TX_DESC - 1); return 0; } static int ravb_recv(struct udevice *dev, int flags, uchar **packetp) { struct ravb_priv *eth = dev_get_priv(dev); struct ravb_rxdesc *desc = ð->rx_desc[eth->rx_desc_idx]; int len; u8 *packet; /* Check if the rx descriptor is ready */ ravb_invalidate_dcache((uintptr_t)desc, sizeof(*desc)); if ((desc->data.ctrl & RAVB_DESC_DT_MASK) == RAVB_DESC_DT_FEMPTY) return -EAGAIN; /* Check for errors */ if (desc->data.ctrl & RAVB_RX_DESC_MSC_RX_ERR_MASK) { desc->data.ctrl &= ~RAVB_RX_DESC_MSC_MASK; return -EAGAIN; } len = desc->data.ctrl & RAVB_DESC_DS_MASK; packet = (u8 *)(uintptr_t)desc->data.dptr; ravb_invalidate_dcache((uintptr_t)packet, len); *packetp = packet; return len; } static int ravb_free_pkt(struct udevice *dev, uchar *packet, int length) { struct ravb_priv *eth = dev_get_priv(dev); struct ravb_rxdesc *desc = ð->rx_desc[eth->rx_desc_idx]; /* Make current descriptor available again */ desc->data.ctrl = RAVB_DESC_DT_FEMPTY | RAVB_DESC_DS(PKTSIZE_ALIGN); ravb_flush_dcache((uintptr_t)desc, sizeof(*desc)); /* Point to the next descriptor */ eth->rx_desc_idx = (eth->rx_desc_idx + 1) % RAVB_NUM_RX_DESC; desc = ð->rx_desc[eth->rx_desc_idx]; ravb_invalidate_dcache((uintptr_t)desc, sizeof(*desc)); return 0; } static int ravb_reset(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); /* Set config mode */ writel(CCC_OPC_CONFIG, eth->iobase + RAVB_REG_CCC); /* Check the operating mode is changed to the config mode. */ return wait_for_bit_le32(eth->iobase + RAVB_REG_CSR, CSR_OPS_CONFIG, true, 100, true); } static void ravb_base_desc_init(struct ravb_priv *eth) { const u32 desc_size = RAVB_NUM_BASE_DESC * sizeof(struct ravb_desc); int i; /* Initialize all descriptors */ memset(eth->base_desc, 0x0, desc_size); for (i = 0; i < RAVB_NUM_BASE_DESC; i++) eth->base_desc[i].ctrl = RAVB_DESC_DT_EOS; ravb_flush_dcache((uintptr_t)eth->base_desc, desc_size); /* Register the descriptor base address table */ writel((uintptr_t)eth->base_desc, eth->iobase + RAVB_REG_DBAT); } static void ravb_tx_desc_init(struct ravb_priv *eth) { const u32 desc_size = RAVB_NUM_TX_DESC * sizeof(struct ravb_desc); int i; /* Initialize all descriptors */ memset(eth->tx_desc, 0x0, desc_size); eth->tx_desc_idx = 0; for (i = 0; i < RAVB_NUM_TX_DESC; i++) eth->tx_desc[i].ctrl = RAVB_DESC_DT_EEMPTY; /* Mark the end of the descriptors */ eth->tx_desc[RAVB_NUM_TX_DESC - 1].ctrl = RAVB_DESC_DT_LINKFIX; eth->tx_desc[RAVB_NUM_TX_DESC - 1].dptr = (uintptr_t)eth->tx_desc; ravb_flush_dcache((uintptr_t)eth->tx_desc, desc_size); /* Point the controller to the TX descriptor list. */ eth->base_desc[RAVB_TX_QUEUE_OFFSET].ctrl = RAVB_DESC_DT_LINKFIX; eth->base_desc[RAVB_TX_QUEUE_OFFSET].dptr = (uintptr_t)eth->tx_desc; ravb_flush_dcache((uintptr_t)ð->base_desc[RAVB_TX_QUEUE_OFFSET], sizeof(struct ravb_desc)); } static void ravb_rx_desc_init(struct ravb_priv *eth) { const u32 desc_size = RAVB_NUM_RX_DESC * sizeof(struct ravb_rxdesc); int i; /* Initialize all descriptors */ memset(eth->rx_desc, 0x0, desc_size); eth->rx_desc_idx = 0; for (i = 0; i < RAVB_NUM_RX_DESC; i++) { eth->rx_desc[i].data.ctrl = RAVB_DESC_DT_EEMPTY | RAVB_DESC_DS(PKTSIZE_ALIGN); eth->rx_desc[i].data.dptr = (uintptr_t)eth->rx_desc[i].packet; eth->rx_desc[i].link.ctrl = RAVB_DESC_DT_LINKFIX; eth->rx_desc[i].link.dptr = (uintptr_t)ð->rx_desc[i + 1]; } /* Mark the end of the descriptors */ eth->rx_desc[RAVB_NUM_RX_DESC - 1].link.ctrl = RAVB_DESC_DT_LINKFIX; eth->rx_desc[RAVB_NUM_RX_DESC - 1].link.dptr = (uintptr_t)eth->rx_desc; ravb_flush_dcache((uintptr_t)eth->rx_desc, desc_size); /* Point the controller to the rx descriptor list */ eth->base_desc[RAVB_RX_QUEUE_OFFSET].ctrl = RAVB_DESC_DT_LINKFIX; eth->base_desc[RAVB_RX_QUEUE_OFFSET].dptr = (uintptr_t)eth->rx_desc; ravb_flush_dcache((uintptr_t)ð->base_desc[RAVB_RX_QUEUE_OFFSET], sizeof(struct ravb_desc)); } static int ravb_phy_config(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); struct eth_pdata *pdata = dev_get_plat(dev); struct phy_device *phydev; int mask = 0xffffffff, reg; if (dm_gpio_is_valid(ð->reset_gpio)) { dm_gpio_set_value(ð->reset_gpio, 1); mdelay(20); dm_gpio_set_value(ð->reset_gpio, 0); mdelay(1); } phydev = phy_find_by_mask(eth->bus, mask); if (!phydev) return -ENODEV; phy_connect_dev(phydev, dev, pdata->phy_interface); eth->phydev = phydev; phydev->supported &= SUPPORTED_100baseT_Full | SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_Pause | SUPPORTED_Asym_Pause; if (pdata->max_speed != 1000) { phydev->supported &= ~SUPPORTED_1000baseT_Full; reg = phy_read(phydev, -1, MII_CTRL1000); reg &= ~(BIT(9) | BIT(8)); phy_write(phydev, -1, MII_CTRL1000, reg); } phy_config(phydev); return 0; } /* Set Mac address */ static int ravb_write_hwaddr(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); struct eth_pdata *pdata = dev_get_plat(dev); unsigned char *mac = pdata->enetaddr; writel((mac[0] << 24) | (mac[1] << 16) | (mac[2] << 8) | mac[3], eth->iobase + RAVB_REG_MAHR); writel((mac[4] << 8) | mac[5], eth->iobase + RAVB_REG_MALR); return 0; } /* E-MAC init function */ static int ravb_mac_init(struct ravb_priv *eth) { /* Disable MAC Interrupt */ writel(0, eth->iobase + RAVB_REG_ECSIPR); /* Recv frame limit set register */ writel(RFLR_RFL_MIN, eth->iobase + RAVB_REG_RFLR); return 0; } /* AVB-DMAC init function */ static int ravb_dmac_init(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); struct eth_pdata *pdata = dev_get_plat(dev); int ret = 0; int mode = 0; unsigned int delay; bool explicit_delay = false; /* Set CONFIG mode */ ret = ravb_reset(dev); if (ret) return ret; /* Disable all interrupts */ writel(0, eth->iobase + RAVB_REG_RIC0); writel(0, eth->iobase + RAVB_REG_RIC1); writel(0, eth->iobase + RAVB_REG_RIC2); writel(0, eth->iobase + RAVB_REG_TIC); /* Set little endian */ clrbits_le32(eth->iobase + RAVB_REG_CCC, CCC_BOC); /* AVB rx set */ writel(0x18000001, eth->iobase + RAVB_REG_RCR); /* FIFO size set */ writel(0x00222210, eth->iobase + RAVB_REG_TGC); /* Delay CLK: 2ns (not applicable on R-Car E3/D3) */ if ((rmobile_get_cpu_type() == RMOBILE_CPU_TYPE_R8A77990) || (rmobile_get_cpu_type() == RMOBILE_CPU_TYPE_R8A77995)) return 0; if (!dev_read_u32(dev, "rx-internal-delay-ps", &delay)) { /* Valid values are 0 and 1800, according to DT bindings */ if (delay) { mode |= APSR_RDM; explicit_delay = true; } } if (!dev_read_u32(dev, "tx-internal-delay-ps", &delay)) { /* Valid values are 0 and 2000, according to DT bindings */ if (delay) { mode |= APSR_TDM; explicit_delay = true; } } if (!explicit_delay) { if (pdata->phy_interface == PHY_INTERFACE_MODE_RGMII_ID || pdata->phy_interface == PHY_INTERFACE_MODE_RGMII_RXID) mode |= APSR_RDM; if (pdata->phy_interface == PHY_INTERFACE_MODE_RGMII_ID || pdata->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID) mode |= APSR_TDM; } writel(mode, eth->iobase + RAVB_REG_APSR); return 0; } static int ravb_config(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); struct phy_device *phy = eth->phydev; u32 mask = ECMR_CHG_DM | ECMR_RE | ECMR_TE; int ret; /* Configure AVB-DMAC register */ ravb_dmac_init(dev); /* Configure E-MAC registers */ ravb_mac_init(eth); ravb_write_hwaddr(dev); ret = phy_startup(phy); if (ret) return ret; /* Set the transfer speed */ if (phy->speed == 100) writel(0, eth->iobase + RAVB_REG_GECMR); else if (phy->speed == 1000) writel(1, eth->iobase + RAVB_REG_GECMR); /* Check if full duplex mode is supported by the phy */ if (phy->duplex) mask |= ECMR_DM; writel(mask, eth->iobase + RAVB_REG_ECMR); return 0; } static int ravb_start(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); int ret; ret = ravb_reset(dev); if (ret) return ret; ravb_base_desc_init(eth); ravb_tx_desc_init(eth); ravb_rx_desc_init(eth); ret = ravb_config(dev); if (ret) return ret; /* Setting the control will start the AVB-DMAC process. */ writel(CCC_OPC_OPERATION, eth->iobase + RAVB_REG_CCC); return 0; } static void ravb_stop(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); phy_shutdown(eth->phydev); ravb_reset(dev); } static int ravb_probe(struct udevice *dev) { struct eth_pdata *pdata = dev_get_plat(dev); struct ravb_priv *eth = dev_get_priv(dev); struct ofnode_phandle_args phandle_args; struct mii_dev *mdiodev; void __iomem *iobase; int ret; iobase = map_physmem(pdata->iobase, 0x1000, MAP_NOCACHE); eth->iobase = iobase; ret = clk_get_bulk(dev, ð->clks); if (ret < 0) goto err_mdio_alloc; ret = dev_read_phandle_with_args(dev, "phy-handle", NULL, 0, 0, &phandle_args); if (!ret) { gpio_request_by_name_nodev(phandle_args.node, "reset-gpios", 0, ð->reset_gpio, GPIOD_IS_OUT); } if (!dm_gpio_is_valid(ð->reset_gpio)) { gpio_request_by_name(dev, "reset-gpios", 0, ð->reset_gpio, GPIOD_IS_OUT); } mdiodev = mdio_alloc(); if (!mdiodev) { ret = -ENOMEM; goto err_mdio_alloc; } mdiodev->read = bb_miiphy_read; mdiodev->write = bb_miiphy_write; bb_miiphy_buses[0].priv = eth; snprintf(mdiodev->name, sizeof(mdiodev->name), dev->name); ret = mdio_register(mdiodev); if (ret < 0) goto err_mdio_register; eth->bus = miiphy_get_dev_by_name(dev->name); /* Bring up PHY */ ret = clk_enable_bulk(ð->clks); if (ret) goto err_mdio_register; ret = ravb_reset(dev); if (ret) goto err_mdio_reset; ret = ravb_phy_config(dev); if (ret) goto err_mdio_reset; return 0; err_mdio_reset: clk_release_bulk(ð->clks); err_mdio_register: mdio_free(mdiodev); err_mdio_alloc: unmap_physmem(eth->iobase, MAP_NOCACHE); return ret; } static int ravb_remove(struct udevice *dev) { struct ravb_priv *eth = dev_get_priv(dev); clk_release_bulk(ð->clks); free(eth->phydev); mdio_unregister(eth->bus); mdio_free(eth->bus); if (dm_gpio_is_valid(ð->reset_gpio)) dm_gpio_free(dev, ð->reset_gpio); unmap_physmem(eth->iobase, MAP_NOCACHE); return 0; } int ravb_bb_init(struct bb_miiphy_bus *bus) { return 0; } int ravb_bb_mdio_active(struct bb_miiphy_bus *bus) { struct ravb_priv *eth = bus->priv; setbits_le32(eth->iobase + RAVB_REG_PIR, PIR_MMD); return 0; } int ravb_bb_mdio_tristate(struct bb_miiphy_bus *bus) { struct ravb_priv *eth = bus->priv; clrbits_le32(eth->iobase + RAVB_REG_PIR, PIR_MMD); return 0; } int ravb_bb_set_mdio(struct bb_miiphy_bus *bus, int v) { struct ravb_priv *eth = bus->priv; if (v) setbits_le32(eth->iobase + RAVB_REG_PIR, PIR_MDO); else clrbits_le32(eth->iobase + RAVB_REG_PIR, PIR_MDO); return 0; } int ravb_bb_get_mdio(struct bb_miiphy_bus *bus, int *v) { struct ravb_priv *eth = bus->priv; *v = (readl(eth->iobase + RAVB_REG_PIR) & PIR_MDI) >> 3; return 0; } int ravb_bb_set_mdc(struct bb_miiphy_bus *bus, int v) { struct ravb_priv *eth = bus->priv; if (v) setbits_le32(eth->iobase + RAVB_REG_PIR, PIR_MDC); else clrbits_le32(eth->iobase + RAVB_REG_PIR, PIR_MDC); return 0; } int ravb_bb_delay(struct bb_miiphy_bus *bus) { udelay(10); return 0; } struct bb_miiphy_bus bb_miiphy_buses[] = { { .name = "ravb", .init = ravb_bb_init, .mdio_active = ravb_bb_mdio_active, .mdio_tristate = ravb_bb_mdio_tristate, .set_mdio = ravb_bb_set_mdio, .get_mdio = ravb_bb_get_mdio, .set_mdc = ravb_bb_set_mdc, .delay = ravb_bb_delay, }, }; int bb_miiphy_buses_num = ARRAY_SIZE(bb_miiphy_buses); static const struct eth_ops ravb_ops = { .start = ravb_start, .send = ravb_send, .recv = ravb_recv, .free_pkt = ravb_free_pkt, .stop = ravb_stop, .write_hwaddr = ravb_write_hwaddr, }; int ravb_of_to_plat(struct udevice *dev) { struct eth_pdata *pdata = dev_get_plat(dev); const fdt32_t *cell; pdata->iobase = dev_read_addr(dev); pdata->phy_interface = dev_read_phy_mode(dev); if (pdata->phy_interface == PHY_INTERFACE_MODE_NA) return -EINVAL; pdata->max_speed = 1000; cell = fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "max-speed", NULL); if (cell) pdata->max_speed = fdt32_to_cpu(*cell); sprintf(bb_miiphy_buses[0].name, dev->name); return 0; } static const struct udevice_id ravb_ids[] = { { .compatible = "renesas,etheravb-rcar-gen3" }, { } }; U_BOOT_DRIVER(eth_ravb) = { .name = "ravb", .id = UCLASS_ETH, .of_match = ravb_ids, .of_to_plat = ravb_of_to_plat, .probe = ravb_probe, .remove = ravb_remove, .ops = &ravb_ops, .priv_auto = sizeof(struct ravb_priv), .plat_auto = sizeof(struct eth_pdata), .flags = DM_FLAG_ALLOC_PRIV_DMA, };