diff options
Diffstat (limited to 'drivers/net/ethernet/allwinner/sun4i-emac.c')
| -rw-r--r-- | drivers/net/ethernet/allwinner/sun4i-emac.c | 1156 |
1 files changed, 1156 insertions, 0 deletions
diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c new file mode 100644 index 000000000..a94c62956 --- /dev/null +++ b/drivers/net/ethernet/allwinner/sun4i-emac.c @@ -0,0 +1,1156 @@ +/* + * Allwinner EMAC Fast Ethernet driver for Linux. + * + * Copyright 2012-2013 Stefan Roese <sr@denx.de> + * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com> + * + * Based on the Linux driver provided by Allwinner: + * Copyright (C) 1997 Sten Wang + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/clk.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/mii.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_mdio.h> +#include <linux/of_net.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/phy.h> +#include <linux/soc/sunxi/sunxi_sram.h> +#include <linux/dmaengine.h> + +#include "sun4i-emac.h" + +#define DRV_NAME "sun4i-emac" + +#define EMAC_MAX_FRAME_LEN 0x0600 + +#define EMAC_DEFAULT_MSG_ENABLE 0x0000 +static int debug = -1; /* defaults above */; +module_param(debug, int, 0); +MODULE_PARM_DESC(debug, "debug message flags"); + +/* Transmit timeout, default 5 seconds. */ +static int watchdog = 5000; +module_param(watchdog, int, 0400); +MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds"); + +/* EMAC register address locking. + * + * The EMAC uses an address register to control where data written + * to the data register goes. This means that the address register + * must be preserved over interrupts or similar calls. + * + * During interrupt and other critical calls, a spinlock is used to + * protect the system, but the calls themselves save the address + * in the address register in case they are interrupting another + * access to the device. + * + * For general accesses a lock is provided so that calls which are + * allowed to sleep are serialised so that the address register does + * not need to be saved. This lock also serves to serialise access + * to the EEPROM and PHY access registers which are shared between + * these two devices. + */ + +/* The driver supports the original EMACE, and now the two newer + * devices, EMACA and EMACB. + */ + +struct emac_board_info { + struct clk *clk; + struct device *dev; + struct platform_device *pdev; + spinlock_t lock; + void __iomem *membase; + u32 msg_enable; + struct net_device *ndev; + u16 tx_fifo_stat; + + int emacrx_completed_flag; + + struct device_node *phy_node; + unsigned int link; + unsigned int speed; + unsigned int duplex; + + phy_interface_t phy_interface; + struct dma_chan *rx_chan; + phys_addr_t emac_rx_fifo; +}; + +struct emac_dma_req { + struct emac_board_info *db; + struct dma_async_tx_descriptor *desc; + struct sk_buff *skb; + dma_addr_t rxbuf; + int count; +}; + +static void emac_update_speed(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + unsigned int reg_val; + + /* set EMAC SPEED, depend on PHY */ + reg_val = readl(db->membase + EMAC_MAC_SUPP_REG); + reg_val &= ~EMAC_MAC_SUPP_100M; + if (db->speed == SPEED_100) + reg_val |= EMAC_MAC_SUPP_100M; + writel(reg_val, db->membase + EMAC_MAC_SUPP_REG); +} + +static void emac_update_duplex(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + unsigned int reg_val; + + /* set duplex depend on phy */ + reg_val = readl(db->membase + EMAC_MAC_CTL1_REG); + reg_val &= ~EMAC_MAC_CTL1_DUPLEX_EN; + if (db->duplex) + reg_val |= EMAC_MAC_CTL1_DUPLEX_EN; + writel(reg_val, db->membase + EMAC_MAC_CTL1_REG); +} + +static void emac_handle_link_change(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + struct phy_device *phydev = dev->phydev; + unsigned long flags; + int status_change = 0; + + if (phydev->link) { + if (db->speed != phydev->speed) { + spin_lock_irqsave(&db->lock, flags); + db->speed = phydev->speed; + emac_update_speed(dev); + spin_unlock_irqrestore(&db->lock, flags); + status_change = 1; + } + + if (db->duplex != phydev->duplex) { + spin_lock_irqsave(&db->lock, flags); + db->duplex = phydev->duplex; + emac_update_duplex(dev); + spin_unlock_irqrestore(&db->lock, flags); + status_change = 1; + } + } + + if (phydev->link != db->link) { + if (!phydev->link) { + db->speed = 0; + db->duplex = -1; + } + db->link = phydev->link; + + status_change = 1; + } + + if (status_change) + phy_print_status(phydev); +} + +static int emac_mdio_probe(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + struct phy_device *phydev; + + /* to-do: PHY interrupts are currently not supported */ + + /* attach the mac to the phy */ + phydev = of_phy_connect(db->ndev, db->phy_node, + &emac_handle_link_change, 0, + db->phy_interface); + if (!phydev) { + netdev_err(db->ndev, "could not find the PHY\n"); + return -ENODEV; + } + + /* mask with MAC supported features */ + phy_set_max_speed(phydev, SPEED_100); + + db->link = 0; + db->speed = 0; + db->duplex = -1; + + return 0; +} + +static void emac_mdio_remove(struct net_device *dev) +{ + phy_disconnect(dev->phydev); +} + +static void emac_reset(struct emac_board_info *db) +{ + dev_dbg(db->dev, "resetting device\n"); + + /* RESET device */ + writel(0, db->membase + EMAC_CTL_REG); + udelay(200); + writel(EMAC_CTL_RESET, db->membase + EMAC_CTL_REG); + udelay(200); +} + +static void emac_outblk_32bit(void __iomem *reg, void *data, int count) +{ + writesl(reg, data, round_up(count, 4) / 4); +} + +static void emac_inblk_32bit(void __iomem *reg, void *data, int count) +{ + readsl(reg, data, round_up(count, 4) / 4); +} + +static struct emac_dma_req * +emac_alloc_dma_req(struct emac_board_info *db, + struct dma_async_tx_descriptor *desc, struct sk_buff *skb, + dma_addr_t rxbuf, int count) +{ + struct emac_dma_req *req; + + req = kzalloc(sizeof(struct emac_dma_req), GFP_ATOMIC); + if (!req) + return NULL; + + req->db = db; + req->desc = desc; + req->skb = skb; + req->rxbuf = rxbuf; + req->count = count; + return req; +} + +static void emac_free_dma_req(struct emac_dma_req *req) +{ + kfree(req); +} + +static void emac_dma_done_callback(void *arg) +{ + struct emac_dma_req *req = arg; + struct emac_board_info *db = req->db; + struct sk_buff *skb = req->skb; + struct net_device *dev = db->ndev; + int rxlen = req->count; + u32 reg_val; + + dma_unmap_single(db->dev, req->rxbuf, rxlen, DMA_FROM_DEVICE); + + skb->protocol = eth_type_trans(skb, dev); + netif_rx(skb); + dev->stats.rx_bytes += rxlen; + /* Pass to upper layer */ + dev->stats.rx_packets++; + + /* re enable cpu receive */ + reg_val = readl(db->membase + EMAC_RX_CTL_REG); + reg_val &= ~EMAC_RX_CTL_DMA_EN; + writel(reg_val, db->membase + EMAC_RX_CTL_REG); + + /* re enable interrupt */ + reg_val = readl(db->membase + EMAC_INT_CTL_REG); + reg_val |= EMAC_INT_CTL_RX_EN; + writel(reg_val, db->membase + EMAC_INT_CTL_REG); + + db->emacrx_completed_flag = 1; + emac_free_dma_req(req); +} + +static int emac_dma_inblk_32bit(struct emac_board_info *db, + struct sk_buff *skb, void *rdptr, int count) +{ + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + dma_addr_t rxbuf; + struct emac_dma_req *req; + int ret = 0; + + rxbuf = dma_map_single(db->dev, rdptr, count, DMA_FROM_DEVICE); + ret = dma_mapping_error(db->dev, rxbuf); + if (ret) { + dev_err(db->dev, "dma mapping error.\n"); + return ret; + } + + desc = dmaengine_prep_slave_single(db->rx_chan, rxbuf, count, + DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + dev_err(db->dev, "prepare slave single failed\n"); + ret = -ENOMEM; + goto prepare_err; + } + + req = emac_alloc_dma_req(db, desc, skb, rxbuf, count); + if (!req) { + dev_err(db->dev, "alloc emac dma req error.\n"); + ret = -ENOMEM; + goto alloc_req_err; + } + + desc->callback_param = req; + desc->callback = emac_dma_done_callback; + + cookie = dmaengine_submit(desc); + ret = dma_submit_error(cookie); + if (ret) { + dev_err(db->dev, "dma submit error.\n"); + goto submit_err; + } + + dma_async_issue_pending(db->rx_chan); + return ret; + +submit_err: + emac_free_dma_req(req); + +alloc_req_err: + dmaengine_desc_free(desc); + +prepare_err: + dma_unmap_single(db->dev, rxbuf, count, DMA_FROM_DEVICE); + return ret; +} + +/* ethtool ops */ +static void emac_get_drvinfo(struct net_device *dev, + struct ethtool_drvinfo *info) +{ + strscpy(info->driver, DRV_NAME, sizeof(info->driver)); + strscpy(info->bus_info, dev_name(&dev->dev), sizeof(info->bus_info)); +} + +static u32 emac_get_msglevel(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + + return db->msg_enable; +} + +static void emac_set_msglevel(struct net_device *dev, u32 value) +{ + struct emac_board_info *db = netdev_priv(dev); + + db->msg_enable = value; +} + +static const struct ethtool_ops emac_ethtool_ops = { + .get_drvinfo = emac_get_drvinfo, + .get_link = ethtool_op_get_link, + .get_link_ksettings = phy_ethtool_get_link_ksettings, + .set_link_ksettings = phy_ethtool_set_link_ksettings, + .get_msglevel = emac_get_msglevel, + .set_msglevel = emac_set_msglevel, +}; + +static unsigned int emac_setup(struct net_device *ndev) +{ + struct emac_board_info *db = netdev_priv(ndev); + unsigned int reg_val; + + /* set up TX */ + reg_val = readl(db->membase + EMAC_TX_MODE_REG); + + writel(reg_val | EMAC_TX_MODE_ABORTED_FRAME_EN, + db->membase + EMAC_TX_MODE_REG); + + /* set MAC */ + /* set MAC CTL0 */ + reg_val = readl(db->membase + EMAC_MAC_CTL0_REG); + writel(reg_val | EMAC_MAC_CTL0_RX_FLOW_CTL_EN | + EMAC_MAC_CTL0_TX_FLOW_CTL_EN, + db->membase + EMAC_MAC_CTL0_REG); + + /* set MAC CTL1 */ + reg_val = readl(db->membase + EMAC_MAC_CTL1_REG); + reg_val |= EMAC_MAC_CTL1_LEN_CHECK_EN; + reg_val |= EMAC_MAC_CTL1_CRC_EN; + reg_val |= EMAC_MAC_CTL1_PAD_EN; + writel(reg_val, db->membase + EMAC_MAC_CTL1_REG); + + /* set up IPGT */ + writel(EMAC_MAC_IPGT_FULL_DUPLEX, db->membase + EMAC_MAC_IPGT_REG); + + /* set up IPGR */ + writel((EMAC_MAC_IPGR_IPG1 << 8) | EMAC_MAC_IPGR_IPG2, + db->membase + EMAC_MAC_IPGR_REG); + + /* set up Collison window */ + writel((EMAC_MAC_CLRT_COLLISION_WINDOW << 8) | EMAC_MAC_CLRT_RM, + db->membase + EMAC_MAC_CLRT_REG); + + /* set up Max Frame Length */ + writel(EMAC_MAX_FRAME_LEN, + db->membase + EMAC_MAC_MAXF_REG); + + return 0; +} + +static void emac_set_rx_mode(struct net_device *ndev) +{ + struct emac_board_info *db = netdev_priv(ndev); + unsigned int reg_val; + + /* set up RX */ + reg_val = readl(db->membase + EMAC_RX_CTL_REG); + + if (ndev->flags & IFF_PROMISC) + reg_val |= EMAC_RX_CTL_PASS_ALL_EN; + else + reg_val &= ~EMAC_RX_CTL_PASS_ALL_EN; + + writel(reg_val | EMAC_RX_CTL_PASS_LEN_OOR_EN | + EMAC_RX_CTL_ACCEPT_UNICAST_EN | EMAC_RX_CTL_DA_FILTER_EN | + EMAC_RX_CTL_ACCEPT_MULTICAST_EN | + EMAC_RX_CTL_ACCEPT_BROADCAST_EN, + db->membase + EMAC_RX_CTL_REG); +} + +static unsigned int emac_powerup(struct net_device *ndev) +{ + struct emac_board_info *db = netdev_priv(ndev); + unsigned int reg_val; + + /* initial EMAC */ + /* flush RX FIFO */ + reg_val = readl(db->membase + EMAC_RX_CTL_REG); + reg_val |= EMAC_RX_CTL_FLUSH_FIFO; + writel(reg_val, db->membase + EMAC_RX_CTL_REG); + udelay(1); + + /* initial MAC */ + /* soft reset MAC */ + reg_val = readl(db->membase + EMAC_MAC_CTL0_REG); + reg_val &= ~EMAC_MAC_CTL0_SOFT_RESET; + writel(reg_val, db->membase + EMAC_MAC_CTL0_REG); + + /* set MII clock */ + reg_val = readl(db->membase + EMAC_MAC_MCFG_REG); + reg_val &= ~EMAC_MAC_MCFG_MII_CLKD_MASK; + reg_val |= EMAC_MAC_MCFG_MII_CLKD_72; + writel(reg_val, db->membase + EMAC_MAC_MCFG_REG); + + /* clear RX counter */ + writel(0x0, db->membase + EMAC_RX_FBC_REG); + + /* disable all interrupt and clear interrupt status */ + writel(0, db->membase + EMAC_INT_CTL_REG); + reg_val = readl(db->membase + EMAC_INT_STA_REG); + writel(reg_val, db->membase + EMAC_INT_STA_REG); + + udelay(1); + + /* set up EMAC */ + emac_setup(ndev); + + /* set mac_address to chip */ + writel(ndev->dev_addr[0] << 16 | ndev->dev_addr[1] << 8 | ndev-> + dev_addr[2], db->membase + EMAC_MAC_A1_REG); + writel(ndev->dev_addr[3] << 16 | ndev->dev_addr[4] << 8 | ndev-> + dev_addr[5], db->membase + EMAC_MAC_A0_REG); + + mdelay(1); + + return 0; +} + +static int emac_set_mac_address(struct net_device *dev, void *p) +{ + struct sockaddr *addr = p; + struct emac_board_info *db = netdev_priv(dev); + + if (netif_running(dev)) + return -EBUSY; + + eth_hw_addr_set(dev, addr->sa_data); + + writel(dev->dev_addr[0] << 16 | dev->dev_addr[1] << 8 | dev-> + dev_addr[2], db->membase + EMAC_MAC_A1_REG); + writel(dev->dev_addr[3] << 16 | dev->dev_addr[4] << 8 | dev-> + dev_addr[5], db->membase + EMAC_MAC_A0_REG); + + return 0; +} + +/* Initialize emac board */ +static void emac_init_device(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + unsigned long flags; + unsigned int reg_val; + + spin_lock_irqsave(&db->lock, flags); + + emac_update_speed(dev); + emac_update_duplex(dev); + + /* enable RX/TX */ + reg_val = readl(db->membase + EMAC_CTL_REG); + writel(reg_val | EMAC_CTL_RESET | EMAC_CTL_TX_EN | EMAC_CTL_RX_EN, + db->membase + EMAC_CTL_REG); + + /* enable RX/TX0/RX Hlevel interrup */ + reg_val = readl(db->membase + EMAC_INT_CTL_REG); + reg_val |= (EMAC_INT_CTL_TX_EN | EMAC_INT_CTL_TX_ABRT_EN | EMAC_INT_CTL_RX_EN); + writel(reg_val, db->membase + EMAC_INT_CTL_REG); + + spin_unlock_irqrestore(&db->lock, flags); +} + +/* Our watchdog timed out. Called by the networking layer */ +static void emac_timeout(struct net_device *dev, unsigned int txqueue) +{ + struct emac_board_info *db = netdev_priv(dev); + unsigned long flags; + + if (netif_msg_timer(db)) + dev_err(db->dev, "tx time out.\n"); + + /* Save previous register address */ + spin_lock_irqsave(&db->lock, flags); + + netif_stop_queue(dev); + emac_reset(db); + emac_init_device(dev); + /* We can accept TX packets again */ + netif_trans_update(dev); + netif_wake_queue(dev); + + /* Restore previous register address */ + spin_unlock_irqrestore(&db->lock, flags); +} + +/* Hardware start transmission. + * Send a packet to media from the upper layer. + */ +static netdev_tx_t emac_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + unsigned long channel; + unsigned long flags; + + channel = db->tx_fifo_stat & 3; + if (channel == 3) + return NETDEV_TX_BUSY; + + channel = (channel == 1 ? 1 : 0); + + spin_lock_irqsave(&db->lock, flags); + + writel(channel, db->membase + EMAC_TX_INS_REG); + + emac_outblk_32bit(db->membase + EMAC_TX_IO_DATA_REG, + skb->data, skb->len); + dev->stats.tx_bytes += skb->len; + + db->tx_fifo_stat |= 1 << channel; + /* TX control: First packet immediately send, second packet queue */ + if (channel == 0) { + /* set TX len */ + writel(skb->len, db->membase + EMAC_TX_PL0_REG); + /* start translate from fifo to phy */ + writel(readl(db->membase + EMAC_TX_CTL0_REG) | 1, + db->membase + EMAC_TX_CTL0_REG); + + /* save the time stamp */ + netif_trans_update(dev); + } else if (channel == 1) { + /* set TX len */ + writel(skb->len, db->membase + EMAC_TX_PL1_REG); + /* start translate from fifo to phy */ + writel(readl(db->membase + EMAC_TX_CTL1_REG) | 1, + db->membase + EMAC_TX_CTL1_REG); + + /* save the time stamp */ + netif_trans_update(dev); + } + + if ((db->tx_fifo_stat & 3) == 3) { + /* Second packet */ + netif_stop_queue(dev); + } + + spin_unlock_irqrestore(&db->lock, flags); + + /* free this SKB */ + dev_consume_skb_any(skb); + + return NETDEV_TX_OK; +} + +/* EMAC interrupt handler + * receive the packet to upper layer, free the transmitted packet + */ +static void emac_tx_done(struct net_device *dev, struct emac_board_info *db, + unsigned int tx_status) +{ + /* One packet sent complete */ + db->tx_fifo_stat &= ~(tx_status & 3); + if (3 == (tx_status & 3)) + dev->stats.tx_packets += 2; + else + dev->stats.tx_packets++; + + if (netif_msg_tx_done(db)) + dev_dbg(db->dev, "tx done, NSR %02x\n", tx_status); + + netif_wake_queue(dev); +} + +/* Received a packet and pass to upper layer + */ +static void emac_rx(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + struct sk_buff *skb; + u8 *rdptr; + bool good_packet; + unsigned int reg_val; + u32 rxhdr, rxstatus, rxcount, rxlen; + + /* Check packet ready or not */ + while (1) { + /* race warning: the first packet might arrive with + * the interrupts disabled, but the second will fix + * it + */ + rxcount = readl(db->membase + EMAC_RX_FBC_REG); + + if (netif_msg_rx_status(db)) + dev_dbg(db->dev, "RXCount: %x\n", rxcount); + + if (!rxcount) { + db->emacrx_completed_flag = 1; + reg_val = readl(db->membase + EMAC_INT_CTL_REG); + reg_val |= (EMAC_INT_CTL_TX_EN | + EMAC_INT_CTL_TX_ABRT_EN | + EMAC_INT_CTL_RX_EN); + writel(reg_val, db->membase + EMAC_INT_CTL_REG); + + /* had one stuck? */ + rxcount = readl(db->membase + EMAC_RX_FBC_REG); + if (!rxcount) + return; + } + + reg_val = readl(db->membase + EMAC_RX_IO_DATA_REG); + if (netif_msg_rx_status(db)) + dev_dbg(db->dev, "receive header: %x\n", reg_val); + if (reg_val != EMAC_UNDOCUMENTED_MAGIC) { + /* disable RX */ + reg_val = readl(db->membase + EMAC_CTL_REG); + writel(reg_val & ~EMAC_CTL_RX_EN, + db->membase + EMAC_CTL_REG); + + /* Flush RX FIFO */ + reg_val = readl(db->membase + EMAC_RX_CTL_REG); + writel(reg_val | (1 << 3), + db->membase + EMAC_RX_CTL_REG); + + do { + reg_val = readl(db->membase + EMAC_RX_CTL_REG); + } while (reg_val & (1 << 3)); + + /* enable RX */ + reg_val = readl(db->membase + EMAC_CTL_REG); + writel(reg_val | EMAC_CTL_RX_EN, + db->membase + EMAC_CTL_REG); + reg_val = readl(db->membase + EMAC_INT_CTL_REG); + reg_val |= (EMAC_INT_CTL_TX_EN | + EMAC_INT_CTL_TX_ABRT_EN | + EMAC_INT_CTL_RX_EN); + writel(reg_val, db->membase + EMAC_INT_CTL_REG); + + db->emacrx_completed_flag = 1; + + return; + } + + /* A packet ready now & Get status/length */ + good_packet = true; + + rxhdr = readl(db->membase + EMAC_RX_IO_DATA_REG); + + if (netif_msg_rx_status(db)) + dev_dbg(db->dev, "rxhdr: %x\n", *((int *)(&rxhdr))); + + rxlen = EMAC_RX_IO_DATA_LEN(rxhdr); + rxstatus = EMAC_RX_IO_DATA_STATUS(rxhdr); + + if (netif_msg_rx_status(db)) + dev_dbg(db->dev, "RX: status %02x, length %04x\n", + rxstatus, rxlen); + + /* Packet Status check */ + if (rxlen < 0x40) { + good_packet = false; + if (netif_msg_rx_err(db)) + dev_dbg(db->dev, "RX: Bad Packet (runt)\n"); + } + + if (unlikely(!(rxstatus & EMAC_RX_IO_DATA_STATUS_OK))) { + good_packet = false; + + if (rxstatus & EMAC_RX_IO_DATA_STATUS_CRC_ERR) { + if (netif_msg_rx_err(db)) + dev_dbg(db->dev, "crc error\n"); + dev->stats.rx_crc_errors++; + } + + if (rxstatus & EMAC_RX_IO_DATA_STATUS_LEN_ERR) { + if (netif_msg_rx_err(db)) + dev_dbg(db->dev, "length error\n"); + dev->stats.rx_length_errors++; + } + } + + /* Move data from EMAC */ + if (good_packet) { + skb = netdev_alloc_skb(dev, rxlen + 4); + if (!skb) + continue; + skb_reserve(skb, 2); + rdptr = skb_put(skb, rxlen - 4); + + /* Read received packet from RX SRAM */ + if (netif_msg_rx_status(db)) + dev_dbg(db->dev, "RxLen %x\n", rxlen); + + if (rxlen >= dev->mtu && db->rx_chan) { + reg_val = readl(db->membase + EMAC_RX_CTL_REG); + reg_val |= EMAC_RX_CTL_DMA_EN; + writel(reg_val, db->membase + EMAC_RX_CTL_REG); + if (!emac_dma_inblk_32bit(db, skb, rdptr, rxlen)) + break; + + /* re enable cpu receive. then try to receive by emac_inblk_32bit */ + reg_val = readl(db->membase + EMAC_RX_CTL_REG); + reg_val &= ~EMAC_RX_CTL_DMA_EN; + writel(reg_val, db->membase + EMAC_RX_CTL_REG); + } + + emac_inblk_32bit(db->membase + EMAC_RX_IO_DATA_REG, + rdptr, rxlen); + dev->stats.rx_bytes += rxlen; + + /* Pass to upper layer */ + skb->protocol = eth_type_trans(skb, dev); + netif_rx(skb); + dev->stats.rx_packets++; + } + } +} + +static irqreturn_t emac_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = dev_id; + struct emac_board_info *db = netdev_priv(dev); + int int_status; + unsigned int reg_val; + + /* A real interrupt coming */ + + spin_lock(&db->lock); + + /* Disable all interrupts */ + writel(0, db->membase + EMAC_INT_CTL_REG); + + /* Got EMAC interrupt status */ + /* Got ISR */ + int_status = readl(db->membase + EMAC_INT_STA_REG); + /* Clear ISR status */ + writel(int_status, db->membase + EMAC_INT_STA_REG); + + if (netif_msg_intr(db)) + dev_dbg(db->dev, "emac interrupt %02x\n", int_status); + + /* Received the coming packet */ + if ((int_status & 0x100) && (db->emacrx_completed_flag == 1)) { + /* carrier lost */ + db->emacrx_completed_flag = 0; + emac_rx(dev); + } + + /* Transmit Interrupt check */ + if (int_status & EMAC_INT_STA_TX_COMPLETE) + emac_tx_done(dev, db, int_status); + + if (int_status & EMAC_INT_STA_TX_ABRT) + netdev_info(dev, " ab : %x\n", int_status); + + /* Re-enable interrupt mask */ + if (db->emacrx_completed_flag == 1) { + reg_val = readl(db->membase + EMAC_INT_CTL_REG); + reg_val |= (EMAC_INT_CTL_TX_EN | EMAC_INT_CTL_TX_ABRT_EN | EMAC_INT_CTL_RX_EN); + writel(reg_val, db->membase + EMAC_INT_CTL_REG); + } else { + reg_val = readl(db->membase + EMAC_INT_CTL_REG); + reg_val |= (EMAC_INT_CTL_TX_EN | EMAC_INT_CTL_TX_ABRT_EN); + writel(reg_val, db->membase + EMAC_INT_CTL_REG); + } + + spin_unlock(&db->lock); + + return IRQ_HANDLED; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +/* + * Used by netconsole + */ +static void emac_poll_controller(struct net_device *dev) +{ + disable_irq(dev->irq); + emac_interrupt(dev->irq, dev); + enable_irq(dev->irq); +} +#endif + +/* Open the interface. + * The interface is opened whenever "ifconfig" actives it. + */ +static int emac_open(struct net_device *dev) +{ + struct emac_board_info *db = netdev_priv(dev); + int ret; + + if (netif_msg_ifup(db)) + dev_dbg(db->dev, "enabling %s\n", dev->name); + + if (request_irq(dev->irq, &emac_interrupt, 0, dev->name, dev)) + return -EAGAIN; + + /* Initialize EMAC board */ + emac_reset(db); + emac_init_device(dev); + + ret = emac_mdio_probe(dev); + if (ret < 0) { + free_irq(dev->irq, dev); + netdev_err(dev, "cannot probe MDIO bus\n"); + return ret; + } + + phy_start(dev->phydev); + netif_start_queue(dev); + + return 0; +} + +static void emac_shutdown(struct net_device *dev) +{ + unsigned int reg_val; + struct emac_board_info *db = netdev_priv(dev); + + /* Disable all interrupt */ + writel(0, db->membase + EMAC_INT_CTL_REG); + + /* clear interrupt status */ + reg_val = readl(db->membase + EMAC_INT_STA_REG); + writel(reg_val, db->membase + EMAC_INT_STA_REG); + + /* Disable RX/TX */ + reg_val = readl(db->membase + EMAC_CTL_REG); + reg_val &= ~(EMAC_CTL_TX_EN | EMAC_CTL_RX_EN | EMAC_CTL_RESET); + writel(reg_val, db->membase + EMAC_CTL_REG); +} + +/* Stop the interface. + * The interface is stopped when it is brought. + */ +static int emac_stop(struct net_device *ndev) +{ + struct emac_board_info *db = netdev_priv(ndev); + + if (netif_msg_ifdown(db)) + dev_dbg(db->dev, "shutting down %s\n", ndev->name); + + netif_stop_queue(ndev); + netif_carrier_off(ndev); + + phy_stop(ndev->phydev); + + emac_mdio_remove(ndev); + + emac_shutdown(ndev); + + free_irq(ndev->irq, ndev); + + return 0; +} + +static const struct net_device_ops emac_netdev_ops = { + .ndo_open = emac_open, + .ndo_stop = emac_stop, + .ndo_start_xmit = emac_start_xmit, + .ndo_tx_timeout = emac_timeout, + .ndo_set_rx_mode = emac_set_rx_mode, + .ndo_eth_ioctl = phy_do_ioctl_running, + .ndo_validate_addr = eth_validate_addr, + .ndo_set_mac_address = emac_set_mac_address, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = emac_poll_controller, +#endif +}; + +static int emac_configure_dma(struct emac_board_info *db) +{ + struct platform_device *pdev = db->pdev; + struct net_device *ndev = db->ndev; + struct dma_slave_config conf = {}; + struct resource *regs; + int err = 0; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) { + netdev_err(ndev, "get io resource from device failed.\n"); + err = -ENOMEM; + goto out_clear_chan; + } + + netdev_info(ndev, "get io resource from device: %pa, size = %u\n", + ®s->start, (unsigned int)resource_size(regs)); + db->emac_rx_fifo = regs->start + EMAC_RX_IO_DATA_REG; + + db->rx_chan = dma_request_chan(&pdev->dev, "rx"); + if (IS_ERR(db->rx_chan)) { + netdev_err(ndev, + "failed to request dma channel. dma is disabled\n"); + err = PTR_ERR(db->rx_chan); + goto out_clear_chan; + } + + conf.direction = DMA_DEV_TO_MEM; + conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + conf.src_addr = db->emac_rx_fifo; + conf.dst_maxburst = 4; + conf.src_maxburst = 4; + conf.device_fc = false; + + err = dmaengine_slave_config(db->rx_chan, &conf); + if (err) { + netdev_err(ndev, "config dma slave failed\n"); + err = -EINVAL; + goto out_slave_configure_err; + } + + return err; + +out_slave_configure_err: + dma_release_channel(db->rx_chan); + +out_clear_chan: + db->rx_chan = NULL; + return err; +} + +/* Search EMAC board, allocate space and register it + */ +static int emac_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct emac_board_info *db; + struct net_device *ndev; + int ret = 0; + + ndev = alloc_etherdev(sizeof(struct emac_board_info)); + if (!ndev) { + dev_err(&pdev->dev, "could not allocate device.\n"); + return -ENOMEM; + } + + SET_NETDEV_DEV(ndev, &pdev->dev); + + db = netdev_priv(ndev); + + db->dev = &pdev->dev; + db->ndev = ndev; + db->pdev = pdev; + db->msg_enable = netif_msg_init(debug, EMAC_DEFAULT_MSG_ENABLE); + + spin_lock_init(&db->lock); + + db->membase = of_iomap(np, 0); + if (!db->membase) { + dev_err(&pdev->dev, "failed to remap registers\n"); + ret = -ENOMEM; + goto out; + } + + /* fill in parameters for net-dev structure */ + ndev->base_addr = (unsigned long)db->membase; + ndev->irq = irq_of_parse_and_map(np, 0); + if (ndev->irq == -ENXIO) { + netdev_err(ndev, "No irq resource\n"); + ret = ndev->irq; + goto out_iounmap; + } + + if (emac_configure_dma(db)) + netdev_info(ndev, "configure dma failed. disable dma.\n"); + + db->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(db->clk)) { + ret = PTR_ERR(db->clk); + goto out_dispose_mapping; + } + + ret = clk_prepare_enable(db->clk); + if (ret) { + dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret); + goto out_dispose_mapping; + } + + ret = sunxi_sram_claim(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "Error couldn't map SRAM to device\n"); + goto out_clk_disable_unprepare; + } + + db->phy_node = of_parse_phandle(np, "phy-handle", 0); + if (!db->phy_node) + db->phy_node = of_parse_phandle(np, "phy", 0); + if (!db->phy_node) { + dev_err(&pdev->dev, "no associated PHY\n"); + ret = -ENODEV; + goto out_release_sram; + } + + /* Read MAC-address from DT */ + ret = of_get_ethdev_address(np, ndev); + if (ret) { + /* if the MAC address is invalid get a random one */ + eth_hw_addr_random(ndev); + dev_warn(&pdev->dev, "using random MAC address %pM\n", + ndev->dev_addr); + } + + db->emacrx_completed_flag = 1; + emac_powerup(ndev); + emac_reset(db); + + ndev->netdev_ops = &emac_netdev_ops; + ndev->watchdog_timeo = msecs_to_jiffies(watchdog); + ndev->ethtool_ops = &emac_ethtool_ops; + + platform_set_drvdata(pdev, ndev); + + /* Carrier starts down, phylib will bring it up */ + netif_carrier_off(ndev); + + ret = register_netdev(ndev); + if (ret) { + dev_err(&pdev->dev, "Registering netdev failed!\n"); + ret = -ENODEV; + goto out_release_sram; + } + + dev_info(&pdev->dev, "%s: at %p, IRQ %d MAC: %pM\n", + ndev->name, db->membase, ndev->irq, ndev->dev_addr); + + return 0; + +out_release_sram: + sunxi_sram_release(&pdev->dev); +out_clk_disable_unprepare: + clk_disable_unprepare(db->clk); +out_dispose_mapping: + irq_dispose_mapping(ndev->irq); + dma_release_channel(db->rx_chan); +out_iounmap: + iounmap(db->membase); +out: + dev_err(db->dev, "not found (%d).\n", ret); + + free_netdev(ndev); + + return ret; +} + +static int emac_remove(struct platform_device *pdev) +{ + struct net_device *ndev = platform_get_drvdata(pdev); + struct emac_board_info *db = netdev_priv(ndev); + + if (db->rx_chan) { + dmaengine_terminate_all(db->rx_chan); + dma_release_channel(db->rx_chan); + } + + unregister_netdev(ndev); + sunxi_sram_release(&pdev->dev); + clk_disable_unprepare(db->clk); + irq_dispose_mapping(ndev->irq); + iounmap(db->membase); + free_netdev(ndev); + + dev_dbg(&pdev->dev, "released and freed device\n"); + return 0; +} + +static int emac_suspend(struct platform_device *dev, pm_message_t state) +{ + struct net_device *ndev = platform_get_drvdata(dev); + + netif_carrier_off(ndev); + netif_device_detach(ndev); + emac_shutdown(ndev); + + return 0; +} + +static int emac_resume(struct platform_device *dev) +{ + struct net_device *ndev = platform_get_drvdata(dev); + struct emac_board_info *db = netdev_priv(ndev); + + emac_reset(db); + emac_init_device(ndev); + netif_device_attach(ndev); + + return 0; +} + +static const struct of_device_id emac_of_match[] = { + {.compatible = "allwinner,sun4i-a10-emac",}, + + /* Deprecated */ + {.compatible = "allwinner,sun4i-emac",}, + {}, +}; + +MODULE_DEVICE_TABLE(of, emac_of_match); + +static struct platform_driver emac_driver = { + .driver = { + .name = "sun4i-emac", + .of_match_table = emac_of_match, + }, + .probe = emac_probe, + .remove = emac_remove, + .suspend = emac_suspend, + .resume = emac_resume, +}; + +module_platform_driver(emac_driver); + +MODULE_AUTHOR("Stefan Roese <sr@denx.de>"); +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); +MODULE_DESCRIPTION("Allwinner A10 emac network driver"); +MODULE_LICENSE("GPL"); |