diff options
Diffstat (limited to 'drivers/net/ethernet/freescale/fec.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/fec.c | 1728 |
1 files changed, 1728 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c new file mode 100644 index 000000000000..1124ce0a1594 --- /dev/null +++ b/drivers/net/ethernet/freescale/fec.c @@ -0,0 +1,1728 @@ +/* + * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx. + * Copyright (c) 1997 Dan Malek (dmalek@jlc.net) + * + * Right now, I am very wasteful with the buffers. I allocate memory + * pages and then divide them into 2K frame buffers. This way I know I + * have buffers large enough to hold one frame within one buffer descriptor. + * Once I get this working, I will use 64 or 128 byte CPM buffers, which + * will be much more memory efficient and will easily handle lots of + * small packets. + * + * Much better multiple PHY support by Magnus Damm. + * Copyright (c) 2000 Ericsson Radio Systems AB. + * + * Support for FEC controller of ColdFire processors. + * Copyright (c) 2001-2005 Greg Ungerer (gerg@snapgear.com) + * + * Bug fixes and cleanup by Philippe De Muyter (phdm@macqel.be) + * Copyright (c) 2004-2006 Macq Electronique SA. + * + * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ptrace.h> +#include <linux/errno.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#include <linux/spinlock.h> +#include <linux/workqueue.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/clk.h> +#include <linux/platform_device.h> +#include <linux/phy.h> +#include <linux/fec.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> +#include <linux/of_net.h> + +#include <asm/cacheflush.h> + +#ifndef CONFIG_ARM +#include <asm/coldfire.h> +#include <asm/mcfsim.h> +#endif + +#include "fec.h" + +#if defined(CONFIG_ARM) +#define FEC_ALIGNMENT 0xf +#else +#define FEC_ALIGNMENT 0x3 +#endif + +#define DRIVER_NAME "fec" + +/* Controller is ENET-MAC */ +#define FEC_QUIRK_ENET_MAC (1 << 0) +/* Controller needs driver to swap frame */ +#define FEC_QUIRK_SWAP_FRAME (1 << 1) +/* Controller uses gasket */ +#define FEC_QUIRK_USE_GASKET (1 << 2) +/* Controller has GBIT support */ +#define FEC_QUIRK_HAS_GBIT (1 << 3) + +static struct platform_device_id fec_devtype[] = { + { + /* keep it for coldfire */ + .name = DRIVER_NAME, + .driver_data = 0, + }, { + .name = "imx25-fec", + .driver_data = FEC_QUIRK_USE_GASKET, + }, { + .name = "imx27-fec", + .driver_data = 0, + }, { + .name = "imx28-fec", + .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_SWAP_FRAME, + }, { + .name = "imx6q-fec", + .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(platform, fec_devtype); + +enum imx_fec_type { + IMX25_FEC = 1, /* runs on i.mx25/50/53 */ + IMX27_FEC, /* runs on i.mx27/35/51 */ + IMX28_FEC, + IMX6Q_FEC, +}; + +static const struct of_device_id fec_dt_ids[] = { + { .compatible = "fsl,imx25-fec", .data = &fec_devtype[IMX25_FEC], }, + { .compatible = "fsl,imx27-fec", .data = &fec_devtype[IMX27_FEC], }, + { .compatible = "fsl,imx28-fec", .data = &fec_devtype[IMX28_FEC], }, + { .compatible = "fsl,imx6q-fec", .data = &fec_devtype[IMX6Q_FEC], }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fec_dt_ids); + +static unsigned char macaddr[ETH_ALEN]; +module_param_array(macaddr, byte, NULL, 0); +MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address"); + +#if defined(CONFIG_M5272) +/* + * Some hardware gets it MAC address out of local flash memory. + * if this is non-zero then assume it is the address to get MAC from. + */ +#if defined(CONFIG_NETtel) +#define FEC_FLASHMAC 0xf0006006 +#elif defined(CONFIG_GILBARCONAP) || defined(CONFIG_SCALES) +#define FEC_FLASHMAC 0xf0006000 +#elif defined(CONFIG_CANCam) +#define FEC_FLASHMAC 0xf0020000 +#elif defined (CONFIG_M5272C3) +#define FEC_FLASHMAC (0xffe04000 + 4) +#elif defined(CONFIG_MOD5272) +#define FEC_FLASHMAC 0xffc0406b +#else +#define FEC_FLASHMAC 0 +#endif +#endif /* CONFIG_M5272 */ + +/* The number of Tx and Rx buffers. These are allocated from the page + * pool. The code may assume these are power of two, so it it best + * to keep them that size. + * We don't need to allocate pages for the transmitter. We just use + * the skbuffer directly. + */ +#define FEC_ENET_RX_PAGES 8 +#define FEC_ENET_RX_FRSIZE 2048 +#define FEC_ENET_RX_FRPPG (PAGE_SIZE / FEC_ENET_RX_FRSIZE) +#define RX_RING_SIZE (FEC_ENET_RX_FRPPG * FEC_ENET_RX_PAGES) +#define FEC_ENET_TX_FRSIZE 2048 +#define FEC_ENET_TX_FRPPG (PAGE_SIZE / FEC_ENET_TX_FRSIZE) +#define TX_RING_SIZE 16 /* Must be power of two */ +#define TX_RING_MOD_MASK 15 /* for this to work */ + +#if (((RX_RING_SIZE + TX_RING_SIZE) * 8) > PAGE_SIZE) +#error "FEC: descriptor ring size constants too large" +#endif + +/* Interrupt events/masks. */ +#define FEC_ENET_HBERR ((uint)0x80000000) /* Heartbeat error */ +#define FEC_ENET_BABR ((uint)0x40000000) /* Babbling receiver */ +#define FEC_ENET_BABT ((uint)0x20000000) /* Babbling transmitter */ +#define FEC_ENET_GRA ((uint)0x10000000) /* Graceful stop complete */ +#define FEC_ENET_TXF ((uint)0x08000000) /* Full frame transmitted */ +#define FEC_ENET_TXB ((uint)0x04000000) /* A buffer was transmitted */ +#define FEC_ENET_RXF ((uint)0x02000000) /* Full frame received */ +#define FEC_ENET_RXB ((uint)0x01000000) /* A buffer was received */ +#define FEC_ENET_MII ((uint)0x00800000) /* MII interrupt */ +#define FEC_ENET_EBERR ((uint)0x00400000) /* SDMA bus error */ + +#define FEC_DEFAULT_IMASK (FEC_ENET_TXF | FEC_ENET_RXF | FEC_ENET_MII) + +/* The FEC stores dest/src/type, data, and checksum for receive packets. + */ +#define PKT_MAXBUF_SIZE 1518 +#define PKT_MINBUF_SIZE 64 +#define PKT_MAXBLR_SIZE 1520 + +/* This device has up to three irqs on some platforms */ +#define FEC_IRQ_NUM 3 + +/* + * The 5270/5271/5280/5282/532x RX control register also contains maximum frame + * size bits. Other FEC hardware does not, so we need to take that into + * account when setting it. + */ +#if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \ + defined(CONFIG_M520x) || defined(CONFIG_M532x) || defined(CONFIG_ARM) +#define OPT_FRAME_SIZE (PKT_MAXBUF_SIZE << 16) +#else +#define OPT_FRAME_SIZE 0 +#endif + +/* The FEC buffer descriptors track the ring buffers. The rx_bd_base and + * tx_bd_base always point to the base of the buffer descriptors. The + * cur_rx and cur_tx point to the currently available buffer. + * The dirty_tx tracks the current buffer that is being sent by the + * controller. The cur_tx and dirty_tx are equal under both completely + * empty and completely full conditions. The empty/ready indicator in + * the buffer descriptor determines the actual condition. + */ +struct fec_enet_private { + /* Hardware registers of the FEC device */ + void __iomem *hwp; + + struct net_device *netdev; + + struct clk *clk; + + /* The saved address of a sent-in-place packet/buffer, for skfree(). */ + unsigned char *tx_bounce[TX_RING_SIZE]; + struct sk_buff* tx_skbuff[TX_RING_SIZE]; + struct sk_buff* rx_skbuff[RX_RING_SIZE]; + ushort skb_cur; + ushort skb_dirty; + + /* CPM dual port RAM relative addresses */ + dma_addr_t bd_dma; + /* Address of Rx and Tx buffers */ + struct bufdesc *rx_bd_base; + struct bufdesc *tx_bd_base; + /* The next free ring entry */ + struct bufdesc *cur_rx, *cur_tx; + /* The ring entries to be free()ed */ + struct bufdesc *dirty_tx; + + uint tx_full; + /* hold while accessing the HW like ringbuffer for tx/rx but not MAC */ + spinlock_t hw_lock; + + struct platform_device *pdev; + + int opened; + + /* Phylib and MDIO interface */ + struct mii_bus *mii_bus; + struct phy_device *phy_dev; + int mii_timeout; + uint phy_speed; + phy_interface_t phy_interface; + int link; + int full_duplex; + struct completion mdio_done; + int irq[FEC_IRQ_NUM]; +}; + +/* FEC MII MMFR bits definition */ +#define FEC_MMFR_ST (1 << 30) +#define FEC_MMFR_OP_READ (2 << 28) +#define FEC_MMFR_OP_WRITE (1 << 28) +#define FEC_MMFR_PA(v) ((v & 0x1f) << 23) +#define FEC_MMFR_RA(v) ((v & 0x1f) << 18) +#define FEC_MMFR_TA (2 << 16) +#define FEC_MMFR_DATA(v) (v & 0xffff) + +#define FEC_MII_TIMEOUT 1000 /* us */ + +/* Transmitter timeout */ +#define TX_TIMEOUT (2 * HZ) + +static void *swap_buffer(void *bufaddr, int len) +{ + int i; + unsigned int *buf = bufaddr; + + for (i = 0; i < (len + 3) / 4; i++, buf++) + *buf = cpu_to_be32(*buf); + + return bufaddr; +} + +static netdev_tx_t +fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + const struct platform_device_id *id_entry = + platform_get_device_id(fep->pdev); + struct bufdesc *bdp; + void *bufaddr; + unsigned short status; + unsigned long flags; + + if (!fep->link) { + /* Link is down or autonegotiation is in progress. */ + return NETDEV_TX_BUSY; + } + + spin_lock_irqsave(&fep->hw_lock, flags); + /* Fill in a Tx ring entry */ + bdp = fep->cur_tx; + + status = bdp->cbd_sc; + + if (status & BD_ENET_TX_READY) { + /* Ooops. All transmit buffers are full. Bail out. + * This should not happen, since ndev->tbusy should be set. + */ + printk("%s: tx queue full!.\n", ndev->name); + spin_unlock_irqrestore(&fep->hw_lock, flags); + return NETDEV_TX_BUSY; + } + + /* Clear all of the status flags */ + status &= ~BD_ENET_TX_STATS; + + /* Set buffer length and buffer pointer */ + bufaddr = skb->data; + bdp->cbd_datlen = skb->len; + + /* + * On some FEC implementations data must be aligned on + * 4-byte boundaries. Use bounce buffers to copy data + * and get it aligned. Ugh. + */ + if (((unsigned long) bufaddr) & FEC_ALIGNMENT) { + unsigned int index; + index = bdp - fep->tx_bd_base; + memcpy(fep->tx_bounce[index], skb->data, skb->len); + bufaddr = fep->tx_bounce[index]; + } + + /* + * Some design made an incorrect assumption on endian mode of + * the system that it's running on. As the result, driver has to + * swap every frame going to and coming from the controller. + */ + if (id_entry->driver_data & FEC_QUIRK_SWAP_FRAME) + swap_buffer(bufaddr, skb->len); + + /* Save skb pointer */ + fep->tx_skbuff[fep->skb_cur] = skb; + + ndev->stats.tx_bytes += skb->len; + fep->skb_cur = (fep->skb_cur+1) & TX_RING_MOD_MASK; + + /* Push the data cache so the CPM does not get stale memory + * data. + */ + bdp->cbd_bufaddr = dma_map_single(&fep->pdev->dev, bufaddr, + FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE); + + /* Send it on its way. Tell FEC it's ready, interrupt when done, + * it's the last BD of the frame, and to put the CRC on the end. + */ + status |= (BD_ENET_TX_READY | BD_ENET_TX_INTR + | BD_ENET_TX_LAST | BD_ENET_TX_TC); + bdp->cbd_sc = status; + + /* Trigger transmission start */ + writel(0, fep->hwp + FEC_X_DES_ACTIVE); + + /* If this was the last BD in the ring, start at the beginning again. */ + if (status & BD_ENET_TX_WRAP) + bdp = fep->tx_bd_base; + else + bdp++; + + if (bdp == fep->dirty_tx) { + fep->tx_full = 1; + netif_stop_queue(ndev); + } + + fep->cur_tx = bdp; + + skb_tx_timestamp(skb); + + spin_unlock_irqrestore(&fep->hw_lock, flags); + + return NETDEV_TX_OK; +} + +/* This function is called to start or restart the FEC during a link + * change. This only happens when switching between half and full + * duplex. + */ +static void +fec_restart(struct net_device *ndev, int duplex) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + const struct platform_device_id *id_entry = + platform_get_device_id(fep->pdev); + int i; + u32 temp_mac[2]; + u32 rcntl = OPT_FRAME_SIZE | 0x04; + u32 ecntl = 0x2; /* ETHEREN */ + + /* Whack a reset. We should wait for this. */ + writel(1, fep->hwp + FEC_ECNTRL); + udelay(10); + + /* + * enet-mac reset will reset mac address registers too, + * so need to reconfigure it. + */ + if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) { + memcpy(&temp_mac, ndev->dev_addr, ETH_ALEN); + writel(cpu_to_be32(temp_mac[0]), fep->hwp + FEC_ADDR_LOW); + writel(cpu_to_be32(temp_mac[1]), fep->hwp + FEC_ADDR_HIGH); + } + + /* Clear any outstanding interrupt. */ + writel(0xffc00000, fep->hwp + FEC_IEVENT); + + /* Reset all multicast. */ + writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); + writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW); +#ifndef CONFIG_M5272 + writel(0, fep->hwp + FEC_HASH_TABLE_HIGH); + writel(0, fep->hwp + FEC_HASH_TABLE_LOW); +#endif + + /* Set maximum receive buffer size. */ + writel(PKT_MAXBLR_SIZE, fep->hwp + FEC_R_BUFF_SIZE); + + /* Set receive and transmit descriptor base. */ + writel(fep->bd_dma, fep->hwp + FEC_R_DES_START); + writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc) * RX_RING_SIZE, + fep->hwp + FEC_X_DES_START); + + fep->dirty_tx = fep->cur_tx = fep->tx_bd_base; + fep->cur_rx = fep->rx_bd_base; + + /* Reset SKB transmit buffers. */ + fep->skb_cur = fep->skb_dirty = 0; + for (i = 0; i <= TX_RING_MOD_MASK; i++) { + if (fep->tx_skbuff[i]) { + dev_kfree_skb_any(fep->tx_skbuff[i]); + fep->tx_skbuff[i] = NULL; + } + } + + /* Enable MII mode */ + if (duplex) { + /* FD enable */ + writel(0x04, fep->hwp + FEC_X_CNTRL); + } else { + /* No Rcv on Xmit */ + rcntl |= 0x02; + writel(0x0, fep->hwp + FEC_X_CNTRL); + } + + fep->full_duplex = duplex; + + /* Set MII speed */ + writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED); + + /* + * The phy interface and speed need to get configured + * differently on enet-mac. + */ + if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) { + /* Enable flow control and length check */ + rcntl |= 0x40000000 | 0x00000020; + + /* RGMII, RMII or MII */ + if (fep->phy_interface == PHY_INTERFACE_MODE_RGMII) + rcntl |= (1 << 6); + else if (fep->phy_interface == PHY_INTERFACE_MODE_RMII) + rcntl |= (1 << 8); + else + rcntl &= ~(1 << 8); + + /* 1G, 100M or 10M */ + if (fep->phy_dev) { + if (fep->phy_dev->speed == SPEED_1000) + ecntl |= (1 << 5); + else if (fep->phy_dev->speed == SPEED_100) + rcntl &= ~(1 << 9); + else + rcntl |= (1 << 9); + } + } else { +#ifdef FEC_MIIGSK_ENR + if (id_entry->driver_data & FEC_QUIRK_USE_GASKET) { + /* disable the gasket and wait */ + writel(0, fep->hwp + FEC_MIIGSK_ENR); + while (readl(fep->hwp + FEC_MIIGSK_ENR) & 4) + udelay(1); + + /* + * configure the gasket: + * RMII, 50 MHz, no loopback, no echo + * MII, 25 MHz, no loopback, no echo + */ + writel((fep->phy_interface == PHY_INTERFACE_MODE_RMII) ? + 1 : 0, fep->hwp + FEC_MIIGSK_CFGR); + + + /* re-enable the gasket */ + writel(2, fep->hwp + FEC_MIIGSK_ENR); + } +#endif + } + writel(rcntl, fep->hwp + FEC_R_CNTRL); + + if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) { + /* enable ENET endian swap */ + ecntl |= (1 << 8); + /* enable ENET store and forward mode */ + writel(1 << 8, fep->hwp + FEC_X_WMRK); + } + + /* And last, enable the transmit and receive processing */ + writel(ecntl, fep->hwp + FEC_ECNTRL); + writel(0, fep->hwp + FEC_R_DES_ACTIVE); + + /* Enable interrupts we wish to service */ + writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK); +} + +static void +fec_stop(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + const struct platform_device_id *id_entry = + platform_get_device_id(fep->pdev); + + /* We cannot expect a graceful transmit stop without link !!! */ + if (fep->link) { + writel(1, fep->hwp + FEC_X_CNTRL); /* Graceful transmit stop */ + udelay(10); + if (!(readl(fep->hwp + FEC_IEVENT) & FEC_ENET_GRA)) + printk("fec_stop : Graceful transmit stop did not complete !\n"); + } + + /* Whack a reset. We should wait for this. */ + writel(1, fep->hwp + FEC_ECNTRL); + udelay(10); + writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED); + writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK); + + /* We have to keep ENET enabled to have MII interrupt stay working */ + if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) + writel(2, fep->hwp + FEC_ECNTRL); +} + + +static void +fec_timeout(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + + ndev->stats.tx_errors++; + + fec_restart(ndev, fep->full_duplex); + netif_wake_queue(ndev); +} + +static void +fec_enet_tx(struct net_device *ndev) +{ + struct fec_enet_private *fep; + struct bufdesc *bdp; + unsigned short status; + struct sk_buff *skb; + + fep = netdev_priv(ndev); + spin_lock(&fep->hw_lock); + bdp = fep->dirty_tx; + + while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) { + if (bdp == fep->cur_tx && fep->tx_full == 0) + break; + + dma_unmap_single(&fep->pdev->dev, bdp->cbd_bufaddr, + FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE); + bdp->cbd_bufaddr = 0; + + skb = fep->tx_skbuff[fep->skb_dirty]; + /* Check for errors. */ + if (status & (BD_ENET_TX_HB | BD_ENET_TX_LC | + BD_ENET_TX_RL | BD_ENET_TX_UN | + BD_ENET_TX_CSL)) { + ndev->stats.tx_errors++; + if (status & BD_ENET_TX_HB) /* No heartbeat */ + ndev->stats.tx_heartbeat_errors++; + if (status & BD_ENET_TX_LC) /* Late collision */ + ndev->stats.tx_window_errors++; + if (status & BD_ENET_TX_RL) /* Retrans limit */ + ndev->stats.tx_aborted_errors++; + if (status & BD_ENET_TX_UN) /* Underrun */ + ndev->stats.tx_fifo_errors++; + if (status & BD_ENET_TX_CSL) /* Carrier lost */ + ndev->stats.tx_carrier_errors++; + } else { + ndev->stats.tx_packets++; + } + + if (status & BD_ENET_TX_READY) + printk("HEY! Enet xmit interrupt and TX_READY.\n"); + + /* Deferred means some collisions occurred during transmit, + * but we eventually sent the packet OK. + */ + if (status & BD_ENET_TX_DEF) + ndev->stats.collisions++; + + /* Free the sk buffer associated with this last transmit */ + dev_kfree_skb_any(skb); + fep->tx_skbuff[fep->skb_dirty] = NULL; + fep->skb_dirty = (fep->skb_dirty + 1) & TX_RING_MOD_MASK; + + /* Update pointer to next buffer descriptor to be transmitted */ + if (status & BD_ENET_TX_WRAP) + bdp = fep->tx_bd_base; + else + bdp++; + + /* Since we have freed up a buffer, the ring is no longer full + */ + if (fep->tx_full) { + fep->tx_full = 0; + if (netif_queue_stopped(ndev)) + netif_wake_queue(ndev); + } + } + fep->dirty_tx = bdp; + spin_unlock(&fep->hw_lock); +} + + +/* During a receive, the cur_rx points to the current incoming buffer. + * When we update through the ring, if the next incoming buffer has + * not been given to the system, we just set the empty indicator, + * effectively tossing the packet. + */ +static void +fec_enet_rx(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + const struct platform_device_id *id_entry = + platform_get_device_id(fep->pdev); + struct bufdesc *bdp; + unsigned short status; + struct sk_buff *skb; + ushort pkt_len; + __u8 *data; + +#ifdef CONFIG_M532x + flush_cache_all(); +#endif + + spin_lock(&fep->hw_lock); + + /* First, grab all of the stats for the incoming packet. + * These get messed up if we get called due to a busy condition. + */ + bdp = fep->cur_rx; + + while (!((status = bdp->cbd_sc) & BD_ENET_RX_EMPTY)) { + + /* Since we have allocated space to hold a complete frame, + * the last indicator should be set. + */ + if ((status & BD_ENET_RX_LAST) == 0) + printk("FEC ENET: rcv is not +last\n"); + + if (!fep->opened) + goto rx_processing_done; + + /* Check for errors. */ + if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH | BD_ENET_RX_NO | + BD_ENET_RX_CR | BD_ENET_RX_OV)) { + ndev->stats.rx_errors++; + if (status & (BD_ENET_RX_LG | BD_ENET_RX_SH)) { + /* Frame too long or too short. */ + ndev->stats.rx_length_errors++; + } + if (status & BD_ENET_RX_NO) /* Frame alignment */ + ndev->stats.rx_frame_errors++; + if (status & BD_ENET_RX_CR) /* CRC Error */ + ndev->stats.rx_crc_errors++; + if (status & BD_ENET_RX_OV) /* FIFO overrun */ + ndev->stats.rx_fifo_errors++; + } + + /* Report late collisions as a frame error. + * On this error, the BD is closed, but we don't know what we + * have in the buffer. So, just drop this frame on the floor. + */ + if (status & BD_ENET_RX_CL) { + ndev->stats.rx_errors++; + ndev->stats.rx_frame_errors++; + goto rx_processing_done; + } + + /* Process the incoming frame. */ + ndev->stats.rx_packets++; + pkt_len = bdp->cbd_datlen; + ndev->stats.rx_bytes += pkt_len; + data = (__u8*)__va(bdp->cbd_bufaddr); + + dma_unmap_single(&fep->pdev->dev, bdp->cbd_bufaddr, + FEC_ENET_TX_FRSIZE, DMA_FROM_DEVICE); + + if (id_entry->driver_data & FEC_QUIRK_SWAP_FRAME) + swap_buffer(data, pkt_len); + + /* This does 16 byte alignment, exactly what we need. + * The packet length includes FCS, but we don't want to + * include that when passing upstream as it messes up + * bridging applications. + */ + skb = dev_alloc_skb(pkt_len - 4 + NET_IP_ALIGN); + + if (unlikely(!skb)) { + printk("%s: Memory squeeze, dropping packet.\n", + ndev->name); + ndev->stats.rx_dropped++; + } else { + skb_reserve(skb, NET_IP_ALIGN); + skb_put(skb, pkt_len - 4); /* Make room */ + skb_copy_to_linear_data(skb, data, pkt_len - 4); + skb->protocol = eth_type_trans(skb, ndev); + if (!skb_defer_rx_timestamp(skb)) + netif_rx(skb); + } + + bdp->cbd_bufaddr = dma_map_single(&fep->pdev->dev, data, + FEC_ENET_TX_FRSIZE, DMA_FROM_DEVICE); +rx_processing_done: + /* Clear the status flags for this buffer */ + status &= ~BD_ENET_RX_STATS; + + /* Mark the buffer empty */ + status |= BD_ENET_RX_EMPTY; + bdp->cbd_sc = status; + + /* Update BD pointer to next entry */ + if (status & BD_ENET_RX_WRAP) + bdp = fep->rx_bd_base; + else + bdp++; + /* Doing this here will keep the FEC running while we process + * incoming frames. On a heavily loaded network, we should be + * able to keep up at the expense of system resources. + */ + writel(0, fep->hwp + FEC_R_DES_ACTIVE); + } + fep->cur_rx = bdp; + + spin_unlock(&fep->hw_lock); +} + +static irqreturn_t +fec_enet_interrupt(int irq, void *dev_id) +{ + struct net_device *ndev = dev_id; + struct fec_enet_private *fep = netdev_priv(ndev); + uint int_events; + irqreturn_t ret = IRQ_NONE; + + do { + int_events = readl(fep->hwp + FEC_IEVENT); + writel(int_events, fep->hwp + FEC_IEVENT); + + if (int_events & FEC_ENET_RXF) { + ret = IRQ_HANDLED; + fec_enet_rx(ndev); + } + + /* Transmit OK, or non-fatal error. Update the buffer + * descriptors. FEC handles all errors, we just discover + * them as part of the transmit process. + */ + if (int_events & FEC_ENET_TXF) { + ret = IRQ_HANDLED; + fec_enet_tx(ndev); + } + + if (int_events & FEC_ENET_MII) { + ret = IRQ_HANDLED; + complete(&fep->mdio_done); + } + } while (int_events); + + return ret; +} + + + +/* ------------------------------------------------------------------------- */ +static void __inline__ fec_get_mac(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct fec_platform_data *pdata = fep->pdev->dev.platform_data; + unsigned char *iap, tmpaddr[ETH_ALEN]; + + /* + * try to get mac address in following order: + * + * 1) module parameter via kernel command line in form + * fec.macaddr=0x00,0x04,0x9f,0x01,0x30,0xe0 + */ + iap = macaddr; + +#ifdef CONFIG_OF + /* + * 2) from device tree data + */ + if (!is_valid_ether_addr(iap)) { + struct device_node *np = fep->pdev->dev.of_node; + if (np) { + const char *mac = of_get_mac_address(np); + if (mac) + iap = (unsigned char *) mac; + } + } +#endif + + /* + * 3) from flash or fuse (via platform data) + */ + if (!is_valid_ether_addr(iap)) { +#ifdef CONFIG_M5272 + if (FEC_FLASHMAC) + iap = (unsigned char *)FEC_FLASHMAC; +#else + if (pdata) + memcpy(iap, pdata->mac, ETH_ALEN); +#endif + } + + /* + * 4) FEC mac registers set by bootloader + */ + if (!is_valid_ether_addr(iap)) { + *((unsigned long *) &tmpaddr[0]) = + be32_to_cpu(readl(fep->hwp + FEC_ADDR_LOW)); + *((unsigned short *) &tmpaddr[4]) = + be16_to_cpu(readl(fep->hwp + FEC_ADDR_HIGH) >> 16); + iap = &tmpaddr[0]; + } + + memcpy(ndev->dev_addr, iap, ETH_ALEN); + + /* Adjust MAC if using macaddr */ + if (iap == macaddr) + ndev->dev_addr[ETH_ALEN-1] = macaddr[ETH_ALEN-1] + fep->pdev->id; +} + +/* ------------------------------------------------------------------------- */ + +/* + * Phy section + */ +static void fec_enet_adjust_link(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct phy_device *phy_dev = fep->phy_dev; + unsigned long flags; + + int status_change = 0; + + spin_lock_irqsave(&fep->hw_lock, flags); + + /* Prevent a state halted on mii error */ + if (fep->mii_timeout && phy_dev->state == PHY_HALTED) { + phy_dev->state = PHY_RESUMING; + goto spin_unlock; + } + + /* Duplex link change */ + if (phy_dev->link) { + if (fep->full_duplex != phy_dev->duplex) { + fec_restart(ndev, phy_dev->duplex); + status_change = 1; + } + } + + /* Link on or off change */ + if (phy_dev->link != fep->link) { + fep->link = phy_dev->link; + if (phy_dev->link) + fec_restart(ndev, phy_dev->duplex); + else + fec_stop(ndev); + status_change = 1; + } + +spin_unlock: + spin_unlock_irqrestore(&fep->hw_lock, flags); + + if (status_change) + phy_print_status(phy_dev); +} + +static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum) +{ + struct fec_enet_private *fep = bus->priv; + unsigned long time_left; + + fep->mii_timeout = 0; + init_completion(&fep->mdio_done); + + /* start a read op */ + writel(FEC_MMFR_ST | FEC_MMFR_OP_READ | + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) | + FEC_MMFR_TA, fep->hwp + FEC_MII_DATA); + + /* wait for end of transfer */ + time_left = wait_for_completion_timeout(&fep->mdio_done, + usecs_to_jiffies(FEC_MII_TIMEOUT)); + if (time_left == 0) { + fep->mii_timeout = 1; + printk(KERN_ERR "FEC: MDIO read timeout\n"); + return -ETIMEDOUT; + } + + /* return value */ + return FEC_MMFR_DATA(readl(fep->hwp + FEC_MII_DATA)); +} + +static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum, + u16 value) +{ + struct fec_enet_private *fep = bus->priv; + unsigned long time_left; + + fep->mii_timeout = 0; + init_completion(&fep->mdio_done); + + /* start a write op */ + writel(FEC_MMFR_ST | FEC_MMFR_OP_WRITE | + FEC_MMFR_PA(mii_id) | FEC_MMFR_RA(regnum) | + FEC_MMFR_TA | FEC_MMFR_DATA(value), + fep->hwp + FEC_MII_DATA); + + /* wait for end of transfer */ + time_left = wait_for_completion_timeout(&fep->mdio_done, + usecs_to_jiffies(FEC_MII_TIMEOUT)); + if (time_left == 0) { + fep->mii_timeout = 1; + printk(KERN_ERR "FEC: MDIO write timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int fec_enet_mdio_reset(struct mii_bus *bus) +{ + return 0; +} + +static int fec_enet_mii_probe(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + const struct platform_device_id *id_entry = + platform_get_device_id(fep->pdev); + struct phy_device *phy_dev = NULL; + char mdio_bus_id[MII_BUS_ID_SIZE]; + char phy_name[MII_BUS_ID_SIZE + 3]; + int phy_id; + int dev_id = fep->pdev->id; + + fep->phy_dev = NULL; + + /* check for attached phy */ + for (phy_id = 0; (phy_id < PHY_MAX_ADDR); phy_id++) { + if ((fep->mii_bus->phy_mask & (1 << phy_id))) + continue; + if (fep->mii_bus->phy_map[phy_id] == NULL) + continue; + if (fep->mii_bus->phy_map[phy_id]->phy_id == 0) + continue; + if (dev_id--) + continue; + strncpy(mdio_bus_id, fep->mii_bus->id, MII_BUS_ID_SIZE); + break; + } + + if (phy_id >= PHY_MAX_ADDR) { + printk(KERN_INFO "%s: no PHY, assuming direct connection " + "to switch\n", ndev->name); + strncpy(mdio_bus_id, "0", MII_BUS_ID_SIZE); + phy_id = 0; + } + + snprintf(phy_name, MII_BUS_ID_SIZE, PHY_ID_FMT, mdio_bus_id, phy_id); + phy_dev = phy_connect(ndev, phy_name, &fec_enet_adjust_link, 0, + fep->phy_interface); + if (IS_ERR(phy_dev)) { + printk(KERN_ERR "%s: could not attach to PHY\n", ndev->name); + return PTR_ERR(phy_dev); + } + + /* mask with MAC supported features */ + if (id_entry->driver_data & FEC_QUIRK_HAS_GBIT) + phy_dev->supported &= PHY_GBIT_FEATURES; + else + phy_dev->supported &= PHY_BASIC_FEATURES; + + phy_dev->advertising = phy_dev->supported; + + fep->phy_dev = phy_dev; + fep->link = 0; + fep->full_duplex = 0; + + printk(KERN_INFO "%s: Freescale FEC PHY driver [%s] " + "(mii_bus:phy_addr=%s, irq=%d)\n", ndev->name, + fep->phy_dev->drv->name, dev_name(&fep->phy_dev->dev), + fep->phy_dev->irq); + + return 0; +} + +static int fec_enet_mii_init(struct platform_device *pdev) +{ + static struct mii_bus *fec0_mii_bus; + struct net_device *ndev = platform_get_drvdata(pdev); + struct fec_enet_private *fep = netdev_priv(ndev); + const struct platform_device_id *id_entry = + platform_get_device_id(fep->pdev); + int err = -ENXIO, i; + + /* + * The dual fec interfaces are not equivalent with enet-mac. + * Here are the differences: + * + * - fec0 supports MII & RMII modes while fec1 only supports RMII + * - fec0 acts as the 1588 time master while fec1 is slave + * - external phys can only be configured by fec0 + * + * That is to say fec1 can not work independently. It only works + * when fec0 is working. The reason behind this design is that the + * second interface is added primarily for Switch mode. + * + * Because of the last point above, both phys are attached on fec0 + * mdio interface in board design, and need to be configured by + * fec0 mii_bus. + */ + if ((id_entry->driver_data & FEC_QUIRK_ENET_MAC) && pdev->id > 0) { + /* fec1 uses fec0 mii_bus */ + fep->mii_bus = fec0_mii_bus; + return 0; + } + + fep->mii_timeout = 0; + + /* + * Set MII speed to 2.5 MHz (= clk_get_rate() / 2 * phy_speed) + * + * The formula for FEC MDC is 'ref_freq / (MII_SPEED x 2)' while + * for ENET-MAC is 'ref_freq / ((MII_SPEED + 1) x 2)'. The i.MX28 + * Reference Manual has an error on this, and gets fixed on i.MX6Q + * document. + */ + fep->phy_speed = DIV_ROUND_UP(clk_get_rate(fep->clk), 5000000); + if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) + fep->phy_speed--; + fep->phy_speed <<= 1; + writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED); + + fep->mii_bus = mdiobus_alloc(); + if (fep->mii_bus == NULL) { + err = -ENOMEM; + goto err_out; + } + + fep->mii_bus->name = "fec_enet_mii_bus"; + fep->mii_bus->read = fec_enet_mdio_read; + fep->mii_bus->write = fec_enet_mdio_write; + fep->mii_bus->reset = fec_enet_mdio_reset; + snprintf(fep->mii_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id + 1); + fep->mii_bus->priv = fep; + fep->mii_bus->parent = &pdev->dev; + + fep->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL); + if (!fep->mii_bus->irq) { + err = -ENOMEM; + goto err_out_free_mdiobus; + } + + for (i = 0; i < PHY_MAX_ADDR; i++) + fep->mii_bus->irq[i] = PHY_POLL; + + if (mdiobus_register(fep->mii_bus)) + goto err_out_free_mdio_irq; + + /* save fec0 mii_bus */ + if (id_entry->driver_data & FEC_QUIRK_ENET_MAC) + fec0_mii_bus = fep->mii_bus; + + return 0; + +err_out_free_mdio_irq: + kfree(fep->mii_bus->irq); +err_out_free_mdiobus: + mdiobus_free(fep->mii_bus); +err_out: + return err; +} + +static void fec_enet_mii_remove(struct fec_enet_private *fep) +{ + if (fep->phy_dev) + phy_disconnect(fep->phy_dev); + mdiobus_unregister(fep->mii_bus); + kfree(fep->mii_bus->irq); + mdiobus_free(fep->mii_bus); +} + +static int fec_enet_get_settings(struct net_device *ndev, + struct ethtool_cmd *cmd) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct phy_device *phydev = fep->phy_dev; + + if (!phydev) + return -ENODEV; + + return phy_ethtool_gset(phydev, cmd); +} + +static int fec_enet_set_settings(struct net_device *ndev, + struct ethtool_cmd *cmd) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct phy_device *phydev = fep->phy_dev; + + if (!phydev) + return -ENODEV; + + return phy_ethtool_sset(phydev, cmd); +} + +static void fec_enet_get_drvinfo(struct net_device *ndev, + struct ethtool_drvinfo *info) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + + strcpy(info->driver, fep->pdev->dev.driver->name); + strcpy(info->version, "Revision: 1.0"); + strcpy(info->bus_info, dev_name(&ndev->dev)); +} + +static struct ethtool_ops fec_enet_ethtool_ops = { + .get_settings = fec_enet_get_settings, + .set_settings = fec_enet_set_settings, + .get_drvinfo = fec_enet_get_drvinfo, + .get_link = ethtool_op_get_link, +}; + +static int fec_enet_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct phy_device *phydev = fep->phy_dev; + + if (!netif_running(ndev)) + return -EINVAL; + + if (!phydev) + return -ENODEV; + + return phy_mii_ioctl(phydev, rq, cmd); +} + +static void fec_enet_free_buffers(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + int i; + struct sk_buff *skb; + struct bufdesc *bdp; + + bdp = fep->rx_bd_base; + for (i = 0; i < RX_RING_SIZE; i++) { + skb = fep->rx_skbuff[i]; + + if (bdp->cbd_bufaddr) + dma_unmap_single(&fep->pdev->dev, bdp->cbd_bufaddr, + FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE); + if (skb) + dev_kfree_skb(skb); + bdp++; + } + + bdp = fep->tx_bd_base; + for (i = 0; i < TX_RING_SIZE; i++) + kfree(fep->tx_bounce[i]); +} + +static int fec_enet_alloc_buffers(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + int i; + struct sk_buff *skb; + struct bufdesc *bdp; + + bdp = fep->rx_bd_base; + for (i = 0; i < RX_RING_SIZE; i++) { + skb = dev_alloc_skb(FEC_ENET_RX_FRSIZE); + if (!skb) { + fec_enet_free_buffers(ndev); + return -ENOMEM; + } + fep->rx_skbuff[i] = skb; + + bdp->cbd_bufaddr = dma_map_single(&fep->pdev->dev, skb->data, + FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE); + bdp->cbd_sc = BD_ENET_RX_EMPTY; + bdp++; + } + + /* Set the last buffer to wrap. */ + bdp--; + bdp->cbd_sc |= BD_SC_WRAP; + + bdp = fep->tx_bd_base; + for (i = 0; i < TX_RING_SIZE; i++) { + fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL); + + bdp->cbd_sc = 0; + bdp->cbd_bufaddr = 0; + bdp++; + } + + /* Set the last buffer to wrap. */ + bdp--; + bdp->cbd_sc |= BD_SC_WRAP; + + return 0; +} + +static int +fec_enet_open(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + int ret; + + /* I should reset the ring buffers here, but I don't yet know + * a simple way to do that. + */ + + ret = fec_enet_alloc_buffers(ndev); + if (ret) + return ret; + + /* Probe and connect to PHY when open the interface */ + ret = fec_enet_mii_probe(ndev); + if (ret) { + fec_enet_free_buffers(ndev); + return ret; + } + phy_start(fep->phy_dev); + netif_start_queue(ndev); + fep->opened = 1; + return 0; +} + +static int +fec_enet_close(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + + /* Don't know what to do yet. */ + fep->opened = 0; + netif_stop_queue(ndev); + fec_stop(ndev); + + if (fep->phy_dev) { + phy_stop(fep->phy_dev); + phy_disconnect(fep->phy_dev); + } + + fec_enet_free_buffers(ndev); + + return 0; +} + +/* Set or clear the multicast filter for this adaptor. + * Skeleton taken from sunlance driver. + * The CPM Ethernet implementation allows Multicast as well as individual + * MAC address filtering. Some of the drivers check to make sure it is + * a group multicast address, and discard those that are not. I guess I + * will do the same for now, but just remove the test if you want + * individual filtering as well (do the upper net layers want or support + * this kind of feature?). + */ + +#define HASH_BITS 6 /* #bits in hash */ +#define CRC32_POLY 0xEDB88320 + +static void set_multicast_list(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct netdev_hw_addr *ha; + unsigned int i, bit, data, crc, tmp; + unsigned char hash; + + if (ndev->flags & IFF_PROMISC) { + tmp = readl(fep->hwp + FEC_R_CNTRL); + tmp |= 0x8; + writel(tmp, fep->hwp + FEC_R_CNTRL); + return; + } + + tmp = readl(fep->hwp + FEC_R_CNTRL); + tmp &= ~0x8; + writel(tmp, fep->hwp + FEC_R_CNTRL); + + if (ndev->flags & IFF_ALLMULTI) { + /* Catch all multicast addresses, so set the + * filter to all 1's + */ + writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); + writel(0xffffffff, fep->hwp + FEC_GRP_HASH_TABLE_LOW); + + return; + } + + /* Clear filter and add the addresses in hash register + */ + writel(0, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); + writel(0, fep->hwp + FEC_GRP_HASH_TABLE_LOW); + + netdev_for_each_mc_addr(ha, ndev) { + /* calculate crc32 value of mac address */ + crc = 0xffffffff; + + for (i = 0; i < ndev->addr_len; i++) { + data = ha->addr[i]; + for (bit = 0; bit < 8; bit++, data >>= 1) { + crc = (crc >> 1) ^ + (((crc ^ data) & 1) ? CRC32_POLY : 0); + } + } + + /* only upper 6 bits (HASH_BITS) are used + * which point to specific bit in he hash registers + */ + hash = (crc >> (32 - HASH_BITS)) & 0x3f; + + if (hash > 31) { + tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_HIGH); + tmp |= 1 << (hash - 32); + writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_HIGH); + } else { + tmp = readl(fep->hwp + FEC_GRP_HASH_TABLE_LOW); + tmp |= 1 << hash; + writel(tmp, fep->hwp + FEC_GRP_HASH_TABLE_LOW); + } + } +} + +/* Set a MAC change in hardware. */ +static int +fec_set_mac_address(struct net_device *ndev, void *p) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct sockaddr *addr = p; + + if (!is_valid_ether_addr(addr->sa_data)) + return -EADDRNOTAVAIL; + + memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); + + writel(ndev->dev_addr[3] | (ndev->dev_addr[2] << 8) | + (ndev->dev_addr[1] << 16) | (ndev->dev_addr[0] << 24), + fep->hwp + FEC_ADDR_LOW); + writel((ndev->dev_addr[5] << 16) | (ndev->dev_addr[4] << 24), + fep->hwp + FEC_ADDR_HIGH); + return 0; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +/* + * fec_poll_controller: FEC Poll controller function + * @dev: The FEC network adapter + * + * Polled functionality used by netconsole and others in non interrupt mode + * + */ +void fec_poll_controller(struct net_device *dev) +{ + int i; + struct fec_enet_private *fep = netdev_priv(dev); + + for (i = 0; i < FEC_IRQ_NUM; i++) { + if (fep->irq[i] > 0) { + disable_irq(fep->irq[i]); + fec_enet_interrupt(fep->irq[i], dev); + enable_irq(fep->irq[i]); + } + } +} +#endif + +static const struct net_device_ops fec_netdev_ops = { + .ndo_open = fec_enet_open, + .ndo_stop = fec_enet_close, + .ndo_start_xmit = fec_enet_start_xmit, + .ndo_set_rx_mode = set_multicast_list, + .ndo_change_mtu = eth_change_mtu, + .ndo_validate_addr = eth_validate_addr, + .ndo_tx_timeout = fec_timeout, + .ndo_set_mac_address = fec_set_mac_address, + .ndo_do_ioctl = fec_enet_ioctl, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = fec_poll_controller, +#endif +}; + + /* + * XXX: We need to clean up on failure exits here. + * + */ +static int fec_enet_init(struct net_device *ndev) +{ + struct fec_enet_private *fep = netdev_priv(ndev); + struct bufdesc *cbd_base; + struct bufdesc *bdp; + int i; + + /* Allocate memory for buffer descriptors. */ + cbd_base = dma_alloc_coherent(NULL, PAGE_SIZE, &fep->bd_dma, + GFP_KERNEL); + if (!cbd_base) { + printk("FEC: allocate descriptor memory failed?\n"); + return -ENOMEM; + } + + spin_lock_init(&fep->hw_lock); + + fep->netdev = ndev; + + /* Get the Ethernet address */ + fec_get_mac(ndev); + + /* Set receive and transmit descriptor base. */ + fep->rx_bd_base = cbd_base; + fep->tx_bd_base = cbd_base + RX_RING_SIZE; + + /* The FEC Ethernet specific entries in the device structure */ + ndev->watchdog_timeo = TX_TIMEOUT; + ndev->netdev_ops = &fec_netdev_ops; + ndev->ethtool_ops = &fec_enet_ethtool_ops; + + /* Initialize the receive buffer descriptors. */ + bdp = fep->rx_bd_base; + for (i = 0; i < RX_RING_SIZE; i++) { + + /* Initialize the BD for every fragment in the page. */ + bdp->cbd_sc = 0; + bdp++; + } + + /* Set the last buffer to wrap */ + bdp--; + bdp->cbd_sc |= BD_SC_WRAP; + + /* ...and the same for transmit */ + bdp = fep->tx_bd_base; + for (i = 0; i < TX_RING_SIZE; i++) { + + /* Initialize the BD for every fragment in the page. */ + bdp->cbd_sc = 0; + bdp->cbd_bufaddr = 0; + bdp++; + } + + /* Set the last buffer to wrap */ + bdp--; + bdp->cbd_sc |= BD_SC_WRAP; + + fec_restart(ndev, 0); + + return 0; +} + +#ifdef CONFIG_OF +static int __devinit fec_get_phy_mode_dt(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + + if (np) + return of_get_phy_mode(np); + + return -ENODEV; +} + +static void __devinit fec_reset_phy(struct platform_device *pdev) +{ + int err, phy_reset; + struct device_node *np = pdev->dev.of_node; + + if (!np) + return; + + phy_reset = of_get_named_gpio(np, "phy-reset-gpios", 0); + err = gpio_request_one(phy_reset, GPIOF_OUT_INIT_LOW, "phy-reset"); + if (err) { + pr_debug("FEC: failed to get gpio phy-reset: %d\n", err); + return; + } + msleep(1); + gpio_set_value(phy_reset, 1); +} +#else /* CONFIG_OF */ +static inline int fec_get_phy_mode_dt(struct platform_device *pdev) +{ + return -ENODEV; +} + +static inline void fec_reset_phy(struct platform_device *pdev) +{ + /* + * In case of platform probe, the reset has been done + * by machine code. + */ +} +#endif /* CONFIG_OF */ + +static int __devinit +fec_probe(struct platform_device *pdev) +{ + struct fec_enet_private *fep; + struct fec_platform_data *pdata; + struct net_device *ndev; + int i, irq, ret = 0; + struct resource *r; + const struct of_device_id *of_id; + + of_id = of_match_device(fec_dt_ids, &pdev->dev); + if (of_id) + pdev->id_entry = of_id->data; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) + return -ENXIO; + + r = request_mem_region(r->start, resource_size(r), pdev->name); + if (!r) + return -EBUSY; + + /* Init network device */ + ndev = alloc_etherdev(sizeof(struct fec_enet_private)); + if (!ndev) { + ret = -ENOMEM; + goto failed_alloc_etherdev; + } + + SET_NETDEV_DEV(ndev, &pdev->dev); + + /* setup board info structure */ + fep = netdev_priv(ndev); + + fep->hwp = ioremap(r->start, resource_size(r)); + fep->pdev = pdev; + + if (!fep->hwp) { + ret = -ENOMEM; + goto failed_ioremap; + } + + platform_set_drvdata(pdev, ndev); + + ret = fec_get_phy_mode_dt(pdev); + if (ret < 0) { + pdata = pdev->dev.platform_data; + if (pdata) + fep->phy_interface = pdata->phy; + else + fep->phy_interface = PHY_INTERFACE_MODE_MII; + } else { + fep->phy_interface = ret; + } + + fec_reset_phy(pdev); + + for (i = 0; i < FEC_IRQ_NUM; i++) { + irq = platform_get_irq(pdev, i); + if (i && irq < 0) + break; + ret = request_irq(irq, fec_enet_interrupt, IRQF_DISABLED, pdev->name, ndev); + if (ret) { + while (--i >= 0) { + irq = platform_get_irq(pdev, i); + free_irq(irq, ndev); + } + goto failed_irq; + } + } + + fep->clk = clk_get(&pdev->dev, "fec_clk"); + if (IS_ERR(fep->clk)) { + ret = PTR_ERR(fep->clk); + goto failed_clk; + } + clk_enable(fep->clk); + + ret = fec_enet_init(ndev); + if (ret) + goto failed_init; + + ret = fec_enet_mii_init(pdev); + if (ret) + goto failed_mii_init; + + /* Carrier starts down, phylib will bring it up */ + netif_carrier_off(ndev); + + ret = register_netdev(ndev); + if (ret) + goto failed_register; + + return 0; + +failed_register: + fec_enet_mii_remove(fep); +failed_mii_init: +failed_init: + clk_disable(fep->clk); + clk_put(fep->clk); +failed_clk: + for (i = 0; i < FEC_IRQ_NUM; i++) { + irq = platform_get_irq(pdev, i); + if (irq > 0) + free_irq(irq, ndev); + } +failed_irq: + iounmap(fep->hwp); +failed_ioremap: + free_netdev(ndev); +failed_alloc_etherdev: + release_mem_region(r->start, resource_size(r)); + + return ret; +} + +static int __devexit +fec_drv_remove(struct platform_device *pdev) +{ + struct net_device *ndev = platform_get_drvdata(pdev); + struct fec_enet_private *fep = netdev_priv(ndev); + struct resource *r; + + fec_stop(ndev); + fec_enet_mii_remove(fep); + clk_disable(fep->clk); + clk_put(fep->clk); + iounmap(fep->hwp); + unregister_netdev(ndev); + free_netdev(ndev); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + BUG_ON(!r); + release_mem_region(r->start, resource_size(r)); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +#ifdef CONFIG_PM +static int +fec_suspend(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); + struct fec_enet_private *fep = netdev_priv(ndev); + + if (netif_running(ndev)) { + fec_stop(ndev); + netif_device_detach(ndev); + } + clk_disable(fep->clk); + + return 0; +} + +static int +fec_resume(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); + struct fec_enet_private *fep = netdev_priv(ndev); + + clk_enable(fep->clk); + if (netif_running(ndev)) { + fec_restart(ndev, fep->full_duplex); + netif_device_attach(ndev); + } + + return 0; +} + +static const struct dev_pm_ops fec_pm_ops = { + .suspend = fec_suspend, + .resume = fec_resume, + .freeze = fec_suspend, + .thaw = fec_resume, + .poweroff = fec_suspend, + .restore = fec_resume, +}; +#endif + +static struct platform_driver fec_driver = { + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, +#ifdef CONFIG_PM + .pm = &fec_pm_ops, +#endif + .of_match_table = fec_dt_ids, + }, + .id_table = fec_devtype, + .probe = fec_probe, + .remove = __devexit_p(fec_drv_remove), +}; + +static int __init +fec_enet_module_init(void) +{ + printk(KERN_INFO "FEC Ethernet Driver\n"); + + return platform_driver_register(&fec_driver); +} + +static void __exit +fec_enet_cleanup(void) +{ + platform_driver_unregister(&fec_driver); +} + +module_exit(fec_enet_cleanup); +module_init(fec_enet_module_init); + +MODULE_LICENSE("GPL"); |