/* * Blackfin On-Chip MAC Driver * * Copyright 2004-2007 Analog Devices Inc. * * Enter bugs at http://blackfin.uclinux.org/ * * Licensed under the GPL-2 or later. */ #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/timer.h> #include <linux/errno.h> #include <linux/irq.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/crc32.h> #include <linux/device.h> #include <linux/spinlock.h> #include <linux/ethtool.h> #include <linux/mii.h> #include <linux/phy.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/platform_device.h> #include <asm/dma.h> #include <linux/dma-mapping.h> #include <asm/blackfin.h> #include <asm/cacheflush.h> #include <asm/portmux.h> #include "bfin_mac.h" #define DRV_NAME "bfin_mac" #define DRV_VERSION "1.1" #define DRV_AUTHOR "Bryan Wu, Luke Yang" #define DRV_DESC "Blackfin BF53[67] BF527 on-chip Ethernet MAC driver" MODULE_AUTHOR(DRV_AUTHOR); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION(DRV_DESC); #if defined(CONFIG_BFIN_MAC_USE_L1) # define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size) # define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr) #else # define bfin_mac_alloc(dma_handle, size) \ dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL) # define bfin_mac_free(dma_handle, ptr) \ dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle) #endif #define PKT_BUF_SZ 1580 #define MAX_TIMEOUT_CNT 500 /* pointers to maintain transmit list */ static struct net_dma_desc_tx *tx_list_head; static struct net_dma_desc_tx *tx_list_tail; static struct net_dma_desc_rx *rx_list_head; static struct net_dma_desc_rx *rx_list_tail; static struct net_dma_desc_rx *current_rx_ptr; static struct net_dma_desc_tx *current_tx_ptr; static struct net_dma_desc_tx *tx_desc; static struct net_dma_desc_rx *rx_desc; static void bf537mac_disable(void); static void bf537mac_enable(void); static void desc_list_free(void) { struct net_dma_desc_rx *r; struct net_dma_desc_tx *t; int i; #if !defined(CONFIG_BFIN_MAC_USE_L1) dma_addr_t dma_handle = 0; #endif if (tx_desc) { t = tx_list_head; for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) { if (t) { if (t->skb) { dev_kfree_skb(t->skb); t->skb = NULL; } t = t->next; } } bfin_mac_free(dma_handle, tx_desc); } if (rx_desc) { r = rx_list_head; for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) { if (r) { if (r->skb) { dev_kfree_skb(r->skb); r->skb = NULL; } r = r->next; } } bfin_mac_free(dma_handle, rx_desc); } } static int desc_list_init(void) { int i; struct sk_buff *new_skb; #if !defined(CONFIG_BFIN_MAC_USE_L1) /* * This dma_handle is useless in Blackfin dma_alloc_coherent(). * The real dma handler is the return value of dma_alloc_coherent(). */ dma_addr_t dma_handle; #endif tx_desc = bfin_mac_alloc(&dma_handle, sizeof(struct net_dma_desc_tx) * CONFIG_BFIN_TX_DESC_NUM); if (tx_desc == NULL) goto init_error; rx_desc = bfin_mac_alloc(&dma_handle, sizeof(struct net_dma_desc_rx) * CONFIG_BFIN_RX_DESC_NUM); if (rx_desc == NULL) goto init_error; /* init tx_list */ tx_list_head = tx_list_tail = tx_desc; for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) { struct net_dma_desc_tx *t = tx_desc + i; struct dma_descriptor *a = &(t->desc_a); struct dma_descriptor *b = &(t->desc_b); /* * disable DMA * read from memory WNR = 0 * wordsize is 32 bits * 6 half words is desc size * large desc flow */ a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE; a->start_addr = (unsigned long)t->packet; a->x_count = 0; a->next_dma_desc = b; /* * enabled DMA * write to memory WNR = 1 * wordsize is 32 bits * disable interrupt * 6 half words is desc size * large desc flow */ b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE; b->start_addr = (unsigned long)(&(t->status)); b->x_count = 0; t->skb = NULL; tx_list_tail->desc_b.next_dma_desc = a; tx_list_tail->next = t; tx_list_tail = t; } tx_list_tail->next = tx_list_head; /* tx_list is a circle */ tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a); current_tx_ptr = tx_list_head; /* init rx_list */ rx_list_head = rx_list_tail = rx_desc; for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) { struct net_dma_desc_rx *r = rx_desc + i; struct dma_descriptor *a = &(r->desc_a); struct dma_descriptor *b = &(r->desc_b); /* allocate a new skb for next time receive */ new_skb = dev_alloc_skb(PKT_BUF_SZ + 2); if (!new_skb) { printk(KERN_NOTICE DRV_NAME ": init: low on mem - packet dropped\n"); goto init_error; } skb_reserve(new_skb, 2); r->skb = new_skb; /* * enabled DMA * write to memory WNR = 1 * wordsize is 32 bits * disable interrupt * 6 half words is desc size * large desc flow */ a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE; /* since RXDWA is enabled */ a->start_addr = (unsigned long)new_skb->data - 2; a->x_count = 0; a->next_dma_desc = b; /* * enabled DMA * write to memory WNR = 1 * wordsize is 32 bits * enable interrupt * 6 half words is desc size * large desc flow */ b->config = DMAEN | WNR | WDSIZE_32 | DI_EN | NDSIZE_6 | DMAFLOW_LARGE; b->start_addr = (unsigned long)(&(r->status)); b->x_count = 0; rx_list_tail->desc_b.next_dma_desc = a; rx_list_tail->next = r; rx_list_tail = r; } rx_list_tail->next = rx_list_head; /* rx_list is a circle */ rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a); current_rx_ptr = rx_list_head; return 0; init_error: desc_list_free(); printk(KERN_ERR DRV_NAME ": kmalloc failed\n"); return -ENOMEM; } /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/ /* Set FER regs to MUX in Ethernet pins */ static int setup_pin_mux(int action) { #if defined(CONFIG_BFIN_MAC_RMII) u16 pin_req[] = P_RMII0; #else u16 pin_req[] = P_MII0; #endif if (action) { if (peripheral_request_list(pin_req, DRV_NAME)) { printk(KERN_ERR DRV_NAME ": Requesting Peripherals failed\n"); return -EFAULT; } } else peripheral_free_list(pin_req); return 0; } /* * MII operations */ /* Wait until the previous MDC/MDIO transaction has completed */ static void mdio_poll(void) { int timeout_cnt = MAX_TIMEOUT_CNT; /* poll the STABUSY bit */ while ((bfin_read_EMAC_STAADD()) & STABUSY) { udelay(1); if (timeout_cnt-- < 0) { printk(KERN_ERR DRV_NAME ": wait MDC/MDIO transaction to complete timeout\n"); break; } } } /* Read an off-chip register in a PHY through the MDC/MDIO port */ static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum) { mdio_poll(); /* read mode */ bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) | SET_REGAD((u16) regnum) | STABUSY); mdio_poll(); return (int) bfin_read_EMAC_STADAT(); } /* Write an off-chip register in a PHY through the MDC/MDIO port */ static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum, u16 value) { mdio_poll(); bfin_write_EMAC_STADAT((u32) value); /* write mode */ bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) | SET_REGAD((u16) regnum) | STAOP | STABUSY); mdio_poll(); return 0; } static int mdiobus_reset(struct mii_bus *bus) { return 0; } static void bf537_adjust_link(struct net_device *dev) { struct bf537mac_local *lp = netdev_priv(dev); struct phy_device *phydev = lp->phydev; unsigned long flags; int new_state = 0; spin_lock_irqsave(&lp->lock, flags); if (phydev->link) { /* Now we make sure that we can be in full duplex mode. * If not, we operate in half-duplex mode. */ if (phydev->duplex != lp->old_duplex) { u32 opmode = bfin_read_EMAC_OPMODE(); new_state = 1; if (phydev->duplex) opmode |= FDMODE; else opmode &= ~(FDMODE); bfin_write_EMAC_OPMODE(opmode); lp->old_duplex = phydev->duplex; } if (phydev->speed != lp->old_speed) { #if defined(CONFIG_BFIN_MAC_RMII) u32 opmode = bfin_read_EMAC_OPMODE(); switch (phydev->speed) { case 10: opmode |= RMII_10; break; case 100: opmode &= ~(RMII_10); break; default: printk(KERN_WARNING "%s: Ack! Speed (%d) is not 10/100!\n", DRV_NAME, phydev->speed); break; } bfin_write_EMAC_OPMODE(opmode); #endif new_state = 1; lp->old_speed = phydev->speed; } if (!lp->old_link) { new_state = 1; lp->old_link = 1; netif_schedule(dev); } } else if (lp->old_link) { new_state = 1; lp->old_link = 0; lp->old_speed = 0; lp->old_duplex = -1; } if (new_state) { u32 opmode = bfin_read_EMAC_OPMODE(); phy_print_status(phydev); pr_debug("EMAC_OPMODE = 0x%08x\n", opmode); } spin_unlock_irqrestore(&lp->lock, flags); } /* MDC = 2.5 MHz */ #define MDC_CLK 2500000 static int mii_probe(struct net_device *dev) { struct bf537mac_local *lp = netdev_priv(dev); struct phy_device *phydev = NULL; unsigned short sysctl; int i; u32 sclk, mdc_div; /* Enable PHY output early */ if (!(bfin_read_VR_CTL() & PHYCLKOE)) bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE); sclk = get_sclk(); mdc_div = ((sclk / MDC_CLK) / 2) - 1; sysctl = bfin_read_EMAC_SYSCTL(); sysctl = (sysctl & ~MDCDIV) | SET_MDCDIV(mdc_div); bfin_write_EMAC_SYSCTL(sysctl); /* search for connect PHY device */ for (i = 0; i < PHY_MAX_ADDR; i++) { struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i]; if (!tmp_phydev) continue; /* no PHY here... */ phydev = tmp_phydev; break; /* found it */ } /* now we are supposed to have a proper phydev, to attach to... */ if (!phydev) { printk(KERN_INFO "%s: Don't found any phy device at all\n", dev->name); return -ENODEV; } #if defined(CONFIG_BFIN_MAC_RMII) phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0, PHY_INTERFACE_MODE_RMII); #else phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0, PHY_INTERFACE_MODE_MII); #endif if (IS_ERR(phydev)) { printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name); return PTR_ERR(phydev); } /* mask with MAC supported features */ phydev->supported &= (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full | SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full | SUPPORTED_Autoneg | SUPPORTED_Pause | SUPPORTED_Asym_Pause | SUPPORTED_MII | SUPPORTED_TP); phydev->advertising = phydev->supported; lp->old_link = 0; lp->old_speed = 0; lp->old_duplex = -1; lp->phydev = phydev; printk(KERN_INFO "%s: attached PHY driver [%s] " "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)" "@sclk=%dMHz)\n", DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq, MDC_CLK, mdc_div, sclk/1000000); return 0; } /**************************************************************************/ void setup_system_regs(struct net_device *dev) { unsigned short sysctl; /* * Odd word alignment for Receive Frame DMA word * Configure checksum support and rcve frame word alignment */ sysctl = bfin_read_EMAC_SYSCTL(); #if defined(BFIN_MAC_CSUM_OFFLOAD) sysctl |= RXDWA | RXCKS; #else sysctl |= RXDWA; #endif bfin_write_EMAC_SYSCTL(sysctl); bfin_write_EMAC_MMC_CTL(RSTC | CROLL); /* Initialize the TX DMA channel registers */ bfin_write_DMA2_X_COUNT(0); bfin_write_DMA2_X_MODIFY(4); bfin_write_DMA2_Y_COUNT(0); bfin_write_DMA2_Y_MODIFY(0); /* Initialize the RX DMA channel registers */ bfin_write_DMA1_X_COUNT(0); bfin_write_DMA1_X_MODIFY(4); bfin_write_DMA1_Y_COUNT(0); bfin_write_DMA1_Y_MODIFY(0); } static void setup_mac_addr(u8 *mac_addr) { u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]); u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]); /* this depends on a little-endian machine */ bfin_write_EMAC_ADDRLO(addr_low); bfin_write_EMAC_ADDRHI(addr_hi); } static int bf537mac_set_mac_address(struct net_device *dev, void *p) { struct sockaddr *addr = p; if (netif_running(dev)) return -EBUSY; memcpy(dev->dev_addr, addr->sa_data, dev->addr_len); setup_mac_addr(dev->dev_addr); return 0; } static void adjust_tx_list(void) { int timeout_cnt = MAX_TIMEOUT_CNT; if (tx_list_head->status.status_word != 0 && current_tx_ptr != tx_list_head) { goto adjust_head; /* released something, just return; */ } /* * if nothing released, check wait condition * current's next can not be the head, * otherwise the dma will not stop as we want */ if (current_tx_ptr->next->next == tx_list_head) { while (tx_list_head->status.status_word == 0) { mdelay(1); if (tx_list_head->status.status_word != 0 || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) { goto adjust_head; } if (timeout_cnt-- < 0) { printk(KERN_ERR DRV_NAME ": wait for adjust tx list head timeout\n"); break; } } if (tx_list_head->status.status_word != 0) { goto adjust_head; } } return; adjust_head: do { tx_list_head->desc_a.config &= ~DMAEN; tx_list_head->status.status_word = 0; if (tx_list_head->skb) { dev_kfree_skb(tx_list_head->skb); tx_list_head->skb = NULL; } else { printk(KERN_ERR DRV_NAME ": no sk_buff in a transmitted frame!\n"); } tx_list_head = tx_list_head->next; } while (tx_list_head->status.status_word != 0 && current_tx_ptr != tx_list_head); return; } static int bf537mac_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct bf537mac_local *lp = netdev_priv(dev); unsigned int data; current_tx_ptr->skb = skb; /* * Is skb->data always 16-bit aligned? * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)? */ if ((((unsigned int)(skb->data)) & 0x02) == 2) { /* move skb->data to current_tx_ptr payload */ data = (unsigned int)(skb->data) - 2; *((unsigned short *)data) = (unsigned short)(skb->len); current_tx_ptr->desc_a.start_addr = (unsigned long)data; /* this is important! */ blackfin_dcache_flush_range(data, (data + (skb->len)) + 2); } else { *((unsigned short *)(current_tx_ptr->packet)) = (unsigned short)(skb->len); memcpy((char *)(current_tx_ptr->packet + 2), skb->data, (skb->len)); current_tx_ptr->desc_a.start_addr = (unsigned long)current_tx_ptr->packet; if (current_tx_ptr->status.status_word != 0) current_tx_ptr->status.status_word = 0; blackfin_dcache_flush_range((unsigned int)current_tx_ptr-> packet, (unsigned int)(current_tx_ptr-> packet + skb->len) + 2); } /* enable this packet's dma */ current_tx_ptr->desc_a.config |= DMAEN; /* tx dma is running, just return */ if (bfin_read_DMA2_IRQ_STATUS() & 0x08) goto out; /* tx dma is not running */ bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a)); /* dma enabled, read from memory, size is 6 */ bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config); /* Turn on the EMAC tx */ bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE); out: adjust_tx_list(); current_tx_ptr = current_tx_ptr->next; dev->trans_start = jiffies; dev->stats.tx_packets++; dev->stats.tx_bytes += (skb->len); return 0; } static void bf537mac_rx(struct net_device *dev) { struct sk_buff *skb, *new_skb; struct bf537mac_local *lp = netdev_priv(dev); unsigned short len; /* allocate a new skb for next time receive */ skb = current_rx_ptr->skb; new_skb = dev_alloc_skb(PKT_BUF_SZ + 2); if (!new_skb) { printk(KERN_NOTICE DRV_NAME ": rx: low on mem - packet dropped\n"); dev->stats.rx_dropped++; goto out; } /* reserve 2 bytes for RXDWA padding */ skb_reserve(new_skb, 2); current_rx_ptr->skb = new_skb; current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2; /* Invidate the data cache of skb->data range when it is write back * cache. It will prevent overwritting the new data from DMA */ blackfin_dcache_invalidate_range((unsigned long)new_skb->head, (unsigned long)new_skb->end); len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN); skb_put(skb, len); blackfin_dcache_invalidate_range((unsigned long)skb->head, (unsigned long)skb->tail); dev->last_rx = jiffies; skb->dev = dev; skb->protocol = eth_type_trans(skb, dev); #if defined(BFIN_MAC_CSUM_OFFLOAD) skb->csum = current_rx_ptr->status.ip_payload_csum; skb->ip_summed = CHECKSUM_COMPLETE; #endif netif_rx(skb); dev->stats.rx_packets++; dev->stats.rx_bytes += len; current_rx_ptr->status.status_word = 0x00000000; current_rx_ptr = current_rx_ptr->next; out: return; } /* interrupt routine to handle rx and error signal */ static irqreturn_t bf537mac_interrupt(int irq, void *dev_id) { struct net_device *dev = dev_id; int number = 0; get_one_packet: if (current_rx_ptr->status.status_word == 0) { /* no more new packet received */ if (number == 0) { if (current_rx_ptr->next->status.status_word != 0) { current_rx_ptr = current_rx_ptr->next; goto real_rx; } } bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() | DMA_DONE | DMA_ERR); return IRQ_HANDLED; } real_rx: bf537mac_rx(dev); number++; goto get_one_packet; } #ifdef CONFIG_NET_POLL_CONTROLLER static void bf537mac_poll(struct net_device *dev) { disable_irq(IRQ_MAC_RX); bf537mac_interrupt(IRQ_MAC_RX, dev); enable_irq(IRQ_MAC_RX); } #endif /* CONFIG_NET_POLL_CONTROLLER */ static void bf537mac_disable(void) { unsigned int opmode; opmode = bfin_read_EMAC_OPMODE(); opmode &= (~RE); opmode &= (~TE); /* Turn off the EMAC */ bfin_write_EMAC_OPMODE(opmode); } /* * Enable Interrupts, Receive, and Transmit */ static void bf537mac_enable(void) { u32 opmode; pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__); /* Set RX DMA */ bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a)); bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config); /* Wait MII done */ mdio_poll(); /* We enable only RX here */ /* ASTP : Enable Automatic Pad Stripping PR : Promiscuous Mode for test PSF : Receive frames with total length less than 64 bytes. FDMODE : Full Duplex Mode LB : Internal Loopback for test RE : Receiver Enable */ opmode = bfin_read_EMAC_OPMODE(); if (opmode & FDMODE) opmode |= PSF; else opmode |= DRO | DC | PSF; opmode |= RE; #if defined(CONFIG_BFIN_MAC_RMII) opmode |= RMII; /* For Now only 100MBit are supported */ #if (defined(CONFIG_BF537) || defined(CONFIG_BF536)) && CONFIG_BF_REV_0_2 opmode |= TE; #endif #endif /* Turn on the EMAC rx */ bfin_write_EMAC_OPMODE(opmode); } /* Our watchdog timed out. Called by the networking layer */ static void bf537mac_timeout(struct net_device *dev) { pr_debug("%s: %s\n", dev->name, __FUNCTION__); bf537mac_disable(); /* reset tx queue */ tx_list_tail = tx_list_head->next; bf537mac_enable(); /* We can accept TX packets again */ dev->trans_start = jiffies; netif_wake_queue(dev); } static void bf537mac_multicast_hash(struct net_device *dev) { u32 emac_hashhi, emac_hashlo; struct dev_mc_list *dmi = dev->mc_list; char *addrs; int i; u32 crc; emac_hashhi = emac_hashlo = 0; for (i = 0; i < dev->mc_count; i++) { addrs = dmi->dmi_addr; dmi = dmi->next; /* skip non-multicast addresses */ if (!(*addrs & 1)) continue; crc = ether_crc(ETH_ALEN, addrs); crc >>= 26; if (crc & 0x20) emac_hashhi |= 1 << (crc & 0x1f); else emac_hashlo |= 1 << (crc & 0x1f); } bfin_write_EMAC_HASHHI(emac_hashhi); bfin_write_EMAC_HASHLO(emac_hashlo); return; } /* * This routine will, depending on the values passed to it, * either make it accept multicast packets, go into * promiscuous mode (for TCPDUMP and cousins) or accept * a select set of multicast packets */ static void bf537mac_set_multicast_list(struct net_device *dev) { u32 sysctl; if (dev->flags & IFF_PROMISC) { printk(KERN_INFO "%s: set to promisc mode\n", dev->name); sysctl = bfin_read_EMAC_OPMODE(); sysctl |= RAF; bfin_write_EMAC_OPMODE(sysctl); } else if (dev->flags & IFF_ALLMULTI) { /* accept all multicast */ sysctl = bfin_read_EMAC_OPMODE(); sysctl |= PAM; bfin_write_EMAC_OPMODE(sysctl); } else if (dev->mc_count) { /* set up multicast hash table */ sysctl = bfin_read_EMAC_OPMODE(); sysctl |= HM; bfin_write_EMAC_OPMODE(sysctl); bf537mac_multicast_hash(dev); } else { /* clear promisc or multicast mode */ sysctl = bfin_read_EMAC_OPMODE(); sysctl &= ~(RAF | PAM); bfin_write_EMAC_OPMODE(sysctl); } } /* * this puts the device in an inactive state */ static void bf537mac_shutdown(struct net_device *dev) { /* Turn off the EMAC */ bfin_write_EMAC_OPMODE(0x00000000); /* Turn off the EMAC RX DMA */ bfin_write_DMA1_CONFIG(0x0000); bfin_write_DMA2_CONFIG(0x0000); } /* * Open and Initialize the interface * * Set up everything, reset the card, etc.. */ static int bf537mac_open(struct net_device *dev) { struct bf537mac_local *lp = netdev_priv(dev); int retval; pr_debug("%s: %s\n", dev->name, __FUNCTION__); /* * Check that the address is valid. If its not, refuse * to bring the device up. The user must specify an * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx */ if (!is_valid_ether_addr(dev->dev_addr)) { printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n"); return -EINVAL; } /* initial rx and tx list */ retval = desc_list_init(); if (retval) return retval; phy_start(lp->phydev); phy_write(lp->phydev, MII_BMCR, BMCR_RESET); setup_system_regs(dev); bf537mac_disable(); bf537mac_enable(); pr_debug("hardware init finished\n"); netif_start_queue(dev); netif_carrier_on(dev); return 0; } /* * * this makes the board clean up everything that it can * and not talk to the outside world. Caused by * an 'ifconfig ethX down' */ static int bf537mac_close(struct net_device *dev) { struct bf537mac_local *lp = netdev_priv(dev); pr_debug("%s: %s\n", dev->name, __FUNCTION__); netif_stop_queue(dev); netif_carrier_off(dev); phy_stop(lp->phydev); phy_write(lp->phydev, MII_BMCR, BMCR_PDOWN); /* clear everything */ bf537mac_shutdown(dev); /* free the rx/tx buffers */ desc_list_free(); return 0; } static int __init bf537mac_probe(struct net_device *dev) { struct bf537mac_local *lp = netdev_priv(dev); int retval; int i; /* Grab the MAC address in the MAC */ *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO()); *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI()); /* probe mac */ /*todo: how to proble? which is revision_register */ bfin_write_EMAC_ADDRLO(0x12345678); if (bfin_read_EMAC_ADDRLO() != 0x12345678) { pr_debug("can't detect bf537 mac!\n"); retval = -ENODEV; goto err_out; } /* set the GPIO pins to Ethernet mode */ retval = setup_pin_mux(1); if (retval) return retval; /*Is it valid? (Did bootloader initialize it?) */ if (!is_valid_ether_addr(dev->dev_addr)) { /* Grab the MAC from the board somehow - this is done in the arch/blackfin/mach-bf537/boards/eth_mac.c */ bfin_get_ether_addr(dev->dev_addr); } /* If still not valid, get a random one */ if (!is_valid_ether_addr(dev->dev_addr)) { random_ether_addr(dev->dev_addr); } setup_mac_addr(dev->dev_addr); /* MDIO bus initial */ lp->mii_bus.priv = dev; lp->mii_bus.read = mdiobus_read; lp->mii_bus.write = mdiobus_write; lp->mii_bus.reset = mdiobus_reset; lp->mii_bus.name = "bfin_mac_mdio"; lp->mii_bus.id = 0; lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL); for (i = 0; i < PHY_MAX_ADDR; ++i) lp->mii_bus.irq[i] = PHY_POLL; mdiobus_register(&lp->mii_bus); retval = mii_probe(dev); if (retval) return retval; /* Fill in the fields of the device structure with ethernet values. */ ether_setup(dev); dev->open = bf537mac_open; dev->stop = bf537mac_close; dev->hard_start_xmit = bf537mac_hard_start_xmit; dev->set_mac_address = bf537mac_set_mac_address; dev->tx_timeout = bf537mac_timeout; dev->set_multicast_list = bf537mac_set_multicast_list; #ifdef CONFIG_NET_POLL_CONTROLLER dev->poll_controller = bf537mac_poll; #endif spin_lock_init(&lp->lock); /* now, enable interrupts */ /* register irq handler */ if (request_irq (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED, "EMAC_RX", dev)) { printk(KERN_WARNING DRV_NAME ": Unable to attach BlackFin MAC RX interrupt\n"); return -EBUSY; } retval = register_netdev(dev); if (retval == 0) { /* now, print out the card info, in a short format.. */ printk(KERN_INFO "%s: Version %s, %s\n", DRV_NAME, DRV_VERSION, DRV_DESC); } err_out: return retval; } static int bfin_mac_probe(struct platform_device *pdev) { struct net_device *ndev; ndev = alloc_etherdev(sizeof(struct bf537mac_local)); if (!ndev) { printk(KERN_WARNING DRV_NAME ": could not allocate device\n"); return -ENOMEM; } SET_NETDEV_DEV(ndev, &pdev->dev); platform_set_drvdata(pdev, ndev); if (bf537mac_probe(ndev) != 0) { platform_set_drvdata(pdev, NULL); free_netdev(ndev); printk(KERN_WARNING DRV_NAME ": not found\n"); return -ENODEV; } return 0; } static int bfin_mac_remove(struct platform_device *pdev) { struct net_device *ndev = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); unregister_netdev(ndev); free_irq(IRQ_MAC_RX, ndev); free_netdev(ndev); setup_pin_mux(0); return 0; } #ifdef CONFIG_PM static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg) { struct net_device *net_dev = platform_get_drvdata(pdev); if (netif_running(net_dev)) bf537mac_close(net_dev); return 0; } static int bfin_mac_resume(struct platform_device *pdev) { struct net_device *net_dev = platform_get_drvdata(pdev); if (netif_running(net_dev)) bf537mac_open(net_dev); return 0; } #else #define bfin_mac_suspend NULL #define bfin_mac_resume NULL #endif /* CONFIG_PM */ static struct platform_driver bfin_mac_driver = { .probe = bfin_mac_probe, .remove = bfin_mac_remove, .resume = bfin_mac_resume, .suspend = bfin_mac_suspend, .driver = { .name = DRV_NAME, }, }; static int __init bfin_mac_init(void) { return platform_driver_register(&bfin_mac_driver); } module_init(bfin_mac_init); static void __exit bfin_mac_cleanup(void) { platform_driver_unregister(&bfin_mac_driver); } module_exit(bfin_mac_cleanup);