diff options
Diffstat (limited to 'drivers/net/mipsnet.c')
| -rw-r--r-- | drivers/net/mipsnet.c | 345 |
1 files changed, 0 insertions, 345 deletions
diff --git a/drivers/net/mipsnet.c b/drivers/net/mipsnet.c deleted file mode 100644 index 004e64a..0000000 --- a/drivers/net/mipsnet.c +++ /dev/null @@ -1,345 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include <linux/platform_device.h> -#include <asm/mips-boards/simint.h> - -#define MIPSNET_VERSION "2007-11-17" - -/* - * Net status/control block as seen by sw in the core. - */ -struct mipsnet_regs { - /* - * Device info for probing, reads as MIPSNET%d where %d is some - * form of version. - */ - u64 devId; /*0x00 */ - - /* - * read only busy flag. - * Set and cleared by the Net Device to indicate that an rx or a tx - * is in progress. - */ - u32 busy; /*0x08 */ - - /* - * Set by the Net Device. - * The device will set it once data has been received. - * The value is the number of bytes that should be read from - * rxDataBuffer. The value will decrease till 0 until all the data - * from rxDataBuffer has been read. - */ - u32 rxDataCount; /*0x0c */ -#define MIPSNET_MAX_RXTX_DATACOUNT (1 << 16) - - /* - * Settable from the MIPS core, cleared by the Net Device. - * The core should set the number of bytes it wants to send, - * then it should write those bytes of data to txDataBuffer. - * The device will clear txDataCount has been processed (not - * necessarily sent). - */ - u32 txDataCount; /*0x10 */ - - /* - * Interrupt control - * - * Used to clear the interrupted generated by this dev. - * Write a 1 to clear the interrupt. (except bit31). - * - * Bit0 is set if it was a tx-done interrupt. - * Bit1 is set when new rx-data is available. - * Until this bit is cleared there will be no other RXs. - * - * Bit31 is used for testing, it clears after a read. - * Writing 1 to this bit will cause an interrupt to be generated. - * To clear the test interrupt, write 0 to this register. - */ - u32 interruptControl; /*0x14 */ -#define MIPSNET_INTCTL_TXDONE (1u << 0) -#define MIPSNET_INTCTL_RXDONE (1u << 1) -#define MIPSNET_INTCTL_TESTBIT (1u << 31) - - /* - * Readonly core-specific interrupt info for the device to signal - * the core. The meaning of the contents of this field might change. - */ - /* XXX: the whole memIntf interrupt scheme is messy: the device - * should have no control what so ever of what VPE/register set is - * being used. - * The MemIntf should only expose interrupt lines, and something in - * the config should be responsible for the line<->core/vpe bindings. - */ - u32 interruptInfo; /*0x18 */ - - /* - * This is where the received data is read out. - * There is more data to read until rxDataReady is 0. - * Only 1 byte at this regs offset is used. - */ - u32 rxDataBuffer; /*0x1c */ - - /* - * This is where the data to transmit is written. - * Data should be written for the amount specified in the - * txDataCount register. - * Only 1 byte at this regs offset is used. - */ - u32 txDataBuffer; /*0x20 */ -}; - -#define regaddr(dev, field) \ - (dev->base_addr + offsetof(struct mipsnet_regs, field)) - -static char mipsnet_string[] = "mipsnet"; - -/* - * Copy data from the MIPSNET rx data port - */ -static int ioiocpy_frommipsnet(struct net_device *dev, unsigned char *kdata, - int len) -{ - for (; len > 0; len--, kdata++) - *kdata = inb(regaddr(dev, rxDataBuffer)); - - return inl(regaddr(dev, rxDataCount)); -} - -static inline void mipsnet_put_todevice(struct net_device *dev, - struct sk_buff *skb) -{ - int count_to_go = skb->len; - char *buf_ptr = skb->data; - - outl(skb->len, regaddr(dev, txDataCount)); - - for (; count_to_go; buf_ptr++, count_to_go--) - outb(*buf_ptr, regaddr(dev, txDataBuffer)); - - dev->stats.tx_packets++; - dev->stats.tx_bytes += skb->len; - - dev_kfree_skb(skb); -} - -static int mipsnet_xmit(struct sk_buff *skb, struct net_device *dev) -{ - /* - * Only one packet at a time. Once TXDONE interrupt is serviced, the - * queue will be restarted. - */ - netif_stop_queue(dev); - mipsnet_put_todevice(dev, skb); - - return NETDEV_TX_OK; -} - -static inline ssize_t mipsnet_get_fromdev(struct net_device *dev, size_t len) -{ - struct sk_buff *skb; - - if (!len) - return len; - - skb = dev_alloc_skb(len + NET_IP_ALIGN); - if (!skb) { - dev->stats.rx_dropped++; - return -ENOMEM; - } - - skb_reserve(skb, NET_IP_ALIGN); - if (ioiocpy_frommipsnet(dev, skb_put(skb, len), len)) - return -EFAULT; - - skb->protocol = eth_type_trans(skb, dev); - skb->ip_summed = CHECKSUM_UNNECESSARY; - - netif_rx(skb); - - dev->stats.rx_packets++; - dev->stats.rx_bytes += len; - - return len; -} - -static irqreturn_t mipsnet_interrupt(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - u32 int_flags; - irqreturn_t ret = IRQ_NONE; - - if (irq != dev->irq) - goto out_badirq; - - /* TESTBIT is cleared on read. */ - int_flags = inl(regaddr(dev, interruptControl)); - if (int_flags & MIPSNET_INTCTL_TESTBIT) { - /* TESTBIT takes effect after a write with 0. */ - outl(0, regaddr(dev, interruptControl)); - ret = IRQ_HANDLED; - } else if (int_flags & MIPSNET_INTCTL_TXDONE) { - /* Only one packet at a time, we are done. */ - dev->stats.tx_packets++; - netif_wake_queue(dev); - outl(MIPSNET_INTCTL_TXDONE, - regaddr(dev, interruptControl)); - ret = IRQ_HANDLED; - } else if (int_flags & MIPSNET_INTCTL_RXDONE) { - mipsnet_get_fromdev(dev, inl(regaddr(dev, rxDataCount))); - outl(MIPSNET_INTCTL_RXDONE, regaddr(dev, interruptControl)); - ret = IRQ_HANDLED; - } - return ret; - -out_badirq: - printk(KERN_INFO "%s: %s(): irq %d for unknown device\n", - dev->name, __func__, irq); - return ret; -} - -static int mipsnet_open(struct net_device *dev) -{ - int err; - - err = request_irq(dev->irq, mipsnet_interrupt, - IRQF_SHARED, dev->name, (void *) dev); - if (err) { - release_region(dev->base_addr, sizeof(struct mipsnet_regs)); - return err; - } - - netif_start_queue(dev); - - /* test interrupt handler */ - outl(MIPSNET_INTCTL_TESTBIT, regaddr(dev, interruptControl)); - - return 0; -} - -static int mipsnet_close(struct net_device *dev) -{ - netif_stop_queue(dev); - free_irq(dev->irq, dev); - return 0; -} - -static void mipsnet_set_mclist(struct net_device *dev) -{ -} - -static const struct net_device_ops mipsnet_netdev_ops = { - .ndo_open = mipsnet_open, - .ndo_stop = mipsnet_close, - .ndo_start_xmit = mipsnet_xmit, - .ndo_set_multicast_list = mipsnet_set_mclist, - .ndo_change_mtu = eth_change_mtu, - .ndo_validate_addr = eth_validate_addr, - .ndo_set_mac_address = eth_mac_addr, -}; - -static int __devinit mipsnet_probe(struct platform_device *dev) -{ - struct net_device *netdev; - int err; - - netdev = alloc_etherdev(0); - if (!netdev) { - err = -ENOMEM; - goto out; - } - - platform_set_drvdata(dev, netdev); - - netdev->netdev_ops = &mipsnet_netdev_ops; - - /* - * TODO: probe for these or load them from PARAM - */ - netdev->base_addr = 0x4200; - netdev->irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_MB0 + - inl(regaddr(netdev, interruptInfo)); - - /* Get the io region now, get irq on open() */ - if (!request_region(netdev->base_addr, sizeof(struct mipsnet_regs), - "mipsnet")) { - err = -EBUSY; - goto out_free_netdev; - } - - /* - * Lacking any better mechanism to allocate a MAC address we use a - * random one ... - */ - random_ether_addr(netdev->dev_addr); - - err = register_netdev(netdev); - if (err) { - printk(KERN_ERR "MIPSNet: failed to register netdev.\n"); - goto out_free_region; - } - - return 0; - -out_free_region: - release_region(netdev->base_addr, sizeof(struct mipsnet_regs)); - -out_free_netdev: - free_netdev(netdev); - -out: - return err; -} - -static int __devexit mipsnet_device_remove(struct platform_device *device) -{ - struct net_device *dev = platform_get_drvdata(device); - - unregister_netdev(dev); - release_region(dev->base_addr, sizeof(struct mipsnet_regs)); - free_netdev(dev); - platform_set_drvdata(device, NULL); - - return 0; -} - -static struct platform_driver mipsnet_driver = { - .driver = { - .name = mipsnet_string, - .owner = THIS_MODULE, - }, - .probe = mipsnet_probe, - .remove = __devexit_p(mipsnet_device_remove), -}; - -static int __init mipsnet_init_module(void) -{ - int err; - - printk(KERN_INFO "MIPSNet Ethernet driver. Version: %s. " - "(c)2005 MIPS Technologies, Inc.\n", MIPSNET_VERSION); - - err = platform_driver_register(&mipsnet_driver); - if (err) - printk(KERN_ERR "Driver registration failed\n"); - - return err; -} - -static void __exit mipsnet_exit_module(void) -{ - platform_driver_unregister(&mipsnet_driver); -} - -module_init(mipsnet_init_module); -module_exit(mipsnet_exit_module); |
