+++ /dev/null
-/*
- * 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 = netdev_alloc_skb(dev, 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_rx_mode = 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 ...
- */
- eth_hw_addr_random(netdev);
-
- 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);
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff