hplance.c
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上传日期:2013-02-24
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- /* hplance.c : the Linux/hp300/lance ethernet driver
- *
- * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
- * Based on the Sun Lance driver and the NetBSD HP Lance driver
- * Uses the generic 7990.c LANCE code.
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/interrupt.h>
- #include <linux/ptrace.h>
- #include <linux/ioport.h>
- #include <linux/slab.h>
- #include <linux/string.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/errno.h>
- #include <asm/system.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- /* Used for the temporal inet entries and routing */
- #include <linux/socket.h>
- #include <linux/route.h>
- #include <linux/dio.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include "hplance.h"
- /* We have 16834 bytes of RAM for the init block and buffers. This places
- * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
- * buffers and 2 Tx buffers.
- */
- #define LANCE_LOG_TX_BUFFERS 1
- #define LANCE_LOG_RX_BUFFERS 3
- #include "7990.h" /* use generic LANCE code */
- /* Our private data structure */
- struct hplance_private {
- struct lance_private lance;
- unsigned int scode;
- void *base;
- };
- /* function prototypes... This is easy because all the grot is in the
- * generic LANCE support. All we have to support is probing for boards,
- * plus board-specific init, open and close actions.
- * Oh, and we need to tell the generic code how to read and write LANCE registers...
- */
- int hplance_probe(struct net_device *dev);
- static int hplance_init(struct net_device *dev, int scode);
- static int hplance_open(struct net_device *dev);
- static int hplance_close(struct net_device *dev);
- static void hplance_writerap(struct hplance_private *lp, unsigned short value);
- static void hplance_writerdp(struct hplance_private *lp, unsigned short value);
- static unsigned short hplance_readrdp(struct hplance_private *lp);
- #ifdef MODULE
- static struct hplance_private *root_hplance_dev;
- #endif
- /* Find all the HP Lance boards and initialise them... */
- int __init hplance_probe(struct net_device *dev)
- {
- int cards = 0, called = 0;
- if (!MACH_IS_HP300 || called)
- return(ENODEV);
- called++;
-
- /* Isn't DIO nice? */
- for(;;)
- {
- int v, scode = dio_find(DIO_ID_LAN);
-
- if (!scode)
- break;
-
- if(cards)
- dev = NULL; /* don't trash previous device, make a new one */
- cards++;
-
- v = hplance_init(dev, scode);
- if (v) /* error, abort immediately */
- return v;
- }
- /* OK, return success, or ENODEV if we didn't find any cards */
- if (!cards)
- return -ENODEV;
- return 0;
- }
- /* Initialise a single lance board at the given select code */
- static int __init hplance_init(struct net_device *dev, int scode)
- {
- /* const char *name = dio_scodetoname(scode); */
- static const char name[] = "HP LANCE";
- void *va = dio_scodetoviraddr(scode);
- struct hplance_private *lp;
- int i;
-
- #ifdef MODULE
- dev = init_etherdev(0, sizeof(struct hplance_private));
- if (!dev)
- return -ENOMEM;
- #else
- dev->priv = kmalloc(sizeof(struct hplance_private), GFP_KERNEL);
- if (dev->priv == NULL)
- return -ENOMEM;
- memset(dev->priv, 0, sizeof(struct hplance_private));
- #endif
- SET_MODULE_OWNER(dev);
- printk("%s: HP LANCE; select code %d, addr", dev->name, scode);
- /* reset the board */
- writeb(0xff,va+DIO_IDOFF);
- udelay(100); /* ariba! ariba! udelay! udelay! */
- /* Fill the dev fields */
- dev->base_addr = (unsigned long)va;
- dev->open = &hplance_open;
- dev->stop = &hplance_close;
- dev->hard_start_xmit = &lance_start_xmit;
- dev->get_stats = &lance_get_stats;
- dev->set_multicast_list = &lance_set_multicast;
- dev->dma = 0;
-
- for (i=0; i<6; i++)
- {
- /* The NVRAM holds our ethernet address, one nibble per byte,
- * at bytes NVRAMOFF+1,3,5,7,9...
- */
- dev->dev_addr[i] = ((readb(va + HPLANCE_NVRAMOFF + i*4 + 1) & 0xF) << 4)
- | (readb(va + HPLANCE_NVRAMOFF + i*4 + 3) & 0xF);
- printk("%c%2.2x", i == 0 ? ' ' : ':', dev->dev_addr[i]);
- }
-
- lp = (struct hplance_private *)dev->priv;
- lp->lance.name = (char*)name; /* discards const, shut up gcc */
- lp->lance.ll = (struct lance_regs *)(va + HPLANCE_REGOFF);
- lp->lance.init_block = (struct lance_init_block *)(va + HPLANCE_MEMOFF); /* CPU addr */
- lp->lance.lance_init_block = 0; /* LANCE addr of same RAM */
- lp->lance.busmaster_regval = LE_C3_BSWP; /* we're bigendian */
- lp->lance.irq = dio_scodetoipl(scode);
- lp->lance.writerap = hplance_writerap;
- lp->lance.writerdp = hplance_writerdp;
- lp->lance.readrdp = hplance_readrdp;
- lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
- lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
- lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
- lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
- lp->scode = scode;
- lp->base = va;
- ether_setup(dev);
- printk(", irq %dn", lp->lance.irq);
- #ifdef MODULE
- dev->ifindex = dev_new_index();
- lp->next_module = root_hplance_dev;
- root_hplance_dev = lp;
- #endif /* MODULE */
- dio_config_board(scode); /* tell bus scanning code this one's taken */
- return 0;
- }
- /* This is disgusting. We have to check the DIO status register for ack every
- * time we read or write the LANCE registers.
- */
- static void hplance_writerap(struct hplance_private *lp, unsigned short value)
- {
- struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
- do {
- lp->lance.ll->rap = value;
- } while ((hpregs->status & LE_ACK) == 0);
- }
- static void hplance_writerdp(struct hplance_private *lp, unsigned short value)
- {
- struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
- do {
- lp->lance.ll->rdp = value;
- } while ((hpregs->status & LE_ACK) == 0);
- }
- static unsigned short hplance_readrdp(struct hplance_private *lp)
- {
- unsigned short val;
- struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
- do {
- val = lp->lance.ll->rdp;
- } while ((hpregs->status & LE_ACK) == 0);
- return val;
- }
- static int hplance_open(struct net_device *dev)
- {
- int status;
- struct hplance_private *lp = (struct hplance_private *)dev->priv;
- struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
-
- status = lance_open(dev); /* call generic lance open code */
- if (status)
- return status;
- /* enable interrupts at board level. */
- writeb(LE_IE, &(hpregs->status));
- return 0;
- }
- static int hplance_close(struct net_device *dev)
- {
- struct hplance_private *lp = (struct hplance_private *)dev->priv;
- struct hplance_reg *hpregs = (struct hplance_reg *)lp->base;
- writeb(0,&(hpregs->status)); /* disable interrupts at boardlevel */
- lance_close(dev);
- return 0;
- }
- #ifdef MODULE
- MODULE_LICENSE("GPL");
- int init_module(void)
- {
- root_lance_dev = NULL;
- return hplance_probe(NULL);
- }
- void cleanup_module(void)
- {
- /* Walk the chain of devices, unregistering them */
- struct hplance_private *lp;
- while (root_hplance_dev) {
- lp = root_hplance_dev->next_module;
- dio_unconfig_board(lp->scode);
- unregister_netdev(root_lance_dev->dev);
- kfree(root_lance_dev->dev);
- root_lance_dev = lp;
- }
- }
- #endif /* MODULE */