295 lines
7.0 KiB
C
295 lines
7.0 KiB
C
/* stnic.c : A SH7750 specific part of driver for NS DP83902A ST-NIC.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1999 kaz Kojima
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <mach-se/mach/se.h>
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#include <asm/machvec.h>
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#ifdef CONFIG_SH_STANDARD_BIOS
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#include <asm/sh_bios.h>
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#endif
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#include "8390.h"
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#define DRV_NAME "stnic"
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#define byte unsigned char
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#define half unsigned short
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#define word unsigned int
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#define vbyte volatile unsigned char
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#define vhalf volatile unsigned short
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#define vword volatile unsigned int
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#define STNIC_RUN 0x01 /* 1 == Run, 0 == reset. */
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#define START_PG 0 /* First page of TX buffer */
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#define STOP_PG 128 /* Last page +1 of RX ring */
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/* Alias */
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#define STNIC_CR E8390_CMD
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#define PG0_RSAR0 EN0_RSARLO
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#define PG0_RSAR1 EN0_RSARHI
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#define PG0_RBCR0 EN0_RCNTLO
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#define PG0_RBCR1 EN0_RCNTHI
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#define CR_RRD E8390_RREAD
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#define CR_RWR E8390_RWRITE
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#define CR_PG0 E8390_PAGE0
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#define CR_STA E8390_START
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#define CR_RDMA E8390_NODMA
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/* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS. */
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static byte stnic_eadr[6] =
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{0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07};
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static struct net_device *stnic_dev;
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static void stnic_reset (struct net_device *dev);
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static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
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int ring_page);
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static void stnic_block_input (struct net_device *dev, int count,
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struct sk_buff *skb , int ring_offset);
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static void stnic_block_output (struct net_device *dev, int count,
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const unsigned char *buf, int start_page);
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static void stnic_init (struct net_device *dev);
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/* SH7750 specific read/write io. */
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static inline void
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STNIC_DELAY (void)
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{
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vword trash;
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trash = *(vword *) 0xa0000000;
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trash = *(vword *) 0xa0000000;
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trash = *(vword *) 0xa0000000;
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}
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static inline byte
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STNIC_READ (int reg)
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{
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byte val;
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val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
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STNIC_DELAY ();
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return val;
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}
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static inline void
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STNIC_WRITE (int reg, byte val)
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{
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*(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
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STNIC_DELAY ();
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}
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static int __init stnic_probe(void)
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{
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struct net_device *dev;
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int i, err;
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/* If we are not running on a SolutionEngine, give up now */
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if (! MACH_SE)
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return -ENODEV;
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/* New style probing API */
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dev = alloc_ei_netdev();
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if (!dev)
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return -ENOMEM;
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#ifdef CONFIG_SH_STANDARD_BIOS
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sh_bios_get_node_addr (stnic_eadr);
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#endif
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for (i = 0; i < ETHER_ADDR_LEN; i++)
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dev->dev_addr[i] = stnic_eadr[i];
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/* Set the base address to point to the NIC, not the "real" base! */
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dev->base_addr = 0x1000;
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dev->irq = IRQ_STNIC;
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dev->netdev_ops = &ei_netdev_ops;
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/* Snarf the interrupt now. There's no point in waiting since we cannot
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share and the board will usually be enabled. */
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err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
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if (err) {
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printk (KERN_EMERG " unable to get IRQ %d.\n", dev->irq);
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free_netdev(dev);
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return err;
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}
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ei_status.name = dev->name;
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ei_status.word16 = 1;
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#ifdef __LITTLE_ENDIAN__
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ei_status.bigendian = 0;
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#else
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ei_status.bigendian = 1;
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#endif
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ei_status.tx_start_page = START_PG;
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ei_status.rx_start_page = START_PG + TX_PAGES;
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ei_status.stop_page = STOP_PG;
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ei_status.reset_8390 = &stnic_reset;
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ei_status.get_8390_hdr = &stnic_get_hdr;
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ei_status.block_input = &stnic_block_input;
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ei_status.block_output = &stnic_block_output;
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stnic_init (dev);
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err = register_netdev(dev);
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if (err) {
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free_irq(dev->irq, dev);
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free_netdev(dev);
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return err;
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}
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stnic_dev = dev;
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printk (KERN_INFO "NS ST-NIC 83902A\n");
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return 0;
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}
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static void
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stnic_reset (struct net_device *dev)
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{
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*(vhalf *) PA_83902_RST = 0;
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udelay (5);
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if (ei_debug > 1)
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printk (KERN_WARNING "8390 reset done (%ld).\n", jiffies);
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*(vhalf *) PA_83902_RST = ~0;
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udelay (5);
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}
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static void
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stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
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int ring_page)
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{
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half buf[2];
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STNIC_WRITE (PG0_RSAR0, 0);
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STNIC_WRITE (PG0_RSAR1, ring_page);
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STNIC_WRITE (PG0_RBCR0, 4);
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STNIC_WRITE (PG0_RBCR1, 0);
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STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
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buf[0] = *(vhalf *) PA_83902_IF;
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STNIC_DELAY ();
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buf[1] = *(vhalf *) PA_83902_IF;
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STNIC_DELAY ();
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hdr->next = buf[0] >> 8;
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hdr->status = buf[0] & 0xff;
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#ifdef __LITTLE_ENDIAN__
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hdr->count = buf[1];
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#else
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hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
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#endif
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if (ei_debug > 1)
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printk (KERN_DEBUG "ring %x status %02x next %02x count %04x.\n",
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ring_page, hdr->status, hdr->next, hdr->count);
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STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
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}
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/* Block input and output, similar to the Crynwr packet driver. If you are
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porting to a new ethercard look at the packet driver source for hints.
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The HP LAN doesn't use shared memory -- we put the packet
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out through the "remote DMA" dataport. */
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static void
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stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
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int offset)
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{
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char *buf = skb->data;
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half val;
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STNIC_WRITE (PG0_RSAR0, offset & 0xff);
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STNIC_WRITE (PG0_RSAR1, offset >> 8);
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STNIC_WRITE (PG0_RBCR0, length & 0xff);
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STNIC_WRITE (PG0_RBCR1, length >> 8);
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STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
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if (length & 1)
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length++;
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while (length > 0)
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{
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val = *(vhalf *) PA_83902_IF;
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#ifdef __LITTLE_ENDIAN__
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*buf++ = val & 0xff;
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*buf++ = val >> 8;
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#else
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*buf++ = val >> 8;
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*buf++ = val & 0xff;
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#endif
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STNIC_DELAY ();
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length -= sizeof (half);
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}
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STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
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}
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static void
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stnic_block_output (struct net_device *dev, int length,
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const unsigned char *buf, int output_page)
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{
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STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */
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STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
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STNIC_DELAY ();
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STNIC_WRITE (PG0_RBCR0, length & 0xff);
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STNIC_WRITE (PG0_RBCR1, length >> 8);
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STNIC_WRITE (PG0_RSAR0, 0);
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STNIC_WRITE (PG0_RSAR1, output_page);
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STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
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if (length & 1)
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length++;
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while (length > 0)
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{
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#ifdef __LITTLE_ENDIAN__
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*(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
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#else
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*(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
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#endif
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STNIC_DELAY ();
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buf += sizeof (half);
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length -= sizeof (half);
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}
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STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
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}
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/* This function resets the STNIC if something screws up. */
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static void
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stnic_init (struct net_device *dev)
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{
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stnic_reset (dev);
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NS8390_init (dev, 0);
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}
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static void __exit stnic_cleanup(void)
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{
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unregister_netdev(stnic_dev);
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free_irq(stnic_dev->irq, stnic_dev);
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free_netdev(stnic_dev);
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}
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module_init(stnic_probe);
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module_exit(stnic_cleanup);
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MODULE_LICENSE("GPL");
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