drivers/net/ethernet/amd/mvme147.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* mvme147.c  : the  Linux/mvme147/lance ethernet driver
   3  *
   4  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
   5  * Based on the Sun Lance driver and the NetBSD HP Lance driver
   6  * Uses the generic 7990.c LANCE code.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/ioport.h>
  14 #include <linux/string.h>
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/errno.h>
  18 #include <linux/gfp.h>
  19 #include <linux/pgtable.h>
  20 /* Used for the temporal inet entries and routing */
  21 #include <linux/socket.h>
  22 #include <linux/route.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/skbuff.h>
  26
  27 #include <asm/io.h>
  28 #include <asm/mvme147hw.h>
  29
  30 /* We have 32K of RAM for the init block and buffers. This places
  31  * an upper limit on the number of buffers we can use. NetBSD uses 8 Rx
  32  * buffers and 2 Tx buffers, it takes (8 + 2) * 1544 bytes.
  33  */
  34 #define LANCE_LOG_TX_BUFFERS 1
  35 #define LANCE_LOG_RX_BUFFERS 3
  36
  37 #include "7990.h"                                 /* use generic LANCE code */
  38
  39 /* Our private data structure */
  40 struct m147lance_private {
  41         struct lance_private lance;
  42         unsigned long ram;
  43 };
  44
  45 /* function prototypes... This is easy because all the grot is in the
  46  * generic LANCE support. All we have to support is probing for boards,
  47  * plus board-specific init, open and close actions.
  48  * Oh, and we need to tell the generic code how to read and write LANCE registers...
  49  */
  50 static int m147lance_open(struct net_device *dev);
  51 static int m147lance_close(struct net_device *dev);
  52 static void m147lance_writerap(struct lance_private *lp, unsigned short value);
  53 static void m147lance_writerdp(struct lance_private *lp, unsigned short value);
  54 static unsigned short m147lance_readrdp(struct lance_private *lp);
  55
  56 typedef void (*writerap_t)(void *, unsigned short);
  57 typedef void (*writerdp_t)(void *, unsigned short);
  58 typedef unsigned short (*readrdp_t)(void *);
  59
  60 static const struct net_device_ops lance_netdev_ops = {
  61         .ndo_open               = m147lance_open,
  62         .ndo_stop               = m147lance_close,
  63         .ndo_start_xmit         = lance_start_xmit,
  64         .ndo_set_rx_mode        = lance_set_multicast,
  65         .ndo_tx_timeout         = lance_tx_timeout,
  66         .ndo_validate_addr      = eth_validate_addr,
  67         .ndo_set_mac_address    = eth_mac_addr,
  68 };
  69
  70 /* Initialise the one and only on-board 7990 */
  71 static struct net_device * __init mvme147lance_probe(void)
  72 {
  73         struct net_device *dev;
  74         static int called;
  75         static const char name[] = "MVME147 LANCE";
  76         struct m147lance_private *lp;
  77         u_long *addr;
  78         u_long address;
  79         int err;
  80
  81         if (!MACH_IS_MVME147 || called)
  82                 return ERR_PTR(-ENODEV);
  83         called++;
  84
  85         dev = alloc_etherdev(sizeof(struct m147lance_private));
  86         if (!dev)
  87                 return ERR_PTR(-ENOMEM);
  88
  89         /* Fill the dev fields */
  90         dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
  91         dev->netdev_ops = &lance_netdev_ops;
  92         dev->dma = 0;
  93
  94         addr = (u_long *)ETHERNET_ADDRESS;
  95         address = *addr;
  96         dev->dev_addr[0] = 0x08;
  97         dev->dev_addr[1] = 0x00;
  98         dev->dev_addr[2] = 0x3e;
  99         address = address >> 8;
 100         dev->dev_addr[5] = address&0xff;
 101         address = address >> 8;
 102         dev->dev_addr[4] = address&0xff;
 103         address = address >> 8;
 104         dev->dev_addr[3] = address&0xff;
 105
 106         printk("%s: MVME147 at 0x%08lx, irq %d, Hardware Address %pM\n",
 107                dev->name, dev->base_addr, MVME147_LANCE_IRQ,
 108                dev->dev_addr);
 109
 110         lp = netdev_priv(dev);
 111         lp->ram = __get_dma_pages(GFP_ATOMIC, 3);       /* 32K */
 112         if (!lp->ram) {
 113                 printk("%s: No memory for LANCE buffers\n", dev->name);
 114                 free_netdev(dev);
 115                 return ERR_PTR(-ENOMEM);
 116         }
 117
 118         lp->lance.name = name;
 119         lp->lance.base = dev->base_addr;
 120         lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
 121         lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
 122         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 123         lp->lance.irq = MVME147_LANCE_IRQ;
 124         lp->lance.writerap = (writerap_t)m147lance_writerap;
 125         lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
 126         lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
 127         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 128         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 129         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 130         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 131
 132         err = register_netdev(dev);
 133         if (err) {
 134                 free_pages(lp->ram, 3);
 135                 free_netdev(dev);
 136                 return ERR_PTR(err);
 137         }
 138
 139         return dev;
 140 }
 141
 142 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
 143 {
 144         out_be16(lp->base + LANCE_RAP, value);
 145 }
 146
 147 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
 148 {
 149         out_be16(lp->base + LANCE_RDP, value);
 150 }
 151
 152 static unsigned short m147lance_readrdp(struct lance_private *lp)
 153 {
 154         return in_be16(lp->base + LANCE_RDP);
 155 }
 156
 157 static int m147lance_open(struct net_device *dev)
 158 {
 159         int status;
 160
 161         status = lance_open(dev);                 /* call generic lance open code */
 162         if (status)
 163                 return status;
 164         /* enable interrupts at board level. */
 165         m147_pcc->lan_cntrl = 0;       /* clear the interrupts (if any) */
 166         m147_pcc->lan_cntrl = 0x08 | 0x04;     /* Enable irq 4 */
 167
 168         return 0;
 169 }
 170
 171 static int m147lance_close(struct net_device *dev)
 172 {
 173         /* disable interrupts at boardlevel */
 174         m147_pcc->lan_cntrl = 0x0; /* disable interrupts */
 175         lance_close(dev);
 176         return 0;
 177 }
 178
 179 MODULE_LICENSE("GPL");
 180
 181 static struct net_device *dev_mvme147_lance;
 182 static int __init m147lance_init(void)
 183 {
 184         dev_mvme147_lance = mvme147lance_probe();
 185         return PTR_ERR_OR_ZERO(dev_mvme147_lance);
 186 }
 187 module_init(m147lance_init);
 188
 189 static void __exit m147lance_exit(void)
 190 {
 191         struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
 192         unregister_netdev(dev_mvme147_lance);
 193         free_pages(lp->ram, 3);
 194         free_netdev(dev_mvme147_lance);
 195 }
 196 module_exit(m147lance_exit);