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         u8 macaddr[ETH_ALEN];
  78         u_long *addr;
  79         u_long address;
  80         int err;
  81
  82         if (!MACH_IS_MVME147 || called)
  83                 return ERR_PTR(-ENODEV);
  84         called++;
  85
  86         dev = alloc_etherdev(sizeof(struct m147lance_private));
  87         if (!dev)
  88                 return ERR_PTR(-ENOMEM);
  89
  90         /* Fill the dev fields */
  91         dev->base_addr = (unsigned long)MVME147_LANCE_BASE;
  92         dev->netdev_ops = &lance_netdev_ops;
  93         dev->dma = 0;
  94
  95         addr = (u_long *)ETHERNET_ADDRESS;
  96         address = *addr;
  97         macaddr[0] = 0x08;
  98         macaddr[1] = 0x00;
  99         macaddr[2] = 0x3e;
 100         address = address >> 8;
 101         macaddr[5] = address&0xff;
 102         address = address >> 8;
 103         macaddr[4] = address&0xff;
 104         address = address >> 8;
 105         macaddr[3] = address&0xff;
 106         eth_hw_addr_set(dev, macaddr);
 107
 108         lp = netdev_priv(dev);
 109         lp->ram = __get_dma_pages(GFP_ATOMIC, 3);       /* 32K */
 110         if (!lp->ram) {
 111                 printk("%s: No memory for LANCE buffers\n", dev->name);
 112                 free_netdev(dev);
 113                 return ERR_PTR(-ENOMEM);
 114         }
 115
 116         lp->lance.name = name;
 117         lp->lance.base = dev->base_addr;
 118         lp->lance.init_block = (struct lance_init_block *)(lp->ram); /* CPU addr */
 119         lp->lance.lance_init_block = (struct lance_init_block *)(lp->ram);                 /* LANCE addr of same RAM */
 120         lp->lance.busmaster_regval = LE_C3_BSWP;        /* we're bigendian */
 121         lp->lance.irq = MVME147_LANCE_IRQ;
 122         lp->lance.writerap = (writerap_t)m147lance_writerap;
 123         lp->lance.writerdp = (writerdp_t)m147lance_writerdp;
 124         lp->lance.readrdp = (readrdp_t)m147lance_readrdp;
 125         lp->lance.lance_log_rx_bufs = LANCE_LOG_RX_BUFFERS;
 126         lp->lance.lance_log_tx_bufs = LANCE_LOG_TX_BUFFERS;
 127         lp->lance.rx_ring_mod_mask = RX_RING_MOD_MASK;
 128         lp->lance.tx_ring_mod_mask = TX_RING_MOD_MASK;
 129
 130         err = register_netdev(dev);
 131         if (err) {
 132                 free_pages(lp->ram, 3);
 133                 free_netdev(dev);
 134                 return ERR_PTR(err);
 135         }
 136
 137         netdev_info(dev, "MVME147 at 0x%08lx, irq %d, Hardware Address %pM\n",
 138                     dev->base_addr, MVME147_LANCE_IRQ, dev->dev_addr);
 139
 140         return dev;
 141 }
 142
 143 static void m147lance_writerap(struct lance_private *lp, unsigned short value)
 144 {
 145         out_be16(lp->base + LANCE_RAP, value);
 146 }
 147
 148 static void m147lance_writerdp(struct lance_private *lp, unsigned short value)
 149 {
 150         out_be16(lp->base + LANCE_RDP, value);
 151 }
 152
 153 static unsigned short m147lance_readrdp(struct lance_private *lp)
 154 {
 155         return in_be16(lp->base + LANCE_RDP);
 156 }
 157
 158 static int m147lance_open(struct net_device *dev)
 159 {
 160         int status;
 161
 162         status = lance_open(dev);                 /* call generic lance open code */
 163         if (status)
 164                 return status;
 165         /* enable interrupts at board level. */
 166         m147_pcc->lan_cntrl = 0;       /* clear the interrupts (if any) */
 167         m147_pcc->lan_cntrl = 0x08 | 0x04;     /* Enable irq 4 */
 168
 169         return 0;
 170 }
 171
 172 static int m147lance_close(struct net_device *dev)
 173 {
 174         /* disable interrupts at boardlevel */
 175         m147_pcc->lan_cntrl = 0x0; /* disable interrupts */
 176         lance_close(dev);
 177         return 0;
 178 }
 179
 180 MODULE_DESCRIPTION("MVME147 LANCE Ethernet driver");
 181 MODULE_LICENSE("GPL");
 182
 183 static struct net_device *dev_mvme147_lance;
 184 static int __init m147lance_init(void)
 185 {
 186         dev_mvme147_lance = mvme147lance_probe();
 187         return PTR_ERR_OR_ZERO(dev_mvme147_lance);
 188 }
 189 module_init(m147lance_init);
 190
 191 static void __exit m147lance_exit(void)
 192 {
 193         struct m147lance_private *lp = netdev_priv(dev_mvme147_lance);
 194         unregister_netdev(dev_mvme147_lance);
 195         free_pages(lp->ram, 3);
 196         free_netdev(dev_mvme147_lance);
 197 }
 198 module_exit(m147lance_exit);