drivers/net/stnic.c

   1 /* stnic.c : A SH7750 specific part of driver for NS DP83902A ST-NIC.
   2  *
   3  * This file is subject to the terms and conditions of the GNU General Public
   4  * License.  See the file "COPYING" in the main directory of this archive
   5  * for more details.
   6  *
   7  * Copyright (C) 1999 kaz Kojima
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/ioport.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19
  20 #include <asm/system.h>
  21 #include <asm/io.h>
  22 #include <mach-se/mach/se.h>
  23 #include <asm/machvec.h>
  24 #ifdef CONFIG_SH_STANDARD_BIOS
  25 #include <asm/sh_bios.h>
  26 #endif
  27
  28 #include "8390.h"
  29
  30 #define DRV_NAME "stnic"
  31
  32 #define byte    unsigned char
  33 #define half    unsigned short
  34 #define word    unsigned int
  35 #define vbyte   volatile unsigned char
  36 #define vhalf   volatile unsigned short
  37 #define vword   volatile unsigned int
  38
  39 #define STNIC_RUN       0x01    /* 1 == Run, 0 == reset. */
  40
  41 #define START_PG        0       /* First page of TX buffer */
  42 #define STOP_PG         128     /* Last page +1 of RX ring */
  43
  44 /* Alias */
  45 #define STNIC_CR        E8390_CMD
  46 #define PG0_RSAR0       EN0_RSARLO
  47 #define PG0_RSAR1       EN0_RSARHI
  48 #define PG0_RBCR0       EN0_RCNTLO
  49 #define PG0_RBCR1       EN0_RCNTHI
  50
  51 #define CR_RRD          E8390_RREAD
  52 #define CR_RWR          E8390_RWRITE
  53 #define CR_PG0          E8390_PAGE0
  54 #define CR_STA          E8390_START
  55 #define CR_RDMA         E8390_NODMA
  56
  57 /* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS.  */
  58 static byte stnic_eadr[6] =
  59 {0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07};
  60
  61 static struct net_device *stnic_dev;
  62
  63 static void stnic_reset (struct net_device *dev);
  64 static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
  65                            int ring_page);
  66 static void stnic_block_input (struct net_device *dev, int count,
  67                                struct sk_buff *skb , int ring_offset);
  68 static void stnic_block_output (struct net_device *dev, int count,
  69                                 const unsigned char *buf, int start_page);
  70
  71 static void stnic_init (struct net_device *dev);
  72
  73 /* SH7750 specific read/write io. */
  74 static inline void
  75 STNIC_DELAY (void)
  76 {
  77   vword trash;
  78   trash = *(vword *) 0xa0000000;
  79   trash = *(vword *) 0xa0000000;
  80   trash = *(vword *) 0xa0000000;
  81 }
  82
  83 static inline byte
  84 STNIC_READ (int reg)
  85 {
  86   byte val;
  87
  88   val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
  89   STNIC_DELAY ();
  90   return val;
  91 }
  92
  93 static inline void
  94 STNIC_WRITE (int reg, byte val)
  95 {
  96   *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
  97   STNIC_DELAY ();
  98 }
  99
 100 static int __init stnic_probe(void)
 101 {
 102   struct net_device *dev;
 103   int i, err;
 104
 105   /* If we are not running on a SolutionEngine, give up now */
 106   if (! MACH_SE)
 107     return -ENODEV;
 108
 109   /* New style probing API */
 110   dev = alloc_ei_netdev();
 111   if (!dev)
 112         return -ENOMEM;
 113
 114 #ifdef CONFIG_SH_STANDARD_BIOS
 115   sh_bios_get_node_addr (stnic_eadr);
 116 #endif
 117   for (i = 0; i < ETHER_ADDR_LEN; i++)
 118     dev->dev_addr[i] = stnic_eadr[i];
 119
 120   /* Set the base address to point to the NIC, not the "real" base! */
 121   dev->base_addr = 0x1000;
 122   dev->irq = IRQ_STNIC;
 123   dev->netdev_ops = &ei_netdev_ops;
 124
 125   /* Snarf the interrupt now.  There's no point in waiting since we cannot
 126      share and the board will usually be enabled. */
 127   err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
 128   if (err)  {
 129       printk (KERN_EMERG " unable to get IRQ %d.\n", dev->irq);
 130       free_netdev(dev);
 131       return err;
 132     }
 133
 134   ei_status.name = dev->name;
 135   ei_status.word16 = 1;
 136 #ifdef __LITTLE_ENDIAN__
 137   ei_status.bigendian = 0;
 138 #else
 139   ei_status.bigendian = 1;
 140 #endif
 141   ei_status.tx_start_page = START_PG;
 142   ei_status.rx_start_page = START_PG + TX_PAGES;
 143   ei_status.stop_page = STOP_PG;
 144
 145   ei_status.reset_8390 = &stnic_reset;
 146   ei_status.get_8390_hdr = &stnic_get_hdr;
 147   ei_status.block_input = &stnic_block_input;
 148   ei_status.block_output = &stnic_block_output;
 149
 150   stnic_init (dev);
 151
 152   err = register_netdev(dev);
 153   if (err) {
 154     free_irq(dev->irq, dev);
 155     free_netdev(dev);
 156     return err;
 157   }
 158   stnic_dev = dev;
 159
 160   printk (KERN_INFO "NS ST-NIC 83902A\n");
 161
 162   return 0;
 163 }
 164
 165 static void
 166 stnic_reset (struct net_device *dev)
 167 {
 168   *(vhalf *) PA_83902_RST = 0;
 169   udelay (5);
 170   if (ei_debug > 1)
 171     printk (KERN_WARNING "8390 reset done (%ld).\n", jiffies);
 172   *(vhalf *) PA_83902_RST = ~0;
 173   udelay (5);
 174 }
 175
 176 static void
 177 stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
 178                int ring_page)
 179 {
 180   half buf[2];
 181
 182   STNIC_WRITE (PG0_RSAR0, 0);
 183   STNIC_WRITE (PG0_RSAR1, ring_page);
 184   STNIC_WRITE (PG0_RBCR0, 4);
 185   STNIC_WRITE (PG0_RBCR1, 0);
 186   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 187
 188   buf[0] = *(vhalf *) PA_83902_IF;
 189   STNIC_DELAY ();
 190   buf[1] = *(vhalf *) PA_83902_IF;
 191   STNIC_DELAY ();
 192   hdr->next = buf[0] >> 8;
 193   hdr->status = buf[0] & 0xff;
 194 #ifdef __LITTLE_ENDIAN__
 195   hdr->count = buf[1];
 196 #else
 197   hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
 198 #endif
 199
 200   if (ei_debug > 1)
 201     printk (KERN_DEBUG "ring %x status %02x next %02x count %04x.\n",
 202             ring_page, hdr->status, hdr->next, hdr->count);
 203
 204   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 205 }
 206
 207 /* Block input and output, similar to the Crynwr packet driver. If you are
 208    porting to a new ethercard look at the packet driver source for hints.
 209    The HP LAN doesn't use shared memory -- we put the packet
 210    out through the "remote DMA" dataport. */
 211
 212 static void
 213 stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
 214                    int offset)
 215 {
 216   char *buf = skb->data;
 217   half val;
 218
 219   STNIC_WRITE (PG0_RSAR0, offset & 0xff);
 220   STNIC_WRITE (PG0_RSAR1, offset >> 8);
 221   STNIC_WRITE (PG0_RBCR0, length & 0xff);
 222   STNIC_WRITE (PG0_RBCR1, length >> 8);
 223   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 224
 225   if (length & 1)
 226     length++;
 227
 228   while (length > 0)
 229     {
 230       val = *(vhalf *) PA_83902_IF;
 231 #ifdef __LITTLE_ENDIAN__
 232       *buf++ = val & 0xff;
 233       *buf++ = val >> 8;
 234 #else
 235       *buf++ = val >> 8;
 236       *buf++ = val & 0xff;
 237 #endif
 238       STNIC_DELAY ();
 239       length -= sizeof (half);
 240     }
 241
 242   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 243 }
 244
 245 static void
 246 stnic_block_output (struct net_device *dev, int length,
 247                     const unsigned char *buf, int output_page)
 248 {
 249   STNIC_WRITE (PG0_RBCR0, 1);   /* Write non-zero value */
 250   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 251   STNIC_DELAY ();
 252
 253   STNIC_WRITE (PG0_RBCR0, length & 0xff);
 254   STNIC_WRITE (PG0_RBCR1, length >> 8);
 255   STNIC_WRITE (PG0_RSAR0, 0);
 256   STNIC_WRITE (PG0_RSAR1, output_page);
 257   STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
 258
 259   if (length & 1)
 260     length++;
 261
 262   while (length > 0)
 263     {
 264 #ifdef __LITTLE_ENDIAN__
 265       *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
 266 #else
 267       *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
 268 #endif
 269       STNIC_DELAY ();
 270       buf += sizeof (half);
 271       length -= sizeof (half);
 272     }
 273
 274   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 275 }
 276
 277 /* This function resets the STNIC if something screws up.  */
 278 static void
 279 stnic_init (struct net_device *dev)
 280 {
 281   stnic_reset (dev);
 282   NS8390_init (dev, 0);
 283 }
 284
 285 static void __exit stnic_cleanup(void)
 286 {
 287         unregister_netdev(stnic_dev);
 288         free_irq(stnic_dev->irq, stnic_dev);
 289         free_netdev(stnic_dev);
 290 }
 291
 292 module_init(stnic_probe);
 293 module_exit(stnic_cleanup);
 294 MODULE_LICENSE("GPL");