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/config.h>
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/ioport.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/init.h>
  19 #include <linux/delay.h>
  20
  21 #include <asm/system.h>
  22 #include <asm/io.h>
  23 #include <asm/se/se.h>
  24 #include <asm/machvec.h>
  25 #ifdef CONFIG_SH_STANDARD_BIOS
  26 #include <asm/sh_bios.h>
  27 #endif
  28
  29 #include "8390.h"
  30
  31 #define DRV_NAME "stnic"
  32
  33 #define byte    unsigned char
  34 #define half    unsigned short
  35 #define word    unsigned int
  36 #define vbyte   volatile unsigned char
  37 #define vhalf   volatile unsigned short
  38 #define vword   volatile unsigned int
  39
  40 #define STNIC_RUN       0x01    /* 1 == Run, 0 == reset. */
  41
  42 #define START_PG        0       /* First page of TX buffer */
  43 #define STOP_PG         128     /* Last page +1 of RX ring */
  44
  45 /* Alias */
  46 #define STNIC_CR        E8390_CMD
  47 #define PG0_RSAR0       EN0_RSARLO
  48 #define PG0_RSAR1       EN0_RSARHI
  49 #define PG0_RBCR0       EN0_RCNTLO
  50 #define PG0_RBCR1       EN0_RCNTHI
  51
  52 #define CR_RRD          E8390_RREAD
  53 #define CR_RWR          E8390_RWRITE
  54 #define CR_PG0          E8390_PAGE0
  55 #define CR_STA          E8390_START
  56 #define CR_RDMA         E8390_NODMA
  57
  58 /* FIXME! YOU MUST SET YOUR OWN ETHER ADDRESS.  */
  59 static byte stnic_eadr[6] =
  60 {0x00, 0xc0, 0x6e, 0x00, 0x00, 0x07};
  61
  62 static struct net_device *stnic_dev;
  63
  64 static int stnic_open (struct net_device *dev);
  65 static int stnic_close (struct net_device *dev);
  66 static void stnic_reset (struct net_device *dev);
  67 static void stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
  68                            int ring_page);
  69 static void stnic_block_input (struct net_device *dev, int count,
  70                                struct sk_buff *skb , int ring_offset);
  71 static void stnic_block_output (struct net_device *dev, int count,
  72                                 const unsigned char *buf, int start_page);
  73
  74 static void stnic_init (struct net_device *dev);
  75
  76 /* SH7750 specific read/write io. */
  77 static inline void
  78 STNIC_DELAY (void)
  79 {
  80   vword trash;
  81   trash = *(vword *) 0xa0000000;
  82   trash = *(vword *) 0xa0000000;
  83   trash = *(vword *) 0xa0000000;
  84 }
  85
  86 static inline byte
  87 STNIC_READ (int reg)
  88 {
  89   byte val;
  90
  91   val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
  92   STNIC_DELAY ();
  93   return val;
  94 }
  95
  96 static inline void
  97 STNIC_WRITE (int reg, byte val)
  98 {
  99   *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
 100   STNIC_DELAY ();
 101 }
 102 \f
 103 static int __init stnic_probe(void)
 104 {
 105   struct net_device *dev;
 106   int i, err;
 107
 108   /* If we are not running on a SolutionEngine, give up now */
 109   if (! MACH_SE)
 110     return -ENODEV;
 111
 112   /* New style probing API */
 113   dev = alloc_ei_netdev();
 114   if (!dev)
 115         return -ENOMEM;
 116   SET_MODULE_OWNER(dev);
 117
 118 #ifdef CONFIG_SH_STANDARD_BIOS
 119   sh_bios_get_node_addr (stnic_eadr);
 120 #endif
 121   for (i = 0; i < ETHER_ADDR_LEN; i++)
 122     dev->dev_addr[i] = stnic_eadr[i];
 123
 124   /* Set the base address to point to the NIC, not the "real" base! */
 125   dev->base_addr = 0x1000;
 126   dev->irq = IRQ_STNIC;
 127   dev->open = &stnic_open;
 128   dev->stop = &stnic_close;
 129 #ifdef CONFIG_NET_POLL_CONTROLLER
 130   dev->poll_controller = ei_poll;
 131 #endif
 132
 133   /* Snarf the interrupt now.  There's no point in waiting since we cannot
 134      share and the board will usually be enabled. */
 135   err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
 136   if (err)  {
 137       printk (KERN_EMERG " unable to get IRQ %d.\n", dev->irq);
 138       free_netdev(dev);
 139       return err;
 140     }
 141
 142   ei_status.name = dev->name;
 143   ei_status.word16 = 1;
 144 #ifdef __LITTLE_ENDIAN__
 145   ei_status.bigendian = 0;
 146 #else
 147   ei_status.bigendian = 1;
 148 #endif
 149   ei_status.tx_start_page = START_PG;
 150   ei_status.rx_start_page = START_PG + TX_PAGES;
 151   ei_status.stop_page = STOP_PG;
 152
 153   ei_status.reset_8390 = &stnic_reset;
 154   ei_status.get_8390_hdr = &stnic_get_hdr;
 155   ei_status.block_input = &stnic_block_input;
 156   ei_status.block_output = &stnic_block_output;
 157
 158   stnic_init (dev);
 159
 160   err = register_netdev(dev);
 161   if (err) {
 162     free_irq(dev->irq, dev);
 163     free_netdev(dev);
 164     return err;
 165   }
 166   stnic_dev = dev;
 167
 168   printk (KERN_INFO "NS ST-NIC 83902A\n");
 169
 170   return 0;
 171 }
 172
 173 static int
 174 stnic_open (struct net_device *dev)
 175 {
 176 #if 0
 177   printk (KERN_DEBUG "stnic open\n");
 178 #endif
 179   ei_open (dev);
 180   return 0;
 181 }
 182
 183 static int
 184 stnic_close (struct net_device *dev)
 185 {
 186   ei_close (dev);
 187   return 0;
 188 }
 189
 190 static void
 191 stnic_reset (struct net_device *dev)
 192 {
 193   *(vhalf *) PA_83902_RST = 0;
 194   udelay (5);
 195   if (ei_debug > 1)
 196     printk (KERN_WARNING "8390 reset done (%ld).\n", jiffies);
 197   *(vhalf *) PA_83902_RST = ~0;
 198   udelay (5);
 199 }
 200
 201 static void
 202 stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
 203                int ring_page)
 204 {
 205   half buf[2];
 206
 207   STNIC_WRITE (PG0_RSAR0, 0);
 208   STNIC_WRITE (PG0_RSAR1, ring_page);
 209   STNIC_WRITE (PG0_RBCR0, 4);
 210   STNIC_WRITE (PG0_RBCR1, 0);
 211   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 212
 213   buf[0] = *(vhalf *) PA_83902_IF;
 214   STNIC_DELAY ();
 215   buf[1] = *(vhalf *) PA_83902_IF;
 216   STNIC_DELAY ();
 217   hdr->next = buf[0] >> 8;
 218   hdr->status = buf[0] & 0xff;
 219 #ifdef __LITTLE_ENDIAN__
 220   hdr->count = buf[1];
 221 #else
 222   hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
 223 #endif
 224
 225   if (ei_debug > 1)
 226     printk (KERN_DEBUG "ring %x status %02x next %02x count %04x.\n",
 227             ring_page, hdr->status, hdr->next, hdr->count);
 228
 229   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 230 }
 231
 232 /* Block input and output, similar to the Crynwr packet driver. If you are
 233    porting to a new ethercard look at the packet driver source for hints.
 234    The HP LAN doesn't use shared memory -- we put the packet
 235    out through the "remote DMA" dataport. */
 236
 237 static void
 238 stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
 239                    int offset)
 240 {
 241   char *buf = skb->data;
 242   half val;
 243
 244   STNIC_WRITE (PG0_RSAR0, offset & 0xff);
 245   STNIC_WRITE (PG0_RSAR1, offset >> 8);
 246   STNIC_WRITE (PG0_RBCR0, length & 0xff);
 247   STNIC_WRITE (PG0_RBCR1, length >> 8);
 248   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 249
 250   if (length & 1)
 251     length++;
 252
 253   while (length > 0)
 254     {
 255       val = *(vhalf *) PA_83902_IF;
 256 #ifdef __LITTLE_ENDIAN__
 257       *buf++ = val & 0xff;
 258       *buf++ = val >> 8;
 259 #else
 260       *buf++ = val >> 8;
 261       *buf++ = val & 0xff;
 262 #endif
 263       STNIC_DELAY ();
 264       length -= sizeof (half);
 265     }
 266
 267   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 268 }
 269
 270 static void
 271 stnic_block_output (struct net_device *dev, int length,
 272                     const unsigned char *buf, int output_page)
 273 {
 274   STNIC_WRITE (PG0_RBCR0, 1);   /* Write non-zero value */
 275   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 276   STNIC_DELAY ();
 277
 278   STNIC_WRITE (PG0_RBCR0, length & 0xff);
 279   STNIC_WRITE (PG0_RBCR1, length >> 8);
 280   STNIC_WRITE (PG0_RSAR0, 0);
 281   STNIC_WRITE (PG0_RSAR1, output_page);
 282   STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
 283
 284   if (length & 1)
 285     length++;
 286
 287   while (length > 0)
 288     {
 289 #ifdef __LITTLE_ENDIAN__
 290       *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
 291 #else
 292       *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
 293 #endif
 294       STNIC_DELAY ();
 295       buf += sizeof (half);
 296       length -= sizeof (half);
 297     }
 298
 299   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 300 }
 301
 302 /* This function resets the STNIC if something screws up.  */
 303 static void
 304 stnic_init (struct net_device *dev)
 305 {
 306   stnic_reset (dev);
 307   NS8390_init (dev, 0);
 308   return;
 309 }
 310
 311 static void __exit stnic_cleanup(void)
 312 {
 313         unregister_netdev(stnic_dev);
 314         free_irq(stnic_dev->irq, stnic_dev);
 315         free_netdev(stnic_dev);
 316 }
 317
 318 module_init(stnic_probe);
 319 module_exit(stnic_cleanup);
 320 MODULE_LICENSE("GPL");