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