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 static u32 stnic_msg_enable;
  73
  74 module_param_named(msg_enable, stnic_msg_enable, uint, 0444);
  75 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");
  76
  77 /* SH7750 specific read/write io. */
  78 static inline void
  79 STNIC_DELAY (void)
  80 {
  81   vword trash;
  82   trash = *(vword *) 0xa0000000;
  83   trash = *(vword *) 0xa0000000;
  84   trash = *(vword *) 0xa0000000;
  85 }
  86
  87 static inline byte
  88 STNIC_READ (int reg)
  89 {
  90   byte val;
  91
  92   val = (*(vhalf *) (PA_83902 + ((reg) << 1)) >> 8) & 0xff;
  93   STNIC_DELAY ();
  94   return val;
  95 }
  96
  97 static inline void
  98 STNIC_WRITE (int reg, byte val)
  99 {
 100   *(vhalf *) (PA_83902 + ((reg) << 1)) = ((half) (val) << 8);
 101   STNIC_DELAY ();
 102 }
 103
 104 static int __init stnic_probe(void)
 105 {
 106   struct net_device *dev;
 107   int i, err;
 108   struct ei_device *ei_local;
 109
 110   /* If we are not running on a SolutionEngine, give up now */
 111   if (! MACH_SE)
 112     return -ENODEV;
 113
 114   /* New style probing API */
 115   dev = alloc_ei_netdev();
 116   if (!dev)
 117         return -ENOMEM;
 118
 119 #ifdef CONFIG_SH_STANDARD_BIOS
 120   sh_bios_get_node_addr (stnic_eadr);
 121 #endif
 122   for (i = 0; i < ETH_ALEN; i++)
 123     dev->dev_addr[i] = stnic_eadr[i];
 124
 125   /* Set the base address to point to the NIC, not the "real" base! */
 126   dev->base_addr = 0x1000;
 127   dev->irq = IRQ_STNIC;
 128   dev->netdev_ops = &ei_netdev_ops;
 129
 130   /* Snarf the interrupt now.  There's no point in waiting since we cannot
 131      share and the board will usually be enabled. */
 132   err = request_irq (dev->irq, ei_interrupt, 0, DRV_NAME, dev);
 133   if (err)  {
 134         netdev_emerg(dev, " unable to get IRQ %d.\n", dev->irq);
 135         free_netdev(dev);
 136         return err;
 137   }
 138
 139   ei_status.name = dev->name;
 140   ei_status.word16 = 1;
 141 #ifdef __LITTLE_ENDIAN__
 142   ei_status.bigendian = 0;
 143 #else
 144   ei_status.bigendian = 1;
 145 #endif
 146   ei_status.tx_start_page = START_PG;
 147   ei_status.rx_start_page = START_PG + TX_PAGES;
 148   ei_status.stop_page = STOP_PG;
 149
 150   ei_status.reset_8390 = &stnic_reset;
 151   ei_status.get_8390_hdr = &stnic_get_hdr;
 152   ei_status.block_input = &stnic_block_input;
 153   ei_status.block_output = &stnic_block_output;
 154
 155   stnic_init (dev);
 156   ei_local = netdev_priv(dev);
 157   ei_local->msg_enable = stnic_msg_enable;
 158
 159   err = register_netdev(dev);
 160   if (err) {
 161     free_irq(dev->irq, dev);
 162     free_netdev(dev);
 163     return err;
 164   }
 165   stnic_dev = dev;
 166
 167   netdev_info(dev, "NS ST-NIC 83902A\n");
 168
 169   return 0;
 170 }
 171
 172 static void
 173 stnic_reset (struct net_device *dev)
 174 {
 175   struct ei_device *ei_local = netdev_priv(dev);
 176
 177   *(vhalf *) PA_83902_RST = 0;
 178   udelay (5);
 179   netif_warn(ei_local, hw, dev, "8390 reset done (%ld).\n", jiffies);
 180   *(vhalf *) PA_83902_RST = ~0;
 181   udelay (5);
 182 }
 183
 184 static void
 185 stnic_get_hdr (struct net_device *dev, struct e8390_pkt_hdr *hdr,
 186                int ring_page)
 187 {
 188   struct ei_device *ei_local = netdev_priv(dev);
 189
 190   half buf[2];
 191
 192   STNIC_WRITE (PG0_RSAR0, 0);
 193   STNIC_WRITE (PG0_RSAR1, ring_page);
 194   STNIC_WRITE (PG0_RBCR0, 4);
 195   STNIC_WRITE (PG0_RBCR1, 0);
 196   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 197
 198   buf[0] = *(vhalf *) PA_83902_IF;
 199   STNIC_DELAY ();
 200   buf[1] = *(vhalf *) PA_83902_IF;
 201   STNIC_DELAY ();
 202   hdr->next = buf[0] >> 8;
 203   hdr->status = buf[0] & 0xff;
 204 #ifdef __LITTLE_ENDIAN__
 205   hdr->count = buf[1];
 206 #else
 207   hdr->count = ((buf[1] >> 8) & 0xff) | (buf[1] << 8);
 208 #endif
 209
 210   netif_dbg(ei_local, probe, dev, "ring %x status %02x next %02x count %04x.\n",
 211             ring_page, hdr->status, hdr->next, hdr->count);
 212
 213   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 214 }
 215
 216 /* Block input and output, similar to the Crynwr packet driver. If you are
 217    porting to a new ethercard look at the packet driver source for hints.
 218    The HP LAN doesn't use shared memory -- we put the packet
 219    out through the "remote DMA" dataport. */
 220
 221 static void
 222 stnic_block_input (struct net_device *dev, int length, struct sk_buff *skb,
 223                    int offset)
 224 {
 225   char *buf = skb->data;
 226   half val;
 227
 228   STNIC_WRITE (PG0_RSAR0, offset & 0xff);
 229   STNIC_WRITE (PG0_RSAR1, offset >> 8);
 230   STNIC_WRITE (PG0_RBCR0, length & 0xff);
 231   STNIC_WRITE (PG0_RBCR1, length >> 8);
 232   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 233
 234   if (length & 1)
 235     length++;
 236
 237   while (length > 0)
 238     {
 239       val = *(vhalf *) PA_83902_IF;
 240 #ifdef __LITTLE_ENDIAN__
 241       *buf++ = val & 0xff;
 242       *buf++ = val >> 8;
 243 #else
 244       *buf++ = val >> 8;
 245       *buf++ = val & 0xff;
 246 #endif
 247       STNIC_DELAY ();
 248       length -= sizeof (half);
 249     }
 250
 251   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 252 }
 253
 254 static void
 255 stnic_block_output (struct net_device *dev, int length,
 256                     const unsigned char *buf, int output_page)
 257 {
 258   STNIC_WRITE (PG0_RBCR0, 1);   /* Write non-zero value */
 259   STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
 260   STNIC_DELAY ();
 261
 262   STNIC_WRITE (PG0_RBCR0, length & 0xff);
 263   STNIC_WRITE (PG0_RBCR1, length >> 8);
 264   STNIC_WRITE (PG0_RSAR0, 0);
 265   STNIC_WRITE (PG0_RSAR1, output_page);
 266   STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
 267
 268   if (length & 1)
 269     length++;
 270
 271   while (length > 0)
 272     {
 273 #ifdef __LITTLE_ENDIAN__
 274       *(vhalf *) PA_83902_IF = ((half) buf[1] << 8) | buf[0];
 275 #else
 276       *(vhalf *) PA_83902_IF = ((half) buf[0] << 8) | buf[1];
 277 #endif
 278       STNIC_DELAY ();
 279       buf += sizeof (half);
 280       length -= sizeof (half);
 281     }
 282
 283   STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
 284 }
 285
 286 /* This function resets the STNIC if something screws up.  */
 287 static void
 288 stnic_init (struct net_device *dev)
 289 {
 290   stnic_reset (dev);
 291   NS8390_init (dev, 0);
 292 }
 293
 294 static void __exit stnic_cleanup(void)
 295 {
 296         unregister_netdev(stnic_dev);
 297         free_irq(stnic_dev->irq, stnic_dev);
 298         free_netdev(stnic_dev);
 299 }
 300
 301 module_init(stnic_probe);
 302 module_exit(stnic_cleanup);
 303 MODULE_LICENSE("GPL");