drivers/net/jazzsonic.c

   1 /*
   2  * sonic.c
   3  *
   4  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
   5  *
   6  * This driver is based on work from Andreas Busse, but most of
   7  * the code is rewritten.
   8  *
   9  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
  10  *
  11  * A driver for the onboard Sonic ethernet controller on Mips Jazz
  12  * systems (Acer Pica-61, Mips Magnum 4000, Olivetti M700 and
  13  * perhaps others, too)
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/types.h>
  18 #include <linux/fcntl.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/init.h>
  21 #include <linux/ioport.h>
  22 #include <linux/in.h>
  23 #include <linux/slab.h>
  24 #include <linux/string.h>
  25 #include <linux/delay.h>
  26 #include <linux/errno.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/skbuff.h>
  30
  31 #include <asm/bootinfo.h>
  32 #include <asm/system.h>
  33 #include <asm/bitops.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/io.h>
  36 #include <asm/dma.h>
  37 #include <asm/jazz.h>
  38 #include <asm/jazzdma.h>
  39
  40 #define SREGS_PAD(n)    u16 n;
  41
  42 #include "sonic.h"
  43
  44 /*
  45  * Macros to access SONIC registers
  46  */
  47 #define SONIC_READ(reg) (*((volatile unsigned int *)base_addr+reg))
  48
  49 #define SONIC_WRITE(reg,val)                                            \
  50 do {                                                                    \
  51         *((volatile unsigned int *)base_addr+reg) = val;                \
  52 }
  53
  54
  55 /* use 0 for production, 1 for verification, >2 for debug */
  56 #ifdef SONIC_DEBUG
  57 static unsigned int sonic_debug = SONIC_DEBUG;
  58 #else
  59 static unsigned int sonic_debug = 1;
  60 #endif
  61
  62 /*
  63  * Base address and interrupt of the SONIC controller on JAZZ boards
  64  */
  65 static struct {
  66         unsigned int port;
  67         unsigned int irq;
  68 } sonic_portlist[] = { {JAZZ_ETHERNET_BASE, JAZZ_ETHERNET_IRQ}, {0, 0}};
  69
  70 /*
  71  * We cannot use station (ethernet) address prefixes to detect the
  72  * sonic controller since these are board manufacturer depended.
  73  * So we check for known Silicon Revision IDs instead.
  74  */
  75 static unsigned short known_revisions[] =
  76 {
  77         0x04,                   /* Mips Magnum 4000 */
  78         0xffff                  /* end of list */
  79 };
  80
  81 /* Index to functions, as function prototypes. */
  82
  83 extern int sonic_probe(struct net_device *dev);
  84 static int sonic_probe1(struct net_device *dev, unsigned int base_addr,
  85                         unsigned int irq);
  86
  87
  88 /*
  89  * Probe for a SONIC ethernet controller on a Mips Jazz board.
  90  * Actually probing is superfluous but we're paranoid.
  91  */
  92 int __init sonic_probe(struct net_device *dev)
  93 {
  94         unsigned int base_addr = dev ? dev->base_addr : 0;
  95         int i;
  96
  97         /*
  98          * Don't probe if we're not running on a Jazz board.
  99          */
 100         if (mips_machgroup != MACH_GROUP_JAZZ)
 101                 return -ENODEV;
 102         if (base_addr >= KSEG0) /* Check a single specified location. */
 103                 return sonic_probe1(dev, base_addr, dev->irq);
 104         else if (base_addr != 0)        /* Don't probe at all. */
 105                 return -ENXIO;
 106
 107         for (i = 0; sonic_portlist[i].port; i++) {
 108                 int base_addr = sonic_portlist[i].port;
 109                 if (check_region(base_addr, 0x100))
 110                         continue;
 111                 if (sonic_probe1(dev, base_addr, sonic_portlist[i].irq) == 0)
 112                         return 0;
 113         }
 114         return -ENODEV;
 115 }
 116
 117 static int __init sonic_probe1(struct net_device *dev, unsigned int base_addr,
 118                                unsigned int irq)
 119 {
 120         static unsigned version_printed;
 121         unsigned int silicon_revision;
 122         unsigned int val;
 123         struct sonic_local *lp;
 124         int i;
 125
 126         /*
 127          * get the Silicon Revision ID. If this is one of the known
 128          * one assume that we found a SONIC ethernet controller at
 129          * the expected location.
 130          */
 131         silicon_revision = SONIC_READ(SONIC_SR);
 132         if (sonic_debug > 1)
 133                 printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
 134
 135         i = 0;
 136         while (known_revisions[i] != 0xffff
 137                && known_revisions[i] != silicon_revision)
 138                 i++;
 139
 140         if (known_revisions[i] == 0xffff) {
 141                 printk("SONIC ethernet controller not found (0x%4x)\n",
 142                        silicon_revision);
 143                 return -ENODEV;
 144         }
 145
 146         if (!request_region(base_addr, 0x100, dev->name))
 147                 return -EBUSY;
 148
 149         if (sonic_debug  &&  version_printed++ == 0)
 150                 printk(version);
 151
 152         printk("%s: Sonic ethernet found at 0x%08lx, ", dev->name, base_addr);
 153
 154         /* Fill in the 'dev' fields. */
 155         dev->base_addr = base_addr;
 156         dev->irq = irq;
 157
 158         /*
 159          * Put the sonic into software reset, then
 160          * retrieve and print the ethernet address.
 161          */
 162         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
 163         SONIC_WRITE(SONIC_CEP,0);
 164         for (i=0; i<3; i++) {
 165                 val = SONIC_READ(SONIC_CAP0-i);
 166                 dev->dev_addr[i*2] = val;
 167                 dev->dev_addr[i*2+1] = val >> 8;
 168         }
 169
 170         printk("HW Address ");
 171         for (i = 0; i < 6; i++) {
 172                 printk("%2.2x", dev->dev_addr[i]);
 173                 if (i<5)
 174                         printk(":");
 175         }
 176
 177         printk(" IRQ %d\n", irq);
 178
 179         /* Initialize the device structure. */
 180         if (dev->priv == NULL) {
 181                 /*
 182                  * the memory be located in the same 64kb segment
 183                  */
 184                 lp = NULL;
 185                 i = 0;
 186                 do {
 187                         lp = kmalloc(sizeof(*lp), GFP_KERNEL);
 188                         if ((unsigned long) lp >> 16
 189                             != ((unsigned long)lp + sizeof(*lp) ) >> 16) {
 190                                 /* FIXME, free the memory later */
 191                                 kfree(lp);
 192                                 lp = NULL;
 193                         }
 194                 } while (lp == NULL && i++ < 20);
 195
 196                 if (lp == NULL) {
 197                         printk("%s: couldn't allocate memory for descriptors\n",
 198                                dev->name);
 199                         return -ENOMEM;
 200                 }
 201
 202                 memset(lp, 0, sizeof(struct sonic_local));
 203
 204                 /* get the virtual dma address */
 205                 lp->cda_laddr = vdma_alloc(PHYSADDR(lp),sizeof(*lp));
 206                 if (lp->cda_laddr == ~0UL) {
 207                         printk("%s: couldn't get DMA page entry for "
 208                                "descriptors\n", dev->name);
 209                         return -ENOMEM;
 210                 }
 211
 212                 lp->tda_laddr = lp->cda_laddr + sizeof (lp->cda);
 213                 lp->rra_laddr = lp->tda_laddr + sizeof (lp->tda);
 214                 lp->rda_laddr = lp->rra_laddr + sizeof (lp->rra);
 215
 216                 /* allocate receive buffer area */
 217                 /* FIXME, maybe we should use skbs */
 218                 lp->rba = kmalloc(SONIC_NUM_RRS * SONIC_RBSIZE, GFP_KERNEL);
 219                 if (!lp->rba) {
 220                         printk("%s: couldn't allocate receive buffers\n",
 221                                dev->name);
 222                         return -ENOMEM;
 223                 }
 224
 225                 /* get virtual dma address */
 226                 lp->rba_laddr = vdma_alloc(PHYSADDR(lp->rba),
 227                                            SONIC_NUM_RRS * SONIC_RBSIZE);
 228                 if (lp->rba_laddr == ~0UL) {
 229                         printk("%s: couldn't get DMA page entry for receive "
 230                                "buffers\n",dev->name);
 231                         return -ENOMEM;
 232                 }
 233
 234                 /* now convert pointer to KSEG1 pointer */
 235                 lp->rba = (char *)KSEG1ADDR(lp->rba);
 236                 flush_cache_all();
 237                 dev->priv = (struct sonic_local *)KSEG1ADDR(lp);
 238         }
 239
 240         lp = (struct sonic_local *)dev->priv;
 241         dev->open = sonic_open;
 242         dev->stop = sonic_close;
 243         dev->hard_start_xmit = sonic_send_packet;
 244         dev->get_stats  = sonic_get_stats;
 245         dev->set_multicast_list = &sonic_multicast_list;
 246         dev->watchdog_timeo = TX_TIMEOUT;
 247
 248         /*
 249          * clear tally counter
 250          */
 251         SONIC_WRITE(SONIC_CRCT,0xffff);
 252         SONIC_WRITE(SONIC_FAET,0xffff);
 253         SONIC_WRITE(SONIC_MPT,0xffff);
 254
 255         /* Fill in the fields of the device structure with ethernet values. */
 256         ether_setup(dev);
 257         return 0;
 258 }
 259
 260 /*
 261  *      SONIC uses a normal IRQ
 262  */
 263 #define sonic_request_irq       request_irq
 264 #define sonic_free_irq          free_irq
 265
 266 #define sonic_chiptomem(x)      KSEG1ADDR(vdma_log2phys(x))
 267
 268 #include "sonic.c"