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