drivers/net/xtsonic.c

   1 /*
   2  * xtsonic.c
   3  *
   4  * (C) 2001 - 2007 Tensilica Inc.
   5  *      Kevin Chea <kchea@yahoo.com>
   6  *      Marc Gauthier <marc@linux-xtensa.org>
   7  *      Chris Zankel <chris@zankel.net>
   8  *
   9  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  10  *
  11  * This driver is based on work from Andreas Busse, but most of
  12  * the code is rewritten.
  13  *
  14  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
  15  *
  16  * A driver for the onboard Sonic ethernet controller on the XT2000.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/fcntl.h>
  23 #include <linux/gfp.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/init.h>
  26 #include <linux/ioport.h>
  27 #include <linux/in.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/errno.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/dma-mapping.h>
  36 #include <linux/slab.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/dma.h>
  41
  42 static char xtsonic_string[] = "xtsonic";
  43
  44 extern unsigned xtboard_nvram_valid(void);
  45 extern void xtboard_get_ether_addr(unsigned char *buf);
  46
  47 #include "sonic.h"
  48
  49 /*
  50  * According to the documentation for the Sonic ethernet controller,
  51  * EOBC should be 760 words (1520 bytes) for 32-bit applications, and,
  52  * as such, 2 words less than the buffer size. The value for RBSIZE
  53  * defined in sonic.h, however is only 1520.
  54  *
  55  * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and
  56  * RBSIZE 1520 bytes)
  57  */
  58 #undef SONIC_RBSIZE
  59 #define SONIC_RBSIZE    1524
  60
  61 /*
  62  * The chip provides 256 byte register space.
  63  */
  64 #define SONIC_MEM_SIZE  0x100
  65
  66 /*
  67  * Macros to access SONIC registers
  68  */
  69 #define SONIC_READ(reg) \
  70         (0xffff & *((volatile unsigned int *)dev->base_addr+reg))
  71
  72 #define SONIC_WRITE(reg,val) \
  73         *((volatile unsigned int *)dev->base_addr+reg) = val
  74
  75
  76 /* Use 0 for production, 1 for verification, and >2 for debug */
  77 #ifdef SONIC_DEBUG
  78 static unsigned int sonic_debug = SONIC_DEBUG;
  79 #else
  80 static unsigned int sonic_debug = 1;
  81 #endif
  82
  83 /*
  84  * We cannot use station (ethernet) address prefixes to detect the
  85  * sonic controller since these are board manufacturer depended.
  86  * So we check for known Silicon Revision IDs instead.
  87  */
  88 static unsigned short known_revisions[] =
  89 {
  90         0x101,                  /* SONIC 83934 */
  91         0xffff                  /* end of list */
  92 };
  93
  94 static int xtsonic_open(struct net_device *dev)
  95 {
  96         int retval;
  97
  98         retval = request_irq(dev->irq, sonic_interrupt, IRQF_DISABLED,
  99                                 "sonic", dev);
 100         if (retval) {
 101                 printk(KERN_ERR "%s: unable to get IRQ %d.\n",
 102                        dev->name, dev->irq);
 103                 return -EAGAIN;
 104         }
 105
 106         retval = sonic_open(dev);
 107         if (retval)
 108                 free_irq(dev->irq, dev);
 109         return retval;
 110 }
 111
 112 static int xtsonic_close(struct net_device *dev)
 113 {
 114         int err;
 115         err = sonic_close(dev);
 116         free_irq(dev->irq, dev);
 117         return err;
 118 }
 119
 120 static const struct net_device_ops xtsonic_netdev_ops = {
 121         .ndo_open               = xtsonic_open,
 122         .ndo_stop               = xtsonic_close,
 123         .ndo_start_xmit         = sonic_send_packet,
 124         .ndo_get_stats          = sonic_get_stats,
 125         .ndo_set_multicast_list = sonic_multicast_list,
 126         .ndo_tx_timeout         = sonic_tx_timeout,
 127         .ndo_validate_addr      = eth_validate_addr,
 128         .ndo_change_mtu         = eth_change_mtu,
 129         .ndo_set_mac_address    = eth_mac_addr,
 130 };
 131
 132 static int __init sonic_probe1(struct net_device *dev)
 133 {
 134         static unsigned version_printed = 0;
 135         unsigned int silicon_revision;
 136         struct sonic_local *lp = netdev_priv(dev);
 137         unsigned int base_addr = dev->base_addr;
 138         int i;
 139         int err = 0;
 140
 141         if (!request_mem_region(base_addr, 0x100, xtsonic_string))
 142                 return -EBUSY;
 143
 144         /*
 145          * get the Silicon Revision ID. If this is one of the known
 146          * one assume that we found a SONIC ethernet controller at
 147          * the expected location.
 148          */
 149         silicon_revision = SONIC_READ(SONIC_SR);
 150         if (sonic_debug > 1)
 151                 printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
 152
 153         i = 0;
 154         while ((known_revisions[i] != 0xffff) &&
 155                         (known_revisions[i] != silicon_revision))
 156                 i++;
 157
 158         if (known_revisions[i] == 0xffff) {
 159                 printk("SONIC ethernet controller not found (0x%4x)\n",
 160                                 silicon_revision);
 161                 return -ENODEV;
 162         }
 163
 164         if (sonic_debug  &&  version_printed++ == 0)
 165                 printk(version);
 166
 167         /*
 168          * Put the sonic into software reset, then retrieve ethernet address.
 169          * Note: we are assuming that the boot-loader has initialized the cam.
 170          */
 171         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
 172         SONIC_WRITE(SONIC_DCR,
 173                     SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
 174         SONIC_WRITE(SONIC_CEP,0);
 175         SONIC_WRITE(SONIC_IMR,0);
 176
 177         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
 178         SONIC_WRITE(SONIC_CEP,0);
 179
 180         for (i=0; i<3; i++) {
 181                 unsigned int val = SONIC_READ(SONIC_CAP0-i);
 182                 dev->dev_addr[i*2] = val;
 183                 dev->dev_addr[i*2+1] = val >> 8;
 184         }
 185
 186         /* Initialize the device structure. */
 187
 188         lp->dma_bitmode = SONIC_BITMODE32;
 189
 190         /*
 191          *  Allocate local private descriptor areas in uncached space.
 192          *  The entire structure must be located within the same 64kb segment.
 193          *  A simple way to ensure this is to allocate twice the
 194          *  size of the structure -- given that the structure is
 195          *  much less than 64 kB, at least one of the halves of
 196          *  the allocated area will be contained entirely in 64 kB.
 197          *  We also allocate extra space for a pointer to allow freeing
 198          *  this structure later on (in xtsonic_cleanup_module()).
 199          */
 200         lp->descriptors =
 201                 dma_alloc_coherent(lp->device,
 202                         SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
 203                         &lp->descriptors_laddr, GFP_KERNEL);
 204
 205         if (lp->descriptors == NULL) {
 206                 printk(KERN_ERR "%s: couldn't alloc DMA memory for "
 207                                 " descriptors.\n", dev_name(lp->device));
 208                 goto out;
 209         }
 210
 211         lp->cda = lp->descriptors;
 212         lp->tda = lp->cda + (SIZEOF_SONIC_CDA
 213                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 214         lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
 215                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 216         lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 217                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 218
 219         /* get the virtual dma address */
 220
 221         lp->cda_laddr = lp->descriptors_laddr;
 222         lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
 223                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 224         lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
 225                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 226         lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 227                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 228
 229         dev->netdev_ops         = &xtsonic_netdev_ops;
 230         dev->watchdog_timeo     = TX_TIMEOUT;
 231
 232         /*
 233          * clear tally counter
 234          */
 235         SONIC_WRITE(SONIC_CRCT,0xffff);
 236         SONIC_WRITE(SONIC_FAET,0xffff);
 237         SONIC_WRITE(SONIC_MPT,0xffff);
 238
 239         return 0;
 240 out:
 241         release_region(dev->base_addr, SONIC_MEM_SIZE);
 242         return err;
 243 }
 244
 245
 246 /*
 247  * Probe for a SONIC ethernet controller on an XT2000 board.
 248  * Actually probing is superfluous but we're paranoid.
 249  */
 250
 251 int __devinit xtsonic_probe(struct platform_device *pdev)
 252 {
 253         struct net_device *dev;
 254         struct sonic_local *lp;
 255         struct resource *resmem, *resirq;
 256         int err = 0;
 257
 258         if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
 259                 return -ENODEV;
 260
 261         if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
 262                 return -ENODEV;
 263
 264         if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
 265                 return -ENOMEM;
 266
 267         lp = netdev_priv(dev);
 268         lp->device = &pdev->dev;
 269         SET_NETDEV_DEV(dev, &pdev->dev);
 270         netdev_boot_setup_check(dev);
 271
 272         dev->base_addr = resmem->start;
 273         dev->irq = resirq->start;
 274
 275         if ((err = sonic_probe1(dev)))
 276                 goto out;
 277         if ((err = register_netdev(dev)))
 278                 goto out1;
 279
 280         printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name,
 281                dev->base_addr, dev->dev_addr, dev->irq);
 282
 283         return 0;
 284
 285 out1:
 286         release_region(dev->base_addr, SONIC_MEM_SIZE);
 287 out:
 288         free_netdev(dev);
 289
 290         return err;
 291 }
 292
 293 MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
 294 module_param(sonic_debug, int, 0);
 295 MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)");
 296
 297 #include "sonic.c"
 298
 299 static int __devexit xtsonic_device_remove (struct platform_device *pdev)
 300 {
 301         struct net_device *dev = platform_get_drvdata(pdev);
 302         struct sonic_local *lp = netdev_priv(dev);
 303
 304         unregister_netdev(dev);
 305         dma_free_coherent(lp->device,
 306                           SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
 307                           lp->descriptors, lp->descriptors_laddr);
 308         release_region (dev->base_addr, SONIC_MEM_SIZE);
 309         free_netdev(dev);
 310
 311         return 0;
 312 }
 313
 314 static struct platform_driver xtsonic_driver = {
 315         .probe = xtsonic_probe,
 316         .remove = __devexit_p(xtsonic_device_remove),
 317         .driver = {
 318                 .name = xtsonic_string,
 319         },
 320 };
 321
 322 static int __init xtsonic_init(void)
 323 {
 324         return platform_driver_register(&xtsonic_driver);
 325 }
 326
 327 static void __exit xtsonic_cleanup(void)
 328 {
 329         platform_driver_unregister(&xtsonic_driver);
 330 }
 331
 332 module_init(xtsonic_init);
 333 module_exit(xtsonic_cleanup);