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