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 int __init sonic_probe1(struct net_device *dev)
 112 {
 113         static unsigned version_printed = 0;
 114         unsigned int silicon_revision;
 115         struct sonic_local *lp = netdev_priv(dev);
 116         unsigned int base_addr = dev->base_addr;
 117         int i;
 118         int err = 0;
 119
 120         if (!request_mem_region(base_addr, 0x100, xtsonic_string))
 121                 return -EBUSY;
 122
 123         /*
 124          * get the Silicon Revision ID. If this is one of the known
 125          * one assume that we found a SONIC ethernet controller at
 126          * the expected location.
 127          */
 128         silicon_revision = SONIC_READ(SONIC_SR);
 129         if (sonic_debug > 1)
 130                 printk("SONIC Silicon Revision = 0x%04x\n",silicon_revision);
 131
 132         i = 0;
 133         while ((known_revisions[i] != 0xffff) &&
 134                         (known_revisions[i] != silicon_revision))
 135                 i++;
 136
 137         if (known_revisions[i] == 0xffff) {
 138                 printk("SONIC ethernet controller not found (0x%4x)\n",
 139                                 silicon_revision);
 140                 return -ENODEV;
 141         }
 142
 143         if (sonic_debug  &&  version_printed++ == 0)
 144                 printk(version);
 145
 146         /*
 147          * Put the sonic into software reset, then retrieve ethernet address.
 148          * Note: we are assuming that the boot-loader has initialized the cam.
 149          */
 150         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
 151         SONIC_WRITE(SONIC_DCR,
 152                     SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
 153         SONIC_WRITE(SONIC_CEP,0);
 154         SONIC_WRITE(SONIC_IMR,0);
 155
 156         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
 157         SONIC_WRITE(SONIC_CEP,0);
 158
 159         for (i=0; i<3; i++) {
 160                 unsigned int val = SONIC_READ(SONIC_CAP0-i);
 161                 dev->dev_addr[i*2] = val;
 162                 dev->dev_addr[i*2+1] = val >> 8;
 163         }
 164
 165         /* Initialize the device structure. */
 166
 167         lp->dma_bitmode = SONIC_BITMODE32;
 168
 169         /*
 170          *  Allocate local private descriptor areas in uncached space.
 171          *  The entire structure must be located within the same 64kb segment.
 172          *  A simple way to ensure this is to allocate twice the
 173          *  size of the structure -- given that the structure is
 174          *  much less than 64 kB, at least one of the halves of
 175          *  the allocated area will be contained entirely in 64 kB.
 176          *  We also allocate extra space for a pointer to allow freeing
 177          *  this structure later on (in xtsonic_cleanup_module()).
 178          */
 179         lp->descriptors =
 180                 dma_alloc_coherent(lp->device,
 181                         SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
 182                         &lp->descriptors_laddr, GFP_KERNEL);
 183
 184         if (lp->descriptors == NULL) {
 185                 printk(KERN_ERR "%s: couldn't alloc DMA memory for "
 186                                 " descriptors.\n", lp->device->bus_id);
 187                 goto out;
 188         }
 189
 190         lp->cda = lp->descriptors;
 191         lp->tda = lp->cda + (SIZEOF_SONIC_CDA
 192                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 193         lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
 194                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 195         lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 196                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 197
 198         /* get the virtual dma address */
 199
 200         lp->cda_laddr = lp->descriptors_laddr;
 201         lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
 202                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 203         lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
 204                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 205         lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 206                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 207
 208         dev->open = xtsonic_open;
 209         dev->stop = xtsonic_close;
 210         dev->hard_start_xmit    = sonic_send_packet;
 211         dev->get_stats          = sonic_get_stats;
 212         dev->set_multicast_list = &sonic_multicast_list;
 213         dev->tx_timeout         = sonic_tx_timeout;
 214         dev->watchdog_timeo     = TX_TIMEOUT;
 215
 216         /*
 217          * clear tally counter
 218          */
 219         SONIC_WRITE(SONIC_CRCT,0xffff);
 220         SONIC_WRITE(SONIC_FAET,0xffff);
 221         SONIC_WRITE(SONIC_MPT,0xffff);
 222
 223         return 0;
 224 out:
 225         release_region(dev->base_addr, SONIC_MEM_SIZE);
 226         return err;
 227 }
 228
 229
 230 /*
 231  * Probe for a SONIC ethernet controller on an XT2000 board.
 232  * Actually probing is superfluous but we're paranoid.
 233  */
 234
 235 int __init xtsonic_probe(struct platform_device *pdev)
 236 {
 237         struct net_device *dev;
 238         struct sonic_local *lp;
 239         struct resource *resmem, *resirq;
 240         int err = 0;
 241
 242         if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
 243                 return -ENODEV;
 244
 245         if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
 246                 return -ENODEV;
 247
 248         if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
 249                 return -ENOMEM;
 250
 251         lp = netdev_priv(dev);
 252         lp->device = &pdev->dev;
 253         SET_NETDEV_DEV(dev, &pdev->dev);
 254         netdev_boot_setup_check(dev);
 255
 256         dev->base_addr = resmem->start;
 257         dev->irq = resirq->start;
 258
 259         if ((err = sonic_probe1(dev)))
 260                 goto out;
 261         if ((err = register_netdev(dev)))
 262                 goto out1;
 263
 264         printk("%s: SONIC ethernet @%08lx, MAC %pM, IRQ %d\n", dev->name,
 265                dev->base_addr, dev->dev_addr, dev->irq);
 266
 267         return 0;
 268
 269 out1:
 270         release_region(dev->base_addr, SONIC_MEM_SIZE);
 271 out:
 272         free_netdev(dev);
 273
 274         return err;
 275 }
 276
 277 MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
 278 module_param(sonic_debug, int, 0);
 279 MODULE_PARM_DESC(sonic_debug, "xtsonic debug level (1-4)");
 280
 281 #include "sonic.c"
 282
 283 static int __devexit xtsonic_device_remove (struct platform_device *pdev)
 284 {
 285         struct net_device *dev = platform_get_drvdata(pdev);
 286         struct sonic_local *lp = netdev_priv(dev);
 287
 288         unregister_netdev(dev);
 289         dma_free_coherent(lp->device,
 290                           SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
 291                           lp->descriptors, lp->descriptors_laddr);
 292         release_region (dev->base_addr, SONIC_MEM_SIZE);
 293         free_netdev(dev);
 294
 295         return 0;
 296 }
 297
 298 static struct platform_driver xtsonic_driver = {
 299         .probe = xtsonic_probe,
 300         .remove = __devexit_p(xtsonic_device_remove),
 301         .driver = {
 302                 .name = xtsonic_string,
 303         },
 304 };
 305
 306 static int __init xtsonic_init(void)
 307 {
 308         return platform_driver_register(&xtsonic_driver);
 309 }
 310
 311 static void __exit xtsonic_cleanup(void)
 312 {
 313         platform_driver_unregister(&xtsonic_driver);
 314 }
 315
 316 module_init(xtsonic_init);
 317 module_exit(xtsonic_cleanup);