drivers/net/ethernet/natsemi/xtsonic.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * xtsonic.c
   4  *
   5  * (C) 2001 - 2007 Tensilica Inc.
   6  *      Kevin Chea <kchea@yahoo.com>
   7  *      Marc Gauthier <marc@linux-xtensa.org>
   8  *      Chris Zankel <chris@zankel.net>
   9  *
  10  * (C) 1996,1998 by Thomas Bogendoerfer (tsbogend@alpha.franken.de)
  11  *
  12  * This driver is based on work from Andreas Busse, but most of
  13  * the code is rewritten.
  14  *
  15  * (C) 1995 by Andreas Busse (andy@waldorf-gmbh.de)
  16  *
  17  * A driver for the onboard Sonic ethernet controller on the XT2000.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/fcntl.h>
  24 #include <linux/gfp.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/in.h>
  29 #include <linux/string.h>
  30 #include <linux/delay.h>
  31 #include <linux/errno.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/dma-mapping.h>
  37 #include <linux/slab.h>
  38
  39 #include <asm/io.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/dma.h>
  42
  43 static char xtsonic_string[] = "xtsonic";
  44
  45 extern unsigned xtboard_nvram_valid(void);
  46 extern void xtboard_get_ether_addr(unsigned char *buf);
  47
  48 #include "sonic.h"
  49
  50 /*
  51  * According to the documentation for the Sonic ethernet controller,
  52  * EOBC should be 760 words (1520 bytes) for 32-bit applications, and,
  53  * as such, 2 words less than the buffer size. The value for RBSIZE
  54  * defined in sonic.h, however is only 1520.
  55  *
  56  * (Note that in 16-bit configurations, EOBC is 759 words (1518 bytes) and
  57  * RBSIZE 1520 bytes)
  58  */
  59 #undef SONIC_RBSIZE
  60 #define SONIC_RBSIZE    1524
  61
  62 /*
  63  * The chip provides 256 byte register space.
  64  */
  65 #define SONIC_MEM_SIZE  0x100
  66
  67 /*
  68  * Macros to access SONIC registers
  69  */
  70 #define SONIC_READ(reg) \
  71         (0xffff & *((volatile unsigned int *)dev->base_addr+reg))
  72
  73 #define SONIC_WRITE(reg,val) \
  74         *((volatile unsigned int *)dev->base_addr+reg) = val
  75
  76 /*
  77  * We cannot use station (ethernet) address prefixes to detect the
  78  * sonic controller since these are board manufacturer depended.
  79  * So we check for known Silicon Revision IDs instead.
  80  */
  81 static unsigned short known_revisions[] =
  82 {
  83         0x101,                  /* SONIC 83934 */
  84         0xffff                  /* end of list */
  85 };
  86
  87 static int xtsonic_open(struct net_device *dev)
  88 {
  89         int retval;
  90
  91         retval = request_irq(dev->irq, sonic_interrupt, 0, "sonic", dev);
  92         if (retval) {
  93                 printk(KERN_ERR "%s: unable to get IRQ %d.\n",
  94                        dev->name, dev->irq);
  95                 return -EAGAIN;
  96         }
  97
  98         retval = sonic_open(dev);
  99         if (retval)
 100                 free_irq(dev->irq, dev);
 101         return retval;
 102 }
 103
 104 static int xtsonic_close(struct net_device *dev)
 105 {
 106         int err;
 107         err = sonic_close(dev);
 108         free_irq(dev->irq, dev);
 109         return err;
 110 }
 111
 112 static const struct net_device_ops xtsonic_netdev_ops = {
 113         .ndo_open               = xtsonic_open,
 114         .ndo_stop               = xtsonic_close,
 115         .ndo_start_xmit         = sonic_send_packet,
 116         .ndo_get_stats          = sonic_get_stats,
 117         .ndo_set_rx_mode        = sonic_multicast_list,
 118         .ndo_tx_timeout         = sonic_tx_timeout,
 119         .ndo_validate_addr      = eth_validate_addr,
 120         .ndo_set_mac_address    = eth_mac_addr,
 121 };
 122
 123 static int __init sonic_probe1(struct net_device *dev)
 124 {
 125         unsigned int silicon_revision;
 126         struct sonic_local *lp = netdev_priv(dev);
 127         unsigned int base_addr = dev->base_addr;
 128         int i;
 129         int err = 0;
 130
 131         if (!request_mem_region(base_addr, 0x100, xtsonic_string))
 132                 return -EBUSY;
 133
 134         /*
 135          * get the Silicon Revision ID. If this is one of the known
 136          * one assume that we found a SONIC ethernet controller at
 137          * the expected location.
 138          */
 139         silicon_revision = SONIC_READ(SONIC_SR);
 140         i = 0;
 141         while ((known_revisions[i] != 0xffff) &&
 142                         (known_revisions[i] != silicon_revision))
 143                 i++;
 144
 145         if (known_revisions[i] == 0xffff) {
 146                 pr_info("SONIC ethernet controller not found (0x%4x)\n",
 147                         silicon_revision);
 148                 return -ENODEV;
 149         }
 150
 151         /*
 152          * Put the sonic into software reset, then retrieve ethernet address.
 153          * Note: we are assuming that the boot-loader has initialized the cam.
 154          */
 155         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
 156         SONIC_WRITE(SONIC_DCR,
 157                     SONIC_DCR_WC0|SONIC_DCR_DW|SONIC_DCR_LBR|SONIC_DCR_SBUS);
 158         SONIC_WRITE(SONIC_CEP,0);
 159         SONIC_WRITE(SONIC_IMR,0);
 160
 161         SONIC_WRITE(SONIC_CMD,SONIC_CR_RST);
 162         SONIC_WRITE(SONIC_CEP,0);
 163
 164         for (i=0; i<3; i++) {
 165                 unsigned int 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         /* Initialize the device structure. */
 171
 172         lp->dma_bitmode = SONIC_BITMODE32;
 173
 174         /*
 175          *  Allocate local private descriptor areas in uncached space.
 176          *  The entire structure must be located within the same 64kb segment.
 177          *  A simple way to ensure this is to allocate twice the
 178          *  size of the structure -- given that the structure is
 179          *  much less than 64 kB, at least one of the halves of
 180          *  the allocated area will be contained entirely in 64 kB.
 181          *  We also allocate extra space for a pointer to allow freeing
 182          *  this structure later on (in xtsonic_cleanup_module()).
 183          */
 184         lp->descriptors = dma_alloc_coherent(lp->device,
 185                                              SIZEOF_SONIC_DESC *
 186                                              SONIC_BUS_SCALE(lp->dma_bitmode),
 187                                              &lp->descriptors_laddr,
 188                                              GFP_KERNEL);
 189         if (lp->descriptors == NULL) {
 190                 err = -ENOMEM;
 191                 goto out;
 192         }
 193
 194         lp->cda = lp->descriptors;
 195         lp->tda = lp->cda + (SIZEOF_SONIC_CDA
 196                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 197         lp->rda = lp->tda + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
 198                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 199         lp->rra = lp->rda + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 200                              * SONIC_BUS_SCALE(lp->dma_bitmode));
 201
 202         /* get the virtual dma address */
 203
 204         lp->cda_laddr = lp->descriptors_laddr;
 205         lp->tda_laddr = lp->cda_laddr + (SIZEOF_SONIC_CDA
 206                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 207         lp->rda_laddr = lp->tda_laddr + (SIZEOF_SONIC_TD * SONIC_NUM_TDS
 208                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 209         lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 210                                          * SONIC_BUS_SCALE(lp->dma_bitmode));
 211
 212         dev->netdev_ops         = &xtsonic_netdev_ops;
 213         dev->watchdog_timeo     = TX_TIMEOUT;
 214
 215         /*
 216          * clear tally counter
 217          */
 218         SONIC_WRITE(SONIC_CRCT,0xffff);
 219         SONIC_WRITE(SONIC_FAET,0xffff);
 220         SONIC_WRITE(SONIC_MPT,0xffff);
 221
 222         return 0;
 223 out:
 224         release_region(dev->base_addr, SONIC_MEM_SIZE);
 225         return err;
 226 }
 227
 228
 229 /*
 230  * Probe for a SONIC ethernet controller on an XT2000 board.
 231  * Actually probing is superfluous but we're paranoid.
 232  */
 233
 234 int xtsonic_probe(struct platform_device *pdev)
 235 {
 236         struct net_device *dev;
 237         struct sonic_local *lp;
 238         struct resource *resmem, *resirq;
 239         int err = 0;
 240
 241         if ((resmem = platform_get_resource(pdev, IORESOURCE_MEM, 0)) == NULL)
 242                 return -ENODEV;
 243
 244         if ((resirq = platform_get_resource(pdev, IORESOURCE_IRQ, 0)) == NULL)
 245                 return -ENODEV;
 246
 247         if ((dev = alloc_etherdev(sizeof(struct sonic_local))) == NULL)
 248                 return -ENOMEM;
 249
 250         lp = netdev_priv(dev);
 251         lp->device = &pdev->dev;
 252         platform_set_drvdata(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
 262         pr_info("SONIC ethernet @%08lx, MAC %pM, IRQ %d\n",
 263                 dev->base_addr, dev->dev_addr, dev->irq);
 264
 265         sonic_msg_init(dev);
 266
 267         if ((err = register_netdev(dev)))
 268                 goto out1;
 269
 270         return 0;
 271
 272 out1:
 273         release_region(dev->base_addr, SONIC_MEM_SIZE);
 274 out:
 275         free_netdev(dev);
 276
 277         return err;
 278 }
 279
 280 MODULE_DESCRIPTION("Xtensa XT2000 SONIC ethernet driver");
 281
 282 #include "sonic.c"
 283
 284 static int xtsonic_device_remove(struct platform_device *pdev)
 285 {
 286         struct net_device *dev = platform_get_drvdata(pdev);
 287         struct sonic_local *lp = netdev_priv(dev);
 288
 289         unregister_netdev(dev);
 290         dma_free_coherent(lp->device,
 291                           SIZEOF_SONIC_DESC * SONIC_BUS_SCALE(lp->dma_bitmode),
 292                           lp->descriptors, lp->descriptors_laddr);
 293         release_region (dev->base_addr, SONIC_MEM_SIZE);
 294         free_netdev(dev);
 295
 296         return 0;
 297 }
 298
 299 static struct platform_driver xtsonic_driver = {
 300         .probe = xtsonic_probe,
 301         .remove = xtsonic_device_remove,
 302         .driver = {
 303                 .name = xtsonic_string,
 304         },
 305 };
 306
 307 module_platform_driver(xtsonic_driver);