drivers/net/ibm_newemac/rgmii.c

   1 /*
   2  * drivers/net/ibm_newemac/rgmii.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
   5  *
   6  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   7  *                <benh@kernel.crashing.org>
   8  *
   9  * Based on the arch/ppc version of the driver:
  10  *
  11  * Copyright (c) 2004, 2005 Zultys Technologies.
  12  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13  *
  14  * Based on original work by
  15  *      Matt Porter <mporter@kernel.crashing.org>
  16  *      Copyright 2004 MontaVista Software, Inc.
  17  *
  18  * This program is free software; you can redistribute  it and/or modify it
  19  * under  the terms of  the GNU General  Public License as published by the
  20  * Free Software Foundation;  either version 2 of the  License, or (at your
  21  * option) any later version.
  22  *
  23  */
  24 #include <linux/kernel.h>
  25 #include <linux/ethtool.h>
  26 #include <asm/io.h>
  27
  28 #include "emac.h"
  29 #include "debug.h"
  30
  31 // XXX FIXME: Axon seems to support a subset of the RGMII, we
  32 // thus need to take that into account and possibly change some
  33 // of the bit settings below that don't seem to quite match the
  34 // AXON spec
  35
  36 /* RGMIIx_FER */
  37 #define RGMII_FER_MASK(idx)     (0x7 << ((idx) * 4))
  38 #define RGMII_FER_RTBI(idx)     (0x4 << ((idx) * 4))
  39 #define RGMII_FER_RGMII(idx)    (0x5 << ((idx) * 4))
  40 #define RGMII_FER_TBI(idx)      (0x6 << ((idx) * 4))
  41 #define RGMII_FER_GMII(idx)     (0x7 << ((idx) * 4))
  42
  43 /* RGMIIx_SSR */
  44 #define RGMII_SSR_MASK(idx)     (0x7 << ((idx) * 8))
  45 #define RGMII_SSR_100(idx)      (0x2 << ((idx) * 8))
  46 #define RGMII_SSR_1000(idx)     (0x4 << ((idx) * 8))
  47
  48 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
  49 static inline int rgmii_valid_mode(int phy_mode)
  50 {
  51         return  phy_mode == PHY_MODE_GMII ||
  52                 phy_mode == PHY_MODE_RGMII ||
  53                 phy_mode == PHY_MODE_TBI ||
  54                 phy_mode == PHY_MODE_RTBI;
  55 }
  56
  57 static inline const char *rgmii_mode_name(int mode)
  58 {
  59         switch (mode) {
  60         case PHY_MODE_RGMII:
  61                 return "RGMII";
  62         case PHY_MODE_TBI:
  63                 return "TBI";
  64         case PHY_MODE_GMII:
  65                 return "GMII";
  66         case PHY_MODE_RTBI:
  67                 return "RTBI";
  68         default:
  69                 BUG();
  70         }
  71 }
  72
  73 static inline u32 rgmii_mode_mask(int mode, int input)
  74 {
  75         switch (mode) {
  76         case PHY_MODE_RGMII:
  77                 return RGMII_FER_RGMII(input);
  78         case PHY_MODE_TBI:
  79                 return RGMII_FER_TBI(input);
  80         case PHY_MODE_GMII:
  81                 return RGMII_FER_GMII(input);
  82         case PHY_MODE_RTBI:
  83                 return RGMII_FER_RTBI(input);
  84         default:
  85                 BUG();
  86         }
  87 }
  88
  89 int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
  90 {
  91         struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
  92         struct rgmii_regs __iomem *p = dev->base;
  93
  94         RGMII_DBG(dev, "attach(%d)" NL, input);
  95
  96         /* Check if we need to attach to a RGMII */
  97         if (input < 0 || !rgmii_valid_mode(mode)) {
  98                 printk(KERN_ERR "%s: unsupported settings !\n",
  99                        ofdev->node->full_name);
 100                 return -ENODEV;
 101         }
 102
 103         mutex_lock(&dev->lock);
 104
 105         /* Enable this input */
 106         out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
 107
 108         printk(KERN_NOTICE "%s: input %d in %s mode\n",
 109                ofdev->node->full_name, input, rgmii_mode_name(mode));
 110
 111         ++dev->users;
 112
 113         mutex_unlock(&dev->lock);
 114
 115         return 0;
 116 }
 117
 118 void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
 119 {
 120         struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 121         struct rgmii_regs __iomem *p = dev->base;
 122         u32 ssr;
 123
 124         mutex_lock(&dev->lock);
 125
 126         ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
 127
 128         RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
 129
 130         if (speed == SPEED_1000)
 131                 ssr |= RGMII_SSR_1000(input);
 132         else if (speed == SPEED_100)
 133                 ssr |= RGMII_SSR_100(input);
 134
 135         out_be32(&p->ssr, ssr);
 136
 137         mutex_unlock(&dev->lock);
 138 }
 139
 140 void rgmii_get_mdio(struct of_device *ofdev, int input)
 141 {
 142         struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 143         struct rgmii_regs __iomem *p = dev->base;
 144         u32 fer;
 145
 146         RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
 147
 148         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 149                 return;
 150
 151         mutex_lock(&dev->lock);
 152
 153         fer = in_be32(&p->fer);
 154         fer |= 0x00080000u >> input;
 155         out_be32(&p->fer, fer);
 156         (void)in_be32(&p->fer);
 157
 158         DBG2(dev, " fer = 0x%08x\n", fer);
 159 }
 160
 161 void rgmii_put_mdio(struct of_device *ofdev, int input)
 162 {
 163         struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 164         struct rgmii_regs __iomem *p = dev->base;
 165         u32 fer;
 166
 167         RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
 168
 169         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 170                 return;
 171
 172         fer = in_be32(&p->fer);
 173         fer &= ~(0x00080000u >> input);
 174         out_be32(&p->fer, fer);
 175         (void)in_be32(&p->fer);
 176
 177         DBG2(dev, " fer = 0x%08x\n", fer);
 178
 179         mutex_unlock(&dev->lock);
 180 }
 181
 182 void rgmii_detach(struct of_device *ofdev, int input)
 183 {
 184         struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 185         struct rgmii_regs __iomem *p = dev->base;
 186
 187         mutex_lock(&dev->lock);
 188
 189         BUG_ON(!dev || dev->users == 0);
 190
 191         RGMII_DBG(dev, "detach(%d)" NL, input);
 192
 193         /* Disable this input */
 194         out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
 195
 196         --dev->users;
 197
 198         mutex_unlock(&dev->lock);
 199 }
 200
 201 int rgmii_get_regs_len(struct of_device *ofdev)
 202 {
 203         return sizeof(struct emac_ethtool_regs_subhdr) +
 204                 sizeof(struct rgmii_regs);
 205 }
 206
 207 void *rgmii_dump_regs(struct of_device *ofdev, void *buf)
 208 {
 209         struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 210         struct emac_ethtool_regs_subhdr *hdr = buf;
 211         struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
 212
 213         hdr->version = 0;
 214         hdr->index = 0; /* for now, are there chips with more than one
 215                          * rgmii ? if yes, then we'll add a cell_index
 216                          * like we do for emac
 217                          */
 218         memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
 219         return regs + 1;
 220 }
 221
 222
 223 static int __devinit rgmii_probe(struct of_device *ofdev,
 224                                  const struct of_device_id *match)
 225 {
 226         struct device_node *np = ofdev->node;
 227         struct rgmii_instance *dev;
 228         struct resource regs;
 229         int rc;
 230
 231         rc = -ENOMEM;
 232         dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
 233         if (dev == NULL) {
 234                 printk(KERN_ERR "%s: could not allocate RGMII device!\n",
 235                        np->full_name);
 236                 goto err_gone;
 237         }
 238
 239         mutex_init(&dev->lock);
 240         dev->ofdev = ofdev;
 241
 242         rc = -ENXIO;
 243         if (of_address_to_resource(np, 0, &regs)) {
 244                 printk(KERN_ERR "%s: Can't get registers address\n",
 245                        np->full_name);
 246                 goto err_free;
 247         }
 248
 249         rc = -ENOMEM;
 250         dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
 251                                                  sizeof(struct rgmii_regs));
 252         if (dev->base == NULL) {
 253                 printk(KERN_ERR "%s: Can't map device registers!\n",
 254                        np->full_name);
 255                 goto err_free;
 256         }
 257
 258         /* Check for RGMII flags */
 259         if (of_get_property(ofdev->node, "has-mdio", NULL))
 260                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
 261
 262         /* CAB lacks the right properties, fix this up */
 263         if (of_device_is_compatible(ofdev->node, "ibm,rgmii-axon"))
 264                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
 265
 266         DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
 267              in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
 268
 269         /* Disable all inputs by default */
 270         out_be32(&dev->base->fer, 0);
 271
 272         printk(KERN_INFO
 273                "RGMII %s initialized with%s MDIO support\n",
 274                ofdev->node->full_name,
 275                (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
 276
 277         wmb();
 278         dev_set_drvdata(&ofdev->dev, dev);
 279
 280         return 0;
 281
 282  err_free:
 283         kfree(dev);
 284  err_gone:
 285         return rc;
 286 }
 287
 288 static int __devexit rgmii_remove(struct of_device *ofdev)
 289 {
 290         struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 291
 292         dev_set_drvdata(&ofdev->dev, NULL);
 293
 294         WARN_ON(dev->users != 0);
 295
 296         iounmap(dev->base);
 297         kfree(dev);
 298
 299         return 0;
 300 }
 301
 302 static struct of_device_id rgmii_match[] =
 303 {
 304         {
 305                 .compatible     = "ibm,rgmii",
 306         },
 307         {
 308                 .type           = "emac-rgmii",
 309         },
 310         {},
 311 };
 312
 313 static struct of_platform_driver rgmii_driver = {
 314         .name = "emac-rgmii",
 315         .match_table = rgmii_match,
 316
 317         .probe = rgmii_probe,
 318         .remove = rgmii_remove,
 319 };
 320
 321 int __init rgmii_init(void)
 322 {
 323         return of_register_platform_driver(&rgmii_driver);
 324 }
 325
 326 void rgmii_exit(void)
 327 {
 328         of_unregister_platform_driver(&rgmii_driver);
 329 }