drivers/net/ethernet/ibm/emac/rgmii.c

   1 /*
   2  * drivers/net/ethernet/ibm/emac/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/slab.h>
  25 #include <linux/kernel.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/of_address.h>
  28 #include <asm/io.h>
  29
  30 #include "emac.h"
  31 #include "debug.h"
  32
  33 // XXX FIXME: Axon seems to support a subset of the RGMII, we
  34 // thus need to take that into account and possibly change some
  35 // of the bit settings below that don't seem to quite match the
  36 // AXON spec
  37
  38 /* RGMIIx_FER */
  39 #define RGMII_FER_MASK(idx)     (0x7 << ((idx) * 4))
  40 #define RGMII_FER_RTBI(idx)     (0x4 << ((idx) * 4))
  41 #define RGMII_FER_RGMII(idx)    (0x5 << ((idx) * 4))
  42 #define RGMII_FER_TBI(idx)      (0x6 << ((idx) * 4))
  43 #define RGMII_FER_GMII(idx)     (0x7 << ((idx) * 4))
  44 #define RGMII_FER_MII(idx)      RGMII_FER_GMII(idx)
  45
  46 /* RGMIIx_SSR */
  47 #define RGMII_SSR_MASK(idx)     (0x7 << ((idx) * 8))
  48 #define RGMII_SSR_10(idx)       (0x1 << ((idx) * 8))
  49 #define RGMII_SSR_100(idx)      (0x2 << ((idx) * 8))
  50 #define RGMII_SSR_1000(idx)     (0x4 << ((idx) * 8))
  51
  52 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
  53 static inline int rgmii_valid_mode(int phy_mode)
  54 {
  55         return  phy_mode == PHY_MODE_GMII ||
  56                 phy_mode == PHY_MODE_MII ||
  57                 phy_mode == PHY_MODE_RGMII ||
  58                 phy_mode == PHY_MODE_TBI ||
  59                 phy_mode == PHY_MODE_RTBI;
  60 }
  61
  62 static inline const char *rgmii_mode_name(int mode)
  63 {
  64         switch (mode) {
  65         case PHY_MODE_RGMII:
  66                 return "RGMII";
  67         case PHY_MODE_TBI:
  68                 return "TBI";
  69         case PHY_MODE_GMII:
  70                 return "GMII";
  71         case PHY_MODE_MII:
  72                 return "MII";
  73         case PHY_MODE_RTBI:
  74                 return "RTBI";
  75         default:
  76                 BUG();
  77         }
  78 }
  79
  80 static inline u32 rgmii_mode_mask(int mode, int input)
  81 {
  82         switch (mode) {
  83         case PHY_MODE_RGMII:
  84                 return RGMII_FER_RGMII(input);
  85         case PHY_MODE_TBI:
  86                 return RGMII_FER_TBI(input);
  87         case PHY_MODE_GMII:
  88                 return RGMII_FER_GMII(input);
  89         case PHY_MODE_MII:
  90                 return RGMII_FER_MII(input);
  91         case PHY_MODE_RTBI:
  92                 return RGMII_FER_RTBI(input);
  93         default:
  94                 BUG();
  95         }
  96 }
  97
  98 int rgmii_attach(struct platform_device *ofdev, int input, int mode)
  99 {
 100         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 101         struct rgmii_regs __iomem *p = dev->base;
 102
 103         RGMII_DBG(dev, "attach(%d)" NL, input);
 104
 105         /* Check if we need to attach to a RGMII */
 106         if (input < 0 || !rgmii_valid_mode(mode)) {
 107                 printk(KERN_ERR "%s: unsupported settings !\n",
 108                        ofdev->dev.of_node->full_name);
 109                 return -ENODEV;
 110         }
 111
 112         mutex_lock(&dev->lock);
 113
 114         /* Enable this input */
 115         out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
 116
 117         printk(KERN_NOTICE "%s: input %d in %s mode\n",
 118                ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));
 119
 120         ++dev->users;
 121
 122         mutex_unlock(&dev->lock);
 123
 124         return 0;
 125 }
 126
 127 void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
 128 {
 129         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 130         struct rgmii_regs __iomem *p = dev->base;
 131         u32 ssr;
 132
 133         mutex_lock(&dev->lock);
 134
 135         ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
 136
 137         RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
 138
 139         if (speed == SPEED_1000)
 140                 ssr |= RGMII_SSR_1000(input);
 141         else if (speed == SPEED_100)
 142                 ssr |= RGMII_SSR_100(input);
 143         else if (speed == SPEED_10)
 144                 ssr |= RGMII_SSR_10(input);
 145
 146         out_be32(&p->ssr, ssr);
 147
 148         mutex_unlock(&dev->lock);
 149 }
 150
 151 void rgmii_get_mdio(struct platform_device *ofdev, int input)
 152 {
 153         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 154         struct rgmii_regs __iomem *p = dev->base;
 155         u32 fer;
 156
 157         RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
 158
 159         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 160                 return;
 161
 162         mutex_lock(&dev->lock);
 163
 164         fer = in_be32(&p->fer);
 165         fer |= 0x00080000u >> input;
 166         out_be32(&p->fer, fer);
 167         (void)in_be32(&p->fer);
 168
 169         DBG2(dev, " fer = 0x%08x\n", fer);
 170 }
 171
 172 void rgmii_put_mdio(struct platform_device *ofdev, int input)
 173 {
 174         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 175         struct rgmii_regs __iomem *p = dev->base;
 176         u32 fer;
 177
 178         RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
 179
 180         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 181                 return;
 182
 183         fer = in_be32(&p->fer);
 184         fer &= ~(0x00080000u >> input);
 185         out_be32(&p->fer, fer);
 186         (void)in_be32(&p->fer);
 187
 188         DBG2(dev, " fer = 0x%08x\n", fer);
 189
 190         mutex_unlock(&dev->lock);
 191 }
 192
 193 void rgmii_detach(struct platform_device *ofdev, int input)
 194 {
 195         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 196         struct rgmii_regs __iomem *p;
 197
 198         BUG_ON(!dev || dev->users == 0);
 199         p = dev->base;
 200
 201         mutex_lock(&dev->lock);
 202
 203         RGMII_DBG(dev, "detach(%d)" NL, input);
 204
 205         /* Disable this input */
 206         out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
 207
 208         --dev->users;
 209
 210         mutex_unlock(&dev->lock);
 211 }
 212
 213 int rgmii_get_regs_len(struct platform_device *ofdev)
 214 {
 215         return sizeof(struct emac_ethtool_regs_subhdr) +
 216                 sizeof(struct rgmii_regs);
 217 }
 218
 219 void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
 220 {
 221         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 222         struct emac_ethtool_regs_subhdr *hdr = buf;
 223         struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
 224
 225         hdr->version = 0;
 226         hdr->index = 0; /* for now, are there chips with more than one
 227                          * rgmii ? if yes, then we'll add a cell_index
 228                          * like we do for emac
 229                          */
 230         memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
 231         return regs + 1;
 232 }
 233
 234
 235 static int rgmii_probe(struct platform_device *ofdev)
 236 {
 237         struct device_node *np = ofdev->dev.of_node;
 238         struct rgmii_instance *dev;
 239         struct resource regs;
 240         int rc;
 241
 242         rc = -ENOMEM;
 243         dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
 244         if (dev == NULL)
 245                 goto err_gone;
 246
 247         mutex_init(&dev->lock);
 248         dev->ofdev = ofdev;
 249
 250         rc = -ENXIO;
 251         if (of_address_to_resource(np, 0, &regs)) {
 252                 printk(KERN_ERR "%s: Can't get registers address\n",
 253                        np->full_name);
 254                 goto err_free;
 255         }
 256
 257         rc = -ENOMEM;
 258         dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
 259                                                  sizeof(struct rgmii_regs));
 260         if (dev->base == NULL) {
 261                 printk(KERN_ERR "%s: Can't map device registers!\n",
 262                        np->full_name);
 263                 goto err_free;
 264         }
 265
 266         /* Check for RGMII flags */
 267         if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
 268                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
 269
 270         /* CAB lacks the right properties, fix this up */
 271         if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
 272                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
 273
 274         DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
 275              in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
 276
 277         /* Disable all inputs by default */
 278         out_be32(&dev->base->fer, 0);
 279
 280         printk(KERN_INFO
 281                "RGMII %s initialized with%s MDIO support\n",
 282                ofdev->dev.of_node->full_name,
 283                (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
 284
 285         wmb();
 286         platform_set_drvdata(ofdev, dev);
 287
 288         return 0;
 289
 290  err_free:
 291         kfree(dev);
 292  err_gone:
 293         return rc;
 294 }
 295
 296 static int rgmii_remove(struct platform_device *ofdev)
 297 {
 298         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 299
 300         WARN_ON(dev->users != 0);
 301
 302         iounmap(dev->base);
 303         kfree(dev);
 304
 305         return 0;
 306 }
 307
 308 static const struct of_device_id rgmii_match[] =
 309 {
 310         {
 311                 .compatible     = "ibm,rgmii",
 312         },
 313         {
 314                 .type           = "emac-rgmii",
 315         },
 316         {},
 317 };
 318
 319 static struct platform_driver rgmii_driver = {
 320         .driver = {
 321                 .name = "emac-rgmii",
 322                 .of_match_table = rgmii_match,
 323         },
 324         .probe = rgmii_probe,
 325         .remove = rgmii_remove,
 326 };
 327
 328 int __init rgmii_init(void)
 329 {
 330         return platform_driver_register(&rgmii_driver);
 331 }
 332
 333 void rgmii_exit(void)
 334 {
 335         platform_driver_unregister(&rgmii_driver);
 336 }