drivers/net/ibm_newemac/zmii.c

   1 /*
   2  * drivers/net/ibm_newemac/zmii.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller, ZMII 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  *      Armin Kuster <akuster@mvista.com>
  16  *      Copyright 2001 MontaVista Softare 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 "core.h"
  30
  31 /* ZMIIx_FER */
  32 #define ZMII_FER_MDI(idx)       (0x80000000 >> ((idx) * 4))
  33 #define ZMII_FER_MDI_ALL        (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
  34                                  ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
  35
  36 #define ZMII_FER_SMII(idx)      (0x40000000 >> ((idx) * 4))
  37 #define ZMII_FER_RMII(idx)      (0x20000000 >> ((idx) * 4))
  38 #define ZMII_FER_MII(idx)       (0x10000000 >> ((idx) * 4))
  39
  40 /* ZMIIx_SSR */
  41 #define ZMII_SSR_SCI(idx)       (0x40000000 >> ((idx) * 4))
  42 #define ZMII_SSR_FSS(idx)       (0x20000000 >> ((idx) * 4))
  43 #define ZMII_SSR_SP(idx)        (0x10000000 >> ((idx) * 4))
  44
  45 /* ZMII only supports MII, RMII and SMII
  46  * we also support autodetection for backward compatibility
  47  */
  48 static inline int zmii_valid_mode(int mode)
  49 {
  50         return  mode == PHY_MODE_MII ||
  51                 mode == PHY_MODE_RMII ||
  52                 mode == PHY_MODE_SMII ||
  53                 mode == PHY_MODE_NA;
  54 }
  55
  56 static inline const char *zmii_mode_name(int mode)
  57 {
  58         switch (mode) {
  59         case PHY_MODE_MII:
  60                 return "MII";
  61         case PHY_MODE_RMII:
  62                 return "RMII";
  63         case PHY_MODE_SMII:
  64                 return "SMII";
  65         default:
  66                 BUG();
  67         }
  68 }
  69
  70 static inline u32 zmii_mode_mask(int mode, int input)
  71 {
  72         switch (mode) {
  73         case PHY_MODE_MII:
  74                 return ZMII_FER_MII(input);
  75         case PHY_MODE_RMII:
  76                 return ZMII_FER_RMII(input);
  77         case PHY_MODE_SMII:
  78                 return ZMII_FER_SMII(input);
  79         default:
  80                 return 0;
  81         }
  82 }
  83
  84 int __devinit zmii_attach(struct of_device *ofdev, int input, int *mode)
  85 {
  86         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
  87         struct zmii_regs __iomem *p = dev->base;
  88
  89         ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
  90
  91         if (!zmii_valid_mode(*mode)) {
  92                 /* Probably an EMAC connected to RGMII,
  93                  * but it still may need ZMII for MDIO so
  94                  * we don't fail here.
  95                  */
  96                 dev->users++;
  97                 return 0;
  98         }
  99
 100         mutex_lock(&dev->lock);
 101
 102         /* Autodetect ZMII mode if not specified.
 103          * This is only for backward compatibility with the old driver.
 104          * Please, always specify PHY mode in your board port to avoid
 105          * any surprises.
 106          */
 107         if (dev->mode == PHY_MODE_NA) {
 108                 if (*mode == PHY_MODE_NA) {
 109                         u32 r = dev->fer_save;
 110
 111                         ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
 112
 113                         if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
 114                                 dev->mode = PHY_MODE_MII;
 115                         else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
 116                                 dev->mode = PHY_MODE_RMII;
 117                         else
 118                                 dev->mode = PHY_MODE_SMII;
 119                 } else
 120                         dev->mode = *mode;
 121
 122                 printk(KERN_NOTICE "%s: bridge in %s mode\n",
 123                        ofdev->node->full_name, zmii_mode_name(dev->mode));
 124         } else {
 125                 /* All inputs must use the same mode */
 126                 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
 127                         printk(KERN_ERR
 128                                "%s: invalid mode %d specified for input %d\n",
 129                                ofdev->node->full_name, *mode, input);
 130                         mutex_unlock(&dev->lock);
 131                         return -EINVAL;
 132                 }
 133         }
 134
 135         /* Report back correct PHY mode,
 136          * it may be used during PHY initialization.
 137          */
 138         *mode = dev->mode;
 139
 140         /* Enable this input */
 141         out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
 142         ++dev->users;
 143
 144         mutex_unlock(&dev->lock);
 145
 146         return 0;
 147 }
 148
 149 void zmii_get_mdio(struct of_device *ofdev, int input)
 150 {
 151         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 152         u32 fer;
 153
 154         ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
 155
 156         mutex_lock(&dev->lock);
 157
 158         fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
 159         out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
 160 }
 161
 162 void zmii_put_mdio(struct of_device *ofdev, int input)
 163 {
 164         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 165
 166         ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
 167         mutex_unlock(&dev->lock);
 168 }
 169
 170
 171 void zmii_set_speed(struct of_device *ofdev, int input, int speed)
 172 {
 173         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 174         u32 ssr;
 175
 176         mutex_lock(&dev->lock);
 177
 178         ssr = in_be32(&dev->base->ssr);
 179
 180         ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
 181
 182         if (speed == SPEED_100)
 183                 ssr |= ZMII_SSR_SP(input);
 184         else
 185                 ssr &= ~ZMII_SSR_SP(input);
 186
 187         out_be32(&dev->base->ssr, ssr);
 188
 189         mutex_unlock(&dev->lock);
 190 }
 191
 192 void __devexit zmii_detach(struct of_device *ofdev, int input)
 193 {
 194         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 195
 196         BUG_ON(!dev || dev->users == 0);
 197
 198         mutex_lock(&dev->lock);
 199
 200         ZMII_DBG(dev, "detach(%d)" NL, input);
 201
 202         /* Disable this input */
 203         out_be32(&dev->base->fer,
 204                  in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
 205
 206         --dev->users;
 207
 208         mutex_unlock(&dev->lock);
 209 }
 210
 211 int zmii_get_regs_len(struct of_device *ofdev)
 212 {
 213         return sizeof(struct emac_ethtool_regs_subhdr) +
 214                 sizeof(struct zmii_regs);
 215 }
 216
 217 void *zmii_dump_regs(struct of_device *ofdev, void *buf)
 218 {
 219         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 220         struct emac_ethtool_regs_subhdr *hdr = buf;
 221         struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
 222
 223         hdr->version = 0;
 224         hdr->index = 0; /* for now, are there chips with more than one
 225                          * zmii ? if yes, then we'll add a cell_index
 226                          * like we do for emac
 227                          */
 228         memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
 229         return regs + 1;
 230 }
 231
 232 static int __devinit zmii_probe(struct of_device *ofdev,
 233                                 const struct of_device_id *match)
 234 {
 235         struct device_node *np = ofdev->node;
 236         struct zmii_instance *dev;
 237         struct resource regs;
 238         int rc;
 239
 240         rc = -ENOMEM;
 241         dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
 242         if (dev == NULL) {
 243                 printk(KERN_ERR "%s: could not allocate ZMII device!\n",
 244                        np->full_name);
 245                 goto err_gone;
 246         }
 247
 248         mutex_init(&dev->lock);
 249         dev->ofdev = ofdev;
 250         dev->mode = PHY_MODE_NA;
 251
 252         rc = -ENXIO;
 253         if (of_address_to_resource(np, 0, &regs)) {
 254                 printk(KERN_ERR "%s: Can't get registers address\n",
 255                        np->full_name);
 256                 goto err_free;
 257         }
 258
 259         rc = -ENOMEM;
 260         dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
 261                                                 sizeof(struct zmii_regs));
 262         if (dev->base == NULL) {
 263                 printk(KERN_ERR "%s: Can't map device registers!\n",
 264                        np->full_name);
 265                 goto err_free;
 266         }
 267
 268         /* We may need FER value for autodetection later */
 269         dev->fer_save = in_be32(&dev->base->fer);
 270
 271         /* Disable all inputs by default */
 272         out_be32(&dev->base->fer, 0);
 273
 274         printk(KERN_INFO
 275                "ZMII %s initialized\n", ofdev->node->full_name);
 276         wmb();
 277         dev_set_drvdata(&ofdev->dev, dev);
 278
 279         return 0;
 280
 281  err_free:
 282         kfree(dev);
 283  err_gone:
 284         return rc;
 285 }
 286
 287 static int __devexit zmii_remove(struct of_device *ofdev)
 288 {
 289         struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
 290
 291         dev_set_drvdata(&ofdev->dev, NULL);
 292
 293         WARN_ON(dev->users != 0);
 294
 295         iounmap(dev->base);
 296         kfree(dev);
 297
 298         return 0;
 299 }
 300
 301 static struct of_device_id zmii_match[] =
 302 {
 303         {
 304                 .compatible     = "ibm,zmii",
 305         },
 306         /* For backward compat with old DT */
 307         {
 308                 .type           = "emac-zmii",
 309         },
 310         {},
 311 };
 312
 313 static struct of_platform_driver zmii_driver = {
 314         .name = "emac-zmii",
 315         .match_table = zmii_match,
 316
 317         .probe = zmii_probe,
 318         .remove = zmii_remove,
 319 };
 320
 321 int __init zmii_init(void)
 322 {
 323         return of_register_platform_driver(&zmii_driver);
 324 }
 325
 326 void zmii_exit(void)
 327 {
 328         of_unregister_platform_driver(&zmii_driver);
 329 }