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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * drivers/net/ethernet/ibm/emac/rgmii.c
   4  *
   5  * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
   6  *
   7  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   8  *                <benh@kernel.crashing.org>
   9  *
  10  * Based on the arch/ppc version of the driver:
  11  *
  12  * Copyright (c) 2004, 2005 Zultys Technologies.
  13  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  14  *
  15  * Based on original work by
  16  *      Matt Porter <mporter@kernel.crashing.org>
  17  *      Copyright 2004 MontaVista Software, Inc.
  18  */
  19 #include <linux/slab.h>
  20 #include <linux/kernel.h>
  21 #include <linux/ethtool.h>
  22 #include <linux/of_address.h>
  23 #include <asm/io.h>
  24
  25 #include "emac.h"
  26 #include "debug.h"
  27
  28 // XXX FIXME: Axon seems to support a subset of the RGMII, we
  29 // thus need to take that into account and possibly change some
  30 // of the bit settings below that don't seem to quite match the
  31 // AXON spec
  32
  33 /* RGMIIx_FER */
  34 #define RGMII_FER_MASK(idx)     (0x7 << ((idx) * 4))
  35 #define RGMII_FER_RTBI(idx)     (0x4 << ((idx) * 4))
  36 #define RGMII_FER_RGMII(idx)    (0x5 << ((idx) * 4))
  37 #define RGMII_FER_TBI(idx)      (0x6 << ((idx) * 4))
  38 #define RGMII_FER_GMII(idx)     (0x7 << ((idx) * 4))
  39 #define RGMII_FER_MII(idx)      RGMII_FER_GMII(idx)
  40
  41 /* RGMIIx_SSR */
  42 #define RGMII_SSR_MASK(idx)     (0x7 << ((idx) * 8))
  43 #define RGMII_SSR_10(idx)       (0x1 << ((idx) * 8))
  44 #define RGMII_SSR_100(idx)      (0x2 << ((idx) * 8))
  45 #define RGMII_SSR_1000(idx)     (0x4 << ((idx) * 8))
  46
  47 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
  48 static inline int rgmii_valid_mode(int phy_mode)
  49 {
  50         return  phy_interface_mode_is_rgmii(phy_mode) ||
  51                 phy_mode == PHY_INTERFACE_MODE_GMII ||
  52                 phy_mode == PHY_INTERFACE_MODE_MII ||
  53                 phy_mode == PHY_INTERFACE_MODE_TBI ||
  54                 phy_mode == PHY_INTERFACE_MODE_RTBI;
  55 }
  56
  57 static inline u32 rgmii_mode_mask(int mode, int input)
  58 {
  59         switch (mode) {
  60         case PHY_INTERFACE_MODE_RGMII:
  61         case PHY_INTERFACE_MODE_RGMII_ID:
  62         case PHY_INTERFACE_MODE_RGMII_RXID:
  63         case PHY_INTERFACE_MODE_RGMII_TXID:
  64                 return RGMII_FER_RGMII(input);
  65         case PHY_INTERFACE_MODE_TBI:
  66                 return RGMII_FER_TBI(input);
  67         case PHY_INTERFACE_MODE_GMII:
  68                 return RGMII_FER_GMII(input);
  69         case PHY_INTERFACE_MODE_MII:
  70                 return RGMII_FER_MII(input);
  71         case PHY_INTERFACE_MODE_RTBI:
  72                 return RGMII_FER_RTBI(input);
  73         default:
  74                 BUG();
  75         }
  76 }
  77
  78 int rgmii_attach(struct platform_device *ofdev, int input, int mode)
  79 {
  80         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
  81         struct rgmii_regs __iomem *p = dev->base;
  82
  83         RGMII_DBG(dev, "attach(%d)" NL, input);
  84
  85         /* Check if we need to attach to a RGMII */
  86         if (input < 0 || !rgmii_valid_mode(mode)) {
  87                 printk(KERN_ERR "%pOF: unsupported settings !\n",
  88                        ofdev->dev.of_node);
  89                 return -ENODEV;
  90         }
  91
  92         mutex_lock(&dev->lock);
  93
  94         /* Enable this input */
  95         out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
  96
  97         printk(KERN_NOTICE "%pOF: input %d in %s mode\n",
  98                ofdev->dev.of_node, input, phy_modes(mode));
  99
 100         ++dev->users;
 101
 102         mutex_unlock(&dev->lock);
 103
 104         return 0;
 105 }
 106
 107 void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
 108 {
 109         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 110         struct rgmii_regs __iomem *p = dev->base;
 111         u32 ssr;
 112
 113         mutex_lock(&dev->lock);
 114
 115         ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
 116
 117         RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
 118
 119         if (speed == SPEED_1000)
 120                 ssr |= RGMII_SSR_1000(input);
 121         else if (speed == SPEED_100)
 122                 ssr |= RGMII_SSR_100(input);
 123         else if (speed == SPEED_10)
 124                 ssr |= RGMII_SSR_10(input);
 125
 126         out_be32(&p->ssr, ssr);
 127
 128         mutex_unlock(&dev->lock);
 129 }
 130
 131 void rgmii_get_mdio(struct platform_device *ofdev, int input)
 132 {
 133         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 134         struct rgmii_regs __iomem *p = dev->base;
 135         u32 fer;
 136
 137         RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
 138
 139         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 140                 return;
 141
 142         mutex_lock(&dev->lock);
 143
 144         fer = in_be32(&p->fer);
 145         fer |= 0x00080000u >> input;
 146         out_be32(&p->fer, fer);
 147         (void)in_be32(&p->fer);
 148
 149         DBG2(dev, " fer = 0x%08x\n", fer);
 150 }
 151
 152 void rgmii_put_mdio(struct platform_device *ofdev, int input)
 153 {
 154         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 155         struct rgmii_regs __iomem *p = dev->base;
 156         u32 fer;
 157
 158         RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
 159
 160         if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
 161                 return;
 162
 163         fer = in_be32(&p->fer);
 164         fer &= ~(0x00080000u >> input);
 165         out_be32(&p->fer, fer);
 166         (void)in_be32(&p->fer);
 167
 168         DBG2(dev, " fer = 0x%08x\n", fer);
 169
 170         mutex_unlock(&dev->lock);
 171 }
 172
 173 void rgmii_detach(struct platform_device *ofdev, int input)
 174 {
 175         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 176         struct rgmii_regs __iomem *p;
 177
 178         BUG_ON(!dev || dev->users == 0);
 179         p = dev->base;
 180
 181         mutex_lock(&dev->lock);
 182
 183         RGMII_DBG(dev, "detach(%d)" NL, input);
 184
 185         /* Disable this input */
 186         out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
 187
 188         --dev->users;
 189
 190         mutex_unlock(&dev->lock);
 191 }
 192
 193 int rgmii_get_regs_len(struct platform_device *ofdev)
 194 {
 195         return sizeof(struct emac_ethtool_regs_subhdr) +
 196                 sizeof(struct rgmii_regs);
 197 }
 198
 199 void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
 200 {
 201         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 202         struct emac_ethtool_regs_subhdr *hdr = buf;
 203         struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
 204
 205         hdr->version = 0;
 206         hdr->index = 0; /* for now, are there chips with more than one
 207                          * rgmii ? if yes, then we'll add a cell_index
 208                          * like we do for emac
 209                          */
 210         memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
 211         return regs + 1;
 212 }
 213
 214
 215 static int rgmii_probe(struct platform_device *ofdev)
 216 {
 217         struct device_node *np = ofdev->dev.of_node;
 218         struct rgmii_instance *dev;
 219         struct resource regs;
 220         int rc;
 221
 222         rc = -ENOMEM;
 223         dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
 224         if (dev == NULL)
 225                 goto err_gone;
 226
 227         mutex_init(&dev->lock);
 228         dev->ofdev = ofdev;
 229
 230         rc = -ENXIO;
 231         if (of_address_to_resource(np, 0, &regs)) {
 232                 printk(KERN_ERR "%pOF: Can't get registers address\n", np);
 233                 goto err_free;
 234         }
 235
 236         rc = -ENOMEM;
 237         dev->base = (struct rgmii_regs __iomem *)ioremap(regs.start,
 238                                                  sizeof(struct rgmii_regs));
 239         if (dev->base == NULL) {
 240                 printk(KERN_ERR "%pOF: Can't map device registers!\n", np);
 241                 goto err_free;
 242         }
 243
 244         /* Check for RGMII flags */
 245         if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
 246                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
 247
 248         /* CAB lacks the right properties, fix this up */
 249         if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
 250                 dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;
 251
 252         DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
 253              in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
 254
 255         /* Disable all inputs by default */
 256         out_be32(&dev->base->fer, 0);
 257
 258         printk(KERN_INFO
 259                "RGMII %pOF initialized with%s MDIO support\n",
 260                ofdev->dev.of_node,
 261                (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");
 262
 263         wmb();
 264         platform_set_drvdata(ofdev, dev);
 265
 266         return 0;
 267
 268  err_free:
 269         kfree(dev);
 270  err_gone:
 271         return rc;
 272 }
 273
 274 static int rgmii_remove(struct platform_device *ofdev)
 275 {
 276         struct rgmii_instance *dev = platform_get_drvdata(ofdev);
 277
 278         WARN_ON(dev->users != 0);
 279
 280         iounmap(dev->base);
 281         kfree(dev);
 282
 283         return 0;
 284 }
 285
 286 static const struct of_device_id rgmii_match[] =
 287 {
 288         {
 289                 .compatible     = "ibm,rgmii",
 290         },
 291         {
 292                 .type           = "emac-rgmii",
 293         },
 294         {},
 295 };
 296
 297 static struct platform_driver rgmii_driver = {
 298         .driver = {
 299                 .name = "emac-rgmii",
 300                 .of_match_table = rgmii_match,
 301         },
 302         .probe = rgmii_probe,
 303         .remove = rgmii_remove,
 304 };
 305
 306 int __init rgmii_init(void)
 307 {
 308         return platform_driver_register(&rgmii_driver);
 309 }
 310
 311 void rgmii_exit(void)
 312 {
 313         platform_driver_unregister(&rgmii_driver);
 314 }