drivers/net/ibm_emac/ibm_emac_zmii.c

   1 /*
   2  * drivers/net/ibm_emac/ibm_emac_zmii.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
   5  *
   6  * Copyright (c) 2004, 2005 Zultys Technologies.
   7  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
   8  *
   9  * Based on original work by
  10  *      Armin Kuster <akuster@mvista.com>
  11  *      Copyright 2001 MontaVista Softare Inc.
  12  *
  13  * This program is free software; you can redistribute  it and/or modify it
  14  * under  the terms of  the GNU General  Public License as published by the
  15  * Free Software Foundation;  either version 2 of the  License, or (at your
  16  * option) any later version.
  17  *
  18  */
  19 #include <linux/kernel.h>
  20 #include <linux/ethtool.h>
  21 #include <asm/io.h>
  22
  23 #include "ibm_emac_core.h"
  24 #include "ibm_emac_debug.h"
  25
  26 /* ZMIIx_FER */
  27 #define ZMII_FER_MDI(idx)       (0x80000000 >> ((idx) * 4))
  28 #define ZMII_FER_MDI_ALL        (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
  29                                  ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
  30
  31 #define ZMII_FER_SMII(idx)      (0x40000000 >> ((idx) * 4))
  32 #define ZMII_FER_RMII(idx)      (0x20000000 >> ((idx) * 4))
  33 #define ZMII_FER_MII(idx)       (0x10000000 >> ((idx) * 4))
  34
  35 /* ZMIIx_SSR */
  36 #define ZMII_SSR_SCI(idx)       (0x40000000 >> ((idx) * 4))
  37 #define ZMII_SSR_FSS(idx)       (0x20000000 >> ((idx) * 4))
  38 #define ZMII_SSR_SP(idx)        (0x10000000 >> ((idx) * 4))
  39
  40 /* ZMII only supports MII, RMII and SMII
  41  * we also support autodetection for backward compatibility
  42  */
  43 static inline int zmii_valid_mode(int mode)
  44 {
  45         return  mode == PHY_MODE_MII ||
  46                 mode == PHY_MODE_RMII ||
  47                 mode == PHY_MODE_SMII ||
  48                 mode == PHY_MODE_NA;
  49 }
  50
  51 static inline const char *zmii_mode_name(int mode)
  52 {
  53         switch (mode) {
  54         case PHY_MODE_MII:
  55                 return "MII";
  56         case PHY_MODE_RMII:
  57                 return "RMII";
  58         case PHY_MODE_SMII:
  59                 return "SMII";
  60         default:
  61                 BUG();
  62         }
  63 }
  64
  65 static inline u32 zmii_mode_mask(int mode, int input)
  66 {
  67         switch (mode) {
  68         case PHY_MODE_MII:
  69                 return ZMII_FER_MII(input);
  70         case PHY_MODE_RMII:
  71                 return ZMII_FER_RMII(input);
  72         case PHY_MODE_SMII:
  73                 return ZMII_FER_SMII(input);
  74         default:
  75                 return 0;
  76         }
  77 }
  78
  79 static int __init zmii_init(struct ocp_device *ocpdev, int input, int *mode)
  80 {
  81         struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
  82         struct zmii_regs __iomem *p;
  83
  84         ZMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, *mode);
  85
  86         if (!dev) {
  87                 dev = kzalloc(sizeof(struct ibm_ocp_zmii), GFP_KERNEL);
  88                 if (!dev) {
  89                         printk(KERN_ERR
  90                                "zmii%d: couldn't allocate device structure!\n",
  91                                ocpdev->def->index);
  92                         return -ENOMEM;
  93                 }
  94                 dev->mode = PHY_MODE_NA;
  95
  96                 p = ioremap(ocpdev->def->paddr, sizeof(struct zmii_regs));
  97                 if (!p) {
  98                         printk(KERN_ERR
  99                                "zmii%d: could not ioremap device registers!\n",
 100                                ocpdev->def->index);
 101                         kfree(dev);
 102                         return -ENOMEM;
 103                 }
 104                 dev->base = p;
 105                 ocp_set_drvdata(ocpdev, dev);
 106
 107                 /* We may need FER value for autodetection later */
 108                 dev->fer_save = in_be32(&p->fer);
 109
 110                 /* Disable all inputs by default */
 111                 out_be32(&p->fer, 0);
 112         } else
 113                 p = dev->base;
 114
 115         if (!zmii_valid_mode(*mode)) {
 116                 /* Probably an EMAC connected to RGMII,
 117                  * but it still may need ZMII for MDIO
 118                  */
 119                 goto out;
 120         }
 121
 122         /* Autodetect ZMII mode if not specified.
 123          * This is only for backward compatibility with the old driver.
 124          * Please, always specify PHY mode in your board port to avoid
 125          * any surprises.
 126          */
 127         if (dev->mode == PHY_MODE_NA) {
 128                 if (*mode == PHY_MODE_NA) {
 129                         u32 r = dev->fer_save;
 130
 131                         ZMII_DBG("%d: autodetecting mode, FER = 0x%08x" NL,
 132                                  ocpdev->def->index, r);
 133
 134                         if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
 135                                 dev->mode = PHY_MODE_MII;
 136                         else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
 137                                 dev->mode = PHY_MODE_RMII;
 138                         else
 139                                 dev->mode = PHY_MODE_SMII;
 140                 } else
 141                         dev->mode = *mode;
 142
 143                 printk(KERN_NOTICE "zmii%d: bridge in %s mode\n",
 144                        ocpdev->def->index, zmii_mode_name(dev->mode));
 145         } else {
 146                 /* All inputs must use the same mode */
 147                 if (*mode != PHY_MODE_NA && *mode != dev->mode) {
 148                         printk(KERN_ERR
 149                                "zmii%d: invalid mode %d specified for input %d\n",
 150                                ocpdev->def->index, *mode, input);
 151                         return -EINVAL;
 152                 }
 153         }
 154
 155         /* Report back correct PHY mode,
 156          * it may be used during PHY initialization.
 157          */
 158         *mode = dev->mode;
 159
 160         /* Enable this input */
 161         out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
 162       out:
 163         ++dev->users;
 164         return 0;
 165 }
 166
 167 int __init zmii_attach(void *emac)
 168 {
 169         struct ocp_enet_private *dev = emac;
 170         struct ocp_func_emac_data *emacdata = dev->def->additions;
 171
 172         if (emacdata->zmii_idx >= 0) {
 173                 dev->zmii_input = emacdata->zmii_mux;
 174                 dev->zmii_dev =
 175                     ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_ZMII,
 176                                     emacdata->zmii_idx);
 177                 if (!dev->zmii_dev) {
 178                         printk(KERN_ERR "emac%d: unknown zmii%d!\n",
 179                                dev->def->index, emacdata->zmii_idx);
 180                         return -ENODEV;
 181                 }
 182                 if (zmii_init
 183                     (dev->zmii_dev, dev->zmii_input, &emacdata->phy_mode)) {
 184                         printk(KERN_ERR
 185                                "emac%d: zmii%d initialization failed!\n",
 186                                dev->def->index, emacdata->zmii_idx);
 187                         return -ENODEV;
 188                 }
 189         }
 190         return 0;
 191 }
 192
 193 void __zmii_enable_mdio(struct ocp_device *ocpdev, int input)
 194 {
 195         struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
 196         u32 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
 197
 198         ZMII_DBG2("%d: mdio(%d)" NL, ocpdev->def->index, input);
 199
 200         out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
 201 }
 202
 203 void __zmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
 204 {
 205         struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
 206         u32 ssr = in_be32(&dev->base->ssr);
 207
 208         ZMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
 209
 210         if (speed == SPEED_100)
 211                 ssr |= ZMII_SSR_SP(input);
 212         else
 213                 ssr &= ~ZMII_SSR_SP(input);
 214
 215         out_be32(&dev->base->ssr, ssr);
 216 }
 217
 218 void __zmii_fini(struct ocp_device *ocpdev, int input)
 219 {
 220         struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
 221         BUG_ON(!dev || dev->users == 0);
 222
 223         ZMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
 224
 225         /* Disable this input */
 226         out_be32(&dev->base->fer,
 227                  in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
 228
 229         if (!--dev->users) {
 230                 /* Free everything if this is the last user */
 231                 ocp_set_drvdata(ocpdev, NULL);
 232                 iounmap(dev->base);
 233                 kfree(dev);
 234         }
 235 }
 236
 237 int __zmii_get_regs_len(struct ocp_device *ocpdev)
 238 {
 239         return sizeof(struct emac_ethtool_regs_subhdr) +
 240             sizeof(struct zmii_regs);
 241 }
 242
 243 void *zmii_dump_regs(struct ocp_device *ocpdev, void *buf)
 244 {
 245         struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
 246         struct emac_ethtool_regs_subhdr *hdr = buf;
 247         struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
 248
 249         hdr->version = 0;
 250         hdr->index = ocpdev->def->index;
 251         memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
 252         return regs + 1;
 253 }