drivers/net/ibm_emac/ibm_emac_rgmii.c

   1 /*
   2  * drivers/net/ibm_emac/ibm_emac_rgmii.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller, RGMII 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  *      Matt Porter <mporter@kernel.crashing.org>
  11  *      Copyright 2004 MontaVista Software, 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 /* RGMIIx_FER */
  27 #define RGMII_FER_MASK(idx)     (0x7 << ((idx) * 4))
  28 #define RGMII_FER_RTBI(idx)     (0x4 << ((idx) * 4))
  29 #define RGMII_FER_RGMII(idx)    (0x5 << ((idx) * 4))
  30 #define RGMII_FER_TBI(idx)      (0x6 << ((idx) * 4))
  31 #define RGMII_FER_GMII(idx)     (0x7 << ((idx) * 4))
  32
  33 /* RGMIIx_SSR */
  34 #define RGMII_SSR_MASK(idx)     (0x7 << ((idx) * 8))
  35 #define RGMII_SSR_100(idx)      (0x2 << ((idx) * 8))
  36 #define RGMII_SSR_1000(idx)     (0x4 << ((idx) * 8))
  37
  38 /* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
  39 static inline int rgmii_valid_mode(int phy_mode)
  40 {
  41         return  phy_mode == PHY_MODE_GMII ||
  42                 phy_mode == PHY_MODE_RGMII ||
  43                 phy_mode == PHY_MODE_TBI ||
  44                 phy_mode == PHY_MODE_RTBI;
  45 }
  46
  47 static inline const char *rgmii_mode_name(int mode)
  48 {
  49         switch (mode) {
  50         case PHY_MODE_RGMII:
  51                 return "RGMII";
  52         case PHY_MODE_TBI:
  53                 return "TBI";
  54         case PHY_MODE_GMII:
  55                 return "GMII";
  56         case PHY_MODE_RTBI:
  57                 return "RTBI";
  58         default:
  59                 BUG();
  60         }
  61 }
  62
  63 static inline u32 rgmii_mode_mask(int mode, int input)
  64 {
  65         switch (mode) {
  66         case PHY_MODE_RGMII:
  67                 return RGMII_FER_RGMII(input);
  68         case PHY_MODE_TBI:
  69                 return RGMII_FER_TBI(input);
  70         case PHY_MODE_GMII:
  71                 return RGMII_FER_GMII(input);
  72         case PHY_MODE_RTBI:
  73                 return RGMII_FER_RTBI(input);
  74         default:
  75                 BUG();
  76         }
  77 }
  78
  79 static int __init rgmii_init(struct ocp_device *ocpdev, int input, int mode)
  80 {
  81         struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
  82         struct rgmii_regs *p;
  83
  84         RGMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, mode);
  85
  86         if (!dev) {
  87                 dev = kzalloc(sizeof(struct ibm_ocp_rgmii), GFP_KERNEL);
  88                 if (!dev) {
  89                         printk(KERN_ERR
  90                                "rgmii%d: couldn't allocate device structure!\n",
  91                                ocpdev->def->index);
  92                         return -ENOMEM;
  93                 }
  94
  95                 p = (struct rgmii_regs *)ioremap(ocpdev->def->paddr,
  96                                                  sizeof(struct rgmii_regs));
  97                 if (!p) {
  98                         printk(KERN_ERR
  99                                "rgmii%d: could not ioremap device registers!\n",
 100                                ocpdev->def->index);
 101                         kfree(dev);
 102                         return -ENOMEM;
 103                 }
 104
 105                 dev->base = p;
 106                 ocp_set_drvdata(ocpdev, dev);
 107
 108                 /* Disable all inputs by default */
 109                 out_be32(&p->fer, 0);
 110         } else
 111                 p = dev->base;
 112
 113         /* Enable this input */
 114         out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
 115
 116         printk(KERN_NOTICE "rgmii%d: input %d in %s mode\n",
 117                ocpdev->def->index, input, rgmii_mode_name(mode));
 118
 119         ++dev->users;
 120         return 0;
 121 }
 122
 123 int __init rgmii_attach(void *emac)
 124 {
 125         struct ocp_enet_private *dev = emac;
 126         struct ocp_func_emac_data *emacdata = dev->def->additions;
 127
 128         /* Check if we need to attach to a RGMII */
 129         if (emacdata->rgmii_idx >= 0 && rgmii_valid_mode(emacdata->phy_mode)) {
 130                 dev->rgmii_input = emacdata->rgmii_mux;
 131                 dev->rgmii_dev =
 132                     ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_RGMII,
 133                                     emacdata->rgmii_idx);
 134                 if (!dev->rgmii_dev) {
 135                         printk(KERN_ERR "emac%d: unknown rgmii%d!\n",
 136                                dev->def->index, emacdata->rgmii_idx);
 137                         return -ENODEV;
 138                 }
 139                 if (rgmii_init
 140                     (dev->rgmii_dev, dev->rgmii_input, emacdata->phy_mode)) {
 141                         printk(KERN_ERR
 142                                "emac%d: rgmii%d initialization failed!\n",
 143                                dev->def->index, emacdata->rgmii_idx);
 144                         return -ENODEV;
 145                 }
 146         }
 147         return 0;
 148 }
 149
 150 void rgmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
 151 {
 152         struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
 153         u32 ssr = in_be32(&dev->base->ssr) & ~RGMII_SSR_MASK(input);
 154
 155         RGMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
 156
 157         if (speed == SPEED_1000)
 158                 ssr |= RGMII_SSR_1000(input);
 159         else if (speed == SPEED_100)
 160                 ssr |= RGMII_SSR_100(input);
 161
 162         out_be32(&dev->base->ssr, ssr);
 163 }
 164
 165 void __exit __rgmii_fini(struct ocp_device *ocpdev, int input)
 166 {
 167         struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
 168         BUG_ON(!dev || dev->users == 0);
 169
 170         RGMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
 171
 172         /* Disable this input */
 173         out_be32(&dev->base->fer,
 174                  in_be32(&dev->base->fer) & ~RGMII_FER_MASK(input));
 175
 176         if (!--dev->users) {
 177                 /* Free everything if this is the last user */
 178                 ocp_set_drvdata(ocpdev, NULL);
 179                 iounmap((void *)dev->base);
 180                 kfree(dev);
 181         }
 182 }
 183
 184 int __rgmii_get_regs_len(struct ocp_device *ocpdev)
 185 {
 186         return sizeof(struct emac_ethtool_regs_subhdr) +
 187             sizeof(struct rgmii_regs);
 188 }
 189
 190 void *rgmii_dump_regs(struct ocp_device *ocpdev, void *buf)
 191 {
 192         struct ibm_ocp_rgmii *dev = ocp_get_drvdata(ocpdev);
 193         struct emac_ethtool_regs_subhdr *hdr = buf;
 194         struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
 195
 196         hdr->version = 0;
 197         hdr->index = ocpdev->def->index;
 198         memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
 199         return regs + 1;
 200 }