drivers/net/ibm_emac/ibm_emac_tah.c

   1 /*
   2  * drivers/net/ibm_emac/ibm_emac_tah.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
   5  *
   6  * Copyright 2004 MontaVista Software, Inc.
   7  * Matt Porter <mporter@kernel.crashing.org>
   8  *
   9  * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  */
  16 #include <asm/io.h>
  17
  18 #include "ibm_emac_core.h"
  19
  20 static int __init tah_init(struct ocp_device *ocpdev)
  21 {
  22         struct tah_regs *p;
  23
  24         if (ocp_get_drvdata(ocpdev)) {
  25                 printk(KERN_ERR "tah%d: already in use!\n", ocpdev->def->index);
  26                 return -EBUSY;
  27         }
  28
  29         /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
  30         p = (struct tah_regs *)ioremap(ocpdev->def->paddr, sizeof(*p));
  31         if (!p) {
  32                 printk(KERN_ERR "tah%d: could not ioremap device registers!\n",
  33                        ocpdev->def->index);
  34                 return -ENOMEM;
  35         }
  36         ocp_set_drvdata(ocpdev, p);
  37         __tah_reset(ocpdev);
  38
  39         return 0;
  40 }
  41
  42 int __init tah_attach(void *emac)
  43 {
  44         struct ocp_enet_private *dev = emac;
  45         struct ocp_func_emac_data *emacdata = dev->def->additions;
  46
  47         /* Check if we need to attach to a TAH */
  48         if (emacdata->tah_idx >= 0) {
  49                 dev->tah_dev = ocp_find_device(OCP_ANY_ID, OCP_FUNC_TAH,
  50                                                emacdata->tah_idx);
  51                 if (!dev->tah_dev) {
  52                         printk(KERN_ERR "emac%d: unknown tah%d!\n",
  53                                dev->def->index, emacdata->tah_idx);
  54                         return -ENODEV;
  55                 }
  56                 if (tah_init(dev->tah_dev)) {
  57                         printk(KERN_ERR
  58                                "emac%d: tah%d initialization failed!\n",
  59                                dev->def->index, emacdata->tah_idx);
  60                         return -ENODEV;
  61                 }
  62         }
  63         return 0;
  64 }
  65
  66 void __tah_fini(struct ocp_device *ocpdev)
  67 {
  68         struct tah_regs *p = ocp_get_drvdata(ocpdev);
  69         BUG_ON(!p);
  70         ocp_set_drvdata(ocpdev, NULL);
  71         iounmap((void *)p);
  72 }
  73
  74 void __tah_reset(struct ocp_device *ocpdev)
  75 {
  76         struct tah_regs *p = ocp_get_drvdata(ocpdev);
  77         int n;
  78
  79         /* Reset TAH */
  80         out_be32(&p->mr, TAH_MR_SR);
  81         n = 100;
  82         while ((in_be32(&p->mr) & TAH_MR_SR) && n)
  83                 --n;
  84
  85         if (unlikely(!n))
  86                 printk(KERN_ERR "tah%d: reset timeout\n", ocpdev->def->index);
  87
  88         /* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
  89         out_be32(&p->mr,
  90                  TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
  91                  TAH_MR_DIG);
  92 }
  93
  94 int __tah_get_regs_len(struct ocp_device *ocpdev)
  95 {
  96         return sizeof(struct emac_ethtool_regs_subhdr) +
  97             sizeof(struct tah_regs);
  98 }
  99
 100 void *tah_dump_regs(struct ocp_device *ocpdev, void *buf)
 101 {
 102         struct tah_regs *dev = ocp_get_drvdata(ocpdev);
 103         struct emac_ethtool_regs_subhdr *hdr = buf;
 104         struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
 105
 106         hdr->version = 0;
 107         hdr->index = ocpdev->def->index;
 108         memcpy_fromio(regs, dev, sizeof(struct tah_regs));
 109         return regs + 1;
 110 }