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Linux/drivers/net/ethernet/ibm/emac/tah.c

  1 /*
  2  * drivers/net/ethernet/ibm/emac/tah.c
  3  *
  4  * Driver for PowerPC 4xx on-chip ethernet controller, TAH 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 2004 MontaVista Software, Inc.
 12  * Matt Porter <mporter@kernel.crashing.org>
 13  *
 14  * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
 15  *
 16  * This program is free software; you can redistribute  it and/or modify it
 17  * under  the terms of  the GNU General  Public License as published by the
 18  * Free Software Foundation;  either version 2 of the  License, or (at your
 19  * option) any later version.
 20  */
 21 #include <linux/of_address.h>
 22 #include <asm/io.h>
 23 
 24 #include "emac.h"
 25 #include "core.h"
 26 
 27 int tah_attach(struct platform_device *ofdev, int channel)
 28 {
 29         struct tah_instance *dev = platform_get_drvdata(ofdev);
 30 
 31         mutex_lock(&dev->lock);
 32         /* Reset has been done at probe() time... nothing else to do for now */
 33         ++dev->users;
 34         mutex_unlock(&dev->lock);
 35 
 36         return 0;
 37 }
 38 
 39 void tah_detach(struct platform_device *ofdev, int channel)
 40 {
 41         struct tah_instance *dev = platform_get_drvdata(ofdev);
 42 
 43         mutex_lock(&dev->lock);
 44         --dev->users;
 45         mutex_unlock(&dev->lock);
 46 }
 47 
 48 void tah_reset(struct platform_device *ofdev)
 49 {
 50         struct tah_instance *dev = platform_get_drvdata(ofdev);
 51         struct tah_regs __iomem *p = dev->base;
 52         int n;
 53 
 54         /* Reset TAH */
 55         out_be32(&p->mr, TAH_MR_SR);
 56         n = 100;
 57         while ((in_be32(&p->mr) & TAH_MR_SR) && n)
 58                 --n;
 59 
 60         if (unlikely(!n))
 61                 printk(KERN_ERR "%s: reset timeout\n",
 62                         ofdev->dev.of_node->full_name);
 63 
 64         /* 10KB TAH TX FIFO accommodates the max MTU of 9000 */
 65         out_be32(&p->mr,
 66                  TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
 67                  TAH_MR_DIG);
 68 }
 69 
 70 int tah_get_regs_len(struct platform_device *ofdev)
 71 {
 72         return sizeof(struct emac_ethtool_regs_subhdr) +
 73                 sizeof(struct tah_regs);
 74 }
 75 
 76 void *tah_dump_regs(struct platform_device *ofdev, void *buf)
 77 {
 78         struct tah_instance *dev = platform_get_drvdata(ofdev);
 79         struct emac_ethtool_regs_subhdr *hdr = buf;
 80         struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
 81 
 82         hdr->version = 0;
 83         hdr->index = 0; /* for now, are there chips with more than one
 84                          * zmii ? if yes, then we'll add a cell_index
 85                          * like we do for emac
 86                          */
 87         memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
 88         return regs + 1;
 89 }
 90 
 91 static int tah_probe(struct platform_device *ofdev)
 92 {
 93         struct device_node *np = ofdev->dev.of_node;
 94         struct tah_instance *dev;
 95         struct resource regs;
 96         int rc;
 97 
 98         rc = -ENOMEM;
 99         dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL);
100         if (dev == NULL)
101                 goto err_gone;
102 
103         mutex_init(&dev->lock);
104         dev->ofdev = ofdev;
105 
106         rc = -ENXIO;
107         if (of_address_to_resource(np, 0, &regs)) {
108                 printk(KERN_ERR "%s: Can't get registers address\n",
109                        np->full_name);
110                 goto err_free;
111         }
112 
113         rc = -ENOMEM;
114         dev->base = (struct tah_regs __iomem *)ioremap(regs.start,
115                                                sizeof(struct tah_regs));
116         if (dev->base == NULL) {
117                 printk(KERN_ERR "%s: Can't map device registers!\n",
118                        np->full_name);
119                 goto err_free;
120         }
121 
122         platform_set_drvdata(ofdev, dev);
123 
124         /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
125         tah_reset(ofdev);
126 
127         printk(KERN_INFO
128                "TAH %s initialized\n", ofdev->dev.of_node->full_name);
129         wmb();
130 
131         return 0;
132 
133  err_free:
134         kfree(dev);
135  err_gone:
136         return rc;
137 }
138 
139 static int tah_remove(struct platform_device *ofdev)
140 {
141         struct tah_instance *dev = platform_get_drvdata(ofdev);
142 
143         WARN_ON(dev->users != 0);
144 
145         iounmap(dev->base);
146         kfree(dev);
147 
148         return 0;
149 }
150 
151 static struct of_device_id tah_match[] =
152 {
153         {
154                 .compatible     = "ibm,tah",
155         },
156         /* For backward compat with old DT */
157         {
158                 .type           = "tah",
159         },
160         {},
161 };
162 
163 static struct platform_driver tah_driver = {
164         .driver = {
165                 .name = "emac-tah",
166                 .owner = THIS_MODULE,
167                 .of_match_table = tah_match,
168         },
169         .probe = tah_probe,
170         .remove = tah_remove,
171 };
172 
173 int __init tah_init(void)
174 {
175         return platform_driver_register(&tah_driver);
176 }
177 
178 void tah_exit(void)
179 {
180         platform_driver_unregister(&tah_driver);
181 }
182 

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