1/* 2 * drivers/net/ibm_newemac/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 <asm/io.h> 22 23#include "emac.h" 24#include "core.h" 25 26int __devinit tah_attach(struct platform_device *ofdev, int channel) 27{ 28 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev); 29 30 mutex_lock(&dev->lock); 31 /* Reset has been done at probe() time... nothing else to do for now */ 32 ++dev->users; 33 mutex_unlock(&dev->lock); 34 35 return 0; 36} 37 38void tah_detach(struct platform_device *ofdev, int channel) 39{ 40 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev); 41 42 mutex_lock(&dev->lock); 43 --dev->users; 44 mutex_unlock(&dev->lock); 45} 46 47void tah_reset(struct platform_device *ofdev) 48{ 49 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev); 50 struct tah_regs __iomem *p = dev->base; 51 int n; 52 53 /* Reset TAH */ 54 out_be32(&p->mr, TAH_MR_SR); 55 n = 100; 56 while ((in_be32(&p->mr) & TAH_MR_SR) && n) 57 --n; 58 59 if (unlikely(!n)) 60 printk(KERN_ERR "%s: reset timeout\n", 61 ofdev->dev.of_node->full_name); 62 63 /* 10KB TAH TX FIFO accomodates the max MTU of 9000 */ 64 out_be32(&p->mr, 65 TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP | 66 TAH_MR_DIG); 67} 68 69int tah_get_regs_len(struct platform_device *ofdev) 70{ 71 return sizeof(struct emac_ethtool_regs_subhdr) + 72 sizeof(struct tah_regs); 73} 74 75void *tah_dump_regs(struct platform_device *ofdev, void *buf) 76{ 77 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev); 78 struct emac_ethtool_regs_subhdr *hdr = buf; 79 struct tah_regs *regs = (struct tah_regs *)(hdr + 1); 80 81 hdr->version = 0; 82 hdr->index = 0; /* for now, are there chips with more than one 83 * zmii ? if yes, then we'll add a cell_index 84 * like we do for emac 85 */ 86 memcpy_fromio(regs, dev->base, sizeof(struct tah_regs)); 87 return regs + 1; 88} 89 90static int __devinit tah_probe(struct platform_device *ofdev, 91 const struct of_device_id *match) 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 printk(KERN_ERR "%s: could not allocate TAH device!\n", 102 np->full_name); 103 goto err_gone; 104 } 105 106 mutex_init(&dev->lock); 107 dev->ofdev = ofdev; 108 109 rc = -ENXIO; 110 if (of_address_to_resource(np, 0, ®s)) { 111 printk(KERN_ERR "%s: Can't get registers address\n", 112 np->full_name); 113 goto err_free; 114 } 115 116 rc = -ENOMEM; 117 dev->base = (struct tah_regs __iomem *)ioremap(regs.start, 118 sizeof(struct tah_regs)); 119 if (dev->base == NULL) { 120 printk(KERN_ERR "%s: Can't map device registers!\n", 121 np->full_name); 122 goto err_free; 123 } 124 125 dev_set_drvdata(&ofdev->dev, dev); 126 127 /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */ 128 tah_reset(ofdev); 129 130 printk(KERN_INFO 131 "TAH %s initialized\n", ofdev->dev.of_node->full_name); 132 wmb(); 133 134 return 0; 135 136 err_free: 137 kfree(dev); 138 err_gone: 139 return rc; 140} 141 142static int __devexit tah_remove(struct platform_device *ofdev) 143{ 144 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev); 145 146 dev_set_drvdata(&ofdev->dev, NULL); 147 148 WARN_ON(dev->users != 0); 149 150 iounmap(dev->base); 151 kfree(dev); 152 153 return 0; 154} 155 156static struct of_device_id tah_match[] = 157{ 158 { 159 .compatible = "ibm,tah", 160 }, 161 /* For backward compat with old DT */ 162 { 163 .type = "tah", 164 }, 165 {}, 166}; 167 168static struct of_platform_driver tah_driver = { 169 .driver = { 170 .name = "emac-tah", 171 .owner = THIS_MODULE, 172 .of_match_table = tah_match, 173 }, 174 .probe = tah_probe, 175 .remove = tah_remove, 176}; 177 178int __init tah_init(void) 179{ 180 return of_register_platform_driver(&tah_driver); 181} 182 183void tah_exit(void) 184{ 185 of_unregister_platform_driver(&tah_driver); 186} 187