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 26 int __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 38 void 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 47 void 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 accommodates 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 69 int tah_get_regs_len(struct platform_device *ofdev) 70 { 71 return sizeof(struct emac_ethtool_regs_subhdr) + 72 sizeof(struct tah_regs); 73 } 74 75 void *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 90 static int __devinit tah_probe(struct platform_device *ofdev) 91 { 92 struct device_node *np = ofdev->dev.of_node; 93 struct tah_instance *dev; 94 struct resource regs; 95 int rc; 96 97 rc = -ENOMEM; 98 dev = kzalloc(sizeof(struct tah_instance), GFP_KERNEL); 99 if (dev == NULL) { 100 printk(KERN_ERR "%s: could not allocate TAH device!\n", 101 np->full_name); 102 goto err_gone; 103 } 104 105 mutex_init(&dev->lock); 106 dev->ofdev = ofdev; 107 108 rc = -ENXIO; 109 if (of_address_to_resource(np, 0, ®s)) { 110 printk(KERN_ERR "%s: Can't get registers address\n", 111 np->full_name); 112 goto err_free; 113 } 114 115 rc = -ENOMEM; 116 dev->base = (struct tah_regs __iomem *)ioremap(regs.start, 117 sizeof(struct tah_regs)); 118 if (dev->base == NULL) { 119 printk(KERN_ERR "%s: Can't map device registers!\n", 120 np->full_name); 121 goto err_free; 122 } 123 124 dev_set_drvdata(&ofdev->dev, dev); 125 126 /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */ 127 tah_reset(ofdev); 128 129 printk(KERN_INFO 130 "TAH %s initialized\n", ofdev->dev.of_node->full_name); 131 wmb(); 132 133 return 0; 134 135 err_free: 136 kfree(dev); 137 err_gone: 138 return rc; 139 } 140 141 static int __devexit tah_remove(struct platform_device *ofdev) 142 { 143 struct tah_instance *dev = dev_get_drvdata(&ofdev->dev); 144 145 dev_set_drvdata(&ofdev->dev, NULL); 146 147 WARN_ON(dev->users != 0); 148 149 iounmap(dev->base); 150 kfree(dev); 151 152 return 0; 153 } 154 155 static struct of_device_id tah_match[] = 156 { 157 { 158 .compatible = "ibm,tah", 159 }, 160 /* For backward compat with old DT */ 161 { 162 .type = "tah", 163 }, 164 {}, 165 }; 166 167 static struct platform_driver tah_driver = { 168 .driver = { 169 .name = "emac-tah", 170 .owner = THIS_MODULE, 171 .of_match_table = tah_match, 172 }, 173 .probe = tah_probe, 174 .remove = tah_remove, 175 }; 176 177 int __init tah_init(void) 178 { 179 return platform_driver_register(&tah_driver); 180 } 181 182 void tah_exit(void) 183 { 184 platform_driver_unregister(&tah_driver); 185 } 186