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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/net/ethernet/ibm/emac/tah.c
4 *
5 * Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
6 *
7 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
8 * <benh@kernel.crashing.org>
9 *
10 * Based on the arch/ppc version of the driver:
11 *
12 * Copyright 2004 MontaVista Software, Inc.
13 * Matt Porter <mporter@kernel.crashing.org>
14 *
15 * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
16 */
17#include <linux/mod_devicetable.h>
18#include <linux/of_address.h>
19#include <linux/platform_device.h>
20#include <asm/io.h>
21
22#include "emac.h"
23#include "core.h"
24
25int tah_attach(struct platform_device *ofdev, int channel)
26{
27 struct tah_instance *dev = platform_get_drvdata(ofdev);
28
29 mutex_lock(&dev->lock);
30 /* Reset has been done at probe() time... nothing else to do for now */
31 ++dev->users;
32 mutex_unlock(&dev->lock);
33
34 return 0;
35}
36
37void tah_detach(struct platform_device *ofdev, int channel)
38{
39 struct tah_instance *dev = platform_get_drvdata(ofdev);
40
41 mutex_lock(&dev->lock);
42 --dev->users;
43 mutex_unlock(&dev->lock);
44}
45
46void tah_reset(struct platform_device *ofdev)
47{
48 struct tah_instance *dev = platform_get_drvdata(ofdev);
49 struct tah_regs __iomem *p = dev->base;
50 int n;
51
52 /* Reset TAH */
53 out_be32(&p->mr, TAH_MR_SR);
54 n = 100;
55 while ((in_be32(&p->mr) & TAH_MR_SR) && n)
56 --n;
57
58 if (unlikely(!n))
59 printk(KERN_ERR "%pOF: reset timeout\n", ofdev->dev.of_node);
60
61 /* 10KB TAH TX FIFO accommodates the max MTU of 9000 */
62 out_be32(&p->mr,
63 TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
64 TAH_MR_DIG);
65}
66
67int tah_get_regs_len(struct platform_device *ofdev)
68{
69 return sizeof(struct emac_ethtool_regs_subhdr) +
70 sizeof(struct tah_regs);
71}
72
73void *tah_dump_regs(struct platform_device *ofdev, void *buf)
74{
75 struct tah_instance *dev = platform_get_drvdata(ofdev);
76 struct emac_ethtool_regs_subhdr *hdr = buf;
77 struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
78
79 hdr->version = 0;
80 hdr->index = 0; /* for now, are there chips with more than one
81 * zmii ? if yes, then we'll add a cell_index
82 * like we do for emac
83 */
84 memcpy_fromio(regs, dev->base, sizeof(struct tah_regs));
85 return regs + 1;
86}
87
88static int tah_probe(struct platform_device *ofdev)
89{
90 struct tah_instance *dev;
91 int err;
92
93 dev = devm_kzalloc(&ofdev->dev, sizeof(struct tah_instance),
94 GFP_KERNEL);
95 if (!dev)
96 return -ENOMEM;
97
98 err = devm_mutex_init(&ofdev->dev, &dev->lock);
99 if (err)
100 return err;
101
102 dev->ofdev = ofdev;
103
104 dev->base = devm_platform_ioremap_resource(ofdev, 0);
105 if (IS_ERR(dev->base)) {
106 dev_err(&ofdev->dev, "can't map device registers");
107 return PTR_ERR(dev->base);
108 }
109
110 platform_set_drvdata(ofdev, dev);
111
112 /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
113 tah_reset(ofdev);
114
115 printk(KERN_INFO "TAH %pOF initialized\n", ofdev->dev.of_node);
116 wmb();
117
118 return 0;
119}
120
121static const struct of_device_id tah_match[] =
122{
123 {
124 .compatible = "ibm,tah",
125 },
126 /* For backward compat with old DT */
127 {
128 .type = "tah",
129 },
130 {},
131};
132
133static struct platform_driver tah_driver = {
134 .driver = {
135 .name = "emac-tah",
136 .of_match_table = tah_match,
137 },
138 .probe = tah_probe,
139};
140
141int __init tah_init(void)
142{
143 return platform_driver_register(&tah_driver);
144}
145
146void tah_exit(void)
147{
148 platform_driver_unregister(&tah_driver);
149}
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
27int 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
39void 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
48void 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
70int tah_get_regs_len(struct platform_device *ofdev)
71{
72 return sizeof(struct emac_ethtool_regs_subhdr) +
73 sizeof(struct tah_regs);
74}
75
76void *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
91static 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, ®s)) {
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
139static 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
151static 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
163static 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
173int __init tah_init(void)
174{
175 return platform_driver_register(&tah_driver);
176}
177
178void tah_exit(void)
179{
180 platform_driver_unregister(&tah_driver);
181}