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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * tscan1.c: driver for Technologic Systems TS-CAN1 PC104 boards
4 *
5 * Copyright 2010 Andre B. Oliveira
6 */
7
8/* References:
9 * - Getting started with TS-CAN1, Technologic Systems, Feb 2022
10 * https://docs.embeddedts.com/TS-CAN1
11 */
12
13#include <linux/init.h>
14#include <linux/io.h>
15#include <linux/ioport.h>
16#include <linux/isa.h>
17#include <linux/module.h>
18#include <linux/netdevice.h>
19#include "sja1000.h"
20
21MODULE_DESCRIPTION("Driver for Technologic Systems TS-CAN1 PC104 boards");
22MODULE_AUTHOR("Andre B. Oliveira <anbadeol@gmail.com>");
23MODULE_LICENSE("GPL");
24
25/* Maximum number of boards (one in each JP1:JP2 setting of IO address) */
26#define TSCAN1_MAXDEV 4
27
28/* PLD registers address offsets */
29#define TSCAN1_ID1 0
30#define TSCAN1_ID2 1
31#define TSCAN1_VERSION 2
32#define TSCAN1_LED 3
33#define TSCAN1_PAGE 4
34#define TSCAN1_MODE 5
35#define TSCAN1_JUMPERS 6
36
37/* PLD board identifier registers magic values */
38#define TSCAN1_ID1_VALUE 0xf6
39#define TSCAN1_ID2_VALUE 0xb9
40
41/* PLD mode register SJA1000 IO enable bit */
42#define TSCAN1_MODE_ENABLE 0x40
43
44/* PLD jumpers register bits */
45#define TSCAN1_JP4 0x10
46#define TSCAN1_JP5 0x20
47
48/* PLD IO base addresses start */
49#define TSCAN1_PLD_ADDRESS 0x150
50
51/* PLD register space size */
52#define TSCAN1_PLD_SIZE 8
53
54/* SJA1000 register space size */
55#define TSCAN1_SJA1000_SIZE 32
56
57/* SJA1000 crystal frequency (16MHz) */
58#define TSCAN1_SJA1000_XTAL 16000000
59
60/* SJA1000 IO base addresses */
61static const unsigned short tscan1_sja1000_addresses[] = {
62 0x100, 0x120, 0x180, 0x1a0, 0x200, 0x240, 0x280, 0x320
63};
64
65/* Read SJA1000 register */
66static u8 tscan1_read(const struct sja1000_priv *priv, int reg)
67{
68 return inb((unsigned long)priv->reg_base + reg);
69}
70
71/* Write SJA1000 register */
72static void tscan1_write(const struct sja1000_priv *priv, int reg, u8 val)
73{
74 outb(val, (unsigned long)priv->reg_base + reg);
75}
76
77/* Probe for a TS-CAN1 board with JP2:JP1 jumper setting ID */
78static int tscan1_probe(struct device *dev, unsigned id)
79{
80 struct net_device *netdev;
81 struct sja1000_priv *priv;
82 unsigned long pld_base, sja1000_base;
83 int irq, i;
84
85 pld_base = TSCAN1_PLD_ADDRESS + id * TSCAN1_PLD_SIZE;
86 if (!request_region(pld_base, TSCAN1_PLD_SIZE, dev_name(dev)))
87 return -EBUSY;
88
89 if (inb(pld_base + TSCAN1_ID1) != TSCAN1_ID1_VALUE ||
90 inb(pld_base + TSCAN1_ID2) != TSCAN1_ID2_VALUE) {
91 release_region(pld_base, TSCAN1_PLD_SIZE);
92 return -ENODEV;
93 }
94
95 switch (inb(pld_base + TSCAN1_JUMPERS) & (TSCAN1_JP4 | TSCAN1_JP5)) {
96 case TSCAN1_JP4:
97 irq = 6;
98 break;
99 case TSCAN1_JP5:
100 irq = 7;
101 break;
102 case TSCAN1_JP4 | TSCAN1_JP5:
103 irq = 5;
104 break;
105 default:
106 dev_err(dev, "invalid JP4:JP5 setting (no IRQ)\n");
107 release_region(pld_base, TSCAN1_PLD_SIZE);
108 return -EINVAL;
109 }
110
111 netdev = alloc_sja1000dev(0);
112 if (!netdev) {
113 release_region(pld_base, TSCAN1_PLD_SIZE);
114 return -ENOMEM;
115 }
116
117 dev_set_drvdata(dev, netdev);
118 SET_NETDEV_DEV(netdev, dev);
119
120 netdev->base_addr = pld_base;
121 netdev->irq = irq;
122
123 priv = netdev_priv(netdev);
124 priv->read_reg = tscan1_read;
125 priv->write_reg = tscan1_write;
126 priv->can.clock.freq = TSCAN1_SJA1000_XTAL / 2;
127 priv->cdr = CDR_CBP | CDR_CLK_OFF;
128 priv->ocr = OCR_TX0_PUSHPULL;
129
130 /* Select the first SJA1000 IO address that is free and that works */
131 for (i = 0; i < ARRAY_SIZE(tscan1_sja1000_addresses); i++) {
132 sja1000_base = tscan1_sja1000_addresses[i];
133 if (!request_region(sja1000_base, TSCAN1_SJA1000_SIZE,
134 dev_name(dev)))
135 continue;
136
137 /* Set SJA1000 IO base address and enable it */
138 outb(TSCAN1_MODE_ENABLE | i, pld_base + TSCAN1_MODE);
139
140 priv->reg_base = (void __iomem *)sja1000_base;
141 if (!register_sja1000dev(netdev)) {
142 /* SJA1000 probe succeeded; turn LED off and return */
143 outb(0, pld_base + TSCAN1_LED);
144 netdev_info(netdev, "TS-CAN1 at 0x%lx 0x%lx irq %d\n",
145 pld_base, sja1000_base, irq);
146 return 0;
147 }
148
149 /* SJA1000 probe failed; release and try next address */
150 outb(0, pld_base + TSCAN1_MODE);
151 release_region(sja1000_base, TSCAN1_SJA1000_SIZE);
152 }
153
154 dev_err(dev, "failed to assign SJA1000 IO address\n");
155 dev_set_drvdata(dev, NULL);
156 free_sja1000dev(netdev);
157 release_region(pld_base, TSCAN1_PLD_SIZE);
158 return -ENXIO;
159}
160
161static void tscan1_remove(struct device *dev, unsigned id /*unused*/)
162{
163 struct net_device *netdev;
164 struct sja1000_priv *priv;
165 unsigned long pld_base, sja1000_base;
166
167 netdev = dev_get_drvdata(dev);
168 unregister_sja1000dev(netdev);
169 dev_set_drvdata(dev, NULL);
170
171 priv = netdev_priv(netdev);
172 pld_base = netdev->base_addr;
173 sja1000_base = (unsigned long)priv->reg_base;
174
175 outb(0, pld_base + TSCAN1_MODE); /* disable SJA1000 IO space */
176
177 release_region(sja1000_base, TSCAN1_SJA1000_SIZE);
178 release_region(pld_base, TSCAN1_PLD_SIZE);
179
180 free_sja1000dev(netdev);
181}
182
183static struct isa_driver tscan1_isa_driver = {
184 .probe = tscan1_probe,
185 .remove = tscan1_remove,
186 .driver = {
187 .name = "tscan1",
188 },
189};
190
191module_isa_driver(tscan1_isa_driver, TSCAN1_MAXDEV);
1/*
2 * tscan1.c: driver for Technologic Systems TS-CAN1 PC104 boards
3 *
4 * Copyright 2010 Andre B. Oliveira
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20/*
21 * References:
22 * - Getting started with TS-CAN1, Technologic Systems, Jun 2009
23 * http://www.embeddedarm.com/documentation/ts-can1-manual.pdf
24 */
25
26#include <linux/init.h>
27#include <linux/io.h>
28#include <linux/ioport.h>
29#include <linux/isa.h>
30#include <linux/module.h>
31#include <linux/netdevice.h>
32#include "sja1000.h"
33
34MODULE_DESCRIPTION("Driver for Technologic Systems TS-CAN1 PC104 boards");
35MODULE_AUTHOR("Andre B. Oliveira <anbadeol@gmail.com>");
36MODULE_LICENSE("GPL");
37
38/* Maximum number of boards (one in each JP1:JP2 setting of IO address) */
39#define TSCAN1_MAXDEV 4
40
41/* PLD registers address offsets */
42#define TSCAN1_ID1 0
43#define TSCAN1_ID2 1
44#define TSCAN1_VERSION 2
45#define TSCAN1_LED 3
46#define TSCAN1_PAGE 4
47#define TSCAN1_MODE 5
48#define TSCAN1_JUMPERS 6
49
50/* PLD board identifier registers magic values */
51#define TSCAN1_ID1_VALUE 0xf6
52#define TSCAN1_ID2_VALUE 0xb9
53
54/* PLD mode register SJA1000 IO enable bit */
55#define TSCAN1_MODE_ENABLE 0x40
56
57/* PLD jumpers register bits */
58#define TSCAN1_JP4 0x10
59#define TSCAN1_JP5 0x20
60
61/* PLD IO base addresses start */
62#define TSCAN1_PLD_ADDRESS 0x150
63
64/* PLD register space size */
65#define TSCAN1_PLD_SIZE 8
66
67/* SJA1000 register space size */
68#define TSCAN1_SJA1000_SIZE 32
69
70/* SJA1000 crystal frequency (16MHz) */
71#define TSCAN1_SJA1000_XTAL 16000000
72
73/* SJA1000 IO base addresses */
74static const unsigned short tscan1_sja1000_addresses[] __devinitconst = {
75 0x100, 0x120, 0x180, 0x1a0, 0x200, 0x240, 0x280, 0x320
76};
77
78/* Read SJA1000 register */
79static u8 tscan1_read(const struct sja1000_priv *priv, int reg)
80{
81 return inb((unsigned long)priv->reg_base + reg);
82}
83
84/* Write SJA1000 register */
85static void tscan1_write(const struct sja1000_priv *priv, int reg, u8 val)
86{
87 outb(val, (unsigned long)priv->reg_base + reg);
88}
89
90/* Probe for a TS-CAN1 board with JP2:JP1 jumper setting ID */
91static int __devinit tscan1_probe(struct device *dev, unsigned id)
92{
93 struct net_device *netdev;
94 struct sja1000_priv *priv;
95 unsigned long pld_base, sja1000_base;
96 int irq, i;
97
98 pld_base = TSCAN1_PLD_ADDRESS + id * TSCAN1_PLD_SIZE;
99 if (!request_region(pld_base, TSCAN1_PLD_SIZE, dev_name(dev)))
100 return -EBUSY;
101
102 if (inb(pld_base + TSCAN1_ID1) != TSCAN1_ID1_VALUE ||
103 inb(pld_base + TSCAN1_ID2) != TSCAN1_ID2_VALUE) {
104 release_region(pld_base, TSCAN1_PLD_SIZE);
105 return -ENODEV;
106 }
107
108 switch (inb(pld_base + TSCAN1_JUMPERS) & (TSCAN1_JP4 | TSCAN1_JP5)) {
109 case TSCAN1_JP4:
110 irq = 6;
111 break;
112 case TSCAN1_JP5:
113 irq = 7;
114 break;
115 case TSCAN1_JP4 | TSCAN1_JP5:
116 irq = 5;
117 break;
118 default:
119 dev_err(dev, "invalid JP4:JP5 setting (no IRQ)\n");
120 release_region(pld_base, TSCAN1_PLD_SIZE);
121 return -EINVAL;
122 }
123
124 netdev = alloc_sja1000dev(0);
125 if (!netdev) {
126 release_region(pld_base, TSCAN1_PLD_SIZE);
127 return -ENOMEM;
128 }
129
130 dev_set_drvdata(dev, netdev);
131 SET_NETDEV_DEV(netdev, dev);
132
133 netdev->base_addr = pld_base;
134 netdev->irq = irq;
135
136 priv = netdev_priv(netdev);
137 priv->read_reg = tscan1_read;
138 priv->write_reg = tscan1_write;
139 priv->can.clock.freq = TSCAN1_SJA1000_XTAL / 2;
140 priv->cdr = CDR_CBP | CDR_CLK_OFF;
141 priv->ocr = OCR_TX0_PUSHPULL;
142
143 /* Select the first SJA1000 IO address that is free and that works */
144 for (i = 0; i < ARRAY_SIZE(tscan1_sja1000_addresses); i++) {
145 sja1000_base = tscan1_sja1000_addresses[i];
146 if (!request_region(sja1000_base, TSCAN1_SJA1000_SIZE,
147 dev_name(dev)))
148 continue;
149
150 /* Set SJA1000 IO base address and enable it */
151 outb(TSCAN1_MODE_ENABLE | i, pld_base + TSCAN1_MODE);
152
153 priv->reg_base = (void __iomem *)sja1000_base;
154 if (!register_sja1000dev(netdev)) {
155 /* SJA1000 probe succeeded; turn LED off and return */
156 outb(0, pld_base + TSCAN1_LED);
157 netdev_info(netdev, "TS-CAN1 at 0x%lx 0x%lx irq %d\n",
158 pld_base, sja1000_base, irq);
159 return 0;
160 }
161
162 /* SJA1000 probe failed; release and try next address */
163 outb(0, pld_base + TSCAN1_MODE);
164 release_region(sja1000_base, TSCAN1_SJA1000_SIZE);
165 }
166
167 dev_err(dev, "failed to assign SJA1000 IO address\n");
168 dev_set_drvdata(dev, NULL);
169 free_sja1000dev(netdev);
170 release_region(pld_base, TSCAN1_PLD_SIZE);
171 return -ENXIO;
172}
173
174static int __devexit tscan1_remove(struct device *dev, unsigned id /*unused*/)
175{
176 struct net_device *netdev;
177 struct sja1000_priv *priv;
178 unsigned long pld_base, sja1000_base;
179
180 netdev = dev_get_drvdata(dev);
181 unregister_sja1000dev(netdev);
182 dev_set_drvdata(dev, NULL);
183
184 priv = netdev_priv(netdev);
185 pld_base = netdev->base_addr;
186 sja1000_base = (unsigned long)priv->reg_base;
187
188 outb(0, pld_base + TSCAN1_MODE); /* disable SJA1000 IO space */
189
190 release_region(sja1000_base, TSCAN1_SJA1000_SIZE);
191 release_region(pld_base, TSCAN1_PLD_SIZE);
192
193 free_sja1000dev(netdev);
194
195 return 0;
196}
197
198static struct isa_driver tscan1_isa_driver = {
199 .probe = tscan1_probe,
200 .remove = __devexit_p(tscan1_remove),
201 .driver = {
202 .name = "tscan1",
203 },
204};
205
206static int __init tscan1_init(void)
207{
208 return isa_register_driver(&tscan1_isa_driver, TSCAN1_MAXDEV);
209}
210module_init(tscan1_init);
211
212static void __exit tscan1_exit(void)
213{
214 isa_unregister_driver(&tscan1_isa_driver);
215}
216module_exit(tscan1_exit);