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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
4 */
5
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/platform_device.h>
9#include <linux/interrupt.h>
10#include <linux/netdevice.h>
11#include <linux/delay.h>
12#include <linux/irq.h>
13#include <linux/io.h>
14#include <linux/can/dev.h>
15#include <linux/can/platform/sja1000.h>
16
17#include "sja1000.h"
18
19#define DRV_NAME "sja1000_isa"
20
21#define MAXDEV 8
22
23MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
24MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
25MODULE_LICENSE("GPL v2");
26
27#define CLK_DEFAULT 16000000 /* 16 MHz */
28#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
29#define OCR_DEFAULT OCR_TX0_PUSHPULL
30
31static unsigned long port[MAXDEV];
32static unsigned long mem[MAXDEV];
33static int irq[MAXDEV];
34static int clk[MAXDEV];
35static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
36static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
37static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
38static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */
39
40module_param_hw_array(port, ulong, ioport, NULL, 0444);
41MODULE_PARM_DESC(port, "I/O port number");
42
43module_param_hw_array(mem, ulong, iomem, NULL, 0444);
44MODULE_PARM_DESC(mem, "I/O memory address");
45
46module_param_hw_array(indirect, int, ioport, NULL, 0444);
47MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
48
49module_param_hw_array(irq, int, irq, NULL, 0444);
50MODULE_PARM_DESC(irq, "IRQ number");
51
52module_param_array(clk, int, NULL, 0444);
53MODULE_PARM_DESC(clk, "External oscillator clock frequency "
54 "(default=16000000 [16 MHz])");
55
56module_param_array(cdr, byte, NULL, 0444);
57MODULE_PARM_DESC(cdr, "Clock divider register "
58 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
59
60module_param_array(ocr, byte, NULL, 0444);
61MODULE_PARM_DESC(ocr, "Output control register "
62 "(default=0x18 [OCR_TX0_PUSHPULL])");
63
64#define SJA1000_IOSIZE 0x20
65#define SJA1000_IOSIZE_INDIRECT 0x02
66
67static struct platform_device *sja1000_isa_devs[MAXDEV];
68
69static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
70{
71 return readb(priv->reg_base + reg);
72}
73
74static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
75 int reg, u8 val)
76{
77 writeb(val, priv->reg_base + reg);
78}
79
80static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
81{
82 return inb((unsigned long)priv->reg_base + reg);
83}
84
85static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
86 int reg, u8 val)
87{
88 outb(val, (unsigned long)priv->reg_base + reg);
89}
90
91static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
92 int reg)
93{
94 unsigned long flags, base = (unsigned long)priv->reg_base;
95 u8 readval;
96
97 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
98 outb(reg, base);
99 readval = inb(base + 1);
100 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
101
102 return readval;
103}
104
105static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
106 int reg, u8 val)
107{
108 unsigned long flags, base = (unsigned long)priv->reg_base;
109
110 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
111 outb(reg, base);
112 outb(val, base + 1);
113 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
114}
115
116static int sja1000_isa_probe(struct platform_device *pdev)
117{
118 struct net_device *dev;
119 struct sja1000_priv *priv;
120 void __iomem *base = NULL;
121 int iosize = SJA1000_IOSIZE;
122 int idx = pdev->id;
123 int err;
124
125 dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
126 idx, port[idx], mem[idx], irq[idx]);
127
128 if (mem[idx]) {
129 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
130 err = -EBUSY;
131 goto exit;
132 }
133 base = ioremap(mem[idx], iosize);
134 if (!base) {
135 err = -ENOMEM;
136 goto exit_release;
137 }
138 } else {
139 if (indirect[idx] > 0 ||
140 (indirect[idx] == -1 && indirect[0] > 0))
141 iosize = SJA1000_IOSIZE_INDIRECT;
142 if (!request_region(port[idx], iosize, DRV_NAME)) {
143 err = -EBUSY;
144 goto exit;
145 }
146 }
147
148 dev = alloc_sja1000dev(0);
149 if (!dev) {
150 err = -ENOMEM;
151 goto exit_unmap;
152 }
153 priv = netdev_priv(dev);
154
155 dev->irq = irq[idx];
156 priv->irq_flags = IRQF_SHARED;
157 if (mem[idx]) {
158 priv->reg_base = base;
159 dev->base_addr = mem[idx];
160 priv->read_reg = sja1000_isa_mem_read_reg;
161 priv->write_reg = sja1000_isa_mem_write_reg;
162 } else {
163 priv->reg_base = (void __iomem *)port[idx];
164 dev->base_addr = port[idx];
165
166 if (iosize == SJA1000_IOSIZE_INDIRECT) {
167 priv->read_reg = sja1000_isa_port_read_reg_indirect;
168 priv->write_reg = sja1000_isa_port_write_reg_indirect;
169 spin_lock_init(&indirect_lock[idx]);
170 } else {
171 priv->read_reg = sja1000_isa_port_read_reg;
172 priv->write_reg = sja1000_isa_port_write_reg;
173 }
174 }
175
176 if (clk[idx])
177 priv->can.clock.freq = clk[idx] / 2;
178 else if (clk[0])
179 priv->can.clock.freq = clk[0] / 2;
180 else
181 priv->can.clock.freq = CLK_DEFAULT / 2;
182
183 if (ocr[idx] != 0xff)
184 priv->ocr = ocr[idx];
185 else if (ocr[0] != 0xff)
186 priv->ocr = ocr[0];
187 else
188 priv->ocr = OCR_DEFAULT;
189
190 if (cdr[idx] != 0xff)
191 priv->cdr = cdr[idx];
192 else if (cdr[0] != 0xff)
193 priv->cdr = cdr[0];
194 else
195 priv->cdr = CDR_DEFAULT;
196
197 platform_set_drvdata(pdev, dev);
198 SET_NETDEV_DEV(dev, &pdev->dev);
199 dev->dev_id = idx;
200
201 err = register_sja1000dev(dev);
202 if (err) {
203 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
204 DRV_NAME, err);
205 goto exit_free;
206 }
207
208 dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
209 DRV_NAME, priv->reg_base, dev->irq);
210 return 0;
211
212exit_free:
213 free_sja1000dev(dev);
214exit_unmap:
215 if (mem[idx])
216 iounmap(base);
217exit_release:
218 if (mem[idx])
219 release_mem_region(mem[idx], iosize);
220 else
221 release_region(port[idx], iosize);
222exit:
223 return err;
224}
225
226static void sja1000_isa_remove(struct platform_device *pdev)
227{
228 struct net_device *dev = platform_get_drvdata(pdev);
229 struct sja1000_priv *priv = netdev_priv(dev);
230 int idx = pdev->id;
231
232 unregister_sja1000dev(dev);
233
234 if (mem[idx]) {
235 iounmap(priv->reg_base);
236 release_mem_region(mem[idx], SJA1000_IOSIZE);
237 } else {
238 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
239 release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
240 else
241 release_region(port[idx], SJA1000_IOSIZE);
242 }
243 free_sja1000dev(dev);
244}
245
246static struct platform_driver sja1000_isa_driver = {
247 .probe = sja1000_isa_probe,
248 .remove_new = sja1000_isa_remove,
249 .driver = {
250 .name = DRV_NAME,
251 },
252};
253
254static int __init sja1000_isa_init(void)
255{
256 int idx, err;
257
258 for (idx = 0; idx < MAXDEV; idx++) {
259 if ((port[idx] || mem[idx]) && irq[idx]) {
260 sja1000_isa_devs[idx] =
261 platform_device_alloc(DRV_NAME, idx);
262 if (!sja1000_isa_devs[idx]) {
263 err = -ENOMEM;
264 goto exit_free_devices;
265 }
266 err = platform_device_add(sja1000_isa_devs[idx]);
267 if (err) {
268 platform_device_put(sja1000_isa_devs[idx]);
269 goto exit_free_devices;
270 }
271 pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
272 "irq=%d\n",
273 DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
274 } else if (idx == 0 || port[idx] || mem[idx]) {
275 pr_err("%s: insufficient parameters supplied\n",
276 DRV_NAME);
277 err = -EINVAL;
278 goto exit_free_devices;
279 }
280 }
281
282 err = platform_driver_register(&sja1000_isa_driver);
283 if (err)
284 goto exit_free_devices;
285
286 pr_info("Legacy %s driver for max. %d devices registered\n",
287 DRV_NAME, MAXDEV);
288
289 return 0;
290
291exit_free_devices:
292 while (--idx >= 0) {
293 if (sja1000_isa_devs[idx])
294 platform_device_unregister(sja1000_isa_devs[idx]);
295 }
296
297 return err;
298}
299
300static void __exit sja1000_isa_exit(void)
301{
302 int idx;
303
304 platform_driver_unregister(&sja1000_isa_driver);
305 for (idx = 0; idx < MAXDEV; idx++) {
306 if (sja1000_isa_devs[idx])
307 platform_device_unregister(sja1000_isa_devs[idx]);
308 }
309}
310
311module_init(sja1000_isa_init);
312module_exit(sja1000_isa_exit);
1/*
2 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the version 2 of the GNU General Public License
6 * as published by the Free Software Foundation
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/isa.h>
21#include <linux/interrupt.h>
22#include <linux/netdevice.h>
23#include <linux/delay.h>
24#include <linux/irq.h>
25#include <linux/io.h>
26#include <linux/can/dev.h>
27#include <linux/can/platform/sja1000.h>
28
29#include "sja1000.h"
30
31#define DRV_NAME "sja1000_isa"
32
33#define MAXDEV 8
34
35MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
36MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
37MODULE_LICENSE("GPL v2");
38
39#define CLK_DEFAULT 16000000 /* 16 MHz */
40#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
41#define OCR_DEFAULT OCR_TX0_PUSHPULL
42
43static unsigned long port[MAXDEV];
44static unsigned long mem[MAXDEV];
45static int __devinitdata irq[MAXDEV];
46static int __devinitdata clk[MAXDEV];
47static char __devinitdata cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
48static char __devinitdata ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
49static char __devinitdata indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
50
51module_param_array(port, ulong, NULL, S_IRUGO);
52MODULE_PARM_DESC(port, "I/O port number");
53
54module_param_array(mem, ulong, NULL, S_IRUGO);
55MODULE_PARM_DESC(mem, "I/O memory address");
56
57module_param_array(indirect, byte, NULL, S_IRUGO);
58MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
59
60module_param_array(irq, int, NULL, S_IRUGO);
61MODULE_PARM_DESC(irq, "IRQ number");
62
63module_param_array(clk, int, NULL, S_IRUGO);
64MODULE_PARM_DESC(clk, "External oscillator clock frequency "
65 "(default=16000000 [16 MHz])");
66
67module_param_array(cdr, byte, NULL, S_IRUGO);
68MODULE_PARM_DESC(cdr, "Clock divider register "
69 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
70
71module_param_array(ocr, byte, NULL, S_IRUGO);
72MODULE_PARM_DESC(ocr, "Output control register "
73 "(default=0x18 [OCR_TX0_PUSHPULL])");
74
75#define SJA1000_IOSIZE 0x20
76#define SJA1000_IOSIZE_INDIRECT 0x02
77
78static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
79{
80 return readb(priv->reg_base + reg);
81}
82
83static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
84 int reg, u8 val)
85{
86 writeb(val, priv->reg_base + reg);
87}
88
89static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
90{
91 return inb((unsigned long)priv->reg_base + reg);
92}
93
94static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
95 int reg, u8 val)
96{
97 outb(val, (unsigned long)priv->reg_base + reg);
98}
99
100static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
101 int reg)
102{
103 unsigned long base = (unsigned long)priv->reg_base;
104
105 outb(reg, base);
106 return inb(base + 1);
107}
108
109static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
110 int reg, u8 val)
111{
112 unsigned long base = (unsigned long)priv->reg_base;
113
114 outb(reg, base);
115 outb(val, base + 1);
116}
117
118static int __devinit sja1000_isa_match(struct device *pdev, unsigned int idx)
119{
120 if (port[idx] || mem[idx]) {
121 if (irq[idx])
122 return 1;
123 } else if (idx)
124 return 0;
125
126 dev_err(pdev, "insufficient parameters supplied\n");
127 return 0;
128}
129
130static int __devinit sja1000_isa_probe(struct device *pdev, unsigned int idx)
131{
132 struct net_device *dev;
133 struct sja1000_priv *priv;
134 void __iomem *base = NULL;
135 int iosize = SJA1000_IOSIZE;
136 int err;
137
138 if (mem[idx]) {
139 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
140 err = -EBUSY;
141 goto exit;
142 }
143 base = ioremap_nocache(mem[idx], iosize);
144 if (!base) {
145 err = -ENOMEM;
146 goto exit_release;
147 }
148 } else {
149 if (indirect[idx] > 0 ||
150 (indirect[idx] == -1 && indirect[0] > 0))
151 iosize = SJA1000_IOSIZE_INDIRECT;
152 if (!request_region(port[idx], iosize, DRV_NAME)) {
153 err = -EBUSY;
154 goto exit;
155 }
156 }
157
158 dev = alloc_sja1000dev(0);
159 if (!dev) {
160 err = -ENOMEM;
161 goto exit_unmap;
162 }
163 priv = netdev_priv(dev);
164
165 dev->irq = irq[idx];
166 priv->irq_flags = IRQF_SHARED;
167 if (mem[idx]) {
168 priv->reg_base = base;
169 dev->base_addr = mem[idx];
170 priv->read_reg = sja1000_isa_mem_read_reg;
171 priv->write_reg = sja1000_isa_mem_write_reg;
172 } else {
173 priv->reg_base = (void __iomem *)port[idx];
174 dev->base_addr = port[idx];
175
176 if (iosize == SJA1000_IOSIZE_INDIRECT) {
177 priv->read_reg = sja1000_isa_port_read_reg_indirect;
178 priv->write_reg = sja1000_isa_port_write_reg_indirect;
179 } else {
180 priv->read_reg = sja1000_isa_port_read_reg;
181 priv->write_reg = sja1000_isa_port_write_reg;
182 }
183 }
184
185 if (clk[idx])
186 priv->can.clock.freq = clk[idx] / 2;
187 else if (clk[0])
188 priv->can.clock.freq = clk[0] / 2;
189 else
190 priv->can.clock.freq = CLK_DEFAULT / 2;
191
192 if (ocr[idx] != -1)
193 priv->ocr = ocr[idx] & 0xff;
194 else if (ocr[0] != -1)
195 priv->ocr = ocr[0] & 0xff;
196 else
197 priv->ocr = OCR_DEFAULT;
198
199 if (cdr[idx] != -1)
200 priv->cdr = cdr[idx] & 0xff;
201 else if (cdr[0] != -1)
202 priv->cdr = cdr[0] & 0xff;
203 else
204 priv->cdr = CDR_DEFAULT;
205
206 dev_set_drvdata(pdev, dev);
207 SET_NETDEV_DEV(dev, pdev);
208
209 err = register_sja1000dev(dev);
210 if (err) {
211 dev_err(pdev, "registering %s failed (err=%d)\n",
212 DRV_NAME, err);
213 goto exit_unmap;
214 }
215
216 dev_info(pdev, "%s device registered (reg_base=0x%p, irq=%d)\n",
217 DRV_NAME, priv->reg_base, dev->irq);
218 return 0;
219
220 exit_unmap:
221 if (mem[idx])
222 iounmap(base);
223 exit_release:
224 if (mem[idx])
225 release_mem_region(mem[idx], iosize);
226 else
227 release_region(port[idx], iosize);
228 exit:
229 return err;
230}
231
232static int __devexit sja1000_isa_remove(struct device *pdev, unsigned int idx)
233{
234 struct net_device *dev = dev_get_drvdata(pdev);
235 struct sja1000_priv *priv = netdev_priv(dev);
236
237 unregister_sja1000dev(dev);
238 dev_set_drvdata(pdev, NULL);
239
240 if (mem[idx]) {
241 iounmap(priv->reg_base);
242 release_mem_region(mem[idx], SJA1000_IOSIZE);
243 } else {
244 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
245 release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
246 else
247 release_region(port[idx], SJA1000_IOSIZE);
248 }
249 free_sja1000dev(dev);
250
251 return 0;
252}
253
254static struct isa_driver sja1000_isa_driver = {
255 .match = sja1000_isa_match,
256 .probe = sja1000_isa_probe,
257 .remove = __devexit_p(sja1000_isa_remove),
258 .driver = {
259 .name = DRV_NAME,
260 },
261};
262
263static int __init sja1000_isa_init(void)
264{
265 int err = isa_register_driver(&sja1000_isa_driver, MAXDEV);
266
267 if (!err)
268 printk(KERN_INFO
269 "Legacy %s driver for max. %d devices registered\n",
270 DRV_NAME, MAXDEV);
271 return err;
272}
273
274static void __exit sja1000_isa_exit(void)
275{
276 isa_unregister_driver(&sja1000_isa_driver);
277}
278
279module_init(sja1000_isa_init);
280module_exit(sja1000_isa_exit);