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2a6ba39a WG |
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 | |
05780d98 | 14 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
2a6ba39a WG |
15 | */ |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
1839a6c6 | 19 | #include <linux/platform_device.h> |
2a6ba39a WG |
20 | #include <linux/interrupt.h> |
21 | #include <linux/netdevice.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/irq.h> | |
24 | #include <linux/io.h> | |
2a6ba39a WG |
25 | #include <linux/can/dev.h> |
26 | #include <linux/can/platform/sja1000.h> | |
27 | ||
28 | #include "sja1000.h" | |
29 | ||
30 | #define DRV_NAME "sja1000_isa" | |
31 | ||
32 | #define MAXDEV 8 | |
33 | ||
34 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
35 | MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus"); | |
36 | MODULE_LICENSE("GPL v2"); | |
37 | ||
38 | #define CLK_DEFAULT 16000000 /* 16 MHz */ | |
39 | #define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF) | |
40 | #define OCR_DEFAULT OCR_TX0_PUSHPULL | |
41 | ||
42 | static unsigned long port[MAXDEV]; | |
43 | static unsigned long mem[MAXDEV]; | |
3c8ac0f2 BP |
44 | static int irq[MAXDEV]; |
45 | static int clk[MAXDEV]; | |
46 | static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; | |
47 | static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; | |
48 | static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; | |
a9edcded | 49 | static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */ |
2a6ba39a | 50 | |
d61e4038 | 51 | module_param_hw_array(port, ulong, ioport, NULL, 0444); |
2a6ba39a WG |
52 | MODULE_PARM_DESC(port, "I/O port number"); |
53 | ||
d61e4038 | 54 | module_param_hw_array(mem, ulong, iomem, NULL, 0444); |
2a6ba39a WG |
55 | MODULE_PARM_DESC(mem, "I/O memory address"); |
56 | ||
d61e4038 | 57 | module_param_hw_array(indirect, int, ioport, NULL, 0444); |
2a6ba39a WG |
58 | MODULE_PARM_DESC(indirect, "Indirect access via address and data port"); |
59 | ||
d61e4038 | 60 | module_param_hw_array(irq, int, irq, NULL, 0444); |
2a6ba39a WG |
61 | MODULE_PARM_DESC(irq, "IRQ number"); |
62 | ||
d61e4038 | 63 | module_param_array(clk, int, NULL, 0444); |
2a6ba39a WG |
64 | MODULE_PARM_DESC(clk, "External oscillator clock frequency " |
65 | "(default=16000000 [16 MHz])"); | |
66 | ||
d61e4038 | 67 | module_param_array(cdr, byte, NULL, 0444); |
2a6ba39a WG |
68 | MODULE_PARM_DESC(cdr, "Clock divider register " |
69 | "(default=0x48 [CDR_CBP | CDR_CLK_OFF])"); | |
70 | ||
d61e4038 | 71 | module_param_array(ocr, byte, NULL, 0444); |
2a6ba39a WG |
72 | MODULE_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 | ||
1839a6c6 WG |
78 | static struct platform_device *sja1000_isa_devs[MAXDEV]; |
79 | ||
2a6ba39a WG |
80 | static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg) |
81 | { | |
82 | return readb(priv->reg_base + reg); | |
83 | } | |
84 | ||
85 | static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv, | |
86 | int reg, u8 val) | |
87 | { | |
88 | writeb(val, priv->reg_base + reg); | |
89 | } | |
90 | ||
91 | static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg) | |
92 | { | |
93 | return inb((unsigned long)priv->reg_base + reg); | |
94 | } | |
95 | ||
96 | static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv, | |
97 | int reg, u8 val) | |
98 | { | |
99 | outb(val, (unsigned long)priv->reg_base + reg); | |
100 | } | |
101 | ||
102 | static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv, | |
103 | int reg) | |
104 | { | |
a9edcded OH |
105 | unsigned long flags, base = (unsigned long)priv->reg_base; |
106 | u8 readval; | |
2a6ba39a | 107 | |
a9edcded | 108 | spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); |
2a6ba39a | 109 | outb(reg, base); |
a9edcded OH |
110 | readval = inb(base + 1); |
111 | spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); | |
112 | ||
113 | return readval; | |
2a6ba39a WG |
114 | } |
115 | ||
116 | static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv, | |
117 | int reg, u8 val) | |
118 | { | |
a9edcded | 119 | unsigned long flags, base = (unsigned long)priv->reg_base; |
2a6ba39a | 120 | |
a9edcded | 121 | spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); |
2a6ba39a WG |
122 | outb(reg, base); |
123 | outb(val, base + 1); | |
a9edcded | 124 | spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); |
2a6ba39a WG |
125 | } |
126 | ||
3c8ac0f2 | 127 | static int sja1000_isa_probe(struct platform_device *pdev) |
2a6ba39a WG |
128 | { |
129 | struct net_device *dev; | |
130 | struct sja1000_priv *priv; | |
131 | void __iomem *base = NULL; | |
132 | int iosize = SJA1000_IOSIZE; | |
1839a6c6 | 133 | int idx = pdev->id; |
2a6ba39a WG |
134 | int err; |
135 | ||
1839a6c6 WG |
136 | dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n", |
137 | idx, port[idx], mem[idx], irq[idx]); | |
138 | ||
2a6ba39a WG |
139 | if (mem[idx]) { |
140 | if (!request_mem_region(mem[idx], iosize, DRV_NAME)) { | |
141 | err = -EBUSY; | |
142 | goto exit; | |
143 | } | |
144 | base = ioremap_nocache(mem[idx], iosize); | |
145 | if (!base) { | |
146 | err = -ENOMEM; | |
147 | goto exit_release; | |
148 | } | |
149 | } else { | |
150 | if (indirect[idx] > 0 || | |
151 | (indirect[idx] == -1 && indirect[0] > 0)) | |
152 | iosize = SJA1000_IOSIZE_INDIRECT; | |
153 | if (!request_region(port[idx], iosize, DRV_NAME)) { | |
154 | err = -EBUSY; | |
155 | goto exit; | |
156 | } | |
157 | } | |
158 | ||
159 | dev = alloc_sja1000dev(0); | |
160 | if (!dev) { | |
161 | err = -ENOMEM; | |
162 | goto exit_unmap; | |
163 | } | |
164 | priv = netdev_priv(dev); | |
165 | ||
166 | dev->irq = irq[idx]; | |
167 | priv->irq_flags = IRQF_SHARED; | |
168 | if (mem[idx]) { | |
169 | priv->reg_base = base; | |
170 | dev->base_addr = mem[idx]; | |
171 | priv->read_reg = sja1000_isa_mem_read_reg; | |
172 | priv->write_reg = sja1000_isa_mem_write_reg; | |
173 | } else { | |
174 | priv->reg_base = (void __iomem *)port[idx]; | |
175 | dev->base_addr = port[idx]; | |
176 | ||
177 | if (iosize == SJA1000_IOSIZE_INDIRECT) { | |
178 | priv->read_reg = sja1000_isa_port_read_reg_indirect; | |
179 | priv->write_reg = sja1000_isa_port_write_reg_indirect; | |
a9edcded | 180 | spin_lock_init(&indirect_lock[idx]); |
2a6ba39a WG |
181 | } else { |
182 | priv->read_reg = sja1000_isa_port_read_reg; | |
183 | priv->write_reg = sja1000_isa_port_write_reg; | |
184 | } | |
185 | } | |
186 | ||
187 | if (clk[idx]) | |
188 | priv->can.clock.freq = clk[idx] / 2; | |
189 | else if (clk[0]) | |
190 | priv->can.clock.freq = clk[0] / 2; | |
191 | else | |
192 | priv->can.clock.freq = CLK_DEFAULT / 2; | |
193 | ||
115d2a3d WG |
194 | if (ocr[idx] != 0xff) |
195 | priv->ocr = ocr[idx]; | |
196 | else if (ocr[0] != 0xff) | |
197 | priv->ocr = ocr[0]; | |
2a6ba39a WG |
198 | else |
199 | priv->ocr = OCR_DEFAULT; | |
200 | ||
115d2a3d WG |
201 | if (cdr[idx] != 0xff) |
202 | priv->cdr = cdr[idx]; | |
203 | else if (cdr[0] != 0xff) | |
204 | priv->cdr = cdr[0]; | |
2a6ba39a WG |
205 | else |
206 | priv->cdr = CDR_DEFAULT; | |
207 | ||
00e4bbc8 | 208 | platform_set_drvdata(pdev, dev); |
1839a6c6 | 209 | SET_NETDEV_DEV(dev, &pdev->dev); |
a9edcded | 210 | dev->dev_id = idx; |
2a6ba39a WG |
211 | |
212 | err = register_sja1000dev(dev); | |
213 | if (err) { | |
1839a6c6 | 214 | dev_err(&pdev->dev, "registering %s failed (err=%d)\n", |
2a6ba39a WG |
215 | DRV_NAME, err); |
216 | goto exit_unmap; | |
217 | } | |
218 | ||
1839a6c6 | 219 | dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n", |
2a6ba39a WG |
220 | DRV_NAME, priv->reg_base, dev->irq); |
221 | return 0; | |
222 | ||
223 | exit_unmap: | |
224 | if (mem[idx]) | |
225 | iounmap(base); | |
226 | exit_release: | |
227 | if (mem[idx]) | |
228 | release_mem_region(mem[idx], iosize); | |
229 | else | |
230 | release_region(port[idx], iosize); | |
231 | exit: | |
232 | return err; | |
233 | } | |
234 | ||
3c8ac0f2 | 235 | static int sja1000_isa_remove(struct platform_device *pdev) |
2a6ba39a | 236 | { |
00e4bbc8 | 237 | struct net_device *dev = platform_get_drvdata(pdev); |
2a6ba39a | 238 | struct sja1000_priv *priv = netdev_priv(dev); |
1839a6c6 | 239 | int idx = pdev->id; |
2a6ba39a WG |
240 | |
241 | unregister_sja1000dev(dev); | |
2a6ba39a WG |
242 | |
243 | if (mem[idx]) { | |
244 | iounmap(priv->reg_base); | |
245 | release_mem_region(mem[idx], SJA1000_IOSIZE); | |
246 | } else { | |
247 | if (priv->read_reg == sja1000_isa_port_read_reg_indirect) | |
248 | release_region(port[idx], SJA1000_IOSIZE_INDIRECT); | |
249 | else | |
250 | release_region(port[idx], SJA1000_IOSIZE); | |
251 | } | |
252 | free_sja1000dev(dev); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
1839a6c6 | 257 | static struct platform_driver sja1000_isa_driver = { |
2a6ba39a | 258 | .probe = sja1000_isa_probe, |
3c8ac0f2 | 259 | .remove = sja1000_isa_remove, |
2a6ba39a WG |
260 | .driver = { |
261 | .name = DRV_NAME, | |
262 | }, | |
263 | }; | |
264 | ||
265 | static int __init sja1000_isa_init(void) | |
266 | { | |
1839a6c6 WG |
267 | int idx, err; |
268 | ||
269 | for (idx = 0; idx < MAXDEV; idx++) { | |
270 | if ((port[idx] || mem[idx]) && irq[idx]) { | |
271 | sja1000_isa_devs[idx] = | |
272 | platform_device_alloc(DRV_NAME, idx); | |
273 | if (!sja1000_isa_devs[idx]) { | |
274 | err = -ENOMEM; | |
275 | goto exit_free_devices; | |
276 | } | |
277 | err = platform_device_add(sja1000_isa_devs[idx]); | |
278 | if (err) { | |
279 | platform_device_put(sja1000_isa_devs[idx]); | |
280 | goto exit_free_devices; | |
281 | } | |
282 | pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, " | |
283 | "irq=%d\n", | |
284 | DRV_NAME, idx, port[idx], mem[idx], irq[idx]); | |
285 | } else if (idx == 0 || port[idx] || mem[idx]) { | |
286 | pr_err("%s: insufficient parameters supplied\n", | |
287 | DRV_NAME); | |
288 | err = -EINVAL; | |
289 | goto exit_free_devices; | |
290 | } | |
291 | } | |
292 | ||
293 | err = platform_driver_register(&sja1000_isa_driver); | |
294 | if (err) | |
295 | goto exit_free_devices; | |
296 | ||
297 | pr_info("Legacy %s driver for max. %d devices registered\n", | |
298 | DRV_NAME, MAXDEV); | |
299 | ||
300 | return 0; | |
301 | ||
302 | exit_free_devices: | |
303 | while (--idx >= 0) { | |
304 | if (sja1000_isa_devs[idx]) | |
305 | platform_device_unregister(sja1000_isa_devs[idx]); | |
306 | } | |
2a6ba39a | 307 | |
2a6ba39a WG |
308 | return err; |
309 | } | |
310 | ||
311 | static void __exit sja1000_isa_exit(void) | |
312 | { | |
1839a6c6 WG |
313 | int idx; |
314 | ||
315 | platform_driver_unregister(&sja1000_isa_driver); | |
316 | for (idx = 0; idx < MAXDEV; idx++) { | |
317 | if (sja1000_isa_devs[idx]) | |
318 | platform_device_unregister(sja1000_isa_devs[idx]); | |
319 | } | |
2a6ba39a WG |
320 | } |
321 | ||
322 | module_init(sja1000_isa_init); | |
323 | module_exit(sja1000_isa_exit); |