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1da177e4 LT |
1 | /* ------------------------------------------------------------------------- */ |
2 | /* i2c-elektor.c i2c-hw access for PCF8584 style isa bus adaptes */ | |
3 | /* ------------------------------------------------------------------------- */ | |
4 | /* Copyright (C) 1995-97 Simon G. Vogl | |
5 | 1998-99 Hans Berglund | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
ca1f8da9 | 15 | GNU General Public License for more details. */ |
1da177e4 LT |
16 | /* ------------------------------------------------------------------------- */ |
17 | ||
96de0e25 | 18 | /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even |
1da177e4 LT |
19 | Frodo Looijaard <frodol@dds.nl> */ |
20 | ||
25985edc | 21 | /* Partially rewriten by Oleg I. Vdovikin for mmapped support of |
1da177e4 LT |
22 | for Alpha Processor Inc. UP-2000(+) boards */ |
23 | ||
1da177e4 LT |
24 | #include <linux/kernel.h> |
25 | #include <linux/ioport.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/delay.h> | |
1da177e4 LT |
28 | #include <linux/init.h> |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/pci.h> | |
31 | #include <linux/wait.h> | |
32 | ||
4a5d3030 | 33 | #include <linux/isa.h> |
1da177e4 LT |
34 | #include <linux/i2c.h> |
35 | #include <linux/i2c-algo-pcf.h> | |
21782180 | 36 | #include <linux/io.h> |
1da177e4 | 37 | |
1da177e4 LT |
38 | #include <asm/irq.h> |
39 | ||
40 | #include "../algos/i2c-algo-pcf.h" | |
41 | ||
42 | #define DEFAULT_BASE 0x330 | |
43 | ||
44 | static int base; | |
3634ff6a ST |
45 | static u8 __iomem *base_iomem; |
46 | ||
1da177e4 LT |
47 | static int irq; |
48 | static int clock = 0x1c; | |
49 | static int own = 0x55; | |
50 | static int mmapped; | |
51 | ||
fe3d6a99 | 52 | /* vdovikin: removed static struct i2c_pcf_isa gpi; code - |
1da177e4 LT |
53 | this module in real supports only one device, due to missing arguments |
54 | in some functions, called from the algo-pcf module. Sometimes it's | |
55 | need to be rewriten - but for now just remove this for simpler reading */ | |
56 | ||
57 | static wait_queue_head_t pcf_wait; | |
58 | static int pcf_pending; | |
59 | static spinlock_t lock; | |
60 | ||
fe3d6a99 ST |
61 | static struct i2c_adapter pcf_isa_ops; |
62 | ||
1da177e4 LT |
63 | /* ----- local functions ---------------------------------------------- */ |
64 | ||
65 | static void pcf_isa_setbyte(void *data, int ctl, int val) | |
66 | { | |
3634ff6a | 67 | u8 __iomem *address = ctl ? (base_iomem + 1) : base_iomem; |
1da177e4 LT |
68 | |
69 | /* enable irq if any specified for serial operation */ | |
70 | if (ctl && irq && (val & I2C_PCF_ESO)) { | |
71 | val |= I2C_PCF_ENI; | |
72 | } | |
73 | ||
fe3d6a99 | 74 | pr_debug("%s: Write %p 0x%02X\n", pcf_isa_ops.name, address, val); |
3634ff6a ST |
75 | iowrite8(val, address); |
76 | #ifdef __alpha__ | |
77 | /* API UP2000 needs some hardware fudging to make the write stick */ | |
78 | iowrite8(val, address); | |
79 | #endif | |
1da177e4 LT |
80 | } |
81 | ||
82 | static int pcf_isa_getbyte(void *data, int ctl) | |
83 | { | |
3634ff6a ST |
84 | u8 __iomem *address = ctl ? (base_iomem + 1) : base_iomem; |
85 | int val = ioread8(address); | |
1da177e4 | 86 | |
fe3d6a99 | 87 | pr_debug("%s: Read %p 0x%02X\n", pcf_isa_ops.name, address, val); |
1da177e4 LT |
88 | return (val); |
89 | } | |
90 | ||
91 | static int pcf_isa_getown(void *data) | |
92 | { | |
93 | return (own); | |
94 | } | |
95 | ||
96 | ||
97 | static int pcf_isa_getclock(void *data) | |
98 | { | |
99 | return (clock); | |
100 | } | |
101 | ||
08e5338d DM |
102 | static void pcf_isa_waitforpin(void *data) |
103 | { | |
1da177e4 LT |
104 | DEFINE_WAIT(wait); |
105 | int timeout = 2; | |
106 | unsigned long flags; | |
107 | ||
108 | if (irq > 0) { | |
109 | spin_lock_irqsave(&lock, flags); | |
110 | if (pcf_pending == 0) { | |
111 | spin_unlock_irqrestore(&lock, flags); | |
112 | prepare_to_wait(&pcf_wait, &wait, TASK_INTERRUPTIBLE); | |
113 | if (schedule_timeout(timeout*HZ)) { | |
114 | spin_lock_irqsave(&lock, flags); | |
115 | if (pcf_pending == 1) { | |
116 | pcf_pending = 0; | |
117 | } | |
118 | spin_unlock_irqrestore(&lock, flags); | |
119 | } | |
120 | finish_wait(&pcf_wait, &wait); | |
121 | } else { | |
122 | pcf_pending = 0; | |
123 | spin_unlock_irqrestore(&lock, flags); | |
124 | } | |
125 | } else { | |
126 | udelay(100); | |
127 | } | |
128 | } | |
129 | ||
130 | ||
7d12e780 | 131 | static irqreturn_t pcf_isa_handler(int this_irq, void *dev_id) { |
1da177e4 LT |
132 | spin_lock(&lock); |
133 | pcf_pending = 1; | |
134 | spin_unlock(&lock); | |
135 | wake_up_interruptible(&pcf_wait); | |
136 | return IRQ_HANDLED; | |
137 | } | |
138 | ||
139 | ||
140 | static int pcf_isa_init(void) | |
141 | { | |
142 | spin_lock_init(&lock); | |
143 | if (!mmapped) { | |
fe3d6a99 ST |
144 | if (!request_region(base, 2, pcf_isa_ops.name)) { |
145 | printk(KERN_ERR "%s: requested I/O region (%#x:2) is " | |
146 | "in use\n", pcf_isa_ops.name, base); | |
1da177e4 LT |
147 | return -ENODEV; |
148 | } | |
3634ff6a ST |
149 | base_iomem = ioport_map(base, 2); |
150 | if (!base_iomem) { | |
fe3d6a99 ST |
151 | printk(KERN_ERR "%s: remap of I/O region %#x failed\n", |
152 | pcf_isa_ops.name, base); | |
3634ff6a ST |
153 | release_region(base, 2); |
154 | return -ENODEV; | |
155 | } | |
156 | } else { | |
fe3d6a99 ST |
157 | if (!request_mem_region(base, 2, pcf_isa_ops.name)) { |
158 | printk(KERN_ERR "%s: requested memory region (%#x:2) " | |
159 | "is in use\n", pcf_isa_ops.name, base); | |
3634ff6a ST |
160 | return -ENODEV; |
161 | } | |
162 | base_iomem = ioremap(base, 2); | |
163 | if (base_iomem == NULL) { | |
fe3d6a99 ST |
164 | printk(KERN_ERR "%s: remap of memory region %#x " |
165 | "failed\n", pcf_isa_ops.name, base); | |
3634ff6a ST |
166 | release_mem_region(base, 2); |
167 | return -ENODEV; | |
168 | } | |
1da177e4 | 169 | } |
fe3d6a99 | 170 | pr_debug("%s: registers %#x remapped to %p\n", pcf_isa_ops.name, base, |
3634ff6a ST |
171 | base_iomem); |
172 | ||
1da177e4 | 173 | if (irq > 0) { |
fe3d6a99 ST |
174 | if (request_irq(irq, pcf_isa_handler, 0, pcf_isa_ops.name, |
175 | NULL) < 0) { | |
176 | printk(KERN_ERR "%s: Request irq%d failed\n", | |
177 | pcf_isa_ops.name, irq); | |
1da177e4 LT |
178 | irq = 0; |
179 | } else | |
180 | enable_irq(irq); | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
185 | /* ------------------------------------------------------------------------ | |
186 | * Encapsulate the above functions in the correct operations structure. | |
187 | * This is only done when more than one hardware adapter is supported. | |
188 | */ | |
189 | static struct i2c_algo_pcf_data pcf_isa_data = { | |
190 | .setpcf = pcf_isa_setbyte, | |
191 | .getpcf = pcf_isa_getbyte, | |
192 | .getown = pcf_isa_getown, | |
193 | .getclock = pcf_isa_getclock, | |
194 | .waitforpin = pcf_isa_waitforpin, | |
1da177e4 LT |
195 | }; |
196 | ||
197 | static struct i2c_adapter pcf_isa_ops = { | |
198 | .owner = THIS_MODULE, | |
3401b2ff | 199 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
1da177e4 | 200 | .algo_data = &pcf_isa_data, |
fe3d6a99 | 201 | .name = "i2c-elektor", |
1da177e4 LT |
202 | }; |
203 | ||
0b255e92 | 204 | static int elektor_match(struct device *dev, unsigned int id) |
1da177e4 LT |
205 | { |
206 | #ifdef __alpha__ | |
fe3d6a99 | 207 | /* check to see we have memory mapped PCF8584 connected to the |
1da177e4 LT |
208 | Cypress cy82c693 PCI-ISA bridge as on UP2000 board */ |
209 | if (base == 0) { | |
210 | struct pci_dev *cy693_dev; | |
fe3d6a99 ST |
211 | |
212 | cy693_dev = pci_get_device(PCI_VENDOR_ID_CONTAQ, | |
1da177e4 LT |
213 | PCI_DEVICE_ID_CONTAQ_82C693, NULL); |
214 | if (cy693_dev) { | |
3634ff6a | 215 | unsigned char config; |
1da177e4 LT |
216 | /* yeap, we've found cypress, let's check config */ |
217 | if (!pci_read_config_byte(cy693_dev, 0x47, &config)) { | |
fe3d6a99 | 218 | |
4a5d3030 JD |
219 | dev_dbg(dev, "found cy82c693, config " |
220 | "register 0x47 = 0x%02x\n", config); | |
1da177e4 LT |
221 | |
222 | /* UP2000 board has this register set to 0xe1, | |
fe3d6a99 | 223 | but the most significant bit as seems can be |
1da177e4 | 224 | reset during the proper initialisation |
fe3d6a99 ST |
225 | sequence if guys from API decides to do that |
226 | (so, we can even enable Tsunami Pchip | |
227 | window for the upper 1 Gb) */ | |
1da177e4 LT |
228 | |
229 | /* so just check for ROMCS at 0xe0000, | |
fe3d6a99 | 230 | ROMCS enabled for writes |
1da177e4 LT |
231 | and external XD Bus buffer in use. */ |
232 | if ((config & 0x7f) == 0x61) { | |
233 | /* seems to be UP2000 like board */ | |
234 | base = 0xe0000; | |
3634ff6a | 235 | mmapped = 1; |
fe3d6a99 | 236 | /* UP2000 drives ISA with |
1da177e4 LT |
237 | 8.25 MHz (PCI/4) clock |
238 | (this can be read from cypress) */ | |
239 | clock = I2C_PCF_CLK | I2C_PCF_TRNS90; | |
4a5d3030 JD |
240 | dev_info(dev, "found API UP2000 like " |
241 | "board, will probe PCF8584 " | |
242 | "later\n"); | |
1da177e4 LT |
243 | } |
244 | } | |
245 | pci_dev_put(cy693_dev); | |
246 | } | |
247 | } | |
248 | #endif | |
249 | ||
250 | /* sanity checks for mmapped I/O */ | |
251 | if (mmapped && base < 0xc8000) { | |
4a5d3030 JD |
252 | dev_err(dev, "incorrect base address (%#x) specified " |
253 | "for mmapped I/O\n", base); | |
254 | return 0; | |
1da177e4 LT |
255 | } |
256 | ||
1da177e4 LT |
257 | if (base == 0) { |
258 | base = DEFAULT_BASE; | |
259 | } | |
4a5d3030 JD |
260 | return 1; |
261 | } | |
1da177e4 | 262 | |
0b255e92 | 263 | static int elektor_probe(struct device *dev, unsigned int id) |
4a5d3030 | 264 | { |
1da177e4 LT |
265 | init_waitqueue_head(&pcf_wait); |
266 | if (pcf_isa_init()) | |
267 | return -ENODEV; | |
4a5d3030 | 268 | pcf_isa_ops.dev.parent = dev; |
1da177e4 LT |
269 | if (i2c_pcf_add_bus(&pcf_isa_ops) < 0) |
270 | goto fail; | |
fe3d6a99 | 271 | |
4a5d3030 | 272 | dev_info(dev, "found device at %#x\n", base); |
1da177e4 LT |
273 | |
274 | return 0; | |
275 | ||
276 | fail: | |
277 | if (irq > 0) { | |
278 | disable_irq(irq); | |
279 | free_irq(irq, NULL); | |
280 | } | |
281 | ||
3634ff6a ST |
282 | if (!mmapped) { |
283 | ioport_unmap(base_iomem); | |
fe3d6a99 | 284 | release_region(base, 2); |
3634ff6a ST |
285 | } else { |
286 | iounmap(base_iomem); | |
287 | release_mem_region(base, 2); | |
288 | } | |
1da177e4 LT |
289 | return -ENODEV; |
290 | } | |
291 | ||
0b255e92 | 292 | static int elektor_remove(struct device *dev, unsigned int id) |
1da177e4 | 293 | { |
3269711b | 294 | i2c_del_adapter(&pcf_isa_ops); |
1da177e4 LT |
295 | |
296 | if (irq > 0) { | |
297 | disable_irq(irq); | |
298 | free_irq(irq, NULL); | |
299 | } | |
300 | ||
3634ff6a ST |
301 | if (!mmapped) { |
302 | ioport_unmap(base_iomem); | |
fe3d6a99 | 303 | release_region(base, 2); |
3634ff6a ST |
304 | } else { |
305 | iounmap(base_iomem); | |
306 | release_mem_region(base, 2); | |
307 | } | |
4a5d3030 JD |
308 | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static struct isa_driver i2c_elektor_driver = { | |
313 | .match = elektor_match, | |
314 | .probe = elektor_probe, | |
0b255e92 | 315 | .remove = elektor_remove, |
4a5d3030 JD |
316 | .driver = { |
317 | .owner = THIS_MODULE, | |
318 | .name = "i2c-elektor", | |
319 | }, | |
320 | }; | |
321 | ||
322 | static int __init i2c_pcfisa_init(void) | |
323 | { | |
324 | return isa_register_driver(&i2c_elektor_driver, 1); | |
325 | } | |
326 | ||
327 | static void __exit i2c_pcfisa_exit(void) | |
328 | { | |
329 | isa_unregister_driver(&i2c_elektor_driver); | |
1da177e4 LT |
330 | } |
331 | ||
332 | MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>"); | |
333 | MODULE_DESCRIPTION("I2C-Bus adapter routines for PCF8584 ISA bus adapter"); | |
334 | MODULE_LICENSE("GPL"); | |
335 | ||
336 | module_param(base, int, 0); | |
337 | module_param(irq, int, 0); | |
338 | module_param(clock, int, 0); | |
339 | module_param(own, int, 0); | |
340 | module_param(mmapped, int, 0); | |
341 | ||
342 | module_init(i2c_pcfisa_init); | |
343 | module_exit(i2c_pcfisa_exit); |