Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * (incomplete) Driver for the VINO (Video In No Out) system found in SGI Indys. | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License version 2 as published by the Free Software Foundation. | |
6 | * | |
7 | * Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org> | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/wrapper.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/irq.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/videodev.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/i2c-algo-sgi.h> | |
22 | ||
23 | #include <asm/addrspace.h> | |
24 | #include <asm/system.h> | |
25 | #include <asm/bootinfo.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/paccess.h> | |
28 | #include <asm/io.h> | |
29 | #include <asm/sgi/ip22.h> | |
30 | #include <asm/sgi/hpc3.h> | |
31 | #include <asm/sgi/mc.h> | |
32 | ||
33 | #include "vino.h" | |
34 | ||
35 | /* debugging? */ | |
36 | #if 1 | |
37 | #define DEBUG(x...) printk(x); | |
38 | #else | |
39 | #define DEBUG(x...) | |
40 | #endif | |
41 | ||
42 | ||
43 | /* VINO ASIC registers */ | |
44 | struct sgi_vino *vino; | |
45 | ||
46 | static const char *vinostr = "VINO IndyCam/TV"; | |
47 | static int threshold_a = 512; | |
48 | static int threshold_b = 512; | |
49 | ||
50 | struct vino_device { | |
51 | struct video_device vdev; | |
52 | #define VINO_CHAN_A 1 | |
53 | #define VINO_CHAN_B 2 | |
54 | int chan; | |
55 | }; | |
56 | ||
57 | struct vino_client { | |
58 | struct i2c_client *driver; | |
59 | int owner; | |
60 | }; | |
61 | ||
62 | struct vino_video { | |
63 | struct vino_device chA; | |
64 | struct vino_device chB; | |
65 | ||
66 | struct vino_client decoder; | |
67 | struct vino_client camera; | |
68 | ||
69 | struct semaphore input_lock; | |
70 | ||
71 | /* Loaded into VINO descriptors to clear End Of Descriptors table | |
72 | * interupt condition */ | |
73 | unsigned long dummy_page; | |
74 | unsigned int dummy_buf[4] __attribute__((aligned(8))); | |
75 | }; | |
76 | ||
77 | static struct vino_video *Vino; | |
78 | ||
79 | unsigned i2c_vino_getctrl(void *data) | |
80 | { | |
81 | return vino->i2c_control; | |
82 | } | |
83 | ||
84 | void i2c_vino_setctrl(void *data, unsigned val) | |
85 | { | |
86 | vino->i2c_control = val; | |
87 | } | |
88 | ||
89 | unsigned i2c_vino_rdata(void *data) | |
90 | { | |
91 | return vino->i2c_data; | |
92 | } | |
93 | ||
94 | void i2c_vino_wdata(void *data, unsigned val) | |
95 | { | |
96 | vino->i2c_data = val; | |
97 | } | |
98 | ||
99 | static struct i2c_algo_sgi_data i2c_sgi_vino_data = | |
100 | { | |
101 | .getctrl = &i2c_vino_getctrl, | |
102 | .setctrl = &i2c_vino_setctrl, | |
103 | .rdata = &i2c_vino_rdata, | |
104 | .wdata = &i2c_vino_wdata, | |
105 | .xfer_timeout = 200, | |
106 | .ack_timeout = 1000, | |
107 | }; | |
108 | ||
109 | /* | |
110 | * There are two possible clients on VINO I2C bus, so we limit usage only | |
111 | * to them. | |
112 | */ | |
113 | static int i2c_vino_client_reg(struct i2c_client *client) | |
114 | { | |
115 | int res = 0; | |
116 | ||
117 | down(&Vino->input_lock); | |
118 | switch (client->driver->id) { | |
119 | case I2C_DRIVERID_SAA7191: | |
120 | if (Vino->decoder.driver) | |
121 | res = -EBUSY; | |
122 | else | |
123 | Vino->decoder.driver = client; | |
124 | break; | |
125 | case I2C_DRIVERID_INDYCAM: | |
126 | if (Vino->camera.driver) | |
127 | res = -EBUSY; | |
128 | else | |
129 | Vino->camera.driver = client; | |
130 | break; | |
131 | default: | |
132 | res = -ENODEV; | |
133 | } | |
134 | up(&Vino->input_lock); | |
135 | ||
136 | return res; | |
137 | } | |
138 | ||
139 | static int i2c_vino_client_unreg(struct i2c_client *client) | |
140 | { | |
141 | int res = 0; | |
142 | ||
143 | down(&Vino->input_lock); | |
144 | if (client == Vino->decoder.driver) { | |
145 | if (Vino->decoder.owner) | |
146 | res = -EBUSY; | |
147 | else | |
148 | Vino->decoder.driver = NULL; | |
149 | } else if (client == Vino->camera.driver) { | |
150 | if (Vino->camera.owner) | |
151 | res = -EBUSY; | |
152 | else | |
153 | Vino->camera.driver = NULL; | |
154 | } | |
155 | up(&Vino->input_lock); | |
156 | ||
157 | return res; | |
158 | } | |
159 | ||
160 | static struct i2c_adapter vino_i2c_adapter = | |
161 | { | |
162 | .name = "VINO I2C bus", | |
163 | .id = I2C_HW_SGI_VINO, | |
164 | .algo_data = &i2c_sgi_vino_data, | |
165 | .client_register = &i2c_vino_client_reg, | |
166 | .client_unregister = &i2c_vino_client_unreg, | |
167 | }; | |
168 | ||
169 | static int vino_i2c_add_bus(void) | |
170 | { | |
171 | return i2c_sgi_add_bus(&vino_i2c_adapter); | |
172 | } | |
173 | ||
174 | static int vino_i2c_del_bus(void) | |
175 | { | |
176 | return i2c_sgi_del_bus(&vino_i2c_adapter); | |
177 | } | |
178 | ||
179 | ||
180 | static void vino_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
181 | { | |
182 | } | |
183 | ||
184 | static int vino_open(struct video_device *dev, int flags) | |
185 | { | |
186 | struct vino_device *videv = (struct vino_device *)dev; | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static void vino_close(struct video_device *dev) | |
192 | { | |
193 | struct vino_device *videv = (struct vino_device *)dev; | |
194 | } | |
195 | ||
196 | static int vino_mmap(struct video_device *dev, const char *adr, | |
197 | unsigned long size) | |
198 | { | |
199 | struct vino_device *videv = (struct vino_device *)dev; | |
200 | ||
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | static int vino_ioctl(struct video_device *dev, unsigned int cmd, void *arg) | |
205 | { | |
206 | struct vino_device *videv = (struct vino_device *)dev; | |
207 | ||
208 | return -EINVAL; | |
209 | } | |
210 | ||
211 | static const struct video_device vino_device = { | |
212 | .owner = THIS_MODULE, | |
213 | .type = VID_TYPE_CAPTURE | VID_TYPE_SUBCAPTURE, | |
214 | .hardware = VID_HARDWARE_VINO, | |
215 | .name = "VINO", | |
216 | .open = vino_open, | |
217 | .close = vino_close, | |
218 | .ioctl = vino_ioctl, | |
219 | .mmap = vino_mmap, | |
220 | }; | |
221 | ||
222 | static int __init vino_init(void) | |
223 | { | |
224 | unsigned long rev; | |
225 | int i, ret = 0; | |
226 | ||
227 | /* VINO is Indy specific beast */ | |
228 | if (ip22_is_fullhouse()) | |
229 | return -ENODEV; | |
230 | ||
231 | /* | |
232 | * VINO is in the EISA address space, so the sysid register will tell | |
233 | * us if the EISA_PRESENT pin on MC has been pulled low. | |
234 | * | |
235 | * If EISA_PRESENT is not set we definitely don't have a VINO equiped | |
236 | * system. | |
237 | */ | |
238 | if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) { | |
239 | printk(KERN_ERR "VINO not found\n"); | |
240 | return -ENODEV; | |
241 | } | |
242 | ||
243 | vino = (struct sgi_vino *)ioremap(VINO_BASE, sizeof(struct sgi_vino)); | |
244 | if (!vino) | |
245 | return -EIO; | |
246 | ||
247 | /* Okay, once we know that VINO is present we'll read its revision | |
248 | * safe way. One never knows... */ | |
249 | if (get_dbe(rev, &(vino->rev_id))) { | |
250 | printk(KERN_ERR "VINO: failed to read revision register\n"); | |
251 | ret = -ENODEV; | |
252 | goto out_unmap; | |
253 | } | |
254 | if (VINO_ID_VALUE(rev) != VINO_CHIP_ID) { | |
255 | printk(KERN_ERR "VINO is not VINO (Rev/ID: 0x%04lx)\n", rev); | |
256 | ret = -ENODEV; | |
257 | goto out_unmap; | |
258 | } | |
259 | printk(KERN_INFO "VINO Rev: 0x%02lx\n", VINO_REV_NUM(rev)); | |
260 | ||
261 | Vino = (struct vino_video *) | |
262 | kmalloc(sizeof(struct vino_video), GFP_KERNEL); | |
263 | if (!Vino) { | |
264 | ret = -ENOMEM; | |
265 | goto out_unmap; | |
266 | } | |
267 | ||
268 | Vino->dummy_page = get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
269 | if (!Vino->dummy_page) { | |
270 | ret = -ENOMEM; | |
271 | goto out_free_vino; | |
272 | } | |
273 | for (i = 0; i < 4; i++) | |
274 | Vino->dummy_buf[i] = PHYSADDR(Vino->dummy_page); | |
275 | ||
276 | vino->control = 0; | |
277 | /* prevent VINO from throwing spurious interrupts */ | |
278 | vino->a.next_4_desc = PHYSADDR(Vino->dummy_buf); | |
279 | vino->b.next_4_desc = PHYSADDR(Vino->dummy_buf); | |
280 | udelay(5); | |
281 | vino->intr_status = 0; | |
282 | /* set threshold level */ | |
283 | vino->a.fifo_thres = threshold_a; | |
284 | vino->b.fifo_thres = threshold_b; | |
285 | ||
286 | init_MUTEX(&Vino->input_lock); | |
287 | ||
288 | if (request_irq(SGI_VINO_IRQ, vino_interrupt, 0, vinostr, NULL)) { | |
289 | printk(KERN_ERR "VINO: irq%02d registration failed\n", | |
290 | SGI_VINO_IRQ); | |
291 | ret = -EAGAIN; | |
292 | goto out_free_page; | |
293 | } | |
294 | ||
295 | ret = vino_i2c_add_bus(); | |
296 | if (ret) { | |
297 | printk(KERN_ERR "VINO: I2C bus registration failed\n"); | |
298 | goto out_free_irq; | |
299 | } | |
300 | ||
301 | if (video_register_device(&Vino->chA.vdev, VFL_TYPE_GRABBER, -1) < 0) { | |
302 | printk("%s, chnl %d: device registration failed.\n", | |
303 | Vino->chA.vdev.name, Vino->chA.chan); | |
304 | ret = -EINVAL; | |
305 | goto out_i2c_del_bus; | |
306 | } | |
307 | if (video_register_device(&Vino->chB.vdev, VFL_TYPE_GRABBER, -1) < 0) { | |
308 | printk("%s, chnl %d: device registration failed.\n", | |
309 | Vino->chB.vdev.name, Vino->chB.chan); | |
310 | ret = -EINVAL; | |
311 | goto out_unregister_vdev; | |
312 | } | |
313 | ||
314 | return 0; | |
315 | ||
316 | out_unregister_vdev: | |
317 | video_unregister_device(&Vino->chA.vdev); | |
318 | out_i2c_del_bus: | |
319 | vino_i2c_del_bus(); | |
320 | out_free_irq: | |
321 | free_irq(SGI_VINO_IRQ, NULL); | |
322 | out_free_page: | |
323 | free_page(Vino->dummy_page); | |
324 | out_free_vino: | |
325 | kfree(Vino); | |
326 | out_unmap: | |
327 | iounmap(vino); | |
328 | ||
329 | return ret; | |
330 | } | |
331 | ||
332 | static void __exit vino_exit(void) | |
333 | { | |
334 | video_unregister_device(&Vino->chA.vdev); | |
335 | video_unregister_device(&Vino->chB.vdev); | |
336 | vino_i2c_del_bus(); | |
337 | free_irq(SGI_VINO_IRQ, NULL); | |
338 | free_page(Vino->dummy_page); | |
339 | kfree(Vino); | |
340 | iounmap(vino); | |
341 | } | |
342 | ||
343 | module_init(vino_init); | |
344 | module_exit(vino_exit); | |
345 | ||
346 | MODULE_DESCRIPTION("Video4Linux driver for SGI Indy VINO (IndyCam)"); | |
347 | MODULE_LICENSE("GPL"); |