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fd534e9b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
55e331cf FF |
2 | /* |
3 | * Copyright (C) 2006, 2007 Eugene Konev <ejka@openwrt.org> | |
4 | * | |
55e331cf FF |
5 | * Parts of the VLYNQ specification can be found here: |
6 | * http://www.ti.com/litv/pdf/sprue36a | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/interrupt.h> | |
55e331cf FF |
18 | #include <linux/delay.h> |
19 | #include <linux/io.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
ca4d3e67 | 21 | #include <linux/irq.h> |
55e331cf FF |
22 | |
23 | #include <linux/vlynq.h> | |
24 | ||
25 | #define VLYNQ_CTRL_PM_ENABLE 0x80000000 | |
26 | #define VLYNQ_CTRL_CLOCK_INT 0x00008000 | |
27 | #define VLYNQ_CTRL_CLOCK_DIV(x) (((x) & 7) << 16) | |
28 | #define VLYNQ_CTRL_INT_LOCAL 0x00004000 | |
29 | #define VLYNQ_CTRL_INT_ENABLE 0x00002000 | |
30 | #define VLYNQ_CTRL_INT_VECTOR(x) (((x) & 0x1f) << 8) | |
31 | #define VLYNQ_CTRL_INT2CFG 0x00000080 | |
32 | #define VLYNQ_CTRL_RESET 0x00000001 | |
33 | ||
34 | #define VLYNQ_CTRL_CLOCK_MASK (0x7 << 16) | |
35 | ||
36 | #define VLYNQ_INT_OFFSET 0x00000014 | |
37 | #define VLYNQ_REMOTE_OFFSET 0x00000080 | |
38 | ||
39 | #define VLYNQ_STATUS_LINK 0x00000001 | |
40 | #define VLYNQ_STATUS_LERROR 0x00000080 | |
41 | #define VLYNQ_STATUS_RERROR 0x00000100 | |
42 | ||
43 | #define VINT_ENABLE 0x00000100 | |
44 | #define VINT_TYPE_EDGE 0x00000080 | |
45 | #define VINT_LEVEL_LOW 0x00000040 | |
46 | #define VINT_VECTOR(x) ((x) & 0x1f) | |
47 | #define VINT_OFFSET(irq) (8 * ((irq) % 4)) | |
48 | ||
49 | #define VLYNQ_AUTONEGO_V2 0x00010000 | |
50 | ||
51 | struct vlynq_regs { | |
52 | u32 revision; | |
53 | u32 control; | |
54 | u32 status; | |
55 | u32 int_prio; | |
56 | u32 int_status; | |
57 | u32 int_pending; | |
58 | u32 int_ptr; | |
59 | u32 tx_offset; | |
60 | struct vlynq_mapping rx_mapping[4]; | |
61 | u32 chip; | |
62 | u32 autonego; | |
63 | u32 unused[6]; | |
64 | u32 int_device[8]; | |
65 | }; | |
66 | ||
9e2db5c9 | 67 | #ifdef CONFIG_VLYNQ_DEBUG |
55e331cf FF |
68 | static void vlynq_dump_regs(struct vlynq_device *dev) |
69 | { | |
70 | int i; | |
71 | ||
72 | printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n", | |
73 | dev->local, dev->remote); | |
74 | for (i = 0; i < 32; i++) { | |
75 | printk(KERN_DEBUG "VLYNQ: local %d: %08x\n", | |
76 | i + 1, ((u32 *)dev->local)[i]); | |
77 | printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n", | |
78 | i + 1, ((u32 *)dev->remote)[i]); | |
79 | } | |
80 | } | |
81 | ||
82 | static void vlynq_dump_mem(u32 *base, int count) | |
83 | { | |
84 | int i; | |
85 | ||
86 | for (i = 0; i < (count + 3) / 4; i++) { | |
87 | if (i % 4 == 0) | |
88 | printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4); | |
89 | printk(KERN_DEBUG " 0x%08x", *(base + i)); | |
90 | } | |
91 | printk(KERN_DEBUG "\n"); | |
92 | } | |
93 | #endif | |
94 | ||
95 | /* Check the VLYNQ link status with a given device */ | |
96 | static int vlynq_linked(struct vlynq_device *dev) | |
97 | { | |
98 | int i; | |
99 | ||
100 | for (i = 0; i < 100; i++) | |
101 | if (readl(&dev->local->status) & VLYNQ_STATUS_LINK) | |
102 | return 1; | |
103 | else | |
104 | cpu_relax(); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static void vlynq_reset(struct vlynq_device *dev) | |
110 | { | |
111 | writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET, | |
112 | &dev->local->control); | |
113 | ||
114 | /* Wait for the devices to finish resetting */ | |
115 | msleep(5); | |
116 | ||
117 | /* Remove reset bit */ | |
118 | writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET, | |
119 | &dev->local->control); | |
120 | ||
121 | /* Give some time for the devices to settle */ | |
122 | msleep(5); | |
123 | } | |
124 | ||
8ec4ad2b | 125 | static void vlynq_irq_unmask(struct irq_data *d) |
55e331cf | 126 | { |
8ec4ad2b | 127 | struct vlynq_device *dev = irq_data_get_irq_chip_data(d); |
55e331cf | 128 | int virq; |
8ec4ad2b | 129 | u32 val; |
55e331cf FF |
130 | |
131 | BUG_ON(!dev); | |
8ec4ad2b | 132 | virq = d->irq - dev->irq_start; |
55e331cf FF |
133 | val = readl(&dev->remote->int_device[virq >> 2]); |
134 | val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq); | |
135 | writel(val, &dev->remote->int_device[virq >> 2]); | |
136 | } | |
137 | ||
8ec4ad2b | 138 | static void vlynq_irq_mask(struct irq_data *d) |
55e331cf | 139 | { |
8ec4ad2b | 140 | struct vlynq_device *dev = irq_data_get_irq_chip_data(d); |
55e331cf | 141 | int virq; |
8ec4ad2b | 142 | u32 val; |
55e331cf FF |
143 | |
144 | BUG_ON(!dev); | |
8ec4ad2b | 145 | virq = d->irq - dev->irq_start; |
55e331cf FF |
146 | val = readl(&dev->remote->int_device[virq >> 2]); |
147 | val &= ~(VINT_ENABLE << VINT_OFFSET(virq)); | |
148 | writel(val, &dev->remote->int_device[virq >> 2]); | |
149 | } | |
150 | ||
8ec4ad2b | 151 | static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type) |
55e331cf | 152 | { |
8ec4ad2b | 153 | struct vlynq_device *dev = irq_data_get_irq_chip_data(d); |
55e331cf | 154 | int virq; |
8ec4ad2b | 155 | u32 val; |
55e331cf FF |
156 | |
157 | BUG_ON(!dev); | |
8ec4ad2b | 158 | virq = d->irq - dev->irq_start; |
55e331cf FF |
159 | val = readl(&dev->remote->int_device[virq >> 2]); |
160 | switch (flow_type & IRQ_TYPE_SENSE_MASK) { | |
161 | case IRQ_TYPE_EDGE_RISING: | |
162 | case IRQ_TYPE_EDGE_FALLING: | |
163 | case IRQ_TYPE_EDGE_BOTH: | |
164 | val |= VINT_TYPE_EDGE << VINT_OFFSET(virq); | |
165 | val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq)); | |
166 | break; | |
167 | case IRQ_TYPE_LEVEL_HIGH: | |
168 | val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq)); | |
169 | val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq)); | |
170 | break; | |
171 | case IRQ_TYPE_LEVEL_LOW: | |
172 | val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq)); | |
173 | val |= VINT_LEVEL_LOW << VINT_OFFSET(virq); | |
174 | break; | |
175 | default: | |
176 | return -EINVAL; | |
177 | } | |
178 | writel(val, &dev->remote->int_device[virq >> 2]); | |
179 | return 0; | |
180 | } | |
181 | ||
8ec4ad2b | 182 | static void vlynq_local_ack(struct irq_data *d) |
55e331cf | 183 | { |
8ec4ad2b | 184 | struct vlynq_device *dev = irq_data_get_irq_chip_data(d); |
55e331cf FF |
185 | u32 status = readl(&dev->local->status); |
186 | ||
187 | pr_debug("%s: local status: 0x%08x\n", | |
188 | dev_name(&dev->dev), status); | |
189 | writel(status, &dev->local->status); | |
190 | } | |
191 | ||
8ec4ad2b | 192 | static void vlynq_remote_ack(struct irq_data *d) |
55e331cf | 193 | { |
8ec4ad2b | 194 | struct vlynq_device *dev = irq_data_get_irq_chip_data(d); |
55e331cf FF |
195 | u32 status = readl(&dev->remote->status); |
196 | ||
197 | pr_debug("%s: remote status: 0x%08x\n", | |
198 | dev_name(&dev->dev), status); | |
199 | writel(status, &dev->remote->status); | |
200 | } | |
201 | ||
202 | static irqreturn_t vlynq_irq(int irq, void *dev_id) | |
203 | { | |
204 | struct vlynq_device *dev = dev_id; | |
205 | u32 status; | |
206 | int virq = 0; | |
207 | ||
208 | status = readl(&dev->local->int_status); | |
209 | writel(status, &dev->local->int_status); | |
210 | ||
211 | if (unlikely(!status)) | |
212 | spurious_interrupt(); | |
213 | ||
214 | while (status) { | |
215 | if (status & 1) | |
216 | do_IRQ(dev->irq_start + virq); | |
217 | status >>= 1; | |
218 | virq++; | |
219 | } | |
220 | ||
221 | return IRQ_HANDLED; | |
222 | } | |
223 | ||
224 | static struct irq_chip vlynq_irq_chip = { | |
225 | .name = "vlynq", | |
8ec4ad2b TG |
226 | .irq_unmask = vlynq_irq_unmask, |
227 | .irq_mask = vlynq_irq_mask, | |
228 | .irq_set_type = vlynq_irq_type, | |
55e331cf FF |
229 | }; |
230 | ||
231 | static struct irq_chip vlynq_local_chip = { | |
232 | .name = "vlynq local error", | |
8ec4ad2b TG |
233 | .irq_unmask = vlynq_irq_unmask, |
234 | .irq_mask = vlynq_irq_mask, | |
235 | .irq_ack = vlynq_local_ack, | |
55e331cf FF |
236 | }; |
237 | ||
238 | static struct irq_chip vlynq_remote_chip = { | |
239 | .name = "vlynq local error", | |
8ec4ad2b TG |
240 | .irq_unmask = vlynq_irq_unmask, |
241 | .irq_mask = vlynq_irq_mask, | |
242 | .irq_ack = vlynq_remote_ack, | |
55e331cf FF |
243 | }; |
244 | ||
245 | static int vlynq_setup_irq(struct vlynq_device *dev) | |
246 | { | |
247 | u32 val; | |
248 | int i, virq; | |
249 | ||
250 | if (dev->local_irq == dev->remote_irq) { | |
251 | printk(KERN_ERR | |
252 | "%s: local vlynq irq should be different from remote\n", | |
253 | dev_name(&dev->dev)); | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
257 | /* Clear local and remote error bits */ | |
258 | writel(readl(&dev->local->status), &dev->local->status); | |
259 | writel(readl(&dev->remote->status), &dev->remote->status); | |
260 | ||
261 | /* Now setup interrupts */ | |
262 | val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq); | |
263 | val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL | | |
264 | VLYNQ_CTRL_INT2CFG; | |
265 | val |= readl(&dev->local->control); | |
266 | writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr); | |
267 | writel(val, &dev->local->control); | |
268 | ||
269 | val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq); | |
270 | val |= VLYNQ_CTRL_INT_ENABLE; | |
271 | val |= readl(&dev->remote->control); | |
272 | writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr); | |
273 | writel(val, &dev->remote->int_ptr); | |
274 | writel(val, &dev->remote->control); | |
275 | ||
276 | for (i = dev->irq_start; i <= dev->irq_end; i++) { | |
277 | virq = i - dev->irq_start; | |
278 | if (virq == dev->local_irq) { | |
8ec4ad2b | 279 | irq_set_chip_and_handler(i, &vlynq_local_chip, |
55e331cf | 280 | handle_level_irq); |
8ec4ad2b | 281 | irq_set_chip_data(i, dev); |
55e331cf | 282 | } else if (virq == dev->remote_irq) { |
8ec4ad2b | 283 | irq_set_chip_and_handler(i, &vlynq_remote_chip, |
55e331cf | 284 | handle_level_irq); |
8ec4ad2b | 285 | irq_set_chip_data(i, dev); |
55e331cf | 286 | } else { |
8ec4ad2b | 287 | irq_set_chip_and_handler(i, &vlynq_irq_chip, |
55e331cf | 288 | handle_simple_irq); |
8ec4ad2b | 289 | irq_set_chip_data(i, dev); |
55e331cf FF |
290 | writel(0, &dev->remote->int_device[virq >> 2]); |
291 | } | |
292 | } | |
293 | ||
294 | if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) { | |
295 | printk(KERN_ERR "%s: request_irq failed\n", | |
296 | dev_name(&dev->dev)); | |
297 | return -EAGAIN; | |
298 | } | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static void vlynq_device_release(struct device *dev) | |
304 | { | |
305 | struct vlynq_device *vdev = to_vlynq_device(dev); | |
306 | kfree(vdev); | |
307 | } | |
308 | ||
309 | static int vlynq_device_match(struct device *dev, | |
310 | struct device_driver *drv) | |
311 | { | |
312 | struct vlynq_device *vdev = to_vlynq_device(dev); | |
313 | struct vlynq_driver *vdrv = to_vlynq_driver(drv); | |
314 | struct vlynq_device_id *ids = vdrv->id_table; | |
315 | ||
316 | while (ids->id) { | |
317 | if (ids->id == vdev->dev_id) { | |
318 | vdev->divisor = ids->divisor; | |
319 | vlynq_set_drvdata(vdev, ids); | |
320 | printk(KERN_INFO "Driver found for VLYNQ " | |
321 | "device: %08x\n", vdev->dev_id); | |
322 | return 1; | |
323 | } | |
324 | printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver" | |
325 | " for VLYNQ device: %08x\n", ids->id, vdev->dev_id); | |
326 | ids++; | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
331 | static int vlynq_device_probe(struct device *dev) | |
332 | { | |
333 | struct vlynq_device *vdev = to_vlynq_device(dev); | |
334 | struct vlynq_driver *drv = to_vlynq_driver(dev->driver); | |
335 | struct vlynq_device_id *id = vlynq_get_drvdata(vdev); | |
336 | int result = -ENODEV; | |
337 | ||
338 | if (drv->probe) | |
339 | result = drv->probe(vdev, id); | |
340 | if (result) | |
341 | put_device(dev); | |
342 | return result; | |
343 | } | |
344 | ||
fc7a6209 | 345 | static void vlynq_device_remove(struct device *dev) |
55e331cf FF |
346 | { |
347 | struct vlynq_driver *drv = to_vlynq_driver(dev->driver); | |
348 | ||
349 | if (drv->remove) | |
350 | drv->remove(to_vlynq_device(dev)); | |
55e331cf FF |
351 | } |
352 | ||
353 | int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner) | |
354 | { | |
355 | driver->driver.name = driver->name; | |
356 | driver->driver.bus = &vlynq_bus_type; | |
357 | return driver_register(&driver->driver); | |
358 | } | |
359 | EXPORT_SYMBOL(__vlynq_register_driver); | |
360 | ||
361 | void vlynq_unregister_driver(struct vlynq_driver *driver) | |
362 | { | |
363 | driver_unregister(&driver->driver); | |
364 | } | |
365 | EXPORT_SYMBOL(vlynq_unregister_driver); | |
366 | ||
367 | /* | |
368 | * A VLYNQ remote device can clock the VLYNQ bus master | |
369 | * using a dedicated clock line. In that case, both the | |
370 | * remove device and the bus master should have the same | |
371 | * serial clock dividers configured. Iterate through the | |
372 | * 8 possible dividers until we actually link with the | |
373 | * device. | |
374 | */ | |
375 | static int __vlynq_try_remote(struct vlynq_device *dev) | |
376 | { | |
377 | int i; | |
378 | ||
379 | vlynq_reset(dev); | |
380 | for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ? | |
381 | i <= vlynq_rdiv8 : i >= vlynq_rdiv2; | |
382 | dev->dev_id ? i++ : i--) { | |
383 | ||
384 | if (!vlynq_linked(dev)) | |
385 | break; | |
386 | ||
387 | writel((readl(&dev->remote->control) & | |
388 | ~VLYNQ_CTRL_CLOCK_MASK) | | |
389 | VLYNQ_CTRL_CLOCK_INT | | |
390 | VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1), | |
391 | &dev->remote->control); | |
392 | writel((readl(&dev->local->control) | |
393 | & ~(VLYNQ_CTRL_CLOCK_INT | | |
394 | VLYNQ_CTRL_CLOCK_MASK)) | | |
395 | VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1), | |
396 | &dev->local->control); | |
397 | ||
398 | if (vlynq_linked(dev)) { | |
399 | printk(KERN_DEBUG | |
400 | "%s: using remote clock divisor %d\n", | |
401 | dev_name(&dev->dev), i - vlynq_rdiv1 + 1); | |
402 | dev->divisor = i; | |
403 | return 0; | |
404 | } else { | |
405 | vlynq_reset(dev); | |
406 | } | |
407 | } | |
408 | ||
409 | return -ENODEV; | |
410 | } | |
411 | ||
412 | /* | |
413 | * A VLYNQ remote device can be clocked by the VLYNQ bus | |
414 | * master using a dedicated clock line. In that case, only | |
415 | * the bus master configures the serial clock divider. | |
416 | * Iterate through the 8 possible dividers until we | |
417 | * actually get a link with the device. | |
418 | */ | |
419 | static int __vlynq_try_local(struct vlynq_device *dev) | |
420 | { | |
421 | int i; | |
422 | ||
423 | vlynq_reset(dev); | |
424 | ||
425 | for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ? | |
426 | i <= vlynq_ldiv8 : i >= vlynq_ldiv2; | |
427 | dev->dev_id ? i++ : i--) { | |
428 | ||
429 | writel((readl(&dev->local->control) & | |
430 | ~VLYNQ_CTRL_CLOCK_MASK) | | |
431 | VLYNQ_CTRL_CLOCK_INT | | |
432 | VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1), | |
433 | &dev->local->control); | |
434 | ||
435 | if (vlynq_linked(dev)) { | |
436 | printk(KERN_DEBUG | |
437 | "%s: using local clock divisor %d\n", | |
438 | dev_name(&dev->dev), i - vlynq_ldiv1 + 1); | |
439 | dev->divisor = i; | |
440 | return 0; | |
441 | } else { | |
442 | vlynq_reset(dev); | |
443 | } | |
444 | } | |
445 | ||
446 | return -ENODEV; | |
447 | } | |
448 | ||
449 | /* | |
450 | * When using external clocking method, serial clock | |
451 | * is supplied by an external oscillator, therefore we | |
452 | * should mask the local clock bit in the clock control | |
453 | * register for both the bus master and the remote device. | |
454 | */ | |
455 | static int __vlynq_try_external(struct vlynq_device *dev) | |
456 | { | |
457 | vlynq_reset(dev); | |
458 | if (!vlynq_linked(dev)) | |
459 | return -ENODEV; | |
460 | ||
461 | writel((readl(&dev->remote->control) & | |
462 | ~VLYNQ_CTRL_CLOCK_INT), | |
463 | &dev->remote->control); | |
464 | ||
465 | writel((readl(&dev->local->control) & | |
466 | ~VLYNQ_CTRL_CLOCK_INT), | |
467 | &dev->local->control); | |
468 | ||
469 | if (vlynq_linked(dev)) { | |
470 | printk(KERN_DEBUG "%s: using external clock\n", | |
471 | dev_name(&dev->dev)); | |
472 | dev->divisor = vlynq_div_external; | |
473 | return 0; | |
474 | } | |
475 | ||
476 | return -ENODEV; | |
477 | } | |
478 | ||
479 | static int __vlynq_enable_device(struct vlynq_device *dev) | |
480 | { | |
481 | int result; | |
482 | struct plat_vlynq_ops *ops = dev->dev.platform_data; | |
483 | ||
484 | result = ops->on(dev); | |
485 | if (result) | |
486 | return result; | |
487 | ||
488 | switch (dev->divisor) { | |
489 | case vlynq_div_external: | |
490 | case vlynq_div_auto: | |
491 | /* When the device is brought from reset it should have clock | |
492 | * generation negotiated by hardware. | |
493 | * Check which device is generating clocks and perform setup | |
494 | * accordingly */ | |
495 | if (vlynq_linked(dev) && readl(&dev->remote->control) & | |
496 | VLYNQ_CTRL_CLOCK_INT) { | |
497 | if (!__vlynq_try_remote(dev) || | |
498 | !__vlynq_try_local(dev) || | |
499 | !__vlynq_try_external(dev)) | |
500 | return 0; | |
501 | } else { | |
502 | if (!__vlynq_try_external(dev) || | |
503 | !__vlynq_try_local(dev) || | |
504 | !__vlynq_try_remote(dev)) | |
505 | return 0; | |
506 | } | |
507 | break; | |
508 | case vlynq_ldiv1: | |
509 | case vlynq_ldiv2: | |
510 | case vlynq_ldiv3: | |
511 | case vlynq_ldiv4: | |
512 | case vlynq_ldiv5: | |
513 | case vlynq_ldiv6: | |
514 | case vlynq_ldiv7: | |
515 | case vlynq_ldiv8: | |
516 | writel(VLYNQ_CTRL_CLOCK_INT | | |
517 | VLYNQ_CTRL_CLOCK_DIV(dev->divisor - | |
518 | vlynq_ldiv1), &dev->local->control); | |
519 | writel(0, &dev->remote->control); | |
520 | if (vlynq_linked(dev)) { | |
521 | printk(KERN_DEBUG | |
522 | "%s: using local clock divisor %d\n", | |
523 | dev_name(&dev->dev), | |
524 | dev->divisor - vlynq_ldiv1 + 1); | |
525 | return 0; | |
526 | } | |
527 | break; | |
528 | case vlynq_rdiv1: | |
529 | case vlynq_rdiv2: | |
530 | case vlynq_rdiv3: | |
531 | case vlynq_rdiv4: | |
532 | case vlynq_rdiv5: | |
533 | case vlynq_rdiv6: | |
534 | case vlynq_rdiv7: | |
535 | case vlynq_rdiv8: | |
536 | writel(0, &dev->local->control); | |
537 | writel(VLYNQ_CTRL_CLOCK_INT | | |
538 | VLYNQ_CTRL_CLOCK_DIV(dev->divisor - | |
539 | vlynq_rdiv1), &dev->remote->control); | |
540 | if (vlynq_linked(dev)) { | |
541 | printk(KERN_DEBUG | |
542 | "%s: using remote clock divisor %d\n", | |
543 | dev_name(&dev->dev), | |
544 | dev->divisor - vlynq_rdiv1 + 1); | |
545 | return 0; | |
546 | } | |
547 | break; | |
548 | } | |
549 | ||
550 | ops->off(dev); | |
551 | return -ENODEV; | |
552 | } | |
553 | ||
554 | int vlynq_enable_device(struct vlynq_device *dev) | |
555 | { | |
556 | struct plat_vlynq_ops *ops = dev->dev.platform_data; | |
557 | int result = -ENODEV; | |
558 | ||
559 | result = __vlynq_enable_device(dev); | |
560 | if (result) | |
561 | return result; | |
562 | ||
563 | result = vlynq_setup_irq(dev); | |
564 | if (result) | |
565 | ops->off(dev); | |
566 | ||
567 | dev->enabled = !result; | |
568 | return result; | |
569 | } | |
570 | EXPORT_SYMBOL(vlynq_enable_device); | |
571 | ||
572 | ||
573 | void vlynq_disable_device(struct vlynq_device *dev) | |
574 | { | |
575 | struct plat_vlynq_ops *ops = dev->dev.platform_data; | |
576 | ||
577 | dev->enabled = 0; | |
578 | free_irq(dev->irq, dev); | |
579 | ops->off(dev); | |
580 | } | |
581 | EXPORT_SYMBOL(vlynq_disable_device); | |
582 | ||
583 | int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset, | |
584 | struct vlynq_mapping *mapping) | |
585 | { | |
586 | int i; | |
587 | ||
588 | if (!dev->enabled) | |
589 | return -ENXIO; | |
590 | ||
591 | writel(tx_offset, &dev->local->tx_offset); | |
592 | for (i = 0; i < 4; i++) { | |
593 | writel(mapping[i].offset, &dev->local->rx_mapping[i].offset); | |
594 | writel(mapping[i].size, &dev->local->rx_mapping[i].size); | |
595 | } | |
596 | return 0; | |
597 | } | |
598 | EXPORT_SYMBOL(vlynq_set_local_mapping); | |
599 | ||
600 | int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset, | |
601 | struct vlynq_mapping *mapping) | |
602 | { | |
603 | int i; | |
604 | ||
605 | if (!dev->enabled) | |
606 | return -ENXIO; | |
607 | ||
608 | writel(tx_offset, &dev->remote->tx_offset); | |
609 | for (i = 0; i < 4; i++) { | |
610 | writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset); | |
611 | writel(mapping[i].size, &dev->remote->rx_mapping[i].size); | |
612 | } | |
613 | return 0; | |
614 | } | |
615 | EXPORT_SYMBOL(vlynq_set_remote_mapping); | |
616 | ||
617 | int vlynq_set_local_irq(struct vlynq_device *dev, int virq) | |
618 | { | |
619 | int irq = dev->irq_start + virq; | |
620 | if (dev->enabled) | |
621 | return -EBUSY; | |
622 | ||
623 | if ((irq < dev->irq_start) || (irq > dev->irq_end)) | |
624 | return -EINVAL; | |
625 | ||
626 | if (virq == dev->remote_irq) | |
627 | return -EINVAL; | |
628 | ||
629 | dev->local_irq = virq; | |
630 | ||
631 | return 0; | |
632 | } | |
633 | EXPORT_SYMBOL(vlynq_set_local_irq); | |
634 | ||
635 | int vlynq_set_remote_irq(struct vlynq_device *dev, int virq) | |
636 | { | |
637 | int irq = dev->irq_start + virq; | |
638 | if (dev->enabled) | |
639 | return -EBUSY; | |
640 | ||
641 | if ((irq < dev->irq_start) || (irq > dev->irq_end)) | |
642 | return -EINVAL; | |
643 | ||
644 | if (virq == dev->local_irq) | |
645 | return -EINVAL; | |
646 | ||
647 | dev->remote_irq = virq; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | EXPORT_SYMBOL(vlynq_set_remote_irq); | |
652 | ||
653 | static int vlynq_probe(struct platform_device *pdev) | |
654 | { | |
655 | struct vlynq_device *dev; | |
656 | struct resource *regs_res, *mem_res, *irq_res; | |
657 | int len, result; | |
658 | ||
659 | regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs"); | |
660 | if (!regs_res) | |
661 | return -ENODEV; | |
662 | ||
663 | mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem"); | |
664 | if (!mem_res) | |
665 | return -ENODEV; | |
666 | ||
667 | irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq"); | |
668 | if (!irq_res) | |
669 | return -ENODEV; | |
670 | ||
671 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
672 | if (!dev) { | |
673 | printk(KERN_ERR | |
674 | "vlynq: failed to allocate device structure\n"); | |
675 | return -ENOMEM; | |
676 | } | |
677 | ||
678 | dev->id = pdev->id; | |
679 | dev->dev.bus = &vlynq_bus_type; | |
680 | dev->dev.parent = &pdev->dev; | |
681 | dev_set_name(&dev->dev, "vlynq%d", dev->id); | |
682 | dev->dev.platform_data = pdev->dev.platform_data; | |
683 | dev->dev.release = vlynq_device_release; | |
684 | ||
685 | dev->regs_start = regs_res->start; | |
686 | dev->regs_end = regs_res->end; | |
687 | dev->mem_start = mem_res->start; | |
688 | dev->mem_end = mem_res->end; | |
689 | ||
3354f73b | 690 | len = resource_size(regs_res); |
55e331cf FF |
691 | if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) { |
692 | printk(KERN_ERR "%s: Can't request vlynq registers\n", | |
693 | dev_name(&dev->dev)); | |
694 | result = -ENXIO; | |
695 | goto fail_request; | |
696 | } | |
697 | ||
698 | dev->local = ioremap(regs_res->start, len); | |
699 | if (!dev->local) { | |
700 | printk(KERN_ERR "%s: Can't remap vlynq registers\n", | |
701 | dev_name(&dev->dev)); | |
702 | result = -ENXIO; | |
703 | goto fail_remap; | |
704 | } | |
705 | ||
706 | dev->remote = (struct vlynq_regs *)((void *)dev->local + | |
707 | VLYNQ_REMOTE_OFFSET); | |
708 | ||
709 | dev->irq = platform_get_irq_byname(pdev, "irq"); | |
710 | dev->irq_start = irq_res->start; | |
711 | dev->irq_end = irq_res->end; | |
712 | dev->local_irq = dev->irq_end - dev->irq_start; | |
713 | dev->remote_irq = dev->local_irq - 1; | |
714 | ||
715 | if (device_register(&dev->dev)) | |
716 | goto fail_register; | |
717 | platform_set_drvdata(pdev, dev); | |
718 | ||
719 | printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n", | |
720 | dev_name(&dev->dev), (void *)dev->regs_start, dev->irq, | |
721 | (void *)dev->mem_start); | |
722 | ||
723 | dev->dev_id = 0; | |
724 | dev->divisor = vlynq_div_auto; | |
725 | result = __vlynq_enable_device(dev); | |
726 | if (result == 0) { | |
727 | dev->dev_id = readl(&dev->remote->chip); | |
728 | ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev); | |
729 | } | |
730 | if (dev->dev_id) | |
731 | printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id); | |
732 | ||
733 | return 0; | |
734 | ||
735 | fail_register: | |
736 | iounmap(dev->local); | |
737 | fail_remap: | |
738 | fail_request: | |
739 | release_mem_region(regs_res->start, len); | |
740 | kfree(dev); | |
741 | return result; | |
742 | } | |
743 | ||
744 | static int vlynq_remove(struct platform_device *pdev) | |
745 | { | |
746 | struct vlynq_device *dev = platform_get_drvdata(pdev); | |
747 | ||
748 | device_unregister(&dev->dev); | |
749 | iounmap(dev->local); | |
59d42cd4 DC |
750 | release_mem_region(dev->regs_start, |
751 | dev->regs_end - dev->regs_start + 1); | |
55e331cf FF |
752 | |
753 | kfree(dev); | |
754 | ||
755 | return 0; | |
756 | } | |
757 | ||
758 | static struct platform_driver vlynq_platform_driver = { | |
759 | .driver.name = "vlynq", | |
760 | .probe = vlynq_probe, | |
6dfb6715 | 761 | .remove = vlynq_remove, |
55e331cf FF |
762 | }; |
763 | ||
764 | struct bus_type vlynq_bus_type = { | |
765 | .name = "vlynq", | |
766 | .match = vlynq_device_match, | |
767 | .probe = vlynq_device_probe, | |
768 | .remove = vlynq_device_remove, | |
769 | }; | |
770 | EXPORT_SYMBOL(vlynq_bus_type); | |
771 | ||
6dfb6715 | 772 | static int vlynq_init(void) |
55e331cf FF |
773 | { |
774 | int res = 0; | |
775 | ||
776 | res = bus_register(&vlynq_bus_type); | |
777 | if (res) | |
778 | goto fail_bus; | |
779 | ||
780 | res = platform_driver_register(&vlynq_platform_driver); | |
781 | if (res) | |
782 | goto fail_platform; | |
783 | ||
784 | return 0; | |
785 | ||
786 | fail_platform: | |
787 | bus_unregister(&vlynq_bus_type); | |
788 | fail_bus: | |
789 | return res; | |
790 | } | |
791 | ||
6dfb6715 | 792 | static void vlynq_exit(void) |
55e331cf FF |
793 | { |
794 | platform_driver_unregister(&vlynq_platform_driver); | |
795 | bus_unregister(&vlynq_bus_type); | |
796 | } | |
797 | ||
798 | module_init(vlynq_init); | |
799 | module_exit(vlynq_exit); |