Root/drivers/vlynq/vlynq.c

1/*
2 * Copyright (C) 2006, 2007 Eugene Konev <ejka@openwrt.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Parts of the VLYNQ specification can be found here:
19 * http://www.ti.com/litv/pdf/sprue36a
20 */
21
22#include <linux/init.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/string.h>
26#include <linux/device.h>
27#include <linux/module.h>
28#include <linux/errno.h>
29#include <linux/platform_device.h>
30#include <linux/interrupt.h>
31#include <linux/delay.h>
32#include <linux/io.h>
33#include <linux/slab.h>
34#include <linux/irq.h>
35
36#include <linux/vlynq.h>
37
38#define VLYNQ_CTRL_PM_ENABLE 0x80000000
39#define VLYNQ_CTRL_CLOCK_INT 0x00008000
40#define VLYNQ_CTRL_CLOCK_DIV(x) (((x) & 7) << 16)
41#define VLYNQ_CTRL_INT_LOCAL 0x00004000
42#define VLYNQ_CTRL_INT_ENABLE 0x00002000
43#define VLYNQ_CTRL_INT_VECTOR(x) (((x) & 0x1f) << 8)
44#define VLYNQ_CTRL_INT2CFG 0x00000080
45#define VLYNQ_CTRL_RESET 0x00000001
46
47#define VLYNQ_CTRL_CLOCK_MASK (0x7 << 16)
48
49#define VLYNQ_INT_OFFSET 0x00000014
50#define VLYNQ_REMOTE_OFFSET 0x00000080
51
52#define VLYNQ_STATUS_LINK 0x00000001
53#define VLYNQ_STATUS_LERROR 0x00000080
54#define VLYNQ_STATUS_RERROR 0x00000100
55
56#define VINT_ENABLE 0x00000100
57#define VINT_TYPE_EDGE 0x00000080
58#define VINT_LEVEL_LOW 0x00000040
59#define VINT_VECTOR(x) ((x) & 0x1f)
60#define VINT_OFFSET(irq) (8 * ((irq) % 4))
61
62#define VLYNQ_AUTONEGO_V2 0x00010000
63
64struct vlynq_regs {
65    u32 revision;
66    u32 control;
67    u32 status;
68    u32 int_prio;
69    u32 int_status;
70    u32 int_pending;
71    u32 int_ptr;
72    u32 tx_offset;
73    struct vlynq_mapping rx_mapping[4];
74    u32 chip;
75    u32 autonego;
76    u32 unused[6];
77    u32 int_device[8];
78};
79
80#ifdef CONFIG_VLYNQ_DEBUG
81static void vlynq_dump_regs(struct vlynq_device *dev)
82{
83    int i;
84
85    printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
86            dev->local, dev->remote);
87    for (i = 0; i < 32; i++) {
88        printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
89            i + 1, ((u32 *)dev->local)[i]);
90        printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
91            i + 1, ((u32 *)dev->remote)[i]);
92    }
93}
94
95static void vlynq_dump_mem(u32 *base, int count)
96{
97    int i;
98
99    for (i = 0; i < (count + 3) / 4; i++) {
100        if (i % 4 == 0)
101            printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
102        printk(KERN_DEBUG " 0x%08x", *(base + i));
103    }
104    printk(KERN_DEBUG "\n");
105}
106#endif
107
108/* Check the VLYNQ link status with a given device */
109static int vlynq_linked(struct vlynq_device *dev)
110{
111    int i;
112
113    for (i = 0; i < 100; i++)
114        if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
115            return 1;
116        else
117            cpu_relax();
118
119    return 0;
120}
121
122static void vlynq_reset(struct vlynq_device *dev)
123{
124    writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
125            &dev->local->control);
126
127    /* Wait for the devices to finish resetting */
128    msleep(5);
129
130    /* Remove reset bit */
131    writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
132            &dev->local->control);
133
134    /* Give some time for the devices to settle */
135    msleep(5);
136}
137
138static void vlynq_irq_unmask(struct irq_data *d)
139{
140    struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
141    int virq;
142    u32 val;
143
144    BUG_ON(!dev);
145    virq = d->irq - dev->irq_start;
146    val = readl(&dev->remote->int_device[virq >> 2]);
147    val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
148    writel(val, &dev->remote->int_device[virq >> 2]);
149}
150
151static void vlynq_irq_mask(struct irq_data *d)
152{
153    struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
154    int virq;
155    u32 val;
156
157    BUG_ON(!dev);
158    virq = d->irq - dev->irq_start;
159    val = readl(&dev->remote->int_device[virq >> 2]);
160    val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
161    writel(val, &dev->remote->int_device[virq >> 2]);
162}
163
164static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type)
165{
166    struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
167    int virq;
168    u32 val;
169
170    BUG_ON(!dev);
171    virq = d->irq - dev->irq_start;
172    val = readl(&dev->remote->int_device[virq >> 2]);
173    switch (flow_type & IRQ_TYPE_SENSE_MASK) {
174    case IRQ_TYPE_EDGE_RISING:
175    case IRQ_TYPE_EDGE_FALLING:
176    case IRQ_TYPE_EDGE_BOTH:
177        val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
178        val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
179        break;
180    case IRQ_TYPE_LEVEL_HIGH:
181        val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
182        val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
183        break;
184    case IRQ_TYPE_LEVEL_LOW:
185        val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
186        val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
187        break;
188    default:
189        return -EINVAL;
190    }
191    writel(val, &dev->remote->int_device[virq >> 2]);
192    return 0;
193}
194
195static void vlynq_local_ack(struct irq_data *d)
196{
197    struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
198    u32 status = readl(&dev->local->status);
199
200    pr_debug("%s: local status: 0x%08x\n",
201               dev_name(&dev->dev), status);
202    writel(status, &dev->local->status);
203}
204
205static void vlynq_remote_ack(struct irq_data *d)
206{
207    struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
208    u32 status = readl(&dev->remote->status);
209
210    pr_debug("%s: remote status: 0x%08x\n",
211               dev_name(&dev->dev), status);
212    writel(status, &dev->remote->status);
213}
214
215static irqreturn_t vlynq_irq(int irq, void *dev_id)
216{
217    struct vlynq_device *dev = dev_id;
218    u32 status;
219    int virq = 0;
220
221    status = readl(&dev->local->int_status);
222    writel(status, &dev->local->int_status);
223
224    if (unlikely(!status))
225        spurious_interrupt();
226
227    while (status) {
228        if (status & 1)
229            do_IRQ(dev->irq_start + virq);
230        status >>= 1;
231        virq++;
232    }
233
234    return IRQ_HANDLED;
235}
236
237static struct irq_chip vlynq_irq_chip = {
238    .name = "vlynq",
239    .irq_unmask = vlynq_irq_unmask,
240    .irq_mask = vlynq_irq_mask,
241    .irq_set_type = vlynq_irq_type,
242};
243
244static struct irq_chip vlynq_local_chip = {
245    .name = "vlynq local error",
246    .irq_unmask = vlynq_irq_unmask,
247    .irq_mask = vlynq_irq_mask,
248    .irq_ack = vlynq_local_ack,
249};
250
251static struct irq_chip vlynq_remote_chip = {
252    .name = "vlynq local error",
253    .irq_unmask = vlynq_irq_unmask,
254    .irq_mask = vlynq_irq_mask,
255    .irq_ack = vlynq_remote_ack,
256};
257
258static int vlynq_setup_irq(struct vlynq_device *dev)
259{
260    u32 val;
261    int i, virq;
262
263    if (dev->local_irq == dev->remote_irq) {
264        printk(KERN_ERR
265               "%s: local vlynq irq should be different from remote\n",
266               dev_name(&dev->dev));
267        return -EINVAL;
268    }
269
270    /* Clear local and remote error bits */
271    writel(readl(&dev->local->status), &dev->local->status);
272    writel(readl(&dev->remote->status), &dev->remote->status);
273
274    /* Now setup interrupts */
275    val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
276    val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
277        VLYNQ_CTRL_INT2CFG;
278    val |= readl(&dev->local->control);
279    writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
280    writel(val, &dev->local->control);
281
282    val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
283    val |= VLYNQ_CTRL_INT_ENABLE;
284    val |= readl(&dev->remote->control);
285    writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
286    writel(val, &dev->remote->int_ptr);
287    writel(val, &dev->remote->control);
288
289    for (i = dev->irq_start; i <= dev->irq_end; i++) {
290        virq = i - dev->irq_start;
291        if (virq == dev->local_irq) {
292            irq_set_chip_and_handler(i, &vlynq_local_chip,
293                         handle_level_irq);
294            irq_set_chip_data(i, dev);
295        } else if (virq == dev->remote_irq) {
296            irq_set_chip_and_handler(i, &vlynq_remote_chip,
297                         handle_level_irq);
298            irq_set_chip_data(i, dev);
299        } else {
300            irq_set_chip_and_handler(i, &vlynq_irq_chip,
301                         handle_simple_irq);
302            irq_set_chip_data(i, dev);
303            writel(0, &dev->remote->int_device[virq >> 2]);
304        }
305    }
306
307    if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
308        printk(KERN_ERR "%s: request_irq failed\n",
309                    dev_name(&dev->dev));
310        return -EAGAIN;
311    }
312
313    return 0;
314}
315
316static void vlynq_device_release(struct device *dev)
317{
318    struct vlynq_device *vdev = to_vlynq_device(dev);
319    kfree(vdev);
320}
321
322static int vlynq_device_match(struct device *dev,
323                  struct device_driver *drv)
324{
325    struct vlynq_device *vdev = to_vlynq_device(dev);
326    struct vlynq_driver *vdrv = to_vlynq_driver(drv);
327    struct vlynq_device_id *ids = vdrv->id_table;
328
329    while (ids->id) {
330        if (ids->id == vdev->dev_id) {
331            vdev->divisor = ids->divisor;
332            vlynq_set_drvdata(vdev, ids);
333            printk(KERN_INFO "Driver found for VLYNQ "
334                "device: %08x\n", vdev->dev_id);
335            return 1;
336        }
337        printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
338            " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
339        ids++;
340    }
341    return 0;
342}
343
344static int vlynq_device_probe(struct device *dev)
345{
346    struct vlynq_device *vdev = to_vlynq_device(dev);
347    struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
348    struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
349    int result = -ENODEV;
350
351    if (drv->probe)
352        result = drv->probe(vdev, id);
353    if (result)
354        put_device(dev);
355    return result;
356}
357
358static int vlynq_device_remove(struct device *dev)
359{
360    struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
361
362    if (drv->remove)
363        drv->remove(to_vlynq_device(dev));
364
365    return 0;
366}
367
368int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
369{
370    driver->driver.name = driver->name;
371    driver->driver.bus = &vlynq_bus_type;
372    return driver_register(&driver->driver);
373}
374EXPORT_SYMBOL(__vlynq_register_driver);
375
376void vlynq_unregister_driver(struct vlynq_driver *driver)
377{
378    driver_unregister(&driver->driver);
379}
380EXPORT_SYMBOL(vlynq_unregister_driver);
381
382/*
383 * A VLYNQ remote device can clock the VLYNQ bus master
384 * using a dedicated clock line. In that case, both the
385 * remove device and the bus master should have the same
386 * serial clock dividers configured. Iterate through the
387 * 8 possible dividers until we actually link with the
388 * device.
389 */
390static int __vlynq_try_remote(struct vlynq_device *dev)
391{
392    int i;
393
394    vlynq_reset(dev);
395    for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
396            i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
397        dev->dev_id ? i++ : i--) {
398
399        if (!vlynq_linked(dev))
400            break;
401
402        writel((readl(&dev->remote->control) &
403                ~VLYNQ_CTRL_CLOCK_MASK) |
404                VLYNQ_CTRL_CLOCK_INT |
405                VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
406                &dev->remote->control);
407        writel((readl(&dev->local->control)
408                & ~(VLYNQ_CTRL_CLOCK_INT |
409                VLYNQ_CTRL_CLOCK_MASK)) |
410                VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
411                &dev->local->control);
412
413        if (vlynq_linked(dev)) {
414            printk(KERN_DEBUG
415                "%s: using remote clock divisor %d\n",
416                dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
417            dev->divisor = i;
418            return 0;
419        } else {
420            vlynq_reset(dev);
421        }
422    }
423
424    return -ENODEV;
425}
426
427/*
428 * A VLYNQ remote device can be clocked by the VLYNQ bus
429 * master using a dedicated clock line. In that case, only
430 * the bus master configures the serial clock divider.
431 * Iterate through the 8 possible dividers until we
432 * actually get a link with the device.
433 */
434static int __vlynq_try_local(struct vlynq_device *dev)
435{
436    int i;
437
438    vlynq_reset(dev);
439
440    for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
441            i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
442        dev->dev_id ? i++ : i--) {
443
444        writel((readl(&dev->local->control) &
445                ~VLYNQ_CTRL_CLOCK_MASK) |
446                VLYNQ_CTRL_CLOCK_INT |
447                VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
448                &dev->local->control);
449
450        if (vlynq_linked(dev)) {
451            printk(KERN_DEBUG
452                "%s: using local clock divisor %d\n",
453                dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
454            dev->divisor = i;
455            return 0;
456        } else {
457            vlynq_reset(dev);
458        }
459    }
460
461    return -ENODEV;
462}
463
464/*
465 * When using external clocking method, serial clock
466 * is supplied by an external oscillator, therefore we
467 * should mask the local clock bit in the clock control
468 * register for both the bus master and the remote device.
469 */
470static int __vlynq_try_external(struct vlynq_device *dev)
471{
472    vlynq_reset(dev);
473    if (!vlynq_linked(dev))
474        return -ENODEV;
475
476    writel((readl(&dev->remote->control) &
477            ~VLYNQ_CTRL_CLOCK_INT),
478            &dev->remote->control);
479
480    writel((readl(&dev->local->control) &
481            ~VLYNQ_CTRL_CLOCK_INT),
482            &dev->local->control);
483
484    if (vlynq_linked(dev)) {
485        printk(KERN_DEBUG "%s: using external clock\n",
486            dev_name(&dev->dev));
487            dev->divisor = vlynq_div_external;
488        return 0;
489    }
490
491    return -ENODEV;
492}
493
494static int __vlynq_enable_device(struct vlynq_device *dev)
495{
496    int result;
497    struct plat_vlynq_ops *ops = dev->dev.platform_data;
498
499    result = ops->on(dev);
500    if (result)
501        return result;
502
503    switch (dev->divisor) {
504    case vlynq_div_external:
505    case vlynq_div_auto:
506        /* When the device is brought from reset it should have clock
507         * generation negotiated by hardware.
508         * Check which device is generating clocks and perform setup
509         * accordingly */
510        if (vlynq_linked(dev) && readl(&dev->remote->control) &
511           VLYNQ_CTRL_CLOCK_INT) {
512            if (!__vlynq_try_remote(dev) ||
513                !__vlynq_try_local(dev) ||
514                !__vlynq_try_external(dev))
515                return 0;
516        } else {
517            if (!__vlynq_try_external(dev) ||
518                !__vlynq_try_local(dev) ||
519                !__vlynq_try_remote(dev))
520                return 0;
521        }
522        break;
523    case vlynq_ldiv1:
524    case vlynq_ldiv2:
525    case vlynq_ldiv3:
526    case vlynq_ldiv4:
527    case vlynq_ldiv5:
528    case vlynq_ldiv6:
529    case vlynq_ldiv7:
530    case vlynq_ldiv8:
531        writel(VLYNQ_CTRL_CLOCK_INT |
532            VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
533            vlynq_ldiv1), &dev->local->control);
534        writel(0, &dev->remote->control);
535        if (vlynq_linked(dev)) {
536            printk(KERN_DEBUG
537                "%s: using local clock divisor %d\n",
538                dev_name(&dev->dev),
539                dev->divisor - vlynq_ldiv1 + 1);
540            return 0;
541        }
542        break;
543    case vlynq_rdiv1:
544    case vlynq_rdiv2:
545    case vlynq_rdiv3:
546    case vlynq_rdiv4:
547    case vlynq_rdiv5:
548    case vlynq_rdiv6:
549    case vlynq_rdiv7:
550    case vlynq_rdiv8:
551        writel(0, &dev->local->control);
552        writel(VLYNQ_CTRL_CLOCK_INT |
553            VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
554            vlynq_rdiv1), &dev->remote->control);
555        if (vlynq_linked(dev)) {
556            printk(KERN_DEBUG
557                "%s: using remote clock divisor %d\n",
558                dev_name(&dev->dev),
559                dev->divisor - vlynq_rdiv1 + 1);
560            return 0;
561        }
562        break;
563    }
564
565    ops->off(dev);
566    return -ENODEV;
567}
568
569int vlynq_enable_device(struct vlynq_device *dev)
570{
571    struct plat_vlynq_ops *ops = dev->dev.platform_data;
572    int result = -ENODEV;
573
574    result = __vlynq_enable_device(dev);
575    if (result)
576        return result;
577
578    result = vlynq_setup_irq(dev);
579    if (result)
580        ops->off(dev);
581
582    dev->enabled = !result;
583    return result;
584}
585EXPORT_SYMBOL(vlynq_enable_device);
586
587
588void vlynq_disable_device(struct vlynq_device *dev)
589{
590    struct plat_vlynq_ops *ops = dev->dev.platform_data;
591
592    dev->enabled = 0;
593    free_irq(dev->irq, dev);
594    ops->off(dev);
595}
596EXPORT_SYMBOL(vlynq_disable_device);
597
598int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
599                struct vlynq_mapping *mapping)
600{
601    int i;
602
603    if (!dev->enabled)
604        return -ENXIO;
605
606    writel(tx_offset, &dev->local->tx_offset);
607    for (i = 0; i < 4; i++) {
608        writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
609        writel(mapping[i].size, &dev->local->rx_mapping[i].size);
610    }
611    return 0;
612}
613EXPORT_SYMBOL(vlynq_set_local_mapping);
614
615int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
616                 struct vlynq_mapping *mapping)
617{
618    int i;
619
620    if (!dev->enabled)
621        return -ENXIO;
622
623    writel(tx_offset, &dev->remote->tx_offset);
624    for (i = 0; i < 4; i++) {
625        writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
626        writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
627    }
628    return 0;
629}
630EXPORT_SYMBOL(vlynq_set_remote_mapping);
631
632int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
633{
634    int irq = dev->irq_start + virq;
635    if (dev->enabled)
636        return -EBUSY;
637
638    if ((irq < dev->irq_start) || (irq > dev->irq_end))
639        return -EINVAL;
640
641    if (virq == dev->remote_irq)
642        return -EINVAL;
643
644    dev->local_irq = virq;
645
646    return 0;
647}
648EXPORT_SYMBOL(vlynq_set_local_irq);
649
650int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
651{
652    int irq = dev->irq_start + virq;
653    if (dev->enabled)
654        return -EBUSY;
655
656    if ((irq < dev->irq_start) || (irq > dev->irq_end))
657        return -EINVAL;
658
659    if (virq == dev->local_irq)
660        return -EINVAL;
661
662    dev->remote_irq = virq;
663
664    return 0;
665}
666EXPORT_SYMBOL(vlynq_set_remote_irq);
667
668static int vlynq_probe(struct platform_device *pdev)
669{
670    struct vlynq_device *dev;
671    struct resource *regs_res, *mem_res, *irq_res;
672    int len, result;
673
674    regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
675    if (!regs_res)
676        return -ENODEV;
677
678    mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
679    if (!mem_res)
680        return -ENODEV;
681
682    irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
683    if (!irq_res)
684        return -ENODEV;
685
686    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
687    if (!dev) {
688        printk(KERN_ERR
689               "vlynq: failed to allocate device structure\n");
690        return -ENOMEM;
691    }
692
693    dev->id = pdev->id;
694    dev->dev.bus = &vlynq_bus_type;
695    dev->dev.parent = &pdev->dev;
696    dev_set_name(&dev->dev, "vlynq%d", dev->id);
697    dev->dev.platform_data = pdev->dev.platform_data;
698    dev->dev.release = vlynq_device_release;
699
700    dev->regs_start = regs_res->start;
701    dev->regs_end = regs_res->end;
702    dev->mem_start = mem_res->start;
703    dev->mem_end = mem_res->end;
704
705    len = resource_size(regs_res);
706    if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
707        printk(KERN_ERR "%s: Can't request vlynq registers\n",
708               dev_name(&dev->dev));
709        result = -ENXIO;
710        goto fail_request;
711    }
712
713    dev->local = ioremap(regs_res->start, len);
714    if (!dev->local) {
715        printk(KERN_ERR "%s: Can't remap vlynq registers\n",
716               dev_name(&dev->dev));
717        result = -ENXIO;
718        goto fail_remap;
719    }
720
721    dev->remote = (struct vlynq_regs *)((void *)dev->local +
722                        VLYNQ_REMOTE_OFFSET);
723
724    dev->irq = platform_get_irq_byname(pdev, "irq");
725    dev->irq_start = irq_res->start;
726    dev->irq_end = irq_res->end;
727    dev->local_irq = dev->irq_end - dev->irq_start;
728    dev->remote_irq = dev->local_irq - 1;
729
730    if (device_register(&dev->dev))
731        goto fail_register;
732    platform_set_drvdata(pdev, dev);
733
734    printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
735           dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
736           (void *)dev->mem_start);
737
738    dev->dev_id = 0;
739    dev->divisor = vlynq_div_auto;
740    result = __vlynq_enable_device(dev);
741    if (result == 0) {
742        dev->dev_id = readl(&dev->remote->chip);
743        ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
744    }
745    if (dev->dev_id)
746        printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
747
748    return 0;
749
750fail_register:
751    iounmap(dev->local);
752fail_remap:
753fail_request:
754    release_mem_region(regs_res->start, len);
755    kfree(dev);
756    return result;
757}
758
759static int vlynq_remove(struct platform_device *pdev)
760{
761    struct vlynq_device *dev = platform_get_drvdata(pdev);
762
763    device_unregister(&dev->dev);
764    iounmap(dev->local);
765    release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
766
767    kfree(dev);
768
769    return 0;
770}
771
772static struct platform_driver vlynq_platform_driver = {
773    .driver.name = "vlynq",
774    .probe = vlynq_probe,
775    .remove = __devexit_p(vlynq_remove),
776};
777
778struct bus_type vlynq_bus_type = {
779    .name = "vlynq",
780    .match = vlynq_device_match,
781    .probe = vlynq_device_probe,
782    .remove = vlynq_device_remove,
783};
784EXPORT_SYMBOL(vlynq_bus_type);
785
786static int __devinit vlynq_init(void)
787{
788    int res = 0;
789
790    res = bus_register(&vlynq_bus_type);
791    if (res)
792        goto fail_bus;
793
794    res = platform_driver_register(&vlynq_platform_driver);
795    if (res)
796        goto fail_platform;
797
798    return 0;
799
800fail_platform:
801    bus_unregister(&vlynq_bus_type);
802fail_bus:
803    return res;
804}
805
806static void __devexit vlynq_exit(void)
807{
808    platform_driver_unregister(&vlynq_platform_driver);
809    bus_unregister(&vlynq_bus_type);
810}
811
812module_init(vlynq_init);
813module_exit(vlynq_exit);
814

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