Root/drivers/pcmcia/electra_cf.c

1/*
2 * Copyright (C) 2007 PA Semi, Inc
3 *
4 * Maintained by: Olof Johansson <olof@lixom.net>
5 *
6 * Based on drivers/pcmcia/omap_cf.c
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/module.h>
24#include <linux/kernel.h>
25#include <linux/sched.h>
26#include <linux/platform_device.h>
27#include <linux/errno.h>
28#include <linux/init.h>
29#include <linux/delay.h>
30#include <linux/interrupt.h>
31#include <linux/mm.h>
32#include <linux/vmalloc.h>
33#include <linux/of_platform.h>
34#include <linux/slab.h>
35
36#include <pcmcia/ss.h>
37
38static const char driver_name[] = "electra-cf";
39
40struct electra_cf_socket {
41    struct pcmcia_socket socket;
42
43    struct timer_list timer;
44    unsigned present:1;
45    unsigned active:1;
46
47    struct platform_device *ofdev;
48    unsigned long mem_phys;
49    void __iomem * mem_base;
50    unsigned long mem_size;
51    void __iomem * io_virt;
52    unsigned int io_base;
53    unsigned int io_size;
54    u_int irq;
55    struct resource iomem;
56    void __iomem * gpio_base;
57    int gpio_detect;
58    int gpio_vsense;
59    int gpio_3v;
60    int gpio_5v;
61};
62
63#define POLL_INTERVAL (2 * HZ)
64
65
66static int electra_cf_present(struct electra_cf_socket *cf)
67{
68    unsigned int gpio;
69
70    gpio = in_le32(cf->gpio_base+0x40);
71    return !(gpio & (1 << cf->gpio_detect));
72}
73
74static int electra_cf_ss_init(struct pcmcia_socket *s)
75{
76    return 0;
77}
78
79/* the timer is primarily to kick this socket's pccardd */
80static void electra_cf_timer(unsigned long _cf)
81{
82    struct electra_cf_socket *cf = (void *) _cf;
83    int present = electra_cf_present(cf);
84
85    if (present != cf->present) {
86        cf->present = present;
87        pcmcia_parse_events(&cf->socket, SS_DETECT);
88    }
89
90    if (cf->active)
91        mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
92}
93
94static irqreturn_t electra_cf_irq(int irq, void *_cf)
95{
96    electra_cf_timer((unsigned long)_cf);
97    return IRQ_HANDLED;
98}
99
100static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
101{
102    struct electra_cf_socket *cf;
103
104    if (!sp)
105        return -EINVAL;
106
107    cf = container_of(s, struct electra_cf_socket, socket);
108
109    /* NOTE CF is always 3VCARD */
110    if (electra_cf_present(cf)) {
111        *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
112
113        s->pci_irq = cf->irq;
114    } else
115        *sp = 0;
116    return 0;
117}
118
119static int electra_cf_set_socket(struct pcmcia_socket *sock,
120                 struct socket_state_t *s)
121{
122    unsigned int gpio;
123    unsigned int vcc;
124    struct electra_cf_socket *cf;
125
126    cf = container_of(sock, struct electra_cf_socket, socket);
127
128    /* "reset" means no power in our case */
129    vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
130
131    switch (vcc) {
132    case 0:
133        gpio = 0;
134        break;
135    case 33:
136        gpio = (1 << cf->gpio_3v);
137        break;
138    case 5:
139        gpio = (1 << cf->gpio_5v);
140        break;
141    default:
142        return -EINVAL;
143    }
144
145    gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
146    gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
147    out_le32(cf->gpio_base+0x90, gpio);
148
149    pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
150        driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
151
152    return 0;
153}
154
155static int electra_cf_set_io_map(struct pcmcia_socket *s,
156                 struct pccard_io_map *io)
157{
158    return 0;
159}
160
161static int electra_cf_set_mem_map(struct pcmcia_socket *s,
162                  struct pccard_mem_map *map)
163{
164    struct electra_cf_socket *cf;
165
166    if (map->card_start)
167        return -EINVAL;
168    cf = container_of(s, struct electra_cf_socket, socket);
169    map->static_start = cf->mem_phys;
170    map->flags &= MAP_ACTIVE|MAP_ATTRIB;
171    if (!(map->flags & MAP_ATTRIB))
172        map->static_start += 0x800;
173    return 0;
174}
175
176static struct pccard_operations electra_cf_ops = {
177    .init = electra_cf_ss_init,
178    .get_status = electra_cf_get_status,
179    .set_socket = electra_cf_set_socket,
180    .set_io_map = electra_cf_set_io_map,
181    .set_mem_map = electra_cf_set_mem_map,
182};
183
184static int __devinit electra_cf_probe(struct platform_device *ofdev)
185{
186    struct device *device = &ofdev->dev;
187    struct device_node *np = ofdev->dev.of_node;
188    struct electra_cf_socket *cf;
189    struct resource mem, io;
190    int status;
191    const unsigned int *prop;
192    int err;
193    struct vm_struct *area;
194
195    err = of_address_to_resource(np, 0, &mem);
196    if (err)
197        return -EINVAL;
198
199    err = of_address_to_resource(np, 1, &io);
200    if (err)
201        return -EINVAL;
202
203    cf = kzalloc(sizeof *cf, GFP_KERNEL);
204    if (!cf)
205        return -ENOMEM;
206
207    setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
208    cf->irq = NO_IRQ;
209
210    cf->ofdev = ofdev;
211    cf->mem_phys = mem.start;
212    cf->mem_size = PAGE_ALIGN(resource_size(&mem));
213    cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
214    cf->io_size = PAGE_ALIGN(resource_size(&io));
215
216    area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
217    if (area == NULL)
218        return -ENOMEM;
219
220    cf->io_virt = (void __iomem *)(area->addr);
221
222    cf->gpio_base = ioremap(0xfc103000, 0x1000);
223    dev_set_drvdata(device, cf);
224
225    if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
226        (__ioremap_at(io.start, cf->io_virt, cf->io_size,
227        _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)) {
228        dev_err(device, "can't ioremap ranges\n");
229        status = -ENOMEM;
230        goto fail1;
231    }
232
233
234    cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
235
236    cf->iomem.start = (unsigned long)cf->mem_base;
237    cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
238    cf->iomem.flags = IORESOURCE_MEM;
239
240    cf->irq = irq_of_parse_and_map(np, 0);
241
242    status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
243                 driver_name, cf);
244    if (status < 0) {
245        dev_err(device, "request_irq failed\n");
246        goto fail1;
247    }
248
249    cf->socket.pci_irq = cf->irq;
250
251    prop = of_get_property(np, "card-detect-gpio", NULL);
252    if (!prop)
253        goto fail1;
254    cf->gpio_detect = *prop;
255
256    prop = of_get_property(np, "card-vsense-gpio", NULL);
257    if (!prop)
258        goto fail1;
259    cf->gpio_vsense = *prop;
260
261    prop = of_get_property(np, "card-3v-gpio", NULL);
262    if (!prop)
263        goto fail1;
264    cf->gpio_3v = *prop;
265
266    prop = of_get_property(np, "card-5v-gpio", NULL);
267    if (!prop)
268        goto fail1;
269    cf->gpio_5v = *prop;
270
271    cf->socket.io_offset = cf->io_base;
272
273    /* reserve chip-select regions */
274    if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
275        status = -ENXIO;
276        dev_err(device, "Can't claim memory region\n");
277        goto fail1;
278    }
279
280    if (!request_region(cf->io_base, cf->io_size, driver_name)) {
281        status = -ENXIO;
282        dev_err(device, "Can't claim I/O region\n");
283        goto fail2;
284    }
285
286    cf->socket.owner = THIS_MODULE;
287    cf->socket.dev.parent = &ofdev->dev;
288    cf->socket.ops = &electra_cf_ops;
289    cf->socket.resource_ops = &pccard_static_ops;
290    cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
291                SS_CAP_MEM_ALIGN;
292    cf->socket.map_size = 0x800;
293
294    status = pcmcia_register_socket(&cf->socket);
295    if (status < 0) {
296        dev_err(device, "pcmcia_register_socket failed\n");
297        goto fail3;
298    }
299
300    dev_info(device, "at mem 0x%lx io 0x%llx irq %d\n",
301         cf->mem_phys, io.start, cf->irq);
302
303    cf->active = 1;
304    electra_cf_timer((unsigned long)cf);
305    return 0;
306
307fail3:
308    release_region(cf->io_base, cf->io_size);
309fail2:
310    release_mem_region(cf->mem_phys, cf->mem_size);
311fail1:
312    if (cf->irq != NO_IRQ)
313        free_irq(cf->irq, cf);
314
315    if (cf->io_virt)
316        __iounmap_at(cf->io_virt, cf->io_size);
317    if (cf->mem_base)
318        iounmap(cf->mem_base);
319    if (cf->gpio_base)
320        iounmap(cf->gpio_base);
321    device_init_wakeup(&ofdev->dev, 0);
322    kfree(cf);
323    return status;
324
325}
326
327static int __devexit electra_cf_remove(struct platform_device *ofdev)
328{
329    struct device *device = &ofdev->dev;
330    struct electra_cf_socket *cf;
331
332    cf = dev_get_drvdata(device);
333
334    cf->active = 0;
335    pcmcia_unregister_socket(&cf->socket);
336    free_irq(cf->irq, cf);
337    del_timer_sync(&cf->timer);
338
339    __iounmap_at(cf->io_virt, cf->io_size);
340    iounmap(cf->mem_base);
341    iounmap(cf->gpio_base);
342    release_mem_region(cf->mem_phys, cf->mem_size);
343    release_region(cf->io_base, cf->io_size);
344
345    kfree(cf);
346
347    return 0;
348}
349
350static const struct of_device_id electra_cf_match[] = {
351    {
352        .compatible = "electra-cf",
353    },
354    {},
355};
356MODULE_DEVICE_TABLE(of, electra_cf_match);
357
358static struct platform_driver electra_cf_driver = {
359    .driver = {
360        .name = (char *)driver_name,
361        .owner = THIS_MODULE,
362        .of_match_table = electra_cf_match,
363    },
364    .probe = electra_cf_probe,
365    .remove = electra_cf_remove,
366};
367
368module_platform_driver(electra_cf_driver);
369
370MODULE_LICENSE("GPL");
371MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
372MODULE_DESCRIPTION("PA Semi Electra CF driver");
373

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