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