1/*
  2 * file: drivers/pcmcia/bfin_cf.c
  3 *
  4 * based on: drivers/pcmcia/omap_cf.c
  5 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
  6 *
  7 * Copyright (c) 2005 David Brownell
  8 * Copyright (c) 2006-2008 Michael Hennerich Analog Devices Inc.
  9 *
 10 * bugs:         enter bugs at http://blackfin.uclinux.org/
 11 *
 12 * this program is free software; you can redistribute it and/or modify
 13 * it under the terms of the gnu general public license as published by
 14 * the free software foundation; either version 2, or (at your option)
 15 * any later version.
 16 *
 17 * this program is distributed in the hope that it will be useful,
 18 * but without any warranty; without even the implied warranty of
 19 * merchantability or fitness for a particular purpose.  see the
 20 * gnu general public license for more details.
 21 *
 22 * you should have received a copy of the gnu general public license
 23 * along with this program; see the file copying.
 24 * if not, write to the free software foundation,
 25 * 59 temple place - suite 330, boston, ma 02111-1307, usa.
 26 */
 27
 28#include <linux/module.h>
 29#include <linux/kernel.h>
 30#include <linux/sched.h>
 31#include <linux/platform_device.h>
 32#include <linux/errno.h>
 33#include <linux/init.h>
 34#include <linux/slab.h>
 35#include <linux/delay.h>
 36#include <linux/interrupt.h>
 37#include <linux/irq.h>
 38#include <linux/io.h>
 39
 40#include <pcmcia/ss.h>
 41#include <pcmcia/cisreg.h>
 42#include <asm/gpio.h>
 43
 44#define	SZ_1K	0x00000400
 45#define	SZ_8K	0x00002000
 46#define	SZ_2K	(2 * SZ_1K)
 47
 48#define	POLL_INTERVAL	(2 * HZ)
 49
 50#define	CF_ATASEL_ENA 	0x20311802	/* Inverts RESET */
 51#define	CF_ATASEL_DIS 	0x20311800
 52
 53#define bfin_cf_present(pfx) (gpio_get_value(pfx))
 54
 55/*--------------------------------------------------------------------------*/
 56
 57static const char driver_name[] = "bfin_cf_pcmcia";
 58
 59struct bfin_cf_socket {
 60	struct pcmcia_socket socket;
 61
 62	struct timer_list timer;
 63	unsigned present:1;
 64	unsigned active:1;
 65
 66	struct platform_device *pdev;
 67	unsigned long phys_cf_io;
 68	unsigned long phys_cf_attr;
 69	u_int irq;
 70	u_short cd_pfx;
 71};
 72
 73/*--------------------------------------------------------------------------*/
 74static int bfin_cf_reset(void)
 75{
 76	outw(0, CF_ATASEL_ENA);
 77	mdelay(200);
 78	outw(0, CF_ATASEL_DIS);
 79
 80	return 0;
 81}
 82
 83static int bfin_cf_ss_init(struct pcmcia_socket *s)
 84{
 85	return 0;
 86}
 87
 88/* the timer is primarily to kick this socket's pccardd */
 89static void bfin_cf_timer(unsigned long _cf)
 90{
 91	struct bfin_cf_socket *cf = (void *)_cf;
 92	unsigned short present = bfin_cf_present(cf->cd_pfx);
 93
 94	if (present != cf->present) {
 95		cf->present = present;
 96		dev_dbg(&cf->pdev->dev, ": card %s\n",
 97			 present ? "present" : "gone");
 98		pcmcia_parse_events(&cf->socket, SS_DETECT);
 99	}
100
101	if (cf->active)
102		mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
103}
104
105static int bfin_cf_get_status(struct pcmcia_socket *s, u_int *sp)
106{
107	struct bfin_cf_socket *cf;
108
109	if (!sp)
110		return -EINVAL;
111
112	cf = container_of(s, struct bfin_cf_socket, socket);
113
114	if (bfin_cf_present(cf->cd_pfx)) {
115		*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
116		s->pcmcia_irq = 0;
117		s->pci_irq = cf->irq;
118
119	} else
120		*sp = 0;
121	return 0;
122}
123
124static int
125bfin_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
126{
127
128	struct bfin_cf_socket *cf;
129	cf = container_of(sock, struct bfin_cf_socket, socket);
130
131	switch (s->Vcc) {
132	case 0:
133	case 33:
134		break;
135	case 50:
136		break;
137	default:
138		return -EINVAL;
139	}
140
141	if (s->flags & SS_RESET) {
142		disable_irq(cf->irq);
143		bfin_cf_reset();
144		enable_irq(cf->irq);
145	}
146
147	dev_dbg(&cf->pdev->dev, ": Vcc %d, io_irq %d, flags %04x csc %04x\n",
148		 s->Vcc, s->io_irq, s->flags, s->csc_mask);
149
150	return 0;
151}
152
153static int bfin_cf_ss_suspend(struct pcmcia_socket *s)
154{
155	return bfin_cf_set_socket(s, &dead_socket);
156}
157
158/* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
159
160static int bfin_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
161{
162	struct bfin_cf_socket *cf;
163
164	cf = container_of(s, struct bfin_cf_socket, socket);
165	io->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
166	io->start = cf->phys_cf_io;
167	io->stop = io->start + SZ_2K - 1;
168	return 0;
169}
170
171static int
172bfin_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
173{
174	struct bfin_cf_socket *cf;
175
176	if (map->card_start)
177		return -EINVAL;
178	cf = container_of(s, struct bfin_cf_socket, socket);
179	map->static_start = cf->phys_cf_io;
180	map->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
181	if (map->flags & MAP_ATTRIB)
182		map->static_start = cf->phys_cf_attr;
183
184	return 0;
185}
186
187static struct pccard_operations bfin_cf_ops = {
188	.init = bfin_cf_ss_init,
189	.suspend = bfin_cf_ss_suspend,
190	.get_status = bfin_cf_get_status,
191	.set_socket = bfin_cf_set_socket,
192	.set_io_map = bfin_cf_set_io_map,
193	.set_mem_map = bfin_cf_set_mem_map,
194};
195
196/*--------------------------------------------------------------------------*/
197
198static int __devinit bfin_cf_probe(struct platform_device *pdev)
199{
200	struct bfin_cf_socket *cf;
201	struct resource *io_mem, *attr_mem;
202	int irq;
203	unsigned short cd_pfx;
204	int status = 0;
205
206	dev_info(&pdev->dev, "Blackfin CompactFlash/PCMCIA Socket Driver\n");
207
208	irq = platform_get_irq(pdev, 0);
209	if (irq <= 0)
210		return -EINVAL;
211
212	cd_pfx = platform_get_irq(pdev, 1);	/*Card Detect GPIO PIN */
213
214	if (gpio_request(cd_pfx, "pcmcia: CD")) {
215		dev_err(&pdev->dev,
216		       "Failed ro request Card Detect GPIO_%d\n",
217		       cd_pfx);
218		return -EBUSY;
219	}
220	gpio_direction_input(cd_pfx);
221
222	cf = kzalloc(sizeof *cf, GFP_KERNEL);
223	if (!cf) {
224		gpio_free(cd_pfx);
225		return -ENOMEM;
226	}
227
228	cf->cd_pfx = cd_pfx;
229
230	setup_timer(&cf->timer, bfin_cf_timer, (unsigned long)cf);
231
232	cf->pdev = pdev;
233	platform_set_drvdata(pdev, cf);
234
235	cf->irq = irq;
236	cf->socket.pci_irq = irq;
237
238	irq_set_irq_type(irq, IRQF_TRIGGER_LOW);
239
240	io_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
241	attr_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
242
243	if (!io_mem || !attr_mem)
244		goto fail0;
245
246	cf->phys_cf_io = io_mem->start;
247	cf->phys_cf_attr = attr_mem->start;
248
249	/* pcmcia layer only remaps "real" memory */
250	cf->socket.io_offset = (unsigned long)
251	    ioremap(cf->phys_cf_io, SZ_2K);
252
253	if (!cf->socket.io_offset)
254		goto fail0;
255
256	dev_err(&pdev->dev, ": on irq %d\n", irq);
257
258	dev_dbg(&pdev->dev, ": %s\n",
259		 bfin_cf_present(cf->cd_pfx) ? "present" : "(not present)");
260
261	cf->socket.owner = THIS_MODULE;
262	cf->socket.dev.parent = &pdev->dev;
263	cf->socket.ops = &bfin_cf_ops;
264	cf->socket.resource_ops = &pccard_static_ops;
265	cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
266	    | SS_CAP_MEM_ALIGN;
267	cf->socket.map_size = SZ_2K;
268
269	status = pcmcia_register_socket(&cf->socket);
270	if (status < 0)
271		goto fail2;
272
273	cf->active = 1;
274	mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
275	return 0;
276
277fail2:
278	iounmap((void __iomem *)cf->socket.io_offset);
279	release_mem_region(cf->phys_cf_io, SZ_8K);
280
281fail0:
282	gpio_free(cf->cd_pfx);
283	kfree(cf);
284	platform_set_drvdata(pdev, NULL);
285
286	return status;
287}
288
289static int __devexit bfin_cf_remove(struct platform_device *pdev)
290{
291	struct bfin_cf_socket *cf = platform_get_drvdata(pdev);
292
293	gpio_free(cf->cd_pfx);
294	cf->active = 0;
295	pcmcia_unregister_socket(&cf->socket);
296	del_timer_sync(&cf->timer);
297	iounmap((void __iomem *)cf->socket.io_offset);
298	release_mem_region(cf->phys_cf_io, SZ_8K);
299	platform_set_drvdata(pdev, NULL);
300	kfree(cf);
301	return 0;
302}
303
304static struct platform_driver bfin_cf_driver = {
305	.driver = {
306		   .name = (char *)driver_name,
307		   .owner = THIS_MODULE,
308		   },
309	.probe = bfin_cf_probe,
310	.remove = __devexit_p(bfin_cf_remove),
311};
312
313static int __init bfin_cf_init(void)
314{
315	return platform_driver_register(&bfin_cf_driver);
316}
317
318static void __exit bfin_cf_exit(void)
319{
320	platform_driver_unregister(&bfin_cf_driver);
321}
322
323module_init(bfin_cf_init);
324module_exit(bfin_cf_exit);
325
326MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
327MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
328MODULE_LICENSE("GPL");