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
57 static const char driver_name[] = "bfin_cf_pcmcia";
58
59 struct 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 /*--------------------------------------------------------------------------*/
bfin_cf_reset(void)74 static 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
bfin_cf_ss_init(struct pcmcia_socket * s)83 static 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 */
bfin_cf_timer(unsigned long _cf)89 static 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
bfin_cf_get_status(struct pcmcia_socket * s,u_int * sp)105 static 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
124 static int
bfin_cf_set_socket(struct pcmcia_socket * sock,struct socket_state_t * s)125 bfin_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
bfin_cf_ss_suspend(struct pcmcia_socket * s)153 static 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
bfin_cf_set_io_map(struct pcmcia_socket * s,struct pccard_io_map * io)160 static 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
171 static int
bfin_cf_set_mem_map(struct pcmcia_socket * s,struct pccard_mem_map * map)172 bfin_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
187 static 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
bfin_cf_probe(struct platform_device * pdev)198 static int 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
277 fail2:
278 iounmap((void __iomem *)cf->socket.io_offset);
279 release_mem_region(cf->phys_cf_io, SZ_8K);
280
281 fail0:
282 gpio_free(cf->cd_pfx);
283 kfree(cf);
284 platform_set_drvdata(pdev, NULL);
285
286 return status;
287 }
288
bfin_cf_remove(struct platform_device * pdev)289 static int 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
304 static struct platform_driver bfin_cf_driver = {
305 .driver = {
306 .name = driver_name,
307 },
308 .probe = bfin_cf_probe,
309 .remove = bfin_cf_remove,
310 };
311
312 module_platform_driver(bfin_cf_driver);
313
314 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
315 MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
316 MODULE_LICENSE("GPL");
317