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path: root/drivers/pcmcia/omap_cf.c
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-rw-r--r--drivers/pcmcia/omap_cf.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c
new file mode 100644
index 000000000000..08d1c9288264
--- /dev/null
+++ b/drivers/pcmcia/omap_cf.c
@@ -0,0 +1,373 @@
1/*
2 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
3 *
4 * Copyright (c) 2005 David Brownell
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/device.h>
16#include <linux/errno.h>
17#include <linux/init.h>
18#include <linux/delay.h>
19#include <linux/interrupt.h>
20
21#include <pcmcia/ss.h>
22
23#include <asm/hardware.h>
24#include <asm/io.h>
25#include <asm/mach-types.h>
26#include <asm/sizes.h>
27
28#include <asm/arch/mux.h>
29#include <asm/arch/tc.h>
30
31
32/* NOTE: don't expect this to support many I/O cards. The 16xx chips have
33 * hard-wired timings to support Compact Flash memory cards; they won't work
34 * with various other devices (like WLAN adapters) without some external
35 * logic to help out.
36 *
37 * NOTE: CF controller docs disagree with address space docs as to where
38 * CF_BASE really lives; this is a doc erratum.
39 */
40#define CF_BASE 0xfffe2800
41
42/* status; read after IRQ */
43#define CF_STATUS_REG __REG16(CF_BASE + 0x00)
44# define CF_STATUS_BAD_READ (1 << 2)
45# define CF_STATUS_BAD_WRITE (1 << 1)
46# define CF_STATUS_CARD_DETECT (1 << 0)
47
48/* which chipselect (CS0..CS3) is used for CF (active low) */
49#define CF_CFG_REG __REG16(CF_BASE + 0x02)
50
51/* card reset */
52#define CF_CONTROL_REG __REG16(CF_BASE + 0x04)
53# define CF_CONTROL_RESET (1 << 0)
54
55#define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
56
57/*--------------------------------------------------------------------------*/
58
59static const char driver_name[] = "omap_cf";
60
61struct omap_cf_socket {
62 struct pcmcia_socket socket;
63
64 struct timer_list timer;
65 unsigned present:1;
66 unsigned active:1;
67
68 struct platform_device *pdev;
69 unsigned long phys_cf;
70 u_int irq;
71};
72
73#define POLL_INTERVAL (2 * HZ)
74
75#define SZ_2K (2 * SZ_1K)
76
77/*--------------------------------------------------------------------------*/
78
79static int omap_cf_ss_init(struct pcmcia_socket *s)
80{
81 return 0;
82}
83
84/* the timer is primarily to kick this socket's pccardd */
85static void omap_cf_timer(unsigned long _cf)
86{
87 struct omap_cf_socket *cf = (void *) _cf;
88 unsigned present = omap_cf_present();
89
90 if (present != cf->present) {
91 cf->present = present;
92 pr_debug("%s: card %s\n", driver_name,
93 present ? "present" : "gone");
94 pcmcia_parse_events(&cf->socket, SS_DETECT);
95 }
96
97 if (cf->active)
98 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
99}
100
101/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
102 * claim the card's IRQ. It may also detect some card insertions, but
103 * not removals; it can't always eliminate timer irqs.
104 */
105static irqreturn_t omap_cf_irq(int irq, void *_cf, struct pt_regs *r)
106{
107 omap_cf_timer((unsigned long)_cf);
108 return IRQ_HANDLED;
109}
110
111static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
112{
113 if (!sp)
114 return -EINVAL;
115
116 /* FIXME power management should probably be board-specific:
117 * - 3VCARD vs XVCARD (OSK only handles 3VCARD)
118 * - POWERON (switched on/off by set_socket)
119 */
120 if (omap_cf_present()) {
121 struct omap_cf_socket *cf;
122
123 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
124 cf = container_of(s, struct omap_cf_socket, socket);
125 s->irq.AssignedIRQ = cf->irq;
126 } else
127 *sp = 0;
128 return 0;
129}
130
131static int
132omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
133{
134 u16 control;
135
136 /* FIXME some non-OSK boards will support power switching */
137 switch (s->Vcc) {
138 case 0:
139 case 33:
140 break;
141 default:
142 return -EINVAL;
143 }
144
145 control = CF_CONTROL_REG;
146 if (s->flags & SS_RESET)
147 CF_CONTROL_REG = CF_CONTROL_RESET;
148 else
149 CF_CONTROL_REG = 0;
150
151 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
152 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
153
154 return 0;
155}
156
157static int omap_cf_ss_suspend(struct pcmcia_socket *s)
158{
159 pr_debug("%s: %s\n", driver_name, __FUNCTION__);
160 return omap_cf_set_socket(s, &dead_socket);
161}
162
163/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
164
165static int
166omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
167{
168 struct omap_cf_socket *cf;
169
170 cf = container_of(s, struct omap_cf_socket, socket);
171 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
172 io->start = cf->phys_cf + SZ_4K;
173 io->stop = io->start + SZ_2K - 1;
174 return 0;
175}
176
177static int
178omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
179{
180 struct omap_cf_socket *cf;
181
182 if (map->card_start)
183 return -EINVAL;
184 cf = container_of(s, struct omap_cf_socket, socket);
185 map->static_start = cf->phys_cf;
186 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
187 if (map->flags & MAP_ATTRIB)
188 map->static_start += SZ_2K;
189 return 0;
190}
191
192static struct pccard_operations omap_cf_ops = {
193 .init = omap_cf_ss_init,
194 .suspend = omap_cf_ss_suspend,
195 .get_status = omap_cf_get_status,
196 .set_socket = omap_cf_set_socket,
197 .set_io_map = omap_cf_set_io_map,
198 .set_mem_map = omap_cf_set_mem_map,
199};
200
201/*--------------------------------------------------------------------------*/
202
203/*
204 * NOTE: right now the only board-specific platform_data is
205 * "what chipselect is used". Boards could want more.
206 */
207
208static int __init omap_cf_probe(struct device *dev)
209{
210 unsigned seg;
211 struct omap_cf_socket *cf;
212 struct platform_device *pdev = to_platform_device(dev);
213 int irq;
214 int status;
215
216 seg = (int) dev->platform_data;
217 if (seg == 0 || seg > 3)
218 return -ENODEV;
219
220 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
221 irq = platform_get_irq(pdev, 0);
222 if (!irq)
223 return -EINVAL;
224
225 cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
226 if (!cf)
227 return -ENOMEM;
228 init_timer(&cf->timer);
229 cf->timer.function = omap_cf_timer;
230 cf->timer.data = (unsigned long) cf;
231
232 cf->pdev = pdev;
233 dev_set_drvdata(dev, cf);
234
235 /* this primarily just shuts up irq handling noise */
236 status = request_irq(irq, omap_cf_irq, SA_SHIRQ,
237 driver_name, cf);
238 if (status < 0)
239 goto fail0;
240 cf->irq = irq;
241 cf->socket.pci_irq = irq;
242
243 switch (seg) {
244 /* NOTE: CS0 could be configured too ... */
245 case 1:
246 cf->phys_cf = OMAP_CS1_PHYS;
247 break;
248 case 2:
249 cf->phys_cf = OMAP_CS2_PHYS;
250 break;
251 case 3:
252 cf->phys_cf = omap_cs3_phys();
253 break;
254 default:
255 goto fail1;
256 }
257
258 /* pcmcia layer only remaps "real" memory */
259 cf->socket.io_offset = (unsigned long)
260 ioremap(cf->phys_cf + SZ_4K, SZ_2K);
261 if (!cf->socket.io_offset)
262 goto fail1;
263
264 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
265 goto fail1;
266
267 /* NOTE: CF conflicts with MMC1 */
268 omap_cfg_reg(W11_1610_CF_CD1);
269 omap_cfg_reg(P11_1610_CF_CD2);
270 omap_cfg_reg(R11_1610_CF_IOIS16);
271 omap_cfg_reg(V10_1610_CF_IREQ);
272 omap_cfg_reg(W10_1610_CF_RESET);
273
274 CF_CFG_REG = ~(1 << seg);
275
276 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
277
278 /* NOTE: better EMIFS setup might support more cards; but the
279 * TRM only shows how to affect regular flash signals, not their
280 * CF/PCMCIA variants...
281 */
282 pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
283 seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
284 EMIFS_CCS(seg) = 0x0004a1b3; /* synch mode 4 etc */
285 EMIFS_ACS(seg) = 0x00000000; /* OE hold/setup */
286
287 /* CF uses armxor_ck, which is "always" available */
288
289 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
290 CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
291 omap_cf_present() ? "present" : "(not present)");
292
293 cf->socket.owner = THIS_MODULE;
294 cf->socket.dev.dev = dev;
295 cf->socket.ops = &omap_cf_ops;
296 cf->socket.resource_ops = &pccard_static_ops;
297 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
298 | SS_CAP_MEM_ALIGN;
299 cf->socket.map_size = SZ_2K;
300
301 status = pcmcia_register_socket(&cf->socket);
302 if (status < 0)
303 goto fail2;
304
305 cf->active = 1;
306 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
307 return 0;
308
309fail2:
310 iounmap((void __iomem *) cf->socket.io_offset);
311 release_mem_region(cf->phys_cf, SZ_8K);
312fail1:
313 free_irq(irq, cf);
314fail0:
315 kfree(cf);
316 return status;
317}
318
319static int __devexit omap_cf_remove(struct device *dev)
320{
321 struct omap_cf_socket *cf = dev_get_drvdata(dev);
322
323 cf->active = 0;
324 pcmcia_unregister_socket(&cf->socket);
325 del_timer_sync(&cf->timer);
326 iounmap((void __iomem *) cf->socket.io_offset);
327 release_mem_region(cf->phys_cf, SZ_8K);
328 free_irq(cf->irq, cf);
329 kfree(cf);
330 return 0;
331}
332
333static int omap_cf_suspend(struct device *dev, pm_message_t mesg, u32 level)
334{
335 if (level != SUSPEND_SAVE_STATE)
336 return 0;
337 return pcmcia_socket_dev_suspend(dev, mesg);
338}
339
340static int omap_cf_resume(struct device *dev, u32 level)
341{
342 if (level != RESUME_RESTORE_STATE)
343 return 0;
344 return pcmcia_socket_dev_resume(dev);
345}
346
347static struct device_driver omap_cf_driver = {
348 .name = (char *) driver_name,
349 .bus = &platform_bus_type,
350 .probe = omap_cf_probe,
351 .remove = __devexit_p(omap_cf_remove),
352 .suspend = omap_cf_suspend,
353 .resume = omap_cf_resume,
354};
355
356static int __init omap_cf_init(void)
357{
358 if (cpu_is_omap16xx())
359 driver_register(&omap_cf_driver);
360 return 0;
361}
362
363static void __exit omap_cf_exit(void)
364{
365 if (cpu_is_omap16xx())
366 driver_unregister(&omap_cf_driver);
367}
368
369module_init(omap_cf_init);
370module_exit(omap_cf_exit);
371
372MODULE_DESCRIPTION("OMAP CF Driver");
373MODULE_LICENSE("GPL");