Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart
[linux-2.6] / drivers / pcmcia / omap_cf.c
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/platform_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/sizes.h>
26
27 #include <asm/arch/mux.h>
28 #include <asm/arch/tc.h>
29
30
31 /* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
32  * hard-wired timings to support Compact Flash memory cards; they won't work
33  * with various other devices (like WLAN adapters) without some external
34  * logic to help out.
35  *
36  * NOTE:  CF controller docs disagree with address space docs as to where
37  * CF_BASE really lives; this is a doc erratum.
38  */
39 #define CF_BASE 0xfffe2800
40
41 /* status; read after IRQ */
42 #define CF_STATUS_REG           __REG16(CF_BASE + 0x00)
43 #       define  CF_STATUS_BAD_READ      (1 << 2)
44 #       define  CF_STATUS_BAD_WRITE     (1 << 1)
45 #       define  CF_STATUS_CARD_DETECT   (1 << 0)
46
47 /* which chipselect (CS0..CS3) is used for CF (active low) */
48 #define CF_CFG_REG              __REG16(CF_BASE + 0x02)
49
50 /* card reset */
51 #define CF_CONTROL_REG          __REG16(CF_BASE + 0x04)
52 #       define  CF_CONTROL_RESET        (1 << 0)
53
54 #define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
55
56 /*--------------------------------------------------------------------------*/
57
58 static const char driver_name[] = "omap_cf";
59
60 struct omap_cf_socket {
61         struct pcmcia_socket    socket;
62
63         struct timer_list       timer;
64         unsigned                present:1;
65         unsigned                active:1;
66
67         struct platform_device  *pdev;
68         unsigned long           phys_cf;
69         u_int                   irq;
70 };
71
72 #define POLL_INTERVAL           (2 * HZ)
73
74 #define SZ_2K                   (2 * SZ_1K)
75
76 /*--------------------------------------------------------------------------*/
77
78 static int omap_cf_ss_init(struct pcmcia_socket *s)
79 {
80         return 0;
81 }
82
83 /* the timer is primarily to kick this socket's pccardd */
84 static void omap_cf_timer(unsigned long _cf)
85 {
86         struct omap_cf_socket   *cf = (void *) _cf;
87         unsigned                present = omap_cf_present();
88
89         if (present != cf->present) {
90                 cf->present = present;
91                 pr_debug("%s: card %s\n", driver_name,
92                         present ? "present" : "gone");
93                 pcmcia_parse_events(&cf->socket, SS_DETECT);
94         }
95
96         if (cf->active)
97                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
98 }
99
100 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers
101  * claim the card's IRQ.  It may also detect some card insertions, but
102  * not removals; it can't always eliminate timer irqs.
103  */
104 static irqreturn_t omap_cf_irq(int irq, void *_cf, struct pt_regs *r)
105 {
106         omap_cf_timer((unsigned long)_cf);
107         return IRQ_HANDLED;
108 }
109
110 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
111 {
112         if (!sp)
113                 return -EINVAL;
114
115         /* FIXME power management should probably be board-specific:
116          *  - 3VCARD vs XVCARD (OSK only handles 3VCARD)
117          *  - POWERON (switched on/off by set_socket)
118          */
119         if (omap_cf_present()) {
120                 struct omap_cf_socket   *cf;
121
122                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
123                 cf = container_of(s, struct omap_cf_socket, socket);
124                 s->irq.AssignedIRQ = cf->irq;
125         } else
126                 *sp = 0;
127         return 0;
128 }
129
130 static int
131 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
132 {
133         u16             control;
134
135         /* FIXME some non-OSK boards will support power switching */
136         switch (s->Vcc) {
137         case 0:
138         case 33:
139                 break;
140         default:
141                 return -EINVAL;
142         }
143
144         control = CF_CONTROL_REG;
145         if (s->flags & SS_RESET)
146                 CF_CONTROL_REG = CF_CONTROL_RESET;
147         else
148                 CF_CONTROL_REG = 0;
149
150         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
151                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
152
153         return 0;
154 }
155
156 static int omap_cf_ss_suspend(struct pcmcia_socket *s)
157 {
158         pr_debug("%s: %s\n", driver_name, __FUNCTION__);
159         return omap_cf_set_socket(s, &dead_socket);
160 }
161
162 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
163
164 static int
165 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
166 {
167         struct omap_cf_socket   *cf;
168
169         cf = container_of(s, struct omap_cf_socket, socket);
170         io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
171         io->start = cf->phys_cf + SZ_4K;
172         io->stop = io->start + SZ_2K - 1;
173         return 0;
174 }
175
176 static int
177 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
178 {
179         struct omap_cf_socket   *cf;
180
181         if (map->card_start)
182                 return -EINVAL;
183         cf = container_of(s, struct omap_cf_socket, socket);
184         map->static_start = cf->phys_cf;
185         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
186         if (map->flags & MAP_ATTRIB)
187                 map->static_start += SZ_2K;
188         return 0;
189 }
190
191 static struct pccard_operations omap_cf_ops = {
192         .init                   = omap_cf_ss_init,
193         .suspend                = omap_cf_ss_suspend,
194         .get_status             = omap_cf_get_status,
195         .set_socket             = omap_cf_set_socket,
196         .set_io_map             = omap_cf_set_io_map,
197         .set_mem_map            = omap_cf_set_mem_map,
198 };
199
200 /*--------------------------------------------------------------------------*/
201
202 /*
203  * NOTE:  right now the only board-specific platform_data is
204  * "what chipselect is used".  Boards could want more.
205  */
206
207 static int __init omap_cf_probe(struct device *dev)
208 {
209         unsigned                seg;
210         struct omap_cf_socket   *cf;
211         struct platform_device  *pdev = to_platform_device(dev);
212         int                     irq;
213         int                     status;
214
215         seg = (int) dev->platform_data;
216         if (seg == 0 || seg > 3)
217                 return -ENODEV;
218
219         /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
220         irq = platform_get_irq(pdev, 0);
221         if (irq < 0)
222                 return -EINVAL;
223
224         cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
225         if (!cf)
226                 return -ENOMEM;
227         init_timer(&cf->timer);
228         cf->timer.function = omap_cf_timer;
229         cf->timer.data = (unsigned long) cf;
230
231         cf->pdev = pdev;
232         dev_set_drvdata(dev, cf);
233
234         /* this primarily just shuts up irq handling noise */
235         status = request_irq(irq, omap_cf_irq, SA_SHIRQ,
236                         driver_name, cf);
237         if (status < 0)
238                 goto fail0;
239         cf->irq = irq;
240         cf->socket.pci_irq = irq;
241
242         switch (seg) {
243         /* NOTE: CS0 could be configured too ... */
244         case 1:
245                 cf->phys_cf = OMAP_CS1_PHYS;
246                 break;
247         case 2:
248                 cf->phys_cf = OMAP_CS2_PHYS;
249                 break;
250         case 3:
251                 cf->phys_cf = omap_cs3_phys();
252                 break;
253         default:
254                 goto  fail1;
255         }
256
257         /* pcmcia layer only remaps "real" memory */
258         cf->socket.io_offset = (unsigned long)
259                         ioremap(cf->phys_cf + SZ_4K, SZ_2K);
260         if (!cf->socket.io_offset)
261                 goto fail1;
262
263         if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
264                 goto fail1;
265
266         /* NOTE:  CF conflicts with MMC1 */
267         omap_cfg_reg(W11_1610_CF_CD1);
268         omap_cfg_reg(P11_1610_CF_CD2);
269         omap_cfg_reg(R11_1610_CF_IOIS16);
270         omap_cfg_reg(V10_1610_CF_IREQ);
271         omap_cfg_reg(W10_1610_CF_RESET);
272
273         CF_CFG_REG = ~(1 << seg);
274
275         pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
276
277         /* NOTE:  better EMIFS setup might support more cards; but the
278          * TRM only shows how to affect regular flash signals, not their
279          * CF/PCMCIA variants...
280          */
281         pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
282                         seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
283         EMIFS_CCS(seg) = 0x0004a1b3;    /* synch mode 4 etc */
284         EMIFS_ACS(seg) = 0x00000000;    /* OE hold/setup */
285
286         /* CF uses armxor_ck, which is "always" available */
287
288         pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
289                 CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
290                 omap_cf_present() ? "present" : "(not present)");
291
292         cf->socket.owner = THIS_MODULE;
293         cf->socket.dev.dev = dev;
294         cf->socket.ops = &omap_cf_ops;
295         cf->socket.resource_ops = &pccard_static_ops;
296         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
297                                 | SS_CAP_MEM_ALIGN;
298         cf->socket.map_size = SZ_2K;
299
300         status = pcmcia_register_socket(&cf->socket);
301         if (status < 0)
302                 goto fail2;
303
304         cf->active = 1;
305         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
306         return 0;
307
308 fail2:
309         iounmap((void __iomem *) cf->socket.io_offset);
310         release_mem_region(cf->phys_cf, SZ_8K);
311 fail1:
312         free_irq(irq, cf);
313 fail0:
314         kfree(cf);
315         return status;
316 }
317
318 static int __devexit omap_cf_remove(struct device *dev)
319 {
320         struct omap_cf_socket *cf = dev_get_drvdata(dev);
321
322         cf->active = 0;
323         pcmcia_unregister_socket(&cf->socket);
324         del_timer_sync(&cf->timer);
325         iounmap((void __iomem *) cf->socket.io_offset);
326         release_mem_region(cf->phys_cf, SZ_8K);
327         free_irq(cf->irq, cf);
328         kfree(cf);
329         return 0;
330 }
331
332 static struct device_driver omap_cf_driver = {
333         .name           = (char *) driver_name,
334         .bus            = &platform_bus_type,
335         .probe          = omap_cf_probe,
336         .remove         = __devexit_p(omap_cf_remove),
337         .suspend        = pcmcia_socket_dev_suspend,
338         .resume         = pcmcia_socket_dev_resume,
339 };
340
341 static int __init omap_cf_init(void)
342 {
343         if (cpu_is_omap16xx())
344                 driver_register(&omap_cf_driver);
345         return 0;
346 }
347
348 static void __exit omap_cf_exit(void)
349 {
350         if (cpu_is_omap16xx())
351                 driver_unregister(&omap_cf_driver);
352 }
353
354 module_init(omap_cf_init);
355 module_exit(omap_cf_exit);
356
357 MODULE_DESCRIPTION("OMAP CF Driver");
358 MODULE_LICENSE("GPL");