pcmcia: fix platform driver hotplug/coldplug
[linux-2.6.git] / 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/platform_device.h>
15 #include <linux/errno.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/interrupt.h>
19
20 #include <pcmcia/ss.h>
21
22 #include <asm/hardware.h>
23 #include <asm/io.h>
24 #include <asm/sizes.h>
25
26 #include <asm/arch/mux.h>
27 #include <asm/arch/tc.h>
28
29
30 /* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
31  * hard-wired timings to support Compact Flash memory cards; they won't work
32  * with various other devices (like WLAN adapters) without some external
33  * logic to help out.
34  *
35  * NOTE:  CF controller docs disagree with address space docs as to where
36  * CF_BASE really lives; this is a doc erratum.
37  */
38 #define CF_BASE 0xfffe2800
39
40 /* status; read after IRQ */
41 #define CF_STATUS_REG           __REG16(CF_BASE + 0x00)
42 #       define  CF_STATUS_BAD_READ      (1 << 2)
43 #       define  CF_STATUS_BAD_WRITE     (1 << 1)
44 #       define  CF_STATUS_CARD_DETECT   (1 << 0)
45
46 /* which chipselect (CS0..CS3) is used for CF (active low) */
47 #define CF_CFG_REG              __REG16(CF_BASE + 0x02)
48
49 /* card reset */
50 #define CF_CONTROL_REG          __REG16(CF_BASE + 0x04)
51 #       define  CF_CONTROL_RESET        (1 << 0)
52
53 #define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
54
55 /*--------------------------------------------------------------------------*/
56
57 static const char driver_name[] = "omap_cf";
58
59 struct omap_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;
68         u_int                   irq;
69         struct resource         iomem;
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)
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         /* NOTE CF is always 3VCARD */
116         if (omap_cf_present()) {
117                 struct omap_cf_socket   *cf;
118
119                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
120                 cf = container_of(s, struct omap_cf_socket, socket);
121                 s->irq.AssignedIRQ = 0;
122                 s->pci_irq = cf->irq;
123         } else
124                 *sp = 0;
125         return 0;
126 }
127
128 static int
129 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
130 {
131         u16             control;
132
133         /* REVISIT some non-OSK boards may support power switching */
134         switch (s->Vcc) {
135         case 0:
136         case 33:
137                 break;
138         default:
139                 return -EINVAL;
140         }
141
142         control = CF_CONTROL_REG;
143         if (s->flags & SS_RESET)
144                 CF_CONTROL_REG = CF_CONTROL_RESET;
145         else
146                 CF_CONTROL_REG = 0;
147
148         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
149                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
150
151         return 0;
152 }
153
154 static int omap_cf_ss_suspend(struct pcmcia_socket *s)
155 {
156         pr_debug("%s: %s\n", driver_name, __FUNCTION__);
157         return omap_cf_set_socket(s, &dead_socket);
158 }
159
160 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
161
162 static int
163 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
164 {
165         struct omap_cf_socket   *cf;
166
167         cf = container_of(s, struct omap_cf_socket, socket);
168         io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
169         io->start = cf->phys_cf + SZ_4K;
170         io->stop = io->start + SZ_2K - 1;
171         return 0;
172 }
173
174 static int
175 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
176 {
177         struct omap_cf_socket   *cf;
178
179         if (map->card_start)
180                 return -EINVAL;
181         cf = container_of(s, struct omap_cf_socket, socket);
182         map->static_start = cf->phys_cf;
183         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
184         if (map->flags & MAP_ATTRIB)
185                 map->static_start += SZ_2K;
186         return 0;
187 }
188
189 static struct pccard_operations omap_cf_ops = {
190         .init                   = omap_cf_ss_init,
191         .suspend                = omap_cf_ss_suspend,
192         .get_status             = omap_cf_get_status,
193         .set_socket             = omap_cf_set_socket,
194         .set_io_map             = omap_cf_set_io_map,
195         .set_mem_map            = omap_cf_set_mem_map,
196 };
197
198 /*--------------------------------------------------------------------------*/
199
200 /*
201  * NOTE:  right now the only board-specific platform_data is
202  * "what chipselect is used".  Boards could want more.
203  */
204
205 static int __init omap_cf_probe(struct platform_device *pdev)
206 {
207         unsigned                seg;
208         struct omap_cf_socket   *cf;
209         int                     irq;
210         int                     status;
211
212         seg = (int) pdev->dev.platform_data;
213         if (seg == 0 || seg > 3)
214                 return -ENODEV;
215
216         /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
217         irq = platform_get_irq(pdev, 0);
218         if (irq < 0)
219                 return -EINVAL;
220
221         cf = kzalloc(sizeof *cf, GFP_KERNEL);
222         if (!cf)
223                 return -ENOMEM;
224         init_timer(&cf->timer);
225         cf->timer.function = omap_cf_timer;
226         cf->timer.data = (unsigned long) cf;
227
228         cf->pdev = pdev;
229         platform_set_drvdata(pdev, cf);
230
231         /* this primarily just shuts up irq handling noise */
232         status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
233                         driver_name, cf);
234         if (status < 0)
235                 goto fail0;
236         cf->irq = irq;
237         cf->socket.pci_irq = irq;
238
239         switch (seg) {
240         /* NOTE: CS0 could be configured too ... */
241         case 1:
242                 cf->phys_cf = OMAP_CS1_PHYS;
243                 break;
244         case 2:
245                 cf->phys_cf = OMAP_CS2_PHYS;
246                 break;
247         case 3:
248                 cf->phys_cf = omap_cs3_phys();
249                 break;
250         default:
251                 goto  fail1;
252         }
253         cf->iomem.start = cf->phys_cf;
254         cf->iomem.end = cf->iomem.end + SZ_8K - 1;
255         cf->iomem.flags = IORESOURCE_MEM;
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.parent = &pdev->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         cf->socket.io[0].res = &cf->iomem;
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
309 fail2:
310         release_mem_region(cf->phys_cf, SZ_8K);
311 fail1:
312         if (cf->socket.io_offset)
313                 iounmap((void __iomem *) cf->socket.io_offset);
314         free_irq(irq, cf);
315 fail0:
316         kfree(cf);
317         return status;
318 }
319
320 static int __exit omap_cf_remove(struct platform_device *pdev)
321 {
322         struct omap_cf_socket *cf = platform_get_drvdata(pdev);
323
324         cf->active = 0;
325         pcmcia_unregister_socket(&cf->socket);
326         del_timer_sync(&cf->timer);
327         iounmap((void __iomem *) cf->socket.io_offset);
328         release_mem_region(cf->phys_cf, SZ_8K);
329         free_irq(cf->irq, cf);
330         kfree(cf);
331         return 0;
332 }
333
334 static int omap_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
335 {
336         return pcmcia_socket_dev_suspend(&pdev->dev, mesg);
337 }
338
339 static int omap_cf_resume(struct platform_device *pdev)
340 {
341         return pcmcia_socket_dev_resume(&pdev->dev);
342 }
343
344 static struct platform_driver omap_cf_driver = {
345         .driver = {
346                 .name   = (char *) driver_name,
347                 .owner  = THIS_MODULE,
348         },
349         .remove         = __exit_p(omap_cf_remove),
350         .suspend        = omap_cf_suspend,
351         .resume         = omap_cf_resume,
352 };
353
354 static int __init omap_cf_init(void)
355 {
356         if (cpu_is_omap16xx())
357                 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
358         return -ENODEV;
359 }
360
361 static void __exit omap_cf_exit(void)
362 {
363         if (cpu_is_omap16xx())
364                 platform_driver_unregister(&omap_cf_driver);
365 }
366
367 module_init(omap_cf_init);
368 module_exit(omap_cf_exit);
369
370 MODULE_DESCRIPTION("OMAP CF Driver");
371 MODULE_LICENSE("GPL");
372 MODULE_ALIAS("platform:omap_cf");