[PATCH] ioremap balanced with iounmap for drivers/pcmcia
[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/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         struct resource         iomem;
71 };
72
73 #define POLL_INTERVAL           (2 * HZ)
74
75 #define SZ_2K                   (2 * SZ_1K)
76
77 /*--------------------------------------------------------------------------*/
78
79 static 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 */
85 static 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  */
105 static irqreturn_t omap_cf_irq(int irq, void *_cf)
106 {
107         omap_cf_timer((unsigned long)_cf);
108         return IRQ_HANDLED;
109 }
110
111 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
112 {
113         if (!sp)
114                 return -EINVAL;
115
116         /* NOTE CF is always 3VCARD */
117         if (omap_cf_present()) {
118                 struct omap_cf_socket   *cf;
119
120                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
121                 cf = container_of(s, struct omap_cf_socket, socket);
122                 s->irq.AssignedIRQ = 0;
123                 s->pci_irq = cf->irq;
124         } else
125                 *sp = 0;
126         return 0;
127 }
128
129 static int
130 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
131 {
132         u16             control;
133
134         /* REVISIT some non-OSK boards may support power switching */
135         switch (s->Vcc) {
136         case 0:
137         case 33:
138                 break;
139         default:
140                 return -EINVAL;
141         }
142
143         control = CF_CONTROL_REG;
144         if (s->flags & SS_RESET)
145                 CF_CONTROL_REG = CF_CONTROL_RESET;
146         else
147                 CF_CONTROL_REG = 0;
148
149         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
150                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
151
152         return 0;
153 }
154
155 static int omap_cf_ss_suspend(struct pcmcia_socket *s)
156 {
157         pr_debug("%s: %s\n", driver_name, __FUNCTION__);
158         return omap_cf_set_socket(s, &dead_socket);
159 }
160
161 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
162
163 static int
164 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
165 {
166         struct omap_cf_socket   *cf;
167
168         cf = container_of(s, struct omap_cf_socket, socket);
169         io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
170         io->start = cf->phys_cf + SZ_4K;
171         io->stop = io->start + SZ_2K - 1;
172         return 0;
173 }
174
175 static int
176 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
177 {
178         struct omap_cf_socket   *cf;
179
180         if (map->card_start)
181                 return -EINVAL;
182         cf = container_of(s, struct omap_cf_socket, socket);
183         map->static_start = cf->phys_cf;
184         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
185         if (map->flags & MAP_ATTRIB)
186                 map->static_start += SZ_2K;
187         return 0;
188 }
189
190 static struct pccard_operations omap_cf_ops = {
191         .init                   = omap_cf_ss_init,
192         .suspend                = omap_cf_ss_suspend,
193         .get_status             = omap_cf_get_status,
194         .set_socket             = omap_cf_set_socket,
195         .set_io_map             = omap_cf_set_io_map,
196         .set_mem_map            = omap_cf_set_mem_map,
197 };
198
199 /*--------------------------------------------------------------------------*/
200
201 /*
202  * NOTE:  right now the only board-specific platform_data is
203  * "what chipselect is used".  Boards could want more.
204  */
205
206 static int __devinit omap_cf_probe(struct device *dev)
207 {
208         unsigned                seg;
209         struct omap_cf_socket   *cf;
210         struct platform_device  *pdev = to_platform_device(dev);
211         int                     irq;
212         int                     status;
213
214         seg = (int) dev->platform_data;
215         if (seg == 0 || seg > 3)
216                 return -ENODEV;
217
218         /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
219         irq = platform_get_irq(pdev, 0);
220         if (irq < 0)
221                 return -EINVAL;
222
223         cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
224         if (!cf)
225                 return -ENOMEM;
226         init_timer(&cf->timer);
227         cf->timer.function = omap_cf_timer;
228         cf->timer.data = (unsigned long) cf;
229
230         cf->pdev = pdev;
231         dev_set_drvdata(dev, cf);
232
233         /* this primarily just shuts up irq handling noise */
234         status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
235                         driver_name, cf);
236         if (status < 0)
237                 goto fail0;
238         cf->irq = irq;
239         cf->socket.pci_irq = irq;
240
241         switch (seg) {
242         /* NOTE: CS0 could be configured too ... */
243         case 1:
244                 cf->phys_cf = OMAP_CS1_PHYS;
245                 break;
246         case 2:
247                 cf->phys_cf = OMAP_CS2_PHYS;
248                 break;
249         case 3:
250                 cf->phys_cf = omap_cs3_phys();
251                 break;
252         default:
253                 goto  fail1;
254         }
255         cf->iomem.start = cf->phys_cf;
256         cf->iomem.end = cf->iomem.end + SZ_8K - 1;
257         cf->iomem.flags = IORESOURCE_MEM;
258
259         /* pcmcia layer only remaps "real" memory */
260         cf->socket.io_offset = (unsigned long)
261                         ioremap(cf->phys_cf + SZ_4K, SZ_2K);
262         if (!cf->socket.io_offset)
263                 goto fail1;
264
265         if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
266                 goto fail1;
267
268         /* NOTE:  CF conflicts with MMC1 */
269         omap_cfg_reg(W11_1610_CF_CD1);
270         omap_cfg_reg(P11_1610_CF_CD2);
271         omap_cfg_reg(R11_1610_CF_IOIS16);
272         omap_cfg_reg(V10_1610_CF_IREQ);
273         omap_cfg_reg(W10_1610_CF_RESET);
274
275         CF_CFG_REG = ~(1 << seg);
276
277         pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
278
279         /* NOTE:  better EMIFS setup might support more cards; but the
280          * TRM only shows how to affect regular flash signals, not their
281          * CF/PCMCIA variants...
282          */
283         pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
284                         seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
285         EMIFS_CCS(seg) = 0x0004a1b3;    /* synch mode 4 etc */
286         EMIFS_ACS(seg) = 0x00000000;    /* OE hold/setup */
287
288         /* CF uses armxor_ck, which is "always" available */
289
290         pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
291                 CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
292                 omap_cf_present() ? "present" : "(not present)");
293
294         cf->socket.owner = THIS_MODULE;
295         cf->socket.dev.dev = dev;
296         cf->socket.ops = &omap_cf_ops;
297         cf->socket.resource_ops = &pccard_static_ops;
298         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
299                                 | SS_CAP_MEM_ALIGN;
300         cf->socket.map_size = SZ_2K;
301         cf->socket.io[0].res = &cf->iomem;
302
303         status = pcmcia_register_socket(&cf->socket);
304         if (status < 0)
305                 goto fail2;
306
307         cf->active = 1;
308         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
309         return 0;
310
311 fail2:
312         release_mem_region(cf->phys_cf, SZ_8K);
313 fail1:
314         if (cf->socket.io_offset)
315                 iounmap((void __iomem *) cf->socket.io_offset);
316         free_irq(irq, cf);
317 fail0:
318         kfree(cf);
319         return status;
320 }
321
322 static int __devexit omap_cf_remove(struct device *dev)
323 {
324         struct omap_cf_socket *cf = dev_get_drvdata(dev);
325
326         cf->active = 0;
327         pcmcia_unregister_socket(&cf->socket);
328         del_timer_sync(&cf->timer);
329         iounmap((void __iomem *) cf->socket.io_offset);
330         release_mem_region(cf->phys_cf, SZ_8K);
331         free_irq(cf->irq, cf);
332         kfree(cf);
333         return 0;
334 }
335
336 static struct device_driver omap_cf_driver = {
337         .name           = (char *) driver_name,
338         .bus            = &platform_bus_type,
339         .probe          = omap_cf_probe,
340         .remove         = __devexit_p(omap_cf_remove),
341         .suspend        = pcmcia_socket_dev_suspend,
342         .resume         = pcmcia_socket_dev_resume,
343 };
344
345 static int __init omap_cf_init(void)
346 {
347         if (cpu_is_omap16xx())
348                 return driver_register(&omap_cf_driver);
349         return -ENODEV;
350 }
351
352 static void __exit omap_cf_exit(void)
353 {
354         if (cpu_is_omap16xx())
355                 driver_unregister(&omap_cf_driver);
356 }
357
358 module_init(omap_cf_init);
359 module_exit(omap_cf_exit);
360
361 MODULE_DESCRIPTION("OMAP CF Driver");
362 MODULE_LICENSE("GPL");