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David Brownellf74e48a2005-09-09 13:03:28 -07001/*
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>
Russell Kingd052d1b2005-10-29 19:07:23 +010015#include <linux/platform_device.h>
David Brownellf74e48a2005-09-09 13:03:28 -070016#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>
David Brownellf74e48a2005-09-09 13:03:28 -070025#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
58static const char driver_name[] = "omap_cf";
59
60struct 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
78static 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 */
84static 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 */
104static 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
110static 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
130static int
131omap_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
156static 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
164static int
165omap_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
176static int
177omap_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
191static 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
207static 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)
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
308fail2:
309 iounmap((void __iomem *) cf->socket.io_offset);
310 release_mem_region(cf->phys_cf, SZ_8K);
311fail1:
312 free_irq(irq, cf);
313fail0:
314 kfree(cf);
315 return status;
316}
317
318static 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
David Brownellf74e48a2005-09-09 13:03:28 -0700332static 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),
Russell King9480e302005-10-28 09:52:56 -0700337 .suspend = pcmcia_socket_dev_suspend,
338 .resume = pcmcia_socket_dev_resume,
David Brownellf74e48a2005-09-09 13:03:28 -0700339};
340
341static int __init omap_cf_init(void)
342{
343 if (cpu_is_omap16xx())
344 driver_register(&omap_cf_driver);
345 return 0;
346}
347
348static void __exit omap_cf_exit(void)
349{
350 if (cpu_is_omap16xx())
351 driver_unregister(&omap_cf_driver);
352}
353
354module_init(omap_cf_init);
355module_exit(omap_cf_exit);
356
357MODULE_DESCRIPTION("OMAP CF Driver");
358MODULE_LICENSE("GPL");