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 <mach/hardware.h>
23 #include <asm/io.h>
24 #include <asm/sizes.h>
25
26 #include <mach/mux.h>
27 #include <mach/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 (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 (CF_BASE + 0x02)
48
49 /* card reset */
50 #define CF_CONTROL (CF_BASE + 0x04)
51 # define CF_CONTROL_RESET (1 << 0)
52
53 #define omap_cf_present() (!(omap_readw(CF_STATUS) & 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 = omap_readw(CF_CONTROL);
143 if (s->flags & SS_RESET)
144 omap_writew(CF_CONTROL_RESET, CF_CONTROL);
145 else
146 omap_writew(0, CF_CONTROL);
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, __func__);
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 omap_writew(~(1 << seg), CF_CFG);
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, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
283 omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */
284 omap_writel(0x00000000, EMIFS_ACS(seg)); /* 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 omap_readw(CF_STATUS), omap_readw(CF_CFG),
290 omap_readw(CF_CONTROL),
291 omap_cf_present() ? "present" : "(not present)");
292
293 cf->socket.owner = THIS_MODULE;
294 cf->socket.dev.parent = &pdev->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 cf->socket.io[0].res = &cf->iomem;
301
302 status = pcmcia_register_socket(&cf->socket);
303 if (status < 0)
304 goto fail2;
305
306 cf->active = 1;
307 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
308 return 0;
309
310 fail2:
311 release_mem_region(cf->phys_cf, SZ_8K);
312 fail1:
313 if (cf->socket.io_offset)
314 iounmap((void __iomem *) cf->socket.io_offset);
315 free_irq(irq, cf);
316 fail0:
317 kfree(cf);
318 return status;
319 }
320
321 static int __exit omap_cf_remove(struct platform_device *pdev)
322 {
323 struct omap_cf_socket *cf = platform_get_drvdata(pdev);
324
325 cf->active = 0;
326 pcmcia_unregister_socket(&cf->socket);
327 del_timer_sync(&cf->timer);
328 iounmap((void __iomem *) cf->socket.io_offset);
329 release_mem_region(cf->phys_cf, SZ_8K);
330 free_irq(cf->irq, cf);
331 kfree(cf);
332 return 0;
333 }
334
335 static int omap_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
336 {
337 return pcmcia_socket_dev_suspend(&pdev->dev);
338 }
339
340 static int omap_cf_resume(struct platform_device *pdev)
341 {
342 return pcmcia_socket_dev_resume(&pdev->dev);
343 }
344
345 static struct platform_driver omap_cf_driver = {
346 .driver = {
347 .name = (char *) driver_name,
348 .owner = THIS_MODULE,
349 },
350 .remove = __exit_p(omap_cf_remove),
351 .suspend = omap_cf_suspend,
352 .resume = omap_cf_resume,
353 };
354
355 static int __init omap_cf_init(void)
356 {
357 if (cpu_is_omap16xx())
358 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
359 return -ENODEV;
360 }
361
362 static void __exit omap_cf_exit(void)
363 {
364 if (cpu_is_omap16xx())
365 platform_driver_unregister(&omap_cf_driver);
366 }
367
368 module_init(omap_cf_init);
369 module_exit(omap_cf_exit);
370
371 MODULE_DESCRIPTION("OMAP CF Driver");
372 MODULE_LICENSE("GPL");
373 MODULE_ALIAS("platform:omap_cf");
374
|
This page was automatically generated by the
LXR engine.
|