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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/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/mach-types.h> | |
26 | #include <asm/sizes.h> | |
27 | ||
28 | #include <asm/arch/mux.h> | |
29 | #include <asm/arch/tc.h> | |
30 | ||
31 | ||
32 | /* NOTE: don't expect this to support many I/O cards. The 16xx chips have | |
33 | * hard-wired timings to support Compact Flash memory cards; they won't work | |
34 | * with various other devices (like WLAN adapters) without some external | |
35 | * logic to help out. | |
36 | * | |
37 | * NOTE: CF controller docs disagree with address space docs as to where | |
38 | * CF_BASE really lives; this is a doc erratum. | |
39 | */ | |
40 | #define CF_BASE 0xfffe2800 | |
41 | ||
42 | /* status; read after IRQ */ | |
43 | #define CF_STATUS_REG __REG16(CF_BASE + 0x00) | |
44 | # define CF_STATUS_BAD_READ (1 << 2) | |
45 | # define CF_STATUS_BAD_WRITE (1 << 1) | |
46 | # define CF_STATUS_CARD_DETECT (1 << 0) | |
47 | ||
48 | /* which chipselect (CS0..CS3) is used for CF (active low) */ | |
49 | #define CF_CFG_REG __REG16(CF_BASE + 0x02) | |
50 | ||
51 | /* card reset */ | |
52 | #define CF_CONTROL_REG __REG16(CF_BASE + 0x04) | |
53 | # define CF_CONTROL_RESET (1 << 0) | |
54 | ||
55 | #define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT)) | |
56 | ||
57 | /*--------------------------------------------------------------------------*/ | |
58 | ||
59 | static const char driver_name[] = "omap_cf"; | |
60 | ||
61 | struct omap_cf_socket { | |
62 | struct pcmcia_socket socket; | |
63 | ||
64 | struct timer_list timer; | |
65 | unsigned present:1; | |
66 | unsigned active:1; | |
67 | ||
68 | struct platform_device *pdev; | |
69 | unsigned long phys_cf; | |
70 | u_int irq; | |
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, struct pt_regs *r) | |
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 | /* FIXME power management should probably be board-specific: | |
117 | * - 3VCARD vs XVCARD (OSK only handles 3VCARD) | |
118 | * - POWERON (switched on/off by set_socket) | |
119 | */ | |
120 | if (omap_cf_present()) { | |
121 | struct omap_cf_socket *cf; | |
122 | ||
123 | *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD; | |
124 | cf = container_of(s, struct omap_cf_socket, socket); | |
125 | s->irq.AssignedIRQ = cf->irq; | |
126 | } else | |
127 | *sp = 0; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static int | |
132 | omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) | |
133 | { | |
134 | u16 control; | |
135 | ||
136 | /* FIXME some non-OSK boards will support power switching */ | |
137 | switch (s->Vcc) { | |
138 | case 0: | |
139 | case 33: | |
140 | break; | |
141 | default: | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | control = CF_CONTROL_REG; | |
146 | if (s->flags & SS_RESET) | |
147 | CF_CONTROL_REG = CF_CONTROL_RESET; | |
148 | else | |
149 | CF_CONTROL_REG = 0; | |
150 | ||
151 | pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", | |
152 | driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static int omap_cf_ss_suspend(struct pcmcia_socket *s) | |
158 | { | |
159 | pr_debug("%s: %s\n", driver_name, __FUNCTION__); | |
160 | return omap_cf_set_socket(s, &dead_socket); | |
161 | } | |
162 | ||
163 | /* regions are 2K each: mem, attrib, io (and reserved-for-ide) */ | |
164 | ||
165 | static int | |
166 | omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) | |
167 | { | |
168 | struct omap_cf_socket *cf; | |
169 | ||
170 | cf = container_of(s, struct omap_cf_socket, socket); | |
171 | io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; | |
172 | io->start = cf->phys_cf + SZ_4K; | |
173 | io->stop = io->start + SZ_2K - 1; | |
174 | return 0; | |
175 | } | |
176 | ||
177 | static int | |
178 | omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) | |
179 | { | |
180 | struct omap_cf_socket *cf; | |
181 | ||
182 | if (map->card_start) | |
183 | return -EINVAL; | |
184 | cf = container_of(s, struct omap_cf_socket, socket); | |
185 | map->static_start = cf->phys_cf; | |
186 | map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; | |
187 | if (map->flags & MAP_ATTRIB) | |
188 | map->static_start += SZ_2K; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static struct pccard_operations omap_cf_ops = { | |
193 | .init = omap_cf_ss_init, | |
194 | .suspend = omap_cf_ss_suspend, | |
195 | .get_status = omap_cf_get_status, | |
196 | .set_socket = omap_cf_set_socket, | |
197 | .set_io_map = omap_cf_set_io_map, | |
198 | .set_mem_map = omap_cf_set_mem_map, | |
199 | }; | |
200 | ||
201 | /*--------------------------------------------------------------------------*/ | |
202 | ||
203 | /* | |
204 | * NOTE: right now the only board-specific platform_data is | |
205 | * "what chipselect is used". Boards could want more. | |
206 | */ | |
207 | ||
208 | static int __init omap_cf_probe(struct device *dev) | |
209 | { | |
210 | unsigned seg; | |
211 | struct omap_cf_socket *cf; | |
212 | struct platform_device *pdev = to_platform_device(dev); | |
213 | int irq; | |
214 | int status; | |
215 | ||
216 | seg = (int) dev->platform_data; | |
217 | if (seg == 0 || seg > 3) | |
218 | return -ENODEV; | |
219 | ||
220 | /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */ | |
221 | irq = platform_get_irq(pdev, 0); | |
222 | if (!irq) | |
223 | return -EINVAL; | |
224 | ||
225 | cf = kcalloc(1, sizeof *cf, GFP_KERNEL); | |
226 | if (!cf) | |
227 | return -ENOMEM; | |
228 | init_timer(&cf->timer); | |
229 | cf->timer.function = omap_cf_timer; | |
230 | cf->timer.data = (unsigned long) cf; | |
231 | ||
232 | cf->pdev = pdev; | |
233 | dev_set_drvdata(dev, cf); | |
234 | ||
235 | /* this primarily just shuts up irq handling noise */ | |
236 | status = request_irq(irq, omap_cf_irq, SA_SHIRQ, | |
237 | driver_name, cf); | |
238 | if (status < 0) | |
239 | goto fail0; | |
240 | cf->irq = irq; | |
241 | cf->socket.pci_irq = irq; | |
242 | ||
243 | switch (seg) { | |
244 | /* NOTE: CS0 could be configured too ... */ | |
245 | case 1: | |
246 | cf->phys_cf = OMAP_CS1_PHYS; | |
247 | break; | |
248 | case 2: | |
249 | cf->phys_cf = OMAP_CS2_PHYS; | |
250 | break; | |
251 | case 3: | |
252 | cf->phys_cf = omap_cs3_phys(); | |
253 | break; | |
254 | default: | |
255 | goto fail1; | |
256 | } | |
257 | ||
258 | /* pcmcia layer only remaps "real" memory */ | |
259 | cf->socket.io_offset = (unsigned long) | |
260 | ioremap(cf->phys_cf + SZ_4K, SZ_2K); | |
261 | if (!cf->socket.io_offset) | |
262 | goto fail1; | |
263 | ||
264 | if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) | |
265 | goto fail1; | |
266 | ||
267 | /* NOTE: CF conflicts with MMC1 */ | |
268 | omap_cfg_reg(W11_1610_CF_CD1); | |
269 | omap_cfg_reg(P11_1610_CF_CD2); | |
270 | omap_cfg_reg(R11_1610_CF_IOIS16); | |
271 | omap_cfg_reg(V10_1610_CF_IREQ); | |
272 | omap_cfg_reg(W10_1610_CF_RESET); | |
273 | ||
274 | CF_CFG_REG = ~(1 << seg); | |
275 | ||
276 | pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq); | |
277 | ||
278 | /* NOTE: better EMIFS setup might support more cards; but the | |
279 | * TRM only shows how to affect regular flash signals, not their | |
280 | * CF/PCMCIA variants... | |
281 | */ | |
282 | pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name, | |
283 | seg, EMIFS_CCS(seg), EMIFS_ACS(seg)); | |
284 | EMIFS_CCS(seg) = 0x0004a1b3; /* synch mode 4 etc */ | |
285 | EMIFS_ACS(seg) = 0x00000000; /* OE hold/setup */ | |
286 | ||
287 | /* CF uses armxor_ck, which is "always" available */ | |
288 | ||
289 | pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name, | |
290 | CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG, | |
291 | omap_cf_present() ? "present" : "(not present)"); | |
292 | ||
293 | cf->socket.owner = THIS_MODULE; | |
294 | cf->socket.dev.dev = 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 | ||
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 | iounmap((void __iomem *) cf->socket.io_offset); | |
311 | release_mem_region(cf->phys_cf, SZ_8K); | |
312 | fail1: | |
313 | free_irq(irq, cf); | |
314 | fail0: | |
315 | kfree(cf); | |
316 | return status; | |
317 | } | |
318 | ||
319 | static int __devexit omap_cf_remove(struct device *dev) | |
320 | { | |
321 | struct omap_cf_socket *cf = dev_get_drvdata(dev); | |
322 | ||
323 | cf->active = 0; | |
324 | pcmcia_unregister_socket(&cf->socket); | |
325 | del_timer_sync(&cf->timer); | |
326 | iounmap((void __iomem *) cf->socket.io_offset); | |
327 | release_mem_region(cf->phys_cf, SZ_8K); | |
328 | free_irq(cf->irq, cf); | |
329 | kfree(cf); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static int omap_cf_suspend(struct device *dev, pm_message_t mesg, u32 level) | |
334 | { | |
335 | if (level != SUSPEND_SAVE_STATE) | |
336 | return 0; | |
337 | return pcmcia_socket_dev_suspend(dev, mesg); | |
338 | } | |
339 | ||
340 | static int omap_cf_resume(struct device *dev, u32 level) | |
341 | { | |
342 | if (level != RESUME_RESTORE_STATE) | |
343 | return 0; | |
344 | return pcmcia_socket_dev_resume(dev); | |
345 | } | |
346 | ||
347 | static struct device_driver omap_cf_driver = { | |
348 | .name = (char *) driver_name, | |
349 | .bus = &platform_bus_type, | |
350 | .probe = omap_cf_probe, | |
351 | .remove = __devexit_p(omap_cf_remove), | |
352 | .suspend = omap_cf_suspend, | |
353 | .resume = omap_cf_resume, | |
354 | }; | |
355 | ||
356 | static int __init omap_cf_init(void) | |
357 | { | |
358 | if (cpu_is_omap16xx()) | |
359 | driver_register(&omap_cf_driver); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static void __exit omap_cf_exit(void) | |
364 | { | |
365 | if (cpu_is_omap16xx()) | |
366 | driver_unregister(&omap_cf_driver); | |
367 | } | |
368 | ||
369 | module_init(omap_cf_init); | |
370 | module_exit(omap_cf_exit); | |
371 | ||
372 | MODULE_DESCRIPTION("OMAP CF Driver"); | |
373 | MODULE_LICENSE("GPL"); |