2 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
4 * Copyright (c) 2005 David Brownell
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.
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>
21 #include <pcmcia/ss.h>
23 #include <asm/hardware.h>
25 #include <asm/mach-types.h>
26 #include <asm/sizes.h>
28 #include <asm/arch/mux.h>
29 #include <asm/arch/tc.h>
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
37 * NOTE: CF controller docs disagree with address space docs as to where
38 * CF_BASE really lives; this is a doc erratum.
40 #define CF_BASE 0xfffe2800
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)
48 /* which chipselect (CS0..CS3) is used for CF (active low) */
49 #define CF_CFG_REG __REG16(CF_BASE + 0x02)
52 #define CF_CONTROL_REG __REG16(CF_BASE + 0x04)
53 # define CF_CONTROL_RESET (1 << 0)
55 #define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
57 /*--------------------------------------------------------------------------*/
59 static const char driver_name
[] = "omap_cf";
61 struct omap_cf_socket
{
62 struct pcmcia_socket socket
;
64 struct timer_list timer
;
68 struct platform_device
*pdev
;
69 unsigned long phys_cf
;
73 #define POLL_INTERVAL (2 * HZ)
75 #define SZ_2K (2 * SZ_1K)
77 /*--------------------------------------------------------------------------*/
79 static int omap_cf_ss_init(struct pcmcia_socket
*s
)
84 /* the timer is primarily to kick this socket's pccardd */
85 static void omap_cf_timer(unsigned long _cf
)
87 struct omap_cf_socket
*cf
= (void *) _cf
;
88 unsigned present
= omap_cf_present();
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
);
98 mod_timer(&cf
->timer
, jiffies
+ POLL_INTERVAL
);
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.
105 static irqreturn_t
omap_cf_irq(int irq
, void *_cf
, struct pt_regs
*r
)
107 omap_cf_timer((unsigned long)_cf
);
111 static int omap_cf_get_status(struct pcmcia_socket
*s
, u_int
*sp
)
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)
120 if (omap_cf_present()) {
121 struct omap_cf_socket
*cf
;
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
;
132 omap_cf_set_socket(struct pcmcia_socket
*sock
, struct socket_state_t
*s
)
136 /* FIXME some non-OSK boards will support power switching */
145 control
= CF_CONTROL_REG
;
146 if (s
->flags
& SS_RESET
)
147 CF_CONTROL_REG
= CF_CONTROL_RESET
;
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
);
157 static int omap_cf_ss_suspend(struct pcmcia_socket
*s
)
159 pr_debug("%s: %s\n", driver_name
, __FUNCTION__
);
160 return omap_cf_set_socket(s
, &dead_socket
);
163 /* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
166 omap_cf_set_io_map(struct pcmcia_socket
*s
, struct pccard_io_map
*io
)
168 struct omap_cf_socket
*cf
;
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;
178 omap_cf_set_mem_map(struct pcmcia_socket
*s
, struct pccard_mem_map
*map
)
180 struct omap_cf_socket
*cf
;
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
;
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
,
201 /*--------------------------------------------------------------------------*/
204 * NOTE: right now the only board-specific platform_data is
205 * "what chipselect is used". Boards could want more.
208 static int __init
omap_cf_probe(struct device
*dev
)
211 struct omap_cf_socket
*cf
;
212 struct platform_device
*pdev
= to_platform_device(dev
);
216 seg
= (int) dev
->platform_data
;
217 if (seg
== 0 || seg
> 3)
220 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
221 irq
= platform_get_irq(pdev
, 0);
225 cf
= kcalloc(1, sizeof *cf
, GFP_KERNEL
);
228 init_timer(&cf
->timer
);
229 cf
->timer
.function
= omap_cf_timer
;
230 cf
->timer
.data
= (unsigned long) cf
;
233 dev_set_drvdata(dev
, cf
);
235 /* this primarily just shuts up irq handling noise */
236 status
= request_irq(irq
, omap_cf_irq
, SA_SHIRQ
,
241 cf
->socket
.pci_irq
= irq
;
244 /* NOTE: CS0 could be configured too ... */
246 cf
->phys_cf
= OMAP_CS1_PHYS
;
249 cf
->phys_cf
= OMAP_CS2_PHYS
;
252 cf
->phys_cf
= omap_cs3_phys();
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
)
264 if (!request_mem_region(cf
->phys_cf
, SZ_8K
, driver_name
))
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
);
274 CF_CFG_REG
= ~(1 << seg
);
276 pr_info("%s: cs%d on irq %d\n", driver_name
, seg
, irq
);
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...
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 */
287 /* CF uses armxor_ck, which is "always" available */
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)");
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
299 cf
->socket
.map_size
= SZ_2K
;
301 status
= pcmcia_register_socket(&cf
->socket
);
306 mod_timer(&cf
->timer
, jiffies
+ POLL_INTERVAL
);
310 iounmap((void __iomem
*) cf
->socket
.io_offset
);
311 release_mem_region(cf
->phys_cf
, SZ_8K
);
319 static int __devexit
omap_cf_remove(struct device
*dev
)
321 struct omap_cf_socket
*cf
= dev_get_drvdata(dev
);
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
);
333 static int omap_cf_suspend(struct device
*dev
, pm_message_t mesg
, u32 level
)
335 if (level
!= SUSPEND_SAVE_STATE
)
337 return pcmcia_socket_dev_suspend(dev
, mesg
);
340 static int omap_cf_resume(struct device
*dev
, u32 level
)
342 if (level
!= RESUME_RESTORE_STATE
)
344 return pcmcia_socket_dev_resume(dev
);
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
,
356 static int __init
omap_cf_init(void)
358 if (cpu_is_omap16xx())
359 driver_register(&omap_cf_driver
);
363 static void __exit
omap_cf_exit(void)
365 if (cpu_is_omap16xx())
366 driver_unregister(&omap_cf_driver
);
369 module_init(omap_cf_init
);
370 module_exit(omap_cf_exit
);
372 MODULE_DESCRIPTION("OMAP CF Driver");
373 MODULE_LICENSE("GPL");