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/platform_device.h>
15 #include <linux/errno.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/interrupt.h>
20 #include <pcmcia/ss.h>
22 #include <asm/hardware.h>
24 #include <asm/sizes.h>
26 #include <asm/arch/mux.h>
27 #include <asm/arch/tc.h>
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
35 * NOTE: CF controller docs disagree with address space docs as to where
36 * CF_BASE really lives; this is a doc erratum.
38 #define CF_BASE 0xfffe2800
40 /* status; read after IRQ */
41 #define CF_STATUS_REG __REG16(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)
46 /* which chipselect (CS0..CS3) is used for CF (active low) */
47 #define CF_CFG_REG __REG16(CF_BASE + 0x02)
50 #define CF_CONTROL_REG __REG16(CF_BASE + 0x04)
51 # define CF_CONTROL_RESET (1 << 0)
53 #define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
55 /*--------------------------------------------------------------------------*/
57 static const char driver_name
[] = "omap_cf";
59 struct omap_cf_socket
{
60 struct pcmcia_socket socket
;
62 struct timer_list timer
;
66 struct platform_device
*pdev
;
67 unsigned long phys_cf
;
69 struct resource iomem
;
72 #define POLL_INTERVAL (2 * HZ)
74 #define SZ_2K (2 * SZ_1K)
76 /*--------------------------------------------------------------------------*/
78 static int omap_cf_ss_init(struct pcmcia_socket
*s
)
83 /* the timer is primarily to kick this socket's pccardd */
84 static void omap_cf_timer(unsigned long _cf
)
86 struct omap_cf_socket
*cf
= (void *) _cf
;
87 unsigned present
= omap_cf_present();
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
);
97 mod_timer(&cf
->timer
, jiffies
+ POLL_INTERVAL
);
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.
104 static irqreturn_t
omap_cf_irq(int irq
, void *_cf
)
106 omap_cf_timer((unsigned long)_cf
);
110 static int omap_cf_get_status(struct pcmcia_socket
*s
, u_int
*sp
)
115 /* NOTE CF is always 3VCARD */
116 if (omap_cf_present()) {
117 struct omap_cf_socket
*cf
;
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
;
129 omap_cf_set_socket(struct pcmcia_socket
*sock
, struct socket_state_t
*s
)
133 /* REVISIT some non-OSK boards may support power switching */
142 control
= CF_CONTROL_REG
;
143 if (s
->flags
& SS_RESET
)
144 CF_CONTROL_REG
= CF_CONTROL_RESET
;
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
);
154 static int omap_cf_ss_suspend(struct pcmcia_socket
*s
)
156 pr_debug("%s: %s\n", driver_name
, __FUNCTION__
);
157 return omap_cf_set_socket(s
, &dead_socket
);
160 /* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
163 omap_cf_set_io_map(struct pcmcia_socket
*s
, struct pccard_io_map
*io
)
165 struct omap_cf_socket
*cf
;
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;
175 omap_cf_set_mem_map(struct pcmcia_socket
*s
, struct pccard_mem_map
*map
)
177 struct omap_cf_socket
*cf
;
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
;
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
,
198 /*--------------------------------------------------------------------------*/
201 * NOTE: right now the only board-specific platform_data is
202 * "what chipselect is used". Boards could want more.
205 static int __init
omap_cf_probe(struct platform_device
*pdev
)
208 struct omap_cf_socket
*cf
;
212 seg
= (int) pdev
->dev
.platform_data
;
213 if (seg
== 0 || seg
> 3)
216 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
217 irq
= platform_get_irq(pdev
, 0);
221 cf
= kzalloc(sizeof *cf
, GFP_KERNEL
);
224 init_timer(&cf
->timer
);
225 cf
->timer
.function
= omap_cf_timer
;
226 cf
->timer
.data
= (unsigned long) cf
;
229 platform_set_drvdata(pdev
, cf
);
231 /* this primarily just shuts up irq handling noise */
232 status
= request_irq(irq
, omap_cf_irq
, IRQF_SHARED
,
237 cf
->socket
.pci_irq
= irq
;
240 /* NOTE: CS0 could be configured too ... */
242 cf
->phys_cf
= OMAP_CS1_PHYS
;
245 cf
->phys_cf
= OMAP_CS2_PHYS
;
248 cf
->phys_cf
= omap_cs3_phys();
253 cf
->iomem
.start
= cf
->phys_cf
;
254 cf
->iomem
.end
= cf
->iomem
.end
+ SZ_8K
- 1;
255 cf
->iomem
.flags
= IORESOURCE_MEM
;
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
)
263 if (!request_mem_region(cf
->phys_cf
, SZ_8K
, driver_name
))
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
);
273 CF_CFG_REG
= ~(1 << seg
);
275 pr_info("%s: cs%d on irq %d\n", driver_name
, seg
, irq
);
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...
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 */
286 /* CF uses armxor_ck, which is "always" available */
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)");
292 cf
->socket
.owner
= THIS_MODULE
;
293 cf
->socket
.dev
.parent
= &pdev
->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
298 cf
->socket
.map_size
= SZ_2K
;
299 cf
->socket
.io
[0].res
= &cf
->iomem
;
301 status
= pcmcia_register_socket(&cf
->socket
);
306 mod_timer(&cf
->timer
, jiffies
+ POLL_INTERVAL
);
310 release_mem_region(cf
->phys_cf
, SZ_8K
);
312 if (cf
->socket
.io_offset
)
313 iounmap((void __iomem
*) cf
->socket
.io_offset
);
320 static int __exit
omap_cf_remove(struct platform_device
*pdev
)
322 struct omap_cf_socket
*cf
= platform_get_drvdata(pdev
);
325 pcmcia_unregister_socket(&cf
->socket
);
326 del_timer_sync(&cf
->timer
);
327 iounmap((void __iomem
*) cf
->socket
.io_offset
);
328 release_mem_region(cf
->phys_cf
, SZ_8K
);
329 free_irq(cf
->irq
, cf
);
334 static int omap_cf_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
336 return pcmcia_socket_dev_suspend(&pdev
->dev
, mesg
);
339 static int omap_cf_resume(struct platform_device
*pdev
)
341 return pcmcia_socket_dev_resume(&pdev
->dev
);
344 static struct platform_driver omap_cf_driver
= {
346 .name
= (char *) driver_name
,
348 .remove
= __exit_p(omap_cf_remove
),
349 .suspend
= omap_cf_suspend
,
350 .resume
= omap_cf_resume
,
353 static int __init
omap_cf_init(void)
355 if (cpu_is_omap16xx())
356 return platform_driver_probe(&omap_cf_driver
, omap_cf_probe
);
360 static void __exit
omap_cf_exit(void)
362 if (cpu_is_omap16xx())
363 platform_driver_unregister(&omap_cf_driver
);
366 module_init(omap_cf_init
);
367 module_exit(omap_cf_exit
);
369 MODULE_DESCRIPTION("OMAP CF Driver");
370 MODULE_LICENSE("GPL");