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 <mach/hardware.h>
24 #include <asm/sizes.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 (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 (CF_BASE + 0x02)
50 #define CF_CONTROL (CF_BASE + 0x04)
51 # define CF_CONTROL_RESET (1 << 0)
53 #define omap_cf_present() (!(omap_readw(CF_STATUS) & 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 /*--------------------------------------------------------------------------*/
76 static int omap_cf_ss_init(struct pcmcia_socket
*s
)
81 /* the timer is primarily to kick this socket's pccardd */
82 static void omap_cf_timer(unsigned long _cf
)
84 struct omap_cf_socket
*cf
= (void *) _cf
;
85 unsigned present
= omap_cf_present();
87 if (present
!= cf
->present
) {
88 cf
->present
= present
;
89 pr_debug("%s: card %s\n", driver_name
,
90 present
? "present" : "gone");
91 pcmcia_parse_events(&cf
->socket
, SS_DETECT
);
95 mod_timer(&cf
->timer
, jiffies
+ POLL_INTERVAL
);
98 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers
99 * claim the card's IRQ. It may also detect some card insertions, but
100 * not removals; it can't always eliminate timer irqs.
102 static irqreturn_t
omap_cf_irq(int irq
, void *_cf
)
104 omap_cf_timer((unsigned long)_cf
);
108 static int omap_cf_get_status(struct pcmcia_socket
*s
, u_int
*sp
)
113 /* NOTE CF is always 3VCARD */
114 if (omap_cf_present()) {
115 struct omap_cf_socket
*cf
;
117 *sp
= SS_READY
| SS_DETECT
| SS_POWERON
| SS_3VCARD
;
118 cf
= container_of(s
, struct omap_cf_socket
, socket
);
119 s
->irq
.AssignedIRQ
= 0;
120 s
->pci_irq
= cf
->irq
;
127 omap_cf_set_socket(struct pcmcia_socket
*sock
, struct socket_state_t
*s
)
131 /* REVISIT some non-OSK boards may support power switching */
140 control
= omap_readw(CF_CONTROL
);
141 if (s
->flags
& SS_RESET
)
142 omap_writew(CF_CONTROL_RESET
, CF_CONTROL
);
144 omap_writew(0, CF_CONTROL
);
146 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
147 driver_name
, s
->Vcc
, s
->io_irq
, s
->flags
, s
->csc_mask
);
152 static int omap_cf_ss_suspend(struct pcmcia_socket
*s
)
154 pr_debug("%s: %s\n", driver_name
, __func__
);
155 return omap_cf_set_socket(s
, &dead_socket
);
158 /* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
161 omap_cf_set_io_map(struct pcmcia_socket
*s
, struct pccard_io_map
*io
)
163 struct omap_cf_socket
*cf
;
165 cf
= container_of(s
, struct omap_cf_socket
, socket
);
166 io
->flags
&= MAP_ACTIVE
|MAP_ATTRIB
|MAP_16BIT
;
167 io
->start
= cf
->phys_cf
+ SZ_4K
;
168 io
->stop
= io
->start
+ SZ_2K
- 1;
173 omap_cf_set_mem_map(struct pcmcia_socket
*s
, struct pccard_mem_map
*map
)
175 struct omap_cf_socket
*cf
;
179 cf
= container_of(s
, struct omap_cf_socket
, socket
);
180 map
->static_start
= cf
->phys_cf
;
181 map
->flags
&= MAP_ACTIVE
|MAP_ATTRIB
|MAP_16BIT
;
182 if (map
->flags
& MAP_ATTRIB
)
183 map
->static_start
+= SZ_2K
;
187 static struct pccard_operations omap_cf_ops
= {
188 .init
= omap_cf_ss_init
,
189 .suspend
= omap_cf_ss_suspend
,
190 .get_status
= omap_cf_get_status
,
191 .set_socket
= omap_cf_set_socket
,
192 .set_io_map
= omap_cf_set_io_map
,
193 .set_mem_map
= omap_cf_set_mem_map
,
196 /*--------------------------------------------------------------------------*/
199 * NOTE: right now the only board-specific platform_data is
200 * "what chipselect is used". Boards could want more.
203 static int __init
omap_cf_probe(struct platform_device
*pdev
)
206 struct omap_cf_socket
*cf
;
210 seg
= (int) pdev
->dev
.platform_data
;
211 if (seg
== 0 || seg
> 3)
214 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
215 irq
= platform_get_irq(pdev
, 0);
219 cf
= kzalloc(sizeof *cf
, GFP_KERNEL
);
222 init_timer(&cf
->timer
);
223 cf
->timer
.function
= omap_cf_timer
;
224 cf
->timer
.data
= (unsigned long) cf
;
227 platform_set_drvdata(pdev
, cf
);
229 /* this primarily just shuts up irq handling noise */
230 status
= request_irq(irq
, omap_cf_irq
, IRQF_SHARED
,
235 cf
->socket
.pci_irq
= irq
;
238 /* NOTE: CS0 could be configured too ... */
240 cf
->phys_cf
= OMAP_CS1_PHYS
;
243 cf
->phys_cf
= OMAP_CS2_PHYS
;
246 cf
->phys_cf
= omap_cs3_phys();
251 cf
->iomem
.start
= cf
->phys_cf
;
252 cf
->iomem
.end
= cf
->iomem
.end
+ SZ_8K
- 1;
253 cf
->iomem
.flags
= IORESOURCE_MEM
;
255 /* pcmcia layer only remaps "real" memory */
256 cf
->socket
.io_offset
= (unsigned long)
257 ioremap(cf
->phys_cf
+ SZ_4K
, SZ_2K
);
258 if (!cf
->socket
.io_offset
)
261 if (!request_mem_region(cf
->phys_cf
, SZ_8K
, driver_name
))
264 /* NOTE: CF conflicts with MMC1 */
265 omap_cfg_reg(W11_1610_CF_CD1
);
266 omap_cfg_reg(P11_1610_CF_CD2
);
267 omap_cfg_reg(R11_1610_CF_IOIS16
);
268 omap_cfg_reg(V10_1610_CF_IREQ
);
269 omap_cfg_reg(W10_1610_CF_RESET
);
271 omap_writew(~(1 << seg
), CF_CFG
);
273 pr_info("%s: cs%d on irq %d\n", driver_name
, seg
, irq
);
275 /* NOTE: better EMIFS setup might support more cards; but the
276 * TRM only shows how to affect regular flash signals, not their
277 * CF/PCMCIA variants...
279 pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name
,
280 seg
, omap_readl(EMIFS_CCS(seg
)), omap_readl(EMIFS_ACS(seg
)));
281 omap_writel(0x0004a1b3, EMIFS_CCS(seg
)); /* synch mode 4 etc */
282 omap_writel(0x00000000, EMIFS_ACS(seg
)); /* OE hold/setup */
284 /* CF uses armxor_ck, which is "always" available */
286 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name
,
287 omap_readw(CF_STATUS
), omap_readw(CF_CFG
),
288 omap_readw(CF_CONTROL
),
289 omap_cf_present() ? "present" : "(not present)");
291 cf
->socket
.owner
= THIS_MODULE
;
292 cf
->socket
.dev
.parent
= &pdev
->dev
;
293 cf
->socket
.ops
= &omap_cf_ops
;
294 cf
->socket
.resource_ops
= &pccard_static_ops
;
295 cf
->socket
.features
= SS_CAP_PCCARD
| SS_CAP_STATIC_MAP
297 cf
->socket
.map_size
= SZ_2K
;
298 cf
->socket
.io
[0].res
= &cf
->iomem
;
300 status
= pcmcia_register_socket(&cf
->socket
);
305 mod_timer(&cf
->timer
, jiffies
+ POLL_INTERVAL
);
309 release_mem_region(cf
->phys_cf
, SZ_8K
);
311 if (cf
->socket
.io_offset
)
312 iounmap((void __iomem
*) cf
->socket
.io_offset
);
319 static int __exit
omap_cf_remove(struct platform_device
*pdev
)
321 struct omap_cf_socket
*cf
= platform_get_drvdata(pdev
);
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 struct platform_driver omap_cf_driver
= {
335 .name
= (char *) driver_name
,
336 .owner
= THIS_MODULE
,
338 .remove
= __exit_p(omap_cf_remove
),
341 static int __init
omap_cf_init(void)
343 if (cpu_is_omap16xx())
344 return platform_driver_probe(&omap_cf_driver
, omap_cf_probe
);
348 static void __exit
omap_cf_exit(void)
350 if (cpu_is_omap16xx())
351 platform_driver_unregister(&omap_cf_driver
);
354 module_init(omap_cf_init
);
355 module_exit(omap_cf_exit
);
357 MODULE_DESCRIPTION("OMAP CF Driver");
358 MODULE_LICENSE("GPL");
359 MODULE_ALIAS("platform:omap_cf");