[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pcmcia / omap_cf.c

/*
 * omap_cf.c -- OMAP 16xx CompactFlash controller driver
 *
 * Copyright (c) 2005 David Brownell
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#include <pcmcia/ss.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/sizes.h>

#include <asm/arch/mux.h>
#include <asm/arch/tc.h>


/* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
 * hard-wired timings to support Compact Flash memory cards; they won't work
 * with various other devices (like WLAN adapters) without some external
 * logic to help out.
 *
 * NOTE:  CF controller docs disagree with address space docs as to where
 * CF_BASE really lives; this is a doc erratum.
 */
#define	CF_BASE	0xfffe2800

/* status; read after IRQ */
#define CF_STATUS_REG		__REG16(CF_BASE + 0x00)
#	define	CF_STATUS_BAD_READ	(1 << 2)
#	define	CF_STATUS_BAD_WRITE	(1 << 1)
#	define	CF_STATUS_CARD_DETECT	(1 << 0)

/* which chipselect (CS0..CS3) is used for CF (active low) */
#define CF_CFG_REG		__REG16(CF_BASE + 0x02)

/* card reset */
#define CF_CONTROL_REG		__REG16(CF_BASE + 0x04)
#	define	CF_CONTROL_RESET	(1 << 0)

#define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))

/*--------------------------------------------------------------------------*/

static const char driver_name[] = "omap_cf";

struct omap_cf_socket {
	struct pcmcia_socket	socket;

	struct timer_list	timer;
	unsigned		present:1;
	unsigned		active:1;

	struct platform_device	*pdev;
	unsigned long		phys_cf;
	u_int			irq;
};

#define	POLL_INTERVAL		(2 * HZ)

#define	SZ_2K			(2 * SZ_1K)

/*--------------------------------------------------------------------------*/

static int omap_cf_ss_init(struct pcmcia_socket *s)
{
	return 0;
}

/* the timer is primarily to kick this socket's pccardd */
static void omap_cf_timer(unsigned long _cf)
{
	struct omap_cf_socket	*cf = (void *) _cf;
	unsigned		present = omap_cf_present();

	if (present != cf->present) {
		cf->present = present;
		pr_debug("%s: card %s\n", driver_name,
			present ? "present" : "gone");
		pcmcia_parse_events(&cf->socket, SS_DETECT);
	}

	if (cf->active)
		mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
}

/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
 * claim the card's IRQ.  It may also detect some card insertions, but
 * not removals; it can't always eliminate timer irqs.
 */
static irqreturn_t omap_cf_irq(int irq, void *_cf, struct pt_regs *r)
{
	omap_cf_timer((unsigned long)_cf);
	return IRQ_HANDLED;
}

static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
	if (!sp)
		return -EINVAL;

	/* FIXME power management should probably be board-specific:
	 *  - 3VCARD vs XVCARD (OSK only handles 3VCARD)
	 *  - POWERON (switched on/off by set_socket)
	 */
	if (omap_cf_present()) {
		struct omap_cf_socket	*cf;

		*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
		cf = container_of(s, struct omap_cf_socket, socket);
		s->irq.AssignedIRQ = cf->irq;
	} else
		*sp = 0;
	return 0;
}

static int
omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
{
	u16		control;

	/* FIXME some non-OSK boards will support power switching */
	switch (s->Vcc) {
	case 0:
	case 33:
		break;
	default:
		return -EINVAL;
	}

	control = CF_CONTROL_REG;
	if (s->flags & SS_RESET)
		CF_CONTROL_REG = CF_CONTROL_RESET;
	else
		CF_CONTROL_REG = 0;

	pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
		driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);

	return 0;
}

static int omap_cf_ss_suspend(struct pcmcia_socket *s)
{
	pr_debug("%s: %s\n", driver_name, __FUNCTION__);
	return omap_cf_set_socket(s, &dead_socket);
}

/* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */

static int
omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
	struct omap_cf_socket	*cf;

	cf = container_of(s, struct omap_cf_socket, socket);
	io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
	io->start = cf->phys_cf + SZ_4K;
	io->stop = io->start + SZ_2K - 1;
	return 0;
}

static int
omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
{
	struct omap_cf_socket	*cf;

	if (map->card_start)
		return -EINVAL;
	cf = container_of(s, struct omap_cf_socket, socket);
	map->static_start = cf->phys_cf;
	map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
	if (map->flags & MAP_ATTRIB)
		map->static_start += SZ_2K;
	return 0;
}

static struct pccard_operations omap_cf_ops = {
	.init			= omap_cf_ss_init,
	.suspend		= omap_cf_ss_suspend,
	.get_status		= omap_cf_get_status,
	.set_socket		= omap_cf_set_socket,
	.set_io_map		= omap_cf_set_io_map,
	.set_mem_map		= omap_cf_set_mem_map,
};

/*--------------------------------------------------------------------------*/

/*
 * NOTE:  right now the only board-specific platform_data is
 * "what chipselect is used".  Boards could want more.
 */

static int __init omap_cf_probe(struct device *dev)
{
	unsigned		seg;
	struct omap_cf_socket	*cf;
	struct platform_device	*pdev = to_platform_device(dev);
	int			irq;
	int			status;

	seg = (int) dev->platform_data;
	if (seg == 0 || seg > 3)
		return -ENODEV;

	/* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
	irq = platform_get_irq(pdev, 0);
	if (!irq)
		return -EINVAL;

	cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
	if (!cf)
		return -ENOMEM;
	init_timer(&cf->timer);
	cf->timer.function = omap_cf_timer;
	cf->timer.data = (unsigned long) cf;

	cf->pdev = pdev;
	dev_set_drvdata(dev, cf);

	/* this primarily just shuts up irq handling noise */
	status = request_irq(irq, omap_cf_irq, SA_SHIRQ,
			driver_name, cf);
	if (status < 0)
		goto fail0;
	cf->irq = irq;
	cf->socket.pci_irq = irq;

	switch (seg) {
	/* NOTE: CS0 could be configured too ... */
	case 1:
		cf->phys_cf = OMAP_CS1_PHYS;
		break;
	case 2:
		cf->phys_cf = OMAP_CS2_PHYS;
		break;
	case 3:
		cf->phys_cf = omap_cs3_phys();
		break;
	default:
		goto  fail1;
	}

	/* pcmcia layer only remaps "real" memory */
	cf->socket.io_offset = (unsigned long)
			ioremap(cf->phys_cf + SZ_4K, SZ_2K);
	if (!cf->socket.io_offset)
		goto fail1;

	if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
		goto fail1;

	/* NOTE:  CF conflicts with MMC1 */
	omap_cfg_reg(W11_1610_CF_CD1);
	omap_cfg_reg(P11_1610_CF_CD2);
	omap_cfg_reg(R11_1610_CF_IOIS16);
	omap_cfg_reg(V10_1610_CF_IREQ);
	omap_cfg_reg(W10_1610_CF_RESET);

	CF_CFG_REG = ~(1 << seg);

	pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);

	/* NOTE:  better EMIFS setup might support more cards; but the
	 * TRM only shows how to affect regular flash signals, not their
	 * CF/PCMCIA variants...
	 */
	pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
			seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
	EMIFS_CCS(seg) = 0x0004a1b3;	/* synch mode 4 etc */
	EMIFS_ACS(seg) = 0x00000000;	/* OE hold/setup */

	/* CF uses armxor_ck, which is "always" available */

	pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
		CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
		omap_cf_present() ? "present" : "(not present)");

	cf->socket.owner = THIS_MODULE;
	cf->socket.dev.dev = dev;
	cf->socket.ops = &omap_cf_ops;
	cf->socket.resource_ops = &pccard_static_ops;
	cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
				| SS_CAP_MEM_ALIGN;
	cf->socket.map_size = SZ_2K;

	status = pcmcia_register_socket(&cf->socket);
	if (status < 0)
		goto fail2;

	cf->active = 1;
	mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
	return 0;

fail2:
	iounmap((void __iomem *) cf->socket.io_offset);
	release_mem_region(cf->phys_cf, SZ_8K);
fail1:
	free_irq(irq, cf);
fail0:
	kfree(cf);
	return status;
}

static int __devexit omap_cf_remove(struct device *dev)
{
	struct omap_cf_socket *cf = dev_get_drvdata(dev);

	cf->active = 0;
	pcmcia_unregister_socket(&cf->socket);
	del_timer_sync(&cf->timer);
	iounmap((void __iomem *) cf->socket.io_offset);
	release_mem_region(cf->phys_cf, SZ_8K);
	free_irq(cf->irq, cf);
	kfree(cf);
	return 0;
}

static struct device_driver omap_cf_driver = {
	.name		= (char *) driver_name,
	.bus		= &platform_bus_type,
	.probe		= omap_cf_probe,
	.remove		= __devexit_p(omap_cf_remove),
	.suspend 	= pcmcia_socket_dev_suspend,
	.resume 	= pcmcia_socket_dev_resume,
};

static int __init omap_cf_init(void)
{
	if (cpu_is_omap16xx())
		driver_register(&omap_cf_driver);
	return 0;
}

static void __exit omap_cf_exit(void)
{
	if (cpu_is_omap16xx())
		driver_unregister(&omap_cf_driver);
}

module_init(omap_cf_init);
module_exit(omap_cf_exit);

MODULE_DESCRIPTION("OMAP CF Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f74e48a5 DB	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>
d052d1be	15	#include <linux/platform_device.h>
f74e48a5 DB	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>
f74e48a5 DB	25	#include <asm/sizes.h>
	26
	27	#include <asm/arch/mux.h>
	28	#include <asm/arch/tc.h>
	29
	30
	31	/* NOTE: don't expect this to support many I/O cards. The 16xx chips have
	32	* hard-wired timings to support Compact Flash memory cards; they won't work
	33	* with various other devices (like WLAN adapters) without some external
	34	* logic to help out.
	35	*
	36	* NOTE: CF controller docs disagree with address space docs as to where
	37	* CF_BASE really lives; this is a doc erratum.
	38	*/
	39	#define CF_BASE 0xfffe2800
	40
	41	/* status; read after IRQ */
	42	#define CF_STATUS_REG __REG16(CF_BASE + 0x00)
	43	# define CF_STATUS_BAD_READ (1 << 2)
	44	# define CF_STATUS_BAD_WRITE (1 << 1)
	45	# define CF_STATUS_CARD_DETECT (1 << 0)
	46
	47	/* which chipselect (CS0..CS3) is used for CF (active low) */
	48	#define CF_CFG_REG __REG16(CF_BASE + 0x02)
	49
	50	/* card reset */
	51	#define CF_CONTROL_REG __REG16(CF_BASE + 0x04)
	52	# define CF_CONTROL_RESET (1 << 0)
	53
	54	#define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
	55
	56	/--------------------------------------------------------------------------/
	57
	58	static const char driver_name[] = "omap_cf";
	59
	60	struct omap_cf_socket {
	61	struct pcmcia_socket socket;
	62
	63	struct timer_list timer;
	64	unsigned present:1;
	65	unsigned active:1;
	66
	67	struct platform_device *pdev;
	68	unsigned long phys_cf;
	69	u_int irq;
	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, struct pt_regs r)
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	/* FIXME power management should probably be board-specific:
116	* - 3VCARD vs XVCARD (OSK only handles 3VCARD)
117	* - POWERON (switched on/off by set_socket)
118	*/
119	if (omap_cf_present()) {
120	struct omap_cf_socket *cf;
121
122	*sp = SS_READY \| SS_DETECT \| SS_POWERON \| SS_3VCARD;
123	cf = container_of(s, struct omap_cf_socket, socket);
124	s->irq.AssignedIRQ = cf->irq;
125	} else
126	*sp = 0;
127	return 0;
128	}
129
130	static int
131	omap_cf_set_socket(struct pcmcia_socket sock, struct socket_state_t s)
132	{
133	u16 control;
134
135	/* FIXME some non-OSK boards will support power switching */
136	switch (s->Vcc) {
137	case 0:
138	case 33:
139	break;
140	default:
141	return -EINVAL;
142	}
143
144	control = CF_CONTROL_REG;
145	if (s->flags & SS_RESET)
146	CF_CONTROL_REG = CF_CONTROL_RESET;
147	else
148	CF_CONTROL_REG = 0;
149
150	pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
151	driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
152
153	return 0;
154	}
155
156	static int omap_cf_ss_suspend(struct pcmcia_socket *s)
157	{
158	pr_debug("%s: %s\n", driver_name, __FUNCTION__);
159	return omap_cf_set_socket(s, &dead_socket);
160	}
161
162	/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
163
164	static int
165	omap_cf_set_io_map(struct pcmcia_socket s, struct pccard_io_map io)
166	{
167	struct omap_cf_socket *cf;
168
169	cf = container_of(s, struct omap_cf_socket, socket);
170	io->flags &= MAP_ACTIVE\|MAP_ATTRIB\|MAP_16BIT;
171	io->start = cf->phys_cf + SZ_4K;
172	io->stop = io->start + SZ_2K - 1;
173	return 0;
174	}
175
176	static int
177	omap_cf_set_mem_map(struct pcmcia_socket s, struct pccard_mem_map map)
178	{
179	struct omap_cf_socket *cf;
180
181	if (map->card_start)
182	return -EINVAL;
183	cf = container_of(s, struct omap_cf_socket, socket);
184	map->static_start = cf->phys_cf;
185	map->flags &= MAP_ACTIVE\|MAP_ATTRIB\|MAP_16BIT;
186	if (map->flags & MAP_ATTRIB)
187	map->static_start += SZ_2K;
188	return 0;
189	}
190
191	static struct pccard_operations omap_cf_ops = {
192	.init = omap_cf_ss_init,
193	.suspend = omap_cf_ss_suspend,
194	.get_status = omap_cf_get_status,
195	.set_socket = omap_cf_set_socket,
196	.set_io_map = omap_cf_set_io_map,
197	.set_mem_map = omap_cf_set_mem_map,
198	};
199
200	/--------------------------------------------------------------------------/
201
202	/*
203	* NOTE: right now the only board-specific platform_data is
204	* "what chipselect is used". Boards could want more.
205	*/
206
207	static int __init omap_cf_probe(struct device *dev)
208	{
209	unsigned seg;
210	struct omap_cf_socket *cf;
211	struct platform_device *pdev = to_platform_device(dev);
212	int irq;
213	int status;
214
215	seg = (int) dev->platform_data;
216	if (seg == 0 \|\| seg > 3)
217	return -ENODEV;
218
219	/* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
220	irq = platform_get_irq(pdev, 0);
221	if (!irq)
222	return -EINVAL;
223
224	cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
225	if (!cf)
226	return -ENOMEM;
227	init_timer(&cf->timer);
228	cf->timer.function = omap_cf_timer;
229	cf->timer.data = (unsigned long) cf;
230
231	cf->pdev = pdev;
232	dev_set_drvdata(dev, cf);
233
234	/* this primarily just shuts up irq handling noise */
235	status = request_irq(irq, omap_cf_irq, SA_SHIRQ,
236	driver_name, cf);
237	if (status < 0)
238	goto fail0;
239	cf->irq = irq;
240	cf->socket.pci_irq = irq;
241
242	switch (seg) {
243	/* NOTE: CS0 could be configured too ... */
244	case 1:
245	cf->phys_cf = OMAP_CS1_PHYS;
246	break;
247	case 2:
248	cf->phys_cf = OMAP_CS2_PHYS;
249	break;
250	case 3:
251	cf->phys_cf = omap_cs3_phys();
252	break;
253	default:
254	goto fail1;
255	}
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	CF_CFG_REG = ~(1 << seg);
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, EMIFS_CCS(seg), EMIFS_ACS(seg));
283	EMIFS_CCS(seg) = 0x0004a1b3; /* synch mode 4 etc */
284	EMIFS_ACS(seg) = 0x00000000; /* 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	CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
290	omap_cf_present() ? "present" : "(not present)");
291
292	cf->socket.owner = THIS_MODULE;
293	cf->socket.dev.dev = 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
297	\| SS_CAP_MEM_ALIGN;
298	cf->socket.map_size = SZ_2K;
299
300	status = pcmcia_register_socket(&cf->socket);
301	if (status < 0)
302	goto fail2;
303
304	cf->active = 1;
305	mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
306	return 0;
307
308	fail2:
309	iounmap((void __iomem *) cf->socket.io_offset);
310	release_mem_region(cf->phys_cf, SZ_8K);
311	fail1:
312	free_irq(irq, cf);
313	fail0:
314	kfree(cf);
315	return status;
316	}
317
318	static int __devexit omap_cf_remove(struct device *dev)
319	{
320	struct omap_cf_socket *cf = dev_get_drvdata(dev);
321
322	cf->active = 0;
323	pcmcia_unregister_socket(&cf->socket);
324	del_timer_sync(&cf->timer);
325	iounmap((void __iomem *) cf->socket.io_offset);
326	release_mem_region(cf->phys_cf, SZ_8K);
327	free_irq(cf->irq, cf);
328	kfree(cf);
329	return 0;
330	}
331
f74e48a5 DB	332	static struct device_driver omap_cf_driver = {
	333	.name = (char *) driver_name,
	334	.bus = &platform_bus_type,
	335	.probe = omap_cf_probe,
	336	.remove = __devexit_p(omap_cf_remove),
9480e307 RK	337	.suspend = pcmcia_socket_dev_suspend,
9480e307 RK	338	.resume = pcmcia_socket_dev_resume,
f74e48a5 DB	339	};
	340
	341	static int __init omap_cf_init(void)
	342	{
	343	if (cpu_is_omap16xx())
	344	driver_register(&omap_cf_driver);
	345	return 0;
	346	}
	347
	348	static void __exit omap_cf_exit(void)
	349	{
	350	if (cpu_is_omap16xx())
	351	driver_unregister(&omap_cf_driver);
	352	}
	353
	354	module_init(omap_cf_init);
	355	module_exit(omap_cf_exit);
	356
	357	MODULE_DESCRIPTION("OMAP CF Driver");
	358	MODULE_LICENSE("GPL");