[linux-block.git] / drivers / pcmcia / pxa2xx_balloon3.c

/*
 * linux/drivers/pcmcia/pxa2xx_balloon3.c
 *
 * Balloon3 PCMCIA specific routines.
 *
 *  Author:	Nick Bane
 *  Created:	June, 2006
 *  Copyright:	Toby Churchill Ltd
 *  Derived from pxa2xx_mainstone.c, by Nico Pitre
 *
 * Various modification by Marek Vasut <marek.vasut@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/gpio.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <mach/balloon3.h>

#include "soc_common.h"

/*
 * These are a list of interrupt sources that provokes a polled
 * check of status
 */
static struct pcmcia_irqs irqs[] = {
	{ 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
	{ 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
};

static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
	uint16_t ver;

	ver = __raw_readw(BALLOON3_FPGA_VER);
	if (ver < 0x4f08)
		pr_warn("The FPGA code, version 0x%04x, is too old. "
			"PCMCIA/CF support might be broken in this version!",
			ver);

	skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
	return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
}

static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
}

static unsigned long balloon3_pcmcia_status[2] = {
	BALLOON3_CF_nSTSCHG_BVD1,
	BALLOON3_CF_nSTSCHG_BVD1
};

static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
				    struct pcmcia_state *state)
{
	uint16_t status;
	int flip;

	/* This actually reads the STATUS register */
	status = __raw_readw(BALLOON3_CF_STATUS_REG);
	flip = (status ^ balloon3_pcmcia_status[skt->nr])
		& BALLOON3_CF_nSTSCHG_BVD1;
	/*
	 * Workaround for STSCHG which can't be deasserted:
	 * We therefore disable/enable corresponding IRQs
	 * as needed to avoid IRQ locks.
	 */
	if (flip) {
		balloon3_pcmcia_status[skt->nr] = status;
		if (status & BALLOON3_CF_nSTSCHG_BVD1)
			enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
		else
			disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
	}

	state->detect	= !gpio_get_value(BALLOON3_GPIO_S0_CD);
	state->ready	= !!(status & BALLOON3_CF_nIRQ);
	state->bvd1	= !!(status & BALLOON3_CF_nSTSCHG_BVD1);
	state->bvd2	= 0;	/* not available */
	state->vs_3v	= 1;	/* Always true its a CF card */
	state->vs_Xv	= 0;	/* not available */
	state->wrprot	= 0;	/* not available */
}

static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
				       const socket_state_t *state)
{
	__raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG |
			((state->flags & SS_RESET) ?
			BALLOON3_FPGA_SETnCLR : 0));
	return 0;
}

static void balloon3_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
{
}

static void balloon3_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
{
}

static struct pcmcia_low_level balloon3_pcmcia_ops = {
	.owner			= THIS_MODULE,
	.hw_init		= balloon3_pcmcia_hw_init,
	.hw_shutdown		= balloon3_pcmcia_hw_shutdown,
	.socket_state		= balloon3_pcmcia_socket_state,
	.configure_socket	= balloon3_pcmcia_configure_socket,
	.socket_init		= balloon3_pcmcia_socket_init,
	.socket_suspend		= balloon3_pcmcia_socket_suspend,
	.first			= 0,
	.nr			= 1,
};

static struct platform_device *balloon3_pcmcia_device;

static int __init balloon3_pcmcia_init(void)
{
	int ret;

	balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
	if (!balloon3_pcmcia_device)
		return -ENOMEM;

	ret = platform_device_add_data(balloon3_pcmcia_device,
			&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));

	if (!ret)
		ret = platform_device_add(balloon3_pcmcia_device);

	if (ret)
		platform_device_put(balloon3_pcmcia_device);

	return ret;
}

static void __exit balloon3_pcmcia_exit(void)
{
	platform_device_unregister(balloon3_pcmcia_device);
}

module_init(balloon3_pcmcia_init);
module_exit(balloon3_pcmcia_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
MODULE_ALIAS("platform:pxa2xx-pcmcia");
MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");
Commit	Line	Data
a9c0629c MV	1	/*
	2	* linux/drivers/pcmcia/pxa2xx_balloon3.c
	3	*
	4	* Balloon3 PCMCIA specific routines.
	5	*
	6	* Author: Nick Bane
	7	* Created: June, 2006
	8	* Copyright: Toby Churchill Ltd
	9	* Derived from pxa2xx_mainstone.c, by Nico Pitre
	10	*
	11	* Various modification by Marek Vasut <marek.vasut@gmail.com>
	12	*
	13	* This program is free software; you can redistribute it and/or modify
	14	* it under the terms of the GNU General Public License version 2 as
	15	* published by the Free Software Foundation.
	16	*/
	17
	18	#include <linux/module.h>
	19	#include <linux/gpio.h>
	20	#include <linux/errno.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/irq.h>
	24	#include <linux/io.h>
	25
	26	#include <mach/balloon3.h>
	27
	28	#include "soc_common.h"
	29
	30	/*
	31	* These are a list of interrupt sources that provokes a polled
	32	* check of status
	33	*/
	34	static struct pcmcia_irqs irqs[] = {
	35	{ 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
	36	{ 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
	37	};
	38
	39	static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
	40	{
	41	uint16_t ver;
a9c0629c MV	42
a9c0629c MV	43	ver = __raw_readw(BALLOON3_FPGA_VER);
1b9169d8 MV	44	if (ver < 0x4f08)
1b9169d8 MV	45	pr_warn("The FPGA code, version 0x%04x, is too old. "
a9c0629c MV	46	"PCMCIA/CF support might be broken in this version!",
	47	ver);
	48
	49	skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
	50	return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
	51	}
	52
	53	static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
	54	{
	55	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
	56	}
	57
	58	static unsigned long balloon3_pcmcia_status[2] = {
	59	BALLOON3_CF_nSTSCHG_BVD1,
	60	BALLOON3_CF_nSTSCHG_BVD1
	61	};
	62
	63	static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
	64	struct pcmcia_state *state)
	65	{
	66	uint16_t status;
	67	int flip;
	68
	69	/* This actually reads the STATUS register */
	70	status = __raw_readw(BALLOON3_CF_STATUS_REG);
	71	flip = (status ^ balloon3_pcmcia_status[skt->nr])
	72	& BALLOON3_CF_nSTSCHG_BVD1;
	73	/*
	74	* Workaround for STSCHG which can't be deasserted:
	75	* We therefore disable/enable corresponding IRQs
	76	* as needed to avoid IRQ locks.
	77	*/
	78	if (flip) {
	79	balloon3_pcmcia_status[skt->nr] = status;
	80	if (status & BALLOON3_CF_nSTSCHG_BVD1)
	81	enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
	82	else
	83	disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
	84	}
	85
	86	state->detect = !gpio_get_value(BALLOON3_GPIO_S0_CD);
	87	state->ready = !!(status & BALLOON3_CF_nIRQ);
	88	state->bvd1 = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
	89	state->bvd2 = 0; /* not available */
	90	state->vs_3v = 1; /* Always true its a CF card */
	91	state->vs_Xv = 0; /* not available */
	92	state->wrprot = 0; /* not available */
	93	}
	94
	95	static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
	96	const socket_state_t *state)
	97	{
1b9169d8 MV	98	__raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG \|
	99	((state->flags & SS_RESET) ?
	100	BALLOON3_FPGA_SETnCLR : 0));
a9c0629c MV	101	return 0;
	102	}
	103
	104	static void balloon3_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
	105	{
	106	}
	107
	108	static void balloon3_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
	109	{
	110	}
	111
	112	static struct pcmcia_low_level balloon3_pcmcia_ops = {
	113	.owner = THIS_MODULE,
	114	.hw_init = balloon3_pcmcia_hw_init,
	115	.hw_shutdown = balloon3_pcmcia_hw_shutdown,
	116	.socket_state = balloon3_pcmcia_socket_state,
	117	.configure_socket = balloon3_pcmcia_configure_socket,
	118	.socket_init = balloon3_pcmcia_socket_init,
	119	.socket_suspend = balloon3_pcmcia_socket_suspend,
	120	.first = 0,
	121	.nr = 1,
	122	};
	123
	124	static struct platform_device *balloon3_pcmcia_device;
	125
	126	static int __init balloon3_pcmcia_init(void)
	127	{
	128	int ret;
	129
	130	balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
	131	if (!balloon3_pcmcia_device)
	132	return -ENOMEM;
	133
	134	ret = platform_device_add_data(balloon3_pcmcia_device,
	135	&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
	136
	137	if (!ret)
	138	ret = platform_device_add(balloon3_pcmcia_device);
	139
	140	if (ret)
	141	platform_device_put(balloon3_pcmcia_device);
	142
	143	return ret;
	144	}
	145
	146	static void __exit balloon3_pcmcia_exit(void)
	147	{
	148	platform_device_unregister(balloon3_pcmcia_device);
	149	}
	150
	151	module_init(balloon3_pcmcia_init);
	152	module_exit(balloon3_pcmcia_exit);
	153
	154	MODULE_LICENSE("GPL");
	155	MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
	156	MODULE_ALIAS("platform:pxa2xx-pcmcia");
	157	MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");