[GitHub/mt8127/android_kernel_alcatel_ttab.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 <asm/mach-types.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;

	if (!machine_is_balloon3())
		return -ENODEV;

	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
af21cbb1 DES	28	#include <asm/mach-types.h>
af21cbb1 DES	29
a9c0629c MV	30	#include "soc_common.h"
	31
	32	/*
	33	* These are a list of interrupt sources that provokes a polled
	34	* check of status
	35	*/
	36	static struct pcmcia_irqs irqs[] = {
	37	{ 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
	38	{ 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
	39	};
	40
	41	static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
	42	{
	43	uint16_t ver;
a9c0629c MV	44
a9c0629c MV	45	ver = __raw_readw(BALLOON3_FPGA_VER);
1b9169d8 MV	46	if (ver < 0x4f08)
1b9169d8 MV	47	pr_warn("The FPGA code, version 0x%04x, is too old. "
a9c0629c MV	48	"PCMCIA/CF support might be broken in this version!",
	49	ver);
	50
	51	skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
	52	return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
	53	}
	54
	55	static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
	56	{
	57	soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
	58	}
	59
	60	static unsigned long balloon3_pcmcia_status[2] = {
	61	BALLOON3_CF_nSTSCHG_BVD1,
	62	BALLOON3_CF_nSTSCHG_BVD1
	63	};
	64
	65	static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
	66	struct pcmcia_state *state)
	67	{
	68	uint16_t status;
	69	int flip;
	70
	71	/* This actually reads the STATUS register */
	72	status = __raw_readw(BALLOON3_CF_STATUS_REG);
	73	flip = (status ^ balloon3_pcmcia_status[skt->nr])
	74	& BALLOON3_CF_nSTSCHG_BVD1;
	75	/*
	76	* Workaround for STSCHG which can't be deasserted:
	77	* We therefore disable/enable corresponding IRQs
	78	* as needed to avoid IRQ locks.
	79	*/
	80	if (flip) {
	81	balloon3_pcmcia_status[skt->nr] = status;
	82	if (status & BALLOON3_CF_nSTSCHG_BVD1)
	83	enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
	84	else
	85	disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
	86	}
	87
	88	state->detect = !gpio_get_value(BALLOON3_GPIO_S0_CD);
	89	state->ready = !!(status & BALLOON3_CF_nIRQ);
	90	state->bvd1 = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
	91	state->bvd2 = 0; /* not available */
	92	state->vs_3v = 1; /* Always true its a CF card */
	93	state->vs_Xv = 0; /* not available */
	94	state->wrprot = 0; /* not available */
	95	}
	96
	97	static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
	98	const socket_state_t *state)
	99	{
1b9169d8 MV	100	__raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG \|
	101	((state->flags & SS_RESET) ?
	102	BALLOON3_FPGA_SETnCLR : 0));
a9c0629c MV	103	return 0;
	104	}
	105
	106	static void balloon3_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
	107	{
	108	}
	109
	110	static void balloon3_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
	111	{
	112	}
	113
	114	static struct pcmcia_low_level balloon3_pcmcia_ops = {
	115	.owner = THIS_MODULE,
	116	.hw_init = balloon3_pcmcia_hw_init,
	117	.hw_shutdown = balloon3_pcmcia_hw_shutdown,
	118	.socket_state = balloon3_pcmcia_socket_state,
	119	.configure_socket = balloon3_pcmcia_configure_socket,
	120	.socket_init = balloon3_pcmcia_socket_init,
	121	.socket_suspend = balloon3_pcmcia_socket_suspend,
	122	.first = 0,
	123	.nr = 1,
	124	};
	125
	126	static struct platform_device *balloon3_pcmcia_device;
	127
	128	static int __init balloon3_pcmcia_init(void)
	129	{
	130	int ret;
	131
af21cbb1 DES	132	if (!machine_is_balloon3())
	133	return -ENODEV;
	134
a9c0629c MV	135	balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
	136	if (!balloon3_pcmcia_device)
	137	return -ENOMEM;
	138
	139	ret = platform_device_add_data(balloon3_pcmcia_device,
	140	&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
	141
	142	if (!ret)
	143	ret = platform_device_add(balloon3_pcmcia_device);
	144
	145	if (ret)
	146	platform_device_put(balloon3_pcmcia_device);
	147
	148	return ret;
	149	}
	150
	151	static void __exit balloon3_pcmcia_exit(void)
	152	{
	153	platform_device_unregister(balloon3_pcmcia_device);
	154	}
	155
	156	module_init(balloon3_pcmcia_init);
	157	module_exit(balloon3_pcmcia_exit);
	158
	159	MODULE_LICENSE("GPL");
	160	MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
	161	MODULE_ALIAS("platform:pxa2xx-pcmcia");
	162	MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");