[mirror_ubuntu-bionic-kernel.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"

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;
	skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
	skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
	skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
	skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";

	return 0;
}

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->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 */
}

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 struct pcmcia_low_level balloon3_pcmcia_ops = {
	.owner			= THIS_MODULE,
	.hw_init		= balloon3_pcmcia_hw_init,
	.socket_state		= balloon3_pcmcia_socket_state,
	.configure_socket	= balloon3_pcmcia_configure_socket,
	.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
	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 <asm/mach-types.h>
	29
	30	#include "soc_common.h"
	31
	32	static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
	33	{
	34	uint16_t ver;
	35
	36	ver = __raw_readw(BALLOON3_FPGA_VER);
	37	if (ver < 0x4f08)
	38	pr_warn("The FPGA code, version 0x%04x, is too old. "
	39	"PCMCIA/CF support might be broken in this version!",
	40	ver);
	41
	42	skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
	43	skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
	44	skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
	45	skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
	46	skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
	47
	48	return 0;
	49	}
	50
	51	static unsigned long balloon3_pcmcia_status[2] = {
	52	BALLOON3_CF_nSTSCHG_BVD1,
	53	BALLOON3_CF_nSTSCHG_BVD1
	54	};
	55
	56	static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
	57	struct pcmcia_state *state)
	58	{
	59	uint16_t status;
	60	int flip;
	61
	62	/* This actually reads the STATUS register */
	63	status = __raw_readw(BALLOON3_CF_STATUS_REG);
	64	flip = (status ^ balloon3_pcmcia_status[skt->nr])
	65	& BALLOON3_CF_nSTSCHG_BVD1;
	66	/*
	67	* Workaround for STSCHG which can't be deasserted:
	68	* We therefore disable/enable corresponding IRQs
	69	* as needed to avoid IRQ locks.
	70	*/
	71	if (flip) {
	72	balloon3_pcmcia_status[skt->nr] = status;
	73	if (status & BALLOON3_CF_nSTSCHG_BVD1)
	74	enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
	75	else
	76	disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
	77	}
	78
	79	state->ready = !!(status & BALLOON3_CF_nIRQ);
	80	state->bvd1 = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
	81	state->bvd2 = 0; /* not available */
	82	state->vs_3v = 1; /* Always true its a CF card */
	83	state->vs_Xv = 0; /* not available */
	84	}
	85
	86	static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
	87	const socket_state_t *state)
	88	{
	89	__raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
	90	((state->flags & SS_RESET) ?
	91	BALLOON3_FPGA_SETnCLR : 0));
	92	return 0;
	93	}
	94
	95	static struct pcmcia_low_level balloon3_pcmcia_ops = {
	96	.owner = THIS_MODULE,
	97	.hw_init = balloon3_pcmcia_hw_init,
	98	.socket_state = balloon3_pcmcia_socket_state,
	99	.configure_socket = balloon3_pcmcia_configure_socket,
	100	.first = 0,
	101	.nr = 1,
	102	};
	103
	104	static struct platform_device *balloon3_pcmcia_device;
	105
	106	static int __init balloon3_pcmcia_init(void)
	107	{
	108	int ret;
	109
	110	if (!machine_is_balloon3())
	111	return -ENODEV;
	112
	113	balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
	114	if (!balloon3_pcmcia_device)
	115	return -ENOMEM;
	116
	117	ret = platform_device_add_data(balloon3_pcmcia_device,
	118	&balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
	119
	120	if (!ret)
	121	ret = platform_device_add(balloon3_pcmcia_device);
	122
	123	if (ret)
	124	platform_device_put(balloon3_pcmcia_device);
	125
	126	return ret;
	127	}
	128
	129	static void __exit balloon3_pcmcia_exit(void)
	130	{
	131	platform_device_unregister(balloon3_pcmcia_device);
	132	}
	133
	134	module_init(balloon3_pcmcia_init);
	135	module_exit(balloon3_pcmcia_exit);
	136
	137	MODULE_LICENSE("GPL");
	138	MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
	139	MODULE_ALIAS("platform:pxa2xx-pcmcia");
	140	MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");