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/*
* 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 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,
.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");
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