linux/drivers/pcmcia/pxa2xx_balloon3.c
Marek Vasut 1b9169d8a0 ARM: pxa: Update Balloon3 for new FPGA firmware
The new FPGA firmware in Balloon3 uses different methods to control it's bus
control lines. In the new version, there are separate registers to set/clear
bus control lines. This patch updates affected places.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-12-20 23:14:02 +08:00

158 lines
4.1 KiB
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");