138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
#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");
|