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/*
* drivers/pcmcia/sa1100_nanoengine.c
*
* PCMCIA implementation routines for BSI nanoEngine.
*
* In order to have a fully functional pcmcia subsystem in a BSE nanoEngine
* board you should carefully read this:
* http://cambuca.ldhs.cetuc.puc-rio.br/nanoengine/
*
* Copyright (C) 2010 Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
*
* Based on original work for kernel 2.4 by
* Miguel Freitas <miguel@cpti.cetuc.puc-rio.br>
*
* 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/device.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
#include <mach/hardware.h>
#include <mach/nanoengine.h>
#include "sa1100_generic.h"
static struct pcmcia_irqs irqs_skt0[] = {
/* socket, IRQ, name */
{ 0, NANOENGINE_IRQ_GPIO_PC_CD0, "PC CD0" },
};
static struct pcmcia_irqs irqs_skt1[] = {
/* socket, IRQ, name */
{ 1, NANOENGINE_IRQ_GPIO_PC_CD1, "PC CD1" },
};
struct nanoengine_pins {
unsigned input_pins;
unsigned output_pins;
unsigned clear_outputs;
unsigned transition_pins;
unsigned pci_irq;
struct pcmcia_irqs *pcmcia_irqs;
unsigned pcmcia_irqs_size;
};
static struct nanoengine_pins nano_skts[] = {
{
.input_pins = GPIO_PC_READY0 | GPIO_PC_CD0,
.output_pins = GPIO_PC_RESET0,
.clear_outputs = GPIO_PC_RESET0,
.transition_pins = NANOENGINE_IRQ_GPIO_PC_CD0,
.pci_irq = NANOENGINE_IRQ_GPIO_PC_READY0,
.pcmcia_irqs = irqs_skt0,
.pcmcia_irqs_size = ARRAY_SIZE(irqs_skt0)
}, {
.input_pins = GPIO_PC_READY1 | GPIO_PC_CD1,
.output_pins = GPIO_PC_RESET1,
.clear_outputs = GPIO_PC_RESET1,
.transition_pins = NANOENGINE_IRQ_GPIO_PC_CD1,
.pci_irq = NANOENGINE_IRQ_GPIO_PC_READY1,
.pcmcia_irqs = irqs_skt1,
.pcmcia_irqs_size = ARRAY_SIZE(irqs_skt1)
}
};
unsigned num_nano_pcmcia_sockets = ARRAY_SIZE(nano_skts);
static int nanoengine_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
unsigned i = skt->nr;
if (i >= num_nano_pcmcia_sockets)
return -ENXIO;
GPDR &= ~nano_skts[i].input_pins;
GPDR |= nano_skts[i].output_pins;
GPCR = nano_skts[i].clear_outputs;
set_irq_type(nano_skts[i].transition_pins, IRQ_TYPE_EDGE_BOTH);
skt->socket.pci_irq = nano_skts[i].pci_irq;
return soc_pcmcia_request_irqs(skt,
nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
}
/*
* Release all resources.
*/
static void nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
unsigned i = skt->nr;
if (i >= num_nano_pcmcia_sockets)
return;
soc_pcmcia_free_irqs(skt,
nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
}
static int nanoengine_pcmcia_configure_socket(
struct soc_pcmcia_socket *skt, const socket_state_t *state)
{
unsigned reset;
unsigned i = skt->nr;
if (i >= num_nano_pcmcia_sockets)
return -ENXIO;
switch (i) {
case 0:
reset = GPIO_PC_RESET0;
break;
case 1:
reset = GPIO_PC_RESET1;
break;
default:
return -ENXIO;
}
if (state->flags & SS_RESET)
GPSR = reset;
else
GPCR = reset;
return 0;
}
static void nanoengine_pcmcia_socket_state(
struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
{
unsigned long levels = GPLR;
unsigned i = skt->nr;
if (i >= num_nano_pcmcia_sockets)
return;
memset(state, 0, sizeof(struct pcmcia_state));
switch (i) {
case 0:
state->ready = (levels & GPIO_PC_READY0) ? 1 : 0;
state->detect = !(levels & GPIO_PC_CD0) ? 1 : 0;
break;
case 1:
state->ready = (levels & GPIO_PC_READY1) ? 1 : 0;
state->detect = !(levels & GPIO_PC_CD1) ? 1 : 0;
break;
default:
return;
}
state->bvd1 = 1;
state->bvd2 = 1;
state->wrprot = 0; /* Not available */
state->vs_3v = 1; /* Can only apply 3.3V */
state->vs_Xv = 0;
}
/*
* Enable card status IRQs on (re-)initialisation. This can
* be called at initialisation, power management event, or
* pcmcia event.
*/
static void nanoengine_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
{
unsigned i = skt->nr;
if (i >= num_nano_pcmcia_sockets)
return;
soc_pcmcia_enable_irqs(skt,
nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
}
/*
* Disable card status IRQs on suspend.
*/
static void nanoengine_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
{
unsigned i = skt->nr;
if (i >= num_nano_pcmcia_sockets)
return;
soc_pcmcia_disable_irqs(skt,
nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
}
static struct pcmcia_low_level nanoengine_pcmcia_ops = {
.owner = THIS_MODULE,
.hw_init = nanoengine_pcmcia_hw_init,
.hw_shutdown = nanoengine_pcmcia_hw_shutdown,
.configure_socket = nanoengine_pcmcia_configure_socket,
.socket_state = nanoengine_pcmcia_socket_state,
.socket_init = nanoengine_pcmcia_socket_init,
.socket_suspend = nanoengine_pcmcia_socket_suspend,
};
int pcmcia_nanoengine_init(struct device *dev)
{
int ret = -ENODEV;
if (machine_is_nanoengine())
ret = sa11xx_drv_pcmcia_probe(
dev, &nanoengine_pcmcia_ops, 0, 2);
return ret;
}
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