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PCMCIA: soc_common: add GPIO support for card status signals 

Add GPIO support for reading the card status (card detect, ready,
battery voltage detect) signals into soc_common code.  As we want
interrupts from these GPIOs, this takes over the old irq handling
infrastructure for card status signals, which will now be managed
entirely by the soc_common code.

Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
hifive-unleashed-5.1
Russell King 2011-12-19 22:00:22 +00:00
parent e0d21178ce
commit d9dc878769
2 changed files with 127 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

120
drivers/pcmcia/soc_common.c
View File

@ -32,6 +32,7 @@
#include <linux/cpufreq.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@ -49,6 +50,8 @@
#include "soc_common.h"
static irqreturn_t soc_common_pcmcia_interrupt(int irq, void *dev);
#ifdef CONFIG_PCMCIA_DEBUG
static int pc_debug;
@ -104,6 +107,93 @@ void soc_common_pcmcia_get_timing(struct soc_pcmcia_socket *skt,
}
EXPORT_SYMBOL(soc_common_pcmcia_get_timing);
static void __soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt,
unsigned int nr)
{
unsigned int i;
for (i = 0; i < nr; i++) {
if (skt->stat[i].irq)
free_irq(skt->stat[i].irq, skt);
if (gpio_is_valid(skt->stat[i].gpio))
gpio_free(skt->stat[i].gpio);
}
if (skt->ops->hw_shutdown)
skt->ops->hw_shutdown(skt);
}
static void soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
__soc_pcmcia_hw_shutdown(skt, ARRAY_SIZE(skt->stat));
}
static int soc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
int ret = 0, i;
if (skt->ops->hw_init) {
ret = skt->ops->hw_init(skt);
if (ret)
return ret;
}
for (i = 0; i < ARRAY_SIZE(skt->stat); i++) {
if (gpio_is_valid(skt->stat[i].gpio)) {
int irq;
ret = gpio_request_one(skt->stat[i].gpio, GPIOF_IN,
skt->stat[i].name);
if (ret) {
__soc_pcmcia_hw_shutdown(skt, i);
return ret;
}
irq = gpio_to_irq(skt->stat[i].gpio);
if (i == SOC_STAT_RDY)
skt->socket.pci_irq = irq;
else
skt->stat[i].irq = irq;
}
if (skt->stat[i].irq) {
ret = request_irq(skt->stat[i].irq,
soc_common_pcmcia_interrupt,
IRQF_TRIGGER_NONE,
skt->stat[i].name, skt);
if (ret) {
if (gpio_is_valid(skt->stat[i].gpio))
gpio_free(skt->stat[i].gpio);
__soc_pcmcia_hw_shutdown(skt, i);
return ret;
}
}
}
return ret;
}
static void soc_pcmcia_hw_enable(struct soc_pcmcia_socket *skt)
{
int i;
for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
if (skt->stat[i].irq) {
irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_EDGE_RISING);
irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_EDGE_BOTH);
}
}
static void soc_pcmcia_hw_disable(struct soc_pcmcia_socket *skt)
{
int i;
for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
if (skt->stat[i].irq)
irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_NONE);
}
static unsigned int soc_common_pcmcia_skt_state(struct soc_pcmcia_socket *skt)
{
struct pcmcia_state state;
@ -111,6 +201,22 @@ static unsigned int soc_common_pcmcia_skt_state(struct soc_pcmcia_socket *skt)
memset(&state, 0, sizeof(struct pcmcia_state));
/* Make battery voltage state report 'good' */
state.bvd1 = 1;
state.bvd2 = 1;
/* CD is active low by default */
if (gpio_is_valid(skt->stat[SOC_STAT_CD].gpio))
state.detect = !gpio_get_value(skt->stat[SOC_STAT_CD].gpio);
/* RDY and BVD are active high by default */
if (gpio_is_valid(skt->stat[SOC_STAT_RDY].gpio))
state.ready = !!gpio_get_value(skt->stat[SOC_STAT_RDY].gpio);
if (gpio_is_valid(skt->stat[SOC_STAT_BVD1].gpio))
state.bvd1 = !!gpio_get_value(skt->stat[SOC_STAT_BVD1].gpio);
if (gpio_is_valid(skt->stat[SOC_STAT_BVD2].gpio))
state.bvd2 = !!gpio_get_value(skt->stat[SOC_STAT_BVD2].gpio);
skt->ops->socket_state(skt, &state);
stat = state.detect ? SS_DETECT : 0;
@ -188,6 +294,7 @@ static int soc_common_pcmcia_sock_init(struct pcmcia_socket *sock)
debug(skt, 2, "initializing socket\n");
if (skt->ops->socket_init)
skt->ops->socket_init(skt);
soc_pcmcia_hw_enable(skt);
return 0;
}
@ -207,6 +314,7 @@ static int soc_common_pcmcia_suspend(struct pcmcia_socket *sock)
debug(skt, 2, "suspending socket\n");
soc_pcmcia_hw_disable(skt);
if (skt->ops->socket_suspend)
skt->ops->socket_suspend(skt);
@ -638,10 +746,15 @@ module_exit(soc_pcmcia_cpufreq_unregister);
void soc_pcmcia_init_one(struct soc_pcmcia_socket *skt,
struct pcmcia_low_level *ops, struct device *dev)
{
int i;
skt->ops = ops;
skt->socket.owner = ops->owner;
skt->socket.dev.parent = dev;
skt->socket.pci_irq = NO_IRQ;
for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
skt->stat[i].gpio = -EINVAL;
}
EXPORT_SYMBOL(soc_pcmcia_init_one);
@ -652,8 +765,9 @@ void soc_pcmcia_remove_one(struct soc_pcmcia_socket *skt)
pcmcia_unregister_socket(&skt->socket);
skt->ops->hw_shutdown(skt);
soc_pcmcia_hw_shutdown(skt);
/* should not be required; violates some lowlevel drivers */
soc_common_pcmcia_config_skt(skt, &dead_socket);
list_del(&skt->node);
@ -710,7 +824,7 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
*/
skt->ops->set_timing(skt);
ret = skt->ops->hw_init(skt);
ret = soc_pcmcia_hw_init(skt);
if (ret)
goto out_err_6;
@ -743,7 +857,7 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
pcmcia_unregister_socket(&skt->socket);
out_err_7:
skt->ops->hw_shutdown(skt);
soc_pcmcia_hw_shutdown(skt);
out_err_6:
list_del(&skt->node);
mutex_unlock(&soc_pcmcia_sockets_lock);

10
drivers/pcmcia/soc_common.h
View File

@ -50,6 +50,16 @@ struct soc_pcmcia_socket {
struct resource res_attr;
void __iomem *virt_io;
struct {
int gpio;
unsigned int irq;
const char *name;
} stat[4];
#define SOC_STAT_CD 0 /* Card detect */
#define SOC_STAT_BVD1 1 /* BATDEAD / IOSTSCHG */
#define SOC_STAT_BVD2 2 /* BATWARN / IOSPKR */
#define SOC_STAT_RDY 3 /* Ready / Interrupt */
unsigned int irq_state;
struct timer_list poll_timer;