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/*
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
* License terms: GNU General Public License (GPL), version 2
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/err.h>
#include <plat/pincfg.h>
#include <linux/gpio.h>
#include "pins.h"
static LIST_HEAD(pin_lookups);
static DEFINE_MUTEX(pin_lookups_mutex);
static DEFINE_SPINLOCK(pins_lock);
void __init ux500_pins_add(struct ux500_pin_lookup *pl, size_t num)
{
mutex_lock(&pin_lookups_mutex);
while (num--) {
list_add_tail(&pl->node, &pin_lookups);
pl++;
}
mutex_unlock(&pin_lookups_mutex);
}
struct ux500_pins *ux500_pins_get(const char *name)
{
struct ux500_pins *pins = NULL;
struct ux500_pin_lookup *pl;
mutex_lock(&pin_lookups_mutex);
list_for_each_entry(pl, &pin_lookups, node) {
if (!strcmp(pl->name, name)) {
pins = pl->pins;
goto out;
}
}
out:
mutex_unlock(&pin_lookups_mutex);
return pins;
}
int ux500_pins_enable(struct ux500_pins *pins)
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&pins_lock, flags);
if (pins->usage++ == 0)
ret = nmk_config_pins(pins->cfg, pins->num);
spin_unlock_irqrestore(&pins_lock, flags);
return ret;
}
int ux500_pins_disable(struct ux500_pins *pins)
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&pins_lock, flags);
if (WARN_ON(pins->usage == 0))
goto out;
if (--pins->usage == 0)
ret = nmk_config_pins_sleep(pins->cfg, pins->num);
out:
spin_unlock_irqrestore(&pins_lock, flags);
return ret;
}
void ux500_pins_put(struct ux500_pins *pins)
{
WARN_ON(!pins);
}
void __init ux500_offchip_gpio_init(struct ux500_pins *pins)
{
int err;
int i;
int gpio;
int output;
int value;
pin_cfg_t cfg;
for (i=0; i < pins->num; i++) {
cfg = pins->cfg[i];
gpio = PIN_NUM(cfg);
output = PIN_DIR(cfg);
value = PIN_VAL(cfg);
err = gpio_request(gpio, "offchip_gpio_init");
if (err < 0) {
pr_err("pins: gpio_request for gpio=%d failed with"
"err: %d\n", gpio, err);
/* Pin already requested. Try to configure rest. */
continue;
}
if (!output) {
err = gpio_direction_input(gpio);
if (err < 0)
pr_err("pins: gpio_direction_input for gpio=%d"
"failed with err: %d\n", gpio, err);
} else {
err = gpio_direction_output(gpio, value);
if (err < 0)
pr_err("pins: gpio_direction_output for gpio="
"%d failed with err: %d\n", gpio, err);
}
gpio_free(gpio);
}
}
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/gpio/nomadik.h>
#include <mach/gpio.h>
static void show_pin(struct seq_file *s, pin_cfg_t pin)
{
static const char *afnames[] = {
[NMK_GPIO_ALT_GPIO] = "GPIO",
[NMK_GPIO_ALT_A] = "A",
[NMK_GPIO_ALT_B] = "B",
[NMK_GPIO_ALT_C] = "C"
};
static const char *pullnames[] = {
[NMK_GPIO_PULL_NONE] = "none",
[NMK_GPIO_PULL_UP] = "up",
[NMK_GPIO_PULL_DOWN] = "down",
[3] /* illegal */ = "??"
};
int pin_num = PIN_NUM(pin);
int pull = PIN_PULL(pin);
int af = PIN_ALT(pin);
int slpm = PIN_SLPM(pin);
int output = PIN_DIR(pin);
int val = PIN_VAL(pin);
int slpm_pull = PIN_SLPM_PULL(pin);
int slpm_dir = PIN_SLPM_DIR(pin);
int slpm_val = PIN_SLPM_VAL(pin);
seq_printf(s,
" pin %d [%#lx]: af %s, pull %s (%s%s) - slpm: %s%s%s%s\n",
pin_num, pin, afnames[af],
pullnames[pull],
output ? "output " : "input",
output ? (val ? "high" : "low") : "",
slpm ? "no-change/no-wakeup " : "input/wakeup ",
slpm_dir ? (slpm_dir == 1 ? "input " : "output " ) : "",
slpm_dir == 1 ? (slpm_pull == 0 ? "pull: none ":
(slpm_pull == NMK_GPIO_PULL_UP ?
"pull: up " : "pull: down ") ): "",
slpm_dir == 2 ? (slpm_val == 1 ? "low " : "high " ) : "");
}
static int pins_dbg_show(struct seq_file *s, void *iter)
{
struct ux500_pin_lookup *pl;
int i;
bool *pins;
int prev = -2;
int first = 0;
pins = kzalloc(sizeof(bool) * NOMADIK_NR_GPIO, GFP_KERNEL);
mutex_lock(&pin_lookups_mutex);
list_for_each_entry(pl, &pin_lookups, node) {
seq_printf(s, "\n%s (%d) usage: %d\n",
pl->name, pl->pins->num, pl->pins->usage);
for (i = 0; i < pl->pins->num; i++) {
show_pin(s, pl->pins->cfg[i]);
pins[PIN_NUM(pl->pins->cfg[i])] = true;
}
}
mutex_unlock(&pin_lookups_mutex);
seq_printf(s, "\nSummary allocated pins:\n");
for (i = 0; i < NOMADIK_NR_GPIO; i++) {
if (prev == i - 1) {
if (pins[i])
prev = i;
else
if (prev > 0) {
if (first != prev)
seq_printf(s, "-%d, ", prev);
else
seq_printf(s, ", ");
}
continue;
}
if (pins[i]) {
seq_printf(s, "%d", i);
prev = i;
first = i;
}
}
if (prev == i - 1 && first != prev)
seq_printf(s, "-%d", prev);
seq_printf(s, "\n");
kfree(pins);
return 0;
}
static int pins_dbg_open(struct inode *inode,
struct file *file)
{
return single_open(file, pins_dbg_show, inode->i_private);
}
static const struct file_operations pins_fops = {
.open = pins_dbg_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int __init pins_dbg_init(void)
{
(void) debugfs_create_file("pins", S_IRUGO,
NULL,
NULL,
&pins_fops);
return 0;
}
late_initcall(pins_dbg_init);
#endif
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