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WSL2-Linux-Kernel/arch/arm/mach-omap2/mux.c

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/*
* linux/arch/arm/mach-omap2/mux.c
*
* OMAP2 and OMAP3 pin multiplexing configurations
*
* Copyright (C) 2004 - 2008 Texas Instruments Inc.
* Copyright (C) 2003 - 2008 Nokia Corporation
*
* Written by Tony Lindgren
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <asm/system.h>
#include <plat/control.h>
#include "mux.h"
#define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
#define OMAP_MUX_BASE_SZ 0x5ca
#define MUXABLE_GPIO_MODE3 BIT(0)
struct omap_mux_entry {
struct omap_mux mux;
struct list_head node;
};
static unsigned long mux_phys;
static void __iomem *mux_base;
static u8 omap_mux_flags;
u16 omap_mux_read(u16 reg)
{
if (cpu_is_omap24xx())
return __raw_readb(mux_base + reg);
else
return __raw_readw(mux_base + reg);
}
void omap_mux_write(u16 val, u16 reg)
{
if (cpu_is_omap24xx())
__raw_writeb(val, mux_base + reg);
else
__raw_writew(val, mux_base + reg);
}
void omap_mux_write_array(struct omap_board_mux *board_mux)
{
while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
omap_mux_write(board_mux->value, board_mux->reg_offset);
board_mux++;
}
}
static LIST_HEAD(muxmodes);
static DEFINE_MUTEX(muxmode_mutex);
#ifdef CONFIG_OMAP_MUX
static char *omap_mux_options;
int __init omap_mux_init_gpio(int gpio, int val)
{
struct omap_mux_entry *e;
struct omap_mux *gpio_mux;
u16 old_mode;
u16 mux_mode;
int found = 0;
if (!gpio)
return -EINVAL;
list_for_each_entry(e, &muxmodes, node) {
struct omap_mux *m = &e->mux;
if (gpio == m->gpio) {
gpio_mux = m;
found++;
}
}
if (found == 0) {
printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
return -ENODEV;
}
if (found > 1) {
printk(KERN_INFO "mux: Multiple gpio paths (%d) for gpio%i\n",
found, gpio);
return -EINVAL;
}
old_mode = omap_mux_read(gpio_mux->reg_offset);
mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
if (omap_mux_flags & MUXABLE_GPIO_MODE3)
mux_mode |= OMAP_MUX_MODE3;
else
mux_mode |= OMAP_MUX_MODE4;
printk(KERN_DEBUG "mux: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n",
gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
omap_mux_write(mux_mode, gpio_mux->reg_offset);
return 0;
}
int __init omap_mux_init_signal(char *muxname, int val)
{
struct omap_mux_entry *e;
char *m0_name = NULL, *mode_name = NULL;
int found = 0;
mode_name = strchr(muxname, '.');
if (mode_name) {
*mode_name = '\0';
mode_name++;
m0_name = muxname;
} else {
mode_name = muxname;
}
list_for_each_entry(e, &muxmodes, node) {
struct omap_mux *m = &e->mux;
char *m0_entry = m->muxnames[0];
int i;
if (m0_name && strcmp(m0_name, m0_entry))
continue;
for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
char *mode_cur = m->muxnames[i];
if (!mode_cur)
continue;
if (!strcmp(mode_name, mode_cur)) {
u16 old_mode;
u16 mux_mode;
old_mode = omap_mux_read(m->reg_offset);
mux_mode = val | i;
printk(KERN_DEBUG "mux: Setting signal "
"%s.%s 0x%04x -> 0x%04x\n",
m0_entry, muxname, old_mode, mux_mode);
omap_mux_write(mux_mode, m->reg_offset);
found++;
}
}
}
if (found == 1)
return 0;
if (found > 1) {
printk(KERN_ERR "mux: Multiple signal paths (%i) for %s\n",
found, muxname);
return -EINVAL;
}
printk(KERN_ERR "mux: Could not set signal %s\n", muxname);
return -ENODEV;
}
#ifdef CONFIG_DEBUG_FS
#define OMAP_MUX_MAX_NR_FLAGS 10
#define OMAP_MUX_TEST_FLAG(val, mask) \
if (((val) & (mask)) == (mask)) { \
i++; \
flags[i] = #mask; \
}
/* REVISIT: Add checking for non-optimal mux settings */
static inline void omap_mux_decode(struct seq_file *s, u16 val)
{
char *flags[OMAP_MUX_MAX_NR_FLAGS];
char mode[sizeof("OMAP_MUX_MODE") + 1];
int i = -1;
sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
i++;
flags[i] = mode;
OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
if (val & OMAP_OFF_EN) {
if (!(val & OMAP_OFFOUT_EN)) {
if (!(val & OMAP_OFF_PULL_UP)) {
OMAP_MUX_TEST_FLAG(val,
OMAP_PIN_OFF_INPUT_PULLDOWN);
} else {
OMAP_MUX_TEST_FLAG(val,
OMAP_PIN_OFF_INPUT_PULLUP);
}
} else {
if (!(val & OMAP_OFFOUT_VAL)) {
OMAP_MUX_TEST_FLAG(val,
OMAP_PIN_OFF_OUTPUT_LOW);
} else {
OMAP_MUX_TEST_FLAG(val,
OMAP_PIN_OFF_OUTPUT_HIGH);
}
}
}
if (val & OMAP_INPUT_EN) {
if (val & OMAP_PULL_ENA) {
if (!(val & OMAP_PULL_UP)) {
OMAP_MUX_TEST_FLAG(val,
OMAP_PIN_INPUT_PULLDOWN);
} else {
OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
}
} else {
OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
}
} else {
i++;
flags[i] = "OMAP_PIN_OUTPUT";
}
do {
seq_printf(s, "%s", flags[i]);
if (i > 0)
seq_printf(s, " | ");
} while (i-- > 0);
}
#define OMAP_MUX_DEFNAME_LEN 16
static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
{
struct omap_mux_entry *e;
list_for_each_entry(e, &muxmodes, node) {
struct omap_mux *m = &e->mux;
char m0_def[OMAP_MUX_DEFNAME_LEN];
char *m0_name = m->muxnames[0];
u16 val;
int i, mode;
if (!m0_name)
continue;
/* REVISIT: Needs to be updated if mode0 names get longer */
for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
if (m0_name[i] == '\0') {
m0_def[i] = m0_name[i];
break;
}
m0_def[i] = toupper(m0_name[i]);
}
val = omap_mux_read(m->reg_offset);
mode = val & OMAP_MUX_MODE7;
seq_printf(s, "OMAP%i_MUX(%s, ",
cpu_is_omap34xx() ? 3 : 0, m0_def);
omap_mux_decode(s, val);
seq_printf(s, "),\n");
}
return 0;
}
static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
{
return single_open(file, omap_mux_dbg_board_show, &inode->i_private);
}
static const struct file_operations omap_mux_dbg_board_fops = {
.open = omap_mux_dbg_board_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
{
struct omap_mux *m = s->private;
const char *none = "NA";
u16 val;
int mode;
val = omap_mux_read(m->reg_offset);
mode = val & OMAP_MUX_MODE7;
seq_printf(s, "name: %s.%s (0x%08lx/0x%03x = 0x%04x), b %s, t %s\n",
m->muxnames[0], m->muxnames[mode],
mux_phys + m->reg_offset, m->reg_offset, val,
m->balls[0] ? m->balls[0] : none,
m->balls[1] ? m->balls[1] : none);
seq_printf(s, "mode: ");
omap_mux_decode(s, val);
seq_printf(s, "\n");
seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
m->muxnames[0] ? m->muxnames[0] : none,
m->muxnames[1] ? m->muxnames[1] : none,
m->muxnames[2] ? m->muxnames[2] : none,
m->muxnames[3] ? m->muxnames[3] : none,
m->muxnames[4] ? m->muxnames[4] : none,
m->muxnames[5] ? m->muxnames[5] : none,
m->muxnames[6] ? m->muxnames[6] : none,
m->muxnames[7] ? m->muxnames[7] : none);
return 0;
}
#define OMAP_MUX_MAX_ARG_CHAR 7
static ssize_t omap_mux_dbg_signal_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
char buf[OMAP_MUX_MAX_ARG_CHAR];
struct seq_file *seqf;
struct omap_mux *m;
unsigned long val;
int buf_size, ret;
if (count > OMAP_MUX_MAX_ARG_CHAR)
return -EINVAL;
memset(buf, 0, sizeof(buf));
buf_size = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
ret = strict_strtoul(buf, 0x10, &val);
if (ret < 0)
return ret;
if (val > 0xffff)
return -EINVAL;
seqf = file->private_data;
m = seqf->private;
omap_mux_write((u16)val, m->reg_offset);
*ppos += count;
return count;
}
static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
{
return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
}
static const struct file_operations omap_mux_dbg_signal_fops = {
.open = omap_mux_dbg_signal_open,
.read = seq_read,
.write = omap_mux_dbg_signal_write,
.llseek = seq_lseek,
.release = single_release,
};
static struct dentry *mux_dbg_dir;
static void __init omap_mux_dbg_init(void)
{
struct omap_mux_entry *e;
mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
if (!mux_dbg_dir)
return;
(void)debugfs_create_file("board", S_IRUGO, mux_dbg_dir,
NULL, &omap_mux_dbg_board_fops);
list_for_each_entry(e, &muxmodes, node) {
struct omap_mux *m = &e->mux;
(void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
m, &omap_mux_dbg_signal_fops);
}
}
#else
static inline void omap_mux_dbg_init(void)
{
}
#endif /* CONFIG_DEBUG_FS */
static void __init omap_mux_free_names(struct omap_mux *m)
{
int i;
for (i = 0; i < OMAP_MUX_NR_MODES; i++)
kfree(m->muxnames[i]);
#ifdef CONFIG_DEBUG_FS
for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
kfree(m->balls[i]);
#endif
}
/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
static int __init omap_mux_late_init(void)
{
struct omap_mux_entry *e, *tmp;
list_for_each_entry_safe(e, tmp, &muxmodes, node) {
struct omap_mux *m = &e->mux;
u16 mode = omap_mux_read(m->reg_offset);
if (OMAP_MODE_GPIO(mode))
continue;
#ifndef CONFIG_DEBUG_FS
mutex_lock(&muxmode_mutex);
list_del(&e->node);
mutex_unlock(&muxmode_mutex);
omap_mux_free_names(m);
kfree(m);
#endif
}
omap_mux_dbg_init();
return 0;
}
late_initcall(omap_mux_late_init);
static void __init omap_mux_package_fixup(struct omap_mux *p,
struct omap_mux *superset)
{
while (p->reg_offset != OMAP_MUX_TERMINATOR) {
struct omap_mux *s = superset;
int found = 0;
while (s->reg_offset != OMAP_MUX_TERMINATOR) {
if (s->reg_offset == p->reg_offset) {
*s = *p;
found++;
break;
}
s++;
}
if (!found)
printk(KERN_ERR "mux: Unknown entry offset 0x%x\n",
p->reg_offset);
p++;
}
}
#ifdef CONFIG_DEBUG_FS
static void __init omap_mux_package_init_balls(struct omap_ball *b,
struct omap_mux *superset)
{
while (b->reg_offset != OMAP_MUX_TERMINATOR) {
struct omap_mux *s = superset;
int found = 0;
while (s->reg_offset != OMAP_MUX_TERMINATOR) {
if (s->reg_offset == b->reg_offset) {
s->balls[0] = b->balls[0];
s->balls[1] = b->balls[1];
found++;
break;
}
s++;
}
if (!found)
printk(KERN_ERR "mux: Unknown ball offset 0x%x\n",
b->reg_offset);
b++;
}
}
#else /* CONFIG_DEBUG_FS */
static inline void omap_mux_package_init_balls(struct omap_ball *b,
struct omap_mux *superset)
{
}
#endif /* CONFIG_DEBUG_FS */
static int __init omap_mux_setup(char *options)
{
if (!options)
return 0;
omap_mux_options = options;
return 1;
}
__setup("omap_mux=", omap_mux_setup);
/*
* Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
* cmdline options only override the bootloader values.
* During development, please enable CONFIG_DEBUG_FS, and use the
* signal specific entries under debugfs.
*/
static void __init omap_mux_set_cmdline_signals(void)
{
char *options, *next_opt, *token;
if (!omap_mux_options)
return;
options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
if (!options)
return;
strcpy(options, omap_mux_options);
next_opt = options;
while ((token = strsep(&next_opt, ",")) != NULL) {
char *keyval, *name;
unsigned long val;
keyval = token;
name = strsep(&keyval, "=");
if (name) {
int res;
res = strict_strtoul(keyval, 0x10, &val);
if (res < 0)
continue;
omap_mux_init_signal(name, (u16)val);
}
}
kfree(options);
}
static int __init omap_mux_copy_names(struct omap_mux *src,
struct omap_mux *dst)
{
int i;
for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
if (src->muxnames[i]) {
dst->muxnames[i] =
kmalloc(strlen(src->muxnames[i]) + 1,
GFP_KERNEL);
if (!dst->muxnames[i])
goto free;
strcpy(dst->muxnames[i], src->muxnames[i]);
}
}
#ifdef CONFIG_DEBUG_FS
for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
if (src->balls[i]) {
dst->balls[i] =
kmalloc(strlen(src->balls[i]) + 1,
GFP_KERNEL);
if (!dst->balls[i])
goto free;
strcpy(dst->balls[i], src->balls[i]);
}
}
#endif
return 0;
free:
omap_mux_free_names(dst);
return -ENOMEM;
}
#endif /* CONFIG_OMAP_MUX */
static u16 omap_mux_get_by_gpio(int gpio)
{
struct omap_mux_entry *e;
u16 offset = OMAP_MUX_TERMINATOR;
list_for_each_entry(e, &muxmodes, node) {
struct omap_mux *m = &e->mux;
if (m->gpio == gpio) {
offset = m->reg_offset;
break;
}
}
return offset;
}
/* Needed for dynamic muxing of GPIO pins for off-idle */
u16 omap_mux_get_gpio(int gpio)
{
u16 offset;
offset = omap_mux_get_by_gpio(gpio);
if (offset == OMAP_MUX_TERMINATOR) {
printk(KERN_ERR "mux: Could not get gpio%i\n", gpio);
return offset;
}
return omap_mux_read(offset);
}
/* Needed for dynamic muxing of GPIO pins for off-idle */
void omap_mux_set_gpio(u16 val, int gpio)
{
u16 offset;
offset = omap_mux_get_by_gpio(gpio);
if (offset == OMAP_MUX_TERMINATOR) {
printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
return;
}
omap_mux_write(val, offset);
}
static struct omap_mux * __init omap_mux_list_add(struct omap_mux *src)
{
struct omap_mux_entry *entry;
struct omap_mux *m;
entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
if (!entry)
return NULL;
m = &entry->mux;
memcpy(m, src, sizeof(struct omap_mux_entry));
#ifdef CONFIG_OMAP_MUX
if (omap_mux_copy_names(src, m)) {
kfree(entry);
return NULL;
}
#endif
mutex_lock(&muxmode_mutex);
list_add_tail(&entry->node, &muxmodes);
mutex_unlock(&muxmode_mutex);
return m;
}
/*
* Note if CONFIG_OMAP_MUX is not selected, we will only initialize
* the GPIO to mux offset mapping that is needed for dynamic muxing
* of GPIO pins for off-idle.
*/
static void __init omap_mux_init_list(struct omap_mux *superset)
{
while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
struct omap_mux *entry;
#ifdef CONFIG_OMAP_MUX
if (!superset->muxnames || !superset->muxnames[0]) {
superset++;
continue;
}
#else
/* Skip pins that are not muxed as GPIO by bootloader */
if (!OMAP_MODE_GPIO(omap_mux_read(superset->reg_offset))) {
superset++;
continue;
}
#endif
entry = omap_mux_list_add(superset);
if (!entry) {
printk(KERN_ERR "mux: Could not add entry\n");
return;
}
superset++;
}
}
#ifdef CONFIG_OMAP_MUX
static void omap_mux_init_package(struct omap_mux *superset,
struct omap_mux *package_subset,
struct omap_ball *package_balls)
{
if (package_subset)
omap_mux_package_fixup(package_subset, superset);
if (package_balls)
omap_mux_package_init_balls(package_balls, superset);
}
static void omap_mux_init_signals(struct omap_board_mux *board_mux)
{
omap_mux_set_cmdline_signals();
omap_mux_write_array(board_mux);
}
#else
static void omap_mux_init_package(struct omap_mux *superset,
struct omap_mux *package_subset,
struct omap_ball *package_balls)
{
}
static void omap_mux_init_signals(struct omap_board_mux *board_mux)
{
}
#endif
int __init omap_mux_init(u32 mux_pbase, u32 mux_size,
struct omap_mux *superset,
struct omap_mux *package_subset,
struct omap_board_mux *board_mux,
struct omap_ball *package_balls)
{
if (mux_base)
return -EBUSY;
mux_phys = mux_pbase;
mux_base = ioremap(mux_pbase, mux_size);
if (!mux_base) {
printk(KERN_ERR "mux: Could not ioremap\n");
return -ENODEV;
}
if (cpu_is_omap24xx())
omap_mux_flags = MUXABLE_GPIO_MODE3;
omap_mux_init_package(superset, package_subset, package_balls);
omap_mux_init_list(superset);
omap_mux_init_signals(board_mux);
return 0;
}
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