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linux-next/arch/arm/mach-omap2/mux.c
Grazvydas Ignotas 8a6f7e14fc omap: mux: fix multipath gpio handling
OMAP3530 CBB package can have GPIO126 muxed on 2 pins: mmc1_dat4 and
cam_strobe. This causes a problem with current multipath GPIO mux
handling, which muxes both pins as GPIO126 and makes the GPIO unusable.

Fix this by not muxing any pins if multipath GPIO is detected and
just print a warning instead. It's up to board files to set correct
mux using omap_mux_init_signal and pin name.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2010-08-02 14:23:07 +03:00

756 lines
16 KiB
C

/*
* 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;
}