linux/arch/arm/mach-omap2/mux.c
Tony Lindgren 97899e555b ARM: OMAP: Fix kernel panic with HSMMC when twl4030_gpio is a module
On some omaps twl4030_gpio has a callback to try to initialize
the MMC controller. If twl4030_gpio is compiled as a module,
bad things can happen because the callback function starts
calling functions that are supposed to be marked __init:

Kernel panic - not syncing: Attempted to kill the idle task!
twl4030_gpio twl4030_gpio: can't dispatch IRQs from modules
gpiochip_add: registered GPIOs 192 to 209 on device: twl4030
Unable to handle kernel paging request at virtual address b82a4c74
...

Additionally if this does not fail, warnings are produced
about trying to register the MMC multiple times.

Fix this by removing __init from omap_mux_get_by_name,
and add checks if omap2_hsmmc_init() is getting called more
than once.

Note that this will get fixed properly later on by splitting
omap2_hsmmc_init into two functions.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2012-02-20 09:43:28 -08:00

1159 lines
26 KiB
C

/*
* linux/arch/arm/mach-omap2/mux.c
*
* OMAP2, OMAP3 and OMAP4 pin multiplexing configurations
*
* Copyright (C) 2004 - 2010 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/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/system.h>
#include <plat/omap_hwmod.h>
#include "control.h"
#include "mux.h"
#include "prm.h"
#define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
#define OMAP_MUX_BASE_SZ 0x5ca
struct omap_mux_entry {
struct omap_mux mux;
struct list_head node;
};
static LIST_HEAD(mux_partitions);
static DEFINE_MUTEX(muxmode_mutex);
struct omap_mux_partition *omap_mux_get(const char *name)
{
struct omap_mux_partition *partition;
list_for_each_entry(partition, &mux_partitions, node) {
if (!strcmp(name, partition->name))
return partition;
}
return NULL;
}
u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
{
if (partition->flags & OMAP_MUX_REG_8BIT)
return __raw_readb(partition->base + reg);
else
return __raw_readw(partition->base + reg);
}
void omap_mux_write(struct omap_mux_partition *partition, u16 val,
u16 reg)
{
if (partition->flags & OMAP_MUX_REG_8BIT)
__raw_writeb(val, partition->base + reg);
else
__raw_writew(val, partition->base + reg);
}
void omap_mux_write_array(struct omap_mux_partition *partition,
struct omap_board_mux *board_mux)
{
if (!board_mux)
return;
while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
omap_mux_write(partition, board_mux->value,
board_mux->reg_offset);
board_mux++;
}
}
#ifdef CONFIG_OMAP_MUX
static char *omap_mux_options;
static int _omap_mux_init_gpio(struct omap_mux_partition *partition,
int gpio, int val)
{
struct omap_mux_entry *e;
struct omap_mux *gpio_mux = NULL;
u16 old_mode;
u16 mux_mode;
int found = 0;
struct list_head *muxmodes = &partition->muxmodes;
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) {
pr_err("%s: Could not set gpio%i\n", __func__, gpio);
return -ENODEV;
}
if (found > 1) {
pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
found, gpio);
return -EINVAL;
}
old_mode = omap_mux_read(partition, gpio_mux->reg_offset);
mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
if (partition->flags & OMAP_MUX_GPIO_IN_MODE3)
mux_mode |= OMAP_MUX_MODE3;
else
mux_mode |= OMAP_MUX_MODE4;
pr_debug("%s: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n", __func__,
gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
omap_mux_write(partition, mux_mode, gpio_mux->reg_offset);
return 0;
}
int omap_mux_init_gpio(int gpio, int val)
{
struct omap_mux_partition *partition;
int ret;
list_for_each_entry(partition, &mux_partitions, node) {
ret = _omap_mux_init_gpio(partition, gpio, val);
if (!ret)
return ret;
}
return -ENODEV;
}
static int _omap_mux_get_by_name(struct omap_mux_partition *partition,
const char *muxname,
struct omap_mux **found_mux)
{
struct omap_mux *mux = NULL;
struct omap_mux_entry *e;
const char *mode_name;
int found = 0, found_mode = 0, mode0_len = 0;
struct list_head *muxmodes = &partition->muxmodes;
mode_name = strchr(muxname, '.');
if (mode_name) {
mode0_len = strlen(muxname) - strlen(mode_name);
mode_name++;
} else {
mode_name = muxname;
}
list_for_each_entry(e, muxmodes, node) {
char *m0_entry;
int i;
mux = &e->mux;
m0_entry = mux->muxnames[0];
/* First check for full name in mode0.muxmode format */
if (mode0_len && strncmp(muxname, m0_entry, mode0_len))
continue;
/* Then check for muxmode only */
for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
char *mode_cur = mux->muxnames[i];
if (!mode_cur)
continue;
if (!strcmp(mode_name, mode_cur)) {
*found_mux = mux;
found++;
found_mode = i;
}
}
}
if (found == 1) {
return found_mode;
}
if (found > 1) {
pr_err("%s: Multiple signal paths (%i) for %s\n", __func__,
found, muxname);
return -EINVAL;
}
pr_err("%s: Could not find signal %s\n", __func__, muxname);
return -ENODEV;
}
static int
omap_mux_get_by_name(const char *muxname,
struct omap_mux_partition **found_partition,
struct omap_mux **found_mux)
{
struct omap_mux_partition *partition;
list_for_each_entry(partition, &mux_partitions, node) {
struct omap_mux *mux = NULL;
int mux_mode = _omap_mux_get_by_name(partition, muxname, &mux);
if (mux_mode < 0)
continue;
*found_partition = partition;
*found_mux = mux;
return mux_mode;
}
return -ENODEV;
}
int omap_mux_init_signal(const char *muxname, int val)
{
struct omap_mux_partition *partition = NULL;
struct omap_mux *mux = NULL;
u16 old_mode;
int mux_mode;
mux_mode = omap_mux_get_by_name(muxname, &partition, &mux);
if (mux_mode < 0)
return mux_mode;
old_mode = omap_mux_read(partition, mux->reg_offset);
mux_mode |= val;
pr_debug("%s: Setting signal %s 0x%04x -> 0x%04x\n",
__func__, muxname, old_mode, mux_mode);
omap_mux_write(partition, mux_mode, mux->reg_offset);
return 0;
}
struct omap_hwmod_mux_info * __init
omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
{
struct omap_hwmod_mux_info *hmux;
int i, nr_pads_dynamic = 0;
if (!bpads || nr_pads < 1)
return NULL;
hmux = kzalloc(sizeof(struct omap_hwmod_mux_info), GFP_KERNEL);
if (!hmux)
goto err1;
hmux->nr_pads = nr_pads;
hmux->pads = kzalloc(sizeof(struct omap_device_pad) *
nr_pads, GFP_KERNEL);
if (!hmux->pads)
goto err2;
for (i = 0; i < hmux->nr_pads; i++) {
struct omap_mux_partition *partition;
struct omap_device_pad *bpad = &bpads[i], *pad = &hmux->pads[i];
struct omap_mux *mux;
int mux_mode;
mux_mode = omap_mux_get_by_name(bpad->name, &partition, &mux);
if (mux_mode < 0)
goto err3;
if (!pad->partition)
pad->partition = partition;
if (!pad->mux)
pad->mux = mux;
pad->name = kzalloc(strlen(bpad->name) + 1, GFP_KERNEL);
if (!pad->name) {
int j;
for (j = i - 1; j >= 0; j--)
kfree(hmux->pads[j].name);
goto err3;
}
strcpy(pad->name, bpad->name);
pad->flags = bpad->flags;
pad->enable = bpad->enable;
pad->idle = bpad->idle;
pad->off = bpad->off;
if (pad->flags &
(OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP))
nr_pads_dynamic++;
pr_debug("%s: Initialized %s\n", __func__, pad->name);
}
if (!nr_pads_dynamic)
return hmux;
/*
* Add pads that need dynamic muxing into a separate list
*/
hmux->nr_pads_dynamic = nr_pads_dynamic;
hmux->pads_dynamic = kzalloc(sizeof(struct omap_device_pad *) *
nr_pads_dynamic, GFP_KERNEL);
if (!hmux->pads_dynamic) {
pr_err("%s: Could not allocate dynamic pads\n", __func__);
return hmux;
}
nr_pads_dynamic = 0;
for (i = 0; i < hmux->nr_pads; i++) {
struct omap_device_pad *pad = &hmux->pads[i];
if (pad->flags &
(OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP)) {
pr_debug("%s: pad %s tagged dynamic\n",
__func__, pad->name);
hmux->pads_dynamic[nr_pads_dynamic] = pad;
nr_pads_dynamic++;
}
}
return hmux;
err3:
kfree(hmux->pads);
err2:
kfree(hmux);
err1:
pr_err("%s: Could not allocate device mux entry\n", __func__);
return NULL;
}
/**
* omap_hwmod_mux_scan_wakeups - omap hwmod scan wakeup pads
* @hmux: Pads for a hwmod
* @mpu_irqs: MPU irq array for a hwmod
*
* Scans the wakeup status of pads for a single hwmod. If an irq
* array is defined for this mux, the parser will call the registered
* ISRs for corresponding pads, otherwise the parser will stop at the
* first wakeup active pad and return. Returns true if there is a
* pending and non-served wakeup event for the mux, otherwise false.
*/
static bool omap_hwmod_mux_scan_wakeups(struct omap_hwmod_mux_info *hmux,
struct omap_hwmod_irq_info *mpu_irqs)
{
int i, irq;
unsigned int val;
u32 handled_irqs = 0;
for (i = 0; i < hmux->nr_pads_dynamic; i++) {
struct omap_device_pad *pad = hmux->pads_dynamic[i];
if (!(pad->flags & OMAP_DEVICE_PAD_WAKEUP) ||
!(pad->idle & OMAP_WAKEUP_EN))
continue;
val = omap_mux_read(pad->partition, pad->mux->reg_offset);
if (!(val & OMAP_WAKEUP_EVENT))
continue;
if (!hmux->irqs)
return true;
irq = hmux->irqs[i];
/* make sure we only handle each irq once */
if (handled_irqs & 1 << irq)
continue;
handled_irqs |= 1 << irq;
generic_handle_irq(mpu_irqs[irq].irq);
}
return false;
}
/**
* _omap_hwmod_mux_handle_irq - Process wakeup events for a single hwmod
*
* Checks a single hwmod for every wakeup capable pad to see if there is an
* active wakeup event. If this is the case, call the corresponding ISR.
*/
static int _omap_hwmod_mux_handle_irq(struct omap_hwmod *oh, void *data)
{
if (!oh->mux || !oh->mux->enabled)
return 0;
if (omap_hwmod_mux_scan_wakeups(oh->mux, oh->mpu_irqs))
generic_handle_irq(oh->mpu_irqs[0].irq);
return 0;
}
/**
* omap_hwmod_mux_handle_irq - Process pad wakeup irqs.
*
* Calls a function for each registered omap_hwmod to check
* pad wakeup statuses.
*/
static irqreturn_t omap_hwmod_mux_handle_irq(int irq, void *unused)
{
omap_hwmod_for_each(_omap_hwmod_mux_handle_irq, NULL);
return IRQ_HANDLED;
}
/* Assumes the calling function takes care of locking */
void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
{
int i;
/* Runtime idling of dynamic pads */
if (state == _HWMOD_STATE_IDLE && hmux->enabled) {
for (i = 0; i < hmux->nr_pads_dynamic; i++) {
struct omap_device_pad *pad = hmux->pads_dynamic[i];
int val = -EINVAL;
val = pad->idle;
omap_mux_write(pad->partition, val,
pad->mux->reg_offset);
}
return;
}
/* Runtime enabling of dynamic pads */
if ((state == _HWMOD_STATE_ENABLED) && hmux->pads_dynamic
&& hmux->enabled) {
for (i = 0; i < hmux->nr_pads_dynamic; i++) {
struct omap_device_pad *pad = hmux->pads_dynamic[i];
int val = -EINVAL;
val = pad->enable;
omap_mux_write(pad->partition, val,
pad->mux->reg_offset);
}
return;
}
/* Enabling or disabling of all pads */
for (i = 0; i < hmux->nr_pads; i++) {
struct omap_device_pad *pad = &hmux->pads[i];
int flags, val = -EINVAL;
flags = pad->flags;
switch (state) {
case _HWMOD_STATE_ENABLED:
val = pad->enable;
pr_debug("%s: Enabling %s %x\n", __func__,
pad->name, val);
break;
case _HWMOD_STATE_DISABLED:
/* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
if (flags & OMAP_DEVICE_PAD_REMUX)
val = pad->off;
else
val = OMAP_MUX_MODE7;
pr_debug("%s: Disabling %s %x\n", __func__,
pad->name, val);
break;
default:
/* Nothing to be done */
break;
};
if (val >= 0) {
omap_mux_write(pad->partition, val,
pad->mux->reg_offset);
pad->flags = flags;
}
}
if (state == _HWMOD_STATE_ENABLED)
hmux->enabled = true;
else
hmux->enabled = false;
}
#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 32
static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
{
struct omap_mux_partition *partition = s->private;
struct omap_mux_entry *e;
u8 omap_gen = omap_rev() >> 28;
list_for_each_entry(e, &partition->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(partition, m->reg_offset);
mode = val & OMAP_MUX_MODE7;
if (mode != 0)
seq_printf(s, "/* %s */\n", m->muxnames[mode]);
/*
* XXX: Might be revisited to support differences across
* same OMAP generation.
*/
seq_printf(s, "OMAP%d_MUX(%s, ", omap_gen, 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 struct omap_mux_partition *omap_mux_get_partition(struct omap_mux *mux)
{
struct omap_mux_partition *partition;
list_for_each_entry(partition, &mux_partitions, node) {
struct list_head *muxmodes = &partition->muxmodes;
struct omap_mux_entry *e;
list_for_each_entry(e, muxmodes, node) {
struct omap_mux *m = &e->mux;
if (m == mux)
return partition;
}
}
return NULL;
}
static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
{
struct omap_mux *m = s->private;
struct omap_mux_partition *partition;
const char *none = "NA";
u16 val;
int mode;
partition = omap_mux_get_partition(m);
if (!partition)
return 0;
val = omap_mux_read(partition, m->reg_offset);
mode = val & OMAP_MUX_MODE7;
seq_printf(s, "name: %s.%s (0x%08x/0x%03x = 0x%04x), b %s, t %s\n",
m->muxnames[0], m->muxnames[mode],
partition->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;
struct omap_mux_partition *partition;
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;
partition = omap_mux_get_partition(m);
if (!partition)
return -ENODEV;
omap_mux_write(partition, (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_create_entry(
struct omap_mux_partition *partition,
struct dentry *mux_dbg_dir)
{
struct omap_mux_entry *e;
list_for_each_entry(e, &partition->muxmodes, node) {
struct omap_mux *m = &e->mux;
(void)debugfs_create_file(m->muxnames[0], S_IWUSR, mux_dbg_dir,
m, &omap_mux_dbg_signal_fops);
}
}
static void __init omap_mux_dbg_init(void)
{
struct omap_mux_partition *partition;
static struct dentry *mux_dbg_board_dir;
mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
if (!mux_dbg_dir)
return;
mux_dbg_board_dir = debugfs_create_dir("board", mux_dbg_dir);
if (!mux_dbg_board_dir)
return;
list_for_each_entry(partition, &mux_partitions, node) {
omap_mux_dbg_create_entry(partition, mux_dbg_dir);
(void)debugfs_create_file(partition->name, S_IRUGO,
mux_dbg_board_dir, partition,
&omap_mux_dbg_board_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_partition *partition;
int ret;
list_for_each_entry(partition, &mux_partitions, node) {
struct omap_mux_entry *e, *tmp;
list_for_each_entry_safe(e, tmp, &partition->muxmodes, node) {
struct omap_mux *m = &e->mux;
u16 mode = omap_mux_read(partition, 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
}
}
ret = request_irq(omap_prcm_event_to_irq("io"),
omap_hwmod_mux_handle_irq, IRQF_SHARED | IRQF_NO_SUSPEND,
"hwmod_io", omap_mux_late_init);
if (ret)
pr_warning("mux: Failed to setup hwmod io irq %d\n", ret);
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)
pr_err("%s: Unknown entry offset 0x%x\n", __func__,
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)
pr_err("%s: Unknown ball offset 0x%x\n", __func__,
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 = kstrdup(omap_mux_options, GFP_KERNEL);
if (!options)
return;
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] = kstrdup(src->muxnames[i],
GFP_KERNEL);
if (!dst->muxnames[i])
goto free;
}
}
#ifdef CONFIG_DEBUG_FS
for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
if (src->balls[i]) {
dst->balls[i] = kstrdup(src->balls[i], GFP_KERNEL);
if (!dst->balls[i])
goto free;
}
}
#endif
return 0;
free:
omap_mux_free_names(dst);
return -ENOMEM;
}
#endif /* CONFIG_OMAP_MUX */
static struct omap_mux *omap_mux_get_by_gpio(
struct omap_mux_partition *partition,
int gpio)
{
struct omap_mux_entry *e;
struct omap_mux *ret = NULL;
list_for_each_entry(e, &partition->muxmodes, node) {
struct omap_mux *m = &e->mux;
if (m->gpio == gpio) {
ret = m;
break;
}
}
return ret;
}
/* Needed for dynamic muxing of GPIO pins for off-idle */
u16 omap_mux_get_gpio(int gpio)
{
struct omap_mux_partition *partition;
struct omap_mux *m = NULL;
list_for_each_entry(partition, &mux_partitions, node) {
m = omap_mux_get_by_gpio(partition, gpio);
if (m)
return omap_mux_read(partition, m->reg_offset);
}
if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
pr_err("%s: Could not get gpio%i\n", __func__, gpio);
return OMAP_MUX_TERMINATOR;
}
/* Needed for dynamic muxing of GPIO pins for off-idle */
void omap_mux_set_gpio(u16 val, int gpio)
{
struct omap_mux_partition *partition;
struct omap_mux *m = NULL;
list_for_each_entry(partition, &mux_partitions, node) {
m = omap_mux_get_by_gpio(partition, gpio);
if (m) {
omap_mux_write(partition, val, m->reg_offset);
return;
}
}
if (!m || m->reg_offset == OMAP_MUX_TERMINATOR)
pr_err("%s: Could not set gpio%i\n", __func__, gpio);
}
static struct omap_mux * __init omap_mux_list_add(
struct omap_mux_partition *partition,
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;
entry->mux = *src;
#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, &partition->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_partition *partition,
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(partition,
superset->reg_offset))) {
superset++;
continue;
}
#endif
entry = omap_mux_list_add(partition, superset);
if (!entry) {
pr_err("%s: Could not add entry\n", __func__);
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 __init omap_mux_init_signals(struct omap_mux_partition *partition,
struct omap_board_mux *board_mux)
{
omap_mux_set_cmdline_signals();
omap_mux_write_array(partition, 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 __init omap_mux_init_signals(struct omap_mux_partition *partition,
struct omap_board_mux *board_mux)
{
}
#endif
static u32 mux_partitions_cnt;
int __init omap_mux_init(const char *name, u32 flags,
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)
{
struct omap_mux_partition *partition;
partition = kzalloc(sizeof(struct omap_mux_partition), GFP_KERNEL);
if (!partition)
return -ENOMEM;
partition->name = name;
partition->flags = flags;
partition->size = mux_size;
partition->phys = mux_pbase;
partition->base = ioremap(mux_pbase, mux_size);
if (!partition->base) {
pr_err("%s: Could not ioremap mux partition at 0x%08x\n",
__func__, partition->phys);
kfree(partition);
return -ENODEV;
}
INIT_LIST_HEAD(&partition->muxmodes);
list_add_tail(&partition->node, &mux_partitions);
mux_partitions_cnt++;
pr_info("%s: Add partition: #%d: %s, flags: %x\n", __func__,
mux_partitions_cnt, partition->name, partition->flags);
omap_mux_init_package(superset, package_subset, package_balls);
omap_mux_init_list(partition, superset);
omap_mux_init_signals(partition, board_mux);
return 0;
}