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-rw-r--r--kernel/arch/arm/mach-omap2/mux.c1153
1 files changed, 1153 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/mux.c b/kernel/arch/arm/mach-omap2/mux.c
new file mode 100644
index 000000000..176eef6ef
--- /dev/null
+++ b/kernel/arch/arm/mach-omap2/mux.c
@@ -0,0 +1,1153 @@
+/*
+ * 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 "omap_hwmod.h"
+
+#include "soc.h"
+#include "control.h"
+#include "mux.h"
+#include "prm.h"
+#include "common.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 readb_relaxed(partition->base + reg);
+ else
+ return readw_relaxed(partition->base + reg);
+}
+
+void omap_mux_write(struct omap_mux_partition *partition, u16 val,
+ u16 reg)
+{
+ if (partition->flags & OMAP_MUX_REG_8BIT)
+ writeb_relaxed(val, partition->base + reg);
+ else
+ writew_relaxed(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 __init _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);
+ mux_mode |= partition->gpio;
+ 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 __init 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 __init _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)
+ if (strncmp(muxname, m0_entry, mode0_len) ||
+ (strlen(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;
+ }
+
+ return -ENODEV;
+}
+
+int __init 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;
+ }
+
+ pr_err("%s: Could not find signal %s\n", __func__, muxname);
+
+ return -ENODEV;
+}
+
+int __init 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 || !mux)
+ 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)
+{
+ struct seq_file *seqf;
+ struct omap_mux *m;
+ u16 val;
+ int ret;
+ struct omap_mux_partition *partition;
+
+ if (count > OMAP_MUX_MAX_ARG_CHAR)
+ return -EINVAL;
+
+ ret = kstrtou16_from_user(user_buf, count, 0x10, &val);
+ if (ret < 0)
+ return ret;
+
+ seqf = file->private_data;
+ m = seqf->private;
+
+ partition = omap_mux_get_partition(m);
+ if (!partition)
+ return -ENODEV;
+
+ omap_mux_write(partition, 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 | S_IRUGO,
+ 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 */
+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(partition, 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();
+
+ /* see pinctrl-single-omap for the wake-up interrupt handling */
+ if (of_have_populated_dt())
+ return 0;
+
+ 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_warn("mux: Failed to setup hwmod io irq %d\n", ret);
+
+ return 0;
+}
+
+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;
+ u16 val;
+
+ keyval = token;
+ name = strsep(&keyval, "=");
+ if (name) {
+ int res;
+
+ res = kstrtou16(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[0]) {
+ superset++;
+ continue;
+ }
+#else
+ /* Skip pins that are not muxed as GPIO by bootloader */
+ if (!OMAP_MODE_GPIO(partition, 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->gpio = flags & OMAP_MUX_MODE7;
+ 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;
+}
+