diff options
Diffstat (limited to 'kernel/arch/arm/mach-omap2/mux.c')
| -rw-r--r-- | kernel/arch/arm/mach-omap2/mux.c | 1153 |
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; +} + |