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authorTony Lindgren <tony@atomide.com>2009-12-11 16:16:32 -0800
committerTony Lindgren <tony@atomide.com>2009-12-11 16:16:32 -0800
commit15ac7afe515631ec36966b1cf632a87276536f57 (patch)
tree68fae5c0154ccf441468569c0d763b32c3b90f21 /arch/arm/mach-omap2/mux.c
parent92c9f5018997dbc5f5e91eae2400d78ada2760b0 (diff)
downloadop-kernel-dev-15ac7afe515631ec36966b1cf632a87276536f57.zip
op-kernel-dev-15ac7afe515631ec36966b1cf632a87276536f57.tar.gz
omap: mux: Add new style pin multiplexing code for omap3
Initially only for 34xx. This code allows us to: - Make the code more generic as the omap internal signal names can stay the same across omap generations for some devices - Map mux registers to GPIO registers that is needed for dynamic muxing of pins during off-idle - Override bootloader mux values via kernel cmdline using omap_mux=some.signa1=0x1234,some.signal2=0x1234 - View and set the mux registers via debugfs if CONFIG_DEBUG_FS is enabled Cc: Mike Rapoport <mike@compulab.co.il> Cc: Benoit Cousson <b-cousson@ti.com> Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/mux.c')
-rw-r--r--arch/arm/mach-omap2/mux.c444
1 files changed, 440 insertions, 4 deletions
diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
index 64250c5..b082b50 100644
--- a/arch/arm/mach-omap2/mux.c
+++ b/arch/arm/mach-omap2/mux.c
@@ -27,18 +27,23 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/spinlock.h>
+#include <linux/list.h>
#include <asm/system.h>
#include <plat/control.h>
#include <plat/mux.h>
-#ifdef CONFIG_OMAP_MUX
+#include "mux.h"
#define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
#define OMAP_MUX_BASE_SZ 0x5ca
-static struct omap_mux_cfg arch_mux_cfg;
+struct omap_mux_entry {
+ struct omap_mux mux;
+ struct list_head node;
+};
+
static void __iomem *mux_base;
static inline u16 omap_mux_read(u16 reg)
@@ -57,6 +62,10 @@ static inline void omap_mux_write(u16 val, u16 reg)
__raw_writew(val, mux_base + reg);
}
+#ifdef CONFIG_OMAP_MUX
+
+static struct omap_mux_cfg arch_mux_cfg;
+
/* NOTE: See mux.h for the enumeration */
#ifdef CONFIG_ARCH_OMAP24XX
@@ -667,8 +676,8 @@ int __init omap2_mux_init(void)
mux_pbase = OMAP2420_CTRL_BASE + OMAP_MUX_BASE_OFFSET;
else if (cpu_is_omap2430())
mux_pbase = OMAP243X_CTRL_BASE + OMAP_MUX_BASE_OFFSET;
- else if (cpu_is_omap34xx())
- mux_pbase = OMAP343X_CTRL_BASE + OMAP_MUX_BASE_OFFSET;
+ else
+ return -ENODEV;
mux_base = ioremap(mux_pbase, OMAP_MUX_BASE_SZ);
if (!mux_base) {
@@ -689,4 +698,431 @@ int __init omap2_mux_init(void)
return omap_mux_register(&arch_mux_cfg);
}
+#endif /* CONFIG_OMAP_MUX */
+
+/*----------------------------------------------------------------------------*/
+
+#ifdef CONFIG_ARCH_OMAP34XX
+
+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;
+ int found = 0;
+
+ if (!gpio)
+ return -EINVAL;
+
+ list_for_each_entry(e, &muxmodes, node) {
+ struct omap_mux *m = &e->mux;
+ if (gpio == m->gpio) {
+ u16 old_mode;
+ u16 mux_mode;
+
+ old_mode = omap_mux_read(m->reg_offset);
+ mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
+ mux_mode |= OMAP_MUX_MODE4;
+ printk(KERN_DEBUG "mux: Setting signal "
+ "%s.gpio%i 0x%04x -> 0x%04x\n",
+ m->muxnames[0], gpio, 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 gpio paths for gpio%i\n", gpio);
+ return -EINVAL;
+ }
+
+ printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
+
+ return -ENODEV;
+}
+
+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;
+}
+
+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
+
+ }
+
+ 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 void __init omap_mux_set_board_signals(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 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;
+
+#ifndef CONFIG_OMAP_MUX
+ /* 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++;
+ }
+}
+
+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_base = ioremap(mux_pbase, mux_size);
+ if (!mux_base) {
+ printk(KERN_ERR "mux: Could not ioremap\n");
+ return -ENODEV;
+ }
+
+#ifdef CONFIG_OMAP_MUX
+ omap_mux_package_fixup(package_subset, superset);
+ omap_mux_package_init_balls(package_balls, superset);
+ omap_mux_set_cmdline_signals();
+ omap_mux_set_board_signals(board_mux);
+#endif
+
+ omap_mux_init_list(superset);
+
+ return 0;
+}
+
+#endif /* CONFIG_ARCH_OMAP34XX */
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