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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>
This commit is contained in:
Tony Lindgren
parent
92c9f50189
commit
15ac7afe51
@ -1787,6 +1787,11 @@ and is between 256 and 4096 characters. It is defined in the file
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waiting for the ACK, so if this is set too high
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interrupts *may* be lost!
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omap_mux= [OMAP] Override bootloader pin multiplexing.
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Format: <mux_mode0.mode_name=value>...
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For example, to override I2C bus2:
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omap_mux=i2c2_scl.i2c2_scl=0x100,i2c2_sda.i2c2_sda=0x100
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opl3= [HW,OSS]
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Format: <io>
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@ -27,18 +27,23 @@
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <asm/system.h>
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#include <plat/control.h>
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#include <plat/mux.h>
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#ifdef CONFIG_OMAP_MUX
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#include "mux.h"
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#define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
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#define OMAP_MUX_BASE_SZ 0x5ca
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static struct omap_mux_cfg arch_mux_cfg;
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struct omap_mux_entry {
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struct omap_mux mux;
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struct list_head node;
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};
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static void __iomem *mux_base;
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static inline u16 omap_mux_read(u16 reg)
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@ -57,6 +62,10 @@ static inline void omap_mux_write(u16 val, u16 reg)
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__raw_writew(val, mux_base + reg);
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}
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#ifdef CONFIG_OMAP_MUX
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static struct omap_mux_cfg arch_mux_cfg;
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/* NOTE: See mux.h for the enumeration */
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#ifdef CONFIG_ARCH_OMAP24XX
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@ -667,8 +676,8 @@ int __init omap2_mux_init(void)
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mux_pbase = OMAP2420_CTRL_BASE + OMAP_MUX_BASE_OFFSET;
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else if (cpu_is_omap2430())
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mux_pbase = OMAP243X_CTRL_BASE + OMAP_MUX_BASE_OFFSET;
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else if (cpu_is_omap34xx())
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mux_pbase = OMAP343X_CTRL_BASE + OMAP_MUX_BASE_OFFSET;
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else
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return -ENODEV;
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mux_base = ioremap(mux_pbase, OMAP_MUX_BASE_SZ);
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if (!mux_base) {
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@ -689,4 +698,431 @@ int __init omap2_mux_init(void)
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return omap_mux_register(&arch_mux_cfg);
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}
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#endif /* CONFIG_OMAP_MUX */
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/*----------------------------------------------------------------------------*/
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#ifdef CONFIG_ARCH_OMAP34XX
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static LIST_HEAD(muxmodes);
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static DEFINE_MUTEX(muxmode_mutex);
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#ifdef CONFIG_OMAP_MUX
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static char *omap_mux_options;
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int __init omap_mux_init_gpio(int gpio, int val)
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{
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struct omap_mux_entry *e;
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int found = 0;
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if (!gpio)
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return -EINVAL;
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list_for_each_entry(e, &muxmodes, node) {
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struct omap_mux *m = &e->mux;
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if (gpio == m->gpio) {
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u16 old_mode;
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u16 mux_mode;
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old_mode = omap_mux_read(m->reg_offset);
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mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
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mux_mode |= OMAP_MUX_MODE4;
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printk(KERN_DEBUG "mux: Setting signal "
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"%s.gpio%i 0x%04x -> 0x%04x\n",
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m->muxnames[0], gpio, old_mode, mux_mode);
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omap_mux_write(mux_mode, m->reg_offset);
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found++;
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}
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}
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if (found == 1)
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return 0;
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if (found > 1) {
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printk(KERN_ERR "mux: Multiple gpio paths for gpio%i\n", gpio);
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return -EINVAL;
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}
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printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
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return -ENODEV;
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}
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int __init omap_mux_init_signal(char *muxname, int val)
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{
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struct omap_mux_entry *e;
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char *m0_name = NULL, *mode_name = NULL;
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int found = 0;
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mode_name = strchr(muxname, '.');
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if (mode_name) {
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*mode_name = '\0';
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mode_name++;
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m0_name = muxname;
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} else {
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mode_name = muxname;
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}
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list_for_each_entry(e, &muxmodes, node) {
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struct omap_mux *m = &e->mux;
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char *m0_entry = m->muxnames[0];
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int i;
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if (m0_name && strcmp(m0_name, m0_entry))
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continue;
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for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
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char *mode_cur = m->muxnames[i];
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if (!mode_cur)
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continue;
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if (!strcmp(mode_name, mode_cur)) {
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u16 old_mode;
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u16 mux_mode;
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old_mode = omap_mux_read(m->reg_offset);
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mux_mode = val | i;
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printk(KERN_DEBUG "mux: Setting signal "
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"%s.%s 0x%04x -> 0x%04x\n",
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m0_entry, muxname, old_mode, mux_mode);
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omap_mux_write(mux_mode, m->reg_offset);
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found++;
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}
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}
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}
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if (found == 1)
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return 0;
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if (found > 1) {
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printk(KERN_ERR "mux: Multiple signal paths (%i) for %s\n",
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found, muxname);
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return -EINVAL;
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}
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printk(KERN_ERR "mux: Could not set signal %s\n", muxname);
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return -ENODEV;
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}
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static void __init omap_mux_free_names(struct omap_mux *m)
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{
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int i;
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for (i = 0; i < OMAP_MUX_NR_MODES; i++)
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kfree(m->muxnames[i]);
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#ifdef CONFIG_DEBUG_FS
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for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
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kfree(m->balls[i]);
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#endif
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}
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/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
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static int __init omap_mux_late_init(void)
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{
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struct omap_mux_entry *e, *tmp;
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list_for_each_entry_safe(e, tmp, &muxmodes, node) {
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struct omap_mux *m = &e->mux;
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u16 mode = omap_mux_read(m->reg_offset);
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if (OMAP_MODE_GPIO(mode))
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continue;
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#ifndef CONFIG_DEBUG_FS
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mutex_lock(&muxmode_mutex);
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list_del(&e->node);
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mutex_unlock(&muxmode_mutex);
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omap_mux_free_names(m);
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kfree(m);
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#endif
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}
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return 0;
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}
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late_initcall(omap_mux_late_init);
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static void __init omap_mux_package_fixup(struct omap_mux *p,
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struct omap_mux *superset)
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{
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while (p->reg_offset != OMAP_MUX_TERMINATOR) {
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struct omap_mux *s = superset;
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int found = 0;
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while (s->reg_offset != OMAP_MUX_TERMINATOR) {
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if (s->reg_offset == p->reg_offset) {
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*s = *p;
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found++;
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break;
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}
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s++;
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}
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if (!found)
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printk(KERN_ERR "mux: Unknown entry offset 0x%x\n",
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p->reg_offset);
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p++;
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}
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}
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#ifdef CONFIG_DEBUG_FS
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static void __init omap_mux_package_init_balls(struct omap_ball *b,
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struct omap_mux *superset)
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{
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while (b->reg_offset != OMAP_MUX_TERMINATOR) {
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struct omap_mux *s = superset;
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int found = 0;
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while (s->reg_offset != OMAP_MUX_TERMINATOR) {
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if (s->reg_offset == b->reg_offset) {
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s->balls[0] = b->balls[0];
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s->balls[1] = b->balls[1];
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found++;
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break;
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}
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s++;
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}
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if (!found)
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printk(KERN_ERR "mux: Unknown ball offset 0x%x\n",
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b->reg_offset);
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b++;
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}
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}
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#else /* CONFIG_DEBUG_FS */
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static inline void omap_mux_package_init_balls(struct omap_ball *b,
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struct omap_mux *superset)
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{
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}
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#endif /* CONFIG_DEBUG_FS */
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static int __init omap_mux_setup(char *options)
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{
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if (!options)
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return 0;
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omap_mux_options = options;
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return 1;
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}
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__setup("omap_mux=", omap_mux_setup);
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/*
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* Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
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* cmdline options only override the bootloader values.
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* During development, please enable CONFIG_DEBUG_FS, and use the
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* signal specific entries under debugfs.
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*/
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static void __init omap_mux_set_cmdline_signals(void)
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{
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char *options, *next_opt, *token;
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if (!omap_mux_options)
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return;
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options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
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if (!options)
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return;
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strcpy(options, omap_mux_options);
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next_opt = options;
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while ((token = strsep(&next_opt, ",")) != NULL) {
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char *keyval, *name;
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unsigned long val;
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keyval = token;
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name = strsep(&keyval, "=");
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if (name) {
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int res;
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res = strict_strtoul(keyval, 0x10, &val);
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if (res < 0)
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continue;
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omap_mux_init_signal(name, (u16)val);
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}
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}
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kfree(options);
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}
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static void __init omap_mux_set_board_signals(struct omap_board_mux *board_mux)
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{
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while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
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omap_mux_write(board_mux->value, board_mux->reg_offset);
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board_mux++;
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}
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}
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static int __init omap_mux_copy_names(struct omap_mux *src,
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struct omap_mux *dst)
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{
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int i;
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for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
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if (src->muxnames[i]) {
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dst->muxnames[i] =
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kmalloc(strlen(src->muxnames[i]) + 1,
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GFP_KERNEL);
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if (!dst->muxnames[i])
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goto free;
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strcpy(dst->muxnames[i], src->muxnames[i]);
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}
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}
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#ifdef CONFIG_DEBUG_FS
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for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
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if (src->balls[i]) {
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dst->balls[i] =
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kmalloc(strlen(src->balls[i]) + 1,
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GFP_KERNEL);
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if (!dst->balls[i])
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goto free;
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strcpy(dst->balls[i], src->balls[i]);
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}
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}
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#endif
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return 0;
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free:
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omap_mux_free_names(dst);
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return -ENOMEM;
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}
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#endif /* CONFIG_OMAP_MUX */
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static u16 omap_mux_get_by_gpio(int gpio)
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{
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struct omap_mux_entry *e;
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u16 offset = OMAP_MUX_TERMINATOR;
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list_for_each_entry(e, &muxmodes, node) {
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struct omap_mux *m = &e->mux;
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if (m->gpio == gpio) {
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offset = m->reg_offset;
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break;
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}
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}
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return offset;
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}
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/* Needed for dynamic muxing of GPIO pins for off-idle */
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u16 omap_mux_get_gpio(int gpio)
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{
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u16 offset;
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offset = omap_mux_get_by_gpio(gpio);
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if (offset == OMAP_MUX_TERMINATOR) {
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printk(KERN_ERR "mux: Could not get gpio%i\n", gpio);
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return offset;
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}
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return omap_mux_read(offset);
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}
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/* Needed for dynamic muxing of GPIO pins for off-idle */
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void omap_mux_set_gpio(u16 val, int gpio)
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{
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u16 offset;
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offset = omap_mux_get_by_gpio(gpio);
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if (offset == OMAP_MUX_TERMINATOR) {
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printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
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return;
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}
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omap_mux_write(val, offset);
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}
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static struct omap_mux * __init omap_mux_list_add(struct omap_mux *src)
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{
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struct omap_mux_entry *entry;
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struct omap_mux *m;
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entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
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if (!entry)
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return NULL;
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m = &entry->mux;
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memcpy(m, src, sizeof(struct omap_mux_entry));
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#ifdef CONFIG_OMAP_MUX
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if (omap_mux_copy_names(src, m)) {
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kfree(entry);
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return NULL;
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}
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#endif
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mutex_lock(&muxmode_mutex);
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list_add_tail(&entry->node, &muxmodes);
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mutex_unlock(&muxmode_mutex);
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return m;
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}
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/*
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* Note if CONFIG_OMAP_MUX is not selected, we will only initialize
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* the GPIO to mux offset mapping that is needed for dynamic muxing
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* of GPIO pins for off-idle.
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*/
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static void __init omap_mux_init_list(struct omap_mux *superset)
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{
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while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
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struct omap_mux *entry;
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#ifndef CONFIG_OMAP_MUX
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/* Skip pins that are not muxed as GPIO by bootloader */
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if (!OMAP_MODE_GPIO(omap_mux_read(superset->reg_offset))) {
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superset++;
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continue;
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}
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#endif
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entry = omap_mux_list_add(superset);
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if (!entry) {
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printk(KERN_ERR "mux: Could not add entry\n");
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return;
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}
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superset++;
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}
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}
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int __init omap_mux_init(u32 mux_pbase, u32 mux_size,
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struct omap_mux *superset,
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struct omap_mux *package_subset,
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struct omap_board_mux *board_mux,
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struct omap_ball *package_balls)
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{
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if (mux_base)
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return -EBUSY;
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mux_base = ioremap(mux_pbase, mux_size);
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if (!mux_base) {
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printk(KERN_ERR "mux: Could not ioremap\n");
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return -ENODEV;
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}
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#ifdef CONFIG_OMAP_MUX
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omap_mux_package_fixup(package_subset, superset);
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omap_mux_package_init_balls(package_balls, superset);
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omap_mux_set_cmdline_signals();
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omap_mux_set_board_signals(board_mux);
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#endif
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omap_mux_init_list(superset);
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return 0;
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}
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#endif /* CONFIG_ARCH_OMAP34XX */
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160
arch/arm/mach-omap2/mux.h
Normal file
160
arch/arm/mach-omap2/mux.h
Normal file
@ -0,0 +1,160 @@
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/*
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||||
* Copyright (C) 2009 Nokia
|
||||
* Copyright (C) 2009 Texas Instruments
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#define OMAP_MUX_TERMINATOR 0xffff
|
||||
|
||||
/* 34xx mux mode options for each pin. See TRM for options */
|
||||
#define OMAP_MUX_MODE0 0
|
||||
#define OMAP_MUX_MODE1 1
|
||||
#define OMAP_MUX_MODE2 2
|
||||
#define OMAP_MUX_MODE3 3
|
||||
#define OMAP_MUX_MODE4 4
|
||||
#define OMAP_MUX_MODE5 5
|
||||
#define OMAP_MUX_MODE6 6
|
||||
#define OMAP_MUX_MODE7 7
|
||||
|
||||
/* 24xx/34xx mux bit defines */
|
||||
#define OMAP_PULL_ENA (1 << 3)
|
||||
#define OMAP_PULL_UP (1 << 4)
|
||||
#define OMAP_ALTELECTRICALSEL (1 << 5)
|
||||
|
||||
/* 34xx specific mux bit defines */
|
||||
#define OMAP_INPUT_EN (1 << 8)
|
||||
#define OMAP_OFF_EN (1 << 9)
|
||||
#define OMAP_OFFOUT_EN (1 << 10)
|
||||
#define OMAP_OFFOUT_VAL (1 << 11)
|
||||
#define OMAP_OFF_PULL_EN (1 << 12)
|
||||
#define OMAP_OFF_PULL_UP (1 << 13)
|
||||
#define OMAP_WAKEUP_EN (1 << 14)
|
||||
|
||||
/* Active pin states */
|
||||
#define OMAP_PIN_OUTPUT 0
|
||||
#define OMAP_PIN_INPUT OMAP_INPUT_EN
|
||||
#define OMAP_PIN_INPUT_PULLUP (OMAP_PULL_ENA | OMAP_INPUT_EN \
|
||||
| OMAP_PULL_UP)
|
||||
#define OMAP_PIN_INPUT_PULLDOWN (OMAP_PULL_ENA | OMAP_INPUT_EN)
|
||||
|
||||
/* Off mode states */
|
||||
#define OMAP_PIN_OFF_NONE 0
|
||||
#define OMAP_PIN_OFF_OUTPUT_HIGH (OMAP_OFF_EN | OMAP_OFFOUT_EN \
|
||||
| OMAP_OFFOUT_VAL)
|
||||
#define OMAP_PIN_OFF_OUTPUT_LOW (OMAP_OFF_EN | OMAP_OFFOUT_EN)
|
||||
#define OMAP_PIN_OFF_INPUT_PULLUP (OMAP_OFF_EN | OMAP_OFF_PULL_EN \
|
||||
| OMAP_OFF_PULL_UP)
|
||||
#define OMAP_PIN_OFF_INPUT_PULLDOWN (OMAP_OFF_EN | OMAP_OFF_PULL_EN)
|
||||
#define OMAP_PIN_OFF_WAKEUPENABLE OMAP_WAKEUP_EN
|
||||
|
||||
#define OMAP_MODE_GPIO(x) (((x) & OMAP_MUX_MODE7) == OMAP_MUX_MODE4)
|
||||
|
||||
/* Flags for omap_mux_init */
|
||||
#define OMAP_PACKAGE_MASK 0xffff
|
||||
#define OMAP_PACKAGE_CUS 3 /* 423-pin 0.65 */
|
||||
#define OMAP_PACKAGE_CBB 2 /* 515-pin 0.40 0.50 */
|
||||
#define OMAP_PACKAGE_CBC 1 /* 515-pin 0.50 0.65 */
|
||||
|
||||
|
||||
#define OMAP_MUX_NR_MODES 8 /* Available modes */
|
||||
#define OMAP_MUX_NR_SIDES 2 /* Bottom & top */
|
||||
|
||||
/**
|
||||
* struct omap_mux - data for omap mux register offset and it's value
|
||||
* @reg_offset: mux register offset from the mux base
|
||||
* @gpio: GPIO number
|
||||
* @muxnames: available signal modes for a ball
|
||||
*/
|
||||
struct omap_mux {
|
||||
u16 reg_offset;
|
||||
u16 gpio;
|
||||
#ifdef CONFIG_OMAP_MUX
|
||||
char *muxnames[OMAP_MUX_NR_MODES];
|
||||
#ifdef CONFIG_DEBUG_FS
|
||||
char *balls[OMAP_MUX_NR_SIDES];
|
||||
#endif
|
||||
#endif
|
||||
};
|
||||
|
||||
/**
|
||||
* struct omap_ball - data for balls on omap package
|
||||
* @reg_offset: mux register offset from the mux base
|
||||
* @balls: available balls on the package
|
||||
*/
|
||||
struct omap_ball {
|
||||
u16 reg_offset;
|
||||
char *balls[OMAP_MUX_NR_SIDES];
|
||||
};
|
||||
|
||||
/**
|
||||
* struct omap_board_mux - data for initializing mux registers
|
||||
* @reg_offset: mux register offset from the mux base
|
||||
* @mux_value: desired mux value to set
|
||||
*/
|
||||
struct omap_board_mux {
|
||||
u16 reg_offset;
|
||||
u16 value;
|
||||
};
|
||||
|
||||
#if defined(CONFIG_OMAP_MUX) && defined(CONFIG_ARCH_OMAP34XX)
|
||||
|
||||
/**
|
||||
* omap_mux_init_gpio - initialize a signal based on the GPIO number
|
||||
* @gpio: GPIO number
|
||||
* @val: Options for the mux register value
|
||||
*/
|
||||
int omap_mux_init_gpio(int gpio, int val);
|
||||
|
||||
/**
|
||||
* omap_mux_init_signal - initialize a signal based on the signal name
|
||||
* @muxname: Mux name in mode0_name.signal_name format
|
||||
* @val: Options for the mux register value
|
||||
*/
|
||||
int omap_mux_init_signal(char *muxname, int val);
|
||||
|
||||
#else
|
||||
|
||||
static inline int omap_mux_init_gpio(int gpio, int val)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
static inline int omap_mux_init_signal(char *muxname, int val)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/**
|
||||
* omap_mux_get_gpio() - get mux register value based on GPIO number
|
||||
* @gpio: GPIO number
|
||||
*
|
||||
*/
|
||||
u16 omap_mux_get_gpio(int gpio);
|
||||
|
||||
/**
|
||||
* omap_mux_set_gpio() - set mux register value based on GPIO number
|
||||
* @val: New mux register value
|
||||
* @gpio: GPIO number
|
||||
*
|
||||
*/
|
||||
void omap_mux_set_gpio(u16 val, int gpio);
|
||||
|
||||
/**
|
||||
* omap3_mux_init() - initialize mux system with board specific set
|
||||
* @board_mux: Board specific mux table
|
||||
* @flags: OMAP package type used for the board
|
||||
*/
|
||||
int omap3_mux_init(struct omap_board_mux *board_mux, int flags);
|
||||
|
||||
/**
|
||||
* omap_mux_init - private mux init function, do not call
|
||||
*/
|
||||
int 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);
|
||||
@ -54,8 +54,12 @@ int __init_or_module omap_cfg_reg(const unsigned long index)
|
||||
{
|
||||
struct pin_config *reg;
|
||||
|
||||
if (cpu_is_omap44xx())
|
||||
return 0;
|
||||
if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
|
||||
printk(KERN_ERR "mux: Broken omap_cfg_reg(%lu) entry\n",
|
||||
index);
|
||||
WARN_ON(1);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (mux_cfg == NULL) {
|
||||
printk(KERN_ERR "Pin mux table not initialized\n");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user