From: Paul Walmsley <paul@xxxxxxxxx>
This patch creates an interface to the powerdomain registers in the
PRM/CM modules on OMAP2/3. This interface is intended to be used by
PM code, e.g., pm.c; not by device drivers directly.
Each powerdomain will be defined in later patches as static
structures. Also defined are dependencies between powerdomains,
used for adding and removing PM_WKDEP and CM_SLEEPDEP bits. The
powerdomain structures are linked into a list at boot by
pwrdm_register(), similar to the OMAP clock code.
The patch adds a Kconfig option, CONFIG_OMAP_DEBUG_POWERDOMAIN, which
when enabled will emit verbose debug messages via pr_debug().
Signed-off-by: Paul Walmsley <paul@xxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 93ee990..1001d42 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -4,7 +4,7 @@
# Common support
obj-y := irq.o id.o io.o memory.o control.o prcm.o clock.o mux.o \
- devices.o serial.o gpmc.o timer-gp.o
+ devices.o serial.o gpmc.o timer-gp.o powerdomain.o
obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 4263099..b008d35 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -62,11 +62,14 @@ static void omap3_dpll_recalc(struct clk *clk)
static void _omap3_dpll_write_clken(struct clk *clk, u8 clken_bits)
{
const struct dpll_data *dd;
+ u32 v;
dd = clk->dpll_data;
- cm_rmw_reg_bits(dd->enable_mask, clken_bits << __ffs(dd->enable_mask),
- dd->control_reg);
+ v = __raw_readl(dd->control_reg);
+ v &= ~dd->enable_mask;
+ v |= clken_bits << __ffs(dd->enable_mask);
+ __raw_writel(v, dd->control_reg);
}
/* _omap3_wait_dpll_status: wait for a DPLL to enter a specific state */
@@ -82,7 +85,7 @@ static int _omap3_wait_dpll_status(struct clk *clk, u8 state)
state <<= dd->idlest_bit;
idlest_mask = 1 << dd->idlest_bit;
- while (((cm_read_reg(dd->idlest_reg) & idlest_mask) != state) &&
+ while (((__raw_readl(dd->idlest_reg) & idlest_mask) != state) &&
i < MAX_DPLL_WAIT_TRIES) {
i++;
udelay(1);
@@ -285,7 +288,7 @@ static u32 omap3_dpll_autoidle_read(struct clk *clk)
dd = clk->dpll_data;
- v = cm_read_reg(dd->autoidle_reg);
+ v = __raw_readl(dd->autoidle_reg);
v &= dd->autoidle_mask;
v >>= __ffs(dd->autoidle_mask);
@@ -304,6 +307,7 @@ static u32 omap3_dpll_autoidle_read(struct clk *clk)
static void omap3_dpll_allow_idle(struct clk *clk)
{
const struct dpll_data *dd;
+ u32 v;
if (!clk || !clk->dpll_data)
return;
@@ -315,9 +319,10 @@ static void omap3_dpll_allow_idle(struct clk *clk)
* by writing 0x5 instead of 0x1. Add some mechanism to
* optionally enter this mode.
*/
- cm_rmw_reg_bits(dd->autoidle_mask,
- DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask),
- dd->autoidle_reg);
+ v = __raw_readl(dd->autoidle_reg);
+ v &= ~dd->autoidle_mask;
+ v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask);
+ __raw_writel(v, dd->autoidle_reg);
}
/**
@@ -329,15 +334,17 @@ static void omap3_dpll_allow_idle(struct clk *clk)
static void omap3_dpll_deny_idle(struct clk *clk)
{
const struct dpll_data *dd;
+ u32 v;
if (!clk || !clk->dpll_data)
return;
dd = clk->dpll_data;
- cm_rmw_reg_bits(dd->autoidle_mask,
- DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask),
- dd->autoidle_reg);
+ v = __raw_readl(dd->autoidle_reg);
+ v &= ~dd->autoidle_mask;
+ v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask);
+ __raw_writel(v, dd->autoidle_reg);
}
/* Clock control for DPLL outputs */
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
new file mode 100644
index 0000000..2ae419e
--- /dev/null
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -0,0 +1,909 @@
+/*
+ * OMAP powerdomain control
+ *
+ * Copyright (C) 2007-2008 Texas Instruments, Inc.
+ * Copyright (C) 2007-2008 Nokia Corporation
+ *
+ * Written by Paul Walmsley
+ *
+ * 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.
+ */
+#ifdef CONFIG_OMAP_DEBUG_POWERDOMAIN
+# define DEBUG
+#endif
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <asm/atomic.h>
+
+#include "cm.h"
+#include "cm-regbits-34xx.h"
+#include "prm.h"
+#include "prm-regbits-34xx.h"
+
+#include <asm/arch/cpu.h>
+#include <asm/arch/powerdomain.h>
+
+/* pwrdm_list contains all registered struct powerdomains */
+static LIST_HEAD(pwrdm_list);
+
+/*
+ * pwrdm_rwlock protects pwrdm_list add and del ops - also reused to
+ * protect pwrdm_clkdms[] during clkdm add/del ops
+ */
+static DEFINE_RWLOCK(pwrdm_rwlock);
+
+
+/* Private functions */
+
+static u32 prm_read_mod_bits_shift(s16 domain, s16 idx, u32 mask)
+{
+ u32 v;
+
+ v = prm_read_mod_reg(domain, idx);
+ v &= mask;
+ v >>= __ffs(mask);
+
+ return v;
+}
+
+static struct powerdomain *_pwrdm_lookup(const char *name)
+{
+ struct powerdomain *pwrdm, *temp_pwrdm;
+
+ pwrdm = NULL;
+
+ list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
+ if (!strcmp(name, temp_pwrdm->name)) {
+ pwrdm = temp_pwrdm;
+ break;
+ }
+ }
+
+ return pwrdm;
+}
+
+/* _pwrdm_deps_lookup - look up the specified powerdomain in a pwrdm list */
+static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm,
+ struct pwrdm_dep *deps)
+{
+ struct pwrdm_dep *pd;
+
+ if (!pwrdm || !deps || !omap_chip_is(pwrdm->omap_chip))
+ return ERR_PTR(-EINVAL);
+
+ for (pd = deps; pd; pd++) {
+
+ if (!omap_chip_is(pd->omap_chip))
+ continue;
+
+ if (!pd->pwrdm && pd->pwrdm_name)
+ pd->pwrdm = pwrdm_lookup(pd->pwrdm_name);
+
+ if (pd->pwrdm == pwrdm)
+ break;
+
+ }
+
+ if (!pd)
+ return ERR_PTR(-ENOENT);
+
+ return pd->pwrdm;
+}
+
+
+/* Public functions */
+
+/**
+ * pwrdm_init - set up the powerdomain layer
+ *
+ * Loop through the list of powerdomains, registering all that are
+ * available on the current CPU. If pwrdm_list is supplied and not
+ * null, all of the referenced powerdomains will be registered. No
+ * return value.
+ */
+void pwrdm_init(struct powerdomain **pwrdm_list)
+{
+ struct powerdomain **p = NULL;
+
+ if (pwrdm_list)
+ for (p = pwrdm_list; *p; p++)
+ pwrdm_register(*p);
+}
+
+/**
+ * pwrdm_register - register a powerdomain
+ * @pwrdm: struct powerdomain * to register
+ *
+ * Adds a powerdomain to the internal powerdomain list. Returns
+ * -EINVAL if given a null pointer, -EEXIST if a powerdomain is
+ * already registered by the provided name, or 0 upon success.
+ */
+int pwrdm_register(struct powerdomain *pwrdm)
+{
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (!omap_chip_is(pwrdm->omap_chip))
+ return -EINVAL;
+
+ write_lock_irqsave(&pwrdm_rwlock, flags);
+ if (_pwrdm_lookup(pwrdm->name)) {
+ ret = -EEXIST;
+ goto pr_unlock;
+ }
+
+ list_add(&pwrdm->node, &pwrdm_list);
+
+ pr_debug("powerdomain: registered %s\n", pwrdm->name);
+ ret = 0;
+
+pr_unlock:
+ write_unlock_irqrestore(&pwrdm_rwlock, flags);
+
+ return ret;
+}
+
+/**
+ * pwrdm_unregister - unregister a powerdomain
+ * @pwrdm: struct powerdomain * to unregister
+ *
+ * Removes a powerdomain from the internal powerdomain list. Returns
+ * -EINVAL if pwrdm argument is NULL.
+ */
+int pwrdm_unregister(struct powerdomain *pwrdm)
+{
+ unsigned long flags;
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ write_lock_irqsave(&pwrdm_rwlock, flags);
+ list_del(&pwrdm->node);
+ write_unlock_irqrestore(&pwrdm_rwlock, flags);
+
+ pr_debug("powerdomain: unregistered %s\n", pwrdm->name);
+
+ return 0;
+}
+
+/**
+ * pwrdm_lookup - look up a powerdomain by name, return a pointer
+ * @name: name of powerdomain
+ *
+ * Find a registered powerdomain by its name. Returns a pointer to the
+ * struct powerdomain if found, or NULL otherwise.
+ */
+struct powerdomain *pwrdm_lookup(const char *name)
+{
+ struct powerdomain *pwrdm;
+ unsigned long flags;
+
+ if (!name)
+ return NULL;
+
+ read_lock_irqsave(&pwrdm_rwlock, flags);
+ pwrdm = _pwrdm_lookup(name);
+ read_unlock_irqrestore(&pwrdm_rwlock, flags);
+
+ return pwrdm;
+}
+
+/**
+ * pwrdm_for_each - call function on each registered clockdomain
+ * @fn: callback function *
+ *
+ * Call the supplied function for each registered powerdomain. The
+ * callback function can return anything but 0 to bail out early from
+ * the iterator. The callback function is called with the pwrdm_rwlock
+ * held for reading, so no powerdomain structure manipulation
+ * functions should be called from the callback, although hardware
+ * powerdomain control functions are fine. Returns the last return
+ * value of the callback function, which should be 0 for success or
+ * anything else to indicate failure; or -EINVAL if the function
+ * pointer is null.
+ */
+int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm))
+{
+ struct powerdomain *temp_pwrdm;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!fn)
+ return -EINVAL;
+
+ read_lock_irqsave(&pwrdm_rwlock, flags);
+ list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
+ ret = (*fn)(temp_pwrdm);
+ if (ret)
+ break;
+ }
+ read_unlock_irqrestore(&pwrdm_rwlock, flags);
+
+ return ret;
+}
+
+/**
+ * pwrdm_add_wkdep - add a wakeup dependency from pwrdm2 to pwrdm1
+ * @pwrdm1: wake this struct powerdomain * up (dependent)
+ * @pwrdm2: when this struct powerdomain * wakes up (source)
+ *
+ * When the powerdomain represented by pwrdm2 wakes up (due to an
+ * interrupt), wake up pwrdm1. Implemented in hardware on the OMAP,
+ * this feature is designed to reduce wakeup latency of the dependent
+ * powerdomain. Returns -EINVAL if presented with invalid powerdomain
+ * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or
+ * 0 upon success.
+ */
+int pwrdm_add_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
+{
+ struct powerdomain *p;
+
+ if (!pwrdm1)
+ return -EINVAL;
+
+ p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
+ if (IS_ERR(p)) {
+ pr_debug("powerdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
+ return IS_ERR(p);
+ }
+
+ pr_debug("powerdomain: hardware will wake up %s when %s wakes up\n",
+ pwrdm1->name, pwrdm2->name);
+
+ prm_set_mod_reg_bits((1 << pwrdm2->dep_bit),
+ pwrdm1->prcm_offs, PM_WKDEP);
+
+ return 0;
+}
+
+/**
+ * pwrdm_del_wkdep - remove a wakeup dependency from pwrdm2 to pwrdm1
+ * @pwrdm1: wake this struct powerdomain * up (dependent)
+ * @pwrdm2: when this struct powerdomain * wakes up (source)
+ *
+ * Remove a wakeup dependency that causes pwrdm1 to wake up when pwrdm2
+ * wakes up. Returns -EINVAL if presented with invalid powerdomain
+ * pointers, -ENOENT if pwrdm2 cannot wake up pwrdm1 in hardware, or
+ * 0 upon success.
+ */
+int pwrdm_del_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
+{
+ struct powerdomain *p;
+
+ if (!pwrdm1)
+ return -EINVAL;
+
+ p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
+ if (IS_ERR(p)) {
+ pr_debug("powerdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
+ return IS_ERR(p);
+ }
+
+ pr_debug("powerdomain: hardware will no longer wake up %s after %s "
+ "wakes up\n", pwrdm1->name, pwrdm2->name);
+
+ prm_clear_mod_reg_bits((1 << pwrdm2->dep_bit),
+ pwrdm1->prcm_offs, PM_WKDEP);
+
+ return 0;
+}
+
+/**
+ * pwrdm_read_wkdep - read wakeup dependency state from pwrdm2 to pwrdm1
+ * @pwrdm1: wake this struct powerdomain * up (dependent)
+ * @pwrdm2: when this struct powerdomain * wakes up (source)
+ *
+ * Return 1 if a hardware wakeup dependency exists wherein pwrdm1 will be
+ * awoken when pwrdm2 wakes up; 0 if dependency is not set; -EINVAL
+ * if either powerdomain pointer is invalid; or -ENOENT if the hardware
+ * is incapable.
+ *
+ * REVISIT: Currently this function only represents software-controllable
+ * wakeup dependencies. Wakeup dependencies fixed in hardware are not
+ * yet handled here.
+ */
+int pwrdm_read_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
+{
+ struct powerdomain *p;
+
+ if (!pwrdm1)
+ return -EINVAL;
+
+ p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->wkdep_srcs);
+ if (IS_ERR(p)) {
+ pr_debug("powerdomain: hardware cannot set/clear wake up of "
+ "%s when %s wakes up\n", pwrdm1->name, pwrdm2->name);
+ return IS_ERR(p);
+ }
+
+ return prm_read_mod_bits_shift(pwrdm1->prcm_offs, PM_WKDEP,
+ (1 << pwrdm2->dep_bit));
+}
+
+/**
+ * pwrdm_add_sleepdep - add a sleep dependency from pwrdm2 to pwrdm1
+ * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
+ * @pwrdm2: when this struct powerdomain * is active (source)
+ *
+ * Prevent pwrdm1 from automatically going inactive (and then to
+ * retention or off) if pwrdm2 is still active. Returns -EINVAL if
+ * presented with invalid powerdomain pointers or called on a machine
+ * that does not support software-configurable hardware sleep dependencies,
+ * -ENOENT if the specified dependency cannot be set in hardware, or
+ * 0 upon success.
+ */
+int pwrdm_add_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
+{
+ struct powerdomain *p;
+
+ if (!pwrdm1)
+ return -EINVAL;
+
+ if (!cpu_is_omap34xx())
+ return -EINVAL;
+
+ p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
+ if (IS_ERR(p)) {
+ pr_debug("powerdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", pwrdm1->name,
+ pwrdm2->name);
+ return IS_ERR(p);
+ }
+
+ pr_debug("powerdomain: will prevent %s from sleeping if %s is active\n",
+ pwrdm1->name, pwrdm2->name);
+
+ cm_set_mod_reg_bits((1 << pwrdm2->dep_bit),
+ pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP);
+
+ return 0;
+}
+
+/**
+ * pwrdm_del_sleepdep - remove a sleep dependency from pwrdm2 to pwrdm1
+ * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
+ * @pwrdm2: when this struct powerdomain * is active (source)
+ *
+ * Allow pwrdm1 to automatically go inactive (and then to retention or
+ * off), independent of the activity state of pwrdm2. Returns -EINVAL
+ * if presented with invalid powerdomain pointers or called on a machine
+ * that does not support software-configurable hardware sleep dependencies,
+ * -ENOENT if the specified dependency cannot be cleared in hardware, or
+ * 0 upon success.
+ */
+int pwrdm_del_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
+{
+ struct powerdomain *p;
+
+ if (!pwrdm1)
+ return -EINVAL;
+
+ if (!cpu_is_omap34xx())
+ return -EINVAL;
+
+ p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
+ if (IS_ERR(p)) {
+ pr_debug("powerdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", pwrdm1->name,
+ pwrdm2->name);
+ return IS_ERR(p);
+ }
+
+ pr_debug("powerdomain: will no longer prevent %s from sleeping if "
+ "%s is active\n", pwrdm1->name, pwrdm2->name);
+
+ cm_clear_mod_reg_bits((1 << pwrdm2->dep_bit),
+ pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP);
+
+ return 0;
+}
+
+/**
+ * pwrdm_read_sleepdep - read sleep dependency state from pwrdm2 to pwrdm1
+ * @pwrdm1: prevent this struct powerdomain * from sleeping (dependent)
+ * @pwrdm2: when this struct powerdomain * is active (source)
+ *
+ * Return 1 if a hardware sleep dependency exists wherein pwrdm1 will
+ * not be allowed to automatically go inactive if pwrdm2 is active;
+ * 0 if pwrdm1's automatic power state inactivity transition is independent
+ * of pwrdm2's; -EINVAL if either powerdomain pointer is invalid or called
+ * on a machine that does not support software-configurable hardware sleep
+ * dependencies; or -ENOENT if the hardware is incapable.
+ *
+ * REVISIT: Currently this function only represents software-controllable
+ * sleep dependencies. Sleep dependencies fixed in hardware are not
+ * yet handled here.
+ */
+int pwrdm_read_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2)
+{
+ struct powerdomain *p;
+
+ if (!pwrdm1)
+ return -EINVAL;
+
+ if (!cpu_is_omap34xx())
+ return -EINVAL;
+
+ p = _pwrdm_deps_lookup(pwrdm2, pwrdm1->sleepdep_srcs);
+ if (IS_ERR(p)) {
+ pr_debug("powerdomain: hardware cannot set/clear sleep "
+ "dependency affecting %s from %s\n", pwrdm1->name,
+ pwrdm2->name);
+ return IS_ERR(p);
+ }
+
+ return prm_read_mod_bits_shift(pwrdm1->prcm_offs, OMAP3430_CM_SLEEPDEP,
+ (1 << pwrdm2->dep_bit));
+}
+
+/**
+ * pwrdm_get_mem_bank_count - get number of memory banks in this powerdomain
+ * @pwrdm: struct powerdomain *
+ *
+ * Return the number of controllable memory banks in powerdomain pwrdm,
+ * starting with 1. Returns -EINVAL if the powerdomain pointer is null.
+ */
+int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ return pwrdm->banks;
+}
+
+/**
+ * pwrdm_set_next_pwrst - set next powerdomain power state
+ * @pwrdm: struct powerdomain * to set
+ * @pwrst: one of the PWRDM_POWER_* macros
+ *
+ * Set the powerdomain pwrdm's next power state to pwrst. The powerdomain
+ * may not enter this state immediately if the preconditions for this state
+ * have not been satisfied. Returns -EINVAL if the powerdomain pointer is
+ * null or if the power state is invalid for the powerdomin, or returns 0
+ * upon success.
+ */
+int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (!(pwrdm->pwrsts & (1 << pwrst)))
+ return -EINVAL;
+
+ pr_debug("powerdomain: setting next powerstate for %s to %0x\n",
+ pwrdm->name, pwrst);
+
+ prm_rmw_mod_reg_bits(OMAP_POWERSTATE_MASK,
+ (pwrst << OMAP_POWERSTATE_SHIFT),
+ pwrdm->prcm_offs, PM_PWSTCTRL);
+
+ return 0;
+}
+
+/**
+ * pwrdm_read_next_pwrst - get next powerdomain power state
+ * @pwrdm: struct powerdomain * to get power state
+ *
+ * Return the powerdomain pwrdm's next power state. Returns -EINVAL
+ * if the powerdomain pointer is null or returns the next power state
+ * upon success.
+ */
+int pwrdm_read_next_pwrst(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTCTRL,
+ OMAP_POWERSTATE_MASK);
+}
+
+/**
+ * pwrdm_read_pwrst - get current powerdomain power state
+ * @pwrdm: struct powerdomain * to get power state
+ *
+ * Return the powerdomain pwrdm's current power state. Returns -EINVAL
+ * if the powerdomain pointer is null or returns the current power state
+ * upon success.
+ */
+int pwrdm_read_pwrst(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST,
+ OMAP_POWERSTATEST_MASK);
+}
+
+/**
+ * pwrdm_read_prev_pwrst - get previous powerdomain power state
+ * @pwrdm: struct powerdomain * to get previous power state
+ *
+ * Return the powerdomain pwrdm's previous power state. Returns -EINVAL
+ * if the powerdomain pointer is null or returns the previous power state
+ * upon success.
+ */
+int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST,
+ OMAP3430_LASTPOWERSTATEENTERED_MASK);
+}
+
+/**
+ * pwrdm_set_logic_retst - set powerdomain logic power state upon retention
+ * @pwrdm: struct powerdomain * to set
+ * @pwrst: one of the PWRDM_POWER_* macros
+ *
+ * Set the next power state that the logic portion of the powerdomain
+ * pwrdm will enter when the powerdomain enters retention. This will
+ * be either RETENTION or OFF, if supported. Returns -EINVAL if the
+ * powerdomain pointer is null or the target power state is not not
+ * supported, or returns 0 upon success.
+ */
+int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (!(pwrdm->pwrsts_logic_ret & (1 << pwrst)))
+ return -EINVAL;
+
+ pr_debug("powerdomain: setting next logic powerstate for %s to %0x\n",
+ pwrdm->name, pwrst);
+
+ /*
+ * The register bit names below may not correspond to the
+ * actual names of the bits in each powerdomain's register,
+ * but the type of value returned is the same for each
+ * powerdomain.
+ */
+ prm_rmw_mod_reg_bits(OMAP3430_LOGICL1CACHERETSTATE,
+ (pwrst << __ffs(OMAP3430_LOGICL1CACHERETSTATE)),
+ pwrdm->prcm_offs, PM_PWSTCTRL);
+
+ return 0;
+}
+
+/**
+ * pwrdm_set_mem_onst - set memory power state while powerdomain ON
+ * @pwrdm: struct powerdomain * to set
+ * @bank: memory bank number to set (0-3)
+ * @pwrst: one of the PWRDM_POWER_* macros
+ *
+ * Set the next power state that memory bank x of the powerdomain
+ * pwrdm will enter when the powerdomain enters the ON state. Bank
+ * will be a number from 0 to 3, and represents different types of
+ * memory, depending on the powerdomain. Returns -EINVAL if the
+ * powerdomain pointer is null or the target power state is not not
+ * supported for this memory bank, -EEXIST if the target memory bank
+ * does not exist or is not controllable, or returns 0 upon success.
+ */
+int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
+{
+ u32 m;
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (pwrdm->banks < (bank + 1))
+ return -EEXIST;
+
+ if (!(pwrdm->pwrsts_mem_on[bank] & (1 << pwrst)))
+ return -EINVAL;
+
+ pr_debug("powerdomain: setting next memory powerstate for domain %s "
+ "bank %0x while pwrdm-ON to %0x\n", pwrdm->name, bank, pwrst);
+
+ /*
+ * The register bit names below may not correspond to the
+ * actual names of the bits in each powerdomain's register,
+ * but the type of value returned is the same for each
+ * powerdomain.
+ */
+ switch (bank) {
+ case 0:
+ m = OMAP3430_SHAREDL1CACHEFLATONSTATE_MASK;
+ break;
+ case 1:
+ m = OMAP3430_L1FLATMEMONSTATE_MASK;
+ break;
+ case 2:
+ m = OMAP3430_SHAREDL2CACHEFLATONSTATE_MASK;
+ break;
+ case 3:
+ m = OMAP3430_L2FLATMEMONSTATE_MASK;
+ break;
+ default:
+ WARN_ON(1); /* should never happen */
+ return -EEXIST;
+ }
+
+ prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)),
+ pwrdm->prcm_offs, PM_PWSTCTRL);
+
+ return 0;
+}
+
+/**
+ * pwrdm_set_mem_retst - set memory power state while powerdomain in RET
+ * @pwrdm: struct powerdomain * to set
+ * @bank: memory bank number to set (0-3)
+ * @pwrst: one of the PWRDM_POWER_* macros
+ *
+ * Set the next power state that memory bank x of the powerdomain
+ * pwrdm will enter when the powerdomain enters the RETENTION state.
+ * Bank will be a number from 0 to 3, and represents different types
+ * of memory, depending on the powerdomain. pwrst will be either
+ * RETENTION or OFF, if supported. Returns -EINVAL if the powerdomain
+ * pointer is null or the target power state is not not supported for
+ * this memory bank, -EEXIST if the target memory bank does not exist
+ * or is not controllable, or returns 0 upon success.
+ */
+int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst)
+{
+ u32 m;
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (pwrdm->banks < (bank + 1))
+ return -EEXIST;
+
+ if (!(pwrdm->pwrsts_mem_ret[bank] & (1 << pwrst)))
+ return -EINVAL;
+
+ pr_debug("powerdomain: setting next memory powerstate for domain %s "
+ "bank %0x while pwrdm-RET to %0x\n", pwrdm->name, bank, pwrst);
+
+ /*
+ * The register bit names below may not correspond to the
+ * actual names of the bits in each powerdomain's register,
+ * but the type of value returned is the same for each
+ * powerdomain.
+ */
+ switch (bank) {
+ case 0:
+ m = OMAP3430_SHAREDL1CACHEFLATRETSTATE;
+ break;
+ case 1:
+ m = OMAP3430_L1FLATMEMRETSTATE;
+ break;
+ case 2:
+ m = OMAP3430_SHAREDL2CACHEFLATRETSTATE;
+ break;
+ case 3:
+ m = OMAP3430_L2FLATMEMRETSTATE;
+ break;
+ default:
+ WARN_ON(1); /* should never happen */
+ return -EEXIST;
+ }
+
+ prm_rmw_mod_reg_bits(m, (pwrst << __ffs(m)), pwrdm->prcm_offs,
+ PM_PWSTCTRL);
+
+ return 0;
+}
+
+/**
+ * pwrdm_read_logic_pwrst - get current powerdomain logic retention power state
+ * @pwrdm: struct powerdomain * to get current logic retention power state
+ *
+ * Return the current power state that the logic portion of
+ * powerdomain pwrdm will enter
+ * Returns -EINVAL if the powerdomain pointer is null or returns the
+ * current logic retention power state upon success.
+ */
+int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST,
+ OMAP3430_LOGICSTATEST);
+}
+
+/**
+ * pwrdm_read_prev_logic_pwrst - get previous powerdomain logic power state
+ * @pwrdm: struct powerdomain * to get previous logic power state
+ *
+ * Return the powerdomain pwrdm's logic power state. Returns -EINVAL
+ * if the powerdomain pointer is null or returns the previous logic
+ * power state upon success.
+ */
+int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ /*
+ * The register bit names below may not correspond to the
+ * actual names of the bits in each powerdomain's register,
+ * but the type of value returned is the same for each
+ * powerdomain.
+ */
+ return prm_read_mod_bits_shift(pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST,
+ OMAP3430_LASTLOGICSTATEENTERED);
+}
+
+/**
+ * pwrdm_read_mem_pwrst - get current memory bank power state
+ * @pwrdm: struct powerdomain * to get current memory bank power state
+ * @bank: memory bank number (0-3)
+ *
+ * Return the powerdomain pwrdm's current memory power state for bank
+ * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
+ * the target memory bank does not exist or is not controllable, or
+ * returns the current memory power state upon success.
+ */
+int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+ u32 m;
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (pwrdm->banks < (bank + 1))
+ return -EEXIST;
+
+ /*
+ * The register bit names below may not correspond to the
+ * actual names of the bits in each powerdomain's register,
+ * but the type of value returned is the same for each
+ * powerdomain.
+ */
+ switch (bank) {
+ case 0:
+ m = OMAP3430_SHAREDL1CACHEFLATSTATEST_MASK;
+ break;
+ case 1:
+ m = OMAP3430_L1FLATMEMSTATEST_MASK;
+ break;
+ case 2:
+ m = OMAP3430_SHAREDL2CACHEFLATSTATEST_MASK;
+ break;
+ case 3:
+ m = OMAP3430_L2FLATMEMSTATEST_MASK;
+ break;
+ default:
+ WARN_ON(1); /* should never happen */
+ return -EEXIST;
+ }
+
+ return prm_read_mod_bits_shift(pwrdm->prcm_offs, PM_PWSTST, m);
+}
+
+/**
+ * pwrdm_read_prev_mem_pwrst - get previous memory bank power state
+ * @pwrdm: struct powerdomain * to get previous memory bank power state
+ * @bank: memory bank number (0-3)
+ *
+ * Return the powerdomain pwrdm's previous memory power state for bank
+ * x. Returns -EINVAL if the powerdomain pointer is null, -EEXIST if
+ * the target memory bank does not exist or is not controllable, or
+ * returns the previous memory power state upon success.
+ */
+int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank)
+{
+ u32 m;
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (pwrdm->banks < (bank + 1))
+ return -EEXIST;
+
+ /*
+ * The register bit names below may not correspond to the
+ * actual names of the bits in each powerdomain's register,
+ * but the type of value returned is the same for each
+ * powerdomain.
+ */
+ switch (bank) {
+ case 0:
+ m = OMAP3430_LASTMEM1STATEENTERED_MASK;
+ break;
+ case 1:
+ m = OMAP3430_LASTMEM2STATEENTERED_MASK;
+ break;
+ case 2:
+ m = OMAP3430_LASTSHAREDL2CACHEFLATSTATEENTERED_MASK;
+ break;
+ case 3:
+ m = OMAP3430_LASTL2FLATMEMSTATEENTERED_MASK;
+ break;
+ default:
+ WARN_ON(1); /* should never happen */
+ return -EEXIST;
+ }
+
+ return prm_read_mod_bits_shift(pwrdm->prcm_offs,
+ OMAP3430_PM_PREPWSTST, m);
+}
+
+/**
+ * pwrdm_clear_all_prev_pwrst - clear previous powerstate register for a pwrdm
+ * @pwrdm: struct powerdomain * to clear
+ *
+ * Clear the powerdomain's previous power state register. Clears the
+ * entire register, including logic and memory bank previous power states.
+ * Returns -EINVAL if the powerdomain pointer is null, or returns 0 upon
+ * success.
+ */
+int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ /*
+ * XXX should get the powerdomain's current state here;
+ * warn & fail if it is not ON.
+ */
+
+ pr_debug("powerdomain: clearing previous power state reg for %s\n",
+ pwrdm->name);
+
+ prm_write_mod_reg(0, pwrdm->prcm_offs, OMAP3430_PM_PREPWSTST);
+
+ return 0;
+}
+
+/**
+ * pwrdm_wait_transition - wait for powerdomain power transition to finish
+ * @pwrdm: struct powerdomain * to wait for
+ *
+ * If the powerdomain pwrdm is in the process of a state transition,
+ * spin until it completes the power transition, or until an iteration
+ * bailout value is reached. Returns -EINVAL if the powerdomain
+ * pointer is null, -EAGAIN if the bailout value was reached, or
+ * returns 0 upon success.
+ */
+int pwrdm_wait_transition(struct powerdomain *pwrdm)
+{
+ u32 c = 0;
+
+ if (!pwrdm)
+ return -EINVAL;
+
+ /*
+ * REVISIT: pwrdm_wait_transition() may be better implemented
+ * via a callback and a periodic timer check -- how long do we expect
+ * powerdomain transitions to take?
+ */
+
+ /* XXX Is this udelay() value meaningful? */
+ while ((prm_read_mod_reg(pwrdm->prcm_offs, PM_PWSTST) &
+ OMAP_INTRANSITION) &&
+ (c++ < PWRDM_TRANSITION_BAILOUT))
+ udelay(1);
+
+ if (c >= PWRDM_TRANSITION_BAILOUT) {
+ printk(KERN_ERR "powerdomain: waited too long for "
+ "powerdomain %s to complete transition\n", pwrdm->name);
+ return -EAGAIN;
+ }
+
+ pr_debug("powerdomain: completed transition in %d loops\n", c);
+
+ return 0;
+}
+
+
diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig
index b917206..e815fa3 100644
--- a/arch/arm/plat-omap/Kconfig
+++ b/arch/arm/plat-omap/Kconfig
@@ -29,6 +29,18 @@ config OMAP_DEBUG_LEDS
depends on OMAP_DEBUG_DEVICES
default y if LEDS || LEDS_OMAP_DEBUG
+config OMAP_DEBUG_POWERDOMAIN
+ bool "Emit debug messages from powerdomain layer"
+ depends on ARCH_OMAP2 || ARCH_OMAP3
+ default n
+ help
+ Say Y here if you want to compile in powerdomain layer
+ debugging messages for OMAP2/3. These messages can
+ provide more detail as to why some powerdomain calls
+ may be failing, and will also emit a descriptive message
+ for every powerdomain register write. However, the
+ extra detail costs some memory.
+
config OMAP_RESET_CLOCKS
bool "Reset unused clocks during boot"
depends on ARCH_OMAP
diff --git a/include/asm-arm/arch-omap/powerdomain.h b/include/asm-arm/arch-omap/powerdomain.h
new file mode 100644
index 0000000..4531b49
--- /dev/null
+++ b/include/asm-arm/arch-omap/powerdomain.h
@@ -0,0 +1,139 @@
+/*
+ * OMAP2/3 powerdomain control
+ *
+ * Copyright (C) 2007-8 Texas Instruments, Inc.
+ * Copyright (C) 2007-8 Nokia Corporation
+ *
+ * Written by Paul Walmsley
+ *
+ * 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.
+ */
+
+#ifndef ASM_ARM_ARCH_OMAP_POWERDOMAIN
+#define ASM_ARM_ARCH_OMAP_POWERDOMAIN
+
+#include <linux/types.h>
+#include <linux/list.h>
+
+#include <asm/atomic.h>
+
+#include <asm/arch/cpu.h>
+
+
+/* Powerdomain basic power states */
+#define PWRDM_POWER_OFF 0x0
+#define PWRDM_POWER_RET 0x1
+#define PWRDM_POWER_INACTIVE 0x2
+#define PWRDM_POWER_ON 0x3
+
+/* Powerdomain allowable state bitfields */
+#define PWRSTS_OFF_ON ((1 << PWRDM_POWER_OFF) | \
+ (1 << PWRDM_POWER_ON))
+
+#define PWRSTS_OFF_RET ((1 << PWRDM_POWER_OFF) | \
+ (1 << PWRDM_POWER_RET))
+
+#define PWRSTS_OFF_RET_ON (PWRSTS_OFF_RET | (1 << PWRDM_POWER_ON))
+
+
+/*
+ * Number of memory banks that are power-controllable. On OMAP3430, the
+ * maximum is 4.
+ */
+#define PWRDM_MAX_MEM_BANKS 4
+
+/* XXX A completely arbitrary number. What is reasonable here? */
+#define PWRDM_TRANSITION_BAILOUT 100000
+
+struct powerdomain;
+
+/* Encodes dependencies between powerdomains - statically defined */
+struct pwrdm_dep {
+
+ /* Powerdomain name */
+ const char *pwrdm_name;
+
+ /* Powerdomain pointer - resolved by the powerdomain code */
+ struct powerdomain *pwrdm;
+
+ /* Flags to mark OMAP chip restrictions, etc. */
+ const struct omap_chip_id omap_chip;
+
+};
+
+struct powerdomain {
+
+ /* Powerdomain name */
+ const char *name;
+
+ /* the address offset from CM_BASE/PRM_BASE */
+ const s16 prcm_offs;
+
+ /* Used to represent the OMAP chip types containing this pwrdm */
+ const struct omap_chip_id omap_chip;
+
+ /* Bit shift of this powerdomain's PM_WKDEP/CM_SLEEPDEP bit */
+ const u8 dep_bit;
+
+ /* Powerdomains that can be told to wake this powerdomain up */
+ struct pwrdm_dep *wkdep_srcs;
+
+ /* Powerdomains that can be told to keep this pwrdm from inactivity */
+ struct pwrdm_dep *sleepdep_srcs;
+
+ /* Possible powerdomain power states */
+ const u8 pwrsts;
+
+ /* Possible logic power states when pwrdm in RETENTION */
+ const u8 pwrsts_logic_ret;
+
+ /* Number of software-controllable memory banks in this powerdomain */
+ const u8 banks;
+
+ /* Possible memory bank pwrstates when pwrdm in RETENTION */
+ const u8 pwrsts_mem_ret[PWRDM_MAX_MEM_BANKS];
+
+ /* Possible memory bank pwrstates when pwrdm is ON */
+ const u8 pwrsts_mem_on[PWRDM_MAX_MEM_BANKS];
+
+ struct list_head node;
+
+};
+
+
+void pwrdm_init(struct powerdomain **pwrdm_list);
+
+int pwrdm_register(struct powerdomain *pwrdm);
+int pwrdm_unregister(struct powerdomain *pwrdm);
+struct powerdomain *pwrdm_lookup(const char *name);
+
+int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm));
+
+int pwrdm_add_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2);
+int pwrdm_del_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2);
+int pwrdm_read_wkdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2);
+int pwrdm_add_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2);
+int pwrdm_del_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2);
+int pwrdm_read_sleepdep(struct powerdomain *pwrdm1, struct powerdomain *pwrdm2);
+
+int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm);
+
+int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst);
+int pwrdm_read_next_pwrst(struct powerdomain *pwrdm);
+int pwrdm_read_prev_pwrst(struct powerdomain *pwrdm);
+int pwrdm_clear_all_prev_pwrst(struct powerdomain *pwrdm);
+
+int pwrdm_set_logic_retst(struct powerdomain *pwrdm, u8 pwrst);
+int pwrdm_set_mem_onst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
+int pwrdm_set_mem_retst(struct powerdomain *pwrdm, u8 bank, u8 pwrst);
+
+int pwrdm_read_logic_pwrst(struct powerdomain *pwrdm);
+int pwrdm_read_prev_logic_pwrst(struct powerdomain *pwrdm);
+int pwrdm_read_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
+int pwrdm_read_prev_mem_pwrst(struct powerdomain *pwrdm, u8 bank);
+
+int pwrdm_wait_transition(struct powerdomain *pwrdm);
+
+#endif
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