ARM: OMAP2: Clockdomain: Add base OMAP2/3 clockdomain code

This patch creates an interface to the clockdomain 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.

The patch also adds clockdomain usecount tracking.  This is intended
to be called whenever the first clock in a clockdomain is enabled, or
when the last enabled clock in a clockdomain is disabled.  If the
clockdomain is in software-supervised mode, the code will force-wakeup
or force-sleep the clockdomain.  If the clockdomain is in
hardware-supervised mode, the first clock enable will add sleep and
wakeup dependencies on a user-selectable set of parent domains (usually
MPU & IVA2), and the disable will remove them.

Each clockdomain will be defined in later patches as static
structures.  The clockdomain structures are linked into a list at boot
by clkdm_register(), similar to the OMAP clock code.

The patch adds a Kconfig option, CONFIG_OMAP_DEBUG_CLOCKDOMAIN, which
when enabled will emit verbose debug messages via pr_debug().

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 603 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c
new file mode 100644
index 000000000000..f867d8f1d0e9
--- /dev/null
+++ b/arch/arm/mach-omap2/clockdomain.c
@@ -0,0 +1,603 @@
+/*
+ * OMAP2/3 clockdomain framework functions
+ *
+ * Copyright (C) 2008 Texas Instruments, Inc.
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * Written by Paul Walmsley and Jouni Högander
+ *
+ * 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_CLOCKDOMAIN
+#  define DEBUG
+#endif
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/limits.h>
+
+#include <linux/io.h>
+
+#include <linux/bitops.h>
+
+#include <mach/clock.h>
+
+#include "prm.h"
+#include "prm-regbits-24xx.h"
+#include "cm.h"
+
+#include <mach/powerdomain.h>
+#include <mach/clockdomain.h>
+
+/* clkdm_list contains all registered struct clockdomains */
+static LIST_HEAD(clkdm_list);
+
+/* clkdm_mutex protects clkdm_list add and del ops */
+static DEFINE_MUTEX(clkdm_mutex);
+
+/* array of powerdomain deps to be added/removed when clkdm in hwsup mode */
+static struct clkdm_pwrdm_autodep *autodeps;
+
+
+/* Private functions */
+
+/*
+ * _autodep_lookup - resolve autodep pwrdm names to pwrdm pointers; store
+ * @autodep: struct clkdm_pwrdm_autodep * to resolve
+ *
+ * Resolve autodep powerdomain names to powerdomain pointers via
+ * pwrdm_lookup() and store the pointers in the autodep structure.  An
+ * "autodep" is a powerdomain sleep/wakeup dependency that is
+ * automatically added and removed whenever clocks in the associated
+ * clockdomain are enabled or disabled (respectively) when the
+ * clockdomain is in hardware-supervised mode.  Meant to be called
+ * once at clockdomain layer initialization, since these should remain
+ * fixed for a particular architecture.  No return value.
+ */
+static void _autodep_lookup(struct clkdm_pwrdm_autodep *autodep)
+{
+        struct powerdomain *pwrdm;
+
+        if (!autodep)
+                return;
+
+        if (!omap_chip_is(autodep->omap_chip))
+                return;
+
+        pwrdm = pwrdm_lookup(autodep->pwrdm_name);
+        if (!pwrdm) {
+                pr_debug("clockdomain: _autodep_lookup: powerdomain %s "
+                         "does not exist\n", autodep->pwrdm_name);
+                WARN_ON(1);
+                return;
+        }
+        autodep->pwrdm = pwrdm;
+
+        return;
+}
+
+/*
+ * _clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable
+ * @clkdm: struct clockdomain *
+ *
+ * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm'
+ * in hardware-supervised mode.  Meant to be called from clock framework
+ * when a clock inside clockdomain 'clkdm' is enabled.  No return value.
+ */
+static void _clkdm_add_autodeps(struct clockdomain *clkdm)
+{
+        struct clkdm_pwrdm_autodep *autodep;
+
+        for (autodep = autodeps; autodep->pwrdm_name; autodep++) {
+                if (!autodep->pwrdm)
+                        continue;
+
+                pr_debug("clockdomain: adding %s sleepdep/wkdep for "
+                         "pwrdm %s\n", autodep->pwrdm_name,
+                         clkdm->pwrdm->name);
+
+                pwrdm_add_sleepdep(clkdm->pwrdm, autodep->pwrdm);
+                pwrdm_add_wkdep(clkdm->pwrdm, autodep->pwrdm);
+        }
+}
+
+/*
+ * _clkdm_add_autodeps - remove auto sleepdeps/wkdeps from clkdm
+ * @clkdm: struct clockdomain *
+ *
+ * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm'
+ * in hardware-supervised mode.  Meant to be called from clock framework
+ * when a clock inside clockdomain 'clkdm' is disabled.  No return value.
+ */
+static void _clkdm_del_autodeps(struct clockdomain *clkdm)
+{
+        struct clkdm_pwrdm_autodep *autodep;
+
+        for (autodep = autodeps; autodep->pwrdm_name; autodep++) {
+                if (!autodep->pwrdm)
+                        continue;
+
+                pr_debug("clockdomain: removing %s sleepdep/wkdep for "
+                         "pwrdm %s\n", autodep->pwrdm_name,
+                         clkdm->pwrdm->name);
+
+                pwrdm_del_sleepdep(clkdm->pwrdm, autodep->pwrdm);
+                pwrdm_del_wkdep(clkdm->pwrdm, autodep->pwrdm);
+        }
+}
+
+
+static struct clockdomain *_clkdm_lookup(const char *name)
+{
+        struct clockdomain *clkdm, *temp_clkdm;
+
+        if (!name)
+                return NULL;
+
+        clkdm = NULL;
+
+        list_for_each_entry(temp_clkdm, &clkdm_list, node) {
+                if (!strcmp(name, temp_clkdm->name)) {
+                        clkdm = temp_clkdm;
+                        break;
+                }
+        }
+
+        return clkdm;
+}
+
+
+/* Public functions */
+
+/**
+ * clkdm_init - set up the clockdomain layer
+ * @clkdms: optional pointer to an array of clockdomains to register
+ * @init_autodeps: optional pointer to an array of autodeps to register
+ *
+ * Set up internal state.  If a pointer to an array of clockdomains
+ * was supplied, loop through the list of clockdomains, register all
+ * that are available on the current platform.  Similarly, if a
+ * pointer to an array of clockdomain-powerdomain autodependencies was
+ * provided, register those.  No return value.
+ */
+void clkdm_init(struct clockdomain **clkdms,
+                struct clkdm_pwrdm_autodep *init_autodeps)
+{
+        struct clockdomain **c = NULL;
+        struct clkdm_pwrdm_autodep *autodep = NULL;
+
+        if (clkdms)
+                for (c = clkdms; *c; c++)
+                        clkdm_register(*c);
+
+        autodeps = init_autodeps;
+        if (autodeps)
+                for (autodep = autodeps; autodep->pwrdm_name; autodep++)
+                        _autodep_lookup(autodep);
+}
+
+/**
+ * clkdm_register - register a clockdomain
+ * @clkdm: struct clockdomain * to register
+ *
+ * Adds a clockdomain to the internal clockdomain list.
+ * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
+ * already registered by the provided name, or 0 upon success.
+ */
+int clkdm_register(struct clockdomain *clkdm)
+{
+        int ret = -EINVAL;
+        struct powerdomain *pwrdm;
+
+        if (!clkdm || !clkdm->name)
+                return -EINVAL;
+
+        if (!omap_chip_is(clkdm->omap_chip))
+                return -EINVAL;
+
+        pwrdm = pwrdm_lookup(clkdm->pwrdm_name);
+        if (!pwrdm) {
+                pr_debug("clockdomain: clkdm_register %s: powerdomain %s "
+                         "does not exist\n", clkdm->name, clkdm->pwrdm_name);
+                return -EINVAL;
+        }
+        clkdm->pwrdm = pwrdm;
+
+        mutex_lock(&clkdm_mutex);
+        /* Verify that the clockdomain is not already registered */
+        if (_clkdm_lookup(clkdm->name)) {
+                ret = -EEXIST;
+                goto cr_unlock;
+        };
+
+        list_add(&clkdm->node, &clkdm_list);
+
+        pr_debug("clockdomain: registered %s\n", clkdm->name);
+        ret = 0;
+
+cr_unlock:
+        mutex_unlock(&clkdm_mutex);
+
+        return ret;
+}
+
+/**
+ * clkdm_unregister - unregister a clockdomain
+ * @clkdm: struct clockdomain * to unregister
+ *
+ * Removes a clockdomain from the internal clockdomain list.  Returns
+ * -EINVAL if clkdm argument is NULL.
+ */
+int clkdm_unregister(struct clockdomain *clkdm)
+{
+        if (!clkdm)
+                return -EINVAL;
+
+        mutex_lock(&clkdm_mutex);
+        list_del(&clkdm->node);
+        mutex_unlock(&clkdm_mutex);
+
+        pr_debug("clockdomain: unregistered %s\n", clkdm->name);
+
+        return 0;
+}
+
+/**
+ * clkdm_lookup - look up a clockdomain by name, return a pointer
+ * @name: name of clockdomain
+ *
+ * Find a registered clockdomain by its name.  Returns a pointer to the
+ * struct clockdomain if found, or NULL otherwise.
+ */
+struct clockdomain *clkdm_lookup(const char *name)
+{
+        struct clockdomain *clkdm, *temp_clkdm;
+
+        if (!name)
+                return NULL;
+
+        clkdm = NULL;
+
+        mutex_lock(&clkdm_mutex);
+        list_for_each_entry(temp_clkdm, &clkdm_list, node) {
+                if (!strcmp(name, temp_clkdm->name)) {
+                        clkdm = temp_clkdm;
+                        break;
+                }
+        }
+        mutex_unlock(&clkdm_mutex);
+
+        return clkdm;
+}
+
+/**
+ * clkdm_for_each - call function on each registered clockdomain
+ * @fn: callback function *
+ *
+ * Call the supplied function for each registered clockdomain.
+ * The callback function can return anything but 0 to bail
+ * out early from the iterator.  The callback function is called with
+ * the clkdm_mutex held, so no clockdomain structure manipulation
+ * functions should be called from the callback, although hardware
+ * clockdomain 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 clkdm_for_each(int (*fn)(struct clockdomain *clkdm))
+{
+        struct clockdomain *clkdm;
+        int ret = 0;
+
+        if (!fn)
+                return -EINVAL;
+
+        mutex_lock(&clkdm_mutex);
+        list_for_each_entry(clkdm, &clkdm_list, node) {
+                ret = (*fn)(clkdm);
+                if (ret)
+                        break;
+        }
+        mutex_unlock(&clkdm_mutex);
+
+        return ret;
+}
+
+
+/* Hardware clockdomain control */
+
+/**
+ * omap2_clkdm_clktrctrl_read - read the clkdm's current state transition mode
+ * @clk: struct clk * of a clockdomain
+ *
+ * Return the clockdomain's current state transition mode from the
+ * corresponding domain CM_CLKSTCTRL register.  Returns -EINVAL if clk
+ * is NULL or the current mode upon success.
+ */
+static int omap2_clkdm_clktrctrl_read(struct clockdomain *clkdm)
+{
+        u32 v;
+
+        if (!clkdm)
+                return -EINVAL;
+
+        v = cm_read_mod_reg(clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+        v &= clkdm->clktrctrl_mask;
+        v >>= __ffs(clkdm->clktrctrl_mask);
+
+        return v;
+}
+
+/**
+ * omap2_clkdm_sleep - force clockdomain sleep transition
+ * @clkdm: struct clockdomain *
+ *
+ * Instruct the CM to force a sleep transition on the specified
+ * clockdomain 'clkdm'.  Returns -EINVAL if clk is NULL or if
+ * clockdomain does not support software-initiated sleep; 0 upon
+ * success.
+ */
+int omap2_clkdm_sleep(struct clockdomain *clkdm)
+{
+        if (!clkdm)
+                return -EINVAL;
+
+        if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) {
+                pr_debug("clockdomain: %s does not support forcing "
+                         "sleep via software\n", clkdm->name);
+                return -EINVAL;
+        }
+
+        pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name);
+
+        if (cpu_is_omap24xx()) {
+
+                cm_set_mod_reg_bits(OMAP24XX_FORCESTATE,
+                                    clkdm->pwrdm->prcm_offs, PM_PWSTCTRL);
+
+        } else if (cpu_is_omap34xx()) {
+
+                u32 v = (OMAP34XX_CLKSTCTRL_FORCE_SLEEP <<
+                         __ffs(clkdm->clktrctrl_mask));
+
+                cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
+                                    clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+
+        } else {
+                BUG();
+        };
+
+        return 0;
+}
+
+/**
+ * omap2_clkdm_wakeup - force clockdomain wakeup transition
+ * @clkdm: struct clockdomain *
+ *
+ * Instruct the CM to force a wakeup transition on the specified
+ * clockdomain 'clkdm'.  Returns -EINVAL if clkdm is NULL or if the
+ * clockdomain does not support software-controlled wakeup; 0 upon
+ * success.
+ */
+int omap2_clkdm_wakeup(struct clockdomain *clkdm)
+{
+        if (!clkdm)
+                return -EINVAL;
+
+        if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) {
+                pr_debug("clockdomain: %s does not support forcing "
+                         "wakeup via software\n", clkdm->name);
+                return -EINVAL;
+        }
+
+        pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name);
+
+        if (cpu_is_omap24xx()) {
+
+                cm_clear_mod_reg_bits(OMAP24XX_FORCESTATE,
+                                      clkdm->pwrdm->prcm_offs, PM_PWSTCTRL);
+
+        } else if (cpu_is_omap34xx()) {
+
+                u32 v = (OMAP34XX_CLKSTCTRL_FORCE_WAKEUP <<
+                         __ffs(clkdm->clktrctrl_mask));
+
+                cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask, v,
+                                    clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+
+        } else {
+                BUG();
+        };
+
+        return 0;
+}
+
+/**
+ * omap2_clkdm_allow_idle - enable hwsup idle transitions for clkdm
+ * @clkdm: struct clockdomain *
+ *
+ * Allow the hardware to automatically switch the clockdomain into
+ * active or idle states, as needed by downstream clocks.  If the
+ * clockdomain has any downstream clocks enabled in the clock
+ * framework, wkdep/sleepdep autodependencies are added; this is so
+ * device drivers can read and write to the device.  No return value.
+ */
+void omap2_clkdm_allow_idle(struct clockdomain *clkdm)
+{
+        u32 v;
+
+        if (!clkdm)
+                return;
+
+        if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) {
+                pr_debug("clock: automatic idle transitions cannot be enabled "
+                         "on clockdomain %s\n", clkdm->name);
+                return;
+        }
+
+        pr_debug("clockdomain: enabling automatic idle transitions for %s\n",
+                 clkdm->name);
+
+        if (atomic_read(&clkdm->usecount) > 0)
+                _clkdm_add_autodeps(clkdm);
+
+        if (cpu_is_omap24xx())
+                v = OMAP24XX_CLKSTCTRL_ENABLE_AUTO;
+        else if (cpu_is_omap34xx())
+                v = OMAP34XX_CLKSTCTRL_ENABLE_AUTO;
+        else
+                BUG();
+
+
+        cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask,
+                            v << __ffs(clkdm->clktrctrl_mask),
+                            clkdm->pwrdm->prcm_offs,
+                            CM_CLKSTCTRL);
+}
+
+/**
+ * omap2_clkdm_deny_idle - disable hwsup idle transitions for clkdm
+ * @clkdm: struct clockdomain *
+ *
+ * Prevent the hardware from automatically switching the clockdomain
+ * into inactive or idle states.  If the clockdomain has downstream
+ * clocks enabled in the clock framework, wkdep/sleepdep
+ * autodependencies are removed.  No return value.
+ */
+void omap2_clkdm_deny_idle(struct clockdomain *clkdm)
+{
+        u32 v;
+
+        if (!clkdm)
+                return;
+
+        if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) {
+                pr_debug("clockdomain: automatic idle transitions cannot be "
+                         "disabled on %s\n", clkdm->name);
+                return;
+        }
+
+        pr_debug("clockdomain: disabling automatic idle transitions for %s\n",
+                 clkdm->name);
+
+        if (cpu_is_omap24xx())
+                v = OMAP24XX_CLKSTCTRL_DISABLE_AUTO;
+        else if (cpu_is_omap34xx())
+                v = OMAP34XX_CLKSTCTRL_DISABLE_AUTO;
+        else
+                BUG();
+
+        cm_rmw_mod_reg_bits(clkdm->clktrctrl_mask,
+                            v << __ffs(clkdm->clktrctrl_mask),
+                            clkdm->pwrdm->prcm_offs, CM_CLKSTCTRL);
+
+        if (atomic_read(&clkdm->usecount) > 0)
+                _clkdm_del_autodeps(clkdm);
+}
+
+
+/* Clockdomain-to-clock framework interface code */
+
+/**
+ * omap2_clkdm_clk_enable - add an enabled downstream clock to this clkdm
+ * @clkdm: struct clockdomain *
+ * @clk: struct clk * of the enabled downstream clock
+ *
+ * Increment the usecount of this clockdomain 'clkdm' and ensure that
+ * it is awake.  Intended to be called by clk_enable() code.  If the
+ * clockdomain is in software-supervised idle mode, force the
+ * clockdomain to wake.  If the clockdomain is in hardware-supervised
+ * idle mode, add clkdm-pwrdm autodependencies, to ensure that devices
+ * in the clockdomain can be read from/written to by on-chip processors.
+ * Returns -EINVAL if passed null pointers; returns 0 upon success or
+ * if the clockdomain is in hwsup idle mode.
+ */
+int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
+{
+        int v;
+
+        /*
+         * XXX Rewrite this code to maintain a list of enabled
+         * downstream clocks for debugging purposes?
+         */
+
+        if (!clkdm || !clk)
+                return -EINVAL;
+
+        if (atomic_inc_return(&clkdm->usecount) > 1)
+                return 0;
+
+        /* Clockdomain now has one enabled downstream clock */
+
+        pr_debug("clockdomain: clkdm %s: clk %s now enabled\n", clkdm->name,
+                 clk->name);
+
+        v = omap2_clkdm_clktrctrl_read(clkdm);
+
+        if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
+            (cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO))
+                _clkdm_add_autodeps(clkdm);
+        else
+                omap2_clkdm_wakeup(clkdm);
+
+        return 0;
+}
+
+/**
+ * omap2_clkdm_clk_disable - remove an enabled downstream clock from this clkdm
+ * @clkdm: struct clockdomain *
+ * @clk: struct clk * of the disabled downstream clock
+ *
+ * Decrement the usecount of this clockdomain 'clkdm'. Intended to be
+ * called by clk_disable() code.  If the usecount goes to 0, put the
+ * clockdomain to sleep (software-supervised mode) or remove the
+ * clkdm-pwrdm autodependencies (hardware-supervised mode).  Returns
+ * -EINVAL if passed null pointers; -ERANGE if the clkdm usecount
+ * underflows and debugging is enabled; or returns 0 upon success or
+ * if the clockdomain is in hwsup idle mode.
+ */
+int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
+{
+        int v;
+
+        /*
+         * XXX Rewrite this code to maintain a list of enabled
+         * downstream clocks for debugging purposes?
+         */
+
+        if (!clkdm || !clk)
+                return -EINVAL;
+
+#ifdef DEBUG
+        if (atomic_read(&clkdm->usecount) == 0) {
+                WARN_ON(1); /* underflow */
+                return -ERANGE;
+        }
+#endif
+
+        if (atomic_dec_return(&clkdm->usecount) > 0)
+                return 0;
+
+        /* All downstream clocks of this clockdomain are now disabled */
+
+        pr_debug("clockdomain: clkdm %s: clk %s now disabled\n", clkdm->name,
+                 clk->name);
+
+        v = omap2_clkdm_clktrctrl_read(clkdm);
+
+        if ((cpu_is_omap34xx() && v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ||
+            (cpu_is_omap24xx() && v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO))
+                _clkdm_del_autodeps(clkdm);
+        else
+                omap2_clkdm_sleep(clkdm);
+
+        return 0;
+}
+