#include <linux/errno.h>
#include <linux/err.h>
#include <linux/delay.h>
-#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/bitops.h>
#include <asm/cpu.h>
-#include <plat/prcm.h>
#include <trace/events/power.h>
#include "soc.h"
#include "clockdomain.h"
#include "clock.h"
-#include "cm2xxx_3xxx.h"
+#include "cm.h"
+#include "cm2xxx.h"
+#include "cm3xxx.h"
#include "cm-regbits-24xx.h"
#include "cm-regbits-34xx.h"
+#include "common.h"
+
+/*
+ * MAX_MODULE_ENABLE_WAIT: maximum of number of microseconds to wait
+ * for a module to indicate that it is no longer in idle
+ */
+#define MAX_MODULE_ENABLE_WAIT 100000
u16 cpu_mask;
*/
static bool clkdm_control = true;
-static LIST_HEAD(clocks);
-static DEFINE_MUTEX(clocks_mutex);
-static DEFINE_SPINLOCK(clockfw_lock);
+static LIST_HEAD(clk_hw_omap_clocks);
+
+/*
+ * Used for clocks that have the same value as the parent clock,
+ * divided by some factor
+ */
+unsigned long omap_fixed_divisor_recalc(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_hw_omap *oclk;
+
+ if (!hw) {
+ pr_warn("%s: hw is NULL\n", __func__);
+ return -EINVAL;
+ }
+
+ oclk = to_clk_hw_omap(hw);
+
+ WARN_ON(!oclk->fixed_div);
+
+ return parent_rate / oclk->fixed_div;
+}
/*
* OMAP2+ specific clock functions
/* Private functions */
+
+/**
+ * _wait_idlest_generic - wait for a module to leave the idle state
+ * @reg: virtual address of module IDLEST register
+ * @mask: value to mask against to determine if the module is active
+ * @idlest: idle state indicator (0 or 1) for the clock
+ * @name: name of the clock (for printk)
+ *
+ * Wait for a module to leave idle, where its idle-status register is
+ * not inside the CM module. Returns 1 if the module left idle
+ * promptly, or 0 if the module did not leave idle before the timeout
+ * elapsed. XXX Deprecated - should be moved into drivers for the
+ * individual IP block that the IDLEST register exists in.
+ */
+static int _wait_idlest_generic(void __iomem *reg, u32 mask, u8 idlest,
+ const char *name)
+{
+ int i = 0, ena = 0;
+
+ ena = (idlest) ? 0 : mask;
+
+ omap_test_timeout(((__raw_readl(reg) & mask) == ena),
+ MAX_MODULE_ENABLE_WAIT, i);
+
+ if (i < MAX_MODULE_ENABLE_WAIT)
+ pr_debug("omap clock: module associated with clock %s ready after %d loops\n",
+ name, i);
+ else
+ pr_err("omap clock: module associated with clock %s didn't enable in %d tries\n",
+ name, MAX_MODULE_ENABLE_WAIT);
+
+ return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0;
+};
+
/**
* _omap2_module_wait_ready - wait for an OMAP module to leave IDLE
* @clk: struct clk * belonging to the module
* belong in the clock code and will be moved in the medium term to
* module-dependent code. No return value.
*/
-static void _omap2_module_wait_ready(struct clk *clk)
+static void _omap2_module_wait_ready(struct clk_hw_omap *clk)
{
void __iomem *companion_reg, *idlest_reg;
- u8 other_bit, idlest_bit, idlest_val;
+ u8 other_bit, idlest_bit, idlest_val, idlest_reg_id;
+ s16 prcm_mod;
+ int r;
/* Not all modules have multiple clocks that their IDLEST depends on */
if (clk->ops->find_companion) {
}
clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);
-
- omap2_cm_wait_idlest(idlest_reg, (1 << idlest_bit), idlest_val,
- __clk_get_name(clk));
+ r = cm_split_idlest_reg(idlest_reg, &prcm_mod, &idlest_reg_id);
+ if (r) {
+ /* IDLEST register not in the CM module */
+ _wait_idlest_generic(idlest_reg, (1 << idlest_bit), idlest_val,
+ __clk_get_name(clk->hw.clk));
+ } else {
+ cm_wait_module_ready(prcm_mod, idlest_reg_id, idlest_bit);
+ };
}
/* Public functions */
* clockdomain pointer, and save it into the struct clk. Intended to be
* called during clk_register(). No return value.
*/
-void omap2_init_clk_clkdm(struct clk *clk)
+void omap2_init_clk_clkdm(struct clk_hw *hw)
{
+ struct clk_hw_omap *clk = to_clk_hw_omap(hw);
struct clockdomain *clkdm;
const char *clk_name;
if (!clk->clkdm_name)
return;
- clk_name = __clk_get_name(clk);
+ clk_name = __clk_get_name(hw->clk);
clkdm = clkdm_lookup(clk->clkdm_name);
if (clkdm) {
* associate this type of code with per-module data structures to
* avoid this issue, and remove the casts. No return value.
*/
-void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg,
- u8 *other_bit)
+void omap2_clk_dflt_find_companion(struct clk_hw_omap *clk,
+ void __iomem **other_reg, u8 *other_bit)
{
u32 r;
* register address ID (e.g., that CM_FCLKEN2 corresponds to
* CM_IDLEST2). This is not true for all modules. No return value.
*/
-void omap2_clk_dflt_find_idlest(struct clk *clk, void __iomem **idlest_reg,
- u8 *idlest_bit, u8 *idlest_val)
+void omap2_clk_dflt_find_idlest(struct clk_hw_omap *clk,
+ void __iomem **idlest_reg, u8 *idlest_bit, u8 *idlest_val)
{
u32 r;
}
-int omap2_dflt_clk_enable(struct clk *clk)
+/**
+ * omap2_dflt_clk_enable - enable a clock in the hardware
+ * @hw: struct clk_hw * of the clock to enable
+ *
+ * Enable the clock @hw in the hardware. We first call into the OMAP
+ * clockdomain code to "enable" the corresponding clockdomain if this
+ * is the first enabled user of the clockdomain. Then program the
+ * hardware to enable the clock. Then wait for the IP block that uses
+ * this clock to leave idle (if applicable). Returns the error value
+ * from clkdm_clk_enable() if it terminated with an error, or -EINVAL
+ * if @hw has a null clock enable_reg, or zero upon success.
+ */
+int omap2_dflt_clk_enable(struct clk_hw *hw)
{
+ struct clk_hw_omap *clk;
u32 v;
+ int ret = 0;
+
+ clk = to_clk_hw_omap(hw);
+
+ if (clkdm_control && clk->clkdm) {
+ ret = clkdm_clk_enable(clk->clkdm, hw->clk);
+ if (ret) {
+ WARN(1, "%s: could not enable %s's clockdomain %s: %d\n",
+ __func__, __clk_get_name(hw->clk),
+ clk->clkdm->name, ret);
+ return ret;
+ }
+ }
if (unlikely(clk->enable_reg == NULL)) {
- pr_err("clock.c: Enable for %s without enable code\n",
- clk->name);
- return 0; /* REVISIT: -EINVAL */
+ pr_err("%s: %s missing enable_reg\n", __func__,
+ __clk_get_name(hw->clk));
+ ret = -EINVAL;
+ goto err;
}
+ /* FIXME should not have INVERT_ENABLE bit here */
v = __raw_readl(clk->enable_reg);
if (clk->flags & INVERT_ENABLE)
v &= ~(1 << clk->enable_bit);
__raw_writel(v, clk->enable_reg);
v = __raw_readl(clk->enable_reg); /* OCP barrier */
- if (clk->ops->find_idlest)
+ if (clk->ops && clk->ops->find_idlest)
_omap2_module_wait_ready(clk);
return 0;
+
+err:
+ if (clkdm_control && clk->clkdm)
+ clkdm_clk_disable(clk->clkdm, hw->clk);
+ return ret;
}
-void omap2_dflt_clk_disable(struct clk *clk)
+/**
+ * omap2_dflt_clk_disable - disable a clock in the hardware
+ * @hw: struct clk_hw * of the clock to disable
+ *
+ * Disable the clock @hw in the hardware, and call into the OMAP
+ * clockdomain code to "disable" the corresponding clockdomain if all
+ * clocks/hwmods in that clockdomain are now disabled. No return
+ * value.
+ */
+void omap2_dflt_clk_disable(struct clk_hw *hw)
{
+ struct clk_hw_omap *clk;
u32 v;
+ clk = to_clk_hw_omap(hw);
if (!clk->enable_reg) {
/*
- * 'Independent' here refers to a clock which is not
+ * 'independent' here refers to a clock which is not
* controlled by its parent.
*/
- pr_err("clock: clk_disable called on independent clock %s which has no enable_reg\n", clk->name);
+ pr_err("%s: independent clock %s has no enable_reg\n",
+ __func__, __clk_get_name(hw->clk));
return;
}
v &= ~(1 << clk->enable_bit);
__raw_writel(v, clk->enable_reg);
/* No OCP barrier needed here since it is a disable operation */
-}
-const struct clkops clkops_omap2_dflt_wait = {
- .enable = omap2_dflt_clk_enable,
- .disable = omap2_dflt_clk_disable,
- .find_companion = omap2_clk_dflt_find_companion,
- .find_idlest = omap2_clk_dflt_find_idlest,
-};
-
-const struct clkops clkops_omap2_dflt = {
- .enable = omap2_dflt_clk_enable,
- .disable = omap2_dflt_clk_disable,
-};
+ if (clkdm_control && clk->clkdm)
+ clkdm_clk_disable(clk->clkdm, hw->clk);
+}
/**
- * omap2_clk_disable - disable a clock, if the system is not using it
- * @clk: struct clk * to disable
+ * omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw
+ * @hw: struct clk_hw * of the clock being enabled
*
- * Decrements the usecount on struct clk @clk. If there are no users
- * left, call the clkops-specific clock disable function to disable it
- * in hardware. If the clock is part of a clockdomain (which they all
- * should be), request that the clockdomain be disabled. (It too has
- * a usecount, and so will not be disabled in the hardware until it no
- * longer has any users.) If the clock has a parent clock (most of
- * them do), then call ourselves, recursing on the parent clock. This
- * can cause an entire branch of the clock tree to be powered off by
- * simply disabling one clock. Intended to be called with the clockfw_lock
- * spinlock held. No return value.
+ * Increment the usecount of the clockdomain of the clock pointed to
+ * by @hw; if the usecount is 1, the clockdomain will be "enabled."
+ * Only needed for clocks that don't use omap2_dflt_clk_enable() as
+ * their enable function pointer. Passes along the return value of
+ * clkdm_clk_enable(), -EINVAL if @hw is not associated with a
+ * clockdomain, or 0 if clock framework-based clockdomain control is
+ * not implemented.
*/
-void omap2_clk_disable(struct clk *clk)
+int omap2_clkops_enable_clkdm(struct clk_hw *hw)
{
- if (clk->usecount == 0) {
- WARN(1, "clock: %s: omap2_clk_disable() called, but usecount already 0?", clk->name);
- return;
- }
-
- pr_debug("clock: %s: decrementing usecount\n", clk->name);
+ struct clk_hw_omap *clk;
+ int ret = 0;
- clk->usecount--;
+ clk = to_clk_hw_omap(hw);
- if (clk->usecount > 0)
- return;
+ if (unlikely(!clk->clkdm)) {
+ pr_err("%s: %s: no clkdm set ?!\n", __func__,
+ __clk_get_name(hw->clk));
+ return -EINVAL;
+ }
- pr_debug("clock: %s: disabling in hardware\n", clk->name);
+ if (unlikely(clk->enable_reg))
+ pr_err("%s: %s: should use dflt_clk_enable ?!\n", __func__,
+ __clk_get_name(hw->clk));
- if (clk->ops && clk->ops->disable) {
- trace_clock_disable(clk->name, 0, smp_processor_id());
- clk->ops->disable(clk);
+ if (!clkdm_control) {
+ pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
+ __func__, __clk_get_name(hw->clk));
+ return 0;
}
- if (clkdm_control && clk->clkdm)
- clkdm_clk_disable(clk->clkdm, clk);
+ ret = clkdm_clk_enable(clk->clkdm, hw->clk);
+ WARN(ret, "%s: could not enable %s's clockdomain %s: %d\n",
+ __func__, __clk_get_name(hw->clk), clk->clkdm->name, ret);
- if (clk->parent)
- omap2_clk_disable(clk->parent);
+ return ret;
}
/**
- * omap2_clk_enable - request that the system enable a clock
- * @clk: struct clk * to enable
+ * omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw
+ * @hw: struct clk_hw * of the clock being disabled
*
- * Increments the usecount on struct clk @clk. If there were no users
- * previously, then recurse up the clock tree, enabling all of the
- * clock's parents and all of the parent clockdomains, and finally,
- * enabling @clk's clockdomain, and @clk itself. Intended to be
- * called with the clockfw_lock spinlock held. Returns 0 upon success
- * or a negative error code upon failure.
+ * Decrement the usecount of the clockdomain of the clock pointed to
+ * by @hw; if the usecount is 0, the clockdomain will be "disabled."
+ * Only needed for clocks that don't use omap2_dflt_clk_disable() as their
+ * disable function pointer. No return value.
*/
-int omap2_clk_enable(struct clk *clk)
+void omap2_clkops_disable_clkdm(struct clk_hw *hw)
{
- int ret;
-
- pr_debug("clock: %s: incrementing usecount\n", clk->name);
-
- clk->usecount++;
-
- if (clk->usecount > 1)
- return 0;
+ struct clk_hw_omap *clk;
- pr_debug("clock: %s: enabling in hardware\n", clk->name);
+ clk = to_clk_hw_omap(hw);
- if (clk->parent) {
- ret = omap2_clk_enable(clk->parent);
- if (ret) {
- WARN(1, "clock: %s: could not enable parent %s: %d\n",
- clk->name, clk->parent->name, ret);
- goto oce_err1;
- }
+ if (unlikely(!clk->clkdm)) {
+ pr_err("%s: %s: no clkdm set ?!\n", __func__,
+ __clk_get_name(hw->clk));
+ return;
}
- if (clkdm_control && clk->clkdm) {
- ret = clkdm_clk_enable(clk->clkdm, clk);
- if (ret) {
- WARN(1, "clock: %s: could not enable clockdomain %s: %d\n",
- clk->name, clk->clkdm->name, ret);
- goto oce_err2;
- }
- }
+ if (unlikely(clk->enable_reg))
+ pr_err("%s: %s: should use dflt_clk_disable ?!\n", __func__,
+ __clk_get_name(hw->clk));
- if (clk->ops && clk->ops->enable) {
- trace_clock_enable(clk->name, 1, smp_processor_id());
- ret = clk->ops->enable(clk);
- if (ret) {
- WARN(1, "clock: %s: could not enable: %d\n",
- clk->name, ret);
- goto oce_err3;
- }
+ if (!clkdm_control) {
+ pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
+ __func__, __clk_get_name(hw->clk));
+ return;
}
- return 0;
-
-oce_err3:
- if (clkdm_control && clk->clkdm)
- clkdm_clk_disable(clk->clkdm, clk);
-oce_err2:
- if (clk->parent)
- omap2_clk_disable(clk->parent);
-oce_err1:
- clk->usecount--;
-
- return ret;
+ clkdm_clk_disable(clk->clkdm, hw->clk);
}
-/* Given a clock and a rate apply a clock specific rounding function */
-long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
+/**
+ * omap2_dflt_clk_is_enabled - is clock enabled in the hardware?
+ * @hw: struct clk_hw * to check
+ *
+ * Return 1 if the clock represented by @hw is enabled in the
+ * hardware, or 0 otherwise. Intended for use in the struct
+ * clk_ops.is_enabled function pointer.
+ */
+int omap2_dflt_clk_is_enabled(struct clk_hw *hw)
{
- if (clk->round_rate)
- return clk->round_rate(clk, rate);
+ struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+ u32 v;
+
+ v = __raw_readl(clk->enable_reg);
+
+ if (clk->flags & INVERT_ENABLE)
+ v ^= BIT(clk->enable_bit);
- return clk->rate;
+ v &= BIT(clk->enable_bit);
+
+ return v ? 1 : 0;
}
-/* Set the clock rate for a clock source */
-int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
+static int __initdata mpurate;
+
+/*
+ * By default we use the rate set by the bootloader.
+ * You can override this with mpurate= cmdline option.
+ */
+static int __init omap_clk_setup(char *str)
{
- int ret = -EINVAL;
+ get_option(&str, &mpurate);
- pr_debug("clock: set_rate for clock %s to rate %ld\n", clk->name, rate);
+ if (!mpurate)
+ return 1;
- /* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
- if (clk->set_rate) {
- trace_clock_set_rate(clk->name, rate, smp_processor_id());
- ret = clk->set_rate(clk, rate);
- }
+ if (mpurate < 1000)
+ mpurate *= 1000000;
- return ret;
+ return 1;
}
+__setup("mpurate=", omap_clk_setup);
-int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
+/**
+ * omap2_init_clk_hw_omap_clocks - initialize an OMAP clock
+ * @clk: struct clk * to initialize
+ *
+ * Add an OMAP clock @clk to the internal list of OMAP clocks. Used
+ * temporarily for autoidle handling, until this support can be
+ * integrated into the common clock framework code in some way. No
+ * return value.
+ */
+void omap2_init_clk_hw_omap_clocks(struct clk *clk)
{
- if (!clk->clksel)
- return -EINVAL;
+ struct clk_hw_omap *c;
- if (clk->parent == new_parent)
- return 0;
+ if (__clk_get_flags(clk) & CLK_IS_BASIC)
+ return;
- return omap2_clksel_set_parent(clk, new_parent);
+ c = to_clk_hw_omap(__clk_get_hw(clk));
+ list_add(&c->node, &clk_hw_omap_clocks);
}
-/*
- * OMAP2+ clock reset and init functions
+/**
+ * omap2_clk_enable_autoidle_all - enable autoidle on all OMAP clocks that
+ * support it
+ *
+ * Enable clock autoidle on all OMAP clocks that have allow_idle
+ * function pointers associated with them. This function is intended
+ * to be temporary until support for this is added to the common clock
+ * code. Returns 0.
*/
+int omap2_clk_enable_autoidle_all(void)
+{
+ struct clk_hw_omap *c;
+
+ list_for_each_entry(c, &clk_hw_omap_clocks, node)
+ if (c->ops && c->ops->allow_idle)
+ c->ops->allow_idle(c);
+ return 0;
+}
-#ifdef CONFIG_OMAP_RESET_CLOCKS
-void omap2_clk_disable_unused(struct clk *clk)
+/**
+ * omap2_clk_disable_autoidle_all - disable autoidle on all OMAP clocks that
+ * support it
+ *
+ * Disable clock autoidle on all OMAP clocks that have allow_idle
+ * function pointers associated with them. This function is intended
+ * to be temporary until support for this is added to the common clock
+ * code. Returns 0.
+ */
+int omap2_clk_disable_autoidle_all(void)
{
- u32 regval32, v;
+ struct clk_hw_omap *c;
- v = (clk->flags & INVERT_ENABLE) ? (1 << clk->enable_bit) : 0;
+ list_for_each_entry(c, &clk_hw_omap_clocks, node)
+ if (c->ops && c->ops->deny_idle)
+ c->ops->deny_idle(c);
+ return 0;
+}
- regval32 = __raw_readl(clk->enable_reg);
- if ((regval32 & (1 << clk->enable_bit)) == v)
- return;
+/**
+ * omap2_clk_enable_init_clocks - prepare & enable a list of clocks
+ * @clk_names: ptr to an array of strings of clock names to enable
+ * @num_clocks: number of clock names in @clk_names
+ *
+ * Prepare and enable a list of clocks, named by @clk_names. No
+ * return value. XXX Deprecated; only needed until these clocks are
+ * properly claimed and enabled by the drivers or core code that uses
+ * them. XXX What code disables & calls clk_put on these clocks?
+ */
+void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
+{
+ struct clk *init_clk;
+ int i;
- pr_debug("Disabling unused clock \"%s\"\n", clk->name);
- if (cpu_is_omap34xx()) {
- omap2_clk_enable(clk);
- omap2_clk_disable(clk);
- } else {
- clk->ops->disable(clk);
+ for (i = 0; i < num_clocks; i++) {
+ init_clk = clk_get(NULL, clk_names[i]);
+ clk_prepare_enable(init_clk);
}
- if (clk->clkdm != NULL)
- pwrdm_state_switch(clk->clkdm->pwrdm.ptr);
}
-#endif
+
+const struct clk_hw_omap_ops clkhwops_wait = {
+ .find_idlest = omap2_clk_dflt_find_idlest,
+ .find_companion = omap2_clk_dflt_find_companion,
+};
/**
* omap2_clk_switch_mpurate_at_boot - switch ARM MPU rate by boot-time argument
r = clk_set_rate(mpurate_ck, mpurate);
if (IS_ERR_VALUE(r)) {
WARN(1, "clock: %s: unable to set MPU rate to %d: %d\n",
- mpurate_ck->name, mpurate, r);
+ mpurate_ck_name, mpurate, r);
clk_put(mpurate_ck);
return -EINVAL;
}
calibrate_delay();
- recalculate_root_clocks();
-
clk_put(mpurate_ck);
return 0;
(clk_get_rate(core_ck) / 1000000),
(clk_get_rate(mpu_ck) / 1000000));
}
-
-/* Common data */
-
-int clk_enable(struct clk *clk)
-{
- unsigned long flags;
- int ret;
-
- if (clk == NULL || IS_ERR(clk))
- return -EINVAL;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- ret = omap2_clk_enable(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_enable);
-
-void clk_disable(struct clk *clk)
-{
- unsigned long flags;
-
- if (clk == NULL || IS_ERR(clk))
- return;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- if (clk->usecount == 0) {
- pr_err("Trying disable clock %s with 0 usecount\n",
- clk->name);
- WARN_ON(1);
- goto out;
- }
-
- omap2_clk_disable(clk);
-
-out:
- spin_unlock_irqrestore(&clockfw_lock, flags);
-}
-EXPORT_SYMBOL(clk_disable);
-
-unsigned long clk_get_rate(struct clk *clk)
-{
- unsigned long flags;
- unsigned long ret;
-
- if (clk == NULL || IS_ERR(clk))
- return 0;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- ret = clk->rate;
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_get_rate);
-
-/*
- * Optional clock functions defined in include/linux/clk.h
- */
-
-long clk_round_rate(struct clk *clk, unsigned long rate)
-{
- unsigned long flags;
- long ret;
-
- if (clk == NULL || IS_ERR(clk))
- return 0;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- ret = omap2_clk_round_rate(clk, rate);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_round_rate);
-
-int clk_set_rate(struct clk *clk, unsigned long rate)
-{
- unsigned long flags;
- int ret = -EINVAL;
-
- if (clk == NULL || IS_ERR(clk))
- return ret;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- ret = omap2_clk_set_rate(clk, rate);
- if (ret == 0)
- propagate_rate(clk);
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_set_rate);
-
-int clk_set_parent(struct clk *clk, struct clk *parent)
-{
- unsigned long flags;
- int ret = -EINVAL;
-
- if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent))
- return ret;
-
- spin_lock_irqsave(&clockfw_lock, flags);
- if (clk->usecount == 0) {
- ret = omap2_clk_set_parent(clk, parent);
- if (ret == 0)
- propagate_rate(clk);
- } else {
- ret = -EBUSY;
- }
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return ret;
-}
-EXPORT_SYMBOL(clk_set_parent);
-
-struct clk *clk_get_parent(struct clk *clk)
-{
- return clk->parent;
-}
-EXPORT_SYMBOL(clk_get_parent);
-
-/*
- * OMAP specific clock functions shared between omap1 and omap2
- */
-
-int __initdata mpurate;
-
-/*
- * By default we use the rate set by the bootloader.
- * You can override this with mpurate= cmdline option.
- */
-static int __init omap_clk_setup(char *str)
-{
- get_option(&str, &mpurate);
-
- if (!mpurate)
- return 1;
-
- if (mpurate < 1000)
- mpurate *= 1000000;
-
- return 1;
-}
-__setup("mpurate=", omap_clk_setup);
-
-/* Used for clocks that always have same value as the parent clock */
-unsigned long followparent_recalc(struct clk *clk)
-{
- return clk->parent->rate;
-}
-
-/*
- * Used for clocks that have the same value as the parent clock,
- * divided by some factor
- */
-unsigned long omap_fixed_divisor_recalc(struct clk *clk)
-{
- WARN_ON(!clk->fixed_div);
-
- return clk->parent->rate / clk->fixed_div;
-}
-
-void clk_reparent(struct clk *child, struct clk *parent)
-{
- list_del_init(&child->sibling);
- if (parent)
- list_add(&child->sibling, &parent->children);
- child->parent = parent;
-
- /* now do the debugfs renaming to reattach the child
- to the proper parent */
-}
-
-/* Propagate rate to children */
-void propagate_rate(struct clk *tclk)
-{
- struct clk *clkp;
-
- list_for_each_entry(clkp, &tclk->children, sibling) {
- if (clkp->recalc)
- clkp->rate = clkp->recalc(clkp);
- propagate_rate(clkp);
- }
-}
-
-static LIST_HEAD(root_clks);
-
-/**
- * recalculate_root_clocks - recalculate and propagate all root clocks
- *
- * Recalculates all root clocks (clocks with no parent), which if the
- * clock's .recalc is set correctly, should also propagate their rates.
- * Called at init.
- */
-void recalculate_root_clocks(void)
-{
- struct clk *clkp;
-
- list_for_each_entry(clkp, &root_clks, sibling) {
- if (clkp->recalc)
- clkp->rate = clkp->recalc(clkp);
- propagate_rate(clkp);
- }
-}
-
-/**
- * clk_preinit - initialize any fields in the struct clk before clk init
- * @clk: struct clk * to initialize
- *
- * Initialize any struct clk fields needed before normal clk initialization
- * can run. No return value.
- */
-void clk_preinit(struct clk *clk)
-{
- INIT_LIST_HEAD(&clk->children);
-}
-
-int clk_register(struct clk *clk)
-{
- if (clk == NULL || IS_ERR(clk))
- return -EINVAL;
-
- /*
- * trap out already registered clocks
- */
- if (clk->node.next || clk->node.prev)
- return 0;
-
- mutex_lock(&clocks_mutex);
- if (clk->parent)
- list_add(&clk->sibling, &clk->parent->children);
- else
- list_add(&clk->sibling, &root_clks);
-
- list_add(&clk->node, &clocks);
- if (clk->init)
- clk->init(clk);
- mutex_unlock(&clocks_mutex);
-
- return 0;
-}
-EXPORT_SYMBOL(clk_register);
-
-void clk_unregister(struct clk *clk)
-{
- if (clk == NULL || IS_ERR(clk))
- return;
-
- mutex_lock(&clocks_mutex);
- list_del(&clk->sibling);
- list_del(&clk->node);
- mutex_unlock(&clocks_mutex);
-}
-EXPORT_SYMBOL(clk_unregister);
-
-void clk_enable_init_clocks(void)
-{
- struct clk *clkp;
-
- list_for_each_entry(clkp, &clocks, node)
- if (clkp->flags & ENABLE_ON_INIT)
- clk_enable(clkp);
-}
-
-/**
- * omap_clk_get_by_name - locate OMAP struct clk by its name
- * @name: name of the struct clk to locate
- *
- * Locate an OMAP struct clk by its name. Assumes that struct clk
- * names are unique. Returns NULL if not found or a pointer to the
- * struct clk if found.
- */
-struct clk *omap_clk_get_by_name(const char *name)
-{
- struct clk *c;
- struct clk *ret = NULL;
-
- mutex_lock(&clocks_mutex);
-
- list_for_each_entry(c, &clocks, node) {
- if (!strcmp(c->name, name)) {
- ret = c;
- break;
- }
- }
-
- mutex_unlock(&clocks_mutex);
-
- return ret;
-}
-
-int omap_clk_enable_autoidle_all(void)
-{
- struct clk *c;
- unsigned long flags;
-
- spin_lock_irqsave(&clockfw_lock, flags);
-
- list_for_each_entry(c, &clocks, node)
- if (c->ops->allow_idle)
- c->ops->allow_idle(c);
-
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return 0;
-}
-
-int omap_clk_disable_autoidle_all(void)
-{
- struct clk *c;
- unsigned long flags;
-
- spin_lock_irqsave(&clockfw_lock, flags);
-
- list_for_each_entry(c, &clocks, node)
- if (c->ops->deny_idle)
- c->ops->deny_idle(c);
-
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return 0;
-}
-
-/*
- * Low level helpers
- */
-static int clkll_enable_null(struct clk *clk)
-{
- return 0;
-}
-
-static void clkll_disable_null(struct clk *clk)
-{
-}
-
-const struct clkops clkops_null = {
- .enable = clkll_enable_null,
- .disable = clkll_disable_null,
-};
-
-/*
- * Dummy clock
- *
- * Used for clock aliases that are needed on some OMAPs, but not others
- */
-struct clk dummy_ck = {
- .name = "dummy",
- .ops = &clkops_null,
-};
-
-/*
- *
- */
-
-#ifdef CONFIG_OMAP_RESET_CLOCKS
-/*
- * Disable any unused clocks left on by the bootloader
- */
-static int __init clk_disable_unused(void)
-{
- struct clk *ck;
- unsigned long flags;
-
- pr_info("clock: disabling unused clocks to save power\n");
-
- spin_lock_irqsave(&clockfw_lock, flags);
- list_for_each_entry(ck, &clocks, node) {
- if (ck->ops == &clkops_null)
- continue;
-
- if (ck->usecount > 0 || !ck->enable_reg)
- continue;
-
- omap2_clk_disable_unused(ck);
- }
- spin_unlock_irqrestore(&clockfw_lock, flags);
-
- return 0;
-}
-late_initcall(clk_disable_unused);
-late_initcall(omap_clk_enable_autoidle_all);
-#endif
-
-#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
-/*
- * debugfs support to trace clock tree hierarchy and attributes
- */
-
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-
-static struct dentry *clk_debugfs_root;
-
-static int clk_dbg_show_summary(struct seq_file *s, void *unused)
-{
- struct clk *c;
- struct clk *pa;
-
- mutex_lock(&clocks_mutex);
- seq_printf(s, "%-30s %-30s %-10s %s\n",
- "clock-name", "parent-name", "rate", "use-count");
-
- list_for_each_entry(c, &clocks, node) {
- pa = c->parent;
- seq_printf(s, "%-30s %-30s %-10lu %d\n",
- c->name, pa ? pa->name : "none", c->rate,
- c->usecount);
- }
- mutex_unlock(&clocks_mutex);
-
- return 0;
-}
-
-static int clk_dbg_open(struct inode *inode, struct file *file)
-{
- return single_open(file, clk_dbg_show_summary, inode->i_private);
-}
-
-static const struct file_operations debug_clock_fops = {
- .open = clk_dbg_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static int clk_debugfs_register_one(struct clk *c)
-{
- int err;
- struct dentry *d;
- struct clk *pa = c->parent;
-
- d = debugfs_create_dir(c->name, pa ? pa->dent : clk_debugfs_root);
- if (!d)
- return -ENOMEM;
- c->dent = d;
-
- d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usecount);
- if (!d) {
- err = -ENOMEM;
- goto err_out;
- }
- d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
- if (!d) {
- err = -ENOMEM;
- goto err_out;
- }
- d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags);
- if (!d) {
- err = -ENOMEM;
- goto err_out;
- }
- return 0;
-
-err_out:
- debugfs_remove_recursive(c->dent);
- return err;
-}
-
-static int clk_debugfs_register(struct clk *c)
-{
- int err;
- struct clk *pa = c->parent;
-
- if (pa && !pa->dent) {
- err = clk_debugfs_register(pa);
- if (err)
- return err;
- }
-
- if (!c->dent) {
- err = clk_debugfs_register_one(c);
- if (err)
- return err;
- }
- return 0;
-}
-
-static int __init clk_debugfs_init(void)
-{
- struct clk *c;
- struct dentry *d;
- int err;
-
- d = debugfs_create_dir("clock", NULL);
- if (!d)
- return -ENOMEM;
- clk_debugfs_root = d;
-
- list_for_each_entry(c, &clocks, node) {
- err = clk_debugfs_register(c);
- if (err)
- goto err_out;
- }
-
- d = debugfs_create_file("summary", S_IRUGO,
- d, NULL, &debug_clock_fops);
- if (!d)
- return -ENOMEM;
-
- return 0;
-err_out:
- debugfs_remove_recursive(clk_debugfs_root);
- return err;
-}
-late_initcall(clk_debugfs_init);
-
-#endif /* defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) */
-
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