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-rw-r--r--kernel/arch/arm/mach-omap2/clock.c849
1 files changed, 849 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/clock.c b/kernel/arch/arm/mach-omap2/clock.c
new file mode 100644
index 000000000..a699d7169
--- /dev/null
+++ b/kernel/arch/arm/mach-omap2/clock.c
@@ -0,0 +1,849 @@
+/*
+ * linux/arch/arm/mach-omap2/clock.c
+ *
+ * Copyright (C) 2005-2008 Texas Instruments, Inc.
+ * Copyright (C) 2004-2010 Nokia Corporation
+ *
+ * Contacts:
+ * Richard Woodruff <r-woodruff2@ti.com>
+ * 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.
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/bitops.h>
+#include <linux/regmap.h>
+#include <linux/of_address.h>
+#include <linux/bootmem.h>
+#include <asm/cpu.h>
+
+#include <trace/events/power.h>
+
+#include "soc.h"
+#include "clockdomain.h"
+#include "clock.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;
+
+/*
+ * Clock features setup. Used instead of CPU type checks.
+ */
+struct ti_clk_features ti_clk_features;
+
+/* DPLL valid Fint frequency band limits - from 34xx TRM Section 4.7.6.2 */
+#define OMAP3430_DPLL_FINT_BAND1_MIN 750000
+#define OMAP3430_DPLL_FINT_BAND1_MAX 2100000
+#define OMAP3430_DPLL_FINT_BAND2_MIN 7500000
+#define OMAP3430_DPLL_FINT_BAND2_MAX 21000000
+
+/*
+ * DPLL valid Fint frequency range for OMAP36xx and OMAP4xxx.
+ * From device data manual section 4.3 "DPLL and DLL Specifications".
+ */
+#define OMAP3PLUS_DPLL_FINT_MIN 32000
+#define OMAP3PLUS_DPLL_FINT_MAX 52000000
+
+/*
+ * clkdm_control: if true, then when a clock is enabled in the
+ * hardware, its clockdomain will first be enabled; and when a clock
+ * is disabled in the hardware, its clockdomain will be disabled
+ * afterwards.
+ */
+static bool clkdm_control = true;
+
+static LIST_HEAD(clk_hw_omap_clocks);
+
+struct clk_iomap {
+ struct regmap *regmap;
+ void __iomem *mem;
+};
+
+static struct clk_iomap *clk_memmaps[CLK_MAX_MEMMAPS];
+
+static void clk_memmap_writel(u32 val, void __iomem *reg)
+{
+ struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
+ struct clk_iomap *io = clk_memmaps[r->index];
+
+ if (io->regmap)
+ regmap_write(io->regmap, r->offset, val);
+ else
+ writel_relaxed(val, io->mem + r->offset);
+}
+
+static u32 clk_memmap_readl(void __iomem *reg)
+{
+ u32 val;
+ struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
+ struct clk_iomap *io = clk_memmaps[r->index];
+
+ if (io->regmap)
+ regmap_read(io->regmap, r->offset, &val);
+ else
+ val = readl_relaxed(io->mem + r->offset);
+
+ return val;
+}
+
+void omap2_clk_writel(u32 val, struct clk_hw_omap *clk, void __iomem *reg)
+{
+ if (WARN_ON_ONCE(!(clk->flags & MEMMAP_ADDRESSING)))
+ writel_relaxed(val, reg);
+ else
+ clk_memmap_writel(val, reg);
+}
+
+u32 omap2_clk_readl(struct clk_hw_omap *clk, void __iomem *reg)
+{
+ if (WARN_ON_ONCE(!(clk->flags & MEMMAP_ADDRESSING)))
+ return readl_relaxed(reg);
+ else
+ return clk_memmap_readl(reg);
+}
+
+static struct ti_clk_ll_ops omap_clk_ll_ops = {
+ .clk_readl = clk_memmap_readl,
+ .clk_writel = clk_memmap_writel,
+};
+
+/**
+ * omap2_clk_provider_init - initialize a clock provider
+ * @match_table: DT device table to match for devices to init
+ * @np: device node pointer for the this clock provider
+ * @index: index for the clock provider
+ + @syscon: syscon regmap pointer
+ * @mem: iomem pointer for the clock provider memory area, only used if
+ * syscon is not provided
+ *
+ * Initializes a clock provider module (CM/PRM etc.), registering
+ * the memory mapping at specified index and initializing the
+ * low level driver infrastructure. Returns 0 in success.
+ */
+int __init omap2_clk_provider_init(struct device_node *np, int index,
+ struct regmap *syscon, void __iomem *mem)
+{
+ struct clk_iomap *io;
+
+ ti_clk_ll_ops = &omap_clk_ll_ops;
+
+ io = kzalloc(sizeof(*io), GFP_KERNEL);
+
+ io->regmap = syscon;
+ io->mem = mem;
+
+ clk_memmaps[index] = io;
+
+ ti_dt_clk_init_provider(np, index);
+
+ return 0;
+}
+
+/**
+ * omap2_clk_legacy_provider_init - initialize a legacy clock provider
+ * @index: index for the clock provider
+ * @mem: iomem pointer for the clock provider memory area
+ *
+ * Initializes a legacy clock provider memory mapping.
+ */
+void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
+{
+ struct clk_iomap *io;
+
+ ti_clk_ll_ops = &omap_clk_ll_ops;
+
+ io = memblock_virt_alloc(sizeof(*io), 0);
+
+ io->mem = mem;
+
+ clk_memmaps[index] = io;
+}
+
+/*
+ * OMAP2+ specific clock functions
+ */
+
+/* Private functions */
+
+
+/**
+ * _wait_idlest_generic - wait for a module to leave the idle state
+ * @clk: module clock to wait for (needed for register offsets)
+ * @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(struct clk_hw_omap *clk, void __iomem *reg,
+ u32 mask, u8 idlest, const char *name)
+{
+ int i = 0, ena = 0;
+
+ ena = (idlest) ? 0 : mask;
+
+ omap_test_timeout(((omap2_clk_readl(clk, 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
+ *
+ * If the necessary clocks for the OMAP hardware IP block that
+ * corresponds to clock @clk are enabled, then wait for the module to
+ * indicate readiness (i.e., to leave IDLE). This code does not
+ * 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_hw_omap *clk)
+{
+ void __iomem *companion_reg, *idlest_reg;
+ 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_companion(clk, &companion_reg, &other_bit);
+ if (!(omap2_clk_readl(clk, companion_reg) & (1 << other_bit)))
+ return;
+ }
+
+ clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val);
+ r = cm_split_idlest_reg(idlest_reg, &prcm_mod, &idlest_reg_id);
+ if (r) {
+ /* IDLEST register not in the CM module */
+ _wait_idlest_generic(clk, idlest_reg, (1 << idlest_bit),
+ idlest_val, __clk_get_name(clk->hw.clk));
+ } else {
+ omap_cm_wait_module_ready(0, prcm_mod, idlest_reg_id,
+ idlest_bit);
+ };
+}
+
+/* Public functions */
+
+/**
+ * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
+ * @clk: OMAP clock struct ptr to use
+ *
+ * Convert a clockdomain name stored in a struct clk 'clk' into a
+ * 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_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(hw->clk);
+
+ clkdm = clkdm_lookup(clk->clkdm_name);
+ if (clkdm) {
+ pr_debug("clock: associated clk %s to clkdm %s\n",
+ clk_name, clk->clkdm_name);
+ clk->clkdm = clkdm;
+ } else {
+ pr_debug("clock: could not associate clk %s to clkdm %s\n",
+ clk_name, clk->clkdm_name);
+ }
+}
+
+/**
+ * omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable
+ *
+ * Prevent the OMAP clock code from calling into the clockdomain code
+ * when a hardware clock in that clockdomain is enabled or disabled.
+ * Intended to be called at init time from omap*_clk_init(). No
+ * return value.
+ */
+void __init omap2_clk_disable_clkdm_control(void)
+{
+ clkdm_control = false;
+}
+
+/**
+ * omap2_clk_dflt_find_companion - find companion clock to @clk
+ * @clk: struct clk * to find the companion clock of
+ * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
+ * @other_bit: u8 ** to return the companion clock bit shift in
+ *
+ * Note: We don't need special code here for INVERT_ENABLE for the
+ * time being since INVERT_ENABLE only applies to clocks enabled by
+ * CM_CLKEN_PLL
+ *
+ * Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes it's
+ * just a matter of XORing the bits.
+ *
+ * Some clocks don't have companion clocks. For example, modules with
+ * only an interface clock (such as MAILBOXES) don't have a companion
+ * clock. Right now, this code relies on the hardware exporting a bit
+ * in the correct companion register that indicates that the
+ * nonexistent 'companion clock' is active. Future patches will
+ * 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_hw_omap *clk,
+ void __iomem **other_reg, u8 *other_bit)
+{
+ u32 r;
+
+ /*
+ * Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes
+ * it's just a matter of XORing the bits.
+ */
+ r = ((__force u32)clk->enable_reg ^ (CM_FCLKEN ^ CM_ICLKEN));
+
+ *other_reg = (__force void __iomem *)r;
+ *other_bit = clk->enable_bit;
+}
+
+/**
+ * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk
+ * @clk: struct clk * to find IDLEST info for
+ * @idlest_reg: void __iomem ** to return the CM_IDLEST va in
+ * @idlest_bit: u8 * to return the CM_IDLEST bit shift in
+ * @idlest_val: u8 * to return the idle status indicator
+ *
+ * Return the CM_IDLEST register address and bit shift corresponding
+ * to the module that "owns" this clock. This default code assumes
+ * that the CM_IDLEST bit shift is the CM_*CLKEN bit shift, and that
+ * the IDLEST register address ID corresponds to the CM_*CLKEN
+ * 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_hw_omap *clk,
+ void __iomem **idlest_reg, u8 *idlest_bit, u8 *idlest_val)
+{
+ u32 r;
+
+ r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20);
+ *idlest_reg = (__force void __iomem *)r;
+ *idlest_bit = clk->enable_bit;
+
+ /*
+ * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
+ * 34xx reverses this, just to keep us on our toes
+ * AM35xx uses both, depending on the module.
+ */
+ *idlest_val = ti_clk_features.cm_idlest_val;
+}
+
+/**
+ * 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("%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 = omap2_clk_readl(clk, clk->enable_reg);
+ if (clk->flags & INVERT_ENABLE)
+ v &= ~(1 << clk->enable_bit);
+ else
+ v |= (1 << clk->enable_bit);
+ omap2_clk_writel(v, clk, clk->enable_reg);
+ v = omap2_clk_readl(clk, clk->enable_reg); /* OCP barrier */
+
+ 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;
+}
+
+/**
+ * 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
+ * controlled by its parent.
+ */
+ pr_err("%s: independent clock %s has no enable_reg\n",
+ __func__, __clk_get_name(hw->clk));
+ return;
+ }
+
+ v = omap2_clk_readl(clk, clk->enable_reg);
+ if (clk->flags & INVERT_ENABLE)
+ v |= (1 << clk->enable_bit);
+ else
+ v &= ~(1 << clk->enable_bit);
+ omap2_clk_writel(v, clk, clk->enable_reg);
+ /* No OCP barrier needed here since it is a disable operation */
+
+ if (clkdm_control && clk->clkdm)
+ clkdm_clk_disable(clk->clkdm, hw->clk);
+}
+
+/**
+ * omap2_clkops_enable_clkdm - increment usecount on clkdm of @hw
+ * @hw: struct clk_hw * of the clock being enabled
+ *
+ * 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.
+ */
+int omap2_clkops_enable_clkdm(struct clk_hw *hw)
+{
+ struct clk_hw_omap *clk;
+ int ret = 0;
+
+ clk = to_clk_hw_omap(hw);
+
+ if (unlikely(!clk->clkdm)) {
+ pr_err("%s: %s: no clkdm set ?!\n", __func__,
+ __clk_get_name(hw->clk));
+ return -EINVAL;
+ }
+
+ if (unlikely(clk->enable_reg))
+ pr_err("%s: %s: should use dflt_clk_enable ?!\n", __func__,
+ __clk_get_name(hw->clk));
+
+ if (!clkdm_control) {
+ pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
+ __func__, __clk_get_name(hw->clk));
+ return 0;
+ }
+
+ 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);
+
+ return ret;
+}
+
+/**
+ * omap2_clkops_disable_clkdm - decrement usecount on clkdm of @hw
+ * @hw: struct clk_hw * of the clock being disabled
+ *
+ * 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.
+ */
+void omap2_clkops_disable_clkdm(struct clk_hw *hw)
+{
+ struct clk_hw_omap *clk;
+
+ clk = to_clk_hw_omap(hw);
+
+ if (unlikely(!clk->clkdm)) {
+ pr_err("%s: %s: no clkdm set ?!\n", __func__,
+ __clk_get_name(hw->clk));
+ return;
+ }
+
+ if (unlikely(clk->enable_reg))
+ pr_err("%s: %s: should use dflt_clk_disable ?!\n", __func__,
+ __clk_get_name(hw->clk));
+
+ if (!clkdm_control) {
+ pr_err("%s: %s: clkfw-based clockdomain control disabled ?!\n",
+ __func__, __clk_get_name(hw->clk));
+ return;
+ }
+
+ clkdm_clk_disable(clk->clkdm, hw->clk);
+}
+
+/**
+ * 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)
+{
+ struct clk_hw_omap *clk = to_clk_hw_omap(hw);
+ u32 v;
+
+ v = omap2_clk_readl(clk, clk->enable_reg);
+
+ if (clk->flags & INVERT_ENABLE)
+ v ^= BIT(clk->enable_bit);
+
+ v &= BIT(clk->enable_bit);
+
+ return v ? 1 : 0;
+}
+
+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)
+{
+ get_option(&str, &mpurate);
+
+ if (!mpurate)
+ return 1;
+
+ if (mpurate < 1000)
+ mpurate *= 1000000;
+
+ return 1;
+}
+__setup("mpurate=", omap_clk_setup);
+
+/**
+ * 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)
+{
+ struct clk_hw_omap *c;
+
+ if (__clk_get_flags(clk) & CLK_IS_BASIC)
+ return;
+
+ c = to_clk_hw_omap(__clk_get_hw(clk));
+ list_add(&c->node, &clk_hw_omap_clocks);
+}
+
+/**
+ * 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);
+
+ of_ti_clk_allow_autoidle_all();
+
+ return 0;
+}
+
+/**
+ * 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)
+{
+ struct clk_hw_omap *c;
+
+ list_for_each_entry(c, &clk_hw_omap_clocks, node)
+ if (c->ops && c->ops->deny_idle)
+ c->ops->deny_idle(c);
+
+ of_ti_clk_deny_autoidle_all();
+
+ return 0;
+}
+
+/**
+ * omap2_clk_deny_idle - disable autoidle on an OMAP clock
+ * @clk: struct clk * to disable autoidle for
+ *
+ * Disable autoidle on an OMAP clock.
+ */
+int omap2_clk_deny_idle(struct clk *clk)
+{
+ struct clk_hw_omap *c;
+
+ if (__clk_get_flags(clk) & CLK_IS_BASIC)
+ return -EINVAL;
+
+ c = to_clk_hw_omap(__clk_get_hw(clk));
+ if (c->ops && c->ops->deny_idle)
+ c->ops->deny_idle(c);
+ return 0;
+}
+
+/**
+ * omap2_clk_allow_idle - enable autoidle on an OMAP clock
+ * @clk: struct clk * to enable autoidle for
+ *
+ * Enable autoidle on an OMAP clock.
+ */
+int omap2_clk_allow_idle(struct clk *clk)
+{
+ struct clk_hw_omap *c;
+
+ if (__clk_get_flags(clk) & CLK_IS_BASIC)
+ return -EINVAL;
+
+ c = to_clk_hw_omap(__clk_get_hw(clk));
+ if (c->ops && c->ops->allow_idle)
+ c->ops->allow_idle(c);
+ return 0;
+}
+
+/**
+ * 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;
+
+ for (i = 0; i < num_clocks; i++) {
+ init_clk = clk_get(NULL, clk_names[i]);
+ if (WARN(IS_ERR(init_clk), "could not find init clock %s\n",
+ clk_names[i]))
+ continue;
+ clk_prepare_enable(init_clk);
+ }
+}
+
+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
+ * @mpurate_ck_name: clk name of the clock to change rate
+ *
+ * Change the ARM MPU clock rate to the rate specified on the command
+ * line, if one was specified. @mpurate_ck_name should be
+ * "virt_prcm_set" on OMAP2xxx and "dpll1_ck" on OMAP34xx/OMAP36xx.
+ * XXX Does not handle voltage scaling - on OMAP2xxx this is currently
+ * handled by the virt_prcm_set clock, but this should be handled by
+ * the OPP layer. XXX This is intended to be handled by the OPP layer
+ * code in the near future and should be removed from the clock code.
+ * Returns -EINVAL if 'mpurate' is zero or if clk_set_rate() rejects
+ * the rate, -ENOENT if the struct clk referred to by @mpurate_ck_name
+ * cannot be found, or 0 upon success.
+ */
+int __init omap2_clk_switch_mpurate_at_boot(const char *mpurate_ck_name)
+{
+ struct clk *mpurate_ck;
+ int r;
+
+ if (!mpurate)
+ return -EINVAL;
+
+ mpurate_ck = clk_get(NULL, mpurate_ck_name);
+ if (WARN(IS_ERR(mpurate_ck), "Failed to get %s.\n", mpurate_ck_name))
+ return -ENOENT;
+
+ r = clk_set_rate(mpurate_ck, mpurate);
+ if (r < 0) {
+ WARN(1, "clock: %s: unable to set MPU rate to %d: %d\n",
+ mpurate_ck_name, mpurate, r);
+ clk_put(mpurate_ck);
+ return -EINVAL;
+ }
+
+ calibrate_delay();
+ clk_put(mpurate_ck);
+
+ return 0;
+}
+
+/**
+ * omap2_clk_print_new_rates - print summary of current clock tree rates
+ * @hfclkin_ck_name: clk name for the off-chip HF oscillator
+ * @core_ck_name: clk name for the on-chip CORE_CLK
+ * @mpu_ck_name: clk name for the ARM MPU clock
+ *
+ * Prints a short message to the console with the HFCLKIN oscillator
+ * rate, the rate of the CORE clock, and the rate of the ARM MPU clock.
+ * Called by the boot-time MPU rate switching code. XXX This is intended
+ * to be handled by the OPP layer code in the near future and should be
+ * removed from the clock code. No return value.
+ */
+void __init omap2_clk_print_new_rates(const char *hfclkin_ck_name,
+ const char *core_ck_name,
+ const char *mpu_ck_name)
+{
+ struct clk *hfclkin_ck, *core_ck, *mpu_ck;
+ unsigned long hfclkin_rate;
+
+ mpu_ck = clk_get(NULL, mpu_ck_name);
+ if (WARN(IS_ERR(mpu_ck), "clock: failed to get %s.\n", mpu_ck_name))
+ return;
+
+ core_ck = clk_get(NULL, core_ck_name);
+ if (WARN(IS_ERR(core_ck), "clock: failed to get %s.\n", core_ck_name))
+ return;
+
+ hfclkin_ck = clk_get(NULL, hfclkin_ck_name);
+ if (WARN(IS_ERR(hfclkin_ck), "Failed to get %s.\n", hfclkin_ck_name))
+ return;
+
+ hfclkin_rate = clk_get_rate(hfclkin_ck);
+
+ pr_info("Switched to new clocking rate (Crystal/Core/MPU): %ld.%01ld/%ld/%ld MHz\n",
+ (hfclkin_rate / 1000000), ((hfclkin_rate / 100000) % 10),
+ (clk_get_rate(core_ck) / 1000000),
+ (clk_get_rate(mpu_ck) / 1000000));
+}
+
+/**
+ * ti_clk_init_features - init clock features struct for the SoC
+ *
+ * Initializes the clock features struct based on the SoC type.
+ */
+void __init ti_clk_init_features(void)
+{
+ /* Fint setup for DPLLs */
+ if (cpu_is_omap3430()) {
+ ti_clk_features.fint_min = OMAP3430_DPLL_FINT_BAND1_MIN;
+ ti_clk_features.fint_max = OMAP3430_DPLL_FINT_BAND2_MAX;
+ ti_clk_features.fint_band1_max = OMAP3430_DPLL_FINT_BAND1_MAX;
+ ti_clk_features.fint_band2_min = OMAP3430_DPLL_FINT_BAND2_MIN;
+ } else {
+ ti_clk_features.fint_min = OMAP3PLUS_DPLL_FINT_MIN;
+ ti_clk_features.fint_max = OMAP3PLUS_DPLL_FINT_MAX;
+ }
+
+ /* Bypass value setup for DPLLs */
+ if (cpu_is_omap24xx()) {
+ ti_clk_features.dpll_bypass_vals |=
+ (1 << OMAP2XXX_EN_DPLL_LPBYPASS) |
+ (1 << OMAP2XXX_EN_DPLL_FRBYPASS);
+ } else if (cpu_is_omap34xx()) {
+ ti_clk_features.dpll_bypass_vals |=
+ (1 << OMAP3XXX_EN_DPLL_LPBYPASS) |
+ (1 << OMAP3XXX_EN_DPLL_FRBYPASS);
+ } else if (soc_is_am33xx() || cpu_is_omap44xx() || soc_is_am43xx() ||
+ soc_is_omap54xx() || soc_is_dra7xx()) {
+ ti_clk_features.dpll_bypass_vals |=
+ (1 << OMAP4XXX_EN_DPLL_LPBYPASS) |
+ (1 << OMAP4XXX_EN_DPLL_FRBYPASS) |
+ (1 << OMAP4XXX_EN_DPLL_MNBYPASS);
+ }
+
+ /* Jitter correction only available on OMAP343X */
+ if (cpu_is_omap343x())
+ ti_clk_features.flags |= TI_CLK_DPLL_HAS_FREQSEL;
+
+ /* Idlest value for interface clocks.
+ * 24xx uses 0 to indicate not ready, and 1 to indicate ready.
+ * 34xx reverses this, just to keep us on our toes
+ * AM35xx uses both, depending on the module.
+ */
+ if (cpu_is_omap24xx())
+ ti_clk_features.cm_idlest_val = OMAP24XX_CM_IDLEST_VAL;
+ else if (cpu_is_omap34xx())
+ ti_clk_features.cm_idlest_val = OMAP34XX_CM_IDLEST_VAL;
+
+ /* On OMAP3430 ES1.0, DPLL4 can't be re-programmed */
+ if (omap_rev() == OMAP3430_REV_ES1_0)
+ ti_clk_features.flags |= TI_CLK_DPLL4_DENY_REPROGRAM;
+}