294 lines
10 KiB
C
294 lines
10 KiB
C
/*
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* linux/arch/arm/mach-omap1/clock.h
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*
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* Copyright (C) 2004 - 2005, 2009 Nokia corporation
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* Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
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* Based on clocks.h by Tony Lindgren, Gordon McNutt and RidgeRun, Inc
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ARCH_ARM_MACH_OMAP1_CLOCK_H
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#define __ARCH_ARM_MACH_OMAP1_CLOCK_H
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#include <linux/clk.h>
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#include <linux/list.h>
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#include <linux/clkdev.h>
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struct module;
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struct clk;
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struct omap_clk {
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u16 cpu;
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struct clk_lookup lk;
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};
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#define CLK(dev, con, ck, cp) \
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{ \
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.cpu = cp, \
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.lk = { \
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.dev_id = dev, \
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.con_id = con, \
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.clk = ck, \
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}, \
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}
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/* Platform flags for the clkdev-OMAP integration code */
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#define CK_310 (1 << 0)
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#define CK_7XX (1 << 1) /* 7xx, 850 */
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#define CK_1510 (1 << 2)
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#define CK_16XX (1 << 3) /* 16xx, 17xx, 5912 */
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#define CK_1710 (1 << 4) /* 1710 extra for rate selection */
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/* Temporary, needed during the common clock framework conversion */
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#define __clk_get_name(clk) (clk->name)
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#define __clk_get_parent(clk) (clk->parent)
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#define __clk_get_rate(clk) (clk->rate)
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/**
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* struct clkops - some clock function pointers
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* @enable: fn ptr that enables the current clock in hardware
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* @disable: fn ptr that enables the current clock in hardware
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* @find_idlest: function returning the IDLEST register for the clock's IP blk
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* @find_companion: function returning the "companion" clk reg for the clock
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* @allow_idle: fn ptr that enables autoidle for the current clock in hardware
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* @deny_idle: fn ptr that disables autoidle for the current clock in hardware
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*
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* A "companion" clk is an accompanying clock to the one being queried
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* that must be enabled for the IP module connected to the clock to
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* become accessible by the hardware. Neither @find_idlest nor
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* @find_companion should be needed; that information is IP
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* block-specific; the hwmod code has been created to handle this, but
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* until hwmod data is ready and drivers have been converted to use PM
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* runtime calls in place of clk_enable()/clk_disable(), @find_idlest and
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* @find_companion must, unfortunately, remain.
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*/
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struct clkops {
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int (*enable)(struct clk *);
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void (*disable)(struct clk *);
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void (*find_idlest)(struct clk *, void __iomem **,
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u8 *, u8 *);
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void (*find_companion)(struct clk *, void __iomem **,
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u8 *);
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void (*allow_idle)(struct clk *);
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void (*deny_idle)(struct clk *);
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};
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/*
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* struct clk.flags possibilities
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*
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* XXX document the rest of the clock flags here
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*
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* CLOCK_CLKOUTX2: (OMAP4 only) DPLL CLKOUT and CLKOUTX2 GATE_CTRL
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* bits share the same register. This flag allows the
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* omap4_dpllmx*() code to determine which GATE_CTRL bit field
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* should be used. This is a temporary solution - a better approach
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* would be to associate clock type-specific data with the clock,
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* similar to the struct dpll_data approach.
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*/
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#define ENABLE_REG_32BIT (1 << 0) /* Use 32-bit access */
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#define CLOCK_IDLE_CONTROL (1 << 1)
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#define CLOCK_NO_IDLE_PARENT (1 << 2)
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#define ENABLE_ON_INIT (1 << 3) /* Enable upon framework init */
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#define INVERT_ENABLE (1 << 4) /* 0 enables, 1 disables */
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#define CLOCK_CLKOUTX2 (1 << 5)
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/**
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* struct clk - OMAP struct clk
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* @node: list_head connecting this clock into the full clock list
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* @ops: struct clkops * for this clock
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* @name: the name of the clock in the hardware (used in hwmod data and debug)
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* @parent: pointer to this clock's parent struct clk
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* @children: list_head connecting to the child clks' @sibling list_heads
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* @sibling: list_head connecting this clk to its parent clk's @children
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* @rate: current clock rate
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* @enable_reg: register to write to enable the clock (see @enable_bit)
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* @recalc: fn ptr that returns the clock's current rate
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* @set_rate: fn ptr that can change the clock's current rate
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* @round_rate: fn ptr that can round the clock's current rate
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* @init: fn ptr to do clock-specific initialization
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* @enable_bit: bitshift to write to enable/disable the clock (see @enable_reg)
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* @usecount: number of users that have requested this clock to be enabled
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* @fixed_div: when > 0, this clock's rate is its parent's rate / @fixed_div
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* @flags: see "struct clk.flags possibilities" above
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* @rate_offset: bitshift for rate selection bitfield (OMAP1 only)
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* @src_offset: bitshift for source selection bitfield (OMAP1 only)
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*
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* XXX @rate_offset, @src_offset should probably be removed and OMAP1
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* clock code converted to use clksel.
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*
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* XXX @usecount is poorly named. It should be "enable_count" or
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* something similar. "users" in the description refers to kernel
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* code (core code or drivers) that have called clk_enable() and not
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* yet called clk_disable(); the usecount of parent clocks is also
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* incremented by the clock code when clk_enable() is called on child
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* clocks and decremented by the clock code when clk_disable() is
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* called on child clocks.
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*
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* XXX @clkdm, @usecount, @children, @sibling should be marked for
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* internal use only.
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*
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* @children and @sibling are used to optimize parent-to-child clock
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* tree traversals. (child-to-parent traversals use @parent.)
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*
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* XXX The notion of the clock's current rate probably needs to be
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* separated from the clock's target rate.
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*/
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struct clk {
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struct list_head node;
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const struct clkops *ops;
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const char *name;
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struct clk *parent;
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struct list_head children;
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struct list_head sibling; /* node for children */
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unsigned long rate;
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void __iomem *enable_reg;
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unsigned long (*recalc)(struct clk *);
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int (*set_rate)(struct clk *, unsigned long);
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long (*round_rate)(struct clk *, unsigned long);
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void (*init)(struct clk *);
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u8 enable_bit;
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s8 usecount;
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u8 fixed_div;
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u8 flags;
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u8 rate_offset;
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u8 src_offset;
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#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
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struct dentry *dent; /* For visible tree hierarchy */
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#endif
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};
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struct clk_functions {
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int (*clk_enable)(struct clk *clk);
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void (*clk_disable)(struct clk *clk);
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long (*clk_round_rate)(struct clk *clk, unsigned long rate);
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int (*clk_set_rate)(struct clk *clk, unsigned long rate);
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int (*clk_set_parent)(struct clk *clk, struct clk *parent);
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void (*clk_allow_idle)(struct clk *clk);
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void (*clk_deny_idle)(struct clk *clk);
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void (*clk_disable_unused)(struct clk *clk);
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};
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extern int mpurate;
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extern int clk_init(struct clk_functions *custom_clocks);
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extern void clk_preinit(struct clk *clk);
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extern int clk_register(struct clk *clk);
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extern void clk_reparent(struct clk *child, struct clk *parent);
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extern void clk_unregister(struct clk *clk);
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extern void propagate_rate(struct clk *clk);
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extern void recalculate_root_clocks(void);
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extern unsigned long followparent_recalc(struct clk *clk);
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extern void clk_enable_init_clocks(void);
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unsigned long omap_fixed_divisor_recalc(struct clk *clk);
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extern struct clk *omap_clk_get_by_name(const char *name);
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extern int omap_clk_enable_autoidle_all(void);
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extern int omap_clk_disable_autoidle_all(void);
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extern const struct clkops clkops_null;
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extern struct clk dummy_ck;
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int omap1_clk_init(void);
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void omap1_clk_late_init(void);
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extern int omap1_clk_enable(struct clk *clk);
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extern void omap1_clk_disable(struct clk *clk);
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extern long omap1_clk_round_rate(struct clk *clk, unsigned long rate);
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extern int omap1_clk_set_rate(struct clk *clk, unsigned long rate);
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extern unsigned long omap1_ckctl_recalc(struct clk *clk);
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extern int omap1_set_sossi_rate(struct clk *clk, unsigned long rate);
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extern unsigned long omap1_sossi_recalc(struct clk *clk);
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extern unsigned long omap1_ckctl_recalc_dsp_domain(struct clk *clk);
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extern int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate);
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extern int omap1_set_uart_rate(struct clk *clk, unsigned long rate);
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extern unsigned long omap1_uart_recalc(struct clk *clk);
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extern int omap1_set_ext_clk_rate(struct clk *clk, unsigned long rate);
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extern long omap1_round_ext_clk_rate(struct clk *clk, unsigned long rate);
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extern void omap1_init_ext_clk(struct clk *clk);
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extern int omap1_select_table_rate(struct clk *clk, unsigned long rate);
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extern long omap1_round_to_table_rate(struct clk *clk, unsigned long rate);
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extern int omap1_clk_set_rate_ckctl_arm(struct clk *clk, unsigned long rate);
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extern long omap1_clk_round_rate_ckctl_arm(struct clk *clk, unsigned long rate);
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extern unsigned long omap1_watchdog_recalc(struct clk *clk);
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#ifdef CONFIG_OMAP_RESET_CLOCKS
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extern void omap1_clk_disable_unused(struct clk *clk);
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#else
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#define omap1_clk_disable_unused NULL
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#endif
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struct uart_clk {
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struct clk clk;
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unsigned long sysc_addr;
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};
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/* Provide a method for preventing idling some ARM IDLECT clocks */
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struct arm_idlect1_clk {
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struct clk clk;
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unsigned long no_idle_count;
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__u8 idlect_shift;
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};
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/* ARM_CKCTL bit shifts */
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#define CKCTL_PERDIV_OFFSET 0
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#define CKCTL_LCDDIV_OFFSET 2
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#define CKCTL_ARMDIV_OFFSET 4
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#define CKCTL_DSPDIV_OFFSET 6
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#define CKCTL_TCDIV_OFFSET 8
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#define CKCTL_DSPMMUDIV_OFFSET 10
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/*#define ARM_TIMXO 12*/
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#define EN_DSPCK 13
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/*#define ARM_INTHCK_SEL 14*/ /* Divide-by-2 for mpu inth_ck */
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/* DSP_CKCTL bit shifts */
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#define CKCTL_DSPPERDIV_OFFSET 0
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/* ARM_IDLECT2 bit shifts */
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#define EN_WDTCK 0
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#define EN_XORPCK 1
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#define EN_PERCK 2
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#define EN_LCDCK 3
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#define EN_LBCK 4 /* Not on 1610/1710 */
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/*#define EN_HSABCK 5*/
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#define EN_APICK 6
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#define EN_TIMCK 7
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#define DMACK_REQ 8
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#define EN_GPIOCK 9 /* Not on 1610/1710 */
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/*#define EN_LBFREECK 10*/
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#define EN_CKOUT_ARM 11
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/* ARM_IDLECT3 bit shifts */
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#define EN_OCPI_CK 0
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#define EN_TC1_CK 2
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#define EN_TC2_CK 4
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/* DSP_IDLECT2 bit shifts (0,1,2 are same as for ARM_IDLECT2) */
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#define EN_DSPTIMCK 5
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/* Various register defines for clock controls scattered around OMAP chip */
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#define SDW_MCLK_INV_BIT 2 /* In ULPD_CLKC_CTRL */
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#define USB_MCLK_EN_BIT 4 /* In ULPD_CLKC_CTRL */
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#define USB_HOST_HHC_UHOST_EN 9 /* In MOD_CONF_CTRL_0 */
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#define SWD_ULPD_PLL_CLK_REQ 1 /* In SWD_CLK_DIV_CTRL_SEL */
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#define COM_ULPD_PLL_CLK_REQ 1 /* In COM_CLK_DIV_CTRL_SEL */
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#define SWD_CLK_DIV_CTRL_SEL 0xfffe0874
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#define COM_CLK_DIV_CTRL_SEL 0xfffe0878
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#define SOFT_REQ_REG 0xfffe0834
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#define SOFT_REQ_REG2 0xfffe0880
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extern __u32 arm_idlect1_mask;
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extern struct clk *api_ck_p, *ck_dpll1_p, *ck_ref_p;
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extern const struct clkops clkops_dspck;
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extern const struct clkops clkops_dummy;
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extern const struct clkops clkops_uart_16xx;
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extern const struct clkops clkops_generic;
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/* used for passing SoC type to omap1_{select,round_to}_table_rate() */
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extern u32 cpu_mask;
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#endif
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