arch/arm/plat-omap/include/plat/clock.h

   1 /*
   2  * OMAP clock: data structure definitions, function prototypes, shared macros
   3  *
   4  * Copyright (C) 2004-2005, 2008-2010 Nokia Corporation
   5  * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
   6  * Based on clocks.h by Tony Lindgren, Gordon McNutt and RidgeRun, Inc
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #ifndef __ARCH_ARM_OMAP_CLOCK_H
  14 #define __ARCH_ARM_OMAP_CLOCK_H
  15
  16 #include <linux/list.h>
  17
  18 struct module;
  19 struct clk;
  20 struct clockdomain;
  21
  22 /**
  23  * struct clkops - some clock function pointers
  24  * @enable: fn ptr that enables the current clock in hardware
  25  * @disable: fn ptr that enables the current clock in hardware
  26  * @find_idlest: function returning the IDLEST register for the clock's IP blk
  27  * @find_companion: function returning the "companion" clk reg for the clock
  28  * @allow_idle: fn ptr that enables autoidle for the current clock in hardware
  29  * @deny_idle: fn ptr that disables autoidle for the current clock in hardware
  30  *
  31  * A "companion" clk is an accompanying clock to the one being queried
  32  * that must be enabled for the IP module connected to the clock to
  33  * become accessible by the hardware.  Neither @find_idlest nor
  34  * @find_companion should be needed; that information is IP
  35  * block-specific; the hwmod code has been created to handle this, but
  36  * until hwmod data is ready and drivers have been converted to use PM
  37  * runtime calls in place of clk_enable()/clk_disable(), @find_idlest and
  38  * @find_companion must, unfortunately, remain.
  39  */
  40 struct clkops {
  41         int                     (*enable)(struct clk *);
  42         void                    (*disable)(struct clk *);
  43         void                    (*find_idlest)(struct clk *, void __iomem **,
  44                                                u8 *, u8 *);
  45         void                    (*find_companion)(struct clk *, void __iomem **,
  46                                                   u8 *);
  47         void                    (*allow_idle)(struct clk *);
  48         void                    (*deny_idle)(struct clk *);
  49 };
  50
  51 #ifdef CONFIG_ARCH_OMAP2PLUS
  52
  53 /* struct clksel_rate.flags possibilities */
  54 #define RATE_IN_242X            (1 << 0)
  55 #define RATE_IN_243X            (1 << 1)
  56 #define RATE_IN_3430ES1         (1 << 2)        /* 3430ES1 rates only */
  57 #define RATE_IN_3430ES2PLUS     (1 << 3)        /* 3430 ES >= 2 rates only */
  58 #define RATE_IN_36XX            (1 << 4)
  59 #define RATE_IN_4430            (1 << 5)
  60 #define RATE_IN_TI816X          (1 << 6)
  61 #define RATE_IN_4460            (1 << 7)
  62
  63 #define RATE_IN_24XX            (RATE_IN_242X | RATE_IN_243X)
  64 #define RATE_IN_34XX            (RATE_IN_3430ES1 | RATE_IN_3430ES2PLUS)
  65 #define RATE_IN_3XXX            (RATE_IN_34XX | RATE_IN_36XX)
  66 #define RATE_IN_44XX            (RATE_IN_4430 | RATE_IN_4460)
  67
  68 /* RATE_IN_3430ES2PLUS_36XX includes 34xx/35xx with ES >=2, and all 36xx/37xx */
  69 #define RATE_IN_3430ES2PLUS_36XX        (RATE_IN_3430ES2PLUS | RATE_IN_36XX)
  70
  71
  72 /**
  73  * struct clksel_rate - register bitfield values corresponding to clk divisors
  74  * @val: register bitfield value (shifted to bit 0)
  75  * @div: clock divisor corresponding to @val
  76  * @flags: (see "struct clksel_rate.flags possibilities" above)
  77  *
  78  * @val should match the value of a read from struct clk.clksel_reg
  79  * AND'ed with struct clk.clksel_mask, shifted right to bit 0.
  80  *
  81  * @div is the divisor that should be applied to the parent clock's rate
  82  * to produce the current clock's rate.
  83  *
  84  * XXX @flags probably should be replaced with an struct omap_chip.
  85  */
  86 struct clksel_rate {
  87         u32                     val;
  88         u8                      div;
  89         u8                      flags;
  90 };
  91
  92 /**
  93  * struct clksel - available parent clocks, and a pointer to their divisors
  94  * @parent: struct clk * to a possible parent clock
  95  * @rates: available divisors for this parent clock
  96  *
  97  * A struct clksel is always associated with one or more struct clks
  98  * and one or more struct clksel_rates.
  99  */
 100 struct clksel {
 101         struct clk               *parent;
 102         const struct clksel_rate *rates;
 103 };
 104
 105 /**
 106  * struct dpll_data - DPLL registers and integration data
 107  * @mult_div1_reg: register containing the DPLL M and N bitfields
 108  * @mult_mask: mask of the DPLL M bitfield in @mult_div1_reg
 109  * @div1_mask: mask of the DPLL N bitfield in @mult_div1_reg
 110  * @clk_bypass: struct clk pointer to the clock's bypass clock input
 111  * @clk_ref: struct clk pointer to the clock's reference clock input
 112  * @control_reg: register containing the DPLL mode bitfield
 113  * @enable_mask: mask of the DPLL mode bitfield in @control_reg
 114  * @last_rounded_rate: cache of the last rate result of omap2_dpll_round_rate()
 115  * @last_rounded_m: cache of the last M result of omap2_dpll_round_rate()
 116  * @max_multiplier: maximum valid non-bypass multiplier value (actual)
 117  * @last_rounded_n: cache of the last N result of omap2_dpll_round_rate()
 118  * @min_divider: minimum valid non-bypass divider value (actual)
 119  * @max_divider: maximum valid non-bypass divider value (actual)
 120  * @modes: possible values of @enable_mask
 121  * @autoidle_reg: register containing the DPLL autoidle mode bitfield
 122  * @idlest_reg: register containing the DPLL idle status bitfield
 123  * @autoidle_mask: mask of the DPLL autoidle mode bitfield in @autoidle_reg
 124  * @freqsel_mask: mask of the DPLL jitter correction bitfield in @control_reg
 125  * @idlest_mask: mask of the DPLL idle status bitfield in @idlest_reg
 126  * @auto_recal_bit: bitshift of the driftguard enable bit in @control_reg
 127  * @recal_en_bit: bitshift of the PRM_IRQENABLE_* bit for recalibration IRQs
 128  * @recal_st_bit: bitshift of the PRM_IRQSTATUS_* bit for recalibration IRQs
 129  * @flags: DPLL type/features (see below)
 130  *
 131  * Possible values for @flags:
 132  * DPLL_J_TYPE: "J-type DPLL" (only some 36xx, 4xxx DPLLs)
 133  *
 134  * @freqsel_mask is only used on the OMAP34xx family and AM35xx.
 135  *
 136  * XXX Some DPLLs have multiple bypass inputs, so it's not technically
 137  * correct to only have one @clk_bypass pointer.
 138  *
 139  * XXX The runtime-variable fields (@last_rounded_rate, @last_rounded_m,
 140  * @last_rounded_n) should be separated from the runtime-fixed fields
 141  * and placed into a different structure, so that the runtime-fixed data
 142  * can be placed into read-only space.
 143  */
 144 struct dpll_data {
 145         void __iomem            *mult_div1_reg;
 146         u32                     mult_mask;
 147         u32                     div1_mask;
 148         struct clk              *clk_bypass;
 149         struct clk              *clk_ref;
 150         void __iomem            *control_reg;
 151         u32                     enable_mask;
 152         unsigned long           last_rounded_rate;
 153         u16                     last_rounded_m;
 154         u16                     max_multiplier;
 155         u8                      last_rounded_n;
 156         u8                      min_divider;
 157         u16                     max_divider;
 158         u8                      modes;
 159 #if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
 160         void __iomem            *autoidle_reg;
 161         void __iomem            *idlest_reg;
 162         u32                     autoidle_mask;
 163         u32                     freqsel_mask;
 164         u32                     idlest_mask;
 165         u32                     dco_mask;
 166         u32                     sddiv_mask;
 167         u8                      auto_recal_bit;
 168         u8                      recal_en_bit;
 169         u8                      recal_st_bit;
 170         u8                      flags;
 171 #  endif
 172 };
 173
 174 #endif
 175
 176 /*
 177  * struct clk.flags possibilities
 178  *
 179  * XXX document the rest of the clock flags here
 180  *
 181  * CLOCK_CLKOUTX2: (OMAP4 only) DPLL CLKOUT and CLKOUTX2 GATE_CTRL
 182  *     bits share the same register.  This flag allows the
 183  *     omap4_dpllmx*() code to determine which GATE_CTRL bit field
 184  *     should be used.  This is a temporary solution - a better approach
 185  *     would be to associate clock type-specific data with the clock,
 186  *     similar to the struct dpll_data approach.
 187  */
 188 #define ENABLE_REG_32BIT        (1 << 0)        /* Use 32-bit access */
 189 #define CLOCK_IDLE_CONTROL      (1 << 1)
 190 #define CLOCK_NO_IDLE_PARENT    (1 << 2)
 191 #define ENABLE_ON_INIT          (1 << 3)        /* Enable upon framework init */
 192 #define INVERT_ENABLE           (1 << 4)        /* 0 enables, 1 disables */
 193 #define CLOCK_CLKOUTX2          (1 << 5)
 194
 195 /**
 196  * struct clk - OMAP struct clk
 197  * @node: list_head connecting this clock into the full clock list
 198  * @ops: struct clkops * for this clock
 199  * @name: the name of the clock in the hardware (used in hwmod data and debug)
 200  * @parent: pointer to this clock's parent struct clk
 201  * @children: list_head connecting to the child clks' @sibling list_heads
 202  * @sibling: list_head connecting this clk to its parent clk's @children
 203  * @rate: current clock rate
 204  * @enable_reg: register to write to enable the clock (see @enable_bit)
 205  * @recalc: fn ptr that returns the clock's current rate
 206  * @set_rate: fn ptr that can change the clock's current rate
 207  * @round_rate: fn ptr that can round the clock's current rate
 208  * @init: fn ptr to do clock-specific initialization
 209  * @enable_bit: bitshift to write to enable/disable the clock (see @enable_reg)
 210  * @usecount: number of users that have requested this clock to be enabled
 211  * @fixed_div: when > 0, this clock's rate is its parent's rate / @fixed_div
 212  * @flags: see "struct clk.flags possibilities" above
 213  * @clksel_reg: for clksel clks, register va containing src/divisor select
 214  * @clksel_mask: bitmask in @clksel_reg for the src/divisor selector
 215  * @clksel: for clksel clks, pointer to struct clksel for this clock
 216  * @dpll_data: for DPLLs, pointer to struct dpll_data for this clock
 217  * @clkdm_name: clockdomain name that this clock is contained in
 218  * @clkdm: pointer to struct clockdomain, resolved from @clkdm_name at runtime
 219  * @rate_offset: bitshift for rate selection bitfield (OMAP1 only)
 220  * @src_offset: bitshift for source selection bitfield (OMAP1 only)
 221  *
 222  * XXX @rate_offset, @src_offset should probably be removed and OMAP1
 223  * clock code converted to use clksel.
 224  *
 225  * XXX @usecount is poorly named.  It should be "enable_count" or
 226  * something similar.  "users" in the description refers to kernel
 227  * code (core code or drivers) that have called clk_enable() and not
 228  * yet called clk_disable(); the usecount of parent clocks is also
 229  * incremented by the clock code when clk_enable() is called on child
 230  * clocks and decremented by the clock code when clk_disable() is
 231  * called on child clocks.
 232  *
 233  * XXX @clkdm, @usecount, @children, @sibling should be marked for
 234  * internal use only.
 235  *
 236  * @children and @sibling are used to optimize parent-to-child clock
 237  * tree traversals.  (child-to-parent traversals use @parent.)
 238  *
 239  * XXX The notion of the clock's current rate probably needs to be
 240  * separated from the clock's target rate.
 241  */
 242 struct clk {
 243         struct list_head        node;
 244         const struct clkops     *ops;
 245         const char              *name;
 246         struct clk              *parent;
 247         struct list_head        children;
 248         struct list_head        sibling;        /* node for children */
 249         unsigned long           rate;
 250         void __iomem            *enable_reg;
 251         unsigned long           (*recalc)(struct clk *);
 252         int                     (*set_rate)(struct clk *, unsigned long);
 253         long                    (*round_rate)(struct clk *, unsigned long);
 254         void                    (*init)(struct clk *);
 255         u8                      enable_bit;
 256         s8                      usecount;
 257         u8                      fixed_div;
 258         u8                      flags;
 259 #ifdef CONFIG_ARCH_OMAP2PLUS
 260         void __iomem            *clksel_reg;
 261         u32                     clksel_mask;
 262         const struct clksel     *clksel;
 263         struct dpll_data        *dpll_data;
 264         const char              *clkdm_name;
 265         struct clockdomain      *clkdm;
 266 #else
 267         u8                      rate_offset;
 268         u8                      src_offset;
 269 #endif
 270 #if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
 271         struct dentry           *dent;  /* For visible tree hierarchy */
 272 #endif
 273 };
 274
 275 struct cpufreq_frequency_table;
 276
 277 struct clk_functions {
 278         int             (*clk_enable)(struct clk *clk);
 279         void            (*clk_disable)(struct clk *clk);
 280         long            (*clk_round_rate)(struct clk *clk, unsigned long rate);
 281         int             (*clk_set_rate)(struct clk *clk, unsigned long rate);
 282         int             (*clk_set_parent)(struct clk *clk, struct clk *parent);
 283         void            (*clk_allow_idle)(struct clk *clk);
 284         void            (*clk_deny_idle)(struct clk *clk);
 285         void            (*clk_disable_unused)(struct clk *clk);
 286 #ifdef CONFIG_CPU_FREQ
 287         void            (*clk_init_cpufreq_table)(struct cpufreq_frequency_table **);
 288         void            (*clk_exit_cpufreq_table)(struct cpufreq_frequency_table **);
 289 #endif
 290 };
 291
 292 extern int mpurate;
 293
 294 extern int clk_init(struct clk_functions *custom_clocks);
 295 extern void clk_preinit(struct clk *clk);
 296 extern int clk_register(struct clk *clk);
 297 extern void clk_reparent(struct clk *child, struct clk *parent);
 298 extern void clk_unregister(struct clk *clk);
 299 extern void propagate_rate(struct clk *clk);
 300 extern void recalculate_root_clocks(void);
 301 extern unsigned long followparent_recalc(struct clk *clk);
 302 extern void clk_enable_init_clocks(void);
 303 unsigned long omap_fixed_divisor_recalc(struct clk *clk);
 304 #ifdef CONFIG_CPU_FREQ
 305 extern void clk_init_cpufreq_table(struct cpufreq_frequency_table **table);
 306 extern void clk_exit_cpufreq_table(struct cpufreq_frequency_table **table);
 307 #endif
 308 extern struct clk *omap_clk_get_by_name(const char *name);
 309 extern int omap_clk_enable_autoidle_all(void);
 310 extern int omap_clk_disable_autoidle_all(void);
 311
 312 extern const struct clkops clkops_null;
 313
 314 extern struct clk dummy_ck;
 315
 316 #endif