arch/arm/mach-omap1/clock.h

   1 /*
   2  *  linux/arch/arm/mach-omap1/clock.h
   3  *
   4  *  Copyright (C) 2004 - 2005, 2009 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_MACH_OMAP1_CLOCK_H
  14 #define __ARCH_ARM_MACH_OMAP1_CLOCK_H
  15
  16 #include <linux/clk.h>
  17 #include <linux/list.h>
  18
  19 #include <linux/clkdev.h>
  20
  21 struct module;
  22 struct clk;
  23
  24 struct omap_clk {
  25         u16                             cpu;
  26         struct clk_lookup               lk;
  27 };
  28
  29 #define CLK(dev, con, ck, cp)           \
  30         {                               \
  31                  .cpu = cp,             \
  32                 .lk = {                 \
  33                         .dev_id = dev,  \
  34                         .con_id = con,  \
  35                         .clk = ck,      \
  36                 },                      \
  37         }
  38
  39 /* Platform flags for the clkdev-OMAP integration code */
  40 #define CK_310          (1 << 0)
  41 #define CK_7XX          (1 << 1)        /* 7xx, 850 */
  42 #define CK_1510         (1 << 2)
  43 #define CK_16XX         (1 << 3)        /* 16xx, 17xx, 5912 */
  44 #define CK_1710         (1 << 4)        /* 1710 extra for rate selection */
  45
  46
  47 /* Temporary, needed during the common clock framework conversion */
  48 #define __clk_get_name(clk)     (clk->name)
  49 #define __clk_get_parent(clk)   (clk->parent)
  50 #define __clk_get_rate(clk)     (clk->rate)
  51
  52 /**
  53  * struct clkops - some clock function pointers
  54  * @enable: fn ptr that enables the current clock in hardware
  55  * @disable: fn ptr that enables the current clock in hardware
  56  * @find_idlest: function returning the IDLEST register for the clock's IP blk
  57  * @find_companion: function returning the "companion" clk reg for the clock
  58  * @allow_idle: fn ptr that enables autoidle for the current clock in hardware
  59  * @deny_idle: fn ptr that disables autoidle for the current clock in hardware
  60  *
  61  * A "companion" clk is an accompanying clock to the one being queried
  62  * that must be enabled for the IP module connected to the clock to
  63  * become accessible by the hardware.  Neither @find_idlest nor
  64  * @find_companion should be needed; that information is IP
  65  * block-specific; the hwmod code has been created to handle this, but
  66  * until hwmod data is ready and drivers have been converted to use PM
  67  * runtime calls in place of clk_enable()/clk_disable(), @find_idlest and
  68  * @find_companion must, unfortunately, remain.
  69  */
  70 struct clkops {
  71         int                     (*enable)(struct clk *);
  72         void                    (*disable)(struct clk *);
  73         void                    (*find_idlest)(struct clk *, void __iomem **,
  74                                                u8 *, u8 *);
  75         void                    (*find_companion)(struct clk *, void __iomem **,
  76                                                   u8 *);
  77         void                    (*allow_idle)(struct clk *);
  78         void                    (*deny_idle)(struct clk *);
  79 };
  80
  81 /*
  82  * struct clk.flags possibilities
  83  *
  84  * XXX document the rest of the clock flags here
  85  *
  86  * CLOCK_CLKOUTX2: (OMAP4 only) DPLL CLKOUT and CLKOUTX2 GATE_CTRL
  87  *     bits share the same register.  This flag allows the
  88  *     omap4_dpllmx*() code to determine which GATE_CTRL bit field
  89  *     should be used.  This is a temporary solution - a better approach
  90  *     would be to associate clock type-specific data with the clock,
  91  *     similar to the struct dpll_data approach.
  92  */
  93 #define ENABLE_REG_32BIT        (1 << 0)        /* Use 32-bit access */
  94 #define CLOCK_IDLE_CONTROL      (1 << 1)
  95 #define CLOCK_NO_IDLE_PARENT    (1 << 2)
  96 #define ENABLE_ON_INIT          (1 << 3)        /* Enable upon framework init */
  97 #define INVERT_ENABLE           (1 << 4)        /* 0 enables, 1 disables */
  98 #define CLOCK_CLKOUTX2          (1 << 5)
  99
 100 /**
 101  * struct clk - OMAP struct clk
 102  * @node: list_head connecting this clock into the full clock list
 103  * @ops: struct clkops * for this clock
 104  * @name: the name of the clock in the hardware (used in hwmod data and debug)
 105  * @parent: pointer to this clock's parent struct clk
 106  * @children: list_head connecting to the child clks' @sibling list_heads
 107  * @sibling: list_head connecting this clk to its parent clk's @children
 108  * @rate: current clock rate
 109  * @enable_reg: register to write to enable the clock (see @enable_bit)
 110  * @recalc: fn ptr that returns the clock's current rate
 111  * @set_rate: fn ptr that can change the clock's current rate
 112  * @round_rate: fn ptr that can round the clock's current rate
 113  * @init: fn ptr to do clock-specific initialization
 114  * @enable_bit: bitshift to write to enable/disable the clock (see @enable_reg)
 115  * @usecount: number of users that have requested this clock to be enabled
 116  * @fixed_div: when > 0, this clock's rate is its parent's rate / @fixed_div
 117  * @flags: see "struct clk.flags possibilities" above
 118  * @rate_offset: bitshift for rate selection bitfield (OMAP1 only)
 119  * @src_offset: bitshift for source selection bitfield (OMAP1 only)
 120  *
 121  * XXX @rate_offset, @src_offset should probably be removed and OMAP1
 122  * clock code converted to use clksel.
 123  *
 124  * XXX @usecount is poorly named.  It should be "enable_count" or
 125  * something similar.  "users" in the description refers to kernel
 126  * code (core code or drivers) that have called clk_enable() and not
 127  * yet called clk_disable(); the usecount of parent clocks is also
 128  * incremented by the clock code when clk_enable() is called on child
 129  * clocks and decremented by the clock code when clk_disable() is
 130  * called on child clocks.
 131  *
 132  * XXX @clkdm, @usecount, @children, @sibling should be marked for
 133  * internal use only.
 134  *
 135  * @children and @sibling are used to optimize parent-to-child clock
 136  * tree traversals.  (child-to-parent traversals use @parent.)
 137  *
 138  * XXX The notion of the clock's current rate probably needs to be
 139  * separated from the clock's target rate.
 140  */
 141 struct clk {
 142         struct list_head        node;
 143         const struct clkops     *ops;
 144         const char              *name;
 145         struct clk              *parent;
 146         struct list_head        children;
 147         struct list_head        sibling;        /* node for children */
 148         unsigned long           rate;
 149         void __iomem            *enable_reg;
 150         unsigned long           (*recalc)(struct clk *);
 151         int                     (*set_rate)(struct clk *, unsigned long);
 152         long                    (*round_rate)(struct clk *, unsigned long);
 153         void                    (*init)(struct clk *);
 154         u8                      enable_bit;
 155         s8                      usecount;
 156         u8                      fixed_div;
 157         u8                      flags;
 158         u8                      rate_offset;
 159         u8                      src_offset;
 160 #if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
 161         struct dentry           *dent;  /* For visible tree hierarchy */
 162 #endif
 163 };
 164
 165 struct clk_functions {
 166         int             (*clk_enable)(struct clk *clk);
 167         void            (*clk_disable)(struct clk *clk);
 168         long            (*clk_round_rate)(struct clk *clk, unsigned long rate);
 169         int             (*clk_set_rate)(struct clk *clk, unsigned long rate);
 170         int             (*clk_set_parent)(struct clk *clk, struct clk *parent);
 171         void            (*clk_allow_idle)(struct clk *clk);
 172         void            (*clk_deny_idle)(struct clk *clk);
 173         void            (*clk_disable_unused)(struct clk *clk);
 174 };
 175
 176 extern int clk_init(struct clk_functions *custom_clocks);
 177 extern void clk_preinit(struct clk *clk);
 178 extern int clk_register(struct clk *clk);
 179 extern void clk_reparent(struct clk *child, struct clk *parent);
 180 extern void clk_unregister(struct clk *clk);
 181 extern void propagate_rate(struct clk *clk);
 182 extern void recalculate_root_clocks(void);
 183 extern unsigned long followparent_recalc(struct clk *clk);
 184 extern void clk_enable_init_clocks(void);
 185 unsigned long omap_fixed_divisor_recalc(struct clk *clk);
 186 extern struct clk *omap_clk_get_by_name(const char *name);
 187 extern int omap_clk_enable_autoidle_all(void);
 188 extern int omap_clk_disable_autoidle_all(void);
 189
 190 extern const struct clkops clkops_null;
 191
 192 extern struct clk dummy_ck;
 193
 194 int omap1_clk_init(void);
 195 void omap1_clk_late_init(void);
 196 extern int omap1_clk_enable(struct clk *clk);
 197 extern void omap1_clk_disable(struct clk *clk);
 198 extern long omap1_clk_round_rate(struct clk *clk, unsigned long rate);
 199 extern int omap1_clk_set_rate(struct clk *clk, unsigned long rate);
 200 extern unsigned long omap1_ckctl_recalc(struct clk *clk);
 201 extern int omap1_set_sossi_rate(struct clk *clk, unsigned long rate);
 202 extern unsigned long omap1_sossi_recalc(struct clk *clk);
 203 extern unsigned long omap1_ckctl_recalc_dsp_domain(struct clk *clk);
 204 extern int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate);
 205 extern int omap1_set_uart_rate(struct clk *clk, unsigned long rate);
 206 extern unsigned long omap1_uart_recalc(struct clk *clk);
 207 extern int omap1_set_ext_clk_rate(struct clk *clk, unsigned long rate);
 208 extern long omap1_round_ext_clk_rate(struct clk *clk, unsigned long rate);
 209 extern void omap1_init_ext_clk(struct clk *clk);
 210 extern int omap1_select_table_rate(struct clk *clk, unsigned long rate);
 211 extern long omap1_round_to_table_rate(struct clk *clk, unsigned long rate);
 212 extern int omap1_clk_set_rate_ckctl_arm(struct clk *clk, unsigned long rate);
 213 extern long omap1_clk_round_rate_ckctl_arm(struct clk *clk, unsigned long rate);
 214 extern unsigned long omap1_watchdog_recalc(struct clk *clk);
 215
 216 #ifdef CONFIG_OMAP_RESET_CLOCKS
 217 extern void omap1_clk_disable_unused(struct clk *clk);
 218 #else
 219 #define omap1_clk_disable_unused        NULL
 220 #endif
 221
 222 struct uart_clk {
 223         struct clk      clk;
 224         unsigned long   sysc_addr;
 225 };
 226
 227 /* Provide a method for preventing idling some ARM IDLECT clocks */
 228 struct arm_idlect1_clk {
 229         struct clk      clk;
 230         unsigned long   no_idle_count;
 231         __u8            idlect_shift;
 232 };
 233
 234 /* ARM_CKCTL bit shifts */
 235 #define CKCTL_PERDIV_OFFSET     0
 236 #define CKCTL_LCDDIV_OFFSET     2
 237 #define CKCTL_ARMDIV_OFFSET     4
 238 #define CKCTL_DSPDIV_OFFSET     6
 239 #define CKCTL_TCDIV_OFFSET      8
 240 #define CKCTL_DSPMMUDIV_OFFSET  10
 241 /*#define ARM_TIMXO             12*/
 242 #define EN_DSPCK                13
 243 /*#define ARM_INTHCK_SEL        14*/ /* Divide-by-2 for mpu inth_ck */
 244 /* DSP_CKCTL bit shifts */
 245 #define CKCTL_DSPPERDIV_OFFSET  0
 246
 247 /* ARM_IDLECT2 bit shifts */
 248 #define EN_WDTCK        0
 249 #define EN_XORPCK       1
 250 #define EN_PERCK        2
 251 #define EN_LCDCK        3
 252 #define EN_LBCK         4 /* Not on 1610/1710 */
 253 /*#define EN_HSABCK     5*/
 254 #define EN_APICK        6
 255 #define EN_TIMCK        7
 256 #define DMACK_REQ       8
 257 #define EN_GPIOCK       9 /* Not on 1610/1710 */
 258 /*#define EN_LBFREECK   10*/
 259 #define EN_CKOUT_ARM    11
 260
 261 /* ARM_IDLECT3 bit shifts */
 262 #define EN_OCPI_CK      0
 263 #define EN_TC1_CK       2
 264 #define EN_TC2_CK       4
 265
 266 /* DSP_IDLECT2 bit shifts (0,1,2 are same as for ARM_IDLECT2) */
 267 #define EN_DSPTIMCK     5
 268
 269 /* Various register defines for clock controls scattered around OMAP chip */
 270 #define SDW_MCLK_INV_BIT        2       /* In ULPD_CLKC_CTRL */
 271 #define USB_MCLK_EN_BIT         4       /* In ULPD_CLKC_CTRL */
 272 #define USB_HOST_HHC_UHOST_EN   9       /* In MOD_CONF_CTRL_0 */
 273 #define SWD_ULPD_PLL_CLK_REQ    1       /* In SWD_CLK_DIV_CTRL_SEL */
 274 #define COM_ULPD_PLL_CLK_REQ    1       /* In COM_CLK_DIV_CTRL_SEL */
 275 #define SWD_CLK_DIV_CTRL_SEL    0xfffe0874
 276 #define COM_CLK_DIV_CTRL_SEL    0xfffe0878
 277 #define SOFT_REQ_REG            0xfffe0834
 278 #define SOFT_REQ_REG2           0xfffe0880
 279
 280 extern __u32 arm_idlect1_mask;
 281 extern struct clk *api_ck_p, *ck_dpll1_p, *ck_ref_p;
 282
 283 extern const struct clkops clkops_dspck;
 284 extern const struct clkops clkops_dummy;
 285 extern const struct clkops clkops_uart_16xx;
 286 extern const struct clkops clkops_generic;
 287
 288 /* used for passing SoC type to omap1_{select,round_to}_table_rate() */
 289 extern u32 cpu_mask;
 290
 291 #endif