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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2013 Broadcom Corporation.
*/
#include <linux/stddef.h>
#ifdef CONFIG_CLK_DEBUG
#undef writel
#undef readl
static inline void writel(u32 val, void *addr)
{
printf("Write [0x%p] = 0x%08x\n", addr, val);
*(u32 *)addr = val;
}
static inline u32 readl(void *addr)
{
u32 val = *(u32 *)addr;
printf("Read [0x%p] = 0x%08x\n", addr, val);
return val;
}
#endif
struct clk;
struct clk_lookup {
const char *dev_id;
const char *con_id;
struct clk *clk;
};
extern struct clk_lookup arch_clk_tbl[];
extern unsigned int arch_clk_tbl_array_size;
/**
* struct clk_ops - standard clock operations
* @enable: enable/disable clock, see clk_enable() and clk_disable()
* @set_rate: set the clock rate, see clk_set_rate().
* @get_rate: get the clock rate, see clk_get_rate().
* @round_rate: round a given clock rate, see clk_round_rate().
* @set_parent: set the clock's parent, see clk_set_parent().
*
* Group the common clock implementations together so that we
* don't have to keep setting the same fiels again. We leave
* enable in struct clk.
*
*/
struct clk_ops {
int (*enable) (struct clk *c, int enable);
int (*set_rate) (struct clk *c, unsigned long rate);
unsigned long (*get_rate) (struct clk *c);
unsigned long (*round_rate) (struct clk *c, unsigned long rate);
int (*set_parent) (struct clk *c, struct clk *parent);
};
struct clk {
struct clk *parent;
const char *name;
int use_cnt;
unsigned long rate; /* in HZ */
/* programmable divider. 0 means fixed ratio to parent clock */
unsigned long div;
struct clk_src *src;
struct clk_ops *ops;
unsigned long ccu_clk_mgr_base;
int sel;
};
struct refclk *refclk_str_to_clk(const char *name);
/* The common clock framework uses u8 to represent a parent index */
#define PARENT_COUNT_MAX ((u32)U8_MAX)
#define BAD_CLK_INDEX U8_MAX /* Can't ever be valid */
#define BAD_CLK_NAME ((const char *)-1)
#define BAD_SCALED_DIV_VALUE U64_MAX
/*
* Utility macros for object flag management. If possible, flags
* should be defined such that 0 is the desired default value.
*/
#define FLAG(type, flag) BCM_CLK_ ## type ## _FLAGS_ ## flag
#define FLAG_SET(obj, type, flag) ((obj)->flags |= FLAG(type, flag))
#define FLAG_CLEAR(obj, type, flag) ((obj)->flags &= ~(FLAG(type, flag)))
#define FLAG_FLIP(obj, type, flag) ((obj)->flags ^= FLAG(type, flag))
#define FLAG_TEST(obj, type, flag) (!!((obj)->flags & FLAG(type, flag)))
/* Clock field state tests */
#define gate_exists(gate) FLAG_TEST(gate, GATE, EXISTS)
#define gate_is_enabled(gate) FLAG_TEST(gate, GATE, ENABLED)
#define gate_is_hw_controllable(gate) FLAG_TEST(gate, GATE, HW)
#define gate_is_sw_controllable(gate) FLAG_TEST(gate, GATE, SW)
#define gate_is_sw_managed(gate) FLAG_TEST(gate, GATE, SW_MANAGED)
#define gate_is_no_disable(gate) FLAG_TEST(gate, GATE, NO_DISABLE)
#define gate_flip_enabled(gate) FLAG_FLIP(gate, GATE, ENABLED)
#define divider_exists(div) FLAG_TEST(div, DIV, EXISTS)
#define divider_is_fixed(div) FLAG_TEST(div, DIV, FIXED)
#define divider_has_fraction(div) (!divider_is_fixed(div) && \
(div)->frac_width > 0)
#define selector_exists(sel) ((sel)->width != 0)
#define trigger_exists(trig) FLAG_TEST(trig, TRIG, EXISTS)
/* Clock type, used to tell common block what it's part of */
enum bcm_clk_type {
bcm_clk_none, /* undefined clock type */
bcm_clk_bus,
bcm_clk_core,
bcm_clk_peri
};
/*
* Gating control and status is managed by a 32-bit gate register.
*
* There are several types of gating available:
* - (no gate)
* A clock with no gate is assumed to be always enabled.
* - hardware-only gating (auto-gating)
* Enabling or disabling clocks with this type of gate is
* managed automatically by the hardware. Such clocks can be
* considered by the software to be enabled. The current status
* of auto-gated clocks can be read from the gate status bit.
* - software-only gating
* Auto-gating is not available for this type of clock.
* Instead, software manages whether it's enabled by setting or
* clearing the enable bit. The current gate status of a gate
* under software control can be read from the gate status bit.
* To ensure a change to the gating status is complete, the
* status bit can be polled to verify that the gate has entered
* the desired state.
* - selectable hardware or software gating
* Gating for this type of clock can be configured to be either
* under software or hardware control. Which type is in use is
* determined by the hw_sw_sel bit of the gate register.
*/
struct bcm_clk_gate {
u32 offset; /* gate register offset */
u32 status_bit; /* 0: gate is disabled; 0: gatge is enabled */
u32 en_bit; /* 0: disable; 1: enable */
u32 hw_sw_sel_bit; /* 0: hardware gating; 1: software gating */
u32 flags; /* BCM_CLK_GATE_FLAGS_* below */
};
/*
* Gate flags:
* HW means this gate can be auto-gated
* SW means the state of this gate can be software controlled
* NO_DISABLE means this gate is (only) enabled if under software control
* SW_MANAGED means the status of this gate is under software control
* ENABLED means this software-managed gate is *supposed* to be enabled
*/
#define BCM_CLK_GATE_FLAGS_EXISTS ((u32)1 << 0) /* Gate is valid */
#define BCM_CLK_GATE_FLAGS_HW ((u32)1 << 1) /* Can auto-gate */
#define BCM_CLK_GATE_FLAGS_SW ((u32)1 << 2) /* Software control */
#define BCM_CLK_GATE_FLAGS_NO_DISABLE ((u32)1 << 3) /* HW or enabled */
#define BCM_CLK_GATE_FLAGS_SW_MANAGED ((u32)1 << 4) /* SW now in control */
#define BCM_CLK_GATE_FLAGS_ENABLED ((u32)1 << 5) /* If SW_MANAGED */
/*
* Gate initialization macros.
*
* Any gate initially under software control will be enabled.
*/
/* A hardware/software gate initially under software control */
#define HW_SW_GATE(_offset, _status_bit, _en_bit, _hw_sw_sel_bit) \
{ \
.offset = (_offset), \
.status_bit = (_status_bit), \
.en_bit = (_en_bit), \
.hw_sw_sel_bit = (_hw_sw_sel_bit), \
.flags = FLAG(GATE, HW)|FLAG(GATE, SW)| \
FLAG(GATE, SW_MANAGED)|FLAG(GATE, ENABLED)| \
FLAG(GATE, EXISTS), \
}
/* A hardware/software gate initially under hardware control */
#define HW_SW_GATE_AUTO(_offset, _status_bit, _en_bit, _hw_sw_sel_bit) \
{ \
.offset = (_offset), \
.status_bit = (_status_bit), \
.en_bit = (_en_bit), \
.hw_sw_sel_bit = (_hw_sw_sel_bit), \
.flags = FLAG(GATE, HW)|FLAG(GATE, SW)| \
FLAG(GATE, EXISTS), \
}
/* A hardware-or-enabled gate (enabled if not under hardware control) */
#define HW_ENABLE_GATE(_offset, _status_bit, _en_bit, _hw_sw_sel_bit) \
{ \
.offset = (_offset), \
.status_bit = (_status_bit), \
.en_bit = (_en_bit), \
.hw_sw_sel_bit = (_hw_sw_sel_bit), \
.flags = FLAG(GATE, HW)|FLAG(GATE, SW)| \
FLAG(GATE, NO_DISABLE)|FLAG(GATE, EXISTS), \
}
/* A software-only gate */
#define SW_ONLY_GATE(_offset, _status_bit, _en_bit) \
{ \
.offset = (_offset), \
.status_bit = (_status_bit), \
.en_bit = (_en_bit), \
.flags = FLAG(GATE, SW)|FLAG(GATE, SW_MANAGED)| \
FLAG(GATE, ENABLED)|FLAG(GATE, EXISTS), \
}
/* A hardware-only gate */
#define HW_ONLY_GATE(_offset, _status_bit) \
{ \
.offset = (_offset), \
.status_bit = (_status_bit), \
.flags = FLAG(GATE, HW)|FLAG(GATE, EXISTS), \
}
/*
* Each clock can have zero, one, or two dividers which change the
* output rate of the clock. Each divider can be either fixed or
* variable. If there are two dividers, they are the "pre-divider"
* and the "regular" or "downstream" divider. If there is only one,
* there is no pre-divider.
*
* A fixed divider is any non-zero (positive) value, and it
* indicates how the input rate is affected by the divider.
*
* The value of a variable divider is maintained in a sub-field of a
* 32-bit divider register. The position of the field in the
* register is defined by its offset and width. The value recorded
* in this field is always 1 less than the value it represents.
*
* In addition, a variable divider can indicate that some subset
* of its bits represent a "fractional" part of the divider. Such
* bits comprise the low-order portion of the divider field, and can
* be viewed as representing the portion of the divider that lies to
* the right of the decimal point. Most variable dividers have zero
* fractional bits. Variable dividers with non-zero fraction width
* still record a value 1 less than the value they represent; the
* added 1 does *not* affect the low-order bit in this case, it
* affects the bits above the fractional part only. (Often in this
* code a divider field value is distinguished from the value it
* represents by referring to the latter as a "divisor".)
*
* In order to avoid dealing with fractions, divider arithmetic is
* performed using "scaled" values. A scaled value is one that's
* been left-shifted by the fractional width of a divider. Dividing
* a scaled value by a scaled divisor produces the desired quotient
* without loss of precision and without any other special handling
* for fractions.
*
* The recorded value of a variable divider can be modified. To
* modify either divider (or both), a clock must be enabled (i.e.,
* using its gate). In addition, a trigger register (described
* below) must be used to commit the change, and polled to verify
* the change is complete.
*/
struct bcm_clk_div {
union {
struct { /* variable divider */
u32 offset; /* divider register offset */
u32 shift; /* field shift */
u32 width; /* field width */
u32 frac_width; /* field fraction width */
u64 scaled_div; /* scaled divider value */
};
u32 fixed; /* non-zero fixed divider value */
};
u32 flags; /* BCM_CLK_DIV_FLAGS_* below */
};
/*
* Divider flags:
* EXISTS means this divider exists
* FIXED means it is a fixed-rate divider
*/
#define BCM_CLK_DIV_FLAGS_EXISTS ((u32)1 << 0) /* Divider is valid */
#define BCM_CLK_DIV_FLAGS_FIXED ((u32)1 << 1) /* Fixed-value */
/* Divider initialization macros */
/* A fixed (non-zero) divider */
#define FIXED_DIVIDER(_value) \
{ \
.fixed = (_value), \
.flags = FLAG(DIV, EXISTS)|FLAG(DIV, FIXED), \
}
/* A divider with an integral divisor */
#define DIVIDER(_offset, _shift, _width) \
{ \
.offset = (_offset), \
.shift = (_shift), \
.width = (_width), \
.scaled_div = BAD_SCALED_DIV_VALUE, \
.flags = FLAG(DIV, EXISTS), \
}
/* A divider whose divisor has an integer and fractional part */
#define FRAC_DIVIDER(_offset, _shift, _width, _frac_width) \
{ \
.offset = (_offset), \
.shift = (_shift), \
.width = (_width), \
.frac_width = (_frac_width), \
.scaled_div = BAD_SCALED_DIV_VALUE, \
.flags = FLAG(DIV, EXISTS), \
}
/*
* Clocks may have multiple "parent" clocks. If there is more than
* one, a selector must be specified to define which of the parent
* clocks is currently in use. The selected clock is indicated in a
* sub-field of a 32-bit selector register. The range of
* representable selector values typically exceeds the number of
* available parent clocks. Occasionally the reset value of a
* selector field is explicitly set to a (specific) value that does
* not correspond to a defined input clock.
*
* We register all known parent clocks with the common clock code
* using a packed array (i.e., no empty slots) of (parent) clock
* names, and refer to them later using indexes into that array.
* We maintain an array of selector values indexed by common clock
* index values in order to map between these common clock indexes
* and the selector values used by the hardware.
*
* Like dividers, a selector can be modified, but to do so a clock
* must be enabled, and a trigger must be used to commit the change.
*/
struct bcm_clk_sel {
u32 offset; /* selector register offset */
u32 shift; /* field shift */
u32 width; /* field width */
u32 parent_count; /* number of entries in parent_sel[] */
u32 *parent_sel; /* array of parent selector values */
u8 clk_index; /* current selected index in parent_sel[] */
};
/* Selector initialization macro */
#define SELECTOR(_offset, _shift, _width) \
{ \
.offset = (_offset), \
.shift = (_shift), \
.width = (_width), \
.clk_index = BAD_CLK_INDEX, \
}
/*
* Making changes to a variable divider or a selector for a clock
* requires the use of a trigger. A trigger is defined by a single
* bit within a register. To signal a change, a 1 is written into
* that bit. To determine when the change has been completed, that
* trigger bit is polled; the read value will be 1 while the change
* is in progress, and 0 when it is complete.
*
* Occasionally a clock will have more than one trigger. In this
* case, the "pre-trigger" will be used when changing a clock's
* selector and/or its pre-divider.
*/
struct bcm_clk_trig {
u32 offset; /* trigger register offset */
u32 bit; /* trigger bit */
u32 flags; /* BCM_CLK_TRIG_FLAGS_* below */
};
/*
* Trigger flags:
* EXISTS means this trigger exists
*/
#define BCM_CLK_TRIG_FLAGS_EXISTS ((u32)1 << 0) /* Trigger is valid */
/* Trigger initialization macro */
#define TRIGGER(_offset, _bit) \
{ \
.offset = (_offset), \
.bit = (_bit), \
.flags = FLAG(TRIG, EXISTS), \
}
struct bus_clk_data {
struct bcm_clk_gate gate;
};
struct core_clk_data {
struct bcm_clk_gate gate;
};
struct peri_clk_data {
struct bcm_clk_gate gate;
struct bcm_clk_trig pre_trig;
struct bcm_clk_div pre_div;
struct bcm_clk_trig trig;
struct bcm_clk_div div;
struct bcm_clk_sel sel;
const char *clocks[]; /* must be last; use CLOCKS() to declare */
};
#define CLOCKS(...) { __VA_ARGS__, NULL, }
#define NO_CLOCKS { NULL, } /* Must use of no parent clocks */
struct refclk {
struct clk clk;
};
struct peri_clock {
struct clk clk;
struct peri_clk_data *data;
};
struct ccu_clock {
struct clk clk;
int num_policy_masks;
unsigned long policy_freq_offset;
int freq_bit_shift; /* 8 for most CCUs */
unsigned long policy_ctl_offset;
unsigned long policy0_mask_offset;
unsigned long policy1_mask_offset;
unsigned long policy2_mask_offset;
unsigned long policy3_mask_offset;
unsigned long policy0_mask2_offset;
unsigned long policy1_mask2_offset;
unsigned long policy2_mask2_offset;
unsigned long policy3_mask2_offset;
unsigned long lvm_en_offset;
int freq_id;
unsigned long *freq_tbl;
};
struct bus_clock {
struct clk clk;
struct bus_clk_data *data;
unsigned long *freq_tbl;
};
struct ref_clock {
struct clk clk;
};
static inline int is_same_clock(struct clk *a, struct clk *b)
{
return (a == b);
}
#define to_clk(p) (&((p)->clk))
#define name_to_clk(name) (&((name##_clk).clk))
/* declare a struct clk_lookup */
#define CLK_LK(name) \
{.con_id = __stringify(name##_clk), .clk = name_to_clk(name),}
static inline struct refclk *to_refclk(struct clk *clock)
{
return container_of(clock, struct refclk, clk);
}
static inline struct peri_clock *to_peri_clk(struct clk *clock)
{
return container_of(clock, struct peri_clock, clk);
}
static inline struct ccu_clock *to_ccu_clk(struct clk *clock)
{
return container_of(clock, struct ccu_clock, clk);
}
static inline struct bus_clock *to_bus_clk(struct clk *clock)
{
return container_of(clock, struct bus_clock, clk);
}
static inline struct ref_clock *to_ref_clk(struct clk *clock)
{
return container_of(clock, struct ref_clock, clk);
}
extern struct clk_ops peri_clk_ops;
extern struct clk_ops ccu_clk_ops;
extern struct clk_ops bus_clk_ops;
extern struct clk_ops ref_clk_ops;
extern int clk_get_and_enable(char *clkstr);
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