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clk: bcm281xx: don't use unnamed structs or unions

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The Broadcom Kona clock code, as originally written, made use of
unnamed union and struct fields.  This is a feature present in C11,
and is a GNU extension otherwise.  It worked very well for me.

Unfortunately, Russell King reported that this feature was not
supported in a build environment he used, which meant attempting
to build this code failed spectacularly.

Add names to these unnamed fields, and update the code accordingly.

Reported-by: Russell King <linux@arm.linux.org.uk>
Tested-by: Markus Mayer <markus.mayer@linaro.org>
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Alex Elder 2014-04-07 08:22:12 -05:00 committed by Mike Turquette
parent d1db0eea85
commit e813d49d2a
3 changed files with 64 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/clk/bcm/clk-kona-setup.c
View File

@ -27,7 +27,7 @@ LIST_HEAD(ccu_list); /* The list of set up CCUs */
static bool clk_requires_trigger(struct kona_clk *bcm_clk)
{
struct peri_clk_data *peri = bcm_clk->peri;
struct peri_clk_data *peri = bcm_clk->u.peri;
struct bcm_clk_sel *sel;
struct bcm_clk_div *div;
@ -63,7 +63,7 @@ static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
u32 limit;
BUG_ON(bcm_clk->type != bcm_clk_peri);
peri = bcm_clk->peri;
peri = bcm_clk->u.peri;
name = bcm_clk->name;
range = bcm_clk->ccu->range;
@ -81,19 +81,19 @@ static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
div = &peri->div;
if (divider_exists(div)) {
if (div->offset > limit) {
if (div->u.s.offset > limit) {
pr_err("%s: bad divider offset for %s (%u > %u)\n",
__func__, name, div->offset, limit);
__func__, name, div->u.s.offset, limit);
return false;
}
}
div = &peri->pre_div;
if (divider_exists(div)) {
if (div->offset > limit) {
if (div->u.s.offset > limit) {
pr_err("%s: bad pre-divider offset for %s "
"(%u > %u)\n",
__func__, name, div->offset, limit);
__func__, name, div->u.s.offset, limit);
return false;
}
}
@ -249,21 +249,22 @@ static bool div_valid(struct bcm_clk_div *div, const char *field_name,
{
if (divider_is_fixed(div)) {
/* Any fixed divider value but 0 is OK */
if (div->fixed == 0) {
if (div->u.fixed == 0) {
pr_err("%s: bad %s fixed value 0 for %s\n", __func__,
field_name, clock_name);
return false;
}
return true;
}
if (!bitfield_valid(div->shift, div->width, field_name, clock_name))
if (!bitfield_valid(div->u.s.shift, div->u.s.width,
field_name, clock_name))
return false;
if (divider_has_fraction(div))
if (div->frac_width > div->width) {
if (div->u.s.frac_width > div->u.s.width) {
pr_warn("%s: bad %s fraction width for %s (%u > %u)\n",
__func__, field_name, clock_name,
div->frac_width, div->width);
div->u.s.frac_width, div->u.s.width);
return false;
}
@ -278,7 +279,7 @@ static bool div_valid(struct bcm_clk_div *div, const char *field_name,
*/
static bool kona_dividers_valid(struct kona_clk *bcm_clk)
{
struct peri_clk_data *peri = bcm_clk->peri;
struct peri_clk_data *peri = bcm_clk->u.peri;
struct bcm_clk_div *div;
struct bcm_clk_div *pre_div;
u32 limit;
@ -295,7 +296,7 @@ static bool kona_dividers_valid(struct kona_clk *bcm_clk)
limit = BITS_PER_BYTE * sizeof(u32);
return div->frac_width + pre_div->frac_width <= limit;
return div->u.s.frac_width + pre_div->u.s.frac_width <= limit;
}
@ -328,7 +329,7 @@ peri_clk_data_valid(struct kona_clk *bcm_clk)
if (!peri_clk_data_offsets_valid(bcm_clk))
return false;
peri = bcm_clk->peri;
peri = bcm_clk->u.peri;
name = bcm_clk->name;
gate = &peri->gate;
if (gate_exists(gate) && !gate_valid(gate, "gate", name))
@ -588,12 +589,12 @@ static void bcm_clk_teardown(struct kona_clk *bcm_clk)
{
switch (bcm_clk->type) {
case bcm_clk_peri:
peri_clk_teardown(bcm_clk->data, &bcm_clk->init_data);
peri_clk_teardown(bcm_clk->u.data, &bcm_clk->init_data);
break;
default:
break;
}
bcm_clk->data = NULL;
bcm_clk->u.data = NULL;
bcm_clk->type = bcm_clk_none;
}
@ -644,7 +645,7 @@ struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
break;
}
bcm_clk->type = type;
bcm_clk->data = data;
bcm_clk->u.data = data;
/* Make sure everything makes sense before we set it up */
if (!kona_clk_valid(bcm_clk)) {

64
drivers/clk/bcm/clk-kona.c
View File

@ -61,7 +61,7 @@ u64 do_div_round_closest(u64 dividend, unsigned long divisor)
/* Convert a divider into the scaled divisor value it represents. */
static inline u64 scaled_div_value(struct bcm_clk_div *div, u32 reg_div)
{
return (u64)reg_div + ((u64)1 << div->frac_width);
return (u64)reg_div + ((u64)1 << div->u.s.frac_width);
}
/*
@ -77,7 +77,7 @@ u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value, u32 billionths)
BUG_ON(billionths >= BILLION);
combined = (u64)div_value * BILLION + billionths;
combined <<= div->frac_width;
combined <<= div->u.s.frac_width;
return do_div_round_closest(combined, BILLION);
}
@ -87,7 +87,7 @@ static inline u64
scaled_div_min(struct bcm_clk_div *div)
{
if (divider_is_fixed(div))
return (u64)div->fixed;
return (u64)div->u.fixed;
return scaled_div_value(div, 0);
}
@ -98,9 +98,9 @@ u64 scaled_div_max(struct bcm_clk_div *div)
u32 reg_div;
if (divider_is_fixed(div))
return (u64)div->fixed;
return (u64)div->u.fixed;
reg_div = ((u32)1 << div->width) - 1;
reg_div = ((u32)1 << div->u.s.width) - 1;
return scaled_div_value(div, reg_div);
}
@ -115,7 +115,7 @@ divider(struct bcm_clk_div *div, u64 scaled_div)
BUG_ON(scaled_div < scaled_div_min(div));
BUG_ON(scaled_div > scaled_div_max(div));
return (u32)(scaled_div - ((u64)1 << div->frac_width));
return (u32)(scaled_div - ((u64)1 << div->u.s.frac_width));
}
/* Return a rate scaled for use when dividing by a scaled divisor. */
@ -125,7 +125,7 @@ scale_rate(struct bcm_clk_div *div, u32 rate)
if (divider_is_fixed(div))
return (u64)rate;
return (u64)rate << div->frac_width;
return (u64)rate << div->u.s.frac_width;
}
/* CCU access */
@ -398,14 +398,14 @@ static u64 divider_read_scaled(struct ccu_data *ccu, struct bcm_clk_div *div)
u32 reg_div;
if (divider_is_fixed(div))
return (u64)div->fixed;
return (u64)div->u.fixed;
flags = ccu_lock(ccu);
reg_val = __ccu_read(ccu, div->offset);
reg_val = __ccu_read(ccu, div->u.s.offset);
ccu_unlock(ccu, flags);
/* Extract the full divider field from the register value */
reg_div = bitfield_extract(reg_val, div->shift, div->width);
reg_div = bitfield_extract(reg_val, div->u.s.shift, div->u.s.width);
/* Return the scaled divisor value it represents */
return scaled_div_value(div, reg_div);
@ -433,16 +433,17 @@ static int __div_commit(struct ccu_data *ccu, struct bcm_clk_gate *gate,
* state was defined in the device tree, we just find out
* what its current value is rather than updating it.
*/
if (div->scaled_div == BAD_SCALED_DIV_VALUE) {
reg_val = __ccu_read(ccu, div->offset);
reg_div = bitfield_extract(reg_val, div->shift, div->width);
div->scaled_div = scaled_div_value(div, reg_div);
if (div->u.s.scaled_div == BAD_SCALED_DIV_VALUE) {
reg_val = __ccu_read(ccu, div->u.s.offset);
reg_div = bitfield_extract(reg_val, div->u.s.shift,
div->u.s.width);
div->u.s.scaled_div = scaled_div_value(div, reg_div);
return 0;
}
/* Convert the scaled divisor to the value we need to record */
reg_div = divider(div, div->scaled_div);
reg_div = divider(div, div->u.s.scaled_div);
/* Clock needs to be enabled before changing the rate */
enabled = __is_clk_gate_enabled(ccu, gate);
@ -452,9 +453,10 @@ static int __div_commit(struct ccu_data *ccu, struct bcm_clk_gate *gate,
}
/* Replace the divider value and record the result */
reg_val = __ccu_read(ccu, div->offset);
reg_val = bitfield_replace(reg_val, div->shift, div->width, reg_div);
__ccu_write(ccu, div->offset, reg_val);
reg_val = __ccu_read(ccu, div->u.s.offset);
reg_val = bitfield_replace(reg_val, div->u.s.shift, div->u.s.width,
reg_div);
__ccu_write(ccu, div->u.s.offset, reg_val);
/* If the trigger fails we still want to disable the gate */
if (!__clk_trigger(ccu, trig))
@ -490,11 +492,11 @@ static int divider_write(struct ccu_data *ccu, struct bcm_clk_gate *gate,
BUG_ON(divider_is_fixed(div));
previous = div->scaled_div;
previous = div->u.s.scaled_div;
if (previous == scaled_div)
return 0; /* No change */
div->scaled_div = scaled_div;
div->u.s.scaled_div = scaled_div;
flags = ccu_lock(ccu);
__ccu_write_enable(ccu);
@ -505,7 +507,7 @@ static int divider_write(struct ccu_data *ccu, struct bcm_clk_gate *gate,
ccu_unlock(ccu, flags);
if (ret)
div->scaled_div = previous; /* Revert the change */
div->u.s.scaled_div = previous; /* Revert the change */
return ret;
@ -802,7 +804,7 @@ static int selector_write(struct ccu_data *ccu, struct bcm_clk_gate *gate,
static int kona_peri_clk_enable(struct clk_hw *hw)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct bcm_clk_gate *gate = &bcm_clk->peri->gate;
struct bcm_clk_gate *gate = &bcm_clk->u.peri->gate;
return clk_gate(bcm_clk->ccu, bcm_clk->name, gate, true);
}
@ -810,7 +812,7 @@ static int kona_peri_clk_enable(struct clk_hw *hw)
static void kona_peri_clk_disable(struct clk_hw *hw)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct bcm_clk_gate *gate = &bcm_clk->peri->gate;
struct bcm_clk_gate *gate = &bcm_clk->u.peri->gate;
(void)clk_gate(bcm_clk->ccu, bcm_clk->name, gate, false);
}
@ -818,7 +820,7 @@ static void kona_peri_clk_disable(struct clk_hw *hw)
static int kona_peri_clk_is_enabled(struct clk_hw *hw)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct bcm_clk_gate *gate = &bcm_clk->peri->gate;
struct bcm_clk_gate *gate = &bcm_clk->u.peri->gate;
return is_clk_gate_enabled(bcm_clk->ccu, gate) ? 1 : 0;
}
@ -827,7 +829,7 @@ static unsigned long kona_peri_clk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct peri_clk_data *data = bcm_clk->peri;
struct peri_clk_data *data = bcm_clk->u.peri;
return clk_recalc_rate(bcm_clk->ccu, &data->div, &data->pre_div,
parent_rate);
@ -837,20 +839,20 @@ static long kona_peri_clk_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct bcm_clk_div *div = &bcm_clk->peri->div;
struct bcm_clk_div *div = &bcm_clk->u.peri->div;
if (!divider_exists(div))
return __clk_get_rate(hw->clk);
/* Quietly avoid a zero rate */
return round_rate(bcm_clk->ccu, div, &bcm_clk->peri->pre_div,
return round_rate(bcm_clk->ccu, div, &bcm_clk->u.peri->pre_div,
rate ? rate : 1, *parent_rate, NULL);
}
static int kona_peri_clk_set_parent(struct clk_hw *hw, u8 index)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct peri_clk_data *data = bcm_clk->peri;
struct peri_clk_data *data = bcm_clk->u.peri;
struct bcm_clk_sel *sel = &data->sel;
struct bcm_clk_trig *trig;
int ret;
@ -884,7 +886,7 @@ static int kona_peri_clk_set_parent(struct clk_hw *hw, u8 index)
static u8 kona_peri_clk_get_parent(struct clk_hw *hw)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct peri_clk_data *data = bcm_clk->peri;
struct peri_clk_data *data = bcm_clk->u.peri;
u8 index;
index = selector_read_index(bcm_clk->ccu, &data->sel);
@ -897,7 +899,7 @@ static int kona_peri_clk_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct kona_clk *bcm_clk = to_kona_clk(hw);
struct peri_clk_data *data = bcm_clk->peri;
struct peri_clk_data *data = bcm_clk->u.peri;
struct bcm_clk_div *div = &data->div;
u64 scaled_div = 0;
int ret;
@ -958,7 +960,7 @@ struct clk_ops kona_peri_clk_ops = {
static bool __peri_clk_init(struct kona_clk *bcm_clk)
{
struct ccu_data *ccu = bcm_clk->ccu;
struct peri_clk_data *peri = bcm_clk->peri;
struct peri_clk_data *peri = bcm_clk->u.peri;
const char *name = bcm_clk->name;
struct bcm_clk_trig *trig;

28
drivers/clk/bcm/clk-kona.h
View File

@ -57,7 +57,7 @@
#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)
(div)->u.s.frac_width > 0)
#define selector_exists(sel) ((sel)->width != 0)
#define trigger_exists(trig) FLAG_TEST(trig, TRIG, EXISTS)
@ -244,9 +244,9 @@ struct bcm_clk_div {
u32 frac_width; /* field fraction width */
u64 scaled_div; /* scaled divider value */
};
} s;
u32 fixed; /* non-zero fixed divider value */
};
} u;
u32 flags; /* BCM_CLK_DIV_FLAGS_* below */
};
@ -263,28 +263,28 @@ struct bcm_clk_div {
/* A fixed (non-zero) divider */
#define FIXED_DIVIDER(_value) \
{ \
.fixed = (_value), \
.u.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, \
.u.s.offset = (_offset), \
.u.s.shift = (_shift), \
.u.s.width = (_width), \
.u.s.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, \
.u.s.offset = (_offset), \
.u.s.shift = (_shift), \
.u.s.width = (_width), \
.u.s.frac_width = (_frac_width), \
.u.s.scaled_div = BAD_SCALED_DIV_VALUE, \
.flags = FLAG(DIV, EXISTS), \
}
@ -380,7 +380,7 @@ struct kona_clk {
union {
void *data;
struct peri_clk_data *peri;
};
} u;
};
#define to_kona_clk(_hw) \
container_of(_hw, struct kona_clk, hw)