Commit e813d49d authored by Alex Elder's avatar Alex Elder Committed by Mike Turquette
Browse files

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



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: default avatarRussell King <linux@arm.linux.org.uk>
Tested-by: default avatarMarkus Mayer <markus.mayer@linaro.org>
Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent d1db0eea

drivers/clk/bcm/clk-kona-setup.c

+17 −16
Original line number Diff line number Diff line
@@ -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)) {

drivers/clk/bcm/clk-kona.c

+33 −31
Original line number Diff line number Diff line
@@ -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;

drivers/clk/bcm/clk-kona.h

+14 −14
Original line number Diff line number Diff line
@@ -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)

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