From e813d49d2a477e3b64a9ff32ca7db5737d36cd91 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 7 Apr 2014 08:22:12 -0500 Subject: [PATCH] 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: Russell King Tested-by: Markus Mayer Signed-off-by: Alex Elder Signed-off-by: Mike Turquette --- drivers/clk/bcm/clk-kona-setup.c | 33 ++++++++-------- drivers/clk/bcm/clk-kona.c | 64 ++++++++++++++++---------------- drivers/clk/bcm/clk-kona.h | 28 +++++++------- 3 files changed, 64 insertions(+), 61 deletions(-) diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c index c7607feb18dd..54a06526f64f 100644 --- a/drivers/clk/bcm/clk-kona-setup.c +++ b/drivers/clk/bcm/clk-kona-setup.c @@ -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)) { diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c index e3d339e08309..db11a87449f2 100644 --- a/drivers/clk/bcm/clk-kona.c +++ b/drivers/clk/bcm/clk-kona.c @@ -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; diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h index 5e139adc3dc5..dee690951bb6 100644 --- a/drivers/clk/bcm/clk-kona.h +++ b/drivers/clk/bcm/clk-kona.h @@ -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) -- 2.20.1