clk-aux-synth.rar_V2

#define pr_fmt(fmt) "clk-aux-synth: " fmt #include <linux/clk-provider.h> #include <linux/slab.h> #include <linux/io.h> #include <linux/err.h> #include "clk.h" /* * DOC: Auxiliary Synthesizer clock * * Aux synth gives rate for different values of eq, x and y * * Fout from synthesizer can be given from two equations: * Fout1 = (Fin * X/Y)/2 EQ1 * Fout2 = Fin * X/Y EQ2 */ #define to_clk_aux(_hw) container_of(_hw, struct clk_aux, hw) static struct aux_clk_masks default_aux_masks = { .eq_sel_mask = AUX_EQ_SEL_MASK, .eq_sel_shift = AUX_EQ_SEL_SHIFT, .eq1_mask = AUX_EQ1_SEL, .eq2_mask = AUX_EQ2_SEL, .xscale_sel_mask = AUX_XSCALE_MASK, .xscale_sel_shift = AUX_XSCALE_SHIFT, .yscale_sel_mask = AUX_YSCALE_MASK, .yscale_sel_shift = AUX_YSCALE_SHIFT, .enable_bit = AUX_SYNT_ENB, }; static unsigned long aux_calc_rate(struct clk_hw *hw, unsigned long prate, int index) { struct clk_aux *aux = to_clk_aux(hw); struct aux_rate_tbl *rtbl = aux->rtbl; u8 eq = rtbl[index].eq ? 1 : 2; return (((prate / 10000) * rtbl[index].xscale) / (rtbl[index].yscale * eq)) * 10000; } static long clk_aux_round_rate(struct clk_hw *hw, unsigned long drate, unsigned long *prate) { struct clk_aux *aux = to_clk_aux(hw); int unused; return clk_round_rate_index(hw, drate, *prate, aux_calc_rate, aux->rtbl_cnt, &unused); } static unsigned long clk_aux_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct clk_aux *aux = to_clk_aux(hw); unsigned int num = 1, den = 1, val, eqn; unsigned long flags = 0; if (aux->lock) spin_lock_irqsave(aux->lock, flags); val = readl_relaxed(aux->reg); if (aux->lock) spin_unlock_irqrestore(aux->lock, flags); eqn = (val >> aux->masks->eq_sel_shift) & aux->masks->eq_sel_mask; if (eqn == aux->masks->eq1_mask) den = 2; /* calculate numerator */ num = (val >> aux->masks->xscale_sel_shift) & aux->masks->xscale_sel_mask; /* calculate denominator */ den *= (val >> aux->masks->yscale_sel_shift) & aux->masks->yscale_sel_mask; if (!den) return 0; return (((parent_rate / 10000) * num) / den) * 10000; } /* Configures new clock rate of aux */ static int clk_aux_set_rate(struct clk_hw *hw, unsigned long drate, unsigned long prate) { struct clk_aux *aux = to_clk_aux(hw); struct aux_rate_tbl *rtbl = aux->rtbl; unsigned long val, flags = 0; int i; clk_round_rate_index(hw, drate, prate, aux_calc_rate, aux->rtbl_cnt, &i); if (aux->lock) spin_lock_irqsave(aux->lock, flags); val = readl_relaxed(aux->reg) & ~(aux->masks->eq_sel_mask << aux->masks->eq_sel_shift); val |= (rtbl[i].eq & aux->masks->eq_sel_mask) << aux->masks->eq_sel_shift; val &= ~(aux->masks->xscale_sel_mask << aux->masks->xscale_sel_shift); val |= (rtbl[i].xscale & aux->masks->xscale_sel_mask) << aux->masks->xscale_sel_shift; val &= ~(aux->masks->yscale_sel_mask << aux->masks->yscale_sel_shift); val |= (rtbl[i].yscale & aux->masks->yscale_sel_mask) << aux->masks->yscale_sel_shift; writel_relaxed(val, aux->reg); if (aux->lock) spin_unlock_irqrestore(aux->lock, flags); return 0; } static struct clk_ops clk_aux_ops = { .recalc_rate = clk_aux_recalc_rate, .round_rate = clk_aux_round_rate, .set_rate = clk_aux_set_rate, }; struct clk *clk_register_aux(const char *aux_name, const char *gate_name, const char *parent_name, unsigned long flags, void __iomem *reg, struct aux_clk_masks *masks, struct aux_rate_tbl *rtbl, u8 rtbl_cnt, spinlock_t *lock, struct clk **gate_clk) { struct clk_aux *aux; struct clk_init_data init; struct clk *clk; if (!aux_name || !parent_name || !reg || !rtbl || !rtbl_cnt) { pr_err("Invalid arguments passed"); return ERR_PTR(-EINVAL); } aux = kzalloc(sizeof(*aux), GFP_KERNEL); if (!aux) { pr_err("could not allocate aux clk\n"); return ERR_PTR(-ENOMEM); } /* struct clk_aux assignments */ if (!masks) aux->masks = &default_aux_masks; else aux->masks = masks; aux->reg = reg; aux->rtbl = rtbl; aux->rtbl_cnt = rtbl_cnt; aux->lock = lock; aux->hw.init = &init; init.name = aux_name; init.ops = &clk_aux_ops; init.flags = flags; init.parent_names = &parent_name; init.num_parents = 1; clk = clk_register(NULL, &aux->hw); if (IS_ERR_OR_NULL(clk)) goto free_aux; if (gate_name) { struct clk *tgate_clk; tgate_clk = clk_register_gate(NULL, gate_name, aux_name, CLK_SET_RATE_PARENT, reg, aux->masks->enable_bit, 0, lock); if (IS_ERR_OR_NULL(tgate_clk)) goto free_aux; if (gate_clk) *gate_clk = tgate_clk; } return clk; free_aux: kfree(aux); pr_err("clk register failed\n"); return NULL; }