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232 lines
5.8 KiB
232 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Maxime Ripard |
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* Maxime Ripard <[email protected]> |
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*/ |
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#include <linux/clk-provider.h> |
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#include <linux/io.h> |
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#include "ccu_gate.h" |
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#include "ccu_nkmp.h" |
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struct _ccu_nkmp { |
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unsigned long n, min_n, max_n; |
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unsigned long k, min_k, max_k; |
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unsigned long m, min_m, max_m; |
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unsigned long p, min_p, max_p; |
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}; |
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static unsigned long ccu_nkmp_calc_rate(unsigned long parent, |
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unsigned long n, unsigned long k, |
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unsigned long m, unsigned long p) |
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{ |
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u64 rate = parent; |
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rate *= n * k; |
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do_div(rate, m * p); |
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return rate; |
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} |
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static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate, |
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struct _ccu_nkmp *nkmp) |
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{ |
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unsigned long best_rate = 0; |
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unsigned long best_n = 0, best_k = 0, best_m = 0, best_p = 0; |
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unsigned long _n, _k, _m, _p; |
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for (_k = nkmp->min_k; _k <= nkmp->max_k; _k++) { |
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for (_n = nkmp->min_n; _n <= nkmp->max_n; _n++) { |
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for (_m = nkmp->min_m; _m <= nkmp->max_m; _m++) { |
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for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) { |
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unsigned long tmp_rate; |
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tmp_rate = ccu_nkmp_calc_rate(parent, |
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_n, _k, |
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_m, _p); |
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if (tmp_rate > rate) |
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continue; |
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if ((rate - tmp_rate) < (rate - best_rate)) { |
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best_rate = tmp_rate; |
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best_n = _n; |
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best_k = _k; |
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best_m = _m; |
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best_p = _p; |
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} |
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} |
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} |
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} |
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} |
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nkmp->n = best_n; |
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nkmp->k = best_k; |
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nkmp->m = best_m; |
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nkmp->p = best_p; |
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} |
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static void ccu_nkmp_disable(struct clk_hw *hw) |
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{ |
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struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); |
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return ccu_gate_helper_disable(&nkmp->common, nkmp->enable); |
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} |
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static int ccu_nkmp_enable(struct clk_hw *hw) |
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{ |
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struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); |
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return ccu_gate_helper_enable(&nkmp->common, nkmp->enable); |
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} |
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static int ccu_nkmp_is_enabled(struct clk_hw *hw) |
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{ |
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struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); |
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return ccu_gate_helper_is_enabled(&nkmp->common, nkmp->enable); |
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} |
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static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw, |
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unsigned long parent_rate) |
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{ |
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struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); |
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unsigned long n, m, k, p, rate; |
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u32 reg; |
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reg = readl(nkmp->common.base + nkmp->common.reg); |
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n = reg >> nkmp->n.shift; |
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n &= (1 << nkmp->n.width) - 1; |
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n += nkmp->n.offset; |
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if (!n) |
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n++; |
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k = reg >> nkmp->k.shift; |
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k &= (1 << nkmp->k.width) - 1; |
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k += nkmp->k.offset; |
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if (!k) |
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k++; |
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m = reg >> nkmp->m.shift; |
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m &= (1 << nkmp->m.width) - 1; |
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m += nkmp->m.offset; |
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if (!m) |
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m++; |
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p = reg >> nkmp->p.shift; |
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p &= (1 << nkmp->p.width) - 1; |
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rate = ccu_nkmp_calc_rate(parent_rate, n, k, m, 1 << p); |
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if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) |
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rate /= nkmp->fixed_post_div; |
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return rate; |
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} |
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static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long *parent_rate) |
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{ |
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struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); |
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struct _ccu_nkmp _nkmp; |
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if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) |
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rate *= nkmp->fixed_post_div; |
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if (nkmp->max_rate && rate > nkmp->max_rate) { |
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rate = nkmp->max_rate; |
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if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) |
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rate /= nkmp->fixed_post_div; |
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return rate; |
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} |
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_nkmp.min_n = nkmp->n.min ?: 1; |
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_nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width; |
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_nkmp.min_k = nkmp->k.min ?: 1; |
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_nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width; |
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_nkmp.min_m = 1; |
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_nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width; |
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_nkmp.min_p = 1; |
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_nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1); |
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ccu_nkmp_find_best(*parent_rate, rate, &_nkmp); |
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rate = ccu_nkmp_calc_rate(*parent_rate, _nkmp.n, _nkmp.k, |
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_nkmp.m, _nkmp.p); |
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if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) |
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rate = rate / nkmp->fixed_post_div; |
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return rate; |
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} |
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static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate, |
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unsigned long parent_rate) |
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{ |
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struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); |
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u32 n_mask = 0, k_mask = 0, m_mask = 0, p_mask = 0; |
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struct _ccu_nkmp _nkmp; |
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unsigned long flags; |
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u32 reg; |
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if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) |
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rate = rate * nkmp->fixed_post_div; |
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_nkmp.min_n = nkmp->n.min ?: 1; |
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_nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width; |
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_nkmp.min_k = nkmp->k.min ?: 1; |
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_nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width; |
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_nkmp.min_m = 1; |
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_nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width; |
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_nkmp.min_p = 1; |
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_nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1); |
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ccu_nkmp_find_best(parent_rate, rate, &_nkmp); |
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/* |
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* If width is 0, GENMASK() macro may not generate expected mask (0) |
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* as it falls under undefined behaviour by C standard due to shifts |
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* which are equal or greater than width of left operand. This can |
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* be easily avoided by explicitly checking if width is 0. |
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*/ |
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if (nkmp->n.width) |
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n_mask = GENMASK(nkmp->n.width + nkmp->n.shift - 1, |
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nkmp->n.shift); |
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if (nkmp->k.width) |
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k_mask = GENMASK(nkmp->k.width + nkmp->k.shift - 1, |
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nkmp->k.shift); |
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if (nkmp->m.width) |
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m_mask = GENMASK(nkmp->m.width + nkmp->m.shift - 1, |
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nkmp->m.shift); |
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if (nkmp->p.width) |
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p_mask = GENMASK(nkmp->p.width + nkmp->p.shift - 1, |
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nkmp->p.shift); |
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spin_lock_irqsave(nkmp->common.lock, flags); |
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reg = readl(nkmp->common.base + nkmp->common.reg); |
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reg &= ~(n_mask | k_mask | m_mask | p_mask); |
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reg |= ((_nkmp.n - nkmp->n.offset) << nkmp->n.shift) & n_mask; |
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reg |= ((_nkmp.k - nkmp->k.offset) << nkmp->k.shift) & k_mask; |
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reg |= ((_nkmp.m - nkmp->m.offset) << nkmp->m.shift) & m_mask; |
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reg |= (ilog2(_nkmp.p) << nkmp->p.shift) & p_mask; |
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writel(reg, nkmp->common.base + nkmp->common.reg); |
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spin_unlock_irqrestore(nkmp->common.lock, flags); |
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ccu_helper_wait_for_lock(&nkmp->common, nkmp->lock); |
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return 0; |
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} |
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const struct clk_ops ccu_nkmp_ops = { |
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.disable = ccu_nkmp_disable, |
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.enable = ccu_nkmp_enable, |
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.is_enabled = ccu_nkmp_is_enabled, |
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.recalc_rate = ccu_nkmp_recalc_rate, |
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.round_rate = ccu_nkmp_round_rate, |
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.set_rate = ccu_nkmp_set_rate, |
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};
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