diff options
Diffstat (limited to 'drivers/clk/sunxi-ng/ccu_nkmp.c')
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_nkmp.c | 58 |
1 files changed, 45 insertions, 13 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c index e58c95787f94..ebd9436d2c7c 100644 --- a/drivers/clk/sunxi-ng/ccu_nkmp.c +++ b/drivers/clk/sunxi-ng/ccu_nkmp.c @@ -20,6 +20,18 @@ struct _ccu_nkmp { unsigned long p, min_p, max_p; }; +static unsigned long ccu_nkmp_calc_rate(unsigned long parent, + unsigned long n, unsigned long k, + unsigned long m, unsigned long p) +{ + u64 rate = parent; + + rate *= n * k; + do_div(rate, m * p); + + return rate; +} + static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate, struct _ccu_nkmp *nkmp) { @@ -33,7 +45,9 @@ static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate, for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) { unsigned long tmp_rate; - tmp_rate = parent * _n * _k / (_m * _p); + tmp_rate = ccu_nkmp_calc_rate(parent, + _n, _k, + _m, _p); if (tmp_rate > rate) continue; @@ -81,7 +95,7 @@ static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); - unsigned long n, m, k, p; + unsigned long n, m, k, p, rate; u32 reg; reg = readl(nkmp->common.base + nkmp->common.reg); @@ -107,7 +121,11 @@ static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw, p = reg >> nkmp->p.shift; p &= (1 << nkmp->p.width) - 1; - return (parent_rate * n * k >> p) / m; + rate = ccu_nkmp_calc_rate(parent_rate, n, k, m, 1 << p); + if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) + rate /= nkmp->fixed_post_div; + + return rate; } static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate, @@ -116,6 +134,9 @@ static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate, struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); struct _ccu_nkmp _nkmp; + if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) + rate *= nkmp->fixed_post_div; + _nkmp.min_n = nkmp->n.min ?: 1; _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width; _nkmp.min_k = nkmp->k.min ?: 1; @@ -127,17 +148,26 @@ static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate, ccu_nkmp_find_best(*parent_rate, rate, &_nkmp); - return *parent_rate * _nkmp.n * _nkmp.k / (_nkmp.m * _nkmp.p); + rate = ccu_nkmp_calc_rate(*parent_rate, _nkmp.n, _nkmp.k, + _nkmp.m, _nkmp.p); + if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) + rate = rate / nkmp->fixed_post_div; + + return rate; } static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw); + u32 n_mask, k_mask, m_mask, p_mask; struct _ccu_nkmp _nkmp; unsigned long flags; u32 reg; + if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV) + rate = rate * nkmp->fixed_post_div; + _nkmp.min_n = nkmp->n.min ?: 1; _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width; _nkmp.min_k = nkmp->k.min ?: 1; @@ -149,18 +179,20 @@ static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate, ccu_nkmp_find_best(parent_rate, rate, &_nkmp); + n_mask = GENMASK(nkmp->n.width + nkmp->n.shift - 1, nkmp->n.shift); + k_mask = GENMASK(nkmp->k.width + nkmp->k.shift - 1, nkmp->k.shift); + m_mask = GENMASK(nkmp->m.width + nkmp->m.shift - 1, nkmp->m.shift); + p_mask = GENMASK(nkmp->p.width + nkmp->p.shift - 1, nkmp->p.shift); + spin_lock_irqsave(nkmp->common.lock, flags); reg = readl(nkmp->common.base + nkmp->common.reg); - reg &= ~GENMASK(nkmp->n.width + nkmp->n.shift - 1, nkmp->n.shift); - reg &= ~GENMASK(nkmp->k.width + nkmp->k.shift - 1, nkmp->k.shift); - reg &= ~GENMASK(nkmp->m.width + nkmp->m.shift - 1, nkmp->m.shift); - reg &= ~GENMASK(nkmp->p.width + nkmp->p.shift - 1, nkmp->p.shift); - - reg |= (_nkmp.n - nkmp->n.offset) << nkmp->n.shift; - reg |= (_nkmp.k - nkmp->k.offset) << nkmp->k.shift; - reg |= (_nkmp.m - nkmp->m.offset) << nkmp->m.shift; - reg |= ilog2(_nkmp.p) << nkmp->p.shift; + reg &= ~(n_mask | k_mask | m_mask | p_mask); + + reg |= ((_nkmp.n - nkmp->n.offset) << nkmp->n.shift) & n_mask; + reg |= ((_nkmp.k - nkmp->k.offset) << nkmp->k.shift) & k_mask; + reg |= ((_nkmp.m - nkmp->m.offset) << nkmp->m.shift) & m_mask; + reg |= (ilog2(_nkmp.p) << nkmp->p.shift) & p_mask; writel(reg, nkmp->common.base + nkmp->common.reg); |