Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
457 | 98.92% | 1 | 33.33% | |
3 | 0.65% | 1 | 33.33% | |
2 | 0.43% | 1 | 33.33% | |
Total | 462 | 3 |
Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Maxime Ripard | 457 | 98.92% | 1 | 33.33% |
Stephen Boyd | 3 | 0.65% | 1 | 33.33% |
Thomas Gleixner | 2 | 0.43% | 1 | 33.33% |
Total | 462 | 3 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2016 Maxime Ripard * Maxime Ripard <maxime.ripard@free-electrons.com> */ #include <linux/clk-provider.h> #include <linux/io.h> #include <linux/spinlock.h> #include "ccu_phase.h" static int ccu_phase_get_phase(struct clk_hw *hw) { struct ccu_phase *phase = hw_to_ccu_phase(hw); struct clk_hw *parent, *grandparent; unsigned int parent_rate, grandparent_rate; u16 step, parent_div; u32 reg; u8 delay; reg = readl(phase->common.base + phase->common.reg); delay = (reg >> phase->shift); delay &= (1 << phase->width) - 1; if (!delay) return 180; /* Get our parent clock, it's the one that can adjust its rate */ parent = clk_hw_get_parent(hw); if (!parent) return -EINVAL; /* And its rate */ parent_rate = clk_hw_get_rate(parent); if (!parent_rate) return -EINVAL; /* Now, get our parent's parent (most likely some PLL) */ grandparent = clk_hw_get_parent(parent); if (!grandparent) return -EINVAL; /* And its rate */ grandparent_rate = clk_hw_get_rate(grandparent); if (!grandparent_rate) return -EINVAL; /* Get our parent clock divider */ parent_div = grandparent_rate / parent_rate; step = DIV_ROUND_CLOSEST(360, parent_div); return delay * step; } static int ccu_phase_set_phase(struct clk_hw *hw, int degrees) { struct ccu_phase *phase = hw_to_ccu_phase(hw); struct clk_hw *parent, *grandparent; unsigned int parent_rate, grandparent_rate; unsigned long flags; u32 reg; u8 delay; /* Get our parent clock, it's the one that can adjust its rate */ parent = clk_hw_get_parent(hw); if (!parent) return -EINVAL; /* And its rate */ parent_rate = clk_hw_get_rate(parent); if (!parent_rate) return -EINVAL; /* Now, get our parent's parent (most likely some PLL) */ grandparent = clk_hw_get_parent(parent); if (!grandparent) return -EINVAL; /* And its rate */ grandparent_rate = clk_hw_get_rate(grandparent); if (!grandparent_rate) return -EINVAL; if (degrees != 180) { u16 step, parent_div; /* Get our parent divider */ parent_div = grandparent_rate / parent_rate; /* * We can only outphase the clocks by multiple of the * PLL's period. * * Since our parent clock is only a divider, and the * formula to get the outphasing in degrees is deg = * 360 * delta / period * * If we simplify this formula, we can see that the * only thing that we're concerned about is the number * of period we want to outphase our clock from, and * the divider set by our parent clock. */ step = DIV_ROUND_CLOSEST(360, parent_div); delay = DIV_ROUND_CLOSEST(degrees, step); } else { delay = 0; } spin_lock_irqsave(phase->common.lock, flags); reg = readl(phase->common.base + phase->common.reg); reg &= ~GENMASK(phase->width + phase->shift - 1, phase->shift); writel(reg | (delay << phase->shift), phase->common.base + phase->common.reg); spin_unlock_irqrestore(phase->common.lock, flags); return 0; } const struct clk_ops ccu_phase_ops = { .get_phase = ccu_phase_get_phase, .set_phase = ccu_phase_set_phase, };