/* * mmp AXI peripharal clock operation source file * * Copyright (C) 2012 Marvell * Chao Xie <xiechao.mail@gmail.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/kernel.h> #include <linux/io.h> #include <linux/err.h> #include <linux/delay.h> #include <linux/slab.h> #include "clk.h" #define to_clk_apmu(clk) (container_of(clk, struct clk_apmu, clk)) struct clk_apmu { struct clk_hw hw; void __iomem *base; u32 rst_mask; u32 enable_mask; spinlock_t *lock; }; static int clk_apmu_enable(struct clk_hw *hw) { struct clk_apmu *apmu = to_clk_apmu(hw); unsigned long data; unsigned long flags = 0; if (apmu->lock) spin_lock_irqsave(apmu->lock, flags); data = readl_relaxed(apmu->base) | apmu->enable_mask; writel_relaxed(data, apmu->base); if (apmu->lock) spin_unlock_irqrestore(apmu->lock, flags); return 0; } static void clk_apmu_disable(struct clk_hw *hw) { struct clk_apmu *apmu = to_clk_apmu(hw); unsigned long data; unsigned long flags = 0; if (apmu->lock) spin_lock_irqsave(apmu->lock, flags); data = readl_relaxed(apmu->base) & ~apmu->enable_mask; writel_relaxed(data, apmu->base); if (apmu->lock) spin_unlock_irqrestore(apmu->lock, flags); } static const struct clk_ops clk_apmu_ops = { .enable = clk_apmu_enable, .disable = clk_apmu_disable, }; struct clk *mmp_clk_register_apmu(const char *name, const char *parent_name, void __iomem *base, u32 enable_mask, spinlock_t *lock) { struct clk_apmu *apmu; struct clk *clk; struct clk_init_data init; apmu = kzalloc(sizeof(*apmu), GFP_KERNEL); if (!apmu) return NULL; init.name = name; init.ops = &clk_apmu_ops; init.flags = CLK_SET_RATE_PARENT; init.parent_names = (parent_name ? &parent_name : NULL); init.num_parents = (parent_name ? 1 : 0); apmu->base = base; apmu->enable_mask = enable_mask; apmu->lock = lock; apmu->hw.init = &init; clk = clk_register(NULL, &apmu->hw); if (IS_ERR(clk)) kfree(apmu); return clk; }