79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
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* clk-gate.c - generic barebox clock support. Based on Linux clk support
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*
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* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <io.h>
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#include <malloc.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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struct clk_gate {
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struct clk clk;
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void __iomem *reg;
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int shift;
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const char *parent;
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};
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static int clk_gate_enable(struct clk *clk)
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{
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struct clk_gate *g = container_of(clk, struct clk_gate, clk);
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u32 val;
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val = readl(g->reg);
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val |= 1 << g->shift;
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writel(val, g->reg);
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return 0;
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}
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static void clk_gate_disable(struct clk *clk)
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{
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struct clk_gate *g = container_of(clk, struct clk_gate, clk);
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u32 val;
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val = readl(g->reg);
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val &= ~(1 << g->shift);
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writel(val, g->reg);
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}
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struct clk_ops clk_gate_ops = {
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.enable = clk_gate_enable,
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.disable = clk_gate_disable,
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};
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struct clk *clk_gate(const char *name, const char *parent, void __iomem *reg,
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u8 shift)
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{
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struct clk_gate *g = xzalloc(sizeof(*g));
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int ret;
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g->parent = parent;
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g->reg = reg;
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g->shift = shift;
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g->clk.ops = &clk_gate_ops;
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g->clk.name = name;
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g->clk.parent_names = &g->parent;
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g->clk.num_parents = 1;
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ret = clk_register(&g->clk);
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if (ret) {
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free(g);
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return ERR_PTR(ret);
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}
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return &g->clk;
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}
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