146 lines
2.9 KiB
C
146 lines
2.9 KiB
C
/*
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* clk-gate2.c - barebox 2-bit clock support. Based on Linux clk support
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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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#include "clk.h"
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struct clk_gate2 {
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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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#define CLK_GATE_INVERTED (1 << 0)
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unsigned flags;
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};
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#define to_clk_gate2(_clk) container_of(_clk, struct clk_gate2, clk)
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static int clk_gate2_enable(struct clk *clk)
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{
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struct clk_gate2 *g = to_clk_gate2(clk);
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u32 val;
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val = readl(g->reg);
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if (g->flags & CLK_GATE_INVERTED)
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val &= ~(3 << g->shift);
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else
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val |= 3 << 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_gate2_disable(struct clk *clk)
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{
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struct clk_gate2 *g = to_clk_gate2(clk);
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u32 val;
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val = readl(g->reg);
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if (g->flags & CLK_GATE_INVERTED)
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val |= 3 << g->shift;
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else
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val &= ~(3 << g->shift);
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writel(val, g->reg);
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}
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static int clk_gate2_is_enabled(struct clk *clk)
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{
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struct clk_gate2 *g = to_clk_gate2(clk);
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u32 val;
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val = readl(g->reg);
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if (val & (1 << g->shift))
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return g->flags & CLK_GATE_INVERTED ? 0 : 1;
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else
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return g->flags & CLK_GATE_INVERTED ? 1 : 0;
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}
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static struct clk_ops clk_gate2_ops = {
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.set_rate = clk_parent_set_rate,
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.round_rate = clk_parent_round_rate,
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.enable = clk_gate2_enable,
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.disable = clk_gate2_disable,
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.is_enabled = clk_gate2_is_enabled,
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};
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struct clk *clk_gate2_alloc(const char *name, const char *parent,
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void __iomem *reg, u8 shift)
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{
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struct clk_gate2 *g = xzalloc(sizeof(*g));
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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_gate2_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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g->clk.flags = CLK_SET_RATE_PARENT;
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return &g->clk;
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}
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void clk_gate2_free(struct clk *clk)
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{
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struct clk_gate2 *g = to_clk_gate2(clk);
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free(g);
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}
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struct clk *clk_gate2(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 *g;
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int ret;
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g = clk_gate2_alloc(name , parent, reg, shift);
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ret = clk_register(g);
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if (ret) {
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free(to_clk_gate2(g));
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return ERR_PTR(ret);
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}
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return g;
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}
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struct clk *clk_gate2_inverted(const char *name, const char *parent,
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void __iomem *reg, u8 shift)
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{
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struct clk *clk;
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struct clk_gate2 *g;
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clk = clk_gate2(name, parent, reg, shift);
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if (IS_ERR(clk))
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return clk;
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g = to_clk_gate2(clk);
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g->flags = CLK_GATE_INVERTED;
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return clk;
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}
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