mirror of
https://github.com/smaeul/u-boot.git
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d2e82ad9e0
Add shared counter in order to avoid to swich off clock that are already used. Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com> Reviewed-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 DENX Software Engineering
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* Lukasz Majewski, DENX Software Engineering, lukma@denx.de
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*
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* Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com>
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* Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Gated clock implementation
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*
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <malloc.h>
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#include <clk-uclass.h>
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#include <dm/device.h>
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#include <dm/devres.h>
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#include <linux/bug.h>
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#include <linux/clk-provider.h>
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#include <clk.h>
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#include "clk.h"
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#include <linux/err.h>
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#define UBOOT_DM_CLK_IMX_GATE2 "imx_clk_gate2"
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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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u8 bit_idx;
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u8 cgr_val;
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u8 flags;
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unsigned int *share_count;
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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 *gate = to_clk_gate2(clk);
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u32 reg;
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if (gate->share_count && (*gate->share_count)++ > 0)
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return 0;
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reg = readl(gate->reg);
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reg &= ~(3 << gate->bit_idx);
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reg |= gate->cgr_val << gate->bit_idx;
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writel(reg, gate->reg);
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return 0;
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}
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static int clk_gate2_disable(struct clk *clk)
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{
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struct clk_gate2 *gate = to_clk_gate2(clk);
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u32 reg;
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if (gate->share_count) {
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if (WARN_ON(*gate->share_count == 0))
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return 0;
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else if (--(*gate->share_count) > 0)
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return 0;
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}
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reg = readl(gate->reg);
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reg &= ~(3 << gate->bit_idx);
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writel(reg, gate->reg);
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return 0;
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}
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static ulong clk_gate2_set_rate(struct clk *clk, ulong rate)
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{
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struct clk *parent = clk_get_parent(clk);
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if (parent)
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return clk_set_rate(parent, rate);
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return -ENODEV;
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}
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static const struct clk_ops clk_gate2_ops = {
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.set_rate = clk_gate2_set_rate,
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.enable = clk_gate2_enable,
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.disable = clk_gate2_disable,
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.get_rate = clk_generic_get_rate,
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};
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struct clk *clk_register_gate2(struct device *dev, const char *name,
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const char *parent_name, unsigned long flags,
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void __iomem *reg, u8 bit_idx, u8 cgr_val,
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u8 clk_gate2_flags, unsigned int *share_count)
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{
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struct clk_gate2 *gate;
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struct clk *clk;
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int ret;
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gate = kzalloc(sizeof(*gate), GFP_KERNEL);
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if (!gate)
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return ERR_PTR(-ENOMEM);
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gate->reg = reg;
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gate->bit_idx = bit_idx;
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gate->cgr_val = cgr_val;
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gate->flags = clk_gate2_flags;
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gate->share_count = share_count;
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clk = &gate->clk;
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ret = clk_register(clk, UBOOT_DM_CLK_IMX_GATE2, name, parent_name);
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if (ret) {
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kfree(gate);
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return ERR_PTR(ret);
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}
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return clk;
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}
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U_BOOT_DRIVER(clk_gate2) = {
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.name = UBOOT_DM_CLK_IMX_GATE2,
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.id = UCLASS_CLK,
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.ops = &clk_gate2_ops,
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.flags = DM_FLAG_PRE_RELOC,
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};
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