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/*
* Copyright (c) 2014 MediaTek Inc.
* Author: James Liao <jamesjj.liao@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/clkdev.h>
#include "clk-mtk.h"
#include "clk-gate.h"
/*
* clk_gate
*/
static void cg_set_mask(struct mtk_clk_gate *cg, u32 mask)
{
u32 r;
if (cg->flags & CLK_GATE_NO_SETCLR_REG) {
r = readl_relaxed(cg->sta_addr) | mask;
writel_relaxed(r, cg->sta_addr);
} else
writel_relaxed(mask, cg->set_addr);
}
static void cg_clr_mask(struct mtk_clk_gate *cg, u32 mask)
{
u32 r;
if (cg->flags & CLK_GATE_NO_SETCLR_REG) {
r = readl_relaxed(cg->sta_addr) & ~mask;
writel_relaxed(r, cg->sta_addr);
} else
writel_relaxed(mask, cg->clr_addr);
}
static int cg_enable(struct clk_hw *hw)
{
unsigned long flags = 0;
struct mtk_clk_gate *cg = to_clk_gate(hw);
u32 mask = BIT(cg->bit);
#ifdef Bring_Up
if (printk_ratelimit())
pr_notice("[CCF] %s: %s, bit: %u\n", __func__, __clk_get_name(hw->clk),
cg->bit);
return 0;
#endif
pr_debug("%s, bit: %u\n", __clk_get_name(hw->clk), cg->bit);
mtk_clk_lock(flags);
if (cg->flags & CLK_GATE_INVERSE)
cg_set_mask(cg, mask);
else
cg_clr_mask(cg, mask);
mtk_clk_unlock(flags);
return 0;
}
static void cg_disable(struct clk_hw *hw)
{
unsigned long flags = 0;
struct mtk_clk_gate *cg = to_clk_gate(hw);
u32 mask = BIT(cg->bit);
#ifdef Bring_Up
if (printk_ratelimit())
pr_notice("[CCF] %s: %s, bit: %u\n", __func__, __clk_get_name(hw->clk),
cg->bit);
return;
#endif
pr_debug("%s, bit: %u\n", __clk_get_name(hw->clk), cg->bit);
mtk_clk_lock(flags);
if (cg->flags & CLK_GATE_INVERSE)
cg_clr_mask(cg, mask);
else
cg_set_mask(cg, mask);
mtk_clk_unlock(flags);
}
static int cg_is_enabled(struct clk_hw *hw)
{
struct mtk_clk_gate *cg = to_clk_gate(hw);
u32 mask;
u32 val;
int r;
#ifdef Bring_Up
if (printk_ratelimit())
pr_notice("[CCF] %s: %s\n", __func__, __clk_get_name(hw->clk));
return 1;
#endif
mask = BIT(cg->bit);
val = mask & readl(cg->sta_addr);
r = (cg->flags & CLK_GATE_INVERSE) ? (val != 0) : (val == 0);
pr_debug("%d, %s, bit[%d]\n", r, __clk_get_name(hw->clk), (int)cg->bit);
return r;
}
static const struct clk_ops mtk_clk_gate_ops = {
.is_enabled = cg_is_enabled,
.enable = cg_enable,
.disable = cg_disable,
};
struct clk *mtk_clk_register_gate(
const char *name,
const char *parent_name,
void __iomem *set_addr,
void __iomem *clr_addr,
void __iomem *sta_addr,
u8 bit,
u32 flags)
{
struct mtk_clk_gate *cg;
struct clk *clk;
struct clk_init_data init;
#ifdef Bring_Up
pr_notice("[CCF] name: %s, bit: %d\n", name, (int)bit);
#else
pr_debug("name: %s, bit: %d\n", name, (int)bit);
#endif
cg = kzalloc(sizeof(*cg), GFP_KERNEL);
if (!cg)
return ERR_PTR(-ENOMEM);
init.name = name;
init.flags = CLK_IGNORE_UNUSED;
init.parent_names = parent_name ? &parent_name : NULL;
init.num_parents = parent_name ? 1 : 0;
init.ops = &mtk_clk_gate_ops;
cg->set_addr = set_addr;
cg->clr_addr = clr_addr;
cg->sta_addr = sta_addr;
cg->bit = bit;
cg->flags = flags;
cg->hw.init = &init;
clk = clk_register(NULL, &cg->hw);
if (IS_ERR(clk))
kfree(cg);
return clk;
}
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