113 lines
2.3 KiB
C
113 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2015 MediaTek Inc.
|
|
* Author: James Liao <jamesjj.liao@mediatek.com>
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "clk-mtk.h"
|
|
|
|
#define REF2USB_TX_EN BIT(0)
|
|
#define REF2USB_TX_LPF_EN BIT(1)
|
|
#define REF2USB_TX_OUT_EN BIT(2)
|
|
#define REF2USB_EN_MASK (REF2USB_TX_EN | REF2USB_TX_LPF_EN | \
|
|
REF2USB_TX_OUT_EN)
|
|
|
|
struct mtk_ref2usb_tx {
|
|
struct clk_hw hw;
|
|
void __iomem *base_addr;
|
|
};
|
|
|
|
static inline struct mtk_ref2usb_tx *to_mtk_ref2usb_tx(struct clk_hw *hw)
|
|
{
|
|
return container_of(hw, struct mtk_ref2usb_tx, hw);
|
|
}
|
|
|
|
static int mtk_ref2usb_tx_is_prepared(struct clk_hw *hw)
|
|
{
|
|
struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
|
|
|
|
return (readl(tx->base_addr) & REF2USB_EN_MASK) == REF2USB_EN_MASK;
|
|
}
|
|
|
|
static int mtk_ref2usb_tx_prepare(struct clk_hw *hw)
|
|
{
|
|
struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
|
|
u32 val;
|
|
|
|
val = readl(tx->base_addr);
|
|
|
|
val |= REF2USB_TX_EN;
|
|
writel(val, tx->base_addr);
|
|
udelay(100);
|
|
|
|
val |= REF2USB_TX_LPF_EN;
|
|
writel(val, tx->base_addr);
|
|
|
|
val |= REF2USB_TX_OUT_EN;
|
|
writel(val, tx->base_addr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mtk_ref2usb_tx_unprepare(struct clk_hw *hw)
|
|
{
|
|
struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
|
|
u32 val;
|
|
|
|
val = readl(tx->base_addr);
|
|
val &= ~REF2USB_EN_MASK;
|
|
writel(val, tx->base_addr);
|
|
}
|
|
|
|
static const struct clk_ops mtk_ref2usb_tx_ops = {
|
|
.is_prepared = mtk_ref2usb_tx_is_prepared,
|
|
.prepare = mtk_ref2usb_tx_prepare,
|
|
.unprepare = mtk_ref2usb_tx_unprepare,
|
|
};
|
|
|
|
struct clk_hw *mtk_clk_register_ref2usb_tx(const char *name,
|
|
const char *parent_name, void __iomem *reg)
|
|
{
|
|
struct mtk_ref2usb_tx *tx;
|
|
struct clk_init_data init = {};
|
|
int ret;
|
|
|
|
tx = kzalloc(sizeof(*tx), GFP_KERNEL);
|
|
if (!tx)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
tx->base_addr = reg;
|
|
tx->hw.init = &init;
|
|
|
|
init.name = name;
|
|
init.ops = &mtk_ref2usb_tx_ops;
|
|
init.parent_names = &parent_name;
|
|
init.num_parents = 1;
|
|
|
|
ret = clk_hw_register(NULL, &tx->hw);
|
|
|
|
if (ret) {
|
|
kfree(tx);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return &tx->hw;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtk_clk_register_ref2usb_tx);
|
|
|
|
void mtk_clk_unregister_ref2usb_tx(struct clk_hw *hw)
|
|
{
|
|
struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
|
|
|
|
clk_hw_unregister(hw);
|
|
kfree(tx);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtk_clk_unregister_ref2usb_tx);
|
|
|
|
MODULE_LICENSE("GPL");
|