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99 lines
2.1 KiB
99 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015 MediaTek Inc. |
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* Author: James Liao <[email protected]> |
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*/ |
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#include <linux/delay.h> |
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#include <linux/of_address.h> |
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#include <linux/slab.h> |
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#include "clk-mtk.h" |
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#define REF2USB_TX_EN BIT(0) |
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#define REF2USB_TX_LPF_EN BIT(1) |
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#define REF2USB_TX_OUT_EN BIT(2) |
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#define REF2USB_EN_MASK (REF2USB_TX_EN | REF2USB_TX_LPF_EN | \ |
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REF2USB_TX_OUT_EN) |
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struct mtk_ref2usb_tx { |
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struct clk_hw hw; |
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void __iomem *base_addr; |
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}; |
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static inline struct mtk_ref2usb_tx *to_mtk_ref2usb_tx(struct clk_hw *hw) |
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{ |
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return container_of(hw, struct mtk_ref2usb_tx, hw); |
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} |
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static int mtk_ref2usb_tx_is_prepared(struct clk_hw *hw) |
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{ |
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struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw); |
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return (readl(tx->base_addr) & REF2USB_EN_MASK) == REF2USB_EN_MASK; |
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} |
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static int mtk_ref2usb_tx_prepare(struct clk_hw *hw) |
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{ |
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struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw); |
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u32 val; |
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val = readl(tx->base_addr); |
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val |= REF2USB_TX_EN; |
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writel(val, tx->base_addr); |
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udelay(100); |
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val |= REF2USB_TX_LPF_EN; |
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writel(val, tx->base_addr); |
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val |= REF2USB_TX_OUT_EN; |
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writel(val, tx->base_addr); |
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return 0; |
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} |
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static void mtk_ref2usb_tx_unprepare(struct clk_hw *hw) |
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{ |
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struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw); |
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u32 val; |
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val = readl(tx->base_addr); |
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val &= ~REF2USB_EN_MASK; |
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writel(val, tx->base_addr); |
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} |
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static const struct clk_ops mtk_ref2usb_tx_ops = { |
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.is_prepared = mtk_ref2usb_tx_is_prepared, |
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.prepare = mtk_ref2usb_tx_prepare, |
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.unprepare = mtk_ref2usb_tx_unprepare, |
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}; |
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struct clk * __init mtk_clk_register_ref2usb_tx(const char *name, |
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const char *parent_name, void __iomem *reg) |
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{ |
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struct mtk_ref2usb_tx *tx; |
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struct clk_init_data init = {}; |
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struct clk *clk; |
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tx = kzalloc(sizeof(*tx), GFP_KERNEL); |
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if (!tx) |
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return ERR_PTR(-ENOMEM); |
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tx->base_addr = reg; |
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tx->hw.init = &init; |
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init.name = name; |
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init.ops = &mtk_ref2usb_tx_ops; |
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init.parent_names = &parent_name; |
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init.num_parents = 1; |
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clk = clk_register(NULL, &tx->hw); |
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if (IS_ERR(clk)) { |
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pr_err("Failed to register clk %s: %ld\n", name, PTR_ERR(clk)); |
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kfree(tx); |
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} |
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return clk; |
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}
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