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732374a0b4
Add new functions "sifive_prci_clock_enable(), sifive_prci_clock_disable() and sifive_clk_is_enabled()" to enable or disable the PRCI clock Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com> Tested-by: Zong Li <zong.li@sifive.com> Link: https://lore.kernel.org/r/20201209094916.17383-6-zong.li@sifive.com Signed-off-by: Stephen Boyd <sboyd@kernel.org>
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018-2019 SiFive, Inc.
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* Copyright (C) 2018-2019 Wesley Terpstra
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* Copyright (C) 2018-2019 Paul Walmsley
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* Copyright (C) 2020 Zong Li
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*
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* The FU540 PRCI implements clock and reset control for the SiFive
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* FU540-C000 chip. This driver assumes that it has sole control
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* over all PRCI resources.
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*
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* This driver is based on the PRCI driver written by Wesley Terpstra:
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* https://github.com/riscv/riscv-linux/commit/999529edf517ed75b56659d456d221b2ee56bb60
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*
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* References:
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* - SiFive FU540-C000 manual v1p0, Chapter 7 "Clocking and Reset"
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*/
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#include <linux/module.h>
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#include <dt-bindings/clock/sifive-fu540-prci.h>
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#include "fu540-prci.h"
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#include "sifive-prci.h"
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/* PRCI integration data for each WRPLL instance */
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static struct __prci_wrpll_data __prci_corepll_data = {
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.cfg0_offs = PRCI_COREPLLCFG0_OFFSET,
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.cfg1_offs = PRCI_COREPLLCFG1_OFFSET,
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.enable_bypass = sifive_prci_coreclksel_use_hfclk,
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.disable_bypass = sifive_prci_coreclksel_use_corepll,
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};
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static struct __prci_wrpll_data __prci_ddrpll_data = {
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.cfg0_offs = PRCI_DDRPLLCFG0_OFFSET,
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.cfg1_offs = PRCI_DDRPLLCFG1_OFFSET,
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};
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static struct __prci_wrpll_data __prci_gemgxlpll_data = {
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.cfg0_offs = PRCI_GEMGXLPLLCFG0_OFFSET,
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.cfg1_offs = PRCI_GEMGXLPLLCFG1_OFFSET,
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};
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/* Linux clock framework integration */
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static const struct clk_ops sifive_fu540_prci_wrpll_clk_ops = {
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.set_rate = sifive_prci_wrpll_set_rate,
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.round_rate = sifive_prci_wrpll_round_rate,
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.recalc_rate = sifive_prci_wrpll_recalc_rate,
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.enable = sifive_prci_clock_enable,
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.disable = sifive_prci_clock_disable,
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.is_enabled = sifive_clk_is_enabled,
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};
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static const struct clk_ops sifive_fu540_prci_wrpll_ro_clk_ops = {
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.recalc_rate = sifive_prci_wrpll_recalc_rate,
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};
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static const struct clk_ops sifive_fu540_prci_tlclksel_clk_ops = {
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.recalc_rate = sifive_prci_tlclksel_recalc_rate,
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};
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/* List of clock controls provided by the PRCI */
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struct __prci_clock __prci_init_clocks_fu540[] = {
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[PRCI_CLK_COREPLL] = {
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.name = "corepll",
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.parent_name = "hfclk",
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.ops = &sifive_fu540_prci_wrpll_clk_ops,
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.pwd = &__prci_corepll_data,
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},
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[PRCI_CLK_DDRPLL] = {
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.name = "ddrpll",
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.parent_name = "hfclk",
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.ops = &sifive_fu540_prci_wrpll_ro_clk_ops,
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.pwd = &__prci_ddrpll_data,
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},
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[PRCI_CLK_GEMGXLPLL] = {
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.name = "gemgxlpll",
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.parent_name = "hfclk",
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.ops = &sifive_fu540_prci_wrpll_clk_ops,
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.pwd = &__prci_gemgxlpll_data,
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},
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[PRCI_CLK_TLCLK] = {
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.name = "tlclk",
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.parent_name = "corepll",
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.ops = &sifive_fu540_prci_tlclksel_clk_ops,
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},
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};
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