269 lines
6.4 KiB
C
269 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2018 NVIDIA CORPORATION. All rights reserved.
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*
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* based on clk-mux.c
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*
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* Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
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* Copyright (C) 2011 Richard Zhao, Linaro <richard.zhao@linaro.org>
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* Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
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*
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*/
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#include <linux/clk-provider.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/types.h>
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#include "clk.h"
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#define DIV_MASK GENMASK(7, 0)
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#define MUX_SHIFT 29
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#define MUX_MASK GENMASK(MUX_SHIFT + 2, MUX_SHIFT)
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#define SDMMC_MUL 2
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#define get_max_div(d) DIV_MASK
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#define get_div_field(val) ((val) & DIV_MASK)
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#define get_mux_field(val) (((val) & MUX_MASK) >> MUX_SHIFT)
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static const char * const mux_sdmmc_parents[] = {
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"pll_p", "pll_c4_out2", "pll_c4_out0", "pll_c4_out1", "clk_m"
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};
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static const u8 mux_lj_idx[] = {
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[0] = 0, [1] = 1, [2] = 2, [3] = 5, [4] = 6
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};
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static const u8 mux_non_lj_idx[] = {
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[0] = 0, [1] = 3, [2] = 7, [3] = 4, [4] = 6
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};
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static u8 clk_sdmmc_mux_get_parent(struct clk_hw *hw)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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int num_parents, i;
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u32 src, val;
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const u8 *mux_idx;
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num_parents = clk_hw_get_num_parents(hw);
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val = readl_relaxed(sdmmc_mux->reg);
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src = get_mux_field(val);
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if (get_div_field(val))
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mux_idx = mux_non_lj_idx;
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else
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mux_idx = mux_lj_idx;
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for (i = 0; i < num_parents; i++) {
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if (mux_idx[i] == src)
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return i;
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}
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WARN(1, "Unknown parent selector %d\n", src);
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return 0;
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}
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static int clk_sdmmc_mux_set_parent(struct clk_hw *hw, u8 index)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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u32 val;
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val = readl_relaxed(sdmmc_mux->reg);
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if (get_div_field(val))
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index = mux_non_lj_idx[index];
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else
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index = mux_lj_idx[index];
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val &= ~MUX_MASK;
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val |= index << MUX_SHIFT;
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writel(val, sdmmc_mux->reg);
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return 0;
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}
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static unsigned long clk_sdmmc_mux_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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u32 val;
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int div;
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u64 rate = parent_rate;
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val = readl_relaxed(sdmmc_mux->reg);
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div = get_div_field(val);
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div += SDMMC_MUL;
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rate *= SDMMC_MUL;
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rate += div - 1;
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do_div(rate, div);
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return rate;
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}
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static int clk_sdmmc_mux_determine_rate(struct clk_hw *hw,
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struct clk_rate_request *req)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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int div;
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unsigned long output_rate = req->best_parent_rate;
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req->rate = max(req->rate, req->min_rate);
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req->rate = min(req->rate, req->max_rate);
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if (!req->rate)
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return output_rate;
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div = div_frac_get(req->rate, output_rate, 8, 1, sdmmc_mux->div_flags);
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if (div < 0)
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div = 0;
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if (sdmmc_mux->div_flags & TEGRA_DIVIDER_ROUND_UP)
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req->rate = DIV_ROUND_UP(output_rate * SDMMC_MUL,
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div + SDMMC_MUL);
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else
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req->rate = output_rate * SDMMC_MUL / (div + SDMMC_MUL);
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return 0;
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}
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static int clk_sdmmc_mux_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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int div;
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unsigned long flags = 0;
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u32 val;
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u8 src;
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div = div_frac_get(rate, parent_rate, 8, 1, sdmmc_mux->div_flags);
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if (div < 0)
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return div;
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if (sdmmc_mux->lock)
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spin_lock_irqsave(sdmmc_mux->lock, flags);
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src = clk_sdmmc_mux_get_parent(hw);
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if (div)
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src = mux_non_lj_idx[src];
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else
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src = mux_lj_idx[src];
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val = src << MUX_SHIFT;
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val |= div;
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writel(val, sdmmc_mux->reg);
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fence_udelay(2, sdmmc_mux->reg);
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if (sdmmc_mux->lock)
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spin_unlock_irqrestore(sdmmc_mux->lock, flags);
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return 0;
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}
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static int clk_sdmmc_mux_is_enabled(struct clk_hw *hw)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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const struct clk_ops *gate_ops = sdmmc_mux->gate_ops;
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struct clk_hw *gate_hw = &sdmmc_mux->gate.hw;
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__clk_hw_set_clk(gate_hw, hw);
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return gate_ops->is_enabled(gate_hw);
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}
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static int clk_sdmmc_mux_enable(struct clk_hw *hw)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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const struct clk_ops *gate_ops = sdmmc_mux->gate_ops;
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struct clk_hw *gate_hw = &sdmmc_mux->gate.hw;
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__clk_hw_set_clk(gate_hw, hw);
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return gate_ops->enable(gate_hw);
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}
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static void clk_sdmmc_mux_disable(struct clk_hw *hw)
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{
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struct tegra_sdmmc_mux *sdmmc_mux = to_clk_sdmmc_mux(hw);
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const struct clk_ops *gate_ops = sdmmc_mux->gate_ops;
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struct clk_hw *gate_hw = &sdmmc_mux->gate.hw;
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gate_ops->disable(gate_hw);
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}
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static void clk_sdmmc_mux_restore_context(struct clk_hw *hw)
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{
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struct clk_hw *parent = clk_hw_get_parent(hw);
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unsigned long parent_rate = clk_hw_get_rate(parent);
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unsigned long rate = clk_hw_get_rate(hw);
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int parent_id;
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parent_id = clk_hw_get_parent_index(hw);
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if (WARN_ON(parent_id < 0))
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return;
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clk_sdmmc_mux_set_parent(hw, parent_id);
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clk_sdmmc_mux_set_rate(hw, rate, parent_rate);
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}
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static const struct clk_ops tegra_clk_sdmmc_mux_ops = {
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.get_parent = clk_sdmmc_mux_get_parent,
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.set_parent = clk_sdmmc_mux_set_parent,
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.determine_rate = clk_sdmmc_mux_determine_rate,
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.recalc_rate = clk_sdmmc_mux_recalc_rate,
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.set_rate = clk_sdmmc_mux_set_rate,
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.is_enabled = clk_sdmmc_mux_is_enabled,
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.enable = clk_sdmmc_mux_enable,
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.disable = clk_sdmmc_mux_disable,
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.restore_context = clk_sdmmc_mux_restore_context,
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};
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struct clk *tegra_clk_register_sdmmc_mux_div(const char *name,
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void __iomem *clk_base, u32 offset, u32 clk_num, u8 div_flags,
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unsigned long flags, void *lock)
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{
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struct clk *clk;
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struct clk_init_data init;
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const struct tegra_clk_periph_regs *bank;
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struct tegra_sdmmc_mux *sdmmc_mux;
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init.ops = &tegra_clk_sdmmc_mux_ops;
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init.name = name;
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init.flags = flags;
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init.parent_names = mux_sdmmc_parents;
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init.num_parents = ARRAY_SIZE(mux_sdmmc_parents);
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bank = get_reg_bank(clk_num);
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if (!bank)
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return ERR_PTR(-EINVAL);
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sdmmc_mux = kzalloc(sizeof(*sdmmc_mux), GFP_KERNEL);
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if (!sdmmc_mux)
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return ERR_PTR(-ENOMEM);
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/* Data in .init is copied by clk_register(), so stack variable OK */
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sdmmc_mux->hw.init = &init;
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sdmmc_mux->reg = clk_base + offset;
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sdmmc_mux->lock = lock;
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sdmmc_mux->gate.clk_base = clk_base;
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sdmmc_mux->gate.regs = bank;
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sdmmc_mux->gate.enable_refcnt = periph_clk_enb_refcnt;
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sdmmc_mux->gate.clk_num = clk_num;
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sdmmc_mux->gate.flags = TEGRA_PERIPH_ON_APB;
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sdmmc_mux->div_flags = div_flags;
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sdmmc_mux->gate_ops = &tegra_clk_periph_gate_ops;
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clk = clk_register(NULL, &sdmmc_mux->hw);
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if (IS_ERR(clk)) {
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kfree(sdmmc_mux);
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return clk;
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}
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sdmmc_mux->gate.hw.clk = clk;
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return clk;
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}
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