213 lines
5.4 KiB
C
213 lines
5.4 KiB
C
/*
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* Copyright (C) 2013-2014 Lucas Stach <l.stach@pengutronix.de>
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*
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* Based on the Linux Tegra clock code
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <common.h>
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#include <io.h>
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#include <malloc.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include "clk.h"
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#define to_clk_periph(_hw) container_of(_hw, struct tegra_clk_periph, hw)
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static int clk_periph_get_parent(struct clk *hw)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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return periph->mux->ops->get_parent(periph->mux);
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}
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static int clk_periph_set_parent(struct clk *hw, u8 index)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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return periph->mux->ops->set_parent(periph->mux, index);
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}
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static unsigned long clk_periph_recalc_rate(struct clk *hw,
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unsigned long parent_rate)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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return periph->div->ops->recalc_rate(periph->div, parent_rate);
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}
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static long clk_periph_round_rate(struct clk *hw, unsigned long rate,
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unsigned long *prate)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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return periph->div->ops->round_rate(periph->div, rate, prate);
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}
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static int clk_periph_set_rate(struct clk *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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return periph->div->ops->set_rate(periph->div, rate, parent_rate);
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}
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static int clk_periph_is_enabled(struct clk *hw)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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return periph->gate->ops->is_enabled(periph->gate);
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}
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static int clk_periph_enable(struct clk *hw)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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u32 reg;
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reg = readl(periph->rst_reg);
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reg |= (1 << periph->rst_shift);
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writel(reg, periph->rst_reg);
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periph->gate->ops->enable(periph->gate);
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udelay(2);
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reg = readl(periph->rst_reg);
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reg &= ~(1 << periph->rst_shift);
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writel(reg, periph->rst_reg);
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return 0;
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}
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static void clk_periph_disable(struct clk *hw)
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{
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struct tegra_clk_periph *periph = to_clk_periph(hw);
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u32 reg;
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reg = readl(periph->rst_reg);
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reg |= (1 << periph->rst_shift);
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writel(reg, periph->rst_reg);
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udelay(2);
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periph->gate->ops->disable(periph->gate);
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}
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const struct clk_ops tegra_clk_periph_ops = {
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.get_parent = clk_periph_get_parent,
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.set_parent = clk_periph_set_parent,
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.recalc_rate = clk_periph_recalc_rate,
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.round_rate = clk_periph_round_rate,
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.set_rate = clk_periph_set_rate,
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.is_enabled = clk_periph_is_enabled,
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.enable = clk_periph_enable,
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.disable = clk_periph_disable,
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};
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const struct clk_ops tegra_clk_periph_nodiv_ops = {
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.get_parent = clk_periph_get_parent,
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.set_parent = clk_periph_set_parent,
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.is_enabled = clk_periph_is_enabled,
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.enable = clk_periph_enable,
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.disable = clk_periph_disable,
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};
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struct clk *_tegra_clk_register_periph(const char *name,
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const char **parent_names, int num_parents,
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void __iomem *clk_base, u32 reg_offset, u8 id, u8 flags,
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bool has_div)
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{
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struct tegra_clk_periph *periph;
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int ret, gate_offs, rst_offs;
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periph = kzalloc(sizeof(*periph), GFP_KERNEL);
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if (!periph) {
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pr_err("%s: could not allocate peripheral clk\n",
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__func__);
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goto out_periph;
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}
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periph->mux = clk_mux_alloc(NULL, clk_base + reg_offset, 30, 2,
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parent_names, num_parents, 0);
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if (!periph->mux)
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goto out_mux;
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if (id >= 96)
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gate_offs = 0x360 + (((id - 96) >> 3) & 0xc);
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else
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gate_offs = 0x10 + ((id >> 3) & 0xc);
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periph->gate = clk_gate_alloc(NULL, NULL, clk_base + gate_offs,
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id & 0x1f, 0, 0);
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if (!periph->gate)
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goto out_gate;
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if (has_div) {
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periph->div = tegra_clk_divider_alloc(NULL, NULL, clk_base +
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reg_offset, 0, TEGRA_DIVIDER_ROUND_UP, 0, 8, 1);
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if (!periph->div)
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goto out_div;
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}
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periph->hw.name = name;
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periph->hw.ops = has_div ? &tegra_clk_periph_ops :
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&tegra_clk_periph_nodiv_ops;
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periph->hw.parent_names = parent_names;
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periph->hw.num_parents = num_parents;
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periph->flags = flags;
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if (id >= 96)
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rst_offs = 0x358 + (((id - 96) >> 3) & 0xc);
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else
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rst_offs = 0x4 + ((id >> 3) & 0xc);
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periph->rst_reg = clk_base + rst_offs;
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periph->rst_shift = id & 0x1f;
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ret = clk_register(&periph->hw);
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if (ret)
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goto out_register;
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return &periph->hw;
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out_register:
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tegra_clk_divider_free(periph->div);
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out_div:
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clk_gate_free(periph->gate);
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out_gate:
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clk_mux_free(periph->mux);
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out_mux:
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kfree(periph);
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out_periph:
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return NULL;
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}
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struct clk *tegra_clk_register_periph_nodiv(const char *name,
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const char **parent_names, int num_parents,
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void __iomem *clk_base, u32 reg_offset, u8 id, u8 flags)
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{
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return _tegra_clk_register_periph(name, parent_names, num_parents,
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clk_base, reg_offset, id, flags,
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false);
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}
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struct clk *tegra_clk_register_periph(const char *name,
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const char **parent_names, int num_parents,
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void __iomem *clk_base, u32 reg_offset, u8 id, u8 flags)
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{
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return _tegra_clk_register_periph(name, parent_names, num_parents,
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clk_base, reg_offset, id, flags,
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true);
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}
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