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a63b6186f9
Given that externx can only be used as a parent for clk_out_x, it makes sense to propagate requests to make clk_out_x easier to handle. Signed-off-by: Alex Frid <afrid@nvidia.com> Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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* Copyright (c) 2012, 2013, NVIDIA CORPORATION. All rights reserved.
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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 <linux/io.h>
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/clk/tegra.h>
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#include "clk.h"
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#include "clk-id.h"
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#define PMC_CLK_OUT_CNTRL 0x1a8
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#define PMC_DPD_PADS_ORIDE 0x1c
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#define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
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#define PMC_CTRL 0
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#define PMC_CTRL_BLINK_ENB 7
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#define PMC_BLINK_TIMER 0x40
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struct pmc_clk_init_data {
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char *mux_name;
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char *gate_name;
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const char **parents;
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int num_parents;
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int mux_id;
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int gate_id;
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char *dev_name;
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u8 mux_shift;
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u8 gate_shift;
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};
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#define PMC_CLK(_num, _mux_shift, _gate_shift)\
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{\
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.mux_name = "clk_out_" #_num "_mux",\
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.gate_name = "clk_out_" #_num,\
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.parents = clk_out ##_num ##_parents,\
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.num_parents = ARRAY_SIZE(clk_out ##_num ##_parents),\
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.mux_id = tegra_clk_clk_out_ ##_num ##_mux,\
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.gate_id = tegra_clk_clk_out_ ##_num,\
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.dev_name = "extern" #_num,\
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.mux_shift = _mux_shift,\
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.gate_shift = _gate_shift,\
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}
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static DEFINE_SPINLOCK(clk_out_lock);
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static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2",
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"clk_m_div4", "extern1",
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};
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static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2",
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"clk_m_div4", "extern2",
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};
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static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2",
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"clk_m_div4", "extern3",
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};
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static struct pmc_clk_init_data pmc_clks[] = {
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PMC_CLK(1, 6, 2),
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PMC_CLK(2, 14, 10),
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PMC_CLK(3, 22, 18),
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};
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void __init tegra_pmc_clk_init(void __iomem *pmc_base,
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struct tegra_clk *tegra_clks)
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{
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struct clk *clk;
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struct clk **dt_clk;
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int i;
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for (i = 0; i < ARRAY_SIZE(pmc_clks); i++) {
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struct pmc_clk_init_data *data;
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data = pmc_clks + i;
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dt_clk = tegra_lookup_dt_id(data->mux_id, tegra_clks);
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if (!dt_clk)
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continue;
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clk = clk_register_mux(NULL, data->mux_name, data->parents,
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data->num_parents,
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CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT,
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pmc_base + PMC_CLK_OUT_CNTRL, data->mux_shift,
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3, 0, &clk_out_lock);
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*dt_clk = clk;
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dt_clk = tegra_lookup_dt_id(data->gate_id, tegra_clks);
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if (!dt_clk)
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continue;
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clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
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CLK_SET_RATE_PARENT,
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pmc_base + PMC_CLK_OUT_CNTRL,
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data->gate_shift, 0, &clk_out_lock);
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*dt_clk = clk;
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clk_register_clkdev(clk, data->dev_name, data->gate_name);
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}
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/* blink */
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writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
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clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
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pmc_base + PMC_DPD_PADS_ORIDE,
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PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);
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dt_clk = tegra_lookup_dt_id(tegra_clk_blink, tegra_clks);
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if (!dt_clk)
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return;
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clk = clk_register_gate(NULL, "blink", "blink_override", 0,
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pmc_base + PMC_CTRL,
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PMC_CTRL_BLINK_ENB, 0, NULL);
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clk_register_clkdev(clk, "blink", NULL);
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*dt_clk = clk;
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}
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