kernel/drivers/clk/tegra/clk-tegra-pmc.c

   1 /*
   2  * Copyright (c) 2012, 2013, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/io.h>
  18 #include <linux/clk.h>
  19 #include <linux/clk-provider.h>
  20 #include <linux/clkdev.h>
  21 #include <linux/of.h>
  22 #include <linux/of_address.h>
  23 #include <linux/delay.h>
  24 #include <linux/export.h>
  25 #include <linux/clk/tegra.h>
  26
  27 #include "clk.h"
  28 #include "clk-id.h"
  29
  30 #define PMC_CLK_OUT_CNTRL 0x1a8
  31 #define PMC_DPD_PADS_ORIDE 0x1c
  32 #define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
  33 #define PMC_CTRL 0
  34 #define PMC_CTRL_BLINK_ENB 7
  35 #define PMC_BLINK_TIMER 0x40
  36
  37 struct pmc_clk_init_data {
  38         char *mux_name;
  39         char *gate_name;
  40         const char **parents;
  41         int num_parents;
  42         int mux_id;
  43         int gate_id;
  44         char *dev_name;
  45         u8 mux_shift;
  46         u8 gate_shift;
  47 };
  48
  49 #define PMC_CLK(_num, _mux_shift, _gate_shift)\
  50         {\
  51                 .mux_name = "clk_out_" #_num "_mux",\
  52                 .gate_name = "clk_out_" #_num,\
  53                 .parents = clk_out ##_num ##_parents,\
  54                 .num_parents = ARRAY_SIZE(clk_out ##_num ##_parents),\
  55                 .mux_id = tegra_clk_clk_out_ ##_num ##_mux,\
  56                 .gate_id = tegra_clk_clk_out_ ##_num,\
  57                 .dev_name = "extern" #_num,\
  58                 .mux_shift = _mux_shift,\
  59                 .gate_shift = _gate_shift,\
  60         }
  61
  62 static DEFINE_SPINLOCK(clk_out_lock);
  63
  64 static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2",
  65         "clk_m_div4", "extern1",
  66 };
  67
  68 static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2",
  69         "clk_m_div4", "extern2",
  70 };
  71
  72 static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2",
  73         "clk_m_div4", "extern3",
  74 };
  75
  76 static struct pmc_clk_init_data pmc_clks[] = {
  77         PMC_CLK(1, 6, 2),
  78         PMC_CLK(2, 14, 10),
  79         PMC_CLK(3, 22, 18),
  80 };
  81
  82 void __init tegra_pmc_clk_init(void __iomem *pmc_base,
  83                                 struct tegra_clk *tegra_clks)
  84 {
  85         struct clk *clk;
  86         struct clk **dt_clk;
  87         int i;
  88
  89         for (i = 0; i < ARRAY_SIZE(pmc_clks); i++) {
  90                 struct pmc_clk_init_data *data;
  91
  92                 data = pmc_clks + i;
  93
  94                 dt_clk = tegra_lookup_dt_id(data->mux_id, tegra_clks);
  95                 if (!dt_clk)
  96                         continue;
  97
  98                 clk = clk_register_mux(NULL, data->mux_name, data->parents,
  99                                 data->num_parents, CLK_SET_RATE_NO_REPARENT,
 100                                 pmc_base + PMC_CLK_OUT_CNTRL, data->mux_shift,
 101                                 3, 0, &clk_out_lock);
 102                 *dt_clk = clk;
 103
 104
 105                 dt_clk = tegra_lookup_dt_id(data->gate_id, tegra_clks);
 106                 if (!dt_clk)
 107                         continue;
 108
 109                 clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
 110                                         0, pmc_base + PMC_CLK_OUT_CNTRL,
 111                                         data->gate_shift, 0, &clk_out_lock);
 112                 *dt_clk = clk;
 113                 clk_register_clkdev(clk, data->dev_name, data->gate_name);
 114         }
 115
 116         /* blink */
 117         writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
 118         clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
 119                                 pmc_base + PMC_DPD_PADS_ORIDE,
 120                                 PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);
 121
 122         dt_clk = tegra_lookup_dt_id(tegra_clk_blink, tegra_clks);
 123         if (!dt_clk)
 124                 return;
 125
 126         clk = clk_register_gate(NULL, "blink", "blink_override", 0,
 127                                 pmc_base + PMC_CTRL,
 128                                 PMC_CTRL_BLINK_ENB, 0, NULL);
 129         clk_register_clkdev(clk, "blink", NULL);
 130         *dt_clk = clk;
 131 }
 132