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-provider.h>
  19 #include <linux/clkdev.h>
  20 #include <linux/of.h>
  21 #include <linux/of_address.h>
  22 #include <linux/delay.h>
  23 #include <linux/export.h>
  24 #include <linux/clk/tegra.h>
  25
  26 #include "clk.h"
  27 #include "clk-id.h"
  28
  29 #define PMC_CLK_OUT_CNTRL 0x1a8
  30 #define PMC_DPD_PADS_ORIDE 0x1c
  31 #define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
  32 #define PMC_CTRL 0
  33 #define PMC_CTRL_BLINK_ENB 7
  34 #define PMC_BLINK_TIMER 0x40
  35
  36 struct pmc_clk_init_data {
  37         char *mux_name;
  38         char *gate_name;
  39         const char **parents;
  40         int num_parents;
  41         int mux_id;
  42         int gate_id;
  43         char *dev_name;
  44         u8 mux_shift;
  45         u8 gate_shift;
  46 };
  47
  48 #define PMC_CLK(_num, _mux_shift, _gate_shift)\
  49         {\
  50                 .mux_name = "clk_out_" #_num "_mux",\
  51                 .gate_name = "clk_out_" #_num,\
  52                 .parents = clk_out ##_num ##_parents,\
  53                 .num_parents = ARRAY_SIZE(clk_out ##_num ##_parents),\
  54                 .mux_id = tegra_clk_clk_out_ ##_num ##_mux,\
  55                 .gate_id = tegra_clk_clk_out_ ##_num,\
  56                 .dev_name = "extern" #_num,\
  57                 .mux_shift = _mux_shift,\
  58                 .gate_shift = _gate_shift,\
  59         }
  60
  61 static DEFINE_SPINLOCK(clk_out_lock);
  62
  63 static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2",
  64         "clk_m_div4", "extern1",
  65 };
  66
  67 static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2",
  68         "clk_m_div4", "extern2",
  69 };
  70
  71 static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2",
  72         "clk_m_div4", "extern3",
  73 };
  74
  75 static struct pmc_clk_init_data pmc_clks[] = {
  76         PMC_CLK(1, 6, 2),
  77         PMC_CLK(2, 14, 10),
  78         PMC_CLK(3, 22, 18),
  79 };
  80
  81 void __init tegra_pmc_clk_init(void __iomem *pmc_base,
  82                                 struct tegra_clk *tegra_clks)
  83 {
  84         struct clk *clk;
  85         struct clk **dt_clk;
  86         int i;
  87
  88         for (i = 0; i < ARRAY_SIZE(pmc_clks); i++) {
  89                 struct pmc_clk_init_data *data;
  90
  91                 data = pmc_clks + i;
  92
  93                 dt_clk = tegra_lookup_dt_id(data->mux_id, tegra_clks);
  94                 if (!dt_clk)
  95                         continue;
  96
  97                 clk = clk_register_mux(NULL, data->mux_name, data->parents,
  98                                 data->num_parents, CLK_SET_RATE_NO_REPARENT,
  99                                 pmc_base + PMC_CLK_OUT_CNTRL, data->mux_shift,
 100                                 3, 0, &clk_out_lock);
 101                 *dt_clk = clk;
 102
 103
 104                 dt_clk = tegra_lookup_dt_id(data->gate_id, tegra_clks);
 105                 if (!dt_clk)
 106                         continue;
 107
 108                 clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
 109                                         0, pmc_base + PMC_CLK_OUT_CNTRL,
 110                                         data->gate_shift, 0, &clk_out_lock);
 111                 *dt_clk = clk;
 112                 clk_register_clkdev(clk, data->dev_name, data->gate_name);
 113         }
 114
 115         /* blink */
 116         writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
 117         clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
 118                                 pmc_base + PMC_DPD_PADS_ORIDE,
 119                                 PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);
 120
 121         dt_clk = tegra_lookup_dt_id(tegra_clk_blink, tegra_clks);
 122         if (!dt_clk)
 123                 return;
 124
 125         clk = clk_register_gate(NULL, "blink", "blink_override", 0,
 126                                 pmc_base + PMC_CTRL,
 127                                 PMC_CTRL_BLINK_ENB, 0, NULL);
 128         clk_register_clkdev(clk, "blink", NULL);
 129         *dt_clk = clk;
 130 }
 131