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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2012, 2013, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #include <linux/io.h>
   7 #include <linux/clk-provider.h>
   8 #include <linux/clkdev.h>
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11 #include <linux/delay.h>
  12 #include <linux/export.h>
  13 #include <linux/clk/tegra.h>
  14
  15 #include "clk.h"
  16 #include "clk-id.h"
  17
  18 #define PMC_CLK_OUT_CNTRL 0x1a8
  19 #define PMC_DPD_PADS_ORIDE 0x1c
  20 #define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
  21 #define PMC_CTRL 0
  22 #define PMC_CTRL_BLINK_ENB 7
  23 #define PMC_BLINK_TIMER 0x40
  24
  25 struct pmc_clk_init_data {
  26         char *mux_name;
  27         char *gate_name;
  28         const char **parents;
  29         int num_parents;
  30         int mux_id;
  31         int gate_id;
  32         char *dev_name;
  33         u8 mux_shift;
  34         u8 gate_shift;
  35 };
  36
  37 #define PMC_CLK(_num, _mux_shift, _gate_shift)\
  38         {\
  39                 .mux_name = "clk_out_" #_num "_mux",\
  40                 .gate_name = "clk_out_" #_num,\
  41                 .parents = clk_out ##_num ##_parents,\
  42                 .num_parents = ARRAY_SIZE(clk_out ##_num ##_parents),\
  43                 .mux_id = tegra_clk_clk_out_ ##_num ##_mux,\
  44                 .gate_id = tegra_clk_clk_out_ ##_num,\
  45                 .dev_name = "extern" #_num,\
  46                 .mux_shift = _mux_shift,\
  47                 .gate_shift = _gate_shift,\
  48         }
  49
  50 static DEFINE_SPINLOCK(clk_out_lock);
  51
  52 static const char *clk_out1_parents[] = { "clk_m", "clk_m_div2",
  53         "clk_m_div4", "extern1",
  54 };
  55
  56 static const char *clk_out2_parents[] = { "clk_m", "clk_m_div2",
  57         "clk_m_div4", "extern2",
  58 };
  59
  60 static const char *clk_out3_parents[] = { "clk_m", "clk_m_div2",
  61         "clk_m_div4", "extern3",
  62 };
  63
  64 static struct pmc_clk_init_data pmc_clks[] = {
  65         PMC_CLK(1, 6, 2),
  66         PMC_CLK(2, 14, 10),
  67         PMC_CLK(3, 22, 18),
  68 };
  69
  70 void __init tegra_pmc_clk_init(void __iomem *pmc_base,
  71                                 struct tegra_clk *tegra_clks)
  72 {
  73         struct clk *clk;
  74         struct clk **dt_clk;
  75         int i;
  76
  77         for (i = 0; i < ARRAY_SIZE(pmc_clks); i++) {
  78                 struct pmc_clk_init_data *data;
  79
  80                 data = pmc_clks + i;
  81
  82                 dt_clk = tegra_lookup_dt_id(data->mux_id, tegra_clks);
  83                 if (!dt_clk)
  84                         continue;
  85
  86                 clk = clk_register_mux(NULL, data->mux_name, data->parents,
  87                                 data->num_parents,
  88                                 CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT,
  89                                 pmc_base + PMC_CLK_OUT_CNTRL, data->mux_shift,
  90                                 3, 0, &clk_out_lock);
  91                 *dt_clk = clk;
  92
  93
  94                 dt_clk = tegra_lookup_dt_id(data->gate_id, tegra_clks);
  95                 if (!dt_clk)
  96                         continue;
  97
  98                 clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
  99                                         CLK_SET_RATE_PARENT,
 100                                         pmc_base + PMC_CLK_OUT_CNTRL,
 101                                         data->gate_shift, 0, &clk_out_lock);
 102                 *dt_clk = clk;
 103                 clk_register_clkdev(clk, data->dev_name, data->gate_name);
 104         }
 105
 106         /* blink */
 107         writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
 108         clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
 109                                 pmc_base + PMC_DPD_PADS_ORIDE,
 110                                 PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);
 111
 112         dt_clk = tegra_lookup_dt_id(tegra_clk_blink, tegra_clks);
 113         if (!dt_clk)
 114                 return;
 115
 116         clk = clk_register_gate(NULL, "blink", "blink_override", 0,
 117                                 pmc_base + PMC_CTRL,
 118                                 PMC_CTRL_BLINK_ENB, 0, NULL);
 119         clk_register_clkdev(clk, "blink", NULL);
 120         *dt_clk = clk;
 121 }
 122