kernel/drivers/clk/pistachio/clk.c

   1 /*
   2  * Copyright (C) 2014 Google, Inc.
   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
   9 #include <linux/clk.h>
  10 #include <linux/clk-provider.h>
  11 #include <linux/kernel.h>
  12 #include <linux/of.h>
  13 #include <linux/of_address.h>
  14 #include <linux/slab.h>
  15
  16 #include "clk.h"
  17
  18 struct pistachio_clk_provider *
  19 pistachio_clk_alloc_provider(struct device_node *node, unsigned int num_clks)
  20 {
  21         struct pistachio_clk_provider *p;
  22
  23         p = kzalloc(sizeof(*p), GFP_KERNEL);
  24         if (!p)
  25                 return p;
  26
  27         p->clk_data.clks = kcalloc(num_clks, sizeof(struct clk *), GFP_KERNEL);
  28         if (!p->clk_data.clks)
  29                 goto free_provider;
  30         p->clk_data.clk_num = num_clks;
  31         p->node = node;
  32         p->base = of_iomap(node, 0);
  33         if (!p->base) {
  34                 pr_err("Failed to map clock provider registers\n");
  35                 goto free_clks;
  36         }
  37
  38         return p;
  39
  40 free_clks:
  41         kfree(p->clk_data.clks);
  42 free_provider:
  43         kfree(p);
  44         return NULL;
  45 }
  46
  47 void pistachio_clk_register_provider(struct pistachio_clk_provider *p)
  48 {
  49         unsigned int i;
  50
  51         for (i = 0; i < p->clk_data.clk_num; i++) {
  52                 if (IS_ERR(p->clk_data.clks[i]))
  53                         pr_warn("Failed to register clock %d: %ld\n", i,
  54                                 PTR_ERR(p->clk_data.clks[i]));
  55         }
  56
  57         of_clk_add_provider(p->node, of_clk_src_onecell_get, &p->clk_data);
  58 }
  59
  60 void pistachio_clk_register_gate(struct pistachio_clk_provider *p,
  61                                  struct pistachio_gate *gate,
  62                                  unsigned int num)
  63 {
  64         struct clk *clk;
  65         unsigned int i;
  66
  67         for (i = 0; i < num; i++) {
  68                 clk = clk_register_gate(NULL, gate[i].name, gate[i].parent,
  69                                         CLK_SET_RATE_PARENT,
  70                                         p->base + gate[i].reg, gate[i].shift,
  71                                         0, NULL);
  72                 p->clk_data.clks[gate[i].id] = clk;
  73         }
  74 }
  75
  76 void pistachio_clk_register_mux(struct pistachio_clk_provider *p,
  77                                 struct pistachio_mux *mux,
  78                                 unsigned int num)
  79 {
  80         struct clk *clk;
  81         unsigned int i;
  82
  83         for (i = 0; i < num; i++) {
  84                 clk = clk_register_mux(NULL, mux[i].name, mux[i].parents,
  85                                        mux[i].num_parents,
  86                                        CLK_SET_RATE_NO_REPARENT,
  87                                        p->base + mux[i].reg, mux[i].shift,
  88                                        get_count_order(mux[i].num_parents),
  89                                        0, NULL);
  90                 p->clk_data.clks[mux[i].id] = clk;
  91         }
  92 }
  93
  94 void pistachio_clk_register_div(struct pistachio_clk_provider *p,
  95                                 struct pistachio_div *div,
  96                                 unsigned int num)
  97 {
  98         struct clk *clk;
  99         unsigned int i;
 100
 101         for (i = 0; i < num; i++) {
 102                 clk = clk_register_divider(NULL, div[i].name, div[i].parent,
 103                                            0, p->base + div[i].reg, 0,
 104                                            div[i].width, div[i].div_flags,
 105                                            NULL);
 106                 p->clk_data.clks[div[i].id] = clk;
 107         }
 108 }
 109
 110 void pistachio_clk_register_fixed_factor(struct pistachio_clk_provider *p,
 111                                          struct pistachio_fixed_factor *ff,
 112                                          unsigned int num)
 113 {
 114         struct clk *clk;
 115         unsigned int i;
 116
 117         for (i = 0; i < num; i++) {
 118                 clk = clk_register_fixed_factor(NULL, ff[i].name, ff[i].parent,
 119                                                 0, 1, ff[i].div);
 120                 p->clk_data.clks[ff[i].id] = clk;
 121         }
 122 }
 123
 124 void pistachio_clk_force_enable(struct pistachio_clk_provider *p,
 125                                 unsigned int *clk_ids, unsigned int num)
 126 {
 127         unsigned int i;
 128         int err;
 129
 130         for (i = 0; i < num; i++) {
 131                 struct clk *clk = p->clk_data.clks[clk_ids[i]];
 132
 133                 if (IS_ERR(clk))
 134                         continue;
 135
 136                 err = clk_prepare_enable(clk);
 137                 if (err)
 138                         pr_err("Failed to enable clock %s: %d\n",
 139                                __clk_get_name(clk), err);
 140         }
 141 }