drivers/clk/sunxi-ng/ccu_common.c

   1 /*
   2  * Copyright 2016 Maxime Ripard
   3  *
   4  * Maxime Ripard <maxime.ripard@free-electrons.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk-provider.h>
  18 #include <linux/iopoll.h>
  19 #include <linux/slab.h>
  20
  21 #include "ccu_common.h"
  22 #include "ccu_reset.h"
  23
  24 static DEFINE_SPINLOCK(ccu_lock);
  25
  26 void ccu_helper_wait_for_lock(struct ccu_common *common, u32 lock)
  27 {
  28         u32 reg;
  29
  30         if (!lock)
  31                 return;
  32
  33         WARN_ON(readl_relaxed_poll_timeout(common->base + common->reg, reg,
  34                                            reg & lock, 100, 70000));
  35 }
  36
  37 int sunxi_ccu_probe(struct device_node *node, void __iomem *reg,
  38                     const struct sunxi_ccu_desc *desc)
  39 {
  40         struct ccu_reset *reset;
  41         int i, ret;
  42
  43         for (i = 0; i < desc->num_ccu_clks; i++) {
  44                 struct ccu_common *cclk = desc->ccu_clks[i];
  45
  46                 if (!cclk)
  47                         continue;
  48
  49                 cclk->base = reg;
  50                 cclk->lock = &ccu_lock;
  51         }
  52
  53         for (i = 0; i < desc->hw_clks->num ; i++) {
  54                 struct clk_hw *hw = desc->hw_clks->hws[i];
  55
  56                 if (!hw)
  57                         continue;
  58
  59                 ret = clk_hw_register(NULL, hw);
  60                 if (ret) {
  61                         pr_err("Couldn't register clock %s\n",
  62                                clk_hw_get_name(hw));
  63                         goto err_clk_unreg;
  64                 }
  65         }
  66
  67         ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get,
  68                                      desc->hw_clks);
  69         if (ret)
  70                 goto err_clk_unreg;
  71
  72         reset = kzalloc(sizeof(*reset), GFP_KERNEL);
  73         reset->rcdev.of_node = node;
  74         reset->rcdev.ops = &ccu_reset_ops;
  75         reset->rcdev.owner = THIS_MODULE;
  76         reset->rcdev.nr_resets = desc->num_resets;
  77         reset->base = reg;
  78         reset->lock = &ccu_lock;
  79         reset->reset_map = desc->resets;
  80
  81         ret = reset_controller_register(&reset->rcdev);
  82         if (ret)
  83                 goto err_of_clk_unreg;
  84
  85         return 0;
  86
  87 err_of_clk_unreg:
  88 err_clk_unreg:
  89         return ret;
  90 }