drivers/clk/clk-fixed-factor.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019 DENX Software Engineering
   4  * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
   5  *
   6  * Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
   7  */
   8 #include <common.h>
   9 #include <malloc.h>
  10 #include <clk-uclass.h>
  11 #include <dm/device.h>
  12 #include <linux/clk-provider.h>
  13 #include <div64.h>
  14 #include <clk.h>
  15 #include "clk.h"
  16
  17 #define UBOOT_DM_CLK_IMX_FIXED_FACTOR "ccf_clk_fixed_factor"
  18
  19 static ulong clk_factor_recalc_rate(struct clk *clk)
  20 {
  21         struct clk_fixed_factor *fix =
  22                 to_clk_fixed_factor(dev_get_clk_ptr(clk->dev));
  23         unsigned long parent_rate = clk_get_parent_rate(clk);
  24         unsigned long long int rate;
  25
  26         rate = (unsigned long long int)parent_rate * fix->mult;
  27         do_div(rate, fix->div);
  28         return (ulong)rate;
  29 }
  30
  31 const struct clk_ops ccf_clk_fixed_factor_ops = {
  32         .get_rate = clk_factor_recalc_rate,
  33 };
  34
  35 struct clk *clk_hw_register_fixed_factor(struct device *dev,
  36                 const char *name, const char *parent_name, unsigned long flags,
  37                 unsigned int mult, unsigned int div)
  38 {
  39         struct clk_fixed_factor *fix;
  40         struct clk *clk;
  41         int ret;
  42
  43         fix = kzalloc(sizeof(*fix), GFP_KERNEL);
  44         if (!fix)
  45                 return ERR_PTR(-ENOMEM);
  46
  47         /* struct clk_fixed_factor assignments */
  48         fix->mult = mult;
  49         fix->div = div;
  50         clk = &fix->clk;
  51
  52         ret = clk_register(clk, UBOOT_DM_CLK_IMX_FIXED_FACTOR, name,
  53                            parent_name);
  54         if (ret) {
  55                 kfree(fix);
  56                 return ERR_PTR(ret);
  57         }
  58
  59         return clk;
  60 }
  61
  62 struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
  63                 const char *parent_name, unsigned long flags,
  64                 unsigned int mult, unsigned int div)
  65 {
  66         struct clk *clk;
  67
  68         clk = clk_hw_register_fixed_factor(dev, name, parent_name, flags, mult,
  69                                           div);
  70         if (IS_ERR(clk))
  71                 return ERR_CAST(clk);
  72         return clk;
  73 }
  74
  75 U_BOOT_DRIVER(imx_clk_fixed_factor) = {
  76         .name   = UBOOT_DM_CLK_IMX_FIXED_FACTOR,
  77         .id     = UCLASS_CLK,
  78         .ops    = &ccf_clk_fixed_factor_ops,
  79         .flags = DM_FLAG_PRE_RELOC,
  80 };