drivers/clk/imx/clk-pllv3.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
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <malloc.h>
  10 #include <clk-uclass.h>
  11 #include <dm/device.h>
  12 #include <dm/uclass.h>
  13 #include <clk.h>
  14 #include "clk.h"
  15
  16 #define UBOOT_DM_CLK_IMX_PLLV3 "imx_clk_pllv3"
  17
  18 struct clk_pllv3 {
  19         struct clk      clk;
  20         void __iomem    *base;
  21         u32             div_mask;
  22         u32             div_shift;
  23 };
  24
  25 #define to_clk_pllv3(_clk) container_of(_clk, struct clk_pllv3, clk)
  26
  27 static ulong clk_pllv3_get_rate(struct clk *clk)
  28 {
  29         struct clk_pllv3 *pll = to_clk_pllv3(dev_get_clk_ptr(clk->dev));
  30         unsigned long parent_rate = clk_get_parent_rate(clk);
  31
  32         u32 div = (readl(pll->base) >> pll->div_shift) & pll->div_mask;
  33
  34         return (div == 1) ? parent_rate * 22 : parent_rate * 20;
  35 }
  36
  37 static const struct clk_ops clk_pllv3_generic_ops = {
  38         .get_rate       = clk_pllv3_get_rate,
  39 };
  40
  41 struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
  42                           const char *parent_name, void __iomem *base,
  43                           u32 div_mask)
  44 {
  45         struct clk_pllv3 *pll;
  46         struct clk *clk;
  47         char *drv_name;
  48         int ret;
  49
  50         pll = kzalloc(sizeof(*pll), GFP_KERNEL);
  51         if (!pll)
  52                 return ERR_PTR(-ENOMEM);
  53
  54         switch (type) {
  55         case IMX_PLLV3_GENERIC:
  56         case IMX_PLLV3_USB:
  57                 drv_name = UBOOT_DM_CLK_IMX_PLLV3;
  58                 break;
  59         default:
  60                 kfree(pll);
  61                 return ERR_PTR(-ENOTSUPP);
  62         }
  63
  64         pll->base = base;
  65         pll->div_mask = div_mask;
  66         clk = &pll->clk;
  67
  68         ret = clk_register(clk, drv_name, name, parent_name);
  69         if (ret) {
  70                 kfree(pll);
  71                 return ERR_PTR(ret);
  72         }
  73
  74         return clk;
  75 }
  76
  77 U_BOOT_DRIVER(clk_pllv3_generic) = {
  78         .name   = UBOOT_DM_CLK_IMX_PLLV3,
  79         .id     = UCLASS_CLK,
  80         .ops    = &clk_pllv3_generic_ops,
  81         .flags = DM_FLAG_PRE_RELOC,
  82 };