arch/arm/cpu/armv7/bcm281xx/clk-bsc.c

   1 /*
   2  * Copyright 2013 Broadcom Corporation.
   3  *
   4  * SPDX-License-Identifier:      GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <asm/errno.h>
  10 #include <asm/arch/sysmap.h>
  11 #include <asm/kona-common/clk.h>
  12 #include "clk-core.h"
  13
  14 /* Enable appropriate clocks for a BSC/I2C port */
  15 int clk_bsc_enable(void *base)
  16 {
  17         int ret;
  18         char *bscstr, *apbstr;
  19
  20         switch ((u32) base) {
  21         case PMU_BSC_BASE_ADDR:
  22                 /* PMU clock is always enabled */
  23                 return 0;
  24         case BSC1_BASE_ADDR:
  25                 bscstr = "bsc1_clk";
  26                 apbstr = "bsc1_apb_clk";
  27                 break;
  28         case BSC2_BASE_ADDR:
  29                 bscstr = "bsc2_clk";
  30                 apbstr = "bsc2_apb_clk";
  31                 break;
  32         case BSC3_BASE_ADDR:
  33                 bscstr = "bsc3_clk";
  34                 apbstr = "bsc3_apb_clk";
  35                 break;
  36         default:
  37                 printf("%s: base 0x%p not found\n", __func__, base);
  38                 return -EINVAL;
  39         }
  40
  41         /* Note that the bus clock must be enabled first */
  42
  43         ret = clk_get_and_enable(apbstr);
  44         if (ret)
  45                 return ret;
  46
  47         ret = clk_get_and_enable(bscstr);
  48         if (ret)
  49                 return ret;
  50
  51         return 0;
  52 }