arch/arm/mach-socfpga/clock_manager.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  Copyright (C) 2013-2017 Altera Corporation <www.altera.com>
   4  */
   5
   6 #include <common.h>
   7 #include <init.h>
   8 #include <wait_bit.h>
   9 #include <asm/io.h>
  10 #include <asm/arch/clock_manager.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 void cm_wait_for_lock(u32 mask)
  15 {
  16         u32 inter_val;
  17         u32 retry = 0;
  18         do {
  19 #if defined(CONFIG_TARGET_SOCFPGA_GEN5)
  20                 inter_val = readl(socfpga_get_clkmgr_addr() +
  21                                   CLKMGR_INTER) & mask;
  22 #else
  23                 inter_val = readl(socfpga_get_clkmgr_addr() +
  24                                   CLKMGR_STAT) & mask;
  25 #endif
  26                 /* Wait for stable lock */
  27                 if (inter_val == mask)
  28                         retry++;
  29                 else
  30                         retry = 0;
  31                 if (retry >= 10)
  32                         break;
  33         } while (1);
  34 }
  35
  36 /* function to poll in the fsm busy bit */
  37 int cm_wait_for_fsm(void)
  38 {
  39         return wait_for_bit_le32((const void *)(socfpga_get_clkmgr_addr() +
  40                                  CLKMGR_STAT), CLKMGR_STAT_BUSY, false, 20000,
  41                                  false);
  42 }
  43
  44 int set_cpu_clk_info(void)
  45 {
  46 #if defined(CONFIG_TARGET_SOCFPGA_GEN5)
  47         /* Calculate the clock frequencies required for drivers */
  48         cm_get_l4_sp_clk_hz();
  49         cm_get_mmc_controller_clk_hz();
  50 #endif
  51
  52         gd->bd->bi_arm_freq = cm_get_mpu_clk_hz() / 1000000;
  53         gd->bd->bi_dsp_freq = 0;
  54
  55 #if defined(CONFIG_TARGET_SOCFPGA_GEN5)
  56         gd->bd->bi_ddr_freq = cm_get_sdram_clk_hz() / 1000000;
  57 #else
  58         gd->bd->bi_ddr_freq = 0;
  59 #endif
  60
  61         return 0;
  62 }
  63
  64 #ifndef CONFIG_SPL_BUILD
  65 static int do_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  66 {
  67         cm_print_clock_quick_summary();
  68         return 0;
  69 }
  70
  71 U_BOOT_CMD(
  72         clocks, CONFIG_SYS_MAXARGS, 1, do_showclocks,
  73         "display clocks",
  74         ""
  75 );
  76 #endif