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 <wait_bit.h>
   8 #include <asm/io.h>
   9 #include <asm/arch/clock_manager.h>
  10
  11 DECLARE_GLOBAL_DATA_PTR;
  12
  13 static const struct socfpga_clock_manager *clock_manager_base =
  14         (struct socfpga_clock_manager *)SOCFPGA_CLKMGR_ADDRESS;
  15
  16 void cm_wait_for_lock(u32 mask)
  17 {
  18         u32 inter_val;
  19         u32 retry = 0;
  20         do {
  21 #if defined(CONFIG_TARGET_SOCFPGA_GEN5)
  22                 inter_val = readl(&clock_manager_base->inter) & mask;
  23 #else
  24                 inter_val = readl(&clock_manager_base->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(&clock_manager_base->stat,
  40                                  CLKMGR_STAT_BUSY, false, 20000, false);
  41 }
  42
  43 int set_cpu_clk_info(void)
  44 {
  45 #if defined(CONFIG_TARGET_SOCFPGA_GEN5)
  46         /* Calculate the clock frequencies required for drivers */
  47         cm_get_l4_sp_clk_hz();
  48         cm_get_mmc_controller_clk_hz();
  49 #endif
  50
  51         gd->bd->bi_arm_freq = cm_get_mpu_clk_hz() / 1000000;
  52         gd->bd->bi_dsp_freq = 0;
  53
  54 #if defined(CONFIG_TARGET_SOCFPGA_GEN5)
  55         gd->bd->bi_ddr_freq = cm_get_sdram_clk_hz() / 1000000;
  56 #else
  57         gd->bd->bi_ddr_freq = 0;
  58 #endif
  59
  60         return 0;
  61 }
  62
  63 #ifndef CONFIG_SPL_BUILD
  64 static int do_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  65 {
  66         cm_print_clock_quick_summary();
  67         return 0;
  68 }
  69
  70 U_BOOT_CMD(
  71         clocks, CONFIG_SYS_MAXARGS, 1, do_showclocks,
  72         "display clocks",
  73         ""
  74 );
  75 #endif