drivers/clk/socfpga/clk.c

   1 /*
   2  *  Copyright (C) 2012 Altera Corporation <www.altera.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #include <linux/clk.h>
  18 #include <linux/clkdev.h>
  19 #include <linux/clk-provider.h>
  20
  21 #define SOCFPGA_OSC1_CLK        10000000
  22 #define SOCFPGA_MPU_CLK         800000000
  23 #define SOCFPGA_MAIN_QSPI_CLK           432000000
  24 #define SOCFPGA_MAIN_NAND_SDMMC_CLK     250000000
  25 #define SOCFPGA_S2F_USR_CLK             125000000
  26
  27 void __init socfpga_init_clocks(void)
  28 {
  29         struct clk *clk;
  30
  31         clk = clk_register_fixed_rate(NULL, "osc1_clk", NULL, CLK_IS_ROOT, SOCFPGA_OSC1_CLK);
  32         clk_register_clkdev(clk, "osc1_clk", NULL);
  33
  34         clk = clk_register_fixed_rate(NULL, "mpu_clk", NULL, CLK_IS_ROOT, SOCFPGA_MPU_CLK);
  35         clk_register_clkdev(clk, "mpu_clk", NULL);
  36
  37         clk = clk_register_fixed_rate(NULL, "main_clk", NULL, CLK_IS_ROOT, SOCFPGA_MPU_CLK/2);
  38         clk_register_clkdev(clk, "main_clk", NULL);
  39
  40         clk = clk_register_fixed_rate(NULL, "dbg_base_clk", NULL, CLK_IS_ROOT, SOCFPGA_MPU_CLK/2);
  41         clk_register_clkdev(clk, "dbg_base_clk", NULL);
  42
  43         clk = clk_register_fixed_rate(NULL, "main_qspi_clk", NULL, CLK_IS_ROOT, SOCFPGA_MAIN_QSPI_CLK);
  44         clk_register_clkdev(clk, "main_qspi_clk", NULL);
  45
  46         clk = clk_register_fixed_rate(NULL, "main_nand_sdmmc_clk", NULL, CLK_IS_ROOT, SOCFPGA_MAIN_NAND_SDMMC_CLK);
  47         clk_register_clkdev(clk, "main_nand_sdmmc_clk", NULL);
  48
  49         clk = clk_register_fixed_rate(NULL, "s2f_usr_clk", NULL, CLK_IS_ROOT, SOCFPGA_S2F_USR_CLK);
  50         clk_register_clkdev(clk, "s2f_usr_clk", NULL);
  51 }