drivers/clk/versatile/clk-integrator.c

   1 /*
   2  * Clock driver for the ARM Integrator/AP and Integrator/CP boards
   3  * Copyright (C) 2012 Linus Walleij
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/clk-provider.h>
  10 #include <linux/clk.h>
  11 #include <linux/clkdev.h>
  12 #include <linux/err.h>
  13 #include <linux/platform_data/clk-integrator.h>
  14
  15 #include <mach/hardware.h>
  16 #include <mach/platform.h>
  17
  18 #include "clk-icst.h"
  19
  20 /*
  21  * Implementation of the ARM Integrator/AP and Integrator/CP clock tree.
  22  * Inspired by portions of:
  23  * plat-versatile/clock.c and plat-versatile/include/plat/clock.h
  24  */
  25
  26 static const struct icst_params cp_auxvco_params = {
  27         .ref            = 24000000,
  28         .vco_max        = ICST525_VCO_MAX_5V,
  29         .vco_min        = ICST525_VCO_MIN,
  30         .vd_min         = 8,
  31         .vd_max         = 263,
  32         .rd_min         = 3,
  33         .rd_max         = 65,
  34         .s2div          = icst525_s2div,
  35         .idx2s          = icst525_idx2s,
  36 };
  37
  38 static const struct clk_icst_desc __initdata cp_icst_desc = {
  39         .params = &cp_auxvco_params,
  40         .vco_offset = 0x1c,
  41         .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
  42 };
  43
  44 /*
  45  * integrator_clk_init() - set up the integrator clock tree
  46  * @is_cp: pass true if it's the Integrator/CP else AP is assumed
  47  */
  48 void __init integrator_clk_init(bool is_cp)
  49 {
  50         struct clk *clk;
  51
  52         /* APB clock dummy */
  53         clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
  54         clk_register_clkdev(clk, "apb_pclk", NULL);
  55
  56         /* UART reference clock */
  57         clk = clk_register_fixed_rate(NULL, "uartclk", NULL, CLK_IS_ROOT,
  58                                 14745600);
  59         clk_register_clkdev(clk, NULL, "uart0");
  60         clk_register_clkdev(clk, NULL, "uart1");
  61         if (is_cp)
  62                 clk_register_clkdev(clk, NULL, "mmci");
  63
  64         /* 24 MHz clock */
  65         clk = clk_register_fixed_rate(NULL, "clk24mhz", NULL, CLK_IS_ROOT,
  66                                 24000000);
  67         clk_register_clkdev(clk, NULL, "kmi0");
  68         clk_register_clkdev(clk, NULL, "kmi1");
  69         if (!is_cp)
  70                 clk_register_clkdev(clk, NULL, "ap_timer");
  71
  72         if (!is_cp)
  73                 return;
  74
  75         /* 1 MHz clock */
  76         clk = clk_register_fixed_rate(NULL, "clk1mhz", NULL, CLK_IS_ROOT,
  77                                 1000000);
  78         clk_register_clkdev(clk, NULL, "sp804");
  79
  80         /* ICST VCO clock used on the Integrator/CP CLCD */
  81         clk = icst_clk_register(NULL, &cp_icst_desc,
  82                                 __io_address(INTEGRATOR_HDR_BASE));
  83         clk_register_clkdev(clk, NULL, "clcd");
  84 }