drivers/clk/versatile/clk-versatile.c

   1 /*
   2  * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
   3  * Versatile PB boards.
   4  * Copyright (C) 2012 Linus Walleij
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/clk-provider.h>
  11 #include <linux/err.h>
  12 #include <linux/of.h>
  13 #include <linux/of_address.h>
  14
  15 #include "clk-icst.h"
  16
  17 #define INTEGRATOR_HDR_LOCK_OFFSET      0x14
  18
  19 #define VERSATILE_SYS_OSCCLCD_OFFSET    0x1c
  20 #define VERSATILE_SYS_LOCK_OFFSET       0x20
  21
  22 /* Base offset for the core module */
  23 static void __iomem *cm_base;
  24
  25 static const struct icst_params cp_auxosc_params = {
  26         .vco_max        = ICST525_VCO_MAX_5V,
  27         .vco_min        = ICST525_VCO_MIN,
  28         .vd_min         = 8,
  29         .vd_max         = 263,
  30         .rd_min         = 3,
  31         .rd_max         = 65,
  32         .s2div          = icst525_s2div,
  33         .idx2s          = icst525_idx2s,
  34 };
  35
  36 static const struct clk_icst_desc __initdata cm_auxosc_desc = {
  37         .params = &cp_auxosc_params,
  38         .vco_offset = 0x1c,
  39         .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
  40 };
  41
  42 static const struct icst_params versatile_auxosc_params = {
  43         .vco_max        = ICST307_VCO_MAX,
  44         .vco_min        = ICST307_VCO_MIN,
  45         .vd_min         = 4 + 8,
  46         .vd_max         = 511 + 8,
  47         .rd_min         = 1 + 2,
  48         .rd_max         = 127 + 2,
  49         .s2div          = icst307_s2div,
  50         .idx2s          = icst307_idx2s,
  51 };
  52
  53 static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
  54         .params = &versatile_auxosc_params,
  55         .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
  56         .lock_offset = VERSATILE_SYS_LOCK_OFFSET,
  57 };
  58 static void __init cm_osc_setup(struct device_node *np,
  59                                 const struct clk_icst_desc *desc)
  60 {
  61         struct clk *clk = ERR_PTR(-EINVAL);
  62         const char *clk_name = np->name;
  63         const char *parent_name;
  64
  65         if (!cm_base) {
  66                 /* Remap the core module base if not done yet */
  67                 struct device_node *parent;
  68
  69                 parent = of_get_parent(np);
  70                 if (!parent) {
  71                         pr_err("no parent on core module clock\n");
  72                         return;
  73                 }
  74                 cm_base = of_iomap(parent, 0);
  75                 if (!cm_base) {
  76                         pr_err("could not remap core module base\n");
  77                         return;
  78                 }
  79         }
  80
  81         parent_name = of_clk_get_parent_name(np, 0);
  82         clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
  83         if (!IS_ERR(clk))
  84                 of_clk_add_provider(np, of_clk_src_simple_get, clk);
  85 }
  86
  87 static void __init of_integrator_cm_osc_setup(struct device_node *np)
  88 {
  89         cm_osc_setup(np, &cm_auxosc_desc);
  90 }
  91 CLK_OF_DECLARE(integrator_cm_auxosc_clk,
  92         "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
  93
  94 static void __init of_versatile_cm_osc_setup(struct device_node *np)
  95 {
  96         cm_osc_setup(np, &versatile_auxosc_desc);
  97 }
  98 CLK_OF_DECLARE(versatile_cm_auxosc_clk,
  99                "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);