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 "icst.h"
  16 #include "clk-icst.h"
  17
  18 #define INTEGRATOR_HDR_LOCK_OFFSET      0x14
  19
  20 #define VERSATILE_SYS_OSCCLCD_OFFSET    0x1c
  21 #define VERSATILE_SYS_LOCK_OFFSET       0x20
  22
  23 /* Base offset for the core module */
  24 static void __iomem *cm_base;
  25
  26 static const struct icst_params cp_auxosc_params = {
  27         .vco_max        = ICST525_VCO_MAX_5V,
  28         .vco_min        = ICST525_VCO_MIN,
  29         .vd_min         = 8,
  30         .vd_max         = 263,
  31         .rd_min         = 3,
  32         .rd_max         = 65,
  33         .s2div          = icst525_s2div,
  34         .idx2s          = icst525_idx2s,
  35 };
  36
  37 static const struct clk_icst_desc cm_auxosc_desc __initconst = {
  38         .params = &cp_auxosc_params,
  39         .vco_offset = 0x1c,
  40         .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
  41 };
  42
  43 static const struct icst_params versatile_auxosc_params = {
  44         .vco_max        = ICST307_VCO_MAX,
  45         .vco_min        = ICST307_VCO_MIN,
  46         .vd_min         = 4 + 8,
  47         .vd_max         = 511 + 8,
  48         .rd_min         = 1 + 2,
  49         .rd_max         = 127 + 2,
  50         .s2div          = icst307_s2div,
  51         .idx2s          = icst307_idx2s,
  52 };
  53
  54 static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
  55         .params = &versatile_auxosc_params,
  56         .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
  57         .lock_offset = VERSATILE_SYS_LOCK_OFFSET,
  58 };
  59 static void __init cm_osc_setup(struct device_node *np,
  60                                 const struct clk_icst_desc *desc)
  61 {
  62         struct clk *clk = ERR_PTR(-EINVAL);
  63         const char *clk_name = np->name;
  64         const char *parent_name;
  65
  66         if (!cm_base) {
  67                 /* Remap the core module base if not done yet */
  68                 struct device_node *parent;
  69
  70                 parent = of_get_parent(np);
  71                 if (!parent) {
  72                         pr_err("no parent on core module clock\n");
  73                         return;
  74                 }
  75                 cm_base = of_iomap(parent, 0);
  76                 if (!cm_base) {
  77                         pr_err("could not remap core module base\n");
  78                         return;
  79                 }
  80         }
  81
  82         parent_name = of_clk_get_parent_name(np, 0);
  83         clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
  84         if (!IS_ERR(clk))
  85                 of_clk_add_provider(np, of_clk_src_simple_get, clk);
  86 }
  87
  88 static void __init of_integrator_cm_osc_setup(struct device_node *np)
  89 {
  90         cm_osc_setup(np, &cm_auxosc_desc);
  91 }
  92 CLK_OF_DECLARE(integrator_cm_auxosc_clk,
  93         "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
  94
  95 static void __init of_versatile_cm_osc_setup(struct device_node *np)
  96 {
  97         cm_osc_setup(np, &versatile_auxosc_desc);
  98 }
  99 CLK_OF_DECLARE(versatile_cm_auxosc_clk,
 100                "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);