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