drivers/clk/versatile/clk-versatile.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
   4  * Versatile PB boards.
   5  * Copyright (C) 2012 Linus Walleij
   6  */
   7 #include <linux/clk-provider.h>
   8 #include <linux/err.h>
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11
  12 #include "icst.h"
  13 #include "clk-icst.h"
  14
  15 #define INTEGRATOR_HDR_LOCK_OFFSET      0x14
  16
  17 #define VERSATILE_SYS_OSCCLCD_OFFSET    0x1c
  18 #define VERSATILE_SYS_LOCK_OFFSET       0x20
  19
  20 /* Base offset for the core module */
  21 static void __iomem *cm_base;
  22
  23 static const struct icst_params cp_auxosc_params = {
  24         .vco_max        = ICST525_VCO_MAX_5V,
  25         .vco_min        = ICST525_VCO_MIN,
  26         .vd_min         = 8,
  27         .vd_max         = 263,
  28         .rd_min         = 3,
  29         .rd_max         = 65,
  30         .s2div          = icst525_s2div,
  31         .idx2s          = icst525_idx2s,
  32 };
  33
  34 static const struct clk_icst_desc cm_auxosc_desc __initconst = {
  35         .params = &cp_auxosc_params,
  36         .vco_offset = 0x1c,
  37         .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
  38 };
  39
  40 static const struct icst_params versatile_auxosc_params = {
  41         .vco_max        = ICST307_VCO_MAX,
  42         .vco_min        = ICST307_VCO_MIN,
  43         .vd_min         = 4 + 8,
  44         .vd_max         = 511 + 8,
  45         .rd_min         = 1 + 2,
  46         .rd_max         = 127 + 2,
  47         .s2div          = icst307_s2div,
  48         .idx2s          = icst307_idx2s,
  49 };
  50
  51 static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
  52         .params = &versatile_auxosc_params,
  53         .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
  54         .lock_offset = VERSATILE_SYS_LOCK_OFFSET,
  55 };
  56 static void __init cm_osc_setup(struct device_node *np,
  57                                 const struct clk_icst_desc *desc)
  58 {
  59         struct clk *clk;
  60         const char *clk_name = np->name;
  61         const char *parent_name;
  62
  63         if (!cm_base) {
  64                 /* Remap the core module base if not done yet */
  65                 struct device_node *parent;
  66
  67                 parent = of_get_parent(np);
  68                 if (!parent) {
  69                         pr_err("no parent on core module clock\n");
  70                         return;
  71                 }
  72                 cm_base = of_iomap(parent, 0);
  73                 of_node_put(parent);
  74                 if (!cm_base) {
  75                         pr_err("could not remap core module base\n");
  76                         return;
  77                 }
  78         }
  79
  80         parent_name = of_clk_get_parent_name(np, 0);
  81         clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
  82         if (!IS_ERR(clk))
  83                 of_clk_add_provider(np, of_clk_src_simple_get, clk);
  84 }
  85
  86 static void __init of_integrator_cm_osc_setup(struct device_node *np)
  87 {
  88         cm_osc_setup(np, &cm_auxosc_desc);
  89 }
  90 CLK_OF_DECLARE(integrator_cm_auxosc_clk,
  91         "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
  92
  93 static void __init of_versatile_cm_osc_setup(struct device_node *np)
  94 {
  95         cm_osc_setup(np, &versatile_auxosc_desc);
  96 }
  97 CLK_OF_DECLARE(versatile_cm_auxosc_clk,
  98                "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);