linux/drivers/clk/versatile/clk-versatile.c
<<
>>
Prefs
   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 */
  21static void __iomem *cm_base;
  22
  23static 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
  34static 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
  40static 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
  51static 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};
  56static 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
  86static void __init of_integrator_cm_osc_setup(struct device_node *np)
  87{
  88        cm_osc_setup(np, &cm_auxosc_desc);
  89}
  90CLK_OF_DECLARE(integrator_cm_auxosc_clk,
  91        "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
  92
  93static void __init of_versatile_cm_osc_setup(struct device_node *np)
  94{
  95        cm_osc_setup(np, &versatile_auxosc_desc);
  96}
  97CLK_OF_DECLARE(versatile_cm_auxosc_clk,
  98               "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);
  99