100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
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/*
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* Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
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* Versatile PB boards.
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* Copyright (C) 2012 Linus Walleij
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk-provider.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include "clk-icst.h"
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#define INTEGRATOR_HDR_LOCK_OFFSET 0x14
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#define VERSATILE_SYS_OSCCLCD_OFFSET 0x1c
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#define VERSATILE_SYS_LOCK_OFFSET 0x20
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/* Base offset for the core module */
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static void __iomem *cm_base;
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static const struct icst_params cp_auxosc_params = {
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.vco_max = ICST525_VCO_MAX_5V,
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.vco_min = ICST525_VCO_MIN,
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.vd_min = 8,
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.vd_max = 263,
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.rd_min = 3,
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.rd_max = 65,
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.s2div = icst525_s2div,
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.idx2s = icst525_idx2s,
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};
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static const struct clk_icst_desc cm_auxosc_desc __initconst = {
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.params = &cp_auxosc_params,
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.vco_offset = 0x1c,
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.lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
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};
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static const struct icst_params versatile_auxosc_params = {
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.vco_max = ICST307_VCO_MAX,
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.vco_min = ICST307_VCO_MIN,
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.vd_min = 4 + 8,
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.vd_max = 511 + 8,
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.rd_min = 1 + 2,
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.rd_max = 127 + 2,
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.s2div = icst307_s2div,
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.idx2s = icst307_idx2s,
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};
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static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
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.params = &versatile_auxosc_params,
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.vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
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.lock_offset = VERSATILE_SYS_LOCK_OFFSET,
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};
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static void __init cm_osc_setup(struct device_node *np,
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const struct clk_icst_desc *desc)
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{
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struct clk *clk = ERR_PTR(-EINVAL);
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const char *clk_name = np->name;
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const char *parent_name;
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if (!cm_base) {
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/* Remap the core module base if not done yet */
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struct device_node *parent;
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parent = of_get_parent(np);
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if (!parent) {
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pr_err("no parent on core module clock\n");
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return;
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}
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cm_base = of_iomap(parent, 0);
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if (!cm_base) {
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pr_err("could not remap core module base\n");
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return;
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}
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}
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parent_name = of_clk_get_parent_name(np, 0);
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clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
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if (!IS_ERR(clk))
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of_clk_add_provider(np, of_clk_src_simple_get, clk);
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}
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static void __init of_integrator_cm_osc_setup(struct device_node *np)
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{
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cm_osc_setup(np, &cm_auxosc_desc);
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}
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CLK_OF_DECLARE(integrator_cm_auxosc_clk,
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"arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
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static void __init of_versatile_cm_osc_setup(struct device_node *np)
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{
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cm_osc_setup(np, &versatile_auxosc_desc);
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}
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CLK_OF_DECLARE(versatile_cm_auxosc_clk,
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"arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);
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