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