tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Clock driver for the ARM Integrator/AP and Integrator/CP boards
3 * Copyright (C) 2012 Linus Walleij
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9#include <linux/clk-provider.h>
10#include <linux/clk.h>
11#include <linux/clkdev.h>
12#include <linux/err.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15
16#include "clk-icst.h"
17
18#define INTEGRATOR_HDR_LOCK_OFFSET 0x14
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 __initdata cm_auxosc_desc = {
35 .params = &cp_auxosc_params,
36 .vco_offset = 0x1c,
37 .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
38};
39
40static void __init of_integrator_cm_osc_setup(struct device_node *np)
41{
42 struct clk *clk = ERR_PTR(-EINVAL);
43 const char *clk_name = np->name;
44 const struct clk_icst_desc *desc = &cm_auxosc_desc;
45 const char *parent_name;
46
47 if (!cm_base) {
48 /* Remap the core module base if not done yet */
49 struct device_node *parent;
50
51 parent = of_get_parent(np);
52 if (!np) {
53 pr_err("no parent on core module clock\n");
54 return;
55 }
56 cm_base = of_iomap(parent, 0);
57 if (!cm_base) {
58 pr_err("could not remap core module base\n");
59 return;
60 }
61 }
62
63 parent_name = of_clk_get_parent_name(np, 0);
64 clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
65 if (!IS_ERR(clk))
66 of_clk_add_provider(np, of_clk_src_simple_get, clk);
67}
68CLK_OF_DECLARE(integrator_cm_auxosc_clk,
69 "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);