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Linus Walleij401301c2012-11-20 22:39:31 +01001/*
Rob Herringa54c9592014-03-01 22:05:44 -06002 * Clock driver for the ARM Integrator/AP, Integrator/CP, Versatile AB and
3 * Versatile PB boards.
Linus Walleij401301c2012-11-20 22:39:31 +01004 * Copyright (C) 2012 Linus Walleij
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/clk-provider.h>
Linus Walleija6131632012-06-11 17:33:12 +020011#include <linux/err.h>
Linus Walleij09c978b2014-01-10 15:57:27 +010012#include <linux/of.h>
13#include <linux/of_address.h>
Linus Walleija6131632012-06-11 17:33:12 +020014
15#include "clk-icst.h"
16
Linus Walleij09c978b2014-01-10 15:57:27 +010017#define INTEGRATOR_HDR_LOCK_OFFSET 0x14
Linus Walleija6131632012-06-11 17:33:12 +020018
Rob Herringa54c9592014-03-01 22:05:44 -060019#define VERSATILE_SYS_OSCCLCD_OFFSET 0x1c
20#define VERSATILE_SYS_LOCK_OFFSET 0x20
21
Linus Walleij09c978b2014-01-10 15:57:27 +010022/* Base offset for the core module */
23static void __iomem *cm_base;
24
25static const struct icst_params cp_auxosc_params = {
Linus Walleija6131632012-06-11 17:33:12 +020026 .vco_max = ICST525_VCO_MAX_5V,
27 .vco_min = ICST525_VCO_MIN,
28 .vd_min = 8,
29 .vd_max = 263,
30 .rd_min = 3,
31 .rd_max = 65,
32 .s2div = icst525_s2div,
33 .idx2s = icst525_idx2s,
34};
35
Nicolas Pitree3ee2762015-07-28 19:43:20 -040036static const struct clk_icst_desc cm_auxosc_desc __initconst = {
Linus Walleij09c978b2014-01-10 15:57:27 +010037 .params = &cp_auxosc_params,
Linus Walleij7a9ad672012-11-20 23:01:04 +010038 .vco_offset = 0x1c,
39 .lock_offset = INTEGRATOR_HDR_LOCK_OFFSET,
Linus Walleija6131632012-06-11 17:33:12 +020040};
41
Rob Herringa54c9592014-03-01 22:05:44 -060042static const struct icst_params versatile_auxosc_params = {
43 .vco_max = ICST307_VCO_MAX,
44 .vco_min = ICST307_VCO_MIN,
45 .vd_min = 4 + 8,
46 .vd_max = 511 + 8,
47 .rd_min = 1 + 2,
48 .rd_max = 127 + 2,
49 .s2div = icst307_s2div,
50 .idx2s = icst307_idx2s,
51};
52
53static const struct clk_icst_desc versatile_auxosc_desc __initconst = {
54 .params = &versatile_auxosc_params,
55 .vco_offset = VERSATILE_SYS_OSCCLCD_OFFSET,
56 .lock_offset = VERSATILE_SYS_LOCK_OFFSET,
57};
58static void __init cm_osc_setup(struct device_node *np,
59 const struct clk_icst_desc *desc)
Linus Walleija6131632012-06-11 17:33:12 +020060{
Linus Walleij09c978b2014-01-10 15:57:27 +010061 struct clk *clk = ERR_PTR(-EINVAL);
62 const char *clk_name = np->name;
Linus Walleijbf6edb42014-01-20 21:31:41 +010063 const char *parent_name;
Linus Walleija6131632012-06-11 17:33:12 +020064
Linus Walleij09c978b2014-01-10 15:57:27 +010065 if (!cm_base) {
66 /* Remap the core module base if not done yet */
67 struct device_node *parent;
Linus Walleija6131632012-06-11 17:33:12 +020068
Linus Walleij09c978b2014-01-10 15:57:27 +010069 parent = of_get_parent(np);
Julia Lawalle52786a2015-04-04 16:59:29 +020070 if (!parent) {
Linus Walleij09c978b2014-01-10 15:57:27 +010071 pr_err("no parent on core module clock\n");
72 return;
73 }
74 cm_base = of_iomap(parent, 0);
75 if (!cm_base) {
76 pr_err("could not remap core module base\n");
77 return;
78 }
79 }
Linus Walleija6131632012-06-11 17:33:12 +020080
Linus Walleijbf6edb42014-01-20 21:31:41 +010081 parent_name = of_clk_get_parent_name(np, 0);
82 clk = icst_clk_register(NULL, desc, clk_name, parent_name, cm_base);
Linus Walleij09c978b2014-01-10 15:57:27 +010083 if (!IS_ERR(clk))
84 of_clk_add_provider(np, of_clk_src_simple_get, clk);
Linus Walleija6131632012-06-11 17:33:12 +020085}
Rob Herringa54c9592014-03-01 22:05:44 -060086
87static void __init of_integrator_cm_osc_setup(struct device_node *np)
88{
89 cm_osc_setup(np, &cm_auxosc_desc);
90}
Linus Walleij09c978b2014-01-10 15:57:27 +010091CLK_OF_DECLARE(integrator_cm_auxosc_clk,
92 "arm,integrator-cm-auxosc", of_integrator_cm_osc_setup);
Rob Herringa54c9592014-03-01 22:05:44 -060093
94static void __init of_versatile_cm_osc_setup(struct device_node *np)
95{
96 cm_osc_setup(np, &versatile_auxosc_desc);
97}
98CLK_OF_DECLARE(versatile_cm_auxosc_clk,
99 "arm,versatile-cm-auxosc", of_versatile_cm_osc_setup);