1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9 * GNU General Public License for more details.
10 *
11 * Copyright (C) 2012 ARM Limited
12 */
13
14#include <linux/amba/sp810.h>
15#include <linux/clkdev.h>
16#include <linux/clk-provider.h>
17#include <linux/err.h>
18#include <linux/vexpress.h>
19
20static struct clk *vexpress_sp810_timerclken[4];
21static DEFINE_SPINLOCK(vexpress_sp810_lock);
22
23static void __init vexpress_sp810_init(void __iomem *base)
24{
25	int i;
26
27	if (WARN_ON(!base))
28		return;
29
30	for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++) {
31		char name[12];
32		const char *parents[] = {
33			"v2m:refclk32khz", /* REFCLK */
34			"v2m:refclk1mhz" /* TIMCLK */
35		};
36
37		snprintf(name, ARRAY_SIZE(name), "timerclken%d", i);
38
39		vexpress_sp810_timerclken[i] = clk_register_mux(NULL, name,
40				parents, 2, CLK_SET_RATE_NO_REPARENT,
41				base + SCCTRL, SCCTRL_TIMERENnSEL_SHIFT(i), 1,
42				0, &vexpress_sp810_lock);
43
44		if (WARN_ON(IS_ERR(vexpress_sp810_timerclken[i])))
45			break;
46	}
47}
48
49
50static const char * const vexpress_clk_24mhz_periphs[] __initconst = {
51	"mb:uart0", "mb:uart1", "mb:uart2", "mb:uart3",
52	"mb:mmci", "mb:kmi0", "mb:kmi1"
53};
54
55void __init vexpress_clk_init(void __iomem *sp810_base)
56{
57	struct clk *clk;
58	int i;
59
60	clk = clk_register_fixed_rate(NULL, "dummy_apb_pclk", NULL,
61			CLK_IS_ROOT, 0);
62	WARN_ON(clk_register_clkdev(clk, "apb_pclk", NULL));
63
64	clk = clk_register_fixed_rate(NULL, "v2m:clk_24mhz", NULL,
65			CLK_IS_ROOT, 24000000);
66	for (i = 0; i < ARRAY_SIZE(vexpress_clk_24mhz_periphs); i++)
67		WARN_ON(clk_register_clkdev(clk, NULL,
68				vexpress_clk_24mhz_periphs[i]));
69
70	clk = clk_register_fixed_rate(NULL, "v2m:refclk32khz", NULL,
71			CLK_IS_ROOT, 32768);
72	WARN_ON(clk_register_clkdev(clk, NULL, "v2m:wdt"));
73
74	clk = clk_register_fixed_rate(NULL, "v2m:refclk1mhz", NULL,
75			CLK_IS_ROOT, 1000000);
76
77	vexpress_sp810_init(sp810_base);
78
79	for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++)
80		WARN_ON(clk_set_parent(vexpress_sp810_timerclken[i], clk));
81
82	WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[0],
83				"v2m-timer0", "sp804"));
84	WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[1],
85				"v2m-timer1", "sp804"));
86}
87