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.
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.
11 * Copyright (C) 2012 ARM Limited
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>
20 static struct clk *vexpress_sp810_timerclken[4];
21 static DEFINE_SPINLOCK(vexpress_sp810_lock);
23 static void __init vexpress_sp810_init(void __iomem *base)
30 for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++) {
32 const char *parents[] = {
33 "v2m:refclk32khz", /* REFCLK */
34 "v2m:refclk1mhz" /* TIMCLK */
37 snprintf(name, ARRAY_SIZE(name), "timerclken%d", i);
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);
44 if (WARN_ON(IS_ERR(vexpress_sp810_timerclken[i])))
50 static const char * const vexpress_clk_24mhz_periphs[] __initconst = {
51 "mb:uart0", "mb:uart1", "mb:uart2", "mb:uart3",
52 "mb:mmci", "mb:kmi0", "mb:kmi1"
55 void __init vexpress_clk_init(void __iomem *sp810_base)
60 clk = clk_register_fixed_rate(NULL, "dummy_apb_pclk", NULL,
62 WARN_ON(clk_register_clkdev(clk, "apb_pclk", NULL));
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]));
70 clk = clk_register_fixed_rate(NULL, "v2m:refclk32khz", NULL,
72 WARN_ON(clk_register_clkdev(clk, NULL, "v2m:wdt"));
74 clk = clk_register_fixed_rate(NULL, "v2m:refclk1mhz", NULL,
75 CLK_IS_ROOT, 1000000);
77 vexpress_sp810_init(sp810_base);
79 for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++)
80 WARN_ON(clk_set_parent(vexpress_sp810_timerclken[i], clk));
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"));