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>
19 #include <linux/of_address.h>
20 #include <linux/vexpress.h>
22 static struct clk *vexpress_sp810_timerclken[4];
23 static DEFINE_SPINLOCK(vexpress_sp810_lock);
25 static void __init vexpress_sp810_init(void __iomem *base)
32 for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++) {
34 const char *parents[] = {
35 "v2m:refclk32khz", /* REFCLK */
36 "v2m:refclk1mhz" /* TIMCLK */
39 snprintf(name, ARRAY_SIZE(name), "timerclken%d", i);
41 vexpress_sp810_timerclken[i] = clk_register_mux(NULL, name,
42 parents, 2, 0, base + SCCTRL,
43 SCCTRL_TIMERENnSEL_SHIFT(i), 1,
44 0, &vexpress_sp810_lock);
46 if (WARN_ON(IS_ERR(vexpress_sp810_timerclken[i])))
52 static const char * const vexpress_clk_24mhz_periphs[] __initconst = {
53 "mb:uart0", "mb:uart1", "mb:uart2", "mb:uart3",
54 "mb:mmci", "mb:kmi0", "mb:kmi1"
57 void __init vexpress_clk_init(void __iomem *sp810_base)
62 clk = clk_register_fixed_rate(NULL, "dummy_apb_pclk", NULL,
64 WARN_ON(clk_register_clkdev(clk, "apb_pclk", NULL));
66 clk = clk_register_fixed_rate(NULL, "v2m:clk_24mhz", NULL,
67 CLK_IS_ROOT, 24000000);
68 for (i = 0; i < ARRAY_SIZE(vexpress_clk_24mhz_periphs); i++)
69 WARN_ON(clk_register_clkdev(clk, NULL,
70 vexpress_clk_24mhz_periphs[i]));
72 clk = clk_register_fixed_rate(NULL, "v2m:refclk32khz", NULL,
74 WARN_ON(clk_register_clkdev(clk, NULL, "v2m:wdt"));
76 clk = clk_register_fixed_rate(NULL, "v2m:refclk1mhz", NULL,
77 CLK_IS_ROOT, 1000000);
79 vexpress_sp810_init(sp810_base);
81 for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++)
82 WARN_ON(clk_set_parent(vexpress_sp810_timerclken[i], clk));
84 WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[0],
85 "v2m-timer0", "sp804"));
86 WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[1],
87 "v2m-timer1", "sp804"));
90 #if defined(CONFIG_OF)
92 struct clk *vexpress_sp810_of_get(struct of_phandle_args *clkspec, void *data)
94 if (WARN_ON(clkspec->args_count != 1 || clkspec->args[0] >
95 ARRAY_SIZE(vexpress_sp810_timerclken)))
98 return vexpress_sp810_timerclken[clkspec->args[0]];
101 void __init vexpress_clk_of_init(void)
103 struct device_node *node;
105 struct clk *refclk, *timclk;
109 node = of_find_compatible_node(NULL, NULL, "arm,sp810");
110 vexpress_sp810_init(of_iomap(node, 0));
111 of_clk_add_provider(node, vexpress_sp810_of_get, NULL);
113 /* Select "better" (faster) parent for SP804 timers */
114 refclk = of_clk_get_by_name(node, "refclk");
115 timclk = of_clk_get_by_name(node, "timclk");
116 if (!WARN_ON(IS_ERR(refclk) || IS_ERR(timclk))) {
119 if (clk_get_rate(refclk) > clk_get_rate(timclk))
124 for (i = 0; i < ARRAY_SIZE(vexpress_sp810_timerclken); i++)
125 WARN_ON(clk_set_parent(vexpress_sp810_timerclken[i],
129 WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[0],
130 "v2m-timer0", "sp804"));
131 WARN_ON(clk_register_clkdev(vexpress_sp810_timerclken[1],
132 "v2m-timer1", "sp804"));