/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Copyright (C) 2012 ARM Limited
 */

#include <linux/amba/sp810.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/vexpress.h>

static DEFINE_SPINLOCK(vexpress_sp810_lock);

static const char * const vexpress_clk_24mhz_periphs[] __initconst = {
	"mb:uart0", "mb:uart1", "mb:uart2", "mb:uart3",
	"mb:mmci", "mb:kmi0", "mb:kmi1"
};

void __init vexpress_clk_init(void __iomem *sp810_base)
{
	struct clk *clk;
	const char *sp810_parent_names[] = {
		"v2m:refclk32khz", /* REFCLK */
		"v2m:refclk1mhz" /* TIMCLK */
	};
	struct clk *sp810_parent;
	int i;

	clk = clk_register_fixed_rate(NULL, "dummy_apb_pclk", NULL,
			CLK_IS_ROOT, 0);
	WARN_ON(clk_register_clkdev(clk, "apb_pclk", NULL));

	clk = clk_register_fixed_rate(NULL, "v2m:clk_24mhz", NULL,
			CLK_IS_ROOT, 24000000);
	for (i = 0; i < ARRAY_SIZE(vexpress_clk_24mhz_periphs); i++)
		WARN_ON(clk_register_clkdev(clk, NULL,
				vexpress_clk_24mhz_periphs[i]));

	clk = clk_register_fixed_rate(NULL, "v2m:refclk32khz", NULL,
			CLK_IS_ROOT, 32768);
	WARN_ON(clk_register_clkdev(clk, NULL, "v2m:wdt"));

	sp810_parent = clk_register_fixed_rate(NULL, "v2m:refclk1mhz", NULL,
			CLK_IS_ROOT, 1000000);

	clk = clk_register_mux(NULL, "timerclken0",
			sp810_parent_names, 2, 0, sp810_base + SCCTRL,
			SCCTRL_TIMERENnSEL_SHIFT(0), 1,
			0, &vexpress_sp810_lock);
	WARN_ON(clk_set_parent(clk, sp810_parent));
	WARN_ON(clk_register_clkdev(clk, "v2m-timer0", "sp804"));

	clk = clk_register_mux(NULL, "timerclken1",
			sp810_parent_names, 2, 0, sp810_base + SCCTRL,
			SCCTRL_TIMERENnSEL_SHIFT(1), 1,
			0, &vexpress_sp810_lock);
	WARN_ON(clk_set_parent(clk, sp810_parent));
	WARN_ON(clk_register_clkdev(clk, "v2m-timer1", "sp804"));
}

#if defined(CONFIG_OF)

void __init vexpress_clk_of_init(void)
{
	of_clk_init(NULL);
}

#endif