/*
 * Copyright (C) 2013 Silvio Gissi <silvio.gissi@outlook.com>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <unicore-mx/lpc17xx/clock.h>

const clock_scale_t clock_scale[] = {
	{
		/* ( 2 * M * Fin ) / N = 200MHz
		 * Final div = 2
		 * Clk = 96MHz
		 */
		.m = 25,
		.n = 3,
		.cclkdiv = 2,
	},
	{
		/* ( 2 * M * Fin ) / N = 240MHz
		 * Final div = 2
		 * Clk = 120MHz
		 */
		.m = 30,
		.n = 3,
		.cclkdiv = 2,
	}
};

void clock_setup(const clock_scale_t *clock)
{
	/* Enable the external clock */
	CLK_SCS |= CLK_SCS_OSCEN;
	while ((CLK_SCS & CLK_SCS_OSCSTAT) == 0);

	/* Select external oscilator */
	CLK_CLKSRCSEL = CLK_CLKSRCSEL_MAIN;

	CLK_PLL0CFG = PLL0_CFG_VAL(clock->m, clock->n);

	/*Feed*/
	CLK_PLL0FEED = PLL_KICK0;
	CLK_PLL0FEED = PLL_KICK1;

	/*PLL0 Enable */
	CLK_PLL0CON = CLK_PLLCON_ENABLE;

	/*Feed*/
	CLK_PLL0FEED = PLL_KICK0;
	CLK_PLL0FEED = PLL_KICK1;

	/* Divide by 3 */
	CLK_CCLKCFG = clock->cclkdiv;

	/* wait until locked */
	while (!(CLK_PLL0STAT & CLK_PLL0STAT_PLOCK));

	/* see flash accelerator - TBD */
	/* _FLASHCFG = (_FLASHCFG & 0xFFF) | (4<<12); */

	/* PLL0 connect */
	CLK_PLL0CON |= CLK_PLLCON_CONNECT;

	/*Feed*/
	CLK_PLL0FEED = PLL_KICK0;
	CLK_PLL0FEED = PLL_KICK1;
	/* PLL0 operational */
}