66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
|
/*
|
||
|
|
* omap2-restart.c - code common to all OMAP2xxx machines.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2012 Texas Instruments
|
||
|
|
* Paul Walmsley
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/clk.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
|
||
|
|
#include "common.h"
|
||
|
|
#include "prm2xxx.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set
|
||
|
|
* clock and the sys_ck. Used during the reset process
|
||
|
|
*/
|
||
|
|
static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck;
|
||
|
|
|
||
|
|
/* Reboot handling */
|
||
|
|
|
||
|
|
/**
|
||
|
|
* omap2xxx_restart - Set DPLL to bypass mode for reboot to work
|
||
|
|
*
|
||
|
|
* Set the DPLL to bypass so that reboot completes successfully. No
|
||
|
|
* return value.
|
||
|
|
*/
|
||
|
|
void omap2xxx_restart(char mode, const char *cmd)
|
||
|
|
{
|
||
|
|
u32 rate;
|
||
|
|
|
||
|
|
rate = clk_get_rate(reset_sys_ck);
|
||
|
|
clk_set_rate(reset_virt_prcm_set_ck, rate);
|
||
|
|
|
||
|
|
/* XXX Should save the cmd argument for use after the reboot */
|
||
|
|
|
||
|
|
omap2xxx_prm_dpll_reset(); /* never returns */
|
||
|
|
while (1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart
|
||
|
|
*
|
||
|
|
* Some clocks need to be looked up in advance for the SoC restart
|
||
|
|
* operation to work - see omap2xxx_restart(). Returns -EINVAL upon
|
||
|
|
* error or 0 upon success.
|
||
|
|
*/
|
||
|
|
static int __init omap2xxx_common_look_up_clks_for_reset(void)
|
||
|
|
{
|
||
|
|
reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set");
|
||
|
|
if (IS_ERR(reset_virt_prcm_set_ck))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
reset_sys_ck = clk_get(NULL, "sys_ck");
|
||
|
|
if (IS_ERR(reset_sys_ck))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
core_initcall(omap2xxx_common_look_up_clks_for_reset);
|