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https://github.com/edk2-porting/linux-next.git
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66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
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/*
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* omap2-restart.c - code common to all OMAP2xxx machines.
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*
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* Copyright (C) 2012 Texas Instruments
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include "common.h"
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#include "prm2xxx.h"
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/*
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* reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set
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* clock and the sys_ck. Used during the reset process
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*/
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static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck;
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/* Reboot handling */
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/**
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* omap2xxx_restart - Set DPLL to bypass mode for reboot to work
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*
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* Set the DPLL to bypass so that reboot completes successfully. No
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* return value.
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*/
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void omap2xxx_restart(char mode, const char *cmd)
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{
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u32 rate;
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rate = clk_get_rate(reset_sys_ck);
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clk_set_rate(reset_virt_prcm_set_ck, rate);
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/* XXX Should save the cmd argument for use after the reboot */
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omap2xxx_prm_dpll_reset(); /* never returns */
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while (1);
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}
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/**
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* omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart
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*
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* Some clocks need to be looked up in advance for the SoC restart
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* operation to work - see omap2xxx_restart(). Returns -EINVAL upon
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* error or 0 upon success.
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*/
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static int __init omap2xxx_common_look_up_clks_for_reset(void)
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{
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reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set");
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if (IS_ERR(reset_virt_prcm_set_ck))
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return -EINVAL;
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reset_sys_ck = clk_get(NULL, "sys_ck");
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if (IS_ERR(reset_sys_ck))
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return -EINVAL;
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return 0;
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}
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core_initcall(omap2xxx_common_look_up_clks_for_reset);
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