1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * omap2-restart.c - code common to all OMAP2xxx machines. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2012 Texas Instruments 6*4882a593Smuzhiyun * Paul Walmsley 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun #include <linux/kernel.h> 9*4882a593Smuzhiyun #include <linux/init.h> 10*4882a593Smuzhiyun #include <linux/clk.h> 11*4882a593Smuzhiyun #include <linux/io.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #include "soc.h" 14*4882a593Smuzhiyun #include "common.h" 15*4882a593Smuzhiyun #include "prm.h" 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun /* 18*4882a593Smuzhiyun * reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set 19*4882a593Smuzhiyun * clock and the sys_ck. Used during the reset process 20*4882a593Smuzhiyun */ 21*4882a593Smuzhiyun static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun /* Reboot handling */ 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /** 26*4882a593Smuzhiyun * omap2xxx_restart - Set DPLL to bypass mode for reboot to work 27*4882a593Smuzhiyun * 28*4882a593Smuzhiyun * Set the DPLL to bypass so that reboot completes successfully. No 29*4882a593Smuzhiyun * return value. 30*4882a593Smuzhiyun */ omap2xxx_restart(enum reboot_mode mode,const char * cmd)31*4882a593Smuzhiyunvoid omap2xxx_restart(enum reboot_mode mode, const char *cmd) 32*4882a593Smuzhiyun { 33*4882a593Smuzhiyun u32 rate; 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun rate = clk_get_rate(reset_sys_ck); 36*4882a593Smuzhiyun clk_set_rate(reset_virt_prcm_set_ck, rate); 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun /* XXX Should save the cmd argument for use after the reboot */ 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun omap_prm_reset_system(); 41*4882a593Smuzhiyun } 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun /** 44*4882a593Smuzhiyun * omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart 45*4882a593Smuzhiyun * 46*4882a593Smuzhiyun * Some clocks need to be looked up in advance for the SoC restart 47*4882a593Smuzhiyun * operation to work - see omap2xxx_restart(). Returns -EINVAL upon 48*4882a593Smuzhiyun * error or 0 upon success. 49*4882a593Smuzhiyun */ omap2xxx_common_look_up_clks_for_reset(void)50*4882a593Smuzhiyunstatic int __init omap2xxx_common_look_up_clks_for_reset(void) 51*4882a593Smuzhiyun { 52*4882a593Smuzhiyun reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set"); 53*4882a593Smuzhiyun if (IS_ERR(reset_virt_prcm_set_ck)) 54*4882a593Smuzhiyun return -EINVAL; 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun reset_sys_ck = clk_get(NULL, "sys_ck"); 57*4882a593Smuzhiyun if (IS_ERR(reset_sys_ck)) 58*4882a593Smuzhiyun return -EINVAL; 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun return 0; 61*4882a593Smuzhiyun } 62*4882a593Smuzhiyun omap_postcore_initcall(omap2xxx_common_look_up_clks_for_reset); 63