arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / arm / mach-omap2 / omap2-restart.c
blobfdcc75c97d707735b330cc652777fd145e8e4968
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * omap2-restart.c - code common to all OMAP2xxx machines.
5 * Copyright (C) 2012 Texas Instruments
6 * Paul Walmsley
7 */
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/clk.h>
11 #include <linux/io.h>
13 #include "soc.h"
14 #include "common.h"
15 #include "prm.h"
18 * reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set
19 * clock and the sys_ck. Used during the reset process
21 static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck;
23 /* Reboot handling */
25 /**
26 * omap2xxx_restart - Set DPLL to bypass mode for reboot to work
28 * Set the DPLL to bypass so that reboot completes successfully. No
29 * return value.
31 void omap2xxx_restart(enum reboot_mode mode, const char *cmd)
33 u32 rate;
35 rate = clk_get_rate(reset_sys_ck);
36 clk_set_rate(reset_virt_prcm_set_ck, rate);
38 /* XXX Should save the cmd argument for use after the reboot */
40 omap_prm_reset_system();
43 /**
44 * omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart
46 * Some clocks need to be looked up in advance for the SoC restart
47 * operation to work - see omap2xxx_restart(). Returns -EINVAL upon
48 * error or 0 upon success.
50 static int __init omap2xxx_common_look_up_clks_for_reset(void)
52 reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set");
53 if (IS_ERR(reset_virt_prcm_set_ck))
54 return -EINVAL;
56 reset_sys_ck = clk_get(NULL, "sys_ck");
57 if (IS_ERR(reset_sys_ck))
58 return -EINVAL;
60 return 0;
62 omap_postcore_initcall(omap2xxx_common_look_up_clks_for_reset);