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-rw-r--r--arch/arm/mach-omap2/omap2-restart.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap2-restart.c b/arch/arm/mach-omap2/omap2-restart.c
new file mode 100644
index 000000000000..be6bc89ab1e8
--- /dev/null
+++ b/arch/arm/mach-omap2/omap2-restart.c
@@ -0,0 +1,65 @@
1/*
2 * omap2-restart.c - code common to all OMAP2xxx machines.
3 *
4 * Copyright (C) 2012 Texas Instruments
5 * Paul Walmsley
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/clk.h>
14#include <linux/io.h>
15
16#include "common.h"
17#include "prm2xxx.h"
18
19/*
20 * reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set
21 * clock and the sys_ck. Used during the reset process
22 */
23static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck;
24
25/* Reboot handling */
26
27/**
28 * omap2xxx_restart - Set DPLL to bypass mode for reboot to work
29 *
30 * Set the DPLL to bypass so that reboot completes successfully. No
31 * return value.
32 */
33void omap2xxx_restart(char mode, const char *cmd)
34{
35 u32 rate;
36
37 rate = clk_get_rate(reset_sys_ck);
38 clk_set_rate(reset_virt_prcm_set_ck, rate);
39
40 /* XXX Should save the cmd argument for use after the reboot */
41
42 omap2xxx_prm_dpll_reset(); /* never returns */
43 while (1);
44}
45
46/**
47 * omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart
48 *
49 * Some clocks need to be looked up in advance for the SoC restart
50 * operation to work - see omap2xxx_restart(). Returns -EINVAL upon
51 * error or 0 upon success.
52 */
53static int __init omap2xxx_common_look_up_clks_for_reset(void)
54{
55 reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set");
56 if (IS_ERR(reset_virt_prcm_set_ck))
57 return -EINVAL;
58
59 reset_sys_ck = clk_get(NULL, "sys_ck");
60 if (IS_ERR(reset_sys_ck))
61 return -EINVAL;
62
63 return 0;
64}
65core_initcall(omap2xxx_common_look_up_clks_for_reset);