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2f334a38 PW |
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 | ||
b76c8b19 | 16 | #include "soc.h" |
2f334a38 PW |
17 | #include "common.h" |
18 | #include "prm2xxx.h" | |
19 | ||
20 | /* | |
21 | * reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set | |
22 | * clock and the sys_ck. Used during the reset process | |
23 | */ | |
24 | static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck; | |
25 | ||
26 | /* Reboot handling */ | |
27 | ||
28 | /** | |
29 | * omap2xxx_restart - Set DPLL to bypass mode for reboot to work | |
30 | * | |
31 | * Set the DPLL to bypass so that reboot completes successfully. No | |
32 | * return value. | |
33 | */ | |
7b6d864b | 34 | void omap2xxx_restart(enum reboot_mode mode, const char *cmd) |
2f334a38 PW |
35 | { |
36 | u32 rate; | |
37 | ||
38 | rate = clk_get_rate(reset_sys_ck); | |
39 | clk_set_rate(reset_virt_prcm_set_ck, rate); | |
40 | ||
41 | /* XXX Should save the cmd argument for use after the reboot */ | |
42 | ||
43 | omap2xxx_prm_dpll_reset(); /* never returns */ | |
44 | while (1); | |
45 | } | |
46 | ||
47 | /** | |
48 | * omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart | |
49 | * | |
50 | * Some clocks need to be looked up in advance for the SoC restart | |
51 | * operation to work - see omap2xxx_restart(). Returns -EINVAL upon | |
52 | * error or 0 upon success. | |
53 | */ | |
54 | static int __init omap2xxx_common_look_up_clks_for_reset(void) | |
55 | { | |
56 | reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set"); | |
57 | if (IS_ERR(reset_virt_prcm_set_ck)) | |
58 | return -EINVAL; | |
59 | ||
60 | reset_sys_ck = clk_get(NULL, "sys_ck"); | |
61 | if (IS_ERR(reset_sys_ck)) | |
62 | return -EINVAL; | |
63 | ||
64 | return 0; | |
65 | } | |
b76c8b19 | 66 | omap_core_initcall(omap2xxx_common_look_up_clks_for_reset); |