| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * omap2-restart.c - code common to all OMAP2xxx machines. |
| 4 | * |
| 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> |
| 12 | |
| 13 | #include "soc.h" |
| 14 | #include "common.h" |
| 15 | #include "prm.h" |
| 16 | |
| 17 | /* |
| 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 |
| 20 | */ |
| 21 | static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck; |
| 22 | |
| 23 | /* Reboot handling */ |
| 24 | |
| 25 | /** |
| 26 | * omap2xxx_restart - Set DPLL to bypass mode for reboot to work |
| 27 | * |
| 28 | * Set the DPLL to bypass so that reboot completes successfully. No |
| 29 | * return value. |
| 30 | */ |
| 31 | void omap2xxx_restart(enum reboot_mode mode, const char *cmd) |
| 32 | { |
| 33 | u32 rate; |
| 34 | |
| 35 | rate = clk_get_rate(clk: reset_sys_ck); |
| 36 | clk_set_rate(clk: reset_virt_prcm_set_ck, rate); |
| 37 | |
| 38 | /* XXX Should save the cmd argument for use after the reboot */ |
| 39 | |
| 40 | omap_prm_reset_system(); |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart |
| 45 | * |
| 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. |
| 49 | */ |
| 50 | static int __init omap2xxx_common_look_up_clks_for_reset(void) |
| 51 | { |
| 52 | reset_virt_prcm_set_ck = clk_get(NULL, id: "virt_prcm_set"); |
| 53 | if (IS_ERR(ptr: reset_virt_prcm_set_ck)) |
| 54 | return -EINVAL; |
| 55 | |
| 56 | reset_sys_ck = clk_get(NULL, id: "sys_ck"); |
| 57 | if (IS_ERR(ptr: reset_sys_ck)) |
| 58 | return -EINVAL; |
| 59 | |
| 60 | return 0; |
| 61 | } |
| 62 | omap_postcore_initcall(omap2xxx_common_look_up_clks_for_reset); |
| 63 |