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62 lines
1.5 KiB
62 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* omap2-restart.c - code common to all OMAP2xxx machines. |
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* |
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* Copyright (C) 2012 Texas Instruments |
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* Paul Walmsley |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include "soc.h" |
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#include "common.h" |
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#include "prm.h" |
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/* |
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* reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set |
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* clock and the sys_ck. Used during the reset process |
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*/ |
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static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck; |
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/* Reboot handling */ |
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/** |
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* omap2xxx_restart - Set DPLL to bypass mode for reboot to work |
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* |
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* Set the DPLL to bypass so that reboot completes successfully. No |
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* return value. |
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*/ |
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void omap2xxx_restart(enum reboot_mode mode, const char *cmd) |
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{ |
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u32 rate; |
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rate = clk_get_rate(reset_sys_ck); |
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clk_set_rate(reset_virt_prcm_set_ck, rate); |
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/* XXX Should save the cmd argument for use after the reboot */ |
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omap_prm_reset_system(); |
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} |
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/** |
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* omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart |
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* |
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* Some clocks need to be looked up in advance for the SoC restart |
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* operation to work - see omap2xxx_restart(). Returns -EINVAL upon |
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* error or 0 upon success. |
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*/ |
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static int __init omap2xxx_common_look_up_clks_for_reset(void) |
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{ |
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reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set"); |
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if (IS_ERR(reset_virt_prcm_set_ck)) |
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return -EINVAL; |
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reset_sys_ck = clk_get(NULL, "sys_ck"); |
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if (IS_ERR(reset_sys_ck)) |
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return -EINVAL; |
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return 0; |
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} |
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omap_postcore_initcall(omap2xxx_common_look_up_clks_for_reset);
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