Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * omap2-restart.c - code common to all OMAP2xxx machines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2012 Texas Instruments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Paul Walmsley
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "soc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "prm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  * reset_virt_prcm_set_ck, reset_sys_ck: pointers to the virt_prcm_set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * clock and the sys_ck.  Used during the reset process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static struct clk *reset_virt_prcm_set_ck, *reset_sys_ck;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /* Reboot handling */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  * omap2xxx_restart - Set DPLL to bypass mode for reboot to work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  * Set the DPLL to bypass so that reboot completes successfully.  No
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * return value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) void omap2xxx_restart(enum reboot_mode mode, const char *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	u32 rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	rate = clk_get_rate(reset_sys_ck);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	clk_set_rate(reset_virt_prcm_set_ck, rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	/* XXX Should save the cmd argument for use after the reboot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	omap_prm_reset_system();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)  * omap2xxx_common_look_up_clks_for_reset - look up clocks needed for restart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)  * Some clocks need to be looked up in advance for the SoC restart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)  * operation to work - see omap2xxx_restart().  Returns -EINVAL upon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)  * error or 0 upon success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int __init omap2xxx_common_look_up_clks_for_reset(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	reset_virt_prcm_set_ck = clk_get(NULL, "virt_prcm_set");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if (IS_ERR(reset_virt_prcm_set_ck))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	reset_sys_ck = clk_get(NULL, "sys_ck");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	if (IS_ERR(reset_sys_ck))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) omap_postcore_initcall(omap2xxx_common_look_up_clks_for_reset);