1 /*
2  * Copyright 2014 Freescale Semiconductor, Inc.
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <asm/io.h>
9 #if !defined(CONFIG_ARMV7_NONSEC) || !defined(CONFIG_ARMV7_VIRT)
10 #error " Deep sleep needs non-secure mode support. "
11 #else
12 #include <asm/secure.h>
13 #endif
14 #include <asm/armv7.h>
15 #include <asm/cache.h>
16 
17 #if defined(CONFIG_LS102XA)
18 #include <asm/arch/immap_ls102xa.h>
19 #endif
20 
21 #include "sleep.h"
22 
23 DECLARE_GLOBAL_DATA_PTR;
24 
25 void __weak board_mem_sleep_setup(void)
26 {
27 }
28 
29 void __weak board_sleep_prepare(void)
30 {
31 }
32 
33 bool is_warm_boot(void)
34 {
35 	struct ccsr_gur __iomem *gur = (void *)CONFIG_SYS_FSL_GUTS_ADDR;
36 
37 	if (in_be32(&gur->crstsr) & DCFG_CCSR_CRSTSR_WDRFR)
38 		return 1;
39 
40 	return 0;
41 }
42 
43 void fsl_dp_disable_console(void)
44 {
45 	gd->flags |= GD_FLG_SILENT | GD_FLG_DISABLE_CONSOLE;
46 }
47 
48 /*
49  * When wakeup from deep sleep, the first 128 bytes space
50  * will be used to do DDR training which corrupts the data
51  * in there. This function will restore them.
52  */
53 static void dp_ddr_restore(void)
54 {
55 	u64 *src, *dst;
56 	int i;
57 	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;
58 
59 	/* get the address of ddr date from SPARECR3 */
60 	src = (u64 *)in_le32(&scfg->sparecr[2]);
61 	dst = (u64 *)CONFIG_SYS_SDRAM_BASE;
62 
63 	for (i = 0; i < DDR_BUFF_LEN / 8; i++)
64 		*dst++ = *src++;
65 
66 	flush_dcache_all();
67 }
68 
69 static void dp_resume_prepare(void)
70 {
71 	dp_ddr_restore();
72 	board_sleep_prepare();
73 	armv7_init_nonsec();
74 	cleanup_before_linux();
75 }
76 
77 int fsl_dp_resume(void)
78 {
79 	u32 start_addr;
80 	void (*kernel_resume)(void);
81 	struct ccsr_scfg __iomem *scfg = (void *)CONFIG_SYS_FSL_SCFG_ADDR;
82 
83 	if (!is_warm_boot())
84 		return 0;
85 
86 	dp_resume_prepare();
87 
88 	/* Get the entry address and jump to kernel */
89 	start_addr = in_le32(&scfg->sparecr[1]);
90 	debug("Entry address is 0x%08x\n", start_addr);
91 	kernel_resume = (void (*)(void))start_addr;
92 	secure_ram_addr(_do_nonsec_entry)(kernel_resume, 0, 0, 0);
93 
94 	return 0;
95 }
96