1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Stefan Roese <sr@denx.de>
4  */
5 
6 #include <common.h>
7 #include <dm.h>
8 #include <fdtdec.h>
9 #include <linux/libfdt.h>
10 #include <pci.h>
11 #include <asm/io.h>
12 #include <asm/system.h>
13 #include <asm/arch/cpu.h>
14 #include <asm/arch/soc.h>
15 #include <asm/armv8/mmu.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 
19 /*
20  * Not all memory is mapped in the MMU. So we need to restrict the
21  * memory size so that U-Boot does not try to access it. Also, the
22  * internal registers are located at 0xf000.0000 - 0xffff.ffff.
23  * Currently only 2GiB are mapped for system memory. This is what
24  * we pass to the U-Boot subsystem here.
25  */
26 #define USABLE_RAM_SIZE		0x80000000
27 
28 ulong board_get_usable_ram_top(ulong total_size)
29 {
30 	if (gd->ram_size > USABLE_RAM_SIZE)
31 		return USABLE_RAM_SIZE;
32 
33 	return gd->ram_size;
34 }
35 
36 /*
37  * On ARMv8, MBus is not configured in U-Boot. To enable compilation
38  * of the already implemented drivers, lets add a dummy version of
39  * this function so that linking does not fail.
40  */
41 const struct mbus_dram_target_info *mvebu_mbus_dram_info(void)
42 {
43 	return NULL;
44 }
45 
46 /* DRAM init code ... */
47 
48 int dram_init_banksize(void)
49 {
50 	fdtdec_setup_memory_banksize();
51 
52 	return 0;
53 }
54 
55 int dram_init(void)
56 {
57 	if (fdtdec_setup_mem_size_base() != 0)
58 		return -EINVAL;
59 
60 	return 0;
61 }
62 
63 int arch_cpu_init(void)
64 {
65 	/* Nothing to do (yet) */
66 	return 0;
67 }
68 
69 int arch_early_init_r(void)
70 {
71 	struct udevice *dev;
72 	int ret;
73 	int i;
74 
75 	/*
76 	 * Loop over all MISC uclass drivers to call the comphy code
77 	 * and init all CP110 devices enabled in the DT
78 	 */
79 	i = 0;
80 	while (1) {
81 		/* Call the comphy code via the MISC uclass driver */
82 		ret = uclass_get_device(UCLASS_MISC, i++, &dev);
83 
84 		/* We're done, once no further CP110 device is found */
85 		if (ret)
86 			break;
87 	}
88 
89 	/* Cause the SATA device to do its early init */
90 	uclass_first_device(UCLASS_AHCI, &dev);
91 
92 #ifdef CONFIG_DM_PCI
93 	/* Trigger PCIe devices detection */
94 	pci_init();
95 #endif
96 
97 	return 0;
98 }
99