1 /*
2  * Copyright (C) 2016 Stefan Roese <sr@denx.de>
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <dm.h>
9 #include <fdtdec.h>
10 #include <libfdt.h>
11 #include <pci.h>
12 #include <asm/io.h>
13 #include <asm/system.h>
14 #include <asm/arch/cpu.h>
15 #include <asm/arch/soc.h>
16 #include <asm/armv8/mmu.h>
17 
18 DECLARE_GLOBAL_DATA_PTR;
19 
20 /*
21  * Not all memory is mapped in the MMU. So we need to restrict the
22  * memory size so that U-Boot does not try to access it. Also, the
23  * internal registers are located at 0xf000.0000 - 0xffff.ffff.
24  * Currently only 2GiB are mapped for system memory. This is what
25  * we pass to the U-Boot subsystem here.
26  */
27 #define USABLE_RAM_SIZE		0x80000000
28 
29 ulong board_get_usable_ram_top(ulong total_size)
30 {
31 	if (gd->ram_size > USABLE_RAM_SIZE)
32 		return USABLE_RAM_SIZE;
33 
34 	return gd->ram_size;
35 }
36 
37 /*
38  * On ARMv8, MBus is not configured in U-Boot. To enable compilation
39  * of the already implemented drivers, lets add a dummy version of
40  * this function so that linking does not fail.
41  */
42 const struct mbus_dram_target_info *mvebu_mbus_dram_info(void)
43 {
44 	return NULL;
45 }
46 
47 /* DRAM init code ... */
48 
49 int dram_init_banksize(void)
50 {
51 	fdtdec_setup_memory_banksize();
52 
53 	return 0;
54 }
55 
56 int dram_init(void)
57 {
58 	if (fdtdec_setup_memory_size() != 0)
59 		return -EINVAL;
60 
61 	return 0;
62 }
63 
64 int arch_cpu_init(void)
65 {
66 	/* Nothing to do (yet) */
67 	return 0;
68 }
69 
70 int arch_early_init_r(void)
71 {
72 	struct udevice *dev;
73 	int ret;
74 	int i;
75 
76 	/*
77 	 * Loop over all MISC uclass drivers to call the comphy code
78 	 * and init all CP110 devices enabled in the DT
79 	 */
80 	i = 0;
81 	while (1) {
82 		/* Call the comphy code via the MISC uclass driver */
83 		ret = uclass_get_device(UCLASS_MISC, i++, &dev);
84 
85 		/* We're done, once no further CP110 device is found */
86 		if (ret)
87 			break;
88 	}
89 
90 	/* Cause the SATA device to do its early init */
91 	uclass_first_device(UCLASS_AHCI, &dev);
92 
93 #ifdef CONFIG_DM_PCI
94 	/* Trigger PCIe devices detection */
95 	pci_init();
96 #endif
97 
98 	return 0;
99 }
100