1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * (C) Copyright 2018  Cisco Systems, Inc.
4  *
5  * Author: Thomas Fitzsimmons <fitzsim@fitzsim.org>
6  *
7  * Configuration settings for the Broadcom BCMSTB SoC family.
8  */
9 
10 #ifndef __BCMSTB_H
11 #define __BCMSTB_H
12 
13 #include <linux/sizes.h>
14 
15 #ifndef __ASSEMBLY__
16 
17 #include <linux/stringify.h>
18 #include <linux/types.h>
19 
20 struct bcmstb_boot_parameters {
21 	u32 r0;
22 	u32 r1;
23 	u32 r2;
24 	u32 r3;
25 	u32 sp;
26 	u32 lr;
27 };
28 
29 extern struct bcmstb_boot_parameters bcmstb_boot_parameters;
30 
31 extern phys_addr_t prior_stage_fdt_address;
32 
33 #endif /* __ASSEMBLY__ */
34 
35 /*
36  * CPU configuration.
37  */
38 
39 /*
40  * Memory configuration.
41  *
42  * The prior stage BOLT bootloader sets up memory for us.
43  *
44  * An example boot memory layout after loading everything is:
45  *
46  *	 0x0000 8000	vmlinux.bin.gz
47  *	       :	[~31 MiB uncompressed max]
48  *	 0x01ef f000	FIT containing signed public key
49  *	       :	[~2 KiB in size]
50  *	 0x01f0 0000	DTB copied from prior-stage-provided region
51  *	       :	[~1 MiB max]
52  *	 0x0200 0000	FIT containing ramdisk and device tree
53  *             :	  initramfs.cpio.gz
54  *	       :	  [~208 MiB uncompressed max, to CMA/bmem low address]
55  *	       :	  [~80 MiB compressed max, to PSB low address]
56  *             :	  device tree binary
57  *             :	  [~60 KiB]
58  *	 0x0700 0000	Prior stage bootloader (PSB)
59  *	       :
60  *	 0x0761 7000	Prior-stage-provided device tree binary (DTB)
61  *	       :	[~40 KiB in size]
62  *	 0x0f00 0000	Contiguous memory allocator (CMA/bmem) low address
63  *	       :
64  *	 0x8010 0000	U-Boot code at ELF load address
65  *	       :	[~500 KiB in size, stripped]
66  *	 0xc000 0000	Top of RAM
67  *
68  * Setting gd->relocaddr to CONFIG_SYS_TEXT_BASE in dram_init_banksize
69  * prevents U-Boot from relocating itself when it is run as an ELF
70  * program by the prior stage bootloader.
71  *
72  * We want to keep the ramdisk and FDT in the FIT image in-place, to
73  * accommodate stblinux's bmem and CMA regions.  To accomplish this,
74  * we set initrd_high and fdt_high to 0xffffffff, and the load and
75  * entry addresses of the FIT ramdisk entry to 0x0.
76  *
77  * Overwriting the prior stage bootloader causes memory instability,
78  * so the compressed initramfs needs to fit between the load address
79  * and the PSB low address.  In BOLT's default configuration this
80  * limits the compressed size of the initramfs to approximately 80
81  * MiB.  However, BOLT can be configured to allow loading larger
82  * initramfs images, in which case this limitation is eliminated.
83  */
84 #define CONFIG_SYS_SDRAM_BASE		0x00000000
85 #define CONFIG_SYS_INIT_RAM_SIZE	0x100000
86 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_INIT_RAM_ADDR +	\
87 					 CONFIG_SYS_INIT_RAM_SIZE -	\
88 					 GENERATED_GBL_DATA_SIZE)
89 
90 /*
91  * CONFIG_SYS_LOAD_ADDR - 1 MiB.
92  */
93 #define CONFIG_SYS_FDT_SAVE_ADDRESS	0x1f00000
94 #define CONFIG_SYS_CBSIZE		512
95 #define CONFIG_SYS_MAXARGS		32
96 
97 /*
98  * Large kernel image bootm configuration.
99  */
100 #define CONFIG_SYS_BOOTM_LEN		SZ_64M
101 
102 /*
103  * NS16550 configuration.
104  */
105 #define V_NS16550_CLK			81000000
106 
107 #define CONFIG_SYS_NS16550
108 #define CONFIG_SYS_NS16550_SERIAL
109 #define CONFIG_SYS_NS16550_REG_SIZE	(-4)
110 #define CONFIG_SYS_NS16550_CLK		V_NS16550_CLK
111 
112 /*
113  * Serial console configuration.
114  */
115 #define CONFIG_SYS_BAUDRATE_TABLE	{4800, 9600, 19200, 38400, 57600, \
116 					 115200}
117 
118 /*
119  * Informational display configuration.
120  */
121 
122 /*
123  * Command configuration.
124  */
125 
126 /*
127  * Flash configuration.
128  */
129 #define CONFIG_SPI_FLASH_STMICRO
130 #define CONFIG_SPI_FLASH_MACRONIX
131 
132 /*
133  * Filesystem configuration.
134  */
135 #define CONFIG_DOS_PARTITION
136 
137 /*
138  * Environment configuration.
139  */
140 
141 /*
142  * Save the prior stage provided DTB.
143  */
144 /*
145  * Enable in-place RFS with this initrd_high setting.
146  */
147 #define CONFIG_EXTRA_ENV_SETTINGS					\
148 	"fdtsaveaddr=" __stringify(CONFIG_SYS_FDT_SAVE_ADDRESS) "\0"	\
149 	"initrd_high=0xffffffff\0"					\
150 	"fdt_high=0xffffffff\0"
151 
152 /*
153  * Set fdtaddr to prior stage-provided DTB in board_late_init, when
154  * writeable environment is available.
155  */
156 
157 #endif /* __BCMSTB_H */
158