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 "version.h"
14 #include <linux/sizes.h>
15 
16 #ifndef __ASSEMBLY__
17 
18 #include <linux/stringify.h>
19 #include <linux/types.h>
20 
21 struct bcmstb_boot_parameters {
22 	u32 r0;
23 	u32 r1;
24 	u32 r2;
25 	u32 r3;
26 	u32 sp;
27 	u32 lr;
28 };
29 
30 extern struct bcmstb_boot_parameters bcmstb_boot_parameters;
31 
32 extern phys_addr_t prior_stage_fdt_address;
33 
34 #endif /* __ASSEMBLY__ */
35 
36 /*
37  * CPU configuration.
38  */
39 #define CONFIG_SKIP_LOWLEVEL_INIT
40 
41 /*
42  * Memory configuration.
43  *
44  * The prior stage BOLT bootloader sets up memory for us.
45  *
46  * An example boot memory layout after loading everything is:
47  *
48  *	 0x0000 8000	vmlinux.bin.gz
49  *	       :	[~31 MiB uncompressed max]
50  *	 0x01ef f000	FIT containing signed public key
51  *	       :	[~2 KiB in size]
52  *	 0x01f0 0000	DTB copied from prior-stage-provided region
53  *	       :	[~1 MiB max]
54  *	 0x0200 0000	FIT containing ramdisk and device tree
55  *             :	  initramfs.cpio.gz
56  *	       :	  [~208 MiB uncompressed max, to CMA/bmem low address]
57  *	       :	  [~80 MiB compressed max, to PSB low address]
58  *             :	  device tree binary
59  *             :	  [~60 KiB]
60  *	 0x0700 0000	Prior stage bootloader (PSB)
61  *	       :
62  *	 0x0761 7000	Prior-stage-provided device tree binary (DTB)
63  *	       :	[~40 KiB in size]
64  *	 0x0f00 0000	Contiguous memory allocator (CMA/bmem) low address
65  *	       :
66  *	 0x8010 0000	U-Boot code at ELF load address
67  *	       :	[~500 KiB in size, stripped]
68  *	 0xc000 0000	Top of RAM
69  *
70  * Setting gd->relocaddr to CONFIG_SYS_TEXT_BASE in dram_init_banksize
71  * prevents U-Boot from relocating itself when it is run as an ELF
72  * program by the prior stage bootloader.
73  *
74  * We want to keep the ramdisk and FDT in the FIT image in-place, to
75  * accommodate stblinux's bmem and CMA regions.  To accomplish this,
76  * we set initrd_high and fdt_high to 0xffffffff, and the load and
77  * entry addresses of the FIT ramdisk entry to 0x0.
78  *
79  * Overwriting the prior stage bootloader causes memory instability,
80  * so the compressed initramfs needs to fit between the load address
81  * and the PSB low address.  In BOLT's default configuration this
82  * limits the compressed size of the initramfs to approximately 80
83  * MiB.  However, BOLT can be configured to allow loading larger
84  * initramfs images, in which case this limitation is eliminated.
85  */
86 #define CONFIG_SYS_SDRAM_BASE		0x00000000
87 #define CONFIG_SYS_INIT_RAM_SIZE	0x100000
88 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_INIT_RAM_ADDR +	\
89 					 CONFIG_SYS_INIT_RAM_SIZE -	\
90 					 GENERATED_GBL_DATA_SIZE)
91 #define CONFIG_SYS_LOAD_ADDR		0x2000000
92 
93 /*
94  * CONFIG_SYS_LOAD_ADDR - 1 MiB.
95  */
96 #define CONFIG_SYS_FDT_SAVE_ADDRESS	0x1f00000
97 #define CONFIG_SYS_CBSIZE		512
98 #define CONFIG_SYS_MAXARGS		32
99 
100 /*
101  * Large kernel image bootm configuration.
102  */
103 #define CONFIG_SYS_BOOTM_LEN		SZ_64M
104 
105 /*
106  * NS16550 configuration.
107  */
108 #define V_NS16550_CLK			81000000
109 
110 #define CONFIG_SYS_NS16550
111 #define CONFIG_SYS_NS16550_SERIAL
112 #define CONFIG_SYS_NS16550_REG_SIZE	(-4)
113 #define CONFIG_SYS_NS16550_CLK		V_NS16550_CLK
114 
115 /*
116  * Serial console configuration.
117  */
118 #define CONFIG_SYS_BAUDRATE_TABLE	{4800, 9600, 19200, 38400, 57600, \
119 					 115200}
120 
121 /*
122  * Informational display configuration.
123  */
124 #define CONFIG_REVISION_TAG
125 
126 /*
127  * Command configuration.
128  */
129 
130 /*
131  * Flash configuration.
132  */
133 #define CONFIG_ST_SMI
134 #define CONFIG_SPI_FLASH_STMICRO
135 #define CONFIG_SPI_FLASH_MACRONIX
136 
137 /*
138  * Filesystem configuration.
139  */
140 #define CONFIG_DOS_PARTITION
141 
142 /*
143  * Environment configuration.
144  */
145 
146 /*
147  * Save the prior stage provided DTB.
148  */
149 /*
150  * Enable in-place RFS with this initrd_high setting.
151  */
152 #define CONFIG_EXTRA_ENV_SETTINGS					\
153 	"fdtsaveaddr=" __stringify(CONFIG_SYS_FDT_SAVE_ADDRESS) "\0"	\
154 	"initrd_high=0xffffffff\0"					\
155 	"fdt_high=0xffffffff\0"
156 
157 /*
158  * Set fdtaddr to prior stage-provided DTB in board_late_init, when
159  * writeable environment is available.
160  */
161 
162 #endif /* __BCMSTB_H */
163