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1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * (C) Copyright 2012-2016 Stephen Warren
4  */
5 
6 #ifndef __CONFIG_H
7 #define __CONFIG_H
8 
9 #include <linux/sizes.h>
10 #include <asm/arch/timer.h>
11 
12 #if defined(CONFIG_TARGET_RPI_2) || defined(CONFIG_TARGET_RPI_3_32B)
13 #define CONFIG_SKIP_LOWLEVEL_INIT
14 #endif
15 
16 /* Architecture, CPU, etc.*/
17 #define CONFIG_ARCH_CPU_INIT
18 
19 /* Use SoC timer for AArch32, but architected timer for AArch64 */
20 #ifndef CONFIG_ARM64
21 #define CONFIG_SYS_TIMER_RATE		1000000
22 #define CONFIG_SYS_TIMER_COUNTER	\
23 	(&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
24 #endif
25 
26 /*
27  * 2835 is a SKU in a series for which the 2708 is the first or primary SoC,
28  * so 2708 has historically been used rather than a dedicated 2835 ID.
29  *
30  * We don't define a machine type for bcm2709/bcm2836 since the RPi Foundation
31  * chose to use someone else's previously registered machine ID (3139, MX51_GGC)
32  * rather than obtaining a valid ID:-/
33  *
34  * For the bcm2837, hopefully a machine type is not needed, since everything
35  * is DT.
36  */
37 #ifdef CONFIG_BCM2835
38 #define CONFIG_MACH_TYPE		MACH_TYPE_BCM2708
39 #endif
40 
41 /* Memory layout */
42 #define CONFIG_NR_DRAM_BANKS		1
43 #define CONFIG_SYS_SDRAM_BASE		0x00000000
44 #define CONFIG_SYS_UBOOT_BASE		CONFIG_SYS_TEXT_BASE
45 /*
46  * The board really has 256M. However, the VC (VideoCore co-processor) shares
47  * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
48  * smaller amount of RAM is present in order to avoid stomping on the area
49  * the VC uses.
50  */
51 #define CONFIG_SYS_SDRAM_SIZE		SZ_128M
52 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + \
53 					 CONFIG_SYS_SDRAM_SIZE - \
54 					 GENERATED_GBL_DATA_SIZE)
55 #define CONFIG_SYS_MALLOC_LEN		SZ_4M
56 #define CONFIG_SYS_MEMTEST_START	0x00100000
57 #define CONFIG_SYS_MEMTEST_END		0x00200000
58 #define CONFIG_LOADADDR			0x00200000
59 
60 /* Devices */
61 /* GPIO */
62 #define CONFIG_BCM2835_GPIO
63 /* LCD */
64 #define CONFIG_LCD_DT_SIMPLEFB
65 #define CONFIG_VIDEO_BCM2835
66 
67 #ifdef CONFIG_CMD_USB
68 #ifndef CONFIG_BCM2835
69 #define CONFIG_USB_DWC2_REG_ADDR 0x3f980000
70 #else
71 #define CONFIG_USB_DWC2_REG_ADDR 0x20980000
72 #endif
73 #define CONFIG_TFTP_TSIZE
74 #define CONFIG_MISC_INIT_R
75 #endif
76 
77 /* Console configuration */
78 #define CONFIG_SYS_CBSIZE		1024
79 
80 /* Environment */
81 #define CONFIG_ENV_SIZE			SZ_16K
82 #define CONFIG_SYS_LOAD_ADDR		0x1000000
83 #define CONFIG_PREBOOT			"usb start"
84 
85 /* Shell */
86 
87 /* ATAGs support for bootm/bootz */
88 #define CONFIG_SETUP_MEMORY_TAGS
89 #define CONFIG_CMDLINE_TAG
90 #define CONFIG_INITRD_TAG
91 
92 /* Environment */
93 #define ENV_DEVICE_SETTINGS \
94 	"stdin=serial,usbkbd\0" \
95 	"stdout=serial,vidconsole\0" \
96 	"stderr=serial,vidconsole\0"
97 
98 #ifdef CONFIG_ARM64
99 #define FDT_HIGH "ffffffffffffffff"
100 #define INITRD_HIGH "ffffffffffffffff"
101 #else
102 #define FDT_HIGH "ffffffff"
103 #define INITRD_HIGH "ffffffff"
104 #endif
105 
106 /*
107  * Memory layout for where various images get loaded by boot scripts:
108  *
109  * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
110  *
111  * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
112  * newer versions place it in high memory. So prevent U-Boot from doing its own
113  * DTB + initrd relocation so that we won't accidentally relocate the initrd
114  * over the firmware-loaded DTB and generally try to lay out things starting
115  * from the bottom of RAM.
116  *
117  * kernel_addr_r has different constraints on ARM and Aarch64.  For 32-bit ARM,
118  * it must be within the first 128M of RAM in order for the kernel's
119  * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
120  * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
121  * decompressor also likes to relocate itself to right past the end of the
122  * decompressed kernel, so in total the sum of the compressed and and
123  * decompressed kernel needs to be reserved.
124  *
125  *   For Aarch64, the kernel image is uncompressed and must be loaded at
126  *   text_offset bytes (specified in the header of the Image) into a 2MB
127  *   boundary. The 'booti' command relocates the image if necessary. Linux uses
128  *   a default text_offset of 0x80000.  In summary, loading at 0x80000
129  *   satisfies all these constraints and reserving memory up to 0x02400000
130  *   permits fairly large (roughly 36M) kernels.
131  *
132  * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
133  * conflict with something else. Reserving 1M for each of them at
134  * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
135  *
136  * On ARM, both the DTB and any possible initrd must be loaded such that they
137  * fit inside the lowmem mapping in Linux. In practice, this usually means not
138  * more than ~700M away from the start of the kernel image but this number can
139  * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
140  * parameter given to the kernel. So reserving memory from low to high
141  * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
142  * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
143  * Even with the smallest possible CPU-GPU memory split of the CPU getting
144  * only 64M, the remaining 25M starting at 0x02700000 should allow quite
145  * large initrds before they start colliding with U-Boot.
146  */
147 #define ENV_MEM_LAYOUT_SETTINGS \
148 	"fdt_high=" FDT_HIGH "\0" \
149 	"initrd_high=" INITRD_HIGH "\0" \
150 	"kernel_addr_r=0x00080000\0" \
151 	"scriptaddr=0x02400000\0" \
152 	"pxefile_addr_r=0x02500000\0" \
153 	"fdt_addr_r=0x02600000\0" \
154 	"ramdisk_addr_r=0x02700000\0"
155 
156 #define BOOT_TARGET_DEVICES(func) \
157 	func(MMC, mmc, 0) \
158 	func(USB, usb, 0) \
159 	func(PXE, pxe, na) \
160 	func(DHCP, dhcp, na)
161 #include <config_distro_bootcmd.h>
162 
163 #define CONFIG_EXTRA_ENV_SETTINGS \
164 	"dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
165 	"silent=1\0" \
166 	ENV_DEVICE_SETTINGS \
167 	ENV_MEM_LAYOUT_SETTINGS \
168 	BOOTENV
169 
170 
171 #endif
172