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 #ifndef __ASSEMBLY__
13 #include <asm/arch/base.h>
14 #endif
15 
16 #if defined(CONFIG_TARGET_RPI_2) || defined(CONFIG_TARGET_RPI_3_32B)
17 #define CONFIG_SKIP_LOWLEVEL_INIT
18 #endif
19 
20 /* Architecture, CPU, etc.*/
21 
22 /* Use SoC timer for AArch32, but architected timer for AArch64 */
23 #ifndef CONFIG_ARM64
24 #define CONFIG_SYS_TIMER_RATE		1000000
25 #define CONFIG_SYS_TIMER_COUNTER	\
26 	(&((struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR)->clo)
27 #endif
28 
29 /*
30  * 2835 is a SKU in a series for which the 2708 is the first or primary SoC,
31  * so 2708 has historically been used rather than a dedicated 2835 ID.
32  *
33  * We don't define a machine type for bcm2709/bcm2836 since the RPi Foundation
34  * chose to use someone else's previously registered machine ID (3139, MX51_GGC)
35  * rather than obtaining a valid ID:-/
36  *
37  * For the bcm2837, hopefully a machine type is not needed, since everything
38  * is DT.
39  */
40 #ifdef CONFIG_BCM2835
41 #define CONFIG_MACH_TYPE		MACH_TYPE_BCM2708
42 #endif
43 
44 /* Memory layout */
45 #define CONFIG_SYS_SDRAM_BASE		0x00000000
46 #define CONFIG_SYS_UBOOT_BASE		CONFIG_SYS_TEXT_BASE
47 /*
48  * The board really has 256M. However, the VC (VideoCore co-processor) shares
49  * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
50  * smaller amount of RAM is present in order to avoid stomping on the area
51  * the VC uses.
52  */
53 #define CONFIG_SYS_SDRAM_SIZE		SZ_128M
54 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + \
55 					 CONFIG_SYS_SDRAM_SIZE - \
56 					 GENERATED_GBL_DATA_SIZE)
57 #define CONFIG_SYS_MALLOC_LEN		SZ_4M
58 #define CONFIG_LOADADDR			0x00200000
59 
60 #ifdef CONFIG_ARM64
61 #define CONFIG_SYS_BOOTM_LEN		SZ_64M
62 #endif
63 
64 /* Devices */
65 /* GPIO */
66 #define CONFIG_BCM2835_GPIO
67 /* LCD */
68 #define CONFIG_LCD_DT_SIMPLEFB
69 #define CONFIG_VIDEO_BCM2835
70 
71 #ifdef CONFIG_CMD_USB
72 #define CONFIG_TFTP_TSIZE
73 #endif
74 
75 /* DFU over USB/UDC */
76 #ifdef CONFIG_CMD_DFU
77 #define CONFIG_SYS_DFU_DATA_BUF_SIZE	SZ_1M
78 #define CONFIG_SYS_DFU_MAX_FILE_SIZE	SZ_2M
79 
80 #ifdef CONFIG_ARM64
81 #define KERNEL_FILENAME		"Image"
82 #else
83 #define KERNEL_FILENAME		"zImage"
84 #endif
85 
86 #define ENV_DFU_SETTINGS \
87 	"dfu_alt_info=u-boot.bin fat 0 1;uboot.env fat 0 1;" \
88 		      "config.txt fat 0 1;" \
89 		      KERNEL_FILENAME " fat 0 1\0"
90 #else
91 #define ENV_DFU_SETTINGS ""
92 #endif
93 
94 /* Console configuration */
95 #define CONFIG_SYS_CBSIZE		1024
96 
97 /* Environment */
98 #define CONFIG_SYS_LOAD_ADDR		0x1000000
99 
100 /* Shell */
101 
102 /* ATAGs support for bootm/bootz */
103 #define CONFIG_SETUP_MEMORY_TAGS
104 #define CONFIG_CMDLINE_TAG
105 #define CONFIG_INITRD_TAG
106 
107 /* Environment */
108 #define ENV_DEVICE_SETTINGS \
109 	"stdin=serial,usbkbd\0" \
110 	"stdout=serial,vidconsole\0" \
111 	"stderr=serial,vidconsole\0"
112 
113 #ifdef CONFIG_ARM64
114 #define FDT_HIGH "ffffffffffffffff"
115 #define INITRD_HIGH "ffffffffffffffff"
116 #else
117 #define FDT_HIGH "ffffffff"
118 #define INITRD_HIGH "ffffffff"
119 #endif
120 
121 /*
122  * Memory layout for where various images get loaded by boot scripts:
123  *
124  * I suspect address 0 is used as the SMP pen on the RPi2, so avoid this.
125  *
126  * Older versions of the boot firmware place the firmware-loaded DTB at 0x100,
127  * newer versions place it in high memory. So prevent U-Boot from doing its own
128  * DTB + initrd relocation so that we won't accidentally relocate the initrd
129  * over the firmware-loaded DTB and generally try to lay out things starting
130  * from the bottom of RAM.
131  *
132  * kernel_addr_r has different constraints on ARM and Aarch64.  For 32-bit ARM,
133  * it must be within the first 128M of RAM in order for the kernel's
134  * CONFIG_AUTO_ZRELADDR option to work. The kernel itself will be decompressed
135  * to 0x8000 but the decompressor clobbers 0x4000-0x8000 as well. The
136  * decompressor also likes to relocate itself to right past the end of the
137  * decompressed kernel, so in total the sum of the compressed and and
138  * decompressed kernel needs to be reserved.
139  *
140  *   For Aarch64, the kernel image is uncompressed and must be loaded at
141  *   text_offset bytes (specified in the header of the Image) into a 2MB
142  *   boundary. The 'booti' command relocates the image if necessary. Linux uses
143  *   a default text_offset of 0x80000.  In summary, loading at 0x80000
144  *   satisfies all these constraints and reserving memory up to 0x02400000
145  *   permits fairly large (roughly 36M) kernels.
146  *
147  * scriptaddr and pxefile_addr_r can be pretty much anywhere that doesn't
148  * conflict with something else. Reserving 1M for each of them at
149  * 0x02400000-0x02500000 and 0x02500000-0x02600000 should be plenty.
150  *
151  * On ARM, both the DTB and any possible initrd must be loaded such that they
152  * fit inside the lowmem mapping in Linux. In practice, this usually means not
153  * more than ~700M away from the start of the kernel image but this number can
154  * be larger OR smaller depending on e.g. the 'vmalloc=xxxM' command line
155  * parameter given to the kernel. So reserving memory from low to high
156  * satisfies this constraint again. Reserving 1M at 0x02600000-0x02700000 for
157  * the DTB leaves rest of the free RAM to the initrd starting at 0x02700000.
158  * Even with the smallest possible CPU-GPU memory split of the CPU getting
159  * only 64M, the remaining 25M starting at 0x02700000 should allow quite
160  * large initrds before they start colliding with U-Boot.
161  */
162 #define ENV_MEM_LAYOUT_SETTINGS \
163 	"fdt_high=" FDT_HIGH "\0" \
164 	"initrd_high=" INITRD_HIGH "\0" \
165 	"kernel_addr_r=0x00080000\0" \
166 	"scriptaddr=0x02400000\0" \
167 	"pxefile_addr_r=0x02500000\0" \
168 	"fdt_addr_r=0x02600000\0" \
169 	"ramdisk_addr_r=0x02700000\0"
170 
171 #if CONFIG_IS_ENABLED(CMD_MMC)
172 	#define BOOT_TARGET_MMC(func) \
173 		func(MMC, mmc, 0) \
174 		func(MMC, mmc, 1)
175 #else
176 	#define BOOT_TARGET_MMC(func)
177 #endif
178 
179 #if CONFIG_IS_ENABLED(CMD_USB)
180 	#define BOOT_TARGET_USB(func) func(USB, usb, 0)
181 #else
182 	#define BOOT_TARGET_USB(func)
183 #endif
184 
185 #if CONFIG_IS_ENABLED(CMD_PXE)
186 	#define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
187 #else
188 	#define BOOT_TARGET_PXE(func)
189 #endif
190 
191 #if CONFIG_IS_ENABLED(CMD_DHCP)
192 	#define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
193 #else
194 	#define BOOT_TARGET_DHCP(func)
195 #endif
196 
197 #define BOOT_TARGET_DEVICES(func) \
198 	BOOT_TARGET_MMC(func) \
199 	BOOT_TARGET_USB(func) \
200 	BOOT_TARGET_PXE(func) \
201 	BOOT_TARGET_DHCP(func)
202 
203 #include <config_distro_bootcmd.h>
204 
205 #define CONFIG_EXTRA_ENV_SETTINGS \
206 	"dhcpuboot=usb start; dhcp u-boot.uimg; bootm\0" \
207 	ENV_DEVICE_SETTINGS \
208 	ENV_DFU_SETTINGS \
209 	ENV_MEM_LAYOUT_SETTINGS \
210 	BOOTENV
211 
212 
213 #endif
214