]>
git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/powerpc/boot/simpleboot.c
2 * The simple platform -- for booting when firmware doesn't supply a device
3 * tree or any platform configuration information.
4 * All data is extracted from an embedded device tree
7 * Authors: Scott Wood <scottwood@freescale.com>
8 * Grant Likely <grant.likely@secretlab.ca>
10 * Copyright (c) 2007 Freescale Semiconductor, Inc.
11 * Copyright (c) 2008 Secret Lab Technologies Ltd.
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License version 2 as published
15 * by the Free Software Foundation.
26 extern int platform_specific_init(void) __attribute__((weak
));
28 void platform_init(unsigned long r3
, unsigned long r4
, unsigned long r5
,
29 unsigned long r6
, unsigned long r7
)
31 const u32
*na
, *ns
, *reg
, *timebase
;
35 /* Make sure FDT blob is sane */
36 if (fdt_check_header(_dtb_start
) != 0)
37 fatal("Invalid device tree blob\n");
39 /* Find the #address-cells and #size-cells properties */
40 node
= fdt_path_offset(_dtb_start
, "/");
42 fatal("Cannot find root node\n");
43 na
= fdt_getprop(_dtb_start
, node
, "#address-cells", &size
);
44 if (!na
|| (size
!= 4))
45 fatal("Cannot find #address-cells property");
46 ns
= fdt_getprop(_dtb_start
, node
, "#size-cells", &size
);
47 if (!ns
|| (size
!= 4))
48 fatal("Cannot find #size-cells property");
50 /* Find the memory range */
51 node
= fdt_node_offset_by_prop_value(_dtb_start
, -1, "device_type",
52 "memory", sizeof("memory"));
54 fatal("Cannot find memory node\n");
55 reg
= fdt_getprop(_dtb_start
, node
, "reg", &size
);
56 if (size
< (*na
+*ns
) * sizeof(u32
))
57 fatal("cannot get memory range\n");
59 /* Only interested in memory based at 0 */
60 for (i
= 0; i
< *na
; i
++)
62 fatal("Memory range is not based at address 0\n");
64 /* get the memsize and truncate it to under 4G on 32 bit machines */
66 for (i
= 0; i
< *ns
; i
++)
67 memsize64
= (memsize64
<< 32) | *reg
++;
68 if (sizeof(void *) == 4 && memsize64
>= 0x100000000ULL
)
69 memsize64
= 0xffffffff;
71 /* finally, setup the timebase */
72 node
= fdt_node_offset_by_prop_value(_dtb_start
, -1, "device_type",
73 "cpu", sizeof("cpu"));
75 fatal("Cannot find cpu node\n");
76 timebase
= fdt_getprop(_dtb_start
, node
, "timebase-frequency", &size
);
77 if (timebase
&& (size
== 4))
78 timebase_period_ns
= 1000000000 / *timebase
;
80 /* Now we have the memory size; initialize the heap */
81 simple_alloc_init(_end
, memsize64
- (unsigned long)_end
, 32, 64);
83 /* prepare the device tree and find the console */
86 if (platform_specific_init
)
87 platform_specific_init();
89 serial_console_init();