Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[linux-2.6] / arch / ppc / boot / simple / openbios.c
1 /*
2  * Copyright (c) 2005 DENX Software Engineering
3  * Stefan Roese <sr@denx.de>
4  *
5  * Based on original work by
6  *      2005 (c) SYSGO AG - g.jaeger@sysgo.com
7  *
8  * This file is licensed under the terms of the GNU General Public
9  * License version 2.  This program is licensed "as is" without
10  * any warranty of any kind, whether express or implied.
11  *
12  */
13
14 #include <linux/types.h>
15 #include <linux/string.h>
16 #include <asm/ppcboot.h>
17 #include <asm/ibm4xx.h>
18 #include <asm/reg.h>
19 #ifdef CONFIG_40x
20 #include <asm/io.h>
21 #endif
22
23 #if defined(CONFIG_BUBINGA)
24 #define BOARD_INFO_VECTOR       0xFFF80B50 /* openbios 1.19 moved this vector down  - armin */
25 #else
26 #define BOARD_INFO_VECTOR       0xFFFE0B50
27 #endif
28
29 #ifdef CONFIG_40x
30 /* Supply a default Ethernet address for those eval boards that don't
31  * ship with one.  This is an address from the MBX board I have, so
32  * it is unlikely you will find it on your network.
33  */
34 static  ushort  def_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };
35
36 extern unsigned long timebase_period_ns;
37 #endif /* CONFIG_40x */
38
39 extern unsigned long decompress_kernel(unsigned long load_addr, int num_words,
40                                        unsigned long cksum);
41
42 /* We need to make sure that this is before the images to ensure
43  * that it's in a mapped location. */
44 bd_t hold_resid_buf __attribute__ ((__section__ (".data.boot")));
45 bd_t *hold_residual = &hold_resid_buf;
46
47 typedef struct openbios_board_info {
48         unsigned char    bi_s_version[4];       /* Version of this structure */
49         unsigned char    bi_r_version[30];      /* Version of the IBM ROM */
50         unsigned int     bi_memsize;            /* DRAM installed, in bytes */
51 #ifdef CONFIG_405EP
52         unsigned char    bi_enetaddr[2][6];     /* Local Ethernet MAC address */
53 #else /* CONFIG_405EP */
54         unsigned char    bi_enetaddr[6];        /* Local Ethernet MAC address */
55 #endif /* CONFIG_405EP */
56         unsigned char    bi_pci_enetaddr[6];    /* PCI Ethernet MAC address */
57         unsigned int     bi_intfreq;            /* Processor speed, in Hz */
58         unsigned int     bi_busfreq;            /* PLB Bus speed, in Hz */
59         unsigned int     bi_pci_busfreq;        /* PCI Bus speed, in Hz */
60 #ifdef CONFIG_405EP
61         unsigned int     bi_opb_busfreq;        /* OPB Bus speed, in Hz */
62         unsigned int     bi_pllouta_freq;       /* PLL OUTA speed, in Hz */
63 #endif /* CONFIG_405EP */
64 } openbios_bd_t;
65
66 void *
67 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
68                 void *ign1, void *ign2)
69 {
70 #ifdef CONFIG_40x
71         openbios_bd_t *openbios_bd = NULL;
72         openbios_bd_t *(*get_board_info)(void) =
73                 (openbios_bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);
74
75         /*
76          * On 40x platforms we not only need the MAC-addresses, but also the
77          * clocks and memsize. Now try to get all values using the OpenBIOS
78          * "get_board_info()" callback.
79          */
80         if ((openbios_bd = get_board_info()) != NULL) {
81                 /*
82                  * Copy bd_info from OpenBIOS struct into U-Boot struct
83                  * used by kernel
84                  */
85                 hold_residual->bi_memsize = openbios_bd->bi_memsize;
86                 hold_residual->bi_intfreq = openbios_bd->bi_intfreq;
87                 hold_residual->bi_busfreq = openbios_bd->bi_busfreq;
88                 hold_residual->bi_pci_busfreq = openbios_bd->bi_pci_busfreq;
89                 memcpy(hold_residual->bi_pci_enetaddr, openbios_bd->bi_pci_enetaddr, 6);
90 #ifdef CONFIG_405EP
91                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr[0], 6);
92                 memcpy(hold_residual->bi_enet1addr, openbios_bd->bi_enetaddr[1], 6);
93                 hold_residual->bi_opbfreq = openbios_bd->bi_opb_busfreq;
94                 hold_residual->bi_procfreq = openbios_bd->bi_pllouta_freq;
95 #else /* CONFIG_405EP */
96                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr, 6);
97 #endif /* CONFIG_405EP */
98         } else {
99                 /* Hmmm...better try to stuff some defaults.
100                  */
101                 hold_residual->bi_memsize = 16 * 1024 * 1024;
102                 hold_residual->bi_intfreq = 200000000;
103                 hold_residual->bi_busfreq = 100000000;
104                 hold_residual->bi_pci_busfreq = 66666666;
105
106                 /*
107                  * Only supply one mac-address in this fallback
108                  */
109                 memcpy(hold_residual->bi_enetaddr, (void *)def_enet_addr, 6);
110 #ifdef CONFIG_405EP
111                 hold_residual->bi_opbfreq = 50000000;
112                 hold_residual->bi_procfreq = 200000000;
113 #endif /* CONFIG_405EP */
114         }
115
116         timebase_period_ns = 1000000000 / hold_residual->bi_intfreq;
117 #endif /* CONFIG_40x */
118
119 #ifdef CONFIG_440GP
120         /* simply copy the MAC addresses */
121         memcpy(hold_residual->bi_enetaddr,  (char *)OPENBIOS_MAC_BASE, 6);
122         memcpy(hold_residual->bi_enet1addr, (char *)(OPENBIOS_MAC_BASE+OPENBIOS_MAC_OFFSET), 6);
123 #endif /* CONFIG_440GP */
124
125         decompress_kernel(load_addr, num_words, cksum);
126
127         return (void *)hold_residual;
128 }