Merge with http://kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[linux-2.6] / arch / ppc / boot / simple / openbios.c
1 /*
2  * arch/ppc/boot/simple/openbios.c
3  *
4  * Copyright (c) 2005 DENX Software Engineering
5  * Stefan Roese <sr@denx.de>
6  *
7  * Based on original work by
8  *      2005 (c) SYSGO AG - g.jaeger@sysgo.com
9  *
10  * This file is licensed under the terms of the GNU General Public
11  * License version 2.  This program is licensed "as is" without
12  * any warranty of any kind, whether express or implied.
13  *
14  */
15
16 #include <linux/types.h>
17 #include <linux/config.h>
18 #include <linux/string.h>
19 #include <asm/ppcboot.h>
20 #include <asm/ibm4xx.h>
21 #include <asm/reg.h>
22 #ifdef CONFIG_40x
23 #include <asm/io.h>
24 #endif
25
26 #if defined(CONFIG_BUBINGA)
27 #define BOARD_INFO_VECTOR       0xFFF80B50 /* openbios 1.19 moved this vector down  - armin */
28 #else
29 #define BOARD_INFO_VECTOR       0xFFFE0B50
30 #endif
31
32 #ifdef CONFIG_40x
33 /* Supply a default Ethernet address for those eval boards that don't
34  * ship with one.  This is an address from the MBX board I have, so
35  * it is unlikely you will find it on your network.
36  */
37 static  ushort  def_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };
38
39 extern unsigned long timebase_period_ns;
40 #endif /* CONFIG_40x */
41
42 extern unsigned long decompress_kernel(unsigned long load_addr, int num_words,
43                                        unsigned long cksum);
44
45 /* We need to make sure that this is before the images to ensure
46  * that it's in a mapped location. */
47 bd_t hold_resid_buf __attribute__ ((__section__ (".data.boot")));
48 bd_t *hold_residual = &hold_resid_buf;
49
50 typedef struct openbios_board_info {
51         unsigned char    bi_s_version[4];       /* Version of this structure */
52         unsigned char    bi_r_version[30];      /* Version of the IBM ROM */
53         unsigned int     bi_memsize;            /* DRAM installed, in bytes */
54 #ifdef CONFIG_405EP
55         unsigned char    bi_enetaddr[2][6];     /* Local Ethernet MAC address */
56 #else /* CONFIG_405EP */
57         unsigned char    bi_enetaddr[6];        /* Local Ethernet MAC address */
58 #endif /* CONFIG_405EP */
59         unsigned char    bi_pci_enetaddr[6];    /* PCI Ethernet MAC address */
60         unsigned int     bi_intfreq;            /* Processor speed, in Hz */
61         unsigned int     bi_busfreq;            /* PLB Bus speed, in Hz */
62         unsigned int     bi_pci_busfreq;        /* PCI Bus speed, in Hz */
63 #ifdef CONFIG_405EP
64         unsigned int     bi_opb_busfreq;        /* OPB Bus speed, in Hz */
65         unsigned int     bi_pllouta_freq;       /* PLL OUTA speed, in Hz */
66 #endif /* CONFIG_405EP */
67 } openbios_bd_t;
68
69 void *
70 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
71                 void *ign1, void *ign2)
72 {
73 #ifdef CONFIG_40x
74         openbios_bd_t *openbios_bd = NULL;
75         openbios_bd_t *(*get_board_info)(void) =
76                 (openbios_bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);
77
78         /*
79          * On 40x platforms we not only need the MAC-addresses, but also the
80          * clocks and memsize. Now try to get all values using the OpenBIOS
81          * "get_board_info()" callback.
82          */
83         if ((openbios_bd = get_board_info()) != NULL) {
84                 /*
85                  * Copy bd_info from OpenBIOS struct into U-Boot struct
86                  * used by kernel
87                  */
88                 hold_residual->bi_memsize = openbios_bd->bi_memsize;
89                 hold_residual->bi_intfreq = openbios_bd->bi_intfreq;
90                 hold_residual->bi_busfreq = openbios_bd->bi_busfreq;
91                 hold_residual->bi_pci_busfreq = openbios_bd->bi_pci_busfreq;
92                 memcpy(hold_residual->bi_pci_enetaddr, openbios_bd->bi_pci_enetaddr, 6);
93 #ifdef CONFIG_405EP
94                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr[0], 6);
95                 memcpy(hold_residual->bi_enet1addr, openbios_bd->bi_enetaddr[1], 6);
96                 hold_residual->bi_opbfreq = openbios_bd->bi_opb_busfreq;
97                 hold_residual->bi_procfreq = openbios_bd->bi_pllouta_freq;
98 #else /* CONFIG_405EP */
99                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr, 6);
100 #endif /* CONFIG_405EP */
101         } else {
102                 /* Hmmm...better try to stuff some defaults.
103                  */
104                 hold_residual->bi_memsize = 16 * 1024 * 1024;
105                 hold_residual->bi_intfreq = 200000000;
106                 hold_residual->bi_busfreq = 100000000;
107                 hold_residual->bi_pci_busfreq = 66666666;
108
109                 /*
110                  * Only supply one mac-address in this fallback
111                  */
112                 memcpy(hold_residual->bi_enetaddr, (void *)def_enet_addr, 6);
113 #ifdef CONFIG_405EP
114                 hold_residual->bi_opbfreq = 50000000;
115                 hold_residual->bi_procfreq = 200000000;
116 #endif /* CONFIG_405EP */
117         }
118
119         timebase_period_ns = 1000000000 / hold_residual->bi_intfreq;
120 #endif /* CONFIG_40x */
121
122 #ifdef CONFIG_440GP
123         /* simply copy the MAC addresses */
124         memcpy(hold_residual->bi_enetaddr,  (char *)OPENBIOS_MAC_BASE, 6);
125         memcpy(hold_residual->bi_enet1addr, (char *)(OPENBIOS_MAC_BASE+OPENBIOS_MAC_OFFSET), 6);
126 #endif /* CONFIG_440GP */
127
128         decompress_kernel(load_addr, num_words, cksum);
129
130         return (void *)hold_residual;
131 }