Merge ../linux-2.6
[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/config.h>
16 #include <linux/string.h>
17 #include <asm/ppcboot.h>
18 #include <asm/ibm4xx.h>
19 #include <asm/reg.h>
20 #ifdef CONFIG_40x
21 #include <asm/io.h>
22 #endif
23
24 #if defined(CONFIG_BUBINGA)
25 #define BOARD_INFO_VECTOR       0xFFF80B50 /* openbios 1.19 moved this vector down  - armin */
26 #else
27 #define BOARD_INFO_VECTOR       0xFFFE0B50
28 #endif
29
30 #ifdef CONFIG_40x
31 /* Supply a default Ethernet address for those eval boards that don't
32  * ship with one.  This is an address from the MBX board I have, so
33  * it is unlikely you will find it on your network.
34  */
35 static  ushort  def_enet_addr[] = { 0x0800, 0x3e26, 0x1559 };
36
37 extern unsigned long timebase_period_ns;
38 #endif /* CONFIG_40x */
39
40 extern unsigned long decompress_kernel(unsigned long load_addr, int num_words,
41                                        unsigned long cksum);
42
43 /* We need to make sure that this is before the images to ensure
44  * that it's in a mapped location. */
45 bd_t hold_resid_buf __attribute__ ((__section__ (".data.boot")));
46 bd_t *hold_residual = &hold_resid_buf;
47
48 typedef struct openbios_board_info {
49         unsigned char    bi_s_version[4];       /* Version of this structure */
50         unsigned char    bi_r_version[30];      /* Version of the IBM ROM */
51         unsigned int     bi_memsize;            /* DRAM installed, in bytes */
52 #ifdef CONFIG_405EP
53         unsigned char    bi_enetaddr[2][6];     /* Local Ethernet MAC address */
54 #else /* CONFIG_405EP */
55         unsigned char    bi_enetaddr[6];        /* Local Ethernet MAC address */
56 #endif /* CONFIG_405EP */
57         unsigned char    bi_pci_enetaddr[6];    /* PCI Ethernet MAC address */
58         unsigned int     bi_intfreq;            /* Processor speed, in Hz */
59         unsigned int     bi_busfreq;            /* PLB Bus speed, in Hz */
60         unsigned int     bi_pci_busfreq;        /* PCI Bus speed, in Hz */
61 #ifdef CONFIG_405EP
62         unsigned int     bi_opb_busfreq;        /* OPB Bus speed, in Hz */
63         unsigned int     bi_pllouta_freq;       /* PLL OUTA speed, in Hz */
64 #endif /* CONFIG_405EP */
65 } openbios_bd_t;
66
67 void *
68 load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
69                 void *ign1, void *ign2)
70 {
71 #ifdef CONFIG_40x
72         openbios_bd_t *openbios_bd = NULL;
73         openbios_bd_t *(*get_board_info)(void) =
74                 (openbios_bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);
75
76         /*
77          * On 40x platforms we not only need the MAC-addresses, but also the
78          * clocks and memsize. Now try to get all values using the OpenBIOS
79          * "get_board_info()" callback.
80          */
81         if ((openbios_bd = get_board_info()) != NULL) {
82                 /*
83                  * Copy bd_info from OpenBIOS struct into U-Boot struct
84                  * used by kernel
85                  */
86                 hold_residual->bi_memsize = openbios_bd->bi_memsize;
87                 hold_residual->bi_intfreq = openbios_bd->bi_intfreq;
88                 hold_residual->bi_busfreq = openbios_bd->bi_busfreq;
89                 hold_residual->bi_pci_busfreq = openbios_bd->bi_pci_busfreq;
90                 memcpy(hold_residual->bi_pci_enetaddr, openbios_bd->bi_pci_enetaddr, 6);
91 #ifdef CONFIG_405EP
92                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr[0], 6);
93                 memcpy(hold_residual->bi_enet1addr, openbios_bd->bi_enetaddr[1], 6);
94                 hold_residual->bi_opbfreq = openbios_bd->bi_opb_busfreq;
95                 hold_residual->bi_procfreq = openbios_bd->bi_pllouta_freq;
96 #else /* CONFIG_405EP */
97                 memcpy(hold_residual->bi_enetaddr, openbios_bd->bi_enetaddr, 6);
98 #endif /* CONFIG_405EP */
99         } else {
100                 /* Hmmm...better try to stuff some defaults.
101                  */
102                 hold_residual->bi_memsize = 16 * 1024 * 1024;
103                 hold_residual->bi_intfreq = 200000000;
104                 hold_residual->bi_busfreq = 100000000;
105                 hold_residual->bi_pci_busfreq = 66666666;
106
107                 /*
108                  * Only supply one mac-address in this fallback
109                  */
110                 memcpy(hold_residual->bi_enetaddr, (void *)def_enet_addr, 6);
111 #ifdef CONFIG_405EP
112                 hold_residual->bi_opbfreq = 50000000;
113                 hold_residual->bi_procfreq = 200000000;
114 #endif /* CONFIG_405EP */
115         }
116
117         timebase_period_ns = 1000000000 / hold_residual->bi_intfreq;
118 #endif /* CONFIG_40x */
119
120 #ifdef CONFIG_440GP
121         /* simply copy the MAC addresses */
122         memcpy(hold_residual->bi_enetaddr,  (char *)OPENBIOS_MAC_BASE, 6);
123         memcpy(hold_residual->bi_enet1addr, (char *)(OPENBIOS_MAC_BASE+OPENBIOS_MAC_OFFSET), 6);
124 #endif /* CONFIG_440GP */
125
126         decompress_kernel(load_addr, num_words, cksum);
127
128         return (void *)hold_residual;
129 }