2 * Functions for setting up and using a MPC106 northbridge
3 * Extracted from arch/powerpc/platforms/powermac/pci.c.
5 * Copyright (C) 2003 Benjamin Herrenschmuidt (benh@kernel.crashing.org)
6 * Copyright (C) 1997 Paul Mackerras (paulus@samba.org)
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
13 #include <linux/kernel.h>
14 #include <linux/pci.h>
15 #include <linux/init.h>
19 #include <asm/pci-bridge.h>
20 #include <asm/grackle.h>
22 #define GRACKLE_CFA(b, d, o) (0x80 | ((b) << 8) | ((d) << 16) \
25 #define GRACKLE_PICR1_STG 0x00000040
26 #define GRACKLE_PICR1_LOOPSNOOP 0x00000010
28 /* N.B. this is called before bridges is initialized, so we can't
29 use grackle_pcibios_{read,write}_config_dword. */
30 static inline void grackle_set_stg(struct pci_controller
* bp
, int enable
)
34 out_be32(bp
->cfg_addr
, GRACKLE_CFA(0, 0, 0xa8));
35 val
= in_le32(bp
->cfg_data
);
36 val
= enable
? (val
| GRACKLE_PICR1_STG
) :
37 (val
& ~GRACKLE_PICR1_STG
);
38 out_be32(bp
->cfg_addr
, GRACKLE_CFA(0, 0, 0xa8));
39 out_le32(bp
->cfg_data
, val
);
40 (void)in_le32(bp
->cfg_data
);
43 static inline void grackle_set_loop_snoop(struct pci_controller
*bp
, int enable
)
47 out_be32(bp
->cfg_addr
, GRACKLE_CFA(0, 0, 0xa8));
48 val
= in_le32(bp
->cfg_data
);
49 val
= enable
? (val
| GRACKLE_PICR1_LOOPSNOOP
) :
50 (val
& ~GRACKLE_PICR1_LOOPSNOOP
);
51 out_be32(bp
->cfg_addr
, GRACKLE_CFA(0, 0, 0xa8));
52 out_le32(bp
->cfg_data
, val
);
53 (void)in_le32(bp
->cfg_data
);
56 void __init
setup_grackle(struct pci_controller
*hose
)
58 setup_indirect_pci(hose
, 0xfec00000, 0xfee00000);
59 if (machine_is_compatible("AAPL,PowerBook1998"))
60 grackle_set_loop_snoop(hose
, 1);
61 #if 0 /* Disabled for now, HW problems ??? */
62 grackle_set_stg(hose
, 1);
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