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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/mc6821.h | |
download | linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-stable-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/linux/mc6821.h')
-rw-r--r-- | include/linux/mc6821.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/include/linux/mc6821.h b/include/linux/mc6821.h new file mode 100644 index 000000000000..28e301e295da --- /dev/null +++ b/include/linux/mc6821.h @@ -0,0 +1,51 @@ +#ifndef _MC6821_H_ +#define _MC6821_H_ + +/* + * This file describes the memery mapping of the MC6821 PIA. + * The unions describe overlayed registers. Which of them is used is + * determined by bit 2 of the corresponding control register. + * this files expects the PIA_REG_PADWIDTH to be defined the numeric + * value of the register spacing. + * + * Data came from MFC-31-Developer Kit (from Ralph Seidel, + * zodiac@darkness.gun.de) and Motorola Data Sheet (from + * Richard Hirst, srh@gpt.co.uk) + * + * 6.11.95 copyright Joerg Dorchain (dorchain@mpi-sb.mpg.de) + * + */ + +#ifndef PIA_REG_PADWIDTH +#define PIA_REG_PADWIDTH 255 +#endif + +struct pia { + union { + volatile u_char pra; + volatile u_char ddra; + } ua; + u_char pad1[PIA_REG_PADWIDTH]; + volatile u_char cra; + u_char pad2[PIA_REG_PADWIDTH]; + union { + volatile u_char prb; + volatile u_char ddrb; + } ub; + u_char pad3[PIA_REG_PADWIDTH]; + volatile u_char crb; + u_char pad4[PIA_REG_PADWIDTH]; +}; + +#define ppra ua.pra +#define pddra ua.ddra +#define pprb ub.prb +#define pddrb ub.ddrb + +#define PIA_C1_ENABLE_IRQ (1<<0) +#define PIA_C1_LOW_TO_HIGH (1<<1) +#define PIA_DDR (1<<2) +#define PIA_IRQ2 (1<<6) +#define PIA_IRQ1 (1<<7) + +#endif |