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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253/* SPDX-License-Identifier: GPL-2.0 */#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