https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 33cc938e65a98f1d29d0a18403dbbee050dcad9a authored by Linus Torvalds on 03 December 2023, 09:52:56 UTC
Linux 6.7-rc4
Linux 6.7-rc4
Tip revision: 33cc938
mc6821.h
/* 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