1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * linux/include/asm-arm/hardware/amba_kmi.h
5 * Internal header file for AMBA KMI ports
7 * Copyright (C) 2000 Deep Blue Solutions Ltd.
9 * ---------------------------------------------------------------------------
10 * From ARM PrimeCell(tm) PS2 Keyboard/Mouse Interface (PL050) Technical
11 * Reference Manual - ARM DDI 0143B - see http://www.arm.com/
12 * ---------------------------------------------------------------------------
14 #ifndef ASM_ARM_HARDWARE_AMBA_KMI_H
15 #define ASM_ARM_HARDWARE_AMBA_KMI_H
18 * KMI control register:
19 * KMICR_TYPE 0 = PS2/AT mode, 1 = No line control bit mode
20 * KMICR_RXINTREN 1 = enable RX interrupts
21 * KMICR_TXINTREN 1 = enable TX interrupts
22 * KMICR_EN 1 = enable KMI
23 * KMICR_FD 1 = force KMI data low
24 * KMICR_FC 1 = force KMI clock low
26 #define KMICR (KMI_BASE + 0x00)
27 #define KMICR_TYPE (1 << 5)
28 #define KMICR_RXINTREN (1 << 4)
29 #define KMICR_TXINTREN (1 << 3)
30 #define KMICR_EN (1 << 2)
31 #define KMICR_FD (1 << 1)
32 #define KMICR_FC (1 << 0)
35 * KMI status register:
36 * KMISTAT_TXEMPTY 1 = transmitter register empty
37 * KMISTAT_TXBUSY 1 = currently sending data
38 * KMISTAT_RXFULL 1 = receiver register ready to be read
39 * KMISTAT_RXBUSY 1 = currently receiving data
40 * KMISTAT_RXPARITY parity of last databyte received
41 * KMISTAT_IC current level of KMI clock input
42 * KMISTAT_ID current level of KMI data input
44 #define KMISTAT (KMI_BASE + 0x04)
45 #define KMISTAT_TXEMPTY (1 << 6)
46 #define KMISTAT_TXBUSY (1 << 5)
47 #define KMISTAT_RXFULL (1 << 4)
48 #define KMISTAT_RXBUSY (1 << 3)
49 #define KMISTAT_RXPARITY (1 << 2)
50 #define KMISTAT_IC (1 << 1)
51 #define KMISTAT_ID (1 << 0)
56 #define KMIDATA (KMI_BASE + 0x08)
59 * KMI clock divisor: to generate 8MHz internal clock
60 * div = (ref / 8MHz) - 1; 0 <= div <= 15
62 #define KMICLKDIV (KMI_BASE + 0x0c)
65 * KMI interrupt register:
66 * KMIIR_TXINTR 1 = transmit interrupt asserted
67 * KMIIR_RXINTR 1 = receive interrupt asserted
69 #define KMIIR (KMI_BASE + 0x10)
70 #define KMIIR_TXINTR (1 << 1)
71 #define KMIIR_RXINTR (1 << 0)
74 * The size of the KMI primecell
76 #define KMI_SIZE (0x100)