mirror of
https://github.com/reactos/reactos.git
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134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
/*
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* PROJECT: ReactOS Boot Loader
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: boot/armllb/hw/versatile/hwkmi.c
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* PURPOSE: LLB KMI Support for Versatile
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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#include "precomp.h"
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//
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// Control Register Bits
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//
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#define KMICR_TYPE (1 << 5)
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#define KMICR_RXINTREN (1 << 4)
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#define KMICR_TXINTREN (1 << 3)
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#define KMICR_EN (1 << 2)
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#define KMICR_FD (1 << 1)
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#define KMICR_FC (1 << 0)
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//
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// Status Register Bits
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//
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#define KMISTAT_TXEMPTY (1 << 6)
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#define KMISTAT_TXBUSY (1 << 5)
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#define KMISTAT_RXFULL (1 << 4)
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#define KMISTAT_RXBUSY (1 << 3)
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#define KMISTAT_RXPARITY (1 << 2)
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#define KMISTAT_IC (1 << 1)
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#define KMISTAT_ID (1 << 0)
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//
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// KMI Registers
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//
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#define PL050_KMICR (LlbHwVersaKmiBase + 0x00)
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#define PL050_KMISTAT (LlbHwVersaKmiBase + 0x04)
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#define PL050_KMIDATA (LlbHwVersaKmiBase + 0x08)
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#define PL050_KMICLKDIV (LlbHwVersaKmiBase + 0x0c)
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static const ULONG LlbHwVersaKmiBase = 0x10006000;
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//
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// PS/2 Commands/Requests
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//
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#define PS2_O_RESET 0xff
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#define PS2_O_RESEND 0xfe
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#define PS2_O_DISABLE 0xf5
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#define PS2_O_ENABLE 0xf4
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#define PS2_O_ECHO 0xee
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#define PS2_O_SET_DEFAULT 0xf6
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#define PS2_O_SET_RATE_DELAY 0xf3
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#define PS2_O_SET_SCANSET 0xf0
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#define PS2_O_INDICATORS 0xed
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#define PS2_I_RESEND 0xfe
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#define PS2_I_DIAGFAIL 0xfd
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#define PS2_I_ACK 0xfa
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#define PS2_I_BREAK 0xf0
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#define PS2_I_ECHO 0xee
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#define PS2_I_BAT_OK 0xaa
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/* FUNCTIONS ******************************************************************/
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VOID
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NTAPI
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LlbHwVersaKmiSendAndWait(IN ULONG Value)
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{
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volatile int i = 1000;
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/* Send the value */
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LlbHwKbdSend(Value);
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/* Wait a bit */
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while (--i);
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/* Now make sure we received an ACK */
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if (LlbHwKbdRead() != PS2_I_ACK) DbgPrint("PS/2 FAILURE!\n");
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}
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VOID
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NTAPI
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LlbHwVersaKmiInitialize(VOID)
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{
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UCHAR Divisor;
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/* Setup divisor and enable KMI */
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Divisor = (LlbHwGetPClk() / 8000000) - 1;
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WRITE_REGISTER_UCHAR(PL050_KMICLKDIV, Divisor);
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WRITE_REGISTER_UCHAR(PL050_KMICR, KMICR_EN);
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/* Reset PS/2 controller */
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LlbHwVersaKmiSendAndWait(PS2_O_RESET);
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if (LlbHwKbdRead() != PS2_I_BAT_OK) DbgPrint("PS/2 RESET FAILURE!\n");
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/* Send PS/2 Initialization Stream */
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LlbHwVersaKmiSendAndWait(PS2_O_DISABLE);
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LlbHwVersaKmiSendAndWait(PS2_O_SET_DEFAULT);
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LlbHwVersaKmiSendAndWait(PS2_O_SET_SCANSET);
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LlbHwVersaKmiSendAndWait(1);
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LlbHwVersaKmiSendAndWait(PS2_O_ENABLE);
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}
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VOID
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NTAPI
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LlbHwKbdSend(IN ULONG Value)
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{
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ULONG Status;
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/* Wait for ready signal */
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do
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{
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/* Read TX buffer state */
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Status = READ_REGISTER_UCHAR(PL050_KMISTAT);
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} while (!(Status & KMISTAT_TXEMPTY));
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/* Send value */
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WRITE_REGISTER_UCHAR(PL050_KMIDATA, Value);
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}
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BOOLEAN
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NTAPI
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LlbHwKbdReady(VOID)
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{
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return READ_REGISTER_UCHAR(PL050_KMISTAT) & KMISTAT_RXFULL;
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}
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INT
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NTAPI
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LlbHwKbdRead(VOID)
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{
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/* Read current data on keyboard */
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return READ_REGISTER_UCHAR(PL050_KMIDATA);
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}
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/* EOF */
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