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/** @file
*
* [DSDT] Serial devices (UART).
*
* Copyright (c) 2021, ARM Limited. All rights reserved.
* Copyright (c) 2020, Pete Batard <pete@akeo.ie>
* Copyright (c) 2018, Andrey Warkentin <andrey.warkentin@gmail.com>
* Copyright (c) Microsoft Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
**/
#include <asm/arch/acpi/bcm2836.h>
#include "acpitables.h"
// PL011 based UART.
Device (URT0)
{
Name (_HID, "BCM2837")
Name (_CID, "ARMH0011")
Name (_UID, 0x4)
Name (_CCA, 0x0)
Name (RBUF, ResourceTemplate ()
{
MEMORY32FIXED (ReadWrite, 0, BCM2836_PL011_UART_LENGTH, RMEM)
Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive) { BCM2836_PL011_UART_INTERRUPT }
})
Method (_CRS, 0x0, Serialized)
{
MEMORY32SETBASE (RBUF, RMEM, RBAS, BCM2836_PL011_UART_OFFSET)
Return (^RBUF)
}
Name (CLCK, 48000000)
Name (_DSD, Package ()
{
ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), Package ()
{
Package (2) { "clock-frequency", CLCK },
}
})
}
//
// UART Mini.
//
// This device is referenced in the DBG2 table, which will cause the system to
// not start the driver when the debugger is enabled and to mark the device
// with problem code 53 (CM_PROB_USED_BY_DEBUGGER).
//
Device (URTM)
{
Name (_HID, "BCM2836")
Name (_CID, "BCM2836")
Name (_UID, 0x0)
Name (_CCA, 0x0)
Name (RBUF, ResourceTemplate ()
{
MEMORY32FIXED (ReadWrite, 0, BCM2836_MINI_UART_LENGTH, RMEM)
Interrupt(ResourceConsumer, Level, ActiveHigh, Shared) { BCM2836_MINI_UART_INTERRUPT }
})
Method (_CRS, 0x0, Serialized)
{
MEMORY32SETBASE (RBUF, RMEM, RBAS, BCM2836_MINI_UART_OFFSET)
Return (^RBUF)
}
//
// Mini Uart Clock Rate will be dynamically updated during boot
//
External (\_SB.URTM.MUCR, IntObj)
Name (_DSD, Package ()
{
ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), Package ()
{
Package (2) { "clock-frequency", MUCR },
}
})
}
//
// Multifunction serial bus device to support Bluetooth function.
//
Device(BTH0)
{
Name (_HID, "BCM2EA6")
Name (_CID, "BCM2EA6")
//
// UART In Use will be dynamically updated during boot
//
External (\_SB.BTH0.URIU, IntObj)
Method (_STA)
{
Return (0xf)
}
//
// Resource for URT0 (PL011)
//
Name (BTPL, ResourceTemplate ()
{
UARTSerialBus(
115200, // InitialBaudRate: in BPS
, // BitsPerByte: default to 8 bits
, // StopBits: Defaults to one bit
0x00, // LinesInUse: 8 1-bit flags to
// declare enabled control lines.
// Raspberry Pi does not exposed
// HW control signals -> not supported.
// Optional bits:
// - Bit 7 (0x80) Request To Send (RTS)
// - Bit 6 (0x40) Clear To Send (CTS)
// - Bit 5 (0x20) Data Terminal Ready (DTR)
// - Bit 4 (0x10) Data Set Ready (DSR)
// - Bit 3 (0x08) Ring Indicator (RI)
// - Bit 2 (0x04) Data Carrier Detect (DTD)
// - Bit 1 (0x02) Reserved. Must be 0.
// - Bit 0 (0x01) Reserved. Must be 0.
, // IsBigEndian:
// default to LittleEndian.
, // Parity: Defaults to no parity
, // FlowControl: Defaults to
// no flow control.
16, // ReceiveBufferSize
16, // TransmitBufferSize
"\\_SB.GDV0.URT0", // ResourceSource:
// UART bus controller name
, // ResourceSourceIndex: assumed to be 0
, // ResourceUsage: assumed to be
// ResourceConsumer
UAR0, // DescriptorName: creates name
// for offset of resource descriptor
) // Vendor data
})
//
// Resource for URTM (miniUART)
//
Name (BTMN, ResourceTemplate ()
{
//
// BT UART: ResourceSource will be dynamically updated to
// either URT0 (PL011) or URTM (miniUART) during boot
//
UARTSerialBus(
115200, // InitialBaudRate: in BPS
, // BitsPerByte: default to 8 bits
, // StopBits: Defaults to one bit
0x00, // LinesInUse: 8 1-bit flags to
// declare enabled control lines.
// Raspberry Pi does not exposed
// HW control signals -> not supported.
// Optional bits:
// - Bit 7 (0x80) Request To Send (RTS)
// - Bit 6 (0x40) Clear To Send (CTS)
// - Bit 5 (0x20) Data Terminal Ready (DTR)
// - Bit 4 (0x10) Data Set Ready (DSR)
// - Bit 3 (0x08) Ring Indicator (RI)
// - Bit 2 (0x04) Data Carrier Detect (DTD)
// - Bit 1 (0x02) Reserved. Must be 0.
// - Bit 0 (0x01) Reserved. Must be 0.
, // IsBigEndian:
// default to LittleEndian.
, // Parity: Defaults to no parity
, // FlowControl: Defaults to
// no flow control.
16, // ReceiveBufferSize
16, // TransmitBufferSize
"\\_SB.GDV0.URTM", // ResourceSource:
// UART bus controller name
, // ResourceSourceIndex: assumed to be 0
, // ResourceUsage: assumed to be
// ResourceConsumer
UARM, // DescriptorName: creates name
// for offset of resource descriptor
) // Vendor data
})
Method (_CRS, 0x0, Serialized)
{
if (URIU == 0)
{
//
// PL011 UART is configured for console output
// Return Mini UART for Bluetooth
//
return (^BTMN)
}
else
{
//
// Mini UART is configured for console output
// Return PL011 UART for Bluetooth
//
return (^BTPL)
}
}
}
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