From e530d816ccf8b805ed1d4fd6e4fc757cbe61fa23 Mon Sep 17 00:00:00 2001
From: Duncan Laurie <dlaurie@google.com>
Date: Wed, 27 May 2020 12:32:30 -0700
Subject: drivers/uart/acpi: Add new device driver for UART attached devices

This driver generates an ACPI device object for a UART attached device
with all of the expected device support handlers like different interrupt
sources and power control GPIOs.

Example use:
chip drivers/uart/acpi
    register "name" = ""UDEV""
    register "desc" = ""UART Attached Device""
    register "hid" = "ACPI_DT_NAMESPACE_HID"
    register "compat_string" = ""google,cros-ec-uart""
    register "irq_gpio" = "ACPI_GPIO_IRQ_LEVEL_LOW_WAKE(GPP_C20)"
    register "uart" = "ACPI_UART_RAW_DEVICE(115200, 64)"
    device generic 0 on end
end

Resulting in this ACPI device:

Device (UDEV)
{
    Name (_HID, "PRP0001")
    Name (_UID, Zero)
    Name (_DDN, "UART Attached Device")
    Method (_STA, 0, NotSerialized)
    {
        Return (0x0F)
    }
    Name (_CRS, ResourceTemplate ()
    {
        UartSerialBusV2 (0x0001C200, DataBitsEight, StopBitsOne,
                         0x00, LittleEndian, ParityTypeNone, FlowControlNone,
                         0x0040, 0x0040, "\\_SB.PCI0.UAR2",
                         0x00, ResourceConsumer, , Exclusive)
        GpioInt (Level, ActiveLow, ExclusiveAndWake, PullDefault, 0x0000,
                 "\\_SB.PCI0.GPIO", 0x00, ResourceConsumer)
        {
            0x0114
        }
    })
    Name (_DSD, Package (0x02)
    {
        ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
        Package (0x01)
        {
            Package (0x02)
            {
                "compatible",
                "google,cros-ec-uart"
            }
        }
    })
}

Change-Id: Idfd2d9d2ab6990a82ddd401734c0d9b1b0b8f82d
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41793
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
---
 src/drivers/uart/acpi/Kconfig | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 src/drivers/uart/acpi/Kconfig

(limited to 'src/drivers/uart/acpi/Kconfig')

diff --git a/src/drivers/uart/acpi/Kconfig b/src/drivers/uart/acpi/Kconfig
new file mode 100644
index 0000000000..de7dc82de4
--- /dev/null
+++ b/src/drivers/uart/acpi/Kconfig
@@ -0,0 +1,2 @@
+config DRIVERS_UART_ACPI
+	bool
-- 
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