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soc/amd/picasso: Add device operations for UART MMIO devices 

This change adds device_operations for UART MMIO devices that provides
following operations:
1. uart_acpi_name: Returns ACPI name of UART device. Generation of
UART device node is not yet moved to SSDT, but will be done in
follow-up CLs.
2. scan_bus: Uses scan_static_bus to scan devices added under the UART
devices. This allows mainboard to add devices under the UART MMIO
device.

Change-Id: I18abbe88952e7006668657eb1d0c177e53e95850
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42068
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
This commit is contained in:
Furquan Shaikh 2020-06-03 16:50:32 -07:00 committed by Patrick Georgi
parent 071182ade3
commit b07e262c48
2 changed files with 31 additions and 0 deletions
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8
src/soc/amd/picasso/chip.c
View File

@ -15,6 +15,8 @@
/* Supplied by i2c.c */
extern struct device_operations picasso_i2c_mmio_ops;
/* Supplied by uart.c */
extern struct device_operations picasso_uart_mmio_ops;
struct device_operations cpu_bus_ops = {
.read_resources = noop_read_resources,
@ -126,6 +128,12 @@ static void set_mmio_dev_ops(struct device *dev)
case APU_I2C4_BASE:
dev->ops = &picasso_i2c_mmio_ops;
break;
case APU_UART0_BASE:
case APU_UART1_BASE:
case APU_UART2_BASE:
case APU_UART3_BASE:
dev->ops = &picasso_uart_mmio_ops;
break;
}
}

23
src/soc/amd/picasso/uart.c
View File

@ -74,3 +74,26 @@ unsigned int uart_platform_refclk(void)
{
return CONFIG(PICASSO_UART_48MZ) ? 48000000 : 115200 * 16;
}
static const char *uart_acpi_name(const struct device *dev)
{
switch (dev->path.mmio.addr) {
case APU_UART0_BASE:
return "FUR0";
case APU_UART1_BASE:
return "FUR1";
case APU_UART2_BASE:
return "FUR2";
case APU_UART3_BASE:
return "FUR3";
default:
return NULL;
}
}
struct device_operations picasso_uart_mmio_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.scan_bus = scan_static_bus,
.acpi_name = uart_acpi_name,
};