[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] ns16550: Add ACPI support
Parse the ACPI SPCR table and initialize the 16550 compatible serial port. Signed-off-by: Wei Xu <xuwei5@xxxxxxxxxxxxx> --- xen/drivers/char/ns16550.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c index aa87c57..eb32891 100644 --- a/xen/drivers/char/ns16550.c +++ b/xen/drivers/char/ns16550.c @@ -1620,6 +1620,61 @@ DT_DEVICE_START(ns16550, "NS16550 UART", DEVICE_SERIAL) DT_DEVICE_END #endif /* HAS_DEVICE_TREE */ + +#ifdef CONFIG_ACPI +#include <xen/acpi.h> + +static int __init ns16550_acpi_uart_init(const void *data) +{ + struct acpi_table_spcr *spcr = NULL; + acpi_status status; + struct ns16550 *uart; + + status = acpi_get_table(ACPI_SIG_SPCR, 0, + (struct acpi_table_header **)&spcr); + + if ( ACPI_FAILURE(status) ) + { + printk("ns16550: Failed to get SPCR table\n"); + return -EINVAL; + } + + uart = &ns16550_com[0]; + + ns16550_init_common(uart); + + uart->baud = BAUD_AUTO; + uart->data_bits = 8; + uart->parity = spcr->parity; + uart->stop_bits = spcr->stop_bits; + uart->io_base = spcr->serial_port.address; + uart->io_size = 8; + uart->reg_shift = spcr->serial_port.bit_offset; + uart->reg_width = 1; + + /* trigger/polarity information is not available in spcr */ + irq_set_type(spcr->interrupt, IRQ_TYPE_LEVEL_HIGH); + uart->irq = spcr->interrupt; + + uart->vuart.base_addr = uart->io_base; + uart->vuart.size = uart->io_size; + uart->vuart.data_off = UART_THR << uart->reg_shift; + uart->vuart.status_off = UART_LSR << uart->reg_shift; + uart->vuart.status = UART_LSR_THRE | UART_LSR_TEMT; + + /* Register with generic serial driver. */ + serial_register_uart(uart - ns16550_com, &ns16550_driver, uart); + + return 0; +} + +ACPI_DEVICE_START(ans16550, "NS16550 UART", DEVICE_SERIAL) + .class_type = ACPI_DBG2_16550_COMPATIBLE, + .init = ns16550_acpi_uart_init, +ACPI_DEVICE_END + +#endif /* CONFIG_ACPI */ + /* * Local variables: * mode: C -- 2.8.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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