205 lines
5.2 KiB
C
205 lines
5.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2016 The FreeBSD Foundation
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* Copyright (c) 2019 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <dev/pci/pcireg.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_cpu_acpi.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.h>
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#include <contrib/dev/acpica/include/actables.h>
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static struct acpi_uart_compat_data *
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uart_cpu_acpi_scan(uint8_t interface_type)
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{
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struct acpi_uart_compat_data **cd, *curcd;
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int i;
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SET_FOREACH(cd, uart_acpi_class_and_device_set) {
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curcd = *cd;
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for (i = 0; curcd[i].cd_hid != NULL; i++) {
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if (curcd[i].cd_port_subtype == interface_type)
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return (&curcd[i]);
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}
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}
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SET_FOREACH(cd, uart_acpi_class_set) {
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curcd = *cd;
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for (i = 0; curcd[i].cd_hid != NULL; i++) {
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if (curcd[i].cd_port_subtype == interface_type)
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return (&curcd[i]);
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}
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}
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return (NULL);
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}
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int
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uart_cpu_acpi_spcr(int devtype, struct uart_devinfo *di)
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{
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vm_paddr_t spcr_physaddr;
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ACPI_TABLE_SPCR *spcr;
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struct acpi_uart_compat_data *cd;
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struct uart_class *class;
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int error = ENXIO;
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/* SPCR only tells us about consoles. */
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if (devtype != UART_DEV_CONSOLE)
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return (error);
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/* Look for the SPCR table. */
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spcr_physaddr = acpi_find_table(ACPI_SIG_SPCR);
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if (spcr_physaddr == 0)
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return (error);
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spcr = acpi_map_table(spcr_physaddr, ACPI_SIG_SPCR);
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if (spcr == NULL) {
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printf("Unable to map the SPCR table!\n");
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return (error);
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}
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/* Search for information about this SPCR interface type. */
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cd = uart_cpu_acpi_scan(spcr->InterfaceType);
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if (cd == NULL)
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goto out;
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class = cd->cd_class;
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/* Fill in some fixed details. */
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di->bas.chan = 0;
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di->bas.rclk = 0;
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di->databits = 8;
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di->stopbits = 1;
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di->parity = UART_PARITY_NONE;
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di->ops = uart_getops(class);
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/* Fill in details from SPCR table. */
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switch (spcr->SerialPort.SpaceId) {
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case 0:
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di->bas.bst = uart_bus_space_mem;
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break;
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case 1:
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di->bas.bst = uart_bus_space_io;
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break;
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default:
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printf("UART in unrecognized address space: %d!\n",
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(int)spcr->SerialPort.SpaceId);
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goto out;
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}
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switch (spcr->SerialPort.AccessWidth) {
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case 0: /* EFI_ACPI_6_0_UNDEFINED */
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/* FALLTHROUGH */
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case 1: /* EFI_ACPI_6_0_BYTE */
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di->bas.regiowidth = 1;
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break;
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case 2: /* EFI_ACPI_6_0_WORD */
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di->bas.regiowidth = 2;
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break;
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case 3: /* EFI_ACPI_6_0_DWORD */
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di->bas.regiowidth = 4;
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break;
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case 4: /* EFI_ACPI_6_0_QWORD */
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di->bas.regiowidth = 8;
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break;
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default:
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printf("UART unsupported access width: %d!\n",
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(int)spcr->SerialPort.AccessWidth);
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goto out;
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}
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switch (spcr->SerialPort.BitWidth) {
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case 0:
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/* FALLTHROUGH */
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case 8:
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di->bas.regshft = 0;
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break;
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case 16:
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di->bas.regshft = 1;
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break;
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case 32:
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di->bas.regshft = 2;
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break;
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case 64:
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di->bas.regshft = 3;
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break;
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default:
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printf("UART unsupported bit width: %d!\n",
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(int)spcr->SerialPort.BitWidth);
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goto out;
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}
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switch (spcr->BaudRate) {
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case 0:
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/* Special value; means "keep current value unchanged". */
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di->baudrate = 0;
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break;
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case 3:
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di->baudrate = 9600;
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break;
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case 4:
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di->baudrate = 19200;
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break;
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case 6:
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di->baudrate = 57600;
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break;
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case 7:
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di->baudrate = 115200;
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break;
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default:
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printf("SPCR has reserved BaudRate value: %d!\n",
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(int)spcr->BaudRate);
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goto out;
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}
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if (spcr->PciVendorId != PCIV_INVALID &&
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spcr->PciDeviceId != PCIV_INVALID) {
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di->pci_info.vendor = spcr->PciVendorId;
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di->pci_info.device = spcr->PciDeviceId;
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}
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/* Apply device tweaks. */
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if ((cd->cd_quirks & UART_F_IGNORE_SPCR_REGSHFT) ==
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UART_F_IGNORE_SPCR_REGSHFT) {
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di->bas.regshft = cd->cd_regshft;
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}
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/* Create a bus space handle. */
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error = bus_space_map(di->bas.bst, spcr->SerialPort.Address,
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uart_getrange(class), 0, &di->bas.bsh);
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out:
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acpi_unmap_table(spcr);
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return (error);
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}
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