The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_cpu_acpi.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2016 The FreeBSD Foundation
    5  * Copyright (c) 2019 Colin Percival
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  *
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 
   37 #include <machine/bus.h>
   38 
   39 #include <dev/pci/pcireg.h>
   40 
   41 #include <dev/uart/uart.h>
   42 #include <dev/uart/uart_bus.h>
   43 #include <dev/uart/uart_cpu.h>
   44 #include <dev/uart/uart_cpu_acpi.h>
   45 
   46 #include <contrib/dev/acpica/include/acpi.h>
   47 #include <contrib/dev/acpica/include/accommon.h>
   48 #include <contrib/dev/acpica/include/actables.h>
   49 
   50 static struct acpi_uart_compat_data *
   51 uart_cpu_acpi_scan(uint8_t interface_type)
   52 {
   53         struct acpi_uart_compat_data **cd, *curcd;
   54         int i;
   55 
   56         SET_FOREACH(cd, uart_acpi_class_and_device_set) {
   57                 curcd = *cd;
   58                 for (i = 0; curcd[i].cd_hid != NULL; i++) {
   59                         if (curcd[i].cd_port_subtype == interface_type)
   60                                 return (&curcd[i]);
   61                 }
   62         }
   63 
   64         SET_FOREACH(cd, uart_acpi_class_set) {
   65                 curcd = *cd;
   66                 for (i = 0; curcd[i].cd_hid != NULL; i++) {
   67                         if (curcd[i].cd_port_subtype == interface_type)
   68                                 return (&curcd[i]);
   69                 }
   70         }
   71 
   72         return (NULL);
   73 }
   74 
   75 int
   76 uart_cpu_acpi_spcr(int devtype, struct uart_devinfo *di)
   77 {
   78         vm_paddr_t spcr_physaddr;
   79         ACPI_TABLE_SPCR *spcr;
   80         struct acpi_uart_compat_data *cd;
   81         struct uart_class *class;
   82         int error = ENXIO;
   83 
   84         /* SPCR only tells us about consoles. */
   85         if (devtype != UART_DEV_CONSOLE)
   86                 return (error);
   87 
   88         /* Look for the SPCR table. */
   89         spcr_physaddr = acpi_find_table(ACPI_SIG_SPCR);
   90         if (spcr_physaddr == 0)
   91                 return (error);
   92         spcr = acpi_map_table(spcr_physaddr, ACPI_SIG_SPCR);
   93         if (spcr == NULL) {
   94                 printf("Unable to map the SPCR table!\n");
   95                 return (error);
   96         }
   97 
   98         /* Search for information about this SPCR interface type. */
   99         cd = uart_cpu_acpi_scan(spcr->InterfaceType);
  100         if (cd == NULL)
  101                 goto out;
  102         class = cd->cd_class;
  103 
  104         /* Fill in some fixed details. */
  105         di->bas.chan = 0;
  106         di->bas.rclk = 0;
  107         di->databits = 8;
  108         di->stopbits = 1;
  109         di->parity = UART_PARITY_NONE;
  110         di->ops = uart_getops(class);
  111 
  112         /* Fill in details from SPCR table. */
  113         switch (spcr->SerialPort.SpaceId) {
  114         case 0:
  115                 di->bas.bst = uart_bus_space_mem;
  116                 break;
  117         case 1:
  118                 di->bas.bst = uart_bus_space_io;
  119                 break;
  120         default:
  121                 printf("UART in unrecognized address space: %d!\n",
  122                     (int)spcr->SerialPort.SpaceId);
  123                 goto out;
  124         }
  125         switch (spcr->SerialPort.AccessWidth) {
  126         case 0: /* EFI_ACPI_6_0_UNDEFINED */
  127                 /* FALLTHROUGH */
  128         case 1: /* EFI_ACPI_6_0_BYTE */
  129                 di->bas.regiowidth = 1;
  130                 break;
  131         case 2: /* EFI_ACPI_6_0_WORD */
  132                 di->bas.regiowidth = 2;
  133                 break;
  134         case 3: /* EFI_ACPI_6_0_DWORD */
  135                 di->bas.regiowidth = 4;
  136                 break;
  137         case 4: /* EFI_ACPI_6_0_QWORD */
  138                 di->bas.regiowidth = 8;
  139                 break;
  140         default:
  141                 printf("UART unsupported access width: %d!\n",
  142                     (int)spcr->SerialPort.AccessWidth);
  143                 goto out;
  144         }
  145         switch (spcr->SerialPort.BitWidth) {
  146         case 0:
  147                 /* FALLTHROUGH */
  148         case 8:
  149                 di->bas.regshft = 0;
  150                 break;
  151         case 16:
  152                 di->bas.regshft = 1;
  153                 break;
  154         case 32:
  155                 di->bas.regshft = 2;
  156                 break;
  157         case 64:
  158                 di->bas.regshft = 3;
  159                 break;
  160         default:
  161                 printf("UART unsupported bit width: %d!\n",
  162                     (int)spcr->SerialPort.BitWidth);
  163                 goto out;
  164         }
  165         switch (spcr->BaudRate) {
  166         case 0:
  167                 /* Special value; means "keep current value unchanged". */
  168                 di->baudrate = 0;
  169                 break;
  170         case 3:
  171                 di->baudrate = 9600;
  172                 break;
  173         case 4:
  174                 di->baudrate = 19200;
  175                 break;
  176         case 6:
  177                 di->baudrate = 57600;
  178                 break;
  179         case 7:
  180                 di->baudrate = 115200;
  181                 break;
  182         default:
  183                 printf("SPCR has reserved BaudRate value: %d!\n",
  184                     (int)spcr->BaudRate);
  185                 goto out;
  186         }
  187         if (spcr->PciVendorId != PCIV_INVALID &&
  188             spcr->PciDeviceId != PCIV_INVALID) {
  189                 di->pci_info.vendor = spcr->PciVendorId;
  190                 di->pci_info.device = spcr->PciDeviceId;
  191         }
  192 
  193         /* Apply device tweaks. */
  194         if ((cd->cd_quirks & UART_F_IGNORE_SPCR_REGSHFT) ==
  195             UART_F_IGNORE_SPCR_REGSHFT) {
  196                 di->bas.regshft = cd->cd_regshft;
  197         }
  198 
  199         /* Create a bus space handle. */
  200         error = bus_space_map(di->bas.bst, spcr->SerialPort.Address,
  201             uart_getrange(class), 0, &di->bas.bsh);
  202 
  203 out:
  204         acpi_unmap_table(spcr);
  205         return (error);
  206 }

Cache object: fdd72faeeadd13a0eefc17e489ad0bf2


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