drivers/firmware/pcdp.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Definitions for PCDP-defined console devices
   4  *
   5  * For DIG64_HCDPv10a_01.pdf and DIG64_PCDPv20.pdf (v1.0a and v2.0 resp.),
   6  * please see <http://www.dig64.org/specifications/>
   7  *
   8  * (c) Copyright 2002, 2004 Hewlett-Packard Development Company, L.P.
   9  *      Khalid Aziz <khalid.aziz@hp.com>
  10  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
  11  */
  12
  13 #define PCDP_CONSOLE                    0
  14 #define PCDP_DEBUG                      1
  15 #define PCDP_CONSOLE_OUTPUT             2
  16 #define PCDP_CONSOLE_INPUT              3
  17
  18 #define PCDP_UART                       (0 << 3)
  19 #define PCDP_VGA                        (1 << 3)
  20 #define PCDP_USB                        (2 << 3)
  21
  22 /* pcdp_uart.type and pcdp_device.type */
  23 #define PCDP_CONSOLE_UART               (PCDP_UART | PCDP_CONSOLE)
  24 #define PCDP_DEBUG_UART                 (PCDP_UART | PCDP_DEBUG)
  25 #define PCDP_CONSOLE_VGA                (PCDP_VGA  | PCDP_CONSOLE_OUTPUT)
  26 #define PCDP_CONSOLE_USB                (PCDP_USB  | PCDP_CONSOLE_INPUT)
  27
  28 /* pcdp_uart.flags */
  29 #define PCDP_UART_EDGE_SENSITIVE        (1 << 0)
  30 #define PCDP_UART_ACTIVE_LOW            (1 << 1)
  31 #define PCDP_UART_PRIMARY_CONSOLE       (1 << 2)
  32 #define PCDP_UART_IRQ                   (1 << 6) /* in pci_func for rev < 3 */
  33 #define PCDP_UART_PCI                   (1 << 7) /* in pci_func for rev < 3 */
  34
  35 struct pcdp_uart {
  36         u8                              type;
  37         u8                              bits;
  38         u8                              parity;
  39         u8                              stop_bits;
  40         u8                              pci_seg;
  41         u8                              pci_bus;
  42         u8                              pci_dev;
  43         u8                              pci_func;
  44         u64                             baud;
  45         struct acpi_generic_address     addr;
  46         u16                             pci_dev_id;
  47         u16                             pci_vendor_id;
  48         u32                             gsi;
  49         u32                             clock_rate;
  50         u8                              pci_prog_intfc;
  51         u8                              flags;
  52         u16                             conout_index;
  53         u32                             reserved;
  54 } __attribute__((packed));
  55
  56 #define PCDP_IF_PCI     1
  57
  58 /* pcdp_if_pci.trans */
  59 #define PCDP_PCI_TRANS_IOPORT   0x02
  60 #define PCDP_PCI_TRANS_MMIO     0x01
  61
  62 struct pcdp_if_pci {
  63         u8                      interconnect;
  64         u8                      reserved;
  65         u16                     length;
  66         u8                      segment;
  67         u8                      bus;
  68         u8                      dev;
  69         u8                      fun;
  70         u16                     dev_id;
  71         u16                     vendor_id;
  72         u32                     acpi_interrupt;
  73         u64                     mmio_tra;
  74         u64                     ioport_tra;
  75         u8                      flags;
  76         u8                      trans;
  77 } __attribute__((packed));
  78
  79 struct pcdp_vga {
  80         u8                      count;          /* address space descriptors */
  81 } __attribute__((packed));
  82
  83 /* pcdp_device.flags */
  84 #define PCDP_PRIMARY_CONSOLE    1
  85
  86 struct pcdp_device {
  87         u8                      type;
  88         u8                      flags;
  89         u16                     length;
  90         u16                     efi_index;
  91         /* next data is pcdp_if_pci or pcdp_if_acpi (not yet supported) */
  92         /* next data is device specific type (currently only pcdp_vga) */
  93 } __attribute__((packed));
  94
  95 struct pcdp {
  96         u8                      signature[4];
  97         u32                     length;
  98         u8                      rev;            /* PCDP v2.0 is rev 3 */
  99         u8                      chksum;
 100         u8                      oemid[6];
 101         u8                      oem_tabid[8];
 102         u32                     oem_rev;
 103         u8                      creator_id[4];
 104         u32                     creator_rev;
 105         u32                     num_uarts;
 106         struct pcdp_uart        uart[0];        /* actual size is num_uarts */
 107         /* remainder of table is pcdp_device structures */
 108 } __attribute__((packed));