src/southbridge/intel/i82371eb/isa.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <stdint.h>
   4 #include <console/console.h>
   5 #include <device/device.h>
   6 #include <device/pci.h>
   7 #include <device/pci_ops.h>
   8 #include <device/pci_ids.h>
   9 #include <pc80/isa-dma.h>
  10 #include <pc80/mc146818rtc.h>
  11 #include <arch/ioapic.h>
  12 #if CONFIG(HAVE_ACPI_TABLES)
  13 #include <acpi/acpi.h>
  14 #include <acpi/acpigen.h>
  15 #endif
  16 #include "i82371eb.h"
  17 #include "chip.h"
  18
  19 static void isa_init(struct device *dev)
  20 {
  21         u32 reg32;
  22         struct southbridge_intel_i82371eb_config *sb = dev->chip_info;
  23
  24         /* Initialize the real time clock (RTC). */
  25         cmos_init(0);
  26
  27         /*
  28          * Enable special cycles, needed for soft poweroff.
  29          */
  30         pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_SPECIAL);
  31
  32         /*
  33          * The PIIX4 can support the full ISA bus, or the Extended I/O (EIO)
  34          * bus, which is a subset of ISA. We select the full ISA bus here.
  35          */
  36         reg32 = pci_read_config32(dev, GENCFG);
  37         reg32 |= ISA;   /* Select ISA, not EIO. */
  38
  39         /* Some boards use GPO22/23. Select it if configured. */
  40         reg32 = ONOFF(sb->gpo22_enable, reg32, GPO2223);
  41         pci_write_config32(dev, GENCFG, reg32);
  42
  43         /* Initialize ISA DMA. */
  44         isa_dma_init();
  45
  46         /*
  47          * Unlike most other southbridges the 82371EB doesn't have a built-in
  48          * IOAPIC. Instead, 82371EB-based boards that support multiple CPUs
  49          * have a discrete IOAPIC (Intel 82093AA) soldered onto the board.
  50          *
  51          * Thus, we can/must only enable the IOAPIC if it actually exists,
  52          * i.e. the respective mainboard does "select IOAPIC".
  53          */
  54         if (CONFIG(IOAPIC)) {
  55                 u16 reg16;
  56                 u8 ioapic_id = 2;
  57
  58                 /* Enable IOAPIC. */
  59                 reg16 = pci_read_config16(dev, XBCS);
  60                 reg16 |= (1 << 8); /* APIC Chip Select */
  61                 pci_write_config16(dev, XBCS, reg16);
  62
  63                 /* Set and verify the IOAPIC ID. */
  64                 setup_ioapic(VIO_APIC_VADDR, ioapic_id);
  65                 if (ioapic_id != get_ioapic_id(VIO_APIC_VADDR))
  66                         die("IOAPIC error!\n");
  67         }
  68 }
  69
  70 static void sb_read_resources(struct device *dev)
  71 {
  72         struct resource *res;
  73
  74         pci_dev_read_resources(dev);
  75
  76         res = new_resource(dev, 1);
  77         res->base = 0x0UL;
  78         res->size = 0x1000UL;
  79         res->limit = 0xffffUL;
  80         res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
  81
  82         res = new_resource(dev, 2);
  83         res->base = 0xff800000UL;
  84         res->size = 0x00800000UL; /* 8 MB for flash */
  85         res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED |
  86                 IORESOURCE_RESERVE;
  87
  88         res = new_resource(dev, 3); /* IOAPIC */
  89         res->base = IO_APIC_ADDR;
  90         res->size = 0x00001000;
  91         res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED |
  92                 IORESOURCE_RESERVE;
  93 }
  94
  95 static const struct device_operations isa_ops = {
  96         .read_resources         = sb_read_resources,
  97         .set_resources          = pci_dev_set_resources,
  98         .enable_resources       = pci_dev_enable_resources,
  99 #if CONFIG(HAVE_ACPI_TABLES)
 100         .write_acpi_tables      = acpi_write_hpet,
 101         .acpi_fill_ssdt         = generate_cpu_entries,
 102 #endif
 103         .init                   = isa_init,
 104         .scan_bus               = scan_static_bus,
 105         .ops_pci                = 0, /* No subsystem IDs on 82371EB! */
 106 };
 107
 108 static const struct pci_driver isa_driver __pci_driver = {
 109         .ops    = &isa_ops,
 110         .vendor = PCI_VID_INTEL,
 111         .device = PCI_DID_INTEL_82371AB_ISA,
 112 };
 113
 114 static const struct pci_driver isa_SB_driver __pci_driver = {
 115         .ops    = &isa_ops,
 116         .vendor = PCI_VID_INTEL,
 117         .device = PCI_DID_INTEL_82371SB_ISA,
 118 };