1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/alpha/kernel/console.c 4 * 5 * Architecture-specific specific support for VGA device on 6 * non-0 I/O hose 7 */ 8 9 #include <linux/pci.h> 10 #include <linux/init.h> 11 #include <linux/tty.h> 12 #include <linux/console.h> 13 #include <linux/vt.h> 14 #include <asm/vga.h> 15 #include <asm/machvec.h> 16 17 #include "pci_impl.h" 18 #include "proto.h" 19 20 #ifdef CONFIG_VGA_HOSE 21 22 struct pci_controller *pci_vga_hose; 23 static struct resource alpha_vga = { 24 .name = "alpha-vga+", 25 .flags = IORESOURCE_IO, 26 .start = 0x3C0, 27 .end = 0x3DF 28 }; 29 30 static struct pci_controller * __init 31 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2) 32 { 33 if (h2->index < h1->index) 34 return h2; 35 36 return h1; 37 } 38 39 void __init 40 locate_and_init_vga(void *(*sel_func)(void *, void *)) 41 { 42 struct pci_controller *hose = NULL; 43 struct pci_dev *dev = NULL; 44 45 /* Default the select function */ 46 if (!sel_func) sel_func = (void *)default_vga_hose_select; 47 48 /* Find the console VGA device */ 49 for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) { 50 if (!hose) 51 hose = dev->sysdata; 52 else 53 hose = sel_func(hose, dev->sysdata); 54 } 55 56 /* Did we already initialize the correct one? Is there one? */ 57 if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose)) 58 return; 59 60 /* Create a new VGA ioport resource WRT the hose it is on. */ 61 alpha_vga.start += hose->io_space->start; 62 alpha_vga.end += hose->io_space->start; 63 request_resource(hose->io_space, &alpha_vga); 64 65 /* Set the VGA hose and init the new console. */ 66 pci_vga_hose = hose; 67 console_lock(); 68 do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1); 69 console_unlock(); 70 } 71 72 void __init 73 find_console_vga_hose(void) 74 { 75 u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset); 76 77 if (pu64[7] == 3) { /* TERM_TYPE == graphics */ 78 struct pci_controller *hose; 79 int h = (pu64[30] >> 24) & 0xff; /* console hose # */ 80 81 /* 82 * Our hose numbering DOES match the console's, so find 83 * the right one... 84 */ 85 for (hose = hose_head; hose; hose = hose->next) { 86 if (hose->index == h) break; 87 } 88 89 if (hose) { 90 printk("Console graphics on hose %d\n", h); 91 pci_vga_hose = hose; 92 } 93 } 94 } 95 96 #endif 97