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