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 .flags = IORESOURCE_IO, 25 .start = 0x3C0, 26 .end = 0x3DF 27 }; 28 29 static struct pci_controller * __init 30 default_vga_hose_select(struct pci_controller *h1, struct pci_controller *h2) 31 { 32 if (h2->index < h1->index) 33 return h2; 34 35 return h1; 36 } 37 38 void __init 39 locate_and_init_vga(void *(*sel_func)(void *, void *)) 40 { 41 struct pci_controller *hose = NULL; 42 struct pci_dev *dev = NULL; 43 44 /* Default the select function */ 45 if (!sel_func) sel_func = (void *)default_vga_hose_select; 46 47 /* Find the console VGA device */ 48 for(dev=NULL; (dev=pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, dev));) { 49 if (!hose) 50 hose = dev->sysdata; 51 else 52 hose = sel_func(hose, dev->sysdata); 53 } 54 55 /* Did we already initialize the correct one? Is there one? */ 56 if (!hose || (conswitchp == &vga_con && pci_vga_hose == hose)) 57 return; 58 59 /* Create a new VGA ioport resource WRT the hose it is on. */ 60 alpha_vga.start += hose->io_space->start; 61 alpha_vga.end += hose->io_space->start; 62 request_resource(hose->io_space, &alpha_vga); 63 64 /* Set the VGA hose and init the new console. */ 65 pci_vga_hose = hose; 66 console_lock(); 67 do_take_over_console(&vga_con, 0, MAX_NR_CONSOLES-1, 1); 68 console_unlock(); 69 } 70 71 void __init 72 find_console_vga_hose(void) 73 { 74 u64 *pu64 = (u64 *)((u64)hwrpb + hwrpb->ctbt_offset); 75 76 if (pu64[7] == 3) { /* TERM_TYPE == graphics */ 77 struct pci_controller *hose; 78 int h = (pu64[30] >> 24) & 0xff; /* console hose # */ 79 80 /* 81 * Our hose numbering DOES match the console's, so find 82 * the right one... 83 */ 84 for (hose = hose_head; hose; hose = hose->next) { 85 if (hose->index == h) break; 86 } 87 88 if (hose) { 89 printk("Console graphics on hose %d\n", h); 90 pci_vga_hose = hose; 91 } 92 } 93 } 94 95 #endif 96