1 /* $NetBSD: mainbus.c,v 1.7 2024/08/04 08:16:25 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2022 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Nick Hudson 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "opt_console.h" 33 #include "opt_efi.h" 34 #include "opt_modular.h" 35 36 #include <sys/cdefs.h> 37 38 __RCSID("$NetBSD: mainbus.c,v 1.7 2024/08/04 08:16:25 skrll Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/types.h> 42 43 #include <sys/bus.h> 44 #include <sys/device.h> 45 #include <sys/systm.h> 46 47 #include <uvm/uvm_extern.h> 48 49 #include <dev/fdt/fdtvar.h> 50 51 #ifdef CONSADDR 52 #include <dev/ic/comreg.h> 53 #include <dev/ic/comvar.h> 54 #endif 55 56 #include <machine/sysreg.h> 57 58 extern struct bus_space riscv_generic_bs_tag; 59 60 bus_space_tag_t 61 fdtbus_bus_tag_create(int phandle, uint32_t flags) 62 { 63 return &riscv_generic_bs_tag; 64 } 65 66 static inline bool 67 cpu_earlydevice_va_p(void) 68 { 69 70 return __SHIFTOUT(csr_satp_read(), SATP_MODE); 71 } 72 73 void com_platform_early_putchar(char); 74 75 void __noasan 76 com_platform_early_putchar(char c) 77 { 78 #ifdef CONSADDR 79 #define CONSADDR_VA (VM_KERNEL_IO_BASE + (CONSADDR & SEGOFSET)) 80 81 volatile uint8_t *uartaddr = cpu_earlydevice_va_p() ? 82 (volatile uint8_t *)CONSADDR_VA : 83 (volatile uint8_t *)CONSADDR; 84 85 while ((uartaddr[com_lsr] & LSR_TXRDY) == 0) 86 ; 87 88 uartaddr[com_data] = c; 89 #endif 90 } 91 92 static int 93 mainbus_match(device_t parent, cfdata_t cf, void *aux) 94 { 95 static int once = 0; 96 97 if (once != 0) 98 return 0; 99 once = 1; 100 101 return 1; 102 } 103 104 105 static void 106 mainbus_attach_devicetree(device_t self) 107 { 108 struct fdt_attach_args faa = { 109 .faa_name = "", 110 .faa_phandle = OF_peer(0), 111 .faa_bst = &riscv_generic_bs_tag, 112 }; 113 114 aprint_normal("\n"); 115 116 config_found(self, &faa, NULL, CFARGS(.iattr = "fdt")); 117 } 118 119 static void 120 mainbus_attach(device_t parent, device_t self, void *aux) 121 { 122 if (fdtbus_get_data() != NULL) { 123 mainbus_attach_devicetree(self); 124 } 125 } 126 127 CFATTACH_DECL_NEW(mainbus, 0, mainbus_match, mainbus_attach, NULL, NULL); 128