1 /* $NetBSD: riscv_platform.c,v 1.2 2023/06/12 19:04:13 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2023 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 /* 33 * This is the default RISC-V FDT platform implementation. It assumes the 34 * following: 35 * 36 * - Console UART is pre-configured by firmware 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: riscv_platform.c,v 1.2 2023/06/12 19:04:13 skrll Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/bus.h> 44 45 #include <dev/fdt/fdtvar.h> 46 47 #include <uvm/uvm_extern.h> 48 #include <uvm/pmap/pmap_devmap.h> 49 50 #include <riscv/fdt/riscv_fdtvar.h> 51 52 static const struct pmap_devmap * 53 riscv_platform_devmap(void) 54 { 55 static const struct pmap_devmap devmap_empty[] = { 56 DEVMAP_ENTRY_END 57 }; 58 59 static struct pmap_devmap devmap_uart[] = { 60 DEVMAP_ENTRY(VM_KERNEL_IO_BASE, 0, PAGE_SIZE), 61 DEVMAP_ENTRY_END 62 }; 63 bus_addr_t uart_base; 64 65 const int phandle = fdtbus_get_stdout_phandle(); 66 if (phandle <= 0) 67 return devmap_empty; 68 69 if (fdtbus_get_reg(phandle, 0, &uart_base, NULL) != 0) 70 return devmap_empty; 71 72 devmap_uart[0].pd_pa = DEVMAP_ALIGN(uart_base); 73 74 return devmap_uart; 75 } 76 77 78 static u_int 79 riscv_platform_uart_freq(void) 80 { 81 return 0; 82 } 83 84 static const struct fdt_platform riscv_platform = { 85 .fp_devmap = riscv_platform_devmap, 86 .fp_bootstrap = riscv_fdt_cpu_bootstrap, 87 .fp_uart_freq = riscv_platform_uart_freq, 88 .fp_mpstart = riscv_fdt_cpu_mpstart, 89 }; 90 91 FDT_PLATFORM(rv, FDT_PLATFORM_DEFAULT, &riscv_platform); 92