1 /* $NetBSD: arm_platform.c,v 1.7 2023/04/07 08:55:30 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * This is the default Arm FDT platform implementation. It assumes the 31 * following: 32 * 33 * - Generic timer 34 * - PSCI support 35 * - Console UART is pre-configured by firmware 36 */ 37 38 #include "opt_console.h" 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: arm_platform.c,v 1.7 2023/04/07 08:55:30 skrll Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/bus.h> 45 #include <sys/cpu.h> 46 #include <sys/device.h> 47 #include <sys/termios.h> 48 49 #include <dev/fdt/fdtvar.h> 50 51 #include <uvm/uvm_extern.h> 52 53 #include <machine/bootconfig.h> 54 55 #include <arm/cpufunc.h> 56 57 #include <arm/cortex/gtmr_var.h> 58 59 #include <arm/arm/psci.h> 60 61 #include <arm/fdt/arm_fdtvar.h> 62 #include <arm/fdt/psci_fdtvar.h> 63 64 #include <evbarm/dev/plcomreg.h> 65 #include <evbarm/dev/plcomvar.h> 66 67 #include <libfdt.h> 68 69 #include <arch/evbarm/fdt/platform.h> 70 71 extern struct arm32_bus_dma_tag arm_generic_dma_tag; 72 extern struct bus_space arm_generic_bs_tag; 73 74 void plcom_platform_early_putchar(char); 75 76 #define ARM_PTOV(p) (((p) - DEVMAP_ALIGN(uart_base)) + KERNEL_IO_VBASE) 77 78 void __noasan 79 plcom_platform_early_putchar(char c) 80 { 81 #ifdef CONSADDR 82 bus_addr_t uart_base = CONSADDR; 83 84 volatile uint32_t *uartaddr = cpu_earlydevice_va_p() ? 85 (volatile uint32_t *)ARM_PTOV(uart_base): 86 (volatile uint32_t *)uart_base; 87 88 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFF) != 0) 89 continue; 90 91 uartaddr[PL01XCOM_DR / 4] = htole32(c); 92 dsb(sy); 93 94 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFE) == 0) 95 continue; 96 #endif 97 } 98 99 static void 100 arm_platform_init_attach_args(struct fdt_attach_args *faa) 101 { 102 faa->faa_bst = &arm_generic_bs_tag; 103 faa->faa_dmat = &arm_generic_dma_tag; 104 } 105 106 static void 107 arm_platform_device_register(device_t self, void *aux) 108 { 109 } 110 111 static const struct pmap_devmap * 112 arm_platform_devmap(void) 113 { 114 static const struct pmap_devmap devmap_empty[] = { 115 DEVMAP_ENTRY_END 116 }; 117 static struct pmap_devmap devmap_uart[] = { 118 DEVMAP_ENTRY(KERNEL_IO_VBASE, 0, PAGE_SIZE), 119 DEVMAP_ENTRY_END 120 }; 121 122 const int phandle = fdtbus_get_stdout_phandle(); 123 if (phandle <= 0) 124 return devmap_empty; 125 126 bus_addr_t uart_base; 127 if (fdtbus_get_reg(phandle, 0, &uart_base, NULL) != 0) 128 return devmap_empty; 129 130 devmap_uart[0].pd_pa = DEVMAP_ALIGN(uart_base); 131 132 return devmap_uart; 133 } 134 135 static u_int 136 arm_platform_uart_freq(void) 137 { 138 return 0; 139 } 140 141 static const struct fdt_platform arm_platform = { 142 .fp_devmap = arm_platform_devmap, 143 .fp_bootstrap = arm_fdt_cpu_bootstrap, 144 .fp_init_attach_args = arm_platform_init_attach_args, 145 .fp_device_register = arm_platform_device_register, 146 .fp_reset = psci_fdt_reset, 147 .fp_delay = gtmr_delay, 148 .fp_uart_freq = arm_platform_uart_freq, 149 .fp_mpstart = arm_fdt_cpu_mpstart, 150 }; 151 152 FDT_PLATFORM(arm, FDT_PLATFORM_DEFAULT, &arm_platform); 153