1 /* $NetBSD: ns8250_uart.c,v 1.9 2026/08/07 14:31:36 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2017-2020 Jared McNeill <jmcneill (at) 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 31 __KERNEL_RCSID(1, "$NetBSD: ns8250_uart.c,v 1.9 2026/08/07 14:31:36 thorpej Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/device.h> 36 #include <sys/intr.h> 37 #include <sys/systm.h> 38 #include <sys/time.h> 39 #include <sys/termios.h> 40 41 #include <dev/ic/comvar.h> 42 43 #include <dev/fdt/fdtvar.h> 44 #include <dev/fdt/fdt_console.h> 45 46 static int ns8250_uart_match(device_t, cfdata_t, void *); 47 static void ns8250_uart_attach(device_t, device_t, void *); 48 49 struct ns8250_config { 50 int type; 51 int (*enable)(struct com_softc *); 52 void (*disable)(struct com_softc *); 53 }; 54 55 static const struct ns8250_config ns8250_config = { 56 .type = COM_TYPE_NORMAL, 57 }; 58 59 static const struct ns8250_config ns16750_config = { 60 .type = COM_TYPE_16750, 61 }; 62 63 #define NS8250_OCTEON_USR_REG 0x0138 64 65 static int 66 ns8250_octeon_enable(struct com_softc *sc) 67 { 68 struct com_regs *regsp = &sc->sc_regs; 69 70 /* XXX Clear old busy detect interrupts */ 71 bus_space_read_1(regsp->cr_iot, regsp->cr_ioh, NS8250_OCTEON_USR_REG); 72 73 return 0; 74 } 75 76 static const struct ns8250_config octeon_config = { 77 .type = COM_TYPE_16550_NOERS, 78 .enable = ns8250_octeon_enable, 79 }; 80 81 static const struct device_compatible_entry compat_data[] = { 82 { .compat = "cavium,octeon-3860-uart", .data = &octeon_config }, 83 { .compat = "ns8250", .data = &ns8250_config }, 84 { .compat = "ns16450", .data = &ns8250_config }, 85 { .compat = "ns16550a", .data = &ns8250_config }, 86 { .compat = "ns16550", .data = &ns8250_config }, 87 { .compat = "ns16750", .data = &ns16750_config }, 88 DEVICE_COMPAT_EOL 89 }; 90 91 CFATTACH_DECL_NEW(ns8250_uart, sizeof(struct com_softc), 92 ns8250_uart_match, ns8250_uart_attach, NULL, NULL); 93 94 static int 95 ns8250_uart_match(device_t parent, cfdata_t cf, void *aux) 96 { 97 struct fdt_attach_args * const faa = aux; 98 99 return of_compatible_match(faa->faa_phandle, compat_data); 100 } 101 102 static void 103 ns8250_uart_attach(device_t parent, device_t self, void *aux) 104 { 105 struct com_softc * const sc = device_private(self); 106 struct fdt_attach_args * const faa = aux; 107 const int phandle = faa->faa_phandle; 108 bus_space_tag_t bst = faa->faa_bst; 109 bus_space_handle_t bsh; 110 char intrstr[128]; 111 struct clk *clk; 112 bus_addr_t addr; 113 bus_size_t size; 114 u_int reg_shift; 115 int error; 116 void *ih; 117 118 const struct ns8250_config *config = 119 of_compatible_lookup(phandle, compat_data)->data; 120 121 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 122 aprint_error(": couldn't get registers\n"); 123 return; 124 } 125 126 reg_shift = fdtbus_get_reg_shift(phandle, 0); 127 128 sc->sc_dev = self; 129 if (of_getprop_uint32(phandle, "clock-frequency", &sc->sc_frequency)) { 130 clk = fdtbus_clock_get_index(phandle, 0); 131 if (clk != NULL) 132 sc->sc_frequency = clk_get_rate(clk); 133 } 134 if (sc->sc_frequency == 0) { 135 aprint_error(": couldn't get frequency\n"); 136 return; 137 } 138 139 sc->sc_type = config->type; 140 sc->enable = config->enable; 141 sc->disable = config->disable; 142 143 error = bus_space_map(bst, addr, size, 0, &bsh); 144 if (error) { 145 aprint_error(": couldn't map %#" PRIx64 ": %d", 146 (uint64_t)addr, error); 147 return; 148 } 149 150 com_init_regs_stride(&sc->sc_regs, bst, bsh, addr, reg_shift); 151 152 if (config->enable != NULL) { 153 sc->enable(sc); 154 sc->enabled = 1; 155 } 156 157 com_attach_subr(sc); 158 159 if (!fdtbus_intr_str(faa->faa_phandle, 0, intrstr, sizeof(intrstr))) { 160 aprint_error_dev(self, "failed to decode interrupt\n"); 161 return; 162 } 163 164 ih = fdtbus_intr_establish_xname(faa->faa_phandle, 0, IPL_SERIAL, 165 FDT_INTR_MPSAFE, comintr, sc, device_xname(self)); 166 if (ih == NULL) { 167 aprint_error_dev(self, "failed to establish interrupt on %s\n", 168 intrstr); 169 return; 170 } 171 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 172 } 173 174 /* 175 * Console support 176 */ 177 178 static int 179 ns8250_uart_console_match(int phandle) 180 { 181 return of_compatible_match(phandle, compat_data); 182 } 183 184 static void 185 ns8250_uart_console_consinit(struct fdt_attach_args *faa, u_int uart_freq) 186 { 187 const int phandle = faa->faa_phandle; 188 bus_space_tag_t bst = faa->faa_bst; 189 bus_space_handle_t dummy_bsh; 190 struct com_regs regs; 191 bus_addr_t addr; 192 tcflag_t flags; 193 u_int reg_shift; 194 int speed; 195 196 const struct ns8250_config *config = 197 of_compatible_lookup(phandle, compat_data)->data; 198 199 fdtbus_get_reg(phandle, 0, &addr, NULL); 200 speed = fdtbus_get_stdout_speed(); 201 if (speed < 0) 202 speed = 115200; /* default */ 203 flags = fdtbus_get_stdout_flags(); 204 205 reg_shift = fdtbus_get_reg_shift(phandle, 0); 206 207 memset(&dummy_bsh, 0, sizeof(dummy_bsh)); 208 com_init_regs_stride(®s, bst, dummy_bsh, addr, reg_shift); 209 210 if (comcnattach1(®s, speed, uart_freq, config->type, flags)) 211 panic("Cannot initialize ns8250 console"); 212 } 213 214 static const struct fdt_console ns8250_uart_console = { 215 .match = ns8250_uart_console_match, 216 .consinit = ns8250_uart_console_consinit, 217 }; 218 219 FDT_CONSOLE(ns8250_uart, &ns8250_uart_console); 220
Indexes created Sun Oct 25 00:26:45 UTC 2026