Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/mips/ingenic/jz4780_uart.c
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1 /*- 2 * Copyright (c) 2013 Ian Lepore 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "opt_platform.h" 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/12.0/sys/mips/ingenic/jz4780_uart.c 338074 2018-08-19 21:10:21Z mmacy $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/sysctl.h> 39 #include <machine/bus.h> 40 41 #include <dev/extres/clk/clk.h> 42 #include <dev/fdt/fdt_common.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 #include <dev/uart/uart.h> 46 #include <dev/uart/uart_cpu.h> 47 #include <dev/uart/uart_cpu_fdt.h> 48 #include <dev/uart/uart_bus.h> 49 #include <dev/uart/uart_dev_ns8250.h> 50 #include <dev/ic/ns16550.h> 51 #include "uart_if.h" 52 53 /* 54 * High-level UART interface. 55 */ 56 struct jz4780_uart_softc { 57 struct ns8250_softc ns8250_base; 58 clk_t clk_mod; 59 clk_t clk_baud; 60 }; 61 62 static int 63 jz4780_bus_attach(struct uart_softc *sc) 64 { 65 struct ns8250_softc *ns8250; 66 struct uart_bas *bas; 67 int rv; 68 69 ns8250 = (struct ns8250_softc *)sc; 70 bas = &sc->sc_bas; 71 72 rv = ns8250_bus_attach(sc); 73 if (rv != 0) 74 return (0); 75 76 /* Configure uart to use extra IER_RXTMOUT bit */ 77 ns8250->ier_rxbits = IER_RXTMOUT | IER_EMSC | IER_ERLS | IER_ERXRDY; 78 ns8250->ier_mask = ~(ns8250->ier_rxbits); 79 ns8250->ier = uart_getreg(bas, REG_IER) & ns8250->ier_mask; 80 ns8250->ier |= ns8250->ier_rxbits; 81 uart_setreg(bas, REG_IER, ns8250->ier); 82 uart_barrier(bas); 83 return (0); 84 } 85 86 static kobj_method_t jz4780_uart_methods[] = { 87 KOBJMETHOD(uart_probe, ns8250_bus_probe), 88 KOBJMETHOD(uart_attach, jz4780_bus_attach), 89 KOBJMETHOD(uart_detach, ns8250_bus_detach), 90 KOBJMETHOD(uart_flush, ns8250_bus_flush), 91 KOBJMETHOD(uart_getsig, ns8250_bus_getsig), 92 KOBJMETHOD(uart_ioctl, ns8250_bus_ioctl), 93 KOBJMETHOD(uart_ipend, ns8250_bus_ipend), 94 KOBJMETHOD(uart_param, ns8250_bus_param), 95 KOBJMETHOD(uart_receive, ns8250_bus_receive), 96 KOBJMETHOD(uart_setsig, ns8250_bus_setsig), 97 KOBJMETHOD(uart_transmit, ns8250_bus_transmit), 98 KOBJMETHOD(uart_grab, ns8250_bus_grab), 99 KOBJMETHOD(uart_ungrab, ns8250_bus_ungrab), 100 KOBJMETHOD_END 101 }; 102 103 static struct uart_class jz4780_uart_class = { 104 "jz4780_uart_class", 105 jz4780_uart_methods, 106 sizeof(struct jz4780_uart_softc), 107 .uc_ops = &uart_ns8250_ops, 108 .uc_range = 8, 109 .uc_rclk = 0, 110 }; 111 112 /* Compatible devices. */ 113 static struct ofw_compat_data compat_data[] = { 114 {"ingenic,jz4780-uart", (uintptr_t)&jz4780_uart_class}, 115 {NULL, (uintptr_t)NULL}, 116 }; 117 118 UART_FDT_CLASS(compat_data); 119 120 /* 121 * UART Driver interface. 122 */ 123 static int 124 jz4780_uart_get_shift(device_t dev) 125 { 126 phandle_t node; 127 pcell_t shift; 128 129 node = ofw_bus_get_node(dev); 130 if ((OF_getencprop(node, "reg-shift", &shift, sizeof(shift))) <= 0) 131 shift = 2; 132 return ((int)shift); 133 } 134 135 static int 136 jz4780_uart_probe(device_t dev) 137 { 138 struct jz4780_uart_softc *sc; 139 uint64_t freq; 140 int shift; 141 int rv; 142 const struct ofw_compat_data *cd; 143 144 sc = device_get_softc(dev); 145 if (!ofw_bus_status_okay(dev)) 146 return (ENXIO); 147 cd = ofw_bus_search_compatible(dev, compat_data); 148 if (cd->ocd_data == 0) 149 return (ENXIO); 150 151 /* Figure out clock setup */ 152 rv = clk_get_by_ofw_name(dev, 0, "module", &sc->clk_mod); 153 if (rv != 0) { 154 device_printf(dev, "Cannot get UART clock: %d\n", rv); 155 return (ENXIO); 156 } 157 rv = clk_enable(sc->clk_mod); 158 if (rv != 0) { 159 device_printf(dev, "Cannot enable UART clock: %d\n", rv); 160 return (ENXIO); 161 } 162 rv = clk_get_by_ofw_name(dev, 0, "baud", &sc->clk_baud); 163 if (rv != 0) { 164 device_printf(dev, "Cannot get UART clock: %d\n", rv); 165 return (ENXIO); 166 } 167 rv = clk_enable(sc->clk_baud); 168 if (rv != 0) { 169 device_printf(dev, "Cannot enable UART clock: %d\n", rv); 170 return (ENXIO); 171 } 172 rv = clk_get_freq(sc->clk_baud, &freq); 173 if (rv != 0) { 174 device_printf(dev, "Cannot determine UART clock frequency: %d\n", rv); 175 return (ENXIO); 176 } 177 178 if (bootverbose) 179 device_printf(dev, "got UART clock: %lld\n", freq); 180 sc->ns8250_base.base.sc_class = (struct uart_class *)cd->ocd_data; 181 shift = jz4780_uart_get_shift(dev); 182 return (uart_bus_probe(dev, shift, 0, (int)freq, 0, 0, 0)); 183 } 184 185 static int 186 jz4780_uart_detach(device_t dev) 187 { 188 struct jz4780_uart_softc *sc; 189 int rv; 190 191 rv = uart_bus_detach(dev); 192 if (rv != 0) 193 return (rv); 194 195 sc = device_get_softc(dev); 196 if (sc->clk_mod != NULL) { 197 clk_release(sc->clk_mod); 198 } 199 if (sc->clk_baud != NULL) { 200 clk_release(sc->clk_baud); 201 } 202 return (0); 203 } 204 205 static device_method_t jz4780_uart_bus_methods[] = { 206 /* Device interface */ 207 DEVMETHOD(device_probe, jz4780_uart_probe), 208 DEVMETHOD(device_attach, uart_bus_attach), 209 DEVMETHOD(device_detach, jz4780_uart_detach), 210 { 0, 0 } 211 }; 212 213 static driver_t jz4780_uart_driver = { 214 uart_driver_name, 215 jz4780_uart_bus_methods, 216 sizeof(struct jz4780_uart_softc), 217 }; 218 219 DRIVER_MODULE(jz4780_uart, simplebus, jz4780_uart_driver, uart_devclass, 220 0, 0);
Cache object: ad652c9a1c46e92c09cc7d758cd33f5f
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