1 /* $NetBSD: plcom_fdt.c,v 1.5 2021/01/27 03:10:19 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 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 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: plcom_fdt.c,v 1.5 2021/01/27 03:10:19 thorpej Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 38 #include <dev/fdt/fdtvar.h> 39 40 #include <evbarm/dev/plcomreg.h> 41 #include <evbarm/dev/plcomvar.h> 42 43 static int plcom_fdt_match(device_t, cfdata_t, void *); 44 static void plcom_fdt_attach(device_t, device_t, void *); 45 46 static const struct device_compatible_entry compat_data[] = { 47 { .compat = "arm,pl011" }, 48 DEVICE_COMPAT_EOL 49 }; 50 51 CFATTACH_DECL_NEW(plcom_fdt, sizeof(struct plcom_softc), 52 plcom_fdt_match, plcom_fdt_attach, NULL, NULL); 53 54 static int 55 plcom_fdt_match(device_t parent, cfdata_t cf, void *aux) 56 { 57 struct fdt_attach_args * const faa = aux; 58 59 return of_compatible_match(faa->faa_phandle, compat_data); 60 } 61 62 static void 63 plcom_fdt_attach(device_t parent, device_t self, void *aux) 64 { 65 struct plcom_softc * const sc = device_private(self); 66 struct fdt_attach_args * const faa = aux; 67 const int phandle = faa->faa_phandle; 68 char intrstr[128]; 69 struct clk *clk; 70 bus_addr_t addr; 71 bus_size_t size; 72 void *ih; 73 74 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 75 aprint_error(": missing 'reg' property\n"); 76 return; 77 } 78 79 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 80 aprint_error(": failed to decode interrupt\n"); 81 return; 82 } 83 84 sc->sc_dev = self; 85 86 /* Enable clocks */ 87 for (int i = 0; (clk = fdtbus_clock_get_index(phandle, i)); i++) { 88 if (clk_enable(clk) != 0) { 89 aprint_error(": failed to enable clock #%d\n", i); 90 return; 91 } 92 /* First clock is UARTCLK */ 93 if (i == 0) 94 sc->sc_frequency = clk_get_rate(clk); 95 } 96 97 sc->sc_hwflags = PLCOM_HW_TXFIFO_DISABLE; 98 sc->sc_swflags = 0; 99 100 sc->sc_pi.pi_type = PLCOM_TYPE_PL011; 101 sc->sc_pi.pi_flags = PLC_FLAG_32BIT_ACCESS; 102 sc->sc_pi.pi_iot = faa->faa_bst; 103 sc->sc_pi.pi_iobase = addr; 104 if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_pi.pi_ioh)) { 105 aprint_error(": couldn't map device\n"); 106 return; 107 } 108 109 aprint_naive("\n"); 110 aprint_normal(": ARM PL011 UART\n"); 111 112 plcom_attach_subr(sc); 113 114 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 115 116 ih = fdtbus_intr_establish_xname(phandle, 0, IPL_SERIAL, FDT_INTR_MPSAFE, 117 plcomintr, sc, device_xname(self)); 118 if (ih == NULL) { 119 aprint_error_dev(self, "couldn't install interrupt handler\n"); 120 return; 121 } 122 } 123 124 static int 125 plcom_fdt_console_match(int phandle) 126 { 127 return of_compatible_match(phandle, compat_data); 128 } 129 130 static void 131 plcom_fdt_console_consinit(struct fdt_attach_args *faa, u_int uart_freq) 132 { 133 static struct plcom_instance pi; 134 bus_addr_t addr; 135 bus_size_t size; 136 tcflag_t flags; 137 int speed; 138 139 if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) 140 return; 141 142 pi.pi_type = PLCOM_TYPE_PL011; 143 pi.pi_flags = PLC_FLAG_32BIT_ACCESS; 144 pi.pi_iot = faa->faa_bst; 145 pi.pi_iobase = addr; 146 pi.pi_size = size; 147 148 speed = fdtbus_get_stdout_speed(); 149 if (speed < 0) 150 speed = 115200; 151 flags = fdtbus_get_stdout_flags(); 152 153 plcomcnattach(&pi, speed, uart_freq, flags, -1); 154 } 155 156 static const struct fdt_console plcom_fdt_console = { 157 .match = plcom_fdt_console_match, 158 .consinit = plcom_fdt_console_consinit, 159 }; 160 161 FDT_CONSOLE(plcom_fdt, &plcom_fdt_console); 162