1 /* $NetBSD: plcom_fdt.c,v 1.3 2018/10/23 09:15:35 jmcneill 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 1.3 2018/10/23 09:15:35 jmcneill 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 char * const compatible[] = { "arm,pl011", NULL }; 47 48 CFATTACH_DECL_NEW(plcom_fdt, sizeof(struct plcom_softc), 49 plcom_fdt_match, plcom_fdt_attach, NULL, NULL); 50 51 static int 52 plcom_fdt_match(device_t parent, cfdata_t cf, void *aux) 53 { 54 struct fdt_attach_args * const faa = aux; 55 56 return of_compatible(faa->faa_phandle, compatible) >= 0; 57 } 58 59 static void 60 plcom_fdt_attach(device_t parent, device_t self, void *aux) 61 { 62 struct plcom_softc * const sc = device_private(self); 63 struct fdt_attach_args * const faa = aux; 64 const int phandle = faa->faa_phandle; 65 char intrstr[128]; 66 struct clk *clk; 67 bus_addr_t addr; 68 bus_size_t size; 69 void *ih; 70 71 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 72 aprint_error(": missing 'reg' property\n"); 73 return; 74 } 75 76 if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) { 77 aprint_error(": failed to decode interrupt\n"); 78 return; 79 } 80 81 sc->sc_dev = self; 82 83 /* Enable clocks */ 84 for (int i = 0; (clk = fdtbus_clock_get_index(phandle, i)); i++) { 85 if (clk_enable(clk) != 0) { 86 aprint_error(": failed to enable clock #%d\n", i); 87 return; 88 } 89 /* First clock is UARTCLK */ 90 if (i == 0) 91 sc->sc_frequency = clk_get_rate(clk); 92 } 93 94 sc->sc_hwflags = PLCOM_HW_TXFIFO_DISABLE; 95 sc->sc_swflags = 0; 96 97 sc->sc_pi.pi_type = PLCOM_TYPE_PL011; 98 sc->sc_pi.pi_flags = PLC_FLAG_32BIT_ACCESS; 99 sc->sc_pi.pi_iot = faa->faa_bst; 100 sc->sc_pi.pi_iobase = addr; 101 if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_pi.pi_ioh)) { 102 aprint_error(": couldn't map device\n"); 103 return; 104 } 105 106 aprint_naive("\n"); 107 aprint_normal(": ARM PL011 UART\n"); 108 109 plcom_attach_subr(sc); 110 111 aprint_normal_dev(self, "interrupting on %s\n", intrstr); 112 113 ih = fdtbus_intr_establish(phandle, 0, IPL_SERIAL, FDT_INTR_MPSAFE, 114 plcomintr, sc); 115 if (ih == NULL) { 116 aprint_error_dev(self, "couldn't install interrupt handler\n"); 117 return; 118 } 119 } 120 121 static int 122 plcom_fdt_console_match(int phandle) 123 { 124 return of_match_compatible(phandle, compatible); 125 } 126 127 static void 128 plcom_fdt_console_consinit(struct fdt_attach_args *faa, u_int uart_freq) 129 { 130 static struct plcom_instance pi; 131 bus_addr_t addr; 132 bus_size_t size; 133 tcflag_t flags; 134 int speed; 135 136 if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) 137 return; 138 139 pi.pi_type = PLCOM_TYPE_PL011; 140 pi.pi_flags = PLC_FLAG_32BIT_ACCESS; 141 pi.pi_iot = faa->faa_bst; 142 pi.pi_iobase = addr; 143 pi.pi_size = size; 144 145 speed = fdtbus_get_stdout_speed(); 146 if (speed < 0) 147 speed = 115200; 148 flags = fdtbus_get_stdout_flags(); 149 150 plcomcnattach(&pi, speed, uart_freq, flags, -1); 151 } 152 153 static const struct fdt_console plcom_fdt_console = { 154 .match = plcom_fdt_console_match, 155 .consinit = plcom_fdt_console_consinit, 156 }; 157 158 FDT_CONSOLE(plcom_fdt, &plcom_fdt_console); 159