1 /* $NetBSD: gic_fdt.c,v 1.2 2016/01/05 21:53:48 marty Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 Jared D. 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: gic_fdt.c,v 1.2 2016/01/05 21:53:48 marty Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/device.h> 35 #include <sys/intr.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/kmem.h> 39 40 #include <arm/cortex/gic_intr.h> 41 42 #include <dev/fdt/fdtvar.h> 43 44 static int gic_fdt_match(device_t, cfdata_t, void *); 45 static void gic_fdt_attach(device_t, device_t, void *); 46 47 static void * gic_fdt_establish(device_t, u_int *, int, int, 48 int (*)(void *), void *); 49 static void gic_fdt_disestablish(device_t, void *); 50 static bool gic_fdt_intrstr(device_t, u_int *, char *, size_t); 51 52 struct fdtbus_interrupt_controller_func gic_fdt_funcs = { 53 .establish = gic_fdt_establish, 54 .disestablish = gic_fdt_disestablish, 55 .intrstr = gic_fdt_intrstr 56 }; 57 58 struct gic_fdt_softc { 59 device_t sc_dev; 60 int sc_phandle; 61 }; 62 63 CFATTACH_DECL_NEW(gic_fdt, sizeof(struct gic_fdt_softc), 64 gic_fdt_match, gic_fdt_attach, NULL, NULL); 65 66 static int 67 gic_fdt_match(device_t parent, cfdata_t cf, void *aux) 68 { 69 const char * const compatible[] = { 70 "arm,gic-400", 71 "arm,cortex-a15-gic", 72 "arm,cortex-a9-gic", 73 "arm,cortex-a7-gic", 74 NULL 75 }; 76 struct fdt_attach_args * const faa = aux; 77 78 return of_compatible(faa->faa_phandle, compatible) >= 0; 79 } 80 81 static void 82 gic_fdt_attach(device_t parent, device_t self, void *aux) 83 { 84 struct gic_fdt_softc * const sc = device_private(self); 85 struct fdt_attach_args * const faa = aux; 86 int error; 87 88 sc->sc_dev = self; 89 sc->sc_phandle = faa->faa_phandle; 90 91 error = fdtbus_register_interrupt_controller(self, faa->faa_phandle, 92 &gic_fdt_funcs); 93 if (error) { 94 aprint_error(": couldn't register with fdtbus: %d\n", error); 95 return; 96 } 97 98 aprint_naive("\n"); 99 aprint_normal(": GIC\n"); 100 } 101 102 static void * 103 gic_fdt_establish(device_t dev, u_int *specifier, int ipl, int flags, 104 int (*func)(void *), void *arg) 105 { 106 int iflags = (flags & FDT_INTR_MPSAFE) ? IST_MPSAFE : 0; 107 108 /* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */ 109 /* 2nd cell is the interrupt number */ 110 /* 3rd cell is flags */ 111 112 const u_int type = be32toh(specifier[0]); 113 const u_int intr = be32toh(specifier[1]); 114 const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr); 115 const u_int trig = be32toh(specifier[2]) & 0xf; 116 const u_int level = (trig & 0x3) ? IST_EDGE : IST_LEVEL; 117 118 return intr_establish(irq, ipl, level | iflags, func, arg); 119 } 120 121 static void 122 gic_fdt_disestablish(device_t dev, void *ih) 123 { 124 intr_disestablish(ih); 125 } 126 127 static bool 128 gic_fdt_intrstr(device_t dev, u_int *specifier, char *buf, size_t buflen) 129 { 130 /* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */ 131 /* 2nd cell is the interrupt number */ 132 /* 3rd cell is flags */ 133 134 if (!specifier) 135 return false; 136 const u_int type = be32toh(specifier[0]); 137 const u_int intr = be32toh(specifier[1]); 138 const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr); 139 140 snprintf(buf, buflen, "GIC irq %d", irq); 141 142 return true; 143 } 144