gic_fdt.c revision 1.3
1 /* $NetBSD: gic_fdt.c,v 1.3 2017/05/28 00:40:20 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015-2017 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 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 1.3 2017/05/28 00:40:20 jmcneill 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 #include <arm/cortex/mpcore_var.h> 42 43 #include <dev/fdt/fdtvar.h> 44 45 static int gic_fdt_match(device_t, cfdata_t, void *); 46 static void gic_fdt_attach(device_t, device_t, void *); 47 48 static void * gic_fdt_establish(device_t, u_int *, int, int, 49 int (*)(void *), void *); 50 static void gic_fdt_disestablish(device_t, void *); 51 static bool gic_fdt_intrstr(device_t, u_int *, char *, size_t); 52 53 struct fdtbus_interrupt_controller_func gic_fdt_funcs = { 54 .establish = gic_fdt_establish, 55 .disestablish = gic_fdt_disestablish, 56 .intrstr = gic_fdt_intrstr 57 }; 58 59 struct gic_fdt_softc { 60 device_t sc_dev; 61 int sc_phandle; 62 }; 63 64 CFATTACH_DECL_NEW(gic_fdt, sizeof(struct gic_fdt_softc), 65 gic_fdt_match, gic_fdt_attach, NULL, NULL); 66 67 static int 68 gic_fdt_match(device_t parent, cfdata_t cf, void *aux) 69 { 70 const char * const compatible[] = { 71 "arm,gic-400", 72 "arm,cortex-a15-gic", 73 "arm,cortex-a9-gic", 74 "arm,cortex-a7-gic", 75 NULL 76 }; 77 struct fdt_attach_args * const faa = aux; 78 79 return of_compatible(faa->faa_phandle, compatible) >= 0; 80 } 81 82 static void 83 gic_fdt_attach(device_t parent, device_t self, void *aux) 84 { 85 struct gic_fdt_softc * const sc = device_private(self); 86 struct fdt_attach_args * const faa = aux; 87 bus_addr_t addr_d, addr_c; 88 bus_size_t size_d, size_c; 89 bus_space_handle_t bsh; 90 int error; 91 92 sc->sc_dev = self; 93 sc->sc_phandle = faa->faa_phandle; 94 95 error = fdtbus_register_interrupt_controller(self, faa->faa_phandle, 96 &gic_fdt_funcs); 97 if (error) { 98 aprint_error(": couldn't register with fdtbus: %d\n", error); 99 return; 100 } 101 102 aprint_naive("\n"); 103 aprint_normal(": GIC\n"); 104 105 if (fdtbus_get_reg(sc->sc_phandle, 0, &addr_d, &size_d) != 0) { 106 aprint_error(": couldn't get distributor address\n"); 107 return; 108 } 109 if (fdtbus_get_reg(sc->sc_phandle, 1, &addr_c, &size_c) != 0) { 110 aprint_error(": couldn't get cpu interface address\n"); 111 return; 112 } 113 114 const bus_addr_t addr = addr_d; 115 const bus_size_t size = (addr_c + size_c) - addr_d; 116 117 error = bus_space_map(faa->faa_bst, addr, size, 0, &bsh); 118 if (error) { 119 aprint_error(": couldn't map registers: %d\n", error); 120 return; 121 } 122 123 struct mpcore_attach_args mpcaa = { 124 .mpcaa_name = "armgic", 125 .mpcaa_memt = faa->faa_bst, 126 .mpcaa_memh = bsh, 127 .mpcaa_off1 = 0, 128 .mpcaa_off2 = addr_c - addr_d 129 }; 130 131 config_found(self, &mpcaa, NULL); 132 } 133 134 static void * 135 gic_fdt_establish(device_t dev, u_int *specifier, int ipl, int flags, 136 int (*func)(void *), void *arg) 137 { 138 int iflags = (flags & FDT_INTR_MPSAFE) ? IST_MPSAFE : 0; 139 140 /* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */ 141 /* 2nd cell is the interrupt number */ 142 /* 3rd cell is flags */ 143 144 const u_int type = be32toh(specifier[0]); 145 const u_int intr = be32toh(specifier[1]); 146 const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr); 147 const u_int trig = be32toh(specifier[2]) & 0xf; 148 const u_int level = (trig & 0x3) ? IST_EDGE : IST_LEVEL; 149 150 return intr_establish(irq, ipl, level | iflags, func, arg); 151 } 152 153 static void 154 gic_fdt_disestablish(device_t dev, void *ih) 155 { 156 intr_disestablish(ih); 157 } 158 159 static bool 160 gic_fdt_intrstr(device_t dev, u_int *specifier, char *buf, size_t buflen) 161 { 162 /* 1st cell is the interrupt type; 0 is SPI, 1 is PPI */ 163 /* 2nd cell is the interrupt number */ 164 /* 3rd cell is flags */ 165 166 if (!specifier) 167 return false; 168 const u_int type = be32toh(specifier[0]); 169 const u_int intr = be32toh(specifier[1]); 170 const u_int irq = type == 0 ? IRQ_SPI(intr) : IRQ_PPI(intr); 171 172 snprintf(buf, buflen, "GIC irq %d", irq); 173 174 return true; 175 } 176
Indexes created Thu Oct 02 14:10:14 GMT 2025