1 /*- 2 * Copyright (c) 2012 Damjan Marion <dmarion@Freebsd.org> 3 * All rights reserved. 4 * 5 * Based on OMAP3 INTC code by Ben Gray 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 AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, 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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/ktr.h> 38 #include <sys/module.h> 39 #include <sys/rman.h> 40 #include <machine/bus.h> 41 #include <machine/intr.h> 42 43 #include <dev/fdt/fdt_common.h> 44 #include <dev/ofw/openfirm.h> 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/ofw_bus_subr.h> 47 48 #define INTC_PENDING_BASIC 0x00 49 #define INTC_PENDING_BANK1 0x04 50 #define INTC_PENDING_BANK2 0x08 51 #define INTC_FIQ_CONTROL 0x0C 52 #define INTC_ENABLE_BANK1 0x10 53 #define INTC_ENABLE_BANK2 0x14 54 #define INTC_ENABLE_BASIC 0x18 55 #define INTC_DISABLE_BANK1 0x1C 56 #define INTC_DISABLE_BANK2 0x20 57 #define INTC_DISABLE_BASIC 0x24 58 59 #define BANK1_START 8 60 #define BANK1_END (BANK1_START + 32 - 1) 61 #define BANK2_START (BANK1_START + 32) 62 #define BANK2_END (BANK2_START + 32 - 1) 63 64 #define IS_IRQ_BASIC(n) (((n) >= 0) && ((n) < BANK1_START)) 65 #define IS_IRQ_BANK1(n) (((n) >= BANK1_START) && ((n) <= BANK1_END)) 66 #define IS_IRQ_BANK2(n) (((n) >= BANK2_START) && ((n) <= BANK2_END)) 67 #define IRQ_BANK1(n) ((n) - BANK1_START) 68 #define IRQ_BANK2(n) ((n) - BANK2_START) 69 70 #ifdef DEBUG 71 #define dprintf(fmt, args...) printf(fmt, ##args) 72 #else 73 #define dprintf(fmt, args...) 74 #endif 75 76 struct bcm_intc_softc { 77 device_t sc_dev; 78 struct resource * intc_res; 79 bus_space_tag_t intc_bst; 80 bus_space_handle_t intc_bsh; 81 }; 82 83 static struct bcm_intc_softc *bcm_intc_sc = NULL; 84 85 #define intc_read_4(reg) \ 86 bus_space_read_4(bcm_intc_sc->intc_bst, bcm_intc_sc->intc_bsh, reg) 87 #define intc_write_4(reg, val) \ 88 bus_space_write_4(bcm_intc_sc->intc_bst, bcm_intc_sc->intc_bsh, reg, val) 89 90 static int 91 bcm_intc_probe(device_t dev) 92 { 93 if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-armctrl-ic")) 94 return (ENXIO); 95 device_set_desc(dev, "BCM2835 Interrupt Controller"); 96 return (BUS_PROBE_DEFAULT); 97 } 98 99 static int 100 bcm_intc_attach(device_t dev) 101 { 102 struct bcm_intc_softc *sc = device_get_softc(dev); 103 int rid = 0; 104 105 sc->sc_dev = dev; 106 107 if (bcm_intc_sc) 108 return (ENXIO); 109 110 sc->intc_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 111 if (sc->intc_res == NULL) { 112 device_printf(dev, "could not allocate memory resource\n"); 113 return (ENXIO); 114 } 115 116 sc->intc_bst = rman_get_bustag(sc->intc_res); 117 sc->intc_bsh = rman_get_bushandle(sc->intc_res); 118 119 bcm_intc_sc = sc; 120 121 return (0); 122 } 123 124 static device_method_t bcm_intc_methods[] = { 125 DEVMETHOD(device_probe, bcm_intc_probe), 126 DEVMETHOD(device_attach, bcm_intc_attach), 127 { 0, 0 } 128 }; 129 130 static driver_t bcm_intc_driver = { 131 "intc", 132 bcm_intc_methods, 133 sizeof(struct bcm_intc_softc), 134 }; 135 136 static devclass_t bcm_intc_devclass; 137 138 DRIVER_MODULE(intc, simplebus, bcm_intc_driver, bcm_intc_devclass, 0, 0); 139 140 int 141 arm_get_next_irq(int last_irq) 142 { 143 uint32_t pending; 144 int32_t irq = last_irq + 1; 145 146 /* Sanity check */ 147 if (irq < 0) 148 irq = 0; 149 150 /* TODO: should we mask last_irq? */ 151 pending = intc_read_4(INTC_PENDING_BASIC); 152 while (irq < BANK1_START) { 153 if (pending & (1 << irq)) 154 return irq; 155 irq++; 156 } 157 158 pending = intc_read_4(INTC_PENDING_BANK1); 159 while (irq < BANK2_START) { 160 if (pending & (1 << IRQ_BANK1(irq))) 161 return irq; 162 irq++; 163 } 164 165 pending = intc_read_4(INTC_PENDING_BANK2); 166 while (irq <= BANK2_END) { 167 if (pending & (1 << IRQ_BANK2(irq))) 168 return irq; 169 irq++; 170 } 171 172 return (-1); 173 } 174 175 void 176 arm_mask_irq(uintptr_t nb) 177 { 178 dprintf("%s: %d\n", __func__, nb); 179 180 if (IS_IRQ_BASIC(nb)) 181 intc_write_4(INTC_DISABLE_BASIC, (1 << nb)); 182 else if (IS_IRQ_BANK1(nb)) 183 intc_write_4(INTC_DISABLE_BANK1, (1 << IRQ_BANK1(nb))); 184 else if (IS_IRQ_BANK2(nb)) 185 intc_write_4(INTC_DISABLE_BANK2, (1 << IRQ_BANK2(nb))); 186 else 187 printf("arm_mask_irq: Invalid IRQ number: %d\n", nb); 188 } 189 190 void 191 arm_unmask_irq(uintptr_t nb) 192 { 193 dprintf("%s: %d\n", __func__, nb); 194 195 if (IS_IRQ_BASIC(nb)) 196 intc_write_4(INTC_ENABLE_BASIC, (1 << nb)); 197 else if (IS_IRQ_BANK1(nb)) 198 intc_write_4(INTC_ENABLE_BANK1, (1 << IRQ_BANK1(nb))); 199 else if (IS_IRQ_BANK2(nb)) 200 intc_write_4(INTC_ENABLE_BANK2, (1 << IRQ_BANK2(nb))); 201 else 202 printf("arm_mask_irq: Invalid IRQ number: %d\n", nb); 203 } 204