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_REVISION 0x00 49 #define INTC_SYSCONFIG 0x10 50 #define INTC_SYSSTATUS 0x14 51 #define INTC_SIR_IRQ 0x40 52 #define INTC_CONTROL 0x48 53 #define INTC_THRESHOLD 0x68 54 #define INTC_MIR_CLEAR(x) (0x88 + ((x) * 0x20)) 55 #define INTC_MIR_SET(x) (0x8C + ((x) * 0x20)) 56 #define INTC_ISR_SET(x) (0x90 + ((x) * 0x20)) 57 #define INTC_ISR_CLEAR(x) (0x94 + ((x) * 0x20)) 58 59 struct ti_aintc_softc { 60 device_t sc_dev; 61 struct resource * aintc_res[3]; 62 bus_space_tag_t aintc_bst; 63 bus_space_handle_t aintc_bsh; 64 uint8_t ver; 65 }; 66 67 static struct resource_spec ti_aintc_spec[] = { 68 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 69 { -1, 0 } 70 }; 71 72 static struct ti_aintc_softc *ti_aintc_sc = NULL; 73 74 #define aintc_read_4(_sc, reg) \ 75 bus_space_read_4((_sc)->aintc_bst, (_sc)->aintc_bsh, (reg)) 76 #define aintc_write_4(_sc, reg, val) \ 77 bus_space_write_4((_sc)->aintc_bst, (_sc)->aintc_bsh, (reg), (val)) 78 79 /* List of compatible strings for FDT tree */ 80 static struct ofw_compat_data compat_data[] = { 81 {"ti,am33xx-intc", 1}, 82 {"ti,omap2-intc", 1}, 83 {NULL, 0}, 84 }; 85 86 static void 87 aintc_post_filter(void *arg) 88 { 89 90 arm_irq_memory_barrier(0); 91 aintc_write_4(ti_aintc_sc, INTC_CONTROL, 1); /* EOI */ 92 } 93 94 static int 95 ti_aintc_probe(device_t dev) 96 { 97 if (!ofw_bus_status_okay(dev)) 98 return (ENXIO); 99 100 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 101 return (ENXIO); 102 103 device_set_desc(dev, "TI AINTC Interrupt Controller"); 104 return (BUS_PROBE_DEFAULT); 105 } 106 107 static int 108 ti_aintc_attach(device_t dev) 109 { 110 struct ti_aintc_softc *sc = device_get_softc(dev); 111 uint32_t x; 112 113 sc->sc_dev = dev; 114 115 if (ti_aintc_sc) 116 return (ENXIO); 117 118 if (bus_alloc_resources(dev, ti_aintc_spec, sc->aintc_res)) { 119 device_printf(dev, "could not allocate resources\n"); 120 return (ENXIO); 121 } 122 123 sc->aintc_bst = rman_get_bustag(sc->aintc_res[0]); 124 sc->aintc_bsh = rman_get_bushandle(sc->aintc_res[0]); 125 126 ti_aintc_sc = sc; 127 128 x = aintc_read_4(sc, INTC_REVISION); 129 device_printf(dev, "Revision %u.%u\n",(x >> 4) & 0xF, x & 0xF); 130 131 /* SoftReset */ 132 aintc_write_4(sc, INTC_SYSCONFIG, 2); 133 134 /* Wait for reset to complete */ 135 while(!(aintc_read_4(sc, INTC_SYSSTATUS) & 1)); 136 137 /*Set Priority Threshold */ 138 aintc_write_4(sc, INTC_THRESHOLD, 0xFF); 139 140 arm_post_filter = aintc_post_filter; 141 142 return (0); 143 } 144 145 static device_method_t ti_aintc_methods[] = { 146 DEVMETHOD(device_probe, ti_aintc_probe), 147 DEVMETHOD(device_attach, ti_aintc_attach), 148 { 0, 0 } 149 }; 150 151 static driver_t ti_aintc_driver = { 152 "aintc", 153 ti_aintc_methods, 154 sizeof(struct ti_aintc_softc), 155 }; 156 157 static devclass_t ti_aintc_devclass; 158 159 DRIVER_MODULE(aintc, simplebus, ti_aintc_driver, ti_aintc_devclass, 0, 0); 160 161 int 162 arm_get_next_irq(int last_irq) 163 { 164 struct ti_aintc_softc *sc = ti_aintc_sc; 165 uint32_t active_irq; 166 167 /* Get the next active interrupt */ 168 active_irq = aintc_read_4(sc, INTC_SIR_IRQ); 169 170 /* Check for spurious interrupt */ 171 if ((active_irq & 0xffffff80)) { 172 device_printf(sc->sc_dev, 173 "Spurious interrupt detected (0x%08x)\n", active_irq); 174 aintc_write_4(sc, INTC_SIR_IRQ, 0); 175 return -1; 176 } 177 178 if (active_irq != last_irq) 179 return active_irq; 180 else 181 return -1; 182 } 183 184 void 185 arm_mask_irq(uintptr_t nb) 186 { 187 struct ti_aintc_softc *sc = ti_aintc_sc; 188 189 aintc_write_4(sc, INTC_MIR_SET(nb >> 5), (1UL << (nb & 0x1F))); 190 aintc_write_4(sc, INTC_CONTROL, 1); /* EOI */ 191 } 192 193 void 194 arm_unmask_irq(uintptr_t nb) 195 { 196 struct ti_aintc_softc *sc = ti_aintc_sc; 197 198 arm_irq_memory_barrier(nb); 199 aintc_write_4(sc, INTC_MIR_CLEAR(nb >> 5), (1UL << (nb & 0x1F))); 200 } 201