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 73 static struct ti_aintc_softc *ti_aintc_sc = NULL; 74 75 #define aintc_read_4(reg) \ 76 bus_space_read_4(ti_aintc_sc->aintc_bst, ti_aintc_sc->aintc_bsh, reg) 77 #define aintc_write_4(reg, val) \ 78 bus_space_write_4(ti_aintc_sc->aintc_bst, ti_aintc_sc->aintc_bsh, reg, val) 79 80 81 static int 82 ti_aintc_probe(device_t dev) 83 { 84 if (!ofw_bus_is_compatible(dev, "ti,aintc")) 85 return (ENXIO); 86 device_set_desc(dev, "TI AINTC Interrupt Controller"); 87 return (BUS_PROBE_DEFAULT); 88 } 89 90 static int 91 ti_aintc_attach(device_t dev) 92 { 93 struct ti_aintc_softc *sc = device_get_softc(dev); 94 uint32_t x; 95 96 sc->sc_dev = dev; 97 98 if (ti_aintc_sc) 99 return (ENXIO); 100 101 if (bus_alloc_resources(dev, ti_aintc_spec, sc->aintc_res)) { 102 device_printf(dev, "could not allocate resources\n"); 103 return (ENXIO); 104 } 105 106 sc->aintc_bst = rman_get_bustag(sc->aintc_res[0]); 107 sc->aintc_bsh = rman_get_bushandle(sc->aintc_res[0]); 108 109 ti_aintc_sc = sc; 110 111 x = aintc_read_4(INTC_REVISION); 112 device_printf(dev, "Revision %u.%u\n",(x >> 4) & 0xF, x & 0xF); 113 114 /* SoftReset */ 115 aintc_write_4(INTC_SYSCONFIG, 2); 116 117 /* Wait for reset to complete */ 118 while(!(aintc_read_4(INTC_SYSSTATUS) & 1)); 119 120 /*Set Priority Threshold */ 121 aintc_write_4(INTC_THRESHOLD, 0xFF); 122 123 return (0); 124 } 125 126 static device_method_t ti_aintc_methods[] = { 127 DEVMETHOD(device_probe, ti_aintc_probe), 128 DEVMETHOD(device_attach, ti_aintc_attach), 129 { 0, 0 } 130 }; 131 132 static driver_t ti_aintc_driver = { 133 "aintc", 134 ti_aintc_methods, 135 sizeof(struct ti_aintc_softc), 136 }; 137 138 static devclass_t ti_aintc_devclass; 139 140 DRIVER_MODULE(aintc, simplebus, ti_aintc_driver, ti_aintc_devclass, 0, 0); 141 142 int 143 arm_get_next_irq(int last_irq) 144 { 145 uint32_t active_irq; 146 147 if (last_irq != -1) { 148 aintc_write_4(INTC_ISR_CLEAR(last_irq >> 5), 149 1UL << (last_irq & 0x1F)); 150 aintc_write_4(INTC_CONTROL,1); 151 } 152 153 /* Get the next active interrupt */ 154 active_irq = aintc_read_4(INTC_SIR_IRQ); 155 156 /* Check for spurious interrupt */ 157 if ((active_irq & 0xffffff80)) { 158 device_printf(ti_aintc_sc->sc_dev, 159 "Spurious interrupt detected (0x%08x)\n", active_irq); 160 aintc_write_4(INTC_SIR_IRQ, 0); 161 return -1; 162 } 163 164 if (active_irq != last_irq) 165 return active_irq; 166 else 167 return -1; 168 } 169 170 void 171 arm_mask_irq(uintptr_t nb) 172 { 173 aintc_write_4(INTC_MIR_SET(nb >> 5), (1UL << (nb & 0x1F))); 174 } 175 176 void 177 arm_unmask_irq(uintptr_t nb) 178 { 179 aintc_write_4(INTC_MIR_CLEAR(nb >> 5), (1UL << (nb & 0x1F))); 180 } 181