1 /*- 2 * Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 23 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24 * POSSIBILITY OF SUCH DAMAGE. 25 */ 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/conf.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/malloc.h> 36 #include <sys/rman.h> 37 #include <sys/event.h> 38 #include <sys/selinfo.h> 39 #include <machine/bus.h> 40 #include <machine/cpu.h> 41 #include <machine/frame.h> 42 #include <machine/intr.h> 43 44 #include <dev/fdt/fdt_common.h> 45 #include <dev/ofw/openfirm.h> 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <machine/bus.h> 50 #include <machine/fdt.h> 51 52 #include <arm/ti/ti_prcm.h> 53 #include <arm/ti/ti_pruss.h> 54 55 #define DEBUG 56 #ifdef DEBUG 57 #define DPRINTF(fmt, ...) do { \ 58 printf("%s: ", __func__); \ 59 printf(fmt, __VA_ARGS__); \ 60 } while (0) 61 #else 62 #define DPRINTF(fmt, ...) 63 #endif 64 65 static device_probe_t ti_pruss_probe; 66 static device_attach_t ti_pruss_attach; 67 static device_detach_t ti_pruss_detach; 68 static void ti_pruss_intr(void *); 69 static d_open_t ti_pruss_open; 70 static d_mmap_t ti_pruss_mmap; 71 static void ti_pruss_kq_read_detach(struct knote *); 72 static int ti_pruss_kq_read_event(struct knote *, long); 73 static d_kqfilter_t ti_pruss_kqfilter; 74 75 #define TI_PRUSS_IRQS 8 76 struct ti_pruss_softc { 77 struct mtx sc_mtx; 78 struct resource *sc_mem_res; 79 struct resource *sc_irq_res[TI_PRUSS_IRQS]; 80 void *sc_intr[TI_PRUSS_IRQS]; 81 bus_space_tag_t sc_bt; 82 bus_space_handle_t sc_bh; 83 struct cdev *sc_pdev; 84 struct selinfo sc_selinfo; 85 }; 86 87 static struct cdevsw ti_pruss_cdevsw = { 88 .d_version = D_VERSION, 89 .d_name = "ti_pruss", 90 .d_open = ti_pruss_open, 91 .d_mmap = ti_pruss_mmap, 92 .d_kqfilter = ti_pruss_kqfilter, 93 }; 94 95 static device_method_t ti_pruss_methods[] = { 96 DEVMETHOD(device_probe, ti_pruss_probe), 97 DEVMETHOD(device_attach, ti_pruss_attach), 98 DEVMETHOD(device_detach, ti_pruss_detach), 99 100 DEVMETHOD_END 101 }; 102 103 static driver_t ti_pruss_driver = { 104 "ti_pruss", 105 ti_pruss_methods, 106 sizeof(struct ti_pruss_softc) 107 }; 108 109 static devclass_t ti_pruss_devclass; 110 111 DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0); 112 113 static struct resource_spec ti_pruss_irq_spec[] = { 114 { SYS_RES_IRQ, 0, RF_ACTIVE }, 115 { SYS_RES_IRQ, 1, RF_ACTIVE }, 116 { SYS_RES_IRQ, 2, RF_ACTIVE }, 117 { SYS_RES_IRQ, 3, RF_ACTIVE }, 118 { SYS_RES_IRQ, 4, RF_ACTIVE }, 119 { SYS_RES_IRQ, 5, RF_ACTIVE }, 120 { SYS_RES_IRQ, 6, RF_ACTIVE }, 121 { SYS_RES_IRQ, 7, RF_ACTIVE }, 122 { -1, 0, 0 } 123 }; 124 125 static struct ti_pruss_irq_arg { 126 int irq; 127 struct ti_pruss_softc *sc; 128 } ti_pruss_irq_args[TI_PRUSS_IRQS]; 129 130 static __inline uint32_t 131 ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg) 132 { 133 return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg)); 134 } 135 136 static __inline void 137 ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val) 138 { 139 bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val); 140 } 141 142 static int 143 ti_pruss_probe(device_t dev) 144 { 145 146 if (!ofw_bus_status_okay(dev)) 147 return (ENXIO); 148 149 if (ofw_bus_is_compatible(dev, "ti,pruss-v1") || 150 ofw_bus_is_compatible(dev, "ti,pruss-v2")) { 151 device_set_desc(dev, "TI Programmable Realtime Unit Subsystem"); 152 return (BUS_PROBE_DEFAULT); 153 } 154 155 return (ENXIO); 156 } 157 158 static int 159 ti_pruss_attach(device_t dev) 160 { 161 struct ti_pruss_softc *sc; 162 int rid, i; 163 164 if (ti_prcm_clk_enable(PRUSS_CLK) != 0) { 165 device_printf(dev, "could not enable PRUSS clock\n"); 166 return (ENXIO); 167 } 168 sc = device_get_softc(dev); 169 rid = 0; 170 mtx_init(&sc->sc_mtx, "TI PRUSS", NULL, MTX_DEF); 171 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 172 RF_ACTIVE); 173 if (sc->sc_mem_res == NULL) { 174 device_printf(dev, "could not allocate memory resource\n"); 175 return (ENXIO); 176 } 177 sc->sc_bt = rman_get_bustag(sc->sc_mem_res); 178 sc->sc_bh = rman_get_bushandle(sc->sc_mem_res); 179 if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) { 180 device_printf(dev, "could not allocate interrupt resource\n"); 181 ti_pruss_detach(dev); 182 return (ENXIO); 183 } 184 for (i = 0; i < TI_PRUSS_IRQS; i++) { 185 ti_pruss_irq_args[i].irq = i; 186 ti_pruss_irq_args[i].sc = sc; 187 if (bus_setup_intr(dev, sc->sc_irq_res[i], 188 INTR_MPSAFE | INTR_TYPE_MISC, 189 NULL, ti_pruss_intr, &ti_pruss_irq_args[i], 190 &sc->sc_intr[i]) != 0) { 191 device_printf(dev, 192 "unable to setup the interrupt handler\n"); 193 ti_pruss_detach(dev); 194 return (ENXIO); 195 } 196 } 197 if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV) 198 device_printf(dev, "AM18xx PRU-ICSS\n"); 199 else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV) 200 device_printf(dev, "AM33xx PRU-ICSS\n"); 201 202 sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL, 203 0600, "pruss%d", device_get_unit(dev)); 204 sc->sc_pdev->si_drv1 = dev; 205 206 return (0); 207 } 208 209 static int 210 ti_pruss_detach(device_t dev) 211 { 212 struct ti_pruss_softc *sc; 213 int i; 214 215 sc = device_get_softc(dev); 216 for (i = 0; i < TI_PRUSS_IRQS; i++) { 217 if (sc->sc_intr[i]) 218 bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]); 219 if (sc->sc_irq_res[i]) 220 bus_release_resource(dev, SYS_RES_IRQ, 221 rman_get_rid(sc->sc_irq_res[i]), 222 sc->sc_irq_res[i]); 223 } 224 if (sc->sc_mem_res) 225 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res), 226 sc->sc_mem_res); 227 if (sc->sc_pdev) 228 destroy_dev(sc->sc_pdev); 229 230 return (0); 231 } 232 233 static void 234 ti_pruss_intr(void *arg) 235 { 236 struct ti_pruss_irq_arg *iap; 237 struct ti_pruss_softc *sc; 238 239 iap = arg; 240 sc = iap->sc; 241 DPRINTF("interrupt %p", sc); 242 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq); 243 } 244 245 static int 246 ti_pruss_open(struct cdev *cdev __unused, int oflags __unused, 247 int devtype __unused, struct thread *td __unused) 248 { 249 return (0); 250 } 251 252 static int 253 ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr, 254 int nprot, vm_memattr_t *memattr) 255 { 256 device_t dev = cdev->si_drv1; 257 struct ti_pruss_softc *sc = device_get_softc(dev); 258 259 if (offset > rman_get_size(sc->sc_mem_res)) 260 return (-1); 261 *paddr = rman_get_start(sc->sc_mem_res) + offset; 262 263 return (0); 264 } 265 266 static struct filterops ti_pruss_kq_read = { 267 .f_isfd = 1, 268 .f_detach = ti_pruss_kq_read_detach, 269 .f_event = ti_pruss_kq_read_event, 270 }; 271 272 static void 273 ti_pruss_kq_read_detach(struct knote *kn) 274 { 275 struct ti_pruss_softc *sc = kn->kn_hook; 276 277 knlist_remove(&sc->sc_selinfo.si_note, kn, 0); 278 } 279 280 static int 281 ti_pruss_kq_read_event(struct knote *kn, long hint) 282 { 283 kn->kn_data = hint; 284 285 return (hint); 286 } 287 288 static int 289 ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn) 290 { 291 device_t dev = cdev->si_drv1; 292 struct ti_pruss_softc *sc = device_get_softc(dev); 293 294 switch (kn->kn_filter) { 295 case EVFILT_READ: 296 kn->kn_hook = sc; 297 kn->kn_fop = &ti_pruss_kq_read; 298 knlist_add(&sc->sc_selinfo.si_note, kn, 1); 299 break; 300 default: 301 return (EINVAL); 302 } 303 304 return (0); 305 } 306