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 51 #include <arm/ti/ti_prcm.h> 52 #include <arm/ti/ti_pruss.h> 53 54 #ifdef DEBUG 55 #define DPRINTF(fmt, ...) do { \ 56 printf("%s: ", __func__); \ 57 printf(fmt, __VA_ARGS__); \ 58 } while (0) 59 #else 60 #define DPRINTF(fmt, ...) 61 #endif 62 63 static device_probe_t ti_pruss_probe; 64 static device_attach_t ti_pruss_attach; 65 static device_detach_t ti_pruss_detach; 66 static void ti_pruss_intr(void *); 67 static d_open_t ti_pruss_open; 68 static d_mmap_t ti_pruss_mmap; 69 static void ti_pruss_kq_read_detach(struct knote *); 70 static int ti_pruss_kq_read_event(struct knote *, long); 71 static d_kqfilter_t ti_pruss_kqfilter; 72 73 #define TI_PRUSS_IRQS 8 74 75 struct ti_pruss_softc { 76 struct mtx sc_mtx; 77 struct resource *sc_mem_res; 78 struct resource *sc_irq_res[TI_PRUSS_IRQS]; 79 void *sc_intr[TI_PRUSS_IRQS]; 80 bus_space_tag_t sc_bt; 81 bus_space_handle_t sc_bh; 82 struct cdev *sc_pdev; 83 struct selinfo sc_selinfo; 84 }; 85 86 static struct cdevsw ti_pruss_cdevsw = { 87 .d_version = D_VERSION, 88 .d_name = "ti_pruss", 89 .d_open = ti_pruss_open, 90 .d_mmap = ti_pruss_mmap, 91 .d_kqfilter = ti_pruss_kqfilter, 92 }; 93 94 static device_method_t ti_pruss_methods[] = { 95 DEVMETHOD(device_probe, ti_pruss_probe), 96 DEVMETHOD(device_attach, ti_pruss_attach), 97 DEVMETHOD(device_detach, ti_pruss_detach), 98 99 DEVMETHOD_END 100 }; 101 102 static driver_t ti_pruss_driver = { 103 "ti_pruss", 104 ti_pruss_methods, 105 sizeof(struct ti_pruss_softc) 106 }; 107 108 static devclass_t ti_pruss_devclass; 109 110 DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0); 111 112 static struct resource_spec ti_pruss_irq_spec[] = { 113 { SYS_RES_IRQ, 0, RF_ACTIVE }, 114 { SYS_RES_IRQ, 1, RF_ACTIVE }, 115 { SYS_RES_IRQ, 2, RF_ACTIVE }, 116 { SYS_RES_IRQ, 3, RF_ACTIVE }, 117 { SYS_RES_IRQ, 4, RF_ACTIVE }, 118 { SYS_RES_IRQ, 5, RF_ACTIVE }, 119 { SYS_RES_IRQ, 6, RF_ACTIVE }, 120 { SYS_RES_IRQ, 7, RF_ACTIVE }, 121 { -1, 0, 0 } 122 }; 123 CTASSERT(TI_PRUSS_IRQS == nitems(ti_pruss_irq_spec) - 1); 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 knlist_init_mtx(&sc->sc_selinfo.si_note, &sc->sc_mtx); 172 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 173 RF_ACTIVE); 174 if (sc->sc_mem_res == NULL) { 175 device_printf(dev, "could not allocate memory resource\n"); 176 return (ENXIO); 177 } 178 sc->sc_bt = rman_get_bustag(sc->sc_mem_res); 179 sc->sc_bh = rman_get_bushandle(sc->sc_mem_res); 180 if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) { 181 device_printf(dev, "could not allocate interrupt resource\n"); 182 ti_pruss_detach(dev); 183 return (ENXIO); 184 } 185 for (i = 0; i < TI_PRUSS_IRQS; i++) { 186 ti_pruss_irq_args[i].irq = i; 187 ti_pruss_irq_args[i].sc = sc; 188 if (bus_setup_intr(dev, sc->sc_irq_res[i], 189 INTR_MPSAFE | INTR_TYPE_MISC, 190 NULL, ti_pruss_intr, &ti_pruss_irq_args[i], 191 &sc->sc_intr[i]) != 0) { 192 device_printf(dev, 193 "unable to setup the interrupt handler\n"); 194 ti_pruss_detach(dev); 195 return (ENXIO); 196 } 197 } 198 if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV) 199 device_printf(dev, "AM18xx PRU-ICSS\n"); 200 else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV) 201 device_printf(dev, "AM33xx PRU-ICSS\n"); 202 203 sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL, 204 0600, "pruss%d", device_get_unit(dev)); 205 sc->sc_pdev->si_drv1 = dev; 206 207 return (0); 208 } 209 210 static int 211 ti_pruss_detach(device_t dev) 212 { 213 struct ti_pruss_softc *sc; 214 int i; 215 216 sc = device_get_softc(dev); 217 for (i = 0; i < TI_PRUSS_IRQS; i++) { 218 if (sc->sc_intr[i]) 219 bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]); 220 if (sc->sc_irq_res[i]) 221 bus_release_resource(dev, SYS_RES_IRQ, 222 rman_get_rid(sc->sc_irq_res[i]), 223 sc->sc_irq_res[i]); 224 } 225 knlist_clear(&sc->sc_selinfo.si_note, 0); 226 knlist_destroy(&sc->sc_selinfo.si_note); 227 mtx_destroy(&sc->sc_mtx); 228 if (sc->sc_mem_res) 229 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res), 230 sc->sc_mem_res); 231 if (sc->sc_pdev) 232 destroy_dev(sc->sc_pdev); 233 234 return (0); 235 } 236 237 static void 238 ti_pruss_intr(void *arg) 239 { 240 int val; 241 struct ti_pruss_irq_arg *iap = arg; 242 struct ti_pruss_softc *sc = iap->sc; 243 /* 244 * Interrupts pr1_host_intr[0:7] are mapped to 245 * Host-2 to Host-9 of PRU-ICSS IRQ-controller. 246 */ 247 const int pru_int = iap->irq + 2; 248 const int pru_int_mask = (1 << pru_int); 249 250 val = ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC + PRUSS_INTC_HIER); 251 DPRINTF("interrupt %p, %d", sc, pru_int); 252 if (!(val & pru_int_mask)) 253 return; 254 ti_pruss_reg_write(sc, PRUSS_AM33XX_INTC + PRUSS_INTC_HIDISR, 255 pru_int); 256 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, pru_int); 257 } 258 259 static int 260 ti_pruss_open(struct cdev *cdev __unused, int oflags __unused, 261 int devtype __unused, struct thread *td __unused) 262 { 263 return (0); 264 } 265 266 static int 267 ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr, 268 int nprot, vm_memattr_t *memattr) 269 { 270 device_t dev = cdev->si_drv1; 271 struct ti_pruss_softc *sc = device_get_softc(dev); 272 273 if (offset > rman_get_size(sc->sc_mem_res)) 274 return (-1); 275 *paddr = rman_get_start(sc->sc_mem_res) + offset; 276 *memattr = VM_MEMATTR_UNCACHEABLE; 277 278 return (0); 279 } 280 281 static struct filterops ti_pruss_kq_read = { 282 .f_isfd = 1, 283 .f_detach = ti_pruss_kq_read_detach, 284 .f_event = ti_pruss_kq_read_event, 285 }; 286 287 static void 288 ti_pruss_kq_read_detach(struct knote *kn) 289 { 290 struct ti_pruss_softc *sc = kn->kn_hook; 291 292 knlist_remove(&sc->sc_selinfo.si_note, kn, 0); 293 } 294 295 static int 296 ti_pruss_kq_read_event(struct knote *kn, long hint) 297 { 298 kn->kn_data = hint; 299 300 return (hint); 301 } 302 303 static int 304 ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn) 305 { 306 device_t dev = cdev->si_drv1; 307 struct ti_pruss_softc *sc = device_get_softc(dev); 308 309 switch (kn->kn_filter) { 310 case EVFILT_READ: 311 kn->kn_hook = sc; 312 kn->kn_fop = &ti_pruss_kq_read; 313 knlist_add(&sc->sc_selinfo.si_note, kn, 1); 314 break; 315 default: 316 return (EINVAL); 317 } 318 319 return (0); 320 } 321