ti_pruss.c revision 281085
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: head/sys/arm/ti/ti_pruss.c 281085 2015-04-04 21:34:26Z andrew $"); 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 63static device_probe_t ti_pruss_probe; 64static device_attach_t ti_pruss_attach; 65static device_detach_t ti_pruss_detach; 66static void ti_pruss_intr(void *); 67static d_open_t ti_pruss_open; 68static d_mmap_t ti_pruss_mmap; 69static void ti_pruss_kq_read_detach(struct knote *); 70static int ti_pruss_kq_read_event(struct knote *, long); 71static d_kqfilter_t ti_pruss_kqfilter; 72 73#define TI_PRUSS_IRQS 8 74struct ti_pruss_softc { 75 struct mtx sc_mtx; 76 struct resource *sc_mem_res; 77 struct resource *sc_irq_res[TI_PRUSS_IRQS]; 78 void *sc_intr[TI_PRUSS_IRQS]; 79 bus_space_tag_t sc_bt; 80 bus_space_handle_t sc_bh; 81 struct cdev *sc_pdev; 82 struct selinfo sc_selinfo; 83}; 84 85static struct cdevsw ti_pruss_cdevsw = { 86 .d_version = D_VERSION, 87 .d_name = "ti_pruss", 88 .d_open = ti_pruss_open, 89 .d_mmap = ti_pruss_mmap, 90 .d_kqfilter = ti_pruss_kqfilter, 91}; 92 93static device_method_t ti_pruss_methods[] = { 94 DEVMETHOD(device_probe, ti_pruss_probe), 95 DEVMETHOD(device_attach, ti_pruss_attach), 96 DEVMETHOD(device_detach, ti_pruss_detach), 97 98 DEVMETHOD_END 99}; 100 101static driver_t ti_pruss_driver = { 102 "ti_pruss", 103 ti_pruss_methods, 104 sizeof(struct ti_pruss_softc) 105}; 106 107static devclass_t ti_pruss_devclass; 108 109DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0); 110 111static struct resource_spec ti_pruss_irq_spec[] = { 112 { SYS_RES_IRQ, 0, RF_ACTIVE }, 113 { SYS_RES_IRQ, 1, RF_ACTIVE }, 114 { SYS_RES_IRQ, 2, RF_ACTIVE }, 115 { SYS_RES_IRQ, 3, RF_ACTIVE }, 116 { SYS_RES_IRQ, 4, RF_ACTIVE }, 117 { SYS_RES_IRQ, 5, RF_ACTIVE }, 118 { SYS_RES_IRQ, 6, RF_ACTIVE }, 119 { SYS_RES_IRQ, 7, RF_ACTIVE }, 120 { -1, 0, 0 } 121}; 122 123static struct ti_pruss_irq_arg { 124 int irq; 125 struct ti_pruss_softc *sc; 126} ti_pruss_irq_args[TI_PRUSS_IRQS]; 127 128static __inline uint32_t 129ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg) 130{ 131 return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg)); 132} 133 134static __inline void 135ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val) 136{ 137 bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val); 138} 139 140static int 141ti_pruss_probe(device_t dev) 142{ 143 144 if (!ofw_bus_status_okay(dev)) 145 return (ENXIO); 146 147 if (ofw_bus_is_compatible(dev, "ti,pruss-v1") || 148 ofw_bus_is_compatible(dev, "ti,pruss-v2")) { 149 device_set_desc(dev, "TI Programmable Realtime Unit Subsystem"); 150 return (BUS_PROBE_DEFAULT); 151 } 152 153 return (ENXIO); 154} 155 156static int 157ti_pruss_attach(device_t dev) 158{ 159 struct ti_pruss_softc *sc; 160 int rid, i; 161 162 if (ti_prcm_clk_enable(PRUSS_CLK) != 0) { 163 device_printf(dev, "could not enable PRUSS clock\n"); 164 return (ENXIO); 165 } 166 sc = device_get_softc(dev); 167 rid = 0; 168 mtx_init(&sc->sc_mtx, "TI PRUSS", NULL, MTX_DEF); 169 sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 170 RF_ACTIVE); 171 if (sc->sc_mem_res == NULL) { 172 device_printf(dev, "could not allocate memory resource\n"); 173 return (ENXIO); 174 } 175 sc->sc_bt = rman_get_bustag(sc->sc_mem_res); 176 sc->sc_bh = rman_get_bushandle(sc->sc_mem_res); 177 if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) { 178 device_printf(dev, "could not allocate interrupt resource\n"); 179 ti_pruss_detach(dev); 180 return (ENXIO); 181 } 182 for (i = 0; i < TI_PRUSS_IRQS; i++) { 183 ti_pruss_irq_args[i].irq = i; 184 ti_pruss_irq_args[i].sc = sc; 185 if (bus_setup_intr(dev, sc->sc_irq_res[i], 186 INTR_MPSAFE | INTR_TYPE_MISC, 187 NULL, ti_pruss_intr, &ti_pruss_irq_args[i], 188 &sc->sc_intr[i]) != 0) { 189 device_printf(dev, 190 "unable to setup the interrupt handler\n"); 191 ti_pruss_detach(dev); 192 return (ENXIO); 193 } 194 } 195 if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV) 196 device_printf(dev, "AM18xx PRU-ICSS\n"); 197 else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV) 198 device_printf(dev, "AM33xx PRU-ICSS\n"); 199 200 sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL, 201 0600, "pruss%d", device_get_unit(dev)); 202 sc->sc_pdev->si_drv1 = dev; 203 204 return (0); 205} 206 207static int 208ti_pruss_detach(device_t dev) 209{ 210 struct ti_pruss_softc *sc; 211 int i; 212 213 sc = device_get_softc(dev); 214 for (i = 0; i < TI_PRUSS_IRQS; i++) { 215 if (sc->sc_intr[i]) 216 bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]); 217 if (sc->sc_irq_res[i]) 218 bus_release_resource(dev, SYS_RES_IRQ, 219 rman_get_rid(sc->sc_irq_res[i]), 220 sc->sc_irq_res[i]); 221 } 222 if (sc->sc_mem_res) 223 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res), 224 sc->sc_mem_res); 225 if (sc->sc_pdev) 226 destroy_dev(sc->sc_pdev); 227 228 return (0); 229} 230 231static void 232ti_pruss_intr(void *arg) 233{ 234 struct ti_pruss_irq_arg *iap; 235 struct ti_pruss_softc *sc; 236 237 iap = arg; 238 sc = iap->sc; 239 DPRINTF("interrupt %p", sc); 240 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq); 241} 242 243static int 244ti_pruss_open(struct cdev *cdev __unused, int oflags __unused, 245 int devtype __unused, struct thread *td __unused) 246{ 247 return (0); 248} 249 250static int 251ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr, 252 int nprot, vm_memattr_t *memattr) 253{ 254 device_t dev = cdev->si_drv1; 255 struct ti_pruss_softc *sc = device_get_softc(dev); 256 257 if (offset > rman_get_size(sc->sc_mem_res)) 258 return (-1); 259 *paddr = rman_get_start(sc->sc_mem_res) + offset; 260 *memattr = VM_MEMATTR_UNCACHEABLE; 261 262 return (0); 263} 264 265static struct filterops ti_pruss_kq_read = { 266 .f_isfd = 1, 267 .f_detach = ti_pruss_kq_read_detach, 268 .f_event = ti_pruss_kq_read_event, 269}; 270 271static void 272ti_pruss_kq_read_detach(struct knote *kn) 273{ 274 struct ti_pruss_softc *sc = kn->kn_hook; 275 276 knlist_remove(&sc->sc_selinfo.si_note, kn, 0); 277} 278 279static int 280ti_pruss_kq_read_event(struct knote *kn, long hint) 281{ 282 kn->kn_data = hint; 283 284 return (hint); 285} 286 287static int 288ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn) 289{ 290 device_t dev = cdev->si_drv1; 291 struct ti_pruss_softc *sc = device_get_softc(dev); 292 293 switch (kn->kn_filter) { 294 case EVFILT_READ: 295 kn->kn_hook = sc; 296 kn->kn_fop = &ti_pruss_kq_read; 297 knlist_add(&sc->sc_selinfo.si_note, kn, 1); 298 break; 299 default: 300 return (EINVAL); 301 } 302 303 return (0); 304} 305