at91_pio.c revision 157089
1/*- 2 * Copyright (c) 2006 M. Warner Losh. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 25#include <sys/cdefs.h> 26__FBSDID("$FreeBSD: head/sys/arm/at91/at91_pio.c 157089 2006-03-24 07:39:29Z imp $"); 27 28#include <sys/param.h> 29#include <sys/systm.h> 30#include <sys/bus.h> 31#include <sys/conf.h> 32#include <sys/kernel.h> 33#include <sys/lock.h> 34#include <sys/mbuf.h> 35#include <sys/malloc.h> 36#include <sys/module.h> 37#include <sys/mutex.h> 38#include <sys/rman.h> 39#include <machine/bus.h> 40 41#include <arm/at91/at91_pioreg.h> 42 43struct at91_pio_softc 44{ 45 device_t dev; /* Myself */ 46 void *intrhand; /* Interrupt handle */ 47 struct resource *irq_res; /* IRQ resource */ 48 struct resource *mem_res; /* Memory resource */ 49 struct mtx sc_mtx; /* basically a perimeter lock */ 50 struct cdev *cdev; 51 int flags; 52#define OPENED 1 53}; 54 55static inline uint32_t 56RD4(struct at91_pio_softc *sc, bus_size_t off) 57{ 58 return bus_read_4(sc->mem_res, off); 59} 60 61static inline void 62WR4(struct at91_pio_softc *sc, bus_size_t off, uint32_t val) 63{ 64 bus_write_4(sc->mem_res, off, val); 65} 66 67#define AT91_PIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx) 68#define AT91_PIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx) 69#define AT91_PIO_LOCK_INIT(_sc) \ 70 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \ 71 "pio", MTX_SPIN) 72#define AT91_PIO_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx); 73#define AT91_PIO_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED); 74#define AT91_PIO_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED); 75#define CDEV2SOFTC(dev) ((dev)->si_drv1) 76 77static devclass_t at91_pio_devclass; 78 79/* bus entry points */ 80 81static int at91_pio_probe(device_t dev); 82static int at91_pio_attach(device_t dev); 83static int at91_pio_detach(device_t dev); 84static void at91_pio_intr(void *); 85 86/* helper routines */ 87static int at91_pio_activate(device_t dev); 88static void at91_pio_deactivate(device_t dev); 89 90/* cdev routines */ 91static d_open_t at91_pio_open; 92static d_close_t at91_pio_close; 93static d_ioctl_t at91_pio_ioctl; 94 95static struct cdevsw at91_pio_cdevsw = 96{ 97 .d_version = D_VERSION, 98 .d_open = at91_pio_open, 99 .d_close = at91_pio_close, 100 .d_ioctl = at91_pio_ioctl 101}; 102 103static int 104at91_pio_probe(device_t dev) 105{ 106 device_set_desc(dev, "PIO"); 107 return (0); 108} 109 110static int 111at91_pio_attach(device_t dev) 112{ 113 struct at91_pio_softc *sc = device_get_softc(dev); 114 int err; 115 116 sc->dev = dev; 117 err = at91_pio_activate(dev); 118 if (err) 119 goto out; 120 121 AT91_PIO_LOCK_INIT(sc); 122 123 /* 124 * Activate the interrupt, but disable all interrupts in the hardware 125 */ 126 WR4(sc, PIO_IDR, 0xffffffff); 127 err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_FAST, 128 at91_pio_intr, sc, &sc->intrhand); 129 if (err) { 130 AT91_PIO_LOCK_DESTROY(sc); 131 goto out; 132 } 133 sc->cdev = make_dev(&at91_pio_cdevsw, device_get_unit(dev), UID_ROOT 134 , GID_WHEEL, 0600, "pio%d", device_get_unit(dev)); 135 if (sc->cdev == NULL) { 136 err = ENOMEM; 137 goto out; 138 } 139 sc->cdev->si_drv1 = sc; 140out:; 141 if (err) 142 at91_pio_deactivate(dev); 143 return (err); 144} 145 146static int 147at91_pio_detach(device_t dev) 148{ 149 return (EBUSY); /* XXX */ 150} 151 152static int 153at91_pio_activate(device_t dev) 154{ 155 struct at91_pio_softc *sc; 156 int rid; 157 158 sc = device_get_softc(dev); 159 rid = 0; 160 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 161 RF_ACTIVE); 162 if (sc->mem_res == NULL) 163 goto errout; 164 rid = 0; 165 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 166 RF_ACTIVE | RF_SHAREABLE); 167 if (sc->irq_res == NULL) 168 goto errout; 169 return (0); 170errout: 171 at91_pio_deactivate(dev); 172 return (ENOMEM); 173} 174 175static void 176at91_pio_deactivate(device_t dev) 177{ 178 struct at91_pio_softc *sc; 179 180 sc = device_get_softc(dev); 181 if (sc->intrhand) 182 bus_teardown_intr(dev, sc->irq_res, sc->intrhand); 183 sc->intrhand = 0; 184 bus_generic_detach(sc->dev); 185 if (sc->mem_res) 186 bus_release_resource(dev, SYS_RES_IOPORT, 187 rman_get_rid(sc->mem_res), sc->mem_res); 188 sc->mem_res = 0; 189 if (sc->irq_res) 190 bus_release_resource(dev, SYS_RES_IRQ, 191 rman_get_rid(sc->irq_res), sc->irq_res); 192 sc->irq_res = 0; 193 return; 194} 195 196static void 197at91_pio_intr(void *xsc) 198{ 199 struct at91_pio_softc *sc = xsc; 200#if 0 201 uint32_t status; 202 203 /* Reading the status also clears the interrupt */ 204 status = RD4(sc, PIO_SR); 205 if (status == 0) 206 return; 207 AT91_PIO_LOCK(sc); 208 AT91_PIO_UNLOCK(sc); 209#endif 210 wakeup(sc); 211 return; 212} 213 214static int 215at91_pio_open(struct cdev *dev, int oflags, int devtype, struct thread *td) 216{ 217 struct at91_pio_softc *sc; 218 219 sc = CDEV2SOFTC(dev); 220 AT91_PIO_LOCK(sc); 221 if (!(sc->flags & OPENED)) { 222 sc->flags |= OPENED; 223#if 0 224 // Enable interrupts 225#endif 226 } 227 AT91_PIO_UNLOCK(sc); 228 return (0); 229} 230 231static int 232at91_pio_close(struct cdev *dev, int fflag, int devtype, struct thread *td) 233{ 234 struct at91_pio_softc *sc; 235 236 sc = CDEV2SOFTC(dev); 237 AT91_PIO_LOCK(sc); 238 sc->flags &= ~OPENED; 239#if 0 240 // Disable interrupts 241#endif 242 AT91_PIO_UNLOCK(sc); 243 return (0); 244} 245 246static int 247at91_pio_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, 248 struct thread *td) 249{ 250 return (ENXIO); 251} 252 253static device_method_t at91_pio_methods[] = { 254 /* Device interface */ 255 DEVMETHOD(device_probe, at91_pio_probe), 256 DEVMETHOD(device_attach, at91_pio_attach), 257 DEVMETHOD(device_detach, at91_pio_detach), 258 259 { 0, 0 } 260}; 261 262static driver_t at91_pio_driver = { 263 "at91_pio", 264 at91_pio_methods, 265 sizeof(struct at91_pio_softc), 266}; 267 268DRIVER_MODULE(at91_pio, atmelarm, at91_pio_driver, at91_pio_devclass, 0, 0); 269