diff options
Diffstat (limited to 'freebsd/sys/dev/gpio/gpiobus.c')
| -rw-r--r-- | freebsd/sys/dev/gpio/gpiobus.c | 185 |
1 files changed, 160 insertions, 25 deletions
diff --git a/freebsd/sys/dev/gpio/gpiobus.c b/freebsd/sys/dev/gpio/gpiobus.c index 2b1899e6..d256ee4a 100644 --- a/freebsd/sys/dev/gpio/gpiobus.c +++ b/freebsd/sys/dev/gpio/gpiobus.c @@ -257,13 +257,6 @@ gpiobus_alloc_ivars(struct gpiobus_ivar *devi) M_NOWAIT | M_ZERO); if (devi->pins == NULL) return (ENOMEM); - devi->flags = malloc(sizeof(uint32_t) * devi->npins, M_DEVBUF, - M_NOWAIT | M_ZERO); - if (devi->flags == NULL) { - free(devi->pins, M_DEVBUF); - return (ENOMEM); - } - return (0); } @@ -271,14 +264,11 @@ void gpiobus_free_ivars(struct gpiobus_ivar *devi) { - if (devi->flags) { - free(devi->flags, M_DEVBUF); - devi->flags = NULL; - } if (devi->pins) { free(devi->pins, M_DEVBUF); devi->pins = NULL; } + devi->npins = 0; } int @@ -328,6 +318,34 @@ gpiobus_release_pin(device_t bus, uint32_t pin) } static int +gpiobus_acquire_child_pins(device_t dev, device_t child) +{ + struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); + int i; + + for (i = 0; i < devi->npins; i++) { + /* Reserve the GPIO pin. */ + if (gpiobus_acquire_pin(dev, devi->pins[i]) != 0) { + device_printf(child, "cannot acquire pin %d\n", + devi->pins[i]); + while (--i >= 0) { + (void)gpiobus_release_pin(dev, + devi->pins[i]); + } + gpiobus_free_ivars(devi); + return (EBUSY); + } + } + for (i = 0; i < devi->npins; i++) { + /* Use the child name as pin name. */ + GPIOBUS_PIN_SETNAME(dev, devi->pins[i], + device_get_nameunit(child)); + + } + return (0); +} + +static int gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask) { struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); @@ -351,17 +369,66 @@ gpiobus_parse_pins(struct gpiobus_softc *sc, device_t child, int mask) for (i = 0; i < 32; i++) { if ((mask & (1 << i)) == 0) continue; - /* Reserve the GPIO pin. */ - if (gpiobus_acquire_pin(sc->sc_busdev, i) != 0) { - gpiobus_free_ivars(devi); - return (EINVAL); - } devi->pins[npins++] = i; - /* Use the child name as pin name. */ - GPIOBUS_PIN_SETNAME(sc->sc_busdev, i, - device_get_nameunit(child)); } + if (gpiobus_acquire_child_pins(sc->sc_busdev, child) != 0) + return (EINVAL); + return (0); +} + +static int +gpiobus_parse_pin_list(struct gpiobus_softc *sc, device_t child, + const char *pins) +{ + struct gpiobus_ivar *devi = GPIOBUS_IVAR(child); + const char *p; + char *endp; + unsigned long pin; + int i, npins; + + npins = 0; + p = pins; + for (;;) { + pin = strtoul(p, &endp, 0); + if (endp == p) + break; + npins++; + if (*endp == '\0') + break; + p = endp + 1; + } + + if (*endp != '\0') { + device_printf(child, "garbage in the pin list: %s\n", endp); + return (EINVAL); + } + if (npins == 0) { + device_printf(child, "empty pin list\n"); + return (EINVAL); + } + + devi->npins = npins; + if (gpiobus_alloc_ivars(devi) != 0) { + device_printf(child, "cannot allocate device ivars\n"); + return (EINVAL); + } + + i = 0; + p = pins; + for (;;) { + pin = strtoul(p, &endp, 0); + + devi->pins[i] = pin; + + if (*endp == '\0') + break; + i++; + p = endp + 1; + } + + if (gpiobus_acquire_child_pins(sc->sc_busdev, child) != 0) + return (EINVAL); return (0); } @@ -541,15 +608,26 @@ gpiobus_hinted_child(device_t bus, const char *dname, int dunit) struct gpiobus_softc *sc = GPIOBUS_SOFTC(bus); struct gpiobus_ivar *devi; device_t child; - int irq, pins; + const char *pins; + int irq, pinmask; child = BUS_ADD_CHILD(bus, 0, dname, dunit); devi = GPIOBUS_IVAR(child); - resource_int_value(dname, dunit, "pins", &pins); - if (gpiobus_parse_pins(sc, child, pins)) { - resource_list_free(&devi->rl); - free(devi, M_DEVBUF); - device_delete_child(bus, child); + if (resource_int_value(dname, dunit, "pins", &pinmask) == 0) { + if (gpiobus_parse_pins(sc, child, pinmask)) { + resource_list_free(&devi->rl); + free(devi, M_DEVBUF); + device_delete_child(bus, child); + return; + } + } + else if (resource_string_value(dname, dunit, "pin_list", &pins) == 0) { + if (gpiobus_parse_pin_list(sc, child, pins)) { + resource_list_free(&devi->rl); + free(devi, M_DEVBUF); + device_delete_child(bus, child); + return; + } } if (resource_int_value(dname, dunit, "irq", &irq) == 0) { if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0) @@ -576,6 +654,61 @@ gpiobus_set_resource(device_t dev, device_t child, int type, int rid, return (0); } +static int +gpiobus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) +{ + struct gpiobus_ivar *devi; + + devi = GPIOBUS_IVAR(child); + switch (which) { + case GPIOBUS_IVAR_NPINS: + *result = devi->npins; + break; + case GPIOBUS_IVAR_PINS: + /* Children do not ever need to directly examine this. */ + return (ENOTSUP); + default: + return (ENOENT); + } + + return (0); +} + +static int +gpiobus_write_ivar(device_t dev, device_t child, int which, uintptr_t value) +{ + struct gpiobus_ivar *devi; + const uint32_t *ptr; + int i; + + devi = GPIOBUS_IVAR(child); + switch (which) { + case GPIOBUS_IVAR_NPINS: + /* GPIO ivars are set once. */ + if (devi->npins != 0) { + return (EBUSY); + } + devi->npins = value; + if (gpiobus_alloc_ivars(devi) != 0) { + device_printf(child, "cannot allocate device ivars\n"); + devi->npins = 0; + return (ENOMEM); + } + break; + case GPIOBUS_IVAR_PINS: + ptr = (const uint32_t *)value; + for (i = 0; i < devi->npins; i++) + devi->pins[i] = ptr[i]; + if (gpiobus_acquire_child_pins(dev, child) != 0) + return (EBUSY); + break; + default: + return (ENOENT); + } + + return (0); +} + static struct resource * gpiobus_alloc_resource(device_t bus, device_t child, int type, int *rid, rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) @@ -835,6 +968,8 @@ static device_method_t gpiobus_methods[] = { DEVMETHOD(bus_child_pnpinfo_str, gpiobus_child_pnpinfo_str), DEVMETHOD(bus_child_location_str, gpiobus_child_location_str), DEVMETHOD(bus_hinted_child, gpiobus_hinted_child), + DEVMETHOD(bus_read_ivar, gpiobus_read_ivar), + DEVMETHOD(bus_write_ivar, gpiobus_write_ivar), /* GPIO protocol */ DEVMETHOD(gpiobus_acquire_bus, gpiobus_acquire_bus), |