/*-
* Copyright (c) 2014 Ruslan Bukin
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Vybrid Family Port control and interrupts (PORT)
* Chapter 6, Vybrid Reference Manual, Rev. 5, 07/2013
*/
#include
__FBSDID("$FreeBSD$");
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
/* Pin Control Register */
#define PORT_PCR(n) (0x1000 * (n >> 5) + 0x4 * (n % 32))
#define PCR_IRQC_S 16
#define PCR_IRQC_M 0xF
#define PCR_DMA_RE 0x1
#define PCR_DMA_FE 0x2
#define PCR_DMA_EE 0x3
#define PCR_INT_LZ 0x8
#define PCR_INT_RE 0x9
#define PCR_INT_FE 0xA
#define PCR_INT_EE 0xB
#define PCR_INT_LO 0xC
#define PCR_ISF (1 << 24)
#define PORT0_ISFR 0xA0 /* Interrupt Status Flag Register */
#define PORT0_DFER 0xC0 /* Digital Filter Enable Register */
#define PORT0_DFCR 0xC4 /* Digital Filter Clock Register */
#define PORT0_DFWR 0xC8 /* Digital Filter Width Register */
struct port_event {
uint32_t enabled;
uint32_t mux_num;
uint32_t mux_src;
uint32_t mux_chn;
void (*ih) (void *);
void *ih_user;
enum ev_type pevt;
};
static struct port_event event_map[NGPIO];
struct port_softc {
struct resource *res[6];
bus_space_tag_t bst;
bus_space_handle_t bsh;
void *gpio_ih[NGPIO];
};
struct port_softc *port_sc;
static struct resource_spec port_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 1, RF_ACTIVE },
{ SYS_RES_IRQ, 2, RF_ACTIVE },
{ SYS_RES_IRQ, 3, RF_ACTIVE },
{ SYS_RES_IRQ, 4, RF_ACTIVE },
{ -1, 0 }
};
static int
port_intr(void *arg)
{
struct port_event *pev;
struct port_softc *sc;
int reg;
int i;
sc = arg;
for (i = 0; i < NGPIO; i++) {
reg = READ4(sc, PORT_PCR(i));
if (reg & PCR_ISF) {
/* Clear interrupt */
WRITE4(sc, PORT_PCR(i), reg);
/* Handle event */
pev = &event_map[i];
if (pev->enabled == 1) {
if (pev->ih != NULL) {
pev->ih(pev->ih_user);
}
}
}
}
return (FILTER_HANDLED);
}
int
port_setup(int pnum, enum ev_type pevt, void (*ih)(void *), void *ih_user)
{
struct port_event *pev;
struct port_softc *sc;
int reg;
int val;
sc = port_sc;
switch (pevt) {
case DMA_RISING_EDGE:
val = PCR_DMA_RE;
break;
case DMA_FALLING_EDGE:
val = PCR_DMA_FE;
break;
case DMA_EITHER_EDGE:
val = PCR_DMA_EE;
break;
case INT_LOGIC_ZERO:
val = PCR_INT_LZ;
break;
case INT_RISING_EDGE:
val = PCR_INT_RE;
break;
case INT_FALLING_EDGE:
val = PCR_INT_FE;
break;
case INT_EITHER_EDGE:
val = PCR_INT_EE;
break;
case INT_LOGIC_ONE:
val = PCR_INT_LO;
break;
default:
return (-1);
}
reg = READ4(sc, PORT_PCR(pnum));
reg &= ~(PCR_IRQC_M << PCR_IRQC_S);
reg |= (val << PCR_IRQC_S);
WRITE4(sc, PORT_PCR(pnum), reg);
pev = &event_map[pnum];
pev->ih = ih;
pev->ih_user = ih_user;
pev->pevt = pevt;
pev->enabled = 1;
return (0);
}
static int
port_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "fsl,mvf600-port"))
return (ENXIO);
device_set_desc(dev, "Vybrid Family Port control and interrupts");
return (BUS_PROBE_DEFAULT);
}
static int
port_attach(device_t dev)
{
struct port_softc *sc;
int irq;
sc = device_get_softc(dev);
if (bus_alloc_resources(dev, port_spec, sc->res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
/* Memory interface */
sc->bst = rman_get_bustag(sc->res[0]);
sc->bsh = rman_get_bushandle(sc->res[0]);
port_sc = sc;
for (irq = 0; irq < NPORTS; irq ++) {
if ((bus_setup_intr(dev, sc->res[1 + irq], INTR_TYPE_MISC,
port_intr, NULL, sc, &sc->gpio_ih[irq]))) {
device_printf(dev,
"ERROR: Unable to register interrupt handler\n");
return (ENXIO);
}
}
return (0);
}
static device_method_t port_methods[] = {
DEVMETHOD(device_probe, port_probe),
DEVMETHOD(device_attach, port_attach),
{ 0, 0 }
};
static driver_t port_driver = {
"port",
port_methods,
sizeof(struct port_softc),
};
static devclass_t port_devclass;
DRIVER_MODULE(port, simplebus, port_driver, port_devclass, 0, 0);