vf_port.c revision 266274
1/*- 2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 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 AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27/* 28 * Vybrid Family Port control and interrupts (PORT) 29 * Chapter 6, Vybrid Reference Manual, Rev. 5, 07/2013 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: stable/10/sys/arm/freescale/vybrid/vf_port.c 266274 2014-05-16 23:27:18Z ian $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/bus.h> 38#include <sys/kernel.h> 39#include <sys/module.h> 40#include <sys/malloc.h> 41#include <sys/rman.h> 42#include <sys/timeet.h> 43#include <sys/timetc.h> 44#include <sys/watchdog.h> 45 46#include <dev/fdt/fdt_common.h> 47#include <dev/ofw/openfirm.h> 48#include <dev/ofw/ofw_bus.h> 49#include <dev/ofw/ofw_bus_subr.h> 50 51#include <machine/bus.h> 52#include <machine/fdt.h> 53#include <machine/cpu.h> 54#include <machine/intr.h> 55 56#include <arm/freescale/vybrid/vf_port.h> 57#include <arm/freescale/vybrid/vf_common.h> 58 59/* Pin Control Register */ 60#define PORT_PCR(n) (0x1000 * (n >> 5) + 0x4 * (n % 32)) 61#define PCR_IRQC_S 16 62#define PCR_IRQC_M 0xF 63#define PCR_DMA_RE 0x1 64#define PCR_DMA_FE 0x2 65#define PCR_DMA_EE 0x3 66#define PCR_INT_LZ 0x8 67#define PCR_INT_RE 0x9 68#define PCR_INT_FE 0xA 69#define PCR_INT_EE 0xB 70#define PCR_INT_LO 0xC 71#define PCR_ISF (1 << 24) 72#define PORT0_ISFR 0xA0 /* Interrupt Status Flag Register */ 73#define PORT0_DFER 0xC0 /* Digital Filter Enable Register */ 74#define PORT0_DFCR 0xC4 /* Digital Filter Clock Register */ 75#define PORT0_DFWR 0xC8 /* Digital Filter Width Register */ 76 77struct port_event { 78 uint32_t enabled; 79 uint32_t mux_num; 80 uint32_t mux_src; 81 uint32_t mux_chn; 82 void (*ih) (void *); 83 void *ih_user; 84 enum ev_type pevt; 85}; 86 87static struct port_event event_map[NGPIO]; 88 89struct port_softc { 90 struct resource *res[6]; 91 bus_space_tag_t bst; 92 bus_space_handle_t bsh; 93 void *gpio_ih[NGPIO]; 94}; 95 96struct port_softc *port_sc; 97 98static struct resource_spec port_spec[] = { 99 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 100 { SYS_RES_IRQ, 0, RF_ACTIVE }, 101 { SYS_RES_IRQ, 1, RF_ACTIVE }, 102 { SYS_RES_IRQ, 2, RF_ACTIVE }, 103 { SYS_RES_IRQ, 3, RF_ACTIVE }, 104 { SYS_RES_IRQ, 4, RF_ACTIVE }, 105 { -1, 0 } 106}; 107 108static int 109port_intr(void *arg) 110{ 111 struct port_event *pev; 112 struct port_softc *sc; 113 int reg; 114 int i; 115 116 sc = arg; 117 118 for (i = 0; i < NGPIO; i++) { 119 reg = READ4(sc, PORT_PCR(i)); 120 if (reg & PCR_ISF) { 121 122 /* Clear interrupt */ 123 WRITE4(sc, PORT_PCR(i), reg); 124 125 /* Handle event */ 126 pev = &event_map[i]; 127 if (pev->enabled == 1) { 128 if (pev->ih != NULL) { 129 pev->ih(pev->ih_user); 130 } 131 } 132 } 133 } 134 135 return (FILTER_HANDLED); 136} 137 138int 139port_setup(int pnum, enum ev_type pevt, void (*ih)(void *), void *ih_user) 140{ 141 struct port_event *pev; 142 struct port_softc *sc; 143 int reg; 144 int val; 145 146 sc = port_sc; 147 148 switch (pevt) { 149 case DMA_RISING_EDGE: 150 val = PCR_DMA_RE; 151 break; 152 case DMA_FALLING_EDGE: 153 val = PCR_DMA_FE; 154 break; 155 case DMA_EITHER_EDGE: 156 val = PCR_DMA_EE; 157 break; 158 case INT_LOGIC_ZERO: 159 val = PCR_INT_LZ; 160 break; 161 case INT_RISING_EDGE: 162 val = PCR_INT_RE; 163 break; 164 case INT_FALLING_EDGE: 165 val = PCR_INT_FE; 166 break; 167 case INT_EITHER_EDGE: 168 val = PCR_INT_RE; 169 break; 170 case INT_LOGIC_ONE: 171 val = PCR_INT_LO; 172 break; 173 default: 174 return (-1); 175 }; 176 177 reg = READ4(sc, PORT_PCR(pnum)); 178 reg &= ~(PCR_IRQC_M << PCR_IRQC_S); 179 reg |= (val << PCR_IRQC_S); 180 WRITE4(sc, PORT_PCR(pnum), reg); 181 182 pev = &event_map[pnum]; 183 pev->ih = ih; 184 pev->ih_user = ih_user; 185 pev->pevt = pevt; 186 pev->enabled = 1; 187 188 return (0); 189} 190 191static int 192port_probe(device_t dev) 193{ 194 195 if (!ofw_bus_status_okay(dev)) 196 return (ENXIO); 197 198 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-port")) 199 return (ENXIO); 200 201 device_set_desc(dev, "Vybrid Family Port control and interrupts"); 202 return (BUS_PROBE_DEFAULT); 203} 204 205static int 206port_attach(device_t dev) 207{ 208 struct port_softc *sc; 209 int irq; 210 211 sc = device_get_softc(dev); 212 213 if (bus_alloc_resources(dev, port_spec, sc->res)) { 214 device_printf(dev, "could not allocate resources\n"); 215 return (ENXIO); 216 } 217 218 /* Memory interface */ 219 sc->bst = rman_get_bustag(sc->res[0]); 220 sc->bsh = rman_get_bushandle(sc->res[0]); 221 222 port_sc = sc; 223 224 for (irq = 0; irq < NPORTS; irq ++) { 225 if ((bus_setup_intr(dev, sc->res[1 + irq], INTR_TYPE_MISC, 226 port_intr, NULL, sc, &sc->gpio_ih[irq]))) { 227 device_printf(dev, 228 "ERROR: Unable to register interrupt handler\n"); 229 return (ENXIO); 230 } 231 } 232 233 return (0); 234} 235 236static device_method_t port_methods[] = { 237 DEVMETHOD(device_probe, port_probe), 238 DEVMETHOD(device_attach, port_attach), 239 { 0, 0 } 240}; 241 242static driver_t port_driver = { 243 "port", 244 port_methods, 245 sizeof(struct port_softc), 246}; 247 248static devclass_t port_devclass; 249 250DRIVER_MODULE(port, simplebus, port_driver, port_devclass, 0, 0); 251