Annotation of sys/arch/i386/pci/gscpcib.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: gscpcib.c,v 1.5 2006/12/11 20:57:40 deraadt Exp $ */
! 2: /*
! 3: * Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
! 4: *
! 5: * Permission to use, copy, modify, and distribute this software for any
! 6: * purpose with or without fee is hereby granted, provided that the above
! 7: * copyright notice and this permission notice appear in all copies.
! 8: *
! 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 16: */
! 17:
! 18: /*
! 19: * Special driver for the National Semiconductor Geode SC1100 PCI-ISA bridge
! 20: * that attaches instead of pcib(4). In addition to the core pcib(4)
! 21: * functionality this driver provides support for the GPIO interface.
! 22: */
! 23:
! 24: #include <sys/param.h>
! 25: #include <sys/systm.h>
! 26: #include <sys/device.h>
! 27: #include <sys/gpio.h>
! 28: #include <sys/kernel.h>
! 29:
! 30: #include <machine/bus.h>
! 31:
! 32: #include <dev/pci/pcireg.h>
! 33: #include <dev/pci/pcivar.h>
! 34: #include <dev/pci/pcidevs.h>
! 35:
! 36: #include <dev/gpio/gpiovar.h>
! 37:
! 38: #include <i386/pci/gscpcibreg.h>
! 39:
! 40: struct gscpcib_softc {
! 41: struct device sc_dev;
! 42:
! 43: /* GPIO interface */
! 44: bus_space_tag_t sc_gpio_iot;
! 45: bus_space_handle_t sc_gpio_ioh;
! 46: struct gpio_chipset_tag sc_gpio_gc;
! 47: gpio_pin_t sc_gpio_pins[GSCGPIO_NPINS];
! 48: };
! 49:
! 50: int gscpcib_match(struct device *, void *, void *);
! 51: void gscpcib_attach(struct device *, struct device *, void *);
! 52:
! 53: int gscpcib_gpio_pin_read(void *, int);
! 54: void gscpcib_gpio_pin_write(void *, int, int);
! 55: void gscpcib_gpio_pin_ctl(void *, int, int);
! 56:
! 57: /* arch/i386/pci/pcib.c */
! 58: void pcibattach(struct device *, struct device *, void *);
! 59:
! 60: struct cfattach gscpcib_ca = {
! 61: sizeof (struct gscpcib_softc),
! 62: gscpcib_match,
! 63: gscpcib_attach
! 64: };
! 65:
! 66: struct cfdriver gscpcib_cd = {
! 67: NULL, "gscpcib", DV_DULL
! 68: };
! 69:
! 70: int
! 71: gscpcib_match(struct device *parent, void *match, void *aux)
! 72: {
! 73: struct pci_attach_args *pa = aux;
! 74:
! 75: if (PCI_CLASS(pa->pa_class) != PCI_CLASS_BRIDGE ||
! 76: PCI_SUBCLASS(pa->pa_class) != PCI_SUBCLASS_BRIDGE_ISA)
! 77: return (0);
! 78:
! 79: if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS &&
! 80: PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_ISA)
! 81: return (2); /* supersede pcib(4) */
! 82:
! 83: return (0);
! 84: }
! 85:
! 86: void
! 87: gscpcib_attach(struct device *parent, struct device *self, void *aux)
! 88: {
! 89: #ifndef SMALL_KERNEL
! 90: struct gscpcib_softc *sc = (struct gscpcib_softc *)self;
! 91: struct pci_attach_args *pa = aux;
! 92: struct gpiobus_attach_args gba;
! 93: pcireg_t gpiobase;
! 94: int i;
! 95: int gpio_present = 0;
! 96:
! 97: /* Map GPIO I/O space */
! 98: gpiobase = pci_conf_read(pa->pa_pc, pa->pa_tag, GSCGPIO_BASE);
! 99: sc->sc_gpio_iot = pa->pa_iot;
! 100: if (PCI_MAPREG_IO_ADDR(gpiobase) == 0 ||
! 101: bus_space_map(sc->sc_gpio_iot, PCI_MAPREG_IO_ADDR(gpiobase),
! 102: GSCGPIO_SIZE, 0, &sc->sc_gpio_ioh)) {
! 103: printf(": failed to map GPIO I/O space");
! 104: goto corepcib;
! 105: }
! 106:
! 107: /* Initialize pins array */
! 108: for (i = 0; i < GSCGPIO_NPINS; i++) {
! 109: sc->sc_gpio_pins[i].pin_num = i;
! 110: sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT |
! 111: GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN |
! 112: GPIO_PIN_PUSHPULL | GPIO_PIN_TRISTATE |
! 113: GPIO_PIN_PULLUP;
! 114:
! 115: /* Read initial state */
! 116: sc->sc_gpio_pins[i].pin_state = gscpcib_gpio_pin_read(sc, i) ?
! 117: GPIO_PIN_HIGH : GPIO_PIN_LOW;
! 118: }
! 119:
! 120: /* Create controller tag */
! 121: sc->sc_gpio_gc.gp_cookie = sc;
! 122: sc->sc_gpio_gc.gp_pin_read = gscpcib_gpio_pin_read;
! 123: sc->sc_gpio_gc.gp_pin_write = gscpcib_gpio_pin_write;
! 124: sc->sc_gpio_gc.gp_pin_ctl = gscpcib_gpio_pin_ctl;
! 125:
! 126: gba.gba_name = "gpio";
! 127: gba.gba_gc = &sc->sc_gpio_gc;
! 128: gba.gba_pins = sc->sc_gpio_pins;
! 129: gba.gba_npins = GSCGPIO_NPINS;
! 130:
! 131: gpio_present = 1;
! 132:
! 133: corepcib:
! 134: #endif /* !SMALL_KERNEL */
! 135: /* Provide core pcib(4) functionality */
! 136: pcibattach(parent, self, aux);
! 137:
! 138: #ifndef SMALL_KERNEL
! 139: /* Attach GPIO framework */
! 140: if (gpio_present)
! 141: config_found(&sc->sc_dev, &gba, gpiobus_print);
! 142: #endif /* !SMALL_KERNEL */
! 143: }
! 144:
! 145: #ifndef SMALL_KERNEL
! 146: static __inline void
! 147: gscpcib_gpio_pin_select(struct gscpcib_softc *sc, int pin)
! 148: {
! 149: bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, GSCGPIO_SEL, pin);
! 150: }
! 151:
! 152: int
! 153: gscpcib_gpio_pin_read(void *arg, int pin)
! 154: {
! 155: struct gscpcib_softc *sc = arg;
! 156: int reg, shift;
! 157: u_int32_t data;
! 158:
! 159: reg = (pin < 32 ? GSCGPIO_GPDI0 : GSCGPIO_GPDI1);
! 160: shift = pin % 32;
! 161: data = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg);
! 162:
! 163: return ((data >> shift) & 0x1);
! 164: }
! 165:
! 166: void
! 167: gscpcib_gpio_pin_write(void *arg, int pin, int value)
! 168: {
! 169: struct gscpcib_softc *sc = arg;
! 170: int reg, shift;
! 171: u_int32_t data;
! 172:
! 173: reg = (pin < 32 ? GSCGPIO_GPDO0 : GSCGPIO_GPDO1);
! 174: shift = pin % 32;
! 175: data = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg);
! 176: if (value == 0)
! 177: data &= ~(1 << shift);
! 178: else if (value == 1)
! 179: data |= (1 << shift);
! 180:
! 181: bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg, data);
! 182: }
! 183:
! 184: void
! 185: gscpcib_gpio_pin_ctl(void *arg, int pin, int flags)
! 186: {
! 187: struct gscpcib_softc *sc = arg;
! 188: u_int32_t conf;
! 189:
! 190: gscpcib_gpio_pin_select(sc, pin);
! 191: conf = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
! 192: GSCGPIO_CONF);
! 193:
! 194: conf &= ~(GSCGPIO_CONF_OUTPUTEN | GSCGPIO_CONF_PUSHPULL |
! 195: GSCGPIO_CONF_PULLUP);
! 196: if ((flags & GPIO_PIN_TRISTATE) == 0)
! 197: conf |= GSCGPIO_CONF_OUTPUTEN;
! 198: if (flags & GPIO_PIN_PUSHPULL)
! 199: conf |= GSCGPIO_CONF_PUSHPULL;
! 200: if (flags & GPIO_PIN_PULLUP)
! 201: conf |= GSCGPIO_CONF_PULLUP;
! 202: bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
! 203: GSCGPIO_CONF, conf);
! 204: }
! 205: #endif /* !SMALL_KERNEL */
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to gscpcib.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / i386 / pci