1 /* $OpenBSD: gscpcib.c,v 1.8 2023/01/30 10:49:05 jsg 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
29 #include <machine/bus.h>
30
31 #include <dev/pci/pcireg.h>
32 #include <dev/pci/pcivar.h>
33 #include <dev/pci/pcidevs.h>
34
35 #include <dev/gpio/gpiovar.h>
36
37 #include <i386/pci/gscpcibreg.h>
38
39 struct gscpcib_softc {
40 struct device sc_dev;
41
42 /* GPIO interface */
43 bus_space_tag_t sc_gpio_iot;
44 bus_space_handle_t sc_gpio_ioh;
45 struct gpio_chipset_tag sc_gpio_gc;
46 gpio_pin_t sc_gpio_pins[GSCGPIO_NPINS];
47 };
48
49 int gscpcib_match(struct device *, void *, void *);
50 void gscpcib_attach(struct device *, struct device *, void *);
51
52 int gscpcib_gpio_pin_read(void *, int);
53 void gscpcib_gpio_pin_write(void *, int, int);
54 void gscpcib_gpio_pin_ctl(void *, int, int);
55
56 /* arch/i386/pci/pcib.c */
57 void pcibattach(struct device *, struct device *, void *);
58
59 const struct cfattach gscpcib_ca = {
60 sizeof (struct gscpcib_softc),
61 gscpcib_match,
62 gscpcib_attach
63 };
64
65 struct cfdriver gscpcib_cd = {
66 NULL, "gscpcib", DV_DULL
67 };
68
69 int
gscpcib_match(struct device * parent,void * match,void * aux)70 gscpcib_match(struct device *parent, void *match, void *aux)
71 {
72 struct pci_attach_args *pa = aux;
73
74 if (PCI_CLASS(pa->pa_class) != PCI_CLASS_BRIDGE ||
75 PCI_SUBCLASS(pa->pa_class) != PCI_SUBCLASS_BRIDGE_ISA)
76 return (0);
77
78 if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS &&
79 PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_ISA)
80 return (2); /* supersede pcib(4) */
81
82 return (0);
83 }
84
85 void
gscpcib_attach(struct device * parent,struct device * self,void * aux)86 gscpcib_attach(struct device *parent, struct device *self, void *aux)
87 {
88 #ifndef SMALL_KERNEL
89 struct gscpcib_softc *sc = (struct gscpcib_softc *)self;
90 struct pci_attach_args *pa = aux;
91 struct gpiobus_attach_args gba;
92 pcireg_t gpiobase;
93 int i;
94 int gpio_present = 0;
95
96 /* Map GPIO I/O space */
97 gpiobase = pci_conf_read(pa->pa_pc, pa->pa_tag, GSCGPIO_BASE);
98 sc->sc_gpio_iot = pa->pa_iot;
99 if (PCI_MAPREG_IO_ADDR(gpiobase) == 0 ||
100 bus_space_map(sc->sc_gpio_iot, PCI_MAPREG_IO_ADDR(gpiobase),
101 GSCGPIO_SIZE, 0, &sc->sc_gpio_ioh)) {
102 printf(": can't map GPIO i/o space");
103 goto corepcib;
104 }
105
106 /* Initialize pins array */
107 for (i = 0; i < GSCGPIO_NPINS; i++) {
108 sc->sc_gpio_pins[i].pin_num = i;
109 sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT |
110 GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN |
111 GPIO_PIN_PUSHPULL | GPIO_PIN_TRISTATE |
112 GPIO_PIN_PULLUP;
113
114 /* Read initial state */
115 sc->sc_gpio_pins[i].pin_state = gscpcib_gpio_pin_read(sc, i) ?
116 GPIO_PIN_HIGH : GPIO_PIN_LOW;
117 }
118
119 /* Create controller tag */
120 sc->sc_gpio_gc.gp_cookie = sc;
121 sc->sc_gpio_gc.gp_pin_read = gscpcib_gpio_pin_read;
122 sc->sc_gpio_gc.gp_pin_write = gscpcib_gpio_pin_write;
123 sc->sc_gpio_gc.gp_pin_ctl = gscpcib_gpio_pin_ctl;
124
125 gba.gba_name = "gpio";
126 gba.gba_gc = &sc->sc_gpio_gc;
127 gba.gba_pins = sc->sc_gpio_pins;
128 gba.gba_npins = GSCGPIO_NPINS;
129
130 gpio_present = 1;
131
132 corepcib:
133 #endif /* !SMALL_KERNEL */
134 /* Provide core pcib(4) functionality */
135 pcibattach(parent, self, aux);
136
137 #ifndef SMALL_KERNEL
138 /* Attach GPIO framework */
139 if (gpio_present)
140 config_found(&sc->sc_dev, &gba, gpiobus_print);
141 #endif /* !SMALL_KERNEL */
142 }
143
144 #ifndef SMALL_KERNEL
145 static __inline void
gscpcib_gpio_pin_select(struct gscpcib_softc * sc,int pin)146 gscpcib_gpio_pin_select(struct gscpcib_softc *sc, int pin)
147 {
148 bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, GSCGPIO_SEL, pin);
149 }
150
151 int
gscpcib_gpio_pin_read(void * arg,int pin)152 gscpcib_gpio_pin_read(void *arg, int pin)
153 {
154 struct gscpcib_softc *sc = arg;
155 int reg, shift;
156 u_int32_t data;
157
158 reg = (pin < 32 ? GSCGPIO_GPDI0 : GSCGPIO_GPDI1);
159 shift = pin % 32;
160 data = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg);
161
162 return ((data >> shift) & 0x1);
163 }
164
165 void
gscpcib_gpio_pin_write(void * arg,int pin,int value)166 gscpcib_gpio_pin_write(void *arg, int pin, int value)
167 {
168 struct gscpcib_softc *sc = arg;
169 int reg, shift;
170 u_int32_t data;
171
172 reg = (pin < 32 ? GSCGPIO_GPDO0 : GSCGPIO_GPDO1);
173 shift = pin % 32;
174 data = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg);
175 if (value == 0)
176 data &= ~(1 << shift);
177 else if (value == 1)
178 data |= (1 << shift);
179
180 bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh, reg, data);
181 }
182
183 void
gscpcib_gpio_pin_ctl(void * arg,int pin,int flags)184 gscpcib_gpio_pin_ctl(void *arg, int pin, int flags)
185 {
186 struct gscpcib_softc *sc = arg;
187 u_int32_t conf;
188
189 gscpcib_gpio_pin_select(sc, pin);
190 conf = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
191 GSCGPIO_CONF);
192
193 conf &= ~(GSCGPIO_CONF_OUTPUTEN | GSCGPIO_CONF_PUSHPULL |
194 GSCGPIO_CONF_PULLUP);
195 if ((flags & GPIO_PIN_TRISTATE) == 0)
196 conf |= GSCGPIO_CONF_OUTPUTEN;
197 if (flags & GPIO_PIN_PUSHPULL)
198 conf |= GSCGPIO_CONF_PUSHPULL;
199 if (flags & GPIO_PIN_PULLUP)
200 conf |= GSCGPIO_CONF_PULLUP;
201 bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
202 GSCGPIO_CONF, conf);
203 }
204 #endif /* !SMALL_KERNEL */
205