1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Vybrid Family Port control and interrupts (PORT)
31 * Chapter 6, Vybrid Reference Manual, Rev. 5, 07/2013
32 */
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/bus.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/malloc.h>
40 #include <sys/rman.h>
41 #include <sys/timeet.h>
42 #include <sys/timetc.h>
43 #include <sys/watchdog.h>
44
45 #include <dev/ofw/openfirm.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
48
49 #include <machine/bus.h>
50 #include <machine/cpu.h>
51 #include <machine/intr.h>
52
53 #include <arm/freescale/vybrid/vf_port.h>
54 #include <arm/freescale/vybrid/vf_common.h>
55
56 /* Pin Control Register */
57 #define PORT_PCR(n) (0x1000 * (n >> 5) + 0x4 * (n % 32))
58 #define PCR_IRQC_S 16
59 #define PCR_IRQC_M 0xF
60 #define PCR_DMA_RE 0x1
61 #define PCR_DMA_FE 0x2
62 #define PCR_DMA_EE 0x3
63 #define PCR_INT_LZ 0x8
64 #define PCR_INT_RE 0x9
65 #define PCR_INT_FE 0xA
66 #define PCR_INT_EE 0xB
67 #define PCR_INT_LO 0xC
68 #define PCR_ISF (1 << 24)
69 #define PORT0_ISFR 0xA0 /* Interrupt Status Flag Register */
70 #define PORT0_DFER 0xC0 /* Digital Filter Enable Register */
71 #define PORT0_DFCR 0xC4 /* Digital Filter Clock Register */
72 #define PORT0_DFWR 0xC8 /* Digital Filter Width Register */
73
74 struct port_event {
75 uint32_t enabled;
76 uint32_t mux_num;
77 uint32_t mux_src;
78 uint32_t mux_chn;
79 void (*ih) (void *);
80 void *ih_user;
81 enum ev_type pevt;
82 };
83
84 static struct port_event event_map[NGPIO];
85
86 struct port_softc {
87 struct resource *res[6];
88 bus_space_tag_t bst;
89 bus_space_handle_t bsh;
90 void *gpio_ih[NGPIO];
91 };
92
93 struct port_softc *port_sc;
94
95 static struct resource_spec port_spec[] = {
96 { SYS_RES_MEMORY, 0, RF_ACTIVE },
97 { SYS_RES_IRQ, 0, RF_ACTIVE },
98 { SYS_RES_IRQ, 1, RF_ACTIVE },
99 { SYS_RES_IRQ, 2, RF_ACTIVE },
100 { SYS_RES_IRQ, 3, RF_ACTIVE },
101 { SYS_RES_IRQ, 4, RF_ACTIVE },
102 { -1, 0 }
103 };
104
105 static int
port_intr(void * arg)106 port_intr(void *arg)
107 {
108 struct port_event *pev;
109 struct port_softc *sc;
110 int reg;
111 int i;
112
113 sc = arg;
114
115 for (i = 0; i < NGPIO; i++) {
116 reg = READ4(sc, PORT_PCR(i));
117 if (reg & PCR_ISF) {
118 /* Clear interrupt */
119 WRITE4(sc, PORT_PCR(i), reg);
120
121 /* Handle event */
122 pev = &event_map[i];
123 if (pev->enabled == 1) {
124 if (pev->ih != NULL) {
125 pev->ih(pev->ih_user);
126 }
127 }
128 }
129 }
130
131 return (FILTER_HANDLED);
132 }
133
134 int
port_setup(int pnum,enum ev_type pevt,void (* ih)(void *),void * ih_user)135 port_setup(int pnum, enum ev_type pevt, void (*ih)(void *), void *ih_user)
136 {
137 struct port_event *pev;
138 struct port_softc *sc;
139 int reg;
140 int val;
141
142 sc = port_sc;
143
144 switch (pevt) {
145 case DMA_RISING_EDGE:
146 val = PCR_DMA_RE;
147 break;
148 case DMA_FALLING_EDGE:
149 val = PCR_DMA_FE;
150 break;
151 case DMA_EITHER_EDGE:
152 val = PCR_DMA_EE;
153 break;
154 case INT_LOGIC_ZERO:
155 val = PCR_INT_LZ;
156 break;
157 case INT_RISING_EDGE:
158 val = PCR_INT_RE;
159 break;
160 case INT_FALLING_EDGE:
161 val = PCR_INT_FE;
162 break;
163 case INT_EITHER_EDGE:
164 val = PCR_INT_EE;
165 break;
166 case INT_LOGIC_ONE:
167 val = PCR_INT_LO;
168 break;
169 default:
170 return (-1);
171 }
172
173 reg = READ4(sc, PORT_PCR(pnum));
174 reg &= ~(PCR_IRQC_M << PCR_IRQC_S);
175 reg |= (val << PCR_IRQC_S);
176 WRITE4(sc, PORT_PCR(pnum), reg);
177
178 pev = &event_map[pnum];
179 pev->ih = ih;
180 pev->ih_user = ih_user;
181 pev->pevt = pevt;
182 pev->enabled = 1;
183
184 return (0);
185 }
186
187 static int
port_probe(device_t dev)188 port_probe(device_t dev)
189 {
190
191 if (!ofw_bus_status_okay(dev))
192 return (ENXIO);
193
194 if (!ofw_bus_is_compatible(dev, "fsl,mvf600-port"))
195 return (ENXIO);
196
197 device_set_desc(dev, "Vybrid Family Port control and interrupts");
198 return (BUS_PROBE_DEFAULT);
199 }
200
201 static int
port_attach(device_t dev)202 port_attach(device_t dev)
203 {
204 struct port_softc *sc;
205 int irq;
206
207 sc = device_get_softc(dev);
208
209 if (bus_alloc_resources(dev, port_spec, sc->res)) {
210 device_printf(dev, "could not allocate resources\n");
211 return (ENXIO);
212 }
213
214 /* Memory interface */
215 sc->bst = rman_get_bustag(sc->res[0]);
216 sc->bsh = rman_get_bushandle(sc->res[0]);
217
218 port_sc = sc;
219
220 for (irq = 0; irq < NPORTS; irq ++) {
221 if ((bus_setup_intr(dev, sc->res[1 + irq], INTR_TYPE_MISC,
222 port_intr, NULL, sc, &sc->gpio_ih[irq]))) {
223 device_printf(dev,
224 "ERROR: Unable to register interrupt handler\n");
225 return (ENXIO);
226 }
227 }
228
229 return (0);
230 }
231
232 static device_method_t port_methods[] = {
233 DEVMETHOD(device_probe, port_probe),
234 DEVMETHOD(device_attach, port_attach),
235 { 0, 0 }
236 };
237
238 static driver_t port_driver = {
239 "port",
240 port_methods,
241 sizeof(struct port_softc),
242 };
243
244 DRIVER_MODULE(port, simplebus, port_driver, 0, 0);
245