Annotation of sys/arch/i386/pci/geodesc.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: geodesc.c,v 1.9 2006/12/11 20:57:40 deraadt Exp $ */
2:
3: /*
4: * Copyright (c) 2003 Markus Friedl <markus@openbsd.org>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: /*
20: * Geode SC1100 Information Appliance On a Chip
21: * http://www.national.com/ds.cgi/SC/SC1100.pdf
22: */
23:
24: #include <sys/cdefs.h>
25: #include <sys/param.h>
26: #include <sys/systm.h>
27: #include <sys/device.h>
28: #ifdef __HAVE_TIMECOUNTER
29: #include <sys/timetc.h>
30: #endif
31:
32: #include <machine/bus.h>
33:
34: #include <dev/pci/pcivar.h>
35: #include <dev/pci/pcidevs.h>
36:
37: #include <arch/i386/pci/geodescreg.h>
38:
39: struct geodesc_softc {
40: struct device sc_dev;
41: bus_space_tag_t sc_iot;
42: bus_space_handle_t sc_ioh;
43: };
44:
45: int geodesc_match(struct device *, void *, void *);
46: void geodesc_attach(struct device *, struct device *, void *);
47: void sc1100_sysreset(void);
48:
49: #ifndef SMALL_KERNEL
50: int geodesc_wdogctl_cb(void *, int);
51: #endif /* SMALL_KERNEL */
52:
53: struct cfattach geodesc_ca = {
54: sizeof(struct geodesc_softc), geodesc_match, geodesc_attach
55: };
56:
57: struct cfdriver geodesc_cd = {
58: NULL, "geodesc", DV_DULL
59: };
60:
61: #ifdef __HAVE_TIMECOUNTER
62: u_int geodesc_get_timecount(struct timecounter *tc);
63:
64: struct timecounter geodesc_timecounter = {
65: geodesc_get_timecount, /* get_timecount */
66: 0, /* no poll_pps */
67: 0xffffffff, /* counter_mask */
68: 27000000, /* frequency */
69: "GEOTSC", /* name */
70: 2000 /* quality */
71: };
72: #endif /* __HAVE_TIMECOUNTER */
73:
74: int
75: geodesc_match(struct device *parent, void *match, void *aux)
76: {
77: struct pci_attach_args *pa = aux;
78:
79: if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_NS &&
80: (PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SC1100_XBUS ||
81: PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_NS_SCx200_XBUS))
82: return (1);
83: return (0);
84: }
85:
86: #define WDSTSBITS "\20\x04WDRST\x03WDSMI\x02WDINT\x01WDOVF"
87:
88: void
89: geodesc_attach(struct device *parent, struct device *self, void *aux)
90: {
91: struct geodesc_softc *sc = (void *) self;
92: struct pci_attach_args *pa = aux;
93: uint16_t cnfg, cba;
94: uint8_t sts, rev, iid;
95: pcireg_t reg;
96: extern void (*cpuresetfn)(void);
97:
98: reg = pci_conf_read(pa->pa_pc, pa->pa_tag, SC1100_F5_SCRATCHPAD);
99: sc->sc_iot = pa->pa_iot;
100: if (reg == 0 ||
101: bus_space_map(sc->sc_iot, reg, 64, 0, &sc->sc_ioh)) {
102: printf(": unable to map registers at 0x%x\n", reg);
103: return;
104: }
105: cba = bus_space_read_2(sc->sc_iot, sc->sc_ioh, GCB_CBA);
106: if (cba != reg) {
107: printf(": cba mismatch: cba 0x%x != reg 0x%x\n", cba, reg);
108: bus_space_unmap(sc->sc_iot, sc->sc_ioh, 64);
109: return;
110: }
111: sts = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_WDSTS);
112: cnfg = bus_space_read_2(sc->sc_iot, sc->sc_ioh, GCB_WDCNFG);
113: iid = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_IID);
114: rev = bus_space_read_1(sc->sc_iot, sc->sc_ioh, GCB_REV);
115:
116: printf(": iid %d revision %d wdstatus %b\n", iid, rev, sts, WDSTSBITS);
117:
118: #ifndef SMALL_KERNEL
119: /* setup and register watchdog */
120: bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDTO, 0);
121: sts |= WDOVF_CLEAR;
122: bus_space_write_1(sc->sc_iot, sc->sc_ioh, GCB_WDSTS, sts);
123: cnfg &= ~WDCNFG_MASK;
124: cnfg |= WDTYPE1_RESET|WDPRES_DIV_512;
125: bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDCNFG, cnfg);
126:
127: wdog_register(sc, geodesc_wdogctl_cb);
128: #endif /* SMALL_KERNEL */
129:
130: #ifdef __HAVE_TIMECOUNTER
131: bus_space_write_4(sc->sc_iot, sc->sc_ioh, GCB_TSCNFG, TSC_ENABLE);
132: /* Hook into the kern_tc */
133: geodesc_timecounter.tc_priv = sc;
134: tc_init(&geodesc_timecounter);
135: #endif /* __HAVE_TIMECOUNTER */
136:
137: /* We have a special way to reset the CPU on the SC1100 */
138: cpuresetfn = sc1100_sysreset;
139: }
140:
141: #ifndef SMALL_KERNEL
142: int
143: geodesc_wdogctl_cb(void *self, int period)
144: {
145: struct geodesc_softc *sc = self;
146:
147: if (period > 0x03ff)
148: period = 0x03ff;
149: bus_space_write_2(sc->sc_iot, sc->sc_ioh, GCB_WDTO, period * 64);
150: return (period);
151: }
152: #endif /* SMALL_KERNEL */
153:
154: #ifdef __HAVE_TIMECOUNTER
155: u_int
156: geodesc_get_timecount(struct timecounter *tc)
157: {
158: struct geodesc_softc *sc = tc->tc_priv;
159:
160: return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, GCB_TSC));
161: }
162: #endif /* __HAVE_TIMECOUNTER */
163:
164: void
165: sc1100_sysreset(void)
166: {
167: /*
168: * Reset AMD Geode SC1100.
169: *
170: * 1) Write PCI Configuration Address Register (0xcf8) to
171: * select Function 0, Register 0x44: Bridge Configuration,
172: * GPIO and LPC Configuration Register Space, Reset
173: * Control Register.
174: *
175: * 2) Write 0xf to PCI Configuration Data Register (0xcfc)
176: * to reset IDE controller, IDE bus, and PCI bus, and
177: * to trigger a system-wide reset.
178: *
179: * See AMD Geode SC1100 Processor Data Book, Revision 2.0,
180: * sections 6.3.1, 6.3.2, and 6.4.1.
181: */
182: outl(0xCF8, 0x80009044UL);
183: outb(0xCFC, 0x0F);
184: }
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