xref: /netbsd-src/sys/arch/mips/sibyte/dev/sbgbus.c (revision c7fb772b85b2b5d4cfb282f868f454b4701534fd)
1 /* $NetBSD: sbgbus.c,v 1.15 2021/08/07 16:18:59 thorpej Exp $ */
2 
3 /*
4  * Copyright 2000, 2001
5  * Broadcom Corporation. All rights reserved.
6  *
7  * This software is furnished under license and may be used and copied only
8  * in accordance with the following terms and conditions.  Subject to these
9  * conditions, you may download, copy, install, use, modify and distribute
10  * modified or unmodified copies of this software in source and/or binary
11  * form. No title or ownership is transferred hereby.
12  *
13  * 1) Any source code used, modified or distributed must reproduce and
14  *    retain this copyright notice and list of conditions as they appear in
15  *    the source file.
16  *
17  * 2) No right is granted to use any trade name, trademark, or logo of
18  *    Broadcom Corporation.  The "Broadcom Corporation" name may not be
19  *    used to endorse or promote products derived from this software
20  *    without the prior written permission of Broadcom Corporation.
21  *
22  * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED
23  *    WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
24  *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
25  *    NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE
26  *    FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE
27  *    LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31  *    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
32  *    OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: sbgbus.c,v 1.15 2021/08/07 16:18:59 thorpej Exp $");
37 
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/device.h>
41 
42 #include "ioconf.h"
43 
44 #include <mips/locore.h>
45 
46 #include <sbmips/sb1250/sb1250_regs.h>
47 #include <sbmips/sb1250/sb1250_genbus.h>
48 
49 #include <sbmips/dev/sbobio/sbobiovar.h>
50 #include <sbmips/dev/sbgbus/sbgbusvar.h>
51 
52 static int	sbgbus_match(device_t, cfdata_t, void *);
53 static void	sbgbus_attach(device_t, device_t, void *);
54 
55 CFATTACH_DECL_NEW(sbgbus, 0,
56     sbgbus_match, sbgbus_attach, NULL, NULL);
57 
58 static int	sbgbussearch(device_t, cfdata_t, const int *, void *);
59 static int	sbgbusprint(void *, const char *);
60 
61 static int
sbgbus_match(device_t parent,cfdata_t match,void * aux)62 sbgbus_match(device_t parent, cfdata_t match, void *aux)
63 {
64 	struct sbobio_attach_args *sap = aux;
65 
66 	if (sap->sa_locs.sa_type != SBOBIO_DEVTYPE_GBUS)
67 		return (0);
68 
69 	return 1;
70 }
71 
72 static void
sbgbus_attach(device_t parent,device_t self,void * aux)73 sbgbus_attach(device_t parent, device_t self, void *aux)
74 {
75 
76 	/* Configure children using indirect configuration. */
77 	config_search(self, NULL,
78 	    CFARGS(.search = sbgbussearch));
79 }
80 
81 static int
sbgbusprint(void * aux,const char * pnp)82 sbgbusprint(void *aux, const char *pnp)
83 {
84 	struct sbgbus_attach_args *sga = aux;
85 
86 	if (sga->sga_chipsel != SBGBUS_CHIPSEL_NONE)
87 		aprint_normal(" chipsel %u", sga->sga_chipsel);
88 	if (sga->sga_offset != 0)
89 		aprint_normal(" offset 0x%x", sga->sga_offset);
90 	if (sga->sga_intr[0] != SBGBUS_INTR_NONE) {
91 		aprint_normal(" intr %u", sga->sga_intr[0]);
92 		if (sga->sga_intr[1] != SBGBUS_INTR_NONE) {
93 			aprint_normal(",%u", sga->sga_intr[1]);
94 		}
95 	}
96 	return (UNCONF);
97 }
98 
99 static int
sbgbussearch(device_t parent,cfdata_t cf,const int * ldesc,void * aux)100 sbgbussearch(device_t parent, cfdata_t cf,
101 	     const int *ldesc, void *aux)
102 {
103 	struct sbgbus_attach_args sga;
104 	int tryagain;
105 
106 	do {
107 		/* Fill in sga */
108 		sga.sga_chipsel = cf->cf_loc[SBGBUSCF_CHIPSEL];
109 		sga.sga_offset = cf->cf_loc[SBGBUSCF_OFFSET];
110 		sga.sga_intr[0] = cf->cf_loc[SBGBUSCF_INTR];
111 		sga.sga_intr[1] = cf->cf_loc[SBGBUSCF_INTR_1];
112 
113 		/* Some quick sanity checks. */
114 		if (sga.sga_intr[0] == SBGBUS_INTR_NONE &&
115 		    sga.sga_intr[1] != SBGBUS_INTR_NONE) {
116 			/* XXX probably should print */
117 			return (0);
118 		}
119 		if (sga.sga_chipsel == SBGBUS_CHIPSEL_NONE &&
120 		    sga.sga_offset != 0) {
121 			/* XXX probably should print */
122 			return (0);
123 		}
124 		if (sga.sga_chipsel >= IO_EXT_CFG_COUNT) {
125 			/* XXX probably should print */
126 			return (0);
127 		}
128 
129 		/* XXX check for PCMCIA. */
130 
131 		if (sga.sga_chipsel == SBGBUS_CHIPSEL_NONE) {
132 			sga.sga_startphys = 0;
133 			sga.sga_size = 0;
134 		} else {
135 			uint64_t rv;
136 
137 			rv = mips3_ld((volatile uint64_t *)MIPS_PHYS_TO_KSEG1(
138 			    A_IO_EXT_CS_BASE(sga.sga_chipsel) +
139 			    R_IO_EXT_START_ADDR));
140 			sga.sga_startphys = (rv & M_IO_START_ADDR) << S_IO_ADDRBASE;
141 			rv = mips3_ld((volatile uint64_t *)MIPS_PHYS_TO_KSEG1(
142 			    A_IO_EXT_CS_BASE(sga.sga_chipsel) +
143 			    R_IO_EXT_MULT_SIZE));
144 			sga.sga_size = (rv & M_IO_MULT_SIZE) << S_IO_REGSIZE;
145 
146 			/* Make sure that region is enabled.  */
147 			if (sga.sga_size == 0 ||
148 			    sga.sga_startphys < A_PHYS_GENBUS ||
149 			    sga.sga_startphys >= A_PHYS_GENBUS_END)
150 				return (0);
151 
152 			/* Report to child only the space they can access. */
153 			if (sga.sga_startphys + sga.sga_size > A_PHYS_GENBUS_END)
154 			    sga.sga_size = A_PHYS_GENBUS_END - sga.sga_startphys;
155 		}
156 
157 		tryagain = 0;
158 		if (config_probe(parent, cf, &sga)) {
159 			config_attach(parent, cf, &sga, sbgbusprint, CFARGS_NONE);
160 			tryagain = (cf->cf_fstate == FSTATE_STAR);
161 		}
162 	} while (tryagain);
163 
164 	return (0);
165 }
166