pc98_machdep.c revision 39246 
1/*
2 * Copyright (c) KATO Takenori, 1996, 1997.
3 *
4 * All rights reserved.  Unpublished rights reserved under the copyright
5 * laws of Japan.
6 *
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer as
13 *    the first lines of this file unmodified.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "opt_pc98.h"
33
34#include <sys/param.h>
35#include <sys/systm.h>
36
37#include <cam/cam.h>
38#include <cam/cam_ccb.h>
39
40#include <pc98/pc98/pc98.h>
41#include <pc98/pc98/pc98_machdep.h>
42
43extern	int Maxmem;
44extern	int Maxmem_under16M;
45
46#ifdef notyet
47static	void init_cpu_accel_mem __P((void));
48#endif
49
50/*
51 * Initialize DMA controller
52 */
53void
54pc98_init_dmac(void)
55{
56	outb(0x439, (inb(0x439) & 0xfb));	/* DMA Accsess Control over 1MB */
57	outb(0x29, (0x0c | 0));				/* Bank Mode Reg. 16M mode */
58	outb(0x29, (0x0c | 1));				/* Bank Mode Reg. 16M mode */
59	outb(0x29, (0x0c | 2));				/* Bank Mode Reg. 16M mode */
60	outb(0x29, (0x0c | 3));				/* Bank Mode Reg. 16M mode */
61	outb(0x11, 0x50);
62}
63
64#ifdef EPSON_MEMWIN
65static	void init_epson_memwin __P((void));
66
67/*
68 * Disconnect phisical memory in 15-16MB region.
69 *
70 * EPSON PC-486GR, P, SR, SE, HX, HG and HA only.  Other system support
71 * this feature with software DIP switch.
72 */
73static void
74init_epson_memwin(void)
75{
76
77	if (pc98_machine_type & M_EPSON_PC98) {
78		if (Maxmem > 3840) {
79			if (Maxmem == Maxmem_under16M) {
80				Maxmem = 3840;
81				Maxmem_under16M = 3840;
82			} else if (Maxmem_under16M > 3840) {
83				Maxmem_under16M = 3840;
84			}
85		}
86
87		/* Disable 15MB-16MB caching. */
88		switch (epson_machine_id) {
89		case 0x34:	/* PC486HX */
90		case 0x35:	/* PC486HG */
91		case 0x3B:	/* PC486HA */
92			/* Cache control start. */
93			outb(0x43f, 0x42);
94			outw(0xc40, 0x0033);
95
96			/* Disable 0xF00000-0xFFFFFF. */
97			outb(0xc48, 0x49);
98			outb(0xc4c, 0x00);
99			outb(0xc48, 0x48);
100			outb(0xc4c, 0xf0);
101			outb(0xc48, 0x4d);
102			outb(0xc4c, 0x00);
103			outb(0xc48, 0x4c);
104			outb(0xc4c, 0xff);
105			outb(0xc48, 0x4f);
106			outb(0xc4c, 0x00);
107
108			/* Cache control end. */
109			outb(0x43f, 0x40);
110			break;
111
112		case 0x2B:	/* PC486GR/GF */
113		case 0x30:	/* PC486P */
114		case 0x31:	/* PC486GRSuper */
115		case 0x32:	/* PC486GR+ */
116		case 0x37:	/* PC486SE */
117		case 0x38:	/* PC486SR */
118			/* Disable 0xF00000-0xFFFFFF. */
119			outb(0x43f, 0x42);
120			outb(0x467, 0xe0);
121			outb(0x567, 0xd8);
122
123			outb(0x43f, 0x40);
124			outb(0x467, 0xe0);
125			outb(0x567, 0xe0);
126			break;
127		}
128
129		/* Disable 15MB-16MB RAM and enable memory window. */
130		outb(0x43b, inb(0x43b) & 0xfd);	/* Clear bit1. */
131	}
132}
133#endif
134
135#ifdef notyet
136static	void init_cpu_accel_mem(void);
137
138static void
139init_cpu_accel_mem(void)
140{
141	u_int target_page;
142	/*
143	 * Certain 'CPU accelerator' supports over 16MB memory on
144	 * the machines whose BIOS doesn't store true size.
145	 * To support this, we don't trust BIOS values if Maxmem < 4096.
146	 */
147	if (Maxmem < 4096) {
148		for (target_page = ptoa(4096);		/* 16MB */
149			 target_page < ptoa(32768);		/* 128MB */
150			 target_page += 256 * PAGE_SIZE	/* 1MB step */) {
151			u_int tmp, page_bad = FALSE, OrigMaxmem = Maxmem;
152
153			*(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page;
154			invltlb();
155
156			tmp = *(u_int *)CADDR1;
157			/*
158			 * Test for alternating 1's and 0's
159			 */
160			*(volatile u_int *)CADDR1 = 0xaaaaaaaa;
161			if (*(volatile u_int *)CADDR1 != 0xaaaaaaaa) {
162				page_bad = TRUE;
163			}
164			/*
165			 * Test for alternating 0's and 1's
166			 */
167			*(volatile u_int *)CADDR1 = 0x55555555;
168			if (*(volatile u_int *)CADDR1 != 0x55555555) {
169				page_bad = TRUE;
170			}
171			/*
172			 * Test for all 1's
173			 */
174			*(volatile u_int *)CADDR1 = 0xffffffff;
175			if (*(volatile u_int *)CADDR1 != 0xffffffff) {
176				page_bad = TRUE;
177			}
178			/*
179			 * Test for all 0's
180			 */
181			*(volatile u_int *)CADDR1 = 0x0;
182			if (*(volatile u_int *)CADDR1 != 0x0) {
183				/*
184				 * test of page failed
185				 */
186				page_bad = TRUE;
187			}
188			/*
189			 * Restore original value.
190			 */
191			*(u_int *)CADDR1 = tmp;
192			if (page_bad == TRUE) {
193				Maxmem = atop(target_page) + 256;
194			} else
195				break;
196		}
197		*(int *)CMAP1 = 0;
198		invltlb();
199	}
200}
201#endif
202
203/*
204 * Get physical memory size
205 */
206void
207pc98_getmemsize(void)
208{
209	unsigned char under16, over16;
210
211	/* available protected memory size under 16MB / 128KB */
212	under16 = PC98_SYSTEM_PARAMETER(0x401);
213	/* available protected memory size over 16MB / 1MB */
214	over16 = PC98_SYSTEM_PARAMETER(0x594);
215	/* add conventional memory size (1024KB / 128KB = 8) */
216	under16 += 8;
217
218	Maxmem = Maxmem_under16M = under16 * 128 * 1024 / PAGE_SIZE;
219	Maxmem += (over16 * 1024 * 1024 / PAGE_SIZE);
220#ifdef EPSON_MEMWIN
221	init_epson_memwin();
222#endif
223}
224
225#include "da.h"
226
227#if NDA > 0
228/*
229 * Read a geometry information of SCSI HDD from BIOS work area.
230 *
231 * XXX - Before reading BIOS work area, we should check whether
232 * host adapter support it.
233 */
234int
235scsi_da_bios_params(struct ccb_calc_geometry *ccg)
236{
237	u_char *tmp;
238	int	target;
239	int	bus;
240
241	target = ccg->ccb_h.target_id;
242	bus    = 0;  /* If your really need to know, send a PathInq CCB */
243
244	tmp = (u_char *)&PC98_SYSTEM_PARAMETER(0x460 + target*4);
245	if ((PC98_SYSTEM_PARAMETER(0x482) & ((1 << target)&0xff)) != 0) {
246		ccg->secs_per_track = *tmp;
247		ccg->cylinders = ((*(tmp+3)<<8)|*(tmp+2))&0xfff;
248#if 0
249		switch (*(tmp + 3) & 0x30) {
250		case 0x00:
251			disk_parms->secsiz = 256;
252			printf("Warning!: not supported.\n");
253			break;
254		case 0x10:
255			disk_parms->secsiz = 512;
256			break;
257		case 0x20:
258			disk_parms->secsiz = 1024;
259			break;
260		default:
261			disk_parms->secsiz = 512;
262			printf("Warning!: not supported. But force to 512\n");
263			break;
264		}
265#endif
266		if (*(tmp+3) & 0x40) {
267			ccg->cylinders += (*(tmp+1)&0xf0)<<8;
268			ccg->heads = *(tmp+1)&0x0f;
269		} else {
270			ccg->heads = *(tmp+1);
271		}
272		return 1;
273	}
274	return 0;
275}
276#endif
277