1 /* $NetBSD: i80312_mem.c,v 1.6 2018/07/31 06:46:25 skrll Exp $ */
2
3 /*
4 * Copyright (c) 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * Intel i80312 Companion I/O memory controller support.
40 */
41
42 #include "opt_arm_debug.h"
43
44 #include <sys/cdefs.h>
45 __KERNEL_RCSID(0, "$NetBSD: i80312_mem.c,v 1.6 2018/07/31 06:46:25 skrll Exp $");
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49
50 #include <sys/bus.h>
51
52 #include <arm/xscale/i80312reg.h>
53 #include <arm/xscale/i80312var.h>
54
55 /*
56 * i80312_sdram_bounds:
57 *
58 * Retrieve the start and size of SDRAM.
59 */
60 void
i80312_sdram_bounds(bus_space_tag_t st,bus_space_handle_t sh,paddr_t * start,psize_t * size)61 i80312_sdram_bounds(bus_space_tag_t st, bus_space_handle_t sh,
62 paddr_t *start, psize_t *size)
63 {
64 uint32_t sdbr, sbr0, sbr1;
65 uint32_t bank0, bank1;
66
67 sdbr = bus_space_read_4(st, sh, I80312_MEM_SB);
68 sbr0 = bus_space_read_4(st, sh, I80312_MEM_SB0);
69 sbr1 = bus_space_read_4(st, sh, I80312_MEM_SB1);
70
71 #ifdef VERBOSE_INIT_ARM
72 printf("i80312: SBDR = 0x%08x SBR0 = 0x%08x SBR1 = 0x%08x\n",
73 sdbr, sbr0, sbr1);
74 #endif
75
76 *start = sdbr;
77
78 sdbr = (sdbr >> 25) & 0xf;
79
80 sbr0 = ((sbr0 >> 3) & 0x1f) - sdbr;
81 sbr1 = ((sbr1 >> 3) & 0x1f) - sbr0;
82
83 bank0 = sbr0 << 25;
84 bank1 = sbr1 << 25;
85
86 #ifdef VERBOSE_INIT_ARM
87 printf("i80312: BANK0 = 0x%08x BANK1 = 0x%08x\n", bank0, bank1);
88 #endif
89
90 *size = bank0 + bank1;
91 }
92