direct-io.hg

view xen/arch/powerpc/dart_u3.c @ 11385:030a041bbe90

[XEN][POWERPC] cleanup for (;;);

When the port first started, we didn't even have panic() working
properly so we used "for(;;);" loops to stop execution. Now that output
is buffered these look like hangs, since you usually do not see the
printk() before.

Signed-off-by: Jimi Xenidis <jimix@watson.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
author Jimi Xenidis <jimix@watson.ibm.com>
date Tue Aug 29 06:53:58 2006 -0400 (2006-08-29)
parents 050de6b53961
children
line source
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
15 *
16 * Copyright (C) IBM Corp. 2005
17 *
18 * Authors: Jimi Xenidis <jimix@watson.ibm.com>
19 */
21 #undef DEBUG
23 #include <xen/config.h>
24 #include <xen/types.h>
25 #include <xen/sched.h>
26 #include <xen/mm.h>
27 #include <public/xen.h>
28 #include <asm/io.h>
29 #include <asm/current.h>
30 #include "tce.h"
31 #include "iommu.h"
32 #include "dart.h"
34 union dart_ctl {
35 u32 dc_word;
36 struct {
37 u32 dc_base:20;
38 u32 dc_stop_access:1;
39 u32 dc_invtlb:1;
40 u32 dc_enable:1;
41 u32 dc_size:9;
42 } reg;
43 };
45 static u32 volatile *dart_ctl_reg;
47 static void u3_inv_all(void)
48 {
49 union dart_ctl dc;
50 ulong r = 0;
51 int l = 0;
53 for (;;) {
54 dc.dc_word = in_32(dart_ctl_reg);
55 dc.reg.dc_invtlb = 1;
56 out_32(dart_ctl_reg, dc.dc_word);
58 do {
59 dc.dc_word = in_32(dart_ctl_reg);
60 r++;
61 } while ((dc.reg.dc_invtlb == 1) && (r < (1 << l)));
63 if (r == (1 << l)) {
64 if (l < 4) {
65 l++;
66 dc.dc_word = in_32(dart_ctl_reg);
67 dc.reg.dc_invtlb = 0;
68 out_32(dart_ctl_reg, dc.dc_word);
69 continue;
70 } else {
71 panic(" broken U3???\n");
72 }
73 }
74 return;
75 }
76 }
78 static void u3_inv_entry(ulong pg)
79 {
80 /* sadly single entry invalidation has been reported not to work */
81 u3_inv_all();
82 }
84 static struct dart_ops u3_ops = {
85 .do_inv_all = u3_inv_all,
86 .do_inv_entry = u3_inv_entry,
87 };
89 struct dart_ops *u3_init(ulong base, ulong table, ulong dart_pages)
90 {
91 union dart_ctl dc;
93 dart_ctl_reg = (u32 *)base;
95 dc.dc_word = 0;
97 dc.reg.dc_base = table >> PAGE_SHIFT;
98 dc.reg.dc_size = dart_pages;
99 dc.reg.dc_enable = 1;
102 printk("Initializing DART Model U3: reg: %p word: %x\n",
103 dart_ctl_reg, dc.dc_word);
105 out_32(dart_ctl_reg, dc.dc_word);
107 return &u3_ops;
108 }