1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/*======================================================================
Device driver for the PCMCIA control functionality of StrongARM
SA-1100 microprocessors.
The contents of this file are subject to the Mozilla Public
License Version 1.1 (the "License"); you may not use this file
except in compliance with the License. You may obtain a copy of
the License at http://www.mozilla.org/MPL/
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
The initial developer of the original code is John G. Dorsey
<john+@cs.cmu.edu>. Portions created by John G. Dorsey are
Copyright (C) 1999 John G. Dorsey. All Rights Reserved.
Alternatively, the contents of this file may be used under the
terms of the GNU Public License version 2 (the "GPL"), in which
case the provisions of the GPL are applicable instead of the
above. If you wish to allow the use of your version of this file
only under the terms of the GPL and not to allow others to use
your version of this file under the MPL, indicate your decision
by deleting the provisions above and replace them with the notice
and other provisions required by the GPL. If you do not delete
the provisions above, a recipient may use your version of this
file under either the MPL or the GPL.
======================================================================*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <asm/arch/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include "soc_common.h"
#include "sa11xx_base.h"
/*
* sa1100_pcmcia_default_mecr_timing
* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
*
* Calculate MECR clock wait states for given CPU clock
* speed and command wait state. This function can be over-
* written by a board specific version.
*
* The default is to simply calculate the BS values as specified in
* the INTEL SA1100 development manual
* "Expansion Memory (PCMCIA) Configuration Register (MECR)"
* that's section 10.2.5 in _my_ version of the manual ;)
*/
static unsigned int
sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt,
unsigned int cpu_speed,
unsigned int cmd_time)
{
return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed);
}
/* sa1100_pcmcia_set_mecr()
* ^^^^^^^^^^^^^^^^^^^^^^^^
*
* set MECR value for socket <sock> based on this sockets
* io, mem and attribute space access speed.
* Call board specific BS value calculation to allow boards
* to tweak the BS values.
*/
static int
sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock)
{
struct soc_pcmcia_timing timing;
u32 mecr, old_mecr;
unsigned long flags;
unsigned int bs_io, bs_mem, bs_attr;
soc_common_pcmcia_get_timing(skt, &timing);
bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io);
bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem);
bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr);
local_irq_save(flags);
old_mecr = mecr = MECR;
MECR_FAST_SET(mecr, skt->nr, 0);
MECR_BSIO_SET(mecr, skt->nr, bs_io);
MECR_BSA_SET(mecr, skt->nr, bs_attr);
MECR_BSM_SET(mecr, skt->nr, bs_mem);
if (old_mecr != mecr)
MECR = mecr;
local_irq_restore(flags);
debug(skt, 2, "FAST %X BSM %X BSA %X BSIO %X\n",
MECR_FAST_GET(mecr, skt->nr),
MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr),
MECR_BSIO_GET(mecr, skt->nr));
return 0;
}
#ifdef CONFIG_CPU_FREQ
static int
sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
unsigned long val,
struct cpufreq_freqs *freqs)
{
switch (val) {
case CPUFREQ_PRECHANGE:
if (freqs->new > freqs->old)
sa1100_pcmcia_set_mecr(skt, freqs->new);
break;
case CPUFREQ_POSTCHANGE:
if (freqs->new < freqs->old)
sa1100_pcmcia_set_mecr(skt, freqs->new);
break;
case CPUFREQ_RESUMECHANGE:
sa1100_pcmcia_set_mecr(skt, freqs->new);
break;
}
return 0;
}
#endif
static int
sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
{
return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0));
}
static int
sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
{
struct soc_pcmcia_timing timing;
unsigned int clock = cpufreq_get(0);
unsigned long mecr = MECR;
char *p = buf;
soc_common_pcmcia_get_timing(skt, &timing);
p+=sprintf(p, "I/O : %u (%u)\n", timing.io,
sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
p+=sprintf(p, "attribute: %u (%u)\n", timing.attr,
sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
p+=sprintf(p, "common : %u (%u)\n", timing.mem,
sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
return p - buf;
}
int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
int first, int nr)
{
/*
* set default MECR calculation if the board specific
* code did not specify one...
*/
if (!ops->get_timing)
ops->get_timing = sa1100_pcmcia_default_mecr_timing;
/* Provide our SA11x0 specific timing routines. */
ops->set_timing = sa1100_pcmcia_set_timing;
ops->show_timing = sa1100_pcmcia_show_timing;
#ifdef CONFIG_CPU_FREQ
ops->frequency_change = sa1100_pcmcia_frequency_change;
#endif
return soc_common_drv_pcmcia_probe(dev, ops, first, nr);
}
EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
static int __init sa11xx_pcmcia_init(void)
{
return 0;
}
fs_initcall(sa11xx_pcmcia_init);
static void __exit sa11xx_pcmcia_exit(void) {}
module_exit(sa11xx_pcmcia_exit);
MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
MODULE_LICENSE("Dual MPL/GPL");
|
