blob: db04ffb6f68c564cca51f335c81b92686229364e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*======================================================================
2
3 Device driver for the PCMCIA control functionality of StrongARM
4 SA-1100 microprocessors.
5
6 The contents of this file are subject to the Mozilla Public
7 License Version 1.1 (the "License"); you may not use this file
8 except in compliance with the License. You may obtain a copy of
9 the License at http://www.mozilla.org/MPL/
10
11 Software distributed under the License is distributed on an "AS
12 IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
13 implied. See the License for the specific language governing
14 rights and limitations under the License.
15
16 The initial developer of the original code is John G. Dorsey
17 <john+@cs.cmu.edu>. Portions created by John G. Dorsey are
18 Copyright (C) 1999 John G. Dorsey. All Rights Reserved.
19
20 Alternatively, the contents of this file may be used under the
21 terms of the GNU Public License version 2 (the "GPL"), in which
22 case the provisions of the GPL are applicable instead of the
23 above. If you wish to allow the use of your version of this file
24 only under the terms of the GPL and not to allow others to use
25 your version of this file under the MPL, indicate your decision
26 by deleting the provisions above and replace them with the notice
27 and other provisions required by the GPL. If you do not delete
28 the provisions above, a recipient may use your version of this
29 file under either the MPL or the GPL.
30
31======================================================================*/
32
33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/config.h>
36#include <linux/cpufreq.h>
37#include <linux/ioport.h>
38#include <linux/kernel.h>
39#include <linux/spinlock.h>
40
41#include <asm/hardware.h>
42#include <asm/io.h>
43#include <asm/irq.h>
44#include <asm/system.h>
45
46#include "soc_common.h"
47#include "sa11xx_base.h"
48
49
50/*
51 * sa1100_pcmcia_default_mecr_timing
52 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
53 *
54 * Calculate MECR clock wait states for given CPU clock
55 * speed and command wait state. This function can be over-
56 * written by a board specific version.
57 *
58 * The default is to simply calculate the BS values as specified in
59 * the INTEL SA1100 development manual
60 * "Expansion Memory (PCMCIA) Configuration Register (MECR)"
61 * that's section 10.2.5 in _my_ version of the manual ;)
62 */
63static unsigned int
64sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt,
65 unsigned int cpu_speed,
66 unsigned int cmd_time)
67{
68 return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed);
69}
70
71/* sa1100_pcmcia_set_mecr()
72 * ^^^^^^^^^^^^^^^^^^^^^^^^
73 *
74 * set MECR value for socket <sock> based on this sockets
75 * io, mem and attribute space access speed.
76 * Call board specific BS value calculation to allow boards
77 * to tweak the BS values.
78 */
79static int
80sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock)
81{
82 struct soc_pcmcia_timing timing;
83 u32 mecr, old_mecr;
84 unsigned long flags;
85 unsigned int bs_io, bs_mem, bs_attr;
86
87 soc_common_pcmcia_get_timing(skt, &timing);
88
89 bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io);
90 bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem);
91 bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr);
92
93 local_irq_save(flags);
94
95 old_mecr = mecr = MECR;
96 MECR_FAST_SET(mecr, skt->nr, 0);
97 MECR_BSIO_SET(mecr, skt->nr, bs_io);
98 MECR_BSA_SET(mecr, skt->nr, bs_attr);
99 MECR_BSM_SET(mecr, skt->nr, bs_mem);
100 if (old_mecr != mecr)
101 MECR = mecr;
102
103 local_irq_restore(flags);
104
105 debug(skt, 2, "FAST %X BSM %X BSA %X BSIO %X\n",
106 MECR_FAST_GET(mecr, skt->nr),
107 MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr),
108 MECR_BSIO_GET(mecr, skt->nr));
109
110 return 0;
111}
112
113#ifdef CONFIG_CPU_FREQ
114static int
115sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
116 unsigned long val,
117 struct cpufreq_freqs *freqs)
118{
119 switch (val) {
120 case CPUFREQ_PRECHANGE:
121 if (freqs->new > freqs->old)
122 sa1100_pcmcia_set_mecr(skt, freqs->new);
123 break;
124
125 case CPUFREQ_POSTCHANGE:
126 if (freqs->new < freqs->old)
127 sa1100_pcmcia_set_mecr(skt, freqs->new);
128 break;
129 case CPUFREQ_RESUMECHANGE:
130 sa1100_pcmcia_set_mecr(skt, freqs->new);
131 break;
132 }
133
134 return 0;
135}
136
137#endif
138
139static int
140sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
141{
142 return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0));
143}
144
145static int
146sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
147{
148 struct soc_pcmcia_timing timing;
149 unsigned int clock = cpufreq_get(0);
150 unsigned long mecr = MECR;
151 char *p = buf;
152
153 soc_common_pcmcia_get_timing(skt, &timing);
154
155 p+=sprintf(p, "I/O : %u (%u)\n", timing.io,
156 sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
157
158 p+=sprintf(p, "attribute: %u (%u)\n", timing.attr,
159 sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
160
161 p+=sprintf(p, "common : %u (%u)\n", timing.mem,
162 sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
163
164 return p - buf;
165}
166
167int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
168 int first, int nr)
169{
170 /*
171 * set default MECR calculation if the board specific
172 * code did not specify one...
173 */
174 if (!ops->get_timing)
175 ops->get_timing = sa1100_pcmcia_default_mecr_timing;
176
177 /* Provide our SA11x0 specific timing routines. */
178 ops->set_timing = sa1100_pcmcia_set_timing;
179 ops->show_timing = sa1100_pcmcia_show_timing;
180#ifdef CONFIG_CPU_FREQ
181 ops->frequency_change = sa1100_pcmcia_frequency_change;
182#endif
183
184 return soc_common_drv_pcmcia_probe(dev, ops, first, nr);
185}
186EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
187
188static int __init sa11xx_pcmcia_init(void)
189{
190 return 0;
191}
192module_init(sa11xx_pcmcia_init);
193
194static void __exit sa11xx_pcmcia_exit(void) {}
195
196module_exit(sa11xx_pcmcia_exit);
197
198MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
199MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
200MODULE_LICENSE("Dual MPL/GPL");