1/*======================================================================
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/cpufreq.h>
36#include <linux/ioport.h>
37#include <linux/kernel.h>
38#include <linux/spinlock.h>
39
40#include <asm/hardware.h>
41#include <asm/io.h>
42#include <asm/irq.h>
43#include <asm/system.h>
44
45#include "soc_common.h"
46#include "sa11xx_base.h"
47
48
49/*
50 * sa1100_pcmcia_default_mecr_timing
51 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
52 *
53 * Calculate MECR clock wait states for given CPU clock
54 * speed and command wait state. This function can be over-
55 * written by a board specific version.
56 *
57 * The default is to simply calculate the BS values as specified in
58 * the INTEL SA1100 development manual
59 * "Expansion Memory (PCMCIA) Configuration Register (MECR)"
60 * that's section 10.2.5 in _my_ version of the manual ;)
61 */
62static unsigned int
63sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt,
64				  unsigned int cpu_speed,
65				  unsigned int cmd_time)
66{
67	return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed);
68}
69
70/* sa1100_pcmcia_set_mecr()
71 * ^^^^^^^^^^^^^^^^^^^^^^^^
72 *
73 * set MECR value for socket <sock> based on this sockets
74 * io, mem and attribute space access speed.
75 * Call board specific BS value calculation to allow boards
76 * to tweak the BS values.
77 */
78static int
79sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock)
80{
81	struct soc_pcmcia_timing timing;
82	u32 mecr, old_mecr;
83	unsigned long flags;
84	unsigned int bs_io, bs_mem, bs_attr;
85
86	soc_common_pcmcia_get_timing(skt, &timing);
87
88	bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io);
89	bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem);
90	bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr);
91
92	local_irq_save(flags);
93
94	old_mecr = mecr = MECR;
95	MECR_FAST_SET(mecr, skt->nr, 0);
96	MECR_BSIO_SET(mecr, skt->nr, bs_io);
97	MECR_BSA_SET(mecr, skt->nr, bs_attr);
98	MECR_BSM_SET(mecr, skt->nr, bs_mem);
99	if (old_mecr != mecr)
100		MECR = mecr;
101
102	local_irq_restore(flags);
103
104	debug(skt, 2, "FAST %X  BSM %X  BSA %X  BSIO %X\n",
105	      MECR_FAST_GET(mecr, skt->nr),
106	      MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr),
107	      MECR_BSIO_GET(mecr, skt->nr));
108
109	return 0;
110}
111
112#ifdef CONFIG_CPU_FREQ
113static int
114sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
115			       unsigned long val,
116			       struct cpufreq_freqs *freqs)
117{
118	switch (val) {
119	case CPUFREQ_PRECHANGE:
120		if (freqs->new > freqs->old)
121			sa1100_pcmcia_set_mecr(skt, freqs->new);
122		break;
123
124	case CPUFREQ_POSTCHANGE:
125		if (freqs->new < freqs->old)
126			sa1100_pcmcia_set_mecr(skt, freqs->new);
127		break;
128	case CPUFREQ_RESUMECHANGE:
129		sa1100_pcmcia_set_mecr(skt, freqs->new);
130		break;
131	}
132
133	return 0;
134}
135
136#endif
137
138static int
139sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
140{
141	return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0));
142}
143
144static int
145sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
146{
147	struct soc_pcmcia_timing timing;
148	unsigned int clock = cpufreq_get(0);
149	unsigned long mecr = MECR;
150	char *p = buf;
151
152	soc_common_pcmcia_get_timing(skt, &timing);
153
154	p+=sprintf(p, "I/O      : %u (%u)\n", timing.io,
155		   sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
156
157	p+=sprintf(p, "attribute: %u (%u)\n", timing.attr,
158		   sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
159
160	p+=sprintf(p, "common   : %u (%u)\n", timing.mem,
161		   sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
162
163	return p - buf;
164}
165
166int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
167			    int first, int nr)
168{
169	/*
170	 * set default MECR calculation if the board specific
171	 * code did not specify one...
172	 */
173	if (!ops->get_timing)
174		ops->get_timing = sa1100_pcmcia_default_mecr_timing;
175
176	/* Provide our SA11x0 specific timing routines. */
177	ops->set_timing  = sa1100_pcmcia_set_timing;
178	ops->show_timing = sa1100_pcmcia_show_timing;
179#ifdef CONFIG_CPU_FREQ
180	ops->frequency_change = sa1100_pcmcia_frequency_change;
181#endif
182
183	return soc_common_drv_pcmcia_probe(dev, ops, first, nr);
184}
185EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
186
187static int __init sa11xx_pcmcia_init(void)
188{
189	return 0;
190}
191fs_initcall(sa11xx_pcmcia_init);
192
193static void __exit sa11xx_pcmcia_exit(void) {}
194
195module_exit(sa11xx_pcmcia_exit);
196
197MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
198MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
199MODULE_LICENSE("Dual MPL/GPL");
200