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#include <linux/io.h>
40#include <linux/slab.h>
41
42#include <mach/hardware.h>
43#include <asm/irq.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	}
129
130	return 0;
131}
132
133#endif
134
135static int
136sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
137{
138	unsigned long clk = clk_get_rate(skt->clk);
139
140	return sa1100_pcmcia_set_mecr(skt, clk / 1000);
141}
142
143static int
144sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
145{
146	struct soc_pcmcia_timing timing;
147	unsigned int clock = clk_get_rate(skt->clk) / 1000;
148	unsigned long mecr = MECR;
149	char *p = buf;
150
151	soc_common_pcmcia_get_timing(skt, &timing);
152
153	p+=sprintf(p, "I/O      : %uns (%uns)\n", timing.io,
154		   sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
155
156	p+=sprintf(p, "attribute: %uns (%uns)\n", timing.attr,
157		   sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
158
159	p+=sprintf(p, "common   : %uns (%uns)\n", timing.mem,
160		   sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
161
162	return p - buf;
163}
164
165static const char *skt_names[] = {
166	"PCMCIA socket 0",
167	"PCMCIA socket 1",
168};
169
170#define SKT_DEV_INFO_SIZE(n) \
171	(sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
172
173int sa11xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
174{
175	skt->res_skt.start = _PCMCIA(skt->nr);
176	skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
177	skt->res_skt.name = skt_names[skt->nr];
178	skt->res_skt.flags = IORESOURCE_MEM;
179
180	skt->res_io.start = _PCMCIAIO(skt->nr);
181	skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
182	skt->res_io.name = "io";
183	skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
184
185	skt->res_mem.start = _PCMCIAMem(skt->nr);
186	skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
187	skt->res_mem.name = "memory";
188	skt->res_mem.flags = IORESOURCE_MEM;
189
190	skt->res_attr.start = _PCMCIAAttr(skt->nr);
191	skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
192	skt->res_attr.name = "attribute";
193	skt->res_attr.flags = IORESOURCE_MEM;
194
195	return soc_pcmcia_add_one(skt);
196}
197EXPORT_SYMBOL(sa11xx_drv_pcmcia_add_one);
198
199void sa11xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
200{
201	/*
202	 * set default MECR calculation if the board specific
203	 * code did not specify one...
204	 */
205	if (!ops->get_timing)
206		ops->get_timing = sa1100_pcmcia_default_mecr_timing;
207
208	/* Provide our SA11x0 specific timing routines. */
209	ops->set_timing  = sa1100_pcmcia_set_timing;
210	ops->show_timing = sa1100_pcmcia_show_timing;
211#ifdef CONFIG_CPU_FREQ
212	ops->frequency_change = sa1100_pcmcia_frequency_change;
213#endif
214}
215EXPORT_SYMBOL(sa11xx_drv_pcmcia_ops);
216
217int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
218			    int first, int nr)
219{
220	struct skt_dev_info *sinfo;
221	struct soc_pcmcia_socket *skt;
222	int i, ret = 0;
223	struct clk *clk;
224
225	clk = devm_clk_get(dev, NULL);
226	if (IS_ERR(clk))
227		return PTR_ERR(clk);
228
229	sa11xx_drv_pcmcia_ops(ops);
230
231	sinfo = devm_kzalloc(dev, SKT_DEV_INFO_SIZE(nr), GFP_KERNEL);
232	if (!sinfo)
233		return -ENOMEM;
234
235	sinfo->nskt = nr;
236
237	/* Initialize processor specific parameters */
238	for (i = 0; i < nr; i++) {
239		skt = &sinfo->skt[i];
240
241		skt->nr = first + i;
242		skt->clk = clk;
243		soc_pcmcia_init_one(skt, ops, dev);
244
245		ret = sa11xx_drv_pcmcia_add_one(skt);
246		if (ret)
247			break;
248	}
249
250	if (ret) {
251		while (--i >= 0)
252			soc_pcmcia_remove_one(&sinfo->skt[i]);
253	} else {
254		dev_set_drvdata(dev, sinfo);
255	}
256
257	return ret;
258}
259EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
260
261MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
262MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
263MODULE_LICENSE("Dual MPL/GPL");
264