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 */
62 static unsigned int
sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket * skt,unsigned int cpu_speed,unsigned int cmd_time)63 sa1100_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 */
78 static int
sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket * skt,unsigned int cpu_clock)79 sa1100_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
113 static int
sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket * skt,unsigned long val,struct cpufreq_freqs * freqs)114 sa1100_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
135 static int
sa1100_pcmcia_set_timing(struct soc_pcmcia_socket * skt)136 sa1100_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
143 static int
sa1100_pcmcia_show_timing(struct soc_pcmcia_socket * skt,char * buf)144 sa1100_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
165 static 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
sa11xx_drv_pcmcia_add_one(struct soc_pcmcia_socket * skt)173 int 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 }
197 EXPORT_SYMBOL(sa11xx_drv_pcmcia_add_one);
198
sa11xx_drv_pcmcia_ops(struct pcmcia_low_level * ops)199 void 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 }
215 EXPORT_SYMBOL(sa11xx_drv_pcmcia_ops);
216
sa11xx_drv_pcmcia_probe(struct device * dev,struct pcmcia_low_level * ops,int first,int nr)217 int 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 }
259 EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
260
261 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
262 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
263 MODULE_LICENSE("Dual MPL/GPL");
264