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perf_counter: add an mmap method to allow userspace to read hardware counters
[deliverable/linux.git] / drivers / pcmcia / pxa2xx_base.c
1 /*======================================================================
2
3 Device driver for the PCMCIA control functionality of PXA2xx
4 microprocessors.
5
6 The contents of this file may be used under the
7 terms of the GNU Public License version 2 (the "GPL")
8
9 (c) Ian Molton (spyro@f2s.com) 2003
10 (c) Stefan Eletzhofer (stefan.eletzhofer@inquant.de) 2003,4
11
12 derived from sa11xx_base.c
13
14 Portions created by John G. Dorsey are
15 Copyright (C) 1999 John G. Dorsey.
16
17 ======================================================================*/
18
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/cpufreq.h>
22 #include <linux/ioport.h>
23 #include <linux/kernel.h>
24 #include <linux/spinlock.h>
25 #include <linux/platform_device.h>
26
27 #include <mach/hardware.h>
28 #include <asm/io.h>
29 #include <asm/irq.h>
30 #include <asm/system.h>
31 #include <mach/pxa2xx-regs.h>
32 #include <asm/mach-types.h>
33
34 #include <pcmcia/cs_types.h>
35 #include <pcmcia/ss.h>
36 #include <pcmcia/cistpl.h>
37
38 #include "soc_common.h"
39 #include "pxa2xx_base.h"
40
41 /*
42 * Personal Computer Memory Card International Association (PCMCIA) sockets
43 */
44
45 #define PCMCIAPrtSp 0x04000000 /* PCMCIA Partition Space [byte] */
46 #define PCMCIASp (4*PCMCIAPrtSp) /* PCMCIA Space [byte] */
47 #define PCMCIAIOSp PCMCIAPrtSp /* PCMCIA I/O Space [byte] */
48 #define PCMCIAAttrSp PCMCIAPrtSp /* PCMCIA Attribute Space [byte] */
49 #define PCMCIAMemSp PCMCIAPrtSp /* PCMCIA Memory Space [byte] */
50
51 #define PCMCIA0Sp PCMCIASp /* PCMCIA 0 Space [byte] */
52 #define PCMCIA0IOSp PCMCIAIOSp /* PCMCIA 0 I/O Space [byte] */
53 #define PCMCIA0AttrSp PCMCIAAttrSp /* PCMCIA 0 Attribute Space [byte] */
54 #define PCMCIA0MemSp PCMCIAMemSp /* PCMCIA 0 Memory Space [byte] */
55
56 #define PCMCIA1Sp PCMCIASp /* PCMCIA 1 Space [byte] */
57 #define PCMCIA1IOSp PCMCIAIOSp /* PCMCIA 1 I/O Space [byte] */
58 #define PCMCIA1AttrSp PCMCIAAttrSp /* PCMCIA 1 Attribute Space [byte] */
59 #define PCMCIA1MemSp PCMCIAMemSp /* PCMCIA 1 Memory Space [byte] */
60
61 #define _PCMCIA(Nb) /* PCMCIA [0..1] */ \
62 (0x20000000 + (Nb) * PCMCIASp)
63 #define _PCMCIAIO(Nb) _PCMCIA(Nb) /* PCMCIA I/O [0..1] */
64 #define _PCMCIAAttr(Nb) /* PCMCIA Attribute [0..1] */ \
65 (_PCMCIA(Nb) + 2 * PCMCIAPrtSp)
66 #define _PCMCIAMem(Nb) /* PCMCIA Memory [0..1] */ \
67 (_PCMCIA(Nb) + 3 * PCMCIAPrtSp)
68
69 #define _PCMCIA0 _PCMCIA(0) /* PCMCIA 0 */
70 #define _PCMCIA0IO _PCMCIAIO(0) /* PCMCIA 0 I/O */
71 #define _PCMCIA0Attr _PCMCIAAttr(0) /* PCMCIA 0 Attribute */
72 #define _PCMCIA0Mem _PCMCIAMem(0) /* PCMCIA 0 Memory */
73
74 #define _PCMCIA1 _PCMCIA(1) /* PCMCIA 1 */
75 #define _PCMCIA1IO _PCMCIAIO(1) /* PCMCIA 1 I/O */
76 #define _PCMCIA1Attr _PCMCIAAttr(1) /* PCMCIA 1 Attribute */
77 #define _PCMCIA1Mem _PCMCIAMem(1) /* PCMCIA 1 Memory */
78
79
80 #define MCXX_SETUP_MASK (0x7f)
81 #define MCXX_ASST_MASK (0x1f)
82 #define MCXX_HOLD_MASK (0x3f)
83 #define MCXX_SETUP_SHIFT (0)
84 #define MCXX_ASST_SHIFT (7)
85 #define MCXX_HOLD_SHIFT (14)
86
87 static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
88 u_int mem_clk_10khz)
89 {
90 u_int code = pcmcia_cycle_ns * mem_clk_10khz;
91 return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
92 }
93
94 static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
95 u_int mem_clk_10khz)
96 {
97 u_int code = pcmcia_cycle_ns * mem_clk_10khz;
98 return (code / 300000) + ((code % 300000) ? 1 : 0) + 1;
99 }
100
101 static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
102 u_int mem_clk_10khz)
103 {
104 u_int code = pcmcia_cycle_ns * mem_clk_10khz;
105 return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
106 }
107
108 /* This function returns the (approximate) command assertion period, in
109 * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
110 */
111 static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
112 u_int pcmcia_mcxx_asst)
113 {
114 return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
115 }
116
117 static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
118 {
119 MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
120 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
121 | ((pxa2xx_mcxx_asst(speed, clock)
122 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
123 | ((pxa2xx_mcxx_hold(speed, clock)
124 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
125
126 return 0;
127 }
128
129 static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
130 {
131 MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
132 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
133 | ((pxa2xx_mcxx_asst(speed, clock)
134 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
135 | ((pxa2xx_mcxx_hold(speed, clock)
136 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
137
138 return 0;
139 }
140
141 static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
142 {
143 MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
144 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
145 | ((pxa2xx_mcxx_asst(speed, clock)
146 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
147 | ((pxa2xx_mcxx_hold(speed, clock)
148 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
149
150 return 0;
151 }
152
153 static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
154 {
155 struct soc_pcmcia_timing timing;
156 int sock = skt->nr;
157
158 soc_common_pcmcia_get_timing(skt, &timing);
159
160 pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
161 pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
162 pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
163
164 return 0;
165 }
166
167 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
168 {
169 unsigned int clk = get_memclk_frequency_10khz();
170 return pxa2xx_pcmcia_set_mcxx(skt, clk);
171 }
172
173 #ifdef CONFIG_CPU_FREQ
174
175 static int
176 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
177 unsigned long val,
178 struct cpufreq_freqs *freqs)
179 {
180 #warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
181 switch (val) {
182 case CPUFREQ_PRECHANGE:
183 if (freqs->new > freqs->old) {
184 debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
185 "pre-updating\n",
186 freqs->new / 1000, (freqs->new / 100) % 10,
187 freqs->old / 1000, (freqs->old / 100) % 10);
188 pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
189 }
190 break;
191
192 case CPUFREQ_POSTCHANGE:
193 if (freqs->new < freqs->old) {
194 debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
195 "post-updating\n",
196 freqs->new / 1000, (freqs->new / 100) % 10,
197 freqs->old / 1000, (freqs->old / 100) % 10);
198 pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
199 }
200 break;
201 }
202 return 0;
203 }
204 #endif
205
206 static void pxa2xx_configure_sockets(struct device *dev)
207 {
208 struct pcmcia_low_level *ops = dev->platform_data;
209
210 /*
211 * We have at least one socket, so set MECR:CIT
212 * (Card Is There)
213 */
214 MECR |= MECR_CIT;
215
216 /* Set MECR:NOS (Number Of Sockets) */
217 if ((ops->first + ops->nr) > 1 || machine_is_viper())
218 MECR |= MECR_NOS;
219 else
220 MECR &= ~MECR_NOS;
221 }
222
223 static const char *skt_names[] = {
224 "PCMCIA socket 0",
225 "PCMCIA socket 1",
226 };
227
228 #define SKT_DEV_INFO_SIZE(n) \
229 (sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
230
231 int __pxa2xx_drv_pcmcia_probe(struct device *dev)
232 {
233 int i, ret;
234 struct pcmcia_low_level *ops;
235 struct skt_dev_info *sinfo;
236 struct soc_pcmcia_socket *skt;
237
238 if (!dev || !dev->platform_data)
239 return -ENODEV;
240
241 ops = (struct pcmcia_low_level *)dev->platform_data;
242
243 sinfo = kzalloc(SKT_DEV_INFO_SIZE(ops->nr), GFP_KERNEL);
244 if (!sinfo)
245 return -ENOMEM;
246
247 sinfo->nskt = ops->nr;
248
249 /* Initialize processor specific parameters */
250 for (i = 0; i < ops->nr; i++) {
251 skt = &sinfo->skt[i];
252
253 skt->nr = ops->first + i;
254 skt->irq = NO_IRQ;
255
256 skt->res_skt.start = _PCMCIA(skt->nr);
257 skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
258 skt->res_skt.name = skt_names[skt->nr];
259 skt->res_skt.flags = IORESOURCE_MEM;
260
261 skt->res_io.start = _PCMCIAIO(skt->nr);
262 skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
263 skt->res_io.name = "io";
264 skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
265
266 skt->res_mem.start = _PCMCIAMem(skt->nr);
267 skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
268 skt->res_mem.name = "memory";
269 skt->res_mem.flags = IORESOURCE_MEM;
270
271 skt->res_attr.start = _PCMCIAAttr(skt->nr);
272 skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
273 skt->res_attr.name = "attribute";
274 skt->res_attr.flags = IORESOURCE_MEM;
275 }
276
277 /* Provide our PXA2xx specific timing routines. */
278 ops->set_timing = pxa2xx_pcmcia_set_timing;
279 #ifdef CONFIG_CPU_FREQ
280 ops->frequency_change = pxa2xx_pcmcia_frequency_change;
281 #endif
282
283 ret = soc_common_drv_pcmcia_probe(dev, ops, sinfo);
284
285 if (!ret)
286 pxa2xx_configure_sockets(dev);
287
288 return ret;
289 }
290 EXPORT_SYMBOL(__pxa2xx_drv_pcmcia_probe);
291
292
293 static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
294 {
295 return __pxa2xx_drv_pcmcia_probe(&dev->dev);
296 }
297
298 static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
299 {
300 return soc_common_drv_pcmcia_remove(&dev->dev);
301 }
302
303 static int pxa2xx_drv_pcmcia_suspend(struct platform_device *dev, pm_message_t state)
304 {
305 return pcmcia_socket_dev_suspend(&dev->dev, state);
306 }
307
308 static int pxa2xx_drv_pcmcia_resume(struct platform_device *dev)
309 {
310 pxa2xx_configure_sockets(&dev->dev);
311 return pcmcia_socket_dev_resume(&dev->dev);
312 }
313
314 static struct platform_driver pxa2xx_pcmcia_driver = {
315 .probe = pxa2xx_drv_pcmcia_probe,
316 .remove = pxa2xx_drv_pcmcia_remove,
317 .suspend = pxa2xx_drv_pcmcia_suspend,
318 .resume = pxa2xx_drv_pcmcia_resume,
319 .driver = {
320 .name = "pxa2xx-pcmcia",
321 .owner = THIS_MODULE,
322 },
323 };
324
325 static int __init pxa2xx_pcmcia_init(void)
326 {
327 return platform_driver_register(&pxa2xx_pcmcia_driver);
328 }
329
330 static void __exit pxa2xx_pcmcia_exit(void)
331 {
332 platform_driver_unregister(&pxa2xx_pcmcia_driver);
333 }
334
335 fs_initcall(pxa2xx_pcmcia_init);
336 module_exit(pxa2xx_pcmcia_exit);
337
338 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
339 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
340 MODULE_LICENSE("GPL");
341 MODULE_ALIAS("platform:pxa2xx-pcmcia");
Linux kernel - Deliverables
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