xref: /openbmc/linux/drivers/pcmcia/pxa2xx_base.c (revision 82e6fdd6) 
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/slab.h>
21 #include <linux/init.h>
22 #include <linux/cpufreq.h>
23 #include <linux/ioport.h>
24 #include <linux/kernel.h>
25 #include <linux/spinlock.h>
26 #include <linux/platform_device.h>
27 
28 #include <mach/hardware.h>
29 #include <mach/smemc.h>
30 #include <asm/io.h>
31 #include <asm/irq.h>
32 #include <mach/pxa2xx-regs.h>
33 #include <asm/mach-types.h>
34 
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 	uint32_t val;
120 
121 	val = ((pxa2xx_mcxx_setup(speed, clock)
122 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
123 		| ((pxa2xx_mcxx_asst(speed, clock)
124 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
125 		| ((pxa2xx_mcxx_hold(speed, clock)
126 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
127 
128 	__raw_writel(val, MCMEM(sock));
129 
130 	return 0;
131 }
132 
133 static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
134 {
135 	uint32_t val;
136 
137 	val = ((pxa2xx_mcxx_setup(speed, clock)
138 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
139 		| ((pxa2xx_mcxx_asst(speed, clock)
140 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
141 		| ((pxa2xx_mcxx_hold(speed, clock)
142 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
143 
144 	__raw_writel(val, MCIO(sock));
145 
146 	return 0;
147 }
148 
149 static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
150 {
151 	uint32_t val;
152 
153 	val = ((pxa2xx_mcxx_setup(speed, clock)
154 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
155 		| ((pxa2xx_mcxx_asst(speed, clock)
156 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
157 		| ((pxa2xx_mcxx_hold(speed, clock)
158 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
159 
160 	__raw_writel(val, MCATT(sock));
161 
162 	return 0;
163 }
164 
165 static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
166 {
167 	struct soc_pcmcia_timing timing;
168 	int sock = skt->nr;
169 
170 	soc_common_pcmcia_get_timing(skt, &timing);
171 
172 	pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
173 	pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
174 	pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
175 
176 	return 0;
177 }
178 
179 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
180 {
181 	unsigned long clk = clk_get_rate(skt->clk);
182 	return pxa2xx_pcmcia_set_mcxx(skt, clk / 10000);
183 }
184 
185 #ifdef CONFIG_CPU_FREQ
186 
187 static int
188 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
189 			       unsigned long val,
190 			       struct cpufreq_freqs *freqs)
191 {
192 	switch (val) {
193 	case CPUFREQ_PRECHANGE:
194 		if (freqs->new > freqs->old) {
195 			debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
196 			       "pre-updating\n",
197 			       freqs->new / 1000, (freqs->new / 100) % 10,
198 			       freqs->old / 1000, (freqs->old / 100) % 10);
199 			pxa2xx_pcmcia_set_timing(skt);
200 		}
201 		break;
202 
203 	case CPUFREQ_POSTCHANGE:
204 		if (freqs->new < freqs->old) {
205 			debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
206 			       "post-updating\n",
207 			       freqs->new / 1000, (freqs->new / 100) % 10,
208 			       freqs->old / 1000, (freqs->old / 100) % 10);
209 			pxa2xx_pcmcia_set_timing(skt);
210 		}
211 		break;
212 	}
213 	return 0;
214 }
215 #endif
216 
217 void pxa2xx_configure_sockets(struct device *dev, struct pcmcia_low_level *ops)
218 {
219 	/*
220 	 * We have at least one socket, so set MECR:CIT
221 	 * (Card Is There)
222 	 */
223 	uint32_t mecr = MECR_CIT;
224 
225 	/* Set MECR:NOS (Number Of Sockets) */
226 	if ((ops->first + ops->nr) > 1 ||
227 	    machine_is_viper() || machine_is_arcom_zeus())
228 		mecr |= MECR_NOS;
229 
230 	__raw_writel(mecr, MECR);
231 }
232 EXPORT_SYMBOL(pxa2xx_configure_sockets);
233 
234 static const char *skt_names[] = {
235 	"PCMCIA socket 0",
236 	"PCMCIA socket 1",
237 };
238 
239 #define SKT_DEV_INFO_SIZE(n) \
240 	(sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
241 
242 int pxa2xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
243 {
244 	skt->res_skt.start = _PCMCIA(skt->nr);
245 	skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
246 	skt->res_skt.name = skt_names[skt->nr];
247 	skt->res_skt.flags = IORESOURCE_MEM;
248 
249 	skt->res_io.start = _PCMCIAIO(skt->nr);
250 	skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
251 	skt->res_io.name = "io";
252 	skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
253 
254 	skt->res_mem.start = _PCMCIAMem(skt->nr);
255 	skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
256 	skt->res_mem.name = "memory";
257 	skt->res_mem.flags = IORESOURCE_MEM;
258 
259 	skt->res_attr.start = _PCMCIAAttr(skt->nr);
260 	skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
261 	skt->res_attr.name = "attribute";
262 	skt->res_attr.flags = IORESOURCE_MEM;
263 
264 	return soc_pcmcia_add_one(skt);
265 }
266 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_add_one);
267 
268 void pxa2xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
269 {
270 	/* Provide our PXA2xx specific timing routines. */
271 	ops->set_timing  = pxa2xx_pcmcia_set_timing;
272 #ifdef CONFIG_CPU_FREQ
273 	ops->frequency_change = pxa2xx_pcmcia_frequency_change;
274 #endif
275 }
276 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_ops);
277 
278 static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
279 {
280 	int i, ret = 0;
281 	struct pcmcia_low_level *ops;
282 	struct skt_dev_info *sinfo;
283 	struct soc_pcmcia_socket *skt;
284 	struct clk *clk;
285 
286 	ops = (struct pcmcia_low_level *)dev->dev.platform_data;
287 	if (!ops) {
288 		ret = -ENODEV;
289 		goto err0;
290 	}
291 
292 	if (cpu_is_pxa320() && ops->nr > 1) {
293 		dev_err(&dev->dev, "pxa320 supports only one pcmcia slot");
294 		ret = -EINVAL;
295 		goto err0;
296 	}
297 
298 	clk = devm_clk_get(&dev->dev, NULL);
299 	if (IS_ERR(clk))
300 		return -ENODEV;
301 
302 	pxa2xx_drv_pcmcia_ops(ops);
303 
304 	sinfo = devm_kzalloc(&dev->dev, SKT_DEV_INFO_SIZE(ops->nr),
305 			     GFP_KERNEL);
306 	if (!sinfo)
307 		return -ENOMEM;
308 
309 	sinfo->nskt = ops->nr;
310 
311 	/* Initialize processor specific parameters */
312 	for (i = 0; i < ops->nr; i++) {
313 		skt = &sinfo->skt[i];
314 
315 		skt->nr = ops->first + i;
316 		skt->clk = clk;
317 		soc_pcmcia_init_one(skt, ops, &dev->dev);
318 
319 		ret = pxa2xx_drv_pcmcia_add_one(skt);
320 		if (ret)
321 			goto err1;
322 	}
323 
324 	pxa2xx_configure_sockets(&dev->dev, ops);
325 	dev_set_drvdata(&dev->dev, sinfo);
326 
327 	return 0;
328 
329 err1:
330 	while (--i >= 0)
331 		soc_pcmcia_remove_one(&sinfo->skt[i]);
332 
333 err0:
334 	return ret;
335 }
336 
337 static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
338 {
339 	struct skt_dev_info *sinfo = platform_get_drvdata(dev);
340 	int i;
341 
342 	for (i = 0; i < sinfo->nskt; i++)
343 		soc_pcmcia_remove_one(&sinfo->skt[i]);
344 
345 	return 0;
346 }
347 
348 static int pxa2xx_drv_pcmcia_resume(struct device *dev)
349 {
350 	struct pcmcia_low_level *ops = (struct pcmcia_low_level *)dev->platform_data;
351 
352 	pxa2xx_configure_sockets(dev, ops);
353 	return 0;
354 }
355 
356 static const struct dev_pm_ops pxa2xx_drv_pcmcia_pm_ops = {
357 	.resume		= pxa2xx_drv_pcmcia_resume,
358 };
359 
360 static struct platform_driver pxa2xx_pcmcia_driver = {
361 	.probe		= pxa2xx_drv_pcmcia_probe,
362 	.remove		= pxa2xx_drv_pcmcia_remove,
363 	.driver		= {
364 		.name	= "pxa2xx-pcmcia",
365 		.pm	= &pxa2xx_drv_pcmcia_pm_ops,
366 	},
367 };
368 
369 static int __init pxa2xx_pcmcia_init(void)
370 {
371 	return platform_driver_register(&pxa2xx_pcmcia_driver);
372 }
373 
374 static void __exit pxa2xx_pcmcia_exit(void)
375 {
376 	platform_driver_unregister(&pxa2xx_pcmcia_driver);
377 }
378 
379 fs_initcall(pxa2xx_pcmcia_init);
380 module_exit(pxa2xx_pcmcia_exit);
381 
382 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
383 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
384 MODULE_LICENSE("GPL");
385 MODULE_ALIAS("platform:pxa2xx-pcmcia");
386