xref: /openbmc/linux/drivers/pcmcia/pxa2xx_base.c (revision 2025cf9e) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*======================================================================
3 
4   Device driver for the PCMCIA control functionality of PXA2xx
5   microprocessors.
6 
7 
8     (c) Ian Molton (spyro@f2s.com) 2003
9     (c) Stefan Eletzhofer (stefan.eletzhofer@inquant.de) 2003,4
10 
11     derived from sa11xx_base.c
12 
13      Portions created by John G. Dorsey are
14      Copyright (C) 1999 John G. Dorsey.
15 
16   ======================================================================*/
17 
18 #include <linux/module.h>
19 #include <linux/slab.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 <mach/smemc.h>
29 #include <asm/io.h>
30 #include <asm/irq.h>
31 #include <mach/pxa2xx-regs.h>
32 #include <asm/mach-types.h>
33 
34 #include <pcmcia/ss.h>
35 #include <pcmcia/cistpl.h>
36 
37 #include "soc_common.h"
38 #include "pxa2xx_base.h"
39 
40 /*
41  * Personal Computer Memory Card International Association (PCMCIA) sockets
42  */
43 
44 #define PCMCIAPrtSp	0x04000000	/* PCMCIA Partition Space [byte]   */
45 #define PCMCIASp	(4*PCMCIAPrtSp)	/* PCMCIA Space [byte]             */
46 #define PCMCIAIOSp	PCMCIAPrtSp	/* PCMCIA I/O Space [byte]         */
47 #define PCMCIAAttrSp	PCMCIAPrtSp	/* PCMCIA Attribute Space [byte]   */
48 #define PCMCIAMemSp	PCMCIAPrtSp	/* PCMCIA Memory Space [byte]      */
49 
50 #define PCMCIA0Sp	PCMCIASp	/* PCMCIA 0 Space [byte]           */
51 #define PCMCIA0IOSp	PCMCIAIOSp	/* PCMCIA 0 I/O Space [byte]       */
52 #define PCMCIA0AttrSp	PCMCIAAttrSp	/* PCMCIA 0 Attribute Space [byte] */
53 #define PCMCIA0MemSp	PCMCIAMemSp	/* PCMCIA 0 Memory Space [byte]    */
54 
55 #define PCMCIA1Sp	PCMCIASp	/* PCMCIA 1 Space [byte]           */
56 #define PCMCIA1IOSp	PCMCIAIOSp	/* PCMCIA 1 I/O Space [byte]       */
57 #define PCMCIA1AttrSp	PCMCIAAttrSp	/* PCMCIA 1 Attribute Space [byte] */
58 #define PCMCIA1MemSp	PCMCIAMemSp	/* PCMCIA 1 Memory Space [byte]    */
59 
60 #define _PCMCIA(Nb)			/* PCMCIA [0..1]                   */ \
61 			(0x20000000 + (Nb) * PCMCIASp)
62 #define _PCMCIAIO(Nb)	_PCMCIA(Nb)	/* PCMCIA I/O [0..1]               */
63 #define _PCMCIAAttr(Nb)			/* PCMCIA Attribute [0..1]         */ \
64 			(_PCMCIA(Nb) + 2 * PCMCIAPrtSp)
65 #define _PCMCIAMem(Nb)			/* PCMCIA Memory [0..1]            */ \
66 			(_PCMCIA(Nb) + 3 * PCMCIAPrtSp)
67 
68 #define _PCMCIA0	_PCMCIA(0)	/* PCMCIA 0                        */
69 #define _PCMCIA0IO	_PCMCIAIO(0)	/* PCMCIA 0 I/O                    */
70 #define _PCMCIA0Attr	_PCMCIAAttr(0)	/* PCMCIA 0 Attribute              */
71 #define _PCMCIA0Mem	_PCMCIAMem(0)	/* PCMCIA 0 Memory                 */
72 
73 #define _PCMCIA1	_PCMCIA(1)	/* PCMCIA 1                        */
74 #define _PCMCIA1IO	_PCMCIAIO(1)	/* PCMCIA 1 I/O                    */
75 #define _PCMCIA1Attr	_PCMCIAAttr(1)	/* PCMCIA 1 Attribute              */
76 #define _PCMCIA1Mem	_PCMCIAMem(1)	/* PCMCIA 1 Memory                 */
77 
78 
79 #define MCXX_SETUP_MASK     (0x7f)
80 #define MCXX_ASST_MASK      (0x1f)
81 #define MCXX_HOLD_MASK      (0x3f)
82 #define MCXX_SETUP_SHIFT    (0)
83 #define MCXX_ASST_SHIFT     (7)
84 #define MCXX_HOLD_SHIFT     (14)
85 
86 static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
87 				     u_int mem_clk_10khz)
88 {
89 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
90 	return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
91 }
92 
93 static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
94 				     u_int mem_clk_10khz)
95 {
96 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
97 	return (code / 300000) + ((code % 300000) ? 1 : 0) + 1;
98 }
99 
100 static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
101 				      u_int mem_clk_10khz)
102 {
103 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
104 	return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
105 }
106 
107 /* This function returns the (approximate) command assertion period, in
108  * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
109  */
110 static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
111 					   u_int pcmcia_mcxx_asst)
112 {
113 	return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
114 }
115 
116 static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
117 {
118 	uint32_t val;
119 
120 	val = ((pxa2xx_mcxx_setup(speed, clock)
121 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
122 		| ((pxa2xx_mcxx_asst(speed, clock)
123 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
124 		| ((pxa2xx_mcxx_hold(speed, clock)
125 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
126 
127 	__raw_writel(val, MCMEM(sock));
128 
129 	return 0;
130 }
131 
132 static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
133 {
134 	uint32_t val;
135 
136 	val = ((pxa2xx_mcxx_setup(speed, clock)
137 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
138 		| ((pxa2xx_mcxx_asst(speed, clock)
139 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
140 		| ((pxa2xx_mcxx_hold(speed, clock)
141 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
142 
143 	__raw_writel(val, MCIO(sock));
144 
145 	return 0;
146 }
147 
148 static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
149 {
150 	uint32_t val;
151 
152 	val = ((pxa2xx_mcxx_setup(speed, clock)
153 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
154 		| ((pxa2xx_mcxx_asst(speed, clock)
155 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
156 		| ((pxa2xx_mcxx_hold(speed, clock)
157 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
158 
159 	__raw_writel(val, MCATT(sock));
160 
161 	return 0;
162 }
163 
164 static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
165 {
166 	struct soc_pcmcia_timing timing;
167 	int sock = skt->nr;
168 
169 	soc_common_pcmcia_get_timing(skt, &timing);
170 
171 	pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
172 	pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
173 	pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
174 
175 	return 0;
176 }
177 
178 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
179 {
180 	unsigned long clk = clk_get_rate(skt->clk);
181 	return pxa2xx_pcmcia_set_mcxx(skt, clk / 10000);
182 }
183 
184 #ifdef CONFIG_CPU_FREQ
185 
186 static int
187 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
188 			       unsigned long val,
189 			       struct cpufreq_freqs *freqs)
190 {
191 	switch (val) {
192 	case CPUFREQ_PRECHANGE:
193 		if (freqs->new > freqs->old) {
194 			debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
195 			       "pre-updating\n",
196 			       freqs->new / 1000, (freqs->new / 100) % 10,
197 			       freqs->old / 1000, (freqs->old / 100) % 10);
198 			pxa2xx_pcmcia_set_timing(skt);
199 		}
200 		break;
201 
202 	case CPUFREQ_POSTCHANGE:
203 		if (freqs->new < freqs->old) {
204 			debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
205 			       "post-updating\n",
206 			       freqs->new / 1000, (freqs->new / 100) % 10,
207 			       freqs->old / 1000, (freqs->old / 100) % 10);
208 			pxa2xx_pcmcia_set_timing(skt);
209 		}
210 		break;
211 	}
212 	return 0;
213 }
214 #endif
215 
216 void pxa2xx_configure_sockets(struct device *dev, struct pcmcia_low_level *ops)
217 {
218 	/*
219 	 * We have at least one socket, so set MECR:CIT
220 	 * (Card Is There)
221 	 */
222 	uint32_t mecr = MECR_CIT;
223 
224 	/* Set MECR:NOS (Number Of Sockets) */
225 	if ((ops->first + ops->nr) > 1 ||
226 	    machine_is_viper() || machine_is_arcom_zeus())
227 		mecr |= MECR_NOS;
228 
229 	__raw_writel(mecr, MECR);
230 }
231 EXPORT_SYMBOL(pxa2xx_configure_sockets);
232 
233 static const char *skt_names[] = {
234 	"PCMCIA socket 0",
235 	"PCMCIA socket 1",
236 };
237 
238 #define SKT_DEV_INFO_SIZE(n) \
239 	(sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
240 
241 int pxa2xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
242 {
243 	skt->res_skt.start = _PCMCIA(skt->nr);
244 	skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
245 	skt->res_skt.name = skt_names[skt->nr];
246 	skt->res_skt.flags = IORESOURCE_MEM;
247 
248 	skt->res_io.start = _PCMCIAIO(skt->nr);
249 	skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
250 	skt->res_io.name = "io";
251 	skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
252 
253 	skt->res_mem.start = _PCMCIAMem(skt->nr);
254 	skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
255 	skt->res_mem.name = "memory";
256 	skt->res_mem.flags = IORESOURCE_MEM;
257 
258 	skt->res_attr.start = _PCMCIAAttr(skt->nr);
259 	skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
260 	skt->res_attr.name = "attribute";
261 	skt->res_attr.flags = IORESOURCE_MEM;
262 
263 	return soc_pcmcia_add_one(skt);
264 }
265 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_add_one);
266 
267 void pxa2xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
268 {
269 	/* Provide our PXA2xx specific timing routines. */
270 	ops->set_timing  = pxa2xx_pcmcia_set_timing;
271 #ifdef CONFIG_CPU_FREQ
272 	ops->frequency_change = pxa2xx_pcmcia_frequency_change;
273 #endif
274 }
275 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_ops);
276 
277 static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
278 {
279 	int i, ret = 0;
280 	struct pcmcia_low_level *ops;
281 	struct skt_dev_info *sinfo;
282 	struct soc_pcmcia_socket *skt;
283 	struct clk *clk;
284 
285 	ops = (struct pcmcia_low_level *)dev->dev.platform_data;
286 	if (!ops) {
287 		ret = -ENODEV;
288 		goto err0;
289 	}
290 
291 	if (cpu_is_pxa320() && ops->nr > 1) {
292 		dev_err(&dev->dev, "pxa320 supports only one pcmcia slot");
293 		ret = -EINVAL;
294 		goto err0;
295 	}
296 
297 	clk = devm_clk_get(&dev->dev, NULL);
298 	if (IS_ERR(clk))
299 		return -ENODEV;
300 
301 	pxa2xx_drv_pcmcia_ops(ops);
302 
303 	sinfo = devm_kzalloc(&dev->dev, SKT_DEV_INFO_SIZE(ops->nr),
304 			     GFP_KERNEL);
305 	if (!sinfo)
306 		return -ENOMEM;
307 
308 	sinfo->nskt = ops->nr;
309 
310 	/* Initialize processor specific parameters */
311 	for (i = 0; i < ops->nr; i++) {
312 		skt = &sinfo->skt[i];
313 
314 		skt->nr = ops->first + i;
315 		skt->clk = clk;
316 		soc_pcmcia_init_one(skt, ops, &dev->dev);
317 
318 		ret = pxa2xx_drv_pcmcia_add_one(skt);
319 		if (ret)
320 			goto err1;
321 	}
322 
323 	pxa2xx_configure_sockets(&dev->dev, ops);
324 	dev_set_drvdata(&dev->dev, sinfo);
325 
326 	return 0;
327 
328 err1:
329 	while (--i >= 0)
330 		soc_pcmcia_remove_one(&sinfo->skt[i]);
331 
332 err0:
333 	return ret;
334 }
335 
336 static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
337 {
338 	struct skt_dev_info *sinfo = platform_get_drvdata(dev);
339 	int i;
340 
341 	for (i = 0; i < sinfo->nskt; i++)
342 		soc_pcmcia_remove_one(&sinfo->skt[i]);
343 
344 	return 0;
345 }
346 
347 static int pxa2xx_drv_pcmcia_resume(struct device *dev)
348 {
349 	struct pcmcia_low_level *ops = (struct pcmcia_low_level *)dev->platform_data;
350 
351 	pxa2xx_configure_sockets(dev, ops);
352 	return 0;
353 }
354 
355 static const struct dev_pm_ops pxa2xx_drv_pcmcia_pm_ops = {
356 	.resume		= pxa2xx_drv_pcmcia_resume,
357 };
358 
359 static struct platform_driver pxa2xx_pcmcia_driver = {
360 	.probe		= pxa2xx_drv_pcmcia_probe,
361 	.remove		= pxa2xx_drv_pcmcia_remove,
362 	.driver		= {
363 		.name	= "pxa2xx-pcmcia",
364 		.pm	= &pxa2xx_drv_pcmcia_pm_ops,
365 	},
366 };
367 
368 static int __init pxa2xx_pcmcia_init(void)
369 {
370 	return platform_driver_register(&pxa2xx_pcmcia_driver);
371 }
372 
373 static void __exit pxa2xx_pcmcia_exit(void)
374 {
375 	platform_driver_unregister(&pxa2xx_pcmcia_driver);
376 }
377 
378 fs_initcall(pxa2xx_pcmcia_init);
379 module_exit(pxa2xx_pcmcia_exit);
380 
381 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
382 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
383 MODULE_LICENSE("GPL");
384 MODULE_ALIAS("platform:pxa2xx-pcmcia");
385