xref: /openbmc/linux/drivers/pcmcia/pxa2xx_base.c (revision db66795f) 
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 #include <linux/soc/pxa/cpu.h>
27 #include <linux/soc/pxa/smemc.h>
28 
29 #include <asm/io.h>
30 #include <asm/irq.h>
31 #include <asm/mach-types.h>
32 
33 #include <pcmcia/ss.h>
34 #include <pcmcia/cistpl.h>
35 
36 #include "soc_common.h"
37 #include "pxa2xx_base.h"
38 
39 /*
40  * Personal Computer Memory Card International Association (PCMCIA) sockets
41  */
42 
43 #define PCMCIAPrtSp	0x04000000	/* PCMCIA Partition Space [byte]   */
44 #define PCMCIASp	(4*PCMCIAPrtSp)	/* PCMCIA Space [byte]             */
45 #define PCMCIAIOSp	PCMCIAPrtSp	/* PCMCIA I/O Space [byte]         */
46 #define PCMCIAAttrSp	PCMCIAPrtSp	/* PCMCIA Attribute Space [byte]   */
47 #define PCMCIAMemSp	PCMCIAPrtSp	/* PCMCIA Memory Space [byte]      */
48 
49 #define PCMCIA0Sp	PCMCIASp	/* PCMCIA 0 Space [byte]           */
50 #define PCMCIA0IOSp	PCMCIAIOSp	/* PCMCIA 0 I/O Space [byte]       */
51 #define PCMCIA0AttrSp	PCMCIAAttrSp	/* PCMCIA 0 Attribute Space [byte] */
52 #define PCMCIA0MemSp	PCMCIAMemSp	/* PCMCIA 0 Memory Space [byte]    */
53 
54 #define PCMCIA1Sp	PCMCIASp	/* PCMCIA 1 Space [byte]           */
55 #define PCMCIA1IOSp	PCMCIAIOSp	/* PCMCIA 1 I/O Space [byte]       */
56 #define PCMCIA1AttrSp	PCMCIAAttrSp	/* PCMCIA 1 Attribute Space [byte] */
57 #define PCMCIA1MemSp	PCMCIAMemSp	/* PCMCIA 1 Memory Space [byte]    */
58 
59 #define _PCMCIA(Nb)			/* PCMCIA [0..1]                   */ \
60 			(0x20000000 + (Nb) * PCMCIASp)
61 #define _PCMCIAIO(Nb)	_PCMCIA(Nb)	/* PCMCIA I/O [0..1]               */
62 #define _PCMCIAAttr(Nb)			/* PCMCIA Attribute [0..1]         */ \
63 			(_PCMCIA(Nb) + 2 * PCMCIAPrtSp)
64 #define _PCMCIAMem(Nb)			/* PCMCIA Memory [0..1]            */ \
65 			(_PCMCIA(Nb) + 3 * PCMCIAPrtSp)
66 
67 #define _PCMCIA0	_PCMCIA(0)	/* PCMCIA 0                        */
68 #define _PCMCIA0IO	_PCMCIAIO(0)	/* PCMCIA 0 I/O                    */
69 #define _PCMCIA0Attr	_PCMCIAAttr(0)	/* PCMCIA 0 Attribute              */
70 #define _PCMCIA0Mem	_PCMCIAMem(0)	/* PCMCIA 0 Memory                 */
71 
72 #define _PCMCIA1	_PCMCIA(1)	/* PCMCIA 1                        */
73 #define _PCMCIA1IO	_PCMCIAIO(1)	/* PCMCIA 1 I/O                    */
74 #define _PCMCIA1Attr	_PCMCIAAttr(1)	/* PCMCIA 1 Attribute              */
75 #define _PCMCIA1Mem	_PCMCIAMem(1)	/* PCMCIA 1 Memory                 */
76 
77 
78 #define MCXX_SETUP_MASK     (0x7f)
79 #define MCXX_ASST_MASK      (0x1f)
80 #define MCXX_HOLD_MASK      (0x3f)
81 #define MCXX_SETUP_SHIFT    (0)
82 #define MCXX_ASST_SHIFT     (7)
83 #define MCXX_HOLD_SHIFT     (14)
84 
85 static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
86 				     u_int mem_clk_10khz)
87 {
88 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
89 	return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
90 }
91 
92 static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
93 				     u_int mem_clk_10khz)
94 {
95 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
96 	return (code / 300000) + ((code % 300000) ? 1 : 0) + 1;
97 }
98 
99 static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
100 				      u_int mem_clk_10khz)
101 {
102 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
103 	return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
104 }
105 
106 /* This function returns the (approximate) command assertion period, in
107  * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
108  */
109 static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
110 					   u_int pcmcia_mcxx_asst)
111 {
112 	return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
113 }
114 
115 static uint32_t pxa2xx_pcmcia_mcmem(int sock, int speed, int clock)
116 {
117 	uint32_t val;
118 
119 	val = ((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 val;
127 }
128 
129 static int pxa2xx_pcmcia_mcio(int sock, int speed, int clock)
130 {
131 	uint32_t val;
132 
133 	val = ((pxa2xx_mcxx_setup(speed, clock)
134 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
135 		| ((pxa2xx_mcxx_asst(speed, clock)
136 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
137 		| ((pxa2xx_mcxx_hold(speed, clock)
138 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
139 
140 
141 	return val;
142 }
143 
144 static int pxa2xx_pcmcia_mcatt(int sock, int speed, int clock)
145 {
146 	uint32_t val;
147 
148 	val = ((pxa2xx_mcxx_setup(speed, clock)
149 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
150 		| ((pxa2xx_mcxx_asst(speed, clock)
151 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
152 		| ((pxa2xx_mcxx_hold(speed, clock)
153 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
154 
155 
156 	return val;
157 }
158 
159 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
160 {
161 	unsigned long clk = clk_get_rate(skt->clk) / 10000;
162 	struct soc_pcmcia_timing timing;
163 	int sock = skt->nr;
164 
165 	soc_common_pcmcia_get_timing(skt, &timing);
166 
167 	pxa_smemc_set_pcmcia_timing(sock,
168 		pxa2xx_pcmcia_mcmem(sock, timing.mem, clk),
169 		pxa2xx_pcmcia_mcatt(sock, timing.attr, clk),
170 		pxa2xx_pcmcia_mcio(sock, timing.io, clk));
171 
172 	return 0;
173 }
174 
175 #ifdef CONFIG_CPU_FREQ
176 
177 static int
178 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
179 			       unsigned long val,
180 			       struct cpufreq_freqs *freqs)
181 {
182 	switch (val) {
183 	case CPUFREQ_PRECHANGE:
184 		if (freqs->new > freqs->old) {
185 			debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
186 			       "pre-updating\n",
187 			       freqs->new / 1000, (freqs->new / 100) % 10,
188 			       freqs->old / 1000, (freqs->old / 100) % 10);
189 			pxa2xx_pcmcia_set_timing(skt);
190 		}
191 		break;
192 
193 	case CPUFREQ_POSTCHANGE:
194 		if (freqs->new < freqs->old) {
195 			debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
196 			       "post-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 	return 0;
204 }
205 #endif
206 
207 void pxa2xx_configure_sockets(struct device *dev, struct pcmcia_low_level *ops)
208 {
209 	pxa_smemc_set_pcmcia_socket(1);
210 }
211 EXPORT_SYMBOL(pxa2xx_configure_sockets);
212 
213 static const char *skt_names[] = {
214 	"PCMCIA socket 0",
215 	"PCMCIA socket 1",
216 };
217 
218 #define SKT_DEV_INFO_SIZE(n) \
219 	(sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
220 
221 int pxa2xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
222 {
223 	skt->res_skt.start = _PCMCIA(skt->nr);
224 	skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
225 	skt->res_skt.name = skt_names[skt->nr];
226 	skt->res_skt.flags = IORESOURCE_MEM;
227 
228 	skt->res_io.start = _PCMCIAIO(skt->nr);
229 	skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
230 	skt->res_io.name = "io";
231 	skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
232 
233 	skt->res_mem.start = _PCMCIAMem(skt->nr);
234 	skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
235 	skt->res_mem.name = "memory";
236 	skt->res_mem.flags = IORESOURCE_MEM;
237 
238 	skt->res_attr.start = _PCMCIAAttr(skt->nr);
239 	skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
240 	skt->res_attr.name = "attribute";
241 	skt->res_attr.flags = IORESOURCE_MEM;
242 
243 	return soc_pcmcia_add_one(skt);
244 }
245 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_add_one);
246 
247 void pxa2xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
248 {
249 	/* Provide our PXA2xx specific timing routines. */
250 	ops->set_timing  = pxa2xx_pcmcia_set_timing;
251 #ifdef CONFIG_CPU_FREQ
252 	ops->frequency_change = pxa2xx_pcmcia_frequency_change;
253 #endif
254 }
255 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_ops);
256 
257 static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
258 {
259 	int i, ret = 0;
260 	struct pcmcia_low_level *ops;
261 	struct skt_dev_info *sinfo;
262 	struct soc_pcmcia_socket *skt;
263 	struct clk *clk;
264 
265 	ops = (struct pcmcia_low_level *)dev->dev.platform_data;
266 	if (!ops) {
267 		ret = -ENODEV;
268 		goto err0;
269 	}
270 
271 	if (cpu_is_pxa320() && ops->nr > 1) {
272 		dev_err(&dev->dev, "pxa320 supports only one pcmcia slot");
273 		ret = -EINVAL;
274 		goto err0;
275 	}
276 
277 	clk = devm_clk_get(&dev->dev, NULL);
278 	if (IS_ERR(clk))
279 		return -ENODEV;
280 
281 	pxa2xx_drv_pcmcia_ops(ops);
282 
283 	sinfo = devm_kzalloc(&dev->dev, SKT_DEV_INFO_SIZE(ops->nr),
284 			     GFP_KERNEL);
285 	if (!sinfo)
286 		return -ENOMEM;
287 
288 	sinfo->nskt = ops->nr;
289 
290 	/* Initialize processor specific parameters */
291 	for (i = 0; i < ops->nr; i++) {
292 		skt = &sinfo->skt[i];
293 
294 		skt->nr = ops->first + i;
295 		skt->clk = clk;
296 		soc_pcmcia_init_one(skt, ops, &dev->dev);
297 
298 		ret = pxa2xx_drv_pcmcia_add_one(skt);
299 		if (ret)
300 			goto err1;
301 	}
302 
303 	pxa2xx_configure_sockets(&dev->dev, ops);
304 	dev_set_drvdata(&dev->dev, sinfo);
305 
306 	return 0;
307 
308 err1:
309 	while (--i >= 0)
310 		soc_pcmcia_remove_one(&sinfo->skt[i]);
311 
312 err0:
313 	return ret;
314 }
315 
316 static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
317 {
318 	struct skt_dev_info *sinfo = platform_get_drvdata(dev);
319 	int i;
320 
321 	for (i = 0; i < sinfo->nskt; i++)
322 		soc_pcmcia_remove_one(&sinfo->skt[i]);
323 
324 	return 0;
325 }
326 
327 static int pxa2xx_drv_pcmcia_resume(struct device *dev)
328 {
329 	struct pcmcia_low_level *ops = (struct pcmcia_low_level *)dev->platform_data;
330 
331 	pxa2xx_configure_sockets(dev, ops);
332 	return 0;
333 }
334 
335 static const struct dev_pm_ops pxa2xx_drv_pcmcia_pm_ops = {
336 	.resume		= pxa2xx_drv_pcmcia_resume,
337 };
338 
339 static struct platform_driver pxa2xx_pcmcia_driver = {
340 	.probe		= pxa2xx_drv_pcmcia_probe,
341 	.remove		= pxa2xx_drv_pcmcia_remove,
342 	.driver		= {
343 		.name	= "pxa2xx-pcmcia",
344 		.pm	= &pxa2xx_drv_pcmcia_pm_ops,
345 	},
346 };
347 
348 static int __init pxa2xx_pcmcia_init(void)
349 {
350 	return platform_driver_register(&pxa2xx_pcmcia_driver);
351 }
352 
353 static void __exit pxa2xx_pcmcia_exit(void)
354 {
355 	platform_driver_unregister(&pxa2xx_pcmcia_driver);
356 }
357 
358 fs_initcall(pxa2xx_pcmcia_init);
359 module_exit(pxa2xx_pcmcia_exit);
360 
361 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
362 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
363 MODULE_LICENSE("GPL");
364 MODULE_ALIAS("platform:pxa2xx-pcmcia");
365