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
87static 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
94static 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
101static 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 */
111static 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
117static 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
133static 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
149static 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
165static 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
179static 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
187static int
188pxa2xx_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
217void pxa2xx_configure_sockets(struct device *dev)
218{
219	struct pcmcia_low_level *ops = dev->platform_data;
220	/*
221	 * We have at least one socket, so set MECR:CIT
222	 * (Card Is There)
223	 */
224	uint32_t mecr = MECR_CIT;
225
226	/* Set MECR:NOS (Number Of Sockets) */
227	if ((ops->first + ops->nr) > 1 ||
228	    machine_is_viper() || machine_is_arcom_zeus())
229		mecr |= MECR_NOS;
230
231	__raw_writel(mecr, MECR);
232}
233EXPORT_SYMBOL(pxa2xx_configure_sockets);
234
235static const char *skt_names[] = {
236	"PCMCIA socket 0",
237	"PCMCIA socket 1",
238};
239
240#define SKT_DEV_INFO_SIZE(n) \
241	(sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
242
243int pxa2xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
244{
245	skt->res_skt.start = _PCMCIA(skt->nr);
246	skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
247	skt->res_skt.name = skt_names[skt->nr];
248	skt->res_skt.flags = IORESOURCE_MEM;
249
250	skt->res_io.start = _PCMCIAIO(skt->nr);
251	skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
252	skt->res_io.name = "io";
253	skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
254
255	skt->res_mem.start = _PCMCIAMem(skt->nr);
256	skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
257	skt->res_mem.name = "memory";
258	skt->res_mem.flags = IORESOURCE_MEM;
259
260	skt->res_attr.start = _PCMCIAAttr(skt->nr);
261	skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
262	skt->res_attr.name = "attribute";
263	skt->res_attr.flags = IORESOURCE_MEM;
264
265	return soc_pcmcia_add_one(skt);
266}
267EXPORT_SYMBOL(pxa2xx_drv_pcmcia_add_one);
268
269void pxa2xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
270{
271	/* Provide our PXA2xx specific timing routines. */
272	ops->set_timing  = pxa2xx_pcmcia_set_timing;
273#ifdef CONFIG_CPU_FREQ
274	ops->frequency_change = pxa2xx_pcmcia_frequency_change;
275#endif
276}
277EXPORT_SYMBOL(pxa2xx_drv_pcmcia_ops);
278
279static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
280{
281	int i, ret = 0;
282	struct pcmcia_low_level *ops;
283	struct skt_dev_info *sinfo;
284	struct soc_pcmcia_socket *skt;
285	struct clk *clk;
286
287	ops = (struct pcmcia_low_level *)dev->dev.platform_data;
288	if (!ops) {
289		ret = -ENODEV;
290		goto err0;
291	}
292
293	if (cpu_is_pxa320() && ops->nr > 1) {
294		dev_err(&dev->dev, "pxa320 supports only one pcmcia slot");
295		ret = -EINVAL;
296		goto err0;
297	}
298
299	clk = devm_clk_get(&dev->dev, NULL);
300	if (IS_ERR(clk))
301		return -ENODEV;
302
303	pxa2xx_drv_pcmcia_ops(ops);
304
305	sinfo = devm_kzalloc(&dev->dev, SKT_DEV_INFO_SIZE(ops->nr),
306			     GFP_KERNEL);
307	if (!sinfo)
308		return -ENOMEM;
309
310	sinfo->nskt = ops->nr;
311
312	/* Initialize processor specific parameters */
313	for (i = 0; i < ops->nr; i++) {
314		skt = &sinfo->skt[i];
315
316		skt->nr = ops->first + i;
317		skt->clk = clk;
318		soc_pcmcia_init_one(skt, ops, &dev->dev);
319
320		ret = pxa2xx_drv_pcmcia_add_one(skt);
321		if (ret)
322			goto err1;
323	}
324
325	pxa2xx_configure_sockets(&dev->dev);
326	dev_set_drvdata(&dev->dev, sinfo);
327
328	return 0;
329
330err1:
331	while (--i >= 0)
332		soc_pcmcia_remove_one(&sinfo->skt[i]);
333
334err0:
335	return ret;
336}
337
338static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
339{
340	struct skt_dev_info *sinfo = platform_get_drvdata(dev);
341	int i;
342
343	for (i = 0; i < sinfo->nskt; i++)
344		soc_pcmcia_remove_one(&sinfo->skt[i]);
345
346	return 0;
347}
348
349static int pxa2xx_drv_pcmcia_resume(struct device *dev)
350{
351	pxa2xx_configure_sockets(dev);
352	return 0;
353}
354
355static const struct dev_pm_ops pxa2xx_drv_pcmcia_pm_ops = {
356	.resume		= pxa2xx_drv_pcmcia_resume,
357};
358
359static 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
368static int __init pxa2xx_pcmcia_init(void)
369{
370	return platform_driver_register(&pxa2xx_pcmcia_driver);
371}
372
373static void __exit pxa2xx_pcmcia_exit(void)
374{
375	platform_driver_unregister(&pxa2xx_pcmcia_driver);
376}
377
378fs_initcall(pxa2xx_pcmcia_init);
379module_exit(pxa2xx_pcmcia_exit);
380
381MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
382MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
383MODULE_LICENSE("GPL");
384MODULE_ALIAS("platform:pxa2xx-pcmcia");
385