xref: /openbmc/linux/drivers/pcmcia/pxa2xx_base.c (revision 5742964e) 
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 #define MCXX_SETUP_MASK     (0x7f)
43 #define MCXX_ASST_MASK      (0x1f)
44 #define MCXX_HOLD_MASK      (0x3f)
45 #define MCXX_SETUP_SHIFT    (0)
46 #define MCXX_ASST_SHIFT     (7)
47 #define MCXX_HOLD_SHIFT     (14)
48 
49 static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
50 				     u_int mem_clk_10khz)
51 {
52 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
53 	return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
54 }
55 
56 static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
57 				     u_int mem_clk_10khz)
58 {
59 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
60 	return (code / 300000) + ((code % 300000) ? 1 : 0) + 1;
61 }
62 
63 static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
64 				      u_int mem_clk_10khz)
65 {
66 	u_int code = pcmcia_cycle_ns * mem_clk_10khz;
67 	return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
68 }
69 
70 /* This function returns the (approximate) command assertion period, in
71  * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
72  */
73 static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
74 					   u_int pcmcia_mcxx_asst)
75 {
76 	return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
77 }
78 
79 static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
80 {
81 	MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
82 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
83 		| ((pxa2xx_mcxx_asst(speed, clock)
84 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
85 		| ((pxa2xx_mcxx_hold(speed, clock)
86 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
87 
88 	return 0;
89 }
90 
91 static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
92 {
93 	MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
94 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
95 		| ((pxa2xx_mcxx_asst(speed, clock)
96 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
97 		| ((pxa2xx_mcxx_hold(speed, clock)
98 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
99 
100 	return 0;
101 }
102 
103 static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
104 {
105 	MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
106 		& MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
107 		| ((pxa2xx_mcxx_asst(speed, clock)
108 		& MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
109 		| ((pxa2xx_mcxx_hold(speed, clock)
110 		& MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
111 
112 	return 0;
113 }
114 
115 static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
116 {
117 	struct soc_pcmcia_timing timing;
118 	int sock = skt->nr;
119 
120 	soc_common_pcmcia_get_timing(skt, &timing);
121 
122 	pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
123 	pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
124 	pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
125 
126 	return 0;
127 }
128 
129 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
130 {
131 	unsigned int clk = get_memclk_frequency_10khz();
132 	return pxa2xx_pcmcia_set_mcxx(skt, clk);
133 }
134 
135 #ifdef CONFIG_CPU_FREQ
136 
137 static int
138 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
139 			       unsigned long val,
140 			       struct cpufreq_freqs *freqs)
141 {
142 #warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
143 	switch (val) {
144 	case CPUFREQ_PRECHANGE:
145 		if (freqs->new > freqs->old) {
146 			debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
147 			       "pre-updating\n",
148 			       freqs->new / 1000, (freqs->new / 100) % 10,
149 			       freqs->old / 1000, (freqs->old / 100) % 10);
150 			pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
151 		}
152 		break;
153 
154 	case CPUFREQ_POSTCHANGE:
155 		if (freqs->new < freqs->old) {
156 			debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
157 			       "post-updating\n",
158 			       freqs->new / 1000, (freqs->new / 100) % 10,
159 			       freqs->old / 1000, (freqs->old / 100) % 10);
160 			pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
161 		}
162 		break;
163 	}
164 	return 0;
165 }
166 #endif
167 
168 static void pxa2xx_configure_sockets(struct device *dev)
169 {
170 	struct pcmcia_low_level *ops = dev->platform_data;
171 
172 	/*
173 	 * We have at least one socket, so set MECR:CIT
174 	 * (Card Is There)
175 	 */
176 	MECR |= MECR_CIT;
177 
178 	/* Set MECR:NOS (Number Of Sockets) */
179 	if (ops->nr > 1 || machine_is_viper())
180 		MECR |= MECR_NOS;
181 	else
182 		MECR &= ~MECR_NOS;
183 }
184 
185 int __pxa2xx_drv_pcmcia_probe(struct device *dev)
186 {
187 	int ret;
188 	struct pcmcia_low_level *ops;
189 
190 	if (!dev || !dev->platform_data)
191 		return -ENODEV;
192 
193 	ops = (struct pcmcia_low_level *)dev->platform_data;
194 
195 	/* Provide our PXA2xx specific timing routines. */
196 	ops->set_timing  = pxa2xx_pcmcia_set_timing;
197 #ifdef CONFIG_CPU_FREQ
198 	ops->frequency_change = pxa2xx_pcmcia_frequency_change;
199 #endif
200 
201 	ret = soc_common_drv_pcmcia_probe(dev, ops, ops->first, ops->nr);
202 
203 	if (!ret)
204 		pxa2xx_configure_sockets(dev);
205 
206 	return ret;
207 }
208 EXPORT_SYMBOL(__pxa2xx_drv_pcmcia_probe);
209 
210 
211 static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
212 {
213 	return __pxa2xx_drv_pcmcia_probe(&dev->dev);
214 }
215 
216 static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
217 {
218 	return soc_common_drv_pcmcia_remove(&dev->dev);
219 }
220 
221 static int pxa2xx_drv_pcmcia_suspend(struct platform_device *dev, pm_message_t state)
222 {
223 	return pcmcia_socket_dev_suspend(&dev->dev, state);
224 }
225 
226 static int pxa2xx_drv_pcmcia_resume(struct platform_device *dev)
227 {
228 	pxa2xx_configure_sockets(&dev->dev);
229 	return pcmcia_socket_dev_resume(&dev->dev);
230 }
231 
232 static struct platform_driver pxa2xx_pcmcia_driver = {
233 	.probe		= pxa2xx_drv_pcmcia_probe,
234 	.remove		= pxa2xx_drv_pcmcia_remove,
235 	.suspend 	= pxa2xx_drv_pcmcia_suspend,
236 	.resume 	= pxa2xx_drv_pcmcia_resume,
237 	.driver		= {
238 		.name	= "pxa2xx-pcmcia",
239 		.owner	= THIS_MODULE,
240 	},
241 };
242 
243 static int __init pxa2xx_pcmcia_init(void)
244 {
245 	return platform_driver_register(&pxa2xx_pcmcia_driver);
246 }
247 
248 static void __exit pxa2xx_pcmcia_exit(void)
249 {
250 	platform_driver_unregister(&pxa2xx_pcmcia_driver);
251 }
252 
253 fs_initcall(pxa2xx_pcmcia_init);
254 module_exit(pxa2xx_pcmcia_exit);
255 
256 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
257 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
258 MODULE_LICENSE("GPL");
259 MODULE_ALIAS("platform:pxa2xx-pcmcia");
260