1/*
2 * linux/drivers/pcmcia/pxa2xx_lubbock.c
3 *
4 * Author:	George Davis
5 * Created:	Jan 10, 2002
6 * Copyright:	MontaVista Software Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
13 *
14 * Lubbock PCMCIA specific routines.
15 *
16 */
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/device.h>
20#include <linux/errno.h>
21#include <linux/init.h>
22#include <linux/delay.h>
23
24#include <mach/hardware.h>
25#include <asm/hardware/sa1111.h>
26#include <asm/mach-types.h>
27#include <mach/lubbock.h>
28
29#include "sa1111_generic.h"
30
31static int
32lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
33				const socket_state_t *state)
34{
35	struct sa1111_pcmcia_socket *s = to_skt(skt);
36	unsigned int pa_dwr_mask, pa_dwr_set, misc_mask, misc_set;
37	int ret = 0;
38
39	pa_dwr_mask = pa_dwr_set = misc_mask = misc_set = 0;
40
41	/* Lubbock uses the Maxim MAX1602, with the following connections:
42	 *
43	 * Socket 0 (PCMCIA):
44	 *	MAX1602	Lubbock		Register
45	 *	Pin	Signal
46	 *	-----	-------		----------------------
47	 *	A0VPP	S0_PWR0		SA-1111 GPIO A<0>
48	 *	A1VPP	S0_PWR1		SA-1111 GPIO A<1>
49	 *	A0VCC	S0_PWR2		SA-1111 GPIO A<2>
50	 *	A1VCC	S0_PWR3		SA-1111 GPIO A<3>
51	 *	VX	VCC
52	 *	VY	+3.3V
53	 *	12IN	+12V
54	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
55	 *
56	 * Socket 1 (CF):
57	 *	MAX1602	Lubbock		Register
58	 *	Pin	Signal
59	 *	-----	-------		----------------------
60	 *	A0VPP	GND		VPP is not connected
61	 *	A1VPP	GND		VPP is not connected
62	 *	A0VCC	S1_PWR0		MISC_WR<14>
63	 *	A1VCC	S1_PWR1		MISC_WR<15>
64	 *	VX	VCC
65	 *	VY	+3.3V
66	 *	12IN	GND		VPP is not connected
67	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
68	 *
69	 */
70
71 again:
72	switch (skt->nr) {
73	case 0:
74		pa_dwr_mask = GPIO_A0 | GPIO_A1 | GPIO_A2 | GPIO_A3;
75
76		switch (state->Vcc) {
77		case 0: /* Hi-Z */
78			break;
79
80		case 33: /* VY */
81			pa_dwr_set |= GPIO_A3;
82			break;
83
84		case 50: /* VX */
85			pa_dwr_set |= GPIO_A2;
86			break;
87
88		default:
89			printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
90			       __func__, state->Vcc);
91			ret = -1;
92		}
93
94		switch (state->Vpp) {
95		case 0: /* Hi-Z */
96			break;
97
98		case 120: /* 12IN */
99			pa_dwr_set |= GPIO_A1;
100			break;
101
102		default: /* VCC */
103			if (state->Vpp == state->Vcc)
104				pa_dwr_set |= GPIO_A0;
105			else {
106				printk(KERN_ERR "%s(): unrecognized Vpp %u\n",
107				       __func__, state->Vpp);
108				ret = -1;
109				break;
110			}
111		}
112		break;
113
114	case 1:
115		misc_mask = (1 << 15) | (1 << 14);
116
117		switch (state->Vcc) {
118		case 0: /* Hi-Z */
119			break;
120
121		case 33: /* VY */
122			misc_set |= 1 << 15;
123			break;
124
125		case 50: /* VX */
126			misc_set |= 1 << 14;
127			break;
128
129		default:
130			printk(KERN_ERR "%s(): unrecognized Vcc %u\n",
131			       __func__, state->Vcc);
132			ret = -1;
133			break;
134		}
135
136		if (state->Vpp != state->Vcc && state->Vpp != 0) {
137			printk(KERN_ERR "%s(): CF slot cannot support Vpp %u\n",
138			       __func__, state->Vpp);
139			ret = -1;
140			break;
141		}
142		break;
143
144	default:
145		ret = -1;
146	}
147
148	if (ret == 0)
149		ret = sa1111_pcmcia_configure_socket(skt, state);
150
151	if (ret == 0) {
152		lubbock_set_misc_wr(misc_mask, misc_set);
153		sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
154	}
155
156#if 1
157	if (ret == 0 && state->Vcc == 33) {
158		struct pcmcia_state new_state;
159
160		/*
161		 * HACK ALERT:
162		 * We can't sense the voltage properly on Lubbock before
163		 * actually applying some power to the socket (catch 22).
164		 * Resense the socket Voltage Sense pins after applying
165		 * socket power.
166		 *
167		 * Note: It takes about 2.5ms for the MAX1602 VCC output
168		 * to rise.
169		 */
170		mdelay(3);
171
172		sa1111_pcmcia_socket_state(skt, &new_state);
173
174		if (!new_state.vs_3v && !new_state.vs_Xv) {
175			/*
176			 * Switch to 5V,  Configure socket with 5V voltage
177			 */
178			lubbock_set_misc_wr(misc_mask, 0);
179			sa1111_set_io(s->dev, pa_dwr_mask, 0);
180
181			/*
182			 * It takes about 100ms to turn off Vcc.
183			 */
184			mdelay(100);
185
186			/*
187			 * We need to hack around the const qualifier as
188			 * well to keep this ugly workaround localized and
189			 * not force it to the rest of the code. Barf bags
190			 * available in the seat pocket in front of you!
191			 */
192			((socket_state_t *)state)->Vcc = 50;
193			((socket_state_t *)state)->Vpp = 50;
194			goto again;
195		}
196	}
197#endif
198
199	return ret;
200}
201
202static struct pcmcia_low_level lubbock_pcmcia_ops = {
203	.owner			= THIS_MODULE,
204	.configure_socket	= lubbock_pcmcia_configure_socket,
205	.first			= 0,
206	.nr			= 2,
207};
208
209#include "pxa2xx_base.h"
210
211int pcmcia_lubbock_init(struct sa1111_dev *sadev)
212{
213	int ret = -ENODEV;
214
215	if (machine_is_lubbock()) {
216		/*
217		 * Set GPIO_A<3:0> to be outputs for the MAX1600,
218		 * and switch to standby mode.
219		 */
220		sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
221		sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
222		sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
223
224		/* Set CF Socket 1 power to standby mode. */
225		lubbock_set_misc_wr((1 << 15) | (1 << 14), 0);
226
227		pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
228		pxa2xx_configure_sockets(&sadev->dev);
229		ret = sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
230				pxa2xx_drv_pcmcia_add_one);
231	}
232
233	return ret;
234}
235
236MODULE_LICENSE("GPL");
237