1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/pcmcia/pxa2xx_lubbock.c
4 *
5 * Author:	George Davis
6 * Created:	Jan 10, 2002
7 * Copyright:	MontaVista Software Inc.
8 *
9 * Originally based upon linux/drivers/pcmcia/sa1100_neponset.c
10 *
11 * Lubbock PCMCIA specific routines.
12 */
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/device.h>
16#include <linux/errno.h>
17#include <linux/init.h>
18#include <linux/delay.h>
19
20#include <mach/hardware.h>
21#include <asm/hardware/sa1111.h>
22#include <asm/mach-types.h>
23
24#include "sa1111_generic.h"
25#include "max1600.h"
26
27static int lubbock_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
28{
29	struct max1600 *m;
30	int ret;
31
32	ret = max1600_init(skt->socket.dev.parent, &m,
33			   skt->nr ? MAX1600_CHAN_B : MAX1600_CHAN_A,
34			   MAX1600_CODE_HIGH);
35	if (ret == 0)
36		skt->driver_data = m;
37
38	return ret;
39}
40
41static int
42lubbock_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
43				const socket_state_t *state)
44{
45	struct max1600 *m = skt->driver_data;
46	int ret = 0;
47
48	/* Lubbock uses the Maxim MAX1602, with the following connections:
49	 *
50	 * Socket 0 (PCMCIA):
51	 *	MAX1602	Lubbock		Register
52	 *	Pin	Signal
53	 *	-----	-------		----------------------
54	 *	A0VPP	S0_PWR0		SA-1111 GPIO A<0>
55	 *	A1VPP	S0_PWR1		SA-1111 GPIO A<1>
56	 *	A0VCC	S0_PWR2		SA-1111 GPIO A<2>
57	 *	A1VCC	S0_PWR3		SA-1111 GPIO A<3>
58	 *	VX	VCC
59	 *	VY	+3.3V
60	 *	12IN	+12V
61	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
62	 *
63	 * Socket 1 (CF):
64	 *	MAX1602	Lubbock		Register
65	 *	Pin	Signal
66	 *	-----	-------		----------------------
67	 *	A0VPP	GND		VPP is not connected
68	 *	A1VPP	GND		VPP is not connected
69	 *	A0VCC	S1_PWR0		MISC_WR<14>
70	 *	A1VCC	S1_PWR1		MISC_WR<15>
71	 *	VX	VCC
72	 *	VY	+3.3V
73	 *	12IN	GND		VPP is not connected
74	 *	CODE	+3.3V		Cirrus  Code, CODE = High (VY)
75	 *
76	 */
77
78 again:
79	switch (skt->nr) {
80	case 0:
81	case 1:
82		break;
83
84	default:
85		ret = -1;
86	}
87
88	if (ret == 0)
89		ret = sa1111_pcmcia_configure_socket(skt, state);
90	if (ret == 0)
91		ret = max1600_configure(m, state->Vcc, state->Vpp);
92
93#if 1
94	if (ret == 0 && state->Vcc == 33) {
95		struct pcmcia_state new_state;
96
97		/*
98		 * HACK ALERT:
99		 * We can't sense the voltage properly on Lubbock before
100		 * actually applying some power to the socket (catch 22).
101		 * Resense the socket Voltage Sense pins after applying
102		 * socket power.
103		 *
104		 * Note: It takes about 2.5ms for the MAX1602 VCC output
105		 * to rise.
106		 */
107		mdelay(3);
108
109		sa1111_pcmcia_socket_state(skt, &new_state);
110
111		if (!new_state.vs_3v && !new_state.vs_Xv) {
112			/*
113			 * Switch to 5V,  Configure socket with 5V voltage
114			 */
115			max1600_configure(m, 0, 0);
116
117			/*
118			 * It takes about 100ms to turn off Vcc.
119			 */
120			mdelay(100);
121
122			/*
123			 * We need to hack around the const qualifier as
124			 * well to keep this ugly workaround localized and
125			 * not force it to the rest of the code. Barf bags
126			 * available in the seat pocket in front of you!
127			 */
128			((socket_state_t *)state)->Vcc = 50;
129			((socket_state_t *)state)->Vpp = 50;
130			goto again;
131		}
132	}
133#endif
134
135	return ret;
136}
137
138static struct pcmcia_low_level lubbock_pcmcia_ops = {
139	.owner			= THIS_MODULE,
140	.hw_init		= lubbock_pcmcia_hw_init,
141	.configure_socket	= lubbock_pcmcia_configure_socket,
142	.first			= 0,
143	.nr			= 2,
144};
145
146#include "pxa2xx_base.h"
147
148int pcmcia_lubbock_init(struct sa1111_dev *sadev)
149{
150	pxa2xx_drv_pcmcia_ops(&lubbock_pcmcia_ops);
151	pxa2xx_configure_sockets(&sadev->dev, &lubbock_pcmcia_ops);
152	return sa1111_pcmcia_add(sadev, &lubbock_pcmcia_ops,
153				 pxa2xx_drv_pcmcia_add_one);
154}
155
156MODULE_LICENSE("GPL");
157