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sa1111_lubbock.c
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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 
31 static int
32 lubbock_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 
202 static 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 
211 int 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 
236 MODULE_LICENSE("GPL");
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