1/*
2 * linux/drivers/pcmcia/sa1100_neponset.c
3 *
4 * Neponset PCMCIA specific routines
5 */
6#include <linux/module.h>
7#include <linux/kernel.h>
8#include <linux/device.h>
9#include <linux/errno.h>
10#include <linux/init.h>
11
12#include <mach/hardware.h>
13#include <asm/mach-types.h>
14#include <mach/neponset.h>
15#include <asm/hardware/sa1111.h>
16
17#include "sa1111_generic.h"
18
19/*
20 * Neponset uses the Maxim MAX1600, with the following connections:
21 *
22 *   MAX1600      Neponset
23 *
24 *    A0VCC        SA-1111 GPIO A<1>
25 *    A1VCC        SA-1111 GPIO A<0>
26 *    A0VPP        CPLD NCR A0VPP
27 *    A1VPP        CPLD NCR A1VPP
28 *    B0VCC        SA-1111 GPIO A<2>
29 *    B1VCC        SA-1111 GPIO A<3>
30 *    B0VPP        ground (slot B is CF)
31 *    B1VPP        ground (slot B is CF)
32 *
33 *     VX          VCC (5V)
34 *     VY          VCC3_3 (3.3V)
35 *     12INA       12V
36 *     12INB       ground (slot B is CF)
37 *
38 * The MAX1600 CODE pin is tied to ground, placing the device in
39 * "Standard Intel code" mode. Refer to the Maxim data sheet for
40 * the corresponding truth table.
41 */
42
43static int
44neponset_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
45{
46	struct sa1111_pcmcia_socket *s = to_skt(skt);
47	unsigned int ncr_mask, ncr_set, pa_dwr_mask, pa_dwr_set;
48	int ret;
49
50	switch (skt->nr) {
51	case 0:
52		pa_dwr_mask = GPIO_A0 | GPIO_A1;
53		ncr_mask = NCR_A0VPP | NCR_A1VPP;
54
55		if (state->Vpp == 0)
56			ncr_set = 0;
57		else if (state->Vpp == 120)
58			ncr_set = NCR_A1VPP;
59		else if (state->Vpp == state->Vcc)
60			ncr_set = NCR_A0VPP;
61		else {
62			printk(KERN_ERR "%s(): unrecognized VPP %u\n",
63			       __func__, state->Vpp);
64			return -1;
65		}
66		break;
67
68	case 1:
69		pa_dwr_mask = GPIO_A2 | GPIO_A3;
70		ncr_mask = 0;
71		ncr_set = 0;
72
73		if (state->Vpp != state->Vcc && state->Vpp != 0) {
74			printk(KERN_ERR "%s(): CF slot cannot support VPP %u\n",
75			       __func__, state->Vpp);
76			return -1;
77		}
78		break;
79
80	default:
81		return -1;
82	}
83
84	/*
85	 * pa_dwr_set is the mask for selecting Vcc on both sockets.
86	 * pa_dwr_mask selects which bits (and therefore socket) we change.
87	 */
88	switch (state->Vcc) {
89	default:
90	case 0:  pa_dwr_set = 0;		break;
91	case 33: pa_dwr_set = GPIO_A1|GPIO_A2;	break;
92	case 50: pa_dwr_set = GPIO_A0|GPIO_A3;	break;
93	}
94
95	ret = sa1111_pcmcia_configure_socket(skt, state);
96	if (ret == 0) {
97		neponset_ncr_frob(ncr_mask, ncr_set);
98		sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
99	}
100
101	return ret;
102}
103
104static struct pcmcia_low_level neponset_pcmcia_ops = {
105	.owner			= THIS_MODULE,
106	.configure_socket	= neponset_pcmcia_configure_socket,
107	.first			= 0,
108	.nr			= 2,
109};
110
111int pcmcia_neponset_init(struct sa1111_dev *sadev)
112{
113	int ret = -ENODEV;
114
115	if (machine_is_assabet()) {
116		/*
117		 * Set GPIO_A<3:0> to be outputs for the MAX1600,
118		 * and switch to standby mode.
119		 */
120		sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
121		sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
122		sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
123		sa11xx_drv_pcmcia_ops(&neponset_pcmcia_ops);
124		ret = sa1111_pcmcia_add(sadev, &neponset_pcmcia_ops,
125				sa11xx_drv_pcmcia_add_one);
126	}
127
128	return ret;
129}
130