Root/drivers/pcmcia/sa1100_neponset.c

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        unsigned long flags;
98
99        local_irq_save(flags);
100        NCR_0 = (NCR_0 & ~ncr_mask) | ncr_set;
101
102        local_irq_restore(flags);
103        sa1111_set_io(s->dev, pa_dwr_mask, pa_dwr_set);
104    }
105
106    return 0;
107}
108
109static void neponset_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
110{
111    if (skt->nr == 0)
112        NCR_0 &= ~(NCR_A0VPP | NCR_A1VPP);
113
114    sa1111_pcmcia_socket_init(skt);
115}
116
117static struct pcmcia_low_level neponset_pcmcia_ops = {
118    .owner = THIS_MODULE,
119    .configure_socket = neponset_pcmcia_configure_socket,
120    .socket_init = neponset_pcmcia_socket_init,
121    .first = 0,
122    .nr = 2,
123};
124
125int pcmcia_neponset_init(struct sa1111_dev *sadev)
126{
127    int ret = -ENODEV;
128
129    if (machine_is_assabet()) {
130        /*
131         * Set GPIO_A<3:0> to be outputs for the MAX1600,
132         * and switch to standby mode.
133         */
134        sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
135        sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
136        sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
137        sa11xx_drv_pcmcia_ops(&neponset_pcmcia_ops);
138        ret = sa1111_pcmcia_add(sadev, &neponset_pcmcia_ops,
139                sa11xx_drv_pcmcia_add_one);
140    }
141
142    return ret;
143}
144

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