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 <asm/hardware.h>
13#include <asm/mach-types.h>
14#include <asm/arch/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	unsigned int ncr_mask, ncr_set, pa_dwr_mask, pa_dwr_set;
47	int ret;
48
49	switch (skt->nr) {
50	case 0:
51		pa_dwr_mask = GPIO_A0 | GPIO_A1;
52		ncr_mask = NCR_A0VPP | NCR_A1VPP;
53
54		if (state->Vpp == 0)
55			ncr_set = 0;
56		else if (state->Vpp == 120)
57			ncr_set = NCR_A1VPP;
58		else if (state->Vpp == state->Vcc)
59			ncr_set = NCR_A0VPP;
60		else {
61			printk(KERN_ERR "%s(): unrecognized VPP %u\n",
62			       __FUNCTION__, state->Vpp);
63			return -1;
64		}
65		break;
66
67	case 1:
68		pa_dwr_mask = GPIO_A2 | GPIO_A3;
69		ncr_mask = 0;
70		ncr_set = 0;
71
72		if (state->Vpp != state->Vcc && state->Vpp != 0) {
73			printk(KERN_ERR "%s(): CF slot cannot support VPP %u\n",
74			       __FUNCTION__, state->Vpp);
75			return -1;
76		}
77		break;
78
79	default:
80		return -1;
81	}
82
83	/*
84	 * pa_dwr_set is the mask for selecting Vcc on both sockets.
85	 * pa_dwr_mask selects which bits (and therefore socket) we change.
86	 */
87	switch (state->Vcc) {
88	default:
89	case 0:  pa_dwr_set = 0;		break;
90	case 33: pa_dwr_set = GPIO_A1|GPIO_A2;	break;
91	case 50: pa_dwr_set = GPIO_A0|GPIO_A3;	break;
92	}
93
94	ret = sa1111_pcmcia_configure_socket(skt, state);
95	if (ret == 0) {
96		unsigned long flags;
97
98		local_irq_save(flags);
99		NCR_0 = (NCR_0 & ~ncr_mask) | ncr_set;
100
101		local_irq_restore(flags);
102		sa1111_set_io(SA1111_DEV(skt->dev), pa_dwr_mask, pa_dwr_set);
103	}
104
105	return 0;
106}
107
108static void neponset_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
109{
110	if (skt->nr == 0)
111		NCR_0 &= ~(NCR_A0VPP | NCR_A1VPP);
112
113	sa1111_pcmcia_socket_init(skt);
114}
115
116static struct pcmcia_low_level neponset_pcmcia_ops = {
117	.owner			= THIS_MODULE,
118	.hw_init		= sa1111_pcmcia_hw_init,
119	.hw_shutdown		= sa1111_pcmcia_hw_shutdown,
120	.socket_state		= sa1111_pcmcia_socket_state,
121	.configure_socket	= neponset_pcmcia_configure_socket,
122	.socket_init		= neponset_pcmcia_socket_init,
123	.socket_suspend 	= sa1111_pcmcia_socket_suspend,
124};
125
126int __init pcmcia_neponset_init(struct sa1111_dev *sadev)
127{
128	int ret = -ENODEV;
129
130	if (machine_is_assabet()) {
131		/*
132		 * Set GPIO_A<3:0> to be outputs for the MAX1600,
133		 * and switch to standby mode.
134		 */
135		sa1111_set_io_dir(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0, 0);
136		sa1111_set_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
137		sa1111_set_sleep_io(sadev, GPIO_A0|GPIO_A1|GPIO_A2|GPIO_A3, 0);
138		ret = sa11xx_drv_pcmcia_probe(&sadev->dev, &neponset_pcmcia_ops, 0, 2);
139	}
140
141	return ret;
142}
143