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}