1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * drivers/pcmcia/sa1100_jornada720.c
  4 *
  5 * Jornada720 PCMCIA specific routines
  6 *
  7 */
  8#include <linux/module.h>
  9#include <linux/device.h>
 10#include <linux/errno.h>
 11#include <linux/gpio/consumer.h>
 12#include <linux/init.h>
 13#include <linux/io.h>
 14
 15#include <mach/hardware.h>
 16#include <asm/mach-types.h>
 17
 18#include "sa1111_generic.h"
 19
 20/*
 21 * Socket 0 power: GPIO A0
 22 * Socket 0 3V: GPIO A2
 23 * Socket 1 power: GPIO A1 & GPIO A3
 24 * Socket 1 3V: GPIO A3
 25 * Does Socket 1 3V actually do anything?
 26 */
 27enum {
 28	J720_GPIO_PWR,
 29	J720_GPIO_3V,
 30	J720_GPIO_MAX,
 31};
 32struct jornada720_data {
 33	struct gpio_desc *gpio[J720_GPIO_MAX];
 34};
 35
 36static int jornada720_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
 37{
 38	struct device *dev = skt->socket.dev.parent;
 39	struct jornada720_data *j;
 40
 41	j = devm_kzalloc(dev, sizeof(*j), GFP_KERNEL);
 42	if (!j)
 43		return -ENOMEM;
 44
 45	j->gpio[J720_GPIO_PWR] = devm_gpiod_get(dev, skt->nr ? "s1-power" :
 46						"s0-power", GPIOD_OUT_LOW);
 47	if (IS_ERR(j->gpio[J720_GPIO_PWR]))
 48		return PTR_ERR(j->gpio[J720_GPIO_PWR]);
 49
 50	j->gpio[J720_GPIO_3V] = devm_gpiod_get(dev, skt->nr ? "s1-3v" :
 51					       "s0-3v", GPIOD_OUT_LOW);
 52	if (IS_ERR(j->gpio[J720_GPIO_3V]))
 53		return PTR_ERR(j->gpio[J720_GPIO_3V]);
 54
 55	skt->driver_data = j;
 56
 57	return 0;
 58}
 59
 60static int
 61jornada720_pcmcia_configure_socket(struct soc_pcmcia_socket *skt, const socket_state_t *state)
 62{
 63	struct jornada720_data *j = skt->driver_data;
 64	DECLARE_BITMAP(values, J720_GPIO_MAX) = { 0, };
 65	int ret;
 66
 67	printk(KERN_INFO "%s(): config socket %d vcc %d vpp %d\n", __func__,
 68		skt->nr, state->Vcc, state->Vpp);
 69
 70	switch (skt->nr) {
 71	case 0:
 72		switch (state->Vcc) {
 73		default:
 74		case  0:
 75			__assign_bit(J720_GPIO_PWR, values, 0);
 76			__assign_bit(J720_GPIO_3V, values, 0);
 77			break;
 78		case 33:
 79			__assign_bit(J720_GPIO_PWR, values, 1);
 80			__assign_bit(J720_GPIO_3V, values, 1);
 81			break;
 82		case 50:
 83			__assign_bit(J720_GPIO_PWR, values, 1);
 84			__assign_bit(J720_GPIO_3V, values, 0);
 85			break;
 86		}
 87		break;
 88
 89	case 1:
 90		switch (state->Vcc) {
 91		default:
 92		case 0:
 93			__assign_bit(J720_GPIO_PWR, values, 0);
 94			__assign_bit(J720_GPIO_3V, values, 0);
 95			break;
 96		case 33:
 97		case 50:
 98			__assign_bit(J720_GPIO_PWR, values, 1);
 99			__assign_bit(J720_GPIO_3V, values, 1);
100			break;
101		}
102		break;
103
104	default:
105		return -1;
106	}
107
108	if (state->Vpp != state->Vcc && state->Vpp != 0) {
109		printk(KERN_ERR "%s(): slot cannot support VPP %u\n",
110			__func__, state->Vpp);
111		return -EPERM;
112	}
113
114	ret = sa1111_pcmcia_configure_socket(skt, state);
115	if (ret == 0)
116		ret = gpiod_set_array_value_cansleep(J720_GPIO_MAX, j->gpio,
117						     NULL, values);
118
119	return ret;
120}
121
122static struct pcmcia_low_level jornada720_pcmcia_ops = {
123	.owner			= THIS_MODULE,
124	.hw_init		= jornada720_pcmcia_hw_init,
125	.configure_socket	= jornada720_pcmcia_configure_socket,
126	.first			= 0,
127	.nr			= 2,
128};
129
130int pcmcia_jornada720_init(struct sa1111_dev *sadev)
131{
132	/* Fixme: why messing around with SA11x0's GPIO1? */
133	GRER |= 0x00000002;
134
135	sa11xx_drv_pcmcia_ops(&jornada720_pcmcia_ops);
136	return sa1111_pcmcia_add(sadev, &jornada720_pcmcia_ops,
137				 sa11xx_drv_pcmcia_add_one);
138}