1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * linux/drivers/pcmcia/pxa2xx_mainstone.c
  4 *
  5 * Mainstone PCMCIA specific routines.
  6 *
  7 * Created:	May 12, 2004
  8 * Author:	Nicolas Pitre
  9 * Copyright:	MontaVista Software Inc.
 10 */
 11#include <linux/gpio/consumer.h>
 12#include <linux/module.h>
 13#include <linux/init.h>
 14#include <linux/interrupt.h>
 15#include <linux/kernel.h>
 16#include <linux/errno.h>
 17#include <linux/platform_device.h>
 18
 19#include <pcmcia/ss.h>
 20
 21#include <asm/mach-types.h>
 22
 23#include "soc_common.h"
 24#include "max1600.h"
 25
 26static int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
 27{
 28	struct device *dev = skt->socket.dev.parent;
 29	struct max1600 *m;
 30	int ret;
 31
 32	skt->stat[SOC_STAT_CD].name = skt->nr ? "bdetect" : "adetect";
 33	skt->stat[SOC_STAT_BVD1].name = skt->nr ? "bbvd1" : "abvd1";
 34	skt->stat[SOC_STAT_BVD2].name = skt->nr ? "bbvd2" : "abvd2";
 35	skt->stat[SOC_STAT_RDY].name = skt->nr ? "bready" : "aready";
 36	skt->stat[SOC_STAT_VS1].name = skt->nr ? "bvs1" : "avs1";
 37	skt->stat[SOC_STAT_VS2].name = skt->nr ? "bvs2" : "avs2";
 38
 39	skt->gpio_reset = devm_gpiod_get(dev, skt->nr ? "breset" : "areset",
 40					 GPIOD_OUT_HIGH);
 41	if (IS_ERR(skt->gpio_reset))
 42		return PTR_ERR(skt->gpio_reset);
 43
 44	ret = max1600_init(dev, &m, skt->nr ? MAX1600_CHAN_B : MAX1600_CHAN_A,
 45			   MAX1600_CODE_HIGH);
 46	if (ret)
 47		return ret;
 48
 49	skt->driver_data = m;
 50
 51	return soc_pcmcia_request_gpiods(skt);
 52}
 53
 54static unsigned int mst_pcmcia_bvd1_status[2];
 55
 56static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
 57				    struct pcmcia_state *state)
 58{
 59	unsigned int flip = mst_pcmcia_bvd1_status[skt->nr] ^ state->bvd1;
 60
 61	/*
 62	 * Workaround for STSCHG which can't be deasserted:
 63	 * We therefore disable/enable corresponding IRQs
 64	 * as needed to avoid IRQ locks.
 65	 */
 66	if (flip) {
 67		mst_pcmcia_bvd1_status[skt->nr] = state->bvd1;
 68		if (state->bvd1)
 69			enable_irq(skt->stat[SOC_STAT_BVD1].irq);
 70		else
 71			disable_irq(skt->stat[SOC_STAT_BVD2].irq);
 72	}
 73}
 74
 75static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 76				       const socket_state_t *state)
 77{
 78	return max1600_configure(skt->driver_data, state->Vcc, state->Vpp);
 79}
 80
 81static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
 82	.owner			= THIS_MODULE,
 83	.hw_init		= mst_pcmcia_hw_init,
 84	.socket_state		= mst_pcmcia_socket_state,
 85	.configure_socket	= mst_pcmcia_configure_socket,
 86	.nr			= 2,
 87};
 88
 89static struct platform_device *mst_pcmcia_device;
 90
 91static int __init mst_pcmcia_init(void)
 92{
 93	int ret;
 94
 95	if (!machine_is_mainstone())
 96		return -ENODEV;
 97
 98	mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 99	if (!mst_pcmcia_device)
100		return -ENOMEM;
101
102	ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
103				       sizeof(mst_pcmcia_ops));
104	if (ret == 0)
105		ret = platform_device_add(mst_pcmcia_device);
106
107	if (ret)
108		platform_device_put(mst_pcmcia_device);
109
110	return ret;
111}
112
113static void __exit mst_pcmcia_exit(void)
114{
115	platform_device_unregister(mst_pcmcia_device);
116}
117
118fs_initcall(mst_pcmcia_init);
119module_exit(mst_pcmcia_exit);
120
121MODULE_LICENSE("GPL");
122MODULE_ALIAS("platform:pxa2xx-pcmcia");