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");
123