1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * PCMCIA socket code for the MyCable XXS1500 system.
4 *
5 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
6 *
7 */
8
9#include <linux/delay.h>
10#include <linux/gpio.h>
11#include <linux/interrupt.h>
12#include <linux/io.h>
13#include <linux/ioport.h>
14#include <linux/mm.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/pm.h>
18#include <linux/resource.h>
19#include <linux/slab.h>
20#include <linux/spinlock.h>
21
22#include <pcmcia/ss.h>
23#include <pcmcia/cistpl.h>
24
25#include <asm/irq.h>
26#include <asm/mach-au1x00/au1000.h>
27
28#define MEM_MAP_SIZE	0x400000
29#define IO_MAP_SIZE	0x1000
30
31
32/*
33 * 3.3V cards only; all interfacing is done via gpios:
34 *
35 * 0/1:  carddetect (00 = card present, xx = huh)
36 * 4:	 card irq
37 * 204:  reset (high-act)
38 * 205:  buffer enable (low-act)
39 * 208/209: card voltage key (00,01,10,11)
40 * 210:  battwarn
41 * 211:  batdead
42 * 214:  power (low-act)
43 */
44#define GPIO_CDA	0
45#define GPIO_CDB	1
46#define GPIO_CARDIRQ	4
47#define GPIO_RESET	204
48#define GPIO_OUTEN	205
49#define GPIO_VSL	208
50#define GPIO_VSH	209
51#define GPIO_BATTDEAD	210
52#define GPIO_BATTWARN	211
53#define GPIO_POWER	214
54
55struct xxs1500_pcmcia_sock {
56	struct pcmcia_socket	socket;
57	void		*virt_io;
58
59	phys_addr_t	phys_io;
60	phys_addr_t	phys_attr;
61	phys_addr_t	phys_mem;
62
63	/* previous flags for set_socket() */
64	unsigned int old_flags;
65};
66
67#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)
68
69static irqreturn_t cdirq(int irq, void *data)
70{
71	struct xxs1500_pcmcia_sock *sock = data;
72
73	pcmcia_parse_events(&sock->socket, SS_DETECT);
74
75	return IRQ_HANDLED;
76}
77
78static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
79				    struct socket_state_t *state)
80{
81	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
82	unsigned int changed;
83
84	/* power control */
85	switch (state->Vcc) {
86	case 0:
87		gpio_set_value(GPIO_POWER, 1);	/* power off */
88		break;
89	case 33:
90		gpio_set_value(GPIO_POWER, 0);	/* power on */
91		break;
92	case 50:
93	default:
94		return -EINVAL;
95	}
96
97	changed = state->flags ^ sock->old_flags;
98
99	if (changed & SS_RESET) {
100		if (state->flags & SS_RESET) {
101			gpio_set_value(GPIO_RESET, 1);	/* assert reset */
102			gpio_set_value(GPIO_OUTEN, 1);	/* buffers off */
103		} else {
104			gpio_set_value(GPIO_RESET, 0);	/* deassert reset */
105			gpio_set_value(GPIO_OUTEN, 0);	/* buffers on */
106			msleep(500);
107		}
108	}
109
110	sock->old_flags = state->flags;
111
112	return 0;
113}
114
115static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
116				     unsigned int *value)
117{
118	unsigned int status;
119	int i;
120
121	status = 0;
122
123	/* check carddetects: GPIO[0:1] must both be low */
124	if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
125		status |= SS_DETECT;
126
127	/* determine card voltage: GPIO[208:209] binary value */
128	i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);
129
130	switch (i) {
131	case 0:
132	case 1:
133	case 2:
134		status |= SS_3VCARD;	/* 3V card */
135		break;
136	case 3:				/* 5V card, unsupported */
137	default:
138		status |= SS_XVCARD;	/* treated as unsupported in core */
139	}
140
141	/* GPIO214: low active power switch */
142	status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;
143
144	/* GPIO204: high-active reset line */
145	status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;
146
147	/* other stuff */
148	status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
149	status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;
150
151	*value = status;
152
153	return 0;
154}
155
156static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
157{
158	gpio_direction_input(GPIO_CDA);
159	gpio_direction_input(GPIO_CDB);
160	gpio_direction_input(GPIO_VSL);
161	gpio_direction_input(GPIO_VSH);
162	gpio_direction_input(GPIO_BATTDEAD);
163	gpio_direction_input(GPIO_BATTWARN);
164	gpio_direction_output(GPIO_RESET, 1);	/* assert reset */
165	gpio_direction_output(GPIO_OUTEN, 1);	/* disable buffers */
166	gpio_direction_output(GPIO_POWER, 1);	/* power off */
167
168	return 0;
169}
170
171static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
172{
173	return 0;
174}
175
176static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
177				    struct pccard_io_map *map)
178{
179	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
180
181	map->start = (u32)sock->virt_io;
182	map->stop = map->start + IO_MAP_SIZE;
183
184	return 0;
185}
186
187static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
188				     struct pccard_mem_map *map)
189{
190	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
191
192	if (map->flags & MAP_ATTRIB)
193		map->static_start = sock->phys_attr + map->card_start;
194	else
195		map->static_start = sock->phys_mem + map->card_start;
196
197	return 0;
198}
199
200static struct pccard_operations xxs1500_pcmcia_operations = {
201	.init			= xxs1500_pcmcia_sock_init,
202	.suspend		= xxs1500_pcmcia_sock_suspend,
203	.get_status		= xxs1500_pcmcia_get_status,
204	.set_socket		= xxs1500_pcmcia_configure,
205	.set_io_map		= au1x00_pcmcia_set_io_map,
206	.set_mem_map		= au1x00_pcmcia_set_mem_map,
207};
208
209static int xxs1500_pcmcia_probe(struct platform_device *pdev)
210{
211	struct xxs1500_pcmcia_sock *sock;
212	struct resource *r;
213	int ret, irq;
214
215	sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
216	if (!sock)
217		return -ENOMEM;
218
219	ret = -ENODEV;
220
221	/* 36bit PCMCIA Attribute area address */
222	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
223	if (!r) {
224		dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n");
225		goto out0;
226	}
227	sock->phys_attr = r->start;
228
229	/* 36bit PCMCIA Memory area address */
230	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
231	if (!r) {
232		dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n");
233		goto out0;
234	}
235	sock->phys_mem = r->start;
236
237	/* 36bit PCMCIA IO area address */
238	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
239	if (!r) {
240		dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n");
241		goto out0;
242	}
243	sock->phys_io = r->start;
244
245
246	/*
247	 * PCMCIA client drivers use the inb/outb macros to access
248	 * the IO registers.  Since mips_io_port_base is added
249	 * to the access address of the mips implementation of
250	 * inb/outb, we need to subtract it here because we want
251	 * to access the I/O or MEM address directly, without
252	 * going through this "mips_io_port_base" mechanism.
253	 */
254	sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
255				 mips_io_port_base);
256
257	if (!sock->virt_io) {
258		dev_err(&pdev->dev, "cannot remap IO area\n");
259		ret = -ENOMEM;
260		goto out0;
261	}
262
263	sock->socket.ops	= &xxs1500_pcmcia_operations;
264	sock->socket.owner	= THIS_MODULE;
265	sock->socket.pci_irq	= gpio_to_irq(GPIO_CARDIRQ);
266	sock->socket.features	= SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
267	sock->socket.map_size	= MEM_MAP_SIZE;
268	sock->socket.io_offset	= (unsigned long)sock->virt_io;
269	sock->socket.dev.parent	= &pdev->dev;
270	sock->socket.resource_ops = &pccard_static_ops;
271
272	platform_set_drvdata(pdev, sock);
273
274	/* setup carddetect irq: use one of the 2 GPIOs as an
275	 * edge detector.
276	 */
277	irq = gpio_to_irq(GPIO_CDA);
278	irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
279	ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
280	if (ret) {
281		dev_err(&pdev->dev, "cannot setup cd irq\n");
282		goto out1;
283	}
284
285	ret = pcmcia_register_socket(&sock->socket);
286	if (ret) {
287		dev_err(&pdev->dev, "failed to register\n");
288		goto out2;
289	}
290
291	printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");
292
293	return 0;
294
295out2:
296	free_irq(gpio_to_irq(GPIO_CDA), sock);
297out1:
298	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
299out0:
300	kfree(sock);
301	return ret;
302}
303
304static void xxs1500_pcmcia_remove(struct platform_device *pdev)
305{
306	struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);
307
308	pcmcia_unregister_socket(&sock->socket);
309	free_irq(gpio_to_irq(GPIO_CDA), sock);
310	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
311	kfree(sock);
312}
313
314static struct platform_driver xxs1500_pcmcia_socket_driver = {
315	.driver	= {
316		.name	= "xxs1500_pcmcia",
317	},
318	.probe		= xxs1500_pcmcia_probe,
319	.remove_new	= xxs1500_pcmcia_remove,
320};
321
322module_platform_driver(xxs1500_pcmcia_socket_driver);
323
324MODULE_LICENSE("GPL");
325MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
326MODULE_AUTHOR("Manuel Lauss");
327