1/*
2 * PCMCIA socket code for the MyCable XXS1500 system.
3 *
4 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com>
5 *
6 */
7
8#include <linux/delay.h>
9#include <linux/gpio.h>
10#include <linux/interrupt.h>
11#include <linux/io.h>
12#include <linux/ioport.h>
13#include <linux/mm.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/pm.h>
17#include <linux/resource.h>
18#include <linux/slab.h>
19#include <linux/spinlock.h>
20
21#include <pcmcia/ss.h>
22#include <pcmcia/cistpl.h>
23
24#include <asm/irq.h>
25#include <asm/mach-au1x00/au1000.h>
26
27#define MEM_MAP_SIZE	0x400000
28#define IO_MAP_SIZE	0x1000
29
30
31/*
32 * 3.3V cards only; all interfacing is done via gpios:
33 *
34 * 0/1:  carddetect (00 = card present, xx = huh)
35 * 4:	 card irq
36 * 204:  reset (high-act)
37 * 205:  buffer enable (low-act)
38 * 208/209: card voltage key (00,01,10,11)
39 * 210:  battwarn
40 * 211:  batdead
41 * 214:  power (low-act)
42 */
43#define GPIO_CDA	0
44#define GPIO_CDB	1
45#define GPIO_CARDIRQ	4
46#define GPIO_RESET	204
47#define GPIO_OUTEN	205
48#define GPIO_VSL	208
49#define GPIO_VSH	209
50#define GPIO_BATTDEAD	210
51#define GPIO_BATTWARN	211
52#define GPIO_POWER	214
53
54struct xxs1500_pcmcia_sock {
55	struct pcmcia_socket	socket;
56	void		*virt_io;
57
58	phys_addr_t	phys_io;
59	phys_addr_t	phys_attr;
60	phys_addr_t	phys_mem;
61
62	/* previous flags for set_socket() */
63	unsigned int old_flags;
64};
65
66#define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket)
67
68static irqreturn_t cdirq(int irq, void *data)
69{
70	struct xxs1500_pcmcia_sock *sock = data;
71
72	pcmcia_parse_events(&sock->socket, SS_DETECT);
73
74	return IRQ_HANDLED;
75}
76
77static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt,
78				    struct socket_state_t *state)
79{
80	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
81	unsigned int changed;
82
83	/* power control */
84	switch (state->Vcc) {
85	case 0:
86		gpio_set_value(GPIO_POWER, 1);	/* power off */
87		break;
88	case 33:
89		gpio_set_value(GPIO_POWER, 0);	/* power on */
90		break;
91	case 50:
92	default:
93		return -EINVAL;
94	}
95
96	changed = state->flags ^ sock->old_flags;
97
98	if (changed & SS_RESET) {
99		if (state->flags & SS_RESET) {
100			gpio_set_value(GPIO_RESET, 1);	/* assert reset */
101			gpio_set_value(GPIO_OUTEN, 1);	/* buffers off */
102		} else {
103			gpio_set_value(GPIO_RESET, 0);	/* deassert reset */
104			gpio_set_value(GPIO_OUTEN, 0);	/* buffers on */
105			msleep(500);
106		}
107	}
108
109	sock->old_flags = state->flags;
110
111	return 0;
112}
113
114static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt,
115				     unsigned int *value)
116{
117	unsigned int status;
118	int i;
119
120	status = 0;
121
122	/* check carddetects: GPIO[0:1] must both be low */
123	if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB))
124		status |= SS_DETECT;
125
126	/* determine card voltage: GPIO[208:209] binary value */
127	i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1);
128
129	switch (i) {
130	case 0:
131	case 1:
132	case 2:
133		status |= SS_3VCARD;	/* 3V card */
134		break;
135	case 3:				/* 5V card, unsupported */
136	default:
137		status |= SS_XVCARD;	/* treated as unsupported in core */
138	}
139
140	/* GPIO214: low active power switch */
141	status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON;
142
143	/* GPIO204: high-active reset line */
144	status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY;
145
146	/* other stuff */
147	status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD;
148	status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN;
149
150	*value = status;
151
152	return 0;
153}
154
155static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt)
156{
157	gpio_direction_input(GPIO_CDA);
158	gpio_direction_input(GPIO_CDB);
159	gpio_direction_input(GPIO_VSL);
160	gpio_direction_input(GPIO_VSH);
161	gpio_direction_input(GPIO_BATTDEAD);
162	gpio_direction_input(GPIO_BATTWARN);
163	gpio_direction_output(GPIO_RESET, 1);	/* assert reset */
164	gpio_direction_output(GPIO_OUTEN, 1);	/* disable buffers */
165	gpio_direction_output(GPIO_POWER, 1);	/* power off */
166
167	return 0;
168}
169
170static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
171{
172	return 0;
173}
174
175static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt,
176				    struct pccard_io_map *map)
177{
178	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
179
180	map->start = (u32)sock->virt_io;
181	map->stop = map->start + IO_MAP_SIZE;
182
183	return 0;
184}
185
186static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt,
187				     struct pccard_mem_map *map)
188{
189	struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt);
190
191	if (map->flags & MAP_ATTRIB)
192		map->static_start = sock->phys_attr + map->card_start;
193	else
194		map->static_start = sock->phys_mem + map->card_start;
195
196	return 0;
197}
198
199static struct pccard_operations xxs1500_pcmcia_operations = {
200	.init			= xxs1500_pcmcia_sock_init,
201	.suspend		= xxs1500_pcmcia_sock_suspend,
202	.get_status		= xxs1500_pcmcia_get_status,
203	.set_socket		= xxs1500_pcmcia_configure,
204	.set_io_map		= au1x00_pcmcia_set_io_map,
205	.set_mem_map		= au1x00_pcmcia_set_mem_map,
206};
207
208static int xxs1500_pcmcia_probe(struct platform_device *pdev)
209{
210	struct xxs1500_pcmcia_sock *sock;
211	struct resource *r;
212	int ret, irq;
213
214	sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL);
215	if (!sock)
216		return -ENOMEM;
217
218	ret = -ENODEV;
219
220	/* 36bit PCMCIA Attribute area address */
221	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr");
222	if (!r) {
223		dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n");
224		goto out0;
225	}
226	sock->phys_attr = r->start;
227
228	/* 36bit PCMCIA Memory area address */
229	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem");
230	if (!r) {
231		dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n");
232		goto out0;
233	}
234	sock->phys_mem = r->start;
235
236	/* 36bit PCMCIA IO area address */
237	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io");
238	if (!r) {
239		dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n");
240		goto out0;
241	}
242	sock->phys_io = r->start;
243
244
245	/*
246	 * PCMCIA client drivers use the inb/outb macros to access
247	 * the IO registers.  Since mips_io_port_base is added
248	 * to the access address of the mips implementation of
249	 * inb/outb, we need to subtract it here because we want
250	 * to access the I/O or MEM address directly, without
251	 * going through this "mips_io_port_base" mechanism.
252	 */
253	sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) -
254				 mips_io_port_base);
255
256	if (!sock->virt_io) {
257		dev_err(&pdev->dev, "cannot remap IO area\n");
258		ret = -ENOMEM;
259		goto out0;
260	}
261
262	sock->socket.ops	= &xxs1500_pcmcia_operations;
263	sock->socket.owner	= THIS_MODULE;
264	sock->socket.pci_irq	= gpio_to_irq(GPIO_CARDIRQ);
265	sock->socket.features	= SS_CAP_STATIC_MAP | SS_CAP_PCCARD;
266	sock->socket.map_size	= MEM_MAP_SIZE;
267	sock->socket.io_offset	= (unsigned long)sock->virt_io;
268	sock->socket.dev.parent	= &pdev->dev;
269	sock->socket.resource_ops = &pccard_static_ops;
270
271	platform_set_drvdata(pdev, sock);
272
273	/* setup carddetect irq: use one of the 2 GPIOs as an
274	 * edge detector.
275	 */
276	irq = gpio_to_irq(GPIO_CDA);
277	irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH);
278	ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock);
279	if (ret) {
280		dev_err(&pdev->dev, "cannot setup cd irq\n");
281		goto out1;
282	}
283
284	ret = pcmcia_register_socket(&sock->socket);
285	if (ret) {
286		dev_err(&pdev->dev, "failed to register\n");
287		goto out2;
288	}
289
290	printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n");
291
292	return 0;
293
294out2:
295	free_irq(gpio_to_irq(GPIO_CDA), sock);
296out1:
297	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
298out0:
299	kfree(sock);
300	return ret;
301}
302
303static int xxs1500_pcmcia_remove(struct platform_device *pdev)
304{
305	struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev);
306
307	pcmcia_unregister_socket(&sock->socket);
308	free_irq(gpio_to_irq(GPIO_CDA), sock);
309	iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
310	kfree(sock);
311
312	return 0;
313}
314
315static struct platform_driver xxs1500_pcmcia_socket_driver = {
316	.driver	= {
317		.name	= "xxs1500_pcmcia",
318	},
319	.probe		= xxs1500_pcmcia_probe,
320	.remove		= xxs1500_pcmcia_remove,
321};
322
323module_platform_driver(xxs1500_pcmcia_socket_driver);
324
325MODULE_LICENSE("GPL");
326MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
327MODULE_AUTHOR("Manuel Lauss");
328