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
55 struct 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
cdirq(int irq,void * data)69 static 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
xxs1500_pcmcia_configure(struct pcmcia_socket * skt,struct socket_state_t * state)78 static 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
xxs1500_pcmcia_get_status(struct pcmcia_socket * skt,unsigned int * value)115 static 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
xxs1500_pcmcia_sock_init(struct pcmcia_socket * skt)156 static 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
xxs1500_pcmcia_sock_suspend(struct pcmcia_socket * skt)171 static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)
172 {
173 return 0;
174 }
175
au1x00_pcmcia_set_io_map(struct pcmcia_socket * skt,struct pccard_io_map * map)176 static 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
au1x00_pcmcia_set_mem_map(struct pcmcia_socket * skt,struct pccard_mem_map * map)187 static 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
200 static 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
xxs1500_pcmcia_probe(struct platform_device * pdev)209 static 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
295 out2:
296 free_irq(gpio_to_irq(GPIO_CDA), sock);
297 out1:
298 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));
299 out0:
300 kfree(sock);
301 return ret;
302 }
303
xxs1500_pcmcia_remove(struct platform_device * pdev)304 static int 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 return 0;
314 }
315
316 static struct platform_driver xxs1500_pcmcia_socket_driver = {
317 .driver = {
318 .name = "xxs1500_pcmcia",
319 },
320 .probe = xxs1500_pcmcia_probe,
321 .remove = xxs1500_pcmcia_remove,
322 };
323
324 module_platform_driver(xxs1500_pcmcia_socket_driver);
325
326 MODULE_LICENSE("GPL");
327 MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");
328 MODULE_AUTHOR("Manuel Lauss");
329