1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2007 PA Semi, Inc
4 *
5 * Maintained by: Olof Johansson <olof@lixom.net>
6 *
7 * Based on drivers/pcmcia/omap_cf.c
8 */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
13 #include <linux/platform_device.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/delay.h>
17 #include <linux/interrupt.h>
18 #include <linux/mm.h>
19 #include <linux/vmalloc.h>
20 #include <linux/of_address.h>
21 #include <linux/of_irq.h>
22 #include <linux/of_platform.h>
23 #include <linux/slab.h>
24
25 #include <pcmcia/ss.h>
26
27 static const char driver_name[] = "electra-cf";
28
29 struct electra_cf_socket {
30 struct pcmcia_socket socket;
31
32 struct timer_list timer;
33 unsigned present:1;
34 unsigned active:1;
35
36 struct platform_device *ofdev;
37 unsigned long mem_phys;
38 void __iomem *mem_base;
39 unsigned long mem_size;
40 void __iomem *io_virt;
41 unsigned int io_base;
42 unsigned int io_size;
43 u_int irq;
44 struct resource iomem;
45 void __iomem *gpio_base;
46 int gpio_detect;
47 int gpio_vsense;
48 int gpio_3v;
49 int gpio_5v;
50 };
51
52 #define POLL_INTERVAL (2 * HZ)
53
54
electra_cf_present(struct electra_cf_socket * cf)55 static int electra_cf_present(struct electra_cf_socket *cf)
56 {
57 unsigned int gpio;
58
59 gpio = in_le32(cf->gpio_base+0x40);
60 return !(gpio & (1 << cf->gpio_detect));
61 }
62
electra_cf_ss_init(struct pcmcia_socket * s)63 static int electra_cf_ss_init(struct pcmcia_socket *s)
64 {
65 return 0;
66 }
67
68 /* the timer is primarily to kick this socket's pccardd */
electra_cf_timer(struct timer_list * t)69 static void electra_cf_timer(struct timer_list *t)
70 {
71 struct electra_cf_socket *cf = from_timer(cf, t, timer);
72 int present = electra_cf_present(cf);
73
74 if (present != cf->present) {
75 cf->present = present;
76 pcmcia_parse_events(&cf->socket, SS_DETECT);
77 }
78
79 if (cf->active)
80 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
81 }
82
electra_cf_irq(int irq,void * _cf)83 static irqreturn_t electra_cf_irq(int irq, void *_cf)
84 {
85 struct electra_cf_socket *cf = _cf;
86
87 electra_cf_timer(&cf->timer);
88 return IRQ_HANDLED;
89 }
90
electra_cf_get_status(struct pcmcia_socket * s,u_int * sp)91 static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
92 {
93 struct electra_cf_socket *cf;
94
95 if (!sp)
96 return -EINVAL;
97
98 cf = container_of(s, struct electra_cf_socket, socket);
99
100 /* NOTE CF is always 3VCARD */
101 if (electra_cf_present(cf)) {
102 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
103
104 s->pci_irq = cf->irq;
105 } else
106 *sp = 0;
107 return 0;
108 }
109
electra_cf_set_socket(struct pcmcia_socket * sock,struct socket_state_t * s)110 static int electra_cf_set_socket(struct pcmcia_socket *sock,
111 struct socket_state_t *s)
112 {
113 unsigned int gpio;
114 unsigned int vcc;
115 struct electra_cf_socket *cf;
116
117 cf = container_of(sock, struct electra_cf_socket, socket);
118
119 /* "reset" means no power in our case */
120 vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
121
122 switch (vcc) {
123 case 0:
124 gpio = 0;
125 break;
126 case 33:
127 gpio = (1 << cf->gpio_3v);
128 break;
129 case 5:
130 gpio = (1 << cf->gpio_5v);
131 break;
132 default:
133 return -EINVAL;
134 }
135
136 gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
137 gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
138 out_le32(cf->gpio_base+0x90, gpio);
139
140 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
141 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
142
143 return 0;
144 }
145
electra_cf_set_io_map(struct pcmcia_socket * s,struct pccard_io_map * io)146 static int electra_cf_set_io_map(struct pcmcia_socket *s,
147 struct pccard_io_map *io)
148 {
149 return 0;
150 }
151
electra_cf_set_mem_map(struct pcmcia_socket * s,struct pccard_mem_map * map)152 static int electra_cf_set_mem_map(struct pcmcia_socket *s,
153 struct pccard_mem_map *map)
154 {
155 struct electra_cf_socket *cf;
156
157 if (map->card_start)
158 return -EINVAL;
159 cf = container_of(s, struct electra_cf_socket, socket);
160 map->static_start = cf->mem_phys;
161 map->flags &= MAP_ACTIVE|MAP_ATTRIB;
162 if (!(map->flags & MAP_ATTRIB))
163 map->static_start += 0x800;
164 return 0;
165 }
166
167 static struct pccard_operations electra_cf_ops = {
168 .init = electra_cf_ss_init,
169 .get_status = electra_cf_get_status,
170 .set_socket = electra_cf_set_socket,
171 .set_io_map = electra_cf_set_io_map,
172 .set_mem_map = electra_cf_set_mem_map,
173 };
174
electra_cf_probe(struct platform_device * ofdev)175 static int electra_cf_probe(struct platform_device *ofdev)
176 {
177 struct device *device = &ofdev->dev;
178 struct device_node *np = ofdev->dev.of_node;
179 struct electra_cf_socket *cf;
180 struct resource mem, io;
181 int status = -ENOMEM;
182 const unsigned int *prop;
183 int err;
184
185 err = of_address_to_resource(np, 0, &mem);
186 if (err)
187 return -EINVAL;
188
189 err = of_address_to_resource(np, 1, &io);
190 if (err)
191 return -EINVAL;
192
193 cf = kzalloc(sizeof(*cf), GFP_KERNEL);
194 if (!cf)
195 return -ENOMEM;
196
197 timer_setup(&cf->timer, electra_cf_timer, 0);
198 cf->irq = 0;
199
200 cf->ofdev = ofdev;
201 cf->mem_phys = mem.start;
202 cf->mem_size = PAGE_ALIGN(resource_size(&mem));
203 cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
204 if (!cf->mem_base)
205 goto out_free_cf;
206 cf->io_size = PAGE_ALIGN(resource_size(&io));
207 cf->io_virt = ioremap_phb(io.start, cf->io_size);
208 if (!cf->io_virt)
209 goto out_unmap_mem;
210
211 cf->gpio_base = ioremap(0xfc103000, 0x1000);
212 if (!cf->gpio_base)
213 goto out_unmap_virt;
214 dev_set_drvdata(device, cf);
215
216 cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
217 cf->iomem.start = (unsigned long)cf->mem_base;
218 cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
219 cf->iomem.flags = IORESOURCE_MEM;
220
221 cf->irq = irq_of_parse_and_map(np, 0);
222
223 status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
224 driver_name, cf);
225 if (status < 0) {
226 dev_err(device, "request_irq failed\n");
227 goto fail1;
228 }
229
230 cf->socket.pci_irq = cf->irq;
231
232 status = -EINVAL;
233
234 prop = of_get_property(np, "card-detect-gpio", NULL);
235 if (!prop)
236 goto fail1;
237 cf->gpio_detect = *prop;
238
239 prop = of_get_property(np, "card-vsense-gpio", NULL);
240 if (!prop)
241 goto fail1;
242 cf->gpio_vsense = *prop;
243
244 prop = of_get_property(np, "card-3v-gpio", NULL);
245 if (!prop)
246 goto fail1;
247 cf->gpio_3v = *prop;
248
249 prop = of_get_property(np, "card-5v-gpio", NULL);
250 if (!prop)
251 goto fail1;
252 cf->gpio_5v = *prop;
253
254 cf->socket.io_offset = cf->io_base;
255
256 /* reserve chip-select regions */
257 if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
258 status = -ENXIO;
259 dev_err(device, "Can't claim memory region\n");
260 goto fail1;
261 }
262
263 if (!request_region(cf->io_base, cf->io_size, driver_name)) {
264 status = -ENXIO;
265 dev_err(device, "Can't claim I/O region\n");
266 goto fail2;
267 }
268
269 cf->socket.owner = THIS_MODULE;
270 cf->socket.dev.parent = &ofdev->dev;
271 cf->socket.ops = &electra_cf_ops;
272 cf->socket.resource_ops = &pccard_static_ops;
273 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
274 SS_CAP_MEM_ALIGN;
275 cf->socket.map_size = 0x800;
276
277 status = pcmcia_register_socket(&cf->socket);
278 if (status < 0) {
279 dev_err(device, "pcmcia_register_socket failed\n");
280 goto fail3;
281 }
282
283 dev_info(device, "at mem 0x%lx io 0x%llx irq %d\n",
284 cf->mem_phys, io.start, cf->irq);
285
286 cf->active = 1;
287 electra_cf_timer(&cf->timer);
288 return 0;
289
290 fail3:
291 release_region(cf->io_base, cf->io_size);
292 fail2:
293 release_mem_region(cf->mem_phys, cf->mem_size);
294 fail1:
295 if (cf->irq)
296 free_irq(cf->irq, cf);
297
298 iounmap(cf->gpio_base);
299 out_unmap_virt:
300 device_init_wakeup(&ofdev->dev, 0);
301 iounmap(cf->io_virt);
302 out_unmap_mem:
303 iounmap(cf->mem_base);
304 out_free_cf:
305 kfree(cf);
306 return status;
307
308 }
309
electra_cf_remove(struct platform_device * ofdev)310 static int electra_cf_remove(struct platform_device *ofdev)
311 {
312 struct device *device = &ofdev->dev;
313 struct electra_cf_socket *cf;
314
315 cf = dev_get_drvdata(device);
316
317 cf->active = 0;
318 pcmcia_unregister_socket(&cf->socket);
319 free_irq(cf->irq, cf);
320 del_timer_sync(&cf->timer);
321
322 iounmap(cf->io_virt);
323 iounmap(cf->mem_base);
324 iounmap(cf->gpio_base);
325 release_mem_region(cf->mem_phys, cf->mem_size);
326 release_region(cf->io_base, cf->io_size);
327
328 kfree(cf);
329
330 return 0;
331 }
332
333 static const struct of_device_id electra_cf_match[] = {
334 {
335 .compatible = "electra-cf",
336 },
337 {},
338 };
339 MODULE_DEVICE_TABLE(of, electra_cf_match);
340
341 static struct platform_driver electra_cf_driver = {
342 .driver = {
343 .name = driver_name,
344 .of_match_table = electra_cf_match,
345 },
346 .probe = electra_cf_probe,
347 .remove = electra_cf_remove,
348 };
349
350 module_platform_driver(electra_cf_driver);
351
352 MODULE_LICENSE("GPL");
353 MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
354 MODULE_DESCRIPTION("PA Semi Electra CF driver");
355
