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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/platform_device.h> |
15 | #include <linux/pm.h> |
16 | #include <linux/resource.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/spinlock.h> |
19 | |
20 | #include <pcmcia/cs_types.h> |
21 | #include <pcmcia/cs.h> |
22 | #include <pcmcia/ss.h> |
23 | #include <pcmcia/cistpl.h> |
24 | |
25 | #include <asm/irq.h> |
26 | #include <asm/system.h> |
27 | #include <asm/mach-au1x00/au1000.h> |
28 | |
29 | #define MEM_MAP_SIZE 0x400000 |
30 | #define IO_MAP_SIZE 0x1000 |
31 | |
32 | |
33 | /* |
34 | * 3.3V cards only; all interfacing is done via gpios: |
35 | * |
36 | * 0/1: carddetect (00 = card present, xx = huh) |
37 | * 4: card irq |
38 | * 204: reset (high-act) |
39 | * 205: buffer enable (low-act) |
40 | * 208/209: card voltage key (00,01,10,11) |
41 | * 210: battwarn |
42 | * 211: batdead |
43 | * 214: power (low-act) |
44 | */ |
45 | #define GPIO_CDA 0 |
46 | #define GPIO_CDB 1 |
47 | #define GPIO_CARDIRQ 4 |
48 | #define GPIO_RESET 204 |
49 | #define GPIO_OUTEN 205 |
50 | #define GPIO_VSL 208 |
51 | #define GPIO_VSH 209 |
52 | #define GPIO_BATTDEAD 210 |
53 | #define GPIO_BATTWARN 211 |
54 | #define GPIO_POWER 214 |
55 | |
56 | struct xxs1500_pcmcia_sock { |
57 | struct pcmcia_socket socket; |
58 | void *virt_io; |
59 | |
60 | phys_addr_t phys_io; |
61 | phys_addr_t phys_attr; |
62 | phys_addr_t phys_mem; |
63 | |
64 | /* previous flags for set_socket() */ |
65 | unsigned int old_flags; |
66 | }; |
67 | |
68 | #define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket) |
69 | |
70 | static irqreturn_t cdirq(int irq, void *data) |
71 | { |
72 | struct xxs1500_pcmcia_sock *sock = data; |
73 | |
74 | pcmcia_parse_events(&sock->socket, SS_DETECT); |
75 | |
76 | return IRQ_HANDLED; |
77 | } |
78 | |
79 | static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt, |
80 | struct socket_state_t *state) |
81 | { |
82 | struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); |
83 | unsigned int changed; |
84 | |
85 | /* power control */ |
86 | switch (state->Vcc) { |
87 | case 0: |
88 | gpio_set_value(GPIO_POWER, 1); /* power off */ |
89 | break; |
90 | case 33: |
91 | gpio_set_value(GPIO_POWER, 0); /* power on */ |
92 | break; |
93 | case 50: |
94 | default: |
95 | return -EINVAL; |
96 | } |
97 | |
98 | changed = state->flags ^ sock->old_flags; |
99 | |
100 | if (changed & SS_RESET) { |
101 | if (state->flags & SS_RESET) { |
102 | gpio_set_value(GPIO_RESET, 1); /* assert reset */ |
103 | gpio_set_value(GPIO_OUTEN, 1); /* buffers off */ |
104 | } else { |
105 | gpio_set_value(GPIO_RESET, 0); /* deassert reset */ |
106 | gpio_set_value(GPIO_OUTEN, 0); /* buffers on */ |
107 | msleep(500); |
108 | } |
109 | } |
110 | |
111 | sock->old_flags = state->flags; |
112 | |
113 | return 0; |
114 | } |
115 | |
116 | static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt, |
117 | unsigned int *value) |
118 | { |
119 | unsigned int status; |
120 | int i; |
121 | |
122 | status = 0; |
123 | |
124 | /* check carddetects: GPIO[0:1] must both be low */ |
125 | if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB)) |
126 | status |= SS_DETECT; |
127 | |
128 | /* determine card voltage: GPIO[208:209] binary value */ |
129 | i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1); |
130 | |
131 | switch (i) { |
132 | case 0: |
133 | case 1: |
134 | case 2: |
135 | status |= SS_3VCARD; /* 3V card */ |
136 | break; |
137 | case 3: /* 5V card, unsupported */ |
138 | default: |
139 | status |= SS_XVCARD; /* treated as unsupported in core */ |
140 | } |
141 | |
142 | /* GPIO214: low active power switch */ |
143 | status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON; |
144 | |
145 | /* GPIO204: high-active reset line */ |
146 | status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY; |
147 | |
148 | /* other stuff */ |
149 | status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD; |
150 | status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN; |
151 | |
152 | *value = status; |
153 | |
154 | return 0; |
155 | } |
156 | |
157 | static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt) |
158 | { |
159 | gpio_direction_input(GPIO_CDA); |
160 | gpio_direction_input(GPIO_CDB); |
161 | gpio_direction_input(GPIO_VSL); |
162 | gpio_direction_input(GPIO_VSH); |
163 | gpio_direction_input(GPIO_BATTDEAD); |
164 | gpio_direction_input(GPIO_BATTWARN); |
165 | gpio_direction_output(GPIO_RESET, 1); /* assert reset */ |
166 | gpio_direction_output(GPIO_OUTEN, 1); /* disable buffers */ |
167 | gpio_direction_output(GPIO_POWER, 1); /* power off */ |
168 | |
169 | return 0; |
170 | } |
171 | |
172 | static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt) |
173 | { |
174 | return 0; |
175 | } |
176 | |
177 | static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt, |
178 | struct pccard_io_map *map) |
179 | { |
180 | struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); |
181 | |
182 | map->start = (u32)sock->virt_io; |
183 | map->stop = map->start + IO_MAP_SIZE; |
184 | |
185 | return 0; |
186 | } |
187 | |
188 | static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt, |
189 | struct pccard_mem_map *map) |
190 | { |
191 | struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); |
192 | |
193 | if (map->flags & MAP_ATTRIB) |
194 | map->static_start = sock->phys_attr + map->card_start; |
195 | else |
196 | map->static_start = sock->phys_mem + map->card_start; |
197 | |
198 | return 0; |
199 | } |
200 | |
201 | static struct pccard_operations xxs1500_pcmcia_operations = { |
202 | .init = xxs1500_pcmcia_sock_init, |
203 | .suspend = xxs1500_pcmcia_sock_suspend, |
204 | .get_status = xxs1500_pcmcia_get_status, |
205 | .set_socket = xxs1500_pcmcia_configure, |
206 | .set_io_map = au1x00_pcmcia_set_io_map, |
207 | .set_mem_map = au1x00_pcmcia_set_mem_map, |
208 | }; |
209 | |
210 | static int __devinit xxs1500_pcmcia_probe(struct platform_device *pdev) |
211 | { |
212 | struct xxs1500_pcmcia_sock *sock; |
213 | struct resource *r; |
214 | int ret, irq; |
215 | |
216 | sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL); |
217 | if (!sock) |
218 | return -ENOMEM; |
219 | |
220 | ret = -ENODEV; |
221 | |
222 | /* 36bit PCMCIA Attribute area address */ |
223 | r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr"); |
224 | if (!r) { |
225 | dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n"); |
226 | goto out0; |
227 | } |
228 | sock->phys_attr = r->start; |
229 | |
230 | /* 36bit PCMCIA Memory area address */ |
231 | r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem"); |
232 | if (!r) { |
233 | dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n"); |
234 | goto out0; |
235 | } |
236 | sock->phys_mem = r->start; |
237 | |
238 | /* 36bit PCMCIA IO area address */ |
239 | r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io"); |
240 | if (!r) { |
241 | dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n"); |
242 | goto out0; |
243 | } |
244 | sock->phys_io = r->start; |
245 | |
246 | |
247 | /* |
248 | * PCMCIA client drivers use the inb/outb macros to access |
249 | * the IO registers. Since mips_io_port_base is added |
250 | * to the access address of the mips implementation of |
251 | * inb/outb, we need to subtract it here because we want |
252 | * to access the I/O or MEM address directly, without |
253 | * going through this "mips_io_port_base" mechanism. |
254 | */ |
255 | sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) - |
256 | mips_io_port_base); |
257 | |
258 | if (!sock->virt_io) { |
259 | dev_err(&pdev->dev, "cannot remap IO area\n"); |
260 | ret = -ENOMEM; |
261 | goto out0; |
262 | } |
263 | |
264 | sock->socket.ops = &xxs1500_pcmcia_operations; |
265 | sock->socket.owner = THIS_MODULE; |
266 | sock->socket.pci_irq = gpio_to_irq(GPIO_CARDIRQ); |
267 | sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD; |
268 | sock->socket.map_size = MEM_MAP_SIZE; |
269 | sock->socket.io_offset = (unsigned long)sock->virt_io; |
270 | sock->socket.dev.parent = &pdev->dev; |
271 | sock->socket.resource_ops = &pccard_static_ops; |
272 | |
273 | platform_set_drvdata(pdev, sock); |
274 | |
275 | /* setup carddetect irq: use one of the 2 GPIOs as an |
276 | * edge detector. |
277 | */ |
278 | irq = gpio_to_irq(GPIO_CDA); |
279 | set_irq_type(irq, IRQ_TYPE_EDGE_BOTH); |
280 | ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock); |
281 | if (ret) { |
282 | dev_err(&pdev->dev, "cannot setup cd irq\n"); |
283 | goto out1; |
284 | } |
285 | |
286 | ret = pcmcia_register_socket(&sock->socket); |
287 | if (ret) { |
288 | dev_err(&pdev->dev, "failed to register\n"); |
289 | goto out2; |
290 | } |
291 | |
292 | printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n"); |
293 | |
294 | return 0; |
295 | |
296 | out2: |
297 | free_irq(gpio_to_irq(GPIO_CDA), sock); |
298 | out1: |
299 | iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); |
300 | out0: |
301 | kfree(sock); |
302 | return ret; |
303 | } |
304 | |
305 | static int __devexit xxs1500_pcmcia_remove(struct platform_device *pdev) |
306 | { |
307 | struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev); |
308 | |
309 | pcmcia_unregister_socket(&sock->socket); |
310 | free_irq(gpio_to_irq(GPIO_CDA), sock); |
311 | iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); |
312 | kfree(sock); |
313 | |
314 | return 0; |
315 | } |
316 | |
317 | static struct platform_driver xxs1500_pcmcia_socket_driver = { |
318 | .driver = { |
319 | .name = "xxs1500_pcmcia", |
320 | .owner = THIS_MODULE, |
321 | }, |
322 | .probe = xxs1500_pcmcia_probe, |
323 | .remove = __devexit_p(xxs1500_pcmcia_remove), |
324 | }; |
325 | |
326 | int __init xxs1500_pcmcia_socket_load(void) |
327 | { |
328 | return platform_driver_register(&xxs1500_pcmcia_socket_driver); |
329 | } |
330 | |
331 | void __exit xxs1500_pcmcia_socket_unload(void) |
332 | { |
333 | platform_driver_unregister(&xxs1500_pcmcia_socket_driver); |
334 | } |
335 | |
336 | module_init(xxs1500_pcmcia_socket_load); |
337 | module_exit(xxs1500_pcmcia_socket_unload); |
338 | |
339 | MODULE_LICENSE("GPL"); |
340 | MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems"); |
341 | MODULE_AUTHOR("Manuel Lauss"); |
342 |
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