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