Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/pcmcia/xxs1500_ss.c

  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 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 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         = 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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