Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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