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Linux/drivers/pcmcia/omap_cf.c

  1 /*
  2  * omap_cf.c -- OMAP 16xx CompactFlash controller driver
  3  *
  4  * Copyright (c) 2005 David Brownell
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/kernel.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/errno.h>
 16 #include <linux/init.h>
 17 #include <linux/delay.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/slab.h>
 20 
 21 #include <pcmcia/ss.h>
 22 
 23 #include <mach/hardware.h>
 24 #include <asm/io.h>
 25 #include <asm/sizes.h>
 26 
 27 #include <mach/mux.h>
 28 #include <mach/tc.h>
 29 
 30 
 31 /* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
 32  * hard-wired timings to support Compact Flash memory cards; they won't work
 33  * with various other devices (like WLAN adapters) without some external
 34  * logic to help out.
 35  *
 36  * NOTE:  CF controller docs disagree with address space docs as to where
 37  * CF_BASE really lives; this is a doc erratum.
 38  */
 39 #define CF_BASE 0xfffe2800
 40 
 41 /* status; read after IRQ */
 42 #define CF_STATUS                       (CF_BASE + 0x00)
 43 #       define  CF_STATUS_BAD_READ      (1 << 2)
 44 #       define  CF_STATUS_BAD_WRITE     (1 << 1)
 45 #       define  CF_STATUS_CARD_DETECT   (1 << 0)
 46 
 47 /* which chipselect (CS0..CS3) is used for CF (active low) */
 48 #define CF_CFG                          (CF_BASE + 0x02)
 49 
 50 /* card reset */
 51 #define CF_CONTROL                      (CF_BASE + 0x04)
 52 #       define  CF_CONTROL_RESET        (1 << 0)
 53 
 54 #define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))
 55 
 56 /*--------------------------------------------------------------------------*/
 57 
 58 static const char driver_name[] = "omap_cf";
 59 
 60 struct omap_cf_socket {
 61         struct pcmcia_socket    socket;
 62 
 63         struct timer_list       timer;
 64         unsigned                present:1;
 65         unsigned                active:1;
 66 
 67         struct platform_device  *pdev;
 68         unsigned long           phys_cf;
 69         u_int                   irq;
 70         struct resource         iomem;
 71 };
 72 
 73 #define POLL_INTERVAL           (2 * HZ)
 74 
 75 /*--------------------------------------------------------------------------*/
 76 
 77 static int omap_cf_ss_init(struct pcmcia_socket *s)
 78 {
 79         return 0;
 80 }
 81 
 82 /* the timer is primarily to kick this socket's pccardd */
 83 static void omap_cf_timer(unsigned long _cf)
 84 {
 85         struct omap_cf_socket   *cf = (void *) _cf;
 86         unsigned                present = omap_cf_present();
 87 
 88         if (present != cf->present) {
 89                 cf->present = present;
 90                 pr_debug("%s: card %s\n", driver_name,
 91                         present ? "present" : "gone");
 92                 pcmcia_parse_events(&cf->socket, SS_DETECT);
 93         }
 94 
 95         if (cf->active)
 96                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 97 }
 98 
 99 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers
100  * claim the card's IRQ.  It may also detect some card insertions, but
101  * not removals; it can't always eliminate timer irqs.
102  */
103 static irqreturn_t omap_cf_irq(int irq, void *_cf)
104 {
105         omap_cf_timer((unsigned long)_cf);
106         return IRQ_HANDLED;
107 }
108 
109 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
110 {
111         if (!sp)
112                 return -EINVAL;
113 
114         /* NOTE CF is always 3VCARD */
115         if (omap_cf_present()) {
116                 struct omap_cf_socket   *cf;
117 
118                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
119                 cf = container_of(s, struct omap_cf_socket, socket);
120                 s->pcmcia_irq = 0;
121                 s->pci_irq = cf->irq;
122         } else
123                 *sp = 0;
124         return 0;
125 }
126 
127 static int
128 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
129 {
130         u16             control;
131 
132         /* REVISIT some non-OSK boards may support power switching */
133         switch (s->Vcc) {
134         case 0:
135         case 33:
136                 break;
137         default:
138                 return -EINVAL;
139         }
140 
141         control = omap_readw(CF_CONTROL);
142         if (s->flags & SS_RESET)
143                 omap_writew(CF_CONTROL_RESET, CF_CONTROL);
144         else
145                 omap_writew(0, CF_CONTROL);
146 
147         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
148                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
149 
150         return 0;
151 }
152 
153 static int omap_cf_ss_suspend(struct pcmcia_socket *s)
154 {
155         pr_debug("%s: %s\n", driver_name, __func__);
156         return omap_cf_set_socket(s, &dead_socket);
157 }
158 
159 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
160 
161 static int
162 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
163 {
164         struct omap_cf_socket   *cf;
165 
166         cf = container_of(s, struct omap_cf_socket, socket);
167         io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
168         io->start = cf->phys_cf + SZ_4K;
169         io->stop = io->start + SZ_2K - 1;
170         return 0;
171 }
172 
173 static int
174 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
175 {
176         struct omap_cf_socket   *cf;
177 
178         if (map->card_start)
179                 return -EINVAL;
180         cf = container_of(s, struct omap_cf_socket, socket);
181         map->static_start = cf->phys_cf;
182         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
183         if (map->flags & MAP_ATTRIB)
184                 map->static_start += SZ_2K;
185         return 0;
186 }
187 
188 static struct pccard_operations omap_cf_ops = {
189         .init                   = omap_cf_ss_init,
190         .suspend                = omap_cf_ss_suspend,
191         .get_status             = omap_cf_get_status,
192         .set_socket             = omap_cf_set_socket,
193         .set_io_map             = omap_cf_set_io_map,
194         .set_mem_map            = omap_cf_set_mem_map,
195 };
196 
197 /*--------------------------------------------------------------------------*/
198 
199 /*
200  * NOTE:  right now the only board-specific platform_data is
201  * "what chipselect is used".  Boards could want more.
202  */
203 
204 static int __init omap_cf_probe(struct platform_device *pdev)
205 {
206         unsigned                seg;
207         struct omap_cf_socket   *cf;
208         int                     irq;
209         int                     status;
210 
211         seg = (int) pdev->dev.platform_data;
212         if (seg == 0 || seg > 3)
213                 return -ENODEV;
214 
215         /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
216         irq = platform_get_irq(pdev, 0);
217         if (irq < 0)
218                 return -EINVAL;
219 
220         cf = kzalloc(sizeof *cf, GFP_KERNEL);
221         if (!cf)
222                 return -ENOMEM;
223         init_timer(&cf->timer);
224         cf->timer.function = omap_cf_timer;
225         cf->timer.data = (unsigned long) cf;
226 
227         cf->pdev = pdev;
228         platform_set_drvdata(pdev, cf);
229 
230         /* this primarily just shuts up irq handling noise */
231         status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
232                         driver_name, cf);
233         if (status < 0)
234                 goto fail0;
235         cf->irq = irq;
236         cf->socket.pci_irq = irq;
237 
238         switch (seg) {
239         /* NOTE: CS0 could be configured too ... */
240         case 1:
241                 cf->phys_cf = OMAP_CS1_PHYS;
242                 break;
243         case 2:
244                 cf->phys_cf = OMAP_CS2_PHYS;
245                 break;
246         case 3:
247                 cf->phys_cf = omap_cs3_phys();
248                 break;
249         default:
250                 goto  fail1;
251         }
252         cf->iomem.start = cf->phys_cf;
253         cf->iomem.end = cf->iomem.end + SZ_8K - 1;
254         cf->iomem.flags = IORESOURCE_MEM;
255 
256         /* pcmcia layer only remaps "real" memory */
257         cf->socket.io_offset = (unsigned long)
258                         ioremap(cf->phys_cf + SZ_4K, SZ_2K);
259         if (!cf->socket.io_offset)
260                 goto fail1;
261 
262         if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
263                 goto fail1;
264 
265         /* NOTE:  CF conflicts with MMC1 */
266         omap_cfg_reg(W11_1610_CF_CD1);
267         omap_cfg_reg(P11_1610_CF_CD2);
268         omap_cfg_reg(R11_1610_CF_IOIS16);
269         omap_cfg_reg(V10_1610_CF_IREQ);
270         omap_cfg_reg(W10_1610_CF_RESET);
271 
272         omap_writew(~(1 << seg), CF_CFG);
273 
274         pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
275 
276         /* NOTE:  better EMIFS setup might support more cards; but the
277          * TRM only shows how to affect regular flash signals, not their
278          * CF/PCMCIA variants...
279          */
280         pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
281                 seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
282         omap_writel(0x0004a1b3, EMIFS_CCS(seg));        /* synch mode 4 etc */
283         omap_writel(0x00000000, EMIFS_ACS(seg));        /* OE hold/setup */
284 
285         /* CF uses armxor_ck, which is "always" available */
286 
287         pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
288                 omap_readw(CF_STATUS), omap_readw(CF_CFG),
289                 omap_readw(CF_CONTROL),
290                 omap_cf_present() ? "present" : "(not present)");
291 
292         cf->socket.owner = THIS_MODULE;
293         cf->socket.dev.parent = &pdev->dev;
294         cf->socket.ops = &omap_cf_ops;
295         cf->socket.resource_ops = &pccard_static_ops;
296         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
297                                 | SS_CAP_MEM_ALIGN;
298         cf->socket.map_size = SZ_2K;
299         cf->socket.io[0].res = &cf->iomem;
300 
301         status = pcmcia_register_socket(&cf->socket);
302         if (status < 0)
303                 goto fail2;
304 
305         cf->active = 1;
306         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
307         return 0;
308 
309 fail2:
310         release_mem_region(cf->phys_cf, SZ_8K);
311 fail1:
312         if (cf->socket.io_offset)
313                 iounmap((void __iomem *) cf->socket.io_offset);
314         free_irq(irq, cf);
315 fail0:
316         kfree(cf);
317         return status;
318 }
319 
320 static int __exit omap_cf_remove(struct platform_device *pdev)
321 {
322         struct omap_cf_socket *cf = platform_get_drvdata(pdev);
323 
324         cf->active = 0;
325         pcmcia_unregister_socket(&cf->socket);
326         del_timer_sync(&cf->timer);
327         iounmap((void __iomem *) cf->socket.io_offset);
328         release_mem_region(cf->phys_cf, SZ_8K);
329         free_irq(cf->irq, cf);
330         kfree(cf);
331         return 0;
332 }
333 
334 static struct platform_driver omap_cf_driver = {
335         .driver = {
336                 .name   = (char *) driver_name,
337                 .owner  = THIS_MODULE,
338         },
339         .remove         = __exit_p(omap_cf_remove),
340 };
341 
342 static int __init omap_cf_init(void)
343 {
344         if (cpu_is_omap16xx())
345                 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
346         return -ENODEV;
347 }
348 
349 static void __exit omap_cf_exit(void)
350 {
351         if (cpu_is_omap16xx())
352                 platform_driver_unregister(&omap_cf_driver);
353 }
354 
355 module_init(omap_cf_init);
356 module_exit(omap_cf_exit);
357 
358 MODULE_DESCRIPTION("OMAP CF Driver");
359 MODULE_LICENSE("GPL");
360 MODULE_ALIAS("platform:omap_cf");
361 

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