Root/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 <plat/mux.h>
28#include <plat/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
58static const char driver_name[] = "omap_cf";
59
60struct 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
77static 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 */
83static 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 */
103static irqreturn_t omap_cf_irq(int irq, void *_cf)
104{
105    omap_cf_timer((unsigned long)_cf);
106    return IRQ_HANDLED;
107}
108
109static 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->irq.AssignedIRQ = 0;
121        s->pci_irq = cf->irq;
122    } else
123        *sp = 0;
124    return 0;
125}
126
127static int
128omap_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
153static 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
161static int
162omap_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
173static int
174omap_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
188static 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
204static 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
309fail2:
310    release_mem_region(cf->phys_cf, SZ_8K);
311fail1:
312    if (cf->socket.io_offset)
313        iounmap((void __iomem *) cf->socket.io_offset);
314    free_irq(irq, cf);
315fail0:
316    kfree(cf);
317    return status;
318}
319
320static 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
334static 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
342static 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
349static void __exit omap_cf_exit(void)
350{
351    if (cpu_is_omap16xx())
352        platform_driver_unregister(&omap_cf_driver);
353}
354
355module_init(omap_cf_init);
356module_exit(omap_cf_exit);
357
358MODULE_DESCRIPTION("OMAP CF Driver");
359MODULE_LICENSE("GPL");
360MODULE_ALIAS("platform:omap_cf");
361

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