Root/drivers/pcmcia/at91_cf.c

1/*
2 * at91_cf.c -- AT91 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/interrupt.h>
18#include <linux/slab.h>
19
20#include <pcmcia/ss.h>
21
22#include <mach/hardware.h>
23#include <asm/io.h>
24#include <asm/sizes.h>
25#include <asm/gpio.h>
26
27#include <mach/board.h>
28#include <mach/at91rm9200_mc.h>
29
30
31/*
32 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
33 * some other bit in {A24,A22..A11} is nREG to flag memory access
34 * (vs attributes). So more than 2KB/region would just be waste.
35 * Note: These are offsets from the physical base address.
36 */
37#define CF_ATTR_PHYS (0)
38#define CF_IO_PHYS (1 << 23)
39#define CF_MEM_PHYS (0x017ff800)
40
41/*--------------------------------------------------------------------------*/
42
43static const char driver_name[] = "at91_cf";
44
45struct at91_cf_socket {
46    struct pcmcia_socket socket;
47
48    unsigned present:1;
49
50    struct platform_device *pdev;
51    struct at91_cf_data *board;
52
53    unsigned long phys_baseaddr;
54};
55
56static inline int at91_cf_present(struct at91_cf_socket *cf)
57{
58    return !gpio_get_value(cf->board->det_pin);
59}
60
61/*--------------------------------------------------------------------------*/
62
63static int at91_cf_ss_init(struct pcmcia_socket *s)
64{
65    return 0;
66}
67
68static irqreturn_t at91_cf_irq(int irq, void *_cf)
69{
70    struct at91_cf_socket *cf = _cf;
71
72    if (irq == cf->board->det_pin) {
73        unsigned present = at91_cf_present(cf);
74
75        /* kick pccard as needed */
76        if (present != cf->present) {
77            cf->present = present;
78            pr_debug("%s: card %s\n", driver_name,
79                    present ? "present" : "gone");
80            pcmcia_parse_events(&cf->socket, SS_DETECT);
81        }
82    }
83
84    return IRQ_HANDLED;
85}
86
87static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
88{
89    struct at91_cf_socket *cf;
90
91    if (!sp)
92        return -EINVAL;
93
94    cf = container_of(s, struct at91_cf_socket, socket);
95
96    /* NOTE: CF is always 3VCARD */
97    if (at91_cf_present(cf)) {
98        int rdy = cf->board->irq_pin; /* RDY/nIRQ */
99        int vcc = cf->board->vcc_pin;
100
101        *sp = SS_DETECT | SS_3VCARD;
102        if (!rdy || gpio_get_value(rdy))
103            *sp |= SS_READY;
104        if (!vcc || gpio_get_value(vcc))
105            *sp |= SS_POWERON;
106    } else
107        *sp = 0;
108
109    return 0;
110}
111
112static int
113at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
114{
115    struct at91_cf_socket *cf;
116
117    cf = container_of(sock, struct at91_cf_socket, socket);
118
119    /* switch Vcc if needed and possible */
120    if (cf->board->vcc_pin) {
121        switch (s->Vcc) {
122            case 0:
123                gpio_set_value(cf->board->vcc_pin, 0);
124                break;
125            case 33:
126                gpio_set_value(cf->board->vcc_pin, 1);
127                break;
128            default:
129                return -EINVAL;
130        }
131    }
132
133    /* toggle reset if needed */
134    gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
135
136    pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
137        driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
138
139    return 0;
140}
141
142static int at91_cf_ss_suspend(struct pcmcia_socket *s)
143{
144    return at91_cf_set_socket(s, &dead_socket);
145}
146
147/* we already mapped the I/O region */
148static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
149{
150    struct at91_cf_socket *cf;
151    u32 csr;
152
153    cf = container_of(s, struct at91_cf_socket, socket);
154    io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
155
156    /*
157     * Use 16 bit accesses unless/until we need 8-bit i/o space.
158     */
159    csr = at91_sys_read(AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
160
161    /*
162     * NOTE: this CF controller ignores IOIS16, so we can't really do
163     * MAP_AUTOSZ. The 16bit mode allows single byte access on either
164     * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
165     * purposes (and handles ide-cs).
166     *
167     * The 8bit mode is needed for odd byte access on D0-D7. It seems
168     * some cards only like that way to get at the odd byte, despite
169     * CF 3.0 spec table 35 also giving the D8-D15 option.
170     */
171    if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
172        csr |= AT91_SMC_DBW_8;
173        pr_debug("%s: 8bit i/o bus\n", driver_name);
174    } else {
175        csr |= AT91_SMC_DBW_16;
176        pr_debug("%s: 16bit i/o bus\n", driver_name);
177    }
178    at91_sys_write(AT91_SMC_CSR(cf->board->chipselect), csr);
179
180    io->start = cf->socket.io_offset;
181    io->stop = io->start + SZ_2K - 1;
182
183    return 0;
184}
185
186/* pcmcia layer maps/unmaps mem regions */
187static int
188at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
189{
190    struct at91_cf_socket *cf;
191
192    if (map->card_start)
193        return -EINVAL;
194
195    cf = container_of(s, struct at91_cf_socket, socket);
196
197    map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
198    if (map->flags & MAP_ATTRIB)
199        map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
200    else
201        map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
202
203    return 0;
204}
205
206static struct pccard_operations at91_cf_ops = {
207    .init = at91_cf_ss_init,
208    .suspend = at91_cf_ss_suspend,
209    .get_status = at91_cf_get_status,
210    .set_socket = at91_cf_set_socket,
211    .set_io_map = at91_cf_set_io_map,
212    .set_mem_map = at91_cf_set_mem_map,
213};
214
215/*--------------------------------------------------------------------------*/
216
217static int __init at91_cf_probe(struct platform_device *pdev)
218{
219    struct at91_cf_socket *cf;
220    struct at91_cf_data *board = pdev->dev.platform_data;
221    struct resource *io;
222    int status;
223
224    if (!board || !board->det_pin || !board->rst_pin)
225        return -ENODEV;
226
227    io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
228    if (!io)
229        return -ENODEV;
230
231    cf = kzalloc(sizeof *cf, GFP_KERNEL);
232    if (!cf)
233        return -ENOMEM;
234
235    cf->board = board;
236    cf->pdev = pdev;
237    cf->phys_baseaddr = io->start;
238    platform_set_drvdata(pdev, cf);
239
240    /* must be a GPIO; ergo must trigger on both edges */
241    status = gpio_request(board->det_pin, "cf_det");
242    if (status < 0)
243        goto fail0;
244    status = request_irq(board->det_pin, at91_cf_irq, 0, driver_name, cf);
245    if (status < 0)
246        goto fail00;
247    device_init_wakeup(&pdev->dev, 1);
248
249    status = gpio_request(board->rst_pin, "cf_rst");
250    if (status < 0)
251        goto fail0a;
252
253    if (board->vcc_pin) {
254        status = gpio_request(board->vcc_pin, "cf_vcc");
255        if (status < 0)
256            goto fail0b;
257    }
258
259    /*
260     * The card driver will request this irq later as needed.
261     * but it causes lots of "irqNN: nobody cared" messages
262     * unless we report that we handle everything (sigh).
263     * (Note: DK board doesn't wire the IRQ pin...)
264     */
265    if (board->irq_pin) {
266        status = gpio_request(board->irq_pin, "cf_irq");
267        if (status < 0)
268            goto fail0c;
269        status = request_irq(board->irq_pin, at91_cf_irq,
270                IRQF_SHARED, driver_name, cf);
271        if (status < 0)
272            goto fail0d;
273        cf->socket.pci_irq = board->irq_pin;
274    } else
275        cf->socket.pci_irq = nr_irqs + 1;
276
277    /* pcmcia layer only remaps "real" memory not iospace */
278    cf->socket.io_offset = (unsigned long)
279            ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
280    if (!cf->socket.io_offset) {
281        status = -ENXIO;
282        goto fail1;
283    }
284
285    /* reserve chip-select regions */
286    if (!request_mem_region(io->start, io->end + 1 - io->start,
287                driver_name)) {
288        status = -ENXIO;
289        goto fail1;
290    }
291
292    pr_info("%s: irqs det #%d, io #%d\n", driver_name,
293        board->det_pin, board->irq_pin);
294
295    cf->socket.owner = THIS_MODULE;
296    cf->socket.dev.parent = &pdev->dev;
297    cf->socket.ops = &at91_cf_ops;
298    cf->socket.resource_ops = &pccard_static_ops;
299    cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
300                | SS_CAP_MEM_ALIGN;
301    cf->socket.map_size = SZ_2K;
302    cf->socket.io[0].res = io;
303
304    status = pcmcia_register_socket(&cf->socket);
305    if (status < 0)
306        goto fail2;
307
308    return 0;
309
310fail2:
311    release_mem_region(io->start, io->end + 1 - io->start);
312fail1:
313    if (cf->socket.io_offset)
314        iounmap((void __iomem *) cf->socket.io_offset);
315    if (board->irq_pin) {
316        free_irq(board->irq_pin, cf);
317fail0d:
318        gpio_free(board->irq_pin);
319    }
320fail0c:
321    if (board->vcc_pin)
322        gpio_free(board->vcc_pin);
323fail0b:
324    gpio_free(board->rst_pin);
325fail0a:
326    device_init_wakeup(&pdev->dev, 0);
327    free_irq(board->det_pin, cf);
328fail00:
329    gpio_free(board->det_pin);
330fail0:
331    kfree(cf);
332    return status;
333}
334
335static int __exit at91_cf_remove(struct platform_device *pdev)
336{
337    struct at91_cf_socket *cf = platform_get_drvdata(pdev);
338    struct at91_cf_data *board = cf->board;
339    struct resource *io = cf->socket.io[0].res;
340
341    pcmcia_unregister_socket(&cf->socket);
342    release_mem_region(io->start, io->end + 1 - io->start);
343    iounmap((void __iomem *) cf->socket.io_offset);
344    if (board->irq_pin) {
345        free_irq(board->irq_pin, cf);
346        gpio_free(board->irq_pin);
347    }
348    if (board->vcc_pin)
349        gpio_free(board->vcc_pin);
350    gpio_free(board->rst_pin);
351    device_init_wakeup(&pdev->dev, 0);
352    free_irq(board->det_pin, cf);
353    gpio_free(board->det_pin);
354    kfree(cf);
355    return 0;
356}
357
358#ifdef CONFIG_PM
359
360static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
361{
362    struct at91_cf_socket *cf = platform_get_drvdata(pdev);
363    struct at91_cf_data *board = cf->board;
364
365    if (device_may_wakeup(&pdev->dev)) {
366        enable_irq_wake(board->det_pin);
367        if (board->irq_pin)
368            enable_irq_wake(board->irq_pin);
369    }
370    return 0;
371}
372
373static int at91_cf_resume(struct platform_device *pdev)
374{
375    struct at91_cf_socket *cf = platform_get_drvdata(pdev);
376    struct at91_cf_data *board = cf->board;
377
378    if (device_may_wakeup(&pdev->dev)) {
379        disable_irq_wake(board->det_pin);
380        if (board->irq_pin)
381            disable_irq_wake(board->irq_pin);
382    }
383
384    return 0;
385}
386
387#else
388#define at91_cf_suspend NULL
389#define at91_cf_resume NULL
390#endif
391
392static struct platform_driver at91_cf_driver = {
393    .driver = {
394        .name = (char *) driver_name,
395        .owner = THIS_MODULE,
396    },
397    .remove = __exit_p(at91_cf_remove),
398    .suspend = at91_cf_suspend,
399    .resume = at91_cf_resume,
400};
401
402/*--------------------------------------------------------------------------*/
403
404static int __init at91_cf_init(void)
405{
406    return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
407}
408module_init(at91_cf_init);
409
410static void __exit at91_cf_exit(void)
411{
412    platform_driver_unregister(&at91_cf_driver);
413}
414module_exit(at91_cf_exit);
415
416MODULE_DESCRIPTION("AT91 Compact Flash Driver");
417MODULE_AUTHOR("David Brownell");
418MODULE_LICENSE("GPL");
419MODULE_ALIAS("platform:at91_cf");
420

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