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#include <linux/gpio.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/board.h>
28#include <mach/at91rm9200_mc.h>
29#include <mach/at91_ramc.h>
30
31
32/*
33 * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
34 * some other bit in {A24,A22..A11} is nREG to flag memory access
35 * (vs attributes). So more than 2KB/region would just be waste.
36 * Note: These are offsets from the physical base address.
37 */
38#define CF_ATTR_PHYS (0)
39#define CF_IO_PHYS (1 << 23)
40#define CF_MEM_PHYS (0x017ff800)
41
42/*--------------------------------------------------------------------------*/
43
44static const char driver_name[] = "at91_cf";
45
46struct at91_cf_socket {
47    struct pcmcia_socket socket;
48
49    unsigned present:1;
50
51    struct platform_device *pdev;
52    struct at91_cf_data *board;
53
54    unsigned long phys_baseaddr;
55};
56
57static inline int at91_cf_present(struct at91_cf_socket *cf)
58{
59    return !gpio_get_value(cf->board->det_pin);
60}
61
62/*--------------------------------------------------------------------------*/
63
64static int at91_cf_ss_init(struct pcmcia_socket *s)
65{
66    return 0;
67}
68
69static irqreturn_t at91_cf_irq(int irq, void *_cf)
70{
71    struct at91_cf_socket *cf = _cf;
72
73    if (irq == gpio_to_irq(cf->board->det_pin)) {
74        unsigned present = at91_cf_present(cf);
75
76        /* kick pccard as needed */
77        if (present != cf->present) {
78            cf->present = present;
79            pr_debug("%s: card %s\n", driver_name,
80                    present ? "present" : "gone");
81            pcmcia_parse_events(&cf->socket, SS_DETECT);
82        }
83    }
84
85    return IRQ_HANDLED;
86}
87
88static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
89{
90    struct at91_cf_socket *cf;
91
92    if (!sp)
93        return -EINVAL;
94
95    cf = container_of(s, struct at91_cf_socket, socket);
96
97    /* NOTE: CF is always 3VCARD */
98    if (at91_cf_present(cf)) {
99        int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
100        int vcc = gpio_is_valid(cf->board->vcc_pin);
101
102        *sp = SS_DETECT | SS_3VCARD;
103        if (!rdy || gpio_get_value(rdy))
104            *sp |= SS_READY;
105        if (!vcc || gpio_get_value(vcc))
106            *sp |= SS_POWERON;
107    } else
108        *sp = 0;
109
110    return 0;
111}
112
113static int
114at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
115{
116    struct at91_cf_socket *cf;
117
118    cf = container_of(sock, struct at91_cf_socket, socket);
119
120    /* switch Vcc if needed and possible */
121    if (gpio_is_valid(cf->board->vcc_pin)) {
122        switch (s->Vcc) {
123            case 0:
124                gpio_set_value(cf->board->vcc_pin, 0);
125                break;
126            case 33:
127                gpio_set_value(cf->board->vcc_pin, 1);
128                break;
129            default:
130                return -EINVAL;
131        }
132    }
133
134    /* toggle reset if needed */
135    gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
136
137    pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
138        driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
139
140    return 0;
141}
142
143static int at91_cf_ss_suspend(struct pcmcia_socket *s)
144{
145    return at91_cf_set_socket(s, &dead_socket);
146}
147
148/* we already mapped the I/O region */
149static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
150{
151    struct at91_cf_socket *cf;
152    u32 csr;
153
154    cf = container_of(s, struct at91_cf_socket, socket);
155    io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
156
157    /*
158     * Use 16 bit accesses unless/until we need 8-bit i/o space.
159     */
160    csr = at91_ramc_read(0, AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
161
162    /*
163     * NOTE: this CF controller ignores IOIS16, so we can't really do
164     * MAP_AUTOSZ. The 16bit mode allows single byte access on either
165     * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
166     * purposes (and handles ide-cs).
167     *
168     * The 8bit mode is needed for odd byte access on D0-D7. It seems
169     * some cards only like that way to get at the odd byte, despite
170     * CF 3.0 spec table 35 also giving the D8-D15 option.
171     */
172    if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
173        csr |= AT91_SMC_DBW_8;
174        pr_debug("%s: 8bit i/o bus\n", driver_name);
175    } else {
176        csr |= AT91_SMC_DBW_16;
177        pr_debug("%s: 16bit i/o bus\n", driver_name);
178    }
179    at91_ramc_write(0, AT91_SMC_CSR(cf->board->chipselect), csr);
180
181    io->start = cf->socket.io_offset;
182    io->stop = io->start + SZ_2K - 1;
183
184    return 0;
185}
186
187/* pcmcia layer maps/unmaps mem regions */
188static int
189at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
190{
191    struct at91_cf_socket *cf;
192
193    if (map->card_start)
194        return -EINVAL;
195
196    cf = container_of(s, struct at91_cf_socket, socket);
197
198    map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
199    if (map->flags & MAP_ATTRIB)
200        map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
201    else
202        map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
203
204    return 0;
205}
206
207static struct pccard_operations at91_cf_ops = {
208    .init = at91_cf_ss_init,
209    .suspend = at91_cf_ss_suspend,
210    .get_status = at91_cf_get_status,
211    .set_socket = at91_cf_set_socket,
212    .set_io_map = at91_cf_set_io_map,
213    .set_mem_map = at91_cf_set_mem_map,
214};
215
216/*--------------------------------------------------------------------------*/
217
218static int __init at91_cf_probe(struct platform_device *pdev)
219{
220    struct at91_cf_socket *cf;
221    struct at91_cf_data *board = pdev->dev.platform_data;
222    struct resource *io;
223    int status;
224
225    if (!board || !gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
226        return -ENODEV;
227
228    io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
229    if (!io)
230        return -ENODEV;
231
232    cf = kzalloc(sizeof *cf, GFP_KERNEL);
233    if (!cf)
234        return -ENOMEM;
235
236    cf->board = board;
237    cf->pdev = pdev;
238    cf->phys_baseaddr = io->start;
239    platform_set_drvdata(pdev, cf);
240
241    /* must be a GPIO; ergo must trigger on both edges */
242    status = gpio_request(board->det_pin, "cf_det");
243    if (status < 0)
244        goto fail0;
245    status = request_irq(gpio_to_irq(board->det_pin), at91_cf_irq, 0, driver_name, cf);
246    if (status < 0)
247        goto fail00;
248    device_init_wakeup(&pdev->dev, 1);
249
250    status = gpio_request(board->rst_pin, "cf_rst");
251    if (status < 0)
252        goto fail0a;
253
254    if (gpio_is_valid(board->vcc_pin)) {
255        status = gpio_request(board->vcc_pin, "cf_vcc");
256        if (status < 0)
257            goto fail0b;
258    }
259
260    /*
261     * The card driver will request this irq later as needed.
262     * but it causes lots of "irqNN: nobody cared" messages
263     * unless we report that we handle everything (sigh).
264     * (Note: DK board doesn't wire the IRQ pin...)
265     */
266    if (gpio_is_valid(board->irq_pin)) {
267        status = gpio_request(board->irq_pin, "cf_irq");
268        if (status < 0)
269            goto fail0c;
270        status = request_irq(gpio_to_irq(board->irq_pin), at91_cf_irq,
271                IRQF_SHARED, driver_name, cf);
272        if (status < 0)
273            goto fail0d;
274        cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
275    } else
276        cf->socket.pci_irq = nr_irqs + 1;
277
278    /* pcmcia layer only remaps "real" memory not iospace */
279    cf->socket.io_offset = (unsigned long)
280            ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
281    if (!cf->socket.io_offset) {
282        status = -ENXIO;
283        goto fail1;
284    }
285
286    /* reserve chip-select regions */
287    if (!request_mem_region(io->start, resource_size(io), driver_name)) {
288        status = -ENXIO;
289        goto fail1;
290    }
291
292    pr_info("%s: irqs det #%d, io #%d\n", driver_name,
293        gpio_to_irq(board->det_pin), gpio_to_irq(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, resource_size(io));
312fail1:
313    if (cf->socket.io_offset)
314        iounmap((void __iomem *) cf->socket.io_offset);
315    if (gpio_is_valid(board->irq_pin)) {
316        free_irq(gpio_to_irq(board->irq_pin), cf);
317fail0d:
318        gpio_free(board->irq_pin);
319    }
320fail0c:
321    if (gpio_is_valid(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(gpio_to_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, resource_size(io));
343    iounmap((void __iomem *) cf->socket.io_offset);
344    if (gpio_is_valid(board->irq_pin)) {
345        free_irq(gpio_to_irq(board->irq_pin), cf);
346        gpio_free(board->irq_pin);
347    }
348    if (gpio_is_valid(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(gpio_to_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(gpio_to_irq(board->det_pin));
367        if (gpio_is_valid(board->irq_pin))
368            enable_irq_wake(gpio_to_irq(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(gpio_to_irq(board->det_pin));
380        if (gpio_is_valid(board->irq_pin))
381            disable_irq_wake(gpio_to_irq(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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