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2c1f3b7a AV |
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/sched.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/interrupt.h> | |
19 | ||
20 | #include <pcmcia/ss.h> | |
21 | ||
22 | #include <asm/hardware.h> | |
23 | #include <asm/io.h> | |
24 | #include <asm/sizes.h> | |
25 | ||
26 | #include <asm/arch/at91rm9200.h> | |
27 | #include <asm/arch/board.h> | |
28 | #include <asm/arch/gpio.h> | |
29 | ||
30 | ||
31 | #define CF_SIZE 0x30000000 /* CS5+CS6: unavailable */ | |
32 | ||
33 | /* | |
34 | * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW; | |
35 | * some other bit in {A24,A22..A11} is nREG to flag memory access | |
36 | * (vs attributes). So more than 2KB/region would just be waste. | |
37 | */ | |
38 | #define CF_ATTR_PHYS (AT91_CF_BASE) | |
39 | #define CF_IO_PHYS (AT91_CF_BASE + (1 << 23)) | |
40 | #define CF_MEM_PHYS (AT91_CF_BASE + 0x017ff800) | |
41 | ||
42 | /*--------------------------------------------------------------------------*/ | |
43 | ||
44 | static const char driver_name[] = "at91_cf"; | |
45 | ||
46 | struct 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 | ||
55 | #define SZ_2K (2 * SZ_1K) | |
56 | ||
57 | static inline int at91_cf_present(struct at91_cf_socket *cf) | |
58 | { | |
59 | return !at91_get_gpio_value(cf->board->det_pin); | |
60 | } | |
61 | ||
62 | /*--------------------------------------------------------------------------*/ | |
63 | ||
64 | static int at91_cf_ss_init(struct pcmcia_socket *s) | |
65 | { | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r) | |
70 | { | |
71 | struct at91_cf_socket *cf = (struct at91_cf_socket *) _cf; | |
72 | ||
73 | if (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, present ? "present" : "gone"); | |
80 | pcmcia_parse_events(&cf->socket, SS_DETECT); | |
81 | } | |
82 | } | |
83 | ||
84 | return IRQ_HANDLED; | |
85 | } | |
86 | ||
87 | static 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: we assume 3VCARD, not XVCARD... */ | |
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 || at91_get_gpio_value(rdy)) | |
103 | *sp |= SS_READY; | |
104 | if (!vcc || at91_get_gpio_value(vcc)) | |
105 | *sp |= SS_POWERON; | |
106 | } else | |
107 | *sp = 0; | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static int at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) | |
113 | { | |
114 | struct at91_cf_socket *cf; | |
115 | ||
116 | cf = container_of(sock, struct at91_cf_socket, socket); | |
117 | ||
118 | /* switch Vcc if needed and possible */ | |
119 | if (cf->board->vcc_pin) { | |
120 | switch (s->Vcc) { | |
121 | case 0: | |
122 | at91_set_gpio_value(cf->board->vcc_pin, 0); | |
123 | break; | |
124 | case 33: | |
125 | at91_set_gpio_value(cf->board->vcc_pin, 1); | |
126 | break; | |
127 | default: | |
128 | return -EINVAL; | |
129 | } | |
130 | } | |
131 | ||
132 | /* toggle reset if needed */ | |
133 | at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET); | |
134 | ||
135 | pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", | |
136 | driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static int at91_cf_ss_suspend(struct pcmcia_socket *s) | |
142 | { | |
143 | return at91_cf_set_socket(s, &dead_socket); | |
144 | } | |
145 | ||
146 | /* we already mapped the I/O region */ | |
147 | static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) | |
148 | { | |
149 | struct at91_cf_socket *cf; | |
150 | u32 csr; | |
151 | ||
152 | cf = container_of(s, struct at91_cf_socket, socket); | |
153 | io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ); | |
154 | ||
155 | /* | |
156 | * Use 16 bit accesses unless/until we need 8-bit i/o space. | |
157 | * Always set CSR4 ... PCMCIA won't always unmap things. | |
158 | */ | |
159 | csr = at91_sys_read(AT91_SMC_CSR(4)) & ~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(4), 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 */ | |
187 | static int at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) | |
188 | { | |
189 | struct at91_cf_socket *cf; | |
190 | ||
191 | if (map->card_start) | |
192 | return -EINVAL; | |
193 | ||
194 | cf = container_of(s, struct at91_cf_socket, socket); | |
195 | ||
196 | map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; | |
197 | if (map->flags & MAP_ATTRIB) | |
198 | map->static_start = CF_ATTR_PHYS; | |
199 | else | |
200 | map->static_start = CF_MEM_PHYS; | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static struct pccard_operations at91_cf_ops = { | |
206 | .init = at91_cf_ss_init, | |
207 | .suspend = at91_cf_ss_suspend, | |
208 | .get_status = at91_cf_get_status, | |
209 | .set_socket = at91_cf_set_socket, | |
210 | .set_io_map = at91_cf_set_io_map, | |
211 | .set_mem_map = at91_cf_set_mem_map, | |
212 | }; | |
213 | ||
214 | /*--------------------------------------------------------------------------*/ | |
215 | ||
216 | static int __init at91_cf_probe(struct device *dev) | |
217 | { | |
218 | struct at91_cf_socket *cf; | |
219 | struct at91_cf_data *board = dev->platform_data; | |
220 | struct platform_device *pdev = to_platform_device(dev); | |
221 | unsigned int csa; | |
222 | int status; | |
223 | ||
224 | if (!board || !board->det_pin || !board->rst_pin) | |
225 | return -ENODEV; | |
226 | ||
227 | cf = kcalloc(1, sizeof *cf, GFP_KERNEL); | |
228 | if (!cf) | |
229 | return -ENOMEM; | |
230 | ||
231 | cf->board = board; | |
232 | cf->pdev = pdev; | |
233 | dev_set_drvdata(dev, cf); | |
234 | ||
235 | /* CF takes over CS4, CS5, CS6 */ | |
236 | csa = at91_sys_read(AT91_EBI_CSA); | |
237 | at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH); | |
238 | ||
239 | /* force poweron defaults for these pins ... */ | |
240 | (void) at91_set_A_periph(AT91_PIN_PC9, 0); /* A25/CFRNW */ | |
241 | (void) at91_set_A_periph(AT91_PIN_PC10, 0); /* NCS4/CFCS */ | |
242 | (void) at91_set_A_periph(AT91_PIN_PC11, 0); /* NCS5/CFCE1 */ | |
243 | (void) at91_set_A_periph(AT91_PIN_PC12, 0); /* NCS6/CFCE2 */ | |
244 | ||
245 | /* nWAIT is _not_ a default setting */ | |
246 | (void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */ | |
247 | ||
248 | /* | |
249 | * Static memory controller timing adjustments. | |
250 | * REVISIT: these timings are in terms of MCK cycles, so | |
251 | * when MCK changes (cpufreq etc) so must these values... | |
252 | */ | |
253 | at91_sys_write(AT91_SMC_CSR(4), AT91_SMC_ACSS_STD | AT91_SMC_DBW_16 | AT91_SMC_BAT | AT91_SMC_WSEN | |
254 | | AT91_SMC_NWS_(32) /* wait states */ | |
255 | | AT91_SMC_RWSETUP_(6) /* setup time */ | |
256 | | AT91_SMC_RWHOLD_(4) /* hold time */ | |
257 | ); | |
258 | ||
259 | /* must be a GPIO; ergo must trigger on both edges */ | |
260 | status = request_irq(board->det_pin, at91_cf_irq, | |
261 | SA_SAMPLE_RANDOM, driver_name, cf); | |
262 | if (status < 0) | |
263 | goto fail0; | |
264 | ||
265 | /* | |
266 | * The card driver will request this irq later as needed. | |
267 | * but it causes lots of "irqNN: nobody cared" messages | |
268 | * unless we report that we handle everything (sigh). | |
269 | * (Note: DK board doesn't wire the IRQ pin...) | |
270 | */ | |
271 | if (board->irq_pin) { | |
272 | status = request_irq(board->irq_pin, at91_cf_irq, | |
273 | SA_SHIRQ, driver_name, cf); | |
274 | if (status < 0) | |
275 | goto fail0a; | |
276 | cf->socket.pci_irq = board->irq_pin; | |
277 | } | |
278 | else | |
279 | cf->socket.pci_irq = NR_IRQS + 1; | |
280 | ||
281 | /* pcmcia layer only remaps "real" memory not iospace */ | |
282 | cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K); | |
283 | if (!cf->socket.io_offset) | |
284 | goto fail1; | |
285 | ||
286 | /* reserve CS4, CS5, and CS6 regions; but use just CS4 */ | |
287 | if (!request_mem_region(AT91_CF_BASE, CF_SIZE, driver_name)) | |
288 | goto fail1; | |
289 | ||
290 | pr_info("%s: irqs det #%d, io #%d\n", driver_name, | |
291 | board->det_pin, board->irq_pin); | |
292 | ||
293 | cf->socket.owner = THIS_MODULE; | |
294 | cf->socket.dev.dev = dev; | |
295 | cf->socket.ops = &at91_cf_ops; | |
296 | cf->socket.resource_ops = &pccard_static_ops; | |
297 | cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP | |
298 | | SS_CAP_MEM_ALIGN; | |
299 | cf->socket.map_size = SZ_2K; | |
300 | cf->socket.io[0].NumPorts = SZ_2K; | |
301 | ||
302 | status = pcmcia_register_socket(&cf->socket); | |
303 | if (status < 0) | |
304 | goto fail2; | |
305 | ||
306 | return 0; | |
307 | ||
308 | fail2: | |
309 | iounmap((void __iomem *) cf->socket.io_offset); | |
310 | release_mem_region(AT91_CF_BASE, CF_SIZE); | |
311 | fail1: | |
312 | if (board->irq_pin) | |
313 | free_irq(board->irq_pin, cf); | |
314 | fail0a: | |
315 | free_irq(board->det_pin, cf); | |
316 | fail0: | |
317 | at91_sys_write(AT91_EBI_CSA, csa); | |
318 | kfree(cf); | |
319 | return status; | |
320 | } | |
321 | ||
322 | static int __exit at91_cf_remove(struct device *dev) | |
323 | { | |
324 | struct at91_cf_socket *cf = dev_get_drvdata(dev); | |
325 | unsigned int csa; | |
326 | ||
327 | pcmcia_unregister_socket(&cf->socket); | |
328 | free_irq(cf->board->irq_pin, cf); | |
329 | free_irq(cf->board->det_pin, cf); | |
330 | iounmap((void __iomem *) cf->socket.io_offset); | |
331 | release_mem_region(AT91_CF_BASE, CF_SIZE); | |
332 | ||
333 | csa = at91_sys_read(AT91_EBI_CSA); | |
334 | at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A); | |
335 | ||
336 | kfree(cf); | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static struct device_driver at91_cf_driver = { | |
341 | .name = (char *) driver_name, | |
342 | .bus = &platform_bus_type, | |
343 | .probe = at91_cf_probe, | |
344 | .remove = __exit_p(at91_cf_remove), | |
345 | .suspend = pcmcia_socket_dev_suspend, | |
346 | .resume = pcmcia_socket_dev_resume, | |
347 | }; | |
348 | ||
349 | /*--------------------------------------------------------------------------*/ | |
350 | ||
351 | static int __init at91_cf_init(void) | |
352 | { | |
353 | return driver_register(&at91_cf_driver); | |
354 | } | |
355 | module_init(at91_cf_init); | |
356 | ||
357 | static void __exit at91_cf_exit(void) | |
358 | { | |
359 | driver_unregister(&at91_cf_driver); | |
360 | } | |
361 | module_exit(at91_cf_exit); | |
362 | ||
363 | MODULE_DESCRIPTION("AT91 Compact Flash Driver"); | |
364 | MODULE_AUTHOR("David Brownell"); | |
365 | MODULE_LICENSE("GPL"); |