Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2c1f3b7a AV |
2 | /* |
3 | * at91_cf.c -- AT91 CompactFlash controller driver | |
4 | * | |
5 | * Copyright (C) 2005 David Brownell | |
2c1f3b7a AV |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/kernel.h> | |
2c1f3b7a AV |
10 | #include <linux/platform_device.h> |
11 | #include <linux/errno.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
80af9e6d | 15 | #include <linux/gpio.h> |
a843168d JE |
16 | #include <linux/io.h> |
17 | #include <linux/sizes.h> | |
eaa9a21d AB |
18 | #include <linux/mfd/syscon.h> |
19 | #include <linux/mfd/syscon/atmel-mc.h> | |
ed9084ec JE |
20 | #include <linux/of.h> |
21 | #include <linux/of_device.h> | |
22 | #include <linux/of_gpio.h> | |
eaa9a21d | 23 | #include <linux/regmap.h> |
2c1f3b7a AV |
24 | |
25 | #include <pcmcia/ss.h> | |
26 | ||
2c1f3b7a AV |
27 | /* |
28 | * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW; | |
29 | * some other bit in {A24,A22..A11} is nREG to flag memory access | |
30 | * (vs attributes). So more than 2KB/region would just be waste. | |
ebe5cfb3 | 31 | * Note: These are offsets from the physical base address. |
2c1f3b7a | 32 | */ |
ebe5cfb3 AV |
33 | #define CF_ATTR_PHYS (0) |
34 | #define CF_IO_PHYS (1 << 23) | |
35 | #define CF_MEM_PHYS (0x017ff800) | |
2c1f3b7a | 36 | |
24c8a743 AB |
37 | struct at91_cf_data { |
38 | int irq_pin; /* I/O IRQ */ | |
39 | int det_pin; /* Card detect */ | |
40 | int vcc_pin; /* power switching */ | |
41 | int rst_pin; /* card reset */ | |
42 | u8 chipselect; /* EBI Chip Select number */ | |
43 | u8 flags; | |
44 | #define AT91_CF_TRUE_IDE 0x01 | |
45 | #define AT91_IDE_SWAP_A0_A2 0x02 | |
46 | }; | |
47 | ||
eaa9a21d AB |
48 | struct regmap *mc; |
49 | ||
2c1f3b7a AV |
50 | /*--------------------------------------------------------------------------*/ |
51 | ||
2c1f3b7a AV |
52 | struct at91_cf_socket { |
53 | struct pcmcia_socket socket; | |
54 | ||
55 | unsigned present:1; | |
56 | ||
57 | struct platform_device *pdev; | |
58 | struct at91_cf_data *board; | |
ebe5cfb3 AV |
59 | |
60 | unsigned long phys_baseaddr; | |
2c1f3b7a AV |
61 | }; |
62 | ||
2c1f3b7a AV |
63 | static inline int at91_cf_present(struct at91_cf_socket *cf) |
64 | { | |
4c1fc445 | 65 | return !gpio_get_value(cf->board->det_pin); |
2c1f3b7a AV |
66 | } |
67 | ||
68 | /*--------------------------------------------------------------------------*/ | |
69 | ||
70 | static int at91_cf_ss_init(struct pcmcia_socket *s) | |
71 | { | |
72 | return 0; | |
73 | } | |
74 | ||
7d12e780 | 75 | static irqreturn_t at91_cf_irq(int irq, void *_cf) |
2c1f3b7a | 76 | { |
c7bec5ab | 77 | struct at91_cf_socket *cf = _cf; |
2c1f3b7a | 78 | |
80af9e6d | 79 | if (irq == gpio_to_irq(cf->board->det_pin)) { |
2c1f3b7a AV |
80 | unsigned present = at91_cf_present(cf); |
81 | ||
82 | /* kick pccard as needed */ | |
83 | if (present != cf->present) { | |
84 | cf->present = present; | |
40ca0209 | 85 | dev_dbg(&cf->pdev->dev, "card %s\n", |
2c536200 | 86 | present ? "present" : "gone"); |
2c1f3b7a AV |
87 | pcmcia_parse_events(&cf->socket, SS_DETECT); |
88 | } | |
89 | } | |
90 | ||
91 | return IRQ_HANDLED; | |
92 | } | |
93 | ||
94 | static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp) | |
95 | { | |
96 | struct at91_cf_socket *cf; | |
97 | ||
98 | if (!sp) | |
99 | return -EINVAL; | |
100 | ||
101 | cf = container_of(s, struct at91_cf_socket, socket); | |
102 | ||
2c536200 | 103 | /* NOTE: CF is always 3VCARD */ |
2c1f3b7a | 104 | if (at91_cf_present(cf)) { |
80af9e6d JE |
105 | int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */ |
106 | int vcc = gpio_is_valid(cf->board->vcc_pin); | |
2c1f3b7a AV |
107 | |
108 | *sp = SS_DETECT | SS_3VCARD; | |
e39506b4 | 109 | if (!rdy || gpio_get_value(cf->board->irq_pin)) |
2c1f3b7a | 110 | *sp |= SS_READY; |
e39506b4 | 111 | if (!vcc || gpio_get_value(cf->board->vcc_pin)) |
2c1f3b7a AV |
112 | *sp |= SS_POWERON; |
113 | } else | |
114 | *sp = 0; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
2c536200 DB |
119 | static int |
120 | at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) | |
2c1f3b7a AV |
121 | { |
122 | struct at91_cf_socket *cf; | |
123 | ||
124 | cf = container_of(sock, struct at91_cf_socket, socket); | |
125 | ||
126 | /* switch Vcc if needed and possible */ | |
80af9e6d | 127 | if (gpio_is_valid(cf->board->vcc_pin)) { |
2c1f3b7a | 128 | switch (s->Vcc) { |
d652f702 LN |
129 | case 0: |
130 | gpio_set_value(cf->board->vcc_pin, 0); | |
131 | break; | |
132 | case 33: | |
133 | gpio_set_value(cf->board->vcc_pin, 1); | |
134 | break; | |
135 | default: | |
136 | return -EINVAL; | |
2c1f3b7a AV |
137 | } |
138 | } | |
139 | ||
140 | /* toggle reset if needed */ | |
4c1fc445 | 141 | gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET); |
2c1f3b7a | 142 | |
40ca0209 JE |
143 | dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n", |
144 | s->Vcc, s->io_irq, s->flags, s->csc_mask); | |
2c1f3b7a AV |
145 | |
146 | return 0; | |
147 | } | |
148 | ||
149 | static int at91_cf_ss_suspend(struct pcmcia_socket *s) | |
150 | { | |
151 | return at91_cf_set_socket(s, &dead_socket); | |
152 | } | |
153 | ||
154 | /* we already mapped the I/O region */ | |
155 | static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) | |
156 | { | |
157 | struct at91_cf_socket *cf; | |
158 | u32 csr; | |
159 | ||
160 | cf = container_of(s, struct at91_cf_socket, socket); | |
161 | io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ); | |
162 | ||
163 | /* | |
164 | * Use 16 bit accesses unless/until we need 8-bit i/o space. | |
eaa9a21d | 165 | * |
2c1f3b7a AV |
166 | * NOTE: this CF controller ignores IOIS16, so we can't really do |
167 | * MAP_AUTOSZ. The 16bit mode allows single byte access on either | |
168 | * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many | |
169 | * purposes (and handles ide-cs). | |
170 | * | |
171 | * The 8bit mode is needed for odd byte access on D0-D7. It seems | |
172 | * some cards only like that way to get at the odd byte, despite | |
173 | * CF 3.0 spec table 35 also giving the D8-D15 option. | |
174 | */ | |
ebe5cfb3 | 175 | if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) { |
eaa9a21d | 176 | csr = AT91_MC_SMC_DBW_8; |
40ca0209 | 177 | dev_dbg(&cf->pdev->dev, "8bit i/o bus\n"); |
2c1f3b7a | 178 | } else { |
eaa9a21d | 179 | csr = AT91_MC_SMC_DBW_16; |
40ca0209 | 180 | dev_dbg(&cf->pdev->dev, "16bit i/o bus\n"); |
2c1f3b7a | 181 | } |
eaa9a21d AB |
182 | regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect), |
183 | AT91_MC_SMC_DBW, csr); | |
2c1f3b7a AV |
184 | |
185 | io->start = cf->socket.io_offset; | |
186 | io->stop = io->start + SZ_2K - 1; | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | /* pcmcia layer maps/unmaps mem regions */ | |
2c536200 DB |
192 | static int |
193 | at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) | |
2c1f3b7a AV |
194 | { |
195 | struct at91_cf_socket *cf; | |
196 | ||
197 | if (map->card_start) | |
198 | return -EINVAL; | |
199 | ||
200 | cf = container_of(s, struct at91_cf_socket, socket); | |
201 | ||
ebe5cfb3 | 202 | map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT); |
2c1f3b7a | 203 | if (map->flags & MAP_ATTRIB) |
ebe5cfb3 | 204 | map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS; |
2c1f3b7a | 205 | else |
ebe5cfb3 | 206 | map->static_start = cf->phys_baseaddr + CF_MEM_PHYS; |
2c1f3b7a AV |
207 | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static struct pccard_operations at91_cf_ops = { | |
212 | .init = at91_cf_ss_init, | |
213 | .suspend = at91_cf_ss_suspend, | |
214 | .get_status = at91_cf_get_status, | |
215 | .set_socket = at91_cf_set_socket, | |
216 | .set_io_map = at91_cf_set_io_map, | |
217 | .set_mem_map = at91_cf_set_mem_map, | |
218 | }; | |
219 | ||
220 | /*--------------------------------------------------------------------------*/ | |
221 | ||
ed9084ec JE |
222 | static const struct of_device_id at91_cf_dt_ids[] = { |
223 | { .compatible = "atmel,at91rm9200-cf" }, | |
224 | { /* sentinel */ } | |
225 | }; | |
226 | MODULE_DEVICE_TABLE(of, at91_cf_dt_ids); | |
227 | ||
264788c8 | 228 | static int at91_cf_probe(struct platform_device *pdev) |
ed9084ec | 229 | { |
264788c8 AB |
230 | struct at91_cf_socket *cf; |
231 | struct at91_cf_data *board; | |
232 | struct resource *io; | |
233 | int status; | |
ed9084ec JE |
234 | |
235 | board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL); | |
236 | if (!board) | |
237 | return -ENOMEM; | |
238 | ||
239 | board->irq_pin = of_get_gpio(pdev->dev.of_node, 0); | |
240 | board->det_pin = of_get_gpio(pdev->dev.of_node, 1); | |
241 | board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2); | |
242 | board->rst_pin = of_get_gpio(pdev->dev.of_node, 3); | |
243 | ||
eaa9a21d | 244 | mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc"); |
264788c8 AB |
245 | if (IS_ERR(mc)) |
246 | return PTR_ERR(mc); | |
ed9084ec JE |
247 | |
248 | if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin)) | |
2c1f3b7a AV |
249 | return -ENODEV; |
250 | ||
2c536200 DB |
251 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
252 | if (!io) | |
253 | return -ENODEV; | |
254 | ||
54fe1591 | 255 | cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL); |
2c1f3b7a AV |
256 | if (!cf) |
257 | return -ENOMEM; | |
258 | ||
259 | cf->board = board; | |
260 | cf->pdev = pdev; | |
ebe5cfb3 | 261 | cf->phys_baseaddr = io->start; |
0db6095d | 262 | platform_set_drvdata(pdev, cf); |
2c1f3b7a | 263 | |
2c1f3b7a | 264 | /* must be a GPIO; ergo must trigger on both edges */ |
54fe1591 | 265 | status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det"); |
2c1f3b7a | 266 | if (status < 0) |
54fe1591 JE |
267 | return status; |
268 | ||
269 | status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin), | |
270 | at91_cf_irq, 0, "at91_cf detect", cf); | |
4c1fc445 | 271 | if (status < 0) |
54fe1591 JE |
272 | return status; |
273 | ||
0db6095d | 274 | device_init_wakeup(&pdev->dev, 1); |
2c1f3b7a | 275 | |
54fe1591 | 276 | status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst"); |
4c1fc445 DB |
277 | if (status < 0) |
278 | goto fail0a; | |
279 | ||
80af9e6d | 280 | if (gpio_is_valid(board->vcc_pin)) { |
54fe1591 | 281 | status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc"); |
4c1fc445 | 282 | if (status < 0) |
54fe1591 | 283 | goto fail0a; |
4c1fc445 DB |
284 | } |
285 | ||
2c1f3b7a AV |
286 | /* |
287 | * The card driver will request this irq later as needed. | |
288 | * but it causes lots of "irqNN: nobody cared" messages | |
289 | * unless we report that we handle everything (sigh). | |
290 | * (Note: DK board doesn't wire the IRQ pin...) | |
291 | */ | |
80af9e6d | 292 | if (gpio_is_valid(board->irq_pin)) { |
54fe1591 | 293 | status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq"); |
4c1fc445 | 294 | if (status < 0) |
54fe1591 JE |
295 | goto fail0a; |
296 | ||
297 | status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin), | |
298 | at91_cf_irq, IRQF_SHARED, "at91_cf", cf); | |
2c1f3b7a | 299 | if (status < 0) |
54fe1591 | 300 | goto fail0a; |
80af9e6d | 301 | cf->socket.pci_irq = gpio_to_irq(board->irq_pin); |
2c536200 | 302 | } else |
9130adda | 303 | cf->socket.pci_irq = nr_irqs + 1; |
2c1f3b7a | 304 | |
1be27c62 AB |
305 | /* |
306 | * pcmcia layer only remaps "real" memory not iospace | |
307 | * io_offset is set to 0x10000 to avoid the check in static_find_io(). | |
308 | * */ | |
309 | cf->socket.io_offset = 0x10000; | |
310 | status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS); | |
311 | if (status) | |
54fe1591 | 312 | goto fail0a; |
2c1f3b7a | 313 | |
40a0017e | 314 | /* reserve chip-select regions */ |
54fe1591 | 315 | if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) { |
ebe5cfb3 | 316 | status = -ENXIO; |
54fe1591 | 317 | goto fail0a; |
ebe5cfb3 | 318 | } |
2c1f3b7a | 319 | |
40ca0209 | 320 | dev_info(&pdev->dev, "irqs det #%d, io #%d\n", |
80af9e6d | 321 | gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin)); |
2c1f3b7a AV |
322 | |
323 | cf->socket.owner = THIS_MODULE; | |
e4a3c3f0 | 324 | cf->socket.dev.parent = &pdev->dev; |
2c1f3b7a AV |
325 | cf->socket.ops = &at91_cf_ops; |
326 | cf->socket.resource_ops = &pccard_static_ops; | |
327 | cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP | |
328 | | SS_CAP_MEM_ALIGN; | |
329 | cf->socket.map_size = SZ_2K; | |
2c536200 | 330 | cf->socket.io[0].res = io; |
2c1f3b7a AV |
331 | |
332 | status = pcmcia_register_socket(&cf->socket); | |
333 | if (status < 0) | |
54fe1591 | 334 | goto fail0a; |
2c1f3b7a AV |
335 | |
336 | return 0; | |
337 | ||
2c1f3b7a | 338 | fail0a: |
1fbece15 | 339 | device_init_wakeup(&pdev->dev, 0); |
2c1f3b7a AV |
340 | return status; |
341 | } | |
342 | ||
16a7c7cf | 343 | static int at91_cf_remove(struct platform_device *pdev) |
2c1f3b7a | 344 | { |
0db6095d | 345 | struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
2c1f3b7a AV |
346 | |
347 | pcmcia_unregister_socket(&cf->socket); | |
0db6095d | 348 | device_init_wakeup(&pdev->dev, 0); |
54fe1591 | 349 | |
2c1f3b7a AV |
350 | return 0; |
351 | } | |
352 | ||
0db6095d DB |
353 | #ifdef CONFIG_PM |
354 | ||
355 | static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg) | |
356 | { | |
357 | struct at91_cf_socket *cf = platform_get_drvdata(pdev); | |
358 | struct at91_cf_data *board = cf->board; | |
359 | ||
1fbece15 | 360 | if (device_may_wakeup(&pdev->dev)) { |
80af9e6d JE |
361 | enable_irq_wake(gpio_to_irq(board->det_pin)); |
362 | if (gpio_is_valid(board->irq_pin)) | |
363 | enable_irq_wake(gpio_to_irq(board->irq_pin)); | |
0db6095d | 364 | } |
0db6095d DB |
365 | return 0; |
366 | } | |
367 | ||
368 | static int at91_cf_resume(struct platform_device *pdev) | |
369 | { | |
9af20376 MP |
370 | struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
371 | struct at91_cf_data *board = cf->board; | |
372 | ||
373 | if (device_may_wakeup(&pdev->dev)) { | |
80af9e6d JE |
374 | disable_irq_wake(gpio_to_irq(board->det_pin)); |
375 | if (gpio_is_valid(board->irq_pin)) | |
376 | disable_irq_wake(gpio_to_irq(board->irq_pin)); | |
9af20376 MP |
377 | } |
378 | ||
0db6095d DB |
379 | return 0; |
380 | } | |
381 | ||
382 | #else | |
383 | #define at91_cf_suspend NULL | |
384 | #define at91_cf_resume NULL | |
385 | #endif | |
386 | ||
387 | static struct platform_driver at91_cf_driver = { | |
388 | .driver = { | |
40ca0209 | 389 | .name = "at91_cf", |
264788c8 | 390 | .of_match_table = at91_cf_dt_ids, |
0db6095d | 391 | }, |
16a7c7cf JH |
392 | .probe = at91_cf_probe, |
393 | .remove = at91_cf_remove, | |
0db6095d DB |
394 | .suspend = at91_cf_suspend, |
395 | .resume = at91_cf_resume, | |
2c1f3b7a AV |
396 | }; |
397 | ||
16a7c7cf | 398 | module_platform_driver(at91_cf_driver); |
2c1f3b7a AV |
399 | |
400 | MODULE_DESCRIPTION("AT91 Compact Flash Driver"); | |
401 | MODULE_AUTHOR("David Brownell"); | |
402 | MODULE_LICENSE("GPL"); | |
12c2c019 | 403 | MODULE_ALIAS("platform:at91_cf"); |