Commit | Line | Data |
---|---|---|
0931a4c6 DB |
1 | /* |
2 | * dm355evm_msp.c - driver for MSP430 firmware on DM355EVM board | |
3 | * | |
4 | * Copyright (C) 2008 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/init.h> | |
13 | #include <linux/mutex.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/clk.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/gpio.h> | |
18 | #include <linux/leds.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/i2c/dm355evm_msp.h> | |
21 | ||
22 | ||
23 | /* | |
24 | * The DM355 is a DaVinci chip with video support but no C64+ DSP. Its | |
25 | * EVM board has an MSP430 programmed with firmware for various board | |
26 | * support functions. This driver exposes some of them directly, and | |
27 | * supports other drivers (e.g. RTC, input) for more complex access. | |
28 | * | |
29 | * Because this firmware is entirely board-specific, this file embeds | |
30 | * knowledge that would be passed as platform_data in a generic driver. | |
31 | * | |
32 | * This driver was tested with firmware revision A4. | |
33 | */ | |
34 | ||
00b8ac40 | 35 | #if defined(CONFIG_INPUT_DM355EVM) || defined(CONFIG_INPUT_DM355EVM_MODULE) |
0931a4c6 DB |
36 | #define msp_has_keyboard() true |
37 | #else | |
38 | #define msp_has_keyboard() false | |
39 | #endif | |
40 | ||
41 | #if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE) | |
42 | #define msp_has_leds() true | |
43 | #else | |
44 | #define msp_has_leds() false | |
45 | #endif | |
46 | ||
47 | #if defined(CONFIG_RTC_DRV_DM355EVM) || defined(CONFIG_RTC_DRV_DM355EVM_MODULE) | |
48 | #define msp_has_rtc() true | |
49 | #else | |
50 | #define msp_has_rtc() false | |
51 | #endif | |
52 | ||
53 | #if defined(CONFIG_VIDEO_TVP514X) || defined(CONFIG_VIDEO_TVP514X_MODULE) | |
54 | #define msp_has_tvp() true | |
55 | #else | |
56 | #define msp_has_tvp() false | |
57 | #endif | |
58 | ||
59 | ||
60 | /*----------------------------------------------------------------------*/ | |
61 | ||
62 | /* REVISIT for paranoia's sake, retry reads/writes on error */ | |
63 | ||
64 | static struct i2c_client *msp430; | |
65 | ||
66 | /** | |
67 | * dm355evm_msp_write - Writes a register in dm355evm_msp | |
68 | * @value: the value to be written | |
69 | * @reg: register address | |
70 | * | |
71 | * Returns result of operation - 0 is success, else negative errno | |
72 | */ | |
73 | int dm355evm_msp_write(u8 value, u8 reg) | |
74 | { | |
75 | return i2c_smbus_write_byte_data(msp430, reg, value); | |
76 | } | |
77 | EXPORT_SYMBOL(dm355evm_msp_write); | |
78 | ||
79 | /** | |
80 | * dm355evm_msp_read - Reads a register from dm355evm_msp | |
81 | * @reg: register address | |
82 | * | |
83 | * Returns result of operation - value, or negative errno | |
84 | */ | |
85 | int dm355evm_msp_read(u8 reg) | |
86 | { | |
87 | return i2c_smbus_read_byte_data(msp430, reg); | |
88 | } | |
89 | EXPORT_SYMBOL(dm355evm_msp_read); | |
90 | ||
91 | /*----------------------------------------------------------------------*/ | |
92 | ||
93 | /* | |
94 | * Many of the msp430 pins are just used as fixed-direction GPIOs. | |
95 | * We could export a few more of them this way, if we wanted. | |
96 | */ | |
97 | #define MSP_GPIO(bit,reg) ((DM355EVM_MSP_ ## reg) << 3 | (bit)) | |
98 | ||
99 | static const u8 msp_gpios[] = { | |
100 | /* eight leds */ | |
101 | MSP_GPIO(0, LED), MSP_GPIO(1, LED), | |
102 | MSP_GPIO(2, LED), MSP_GPIO(3, LED), | |
103 | MSP_GPIO(4, LED), MSP_GPIO(5, LED), | |
104 | MSP_GPIO(6, LED), MSP_GPIO(7, LED), | |
105 | /* SW6 and the NTSC/nPAL jumper */ | |
106 | MSP_GPIO(0, SWITCH1), MSP_GPIO(1, SWITCH1), | |
107 | MSP_GPIO(2, SWITCH1), MSP_GPIO(3, SWITCH1), | |
108 | MSP_GPIO(4, SWITCH1), | |
d1fdb4f6 | 109 | /* switches on MMC/SD sockets */ |
89a99e76 VB |
110 | /* |
111 | * Note: EVMDM355_ECP_VA4.pdf suggests that Bit 2 and 4 should be | |
112 | * checked for card detection. However on the EVM bit 1 and 3 gives | |
113 | * this status, for 0 and 1 instance respectively. The pdf also | |
114 | * suggests that Bit 1 and 3 should be checked for write protection. | |
115 | * However on the EVM bit 2 and 4 gives this status,for 0 and 1 | |
116 | * instance respectively. | |
117 | */ | |
118 | MSP_GPIO(2, SDMMC), MSP_GPIO(1, SDMMC), /* mmc0 WP, nCD */ | |
119 | MSP_GPIO(4, SDMMC), MSP_GPIO(3, SDMMC), /* mmc1 WP, nCD */ | |
0931a4c6 DB |
120 | }; |
121 | ||
122 | #define MSP_GPIO_REG(offset) (msp_gpios[(offset)] >> 3) | |
123 | #define MSP_GPIO_MASK(offset) BIT(msp_gpios[(offset)] & 0x07) | |
124 | ||
125 | static int msp_gpio_in(struct gpio_chip *chip, unsigned offset) | |
126 | { | |
127 | switch (MSP_GPIO_REG(offset)) { | |
128 | case DM355EVM_MSP_SWITCH1: | |
129 | case DM355EVM_MSP_SWITCH2: | |
130 | case DM355EVM_MSP_SDMMC: | |
131 | return 0; | |
132 | default: | |
133 | return -EINVAL; | |
134 | } | |
135 | } | |
136 | ||
137 | static u8 msp_led_cache; | |
138 | ||
139 | static int msp_gpio_get(struct gpio_chip *chip, unsigned offset) | |
140 | { | |
141 | int reg, status; | |
142 | ||
143 | reg = MSP_GPIO_REG(offset); | |
144 | status = dm355evm_msp_read(reg); | |
145 | if (status < 0) | |
146 | return status; | |
147 | if (reg == DM355EVM_MSP_LED) | |
148 | msp_led_cache = status; | |
149 | return status & MSP_GPIO_MASK(offset); | |
150 | } | |
151 | ||
152 | static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value) | |
153 | { | |
154 | int mask, bits; | |
155 | ||
156 | /* NOTE: there are some other signals that could be | |
157 | * packaged as output GPIOs, but they aren't as useful | |
158 | * as the LEDs ... so for now we don't. | |
159 | */ | |
160 | if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED) | |
161 | return -EINVAL; | |
162 | ||
163 | mask = MSP_GPIO_MASK(offset); | |
164 | bits = msp_led_cache; | |
165 | ||
166 | bits &= ~mask; | |
167 | if (value) | |
168 | bits |= mask; | |
169 | msp_led_cache = bits; | |
170 | ||
171 | return dm355evm_msp_write(bits, DM355EVM_MSP_LED); | |
172 | } | |
173 | ||
174 | static void msp_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
175 | { | |
176 | msp_gpio_out(chip, offset, value); | |
177 | } | |
178 | ||
179 | static struct gpio_chip dm355evm_msp_gpio = { | |
180 | .label = "dm355evm_msp", | |
181 | .owner = THIS_MODULE, | |
182 | .direction_input = msp_gpio_in, | |
183 | .get = msp_gpio_get, | |
184 | .direction_output = msp_gpio_out, | |
185 | .set = msp_gpio_set, | |
186 | .base = -EINVAL, /* dynamic assignment */ | |
187 | .ngpio = ARRAY_SIZE(msp_gpios), | |
188 | .can_sleep = true, | |
189 | }; | |
190 | ||
191 | /*----------------------------------------------------------------------*/ | |
192 | ||
193 | static struct device *add_child(struct i2c_client *client, const char *name, | |
194 | void *pdata, unsigned pdata_len, | |
195 | bool can_wakeup, int irq) | |
196 | { | |
197 | struct platform_device *pdev; | |
198 | int status; | |
199 | ||
200 | pdev = platform_device_alloc(name, -1); | |
201 | if (!pdev) { | |
202 | dev_dbg(&client->dev, "can't alloc dev\n"); | |
203 | status = -ENOMEM; | |
204 | goto err; | |
205 | } | |
206 | ||
207 | device_init_wakeup(&pdev->dev, can_wakeup); | |
208 | pdev->dev.parent = &client->dev; | |
209 | ||
210 | if (pdata) { | |
211 | status = platform_device_add_data(pdev, pdata, pdata_len); | |
212 | if (status < 0) { | |
213 | dev_dbg(&pdev->dev, "can't add platform_data\n"); | |
214 | goto err; | |
215 | } | |
216 | } | |
217 | ||
218 | if (irq) { | |
219 | struct resource r = { | |
220 | .start = irq, | |
221 | .flags = IORESOURCE_IRQ, | |
222 | }; | |
223 | ||
224 | status = platform_device_add_resources(pdev, &r, 1); | |
225 | if (status < 0) { | |
226 | dev_dbg(&pdev->dev, "can't add irq\n"); | |
227 | goto err; | |
228 | } | |
229 | } | |
230 | ||
231 | status = platform_device_add(pdev); | |
232 | ||
233 | err: | |
234 | if (status < 0) { | |
235 | platform_device_put(pdev); | |
236 | dev_err(&client->dev, "can't add %s dev\n", name); | |
237 | return ERR_PTR(status); | |
238 | } | |
239 | return &pdev->dev; | |
240 | } | |
241 | ||
242 | static int add_children(struct i2c_client *client) | |
243 | { | |
244 | static const struct { | |
245 | int offset; | |
246 | char *label; | |
247 | } config_inputs[] = { | |
248 | /* 8 == right after the LEDs */ | |
249 | { 8 + 0, "sw6_1", }, | |
250 | { 8 + 1, "sw6_2", }, | |
251 | { 8 + 2, "sw6_3", }, | |
252 | { 8 + 3, "sw6_4", }, | |
253 | { 8 + 4, "NTSC/nPAL", }, | |
254 | }; | |
255 | ||
256 | struct device *child; | |
257 | int status; | |
258 | int i; | |
259 | ||
260 | /* GPIO-ish stuff */ | |
261 | dm355evm_msp_gpio.dev = &client->dev; | |
262 | status = gpiochip_add(&dm355evm_msp_gpio); | |
263 | if (status < 0) | |
264 | return status; | |
265 | ||
266 | /* LED output */ | |
267 | if (msp_has_leds()) { | |
268 | #define GPIO_LED(l) .name = l, .active_low = true | |
269 | static struct gpio_led evm_leds[] = { | |
270 | { GPIO_LED("dm355evm::ds14"), | |
271 | .default_trigger = "heartbeat", }, | |
272 | { GPIO_LED("dm355evm::ds15"), | |
273 | .default_trigger = "mmc0", }, | |
274 | { GPIO_LED("dm355evm::ds16"), | |
275 | /* could also be a CE-ATA drive */ | |
276 | .default_trigger = "mmc1", }, | |
277 | { GPIO_LED("dm355evm::ds17"), | |
278 | .default_trigger = "nand-disk", }, | |
279 | { GPIO_LED("dm355evm::ds18"), }, | |
280 | { GPIO_LED("dm355evm::ds19"), }, | |
281 | { GPIO_LED("dm355evm::ds20"), }, | |
282 | { GPIO_LED("dm355evm::ds21"), }, | |
283 | }; | |
284 | #undef GPIO_LED | |
285 | ||
286 | struct gpio_led_platform_data evm_led_data = { | |
287 | .num_leds = ARRAY_SIZE(evm_leds), | |
288 | .leds = evm_leds, | |
289 | }; | |
290 | ||
291 | for (i = 0; i < ARRAY_SIZE(evm_leds); i++) | |
292 | evm_leds[i].gpio = i + dm355evm_msp_gpio.base; | |
293 | ||
294 | /* NOTE: these are the only fully programmable LEDs | |
295 | * on the board, since GPIO-61/ds22 (and many signals | |
296 | * going to DC7) must be used for AEMIF address lines | |
297 | * unless the top 1 GB of NAND is unused... | |
298 | */ | |
299 | child = add_child(client, "leds-gpio", | |
300 | &evm_led_data, sizeof(evm_led_data), | |
301 | false, 0); | |
302 | if (IS_ERR(child)) | |
303 | return PTR_ERR(child); | |
304 | } | |
305 | ||
306 | /* configuration inputs */ | |
307 | for (i = 0; i < ARRAY_SIZE(config_inputs); i++) { | |
308 | int gpio = dm355evm_msp_gpio.base + config_inputs[i].offset; | |
309 | ||
310 | gpio_request(gpio, config_inputs[i].label); | |
311 | gpio_direction_input(gpio); | |
312 | ||
313 | /* make it easy for userspace to see these */ | |
314 | gpio_export(gpio, false); | |
315 | } | |
316 | ||
d1fdb4f6 DB |
317 | /* MMC/SD inputs -- right after the last config input */ |
318 | if (client->dev.platform_data) { | |
319 | void (*mmcsd_setup)(unsigned) = client->dev.platform_data; | |
320 | ||
321 | mmcsd_setup(dm355evm_msp_gpio.base + 8 + 5); | |
322 | } | |
323 | ||
0931a4c6 DB |
324 | /* RTC is a 32 bit counter, no alarm */ |
325 | if (msp_has_rtc()) { | |
326 | child = add_child(client, "rtc-dm355evm", | |
327 | NULL, 0, false, 0); | |
328 | if (IS_ERR(child)) | |
329 | return PTR_ERR(child); | |
330 | } | |
331 | ||
332 | /* input from buttons and IR remote (uses the IRQ) */ | |
333 | if (msp_has_keyboard()) { | |
334 | child = add_child(client, "dm355evm_keys", | |
335 | NULL, 0, true, client->irq); | |
336 | if (IS_ERR(child)) | |
337 | return PTR_ERR(child); | |
338 | } | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | /*----------------------------------------------------------------------*/ | |
344 | ||
345 | static void dm355evm_command(unsigned command) | |
346 | { | |
347 | int status; | |
348 | ||
349 | status = dm355evm_msp_write(command, DM355EVM_MSP_COMMAND); | |
350 | if (status < 0) | |
351 | dev_err(&msp430->dev, "command %d failure %d\n", | |
352 | command, status); | |
353 | } | |
354 | ||
355 | static void dm355evm_power_off(void) | |
356 | { | |
357 | dm355evm_command(MSP_COMMAND_POWEROFF); | |
358 | } | |
359 | ||
360 | static int dm355evm_msp_remove(struct i2c_client *client) | |
361 | { | |
362 | pm_power_off = NULL; | |
363 | msp430 = NULL; | |
364 | return 0; | |
365 | } | |
366 | ||
367 | static int | |
368 | dm355evm_msp_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
369 | { | |
370 | int status; | |
371 | const char *video = msp_has_tvp() ? "TVP5146" : "imager"; | |
372 | ||
373 | if (msp430) | |
374 | return -EBUSY; | |
375 | msp430 = client; | |
376 | ||
377 | /* display revision status; doubles as sanity check */ | |
378 | status = dm355evm_msp_read(DM355EVM_MSP_FIRMREV); | |
379 | if (status < 0) | |
380 | goto fail; | |
381 | dev_info(&client->dev, "firmware v.%02X, %s as video-in\n", | |
382 | status, video); | |
383 | ||
384 | /* mux video input: either tvp5146 or some external imager */ | |
385 | status = dm355evm_msp_write(msp_has_tvp() ? 0 : MSP_VIDEO_IMAGER, | |
386 | DM355EVM_MSP_VIDEO_IN); | |
387 | if (status < 0) | |
388 | dev_warn(&client->dev, "error %d muxing %s as video-in\n", | |
389 | status, video); | |
390 | ||
391 | /* init LED cache, and turn off the LEDs */ | |
392 | msp_led_cache = 0xff; | |
393 | dm355evm_msp_write(msp_led_cache, DM355EVM_MSP_LED); | |
394 | ||
395 | /* export capabilities we support */ | |
396 | status = add_children(client); | |
397 | if (status < 0) | |
398 | goto fail; | |
399 | ||
400 | /* PM hookup */ | |
401 | pm_power_off = dm355evm_power_off; | |
402 | ||
403 | return 0; | |
404 | ||
405 | fail: | |
406 | /* FIXME remove children ... */ | |
407 | dm355evm_msp_remove(client); | |
408 | return status; | |
409 | } | |
410 | ||
411 | static const struct i2c_device_id dm355evm_msp_ids[] = { | |
412 | { "dm355evm_msp", 0 }, | |
413 | { /* end of list */ }, | |
414 | }; | |
415 | MODULE_DEVICE_TABLE(i2c, dm355evm_msp_ids); | |
416 | ||
417 | static struct i2c_driver dm355evm_msp_driver = { | |
418 | .driver.name = "dm355evm_msp", | |
419 | .id_table = dm355evm_msp_ids, | |
420 | .probe = dm355evm_msp_probe, | |
421 | .remove = dm355evm_msp_remove, | |
422 | }; | |
423 | ||
424 | static int __init dm355evm_msp_init(void) | |
425 | { | |
426 | return i2c_add_driver(&dm355evm_msp_driver); | |
427 | } | |
428 | subsys_initcall(dm355evm_msp_init); | |
429 | ||
430 | static void __exit dm355evm_msp_exit(void) | |
431 | { | |
432 | i2c_del_driver(&dm355evm_msp_driver); | |
433 | } | |
434 | module_exit(dm355evm_msp_exit); | |
435 | ||
436 | MODULE_DESCRIPTION("Interface to MSP430 firmware on DM355EVM"); | |
437 | MODULE_LICENSE("GPL"); |