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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 DB |
109 | /* switches on MMC/SD sockets */ |
110 | MSP_GPIO(1, SDMMC), MSP_GPIO(2, SDMMC), /* mmc0 WP, nCD */ | |
111 | MSP_GPIO(3, SDMMC), MSP_GPIO(4, SDMMC), /* mmc1 WP, nCD */ | |
0931a4c6 DB |
112 | }; |
113 | ||
114 | #define MSP_GPIO_REG(offset) (msp_gpios[(offset)] >> 3) | |
115 | #define MSP_GPIO_MASK(offset) BIT(msp_gpios[(offset)] & 0x07) | |
116 | ||
117 | static int msp_gpio_in(struct gpio_chip *chip, unsigned offset) | |
118 | { | |
119 | switch (MSP_GPIO_REG(offset)) { | |
120 | case DM355EVM_MSP_SWITCH1: | |
121 | case DM355EVM_MSP_SWITCH2: | |
122 | case DM355EVM_MSP_SDMMC: | |
123 | return 0; | |
124 | default: | |
125 | return -EINVAL; | |
126 | } | |
127 | } | |
128 | ||
129 | static u8 msp_led_cache; | |
130 | ||
131 | static int msp_gpio_get(struct gpio_chip *chip, unsigned offset) | |
132 | { | |
133 | int reg, status; | |
134 | ||
135 | reg = MSP_GPIO_REG(offset); | |
136 | status = dm355evm_msp_read(reg); | |
137 | if (status < 0) | |
138 | return status; | |
139 | if (reg == DM355EVM_MSP_LED) | |
140 | msp_led_cache = status; | |
141 | return status & MSP_GPIO_MASK(offset); | |
142 | } | |
143 | ||
144 | static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value) | |
145 | { | |
146 | int mask, bits; | |
147 | ||
148 | /* NOTE: there are some other signals that could be | |
149 | * packaged as output GPIOs, but they aren't as useful | |
150 | * as the LEDs ... so for now we don't. | |
151 | */ | |
152 | if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED) | |
153 | return -EINVAL; | |
154 | ||
155 | mask = MSP_GPIO_MASK(offset); | |
156 | bits = msp_led_cache; | |
157 | ||
158 | bits &= ~mask; | |
159 | if (value) | |
160 | bits |= mask; | |
161 | msp_led_cache = bits; | |
162 | ||
163 | return dm355evm_msp_write(bits, DM355EVM_MSP_LED); | |
164 | } | |
165 | ||
166 | static void msp_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
167 | { | |
168 | msp_gpio_out(chip, offset, value); | |
169 | } | |
170 | ||
171 | static struct gpio_chip dm355evm_msp_gpio = { | |
172 | .label = "dm355evm_msp", | |
173 | .owner = THIS_MODULE, | |
174 | .direction_input = msp_gpio_in, | |
175 | .get = msp_gpio_get, | |
176 | .direction_output = msp_gpio_out, | |
177 | .set = msp_gpio_set, | |
178 | .base = -EINVAL, /* dynamic assignment */ | |
179 | .ngpio = ARRAY_SIZE(msp_gpios), | |
180 | .can_sleep = true, | |
181 | }; | |
182 | ||
183 | /*----------------------------------------------------------------------*/ | |
184 | ||
185 | static struct device *add_child(struct i2c_client *client, const char *name, | |
186 | void *pdata, unsigned pdata_len, | |
187 | bool can_wakeup, int irq) | |
188 | { | |
189 | struct platform_device *pdev; | |
190 | int status; | |
191 | ||
192 | pdev = platform_device_alloc(name, -1); | |
193 | if (!pdev) { | |
194 | dev_dbg(&client->dev, "can't alloc dev\n"); | |
195 | status = -ENOMEM; | |
196 | goto err; | |
197 | } | |
198 | ||
199 | device_init_wakeup(&pdev->dev, can_wakeup); | |
200 | pdev->dev.parent = &client->dev; | |
201 | ||
202 | if (pdata) { | |
203 | status = platform_device_add_data(pdev, pdata, pdata_len); | |
204 | if (status < 0) { | |
205 | dev_dbg(&pdev->dev, "can't add platform_data\n"); | |
206 | goto err; | |
207 | } | |
208 | } | |
209 | ||
210 | if (irq) { | |
211 | struct resource r = { | |
212 | .start = irq, | |
213 | .flags = IORESOURCE_IRQ, | |
214 | }; | |
215 | ||
216 | status = platform_device_add_resources(pdev, &r, 1); | |
217 | if (status < 0) { | |
218 | dev_dbg(&pdev->dev, "can't add irq\n"); | |
219 | goto err; | |
220 | } | |
221 | } | |
222 | ||
223 | status = platform_device_add(pdev); | |
224 | ||
225 | err: | |
226 | if (status < 0) { | |
227 | platform_device_put(pdev); | |
228 | dev_err(&client->dev, "can't add %s dev\n", name); | |
229 | return ERR_PTR(status); | |
230 | } | |
231 | return &pdev->dev; | |
232 | } | |
233 | ||
234 | static int add_children(struct i2c_client *client) | |
235 | { | |
236 | static const struct { | |
237 | int offset; | |
238 | char *label; | |
239 | } config_inputs[] = { | |
240 | /* 8 == right after the LEDs */ | |
241 | { 8 + 0, "sw6_1", }, | |
242 | { 8 + 1, "sw6_2", }, | |
243 | { 8 + 2, "sw6_3", }, | |
244 | { 8 + 3, "sw6_4", }, | |
245 | { 8 + 4, "NTSC/nPAL", }, | |
246 | }; | |
247 | ||
248 | struct device *child; | |
249 | int status; | |
250 | int i; | |
251 | ||
252 | /* GPIO-ish stuff */ | |
253 | dm355evm_msp_gpio.dev = &client->dev; | |
254 | status = gpiochip_add(&dm355evm_msp_gpio); | |
255 | if (status < 0) | |
256 | return status; | |
257 | ||
258 | /* LED output */ | |
259 | if (msp_has_leds()) { | |
260 | #define GPIO_LED(l) .name = l, .active_low = true | |
261 | static struct gpio_led evm_leds[] = { | |
262 | { GPIO_LED("dm355evm::ds14"), | |
263 | .default_trigger = "heartbeat", }, | |
264 | { GPIO_LED("dm355evm::ds15"), | |
265 | .default_trigger = "mmc0", }, | |
266 | { GPIO_LED("dm355evm::ds16"), | |
267 | /* could also be a CE-ATA drive */ | |
268 | .default_trigger = "mmc1", }, | |
269 | { GPIO_LED("dm355evm::ds17"), | |
270 | .default_trigger = "nand-disk", }, | |
271 | { GPIO_LED("dm355evm::ds18"), }, | |
272 | { GPIO_LED("dm355evm::ds19"), }, | |
273 | { GPIO_LED("dm355evm::ds20"), }, | |
274 | { GPIO_LED("dm355evm::ds21"), }, | |
275 | }; | |
276 | #undef GPIO_LED | |
277 | ||
278 | struct gpio_led_platform_data evm_led_data = { | |
279 | .num_leds = ARRAY_SIZE(evm_leds), | |
280 | .leds = evm_leds, | |
281 | }; | |
282 | ||
283 | for (i = 0; i < ARRAY_SIZE(evm_leds); i++) | |
284 | evm_leds[i].gpio = i + dm355evm_msp_gpio.base; | |
285 | ||
286 | /* NOTE: these are the only fully programmable LEDs | |
287 | * on the board, since GPIO-61/ds22 (and many signals | |
288 | * going to DC7) must be used for AEMIF address lines | |
289 | * unless the top 1 GB of NAND is unused... | |
290 | */ | |
291 | child = add_child(client, "leds-gpio", | |
292 | &evm_led_data, sizeof(evm_led_data), | |
293 | false, 0); | |
294 | if (IS_ERR(child)) | |
295 | return PTR_ERR(child); | |
296 | } | |
297 | ||
298 | /* configuration inputs */ | |
299 | for (i = 0; i < ARRAY_SIZE(config_inputs); i++) { | |
300 | int gpio = dm355evm_msp_gpio.base + config_inputs[i].offset; | |
301 | ||
302 | gpio_request(gpio, config_inputs[i].label); | |
303 | gpio_direction_input(gpio); | |
304 | ||
305 | /* make it easy for userspace to see these */ | |
306 | gpio_export(gpio, false); | |
307 | } | |
308 | ||
d1fdb4f6 DB |
309 | /* MMC/SD inputs -- right after the last config input */ |
310 | if (client->dev.platform_data) { | |
311 | void (*mmcsd_setup)(unsigned) = client->dev.platform_data; | |
312 | ||
313 | mmcsd_setup(dm355evm_msp_gpio.base + 8 + 5); | |
314 | } | |
315 | ||
0931a4c6 DB |
316 | /* RTC is a 32 bit counter, no alarm */ |
317 | if (msp_has_rtc()) { | |
318 | child = add_child(client, "rtc-dm355evm", | |
319 | NULL, 0, false, 0); | |
320 | if (IS_ERR(child)) | |
321 | return PTR_ERR(child); | |
322 | } | |
323 | ||
324 | /* input from buttons and IR remote (uses the IRQ) */ | |
325 | if (msp_has_keyboard()) { | |
326 | child = add_child(client, "dm355evm_keys", | |
327 | NULL, 0, true, client->irq); | |
328 | if (IS_ERR(child)) | |
329 | return PTR_ERR(child); | |
330 | } | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | /*----------------------------------------------------------------------*/ | |
336 | ||
337 | static void dm355evm_command(unsigned command) | |
338 | { | |
339 | int status; | |
340 | ||
341 | status = dm355evm_msp_write(command, DM355EVM_MSP_COMMAND); | |
342 | if (status < 0) | |
343 | dev_err(&msp430->dev, "command %d failure %d\n", | |
344 | command, status); | |
345 | } | |
346 | ||
347 | static void dm355evm_power_off(void) | |
348 | { | |
349 | dm355evm_command(MSP_COMMAND_POWEROFF); | |
350 | } | |
351 | ||
352 | static int dm355evm_msp_remove(struct i2c_client *client) | |
353 | { | |
354 | pm_power_off = NULL; | |
355 | msp430 = NULL; | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static int | |
360 | dm355evm_msp_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
361 | { | |
362 | int status; | |
363 | const char *video = msp_has_tvp() ? "TVP5146" : "imager"; | |
364 | ||
365 | if (msp430) | |
366 | return -EBUSY; | |
367 | msp430 = client; | |
368 | ||
369 | /* display revision status; doubles as sanity check */ | |
370 | status = dm355evm_msp_read(DM355EVM_MSP_FIRMREV); | |
371 | if (status < 0) | |
372 | goto fail; | |
373 | dev_info(&client->dev, "firmware v.%02X, %s as video-in\n", | |
374 | status, video); | |
375 | ||
376 | /* mux video input: either tvp5146 or some external imager */ | |
377 | status = dm355evm_msp_write(msp_has_tvp() ? 0 : MSP_VIDEO_IMAGER, | |
378 | DM355EVM_MSP_VIDEO_IN); | |
379 | if (status < 0) | |
380 | dev_warn(&client->dev, "error %d muxing %s as video-in\n", | |
381 | status, video); | |
382 | ||
383 | /* init LED cache, and turn off the LEDs */ | |
384 | msp_led_cache = 0xff; | |
385 | dm355evm_msp_write(msp_led_cache, DM355EVM_MSP_LED); | |
386 | ||
387 | /* export capabilities we support */ | |
388 | status = add_children(client); | |
389 | if (status < 0) | |
390 | goto fail; | |
391 | ||
392 | /* PM hookup */ | |
393 | pm_power_off = dm355evm_power_off; | |
394 | ||
395 | return 0; | |
396 | ||
397 | fail: | |
398 | /* FIXME remove children ... */ | |
399 | dm355evm_msp_remove(client); | |
400 | return status; | |
401 | } | |
402 | ||
403 | static const struct i2c_device_id dm355evm_msp_ids[] = { | |
404 | { "dm355evm_msp", 0 }, | |
405 | { /* end of list */ }, | |
406 | }; | |
407 | MODULE_DEVICE_TABLE(i2c, dm355evm_msp_ids); | |
408 | ||
409 | static struct i2c_driver dm355evm_msp_driver = { | |
410 | .driver.name = "dm355evm_msp", | |
411 | .id_table = dm355evm_msp_ids, | |
412 | .probe = dm355evm_msp_probe, | |
413 | .remove = dm355evm_msp_remove, | |
414 | }; | |
415 | ||
416 | static int __init dm355evm_msp_init(void) | |
417 | { | |
418 | return i2c_add_driver(&dm355evm_msp_driver); | |
419 | } | |
420 | subsys_initcall(dm355evm_msp_init); | |
421 | ||
422 | static void __exit dm355evm_msp_exit(void) | |
423 | { | |
424 | i2c_del_driver(&dm355evm_msp_driver); | |
425 | } | |
426 | module_exit(dm355evm_msp_exit); | |
427 | ||
428 | MODULE_DESCRIPTION("Interface to MSP430 firmware on DM355EVM"); | |
429 | MODULE_LICENSE("GPL"); |