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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
0931a4c6 DB |
2 | /* |
3 | * dm355evm_msp.c - driver for MSP430 firmware on DM355EVM board | |
4 | * | |
5 | * Copyright (C) 2008 David Brownell | |
0931a4c6 DB |
6 | */ |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/mutex.h> | |
10 | #include <linux/platform_device.h> | |
11 | #include <linux/clk.h> | |
4e36dd33 | 12 | #include <linux/module.h> |
0931a4c6 DB |
13 | #include <linux/err.h> |
14 | #include <linux/gpio.h> | |
15 | #include <linux/leds.h> | |
16 | #include <linux/i2c.h> | |
0335a955 | 17 | #include <linux/mfd/dm355evm_msp.h> |
0931a4c6 DB |
18 | |
19 | ||
20 | /* | |
21 | * The DM355 is a DaVinci chip with video support but no C64+ DSP. Its | |
22 | * EVM board has an MSP430 programmed with firmware for various board | |
23 | * support functions. This driver exposes some of them directly, and | |
24 | * supports other drivers (e.g. RTC, input) for more complex access. | |
25 | * | |
26 | * Because this firmware is entirely board-specific, this file embeds | |
27 | * knowledge that would be passed as platform_data in a generic driver. | |
28 | * | |
29 | * This driver was tested with firmware revision A4. | |
30 | */ | |
31 | ||
5eb519f3 | 32 | #if IS_ENABLED(CONFIG_INPUT_DM355EVM) |
0931a4c6 DB |
33 | #define msp_has_keyboard() true |
34 | #else | |
35 | #define msp_has_keyboard() false | |
36 | #endif | |
37 | ||
5eb519f3 | 38 | #if IS_ENABLED(CONFIG_LEDS_GPIO) |
0931a4c6 DB |
39 | #define msp_has_leds() true |
40 | #else | |
41 | #define msp_has_leds() false | |
42 | #endif | |
43 | ||
5eb519f3 | 44 | #if IS_ENABLED(CONFIG_RTC_DRV_DM355EVM) |
0931a4c6 DB |
45 | #define msp_has_rtc() true |
46 | #else | |
47 | #define msp_has_rtc() false | |
48 | #endif | |
49 | ||
5eb519f3 | 50 | #if IS_ENABLED(CONFIG_VIDEO_TVP514X) |
0931a4c6 DB |
51 | #define msp_has_tvp() true |
52 | #else | |
53 | #define msp_has_tvp() false | |
54 | #endif | |
55 | ||
56 | ||
57 | /*----------------------------------------------------------------------*/ | |
58 | ||
59 | /* REVISIT for paranoia's sake, retry reads/writes on error */ | |
60 | ||
61 | static struct i2c_client *msp430; | |
62 | ||
63 | /** | |
64 | * dm355evm_msp_write - Writes a register in dm355evm_msp | |
65 | * @value: the value to be written | |
66 | * @reg: register address | |
67 | * | |
68 | * Returns result of operation - 0 is success, else negative errno | |
69 | */ | |
70 | int dm355evm_msp_write(u8 value, u8 reg) | |
71 | { | |
72 | return i2c_smbus_write_byte_data(msp430, reg, value); | |
73 | } | |
74 | EXPORT_SYMBOL(dm355evm_msp_write); | |
75 | ||
76 | /** | |
77 | * dm355evm_msp_read - Reads a register from dm355evm_msp | |
78 | * @reg: register address | |
79 | * | |
80 | * Returns result of operation - value, or negative errno | |
81 | */ | |
82 | int dm355evm_msp_read(u8 reg) | |
83 | { | |
84 | return i2c_smbus_read_byte_data(msp430, reg); | |
85 | } | |
86 | EXPORT_SYMBOL(dm355evm_msp_read); | |
87 | ||
88 | /*----------------------------------------------------------------------*/ | |
89 | ||
90 | /* | |
91 | * Many of the msp430 pins are just used as fixed-direction GPIOs. | |
92 | * We could export a few more of them this way, if we wanted. | |
93 | */ | |
016f4219 | 94 | #define MSP_GPIO(bit, reg) ((DM355EVM_MSP_ ## reg) << 3 | (bit)) |
0931a4c6 DB |
95 | |
96 | static const u8 msp_gpios[] = { | |
97 | /* eight leds */ | |
98 | MSP_GPIO(0, LED), MSP_GPIO(1, LED), | |
99 | MSP_GPIO(2, LED), MSP_GPIO(3, LED), | |
100 | MSP_GPIO(4, LED), MSP_GPIO(5, LED), | |
101 | MSP_GPIO(6, LED), MSP_GPIO(7, LED), | |
102 | /* SW6 and the NTSC/nPAL jumper */ | |
103 | MSP_GPIO(0, SWITCH1), MSP_GPIO(1, SWITCH1), | |
104 | MSP_GPIO(2, SWITCH1), MSP_GPIO(3, SWITCH1), | |
105 | MSP_GPIO(4, SWITCH1), | |
d1fdb4f6 | 106 | /* switches on MMC/SD sockets */ |
89a99e76 VB |
107 | /* |
108 | * Note: EVMDM355_ECP_VA4.pdf suggests that Bit 2 and 4 should be | |
109 | * checked for card detection. However on the EVM bit 1 and 3 gives | |
110 | * this status, for 0 and 1 instance respectively. The pdf also | |
111 | * suggests that Bit 1 and 3 should be checked for write protection. | |
112 | * However on the EVM bit 2 and 4 gives this status,for 0 and 1 | |
113 | * instance respectively. | |
114 | */ | |
115 | MSP_GPIO(2, SDMMC), MSP_GPIO(1, SDMMC), /* mmc0 WP, nCD */ | |
116 | MSP_GPIO(4, SDMMC), MSP_GPIO(3, SDMMC), /* mmc1 WP, nCD */ | |
0931a4c6 DB |
117 | }; |
118 | ||
119 | #define MSP_GPIO_REG(offset) (msp_gpios[(offset)] >> 3) | |
120 | #define MSP_GPIO_MASK(offset) BIT(msp_gpios[(offset)] & 0x07) | |
121 | ||
122 | static int msp_gpio_in(struct gpio_chip *chip, unsigned offset) | |
123 | { | |
124 | switch (MSP_GPIO_REG(offset)) { | |
125 | case DM355EVM_MSP_SWITCH1: | |
126 | case DM355EVM_MSP_SWITCH2: | |
127 | case DM355EVM_MSP_SDMMC: | |
128 | return 0; | |
129 | default: | |
130 | return -EINVAL; | |
131 | } | |
132 | } | |
133 | ||
134 | static u8 msp_led_cache; | |
135 | ||
136 | static int msp_gpio_get(struct gpio_chip *chip, unsigned offset) | |
137 | { | |
138 | int reg, status; | |
139 | ||
140 | reg = MSP_GPIO_REG(offset); | |
141 | status = dm355evm_msp_read(reg); | |
142 | if (status < 0) | |
143 | return status; | |
144 | if (reg == DM355EVM_MSP_LED) | |
145 | msp_led_cache = status; | |
fe0b4867 | 146 | return !!(status & MSP_GPIO_MASK(offset)); |
0931a4c6 DB |
147 | } |
148 | ||
149 | static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value) | |
150 | { | |
151 | int mask, bits; | |
152 | ||
153 | /* NOTE: there are some other signals that could be | |
154 | * packaged as output GPIOs, but they aren't as useful | |
155 | * as the LEDs ... so for now we don't. | |
156 | */ | |
157 | if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED) | |
158 | return -EINVAL; | |
159 | ||
160 | mask = MSP_GPIO_MASK(offset); | |
161 | bits = msp_led_cache; | |
162 | ||
163 | bits &= ~mask; | |
164 | if (value) | |
165 | bits |= mask; | |
166 | msp_led_cache = bits; | |
167 | ||
168 | return dm355evm_msp_write(bits, DM355EVM_MSP_LED); | |
169 | } | |
170 | ||
171 | static void msp_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
172 | { | |
173 | msp_gpio_out(chip, offset, value); | |
174 | } | |
175 | ||
176 | static struct gpio_chip dm355evm_msp_gpio = { | |
177 | .label = "dm355evm_msp", | |
178 | .owner = THIS_MODULE, | |
179 | .direction_input = msp_gpio_in, | |
180 | .get = msp_gpio_get, | |
181 | .direction_output = msp_gpio_out, | |
182 | .set = msp_gpio_set, | |
183 | .base = -EINVAL, /* dynamic assignment */ | |
184 | .ngpio = ARRAY_SIZE(msp_gpios), | |
185 | .can_sleep = true, | |
186 | }; | |
187 | ||
188 | /*----------------------------------------------------------------------*/ | |
189 | ||
190 | static struct device *add_child(struct i2c_client *client, const char *name, | |
191 | void *pdata, unsigned pdata_len, | |
192 | bool can_wakeup, int irq) | |
193 | { | |
194 | struct platform_device *pdev; | |
195 | int status; | |
196 | ||
197 | pdev = platform_device_alloc(name, -1); | |
d313cdde ME |
198 | if (!pdev) |
199 | return ERR_PTR(-ENOMEM); | |
0931a4c6 DB |
200 | |
201 | device_init_wakeup(&pdev->dev, can_wakeup); | |
202 | pdev->dev.parent = &client->dev; | |
203 | ||
204 | if (pdata) { | |
205 | status = platform_device_add_data(pdev, pdata, pdata_len); | |
206 | if (status < 0) { | |
207 | dev_dbg(&pdev->dev, "can't add platform_data\n"); | |
29090265 | 208 | goto put_device; |
0931a4c6 DB |
209 | } |
210 | } | |
211 | ||
212 | if (irq) { | |
213 | struct resource r = { | |
214 | .start = irq, | |
215 | .flags = IORESOURCE_IRQ, | |
216 | }; | |
217 | ||
218 | status = platform_device_add_resources(pdev, &r, 1); | |
219 | if (status < 0) { | |
220 | dev_dbg(&pdev->dev, "can't add irq\n"); | |
29090265 | 221 | goto put_device; |
0931a4c6 DB |
222 | } |
223 | } | |
224 | ||
225 | status = platform_device_add(pdev); | |
29090265 ME |
226 | if (status) |
227 | goto put_device; | |
0931a4c6 | 228 | |
0931a4c6 | 229 | return &pdev->dev; |
29090265 ME |
230 | |
231 | put_device: | |
232 | platform_device_put(pdev); | |
233 | dev_err(&client->dev, "failed to add device %s\n", name); | |
234 | return ERR_PTR(status); | |
0931a4c6 DB |
235 | } |
236 | ||
237 | static int add_children(struct i2c_client *client) | |
238 | { | |
239 | static const struct { | |
240 | int offset; | |
241 | char *label; | |
242 | } config_inputs[] = { | |
243 | /* 8 == right after the LEDs */ | |
244 | { 8 + 0, "sw6_1", }, | |
245 | { 8 + 1, "sw6_2", }, | |
246 | { 8 + 2, "sw6_3", }, | |
247 | { 8 + 3, "sw6_4", }, | |
248 | { 8 + 4, "NTSC/nPAL", }, | |
249 | }; | |
250 | ||
251 | struct device *child; | |
252 | int status; | |
253 | int i; | |
254 | ||
255 | /* GPIO-ish stuff */ | |
58383c78 | 256 | dm355evm_msp_gpio.parent = &client->dev; |
4363765c | 257 | status = gpiochip_add_data(&dm355evm_msp_gpio, NULL); |
0931a4c6 DB |
258 | if (status < 0) |
259 | return status; | |
260 | ||
261 | /* LED output */ | |
262 | if (msp_has_leds()) { | |
263 | #define GPIO_LED(l) .name = l, .active_low = true | |
264 | static struct gpio_led evm_leds[] = { | |
265 | { GPIO_LED("dm355evm::ds14"), | |
266 | .default_trigger = "heartbeat", }, | |
267 | { GPIO_LED("dm355evm::ds15"), | |
268 | .default_trigger = "mmc0", }, | |
269 | { GPIO_LED("dm355evm::ds16"), | |
270 | /* could also be a CE-ATA drive */ | |
271 | .default_trigger = "mmc1", }, | |
272 | { GPIO_LED("dm355evm::ds17"), | |
273 | .default_trigger = "nand-disk", }, | |
274 | { GPIO_LED("dm355evm::ds18"), }, | |
275 | { GPIO_LED("dm355evm::ds19"), }, | |
276 | { GPIO_LED("dm355evm::ds20"), }, | |
277 | { GPIO_LED("dm355evm::ds21"), }, | |
278 | }; | |
279 | #undef GPIO_LED | |
280 | ||
281 | struct gpio_led_platform_data evm_led_data = { | |
282 | .num_leds = ARRAY_SIZE(evm_leds), | |
283 | .leds = evm_leds, | |
284 | }; | |
285 | ||
286 | for (i = 0; i < ARRAY_SIZE(evm_leds); i++) | |
287 | evm_leds[i].gpio = i + dm355evm_msp_gpio.base; | |
288 | ||
289 | /* NOTE: these are the only fully programmable LEDs | |
290 | * on the board, since GPIO-61/ds22 (and many signals | |
291 | * going to DC7) must be used for AEMIF address lines | |
292 | * unless the top 1 GB of NAND is unused... | |
293 | */ | |
294 | child = add_child(client, "leds-gpio", | |
295 | &evm_led_data, sizeof(evm_led_data), | |
296 | false, 0); | |
297 | if (IS_ERR(child)) | |
298 | return PTR_ERR(child); | |
299 | } | |
300 | ||
301 | /* configuration inputs */ | |
302 | for (i = 0; i < ARRAY_SIZE(config_inputs); i++) { | |
303 | int gpio = dm355evm_msp_gpio.base + config_inputs[i].offset; | |
304 | ||
97f2bf51 | 305 | gpio_request_one(gpio, GPIOF_IN, config_inputs[i].label); |
0931a4c6 DB |
306 | |
307 | /* make it easy for userspace to see these */ | |
308 | gpio_export(gpio, false); | |
309 | } | |
310 | ||
d1fdb4f6 | 311 | /* MMC/SD inputs -- right after the last config input */ |
334a41ce JH |
312 | if (dev_get_platdata(&client->dev)) { |
313 | void (*mmcsd_setup)(unsigned) = dev_get_platdata(&client->dev); | |
d1fdb4f6 DB |
314 | |
315 | mmcsd_setup(dm355evm_msp_gpio.base + 8 + 5); | |
316 | } | |
317 | ||
0931a4c6 DB |
318 | /* RTC is a 32 bit counter, no alarm */ |
319 | if (msp_has_rtc()) { | |
320 | child = add_child(client, "rtc-dm355evm", | |
321 | NULL, 0, false, 0); | |
322 | if (IS_ERR(child)) | |
323 | return PTR_ERR(child); | |
324 | } | |
325 | ||
326 | /* input from buttons and IR remote (uses the IRQ) */ | |
327 | if (msp_has_keyboard()) { | |
328 | child = add_child(client, "dm355evm_keys", | |
329 | NULL, 0, true, client->irq); | |
330 | if (IS_ERR(child)) | |
331 | return PTR_ERR(child); | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | /*----------------------------------------------------------------------*/ | |
338 | ||
339 | static void dm355evm_command(unsigned command) | |
340 | { | |
341 | int status; | |
342 | ||
343 | status = dm355evm_msp_write(command, DM355EVM_MSP_COMMAND); | |
344 | if (status < 0) | |
345 | dev_err(&msp430->dev, "command %d failure %d\n", | |
346 | command, status); | |
347 | } | |
348 | ||
349 | static void dm355evm_power_off(void) | |
350 | { | |
351 | dm355evm_command(MSP_COMMAND_POWEROFF); | |
352 | } | |
353 | ||
354 | static int dm355evm_msp_remove(struct i2c_client *client) | |
355 | { | |
356 | pm_power_off = NULL; | |
357 | msp430 = NULL; | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static int | |
362 | dm355evm_msp_probe(struct i2c_client *client, const struct i2c_device_id *id) | |
363 | { | |
364 | int status; | |
365 | const char *video = msp_has_tvp() ? "TVP5146" : "imager"; | |
366 | ||
367 | if (msp430) | |
368 | return -EBUSY; | |
369 | msp430 = client; | |
370 | ||
371 | /* display revision status; doubles as sanity check */ | |
372 | status = dm355evm_msp_read(DM355EVM_MSP_FIRMREV); | |
373 | if (status < 0) | |
374 | goto fail; | |
375 | dev_info(&client->dev, "firmware v.%02X, %s as video-in\n", | |
376 | status, video); | |
377 | ||
378 | /* mux video input: either tvp5146 or some external imager */ | |
379 | status = dm355evm_msp_write(msp_has_tvp() ? 0 : MSP_VIDEO_IMAGER, | |
380 | DM355EVM_MSP_VIDEO_IN); | |
381 | if (status < 0) | |
382 | dev_warn(&client->dev, "error %d muxing %s as video-in\n", | |
383 | status, video); | |
384 | ||
385 | /* init LED cache, and turn off the LEDs */ | |
386 | msp_led_cache = 0xff; | |
387 | dm355evm_msp_write(msp_led_cache, DM355EVM_MSP_LED); | |
388 | ||
389 | /* export capabilities we support */ | |
390 | status = add_children(client); | |
391 | if (status < 0) | |
392 | goto fail; | |
393 | ||
394 | /* PM hookup */ | |
395 | pm_power_off = dm355evm_power_off; | |
396 | ||
397 | return 0; | |
398 | ||
399 | fail: | |
400 | /* FIXME remove children ... */ | |
401 | dm355evm_msp_remove(client); | |
402 | return status; | |
403 | } | |
404 | ||
405 | static const struct i2c_device_id dm355evm_msp_ids[] = { | |
406 | { "dm355evm_msp", 0 }, | |
407 | { /* end of list */ }, | |
408 | }; | |
409 | MODULE_DEVICE_TABLE(i2c, dm355evm_msp_ids); | |
410 | ||
411 | static struct i2c_driver dm355evm_msp_driver = { | |
412 | .driver.name = "dm355evm_msp", | |
413 | .id_table = dm355evm_msp_ids, | |
414 | .probe = dm355evm_msp_probe, | |
415 | .remove = dm355evm_msp_remove, | |
416 | }; | |
417 | ||
418 | static int __init dm355evm_msp_init(void) | |
419 | { | |
420 | return i2c_add_driver(&dm355evm_msp_driver); | |
421 | } | |
422 | subsys_initcall(dm355evm_msp_init); | |
423 | ||
424 | static void __exit dm355evm_msp_exit(void) | |
425 | { | |
426 | i2c_del_driver(&dm355evm_msp_driver); | |
427 | } | |
428 | module_exit(dm355evm_msp_exit); | |
429 | ||
430 | MODULE_DESCRIPTION("Interface to MSP430 firmware on DM355EVM"); | |
431 | MODULE_LICENSE("GPL"); |