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path: root/drivers/mfd/dm355evm_msp.c
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-rw-r--r--drivers/mfd/dm355evm_msp.c420
1 files changed, 420 insertions, 0 deletions
diff --git a/drivers/mfd/dm355evm_msp.c b/drivers/mfd/dm355evm_msp.c
new file mode 100644
index 000000000000..4214b3f72426
--- /dev/null
+++ b/drivers/mfd/dm355evm_msp.c
@@ -0,0 +1,420 @@
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
35#if defined(CONFIG_KEYBOARD_DM355EVM) \
36 || defined(CONFIG_KEYBOARD_DM355EVM_MODULE)
37#define msp_has_keyboard() true
38#else
39#define msp_has_keyboard() false
40#endif
41
42#if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE)
43#define msp_has_leds() true
44#else
45#define msp_has_leds() false
46#endif
47
48#if defined(CONFIG_RTC_DRV_DM355EVM) || defined(CONFIG_RTC_DRV_DM355EVM_MODULE)
49#define msp_has_rtc() true
50#else
51#define msp_has_rtc() false
52#endif
53
54#if defined(CONFIG_VIDEO_TVP514X) || defined(CONFIG_VIDEO_TVP514X_MODULE)
55#define msp_has_tvp() true
56#else
57#define msp_has_tvp() false
58#endif
59
60
61/*----------------------------------------------------------------------*/
62
63/* REVISIT for paranoia's sake, retry reads/writes on error */
64
65static struct i2c_client *msp430;
66
67/**
68 * dm355evm_msp_write - Writes a register in dm355evm_msp
69 * @value: the value to be written
70 * @reg: register address
71 *
72 * Returns result of operation - 0 is success, else negative errno
73 */
74int dm355evm_msp_write(u8 value, u8 reg)
75{
76 return i2c_smbus_write_byte_data(msp430, reg, value);
77}
78EXPORT_SYMBOL(dm355evm_msp_write);
79
80/**
81 * dm355evm_msp_read - Reads a register from dm355evm_msp
82 * @reg: register address
83 *
84 * Returns result of operation - value, or negative errno
85 */
86int dm355evm_msp_read(u8 reg)
87{
88 return i2c_smbus_read_byte_data(msp430, reg);
89}
90EXPORT_SYMBOL(dm355evm_msp_read);
91
92/*----------------------------------------------------------------------*/
93
94/*
95 * Many of the msp430 pins are just used as fixed-direction GPIOs.
96 * We could export a few more of them this way, if we wanted.
97 */
98#define MSP_GPIO(bit,reg) ((DM355EVM_MSP_ ## reg) << 3 | (bit))
99
100static const u8 msp_gpios[] = {
101 /* eight leds */
102 MSP_GPIO(0, LED), MSP_GPIO(1, LED),
103 MSP_GPIO(2, LED), MSP_GPIO(3, LED),
104 MSP_GPIO(4, LED), MSP_GPIO(5, LED),
105 MSP_GPIO(6, LED), MSP_GPIO(7, LED),
106 /* SW6 and the NTSC/nPAL jumper */
107 MSP_GPIO(0, SWITCH1), MSP_GPIO(1, SWITCH1),
108 MSP_GPIO(2, SWITCH1), MSP_GPIO(3, SWITCH1),
109 MSP_GPIO(4, SWITCH1),
110};
111
112#define MSP_GPIO_REG(offset) (msp_gpios[(offset)] >> 3)
113#define MSP_GPIO_MASK(offset) BIT(msp_gpios[(offset)] & 0x07)
114
115static int msp_gpio_in(struct gpio_chip *chip, unsigned offset)
116{
117 switch (MSP_GPIO_REG(offset)) {
118 case DM355EVM_MSP_SWITCH1:
119 case DM355EVM_MSP_SWITCH2:
120 case DM355EVM_MSP_SDMMC:
121 return 0;
122 default:
123 return -EINVAL;
124 }
125}
126
127static u8 msp_led_cache;
128
129static int msp_gpio_get(struct gpio_chip *chip, unsigned offset)
130{
131 int reg, status;
132
133 reg = MSP_GPIO_REG(offset);
134 status = dm355evm_msp_read(reg);
135 if (status < 0)
136 return status;
137 if (reg == DM355EVM_MSP_LED)
138 msp_led_cache = status;
139 return status & MSP_GPIO_MASK(offset);
140}
141
142static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value)
143{
144 int mask, bits;
145
146 /* NOTE: there are some other signals that could be
147 * packaged as output GPIOs, but they aren't as useful
148 * as the LEDs ... so for now we don't.
149 */
150 if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED)
151 return -EINVAL;
152
153 mask = MSP_GPIO_MASK(offset);
154 bits = msp_led_cache;
155
156 bits &= ~mask;
157 if (value)
158 bits |= mask;
159 msp_led_cache = bits;
160
161 return dm355evm_msp_write(bits, DM355EVM_MSP_LED);
162}
163
164static void msp_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
165{
166 msp_gpio_out(chip, offset, value);
167}
168
169static struct gpio_chip dm355evm_msp_gpio = {
170 .label = "dm355evm_msp",
171 .owner = THIS_MODULE,
172 .direction_input = msp_gpio_in,
173 .get = msp_gpio_get,
174 .direction_output = msp_gpio_out,
175 .set = msp_gpio_set,
176 .base = -EINVAL, /* dynamic assignment */
177 .ngpio = ARRAY_SIZE(msp_gpios),
178 .can_sleep = true,
179};
180
181/*----------------------------------------------------------------------*/
182
183static struct device *add_child(struct i2c_client *client, const char *name,
184 void *pdata, unsigned pdata_len,
185 bool can_wakeup, int irq)
186{
187 struct platform_device *pdev;
188 int status;
189
190 pdev = platform_device_alloc(name, -1);
191 if (!pdev) {
192 dev_dbg(&client->dev, "can't alloc dev\n");
193 status = -ENOMEM;
194 goto err;
195 }
196
197 device_init_wakeup(&pdev->dev, can_wakeup);
198 pdev->dev.parent = &client->dev;
199
200 if (pdata) {
201 status = platform_device_add_data(pdev, pdata, pdata_len);
202 if (status < 0) {
203 dev_dbg(&pdev->dev, "can't add platform_data\n");
204 goto err;
205 }
206 }
207
208 if (irq) {
209 struct resource r = {
210 .start = irq,
211 .flags = IORESOURCE_IRQ,
212 };
213
214 status = platform_device_add_resources(pdev, &r, 1);
215 if (status < 0) {
216 dev_dbg(&pdev->dev, "can't add irq\n");
217 goto err;
218 }
219 }
220
221 status = platform_device_add(pdev);
222
223err:
224 if (status < 0) {
225 platform_device_put(pdev);
226 dev_err(&client->dev, "can't add %s dev\n", name);
227 return ERR_PTR(status);
228 }
229 return &pdev->dev;
230}
231
232static int add_children(struct i2c_client *client)
233{
234 static const struct {
235 int offset;
236 char *label;
237 } config_inputs[] = {
238 /* 8 == right after the LEDs */
239 { 8 + 0, "sw6_1", },
240 { 8 + 1, "sw6_2", },
241 { 8 + 2, "sw6_3", },
242 { 8 + 3, "sw6_4", },
243 { 8 + 4, "NTSC/nPAL", },
244 };
245
246 struct device *child;
247 int status;
248 int i;
249
250 /* GPIO-ish stuff */
251 dm355evm_msp_gpio.dev = &client->dev;
252 status = gpiochip_add(&dm355evm_msp_gpio);
253 if (status < 0)
254 return status;
255
256 /* LED output */
257 if (msp_has_leds()) {
258#define GPIO_LED(l) .name = l, .active_low = true
259 static struct gpio_led evm_leds[] = {
260 { GPIO_LED("dm355evm::ds14"),
261 .default_trigger = "heartbeat", },
262 { GPIO_LED("dm355evm::ds15"),
263 .default_trigger = "mmc0", },
264 { GPIO_LED("dm355evm::ds16"),
265 /* could also be a CE-ATA drive */
266 .default_trigger = "mmc1", },
267 { GPIO_LED("dm355evm::ds17"),
268 .default_trigger = "nand-disk", },
269 { GPIO_LED("dm355evm::ds18"), },
270 { GPIO_LED("dm355evm::ds19"), },
271 { GPIO_LED("dm355evm::ds20"), },
272 { GPIO_LED("dm355evm::ds21"), },
273 };
274#undef GPIO_LED
275
276 struct gpio_led_platform_data evm_led_data = {
277 .num_leds = ARRAY_SIZE(evm_leds),
278 .leds = evm_leds,
279 };
280
281 for (i = 0; i < ARRAY_SIZE(evm_leds); i++)
282 evm_leds[i].gpio = i + dm355evm_msp_gpio.base;
283
284 /* NOTE: these are the only fully programmable LEDs
285 * on the board, since GPIO-61/ds22 (and many signals
286 * going to DC7) must be used for AEMIF address lines
287 * unless the top 1 GB of NAND is unused...
288 */
289 child = add_child(client, "leds-gpio",
290 &evm_led_data, sizeof(evm_led_data),
291 false, 0);
292 if (IS_ERR(child))
293 return PTR_ERR(child);
294 }
295
296 /* configuration inputs */
297 for (i = 0; i < ARRAY_SIZE(config_inputs); i++) {
298 int gpio = dm355evm_msp_gpio.base + config_inputs[i].offset;
299
300 gpio_request(gpio, config_inputs[i].label);
301 gpio_direction_input(gpio);
302
303 /* make it easy for userspace to see these */
304 gpio_export(gpio, false);
305 }
306
307 /* RTC is a 32 bit counter, no alarm */
308 if (msp_has_rtc()) {
309 child = add_child(client, "rtc-dm355evm",
310 NULL, 0, false, 0);
311 if (IS_ERR(child))
312 return PTR_ERR(child);
313 }
314
315 /* input from buttons and IR remote (uses the IRQ) */
316 if (msp_has_keyboard()) {
317 child = add_child(client, "dm355evm_keys",
318 NULL, 0, true, client->irq);
319 if (IS_ERR(child))
320 return PTR_ERR(child);
321 }
322
323 return 0;
324}
325
326/*----------------------------------------------------------------------*/
327
328static void dm355evm_command(unsigned command)
329{
330 int status;
331
332 status = dm355evm_msp_write(command, DM355EVM_MSP_COMMAND);
333 if (status < 0)
334 dev_err(&msp430->dev, "command %d failure %d\n",
335 command, status);
336}
337
338static void dm355evm_power_off(void)
339{
340 dm355evm_command(MSP_COMMAND_POWEROFF);
341}
342
343static int dm355evm_msp_remove(struct i2c_client *client)
344{
345 pm_power_off = NULL;
346 msp430 = NULL;
347 return 0;
348}
349
350static int
351dm355evm_msp_probe(struct i2c_client *client, const struct i2c_device_id *id)
352{
353 int status;
354 const char *video = msp_has_tvp() ? "TVP5146" : "imager";
355
356 if (msp430)
357 return -EBUSY;
358 msp430 = client;
359
360 /* display revision status; doubles as sanity check */
361 status = dm355evm_msp_read(DM355EVM_MSP_FIRMREV);
362 if (status < 0)
363 goto fail;
364 dev_info(&client->dev, "firmware v.%02X, %s as video-in\n",
365 status, video);
366
367 /* mux video input: either tvp5146 or some external imager */
368 status = dm355evm_msp_write(msp_has_tvp() ? 0 : MSP_VIDEO_IMAGER,
369 DM355EVM_MSP_VIDEO_IN);
370 if (status < 0)
371 dev_warn(&client->dev, "error %d muxing %s as video-in\n",
372 status, video);
373
374 /* init LED cache, and turn off the LEDs */
375 msp_led_cache = 0xff;
376 dm355evm_msp_write(msp_led_cache, DM355EVM_MSP_LED);
377
378 /* export capabilities we support */
379 status = add_children(client);
380 if (status < 0)
381 goto fail;
382
383 /* PM hookup */
384 pm_power_off = dm355evm_power_off;
385
386 return 0;
387
388fail:
389 /* FIXME remove children ... */
390 dm355evm_msp_remove(client);
391 return status;
392}
393
394static const struct i2c_device_id dm355evm_msp_ids[] = {
395 { "dm355evm_msp", 0 },
396 { /* end of list */ },
397};
398MODULE_DEVICE_TABLE(i2c, dm355evm_msp_ids);
399
400static struct i2c_driver dm355evm_msp_driver = {
401 .driver.name = "dm355evm_msp",
402 .id_table = dm355evm_msp_ids,
403 .probe = dm355evm_msp_probe,
404 .remove = dm355evm_msp_remove,
405};
406
407static int __init dm355evm_msp_init(void)
408{
409 return i2c_add_driver(&dm355evm_msp_driver);
410}
411subsys_initcall(dm355evm_msp_init);
412
413static void __exit dm355evm_msp_exit(void)
414{
415 i2c_del_driver(&dm355evm_msp_driver);
416}
417module_exit(dm355evm_msp_exit);
418
419MODULE_DESCRIPTION("Interface to MSP430 firmware on DM355EVM");
420MODULE_LICENSE("GPL");