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61fd1526 AC |
1 | /* |
2 | * max3107.c - spi uart protocol driver for Maxim 3107 | |
3 | * Based on max3100.c | |
4 | * by Christian Pellegrin <chripell@evolware.org> | |
5 | * and max3110.c | |
6 | * by Feng Tang <feng.tang@intel.com> | |
7 | * | |
8 | * Copyright (C) Aavamobile 2009 | |
9 | * | |
10 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | * | |
26 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
27 | * | |
28 | */ | |
29 | ||
30 | #include <linux/delay.h> | |
31 | #include <linux/device.h> | |
32 | #include <linux/serial_core.h> | |
33 | #include <linux/serial.h> | |
34 | #include <linux/spi/spi.h> | |
35 | #include <linux/freezer.h> | |
36 | #include <linux/platform_device.h> | |
37 | #include <linux/gpio.h> | |
38 | #include <linux/sfi.h> | |
39 | #include <asm/mrst.h> | |
40 | #include "max3107.h" | |
41 | ||
42 | /* GPIO direction to input function */ | |
43 | static int max3107_gpio_direction_in(struct gpio_chip *chip, unsigned offset) | |
44 | { | |
45 | struct max3107_port *s = container_of(chip, struct max3107_port, chip); | |
46 | u16 buf[1]; /* Buffer for SPI transfer */ | |
47 | ||
48 | if (offset >= MAX3107_GPIO_COUNT) { | |
49 | dev_err(&s->spi->dev, "Invalid GPIO\n"); | |
50 | return -EINVAL; | |
51 | } | |
52 | ||
53 | /* Read current GPIO configuration register */ | |
54 | buf[0] = MAX3107_GPIOCFG_REG; | |
55 | /* Perform SPI transfer */ | |
56 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) { | |
57 | dev_err(&s->spi->dev, "SPI transfer GPIO read failed\n"); | |
58 | return -EIO; | |
59 | } | |
60 | buf[0] &= MAX3107_SPI_RX_DATA_MASK; | |
61 | ||
62 | /* Set GPIO to input */ | |
63 | buf[0] &= ~(0x0001 << offset); | |
64 | ||
65 | /* Write new GPIO configuration register value */ | |
66 | buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG); | |
67 | /* Perform SPI transfer */ | |
68 | if (max3107_rw(s, (u8 *)buf, NULL, 2)) { | |
69 | dev_err(&s->spi->dev, "SPI transfer GPIO write failed\n"); | |
70 | return -EIO; | |
71 | } | |
72 | return 0; | |
73 | } | |
74 | ||
75 | /* GPIO direction to output function */ | |
76 | static int max3107_gpio_direction_out(struct gpio_chip *chip, unsigned offset, | |
77 | int value) | |
78 | { | |
79 | struct max3107_port *s = container_of(chip, struct max3107_port, chip); | |
80 | u16 buf[2]; /* Buffer for SPI transfers */ | |
81 | ||
82 | if (offset >= MAX3107_GPIO_COUNT) { | |
83 | dev_err(&s->spi->dev, "Invalid GPIO\n"); | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
87 | /* Read current GPIO configuration and data registers */ | |
88 | buf[0] = MAX3107_GPIOCFG_REG; | |
89 | buf[1] = MAX3107_GPIODATA_REG; | |
90 | /* Perform SPI transfer */ | |
91 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) { | |
92 | dev_err(&s->spi->dev, "SPI transfer gpio failed\n"); | |
93 | return -EIO; | |
94 | } | |
95 | buf[0] &= MAX3107_SPI_RX_DATA_MASK; | |
96 | buf[1] &= MAX3107_SPI_RX_DATA_MASK; | |
97 | ||
98 | /* Set GPIO to output */ | |
99 | buf[0] |= (0x0001 << offset); | |
100 | /* Set value */ | |
101 | if (value) | |
102 | buf[1] |= (0x0001 << offset); | |
103 | else | |
104 | buf[1] &= ~(0x0001 << offset); | |
105 | ||
106 | /* Write new GPIO configuration and data register values */ | |
107 | buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIOCFG_REG); | |
108 | buf[1] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG); | |
109 | /* Perform SPI transfer */ | |
110 | if (max3107_rw(s, (u8 *)buf, NULL, 4)) { | |
111 | dev_err(&s->spi->dev, | |
112 | "SPI transfer for GPIO conf data w failed\n"); | |
113 | return -EIO; | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | ||
118 | /* GPIO value query function */ | |
119 | static int max3107_gpio_get(struct gpio_chip *chip, unsigned offset) | |
120 | { | |
121 | struct max3107_port *s = container_of(chip, struct max3107_port, chip); | |
122 | u16 buf[1]; /* Buffer for SPI transfer */ | |
123 | ||
124 | if (offset >= MAX3107_GPIO_COUNT) { | |
125 | dev_err(&s->spi->dev, "Invalid GPIO\n"); | |
126 | return -EINVAL; | |
127 | } | |
128 | ||
129 | /* Read current GPIO data register */ | |
130 | buf[0] = MAX3107_GPIODATA_REG; | |
131 | /* Perform SPI transfer */ | |
132 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 2)) { | |
133 | dev_err(&s->spi->dev, "SPI transfer GPIO data r failed\n"); | |
134 | return -EIO; | |
135 | } | |
136 | buf[0] &= MAX3107_SPI_RX_DATA_MASK; | |
137 | ||
138 | /* Return value */ | |
139 | return buf[0] & (0x0001 << offset); | |
140 | } | |
141 | ||
142 | /* GPIO value set function */ | |
143 | static void max3107_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
144 | { | |
145 | struct max3107_port *s = container_of(chip, struct max3107_port, chip); | |
146 | u16 buf[2]; /* Buffer for SPI transfers */ | |
147 | ||
148 | if (offset >= MAX3107_GPIO_COUNT) { | |
149 | dev_err(&s->spi->dev, "Invalid GPIO\n"); | |
150 | return; | |
151 | } | |
152 | ||
153 | /* Read current GPIO configuration registers*/ | |
154 | buf[0] = MAX3107_GPIODATA_REG; | |
155 | buf[1] = MAX3107_GPIOCFG_REG; | |
156 | /* Perform SPI transfer */ | |
157 | if (max3107_rw(s, (u8 *)buf, (u8 *)buf, 4)) { | |
158 | dev_err(&s->spi->dev, | |
159 | "SPI transfer for GPIO data and config read failed\n"); | |
160 | return; | |
161 | } | |
162 | buf[0] &= MAX3107_SPI_RX_DATA_MASK; | |
163 | buf[1] &= MAX3107_SPI_RX_DATA_MASK; | |
164 | ||
165 | if (!(buf[1] & (0x0001 << offset))) { | |
166 | /* Configured as input, can't set value */ | |
167 | dev_warn(&s->spi->dev, | |
168 | "Trying to set value for input GPIO\n"); | |
169 | return; | |
170 | } | |
171 | ||
172 | /* Set value */ | |
173 | if (value) | |
174 | buf[0] |= (0x0001 << offset); | |
175 | else | |
176 | buf[0] &= ~(0x0001 << offset); | |
177 | ||
178 | /* Write new GPIO data register value */ | |
179 | buf[0] |= (MAX3107_WRITE_BIT | MAX3107_GPIODATA_REG); | |
180 | /* Perform SPI transfer */ | |
181 | if (max3107_rw(s, (u8 *)buf, NULL, 2)) | |
182 | dev_err(&s->spi->dev, "SPI transfer GPIO data w failed\n"); | |
183 | } | |
184 | ||
185 | /* GPIO chip data */ | |
186 | static struct gpio_chip max3107_gpio_chip = { | |
187 | .owner = THIS_MODULE, | |
188 | .direction_input = max3107_gpio_direction_in, | |
189 | .direction_output = max3107_gpio_direction_out, | |
190 | .get = max3107_gpio_get, | |
191 | .set = max3107_gpio_set, | |
192 | .can_sleep = 1, | |
193 | .base = MAX3107_GPIO_BASE, | |
194 | .ngpio = MAX3107_GPIO_COUNT, | |
195 | }; | |
196 | ||
197 | /** | |
198 | * max3107_aava_reset - reset on AAVA systems | |
199 | * @spi: The SPI device we are probing | |
200 | * | |
201 | * Reset the device ready for probing. | |
202 | */ | |
203 | ||
204 | static int max3107_aava_reset(struct spi_device *spi) | |
205 | { | |
206 | /* Reset the chip */ | |
207 | if (gpio_request(MAX3107_RESET_GPIO, "max3107")) { | |
208 | pr_err("Requesting RESET GPIO failed\n"); | |
209 | return -EIO; | |
210 | } | |
211 | if (gpio_direction_output(MAX3107_RESET_GPIO, 0)) { | |
212 | pr_err("Setting RESET GPIO to 0 failed\n"); | |
213 | gpio_free(MAX3107_RESET_GPIO); | |
214 | return -EIO; | |
215 | } | |
216 | msleep(MAX3107_RESET_DELAY); | |
217 | if (gpio_direction_output(MAX3107_RESET_GPIO, 1)) { | |
218 | pr_err("Setting RESET GPIO to 1 failed\n"); | |
219 | gpio_free(MAX3107_RESET_GPIO); | |
220 | return -EIO; | |
221 | } | |
222 | gpio_free(MAX3107_RESET_GPIO); | |
223 | msleep(MAX3107_WAKEUP_DELAY); | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static int max3107_aava_configure(struct max3107_port *s) | |
228 | { | |
229 | int retval; | |
230 | ||
231 | /* Initialize GPIO chip data */ | |
232 | s->chip = max3107_gpio_chip; | |
233 | s->chip.label = s->spi->modalias; | |
234 | s->chip.dev = &s->spi->dev; | |
235 | ||
236 | /* Add GPIO chip */ | |
237 | retval = gpiochip_add(&s->chip); | |
238 | if (retval) { | |
239 | dev_err(&s->spi->dev, "Adding GPIO chip failed\n"); | |
240 | return retval; | |
241 | } | |
242 | ||
243 | /* Temporary fix for EV2 boot problems, set modem reset to 0 */ | |
244 | max3107_gpio_direction_out(&s->chip, 3, 0); | |
245 | return 0; | |
246 | } | |
247 | ||
248 | #if 0 | |
249 | /* This will get enabled once we have the board stuff merged for this | |
250 | specific case */ | |
251 | ||
252 | static const struct baud_table brg13_ext[] = { | |
253 | { 300, MAX3107_BRG13_B300 }, | |
254 | { 600, MAX3107_BRG13_B600 }, | |
255 | { 1200, MAX3107_BRG13_B1200 }, | |
256 | { 2400, MAX3107_BRG13_B2400 }, | |
257 | { 4800, MAX3107_BRG13_B4800 }, | |
258 | { 9600, MAX3107_BRG13_B9600 }, | |
259 | { 19200, MAX3107_BRG13_B19200 }, | |
260 | { 57600, MAX3107_BRG13_B57600 }, | |
261 | { 115200, MAX3107_BRG13_B115200 }, | |
262 | { 230400, MAX3107_BRG13_B230400 }, | |
263 | { 460800, MAX3107_BRG13_B460800 }, | |
264 | { 921600, MAX3107_BRG13_B921600 }, | |
265 | { 0, 0 } | |
266 | }; | |
267 | ||
268 | static void max3107_aava_init(struct max3107_port *s) | |
269 | { | |
270 | /*override for AAVA SC specific*/ | |
271 | if (mrst_platform_id() == MRST_PLATFORM_AAVA_SC) { | |
272 | if (get_koski_build_id() <= KOSKI_EV2) | |
273 | if (s->ext_clk) { | |
274 | s->brg_cfg = MAX3107_BRG13_B9600; | |
275 | s->baud_tbl = (struct baud_table *)brg13_ext; | |
276 | } | |
277 | } | |
278 | } | |
279 | #endif | |
280 | ||
281 | static int __devexit max3107_aava_remove(struct spi_device *spi) | |
282 | { | |
283 | struct max3107_port *s = dev_get_drvdata(&spi->dev); | |
284 | ||
285 | /* Remove GPIO chip */ | |
286 | if (gpiochip_remove(&s->chip)) | |
287 | dev_warn(&spi->dev, "Removing GPIO chip failed\n"); | |
288 | ||
289 | /* Then do the default remove */ | |
290 | return max3107_remove(spi); | |
291 | } | |
292 | ||
293 | /* Platform data */ | |
294 | static struct max3107_plat aava_plat_data = { | |
295 | .loopback = 0, | |
296 | .ext_clk = 1, | |
297 | /* .init = max3107_aava_init, */ | |
298 | .configure = max3107_aava_configure, | |
299 | .hw_suspend = max3107_hw_susp, | |
300 | .polled_mode = 0, | |
301 | .poll_time = 0, | |
302 | }; | |
303 | ||
304 | ||
305 | static int __devinit max3107_probe_aava(struct spi_device *spi) | |
306 | { | |
307 | int err = max3107_aava_reset(spi); | |
308 | if (err < 0) | |
309 | return err; | |
310 | return max3107_probe(spi, &aava_plat_data); | |
311 | } | |
312 | ||
313 | /* Spi driver data */ | |
314 | static struct spi_driver max3107_driver = { | |
315 | .driver = { | |
316 | .name = "aava-max3107", | |
317 | .bus = &spi_bus_type, | |
318 | .owner = THIS_MODULE, | |
319 | }, | |
320 | .probe = max3107_probe_aava, | |
321 | .remove = __devexit_p(max3107_aava_remove), | |
322 | .suspend = max3107_suspend, | |
323 | .resume = max3107_resume, | |
324 | }; | |
325 | ||
326 | /* Driver init function */ | |
327 | static int __init max3107_init(void) | |
328 | { | |
329 | return spi_register_driver(&max3107_driver); | |
330 | } | |
331 | ||
332 | /* Driver exit function */ | |
333 | static void __exit max3107_exit(void) | |
334 | { | |
335 | spi_unregister_driver(&max3107_driver); | |
336 | } | |
337 | ||
338 | module_init(max3107_init); | |
339 | module_exit(max3107_exit); | |
340 | ||
341 | MODULE_DESCRIPTION("MAX3107 driver"); | |
342 | MODULE_AUTHOR("Aavamobile"); | |
343 | MODULE_ALIAS("aava-max3107-spi"); | |
344 | MODULE_LICENSE("GPL v2"); |