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authorAlexander Shiyan <shc_work@mail.ru>2012-08-06 11:42:32 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-08-16 15:12:25 -0400
commitf65444187a66bf54af32a10902877dd0326456d1 (patch)
tree9458139d0c7dd538d68cf6fa02e5ad4542162d83 /drivers/tty/serial/max310x.c
parent9574f36fb801035f6ab0fbb1b53ce2c12c17d100 (diff)
serial: New serial driver MAX310X
This driver is a replacement for a MAX3107 driver with a lot of improvements and new features. The main differences from the old version: - Using the regmap. - Using devm_XXX-related functions. - The use of threaded IRQ with IRQF_ONESHOT flag allows the driver to the hardware that supports only level IRQ. - Improved error handling of serial port, improved FIFO handling, improved hardware & software flow control. - Advanced flags allows turn on RS-485 mode (Auto direction control). - Ability to load multiple instances of drivers. - Added support for MAX3108. - GPIO support. - Driver is quite ready for adding I2C support and support other ICs with compatible registers set (MAX3109, MAX14830). Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/max310x.c')
-rw-r--r--drivers/tty/serial/max310x.c1259
1 files changed, 1259 insertions, 0 deletions
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
new file mode 100644
index 000000000000..534e44851b7f
--- /dev/null
+++ b/drivers/tty/serial/max310x.c
@@ -0,0 +1,1259 @@
1/*
2 * Maxim (Dallas) MAX3107/8 serial driver
3 *
4 * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru>
5 *
6 * Based on max3100.c, by Christian Pellegrin <chripell@evolware.org>
7 * Based on max3110.c, by Feng Tang <feng.tang@intel.com>
8 * Based on max3107.c, by Aavamobile
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16/* TODO: MAX3109 support (Dual) */
17/* TODO: MAX14830 support (Quad) */
18
19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/serial_core.h>
22#include <linux/serial.h>
23#include <linux/tty.h>
24#include <linux/tty_flip.h>
25#include <linux/regmap.h>
26#include <linux/gpio.h>
27#include <linux/spi/spi.h>
28#include <linux/platform_data/max310x.h>
29
30#define MAX310X_MAJOR 204
31#define MAX310X_MINOR 209
32
33/* MAX310X register definitions */
34#define MAX310X_RHR_REG (0x00) /* RX FIFO */
35#define MAX310X_THR_REG (0x00) /* TX FIFO */
36#define MAX310X_IRQEN_REG (0x01) /* IRQ enable */
37#define MAX310X_IRQSTS_REG (0x02) /* IRQ status */
38#define MAX310X_LSR_IRQEN_REG (0x03) /* LSR IRQ enable */
39#define MAX310X_LSR_IRQSTS_REG (0x04) /* LSR IRQ status */
40#define MAX310X_SPCHR_IRQEN_REG (0x05) /* Special char IRQ enable */
41#define MAX310X_SPCHR_IRQSTS_REG (0x06) /* Special char IRQ status */
42#define MAX310X_STS_IRQEN_REG (0x07) /* Status IRQ enable */
43#define MAX310X_STS_IRQSTS_REG (0x08) /* Status IRQ status */
44#define MAX310X_MODE1_REG (0x09) /* MODE1 */
45#define MAX310X_MODE2_REG (0x0a) /* MODE2 */
46#define MAX310X_LCR_REG (0x0b) /* LCR */
47#define MAX310X_RXTO_REG (0x0c) /* RX timeout */
48#define MAX310X_HDPIXDELAY_REG (0x0d) /* Auto transceiver delays */
49#define MAX310X_IRDA_REG (0x0e) /* IRDA settings */
50#define MAX310X_FLOWLVL_REG (0x0f) /* Flow control levels */
51#define MAX310X_FIFOTRIGLVL_REG (0x10) /* FIFO IRQ trigger levels */
52#define MAX310X_TXFIFOLVL_REG (0x11) /* TX FIFO level */
53#define MAX310X_RXFIFOLVL_REG (0x12) /* RX FIFO level */
54#define MAX310X_FLOWCTRL_REG (0x13) /* Flow control */
55#define MAX310X_XON1_REG (0x14) /* XON1 character */
56#define MAX310X_XON2_REG (0x15) /* XON2 character */
57#define MAX310X_XOFF1_REG (0x16) /* XOFF1 character */
58#define MAX310X_XOFF2_REG (0x17) /* XOFF2 character */
59#define MAX310X_GPIOCFG_REG (0x18) /* GPIO config */
60#define MAX310X_GPIODATA_REG (0x19) /* GPIO data */
61#define MAX310X_PLLCFG_REG (0x1a) /* PLL config */
62#define MAX310X_BRGCFG_REG (0x1b) /* Baud rate generator conf */
63#define MAX310X_BRGDIVLSB_REG (0x1c) /* Baud rate divisor LSB */
64#define MAX310X_BRGDIVMSB_REG (0x1d) /* Baud rate divisor MSB */
65#define MAX310X_CLKSRC_REG (0x1e) /* Clock source */
66/* Only present in MAX3107 */
67#define MAX3107_REVID_REG (0x1f) /* Revision identification */
68
69/* IRQ register bits */
70#define MAX310X_IRQ_LSR_BIT (1 << 0) /* LSR interrupt */
71#define MAX310X_IRQ_SPCHR_BIT (1 << 1) /* Special char interrupt */
72#define MAX310X_IRQ_STS_BIT (1 << 2) /* Status interrupt */
73#define MAX310X_IRQ_RXFIFO_BIT (1 << 3) /* RX FIFO interrupt */
74#define MAX310X_IRQ_TXFIFO_BIT (1 << 4) /* TX FIFO interrupt */
75#define MAX310X_IRQ_TXEMPTY_BIT (1 << 5) /* TX FIFO empty interrupt */
76#define MAX310X_IRQ_RXEMPTY_BIT (1 << 6) /* RX FIFO empty interrupt */
77#define MAX310X_IRQ_CTS_BIT (1 << 7) /* CTS interrupt */
78
79/* LSR register bits */
80#define MAX310X_LSR_RXTO_BIT (1 << 0) /* RX timeout */
81#define MAX310X_LSR_RXOVR_BIT (1 << 1) /* RX overrun */
82#define MAX310X_LSR_RXPAR_BIT (1 << 2) /* RX parity error */
83#define MAX310X_LSR_FRERR_BIT (1 << 3) /* Frame error */
84#define MAX310X_LSR_RXBRK_BIT (1 << 4) /* RX break */
85#define MAX310X_LSR_RXNOISE_BIT (1 << 5) /* RX noise */
86#define MAX310X_LSR_CTS_BIT (1 << 7) /* CTS pin state */
87
88/* Special character register bits */
89#define MAX310X_SPCHR_XON1_BIT (1 << 0) /* XON1 character */
90#define MAX310X_SPCHR_XON2_BIT (1 << 1) /* XON2 character */
91#define MAX310X_SPCHR_XOFF1_BIT (1 << 2) /* XOFF1 character */
92#define MAX310X_SPCHR_XOFF2_BIT (1 << 3) /* XOFF2 character */
93#define MAX310X_SPCHR_BREAK_BIT (1 << 4) /* RX break */
94#define MAX310X_SPCHR_MULTIDROP_BIT (1 << 5) /* 9-bit multidrop addr char */
95
96/* Status register bits */
97#define MAX310X_STS_GPIO0_BIT (1 << 0) /* GPIO 0 interrupt */
98#define MAX310X_STS_GPIO1_BIT (1 << 1) /* GPIO 1 interrupt */
99#define MAX310X_STS_GPIO2_BIT (1 << 2) /* GPIO 2 interrupt */
100#define MAX310X_STS_GPIO3_BIT (1 << 3) /* GPIO 3 interrupt */
101#define MAX310X_STS_CLKREADY_BIT (1 << 5) /* Clock ready */
102#define MAX310X_STS_SLEEP_BIT (1 << 6) /* Sleep interrupt */
103
104/* MODE1 register bits */
105#define MAX310X_MODE1_RXDIS_BIT (1 << 0) /* RX disable */
106#define MAX310X_MODE1_TXDIS_BIT (1 << 1) /* TX disable */
107#define MAX310X_MODE1_TXHIZ_BIT (1 << 2) /* TX pin three-state */
108#define MAX310X_MODE1_RTSHIZ_BIT (1 << 3) /* RTS pin three-state */
109#define MAX310X_MODE1_TRNSCVCTRL_BIT (1 << 4) /* Transceiver ctrl enable */
110#define MAX310X_MODE1_FORCESLEEP_BIT (1 << 5) /* Force sleep mode */
111#define MAX310X_MODE1_AUTOSLEEP_BIT (1 << 6) /* Auto sleep enable */
112#define MAX310X_MODE1_IRQSEL_BIT (1 << 7) /* IRQ pin enable */
113
114/* MODE2 register bits */
115#define MAX310X_MODE2_RST_BIT (1 << 0) /* Chip reset */
116#define MAX310X_MODE2_FIFORST_BIT (1 << 1) /* FIFO reset */
117#define MAX310X_MODE2_RXTRIGINV_BIT (1 << 2) /* RX FIFO INT invert */
118#define MAX310X_MODE2_RXEMPTINV_BIT (1 << 3) /* RX FIFO empty INT invert */
119#define MAX310X_MODE2_SPCHR_BIT (1 << 4) /* Special chr detect enable */
120#define MAX310X_MODE2_LOOPBACK_BIT (1 << 5) /* Internal loopback enable */
121#define MAX310X_MODE2_MULTIDROP_BIT (1 << 6) /* 9-bit multidrop enable */
122#define MAX310X_MODE2_ECHOSUPR_BIT (1 << 7) /* ECHO suppression enable */
123
124/* LCR register bits */
125#define MAX310X_LCR_LENGTH0_BIT (1 << 0) /* Word length bit 0 */
126#define MAX310X_LCR_LENGTH1_BIT (1 << 1) /* Word length bit 1
127 *
128 * Word length bits table:
129 * 00 -> 5 bit words
130 * 01 -> 6 bit words
131 * 10 -> 7 bit words
132 * 11 -> 8 bit words
133 */
134#define MAX310X_LCR_STOPLEN_BIT (1 << 2) /* STOP length bit
135 *
136 * STOP length bit table:
137 * 0 -> 1 stop bit
138 * 1 -> 1-1.5 stop bits if
139 * word length is 5,
140 * 2 stop bits otherwise
141 */
142#define MAX310X_LCR_PARITY_BIT (1 << 3) /* Parity bit enable */
143#define MAX310X_LCR_EVENPARITY_BIT (1 << 4) /* Even parity bit enable */
144#define MAX310X_LCR_FORCEPARITY_BIT (1 << 5) /* 9-bit multidrop parity */
145#define MAX310X_LCR_TXBREAK_BIT (1 << 6) /* TX break enable */
146#define MAX310X_LCR_RTS_BIT (1 << 7) /* RTS pin control */
147#define MAX310X_LCR_WORD_LEN_5 (0x00)
148#define MAX310X_LCR_WORD_LEN_6 (0x01)
149#define MAX310X_LCR_WORD_LEN_7 (0x02)
150#define MAX310X_LCR_WORD_LEN_8 (0x03)
151
152/* IRDA register bits */
153#define MAX310X_IRDA_IRDAEN_BIT (1 << 0) /* IRDA mode enable */
154#define MAX310X_IRDA_SIR_BIT (1 << 1) /* SIR mode enable */
155#define MAX310X_IRDA_SHORTIR_BIT (1 << 2) /* Short SIR mode enable */
156#define MAX310X_IRDA_MIR_BIT (1 << 3) /* MIR mode enable */
157#define MAX310X_IRDA_RXINV_BIT (1 << 4) /* RX logic inversion enable */
158#define MAX310X_IRDA_TXINV_BIT (1 << 5) /* TX logic inversion enable */
159
160/* Flow control trigger level register masks */
161#define MAX310X_FLOWLVL_HALT_MASK (0x000f) /* Flow control halt level */
162#define MAX310X_FLOWLVL_RES_MASK (0x00f0) /* Flow control resume level */
163#define MAX310X_FLOWLVL_HALT(words) ((words / 8) & 0x0f)
164#define MAX310X_FLOWLVL_RES(words) (((words / 8) & 0x0f) << 4)
165
166/* FIFO interrupt trigger level register masks */
167#define MAX310X_FIFOTRIGLVL_TX_MASK (0x0f) /* TX FIFO trigger level */
168#define MAX310X_FIFOTRIGLVL_RX_MASK (0xf0) /* RX FIFO trigger level */
169#define MAX310X_FIFOTRIGLVL_TX(words) ((words / 8) & 0x0f)
170#define MAX310X_FIFOTRIGLVL_RX(words) (((words / 8) & 0x0f) << 4)
171
172/* Flow control register bits */
173#define MAX310X_FLOWCTRL_AUTORTS_BIT (1 << 0) /* Auto RTS flow ctrl enable */
174#define MAX310X_FLOWCTRL_AUTOCTS_BIT (1 << 1) /* Auto CTS flow ctrl enable */
175#define MAX310X_FLOWCTRL_GPIADDR_BIT (1 << 2) /* Enables that GPIO inputs
176 * are used in conjunction with
177 * XOFF2 for definition of
178 * special character */
179#define MAX310X_FLOWCTRL_SWFLOWEN_BIT (1 << 3) /* Auto SW flow ctrl enable */
180#define MAX310X_FLOWCTRL_SWFLOW0_BIT (1 << 4) /* SWFLOW bit 0 */
181#define MAX310X_FLOWCTRL_SWFLOW1_BIT (1 << 5) /* SWFLOW bit 1
182 *
183 * SWFLOW bits 1 & 0 table:
184 * 00 -> no transmitter flow
185 * control
186 * 01 -> receiver compares
187 * XON2 and XOFF2
188 * and controls
189 * transmitter
190 * 10 -> receiver compares
191 * XON1 and XOFF1
192 * and controls
193 * transmitter
194 * 11 -> receiver compares
195 * XON1, XON2, XOFF1 and
196 * XOFF2 and controls
197 * transmitter
198 */
199#define MAX310X_FLOWCTRL_SWFLOW2_BIT (1 << 6) /* SWFLOW bit 2 */
200#define MAX310X_FLOWCTRL_SWFLOW3_BIT (1 << 7) /* SWFLOW bit 3
201 *
202 * SWFLOW bits 3 & 2 table:
203 * 00 -> no received flow
204 * control
205 * 01 -> transmitter generates
206 * XON2 and XOFF2
207 * 10 -> transmitter generates
208 * XON1 and XOFF1
209 * 11 -> transmitter generates
210 * XON1, XON2, XOFF1 and
211 * XOFF2
212 */
213
214/* GPIO configuration register bits */
215#define MAX310X_GPIOCFG_GP0OUT_BIT (1 << 0) /* GPIO 0 output enable */
216#define MAX310X_GPIOCFG_GP1OUT_BIT (1 << 1) /* GPIO 1 output enable */
217#define MAX310X_GPIOCFG_GP2OUT_BIT (1 << 2) /* GPIO 2 output enable */
218#define MAX310X_GPIOCFG_GP3OUT_BIT (1 << 3) /* GPIO 3 output enable */
219#define MAX310X_GPIOCFG_GP0OD_BIT (1 << 4) /* GPIO 0 open-drain enable */
220#define MAX310X_GPIOCFG_GP1OD_BIT (1 << 5) /* GPIO 1 open-drain enable */
221#define MAX310X_GPIOCFG_GP2OD_BIT (1 << 6) /* GPIO 2 open-drain enable */
222#define MAX310X_GPIOCFG_GP3OD_BIT (1 << 7) /* GPIO 3 open-drain enable */
223
224/* GPIO DATA register bits */
225#define MAX310X_GPIODATA_GP0OUT_BIT (1 << 0) /* GPIO 0 output value */
226#define MAX310X_GPIODATA_GP1OUT_BIT (1 << 1) /* GPIO 1 output value */
227#define MAX310X_GPIODATA_GP2OUT_BIT (1 << 2) /* GPIO 2 output value */
228#define MAX310X_GPIODATA_GP3OUT_BIT (1 << 3) /* GPIO 3 output value */
229#define MAX310X_GPIODATA_GP0IN_BIT (1 << 4) /* GPIO 0 input value */
230#define MAX310X_GPIODATA_GP1IN_BIT (1 << 5) /* GPIO 1 input value */
231#define MAX310X_GPIODATA_GP2IN_BIT (1 << 6) /* GPIO 2 input value */
232#define MAX310X_GPIODATA_GP3IN_BIT (1 << 7) /* GPIO 3 input value */
233
234/* PLL configuration register masks */
235#define MAX310X_PLLCFG_PREDIV_MASK (0x3f) /* PLL predivision value */
236#define MAX310X_PLLCFG_PLLFACTOR_MASK (0xc0) /* PLL multiplication factor */
237
238/* Baud rate generator configuration register bits */
239#define MAX310X_BRGCFG_2XMODE_BIT (1 << 4) /* Double baud rate */
240#define MAX310X_BRGCFG_4XMODE_BIT (1 << 5) /* Quadruple baud rate */
241
242/* Clock source register bits */
243#define MAX310X_CLKSRC_CRYST_BIT (1 << 1) /* Crystal osc enable */
244#define MAX310X_CLKSRC_PLL_BIT (1 << 2) /* PLL enable */
245#define MAX310X_CLKSRC_PLLBYP_BIT (1 << 3) /* PLL bypass */
246#define MAX310X_CLKSRC_EXTCLK_BIT (1 << 4) /* External clock enable */
247#define MAX310X_CLKSRC_CLK2RTS_BIT (1 << 7) /* Baud clk to RTS pin */
248
249/* Misc definitions */
250#define MAX310X_FIFO_SIZE (128)
251
252/* MAX3107 specific */
253#define MAX3107_REV_ID (0xa0)
254#define MAX3107_REV_MASK (0xfe)
255
256/* IRQ status bits definitions */
257#define MAX310X_IRQ_TX (MAX310X_IRQ_TXFIFO_BIT | \
258 MAX310X_IRQ_TXEMPTY_BIT)
259#define MAX310X_IRQ_RX (MAX310X_IRQ_RXFIFO_BIT | \
260 MAX310X_IRQ_RXEMPTY_BIT)
261
262/* Supported chip types */
263enum {
264 MAX310X_TYPE_MAX3107 = 3107,
265 MAX310X_TYPE_MAX3108 = 3108,
266};
267
268struct max310x_port {
269 struct uart_driver uart;
270 struct uart_port port;
271
272 const char *name;
273 int uartclk;
274
275 unsigned int nr_gpio;
276#ifdef CONFIG_GPIOLIB
277 struct gpio_chip gpio;
278#endif
279
280 struct regmap *regmap;
281 struct regmap_config regcfg;
282
283 struct workqueue_struct *wq;
284 struct work_struct tx_work;
285
286 struct mutex max310x_mutex;
287
288 struct max310x_pdata *pdata;
289};
290
291static bool max3107_8_reg_writeable(struct device *dev, unsigned int reg)
292{
293 switch (reg) {
294 case MAX310X_IRQSTS_REG:
295 case MAX310X_LSR_IRQSTS_REG:
296 case MAX310X_SPCHR_IRQSTS_REG:
297 case MAX310X_STS_IRQSTS_REG:
298 case MAX310X_TXFIFOLVL_REG:
299 case MAX310X_RXFIFOLVL_REG:
300 case MAX3107_REVID_REG: /* Only available on MAX3107 */
301 return false;
302 default:
303 break;
304 }
305
306 return true;
307}
308
309static bool max310x_reg_volatile(struct device *dev, unsigned int reg)
310{
311 switch (reg) {
312 case MAX310X_RHR_REG:
313 case MAX310X_IRQSTS_REG:
314 case MAX310X_LSR_IRQSTS_REG:
315 case MAX310X_SPCHR_IRQSTS_REG:
316 case MAX310X_STS_IRQSTS_REG:
317 case MAX310X_TXFIFOLVL_REG:
318 case MAX310X_RXFIFOLVL_REG:
319 case MAX310X_GPIODATA_REG:
320 return true;
321 default:
322 break;
323 }
324
325 return false;
326}
327
328static bool max310x_reg_precious(struct device *dev, unsigned int reg)
329{
330 switch (reg) {
331 case MAX310X_RHR_REG:
332 case MAX310X_IRQSTS_REG:
333 case MAX310X_SPCHR_IRQSTS_REG:
334 case MAX310X_STS_IRQSTS_REG:
335 return true;
336 default:
337 break;
338 }
339
340 return false;
341}
342
343static void max310x_set_baud(struct max310x_port *s, int baud)
344{
345 unsigned int mode = 0, div = s->uartclk / baud;
346
347 if (!(div / 16)) {
348 /* Mode x2 */
349 mode = MAX310X_BRGCFG_2XMODE_BIT;
350 div = (s->uartclk * 2) / baud;
351 }
352
353 if (!(div / 16)) {
354 /* Mode x4 */
355 mode = MAX310X_BRGCFG_4XMODE_BIT;
356 div = (s->uartclk * 4) / baud;
357 }
358
359 regmap_write(s->regmap, MAX310X_BRGDIVMSB_REG,
360 ((div / 16) >> 8) & 0xff);
361 regmap_write(s->regmap, MAX310X_BRGDIVLSB_REG, (div / 16) & 0xff);
362 regmap_write(s->regmap, MAX310X_BRGCFG_REG, (div % 16) | mode);
363}
364
365static void max310x_wait_pll(struct max310x_port *s)
366{
367 int tryes = 1000;
368
369 /* Wait for PLL only if crystal is used */
370 if (!(s->pdata->driver_flags & MAX310X_EXT_CLK)) {
371 unsigned int sts = 0;
372
373 while (tryes--) {
374 regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &sts);
375 if (sts & MAX310X_STS_CLKREADY_BIT)
376 break;
377 }
378 }
379}
380
381static int __devinit max310x_update_best_err(unsigned long f, long *besterr)
382{
383 /* Use baudrate 115200 for calculate error */
384 long err = f % (115200 * 16);
385
386 if ((*besterr < 0) || (*besterr > err)) {
387 *besterr = err;
388 return 0;
389 }
390
391 return 1;
392}
393
394static int __devinit max310x_set_ref_clk(struct max310x_port *s)
395{
396 unsigned int div, clksrc, pllcfg = 0;
397 long besterr = -1;
398 unsigned long fdiv, fmul, bestfreq = s->pdata->frequency;
399
400 /* First, update error without PLL */
401 max310x_update_best_err(s->pdata->frequency, &besterr);
402
403 /* Try all possible PLL dividers */
404 for (div = 1; (div <= 63) && besterr; div++) {
405 fdiv = DIV_ROUND_CLOSEST(s->pdata->frequency, div);
406
407 /* Try multiplier 6 */
408 fmul = fdiv * 6;
409 if ((fdiv >= 500000) && (fdiv <= 800000))
410 if (!max310x_update_best_err(fmul, &besterr)) {
411 pllcfg = (0 << 6) | div;
412 bestfreq = fmul;
413 }
414 /* Try multiplier 48 */
415 fmul = fdiv * 48;
416 if ((fdiv >= 850000) && (fdiv <= 1200000))
417 if (!max310x_update_best_err(fmul, &besterr)) {
418 pllcfg = (1 << 6) | div;
419 bestfreq = fmul;
420 }
421 /* Try multiplier 96 */
422 fmul = fdiv * 96;
423 if ((fdiv >= 425000) && (fdiv <= 1000000))
424 if (!max310x_update_best_err(fmul, &besterr)) {
425 pllcfg = (2 << 6) | div;
426 bestfreq = fmul;
427 }
428 /* Try multiplier 144 */
429 fmul = fdiv * 144;
430 if ((fdiv >= 390000) && (fdiv <= 667000))
431 if (!max310x_update_best_err(fmul, &besterr)) {
432 pllcfg = (3 << 6) | div;
433 bestfreq = fmul;
434 }
435 }
436
437 /* Configure clock source */
438 if (s->pdata->driver_flags & MAX310X_EXT_CLK)
439 clksrc = MAX310X_CLKSRC_EXTCLK_BIT;
440 else
441 clksrc = MAX310X_CLKSRC_CRYST_BIT;
442
443 /* Configure PLL */
444 if (pllcfg) {
445 clksrc |= MAX310X_CLKSRC_PLL_BIT;
446 regmap_write(s->regmap, MAX310X_PLLCFG_REG, pllcfg);
447 } else
448 clksrc |= MAX310X_CLKSRC_PLLBYP_BIT;
449
450 regmap_write(s->regmap, MAX310X_CLKSRC_REG, clksrc);
451
452 if (pllcfg)
453 max310x_wait_pll(s);
454
455 dev_dbg(s->port.dev, "Reference clock set to %lu Hz\n", bestfreq);
456
457 return (int)bestfreq;
458}
459
460static void max310x_handle_rx(struct max310x_port *s, unsigned int rxlen)
461{
462 unsigned int sts = 0, ch = 0, flag;
463 struct tty_struct *tty = tty_port_tty_get(&s->port.state->port);
464
465 if (!tty)
466 return;
467
468 if (unlikely(rxlen >= MAX310X_FIFO_SIZE)) {
469 dev_warn(s->port.dev, "Possible RX FIFO overrun %d\n", rxlen);
470 /* Ensure sanity of RX level */
471 rxlen = MAX310X_FIFO_SIZE;
472 }
473
474 dev_dbg(s->port.dev, "RX Len = %u\n", rxlen);
475
476 while (rxlen--) {
477 regmap_read(s->regmap, MAX310X_RHR_REG, &ch);
478 regmap_read(s->regmap, MAX310X_LSR_IRQSTS_REG, &sts);
479
480 sts &= MAX310X_LSR_RXPAR_BIT | MAX310X_LSR_FRERR_BIT |
481 MAX310X_LSR_RXOVR_BIT | MAX310X_LSR_RXBRK_BIT;
482
483 s->port.icount.rx++;
484 flag = TTY_NORMAL;
485
486 if (unlikely(sts)) {
487 if (sts & MAX310X_LSR_RXBRK_BIT) {
488 s->port.icount.brk++;
489 if (uart_handle_break(&s->port))
490 continue;
491 } else if (sts & MAX310X_LSR_RXPAR_BIT)
492 s->port.icount.parity++;
493 else if (sts & MAX310X_LSR_FRERR_BIT)
494 s->port.icount.frame++;
495 else if (sts & MAX310X_LSR_RXOVR_BIT)
496 s->port.icount.overrun++;
497
498 sts &= s->port.read_status_mask;
499 if (sts & MAX310X_LSR_RXBRK_BIT)
500 flag = TTY_BREAK;
501 else if (sts & MAX310X_LSR_RXPAR_BIT)
502 flag = TTY_PARITY;
503 else if (sts & MAX310X_LSR_FRERR_BIT)
504 flag = TTY_FRAME;
505 else if (sts & MAX310X_LSR_RXOVR_BIT)
506 flag = TTY_OVERRUN;
507 }
508
509 if (uart_handle_sysrq_char(s->port, ch))
510 continue;
511
512 if (sts & s->port.ignore_status_mask)
513 continue;
514
515 uart_insert_char(&s->port, sts, MAX310X_LSR_RXOVR_BIT,
516 ch, flag);
517 }
518
519 tty_flip_buffer_push(tty);
520
521 tty_kref_put(tty);
522}
523
524static void max310x_handle_tx(struct max310x_port *s)
525{
526 struct circ_buf *xmit = &s->port.state->xmit;
527 unsigned int txlen = 0, to_send;
528
529 if (unlikely(s->port.x_char)) {
530 regmap_write(s->regmap, MAX310X_THR_REG, s->port.x_char);
531 s->port.icount.tx++;
532 s->port.x_char = 0;
533 return;
534 }
535
536 if (uart_circ_empty(xmit) || uart_tx_stopped(&s->port))
537 return;
538
539 /* Get length of data pending in circular buffer */
540 to_send = uart_circ_chars_pending(xmit);
541 if (likely(to_send)) {
542 /* Limit to size of TX FIFO */
543 regmap_read(s->regmap, MAX310X_TXFIFOLVL_REG, &txlen);
544 txlen = MAX310X_FIFO_SIZE - txlen;
545 to_send = (to_send > txlen) ? txlen : to_send;
546
547 dev_dbg(s->port.dev, "TX Len = %u\n", to_send);
548
549 /* Add data to send */
550 s->port.icount.tx += to_send;
551 while (to_send--) {
552 regmap_write(s->regmap, MAX310X_THR_REG,
553 xmit->buf[xmit->tail]);
554 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
555 };
556 }
557
558 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
559 uart_write_wakeup(&s->port);
560}
561
562static irqreturn_t max310x_ist(int irq, void *dev_id)
563{
564 struct max310x_port *s = (struct max310x_port *)dev_id;
565 unsigned int ists = 0, lsr = 0, rxlen = 0;
566
567 mutex_lock(&s->max310x_mutex);
568
569 for (;;) {
570 /* Read IRQ status & RX FIFO level */
571 regmap_read(s->regmap, MAX310X_IRQSTS_REG, &ists);
572 regmap_read(s->regmap, MAX310X_LSR_IRQSTS_REG, &lsr);
573 regmap_read(s->regmap, MAX310X_RXFIFOLVL_REG, &rxlen);
574 if (!ists && !(lsr & MAX310X_LSR_RXTO_BIT) && !rxlen)
575 break;
576
577 dev_dbg(s->port.dev, "IRQ status: 0x%02x\n", ists);
578
579 if (rxlen)
580 max310x_handle_rx(s, rxlen);
581 if (ists & MAX310X_IRQ_TX)
582 max310x_handle_tx(s);
583 if (ists & MAX310X_IRQ_CTS_BIT)
584 uart_handle_cts_change(&s->port,
585 !!(lsr & MAX310X_LSR_CTS_BIT));
586 }
587
588 mutex_unlock(&s->max310x_mutex);
589
590 return IRQ_HANDLED;
591}
592
593static void max310x_wq_proc(struct work_struct *ws)
594{
595 struct max310x_port *s = container_of(ws, struct max310x_port, tx_work);
596
597 mutex_lock(&s->max310x_mutex);
598 max310x_handle_tx(s);
599 mutex_unlock(&s->max310x_mutex);
600}
601
602static void max310x_start_tx(struct uart_port *port)
603{
604 struct max310x_port *s = container_of(port, struct max310x_port, port);
605
606 queue_work(s->wq, &s->tx_work);
607}
608
609static void max310x_stop_tx(struct uart_port *port)
610{
611 /* Do nothing */
612}
613
614static void max310x_stop_rx(struct uart_port *port)
615{
616 /* Do nothing */
617}
618
619static unsigned int max310x_tx_empty(struct uart_port *port)
620{
621 unsigned int val = 0;
622 struct max310x_port *s = container_of(port, struct max310x_port, port);
623
624 mutex_lock(&s->max310x_mutex);
625 regmap_read(s->regmap, MAX310X_TXFIFOLVL_REG, &val);
626 mutex_unlock(&s->max310x_mutex);
627
628 return val ? 0 : TIOCSER_TEMT;
629}
630
631static void max310x_enable_ms(struct uart_port *port)
632{
633 /* Modem status not supported */
634}
635
636static unsigned int max310x_get_mctrl(struct uart_port *port)
637{
638 /* DCD and DSR are not wired and CTS/RTS is handled automatically
639 * so just indicate DSR and CAR asserted
640 */
641 return TIOCM_DSR | TIOCM_CAR;
642}
643
644static void max310x_set_mctrl(struct uart_port *port, unsigned int mctrl)
645{
646 /* DCD and DSR are not wired and CTS/RTS is hadnled automatically
647 * so do nothing
648 */
649}
650
651static void max310x_break_ctl(struct uart_port *port, int break_state)
652{
653 struct max310x_port *s = container_of(port, struct max310x_port, port);
654
655 mutex_lock(&s->max310x_mutex);
656 regmap_update_bits(s->regmap, MAX310X_LCR_REG,
657 MAX310X_LCR_TXBREAK_BIT,
658 break_state ? MAX310X_LCR_TXBREAK_BIT : 0);
659 mutex_unlock(&s->max310x_mutex);
660}
661
662static void max310x_set_termios(struct uart_port *port,
663 struct ktermios *termios,
664 struct ktermios *old)
665{
666 struct max310x_port *s = container_of(port, struct max310x_port, port);
667 unsigned int lcr, flow = 0;
668 int baud;
669
670 mutex_lock(&s->max310x_mutex);
671
672 /* Mask termios capabilities we don't support */
673 termios->c_cflag &= ~CMSPAR;
674 termios->c_iflag &= ~IXANY;
675
676 /* Word size */
677 switch (termios->c_cflag & CSIZE) {
678 case CS5:
679 lcr = MAX310X_LCR_WORD_LEN_5;
680 break;
681 case CS6:
682 lcr = MAX310X_LCR_WORD_LEN_6;
683 break;
684 case CS7:
685 lcr = MAX310X_LCR_WORD_LEN_7;
686 break;
687 case CS8:
688 default:
689 lcr = MAX310X_LCR_WORD_LEN_8;
690 break;
691 }
692
693 /* Parity */
694 if (termios->c_cflag & PARENB) {
695 lcr |= MAX310X_LCR_PARITY_BIT;
696 if (!(termios->c_cflag & PARODD))
697 lcr |= MAX310X_LCR_EVENPARITY_BIT;
698 }
699
700 /* Stop bits */
701 if (termios->c_cflag & CSTOPB)
702 lcr |= MAX310X_LCR_STOPLEN_BIT; /* 2 stops */
703
704 /* Update LCR register */
705 regmap_write(s->regmap, MAX310X_LCR_REG, lcr);
706
707 /* Set read status mask */
708 port->read_status_mask = MAX310X_LSR_RXOVR_BIT;
709 if (termios->c_iflag & INPCK)
710 port->read_status_mask |= MAX310X_LSR_RXPAR_BIT |
711 MAX310X_LSR_FRERR_BIT;
712 if (termios->c_iflag & (BRKINT | PARMRK))
713 port->read_status_mask |= MAX310X_LSR_RXBRK_BIT;
714
715 /* Set status ignore mask */
716 port->ignore_status_mask = 0;
717 if (termios->c_iflag & IGNBRK)
718 port->ignore_status_mask |= MAX310X_LSR_RXBRK_BIT;
719 if (!(termios->c_cflag & CREAD))
720 port->ignore_status_mask |= MAX310X_LSR_RXPAR_BIT |
721 MAX310X_LSR_RXOVR_BIT |
722 MAX310X_LSR_FRERR_BIT |
723 MAX310X_LSR_RXBRK_BIT;
724
725 /* Configure flow control */
726 regmap_write(s->regmap, MAX310X_XON1_REG, termios->c_cc[VSTART]);
727 regmap_write(s->regmap, MAX310X_XOFF1_REG, termios->c_cc[VSTOP]);
728 if (termios->c_cflag & CRTSCTS)
729 flow |= MAX310X_FLOWCTRL_AUTOCTS_BIT |
730 MAX310X_FLOWCTRL_AUTORTS_BIT;
731 if (termios->c_iflag & IXON)
732 flow |= MAX310X_FLOWCTRL_SWFLOW3_BIT |
733 MAX310X_FLOWCTRL_SWFLOWEN_BIT;
734 if (termios->c_iflag & IXOFF)
735 flow |= MAX310X_FLOWCTRL_SWFLOW1_BIT |
736 MAX310X_FLOWCTRL_SWFLOWEN_BIT;
737 regmap_write(s->regmap, MAX310X_FLOWCTRL_REG, flow);
738
739 /* Get baud rate generator configuration */
740 baud = uart_get_baud_rate(port, termios, old,
741 port->uartclk / 16 / 0xffff,
742 port->uartclk / 4);
743
744 /* Setup baudrate generator */
745 max310x_set_baud(s, baud);
746
747 /* Update timeout according to new baud rate */
748 uart_update_timeout(port, termios->c_cflag, baud);
749
750 mutex_unlock(&s->max310x_mutex);
751}
752
753static int max310x_startup(struct uart_port *port)
754{
755 unsigned int val, line = port->line;
756 struct max310x_port *s = container_of(port, struct max310x_port, port);
757
758 if (s->pdata->suspend)
759 s->pdata->suspend(0);
760
761 mutex_lock(&s->max310x_mutex);
762
763 /* Configure baud rate, 9600 as default */
764 max310x_set_baud(s, 9600);
765
766 /* Configure LCR register, 8N1 mode by default */
767 val = MAX310X_LCR_WORD_LEN_8;
768 regmap_write(s->regmap, MAX310X_LCR_REG, val);
769
770 /* Configure MODE1 register */
771 regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
772 MAX310X_MODE1_TRNSCVCTRL_BIT,
773 (s->pdata->uart_flags[line] & MAX310X_AUTO_DIR_CTRL)
774 ? MAX310X_MODE1_TRNSCVCTRL_BIT : 0);
775
776 /* Configure MODE2 register */
777 val = MAX310X_MODE2_RXEMPTINV_BIT;
778 if (s->pdata->uart_flags[line] & MAX310X_LOOPBACK)
779 val |= MAX310X_MODE2_LOOPBACK_BIT;
780 if (s->pdata->uart_flags[line] & MAX310X_ECHO_SUPRESS)
781 val |= MAX310X_MODE2_ECHOSUPR_BIT;
782
783 /* Reset FIFOs */
784 val |= MAX310X_MODE2_FIFORST_BIT;
785 regmap_write(s->regmap, MAX310X_MODE2_REG, val);
786
787 /* Configure FIFO trigger level register */
788 /* RX FIFO trigger for 16 words, TX FIFO trigger for 64 words */
789 val = MAX310X_FIFOTRIGLVL_RX(16) | MAX310X_FIFOTRIGLVL_TX(64);
790 regmap_write(s->regmap, MAX310X_FIFOTRIGLVL_REG, val);
791
792 /* Configure flow control levels */
793 /* Flow control halt level 96, resume level 48 */
794 val = MAX310X_FLOWLVL_RES(48) | MAX310X_FLOWLVL_HALT(96);
795 regmap_write(s->regmap, MAX310X_FLOWLVL_REG, val);
796
797 /* Clear timeout register */
798 regmap_write(s->regmap, MAX310X_RXTO_REG, 0);
799
800 /* Configure LSR interrupt enable register */
801 /* Enable RX timeout interrupt */
802 val = MAX310X_LSR_RXTO_BIT;
803 regmap_write(s->regmap, MAX310X_LSR_IRQEN_REG, val);
804
805 /* Clear FIFO reset */
806 regmap_update_bits(s->regmap, MAX310X_MODE2_REG,
807 MAX310X_MODE2_FIFORST_BIT, 0);
808
809 /* Clear IRQ status register by reading it */
810 regmap_read(s->regmap, MAX310X_IRQSTS_REG, &val);
811
812 /* Configure interrupt enable register */
813 /* Enable CTS change interrupt */
814 val = MAX310X_IRQ_CTS_BIT;
815 /* Enable RX, TX interrupts */
816 val |= MAX310X_IRQ_RX | MAX310X_IRQ_TX;
817 regmap_write(s->regmap, MAX310X_IRQEN_REG, val);
818
819 mutex_unlock(&s->max310x_mutex);
820
821 return 0;
822}
823
824static void max310x_shutdown(struct uart_port *port)
825{
826 struct max310x_port *s = container_of(port, struct max310x_port, port);
827
828 /* Disable all interrupts */
829 mutex_lock(&s->max310x_mutex);
830 regmap_write(s->regmap, MAX310X_IRQEN_REG, 0);
831 mutex_unlock(&s->max310x_mutex);
832
833 if (s->pdata->suspend)
834 s->pdata->suspend(1);
835}
836
837static const char *max310x_type(struct uart_port *port)
838{
839 struct max310x_port *s = container_of(port, struct max310x_port, port);
840
841 return (port->type == PORT_MAX310X) ? s->name : NULL;
842}
843
844static int max310x_request_port(struct uart_port *port)
845{
846 /* Do nothing */
847 return 0;
848}
849
850static void max310x_release_port(struct uart_port *port)
851{
852 /* Do nothing */
853}
854
855static void max310x_config_port(struct uart_port *port, int flags)
856{
857 if (flags & UART_CONFIG_TYPE)
858 port->type = PORT_MAX310X;
859}
860
861static int max310x_verify_port(struct uart_port *port, struct serial_struct *ser)
862{
863 if ((ser->type == PORT_UNKNOWN) || (ser->type == PORT_MAX310X))
864 return 0;
865 if (ser->irq == port->irq)
866 return 0;
867
868 return -EINVAL;
869}
870
871static struct uart_ops max310x_ops = {
872 .tx_empty = max310x_tx_empty,
873 .set_mctrl = max310x_set_mctrl,
874 .get_mctrl = max310x_get_mctrl,
875 .stop_tx = max310x_stop_tx,
876 .start_tx = max310x_start_tx,
877 .stop_rx = max310x_stop_rx,
878 .enable_ms = max310x_enable_ms,
879 .break_ctl = max310x_break_ctl,
880 .startup = max310x_startup,
881 .shutdown = max310x_shutdown,
882 .set_termios = max310x_set_termios,
883 .type = max310x_type,
884 .request_port = max310x_request_port,
885 .release_port = max310x_release_port,
886 .config_port = max310x_config_port,
887 .verify_port = max310x_verify_port,
888};
889
890static int max310x_suspend(struct spi_device *spi, pm_message_t state)
891{
892 int ret;
893 struct max310x_port *s = dev_get_drvdata(&spi->dev);
894
895 dev_dbg(&spi->dev, "Suspend\n");
896
897 ret = uart_suspend_port(&s->uart, &s->port);
898
899 mutex_lock(&s->max310x_mutex);
900
901 /* Enable sleep mode */
902 regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
903 MAX310X_MODE1_FORCESLEEP_BIT,
904 MAX310X_MODE1_FORCESLEEP_BIT);
905
906 mutex_unlock(&s->max310x_mutex);
907
908 if (s->pdata->suspend)
909 s->pdata->suspend(1);
910
911 return ret;
912}
913
914static int max310x_resume(struct spi_device *spi)
915{
916 struct max310x_port *s = dev_get_drvdata(&spi->dev);
917
918 dev_dbg(&spi->dev, "Resume\n");
919
920 if (s->pdata->suspend)
921 s->pdata->suspend(0);
922
923 mutex_lock(&s->max310x_mutex);
924
925 /* Disable sleep mode */
926 regmap_update_bits(s->regmap, MAX310X_MODE1_REG,
927 MAX310X_MODE1_FORCESLEEP_BIT,
928 0);
929
930 max310x_wait_pll(s);
931
932 mutex_unlock(&s->max310x_mutex);
933
934 return uart_resume_port(&s->uart, &s->port);
935}
936
937#ifdef CONFIG_GPIOLIB
938static int max310x_gpio_get(struct gpio_chip *chip, unsigned offset)
939{
940 unsigned int val = 0;
941 struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
942
943 mutex_lock(&s->max310x_mutex);
944 regmap_read(s->regmap, MAX310X_GPIODATA_REG, &val);
945 mutex_unlock(&s->max310x_mutex);
946
947 return !!((val >> 4) & (1 << offset));
948}
949
950static void max310x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
951{
952 struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
953
954 mutex_lock(&s->max310x_mutex);
955 regmap_update_bits(s->regmap, MAX310X_GPIODATA_REG, 1 << offset, value ?
956 1 << offset : 0);
957 mutex_unlock(&s->max310x_mutex);
958}
959
960static int max310x_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
961{
962 struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
963
964 mutex_lock(&s->max310x_mutex);
965
966 regmap_update_bits(s->regmap, MAX310X_GPIOCFG_REG, 1 << offset, 0);
967
968 mutex_unlock(&s->max310x_mutex);
969
970 return 0;
971}
972
973static int max310x_gpio_direction_output(struct gpio_chip *chip,
974 unsigned offset, int value)
975{
976 struct max310x_port *s = container_of(chip, struct max310x_port, gpio);
977
978 mutex_lock(&s->max310x_mutex);
979
980 regmap_update_bits(s->regmap, MAX310X_GPIOCFG_REG, 1 << offset,
981 1 << offset);
982 regmap_update_bits(s->regmap, MAX310X_GPIODATA_REG, 1 << offset, value ?
983 1 << offset : 0);
984
985 mutex_unlock(&s->max310x_mutex);
986
987 return 0;
988}
989#endif
990
991/* Generic platform data */
992static struct max310x_pdata generic_plat_data = {
993 .driver_flags = MAX310X_EXT_CLK,
994 .uart_flags[0] = MAX310X_ECHO_SUPRESS,
995 .frequency = 26000000,
996};
997
998static int __devinit max310x_probe(struct spi_device *spi)
999{
1000 struct max310x_port *s;
1001 struct device *dev = &spi->dev;
1002 int chiptype = spi_get_device_id(spi)->driver_data;
1003 struct max310x_pdata *pdata = dev->platform_data;
1004 unsigned int val = 0;
1005 int ret;
1006
1007 /* Check for IRQ */
1008 if (spi->irq <= 0) {
1009 dev_err(dev, "No IRQ specified\n");
1010 return -ENOTSUPP;
1011 }
1012
1013 /* Alloc port structure */
1014 s = devm_kzalloc(dev, sizeof(struct max310x_port), GFP_KERNEL);
1015 if (!s) {
1016 dev_err(dev, "Error allocating port structure\n");
1017 return -ENOMEM;
1018 }
1019 dev_set_drvdata(dev, s);
1020
1021 if (!pdata) {
1022 dev_warn(dev, "No platform data supplied, using defaults\n");
1023 pdata = &generic_plat_data;
1024 }
1025 s->pdata = pdata;
1026
1027 /* Individual chip settings */
1028 switch (chiptype) {
1029 case MAX310X_TYPE_MAX3107:
1030 s->name = "MAX3107";
1031 s->nr_gpio = 4;
1032 s->uart.nr = 1;
1033 s->regcfg.max_register = 0x1f;
1034 break;
1035 case MAX310X_TYPE_MAX3108:
1036 s->name = "MAX3108";
1037 s->nr_gpio = 4;
1038 s->uart.nr = 1;
1039 s->regcfg.max_register = 0x1e;
1040 break;
1041 default:
1042 dev_err(dev, "Unsupported chip type %i\n", chiptype);
1043 return -ENOTSUPP;
1044 }
1045
1046 /* Check input frequency */
1047 if ((pdata->driver_flags & MAX310X_EXT_CLK) &&
1048 ((pdata->frequency < 500000) || (pdata->frequency > 35000000)))
1049 goto err_freq;
1050 /* Check frequency for quartz */
1051 if (!(pdata->driver_flags & MAX310X_EXT_CLK) &&
1052 ((pdata->frequency < 1000000) || (pdata->frequency > 4000000)))
1053 goto err_freq;
1054
1055 mutex_init(&s->max310x_mutex);
1056
1057 /* Setup SPI bus */
1058 spi->mode = SPI_MODE_0;
1059 spi->bits_per_word = 8;
1060 spi->max_speed_hz = 26000000;
1061 spi_setup(spi);
1062
1063 /* Setup regmap */
1064 s->regcfg.reg_bits = 8;
1065 s->regcfg.val_bits = 8;
1066 s->regcfg.read_flag_mask = 0x00;
1067 s->regcfg.write_flag_mask = 0x80;
1068 s->regcfg.cache_type = REGCACHE_RBTREE;
1069 s->regcfg.writeable_reg = max3107_8_reg_writeable;
1070 s->regcfg.volatile_reg = max310x_reg_volatile;
1071 s->regcfg.precious_reg = max310x_reg_precious;
1072 s->regmap = devm_regmap_init_spi(spi, &s->regcfg);
1073 if (IS_ERR(s->regmap)) {
1074 ret = PTR_ERR(s->regmap);
1075 dev_err(dev, "Failed to initialize register map\n");
1076 goto err_out;
1077 }
1078
1079 /* Reset chip & check SPI function */
1080 ret = regmap_write(s->regmap, MAX310X_MODE2_REG, MAX310X_MODE2_RST_BIT);
1081 if (ret) {
1082 dev_err(dev, "SPI transfer failed\n");
1083 goto err_out;
1084 }
1085 /* Clear chip reset */
1086 regmap_write(s->regmap, MAX310X_MODE2_REG, 0);
1087
1088 switch (chiptype) {
1089 case MAX310X_TYPE_MAX3107:
1090 /* Check REV ID to ensure we are talking to what we expect */
1091 regmap_read(s->regmap, MAX3107_REVID_REG, &val);
1092 if (((val & MAX3107_REV_MASK) != MAX3107_REV_ID)) {
1093 dev_err(dev, "%s ID 0x%02x does not match\n",
1094 s->name, val);
1095 ret = -ENODEV;
1096 goto err_out;
1097 }
1098 break;
1099 case MAX310X_TYPE_MAX3108:
1100 /* MAX3108 have not REV ID register, we just check default value
1101 * from clocksource register to make sure everything works.
1102 */
1103 regmap_read(s->regmap, MAX310X_CLKSRC_REG, &val);
1104 if (val != (MAX310X_CLKSRC_EXTCLK_BIT |
1105 MAX310X_CLKSRC_PLLBYP_BIT)) {
1106 dev_err(dev, "%s not present\n", s->name);
1107 ret = -ENODEV;
1108 goto err_out;
1109 }
1110 break;
1111 }
1112
1113 /* Board specific configure */
1114 if (pdata->init)
1115 pdata->init();
1116 if (pdata->suspend)
1117 pdata->suspend(0);
1118
1119 /* Calculate referecne clock */
1120 s->uartclk = max310x_set_ref_clk(s);
1121
1122 /* Disable all interrupts */
1123 regmap_write(s->regmap, MAX310X_IRQEN_REG, 0);
1124
1125 /* Setup MODE1 register */
1126 val = MAX310X_MODE1_IRQSEL_BIT; /* Enable IRQ pin */
1127 if (pdata->driver_flags & MAX310X_AUTOSLEEP)
1128 val = MAX310X_MODE1_AUTOSLEEP_BIT;
1129 regmap_write(s->regmap, MAX310X_MODE1_REG, val);
1130
1131 /* Setup interrupt */
1132 ret = devm_request_threaded_irq(dev, spi->irq, NULL, max310x_ist,
1133 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1134 dev_name(dev), s);
1135 if (ret) {
1136 dev_err(dev, "Unable to reguest IRQ %i\n", spi->irq);
1137 goto err_out;
1138 }
1139
1140 /* Register UART driver */
1141 s->uart.owner = THIS_MODULE;
1142 s->uart.driver_name = dev_name(dev);
1143 s->uart.dev_name = "ttyMAX";
1144 s->uart.major = MAX310X_MAJOR;
1145 s->uart.minor = MAX310X_MINOR;
1146 ret = uart_register_driver(&s->uart);
1147 if (ret) {
1148 dev_err(dev, "Registering UART driver failed\n");
1149 goto err_out;
1150 }
1151
1152 /* Initialize workqueue for start TX */
1153 s->wq = create_freezable_workqueue(dev_name(dev));
1154 INIT_WORK(&s->tx_work, max310x_wq_proc);
1155
1156 /* Initialize UART port data */
1157 s->port.line = 0;
1158 s->port.dev = dev;
1159 s->port.irq = spi->irq;
1160 s->port.type = PORT_MAX310X;
1161 s->port.fifosize = MAX310X_FIFO_SIZE;
1162 s->port.flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
1163 s->port.iotype = UPIO_PORT;
1164 s->port.membase = (void __iomem *)0xffffffff; /* Bogus value */
1165 s->port.uartclk = s->uartclk;
1166 s->port.ops = &max310x_ops;
1167 uart_add_one_port(&s->uart, &s->port);
1168
1169#ifdef CONFIG_GPIOLIB
1170 /* Setup GPIO cotroller */
1171 if (pdata->gpio_base) {
1172 s->gpio.owner = THIS_MODULE;
1173 s->gpio.dev = dev;
1174 s->gpio.label = dev_name(dev);
1175 s->gpio.direction_input = max310x_gpio_direction_input;
1176 s->gpio.get = max310x_gpio_get;
1177 s->gpio.direction_output= max310x_gpio_direction_output;
1178 s->gpio.set = max310x_gpio_set;
1179 s->gpio.base = pdata->gpio_base;
1180 s->gpio.ngpio = s->nr_gpio;
1181 if (gpiochip_add(&s->gpio)) {
1182 /* Indicate that we should not call gpiochip_remove */
1183 s->gpio.base = 0;
1184 }
1185 } else
1186 dev_info(dev, "GPIO support not enabled\n");
1187#endif
1188
1189 /* Go to suspend mode */
1190 if (pdata->suspend)
1191 pdata->suspend(1);
1192
1193 return 0;
1194
1195err_freq:
1196 dev_err(dev, "Frequency parameter incorrect\n");
1197 ret = -EINVAL;
1198
1199err_out:
1200 dev_set_drvdata(dev, NULL);
1201 devm_kfree(dev, s);
1202
1203 return ret;
1204}
1205
1206static int __devexit max310x_remove(struct spi_device *spi)
1207{
1208 struct device *dev = &spi->dev;
1209 struct max310x_port *s = dev_get_drvdata(dev);
1210
1211 dev_dbg(dev, "Removing port\n");
1212
1213 devm_free_irq(dev, s->port.irq, s);
1214
1215 destroy_workqueue(s->wq);
1216
1217 uart_remove_one_port(&s->uart, &s->port);
1218
1219 uart_unregister_driver(&s->uart);
1220
1221#ifdef CONFIG_GPIOLIB
1222 if (s->pdata->gpio_base)
1223 gpiochip_remove(&s->gpio);
1224#endif
1225
1226 dev_set_drvdata(dev, NULL);
1227
1228 if (s->pdata->suspend)
1229 s->pdata->suspend(1);
1230 if (s->pdata->exit)
1231 s->pdata->exit();
1232
1233 devm_kfree(dev, s);
1234
1235 return 0;
1236}
1237
1238static const struct spi_device_id max310x_id_table[] = {
1239 { "max3107", MAX310X_TYPE_MAX3107 },
1240 { "max3108", MAX310X_TYPE_MAX3108 },
1241};
1242MODULE_DEVICE_TABLE(spi, max310x_id_table);
1243
1244static struct spi_driver max310x_driver = {
1245 .driver = {
1246 .name = "max310x",
1247 .owner = THIS_MODULE,
1248 },
1249 .probe = max310x_probe,
1250 .remove = __devexit_p(max310x_remove),
1251 .suspend = max310x_suspend,
1252 .resume = max310x_resume,
1253 .id_table = max310x_id_table,
1254};
1255module_spi_driver(max310x_driver);
1256
1257MODULE_LICENSE("GPL v2");
1258MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
1259MODULE_DESCRIPTION("MAX310X serial driver");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 23:46:23 -0500