]>
Commit | Line | Data |
---|---|---|
1dbae815 | 1 | /* |
f30c2269 | 2 | * arch/arm/mach-omap2/serial.c |
1dbae815 TL |
3 | * |
4 | * OMAP2 serial support. | |
5 | * | |
6e81176d | 6 | * Copyright (C) 2005-2008 Nokia Corporation |
1dbae815 TL |
7 | * Author: Paul Mundt <paul.mundt@nokia.com> |
8 | * | |
4af4016c KH |
9 | * Major rework for PM support by Kevin Hilman |
10 | * | |
1dbae815 TL |
11 | * Based off of arch/arm/mach-omap/omap1/serial.c |
12 | * | |
44169075 SS |
13 | * Copyright (C) 2009 Texas Instruments |
14 | * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com | |
15 | * | |
1dbae815 TL |
16 | * This file is subject to the terms and conditions of the GNU General Public |
17 | * License. See the file "COPYING" in the main directory of this archive | |
18 | * for more details. | |
19 | */ | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
f8ce2547 | 22 | #include <linux/clk.h> |
fced80c7 | 23 | #include <linux/io.h> |
e03d37d8 | 24 | #include <linux/delay.h> |
6f251e9d KH |
25 | #include <linux/platform_device.h> |
26 | #include <linux/slab.h> | |
3244fcd2 | 27 | #include <linux/pm_runtime.h> |
0d8e2d0d | 28 | #include <linux/console.h> |
6f251e9d | 29 | |
6f251e9d | 30 | #include <plat/omap-serial.h> |
4e65331c | 31 | #include "common.h" |
ce491cf8 | 32 | #include <plat/board.h> |
6f251e9d KH |
33 | #include <plat/dma.h> |
34 | #include <plat/omap_hwmod.h> | |
35 | #include <plat/omap_device.h> | |
ec3bebc6 | 36 | #include <plat/omap-pm.h> |
4af4016c | 37 | |
59fb659b | 38 | #include "prm2xxx_3xxx.h" |
4af4016c | 39 | #include "pm.h" |
59fb659b | 40 | #include "cm2xxx_3xxx.h" |
4af4016c | 41 | #include "prm-regbits-34xx.h" |
4814ced5 | 42 | #include "control.h" |
40e44399 | 43 | #include "mux.h" |
4af4016c | 44 | |
301fe8ee | 45 | /* |
c86845db D |
46 | * NOTE: By default the serial auto_suspend timeout is disabled as it causes |
47 | * lost characters over the serial ports. This means that the UART clocks will | |
48 | * stay on until power/autosuspend_delay is set for the uart from sysfs. | |
49 | * This also causes that any deeper omap sleep states are blocked. | |
301fe8ee | 50 | */ |
c86845db | 51 | #define DEFAULT_AUTOSUSPEND_DELAY -1 |
4af4016c | 52 | |
6f251e9d KH |
53 | #define MAX_UART_HWMOD_NAME_LEN 16 |
54 | ||
4af4016c KH |
55 | struct omap_uart_state { |
56 | int num; | |
4af4016c | 57 | |
4af4016c | 58 | struct list_head node; |
6f251e9d | 59 | struct omap_hwmod *oh; |
4af4016c KH |
60 | }; |
61 | ||
4af4016c | 62 | static LIST_HEAD(uart_list); |
6f251e9d | 63 | static u8 num_uarts; |
8612bd22 | 64 | static u8 console_uart_id = -1; |
08f86b3e | 65 | static u8 no_console_suspend; |
36fc2d15 | 66 | static u8 uart_debug; |
1dbae815 | 67 | |
a9e210e0 | 68 | #define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */ |
c86845db | 69 | #define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */ |
a9e210e0 | 70 | #define DEFAULT_RXDMA_TIMEOUT (3 * HZ)/* RX DMA timeout (jiffies) */ |
c86845db D |
71 | |
72 | static struct omap_uart_port_info omap_serial_default_info[] __initdata = { | |
73 | { | |
74 | .dma_enabled = false, | |
75 | .dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE, | |
a9e210e0 | 76 | .dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE, |
c86845db D |
77 | .dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT, |
78 | .autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY, | |
79 | }, | |
80 | }; | |
81 | ||
4af4016c | 82 | #ifdef CONFIG_PM |
62f3ec5f | 83 | static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable) |
4af4016c | 84 | { |
62f3ec5f | 85 | struct omap_device *od = to_omap_device(pdev); |
4af4016c | 86 | |
62f3ec5f G |
87 | if (!od) |
88 | return; | |
4af4016c | 89 | |
62f3ec5f G |
90 | if (enable) |
91 | omap_hwmod_enable_wakeup(od->hwmods[0]); | |
92 | else | |
93 | omap_hwmod_disable_wakeup(od->hwmods[0]); | |
ba87a9be JH |
94 | } |
95 | ||
94734749 G |
96 | /* |
97 | * Errata i291: [UART]:Cannot Acknowledge Idle Requests | |
98 | * in Smartidle Mode When Configured for DMA Operations. | |
99 | * WA: configure uart in force idle mode. | |
100 | */ | |
101 | static void omap_uart_set_noidle(struct platform_device *pdev) | |
102 | { | |
103 | struct omap_device *od = to_omap_device(pdev); | |
104 | ||
105 | omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_NO); | |
106 | } | |
107 | ||
be4b0281 | 108 | static void omap_uart_set_smartidle(struct platform_device *pdev) |
94734749 G |
109 | { |
110 | struct omap_device *od = to_omap_device(pdev); | |
111 | ||
be4b0281 | 112 | omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_SMART); |
94734749 G |
113 | } |
114 | ||
4af4016c | 115 | #else |
62f3ec5f G |
116 | static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable) |
117 | {} | |
94734749 | 118 | static void omap_uart_set_noidle(struct platform_device *pdev) {} |
be4b0281 | 119 | static void omap_uart_set_smartidle(struct platform_device *pdev) {} |
4af4016c KH |
120 | #endif /* CONFIG_PM */ |
121 | ||
7496ba30 G |
122 | #ifdef CONFIG_OMAP_MUX |
123 | static struct omap_device_pad default_uart1_pads[] __initdata = { | |
124 | { | |
125 | .name = "uart1_cts.uart1_cts", | |
126 | .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0, | |
127 | }, | |
128 | { | |
129 | .name = "uart1_rts.uart1_rts", | |
130 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
131 | }, | |
132 | { | |
133 | .name = "uart1_tx.uart1_tx", | |
134 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
135 | }, | |
136 | { | |
137 | .name = "uart1_rx.uart1_rx", | |
138 | .flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP, | |
139 | .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0, | |
140 | .idle = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0, | |
141 | }, | |
142 | }; | |
143 | ||
144 | static struct omap_device_pad default_uart2_pads[] __initdata = { | |
145 | { | |
146 | .name = "uart2_cts.uart2_cts", | |
147 | .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0, | |
148 | }, | |
149 | { | |
150 | .name = "uart2_rts.uart2_rts", | |
151 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
152 | }, | |
153 | { | |
154 | .name = "uart2_tx.uart2_tx", | |
155 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
156 | }, | |
157 | { | |
158 | .name = "uart2_rx.uart2_rx", | |
159 | .flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP, | |
160 | .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0, | |
161 | .idle = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0, | |
162 | }, | |
163 | }; | |
164 | ||
165 | static struct omap_device_pad default_uart3_pads[] __initdata = { | |
166 | { | |
167 | .name = "uart3_cts_rctx.uart3_cts_rctx", | |
168 | .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0, | |
169 | }, | |
170 | { | |
171 | .name = "uart3_rts_sd.uart3_rts_sd", | |
172 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
173 | }, | |
174 | { | |
175 | .name = "uart3_tx_irtx.uart3_tx_irtx", | |
176 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
177 | }, | |
178 | { | |
179 | .name = "uart3_rx_irrx.uart3_rx_irrx", | |
180 | .flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP, | |
181 | .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0, | |
182 | .idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0, | |
183 | }, | |
184 | }; | |
185 | ||
186 | static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = { | |
187 | { | |
188 | .name = "gpmc_wait2.uart4_tx", | |
189 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
190 | }, | |
191 | { | |
192 | .name = "gpmc_wait3.uart4_rx", | |
193 | .flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP, | |
194 | .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE2, | |
195 | .idle = OMAP_PIN_INPUT | OMAP_MUX_MODE2, | |
196 | }, | |
197 | }; | |
198 | ||
199 | static struct omap_device_pad default_omap4_uart4_pads[] __initdata = { | |
200 | { | |
201 | .name = "uart4_tx.uart4_tx", | |
202 | .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0, | |
203 | }, | |
204 | { | |
205 | .name = "uart4_rx.uart4_rx", | |
206 | .flags = OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP, | |
207 | .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0, | |
208 | .idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0, | |
209 | }, | |
210 | }; | |
211 | ||
212 | static void omap_serial_fill_default_pads(struct omap_board_data *bdata) | |
213 | { | |
214 | switch (bdata->id) { | |
215 | case 0: | |
216 | bdata->pads = default_uart1_pads; | |
217 | bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads); | |
218 | break; | |
219 | case 1: | |
220 | bdata->pads = default_uart2_pads; | |
221 | bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads); | |
222 | break; | |
223 | case 2: | |
224 | bdata->pads = default_uart3_pads; | |
225 | bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads); | |
226 | break; | |
227 | case 3: | |
228 | if (cpu_is_omap44xx()) { | |
229 | bdata->pads = default_omap4_uart4_pads; | |
230 | bdata->pads_cnt = | |
231 | ARRAY_SIZE(default_omap4_uart4_pads); | |
232 | } else if (cpu_is_omap3630()) { | |
233 | bdata->pads = default_omap36xx_uart4_pads; | |
234 | bdata->pads_cnt = | |
235 | ARRAY_SIZE(default_omap36xx_uart4_pads); | |
236 | } | |
237 | break; | |
238 | default: | |
239 | break; | |
240 | } | |
241 | } | |
242 | #else | |
243 | static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {} | |
244 | #endif | |
245 | ||
8612bd22 G |
246 | char *cmdline_find_option(char *str) |
247 | { | |
248 | extern char *saved_command_line; | |
249 | ||
250 | return strstr(saved_command_line, str); | |
251 | } | |
252 | ||
3e16f925 | 253 | static int __init omap_serial_early_init(void) |
1dbae815 | 254 | { |
6f251e9d KH |
255 | do { |
256 | char oh_name[MAX_UART_HWMOD_NAME_LEN]; | |
257 | struct omap_hwmod *oh; | |
258 | struct omap_uart_state *uart; | |
8612bd22 | 259 | char uart_name[MAX_UART_HWMOD_NAME_LEN]; |
21b90340 | 260 | |
6f251e9d | 261 | snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN, |
969996a5 | 262 | "uart%d", num_uarts + 1); |
6f251e9d KH |
263 | oh = omap_hwmod_lookup(oh_name); |
264 | if (!oh) | |
265 | break; | |
266 | ||
267 | uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL); | |
268 | if (WARN_ON(!uart)) | |
3e16f925 | 269 | return -ENODEV; |
1dbae815 | 270 | |
6f251e9d | 271 | uart->oh = oh; |
969996a5 | 272 | uart->num = num_uarts++; |
6f251e9d | 273 | list_add_tail(&uart->node, &uart_list); |
8612bd22 G |
274 | snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN, |
275 | "%s%d", OMAP_SERIAL_NAME, uart->num); | |
276 | ||
277 | if (cmdline_find_option(uart_name)) { | |
278 | console_uart_id = uart->num; | |
08f86b3e | 279 | |
36fc2d15 G |
280 | if (console_loglevel >= 10) { |
281 | uart_debug = true; | |
282 | pr_info("%s used as console in debug mode" | |
283 | " uart%d clocks will not be" | |
284 | " gated", uart_name, uart->num); | |
285 | } | |
286 | ||
08f86b3e G |
287 | if (cmdline_find_option("no_console_suspend")) |
288 | no_console_suspend = true; | |
289 | ||
8612bd22 G |
290 | /* |
291 | * omap-uart can be used for earlyprintk logs | |
292 | * So if omap-uart is used as console then prevent | |
293 | * uart reset and idle to get logs from omap-uart | |
294 | * until uart console driver is available to take | |
295 | * care for console messages. | |
296 | * Idling or resetting omap-uart while printing logs | |
297 | * early boot logs can stall the boot-up. | |
298 | */ | |
299 | oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET; | |
300 | } | |
6f251e9d | 301 | } while (1); |
3e16f925 TL |
302 | |
303 | return 0; | |
b3c6df3a | 304 | } |
3e16f925 | 305 | core_initcall(omap_serial_early_init); |
b3c6df3a | 306 | |
f62349ee MW |
307 | /** |
308 | * omap_serial_init_port() - initialize single serial port | |
40e44399 | 309 | * @bdata: port specific board data pointer |
c86845db | 310 | * @info: platform specific data pointer |
f62349ee | 311 | * |
40e44399 | 312 | * This function initialies serial driver for given port only. |
f62349ee MW |
313 | * Platforms can call this function instead of omap_serial_init() |
314 | * if they don't plan to use all available UARTs as serial ports. | |
315 | * | |
316 | * Don't mix calls to omap_serial_init_port() and omap_serial_init(), | |
317 | * use only one of the two. | |
318 | */ | |
c86845db D |
319 | void __init omap_serial_init_port(struct omap_board_data *bdata, |
320 | struct omap_uart_port_info *info) | |
b3c6df3a | 321 | { |
f62349ee | 322 | struct omap_uart_state *uart; |
6f251e9d | 323 | struct omap_hwmod *oh; |
3528c58e | 324 | struct platform_device *pdev; |
6f251e9d KH |
325 | void *pdata = NULL; |
326 | u32 pdata_size = 0; | |
327 | char *name; | |
6f251e9d | 328 | struct omap_uart_port_info omap_up; |
970a724d | 329 | |
40e44399 | 330 | if (WARN_ON(!bdata)) |
6f251e9d | 331 | return; |
40e44399 TL |
332 | if (WARN_ON(bdata->id < 0)) |
333 | return; | |
334 | if (WARN_ON(bdata->id >= num_uarts)) | |
e88d556d | 335 | return; |
f62349ee | 336 | |
6f251e9d | 337 | list_for_each_entry(uart, &uart_list, node) |
40e44399 | 338 | if (bdata->id == uart->num) |
6f251e9d | 339 | break; |
c86845db D |
340 | if (!info) |
341 | info = omap_serial_default_info; | |
f2eeeae0 | 342 | |
6f251e9d | 343 | oh = uart->oh; |
6f251e9d KH |
344 | name = DRIVER_NAME; |
345 | ||
c86845db | 346 | omap_up.dma_enabled = info->dma_enabled; |
6f251e9d | 347 | omap_up.uartclk = OMAP24XX_BASE_BAUD * 16; |
273558b3 | 348 | omap_up.flags = UPF_BOOT_AUTOCONF; |
ec3bebc6 | 349 | omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count; |
be4b0281 | 350 | omap_up.set_forceidle = omap_uart_set_smartidle; |
94734749 | 351 | omap_up.set_noidle = omap_uart_set_noidle; |
62f3ec5f | 352 | omap_up.enable_wakeup = omap_uart_enable_wakeup; |
c86845db D |
353 | omap_up.dma_rx_buf_size = info->dma_rx_buf_size; |
354 | omap_up.dma_rx_timeout = info->dma_rx_timeout; | |
a9e210e0 | 355 | omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate; |
c86845db | 356 | omap_up.autosuspend_timeout = info->autosuspend_timeout; |
94734749 G |
357 | |
358 | /* Enable the MDR1 Errata i202 for OMAP2430/3xxx/44xx */ | |
359 | if (!cpu_is_omap2420() && !cpu_is_ti816x()) | |
360 | omap_up.errata |= UART_ERRATA_i202_MDR1_ACCESS; | |
361 | ||
362 | /* Enable DMA Mode Force Idle Errata i291 for omap34xx/3630 */ | |
363 | if (cpu_is_omap34xx() || cpu_is_omap3630()) | |
364 | omap_up.errata |= UART_ERRATA_i291_DMA_FORCEIDLE; | |
6f251e9d KH |
365 | |
366 | pdata = &omap_up; | |
367 | pdata_size = sizeof(struct omap_uart_port_info); | |
6f251e9d KH |
368 | |
369 | if (WARN_ON(!oh)) | |
370 | return; | |
371 | ||
3528c58e | 372 | pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size, |
f718e2c0 | 373 | NULL, 0, false); |
3528c58e | 374 | WARN(IS_ERR(pdev), "Could not build omap_device for %s: %s.\n", |
6f251e9d KH |
375 | name, oh->name); |
376 | ||
08f86b3e G |
377 | if ((console_uart_id == bdata->id) && no_console_suspend) |
378 | omap_device_disable_idle_on_suspend(pdev); | |
379 | ||
40e44399 TL |
380 | oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt); |
381 | ||
6f251e9d KH |
382 | oh->dev_attr = uart; |
383 | ||
36fc2d15 G |
384 | if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads) |
385 | && !uart_debug) | |
3528c58e | 386 | device_init_wakeup(&pdev->dev, true); |
f62349ee MW |
387 | } |
388 | ||
389 | /** | |
c86845db D |
390 | * omap_serial_board_init() - initialize all supported serial ports |
391 | * @info: platform specific data pointer | |
f62349ee MW |
392 | * |
393 | * Initializes all available UARTs as serial ports. Platforms | |
394 | * can call this function when they want to have default behaviour | |
395 | * for serial ports (e.g initialize them all as serial ports). | |
396 | */ | |
c86845db | 397 | void __init omap_serial_board_init(struct omap_uart_port_info *info) |
f62349ee | 398 | { |
6f251e9d | 399 | struct omap_uart_state *uart; |
40e44399 | 400 | struct omap_board_data bdata; |
f62349ee | 401 | |
40e44399 TL |
402 | list_for_each_entry(uart, &uart_list, node) { |
403 | bdata.id = uart->num; | |
404 | bdata.flags = 0; | |
405 | bdata.pads = NULL; | |
406 | bdata.pads_cnt = 0; | |
7496ba30 G |
407 | |
408 | if (cpu_is_omap44xx() || cpu_is_omap34xx()) | |
409 | omap_serial_fill_default_pads(&bdata); | |
410 | ||
c86845db D |
411 | if (!info) |
412 | omap_serial_init_port(&bdata, NULL); | |
413 | else | |
414 | omap_serial_init_port(&bdata, &info[uart->num]); | |
40e44399 | 415 | } |
1dbae815 | 416 | } |
c86845db D |
417 | |
418 | /** | |
419 | * omap_serial_init() - initialize all supported serial ports | |
420 | * | |
421 | * Initializes all available UARTs. | |
422 | * Platforms can call this function when they want to have default behaviour | |
423 | * for serial ports (e.g initialize them all as serial ports). | |
424 | */ | |
425 | void __init omap_serial_init(void) | |
426 | { | |
427 | omap_serial_board_init(NULL); | |
428 | } |