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" |
6f251e9d KH |
32 | #include <plat/dma.h> |
33 | #include <plat/omap_hwmod.h> | |
34 | #include <plat/omap_device.h> | |
ec3bebc6 | 35 | #include <plat/omap-pm.h> |
7d7e1eba | 36 | #include <plat/serial.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; |
91930652 | 60 | struct omap_device_pad default_omap_uart_pads[2]; |
4af4016c KH |
61 | }; |
62 | ||
4af4016c | 63 | static LIST_HEAD(uart_list); |
6f251e9d | 64 | static u8 num_uarts; |
8612bd22 | 65 | static u8 console_uart_id = -1; |
08f86b3e | 66 | static u8 no_console_suspend; |
36fc2d15 | 67 | static u8 uart_debug; |
1dbae815 | 68 | |
a9e210e0 | 69 | #define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */ |
c86845db | 70 | #define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */ |
a9e210e0 | 71 | #define DEFAULT_RXDMA_TIMEOUT (3 * HZ)/* RX DMA timeout (jiffies) */ |
c86845db D |
72 | |
73 | static struct omap_uart_port_info omap_serial_default_info[] __initdata = { | |
74 | { | |
75 | .dma_enabled = false, | |
76 | .dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE, | |
a9e210e0 | 77 | .dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE, |
c86845db D |
78 | .dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT, |
79 | .autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY, | |
80 | }, | |
81 | }; | |
82 | ||
4af4016c | 83 | #ifdef CONFIG_PM |
d8ee4ea6 | 84 | static void omap_uart_enable_wakeup(struct device *dev, bool enable) |
4af4016c | 85 | { |
d8ee4ea6 | 86 | struct platform_device *pdev = to_platform_device(dev); |
62f3ec5f | 87 | struct omap_device *od = to_omap_device(pdev); |
4af4016c | 88 | |
62f3ec5f G |
89 | if (!od) |
90 | return; | |
4af4016c | 91 | |
62f3ec5f G |
92 | if (enable) |
93 | omap_hwmod_enable_wakeup(od->hwmods[0]); | |
94 | else | |
95 | omap_hwmod_disable_wakeup(od->hwmods[0]); | |
ba87a9be JH |
96 | } |
97 | ||
94734749 G |
98 | /* |
99 | * Errata i291: [UART]:Cannot Acknowledge Idle Requests | |
100 | * in Smartidle Mode When Configured for DMA Operations. | |
101 | * WA: configure uart in force idle mode. | |
102 | */ | |
d8ee4ea6 | 103 | static void omap_uart_set_noidle(struct device *dev) |
94734749 | 104 | { |
d8ee4ea6 | 105 | struct platform_device *pdev = to_platform_device(dev); |
94734749 G |
106 | struct omap_device *od = to_omap_device(pdev); |
107 | ||
108 | omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_NO); | |
109 | } | |
110 | ||
d8ee4ea6 | 111 | static void omap_uart_set_smartidle(struct device *dev) |
94734749 | 112 | { |
d8ee4ea6 | 113 | struct platform_device *pdev = to_platform_device(dev); |
94734749 | 114 | struct omap_device *od = to_omap_device(pdev); |
5ae256dc | 115 | u8 idlemode; |
94734749 | 116 | |
5ae256dc SS |
117 | if (od->hwmods[0]->class->sysc->idlemodes & SIDLE_SMART_WKUP) |
118 | idlemode = HWMOD_IDLEMODE_SMART_WKUP; | |
119 | else | |
120 | idlemode = HWMOD_IDLEMODE_SMART; | |
121 | ||
122 | omap_hwmod_set_slave_idlemode(od->hwmods[0], idlemode); | |
94734749 G |
123 | } |
124 | ||
4af4016c | 125 | #else |
d8ee4ea6 | 126 | static void omap_uart_enable_wakeup(struct device *dev, bool enable) |
62f3ec5f | 127 | {} |
d8ee4ea6 FB |
128 | static void omap_uart_set_noidle(struct device *dev) {} |
129 | static void omap_uart_set_smartidle(struct device *dev) {} | |
4af4016c KH |
130 | #endif /* CONFIG_PM */ |
131 | ||
7496ba30 | 132 | #ifdef CONFIG_OMAP_MUX |
91930652 G |
133 | |
134 | #define OMAP_UART_DEFAULT_PAD_NAME_LEN 28 | |
135 | static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN], | |
136 | tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata; | |
137 | ||
138 | static void __init | |
139 | omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata, | |
140 | struct omap_uart_state *uart) | |
141 | { | |
142 | uart->default_omap_uart_pads[0].name = rx_pad_name; | |
143 | uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX | | |
144 | OMAP_DEVICE_PAD_WAKEUP; | |
145 | uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT | | |
146 | OMAP_MUX_MODE0; | |
147 | uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0; | |
148 | uart->default_omap_uart_pads[1].name = tx_pad_name; | |
149 | uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT | | |
150 | OMAP_MUX_MODE0; | |
151 | bdata->pads = uart->default_omap_uart_pads; | |
152 | bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads); | |
153 | } | |
154 | ||
155 | static void __init omap_serial_check_wakeup(struct omap_board_data *bdata, | |
156 | struct omap_uart_state *uart) | |
7496ba30 | 157 | { |
91930652 G |
158 | struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL; |
159 | struct omap_mux *rx_mux = NULL, *tx_mux = NULL; | |
160 | char *rx_fmt, *tx_fmt; | |
161 | int uart_nr = bdata->id + 1; | |
162 | ||
163 | if (bdata->id != 2) { | |
164 | rx_fmt = "uart%d_rx.uart%d_rx"; | |
165 | tx_fmt = "uart%d_tx.uart%d_tx"; | |
166 | } else { | |
167 | rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx"; | |
168 | tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx"; | |
169 | } | |
170 | ||
171 | snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt, | |
172 | uart_nr, uart_nr); | |
173 | snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt, | |
174 | uart_nr, uart_nr); | |
175 | ||
176 | if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 && | |
177 | omap_mux_get_by_name | |
178 | (tx_pad_name, &tx_partition, &tx_mux) >= 0) { | |
179 | u16 tx_mode, rx_mode; | |
180 | ||
181 | tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset); | |
182 | rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset); | |
183 | ||
184 | /* | |
185 | * Check if uart is used in default tx/rx mode i.e. in mux mode0 | |
186 | * if yes then configure rx pin for wake up capability | |
187 | */ | |
188 | if (OMAP_MODE_UART(rx_mode) && OMAP_MODE_UART(tx_mode)) | |
189 | omap_serial_fill_uart_tx_rx_pads(bdata, uart); | |
190 | } | |
7496ba30 G |
191 | } |
192 | #else | |
91930652 G |
193 | static void __init omap_serial_check_wakeup(struct omap_board_data *bdata, |
194 | struct omap_uart_state *uart) | |
195 | { | |
196 | } | |
7496ba30 G |
197 | #endif |
198 | ||
8c3d4534 | 199 | static char *cmdline_find_option(char *str) |
8612bd22 G |
200 | { |
201 | extern char *saved_command_line; | |
202 | ||
203 | return strstr(saved_command_line, str); | |
204 | } | |
205 | ||
3e16f925 | 206 | static int __init omap_serial_early_init(void) |
1dbae815 | 207 | { |
6f251e9d KH |
208 | do { |
209 | char oh_name[MAX_UART_HWMOD_NAME_LEN]; | |
210 | struct omap_hwmod *oh; | |
211 | struct omap_uart_state *uart; | |
8612bd22 | 212 | char uart_name[MAX_UART_HWMOD_NAME_LEN]; |
21b90340 | 213 | |
6f251e9d | 214 | snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN, |
969996a5 | 215 | "uart%d", num_uarts + 1); |
6f251e9d KH |
216 | oh = omap_hwmod_lookup(oh_name); |
217 | if (!oh) | |
218 | break; | |
219 | ||
220 | uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL); | |
221 | if (WARN_ON(!uart)) | |
3e16f925 | 222 | return -ENODEV; |
1dbae815 | 223 | |
6f251e9d | 224 | uart->oh = oh; |
969996a5 | 225 | uart->num = num_uarts++; |
6f251e9d | 226 | list_add_tail(&uart->node, &uart_list); |
8612bd22 G |
227 | snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN, |
228 | "%s%d", OMAP_SERIAL_NAME, uart->num); | |
229 | ||
230 | if (cmdline_find_option(uart_name)) { | |
231 | console_uart_id = uart->num; | |
08f86b3e | 232 | |
36fc2d15 G |
233 | if (console_loglevel >= 10) { |
234 | uart_debug = true; | |
7852ec05 PW |
235 | pr_info("%s used as console in debug mode: uart%d clocks will not be gated", |
236 | uart_name, uart->num); | |
36fc2d15 G |
237 | } |
238 | ||
08f86b3e G |
239 | if (cmdline_find_option("no_console_suspend")) |
240 | no_console_suspend = true; | |
241 | ||
8612bd22 G |
242 | /* |
243 | * omap-uart can be used for earlyprintk logs | |
244 | * So if omap-uart is used as console then prevent | |
245 | * uart reset and idle to get logs from omap-uart | |
246 | * until uart console driver is available to take | |
247 | * care for console messages. | |
248 | * Idling or resetting omap-uart while printing logs | |
249 | * early boot logs can stall the boot-up. | |
250 | */ | |
251 | oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET; | |
252 | } | |
6f251e9d | 253 | } while (1); |
3e16f925 TL |
254 | |
255 | return 0; | |
b3c6df3a | 256 | } |
3e16f925 | 257 | core_initcall(omap_serial_early_init); |
b3c6df3a | 258 | |
f62349ee MW |
259 | /** |
260 | * omap_serial_init_port() - initialize single serial port | |
40e44399 | 261 | * @bdata: port specific board data pointer |
c86845db | 262 | * @info: platform specific data pointer |
f62349ee | 263 | * |
40e44399 | 264 | * This function initialies serial driver for given port only. |
f62349ee MW |
265 | * Platforms can call this function instead of omap_serial_init() |
266 | * if they don't plan to use all available UARTs as serial ports. | |
267 | * | |
268 | * Don't mix calls to omap_serial_init_port() and omap_serial_init(), | |
269 | * use only one of the two. | |
270 | */ | |
c86845db D |
271 | void __init omap_serial_init_port(struct omap_board_data *bdata, |
272 | struct omap_uart_port_info *info) | |
b3c6df3a | 273 | { |
f62349ee | 274 | struct omap_uart_state *uart; |
6f251e9d | 275 | struct omap_hwmod *oh; |
3528c58e | 276 | struct platform_device *pdev; |
6f251e9d KH |
277 | void *pdata = NULL; |
278 | u32 pdata_size = 0; | |
279 | char *name; | |
6f251e9d | 280 | struct omap_uart_port_info omap_up; |
970a724d | 281 | |
40e44399 | 282 | if (WARN_ON(!bdata)) |
6f251e9d | 283 | return; |
40e44399 TL |
284 | if (WARN_ON(bdata->id < 0)) |
285 | return; | |
286 | if (WARN_ON(bdata->id >= num_uarts)) | |
e88d556d | 287 | return; |
f62349ee | 288 | |
6f251e9d | 289 | list_for_each_entry(uart, &uart_list, node) |
40e44399 | 290 | if (bdata->id == uart->num) |
6f251e9d | 291 | break; |
c86845db D |
292 | if (!info) |
293 | info = omap_serial_default_info; | |
f2eeeae0 | 294 | |
6f251e9d | 295 | oh = uart->oh; |
6f251e9d KH |
296 | name = DRIVER_NAME; |
297 | ||
c86845db | 298 | omap_up.dma_enabled = info->dma_enabled; |
6f251e9d | 299 | omap_up.uartclk = OMAP24XX_BASE_BAUD * 16; |
273558b3 | 300 | omap_up.flags = UPF_BOOT_AUTOCONF; |
ec3bebc6 | 301 | omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count; |
be4b0281 | 302 | omap_up.set_forceidle = omap_uart_set_smartidle; |
94734749 | 303 | omap_up.set_noidle = omap_uart_set_noidle; |
62f3ec5f | 304 | omap_up.enable_wakeup = omap_uart_enable_wakeup; |
c86845db D |
305 | omap_up.dma_rx_buf_size = info->dma_rx_buf_size; |
306 | omap_up.dma_rx_timeout = info->dma_rx_timeout; | |
a9e210e0 | 307 | omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate; |
c86845db | 308 | omap_up.autosuspend_timeout = info->autosuspend_timeout; |
9574f36f N |
309 | omap_up.DTR_gpio = info->DTR_gpio; |
310 | omap_up.DTR_inverted = info->DTR_inverted; | |
311 | omap_up.DTR_present = info->DTR_present; | |
94734749 | 312 | |
6f251e9d KH |
313 | pdata = &omap_up; |
314 | pdata_size = sizeof(struct omap_uart_port_info); | |
6f251e9d KH |
315 | |
316 | if (WARN_ON(!oh)) | |
317 | return; | |
318 | ||
3528c58e | 319 | pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size, |
f718e2c0 | 320 | NULL, 0, false); |
a032d33b PW |
321 | if (IS_ERR(pdev)) { |
322 | WARN(1, "Could not build omap_device for %s: %s.\n", name, | |
323 | oh->name); | |
324 | return; | |
325 | } | |
6f251e9d | 326 | |
08f86b3e G |
327 | if ((console_uart_id == bdata->id) && no_console_suspend) |
328 | omap_device_disable_idle_on_suspend(pdev); | |
329 | ||
40e44399 TL |
330 | oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt); |
331 | ||
44b1d42a KH |
332 | if (console_uart_id == bdata->id) { |
333 | omap_device_enable(pdev); | |
334 | pm_runtime_set_active(&pdev->dev); | |
335 | } | |
336 | ||
6f251e9d KH |
337 | oh->dev_attr = uart; |
338 | ||
36fc2d15 G |
339 | if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads) |
340 | && !uart_debug) | |
3528c58e | 341 | device_init_wakeup(&pdev->dev, true); |
f62349ee MW |
342 | } |
343 | ||
344 | /** | |
c86845db D |
345 | * omap_serial_board_init() - initialize all supported serial ports |
346 | * @info: platform specific data pointer | |
f62349ee MW |
347 | * |
348 | * Initializes all available UARTs as serial ports. Platforms | |
349 | * can call this function when they want to have default behaviour | |
350 | * for serial ports (e.g initialize them all as serial ports). | |
351 | */ | |
c86845db | 352 | void __init omap_serial_board_init(struct omap_uart_port_info *info) |
f62349ee | 353 | { |
6f251e9d | 354 | struct omap_uart_state *uart; |
40e44399 | 355 | struct omap_board_data bdata; |
f62349ee | 356 | |
40e44399 TL |
357 | list_for_each_entry(uart, &uart_list, node) { |
358 | bdata.id = uart->num; | |
359 | bdata.flags = 0; | |
360 | bdata.pads = NULL; | |
361 | bdata.pads_cnt = 0; | |
7496ba30 | 362 | |
91930652 | 363 | omap_serial_check_wakeup(&bdata, uart); |
7496ba30 | 364 | |
c86845db D |
365 | if (!info) |
366 | omap_serial_init_port(&bdata, NULL); | |
367 | else | |
368 | omap_serial_init_port(&bdata, &info[uart->num]); | |
40e44399 | 369 | } |
1dbae815 | 370 | } |
c86845db D |
371 | |
372 | /** | |
373 | * omap_serial_init() - initialize all supported serial ports | |
374 | * | |
375 | * Initializes all available UARTs. | |
376 | * Platforms can call this function when they want to have default behaviour | |
377 | * for serial ports (e.g initialize them all as serial ports). | |
378 | */ | |
379 | void __init omap_serial_init(void) | |
380 | { | |
381 | omap_serial_board_init(NULL); | |
382 | } |