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> |
45c3eb7d | 29 | #include <linux/omap-dma.h> |
d9ba5737 | 30 | #include <linux/platform_data/serial-omap.h> |
4af4016c | 31 | |
2a296c8f TL |
32 | #include "common.h" |
33 | #include "omap_hwmod.h" | |
34 | #include "omap_device.h" | |
1d5aef49 | 35 | #include "omap-pm.h" |
e4c060db | 36 | #include "soc.h" |
59fb659b | 37 | #include "prm2xxx_3xxx.h" |
4af4016c | 38 | #include "pm.h" |
59fb659b | 39 | #include "cm2xxx_3xxx.h" |
4af4016c | 40 | #include "prm-regbits-34xx.h" |
4814ced5 | 41 | #include "control.h" |
40e44399 | 42 | #include "mux.h" |
3d82cbbb | 43 | #include "serial.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; |
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 |
d8ee4ea6 | 83 | static void omap_uart_enable_wakeup(struct device *dev, bool enable) |
4af4016c | 84 | { |
d8ee4ea6 | 85 | struct platform_device *pdev = to_platform_device(dev); |
62f3ec5f | 86 | struct omap_device *od = to_omap_device(pdev); |
4af4016c | 87 | |
62f3ec5f G |
88 | if (!od) |
89 | return; | |
4af4016c | 90 | |
62f3ec5f G |
91 | if (enable) |
92 | omap_hwmod_enable_wakeup(od->hwmods[0]); | |
93 | else | |
94 | omap_hwmod_disable_wakeup(od->hwmods[0]); | |
ba87a9be JH |
95 | } |
96 | ||
4af4016c | 97 | #else |
d8ee4ea6 | 98 | static void omap_uart_enable_wakeup(struct device *dev, bool enable) |
62f3ec5f | 99 | {} |
4af4016c KH |
100 | #endif /* CONFIG_PM */ |
101 | ||
7496ba30 | 102 | #ifdef CONFIG_OMAP_MUX |
91930652 G |
103 | |
104 | #define OMAP_UART_DEFAULT_PAD_NAME_LEN 28 | |
105 | static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN], | |
106 | tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata; | |
107 | ||
108 | static void __init | |
109 | omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata, | |
110 | struct omap_uart_state *uart) | |
111 | { | |
112 | uart->default_omap_uart_pads[0].name = rx_pad_name; | |
113 | uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX | | |
114 | OMAP_DEVICE_PAD_WAKEUP; | |
115 | uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT | | |
116 | OMAP_MUX_MODE0; | |
117 | uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0; | |
118 | uart->default_omap_uart_pads[1].name = tx_pad_name; | |
119 | uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT | | |
120 | OMAP_MUX_MODE0; | |
121 | bdata->pads = uart->default_omap_uart_pads; | |
122 | bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads); | |
123 | } | |
124 | ||
125 | static void __init omap_serial_check_wakeup(struct omap_board_data *bdata, | |
126 | struct omap_uart_state *uart) | |
7496ba30 | 127 | { |
91930652 G |
128 | struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL; |
129 | struct omap_mux *rx_mux = NULL, *tx_mux = NULL; | |
130 | char *rx_fmt, *tx_fmt; | |
131 | int uart_nr = bdata->id + 1; | |
132 | ||
133 | if (bdata->id != 2) { | |
134 | rx_fmt = "uart%d_rx.uart%d_rx"; | |
135 | tx_fmt = "uart%d_tx.uart%d_tx"; | |
136 | } else { | |
137 | rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx"; | |
138 | tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx"; | |
139 | } | |
140 | ||
141 | snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt, | |
142 | uart_nr, uart_nr); | |
143 | snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt, | |
144 | uart_nr, uart_nr); | |
145 | ||
146 | if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 && | |
147 | omap_mux_get_by_name | |
148 | (tx_pad_name, &tx_partition, &tx_mux) >= 0) { | |
149 | u16 tx_mode, rx_mode; | |
150 | ||
151 | tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset); | |
152 | rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset); | |
153 | ||
154 | /* | |
155 | * Check if uart is used in default tx/rx mode i.e. in mux mode0 | |
156 | * if yes then configure rx pin for wake up capability | |
157 | */ | |
158 | if (OMAP_MODE_UART(rx_mode) && OMAP_MODE_UART(tx_mode)) | |
159 | omap_serial_fill_uart_tx_rx_pads(bdata, uart); | |
160 | } | |
7496ba30 G |
161 | } |
162 | #else | |
91930652 G |
163 | static void __init omap_serial_check_wakeup(struct omap_board_data *bdata, |
164 | struct omap_uart_state *uart) | |
165 | { | |
166 | } | |
7496ba30 G |
167 | #endif |
168 | ||
8c3d4534 | 169 | static char *cmdline_find_option(char *str) |
8612bd22 G |
170 | { |
171 | extern char *saved_command_line; | |
172 | ||
173 | return strstr(saved_command_line, str); | |
174 | } | |
175 | ||
3e16f925 | 176 | static int __init omap_serial_early_init(void) |
1dbae815 | 177 | { |
82702ea1 TL |
178 | if (of_have_populated_dt()) |
179 | return -ENODEV; | |
180 | ||
6f251e9d KH |
181 | do { |
182 | char oh_name[MAX_UART_HWMOD_NAME_LEN]; | |
183 | struct omap_hwmod *oh; | |
184 | struct omap_uart_state *uart; | |
8612bd22 | 185 | char uart_name[MAX_UART_HWMOD_NAME_LEN]; |
21b90340 | 186 | |
6f251e9d | 187 | snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN, |
969996a5 | 188 | "uart%d", num_uarts + 1); |
6f251e9d KH |
189 | oh = omap_hwmod_lookup(oh_name); |
190 | if (!oh) | |
191 | break; | |
192 | ||
193 | uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL); | |
194 | if (WARN_ON(!uart)) | |
3e16f925 | 195 | return -ENODEV; |
1dbae815 | 196 | |
6f251e9d | 197 | uart->oh = oh; |
969996a5 | 198 | uart->num = num_uarts++; |
6f251e9d | 199 | list_add_tail(&uart->node, &uart_list); |
8612bd22 G |
200 | snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN, |
201 | "%s%d", OMAP_SERIAL_NAME, uart->num); | |
202 | ||
203 | if (cmdline_find_option(uart_name)) { | |
204 | console_uart_id = uart->num; | |
08f86b3e | 205 | |
026df6ca | 206 | if (console_loglevel >= CONSOLE_LOGLEVEL_DEBUG) { |
36fc2d15 | 207 | uart_debug = true; |
7852ec05 PW |
208 | pr_info("%s used as console in debug mode: uart%d clocks will not be gated", |
209 | uart_name, uart->num); | |
36fc2d15 | 210 | } |
8612bd22 | 211 | } |
6f251e9d | 212 | } while (1); |
3e16f925 TL |
213 | |
214 | return 0; | |
b3c6df3a | 215 | } |
8dd5ea72 | 216 | omap_postcore_initcall(omap_serial_early_init); |
b3c6df3a | 217 | |
f62349ee MW |
218 | /** |
219 | * omap_serial_init_port() - initialize single serial port | |
40e44399 | 220 | * @bdata: port specific board data pointer |
c86845db | 221 | * @info: platform specific data pointer |
f62349ee | 222 | * |
40e44399 | 223 | * This function initialies serial driver for given port only. |
f62349ee MW |
224 | * Platforms can call this function instead of omap_serial_init() |
225 | * if they don't plan to use all available UARTs as serial ports. | |
226 | * | |
227 | * Don't mix calls to omap_serial_init_port() and omap_serial_init(), | |
228 | * use only one of the two. | |
229 | */ | |
c86845db D |
230 | void __init omap_serial_init_port(struct omap_board_data *bdata, |
231 | struct omap_uart_port_info *info) | |
b3c6df3a | 232 | { |
f62349ee | 233 | struct omap_uart_state *uart; |
6f251e9d | 234 | struct omap_hwmod *oh; |
3528c58e | 235 | struct platform_device *pdev; |
6f251e9d KH |
236 | void *pdata = NULL; |
237 | u32 pdata_size = 0; | |
238 | char *name; | |
6f251e9d | 239 | struct omap_uart_port_info omap_up; |
970a724d | 240 | |
40e44399 | 241 | if (WARN_ON(!bdata)) |
6f251e9d | 242 | return; |
40e44399 TL |
243 | if (WARN_ON(bdata->id < 0)) |
244 | return; | |
245 | if (WARN_ON(bdata->id >= num_uarts)) | |
e88d556d | 246 | return; |
f62349ee | 247 | |
6f251e9d | 248 | list_for_each_entry(uart, &uart_list, node) |
40e44399 | 249 | if (bdata->id == uart->num) |
6f251e9d | 250 | break; |
c86845db D |
251 | if (!info) |
252 | info = omap_serial_default_info; | |
f2eeeae0 | 253 | |
6f251e9d | 254 | oh = uart->oh; |
1349ba02 | 255 | name = OMAP_SERIAL_DRIVER_NAME; |
6f251e9d | 256 | |
c86845db | 257 | omap_up.dma_enabled = info->dma_enabled; |
6f251e9d | 258 | omap_up.uartclk = OMAP24XX_BASE_BAUD * 16; |
273558b3 | 259 | omap_up.flags = UPF_BOOT_AUTOCONF; |
ec3bebc6 | 260 | omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count; |
62f3ec5f | 261 | omap_up.enable_wakeup = omap_uart_enable_wakeup; |
c86845db D |
262 | omap_up.dma_rx_buf_size = info->dma_rx_buf_size; |
263 | omap_up.dma_rx_timeout = info->dma_rx_timeout; | |
a9e210e0 | 264 | omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate; |
c86845db | 265 | omap_up.autosuspend_timeout = info->autosuspend_timeout; |
94734749 | 266 | |
6f251e9d KH |
267 | pdata = &omap_up; |
268 | pdata_size = sizeof(struct omap_uart_port_info); | |
6f251e9d KH |
269 | |
270 | if (WARN_ON(!oh)) | |
271 | return; | |
272 | ||
c1d1cd59 | 273 | pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size); |
a032d33b PW |
274 | if (IS_ERR(pdev)) { |
275 | WARN(1, "Could not build omap_device for %s: %s.\n", name, | |
276 | oh->name); | |
277 | return; | |
278 | } | |
6f251e9d | 279 | |
40e44399 TL |
280 | oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt); |
281 | ||
44b1d42a KH |
282 | if (console_uart_id == bdata->id) { |
283 | omap_device_enable(pdev); | |
284 | pm_runtime_set_active(&pdev->dev); | |
285 | } | |
286 | ||
6f251e9d KH |
287 | oh->dev_attr = uart; |
288 | ||
36fc2d15 G |
289 | if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads) |
290 | && !uart_debug) | |
3528c58e | 291 | device_init_wakeup(&pdev->dev, true); |
f62349ee MW |
292 | } |
293 | ||
294 | /** | |
c86845db D |
295 | * omap_serial_board_init() - initialize all supported serial ports |
296 | * @info: platform specific data pointer | |
f62349ee MW |
297 | * |
298 | * Initializes all available UARTs as serial ports. Platforms | |
299 | * can call this function when they want to have default behaviour | |
300 | * for serial ports (e.g initialize them all as serial ports). | |
301 | */ | |
c86845db | 302 | void __init omap_serial_board_init(struct omap_uart_port_info *info) |
f62349ee | 303 | { |
6f251e9d | 304 | struct omap_uart_state *uart; |
40e44399 | 305 | struct omap_board_data bdata; |
f62349ee | 306 | |
40e44399 TL |
307 | list_for_each_entry(uart, &uart_list, node) { |
308 | bdata.id = uart->num; | |
309 | bdata.flags = 0; | |
310 | bdata.pads = NULL; | |
311 | bdata.pads_cnt = 0; | |
7496ba30 | 312 | |
91930652 | 313 | omap_serial_check_wakeup(&bdata, uart); |
7496ba30 | 314 | |
c86845db D |
315 | if (!info) |
316 | omap_serial_init_port(&bdata, NULL); | |
317 | else | |
318 | omap_serial_init_port(&bdata, &info[uart->num]); | |
40e44399 | 319 | } |
1dbae815 | 320 | } |
c86845db D |
321 | |
322 | /** | |
323 | * omap_serial_init() - initialize all supported serial ports | |
324 | * | |
325 | * Initializes all available UARTs. | |
326 | * Platforms can call this function when they want to have default behaviour | |
327 | * for serial ports (e.g initialize them all as serial ports). | |
328 | */ | |
329 | void __init omap_serial_init(void) | |
330 | { | |
331 | omap_serial_board_init(NULL); | |
332 | } |