xref: /openbmc/u-boot/drivers/serial/Kconfig (revision 729c2db7)
1#
2# Serial device configuration
3#
4
5menu "Serial drivers"
6
7config REQUIRE_SERIAL_CONSOLE
8	bool "Require a serial port for console"
9	# Running without a serial console is not supported by the
10	# non-dm serial code
11	depends on DM_SERIAL
12	default y
13	help
14	  Require a serial port for the console, and panic if none is found
15	  during serial port initialization (default y). Set this to n on
16	  boards which have no debug serial port whatsoever.
17
18config SERIAL_PRESENT
19	bool "Provide a serial driver"
20	depends on DM_SERIAL
21	default y
22	help
23	  In very space-constrained devices even the full UART driver is too
24	  large. In this case the debug UART can still be used in some cases.
25	  This option enables the full UART in U-Boot, so if is it disabled,
26	  the full UART driver will be omitted, thus saving space.
27
28config SPL_SERIAL_PRESENT
29	bool "Provide a serial driver in SPL"
30	depends on DM_SERIAL
31	default y
32	help
33	  In very space-constrained devices even the full UART driver is too
34	  large. In this case the debug UART can still be used in some cases.
35	  This option enables the full UART in SPL, so if is it disabled,
36	  the full UART driver will be omitted, thus saving space.
37
38config DM_SERIAL
39	bool "Enable Driver Model for serial drivers"
40	depends on DM
41	help
42	  Enable driver model for serial. This replaces
43	  drivers/serial/serial.c with the serial uclass, which
44	  implements serial_putc() etc. The uclass interface is
45	  defined in include/serial.h.
46
47config DEBUG_UART
48	bool "Enable an early debug UART for debugging"
49	help
50	  The debug UART is intended for use very early in U-Boot to debug
51	  problems when an ICE or other debug mechanism is not available.
52
53	  To use it you should:
54	  - Make sure your UART supports this interface
55	  - Enable CONFIG_DEBUG_UART
56	  - Enable the CONFIG for your UART to tell it to provide this interface
57	        (e.g. CONFIG_DEBUG_UART_NS16550)
58	  - Define the required settings as needed (see below)
59	  - Call debug_uart_init() before use
60	  - Call debug_uart_putc() to output a character
61
62	  Depending on your platform it may be possible to use this UART before
63	  a stack is available.
64
65	  If your UART does not support this interface you can probably add
66	  support quite easily. Remember that you cannot use driver model and
67	  it is preferred to use no stack.
68
69	  You must not use this UART once driver model is working and the
70	  serial drivers are up and running (done in serial_init()). Otherwise
71	  the drivers may conflict and you will get strange output.
72
73choice
74	prompt "Select which UART will provide the debug UART"
75	depends on DEBUG_UART
76	default DEBUG_UART_NS16550
77
78config DEBUG_UART_ALTERA_JTAGUART
79	bool "Altera JTAG UART"
80	help
81	  Select this to enable a debug UART using the altera_jtag_uart driver.
82	  You will need to provide parameters to make this work. The driver will
83	  be available until the real driver model serial is running.
84
85config DEBUG_UART_ALTERA_UART
86	bool "Altera UART"
87	help
88	  Select this to enable a debug UART using the altera_uart driver.
89	  You will need to provide parameters to make this work. The driver will
90	  be available until the real driver model serial is running.
91
92config DEBUG_UART_AR933X
93	bool "QCA/Atheros ar933x"
94	depends on AR933X_UART
95	help
96	  Select this to enable a debug UART using the ar933x uart driver.
97	  You will need to provide parameters to make this work. The
98	  driver will be available until the real driver model serial is
99	  running.
100
101config DEBUG_UART_NS16550
102	bool "ns16550"
103	help
104	  Select this to enable a debug UART using the ns16550 driver. You
105	  will need to provide parameters to make this work. The driver will
106	  be available until the real driver model serial is running.
107
108config DEBUG_EFI_CONSOLE
109	bool "EFI"
110	depends on EFI_APP
111	help
112	  Select this to enable a debug console which calls back to EFI to
113	  output to the console. This can be useful for early debugging of
114	  U-Boot when running on top of EFI (Extensive Firmware Interface).
115	  This is a type of BIOS used by PCs.
116
117config DEBUG_UART_S5P
118	bool "Samsung S5P"
119	help
120	  Select this to enable a debug UART using the serial_s5p driver. You
121	  will need to provide parameters to make this work. The driver will
122	  be available until the real driver-model serial is running.
123
124config DEBUG_UART_MESON
125	bool "Amlogic Meson"
126	depends on MESON_SERIAL
127	help
128	  Select this to enable a debug UART using the serial_meson driver. You
129	  will need to provide parameters to make this work. The driver will
130	  be available until the real driver-model serial is running.
131
132config DEBUG_UART_UARTLITE
133	bool "Xilinx Uartlite"
134	help
135	  Select this to enable a debug UART using the serial_uartlite driver.
136	  You will need to provide parameters to make this work. The driver will
137	  be available until the real driver-model serial is running.
138
139config DEBUG_UART_ARM_DCC
140	bool "ARM DCC"
141	help
142	  Select this to enable a debug UART using the ARM JTAG DCC port.
143	  The DCC port can be used for very early debugging and doesn't require
144	  any additional setting like address/baudrate/clock. On systems without
145	  any serial interface this is the easiest way how to get console.
146	  Every ARM core has own DCC port which is the part of debug interface.
147	  This port is available at least on ARMv6, ARMv7, ARMv8 and XScale
148	  architectures.
149
150config DEBUG_UART_ZYNQ
151	bool "Xilinx Zynq"
152	help
153	  Select this to enable a debug UART using the serial_zynq driver. You
154	  will need to provide parameters to make this work. The driver will
155	  be available until the real driver-model serial is running.
156
157config DEBUG_UART_APBUART
158	depends on LEON3
159	bool "Gaisler APBUART"
160	help
161	  Select this to enable a debug UART using the serial_leon3 driver. You
162	  will need to provide parameters to make this work. The driver will
163	  be available until the real driver model serial is running.
164
165config DEBUG_UART_PL010
166	bool "pl010"
167	help
168	  Select this to enable a debug UART using the pl01x driver with the
169	  PL010 UART type. You will need to provide parameters to make this
170	  work. The driver will be available until the real driver model
171	  serial is running.
172
173config DEBUG_UART_PL011
174	bool "pl011"
175	help
176	  Select this to enable a debug UART using the pl01x driver with the
177	  PL011 UART type. You will need to provide parameters to make this
178	  work. The driver will be available until the real driver model
179	  serial is running.
180
181config DEBUG_UART_PIC32
182	bool "Microchip PIC32"
183	depends on PIC32_SERIAL
184	help
185	  Select this to enable a debug UART using the serial_pic32 driver. You
186	  will need to provide parameters to make this work. The driver will
187	  be available until the real driver model serial is running.
188
189config DEBUG_UART_UNIPHIER
190	bool "UniPhier on-chip UART"
191	depends on ARCH_UNIPHIER
192	help
193	  Select this to enable a debug UART using the UniPhier on-chip UART.
194	  You will need to provide DEBUG_UART_BASE to make this work.  The
195	  driver will be available until the real driver-model serial is
196	  running.
197
198endchoice
199
200config DEBUG_UART_BASE
201	hex "Base address of UART"
202	depends on DEBUG_UART
203	help
204	  This is the base address of your UART for memory-mapped UARTs.
205
206	  A default should be provided by your board, but if not you will need
207	  to use the correct value here.
208
209config DEBUG_UART_CLOCK
210	int "UART input clock"
211	depends on DEBUG_UART
212	help
213	  The UART input clock determines the speed of the internal UART
214	  circuitry. The baud rate is derived from this by dividing the input
215	  clock down.
216
217	  A default should be provided by your board, but if not you will need
218	  to use the correct value here.
219
220config DEBUG_UART_SHIFT
221	int "UART register shift"
222	depends on DEBUG_UART
223	default 0 if DEBUG_UART
224	help
225	  Some UARTs (notably ns16550) support different register layouts
226	  where the registers are spaced either as bytes, words or some other
227	  value. Use this value to specify the shift to use, where 0=byte
228	  registers, 2=32-bit word registers, etc.
229
230config DEBUG_UART_BOARD_INIT
231	bool "Enable board-specific debug UART init"
232	depends on DEBUG_UART
233	help
234	  Some boards need to set things up before the debug UART can be used.
235	  On these boards a call to debug_uart_init() is insufficient. When
236	  this option is enabled, the function board_debug_uart_init() will
237	  be called when debug_uart_init() is called. You can put any code
238	  here that is needed to set up the UART ready for use, such as set
239	  pin multiplexing or enable clocks.
240
241config DEBUG_UART_ANNOUNCE
242	bool "Show a message when the debug UART starts up"
243	depends on DEBUG_UART
244	help
245	  Enable this option to show a message when the debug UART is ready
246	  for use. You will see a message like "<debug_uart> " as soon as
247	  U-Boot has the UART ready for use (i.e. your code calls
248	  debug_uart_init()). This can be useful just as a check that
249	  everything is working.
250
251config DEBUG_UART_SKIP_INIT
252	bool "Skip UART initialization"
253	help
254	  Select this if the UART you want to use for debug output is already
255	  initialized by the time U-Boot starts its execution.
256
257config ALTERA_JTAG_UART
258	bool "Altera JTAG UART support"
259	depends on DM_SERIAL
260	help
261	  Select this to enable an JTAG UART for Altera devices.The JTAG UART
262	  core implements a method to communicate serial character streams
263	  between a host PC and a Qsys system on an Altera FPGA. Please find
264	  details on the "Embedded Peripherals IP User Guide" of Altera.
265
266config ALTERA_JTAG_UART_BYPASS
267	bool "Bypass output when no connection"
268	depends on ALTERA_JTAG_UART
269	help
270	  Bypass console output and keep going even if there is no JTAG
271	  terminal connection with the host. The console output will resume
272	  once the JTAG terminal is connected. Without the bypass, the console
273	  output will wait forever until a JTAG terminal is connected. If you
274	  not are sure, say Y.
275
276config ALTERA_UART
277	bool "Altera UART support"
278	depends on DM_SERIAL
279	help
280	  Select this to enable an UART for Altera devices. Please find
281	  details on the "Embedded Peripherals IP User Guide" of Altera.
282
283config AR933X_UART
284	bool "QCA/Atheros ar933x UART support"
285	depends on DM_SERIAL && SOC_AR933X
286	help
287	  Select this to enable UART support for QCA/Atheros ar933x
288	  devices. This driver uses driver model and requires a device
289	  tree binding to operate, please refer to the document at
290	  doc/device-tree-bindings/serial/qca,ar9330-uart.txt.
291
292config FSL_LPUART
293	bool "Freescale LPUART support"
294	help
295	  Select this to enable a Low Power UART for Freescale VF610 and
296	  QorIQ Layerscape devices.
297
298config PIC32_SERIAL
299	bool "Support for Microchip PIC32 on-chip UART"
300	depends on DM_SERIAL && MACH_PIC32
301	default y
302	help
303	  Support for the UART found on Microchip PIC32 SoC's.
304
305config SYS_NS16550
306	bool "NS16550 UART or compatible"
307	help
308	  Support NS16550 UART or compatible. This can be enabled in the
309	  device tree with the correct input clock frequency. If the input
310	  clock frequency is not defined in the device tree, the macro
311	  CONFIG_SYS_NS16550_CLK defined in a legacy board header file will
312	  be used. It can be a constant or a function to get clock, eg,
313	  get_serial_clock().
314
315config ROCKCHIP_SERIAL
316	bool "Rockchip on-chip UART support"
317	depends on DM_SERIAL && SPL_OF_PLATDATA
318	help
319	  Select this to enable a debug UART for Rockchip devices when using
320	  CONFIG_OF_PLATDATA (i.e. a compiled-in device tree replacemenmt).
321	  This uses the ns16550 driver, converting the platdata from of-platdata
322	  to the ns16550 format.
323
324config SANDBOX_SERIAL
325	bool "Sandbox UART support"
326	depends on SANDBOX
327	help
328	  Select this to enable a seral UART for sandbox. This is required to
329	  operate correctly, otherwise you will see no serial output from
330	  sandbox. The emulated UART will display to the console and console
331	  input will be fed into the UART. This allows you to interact with
332	  U-Boot.
333
334	  The operation of the console is controlled by the -t command-line
335	  flag. In raw mode, U-Boot sees all characters from the terminal
336	  before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
337	  is processed by the terminal, and terminates U-Boot. Valid options
338	  are:
339
340	     -t raw-with-sigs	Raw mode, Ctrl-C will terminate U-Boot
341	     -t raw		Raw mode, Ctrl-C is processed by U-Boot
342	     -t cooked		Cooked mode, Ctrl-C terminates
343
344config UNIPHIER_SERIAL
345	bool "Support for UniPhier on-chip UART"
346	depends on ARCH_UNIPHIER
347	help
348	  If you have a UniPhier based board and want to use the on-chip
349	  serial ports, say Y to this option. If unsure, say N.
350
351config XILINX_UARTLITE
352	bool "Xilinx Uarlite support"
353	depends on DM_SERIAL && (MICROBLAZE || ARCH_ZYNQ || ARCH_ZYNQMP || 4xx)
354	help
355	  If you have a Xilinx based board and want to use the uartlite
356	  serial ports, say Y to this option. If unsure, say N.
357
358config MESON_SERIAL
359	bool "Support for Amlogic Meson UART"
360	depends on DM_SERIAL && ARCH_MESON
361	help
362	  If you have an Amlogic Meson based board and want to use the on-chip
363	  serial ports, say Y to this option. If unsure, say N.
364
365config MSM_SERIAL
366	bool "Qualcomm on-chip UART"
367	depends on DM_SERIAL
368	help
369	  Support Data Mover UART used on Qualcomm Snapdragon SoCs.
370	  It should support all Qualcomm devices with UARTDM version 1.4,
371	  for example APQ8016 and MSM8916.
372	  Single baudrate is supported in current implementation (115200).
373endmenu
374