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/Linux-v6.1/Documentation/devicetree/bindings/serial/
Dnvidia,tegra20-hsuart.txt27 - nvidia,adjust-baud-rates: List of entries providing percentage of baud rate
31 When baud rate set on controller falls within the range mentioned in this
32 field, baud rate will be adjusted by percentage mentioned here.
34 Increase baud rate by 2% when set baud rate falls within range 9600 to 115200
36 Baud Rate tolerance:
37 Standard UART devices are expected to have tolerance for baud rate error by
39 Tegra186 chip has a known hardware issue. UART Rx baud rate tolerance level
41 corruption/invalid framing errors. Parker errata suggests adjusting baud
45 its spec) for valid range and Tegra baud rate has to be set above actual
46 Tx baud rate observed. To do this we use nvidia,adjust-baud-rates
[all …]
Dserial.yaml117 The maximum baud rate the device operates at.
121 baud rates.
126 The current baud rate the device operates at.
128 the baud rate of the slave device.
130 * device supports auto-baud
133 * device baud rate is configured by its firmware but there is no
/Linux-v6.1/arch/mips/pic32/pic32mzda/
Dearly_console.c50 static void __init configure_uart(int port, int baud) in configure_uart() argument
57 __raw_writel(((pbclk / baud) / 16) - 1, uart_base + U_BRG(port)); in configure_uart()
63 static void __init setup_early_console(int port, int baud) in setup_early_console() argument
69 configure_uart(console_port, baud); in setup_early_console()
111 int baud = -1; in get_baud_from_cmdline() local
124 baud = 0; in get_baud_from_cmdline()
126 baud = baud * 10 + *s++ - '0'; in get_baud_from_cmdline()
130 return baud; in get_baud_from_cmdline()
136 int baud, port; in fw_init_early_console() local
140 baud = get_baud_from_cmdline(arch_cmdline); in fw_init_early_console()
[all …]
/Linux-v6.1/arch/m68k/atari/
Ddebug.c168 int baud = cflag & CBAUD; in atari_init_mfp_port() local
173 baud += B38400; in atari_init_mfp_port()
174 if (baud < B1200 || baud > B38400+2) in atari_init_mfp_port()
175 baud = B9600; /* use default 9600bps for non-implemented rates */ in atari_init_mfp_port()
176 baud -= B1200; /* baud_table[] starts at 1200bps */ in atari_init_mfp_port()
181 st_mfp.tim_dt_d = baud_table[baud]; in atari_init_mfp_port()
218 int baud = cflag & CBAUD; in atari_init_scc_port() local
222 baud += B38400; in atari_init_scc_port()
223 if (baud < B1200 || baud > B38400+2) in atari_init_scc_port()
224 baud = B9600; /* use default 9600bps for non-implemented rates */ in atari_init_scc_port()
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/Linux-v6.1/drivers/usb/serial/
Dpl2303.c569 * Returns the nearest supported baud rate that can be set directly without
572 static speed_t pl2303_get_supported_baud_rate(speed_t baud) in pl2303_get_supported_baud_rate() argument
583 if (baud_sup[i] > baud) in pl2303_get_supported_baud_rate()
588 baud = baud_sup[i - 1]; in pl2303_get_supported_baud_rate()
589 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) in pl2303_get_supported_baud_rate()
590 baud = baud_sup[i - 1]; in pl2303_get_supported_baud_rate()
592 baud = baud_sup[i]; in pl2303_get_supported_baud_rate()
594 return baud; in pl2303_get_supported_baud_rate()
598 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
599 * use 9600 baud.
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/Linux-v6.1/arch/x86/boot/
Dearly_serial_console.c26 static void early_serial_init(int port, int baud) in early_serial_init() argument
36 divisor = 115200 / baud; in early_serial_init()
48 int baud = DEFAULT_BAUD; in parse_earlyprintk() local
92 baud = simple_strtoull(arg + pos, &e, 0); in parse_earlyprintk()
93 if (baud == 0 || arg + pos == e) in parse_earlyprintk()
94 baud = DEFAULT_BAUD; in parse_earlyprintk()
98 early_serial_init(port, baud); in parse_earlyprintk()
120 int baud = DEFAULT_BAUD; in parse_console_uart8250() local
140 baud = simple_strtoull(options + 1, &options, 0); in parse_console_uart8250()
142 baud = probe_baud(port); in parse_console_uart8250()
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/Linux-v6.1/drivers/tty/serial/
Dsuncore.c89 int baud, bits, stop, cflag; in sunserial_console_termios() local
121 baud = simple_strtoul(s, NULL, 0); in sunserial_console_termios()
131 switch (baud) { in sunserial_console_termios()
145 default: baud = 9600; cflag |= B9600; break; in sunserial_console_termios()
170 /* Sun serial MOUSE auto baud rate detection. */
172 int baud; member
187 for (i = 0; mouse_baud_table[i].baud != -1; i++) in suncore_mouse_baud_cflag_next()
192 if (mouse_baud_table[i].baud == -1) in suncore_mouse_baud_cflag_next()
195 *new_baud = mouse_baud_table[i].baud; in suncore_mouse_baud_cflag_next()
201 /* Basically, when the baud rate is wrong the mouse spits out
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Dxilinx_uartps.c53 #define CDNS_UART_BAUDGEN 0x18 /* Baud Rate Generator */
60 #define CDNS_UART_BAUDDIV 0x34 /* Baud Rate Divider */
180 /* baud dividers min/max values */
192 * @baud: Current baud rate
202 unsigned int baud; member
379 * cdns_uart_calc_baud_divs - Calculate baud rate divisors
381 * @baud: Desired baud rate
385 * Return: baud rate, requested baud when possible, or actual baud when there
388 * Formula to obtain baud rate is
395 * baud rate generate register
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D21285.c84 * BAUD_BASE / baud - 1
85 * However, typically BAUD_BASE is not divisible by baud, so
88 * int(BAUD_BASE / baud - 0.5) ->
89 * int(BAUD_BASE / baud - (baud >> 1) / baud) ->
90 * int((BAUD_BASE - (baud >> 1)) / baud)
249 unsigned int baud, quot, h_lcr, b; in serial21285_set_termios() local
265 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); in serial21285_set_termios()
266 quot = uart_get_divisor(port, baud); in serial21285_set_termios()
301 uart_update_timeout(port, termios->c_cflag, baud); in serial21285_set_termios()
421 serial21285_get_options(struct uart_port *port, int *baud, in serial21285_get_options() argument
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Dvt8500_serial.c33 #define VT8500_URDIV 0x0008 /* Clock/Baud rate divisor */
301 static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud) in vt8500_set_baud_rate() argument
309 div |= (uart_get_divisor(port, baud) - 1) & 0x3ff; in vt8500_set_baud_rate()
311 /* Effective baud rate */ in vt8500_set_baud_rate()
312 baud = port->uartclk / 16 / ((div & 0x3ff) + 1); in vt8500_set_baud_rate()
319 /* Break signal timing depends on baud rate, update accordingly */ in vt8500_set_baud_rate()
320 vt8500_write(port, mult_frac(baud, 4096, 1000000), VT8500_URBKR); in vt8500_set_baud_rate()
322 return baud; in vt8500_set_baud_rate()
364 unsigned int baud, lcr; in vt8500_set_termios() local
369 /* calculate and set baud rate */ in vt8500_set_termios()
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Dar933x_uart.c253 unsigned int baud, in ar933x_uart_get_scale_step() argument
263 min_diff = baud; in ar933x_uart_get_scale_step()
268 tstep = baud * (tscale + 1); in ar933x_uart_get_scale_step()
275 diff = abs(ar933x_uart_get_baud(clk, tscale, tstep) - baud); in ar933x_uart_get_scale_step()
292 unsigned int baud, scale, step; in ar933x_uart_set_termios() local
314 baud = uart_get_baud_rate(port, new, old, up->min_baud, up->max_baud); in ar933x_uart_set_termios()
315 ar933x_uart_get_scale_step(port->uartclk, baud, &scale, &step); in ar933x_uart_set_termios()
328 uart_update_timeout(port, new->c_cflag, baud); in ar933x_uart_set_termios()
358 tty_termios_encode_baud_rate(new, baud, baud); in ar933x_uart_set_termios()
666 int baud = 115200; in ar933x_uart_console_setup() local
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Dsunsab.c10 * Fixed to use tty_get_baud_rate, and to allow for arbitrary baud
85 #define SAB82532_MAX_TEC_TIMEOUT 200000 /* 1 character time (at 50 baud) */
86 #define SAB82532_MAX_CEC_TIMEOUT 50000 /* 2.5 TX CLKs (at 50 baud) */
622 * transmitted at 9600 baud during shutdown (regardless of the in sunsab_shutdown()
639 * The formula is: Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)),
644 static void calc_ebrg(int baud, int *n_ret, int *m_ret) in calc_ebrg() argument
648 if (baud == 0) { in calc_ebrg()
659 n = (SAB_BASE_BAUD * 10) / baud; in calc_ebrg()
680 unsigned int iflag, unsigned int baud, in sunsab_convert_to_sab() argument
709 calc_ebrg(baud, &n, &m); in sunsab_convert_to_sab()
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Darc_uart.c97 unsigned long baud; member
357 unsigned int baud, uartl, uarth, hw_val; in arc_serial_set_termios() local
361 * Use the generic handler so that any specially encoded baud rates in arc_serial_set_termios()
363 * Max Baud I suppose will not be more than current 115K * 4 in arc_serial_set_termios()
364 * Formula for ARC UART is: hw-val = ((CLK/(BAUD*4)) -1) in arc_serial_set_termios()
367 baud = uart_get_baud_rate(port, new, old, 0, 460800); in arc_serial_set_termios()
369 hw_val = port->uartclk / (uart->baud * 4) - 1; in arc_serial_set_termios()
394 tty_termios_encode_baud_rate(new, baud, baud); in arc_serial_set_termios()
396 uart_update_timeout(port, new->c_cflag, baud); in arc_serial_set_termios()
485 int baud = 115200; in arc_serial_console_setup() local
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/Linux-v6.1/drivers/net/hamradio/
Dbaycom_ser_fdx.c15 * ser12: This is a very simple 1200 baud AFSK modem. The modem consists only
27 * hsk: This is a 4800 baud FSK modem, designed for TNC use. It works fine
37 * '#' denotes the baud rate / 100, eg. ser12* is '1200 baud, soft DCD'
39 * baud baud rate (between 300 and 4800)
115 unsigned int baud, baud_us, baud_arbdiv, baud_uartdiv, baud_dcdtimeout; member
388 if (bc->baud < 300 || bc->baud > 4800) { in ser12_open()
399 bc->hdrv.par.bitrate = bc->baud; in ser12_open()
400 bc->baud_us = 1000000/bc->baud; in ser12_open()
401 bc->baud_uartdiv = (115200/8)/bc->baud; in ser12_open()
416 * the baud rate is set to produce 100 ints/sec in ser12_open()
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/Linux-v6.1/arch/x86/kernel/
Dearly_printk.c151 unsigned long baud = DEFAULT_BAUD; in early_serial_init() local
177 baud = simple_strtoull(s, &e, 0); in early_serial_init()
179 if (baud == 0 || s == e) in early_serial_init()
180 baud = DEFAULT_BAUD; in early_serial_init()
183 /* Convert from baud to divisor value */ in early_serial_init()
184 divisor = 115200 / baud; in early_serial_init()
213 * The rest of the param should be "[force],B:D.F,baud", where B, D & F describe
220 unsigned long baud = DEFAULT_BAUD; in early_pci_serial_init() local
255 /* A baud might be following */ in early_pci_serial_init()
308 if (kstrtoul(s, 0, &baud) < 0 || baud == 0) in early_pci_serial_init()
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/Linux-v6.1/drivers/tty/serial/8250/
D8250_mtk.c303 unsigned int baud, quot, fraction; in mtk8250_set_termios() local
319 * Store the requested baud rate before calling the generic 8250 in mtk8250_set_termios()
321 * no higher than (uartclk / 16) so the baud will be clamped if it in mtk8250_set_termios()
323 * higher than that, therefore we'll get original baud rate back in mtk8250_set_termios()
327 baud = tty_termios_baud_rate(termios); in mtk8250_set_termios()
331 tty_termios_encode_baud_rate(termios, baud, baud); in mtk8250_set_termios()
346 baud = uart_get_baud_rate(port, termios, old, in mtk8250_set_termios()
350 if (baud < 115200) { in mtk8250_set_termios()
352 quot = uart_get_divisor(port, baud); in mtk8250_set_termios()
355 quot = DIV_ROUND_UP(port->uartclk, 256 * baud); in mtk8250_set_termios()
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D8250_pericom.c51 static void pericom_do_set_divisor(struct uart_port *port, unsigned int baud, in pericom_do_set_divisor() argument
58 unsigned int divisor = max(maxrate / baud, 1U); in pericom_do_set_divisor()
59 int delta = maxrate / divisor - baud; in pericom_do_set_divisor()
61 if (baud > maxrate + baud / 50) in pericom_do_set_divisor()
64 if (delta > baud / 50) in pericom_do_set_divisor()
71 delta = maxrate / divisor - baud; in pericom_do_set_divisor()
72 if (abs(delta) < baud / 50) { in pericom_do_set_divisor()
D8250_bcm7271.c7 * optional features including the ability to use a baud rate clock
8 * mux for more accurate high speed baud rate selection and also
667 dev_err(dev, "Error selecting BAUD MUX clock for %u\n", in init_real_clk_rates()
678 u32 baud) in set_clock_mux() argument
693 /* If the Baud Mux Clock was not specified, just return */ in set_clock_mux()
697 /* Find the closest match for specified baud */ in set_clock_mux()
702 quot = DIV_ROUND_CLOSEST(rate, baud); in set_clock_mux()
708 hires_baud = (u64)baud * 10000; in set_clock_mux()
718 percent = (unsigned long)DIV_ROUND_CLOSEST_ULL(hires_err, baud); in set_clock_mux()
720 "Baud rate: %u, MUX Clk: %u, Error: %u.%u%%\n", in set_clock_mux()
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D8250_dwlib.c68 * quot = div(I) = clk / (16 * baud)
71 * let rem = clk % (16 * baud)
72 * we have: div(F) * (16 * baud) = rem
73 * so frac = 2^dlf_size * rem / (16 * baud) = (rem << dlf_size) / (16 * baud)
75 static unsigned int dw8250_get_divisor(struct uart_port *p, unsigned int baud, in dw8250_get_divisor() argument
78 unsigned int quot, rem, base_baud = baud * 16; in dw8250_get_divisor()
88 static void dw8250_set_divisor(struct uart_port *p, unsigned int baud, in dw8250_set_divisor() argument
92 serial8250_do_set_divisor(p, baud, quot, quot_frac); in dw8250_set_divisor()
D8250_ingenic.c95 int baud = 115200; in ingenic_early_console_setup() local
103 uart_parse_options(opt, &baud, &parity, &bits, &flow); in ingenic_early_console_setup()
108 if (dev->baud) in ingenic_early_console_setup()
109 baud = dev->baud; in ingenic_early_console_setup()
110 divisor = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); in ingenic_early_console_setup()
264 data->clk_baud = devm_clk_get(&pdev->dev, "baud"); in ingenic_uart_probe()
267 "unable to get baud clock\n"); in ingenic_uart_probe()
277 dev_err(&pdev->dev, "could not enable baud clock: %d\n", err); in ingenic_uart_probe()
/Linux-v6.1/Documentation/misc-devices/
Doxsemi-tornado.rst10 The baud rate produced by the baud generator is obtained from this input
16 determine the actual baud rate used. Baud rates from 15625000bps down
23 used for the divisor to obtain the requested baud rates by software that
41 Here are the figures for the standard and some non-standard baud rates
88 With the baud base set to 15625000 and the unsigned 16-bit UART_DIV_MAX
89 limitation imposed by ``serial8250_get_baud_rate`` standard baud rates
91 200bps requires the baud base to be divided by 78125 and that is beyond
108 the baud rate of 38400bps. Note that the value of 0 in TCR sets the
115 respectively. These parameters will set the baud rate for the serial
/Linux-v6.1/drivers/tty/
Dtty_baudrate.c15 * Routine which returns the baud rate of the tty
50 * Convert termios baud rate data into a speed. This should be called
80 * Convert termios baud rate data into a speed. This should be called
163 * Our goal is to find a close match to the standard baud rate in tty_termios_encode_baud_rate()
164 * returned. Walk the baud rate table and if we get a very close in tty_termios_encode_baud_rate()
201 * tty_encode_baud_rate - set baud rate of the tty
203 * @ibaud: input baud rate
204 * @obaud: output baud rate
/Linux-v6.1/arch/mips/sni/
Dsetup.c63 char *baud; in sni_console_setup() local
74 baud = prom_getenv("lbaud"); in sni_console_setup()
78 baud = prom_getenv("rbaud"); in sni_console_setup()
81 if (baud) in sni_console_setup()
82 strcpy(options, baud); in sni_console_setup()
85 baud ? options : NULL); in sni_console_setup()
88 baud ? options : NULL); in sni_console_setup()
/Linux-v6.1/Documentation/devicetree/bindings/sound/
Dserial-midi.yaml19 Can only be set to use standard baud rates corresponding to supported rates of the
20 parent serial device. If the standard MIDI baud of 31.25 kBaud is needed
22 configure the clocks of the parent serial device so that a requested baud of 38.4 kBaud
23 resuts in the standard MIDI baud rate, and set the 'current-speed' property to 38400 (default)
/Linux-v6.1/arch/arm/boot/dts/
Dmeson6.dtsi57 clock-names = "xtal", "pclk", "baud";
62 clock-names = "xtal", "pclk", "baud";
67 clock-names = "xtal", "pclk", "baud";
72 clock-names = "xtal", "pclk", "baud";

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