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/linux/Documentation/devicetree/bindings/serial/
H A Dnvidia,tegra20-hsuart.yaml58 nvidia,adjust-baud-rates:
61 List of entries providing percentage of baud rate adjustment within a range. Each entry
62 contains a set of 3 values: range low/high and adjusted rate. When the baud rate set on the
63 controller falls within the range mentioned in this field, the baud rate will be adjusted by
68 Increase baud rate by 2% when set baud rate falls within range 9600 to 115200.
70 Standard UART devices are expected to have tolerance for baud rate error by -4 to +4 %. All
72 issue. UART RX baud rate tolerance level is 0% to +4% in 1-stop config. Otherwise, the
74 baud rate to be higher than the deviations observed in TX.
77 valid range and Tegra baud rate has to be set above actual TX baud rate observed. To do this
78 we use nvidia,adjust-baud-rates.
[all …]
H A Dserial-peripheral-props.yaml15 controller, might need similar properties, e.g. for configuring the baud
22 The maximum baud rate the device operates at.
26 baud rates.
31 The current baud rate the device operates at.
33 the baud rate of the slave device.
35 * device supports auto-baud
38 * device baud rate is configured by its firmware but there is no
/linux/arch/mips/pic32/pic32mzda/
H A 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/arch/m68k/atari/
H A 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()
[all …]
/linux/arch/x86/boot/
H A 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()
[all …]
/linux/drivers/tty/serial/
H A 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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H A 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)
228 unsigned int baud, quot, h_lcr, b; in serial21285_set_termios() local
244 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); in serial21285_set_termios()
245 quot = uart_get_divisor(port, baud); in serial21285_set_termios()
280 uart_update_timeout(port, termios->c_cflag, baud); in serial21285_set_termios()
400 serial21285_get_options(struct uart_port *port, int *baud, in serial21285_get_options() argument
[all …]
H A Dxilinx_uartps.c56 #define CDNS_UART_BAUDGEN 0x18 /* Baud Rate Generator */
63 #define CDNS_UART_BAUDDIV 0x34 /* Baud Rate Divider */
183 /* baud dividers min/max values */
195 * @baud: Current baud rate
209 unsigned int baud; member
503 * cdns_uart_calc_baud_divs - Calculate baud rate divisors
505 * @baud: Desired baud rate
509 * Return: baud rate, requested baud when possible, or actual baud when there
512 * Formula to obtain baud rate is
519 * baud rate generate register
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H A Desp32_uart.c362 static bool esp32_uart_set_baud(struct uart_port *port, u32 baud) in esp32_uart_set_baud() argument
365 u32 div = sclk / baud; in esp32_uart_set_baud()
372 div = sclk / baud; in esp32_uart_set_baud()
380 u32 frag = (sclk * 16) / baud - div * 16; in esp32_uart_set_baud()
396 u32 baud; in esp32_uart_set_termios() local
405 baud = uart_get_baud_rate(port, termios, old, in esp32_uart_set_termios()
449 if (baud) { in esp32_uart_set_termios()
450 esp32_uart_set_baud(port, baud); in esp32_uart_set_termios()
451 uart_update_timeout(port, termios->c_cflag, baud); in esp32_uart_set_termios()
454 baud = 115200; in esp32_uart_set_termios()
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H A Dvt8500_serial.c33 #define VT8500_URDIV 0x0008 /* Clock/Baud rate divisor */
279 static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud) in vt8500_set_baud_rate() argument
287 div |= (uart_get_divisor(port, baud) - 1) & 0x3ff; in vt8500_set_baud_rate()
289 /* Effective baud rate */ in vt8500_set_baud_rate()
290 baud = port->uartclk / 16 / ((div & 0x3ff) + 1); in vt8500_set_baud_rate()
297 /* Break signal timing depends on baud rate, update accordingly */ in vt8500_set_baud_rate()
298 vt8500_write(port, mult_frac(baud, 4096, 1000000), VT8500_URBKR); in vt8500_set_baud_rate()
300 return baud; in vt8500_set_baud_rate()
342 unsigned int baud, lcr; in vt8500_set_termios() local
347 /* calculate and set baud rate */ in vt8500_set_termios()
[all …]
H A 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()
658 int baud = 115200; in ar933x_uart_console_setup() local
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H A Dsunsab.c10 * Fixed to use tty_get_baud_rate, and to allow for arbitrary baud
86 #define SAB82532_MAX_TEC_TIMEOUT 200000 /* 1 character time (at 50 baud) */
87 #define SAB82532_MAX_CEC_TIMEOUT 50000 /* 2.5 TX CLKs (at 50 baud) */
623 * transmitted at 9600 baud during shutdown (regardless of the in sunsab_shutdown()
640 * The formula is: Baud = SAB_BASE_BAUD / ((N + 1) * (1 << M)),
645 static void calc_ebrg(int baud, int *n_ret, int *m_ret) in calc_ebrg() argument
649 if (baud == 0) { in calc_ebrg()
660 n = (SAB_BASE_BAUD * 10) / baud; in calc_ebrg()
681 unsigned int iflag, unsigned int baud, in sunsab_convert_to_sab() argument
710 calc_ebrg(baud, &n, &m); in sunsab_convert_to_sab()
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H A Dmax3100.c91 int baud; /* current baud rate */ member
410 unsigned int baud = port->uartclk / 16; in max3100_set_termios() local
411 unsigned int baud230400 = (baud == 230400) ? 1 : 0; in max3100_set_termios()
420 baud = tty_termios_baud_rate(termios); in max3100_set_termios()
422 switch (baud) { in max3100_set_termios()
425 baud = s->baud; in max3100_set_termios()
460 baud = s->baud; in max3100_set_termios()
463 baud = s->baud; in max3100_set_termios()
465 tty_termios_encode_baud_rate(termios, baud, baud); in max3100_set_termios()
466 s->baud = baud; in max3100_set_termios()
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/linux/Documentation/devicetree/bindings/w1/
H A Dw1-uart.yaml18 baud-rate and transmitted byte, which corresponds to a 1-Wire read bit,
21 The default baud-rate for reset and presence detection is 9600 and for
22 a 1-Wire read or write operation 115200. In case the actual baud-rate
35 The baud rate for the 1-Wire reset and presence detect.
40 The baud rate for the 1-Wire write-0 cycle.
45 The baud rate for the 1-Wire write-1 and read cycle.
/linux/arch/x86/kernel/
H A 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/drivers/tty/serial/8250/
H A 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
666 dev_err(dev, "Error selecting BAUD MUX clock for %u\n", in init_real_clk_rates()
676 static u32 find_quot(struct device *dev, u32 freq, u32 baud, u32 *percent) in find_quot() argument
685 quot = DIV_ROUND_CLOSEST(rate, baud); in find_quot()
691 hires_baud = (u64)baud * 10000; in find_quot()
699 *percent = (unsigned long)DIV_ROUND_CLOSEST_ULL(hires_err, baud); in find_quot()
701 dev_dbg(dev, "Baud rate: %u, MUX Clk: %u, Error: %u.%u%%\n", in find_quot()
702 baud, freq, *percent / 100, *percent % 100); in find_quot()
708 u32 baud) in set_clock_mux() argument
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H A D8250_mtk.c316 unsigned int baud, quot, fraction; in mtk8250_set_termios() local
332 * Store the requested baud rate before calling the generic 8250 in mtk8250_set_termios()
334 * no higher than (uartclk / 16) so the baud will be clamped if it in mtk8250_set_termios()
336 * higher than that, therefore we'll get original baud rate back in mtk8250_set_termios()
340 baud = tty_termios_baud_rate(termios); in mtk8250_set_termios()
344 tty_termios_encode_baud_rate(termios, baud, baud); in mtk8250_set_termios()
359 baud = uart_get_baud_rate(port, termios, old, in mtk8250_set_termios()
363 if (baud < 115200) { in mtk8250_set_termios()
365 quot = uart_get_divisor(port, baud); in mtk8250_set_termios()
368 quot = DIV_ROUND_UP(port->uartclk, 256 * baud); in mtk8250_set_termios()
[all …]
H A 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()
H A 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); in dw8250_set_divisor()
H A D8250_ingenic.c94 int baud = 115200; in ingenic_earlycon_setup_tail() local
102 uart_parse_options(opt, &baud, &parity, &bits, &flow); in ingenic_earlycon_setup_tail()
105 if (dev->baud) in ingenic_earlycon_setup_tail()
106 baud = dev->baud; in ingenic_earlycon_setup_tail()
107 divisor = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); in ingenic_earlycon_setup_tail()
282 data->clk_baud = devm_clk_get(&pdev->dev, "baud"); in ingenic_uart_probe()
285 "unable to get baud clock\n"); in ingenic_uart_probe()
295 dev_err(&pdev->dev, "could not enable baud clock: %d\n", err); in ingenic_uart_probe()
/linux/Documentation/misc-devices/
H A 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/drivers/clk/at91/
H A Dsama7g5.c29 * @PLL_ID_BAUD: Baud PLL identifier
590 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
598 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
606 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
614 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
622 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
630 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
638 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
646 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
654 .pp = { PLL_IDS_TO_ARR_ENTRY(SYS, DIV0), PLL_IDS_TO_ARR_ENTRY(BAUD, DIV0), },
[all …]
/linux/drivers/tty/
H A 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/Documentation/w1/masters/
H A Dw1-uart.rst21 combination of baud-rate and transmitted byte, which corresponds to a
25 the baud-rate 9600, i.e. 104.2 us per bit. The transmitted byte 0xf0 over
31 Similar for a 1-Wire read bit or write bit, which uses the baud-rate
36 The default baud-rate for reset and presence detection is 9600 and for
37 a 1-Wire read or write operation 115200. In case the actual baud-rate
/linux/arch/mips/sni/
H A Dsetup.c65 char *baud; in sni_console_setup() local
76 baud = prom_getenv("lbaud"); in sni_console_setup()
80 baud = prom_getenv("rbaud"); in sni_console_setup()
83 if (baud) in sni_console_setup()
84 strcpy(options, baud); in sni_console_setup()
87 baud ? options : NULL); in sni_console_setup()
90 baud ? options : NULL); in sni_console_setup()

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