| /kernel/linux/linux-5.10/Documentation/devicetree/bindings/serial/ |
| D | nvidia,tegra20-hsuart.txt | 27 - 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
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| /kernel/linux/linux-6.6/Documentation/devicetree/bindings/serial/ |
| D | nvidia,tegra20-hsuart.yaml | 58 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.
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| /kernel/linux/linux-5.10/arch/mips/pic32/pic32mzda/ |
| D | early_console.c | 50 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()
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| /kernel/linux/linux-6.6/arch/mips/pic32/pic32mzda/ |
| D | early_console.c | 50 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()
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| /kernel/linux/linux-6.6/arch/m68k/atari/ |
| D | debug.c | 168 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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| /kernel/linux/linux-5.10/arch/m68k/atari/ |
| D | debug.c | 168 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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| /kernel/linux/linux-6.6/drivers/usb/serial/ |
| D | pl2303.c | 572 * Returns the nearest supported baud rate that can be set directly without
575 static speed_t pl2303_get_supported_baud_rate(speed_t baud) in pl2303_get_supported_baud_rate() argument
586 if (baud_sup[i] > baud) in pl2303_get_supported_baud_rate()
591 baud = baud_sup[i - 1]; in pl2303_get_supported_baud_rate()
592 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) in pl2303_get_supported_baud_rate()
593 baud = baud_sup[i - 1]; in pl2303_get_supported_baud_rate()
595 baud = baud_sup[i]; in pl2303_get_supported_baud_rate()
597 return baud; in pl2303_get_supported_baud_rate()
601 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
602 * use 9600 baud.
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| /kernel/linux/linux-5.10/arch/x86/boot/ |
| D | early_serial_console.c | 26 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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| /kernel/linux/linux-6.6/arch/x86/boot/ |
| D | early_serial_console.c | 26 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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| /kernel/linux/linux-6.6/drivers/tty/serial/ |
| D | suncore.c | 89 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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| D | xilinx_uartps.c | 53 #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
377 * cdns_uart_calc_baud_divs - Calculate baud rate divisors
379 * @baud: Desired baud rate
383 * Return: baud rate, requested baud when possible, or actual baud when there
386 * Formula to obtain baud rate is
393 * baud rate generate register
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| D | 21285.c | 84 * 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
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| /kernel/linux/linux-5.10/drivers/tty/serial/ |
| D | suncore.c | 89 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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| D | 21285.c | 84 * 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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| D | xilinx_uartps.c | 53 #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
201 unsigned int baud; member
393 * cdns_uart_calc_baud_divs - Calculate baud rate divisors
395 * @baud: Desired baud rate
399 * Return: baud rate, requested baud when possible, or actual baud when there
402 * Formula to obtain baud rate is
409 * baud rate generate register
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| D | vt8500_serial.c | 33 #define VT8500_URDIV 0x0008 /* Clock/Baud rate divisor */
302 static int vt8500_set_baud_rate(struct uart_port *port, unsigned int baud) in vt8500_set_baud_rate() argument
310 div |= (uart_get_divisor(port, baud) - 1) & 0x3ff; in vt8500_set_baud_rate()
312 /* Effective baud rate */ in vt8500_set_baud_rate()
313 baud = port->uartclk / 16 / ((div & 0x3ff) + 1); in vt8500_set_baud_rate()
320 /* Break signal timing depends on baud rate, update accordingly */ in vt8500_set_baud_rate()
321 vt8500_write(port, mult_frac(baud, 4096, 1000000), VT8500_URBKR); in vt8500_set_baud_rate()
323 return baud; in vt8500_set_baud_rate()
365 unsigned int baud, lcr; in vt8500_set_termios() local
370 /* calculate and set baud rate */ in vt8500_set_termios()
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| /kernel/linux/linux-5.10/drivers/usb/serial/ |
| D | pl2303.c | 482 * Returns the nearest supported baud rate that can be set directly without
485 static speed_t pl2303_get_supported_baud_rate(speed_t baud) in pl2303_get_supported_baud_rate() argument
496 if (baud_sup[i] > baud) in pl2303_get_supported_baud_rate()
501 baud = baud_sup[i - 1]; in pl2303_get_supported_baud_rate()
502 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) in pl2303_get_supported_baud_rate()
503 baud = baud_sup[i - 1]; in pl2303_get_supported_baud_rate()
505 baud = baud_sup[i]; in pl2303_get_supported_baud_rate()
507 return baud; in pl2303_get_supported_baud_rate()
511 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
512 * use 9600 baud.
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| /kernel/linux/linux-5.10/drivers/tty/serial/8250/ |
| D | 8250_dwlib.c | 53 * quot = div(I) = clk / (16 * baud)
56 * let rem = clk % (16 * baud)
57 * we have: div(F) * (16 * baud) = rem
58 * so frac = 2^dlf_size * rem / (16 * baud) = (rem << dlf_size) / (16 * baud)
60 static unsigned int dw8250_get_divisor(struct uart_port *p, unsigned int baud, in dw8250_get_divisor() argument
63 unsigned int quot, rem, base_baud = baud * 16; in dw8250_get_divisor()
73 static void dw8250_set_divisor(struct uart_port *p, unsigned int baud, in dw8250_set_divisor() argument
77 serial8250_do_set_divisor(p, baud, quot, quot_frac); in dw8250_set_divisor()
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| D | 8250_mtk.c | 303 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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| /kernel/linux/linux-5.10/drivers/net/hamradio/ |
| D | baycom_ser_fdx.c | 15 * 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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| /kernel/linux/linux-6.6/drivers/net/hamradio/ |
| D | baycom_ser_fdx.c | 15 * 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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| /kernel/linux/linux-5.10/arch/x86/kernel/ |
| D | early_printk.c | 151 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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| /kernel/linux/linux-6.6/arch/x86/kernel/ |
| D | early_printk.c | 151 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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| /kernel/linux/linux-5.10/arch/mips/include/asm/netlogic/xlp-hal/ |
| D | uart.h | 54 #define BAUD_DIVISOR(baud) (BASE_BAUD / baud) argument
103 nlm_uart_set_baudrate(uint64_t base, int baud) in nlm_uart_set_baudrate() argument
109 /* enable divisor register, and write baud values */ in nlm_uart_set_baudrate()
112 (BAUD_DIVISOR(baud) & 0xff)); in nlm_uart_set_baudrate()
114 ((BAUD_DIVISOR(baud) >> 8) & 0xff)); in nlm_uart_set_baudrate()
155 nlm_uart_init(uint64_t base, int baud, int databits, int stopbits, in nlm_uart_init() argument
181 nlm_uart_set_baudrate(base, baud); in nlm_uart_init()
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| /kernel/linux/linux-6.6/drivers/tty/serial/8250/ |
| D | 8250_mtk.c | 316 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()
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