diff options
author | Soren Brinkmann <soren.brinkmann@xilinx.com> | 2014-04-04 17:23:39 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-24 16:21:50 -0700 |
commit | e555a21149806b21ae63ba0b02d42ce100db5639 (patch) | |
tree | 858b6305b469ea2be5c102a4b1d804dd9f536f76 /drivers/tty/serial | |
parent | 928e9263492069eeebb4c867b841508837895e0e (diff) |
tty: xuartps: Clean up
This is all white space and comment clean up. Mostly reformatting
comments.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 210 |
1 files changed, 74 insertions, 136 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 2cd0cd456c7a..787a12064fa0 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1,14 +1,13 @@ /* * Xilinx PS UART driver * - * 2011 - 2013 (C) Xilinx Inc. + * 2011 - 2014 (C) Xilinx Inc. * * This program is free software; you can redistribute it * and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; * either version 2 of the License, or (at your option) any * later version. - * */ #if defined(CONFIG_SERIAL_XILINX_PS_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) @@ -49,39 +48,27 @@ static int rx_timeout = 10; module_param(rx_timeout, uint, S_IRUGO); MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); -/********************************Register Map********************************/ -/** UART - * - * Register offsets for the UART. - * - */ -#define XUARTPS_CR_OFFSET 0x00 /* Control Register [8:0] */ -#define XUARTPS_MR_OFFSET 0x04 /* Mode Register [10:0] */ -#define XUARTPS_IER_OFFSET 0x08 /* Interrupt Enable [10:0] */ -#define XUARTPS_IDR_OFFSET 0x0C /* Interrupt Disable [10:0] */ -#define XUARTPS_IMR_OFFSET 0x10 /* Interrupt Mask [10:0] */ -#define XUARTPS_ISR_OFFSET 0x14 /* Interrupt Status [10:0]*/ -#define XUARTPS_BAUDGEN_OFFSET 0x18 /* Baud Rate Generator [15:0] */ -#define XUARTPS_RXTOUT_OFFSET 0x1C /* RX Timeout [7:0] */ -#define XUARTPS_RXWM_OFFSET 0x20 /* RX FIFO Trigger Level [5:0] */ -#define XUARTPS_MODEMCR_OFFSET 0x24 /* Modem Control [5:0] */ -#define XUARTPS_MODEMSR_OFFSET 0x28 /* Modem Status [8:0] */ -#define XUARTPS_SR_OFFSET 0x2C /* Channel Status [11:0] */ -#define XUARTPS_FIFO_OFFSET 0x30 /* FIFO [15:0] or [7:0] */ -#define XUARTPS_BAUDDIV_OFFSET 0x34 /* Baud Rate Divider [7:0] */ -#define XUARTPS_FLOWDEL_OFFSET 0x38 /* Flow Delay [15:0] */ -#define XUARTPS_IRRX_PWIDTH_OFFSET 0x3C /* IR Minimum Received Pulse - Width [15:0] */ -#define XUARTPS_IRTX_PWIDTH_OFFSET 0x40 /* IR Transmitted pulse - Width [7:0] */ -#define XUARTPS_TXWM_OFFSET 0x44 /* TX FIFO Trigger Level [5:0] */ - -/** Control Register - * - * The Control register (CR) controls the major functions of the device. - * - * Control Register Bit Definitions - */ +/* Register offsets for the UART. */ +#define XUARTPS_CR_OFFSET 0x00 /* Control Register */ +#define XUARTPS_MR_OFFSET 0x04 /* Mode Register */ +#define XUARTPS_IER_OFFSET 0x08 /* Interrupt Enable */ +#define XUARTPS_IDR_OFFSET 0x0C /* Interrupt Disable */ +#define XUARTPS_IMR_OFFSET 0x10 /* Interrupt Mask */ +#define XUARTPS_ISR_OFFSET 0x14 /* Interrupt Status */ +#define XUARTPS_BAUDGEN_OFFSET 0x18 /* Baud Rate Generator */ +#define XUARTPS_RXTOUT_OFFSET 0x1C /* RX Timeout */ +#define XUARTPS_RXWM_OFFSET 0x20 /* RX FIFO Trigger Level */ +#define XUARTPS_MODEMCR_OFFSET 0x24 /* Modem Control */ +#define XUARTPS_MODEMSR_OFFSET 0x28 /* Modem Status */ +#define XUARTPS_SR_OFFSET 0x2C /* Channel Status */ +#define XUARTPS_FIFO_OFFSET 0x30 /* FIFO */ +#define XUARTPS_BAUDDIV_OFFSET 0x34 /* Baud Rate Divider */ +#define XUARTPS_FLOWDEL_OFFSET 0x38 /* Flow Delay */ +#define XUARTPS_IRRX_PWIDTH_OFFSET 0x3C /* IR Minimum Received Pulse Width */ +#define XUARTPS_IRTX_PWIDTH_OFFSET 0x40 /* IR Transmitted pulse Width */ +#define XUARTPS_TXWM_OFFSET 0x44 /* TX FIFO Trigger Level */ + +/* Control Register Bit Definitions */ #define XUARTPS_CR_STOPBRK 0x00000100 /* Stop TX break */ #define XUARTPS_CR_STARTBRK 0x00000080 /* Set TX break */ #define XUARTPS_CR_TX_DIS 0x00000020 /* TX disabled. */ @@ -92,14 +79,11 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); #define XUARTPS_CR_RXRST 0x00000001 /* RX logic reset */ #define XUARTPS_CR_RST_TO 0x00000040 /* Restart Timeout Counter */ -/** Mode Register - * +/* + * Mode Register: * The mode register (MR) defines the mode of transfer as well as the data * format. If this register is modified during transmission or reception, * data validity cannot be guaranteed. - * - * Mode Register Bit Definitions - * */ #define XUARTPS_MR_CLKSEL 0x00000001 /* Pre-scalar selection */ #define XUARTPS_MR_CHMODE_L_LOOP 0x00000200 /* Local loop back mode */ @@ -118,8 +102,8 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); #define XUARTPS_MR_CHARLEN_7_BIT 0x00000004 /* 7 bits data */ #define XUARTPS_MR_CHARLEN_8_BIT 0x00000000 /* 8 bits data */ -/** Interrupt Registers - * +/* + * Interrupt Registers: * Interrupt control logic uses the interrupt enable register (IER) and the * interrupt disable register (IDR) to set the value of the bits in the * interrupt mask register (IMR). The IMR determines whether to pass an @@ -127,7 +111,6 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); * Writing a 1 to IER Enables an interrupt, writing a 1 to IDR disables an * interrupt. IMR and ISR are read only, and IER and IDR are write only. * Reading either IER or IDR returns 0x00. - * * All four registers have the same bit definitions. */ #define XUARTPS_IXR_TOUT 0x00000100 /* RX Timeout error interrupt */ @@ -145,8 +128,8 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); /* Goes in read_status_mask for break detection as the HW doesn't do it*/ #define XUARTPS_IXR_BRK 0x80000000 -/** Channel Status Register - * +/* + * Channel Status Register: * The channel status register (CSR) is provided to enable the control logic * to monitor the status of bits in the channel interrupt status register, * even if these are masked out by the interrupt mask register. @@ -205,7 +188,6 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id) * error with all-zeros data as a break sequence. Most of the time, * there's another non-zero byte at the end of the sequence. */ - if (isrstatus & XUARTPS_IXR_FRAMING) { while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_RXEMPTY)) { @@ -264,8 +246,9 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id) } else if (isrstatus & XUARTPS_IXR_FRAMING) { port->icount.frame++; status = TTY_FRAME; - } else if (isrstatus & XUARTPS_IXR_OVERRUN) + } else if (isrstatus & XUARTPS_IXR_OVERRUN) { port->icount.overrun++; + } uart_insert_char(port, isrstatus, XUARTPS_IXR_OVERRUN, data, status); @@ -300,7 +283,7 @@ static irqreturn_t xuartps_isr(int irq, void *dev_id) * the buffer if it reaches limit. */ port->state->xmit.tail = - (port->state->xmit.tail + 1) & \ + (port->state->xmit.tail + 1) & (UART_XMIT_SIZE - 1); } @@ -419,7 +402,7 @@ static unsigned int xuartps_set_baud_rate(struct uart_port *port, * @nb: Notifier block * @event: Notify event * @data: Notifier data - * Return: NOTIFY_OK on success, NOTIFY_BAD on error. + * Return: NOTIFY_OK or NOTIFY_DONE on success, NOTIFY_BAD on error. */ static int xuartps_clk_notifier_cb(struct notifier_block *nb, unsigned long event, void *data) @@ -438,8 +421,7 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb, switch (event) { case PRE_RATE_CHANGE: { - u32 bdiv; - u32 cd; + u32 bdiv, cd; int div8; /* @@ -509,8 +491,6 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb, } #endif -/*----------------------Uart Operations---------------------------*/ - /** * xuartps_start_tx - Start transmitting bytes * @port: Handle to the uart port structure @@ -529,9 +509,8 @@ static void xuartps_start_tx(struct uart_port *port) xuartps_writel((status & ~XUARTPS_CR_TX_DIS) | XUARTPS_CR_TX_EN, XUARTPS_CR_OFFSET); - while (numbytes-- && ((xuartps_readl(XUARTPS_SR_OFFSET) - & XUARTPS_SR_TXFULL)) != XUARTPS_SR_TXFULL) { - + while (numbytes-- && ((xuartps_readl(XUARTPS_SR_OFFSET) & + XUARTPS_SR_TXFULL)) != XUARTPS_SR_TXFULL) { /* Break if no more data available in the UART buffer */ if (uart_circ_empty(&port->state->xmit)) break; @@ -666,9 +645,7 @@ static void xuartps_set_termios(struct uart_port *port, if (tty_termios_baud_rate(termios)) tty_termios_encode_baud_rate(termios, baud, baud); - /* - * Update the per-port timeout. - */ + /* Update the per-port timeout. */ uart_update_timeout(port, termios->c_cflag, baud); /* Set TX/RX Reset */ @@ -678,7 +655,8 @@ static void xuartps_set_termios(struct uart_port *port, ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET); - /* Clear the RX disable and TX disable bits and then set the TX enable + /* + * Clear the RX disable and TX disable bits and then set the TX enable * bit and RX enable bit to enable the transmitter and receiver. */ xuartps_writel( @@ -756,7 +734,7 @@ static void xuartps_set_termios(struct uart_port *port, * xuartps_startup - Called when an application opens a xuartps port * @port: Handle to the uart port structure * - * Return: 0 on success, negative error otherwise + * Return: 0 on success, negative errno otherwise */ static int xuartps_startup(struct uart_port *port) { @@ -850,7 +828,7 @@ static const char *xuartps_type(struct uart_port *port) * @port: Handle to the uart port structure * @ser: Handle to the structure whose members are compared * - * Return: 0 if success otherwise -EINVAL + * Return: 0 on success, negative errno otherwise. */ static int xuartps_verify_port(struct uart_port *port, struct serial_struct *ser) @@ -874,7 +852,7 @@ static int xuartps_verify_port(struct uart_port *port, * uart_add_one_port() * @port: Handle to the uart port structure * - * Return: 0, -ENOMEM if request fails + * Return: 0 on success, negative errno otherwise. */ static int xuartps_request_port(struct uart_port *port) { @@ -893,10 +871,11 @@ static int xuartps_request_port(struct uart_port *port) } /** - * xuartps_release_port - Release the memory region attached to a xuartps - * port, called when the driver removes a xuartps - * port via uart_remove_one_port(). + * xuartps_release_port - Release UART port * @port: Handle to the uart port structure + * + * Release the memory region attached to a xuartps port. Called when the + * driver removes a xuartps port via uart_remove_one_port(). */ static void xuartps_release_port(struct uart_port *port) { @@ -906,8 +885,7 @@ static void xuartps_release_port(struct uart_port *port) } /** - * xuartps_config_port - Configure xuartps, called when the driver adds a - * xuartps port + * xuartps_config_port - Configure UART port * @port: Handle to the uart port structure * @flags: If any */ @@ -919,7 +897,6 @@ static void xuartps_config_port(struct uart_port *port, int flags) /** * xuartps_get_mctrl - Get the modem control state - * * @port: Handle to the uart port structure * * Return: the modem control state @@ -987,38 +964,23 @@ static void xuartps_poll_put_char(struct uart_port *port, unsigned char c) } #endif -/** The UART operations structure - */ static struct uart_ops xuartps_ops = { .set_mctrl = xuartps_set_mctrl, .get_mctrl = xuartps_get_mctrl, .enable_ms = xuartps_enable_ms, - - .start_tx = xuartps_start_tx, /* Start transmitting */ - .stop_tx = xuartps_stop_tx, /* Stop transmission */ - .stop_rx = xuartps_stop_rx, /* Stop reception */ - .tx_empty = xuartps_tx_empty, /* Transmitter busy? */ - .break_ctl = xuartps_break_ctl, /* Start/stop - * transmitting break - */ - .set_termios = xuartps_set_termios, /* Set termios */ - .startup = xuartps_startup, /* App opens xuartps */ - .shutdown = xuartps_shutdown, /* App closes xuartps */ - .type = xuartps_type, /* Set UART type */ - .verify_port = xuartps_verify_port, /* Verification of port - * params - */ - .request_port = xuartps_request_port, /* Claim resources - * associated with a - * xuartps port - */ - .release_port = xuartps_release_port, /* Release resources - * associated with a - * xuartps port - */ - .config_port = xuartps_config_port, /* Configure when driver - * adds a xuartps port - */ + .start_tx = xuartps_start_tx, + .stop_tx = xuartps_stop_tx, + .stop_rx = xuartps_stop_rx, + .tx_empty = xuartps_tx_empty, + .break_ctl = xuartps_break_ctl, + .set_termios = xuartps_set_termios, + .startup = xuartps_startup, + .shutdown = xuartps_shutdown, + .type = xuartps_type, + .verify_port = xuartps_verify_port, + .request_port = xuartps_request_port, + .release_port = xuartps_release_port, + .config_port = xuartps_config_port, #ifdef CONFIG_CONSOLE_POLL .poll_get_char = xuartps_poll_get_char, .poll_put_char = xuartps_poll_put_char, @@ -1028,9 +990,7 @@ static struct uart_ops xuartps_ops = { static struct uart_port xuartps_port[2]; /** - * xuartps_get_port - Configure the port from the platform device resource - * info - * + * xuartps_get_port - Configure the port from the platform device resource info * @id: Port id * * Return: a pointer to a uart_port or NULL for failure @@ -1067,8 +1027,6 @@ static struct uart_port *xuartps_get_port(int id) return port; } -/*-----------------------Console driver operations--------------------------*/ - #ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE /** * xuartps_console_wait_tx - Wait for the TX to be full @@ -1144,7 +1102,7 @@ static void xuartps_console_write(struct console *co, const char *s, * @co: Console handle * @options: Initial settings of uart * - * Return: 0, -ENODEV if no device + * Return: 0 on success, negative errno otherwise. */ static int __init xuartps_console_setup(struct console *co, char *options) { @@ -1183,7 +1141,7 @@ static struct console xuartps_console = { /** * xuartps_console_init - Initialization call * - * Return: 0 on success, negative error otherwise + * Return: 0 on success, negative errno otherwise */ static int __init xuartps_console_init(void) { @@ -1195,17 +1153,15 @@ console_initcall(xuartps_console_init); #endif /* CONFIG_SERIAL_XILINX_PS_UART_CONSOLE */ -/** Structure Definitions - */ static struct uart_driver xuartps_uart_driver = { - .owner = THIS_MODULE, /* Owner */ - .driver_name = XUARTPS_NAME, /* Driver name */ - .dev_name = XUARTPS_TTY_NAME, /* Node name */ - .major = XUARTPS_MAJOR, /* Major number */ - .minor = XUARTPS_MINOR, /* Minor number */ - .nr = XUARTPS_NR_PORTS, /* Number of UART ports */ + .owner = THIS_MODULE, + .driver_name = XUARTPS_NAME, + .dev_name = XUARTPS_TTY_NAME, + .major = XUARTPS_MAJOR, + .minor = XUARTPS_MINOR, + .nr = XUARTPS_NR_PORTS, #ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE - .cons = &xuartps_console, /* Console */ + .cons = &xuartps_console, #endif }; @@ -1322,14 +1278,11 @@ static int xuartps_resume(struct device *device) static SIMPLE_DEV_PM_OPS(xuartps_dev_pm_ops, xuartps_suspend, xuartps_resume); -/* --------------------------------------------------------------------- - * Platform bus binding - */ /** * xuartps_probe - Platform driver probe * @pdev: Pointer to the platform device structure * - * Return: 0 on success, negative error otherwise + * Return: 0 on success, negative errno otherwise */ static int xuartps_probe(struct platform_device *pdev) { @@ -1434,7 +1387,7 @@ err_out_clk_dis_aper: * xuartps_remove - called when the platform driver is unregistered * @pdev: Pointer to the platform device structure * - * Return: 0 on success, negative error otherwise + * Return: 0 on success, negative errno otherwise */ static int xuartps_remove(struct platform_device *pdev) { @@ -1462,24 +1415,16 @@ static struct of_device_id xuartps_of_match[] = { MODULE_DEVICE_TABLE(of, xuartps_of_match); static struct platform_driver xuartps_platform_driver = { - .probe = xuartps_probe, /* Probe method */ - .remove = xuartps_remove, /* Detach method */ + .probe = xuartps_probe, + .remove = xuartps_remove, .driver = { .owner = THIS_MODULE, - .name = XUARTPS_NAME, /* Driver name */ + .name = XUARTPS_NAME, .of_match_table = xuartps_of_match, .pm = &xuartps_dev_pm_ops, }, }; -/* --------------------------------------------------------------------- - * Module Init and Exit - */ -/** - * xuartps_init - Initial driver registration call - * - * Return: whether the registration was successful or not - */ static int __init xuartps_init(void) { int retval = 0; @@ -1497,15 +1442,8 @@ static int __init xuartps_init(void) return retval; } -/** - * xuartps_exit - Driver unregistration call - */ static void __exit xuartps_exit(void) { - /* The order of unregistration is important. Unregister the - * UART driver before the platform driver crashes the system. - */ - /* Unregister the platform driver */ platform_driver_unregister(&xuartps_platform_driver); |