linux/drivers/tty/serial/clps711x.c
Greg Kroah-Hartman 4793f2ebff tty: serial: Remove redundant license text
Now that the SPDX tag is in all tty files, that identifies the license
in a specific and legally-defined manner.  So the extra GPL text wording
can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Cc: Jiri Slaby <jslaby@suse.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Joachim Eastwood <manabian@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Tobias Klauser <tklauser@distanz.ch>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Richard Genoud <richard.genoud@gmail.com>
Cc: Alexander Shiyan <shc_work@mail.ru>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Pat Gefre <pfg@sgi.com>
Cc: "Guilherme G. Piccoli" <gpiccoli@linux.vnet.ibm.com>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: Sylvain Lemieux <slemieux.tyco@gmail.com>
Cc: Carlo Caione <carlo@caione.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: David Brown <david.brown@linaro.org>
Cc: "Andreas Färber" <afaerber@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Peter Korsgaard <jacmet@sunsite.dk>
Cc: Timur Tabi <timur@tabi.org>
Cc: Tony Prisk <linux@prisktech.co.nz>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-08 13:08:12 +01:00

579 lines
14 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for CLPS711x serial ports
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
*
* Copyright 1999 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd.
*/
#if defined(CONFIG_SERIAL_CLPS711X_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/device.h>
#include <linux/console.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/clps711x.h>
#include "serial_mctrl_gpio.h"
#define UART_CLPS711X_DEVNAME "ttyCL"
#define UART_CLPS711X_NR 2
#define UART_CLPS711X_MAJOR 204
#define UART_CLPS711X_MINOR 40
#define UARTDR_OFFSET (0x00)
#define UBRLCR_OFFSET (0x40)
#define UARTDR_FRMERR (1 << 8)
#define UARTDR_PARERR (1 << 9)
#define UARTDR_OVERR (1 << 10)
#define UBRLCR_BAUD_MASK ((1 << 12) - 1)
#define UBRLCR_BREAK (1 << 12)
#define UBRLCR_PRTEN (1 << 13)
#define UBRLCR_EVENPRT (1 << 14)
#define UBRLCR_XSTOP (1 << 15)
#define UBRLCR_FIFOEN (1 << 16)
#define UBRLCR_WRDLEN5 (0 << 17)
#define UBRLCR_WRDLEN6 (1 << 17)
#define UBRLCR_WRDLEN7 (2 << 17)
#define UBRLCR_WRDLEN8 (3 << 17)
#define UBRLCR_WRDLEN_MASK (3 << 17)
struct clps711x_port {
struct uart_port port;
unsigned int tx_enabled;
int rx_irq;
struct regmap *syscon;
struct mctrl_gpios *gpios;
};
static struct uart_driver clps711x_uart = {
.owner = THIS_MODULE,
.driver_name = UART_CLPS711X_DEVNAME,
.dev_name = UART_CLPS711X_DEVNAME,
.major = UART_CLPS711X_MAJOR,
.minor = UART_CLPS711X_MINOR,
.nr = UART_CLPS711X_NR,
};
static void uart_clps711x_stop_tx(struct uart_port *port)
{
struct clps711x_port *s = dev_get_drvdata(port->dev);
if (s->tx_enabled) {
disable_irq(port->irq);
s->tx_enabled = 0;
}
}
static void uart_clps711x_start_tx(struct uart_port *port)
{
struct clps711x_port *s = dev_get_drvdata(port->dev);
if (!s->tx_enabled) {
s->tx_enabled = 1;
enable_irq(port->irq);
}
}
static irqreturn_t uart_clps711x_int_rx(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
struct clps711x_port *s = dev_get_drvdata(port->dev);
unsigned int status, flg;
u16 ch;
for (;;) {
u32 sysflg = 0;
regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
if (sysflg & SYSFLG_URXFE)
break;
ch = readw(port->membase + UARTDR_OFFSET);
status = ch & (UARTDR_FRMERR | UARTDR_PARERR | UARTDR_OVERR);
ch &= 0xff;
port->icount.rx++;
flg = TTY_NORMAL;
if (unlikely(status)) {
if (status & UARTDR_PARERR)
port->icount.parity++;
else if (status & UARTDR_FRMERR)
port->icount.frame++;
else if (status & UARTDR_OVERR)
port->icount.overrun++;
status &= port->read_status_mask;
if (status & UARTDR_PARERR)
flg = TTY_PARITY;
else if (status & UARTDR_FRMERR)
flg = TTY_FRAME;
else if (status & UARTDR_OVERR)
flg = TTY_OVERRUN;
}
if (uart_handle_sysrq_char(port, ch))
continue;
if (status & port->ignore_status_mask)
continue;
uart_insert_char(port, status, UARTDR_OVERR, ch, flg);
}
tty_flip_buffer_push(&port->state->port);
return IRQ_HANDLED;
}
static irqreturn_t uart_clps711x_int_tx(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
struct clps711x_port *s = dev_get_drvdata(port->dev);
struct circ_buf *xmit = &port->state->xmit;
if (port->x_char) {
writew(port->x_char, port->membase + UARTDR_OFFSET);
port->icount.tx++;
port->x_char = 0;
return IRQ_HANDLED;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
if (s->tx_enabled) {
disable_irq_nosync(port->irq);
s->tx_enabled = 0;
}
return IRQ_HANDLED;
}
while (!uart_circ_empty(xmit)) {
u32 sysflg = 0;
writew(xmit->buf[xmit->tail], port->membase + UARTDR_OFFSET);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
if (sysflg & SYSFLG_UTXFF)
break;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
return IRQ_HANDLED;
}
static unsigned int uart_clps711x_tx_empty(struct uart_port *port)
{
struct clps711x_port *s = dev_get_drvdata(port->dev);
u32 sysflg = 0;
regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
return (sysflg & SYSFLG_UBUSY) ? 0 : TIOCSER_TEMT;
}
static unsigned int uart_clps711x_get_mctrl(struct uart_port *port)
{
unsigned int result = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
struct clps711x_port *s = dev_get_drvdata(port->dev);
return mctrl_gpio_get(s->gpios, &result);
}
static void uart_clps711x_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct clps711x_port *s = dev_get_drvdata(port->dev);
mctrl_gpio_set(s->gpios, mctrl);
}
static void uart_clps711x_break_ctl(struct uart_port *port, int break_state)
{
unsigned int ubrlcr;
ubrlcr = readl(port->membase + UBRLCR_OFFSET);
if (break_state)
ubrlcr |= UBRLCR_BREAK;
else
ubrlcr &= ~UBRLCR_BREAK;
writel(ubrlcr, port->membase + UBRLCR_OFFSET);
}
static void uart_clps711x_set_ldisc(struct uart_port *port,
struct ktermios *termios)
{
if (!port->line) {
struct clps711x_port *s = dev_get_drvdata(port->dev);
regmap_update_bits(s->syscon, SYSCON_OFFSET, SYSCON1_SIREN,
(termios->c_line == N_IRDA) ? SYSCON1_SIREN : 0);
}
}
static int uart_clps711x_startup(struct uart_port *port)
{
struct clps711x_port *s = dev_get_drvdata(port->dev);
/* Disable break */
writel(readl(port->membase + UBRLCR_OFFSET) & ~UBRLCR_BREAK,
port->membase + UBRLCR_OFFSET);
/* Enable the port */
return regmap_update_bits(s->syscon, SYSCON_OFFSET,
SYSCON_UARTEN, SYSCON_UARTEN);
}
static void uart_clps711x_shutdown(struct uart_port *port)
{
struct clps711x_port *s = dev_get_drvdata(port->dev);
/* Disable the port */
regmap_update_bits(s->syscon, SYSCON_OFFSET, SYSCON_UARTEN, 0);
}
static void uart_clps711x_set_termios(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
{
u32 ubrlcr;
unsigned int baud, quot;
/* Mask termios capabilities we don't support */
termios->c_cflag &= ~CMSPAR;
termios->c_iflag &= ~(BRKINT | IGNBRK);
/* Ask the core to calculate the divisor for us */
baud = uart_get_baud_rate(port, termios, old, port->uartclk / 4096,
port->uartclk / 16);
quot = uart_get_divisor(port, baud);
switch (termios->c_cflag & CSIZE) {
case CS5:
ubrlcr = UBRLCR_WRDLEN5;
break;
case CS6:
ubrlcr = UBRLCR_WRDLEN6;
break;
case CS7:
ubrlcr = UBRLCR_WRDLEN7;
break;
case CS8:
default:
ubrlcr = UBRLCR_WRDLEN8;
break;
}
if (termios->c_cflag & CSTOPB)
ubrlcr |= UBRLCR_XSTOP;
if (termios->c_cflag & PARENB) {
ubrlcr |= UBRLCR_PRTEN;
if (!(termios->c_cflag & PARODD))
ubrlcr |= UBRLCR_EVENPRT;
}
/* Enable FIFO */
ubrlcr |= UBRLCR_FIFOEN;
/* Set read status mask */
port->read_status_mask = UARTDR_OVERR;
if (termios->c_iflag & INPCK)
port->read_status_mask |= UARTDR_PARERR | UARTDR_FRMERR;
/* Set status ignore mask */
port->ignore_status_mask = 0;
if (!(termios->c_cflag & CREAD))
port->ignore_status_mask |= UARTDR_OVERR | UARTDR_PARERR |
UARTDR_FRMERR;
uart_update_timeout(port, termios->c_cflag, baud);
writel(ubrlcr | (quot - 1), port->membase + UBRLCR_OFFSET);
}
static const char *uart_clps711x_type(struct uart_port *port)
{
return (port->type == PORT_CLPS711X) ? "CLPS711X" : NULL;
}
static void uart_clps711x_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE)
port->type = PORT_CLPS711X;
}
static void uart_clps711x_nop_void(struct uart_port *port)
{
}
static int uart_clps711x_nop_int(struct uart_port *port)
{
return 0;
}
static const struct uart_ops uart_clps711x_ops = {
.tx_empty = uart_clps711x_tx_empty,
.set_mctrl = uart_clps711x_set_mctrl,
.get_mctrl = uart_clps711x_get_mctrl,
.stop_tx = uart_clps711x_stop_tx,
.start_tx = uart_clps711x_start_tx,
.stop_rx = uart_clps711x_nop_void,
.break_ctl = uart_clps711x_break_ctl,
.set_ldisc = uart_clps711x_set_ldisc,
.startup = uart_clps711x_startup,
.shutdown = uart_clps711x_shutdown,
.set_termios = uart_clps711x_set_termios,
.type = uart_clps711x_type,
.config_port = uart_clps711x_config_port,
.release_port = uart_clps711x_nop_void,
.request_port = uart_clps711x_nop_int,
};
#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
static void uart_clps711x_console_putchar(struct uart_port *port, int ch)
{
struct clps711x_port *s = dev_get_drvdata(port->dev);
u32 sysflg = 0;
/* Wait for FIFO is not full */
do {
regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
} while (sysflg & SYSFLG_UTXFF);
writew(ch, port->membase + UARTDR_OFFSET);
}
static void uart_clps711x_console_write(struct console *co, const char *c,
unsigned n)
{
struct uart_port *port = clps711x_uart.state[co->index].uart_port;
struct clps711x_port *s = dev_get_drvdata(port->dev);
u32 sysflg = 0;
uart_console_write(port, c, n, uart_clps711x_console_putchar);
/* Wait for transmitter to become empty */
do {
regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
} while (sysflg & SYSFLG_UBUSY);
}
static int uart_clps711x_console_setup(struct console *co, char *options)
{
int baud = 38400, bits = 8, parity = 'n', flow = 'n';
int ret, index = co->index;
struct clps711x_port *s;
struct uart_port *port;
unsigned int quot;
u32 ubrlcr;
if (index < 0 || index >= UART_CLPS711X_NR)
return -EINVAL;
port = clps711x_uart.state[index].uart_port;
if (!port)
return -ENODEV;
s = dev_get_drvdata(port->dev);
if (!options) {
u32 syscon = 0;
regmap_read(s->syscon, SYSCON_OFFSET, &syscon);
if (syscon & SYSCON_UARTEN) {
ubrlcr = readl(port->membase + UBRLCR_OFFSET);
if (ubrlcr & UBRLCR_PRTEN) {
if (ubrlcr & UBRLCR_EVENPRT)
parity = 'e';
else
parity = 'o';
}
if ((ubrlcr & UBRLCR_WRDLEN_MASK) == UBRLCR_WRDLEN7)
bits = 7;
quot = ubrlcr & UBRLCR_BAUD_MASK;
baud = port->uartclk / (16 * (quot + 1));
}
} else
uart_parse_options(options, &baud, &parity, &bits, &flow);
ret = uart_set_options(port, co, baud, parity, bits, flow);
if (ret)
return ret;
return regmap_update_bits(s->syscon, SYSCON_OFFSET,
SYSCON_UARTEN, SYSCON_UARTEN);
}
static struct console clps711x_console = {
.name = UART_CLPS711X_DEVNAME,
.device = uart_console_device,
.write = uart_clps711x_console_write,
.setup = uart_clps711x_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
#endif
static int uart_clps711x_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int ret, index = np ? of_alias_get_id(np, "serial") : pdev->id;
struct clps711x_port *s;
struct resource *res;
struct clk *uart_clk;
int irq;
if (index < 0 || index >= UART_CLPS711X_NR)
return -EINVAL;
s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
if (!s)
return -ENOMEM;
uart_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(uart_clk))
return PTR_ERR(uart_clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
s->port.membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(s->port.membase))
return PTR_ERR(s->port.membase);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
s->port.irq = irq;
s->rx_irq = platform_get_irq(pdev, 1);
if (s->rx_irq < 0)
return s->rx_irq;
if (!np) {
char syscon_name[9];
sprintf(syscon_name, "syscon.%i", index + 1);
s->syscon = syscon_regmap_lookup_by_pdevname(syscon_name);
if (IS_ERR(s->syscon))
return PTR_ERR(s->syscon);
} else {
s->syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
if (IS_ERR(s->syscon))
return PTR_ERR(s->syscon);
}
s->port.line = index;
s->port.dev = &pdev->dev;
s->port.iotype = UPIO_MEM32;
s->port.mapbase = res->start;
s->port.type = PORT_CLPS711X;
s->port.fifosize = 16;
s->port.flags = UPF_SKIP_TEST | UPF_FIXED_TYPE;
s->port.uartclk = clk_get_rate(uart_clk);
s->port.ops = &uart_clps711x_ops;
platform_set_drvdata(pdev, s);
s->gpios = mctrl_gpio_init_noauto(&pdev->dev, 0);
if (IS_ERR(s->gpios))
return PTR_ERR(s->gpios);
ret = uart_add_one_port(&clps711x_uart, &s->port);
if (ret)
return ret;
/* Disable port */
if (!uart_console(&s->port))
regmap_update_bits(s->syscon, SYSCON_OFFSET, SYSCON_UARTEN, 0);
s->tx_enabled = 1;
ret = devm_request_irq(&pdev->dev, s->port.irq, uart_clps711x_int_tx, 0,
dev_name(&pdev->dev), &s->port);
if (ret) {
uart_remove_one_port(&clps711x_uart, &s->port);
return ret;
}
ret = devm_request_irq(&pdev->dev, s->rx_irq, uart_clps711x_int_rx, 0,
dev_name(&pdev->dev), &s->port);
if (ret)
uart_remove_one_port(&clps711x_uart, &s->port);
return ret;
}
static int uart_clps711x_remove(struct platform_device *pdev)
{
struct clps711x_port *s = platform_get_drvdata(pdev);
return uart_remove_one_port(&clps711x_uart, &s->port);
}
static const struct of_device_id __maybe_unused clps711x_uart_dt_ids[] = {
{ .compatible = "cirrus,ep7209-uart", },
{ }
};
MODULE_DEVICE_TABLE(of, clps711x_uart_dt_ids);
static struct platform_driver clps711x_uart_platform = {
.driver = {
.name = "clps711x-uart",
.of_match_table = of_match_ptr(clps711x_uart_dt_ids),
},
.probe = uart_clps711x_probe,
.remove = uart_clps711x_remove,
};
static int __init uart_clps711x_init(void)
{
int ret;
#ifdef CONFIG_SERIAL_CLPS711X_CONSOLE
clps711x_uart.cons = &clps711x_console;
clps711x_console.data = &clps711x_uart;
#endif
ret = uart_register_driver(&clps711x_uart);
if (ret)
return ret;
return platform_driver_register(&clps711x_uart_platform);
}
module_init(uart_clps711x_init);
static void __exit uart_clps711x_exit(void)
{
platform_driver_unregister(&clps711x_uart_platform);
uart_unregister_driver(&clps711x_uart);
}
module_exit(uart_clps711x_exit);
MODULE_AUTHOR("Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("CLPS711X serial driver");
MODULE_LICENSE("GPL");