linux_dsm_epyc7002/drivers/tty/serial/dz.c

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tty: add SPDX identifiers to all remaining files in drivers/tty/ It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the drivers/tty files files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Jiri Slaby <jslaby@suse.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: David Sterba <dsterba@suse.com> Cc: James Hogan <jhogan@kernel.org> Cc: Rob Herring <robh@kernel.org> 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: "Maciej W. Rozycki" <macro@linux-mips.org> Cc: "Uwe Kleine-König" <kernel@pengutronix.de> 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: 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: "David S. Miller" <davem@davemloft.net> 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> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Jiri Slaby <jslaby@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-07 00:11:51 +07:00
// SPDX-License-Identifier: GPL-2.0
/*
* dz.c: Serial port driver for DECstations equipped
* with the DZ chipset.
*
* Copyright (C) 1998 Olivier A. D. Lebaillif
*
* Email: olivier.lebaillif@ifrsys.com
*
* Copyright (C) 2004, 2006, 2007 Maciej W. Rozycki
*
* [31-AUG-98] triemer
* Changed IRQ to use Harald's dec internals interrupts.h
* removed base_addr code - moving address assignment to setup.c
* Changed name of dz_init to rs_init to be consistent with tc code
* [13-NOV-98] triemer fixed code to receive characters
* after patches by harald to irq code.
* [09-JAN-99] triemer minor fix for schedule - due to removal of timeout
* field from "current" - somewhere between 2.1.121 and 2.1.131
Qua Jun 27 15:02:26 BRT 2001
* [27-JUN-2001] Arnaldo Carvalho de Melo <acme@conectiva.com.br> - cleanups
*
* Parts (C) 1999 David Airlie, airlied@linux.ie
* [07-SEP-99] Bugfixes
*
* [06-Jan-2002] Russell King <rmk@arm.linux.org.uk>
* Converted to new serial core
*/
#undef DEBUG_DZ
#if defined(CONFIG_SERIAL_DZ_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/sysrq.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/atomic.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/dec/interrupts.h>
#include <asm/dec/kn01.h>
#include <asm/dec/kn02.h>
#include <asm/dec/machtype.h>
#include <asm/dec/prom.h>
#include <asm/dec/system.h>
#include "dz.h"
MODULE_DESCRIPTION("DECstation DZ serial driver");
MODULE_LICENSE("GPL");
static char dz_name[] __initdata = "DECstation DZ serial driver version ";
static char dz_version[] __initdata = "1.04";
struct dz_port {
struct dz_mux *mux;
struct uart_port port;
unsigned int cflag;
};
struct dz_mux {
struct dz_port dport[DZ_NB_PORT];
atomic_t map_guard;
atomic_t irq_guard;
int initialised;
};
static struct dz_mux dz_mux;
static inline struct dz_port *to_dport(struct uart_port *uport)
{
return container_of(uport, struct dz_port, port);
}
/*
* ------------------------------------------------------------
* dz_in () and dz_out ()
*
* These routines are used to access the registers of the DZ
* chip, hiding relocation differences between implementation.
* ------------------------------------------------------------
*/
static u16 dz_in(struct dz_port *dport, unsigned offset)
{
void __iomem *addr = dport->port.membase + offset;
return readw(addr);
}
static void dz_out(struct dz_port *dport, unsigned offset, u16 value)
{
void __iomem *addr = dport->port.membase + offset;
writew(value, addr);
}
/*
* ------------------------------------------------------------
* rs_stop () and rs_start ()
*
* These routines are called before setting or resetting
* tty->stopped. They enable or disable transmitter interrupts,
* as necessary.
* ------------------------------------------------------------
*/
static void dz_stop_tx(struct uart_port *uport)
{
struct dz_port *dport = to_dport(uport);
u16 tmp, mask = 1 << dport->port.line;
tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
tmp &= ~mask; /* clear the TX flag */
dz_out(dport, DZ_TCR, tmp);
}
static void dz_start_tx(struct uart_port *uport)
{
struct dz_port *dport = to_dport(uport);
u16 tmp, mask = 1 << dport->port.line;
tmp = dz_in(dport, DZ_TCR); /* read the TX flag */
tmp |= mask; /* set the TX flag */
dz_out(dport, DZ_TCR, tmp);
}
static void dz_stop_rx(struct uart_port *uport)
{
struct dz_port *dport = to_dport(uport);
dport->cflag &= ~DZ_RXENAB;
dz_out(dport, DZ_LPR, dport->cflag);
}
/*
* ------------------------------------------------------------
*
* Here start the interrupt handling routines. All of the following
* subroutines are declared as inline and are folded into
* dz_interrupt. They were separated out for readability's sake.
*
* Note: dz_interrupt() is a "fast" interrupt, which means that it
* runs with interrupts turned off. People who may want to modify
* dz_interrupt() should try to keep the interrupt handler as fast as
* possible. After you are done making modifications, it is not a bad
* idea to do:
*
* make drivers/serial/dz.s
*
* and look at the resulting assemble code in dz.s.
*
* ------------------------------------------------------------
*/
/*
* ------------------------------------------------------------
* receive_char ()
*
* This routine deals with inputs from any lines.
* ------------------------------------------------------------
*/
static inline void dz_receive_chars(struct dz_mux *mux)
{
struct uart_port *uport;
struct dz_port *dport = &mux->dport[0];
struct uart_icount *icount;
int lines_rx[DZ_NB_PORT] = { [0 ... DZ_NB_PORT - 1] = 0 };
unsigned char ch, flag;
u16 status;
int i;
while ((status = dz_in(dport, DZ_RBUF)) & DZ_DVAL) {
dport = &mux->dport[LINE(status)];
uport = &dport->port;
ch = UCHAR(status); /* grab the char */
flag = TTY_NORMAL;
icount = &uport->icount;
icount->rx++;
if (unlikely(status & (DZ_OERR | DZ_FERR | DZ_PERR))) {
/*
* There is no separate BREAK status bit, so treat
* null characters with framing errors as BREAKs;
* normally, otherwise. For this move the Framing
* Error bit to a simulated BREAK bit.
*/
if (!ch) {
status |= (status & DZ_FERR) >>
(ffs(DZ_FERR) - ffs(DZ_BREAK));
status &= ~DZ_FERR;
}
/* Handle SysRq/SAK & keep track of the statistics. */
if (status & DZ_BREAK) {
icount->brk++;
if (uart_handle_break(uport))
continue;
} else if (status & DZ_FERR)
icount->frame++;
else if (status & DZ_PERR)
icount->parity++;
if (status & DZ_OERR)
icount->overrun++;
status &= uport->read_status_mask;
if (status & DZ_BREAK)
flag = TTY_BREAK;
else if (status & DZ_FERR)
flag = TTY_FRAME;
else if (status & DZ_PERR)
flag = TTY_PARITY;
}
if (uart_handle_sysrq_char(uport, ch))
continue;
uart_insert_char(uport, status, DZ_OERR, ch, flag);
lines_rx[LINE(status)] = 1;
}
for (i = 0; i < DZ_NB_PORT; i++)
if (lines_rx[i])
tty_flip_buffer_push(&mux->dport[i].port.state->port);
}
/*
* ------------------------------------------------------------
* transmit_char ()
*
* This routine deals with outputs to any lines.
* ------------------------------------------------------------
*/
static inline void dz_transmit_chars(struct dz_mux *mux)
{
struct dz_port *dport = &mux->dport[0];
struct circ_buf *xmit;
unsigned char tmp;
u16 status;
status = dz_in(dport, DZ_CSR);
dport = &mux->dport[LINE(status)];
xmit = &dport->port.state->xmit;
if (dport->port.x_char) { /* XON/XOFF chars */
dz_out(dport, DZ_TDR, dport->port.x_char);
dport->port.icount.tx++;
dport->port.x_char = 0;
return;
}
/* If nothing to do or stopped or hardware stopped. */
if (uart_circ_empty(xmit) || uart_tx_stopped(&dport->port)) {
spin_lock(&dport->port.lock);
dz_stop_tx(&dport->port);
spin_unlock(&dport->port.lock);
return;
}
/*
* If something to do... (remember the dz has no output fifo,
* so we go one char at a time) :-<
*/
tmp = xmit->buf[xmit->tail];
xmit->tail = (xmit->tail + 1) & (DZ_XMIT_SIZE - 1);
dz_out(dport, DZ_TDR, tmp);
dport->port.icount.tx++;
if (uart_circ_chars_pending(xmit) < DZ_WAKEUP_CHARS)
uart_write_wakeup(&dport->port);
/* Are we are done. */
if (uart_circ_empty(xmit)) {
spin_lock(&dport->port.lock);
dz_stop_tx(&dport->port);
spin_unlock(&dport->port.lock);
}
}
/*
* ------------------------------------------------------------
* check_modem_status()
*
* DS 3100 & 5100: Only valid for the MODEM line, duh!
* DS 5000/200: Valid for the MODEM and PRINTER line.
* ------------------------------------------------------------
*/
static inline void check_modem_status(struct dz_port *dport)
{
/*
* FIXME:
* 1. No status change interrupt; use a timer.
* 2. Handle the 3100/5000 as appropriate. --macro
*/
u16 status;
/* If not the modem line just return. */
if (dport->port.line != DZ_MODEM)
return;
status = dz_in(dport, DZ_MSR);
/* it's easy, since DSR2 is the only bit in the register */
if (status)
dport->port.icount.dsr++;
}
/*
* ------------------------------------------------------------
* dz_interrupt ()
*
* this is the main interrupt routine for the DZ chip.
* It deals with the multiple ports.
* ------------------------------------------------------------
*/
static irqreturn_t dz_interrupt(int irq, void *dev_id)
{
struct dz_mux *mux = dev_id;
struct dz_port *dport = &mux->dport[0];
u16 status;
/* get the reason why we just got an irq */
status = dz_in(dport, DZ_CSR);
if ((status & (DZ_RDONE | DZ_RIE)) == (DZ_RDONE | DZ_RIE))
dz_receive_chars(mux);
if ((status & (DZ_TRDY | DZ_TIE)) == (DZ_TRDY | DZ_TIE))
dz_transmit_chars(mux);
return IRQ_HANDLED;
}
/*
* -------------------------------------------------------------------
* Here ends the DZ interrupt routines.
* -------------------------------------------------------------------
*/
static unsigned int dz_get_mctrl(struct uart_port *uport)
{
/*
* FIXME: Handle the 3100/5000 as appropriate. --macro
*/
struct dz_port *dport = to_dport(uport);
unsigned int mctrl = TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
if (dport->port.line == DZ_MODEM) {
if (dz_in(dport, DZ_MSR) & DZ_MODEM_DSR)
mctrl &= ~TIOCM_DSR;
}
return mctrl;
}
static void dz_set_mctrl(struct uart_port *uport, unsigned int mctrl)
{
/*
* FIXME: Handle the 3100/5000 as appropriate. --macro
*/
struct dz_port *dport = to_dport(uport);
u16 tmp;
if (dport->port.line == DZ_MODEM) {
tmp = dz_in(dport, DZ_TCR);
if (mctrl & TIOCM_DTR)
tmp &= ~DZ_MODEM_DTR;
else
tmp |= DZ_MODEM_DTR;
dz_out(dport, DZ_TCR, tmp);
}
}
/*
* -------------------------------------------------------------------
* startup ()
*
* various initialization tasks
* -------------------------------------------------------------------
*/
static int dz_startup(struct uart_port *uport)
{
struct dz_port *dport = to_dport(uport);
struct dz_mux *mux = dport->mux;
unsigned long flags;
int irq_guard;
int ret;
u16 tmp;
irq_guard = atomic_add_return(1, &mux->irq_guard);
if (irq_guard != 1)
return 0;
ret = request_irq(dport->port.irq, dz_interrupt,
IRQF_SHARED, "dz", mux);
if (ret) {
atomic_add(-1, &mux->irq_guard);
printk(KERN_ERR "dz: Cannot get IRQ %d!\n", dport->port.irq);
return ret;
}
spin_lock_irqsave(&dport->port.lock, flags);
/* Enable interrupts. */
tmp = dz_in(dport, DZ_CSR);
tmp |= DZ_RIE | DZ_TIE;
dz_out(dport, DZ_CSR, tmp);
spin_unlock_irqrestore(&dport->port.lock, flags);
return 0;
}
/*
* -------------------------------------------------------------------
* shutdown ()
*
* This routine will shutdown a serial port; interrupts are disabled, and
* DTR is dropped if the hangup on close termio flag is on.
* -------------------------------------------------------------------
*/
static void dz_shutdown(struct uart_port *uport)
{
struct dz_port *dport = to_dport(uport);
struct dz_mux *mux = dport->mux;
unsigned long flags;
int irq_guard;
u16 tmp;
spin_lock_irqsave(&dport->port.lock, flags);
dz_stop_tx(&dport->port);
spin_unlock_irqrestore(&dport->port.lock, flags);
irq_guard = atomic_add_return(-1, &mux->irq_guard);
if (!irq_guard) {
/* Disable interrupts. */
tmp = dz_in(dport, DZ_CSR);
tmp &= ~(DZ_RIE | DZ_TIE);
dz_out(dport, DZ_CSR, tmp);
free_irq(dport->port.irq, mux);
}
}
/*
* -------------------------------------------------------------------
* dz_tx_empty() -- get the transmitter empty status
*
* Purpose: Let user call ioctl() to get info when the UART physically
* is emptied. On bus types like RS485, the transmitter must
* release the bus after transmitting. This must be done when
* the transmit shift register is empty, not be done when the
* transmit holding register is empty. This functionality
* allows an RS485 driver to be written in user space.
* -------------------------------------------------------------------
*/
static unsigned int dz_tx_empty(struct uart_port *uport)
{
struct dz_port *dport = to_dport(uport);
unsigned short tmp, mask = 1 << dport->port.line;
tmp = dz_in(dport, DZ_TCR);
tmp &= mask;
return tmp ? 0 : TIOCSER_TEMT;
}
static void dz_break_ctl(struct uart_port *uport, int break_state)
{
/*
* FIXME: Can't access BREAK bits in TDR easily;
* reuse the code for polled TX. --macro
*/
struct dz_port *dport = to_dport(uport);
unsigned long flags;
unsigned short tmp, mask = 1 << dport->port.line;
spin_lock_irqsave(&uport->lock, flags);
tmp = dz_in(dport, DZ_TCR);
if (break_state)
tmp |= mask;
else
tmp &= ~mask;
dz_out(dport, DZ_TCR, tmp);
spin_unlock_irqrestore(&uport->lock, flags);
}
static int dz_encode_baud_rate(unsigned int baud)
{
switch (baud) {
case 50:
return DZ_B50;
case 75:
return DZ_B75;
case 110:
return DZ_B110;
case 134:
return DZ_B134;
case 150:
return DZ_B150;
case 300:
return DZ_B300;
case 600:
return DZ_B600;
case 1200:
return DZ_B1200;
case 1800:
return DZ_B1800;
case 2000:
return DZ_B2000;
case 2400:
return DZ_B2400;
case 3600:
return DZ_B3600;
case 4800:
return DZ_B4800;
case 7200:
return DZ_B7200;
case 9600:
return DZ_B9600;
default:
return -1;
}
}
static void dz_reset(struct dz_port *dport)
{
struct dz_mux *mux = dport->mux;
if (mux->initialised)
return;
dz_out(dport, DZ_CSR, DZ_CLR);
while (dz_in(dport, DZ_CSR) & DZ_CLR);
iob();
/* Enable scanning. */
dz_out(dport, DZ_CSR, DZ_MSE);
mux->initialised = 1;
}
static void dz_set_termios(struct uart_port *uport, struct ktermios *termios,
struct ktermios *old_termios)
{
struct dz_port *dport = to_dport(uport);
unsigned long flags;
unsigned int cflag, baud;
int bflag;
cflag = dport->port.line;
switch (termios->c_cflag & CSIZE) {
case CS5:
cflag |= DZ_CS5;
break;
case CS6:
cflag |= DZ_CS6;
break;
case CS7:
cflag |= DZ_CS7;
break;
case CS8:
default:
cflag |= DZ_CS8;
}
if (termios->c_cflag & CSTOPB)
cflag |= DZ_CSTOPB;
if (termios->c_cflag & PARENB)
cflag |= DZ_PARENB;
if (termios->c_cflag & PARODD)
cflag |= DZ_PARODD;
baud = uart_get_baud_rate(uport, termios, old_termios, 50, 9600);
bflag = dz_encode_baud_rate(baud);
if (bflag < 0) { /* Try to keep unchanged. */
baud = uart_get_baud_rate(uport, old_termios, NULL, 50, 9600);
bflag = dz_encode_baud_rate(baud);
if (bflag < 0) { /* Resort to 9600. */
baud = 9600;
bflag = DZ_B9600;
}
tty_termios_encode_baud_rate(termios, baud, baud);
}
cflag |= bflag;
if (termios->c_cflag & CREAD)
cflag |= DZ_RXENAB;
spin_lock_irqsave(&dport->port.lock, flags);
uart_update_timeout(uport, termios->c_cflag, baud);
dz_out(dport, DZ_LPR, cflag);
dport->cflag = cflag;
/* setup accept flag */
dport->port.read_status_mask = DZ_OERR;
if (termios->c_iflag & INPCK)
dport->port.read_status_mask |= DZ_FERR | DZ_PERR;
serial: Fix IGNBRK handling If IGNBRK is set without either BRKINT or PARMRK set, some uart drivers send a 0x00 byte for BREAK without the TTYBREAK flag to the line discipline, when it should send either nothing or the TTYBREAK flag set. This happens because the read_status_mask masks out the BI condition, which uart_insert_char() then interprets as a normal 0x00 byte. SUS v3 is clear regarding the meaning of IGNBRK; Section 11.2.2, General Terminal Interface - Input Modes, states: "If IGNBRK is set, a break condition detected on input shall be ignored; that is, not put on the input queue and therefore not read by any process." Fix read_status_mask to include the BI bit if IGNBRK is set; the lsr status retains the BI bit if a BREAK is recv'd, which is subsequently ignored in uart_insert_char() when masked with the ignore_status_mask. Affected drivers: 8250 - all serial_txx9 mfd amba-pl010 amba-pl011 atmel_serial bfin_uart dz ip22zilog max310x mxs-auart netx-serial pnx8xxx_uart pxa sb1250-duart sccnxp serial_ks8695 sirfsoc_uart st-asc vr41xx_siu zs sunzilog fsl_lpuart sunsab ucc_uart bcm63xx_uart sunsu efm32-uart pmac_zilog mpsc msm_serial m32r_sio Unaffected drivers: omap-serial rp2 sa1100 imx icom Annotated for fixes: altera_uart mcf Drivers without break detection: 21285 xilinx-uartps altera_jtaguart apbuart arc-uart clps711x max3100 uartlite msm_serial_hs nwpserial lantiq vt8500_serial Unknown: samsung mpc52xx_uart bfin_sport_uart cpm_uart/core Fixes: Bugzilla #71651, '8250_core.c incorrectly handles IGNBRK flag' Reported-by: Ivan <athlon_@mail.ru> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-06-16 19:10:41 +07:00
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
dport->port.read_status_mask |= DZ_BREAK;
/* characters to ignore */
uport->ignore_status_mask = 0;
if ((termios->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
dport->port.ignore_status_mask |= DZ_OERR;
if (termios->c_iflag & IGNPAR)
dport->port.ignore_status_mask |= DZ_FERR | DZ_PERR;
if (termios->c_iflag & IGNBRK)
dport->port.ignore_status_mask |= DZ_BREAK;
spin_unlock_irqrestore(&dport->port.lock, flags);
}
/*
* Hack alert!
* Required solely so that the initial PROM-based console
* works undisturbed in parallel with this one.
*/
static void dz_pm(struct uart_port *uport, unsigned int state,
unsigned int oldstate)
{
struct dz_port *dport = to_dport(uport);
unsigned long flags;
spin_lock_irqsave(&dport->port.lock, flags);
if (state < 3)
dz_start_tx(&dport->port);
else
dz_stop_tx(&dport->port);
spin_unlock_irqrestore(&dport->port.lock, flags);
}
static const char *dz_type(struct uart_port *uport)
{
return "DZ";
}
static void dz_release_port(struct uart_port *uport)
{
struct dz_mux *mux = to_dport(uport)->mux;
int map_guard;
iounmap(uport->membase);
uport->membase = NULL;
map_guard = atomic_add_return(-1, &mux->map_guard);
if (!map_guard)
release_mem_region(uport->mapbase, dec_kn_slot_size);
}
static int dz_map_port(struct uart_port *uport)
{
if (!uport->membase)
uport->membase = ioremap_nocache(uport->mapbase,
dec_kn_slot_size);
if (!uport->membase) {
printk(KERN_ERR "dz: Cannot map MMIO\n");
return -ENOMEM;
}
return 0;
}
static int dz_request_port(struct uart_port *uport)
{
struct dz_mux *mux = to_dport(uport)->mux;
int map_guard;
int ret;
map_guard = atomic_add_return(1, &mux->map_guard);
if (map_guard == 1) {
if (!request_mem_region(uport->mapbase, dec_kn_slot_size,
"dz")) {
atomic_add(-1, &mux->map_guard);
printk(KERN_ERR
"dz: Unable to reserve MMIO resource\n");
return -EBUSY;
}
}
ret = dz_map_port(uport);
if (ret) {
map_guard = atomic_add_return(-1, &mux->map_guard);
if (!map_guard)
release_mem_region(uport->mapbase, dec_kn_slot_size);
return ret;
}
return 0;
}
static void dz_config_port(struct uart_port *uport, int flags)
{
struct dz_port *dport = to_dport(uport);
if (flags & UART_CONFIG_TYPE) {
if (dz_request_port(uport))
return;
uport->type = PORT_DZ;
dz_reset(dport);
}
}
/*
* Verify the new serial_struct (for TIOCSSERIAL).
*/
static int dz_verify_port(struct uart_port *uport, struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_DZ)
ret = -EINVAL;
if (ser->irq != uport->irq)
ret = -EINVAL;
return ret;
}
tty: serial: constify uart_ops structures Declare uart_ops structures as const as they are only stored in the ops field of an uart_port structure. This field is of type const, so uart_ops structures having this property can be made const too. File size details before and after patching. First line of every .o file shows the file size before patching and second line shows the size after patching. text data bss dec hex filename 2977 456 64 3497 da9 drivers/tty/serial/amba-pl010.o 3169 272 64 3505 db1 drivers/tty/serial/amba-pl010.o 3109 456 0 3565 ded drivers/tty/serial/efm32-uart.o 3301 272 0 3573 df5 drivers/tty/serial/efm32-uart.o 10668 753 1 11422 2c9e drivers/tty/serial/icom.o 10860 561 1 11422 2c9e drivers/tty/serial/icom.o 23904 408 8 24320 5f00 drivers/tty/serial/ioc3_serial.o 24088 224 8 24320 5f00 drivers/tty/serial/ioc3_serial.o 10516 560 4 11080 2b48 drivers/tty/serial/ioc4_serial.o 10709 368 4 11081 2b49 drivers/tty/serial/ioc4_serial.o 7853 648 1216 9717 25f5 drivers/tty/serial/mpsc.o 8037 456 1216 9709 25ed drivers/tty/serial/mpsc.o 10248 456 0 10704 29d0 drivers/tty/serial/omap-serial.o 10440 272 0 10712 29d8 drivers/tty/serial/omap-serial.o 8122 532 1984 10638 298e drivers/tty/serial/pmac_zilog.o 8306 340 1984 10630 2986 drivers/tty/serial/pmac_zilog.o 3808 456 0 4264 10a8 drivers/tty/serial/pxa.o 4000 264 0 4264 10a8 drivers/tty/serial/pxa.o 21781 3864 0 25645 642d drivers/tty/serial/serial-tegra.o 22037 3608 0 25645 642d drivers/tty/serial/serial-tegra.o 2481 456 96 3033 bd9 drivers/tty/serial/sprd_serial.o 2673 272 96 3041 be1 drivers/tty/serial/sprd_serial.o 5534 300 512 6346 18ca drivers/tty/serial/vr41xx_siu.o 5630 204 512 6346 18ca drivers/tty/serial/vr41xx_siu.o 6730 1576 128 8434 20f2 drivers/tty/serial/vt8500_serial.o 6986 1320 128 8434 20f2 drivers/tty/serial/vt8500_serial.o Cross compiled for mips architecture. 3005 488 0 3493 da5 drivers/tty/serial/pnx8xxx_uart.o 3189 304 0 3493 da5 drivers/tty/serial/pnx8xxx_uart.o 4272 196 1056 5524 1594 drivers/tty/serial/dz.o 4368 100 1056 5524 1594 drivers/tty/serial/dz.o 6551 144 16 6711 1a37 drivers/tty/serial/ip22zilog.o 6647 48 16 6711 1a37 drivers/tty/serial/ip22zilog.o 9612 428 1520 11560 2d28 drivers/tty/serial/serial_txx9.o 9708 332 1520 11560 2d28 drivers/tty/serial/serial_txx9.o 4156 296 16 4468 1174 drivers/tty/serial/ar933x_uart.o 4252 200 16 4468 1174 drivers/tty/serial/ar933x_uart.o Cross compiled for arm archiecture. 11716 1780 44 13540 34e4 drivers/tty/serial/sirfsoc_uart.o 11808 1688 44 13540 34e4 drivers/tty/serial/sirfsoc_uart.o 13352 596 56 14004 36b4 drivers/tty/serial/amba-pl011.o 13444 504 56 14004 36b4 drivers/tty/serial/amba-pl011.o Cross compiled for sparc architecture. 4664 528 32 5224 1468 drivers/tty/serial/sunhv.o 4848 344 32 5224 1468 drivers/tty/serial/sunhv.o 8080 332 28 8440 20f8 drivers/tty/serial/sunzilog.o 8184 228 28 8440 20f8 drivers/tty/serial/sunzilog.o Cross compiled for ia64 architecture. 10226 549 472 11247 2bef drivers/tty/serial/sn_console.o 10414 365 472 11251 2bf3 drivers/tty/serial/sn_console.o The files drivers/tty/serial/zs.o, drivers/tty/serial/lpc32xx_hs.o and drivers/tty/serial/lantiq.o did not compile. Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-01-26 00:48:52 +07:00
static const struct uart_ops dz_ops = {
.tx_empty = dz_tx_empty,
.get_mctrl = dz_get_mctrl,
.set_mctrl = dz_set_mctrl,
.stop_tx = dz_stop_tx,
.start_tx = dz_start_tx,
.stop_rx = dz_stop_rx,
.break_ctl = dz_break_ctl,
.startup = dz_startup,
.shutdown = dz_shutdown,
.set_termios = dz_set_termios,
.pm = dz_pm,
.type = dz_type,
.release_port = dz_release_port,
.request_port = dz_request_port,
.config_port = dz_config_port,
.verify_port = dz_verify_port,
};
static void __init dz_init_ports(void)
{
static int first = 1;
unsigned long base;
int line;
if (!first)
return;
first = 0;
if (mips_machtype == MACH_DS23100 || mips_machtype == MACH_DS5100)
base = dec_kn_slot_base + KN01_DZ11;
else
base = dec_kn_slot_base + KN02_DZ11;
for (line = 0; line < DZ_NB_PORT; line++) {
struct dz_port *dport = &dz_mux.dport[line];
struct uart_port *uport = &dport->port;
dport->mux = &dz_mux;
uport->irq = dec_interrupt[DEC_IRQ_DZ11];
uport->fifosize = 1;
uport->iotype = UPIO_MEM;
uport->flags = UPF_BOOT_AUTOCONF;
uport->ops = &dz_ops;
uport->line = line;
uport->mapbase = base;
}
}
#ifdef CONFIG_SERIAL_DZ_CONSOLE
/*
* -------------------------------------------------------------------
* dz_console_putchar() -- transmit a character
*
* Polled transmission. This is tricky. We need to mask transmit
* interrupts so that they do not interfere, enable the transmitter
* for the line requested and then wait till the transmit scanner
* requests data for this line. But it may request data for another
* line first, in which case we have to disable its transmitter and
* repeat waiting till our line pops up. Only then the character may
* be transmitted. Finally, the state of the transmitter mask is
* restored. Welcome to the world of PDP-11!
* -------------------------------------------------------------------
*/
static void dz_console_putchar(struct uart_port *uport, int ch)
{
struct dz_port *dport = to_dport(uport);
unsigned long flags;
unsigned short csr, tcr, trdy, mask;
int loops = 10000;
spin_lock_irqsave(&dport->port.lock, flags);
csr = dz_in(dport, DZ_CSR);
dz_out(dport, DZ_CSR, csr & ~DZ_TIE);
tcr = dz_in(dport, DZ_TCR);
tcr |= 1 << dport->port.line;
mask = tcr;
dz_out(dport, DZ_TCR, mask);
iob();
spin_unlock_irqrestore(&dport->port.lock, flags);
do {
trdy = dz_in(dport, DZ_CSR);
if (!(trdy & DZ_TRDY))
continue;
trdy = (trdy & DZ_TLINE) >> 8;
if (trdy == dport->port.line)
break;
mask &= ~(1 << trdy);
dz_out(dport, DZ_TCR, mask);
iob();
udelay(2);
} while (--loops);
if (loops) /* Cannot send otherwise. */
dz_out(dport, DZ_TDR, ch);
dz_out(dport, DZ_TCR, tcr);
dz_out(dport, DZ_CSR, csr);
}
/*
* -------------------------------------------------------------------
* dz_console_print ()
*
* dz_console_print is registered for printk.
* The console must be locked when we get here.
* -------------------------------------------------------------------
*/
static void dz_console_print(struct console *co,
const char *str,
unsigned int count)
{
struct dz_port *dport = &dz_mux.dport[co->index];
#ifdef DEBUG_DZ
prom_printf((char *) str);
#endif
uart_console_write(&dport->port, str, count, dz_console_putchar);
}
static int __init dz_console_setup(struct console *co, char *options)
{
struct dz_port *dport = &dz_mux.dport[co->index];
struct uart_port *uport = &dport->port;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
ret = dz_map_port(uport);
if (ret)
return ret;
spin_lock_init(&dport->port.lock); /* For dz_pm(). */
dz_reset(dport);
dz_pm(uport, 0, -1);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(&dport->port, co, baud, parity, bits, flow);
}
static struct uart_driver dz_reg;
static struct console dz_console = {
.name = "ttyS",
.write = dz_console_print,
.device = uart_console_device,
.setup = dz_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &dz_reg,
};
static int __init dz_serial_console_init(void)
{
if (!IOASIC) {
dz_init_ports();
register_console(&dz_console);
return 0;
} else
return -ENXIO;
}
console_initcall(dz_serial_console_init);
#define SERIAL_DZ_CONSOLE &dz_console
#else
#define SERIAL_DZ_CONSOLE NULL
#endif /* CONFIG_SERIAL_DZ_CONSOLE */
static struct uart_driver dz_reg = {
.owner = THIS_MODULE,
.driver_name = "serial",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = DZ_NB_PORT,
.cons = SERIAL_DZ_CONSOLE,
};
static int __init dz_init(void)
{
int ret, i;
if (IOASIC)
return -ENXIO;
printk("%s%s\n", dz_name, dz_version);
dz_init_ports();
ret = uart_register_driver(&dz_reg);
if (ret)
return ret;
for (i = 0; i < DZ_NB_PORT; i++)
uart_add_one_port(&dz_reg, &dz_mux.dport[i].port);
return 0;
}
module_init(dz_init);