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TTY/Serial patches for 4.20-rc1

Browse source 
Here is the big tty and serial pull request for 4.20-rc1
 
 Lots of little things here, including a merge from the SPI tree in order
 to keep things simpler for everyone to sync around for one platform.
 
 Major stuff is:
 	- tty buffer clearing after use
 	- atmel_serial fixes and additions
 	- xilinx uart driver updates
 and of course, lots of tiny fixes and additions to individual serial
 drivers.
 
 All of these have been in linux-next with no reported issues for a
 while.
 
 Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Merge tag 'tty-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial updates from Greg KH:
 "Here is the big tty and serial pull request for 4.20-rc1

  Lots of little things here, including a merge from the SPI tree in
  order to keep things simpler for everyone to sync around for one
  platform.

  Major stuff is:

   - tty buffer clearing after use

   - atmel_serial fixes and additions

   - xilinx uart driver updates

  and of course, lots of tiny fixes and additions to individual serial
  drivers.

  All of these have been in linux-next with no reported issues for a
  while"

* tag 'tty-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (66 commits)
  of: base: Change logic in of_alias_get_alias_list()
  of: base: Fix english spelling in of_alias_get_alias_list()
  serial: sh-sci: do not warn if DMA transfers are not supported
  serial: uartps: Do not allow use aliases >= MAX_UART_INSTANCES
  tty: check name length in tty_find_polling_driver()
  serial: sh-sci: Add r8a77990 support
  tty: wipe buffer if not echoing data
  tty: wipe buffer.
  serial: fsl_lpuart: Remove the alias node dependence
  TTY: sn_console: Replace spin_is_locked() with spin_trylock()
  Revert "serial:serial_core: Allow use of CTS for PPS line discipline"
  serial: 8250_uniphier: add auto-flow-control support
  serial: 8250_uniphier: flatten probe function
  serial: 8250_uniphier: remove unused "fifo-size" property
  dt-bindings: serial: sh-sci: Document r8a7744 bindings
  serial: uartps: Fix missing unlock on error in cdns_get_id()
  tty/serial: atmel: add ISO7816 support
  tty/serial_core: add ISO7816 infrastructure
  serial:serial_core: Allow use of CTS for PPS line discipline
  serial: docs: Fix filename for serial reference implementation
  ...
This commit is contained in:
Linus Torvalds 2018-10-29 10:42:20 -07:00
commit 5bd4af34a0
43 changed files with 977 additions and 380 deletions
Download patch file Download diff file Expand all files Collapse all files

12
drivers/tty/ehv_bytechan.c
View file

@ -128,8 +128,8 @@ static int find_console_handle(void)
*/
iprop = of_get_property(np, "hv-handle", NULL);
if (!iprop) {
pr_err("ehv-bc: no 'hv-handle' property in %s node\n",
np->name);
pr_err("ehv-bc: no 'hv-handle' property in %pOFn node\n",
np);
return 0;
}
stdout_bc = be32_to_cpu(*iprop);
@ -661,8 +661,8 @@ static int ehv_bc_tty_probe(struct platform_device *pdev)
iprop = of_get_property(np, "hv-handle", NULL);
if (!iprop) {
dev_err(&pdev->dev, "no 'hv-handle' property in %s node\n",
np->name);
dev_err(&pdev->dev, "no 'hv-handle' property in %pOFn node\n",
np);
return -ENODEV;
}
@ -682,8 +682,8 @@ static int ehv_bc_tty_probe(struct platform_device *pdev)
bc->rx_irq = irq_of_parse_and_map(np, 0);
bc->tx_irq = irq_of_parse_and_map(np, 1);
if ((bc->rx_irq == NO_IRQ) || (bc->tx_irq == NO_IRQ)) {
dev_err(&pdev->dev, "no 'interrupts' property in %s node\n",
np->name);
dev_err(&pdev->dev, "no 'interrupts' property in %pOFn node\n",
np);
ret = -ENODEV;
goto error;
}

20
drivers/tty/n_tty.c
View file

@ -152,17 +152,28 @@ static inline unsigned char *echo_buf_addr(struct n_tty_data *ldata, size_t i)
return &ldata->echo_buf[i & (N_TTY_BUF_SIZE - 1)];
}
/* If we are not echoing the data, perhaps this is a secret so erase it */
static void zero_buffer(struct tty_struct *tty, u8 *buffer, int size)
{
bool icanon = !!L_ICANON(tty);
bool no_echo = !L_ECHO(tty);
if (icanon && no_echo)
memset(buffer, 0x00, size);
}
static int tty_copy_to_user(struct tty_struct *tty, void __user *to,
size_t tail, size_t n)
{
struct n_tty_data *ldata = tty->disc_data;
size_t size = N_TTY_BUF_SIZE - tail;
const void *from = read_buf_addr(ldata, tail);
void *from = read_buf_addr(ldata, tail);
int uncopied;
if (n > size) {
tty_audit_add_data(tty, from, size);
uncopied = copy_to_user(to, from, size);
zero_buffer(tty, from, size - uncopied);
if (uncopied)
return uncopied;
to += size;
@ -171,7 +182,9 @@ static int tty_copy_to_user(struct tty_struct *tty, void __user *to,
}
tty_audit_add_data(tty, from, n);
return copy_to_user(to, from, n);
uncopied = copy_to_user(to, from, n);
zero_buffer(tty, from, n - uncopied);
return uncopied;
}
/**
@ -1960,11 +1973,12 @@ static int copy_from_read_buf(struct tty_struct *tty,
n = min(head - ldata->read_tail, N_TTY_BUF_SIZE - tail);
n = min(*nr, n);
if (n) {
const unsigned char *from = read_buf_addr(ldata, tail);
unsigned char *from = read_buf_addr(ldata, tail);
retval = copy_to_user(*b, from, n);
n -= retval;
is_eof = n == 1 && *from == EOF_CHAR(tty);
tty_audit_add_data(tty, from, n);
zero_buffer(tty, from, n);
smp_store_release(&ldata->read_tail, ldata->read_tail + n);
/* Turn single EOF into zero-length read */
if (L_EXTPROC(tty) && ldata->icanon && is_eof &&

6
drivers/tty/serial/8250/8250_core.c
View file

@ -130,12 +130,8 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
l = l->next;
if (l == i->head && pass_counter++ > PASS_LIMIT) {
/* If we hit this, we're dead. */
printk_ratelimited(KERN_ERR
"serial8250: too much work for irq%d\n", irq);
if (l == i->head && pass_counter++ > PASS_LIMIT)
break;
}
} while (l != end);
spin_unlock(&i->lock);

22
drivers/tty/serial/8250/8250_of.c
View file

@ -58,7 +58,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
struct resource resource;
struct device_node *np = ofdev->dev.of_node;
u32 clk, spd, prop;
int ret;
int ret, irq;
memset(port, 0, sizeof *port);
@ -143,21 +143,27 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
if (ret >= 0)
port->line = ret;
port->irq = irq_of_parse_and_map(np, 0);
if (!port->irq) {
ret = -EPROBE_DEFER;
goto err_unprepare;
irq = of_irq_get(np, 0);
if (irq < 0) {
if (irq == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto err_unprepare;
}
/* IRQ support not mandatory */
irq = 0;
}
port->irq = irq;
info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
if (IS_ERR(info->rst)) {
ret = PTR_ERR(info->rst);
goto err_dispose;
goto err_unprepare;
}
ret = reset_control_deassert(info->rst);
if (ret)
goto err_dispose;
goto err_unprepare;
port->type = type;
port->uartclk = clk;
@ -184,8 +190,6 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
port->handle_irq = fsl8250_handle_irq;
return 0;
err_dispose:
irq_dispose_mapping(port->irq);
err_unprepare:
clk_disable_unprepare(info->clk);
err_pmruntime:

29
drivers/tty/serial/8250/8250_port.c
View file

@ -552,11 +552,30 @@ static unsigned int serial_icr_read(struct uart_8250_port *up, int offset)
*/
static void serial8250_clear_fifos(struct uart_8250_port *p)
{
unsigned char fcr;
unsigned char clr_mask = UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
if (p->capabilities & UART_CAP_FIFO) {
serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO);
serial_out(p, UART_FCR, UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
serial_out(p, UART_FCR, 0);
/*
* Make sure to avoid changing FCR[7:3] and ENABLE_FIFO bits.
* In case ENABLE_FIFO is not set, there is nothing to flush
* so just return. Furthermore, on certain implementations of
* the 8250 core, the FCR[7:3] bits may only be changed under
* specific conditions and changing them if those conditions
* are not met can have nasty side effects. One such core is
* the 8250-omap present in TI AM335x.
*/
fcr = serial_in(p, UART_FCR);
/* FIFO is not enabled, there's nothing to clear. */
if (!(fcr & UART_FCR_ENABLE_FIFO))
return;
fcr |= clr_mask;
serial_out(p, UART_FCR, fcr);
fcr &= ~clr_mask;
serial_out(p, UART_FCR, fcr);
}
}
@ -1448,7 +1467,7 @@ static void __do_stop_tx_rs485(struct uart_8250_port *p)
* Enable previously disabled RX interrupts.
*/
if (!(p->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
serial8250_clear_and_reinit_fifos(p);
serial8250_clear_fifos(p);
p->ier |= UART_IER_RLSI | UART_IER_RDI;
serial_port_out(&p->port, UART_IER, p->ier);

62
drivers/tty/serial/8250/8250_uniphier.c
View file

@ -12,9 +12,6 @@
#include "8250.h"
/* Most (but not all) of UniPhier UART devices have 64-depth FIFO. */
#define UNIPHIER_UART_DEFAULT_FIFO_SIZE 64
/*
* This hardware is similar to 8250, but its register map is a bit different:
* - MMIO32 (regshift = 2)
@ -158,42 +155,6 @@ static void uniphier_serial_dl_write(struct uart_8250_port *up, int value)
writel(value, up->port.membase + UNIPHIER_UART_DLR);
}
static int uniphier_of_serial_setup(struct device *dev, struct uart_port *port,
struct uniphier8250_priv *priv)
{
int ret;
u32 prop;
struct device_node *np = dev->of_node;
ret = of_alias_get_id(np, "serial");
if (ret < 0) {
dev_err(dev, "failed to get alias id\n");
return ret;
}
port->line = ret;
/* Get clk rate through clk driver */
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "failed to get clock\n");
return PTR_ERR(priv->clk);
}
ret = clk_prepare_enable(priv->clk);
if (ret < 0)
return ret;
port->uartclk = clk_get_rate(priv->clk);
/* Check for fifo size */
if (of_property_read_u32(np, "fifo-size", &prop) == 0)
port->fifosize = prop;
else
port->fifosize = UNIPHIER_UART_DEFAULT_FIFO_SIZE;
return 0;
}
static int uniphier_uart_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -226,9 +187,24 @@ static int uniphier_uart_probe(struct platform_device *pdev)
memset(&up, 0, sizeof(up));
ret = uniphier_of_serial_setup(dev, &up.port, priv);
if (ret < 0)
ret = of_alias_get_id(dev->of_node, "serial");
if (ret < 0) {
dev_err(dev, "failed to get alias id\n");
return ret;
}
up.port.line = ret;
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "failed to get clock\n");
return PTR_ERR(priv->clk);
}
ret = clk_prepare_enable(priv->clk);
if (ret)
return ret;
up.port.uartclk = clk_get_rate(priv->clk);
spin_lock_init(&priv->atomic_write_lock);
@ -241,10 +217,14 @@ static int uniphier_uart_probe(struct platform_device *pdev)
up.port.type = PORT_16550A;
up.port.iotype = UPIO_MEM32;
up.port.fifosize = 64;
up.port.regshift = UNIPHIER_UART_REGSHIFT;
up.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE;
up.capabilities = UART_CAP_FIFO;
if (of_property_read_bool(dev->of_node, "auto-flow-control"))
up.capabilities |= UART_CAP_AFE;
up.port.serial_in = uniphier_serial_in;
up.port.serial_out = uniphier_serial_out;
up.dl_read = uniphier_serial_dl_read;

2
drivers/tty/serial/8250/Kconfig
View file

@ -375,7 +375,7 @@ config SERIAL_8250_RT288X
config SERIAL_8250_OMAP
tristate "Support for OMAP internal UART (8250 based driver)"
depends on SERIAL_8250 && ARCH_OMAP2PLUS
depends on SERIAL_8250 && (ARCH_OMAP2PLUS || ARCH_K3)
help
If you have a machine based on an Texas Instruments OMAP CPU you
can enable its onboard serial ports by enabling this option.

190
drivers/tty/serial/atmel_serial.c
View file

@ -34,6 +34,7 @@
#include <linux/suspend.h>
#include <linux/mm.h>
#include <asm/div64.h>
#include <asm/io.h>
#include <asm/ioctls.h>
@ -147,6 +148,8 @@ struct atmel_uart_port {
struct circ_buf rx_ring;
struct mctrl_gpios *gpios;
u32 backup_mode; /* MR saved during iso7816 operations */
u32 backup_brgr; /* BRGR saved during iso7816 operations */
unsigned int tx_done_mask;
u32 fifo_size;
u32 rts_high;
@ -163,6 +166,10 @@ struct atmel_uart_port {
unsigned int pending_status;
spinlock_t lock_suspended;
/* ISO7816 */
unsigned int fidi_min;
unsigned int fidi_max;
#ifdef CONFIG_PM
struct {
u32 cr;
@ -361,6 +368,127 @@ static int atmel_config_rs485(struct uart_port *port,
return 0;
}
static unsigned int atmel_calc_cd(struct uart_port *port,
struct serial_iso7816 *iso7816conf)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned int cd;
u64 mck_rate;
mck_rate = (u64)clk_get_rate(atmel_port->clk);
do_div(mck_rate, iso7816conf->clk);
cd = mck_rate;
return cd;
}
static unsigned int atmel_calc_fidi(struct uart_port *port,
struct serial_iso7816 *iso7816conf)
{
u64 fidi = 0;
if (iso7816conf->sc_fi && iso7816conf->sc_di) {
fidi = (u64)iso7816conf->sc_fi;
do_div(fidi, iso7816conf->sc_di);
}
return (u32)fidi;
}
/* Enable or disable the iso7816 support */
/* Called with interrupts disabled */
static int atmel_config_iso7816(struct uart_port *port,
struct serial_iso7816 *iso7816conf)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned int mode;
unsigned int cd, fidi;
int ret = 0;
/* Disable interrupts */
atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
mode = atmel_uart_readl(port, ATMEL_US_MR);
if (iso7816conf->flags & SER_ISO7816_ENABLED) {
mode &= ~ATMEL_US_USMODE;
if (iso7816conf->tg > 255) {
dev_err(port->dev, "ISO7816: Timeguard exceeding 255\n");
memset(iso7816conf, 0, sizeof(struct serial_iso7816));
ret = -EINVAL;
goto err_out;
}
if ((iso7816conf->flags & SER_ISO7816_T_PARAM)
== SER_ISO7816_T(0)) {
mode |= ATMEL_US_USMODE_ISO7816_T0 | ATMEL_US_DSNACK;
} else if ((iso7816conf->flags & SER_ISO7816_T_PARAM)
== SER_ISO7816_T(1)) {
mode |= ATMEL_US_USMODE_ISO7816_T1 | ATMEL_US_INACK;
} else {
dev_err(port->dev, "ISO7816: Type not supported\n");
memset(iso7816conf, 0, sizeof(struct serial_iso7816));
ret = -EINVAL;
goto err_out;
}
mode &= ~(ATMEL_US_USCLKS | ATMEL_US_NBSTOP | ATMEL_US_PAR);
/* select mck clock, and output */
mode |= ATMEL_US_USCLKS_MCK | ATMEL_US_CLKO;
/* set parity for normal/inverse mode + max iterations */
mode |= ATMEL_US_PAR_EVEN | ATMEL_US_NBSTOP_1 | ATMEL_US_MAX_ITER(3);
cd = atmel_calc_cd(port, iso7816conf);
fidi = atmel_calc_fidi(port, iso7816conf);
if (fidi == 0) {
dev_warn(port->dev, "ISO7816 fidi = 0, Generator generates no signal\n");
} else if (fidi < atmel_port->fidi_min
|| fidi > atmel_port->fidi_max) {
dev_err(port->dev, "ISO7816 fidi = %u, value not supported\n", fidi);
memset(iso7816conf, 0, sizeof(struct serial_iso7816));
ret = -EINVAL;
goto err_out;
}
if (!(port->iso7816.flags & SER_ISO7816_ENABLED)) {
/* port not yet in iso7816 mode: store configuration */
atmel_port->backup_mode = atmel_uart_readl(port, ATMEL_US_MR);
atmel_port->backup_brgr = atmel_uart_readl(port, ATMEL_US_BRGR);
}
atmel_uart_writel(port, ATMEL_US_TTGR, iso7816conf->tg);
atmel_uart_writel(port, ATMEL_US_BRGR, cd);
atmel_uart_writel(port, ATMEL_US_FIDI, fidi);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXDIS | ATMEL_US_RXEN);
atmel_port->tx_done_mask = ATMEL_US_TXEMPTY | ATMEL_US_NACK | ATMEL_US_ITERATION;
} else {
dev_dbg(port->dev, "Setting UART back to RS232\n");
/* back to last RS232 settings */
mode = atmel_port->backup_mode;
memset(iso7816conf, 0, sizeof(struct serial_iso7816));
atmel_uart_writel(port, ATMEL_US_TTGR, 0);
atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->backup_brgr);
atmel_uart_writel(port, ATMEL_US_FIDI, 0x174);
if (atmel_use_pdc_tx(port))
atmel_port->tx_done_mask = ATMEL_US_ENDTX |
ATMEL_US_TXBUFE;
else
atmel_port->tx_done_mask = ATMEL_US_TXRDY;
}
port->iso7816 = *iso7816conf;
atmel_uart_writel(port, ATMEL_US_MR, mode);
err_out:
/* Enable interrupts */
atmel_uart_writel(port, ATMEL_US_IER, atmel_port->tx_done_mask);
return ret;
}
/*
* Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
*/
@ -480,8 +608,9 @@ static void atmel_stop_tx(struct uart_port *port)
/* Disable interrupts */
atmel_uart_writel(port, ATMEL_US_IDR, atmel_port->tx_done_mask);
if ((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX))
if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED)
atmel_start_rx(port);
}
@ -499,8 +628,9 @@ static void atmel_start_tx(struct uart_port *port)
return;
if (atmel_use_pdc_tx(port) || atmel_use_dma_tx(port))
if ((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX))
if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED)
atmel_stop_rx(port);
if (atmel_use_pdc_tx(port))
@ -798,8 +928,9 @@ static void atmel_complete_tx_dma(void *arg)
*/
if (!uart_circ_empty(xmit))
atmel_tasklet_schedule(atmel_port, &atmel_port->tasklet_tx);
else if ((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) {
else if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED) {
/* DMA done, stop TX, start RX for RS485 */
atmel_start_rx(port);
}
@ -1282,6 +1413,9 @@ atmel_handle_status(struct uart_port *port, unsigned int pending,
wake_up_interruptible(&port->state->port.delta_msr_wait);
}
}
if (pending & (ATMEL_US_NACK | ATMEL_US_ITERATION))
dev_dbg(port->dev, "ISO7816 ERROR (0x%08x)\n", pending);
}
/*
@ -1374,8 +1508,9 @@ static void atmel_tx_pdc(struct uart_port *port)
atmel_uart_writel(port, ATMEL_US_IER,
atmel_port->tx_done_mask);
} else {
if ((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) {
if (((port->rs485.flags & SER_RS485_ENABLED) &&
!(port->rs485.flags & SER_RS485_RX_DURING_TX)) ||
port->iso7816.flags & SER_ISO7816_ENABLED) {
/* DMA done, stop TX, start RX for RS485 */
atmel_start_rx(port);
}
@ -1727,6 +1862,22 @@ static void atmel_get_ip_name(struct uart_port *port)
atmel_port->has_frac_baudrate = true;
atmel_port->has_hw_timer = true;
atmel_port->rtor = ATMEL_US_RTOR;
version = atmel_uart_readl(port, ATMEL_US_VERSION);
switch (version) {
case 0x814: /* sama5d2 */
/* fall through */
case 0x701: /* sama5d4 */
atmel_port->fidi_min = 3;
atmel_port->fidi_max = 65535;
break;
case 0x502: /* sam9x5, sama5d3 */
atmel_port->fidi_min = 3;
atmel_port->fidi_max = 2047;
break;
default:
atmel_port->fidi_min = 1;
atmel_port->fidi_max = 2047;
}
} else if (name == dbgu_uart) {
dev_dbg(port->dev, "Dbgu or uart without hw timer\n");
} else {
@ -2100,6 +2251,17 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
atmel_uart_writel(port, ATMEL_US_TTGR,
port->rs485.delay_rts_after_send);
mode |= ATMEL_US_USMODE_RS485;
} else if (port->iso7816.flags & SER_ISO7816_ENABLED) {
atmel_uart_writel(port, ATMEL_US_TTGR, port->iso7816.tg);
/* select mck clock, and output */
mode |= ATMEL_US_USCLKS_MCK | ATMEL_US_CLKO;
/* set max iterations */
mode |= ATMEL_US_MAX_ITER(3);
if ((port->iso7816.flags & SER_ISO7816_T_PARAM)
== SER_ISO7816_T(0))
mode |= ATMEL_US_USMODE_ISO7816_T0;
else
mode |= ATMEL_US_USMODE_ISO7816_T1;
} else if (termios->c_cflag & CRTSCTS) {
/* RS232 with hardware handshake (RTS/CTS) */
if (atmel_use_fifo(port) &&
@ -2176,7 +2338,8 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
}
quot = cd | fp << ATMEL_US_FP_OFFSET;
atmel_uart_writel(port, ATMEL_US_BRGR, quot);
if (!(port->iso7816.flags & SER_ISO7816_ENABLED))
atmel_uart_writel(port, ATMEL_US_BRGR, quot);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_TXEN | ATMEL_US_RXEN);
atmel_port->tx_stopped = false;
@ -2357,6 +2520,7 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
port->mapbase = mpdev->resource[0].start;
port->irq = mpdev->resource[1].start;
port->rs485_config = atmel_config_rs485;
port->iso7816_config = atmel_config_iso7816;
port->membase = NULL;
memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
@ -2380,8 +2544,12 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
/* only enable clock when USART is in use */
}
/* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
if (port->rs485.flags & SER_RS485_ENABLED)
/*
* Use TXEMPTY for interrupt when rs485 or ISO7816 else TXRDY or
* ENDTX|TXBUFE
*/
if (port->rs485.flags & SER_RS485_ENABLED ||
port->iso7816.flags & SER_ISO7816_ENABLED)
atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
else if (atmel_use_pdc_tx(port)) {
port->fifosize = PDC_BUFFER_SIZE;

3
drivers/tty/serial/atmel_serial.h
View file

@ -78,7 +78,8 @@
#define ATMEL_US_OVER BIT(19) /* Oversampling Mode */
#define ATMEL_US_INACK BIT(20) /* Inhibit Non Acknowledge */
#define ATMEL_US_DSNACK BIT(21) /* Disable Successive NACK */
#define ATMEL_US_MAX_ITER GENMASK(26, 24) /* Max Iterations */
#define ATMEL_US_MAX_ITER_MASK GENMASK(26, 24) /* Max Iterations */
#define ATMEL_US_MAX_ITER(n) (((n) << 24) & ATMEL_US_MAX_ITER_MASK)
#define ATMEL_US_FILTER BIT(28) /* Infrared Receive Line Filter */
#define ATMEL_US_IER 0x08 /* Interrupt Enable Register */

8
drivers/tty/serial/cpm_uart/cpm_uart_core.c
View file

@ -1155,8 +1155,8 @@ static int cpm_uart_init_port(struct device_node *np,
if (!pinfo->clk) {
data = of_get_property(np, "fsl,cpm-brg", &len);
if (!data || len != 4) {
printk(KERN_ERR "CPM UART %s has no/invalid "
"fsl,cpm-brg property.\n", np->name);
printk(KERN_ERR "CPM UART %pOFn has no/invalid "
"fsl,cpm-brg property.\n", np);
return -EINVAL;
}
pinfo->brg = *data;
@ -1164,8 +1164,8 @@ static int cpm_uart_init_port(struct device_node *np,
data = of_get_property(np, "fsl,cpm-command", &len);
if (!data || len != 4) {
printk(KERN_ERR "CPM UART %s has no/invalid "
"fsl,cpm-command property.\n", np->name);
printk(KERN_ERR "CPM UART %pOFn has no/invalid "
"fsl,cpm-command property.\n", np);
return -EINVAL;
}
pinfo->command = *data;

12
drivers/tty/serial/fsl_lpuart.c
View file

@ -232,6 +232,8 @@
/* IMX lpuart has four extra unused regs located at the beginning */
#define IMX_REG_OFF 0x10
static DEFINE_IDA(fsl_lpuart_ida);
struct lpuart_port {
struct uart_port port;
struct clk *clk;
@ -2143,8 +2145,11 @@ static int lpuart_probe(struct platform_device *pdev)
ret = of_alias_get_id(np, "serial");
if (ret < 0) {
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
return ret;
ret = ida_simple_get(&fsl_lpuart_ida, 0, UART_NR, GFP_KERNEL);
if (ret < 0) {
dev_err(&pdev->dev, "port line is full, add device failed\n");
return ret;
}
}
if (ret >= ARRAY_SIZE(lpuart_ports)) {
dev_err(&pdev->dev, "serial%d out of range\n", ret);
@ -2246,6 +2251,8 @@ static int lpuart_remove(struct platform_device *pdev)
uart_remove_one_port(&lpuart_reg, &sport->port);
ida_simple_remove(&fsl_lpuart_ida, sport->port.line);
clk_disable_unprepare(sport->clk);
if (sport->dma_tx_chan)
@ -2384,6 +2391,7 @@ static int __init lpuart_serial_init(void)
static void __exit lpuart_serial_exit(void)
{
ida_destroy(&fsl_lpuart_ida);
platform_driver_unregister(&lpuart_driver);
uart_unregister_driver(&lpuart_reg);
}

38
drivers/tty/serial/imx.c
View file

@ -24,6 +24,7 @@
#include <linux/serial.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/pinctrl/consumer.h>
#include <linux/rational.h>
#include <linux/slab.h>
#include <linux/of.h>
@ -706,27 +707,25 @@ static irqreturn_t imx_uart_rtsint(int irq, void *dev_id)
{
struct imx_port *sport = dev_id;
u32 usr1;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
spin_lock(&sport->port.lock);
imx_uart_writel(sport, USR1_RTSD, USR1);
usr1 = imx_uart_readl(sport, USR1) & USR1_RTSS;
uart_handle_cts_change(&sport->port, !!usr1);
wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
spin_unlock_irqrestore(&sport->port.lock, flags);
spin_unlock(&sport->port.lock);
return IRQ_HANDLED;
}
static irqreturn_t imx_uart_txint(int irq, void *dev_id)
{
struct imx_port *sport = dev_id;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
spin_lock(&sport->port.lock);
imx_uart_transmit_buffer(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
spin_unlock(&sport->port.lock);
return IRQ_HANDLED;
}
@ -735,9 +734,8 @@ static irqreturn_t imx_uart_rxint(int irq, void *dev_id)
struct imx_port *sport = dev_id;
unsigned int rx, flg, ignored = 0;
struct tty_port *port = &sport->port.state->port;
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
spin_lock(&sport->port.lock);
while (imx_uart_readl(sport, USR2) & USR2_RDR) {
u32 usr2;
@ -797,7 +795,7 @@ static irqreturn_t imx_uart_rxint(int irq, void *dev_id)
}
out:
spin_unlock_irqrestore(&sport->port.lock, flags);
spin_unlock(&sport->port.lock);
tty_flip_buffer_push(port);
return IRQ_HANDLED;
}
@ -903,13 +901,11 @@ static irqreturn_t imx_uart_int(int irq, void *dev_id)
}
if (usr1 & USR1_DTRD) {
unsigned long flags;
imx_uart_writel(sport, USR1_DTRD, USR1);
spin_lock_irqsave(&sport->port.lock, flags);
spin_lock(&sport->port.lock);
imx_uart_mctrl_check(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
spin_unlock(&sport->port.lock);
ret = IRQ_HANDLED;
}
@ -2384,8 +2380,13 @@ static int imx_uart_remove(struct platform_device *pdev)
static void imx_uart_restore_context(struct imx_port *sport)
{
if (!sport->context_saved)
unsigned long flags;
spin_lock_irqsave(&sport->port.lock, flags);
if (!sport->context_saved) {
spin_unlock_irqrestore(&sport->port.lock, flags);
return;
}
imx_uart_writel(sport, sport->saved_reg[4], UFCR);
imx_uart_writel(sport, sport->saved_reg[5], UESC);
@ -2398,11 +2399,15 @@ static void imx_uart_restore_context(struct imx_port *sport)
imx_uart_writel(sport, sport->saved_reg[2], UCR3);
imx_uart_writel(sport, sport->saved_reg[3], UCR4);
sport->context_saved = false;
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static void imx_uart_save_context(struct imx_port *sport)
{
unsigned long flags;
/* Save necessary regs */
spin_lock_irqsave(&sport->port.lock, flags);
sport->saved_reg[0] = imx_uart_readl(sport, UCR1);
sport->saved_reg[1] = imx_uart_readl(sport, UCR2);
sport->saved_reg[2] = imx_uart_readl(sport, UCR3);
@ -2414,6 +2419,7 @@ static void imx_uart_save_context(struct imx_port *sport)
sport->saved_reg[8] = imx_uart_readl(sport, UBMR);
sport->saved_reg[9] = imx_uart_readl(sport, IMX21_UTS);
sport->context_saved = true;
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static void imx_uart_enable_wakeup(struct imx_port *sport, bool on)
@ -2447,6 +2453,8 @@ static int imx_uart_suspend_noirq(struct device *dev)
clk_disable(sport->clk_ipg);
pinctrl_pm_select_sleep_state(dev);
return 0;
}
@ -2455,6 +2463,8 @@ static int imx_uart_resume_noirq(struct device *dev)
struct imx_port *sport = dev_get_drvdata(dev);
int ret;
pinctrl_pm_select_default_state(dev);
ret = clk_enable(sport->clk_ipg);
if (ret)
return ret;

46
drivers/tty/serial/kgdboc.c
View file

@ -8,6 +8,9 @@
*
* 2007-2008 (c) Jason Wessel - Wind River Systems, Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/kgdb.h>
@ -128,19 +131,6 @@ static void kgdboc_unregister_kbd(void)
#define kgdboc_restore_input()
#endif /* ! CONFIG_KDB_KEYBOARD */
static int kgdboc_option_setup(char *opt)
{
if (strlen(opt) >= MAX_CONFIG_LEN) {
printk(KERN_ERR "kgdboc: config string too long\n");
return -ENOSPC;
}
strcpy(config, opt);
return 0;
}
__setup("kgdboc=", kgdboc_option_setup);
static void cleanup_kgdboc(void)
{
if (kgdb_unregister_nmi_console())
@ -154,15 +144,13 @@ static int configure_kgdboc(void)
{
struct tty_driver *p;
int tty_line = 0;
int err;
int err = -ENODEV;
char *cptr = config;
struct console *cons;
err = kgdboc_option_setup(config);
if (err || !strlen(config) || isspace(config[0]))
if (!strlen(config) || isspace(config[0]))
goto noconfig;
err = -ENODEV;
kgdboc_io_ops.is_console = 0;
kgdb_tty_driver = NULL;
@ -248,7 +236,7 @@ static int param_set_kgdboc_var(const char *kmessage,
int len = strlen(kmessage);
if (len >= MAX_CONFIG_LEN) {
printk(KERN_ERR "kgdboc: config string too long\n");
pr_err("config string too long\n");
return -ENOSPC;
}
@ -259,8 +247,7 @@ static int param_set_kgdboc_var(const char *kmessage,
}
if (kgdb_connected) {
printk(KERN_ERR
"kgdboc: Cannot reconfigure while KGDB is connected.\n");
pr_err("Cannot reconfigure while KGDB is connected.\n");
return -EBUSY;
}
@ -311,6 +298,25 @@ static struct kgdb_io kgdboc_io_ops = {
};
#ifdef CONFIG_KGDB_SERIAL_CONSOLE
static int kgdboc_option_setup(char *opt)
{
if (!opt) {
pr_err("config string not provided\n");
return -EINVAL;
}
if (strlen(opt) >= MAX_CONFIG_LEN) {
pr_err("config string too long\n");
return -ENOSPC;
}
strcpy(config, opt);
return 0;
}
__setup("kgdboc=", kgdboc_option_setup);
/* This is only available if kgdboc is a built in for early debugging */
static int __init kgdboc_early_init(char *opt)
{

3
drivers/tty/serial/mxs-auart.c
View file

@ -1634,8 +1634,9 @@ static int mxs_auart_request_gpio_irq(struct mxs_auart_port *s)
/*
* If something went wrong, rollback.
* Be careful: i may be unsigned.
*/
while (err && (--i >= 0))
while (err && (i-- > 0))
if (irq[i] >= 0)
free_irq(irq[i], s);

8
drivers/tty/serial/pmac_zilog.c
View file

@ -219,7 +219,7 @@ static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
static bool pmz_receive_chars(struct uart_pmac_port *uap)
{
struct tty_port *port;
unsigned char ch, r1, drop, error, flag;
unsigned char ch, r1, drop, flag;
int loops = 0;
/* Sanity check, make sure the old bug is no longer happening */
@ -231,7 +231,6 @@ static bool pmz_receive_chars(struct uart_pmac_port *uap)
port = &uap->port.state->port;
while (1) {
error = 0;
drop = 0;
r1 = read_zsreg(uap, R1);
@ -273,7 +272,6 @@ static bool pmz_receive_chars(struct uart_pmac_port *uap)
uap->port.icount.rx++;
if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR | BRK_ABRT)) {
error = 1;
if (r1 & BRK_ABRT) {
pmz_debug("pmz: got break !\n");
r1 &= ~(PAR_ERR | CRC_ERR);
@ -1566,9 +1564,9 @@ static int pmz_attach(struct macio_dev *mdev, const struct of_device_id *match)
* to work around bugs in ancient Apple device-trees
*/
if (macio_request_resources(uap->dev, "pmac_zilog"))
printk(KERN_WARNING "%s: Failed to request resource"
printk(KERN_WARNING "%pOFn: Failed to request resource"
", port still active\n",
uap->node->name);
uap->node);
else
uap->flags |= PMACZILOG_FLAG_RSRC_REQUESTED;

69
drivers/tty/serial/qcom_geni_serial.c
View file

@ -851,6 +851,23 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
{
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
unsigned int rxstale = DEFAULT_BITS_PER_CHAR * STALE_TIMEOUT;
u32 proto;
if (uart_console(uport))
port->tx_bytes_pw = 1;
else
port->tx_bytes_pw = 4;
port->rx_bytes_pw = RX_BYTES_PW;
proto = geni_se_read_proto(&port->se);
if (proto != GENI_SE_UART) {
dev_err(uport->dev, "Invalid FW loaded, proto: %d\n", proto);
return -ENXIO;
}
qcom_geni_serial_stop_rx(uport);
get_tx_fifo_size(port);
set_rfr_wm(port);
writel_relaxed(rxstale, uport->membase + SE_UART_RX_STALE_CNT);
@ -874,30 +891,19 @@ static int qcom_geni_serial_port_setup(struct uart_port *uport)
return -ENOMEM;
}
port->setup = true;
return 0;
}
static int qcom_geni_serial_startup(struct uart_port *uport)
{
int ret;
u32 proto;
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
scnprintf(port->name, sizeof(port->name),
"qcom_serial_%s%d",
(uart_console(uport) ? "console" : "uart"), uport->line);
if (!uart_console(uport)) {
port->tx_bytes_pw = 4;
port->rx_bytes_pw = RX_BYTES_PW;
}
proto = geni_se_read_proto(&port->se);
if (proto != GENI_SE_UART) {
dev_err(uport->dev, "Invalid FW loaded, proto: %d\n", proto);
return -ENXIO;
}
get_tx_fifo_size(port);
if (!port->setup) {
ret = qcom_geni_serial_port_setup(uport);
if (ret)
@ -1056,6 +1062,7 @@ static int __init qcom_geni_console_setup(struct console *co, char *options)
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
if (co->index >= GENI_UART_CONS_PORTS || co->index < 0)
return -ENXIO;
@ -1071,21 +1078,10 @@ static int __init qcom_geni_console_setup(struct console *co, char *options)
if (unlikely(!uport->membase))
return -ENXIO;
if (geni_se_resources_on(&port->se)) {
dev_err(port->se.dev, "Error turning on resources\n");
return -ENXIO;
}
if (unlikely(geni_se_read_proto(&port->se) != GENI_SE_UART)) {
geni_se_resources_off(&port->se);
return -ENXIO;
}
if (!port->setup) {
port->tx_bytes_pw = 1;
port->rx_bytes_pw = RX_BYTES_PW;
qcom_geni_serial_stop_rx(uport);
qcom_geni_serial_port_setup(uport);
ret = qcom_geni_serial_port_setup(uport);
if (ret)
return ret;
}
if (options)
@ -1203,11 +1199,12 @@ static void qcom_geni_serial_pm(struct uart_port *uport,
{
struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
/* If we've never been called, treat it as off */
if (old_state == UART_PM_STATE_UNDEFINED)
old_state = UART_PM_STATE_OFF;
if (new_state == UART_PM_STATE_ON && old_state == UART_PM_STATE_OFF)
geni_se_resources_on(&port->se);
else if (!uart_console(uport) && (new_state == UART_PM_STATE_ON &&
old_state == UART_PM_STATE_UNDEFINED))
geni_se_resources_on(&port->se);
else if (new_state == UART_PM_STATE_OFF &&
old_state == UART_PM_STATE_ON)
geni_se_resources_off(&port->se);
@ -1263,14 +1260,12 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
if (of_device_is_compatible(pdev->dev.of_node, "qcom,geni-debug-uart"))
console = true;
if (pdev->dev.of_node) {
if (console) {
drv = &qcom_geni_console_driver;
line = of_alias_get_id(pdev->dev.of_node, "serial");
} else {
drv = &qcom_geni_uart_driver;
line = of_alias_get_id(pdev->dev.of_node, "hsuart");
}
if (console) {
drv = &qcom_geni_console_driver;
line = of_alias_get_id(pdev->dev.of_node, "serial");
} else {
drv = &qcom_geni_uart_driver;
line = of_alias_get_id(pdev->dev.of_node, "hsuart");
}
port = get_port_from_line(line, console);

8
drivers/tty/serial/samsung.c
View file

@ -1941,7 +1941,11 @@ static int s3c24xx_serial_resume(struct device *dev)
if (port) {
clk_prepare_enable(ourport->clk);
if (!IS_ERR(ourport->baudclk))
clk_prepare_enable(ourport->baudclk);
s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port));
if (!IS_ERR(ourport->baudclk))
clk_disable_unprepare(ourport->baudclk);
clk_disable_unprepare(ourport->clk);
uart_resume_port(&s3c24xx_uart_drv, port);
@ -1964,7 +1968,11 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)
if (rx_enabled(port))
uintm &= ~S3C64XX_UINTM_RXD_MSK;
clk_prepare_enable(ourport->clk);
if (!IS_ERR(ourport->baudclk))
clk_prepare_enable(ourport->baudclk);
wr_regl(port, S3C64XX_UINTM, uintm);
if (!IS_ERR(ourport->baudclk))
clk_disable_unprepare(ourport->baudclk);
clk_disable_unprepare(ourport->clk);
}
}

47
drivers/tty/serial/sc16is7xx.c
View file

@ -328,6 +328,7 @@ struct sc16is7xx_port {
struct kthread_worker kworker;
struct task_struct *kworker_task;
struct kthread_work irq_work;
struct mutex efr_lock;
struct sc16is7xx_one p[0];
};
@ -499,6 +500,21 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud)
div /= 4;
}
/* In an amazing feat of design, the Enhanced Features Register shares
* the address of the Interrupt Identification Register, and is
* switched in by writing a magic value (0xbf) to the Line Control
* Register. Any interrupt firing during this time will see the EFR
* where it expects the IIR to be, leading to "Unexpected interrupt"
* messages.
*
* Prevent this possibility by claiming a mutex while accessing the
* EFR, and claiming the same mutex from within the interrupt handler.
* This is similar to disabling the interrupt, but that doesn't work
* because the bulk of the interrupt processing is run as a workqueue
* job in thread context.
*/
mutex_lock(&s->efr_lock);
lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG);
/* Open the LCR divisors for configuration */
@ -514,6 +530,8 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud)
/* Put LCR back to the normal mode */
sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
mutex_unlock(&s->efr_lock);
sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
SC16IS7XX_MCR_CLKSEL_BIT,
prescaler);
@ -657,7 +675,7 @@ static void sc16is7xx_handle_tx(struct uart_port *port)
uart_write_wakeup(port);
}
static void sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
{
struct uart_port *port = &s->p[portno].port;
@ -666,7 +684,7 @@ static void sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
iir = sc16is7xx_port_read(port, SC16IS7XX_IIR_REG);
if (iir & SC16IS7XX_IIR_NO_INT_BIT)
break;
return false;
iir &= SC16IS7XX_IIR_ID_MASK;
@ -688,16 +706,27 @@ static void sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
port->line, iir);
break;
}
} while (1);
} while (0);
return true;
}
static void sc16is7xx_ist(struct kthread_work *ws)
{
struct sc16is7xx_port *s = to_sc16is7xx_port(ws, irq_work);
int i;
for (i = 0; i < s->devtype->nr_uart; ++i)
sc16is7xx_port_irq(s, i);
mutex_lock(&s->efr_lock);
while (1) {
bool keep_polling = false;
int i;
for (i = 0; i < s->devtype->nr_uart; ++i)
keep_polling |= sc16is7xx_port_irq(s, i);
if (!keep_polling)
break;
}
mutex_unlock(&s->efr_lock);
}
static irqreturn_t sc16is7xx_irq(int irq, void *dev_id)
@ -892,6 +921,9 @@ static void sc16is7xx_set_termios(struct uart_port *port,
if (!(termios->c_cflag & CREAD))
port->ignore_status_mask |= SC16IS7XX_LSR_BRK_ERROR_MASK;
/* As above, claim the mutex while accessing the EFR. */
mutex_lock(&s->efr_lock);
sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
SC16IS7XX_LCR_CONF_MODE_B);
@ -913,6 +945,8 @@ static void sc16is7xx_set_termios(struct uart_port *port,
/* Update LCR register */
sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
mutex_unlock(&s->efr_lock);
/* Get baud rate generator configuration */
baud = uart_get_baud_rate(port, termios, old,
port->uartclk / 16 / 4 / 0xffff,
@ -1178,6 +1212,7 @@ static int sc16is7xx_probe(struct device *dev,
s->regmap = regmap;
s->devtype = devtype;
dev_set_drvdata(dev, s);
mutex_init(&s->efr_lock);
kthread_init_worker(&s->kworker);
kthread_init_work(&s->irq_work, sc16is7xx_ist);

60
drivers/tty/serial/serial_core.c
View file

@ -1302,6 +1302,58 @@ static int uart_set_rs485_config(struct uart_port *port,
return 0;
}
static int uart_get_iso7816_config(struct uart_port *port,
struct serial_iso7816 __user *iso7816)
{
unsigned long flags;
struct serial_iso7816 aux;
if (!port->iso7816_config)
return -ENOIOCTLCMD;
spin_lock_irqsave(&port->lock, flags);
aux = port->iso7816;
spin_unlock_irqrestore(&port->lock, flags);
if (copy_to_user(iso7816, &aux, sizeof(aux)))
return -EFAULT;
return 0;
}
static int uart_set_iso7816_config(struct uart_port *port,
struct serial_iso7816 __user *iso7816_user)
{
struct serial_iso7816 iso7816;
int i, ret;
unsigned long flags;
if (!port->iso7816_config)
return -ENOIOCTLCMD;
if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user)))
return -EFAULT;
/*
* There are 5 words reserved for future use. Check that userspace
* doesn't put stuff in there to prevent breakages in the future.
*/
for (i = 0; i < 5; i++)
if (iso7816.reserved[i])
return -EINVAL;
spin_lock_irqsave(&port->lock, flags);
ret = port->iso7816_config(port, &iso7816);
spin_unlock_irqrestore(&port->lock, flags);
if (ret)
return ret;
if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816)))
return -EFAULT;
return 0;
}
/*
* Called via sys_ioctl. We can use spin_lock_irq() here.
*/
@ -1371,6 +1423,14 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
case TIOCSRS485:
ret = uart_set_rs485_config(uport, uarg);
break;
case TIOCSISO7816:
ret = uart_set_iso7816_config(state->uart_port, uarg);
break;
case TIOCGISO7816:
ret = uart_get_iso7816_config(state->uart_port, uarg);
break;
default:
if (uport->ops->ioctl)
ret = uport->ops->ioctl(uport, cmd, arg);

9
drivers/tty/serial/sh-sci.c
View file

@ -1516,7 +1516,7 @@ static struct dma_chan *sci_request_dma_chan(struct uart_port *port,
chan = dma_request_slave_channel(port->dev,
dir == DMA_MEM_TO_DEV ? "tx" : "rx");
if (!chan) {
dev_warn(port->dev, "dma_request_slave_channel failed\n");
dev_dbg(port->dev, "dma_request_slave_channel failed\n");
return NULL;
}
@ -3414,6 +3414,12 @@ static int __init scif_early_console_setup(struct earlycon_device *device,
{
return early_console_setup(device, PORT_SCIF);
}
static int __init rzscifa_early_console_setup(struct earlycon_device *device,
const char *opt)
{
port_cfg.regtype = SCIx_RZ_SCIFA_REGTYPE;
return early_console_setup(device, PORT_SCIF);
}
static int __init scifa_early_console_setup(struct earlycon_device *device,
const char *opt)
{
@ -3432,6 +3438,7 @@ static int __init hscif_early_console_setup(struct earlycon_device *device,
OF_EARLYCON_DECLARE(sci, "renesas,sci", sci_early_console_setup);
OF_EARLYCON_DECLARE(scif, "renesas,scif", scif_early_console_setup);
OF_EARLYCON_DECLARE(scif, "renesas,scif-r7s9210", rzscifa_early_console_setup);
OF_EARLYCON_DECLARE(scifa, "renesas,scifa", scifa_early_console_setup);
OF_EARLYCON_DECLARE(scifb, "renesas,scifb", scifb_early_console_setup);
OF_EARLYCON_DECLARE(hscif, "renesas,hscif", hscif_early_console_setup);

15
drivers/tty/serial/sn_console.c
View file

@ -888,7 +888,7 @@ sn_sal_console_write(struct console *co, const char *s, unsigned count)
/* somebody really wants this output, might be an
* oops, kdb, panic, etc. make sure they get it. */
if (spin_is_locked(&port->sc_port.lock)) {
if (!spin_trylock_irqsave(&port->sc_port.lock, flags)) {
int lhead = port->sc_port.state->xmit.head;
int ltail = port->sc_port.state->xmit.tail;
int counter, got_lock = 0;
@ -905,13 +905,11 @@ sn_sal_console_write(struct console *co, const char *s, unsigned count)
*/
for (counter = 0; counter < 150; mdelay(125), counter++) {
if (!spin_is_locked(&port->sc_port.lock)
|| stole_lock) {
if (!stole_lock) {
spin_lock_irqsave(&port->sc_port.lock,
flags);
got_lock = 1;
}
if (stole_lock)
break;
if (spin_trylock_irqsave(&port->sc_port.lock, flags)) {
got_lock = 1;
break;
} else {
/* still locked */
@ -938,7 +936,6 @@ sn_sal_console_write(struct console *co, const char *s, unsigned count)
puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
} else {
stole_lock = 0;
spin_lock_irqsave(&port->sc_port.lock, flags);
sn_transmit_chars(port, 1);
spin_unlock_irqrestore(&port->sc_port.lock, flags);

98
drivers/tty/serial/sprd_serial.c
View file

@ -45,6 +45,8 @@
/* data number in TX and RX fifo */
#define SPRD_STS1 0x000C
#define SPRD_RX_FIFO_CNT_MASK GENMASK(7, 0)
#define SPRD_TX_FIFO_CNT_MASK GENMASK(15, 8)
/* interrupt enable register and its BITs */
#define SPRD_IEN 0x0010
@ -66,67 +68,62 @@
#define SPRD_LCR_DATA_LEN6 0x4
#define SPRD_LCR_DATA_LEN7 0x8
#define SPRD_LCR_DATA_LEN8 0xc
#define SPRD_LCR_PARITY (BIT(0) | BIT(1))
#define SPRD_LCR_PARITY (BIT(0) | BIT(1))
#define SPRD_LCR_PARITY_EN 0x2
#define SPRD_LCR_EVEN_PAR 0x0
#define SPRD_LCR_ODD_PAR 0x1
/* control register 1 */
#define SPRD_CTL1 0x001C
#define SPRD_CTL1 0x001C
#define RX_HW_FLOW_CTL_THLD BIT(6)
#define RX_HW_FLOW_CTL_EN BIT(7)
#define TX_HW_FLOW_CTL_EN BIT(8)
#define RX_TOUT_THLD_DEF 0x3E00
#define RX_HFC_THLD_DEF 0x40
#define RX_HFC_THLD_DEF 0x40
/* fifo threshold register */
#define SPRD_CTL2 0x0020
#define THLD_TX_EMPTY 0x40
#define THLD_RX_FULL 0x40
#define THLD_TX_EMPTY 0x40
#define THLD_TX_EMPTY_SHIFT 8
#define THLD_RX_FULL 0x40
/* config baud rate register */
#define SPRD_CLKD0 0x0024
#define SPRD_CLKD0_MASK GENMASK(15, 0)
#define SPRD_CLKD1 0x0028
#define SPRD_CLKD1_MASK GENMASK(20, 16)
#define SPRD_CLKD1_SHIFT 16
/* interrupt mask status register */
#define SPRD_IMSR 0x002C
#define SPRD_IMSR_RX_FIFO_FULL BIT(0)
#define SPRD_IMSR 0x002C
#define SPRD_IMSR_RX_FIFO_FULL BIT(0)
#define SPRD_IMSR_TX_FIFO_EMPTY BIT(1)
#define SPRD_IMSR_BREAK_DETECT BIT(7)
#define SPRD_IMSR_TIMEOUT BIT(13)
struct reg_backup {
u32 ien;
u32 ctrl0;
u32 ctrl1;
u32 ctrl2;
u32 clkd0;
u32 clkd1;
u32 dspwait;
};
#define SPRD_IMSR_BREAK_DETECT BIT(7)
#define SPRD_IMSR_TIMEOUT BIT(13)
struct sprd_uart_port {
struct uart_port port;
struct reg_backup reg_bak;
char name[16];
};
static struct sprd_uart_port *sprd_port[UART_NR_MAX];
static int sprd_ports_num;
static inline unsigned int serial_in(struct uart_port *port, int offset)
static inline unsigned int serial_in(struct uart_port *port,
unsigned int offset)
{
return readl_relaxed(port->membase + offset);
}
static inline void serial_out(struct uart_port *port, int offset, int value)
static inline void serial_out(struct uart_port *port, unsigned int offset,
int value)
{
writel_relaxed(value, port->membase + offset);
}
static unsigned int sprd_tx_empty(struct uart_port *port)
{
if (serial_in(port, SPRD_STS1) & 0xff00)
if (serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
return 0;
else
return TIOCSER_TEMT;
@ -224,14 +221,15 @@ static inline void sprd_rx(struct uart_port *port)
struct tty_port *tty = &port->state->port;
unsigned int ch, flag, lsr, max_count = SPRD_TIMEOUT;
while ((serial_in(port, SPRD_STS1) & 0x00ff) && max_count--) {
while ((serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK) &&
max_count--) {
lsr = serial_in(port, SPRD_LSR);
ch = serial_in(port, SPRD_RXD);
flag = TTY_NORMAL;
port->icount.rx++;
if (lsr & (SPRD_LSR_BI | SPRD_LSR_PE |
SPRD_LSR_FE | SPRD_LSR_OE))
SPRD_LSR_FE | SPRD_LSR_OE))
if (handle_lsr_errors(port, &lsr, &flag))
continue;
if (uart_handle_sysrq_char(port, ch))
@ -294,8 +292,8 @@ static irqreturn_t sprd_handle_irq(int irq, void *dev_id)
if (ims & SPRD_IMSR_TIMEOUT)
serial_out(port, SPRD_ICLR, SPRD_ICLR_TIMEOUT);
if (ims & (SPRD_IMSR_RX_FIFO_FULL |
SPRD_IMSR_BREAK_DETECT | SPRD_IMSR_TIMEOUT))
if (ims & (SPRD_IMSR_RX_FIFO_FULL | SPRD_IMSR_BREAK_DETECT |
SPRD_IMSR_TIMEOUT))
sprd_rx(port);
if (ims & SPRD_IMSR_TX_FIFO_EMPTY)
@ -314,16 +312,17 @@ static int sprd_startup(struct uart_port *port)
struct sprd_uart_port *sp;
unsigned long flags;
serial_out(port, SPRD_CTL2, ((THLD_TX_EMPTY << 8) | THLD_RX_FULL));
serial_out(port, SPRD_CTL2,
THLD_TX_EMPTY << THLD_TX_EMPTY_SHIFT | THLD_RX_FULL);
/* clear rx fifo */
timeout = SPRD_TIMEOUT;
while (timeout-- && serial_in(port, SPRD_STS1) & 0x00ff)
while (timeout-- && serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK)
serial_in(port, SPRD_RXD);
/* clear tx fifo */
timeout = SPRD_TIMEOUT;
while (timeout-- && serial_in(port, SPRD_STS1) & 0xff00)
while (timeout-- && serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
cpu_relax();
/* clear interrupt */
@ -334,7 +333,7 @@ static int sprd_startup(struct uart_port *port)
sp = container_of(port, struct sprd_uart_port, port);
snprintf(sp->name, sizeof(sp->name), "sprd_serial%d", port->line);
ret = devm_request_irq(port->dev, port->irq, sprd_handle_irq,
IRQF_SHARED, sp->name, port);
IRQF_SHARED, sp->name, port);
if (ret) {
dev_err(port->dev, "fail to request serial irq %d, ret=%d\n",
port->irq, ret);
@ -362,8 +361,8 @@ static void sprd_shutdown(struct uart_port *port)
}
static void sprd_set_termios(struct uart_port *port,
struct ktermios *termios,
struct ktermios *old)
struct ktermios *termios,
struct ktermios *old)
{
unsigned int baud, quot;
unsigned int lcr = 0, fc;
@ -444,10 +443,11 @@ static void sprd_set_termios(struct uart_port *port,
}
/* clock divider bit0~bit15 */
serial_out(port, SPRD_CLKD0, quot & 0xffff);
serial_out(port, SPRD_CLKD0, quot & SPRD_CLKD0_MASK);
/* clock divider bit16~bit20 */
serial_out(port, SPRD_CLKD1, (quot & 0x1f0000) >> 16);
serial_out(port, SPRD_CLKD1,
(quot & SPRD_CLKD1_MASK) >> SPRD_CLKD1_SHIFT);
serial_out(port, SPRD_LCR, lcr);
fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
serial_out(port, SPRD_CTL1, fc);
@ -480,8 +480,7 @@ static void sprd_config_port(struct uart_port *port, int flags)
port->type = PORT_SPRD;
}
static int sprd_verify_port(struct uart_port *port,
struct serial_struct *ser)
static int sprd_verify_port(struct uart_port *port, struct serial_struct *ser)
{
if (ser->type != PORT_SPRD)
return -EINVAL;
@ -521,7 +520,7 @@ static void wait_for_xmitr(struct uart_port *port)
if (--tmout == 0)
break;
udelay(1);
} while (status & 0xff00);
} while (status & SPRD_TX_FIFO_CNT_MASK);
}
static void sprd_console_putchar(struct uart_port *port, int ch)
@ -531,7 +530,7 @@ static void sprd_console_putchar(struct uart_port *port, int ch)
}
static void sprd_console_write(struct console *co, const char *s,
unsigned int count)
unsigned int count)
{
struct uart_port *port = &sprd_port[co->index]->port;
int locked = 1;
@ -594,23 +593,21 @@ static void sprd_putc(struct uart_port *port, int c)
unsigned int timeout = SPRD_TIMEOUT;
while (timeout-- &&
!(readl(port->membase + SPRD_LSR) & SPRD_LSR_TX_OVER))
!(readl(port->membase + SPRD_LSR) & SPRD_LSR_TX_OVER))
cpu_relax();
writeb(c, port->membase + SPRD_TXD);
}
static void sprd_early_write(struct console *con, const char *s,
unsigned n)
static void sprd_early_write(struct console *con, const char *s, unsigned int n)
{
struct earlycon_device *dev = con->data;
uart_console_write(&dev->port, s, n, sprd_putc);
}
static int __init sprd_early_console_setup(
struct earlycon_device *device,
const char *opt)
static int __init sprd_early_console_setup(struct earlycon_device *device,
const char *opt)
{
if (!device->port.membase)
return -ENODEV;
@ -692,8 +689,8 @@ static int sprd_probe(struct platform_device *pdev)
index = sprd_probe_dt_alias(index, &pdev->dev);
sprd_port[index] = devm_kzalloc(&pdev->dev,
sizeof(*sprd_port[index]), GFP_KERNEL);
sprd_port[index] = devm_kzalloc(&pdev->dev, sizeof(*sprd_port[index]),
GFP_KERNEL);
if (!sprd_port[index])
return -ENOMEM;
@ -712,15 +709,12 @@ static int sprd_probe(struct platform_device *pdev)
up->uartclk = clk_get_rate(clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "not provide mem resource\n");
return -ENODEV;
}
up->mapbase = res->start;
up->membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(up->membase))
return PTR_ERR(up->membase);
up->mapbase = res->start;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "not provide irq resource: %d\n", irq);

71
drivers/tty/serial/uartlite.c
View file

@ -55,6 +55,11 @@
#define ULITE_CONTROL_RST_RX 0x02
#define ULITE_CONTROL_IE 0x10
/* Static pointer to console port */
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
static struct uart_port *console_port;
#endif
struct uartlite_data {
const struct uartlite_reg_ops *reg_ops;
struct clk *clk;
@ -472,7 +477,7 @@ static void ulite_console_putchar(struct uart_port *port, int ch)
static void ulite_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_port *port = &ulite_ports[co->index];
struct uart_port *port = console_port;
unsigned long flags;
unsigned int ier;
int locked = 1;
@ -506,10 +511,8 @@ static int ulite_console_setup(struct console *co, char *options)
int parity = 'n';
int flow = 'n';
if (co->index < 0 || co->index >= ULITE_NR_UARTS)
return -EINVAL;
port = &ulite_ports[co->index];
port = console_port;
/* Has the device been initialized yet? */
if (!port->mapbase) {
@ -541,14 +544,6 @@ static struct console ulite_console = {
.data = &ulite_uart_driver,
};
static int __init ulite_console_init(void)
{
register_console(&ulite_console);
return 0;
}
console_initcall(ulite_console_init);
static void early_uartlite_putc(struct uart_port *port, int c)
{
/*
@ -660,6 +655,17 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq,
dev_set_drvdata(dev, port);
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
/*
* If console hasn't been found yet try to assign this port
* because it is required to be assigned for console setup function.
* If register_console() don't assign value, then console_port pointer
* is cleanup.
*/
if (ulite_uart_driver.cons->index == -1)
console_port = port;
#endif
/* Register the port */
rc = uart_add_one_port(&ulite_uart_driver, port);
if (rc) {
@ -669,6 +675,12 @@ static int ulite_assign(struct device *dev, int id, u32 base, int irq,
return rc;
}
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
/* This is not port which is used for console that's why clean it up */
if (ulite_uart_driver.cons->index == -1)
console_port = NULL;
#endif
return 0;
}
@ -776,13 +788,26 @@ static int ulite_probe(struct platform_device *pdev)
pdata->clk = NULL;
}
ret = clk_prepare(pdata->clk);
ret = clk_prepare_enable(pdata->clk);
if (ret) {
dev_err(&pdev->dev, "Failed to prepare clock\n");
return ret;
}
return ulite_assign(&pdev->dev, id, res->start, irq, pdata);
if (!ulite_uart_driver.state) {
dev_dbg(&pdev->dev, "uartlite: calling uart_register_driver()\n");
ret = uart_register_driver(&ulite_uart_driver);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register driver\n");
return ret;
}
}
ret = ulite_assign(&pdev->dev, id, res->start, irq, pdata);
clk_disable(pdata->clk);
return ret;
}
static int ulite_remove(struct platform_device *pdev)
@ -813,25 +838,9 @@ static struct platform_driver ulite_platform_driver = {
static int __init ulite_init(void)
{
int ret;
pr_debug("uartlite: calling uart_register_driver()\n");
ret = uart_register_driver(&ulite_uart_driver);
if (ret)
goto err_uart;
pr_debug("uartlite: calling platform_driver_register()\n");
ret = platform_driver_register(&ulite_platform_driver);
if (ret)
goto err_plat;
return 0;
err_plat:
uart_unregister_driver(&ulite_uart_driver);
err_uart:
pr_err("registering uartlite driver failed: err=%i\n", ret);
return ret;
return platform_driver_register(&ulite_platform_driver);
}
static void __exit ulite_exit(void)

299
drivers/tty/serial/xilinx_uartps.c
View file

@ -30,8 +30,6 @@
#define CDNS_UART_TTY_NAME "ttyPS"
#define CDNS_UART_NAME "xuartps"
#define CDNS_UART_MAJOR 0 /* use dynamic node allocation */
#define CDNS_UART_MINOR 0 /* works best with devtmpfs */
#define CDNS_UART_NR_PORTS 2
#define CDNS_UART_FIFO_SIZE 64 /* FIFO size */
#define CDNS_UART_REGISTER_SPACE 0x1000
@ -180,7 +178,9 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
* @port: Pointer to the UART port
* @uartclk: Reference clock
* @pclk: APB clock
* @cdns_uart_driver: Pointer to UART driver
* @baud: Current baud rate
* @id: Port ID
* @clk_rate_change_nb: Notifier block for clock changes
* @quirks: Flags for RXBS support.
*/
@ -188,7 +188,9 @@ struct cdns_uart {
struct uart_port *port;
struct clk *uartclk;
struct clk *pclk;
struct uart_driver *cdns_uart_driver;
unsigned int baud;
int id;
struct notifier_block clk_rate_change_nb;
u32 quirks;
};
@ -1003,13 +1005,12 @@ static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
val = readl(port->membase + CDNS_UART_MODEMCR);
mode_reg = readl(port->membase + CDNS_UART_MR);
val &= ~(CDNS_UART_MODEMCR_RTS | CDNS_UART_MODEMCR_DTR);
val &= ~(CDNS_UART_MODEMCR_RTS | CDNS_UART_MODEMCR_DTR |
CDNS_UART_MODEMCR_FCM);
mode_reg &= ~CDNS_UART_MR_CHMODE_MASK;
if (mctrl & TIOCM_RTS)
val |= CDNS_UART_MODEMCR_RTS;
if (mctrl & TIOCM_DTR)
val |= CDNS_UART_MODEMCR_DTR;
if (mctrl & TIOCM_RTS || mctrl & TIOCM_DTR)
val |= CDNS_UART_MODEMCR_FCM;
if (mctrl & TIOCM_LOOP)
mode_reg |= CDNS_UART_MR_CHMODE_L_LOOP;
else
@ -1217,7 +1218,7 @@ static void cdns_uart_console_write(struct console *co, const char *s,
*
* Return: 0 on success, negative errno otherwise.
*/
static int __init cdns_uart_console_setup(struct console *co, char *options)
static int cdns_uart_console_setup(struct console *co, char *options)
{
struct uart_port *port = console_port;
@ -1237,32 +1238,8 @@ static int __init cdns_uart_console_setup(struct console *co, char *options)
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver cdns_uart_uart_driver;
static struct console cdns_uart_console = {
.name = CDNS_UART_TTY_NAME,
.write = cdns_uart_console_write,
.device = uart_console_device,
.setup = cdns_uart_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1, /* Specified on the cmdline (e.g. console=ttyPS ) */
.data = &cdns_uart_uart_driver,
};
#endif /* CONFIG_SERIAL_XILINX_PS_UART_CONSOLE */
static struct uart_driver cdns_uart_uart_driver = {
.owner = THIS_MODULE,
.driver_name = CDNS_UART_NAME,
.dev_name = CDNS_UART_TTY_NAME,
.major = CDNS_UART_MAJOR,
.minor = CDNS_UART_MINOR,
.nr = CDNS_UART_NR_PORTS,
#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
.cons = &cdns_uart_console,
#endif
};
#ifdef CONFIG_PM_SLEEP
/**
* cdns_uart_suspend - suspend event
@ -1273,24 +1250,12 @@ static struct uart_driver cdns_uart_uart_driver = {
static int cdns_uart_suspend(struct device *device)
{
struct uart_port *port = dev_get_drvdata(device);
struct tty_struct *tty;
struct device *tty_dev;
int may_wake = 0;
struct cdns_uart *cdns_uart = port->private_data;
int may_wake;
/* Get the tty which could be NULL so don't assume it's valid */
tty = tty_port_tty_get(&port->state->port);
if (tty) {
tty_dev = tty->dev;
may_wake = device_may_wakeup(tty_dev);
tty_kref_put(tty);
}
may_wake = device_may_wakeup(device);
/*
* Call the API provided in serial_core.c file which handles
* the suspend.
*/
uart_suspend_port(&cdns_uart_uart_driver, port);
if (!(console_suspend_enabled && !may_wake)) {
if (console_suspend_enabled && may_wake) {
unsigned long flags = 0;
spin_lock_irqsave(&port->lock, flags);
@ -1305,7 +1270,11 @@ static int cdns_uart_suspend(struct device *device)
spin_unlock_irqrestore(&port->lock, flags);
}
return 0;
/*
* Call the API provided in serial_core.c file which handles
* the suspend.
*/
return uart_suspend_port(cdns_uart->cdns_uart_driver, port);
}
/**
@ -1317,23 +1286,14 @@ static int cdns_uart_suspend(struct device *device)
static int cdns_uart_resume(struct device *device)
{
struct uart_port *port = dev_get_drvdata(device);
struct cdns_uart *cdns_uart = port->private_data;
unsigned long flags = 0;
u32 ctrl_reg;
struct tty_struct *tty;
struct device *tty_dev;
int may_wake = 0;
int may_wake;
/* Get the tty which could be NULL so don't assume it's valid */
tty = tty_port_tty_get(&port->state->port);
if (tty) {
tty_dev = tty->dev;
may_wake = device_may_wakeup(tty_dev);
tty_kref_put(tty);
}
may_wake = device_may_wakeup(device);
if (console_suspend_enabled && !may_wake) {
struct cdns_uart *cdns_uart = port->private_data;
clk_enable(cdns_uart->pclk);
clk_enable(cdns_uart->uartclk);
@ -1367,7 +1327,7 @@ static int cdns_uart_resume(struct device *device)
spin_unlock_irqrestore(&port->lock, flags);
}
return uart_resume_port(&cdns_uart_uart_driver, port);
return uart_resume_port(cdns_uart->cdns_uart_driver, port);
}
#endif /* ! CONFIG_PM_SLEEP */
static int __maybe_unused cdns_runtime_suspend(struct device *dev)
@ -1409,6 +1369,90 @@ static const struct of_device_id cdns_uart_of_match[] = {
};
MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
/*
* Maximum number of instances without alias IDs but if there is alias
* which target "< MAX_UART_INSTANCES" range this ID can't be used.
*/
#define MAX_UART_INSTANCES 32
/* Stores static aliases list */
static DECLARE_BITMAP(alias_bitmap, MAX_UART_INSTANCES);
static int alias_bitmap_initialized;
/* Stores actual bitmap of allocated IDs with alias IDs together */
static DECLARE_BITMAP(bitmap, MAX_UART_INSTANCES);
/* Protect bitmap operations to have unique IDs */
static DEFINE_MUTEX(bitmap_lock);
static int cdns_get_id(struct platform_device *pdev)
{
int id, ret;
mutex_lock(&bitmap_lock);
/* Alias list is stable that's why get alias bitmap only once */
if (!alias_bitmap_initialized) {
ret = of_alias_get_alias_list(cdns_uart_of_match, "serial",
alias_bitmap, MAX_UART_INSTANCES);
if (ret && ret != -EOVERFLOW) {
mutex_unlock(&bitmap_lock);
return ret;
}
alias_bitmap_initialized++;
}
/* Make sure that alias ID is not taken by instance without alias */
bitmap_or(bitmap, bitmap, alias_bitmap, MAX_UART_INSTANCES);
dev_dbg(&pdev->dev, "Alias bitmap: %*pb\n",
MAX_UART_INSTANCES, bitmap);
/* Look for a serialN alias */
id = of_alias_get_id(pdev->dev.of_node, "serial");
if (id < 0) {
dev_warn(&pdev->dev,
"No serial alias passed. Using the first free id\n");
/*
* Start with id 0 and check if there is no serial0 alias
* which points to device which is compatible with this driver.
* If alias exists then try next free position.
*/
id = 0;
for (;;) {
dev_info(&pdev->dev, "Checking id %d\n", id);
id = find_next_zero_bit(bitmap, MAX_UART_INSTANCES, id);
/* No free empty instance */
if (id == MAX_UART_INSTANCES) {
dev_err(&pdev->dev, "No free ID\n");
mutex_unlock(&bitmap_lock);
return -EINVAL;
}
dev_dbg(&pdev->dev, "The empty id is %d\n", id);
/* Check if ID is empty */
if (!test_and_set_bit(id, bitmap)) {
/* Break the loop if bit is taken */
dev_dbg(&pdev->dev,
"Selected ID %d allocation passed\n",
id);
break;
}
dev_dbg(&pdev->dev,
"Selected ID %d allocation failed\n", id);
/* if taking bit fails then try next one */
id++;
}
}
mutex_unlock(&bitmap_lock);
return id;
}
/**
* cdns_uart_probe - Platform driver probe
* @pdev: Pointer to the platform device structure
@ -1417,11 +1461,16 @@ MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
*/
static int cdns_uart_probe(struct platform_device *pdev)
{
int rc, id, irq;
int rc, irq;
struct uart_port *port;
struct resource *res;
struct cdns_uart *cdns_uart_data;
const struct of_device_id *match;
struct uart_driver *cdns_uart_uart_driver;
char *driver_name;
#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
struct console *cdns_uart_console;
#endif
cdns_uart_data = devm_kzalloc(&pdev->dev, sizeof(*cdns_uart_data),
GFP_KERNEL);
@ -1431,6 +1480,63 @@ static int cdns_uart_probe(struct platform_device *pdev)
if (!port)
return -ENOMEM;
cdns_uart_uart_driver = devm_kzalloc(&pdev->dev,
sizeof(*cdns_uart_uart_driver),
GFP_KERNEL);
if (!cdns_uart_uart_driver)
return -ENOMEM;
cdns_uart_data->id = cdns_get_id(pdev);
if (cdns_uart_data->id < 0)
return cdns_uart_data->id;
/* There is a need to use unique driver name */
driver_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s%d",
CDNS_UART_NAME, cdns_uart_data->id);
if (!driver_name) {
rc = -ENOMEM;
goto err_out_id;
}
cdns_uart_uart_driver->owner = THIS_MODULE;
cdns_uart_uart_driver->driver_name = driver_name;
cdns_uart_uart_driver->dev_name = CDNS_UART_TTY_NAME;
cdns_uart_uart_driver->major = CDNS_UART_MAJOR;
cdns_uart_uart_driver->minor = cdns_uart_data->id;
cdns_uart_uart_driver->nr = 1;
#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
cdns_uart_console = devm_kzalloc(&pdev->dev, sizeof(*cdns_uart_console),
GFP_KERNEL);
if (!cdns_uart_console)
return -ENOMEM;
strncpy(cdns_uart_console->name, CDNS_UART_TTY_NAME,
sizeof(cdns_uart_console->name));
cdns_uart_console->index = cdns_uart_data->id;
cdns_uart_console->write = cdns_uart_console_write;
cdns_uart_console->device = uart_console_device;
cdns_uart_console->setup = cdns_uart_console_setup;
cdns_uart_console->flags = CON_PRINTBUFFER;
cdns_uart_console->data = cdns_uart_uart_driver;
cdns_uart_uart_driver->cons = cdns_uart_console;
#endif
rc = uart_register_driver(cdns_uart_uart_driver);
if (rc < 0) {
dev_err(&pdev->dev, "Failed to register driver\n");
goto err_out_id;
}
cdns_uart_data->cdns_uart_driver = cdns_uart_uart_driver;
/*
* Setting up proper name_base needs to be done after uart
* registration because tty_driver structure is not filled.
* name_base is 0 by default.
*/
cdns_uart_uart_driver->tty_driver->name_base = cdns_uart_data->id;
match = of_match_node(cdns_uart_of_match, pdev->dev.of_node);
if (match && match->data) {
const struct cdns_platform_data *data = match->data;
@ -1446,7 +1552,8 @@ static int cdns_uart_probe(struct platform_device *pdev)
}
if (IS_ERR(cdns_uart_data->pclk)) {
dev_err(&pdev->dev, "pclk clock not found.\n");
return PTR_ERR(cdns_uart_data->pclk);
rc = PTR_ERR(cdns_uart_data->pclk);
goto err_out_unregister_driver;
}
cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
@ -1457,13 +1564,14 @@ static int cdns_uart_probe(struct platform_device *pdev)
}
if (IS_ERR(cdns_uart_data->uartclk)) {
dev_err(&pdev->dev, "uart_clk clock not found.\n");
return PTR_ERR(cdns_uart_data->uartclk);
rc = PTR_ERR(cdns_uart_data->uartclk);
goto err_out_unregister_driver;
}
rc = clk_prepare_enable(cdns_uart_data->pclk);
if (rc) {
dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
return rc;
goto err_out_unregister_driver;
}
rc = clk_prepare_enable(cdns_uart_data->uartclk);
if (rc) {
@ -1490,28 +1598,14 @@ static int cdns_uart_probe(struct platform_device *pdev)
&cdns_uart_data->clk_rate_change_nb))
dev_warn(&pdev->dev, "Unable to register clock notifier.\n");
#endif
/* Look for a serialN alias */
id = of_alias_get_id(pdev->dev.of_node, "serial");
if (id < 0)
id = 0;
if (id >= CDNS_UART_NR_PORTS) {
dev_err(&pdev->dev, "Cannot get uart_port structure\n");
rc = -ENODEV;
goto err_out_notif_unreg;
}
/* At this point, we've got an empty uart_port struct, initialize it */
spin_lock_init(&port->lock);
port->membase = NULL;
port->irq = 0;
port->type = PORT_UNKNOWN;
port->iotype = UPIO_MEM32;
port->flags = UPF_BOOT_AUTOCONF;
port->ops = &cdns_uart_ops;
port->fifosize = CDNS_UART_FIFO_SIZE;
port->line = id;
port->dev = NULL;
/*
* Register the port.
@ -1538,11 +1632,11 @@ static int cdns_uart_probe(struct platform_device *pdev)
* If register_console() don't assign value, then console_port pointer
* is cleanup.
*/
if (cdns_uart_uart_driver.cons->index == -1)
if (!console_port)
console_port = port;
#endif
rc = uart_add_one_port(&cdns_uart_uart_driver, port);
rc = uart_add_one_port(cdns_uart_uart_driver, port);
if (rc) {
dev_err(&pdev->dev,
"uart_add_one_port() failed; err=%i\n", rc);
@ -1551,7 +1645,8 @@ static int cdns_uart_probe(struct platform_device *pdev)
#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
/* This is not port which is used for console that's why clean it up */
if (cdns_uart_uart_driver.cons->index == -1)
if (console_port == port &&
!(cdns_uart_uart_driver->cons->flags & CON_ENABLED))
console_port = NULL;
#endif
@ -1561,7 +1656,6 @@ err_out_pm_disable:
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
err_out_notif_unreg:
#ifdef CONFIG_COMMON_CLK
clk_notifier_unregister(cdns_uart_data->uartclk,
&cdns_uart_data->clk_rate_change_nb);
@ -1570,7 +1664,13 @@ err_out_clk_disable:
clk_disable_unprepare(cdns_uart_data->uartclk);
err_out_clk_dis_pclk:
clk_disable_unprepare(cdns_uart_data->pclk);
err_out_unregister_driver:
uart_unregister_driver(cdns_uart_data->cdns_uart_driver);
err_out_id:
mutex_lock(&bitmap_lock);
if (cdns_uart_data->id < MAX_UART_INSTANCES)
clear_bit(cdns_uart_data->id, bitmap);
mutex_unlock(&bitmap_lock);
return rc;
}
@ -1591,13 +1691,24 @@ static int cdns_uart_remove(struct platform_device *pdev)
clk_notifier_unregister(cdns_uart_data->uartclk,
&cdns_uart_data->clk_rate_change_nb);
#endif
rc = uart_remove_one_port(&cdns_uart_uart_driver, port);
rc = uart_remove_one_port(cdns_uart_data->cdns_uart_driver, port);
port->mapbase = 0;
mutex_lock(&bitmap_lock);
if (cdns_uart_data->id < MAX_UART_INSTANCES)
clear_bit(cdns_uart_data->id, bitmap);
mutex_unlock(&bitmap_lock);
clk_disable_unprepare(cdns_uart_data->uartclk);
clk_disable_unprepare(cdns_uart_data->pclk);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
if (console_port == port)
console_port = NULL;
#endif
uart_unregister_driver(cdns_uart_data->cdns_uart_driver);
return rc;
}
@ -1613,28 +1724,14 @@ static struct platform_driver cdns_uart_platform_driver = {
static int __init cdns_uart_init(void)
{
int retval = 0;
/* Register the cdns_uart driver with the serial core */
retval = uart_register_driver(&cdns_uart_uart_driver);
if (retval)
return retval;
/* Register the platform driver */
retval = platform_driver_register(&cdns_uart_platform_driver);
if (retval)
uart_unregister_driver(&cdns_uart_uart_driver);
return retval;
return platform_driver_register(&cdns_uart_platform_driver);
}
static void __exit cdns_uart_exit(void)
{
/* Unregister the platform driver */
platform_driver_unregister(&cdns_uart_platform_driver);
/* Unregister the cdns_uart driver */
uart_unregister_driver(&cdns_uart_uart_driver);
}
arch_initcall(cdns_uart_init);

13
drivers/tty/tty_buffer.c
View file

@ -118,9 +118,12 @@ void tty_buffer_free_all(struct tty_port *port)
struct tty_bufhead *buf = &port->buf;
struct tty_buffer *p, *next;
struct llist_node *llist;
unsigned int freed = 0;
int still_used;
while ((p = buf->head) != NULL) {
buf->head = p->next;
freed += p->size;
if (p->size > 0)
kfree(p);
}
@ -132,7 +135,9 @@ void tty_buffer_free_all(struct tty_port *port)
buf->head = &buf->sentinel;
buf->tail = &buf->sentinel;
atomic_set(&buf->mem_used, 0);
still_used = atomic_xchg(&buf->mem_used, 0);
WARN(still_used != freed, "we still have not freed %d bytes!",
still_used - freed);
}
/**
@ -468,11 +473,15 @@ receive_buf(struct tty_port *port, struct tty_buffer *head, int count)
{
unsigned char *p = char_buf_ptr(head, head->read);
char *f = NULL;
int n;
if (~head->flags & TTYB_NORMAL)
f = flag_buf_ptr(head, head->read);
return port->client_ops->receive_buf(port, p, f, count);
n = port->client_ops->receive_buf(port, p, f, count);
if (n > 0)
memset(p, 0, n);
return n;
}
/**

2
drivers/tty/tty_io.c
View file

@ -409,7 +409,7 @@ struct tty_driver *tty_find_polling_driver(char *name, int *line)
mutex_lock(&tty_mutex);
/* Search through the tty devices to look for a match */
list_for_each_entry(p, &tty_drivers, tty_drivers) {
if (strncmp(name, p->name, len) != 0)
if (!len || strncmp(name, p->name, len) != 0)
continue;
stp = str;
if (*stp == ',')

7
drivers/tty/tty_port.c
View file

@ -279,7 +279,6 @@ EXPORT_SYMBOL(tty_port_put);
* Return a refcount protected tty instance or NULL if the port is not
* associated with a tty (eg due to close or hangup)
*/
struct tty_struct *tty_port_tty_get(struct tty_port *port)
{
unsigned long flags;
@ -300,7 +299,6 @@ EXPORT_SYMBOL(tty_port_tty_get);
* Associate the port and tty pair. Manages any internal refcounts.
* Pass NULL to deassociate a port
*/
void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
{
unsigned long flags;
@ -343,7 +341,6 @@ out:
*
* Caller holds tty lock.
*/
void tty_port_hangup(struct tty_port *port)
{
struct tty_struct *tty;
@ -399,7 +396,6 @@ EXPORT_SYMBOL_GPL(tty_port_tty_wakeup);
* to hide some internal details. This will eventually become entirely
* internal to the tty port.
*/
int tty_port_carrier_raised(struct tty_port *port)
{
if (port->ops->carrier_raised == NULL)
@ -416,7 +412,6 @@ EXPORT_SYMBOL(tty_port_carrier_raised);
* to hide some internal details. This will eventually become entirely
* internal to the tty port.
*/
void tty_port_raise_dtr_rts(struct tty_port *port)
{
if (port->ops->dtr_rts)
@ -432,7 +427,6 @@ EXPORT_SYMBOL(tty_port_raise_dtr_rts);
* to hide some internal details. This will eventually become entirely
* internal to the tty port.
*/
void tty_port_lower_dtr_rts(struct tty_port *port)
{
if (port->ops->dtr_rts)
@ -464,7 +458,6 @@ EXPORT_SYMBOL(tty_port_lower_dtr_rts);
* NB: May drop and reacquire tty lock when blocking, so tty and tty_port
* may have changed state (eg., may have been hung up).
*/
int tty_port_block_til_ready(struct tty_port *port,
struct tty_struct *tty, struct file *filp)
{