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path: root/drivers/tty/serial/8250/8250_port.c
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Diffstat (limited to 'drivers/tty/serial/8250/8250_port.c')
-rw-r--r--drivers/tty/serial/8250/8250_port.c71
1 files changed, 36 insertions, 35 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index d4036038a4dd..7481b95c6d84 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -527,13 +527,13 @@ static void serial8250_clear_fifos(struct uart_8250_port *p)
static inline void serial8250_em485_rts_after_send(struct uart_8250_port *p)
{
- unsigned char mcr = serial_in(p, UART_MCR);
+ unsigned char mcr = serial8250_in_MCR(p);
if (p->port.rs485.flags & SER_RS485_RTS_AFTER_SEND)
mcr |= UART_MCR_RTS;
else
mcr &= ~UART_MCR_RTS;
- serial_out(p, UART_MCR, mcr);
+ serial8250_out_MCR(p, mcr);
}
static void serial8250_em485_handle_start_tx(unsigned long arg);
@@ -785,10 +785,10 @@ static int size_fifo(struct uart_8250_port *up)
old_lcr = serial_in(up, UART_LCR);
serial_out(up, UART_LCR, 0);
old_fcr = serial_in(up, UART_FCR);
- old_mcr = serial_in(up, UART_MCR);
+ old_mcr = serial8250_in_MCR(up);
serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
- serial_out(up, UART_MCR, UART_MCR_LOOP);
+ serial8250_out_MCR(up, UART_MCR_LOOP);
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
old_dl = serial_dl_read(up);
serial_dl_write(up, 0x0001);
@@ -800,7 +800,7 @@ static int size_fifo(struct uart_8250_port *up)
(count < 256); count++)
serial_in(up, UART_RX);
serial_out(up, UART_FCR, old_fcr);
- serial_out(up, UART_MCR, old_mcr);
+ serial8250_out_MCR(up, old_mcr);
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_A);
serial_dl_write(up, old_dl);
serial_out(up, UART_LCR, old_lcr);
@@ -1040,17 +1040,17 @@ static void autoconfig_16550a(struct uart_8250_port *up)
* it's changed. If so, set baud_base in EXCR2 to 921600. -- dwmw2
*/
serial_out(up, UART_LCR, 0);
- status1 = serial_in(up, UART_MCR);
+ status1 = serial8250_in_MCR(up);
serial_out(up, UART_LCR, 0xE0);
status2 = serial_in(up, 0x02); /* EXCR1 */
if (!((status2 ^ status1) & UART_MCR_LOOP)) {
serial_out(up, UART_LCR, 0);
- serial_out(up, UART_MCR, status1 ^ UART_MCR_LOOP);
+ serial8250_out_MCR(up, status1 ^ UART_MCR_LOOP);
serial_out(up, UART_LCR, 0xE0);
status2 = serial_in(up, 0x02); /* EXCR1 */
serial_out(up, UART_LCR, 0);
- serial_out(up, UART_MCR, status1);
+ serial8250_out_MCR(up, status1);
if ((status2 ^ status1) & UART_MCR_LOOP) {
unsigned short quot;
@@ -1224,7 +1224,7 @@ static void autoconfig(struct uart_8250_port *up)
}
}
- save_mcr = serial_in(up, UART_MCR);
+ save_mcr = serial8250_in_MCR(up);
save_lcr = serial_in(up, UART_LCR);
/*
@@ -1237,9 +1237,9 @@ static void autoconfig(struct uart_8250_port *up)
* that conflicts with COM 1-4 --- we hope!
*/
if (!(port->flags & UPF_SKIP_TEST)) {
- serial_out(up, UART_MCR, UART_MCR_LOOP | 0x0A);
+ serial8250_out_MCR(up, UART_MCR_LOOP | 0x0A);
status1 = serial_in(up, UART_MSR) & 0xF0;
- serial_out(up, UART_MCR, save_mcr);
+ serial8250_out_MCR(up, save_mcr);
if (status1 != 0x90) {
spin_unlock_irqrestore(&port->lock, flags);
DEBUG_AUTOCONF("LOOP test failed (%02x) ",
@@ -1305,7 +1305,7 @@ static void autoconfig(struct uart_8250_port *up)
if (port->type == PORT_RSA)
serial_out(up, UART_RSA_FRR, 0);
#endif
- serial_out(up, UART_MCR, save_mcr);
+ serial8250_out_MCR(up, save_mcr);
serial8250_clear_fifos(up);
serial_in(up, UART_RX);
if (up->capabilities & UART_CAP_UUE)
@@ -1353,19 +1353,18 @@ static void autoconfig_irq(struct uart_8250_port *up)
/* forget possible initially masked and pending IRQ */
probe_irq_off(probe_irq_on());
- save_mcr = serial_in(up, UART_MCR);
+ save_mcr = serial8250_in_MCR(up);
save_ier = serial_in(up, UART_IER);
- serial_out(up, UART_MCR, UART_MCR_OUT1 | UART_MCR_OUT2);
+ serial8250_out_MCR(up, UART_MCR_OUT1 | UART_MCR_OUT2);
irqs = probe_irq_on();
- serial_out(up, UART_MCR, 0);
+ serial8250_out_MCR(up, 0);
udelay(10);
if (port->flags & UPF_FOURPORT) {
- serial_out(up, UART_MCR,
- UART_MCR_DTR | UART_MCR_RTS);
+ serial8250_out_MCR(up, UART_MCR_DTR | UART_MCR_RTS);
} else {
- serial_out(up, UART_MCR,
- UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
+ serial8250_out_MCR(up,
+ UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2);
}
serial_out(up, UART_IER, 0x0f); /* enable all intrs */
serial_in(up, UART_LSR);
@@ -1376,7 +1375,7 @@ static void autoconfig_irq(struct uart_8250_port *up)
udelay(20);
irq = probe_irq_off(irqs);
- serial_out(up, UART_MCR, save_mcr);
+ serial8250_out_MCR(up, save_mcr);
serial_out(up, UART_IER, save_ier);
if (port->flags & UPF_FOURPORT)
@@ -1549,14 +1548,14 @@ static inline void start_tx_rs485(struct uart_port *port)
del_timer(&em485->stop_tx_timer);
em485->active_timer = NULL;
- mcr = serial_in(up, UART_MCR);
+ mcr = serial8250_in_MCR(up);
if (!!(up->port.rs485.flags & SER_RS485_RTS_ON_SEND) !=
!!(mcr & UART_MCR_RTS)) {
if (up->port.rs485.flags & SER_RS485_RTS_ON_SEND)
mcr |= UART_MCR_RTS;
else
mcr &= ~UART_MCR_RTS;
- serial_out(up, UART_MCR, mcr);
+ serial8250_out_MCR(up, mcr);
if (up->port.rs485.delay_rts_before_send > 0) {
em485->active_timer = &em485->start_tx_timer;
@@ -1619,6 +1618,8 @@ static void serial8250_disable_ms(struct uart_port *port)
if (up->bugs & UART_BUG_NOMSR)
return;
+ mctrl_gpio_disable_ms(up->gpios);
+
up->ier &= ~UART_IER_MSI;
serial_port_out(port, UART_IER, up->ier);
}
@@ -1631,6 +1632,8 @@ static void serial8250_enable_ms(struct uart_port *port)
if (up->bugs & UART_BUG_NOMSR)
return;
+ mctrl_gpio_enable_ms(up->gpios);
+
up->ier |= UART_IER_MSI;
serial8250_rpm_get(up);
@@ -1686,7 +1689,7 @@ static void serial8250_read_char(struct uart_8250_port *up, unsigned char lsr)
lsr &= port->read_status_mask;
if (lsr & UART_LSR_BI) {
- DEBUG_INTR("handling break....");
+ pr_debug("%s: handling break\n", __func__);
flag = TTY_BREAK;
} else if (lsr & UART_LSR_PE)
flag = TTY_PARITY;
@@ -1757,7 +1760,7 @@ void serial8250_tx_chars(struct uart_8250_port *up)
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
- DEBUG_INTR("THRE...");
+ pr_debug("%s: THRE\n", __func__);
/*
* With RPM enabled, we have to wait until the FIFO is empty before the
@@ -1823,7 +1826,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
status = serial_port_in(port, UART_LSR);
- DEBUG_INTR("status = %x...", status);
+ pr_debug("%s: status = %x\n", __func__, status);
if (status & (UART_LSR_DR | UART_LSR_BI)) {
if (!up->dma || handle_rx_dma(up, iir))
@@ -1861,7 +1864,6 @@ static int serial8250_default_handle_irq(struct uart_port *port)
*/
static int exar_handle_irq(struct uart_port *port)
{
- unsigned char int0, int1, int2, int3;
unsigned int iir = serial_port_in(port, UART_IIR);
int ret;
@@ -1869,10 +1871,10 @@ static int exar_handle_irq(struct uart_port *port)
if ((port->type == PORT_XR17V35X) ||
(port->type == PORT_XR17D15X)) {
- int0 = serial_port_in(port, 0x80);
- int1 = serial_port_in(port, 0x81);
- int2 = serial_port_in(port, 0x82);
- int3 = serial_port_in(port, 0x83);
+ serial_port_in(port, 0x80);
+ serial_port_in(port, 0x81);
+ serial_port_in(port, 0x82);
+ serial_port_in(port, 0x83);
}
return ret;
@@ -1915,7 +1917,8 @@ unsigned int serial8250_do_get_mctrl(struct uart_port *port)
ret |= TIOCM_DSR;
if (status & UART_MSR_CTS)
ret |= TIOCM_CTS;
- return ret;
+
+ return mctrl_gpio_get(up->gpios, &ret);
}
EXPORT_SYMBOL_GPL(serial8250_do_get_mctrl);
@@ -1944,7 +1947,7 @@ void serial8250_do_set_mctrl(struct uart_port *port, unsigned int mctrl)
mcr = (mcr & up->mcr_mask) | up->mcr_force | up->mcr;
- serial_port_out(port, UART_MCR, mcr);
+ serial8250_out_MCR(up, mcr);
}
EXPORT_SYMBOL_GPL(serial8250_do_set_mctrl);
@@ -1994,8 +1997,6 @@ static void wait_for_xmitr(struct uart_8250_port *up, int bits)
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
- unsigned int tmout;
-
for (tmout = 1000000; tmout; tmout--) {
unsigned int msr = serial_in(up, UART_MSR);
up->msr_saved_flags |= msr & MSR_SAVE_FLAGS;
@@ -3093,7 +3094,7 @@ static void serial8250_console_restore(struct uart_8250_port *up)
serial8250_set_divisor(port, baud, quot, frac);
serial_port_out(port, UART_LCR, up->lcr);
- serial_port_out(port, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
+ serial8250_out_MCR(up, UART_MCR_DTR | UART_MCR_RTS);
}
/*
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.