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-rw-r--r--drivers/tty/serial/8250/8250_core.c17
-rw-r--r--drivers/tty/serial/Kconfig12
-rw-r--r--drivers/tty/serial/Makefile1
-rw-r--r--drivers/tty/serial/earlycon-riscv-sbi.c28
-rw-r--r--drivers/tty/serial/fsl_lpuart.c2
-rw-r--r--drivers/tty/serial/lantiq.c36
-rw-r--r--drivers/tty/serial/qcom_geni_serial.c4
-rw-r--r--drivers/tty/serial/serial_core.c12
8 files changed, 80 insertions, 32 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 189ab1212d9a..e441221e04b9 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1070,15 +1070,16 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
ret = 0;
}
- }
- /* Initialise interrupt backoff work if required */
- if (up->overrun_backoff_time_ms > 0) {
- uart->overrun_backoff_time_ms = up->overrun_backoff_time_ms;
- INIT_DELAYED_WORK(&uart->overrun_backoff,
- serial_8250_overrun_backoff_work);
- } else {
- uart->overrun_backoff_time_ms = 0;
+ /* Initialise interrupt backoff work if required */
+ if (up->overrun_backoff_time_ms > 0) {
+ uart->overrun_backoff_time_ms =
+ up->overrun_backoff_time_ms;
+ INIT_DELAYED_WORK(&uart->overrun_backoff,
+ serial_8250_overrun_backoff_work);
+ } else {
+ uart->overrun_backoff_time_ms = 0;
+ }
}
mutex_unlock(&serial_mutex);
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 67b9bf3b500e..089a6f285d5e 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -85,6 +85,18 @@ config SERIAL_EARLYCON_ARM_SEMIHOST
with "earlycon=smh" on the kernel command line. The console is
enabled when early_param is processed.
+config SERIAL_EARLYCON_RISCV_SBI
+ bool "Early console using RISC-V SBI"
+ depends on RISCV
+ select SERIAL_CORE
+ select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
+ help
+ Support for early debug console using RISC-V SBI. This enables
+ the console before standard serial driver is probed. This is enabled
+ with "earlycon=sbi" on the kernel command line. The console is
+ enabled when early_param is processed.
+
config SERIAL_SB1250_DUART
tristate "BCM1xxx on-chip DUART serial support"
depends on SIBYTE_SB1xxx_SOC=y
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 8c303736b7e8..1511e8a9f856 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_SERIAL_CORE) += serial_core.o
obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o
obj-$(CONFIG_SERIAL_EARLYCON_ARM_SEMIHOST) += earlycon-arm-semihost.o
+obj-$(CONFIG_SERIAL_EARLYCON_RISCV_SBI) += earlycon-riscv-sbi.o
# These Sparc drivers have to appear before others such as 8250
# which share ttySx minor node space. Otherwise console device
diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c
new file mode 100644
index 000000000000..e1a551aae336
--- /dev/null
+++ b/drivers/tty/serial/earlycon-riscv-sbi.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RISC-V SBI based earlycon
+ *
+ * Copyright (C) 2018 Anup Patel <anup@brainfault.org>
+ */
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <asm/sbi.h>
+
+static void sbi_console_write(struct console *con,
+ const char *s, unsigned int n)
+{
+ int i;
+
+ for (i = 0; i < n; ++i)
+ sbi_console_putchar(s[i]);
+}
+
+static int __init early_sbi_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ device->con->write = sbi_console_write;
+ return 0;
+}
+EARLYCON_DECLARE(sbi, early_sbi_setup);
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 241a48e5052c..debdd1b9e01a 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1697,7 +1697,7 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
}
/* ask the core to calculate the divisor */
- baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
+ baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 4);
spin_lock_irqsave(&sport->port.lock, flags);
diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index e052b69ceb98..9de9f0f239a1 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -114,9 +114,9 @@ struct ltq_uart_port {
static inline void asc_update_bits(u32 clear, u32 set, void __iomem *reg)
{
- u32 tmp = readl(reg);
+ u32 tmp = __raw_readl(reg);
- writel((tmp & ~clear) | set, reg);
+ __raw_writel((tmp & ~clear) | set, reg);
}
static inline struct
@@ -144,7 +144,7 @@ lqasc_start_tx(struct uart_port *port)
static void
lqasc_stop_rx(struct uart_port *port)
{
- writel(ASCWHBSTATE_CLRREN, port->membase + LTQ_ASC_WHBSTATE);
+ __raw_writel(ASCWHBSTATE_CLRREN, port->membase + LTQ_ASC_WHBSTATE);
}
static int
@@ -153,11 +153,12 @@ lqasc_rx_chars(struct uart_port *port)
struct tty_port *tport = &port->state->port;
unsigned int ch = 0, rsr = 0, fifocnt;
- fifocnt = readl(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_RXFFLMASK;
+ fifocnt = __raw_readl(port->membase + LTQ_ASC_FSTAT) &
+ ASCFSTAT_RXFFLMASK;
while (fifocnt--) {
u8 flag = TTY_NORMAL;
ch = readb(port->membase + LTQ_ASC_RBUF);
- rsr = (readl(port->membase + LTQ_ASC_STATE)
+ rsr = (__raw_readl(port->membase + LTQ_ASC_STATE)
& ASCSTATE_ANY) | UART_DUMMY_UER_RX;
tty_flip_buffer_push(tport);
port->icount.rx++;
@@ -217,7 +218,7 @@ lqasc_tx_chars(struct uart_port *port)
return;
}
- while (((readl(port->membase + LTQ_ASC_FSTAT) &
+ while (((__raw_readl(port->membase + LTQ_ASC_FSTAT) &
ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF) != 0) {
if (port->x_char) {
writeb(port->x_char, port->membase + LTQ_ASC_TBUF);
@@ -245,7 +246,7 @@ lqasc_tx_int(int irq, void *_port)
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
- writel(ASC_IRNCR_TIR, port->membase + LTQ_ASC_IRNCR);
+ __raw_writel(ASC_IRNCR_TIR, port->membase + LTQ_ASC_IRNCR);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
lqasc_start_tx(port);
return IRQ_HANDLED;
@@ -270,7 +271,7 @@ lqasc_rx_int(int irq, void *_port)
unsigned long flags;
struct uart_port *port = (struct uart_port *)_port;
spin_lock_irqsave(&ltq_asc_lock, flags);
- writel(ASC_IRNCR_RIR, port->membase + LTQ_ASC_IRNCR);
+ __raw_writel(ASC_IRNCR_RIR, port->membase + LTQ_ASC_IRNCR);
lqasc_rx_chars(port);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
return IRQ_HANDLED;
@@ -280,7 +281,8 @@ static unsigned int
lqasc_tx_empty(struct uart_port *port)
{
int status;
- status = readl(port->membase + LTQ_ASC_FSTAT) & ASCFSTAT_TXFFLMASK;
+ status = __raw_readl(port->membase + LTQ_ASC_FSTAT) &
+ ASCFSTAT_TXFFLMASK;
return status ? 0 : TIOCSER_TEMT;
}
@@ -313,12 +315,12 @@ lqasc_startup(struct uart_port *port)
asc_update_bits(ASCCLC_DISS | ASCCLC_RMCMASK, (1 << ASCCLC_RMCOFFSET),
port->membase + LTQ_ASC_CLC);
- writel(0, port->membase + LTQ_ASC_PISEL);
- writel(
+ __raw_writel(0, port->membase + LTQ_ASC_PISEL);
+ __raw_writel(
((TXFIFO_FL << ASCTXFCON_TXFITLOFF) & ASCTXFCON_TXFITLMASK) |
ASCTXFCON_TXFEN | ASCTXFCON_TXFFLU,
port->membase + LTQ_ASC_TXFCON);
- writel(
+ __raw_writel(
((RXFIFO_FL << ASCRXFCON_RXFITLOFF) & ASCRXFCON_RXFITLMASK)
| ASCRXFCON_RXFEN | ASCRXFCON_RXFFLU,
port->membase + LTQ_ASC_RXFCON);
@@ -350,7 +352,7 @@ lqasc_startup(struct uart_port *port)
goto err2;
}
- writel(ASC_IRNREN_RX | ASC_IRNREN_ERR | ASC_IRNREN_TX,
+ __raw_writel(ASC_IRNREN_RX | ASC_IRNREN_ERR | ASC_IRNREN_TX,
port->membase + LTQ_ASC_IRNREN);
return 0;
@@ -369,7 +371,7 @@ lqasc_shutdown(struct uart_port *port)
free_irq(ltq_port->rx_irq, port);
free_irq(ltq_port->err_irq, port);
- writel(0, port->membase + LTQ_ASC_CON);
+ __raw_writel(0, port->membase + LTQ_ASC_CON);
asc_update_bits(ASCRXFCON_RXFEN, ASCRXFCON_RXFFLU,
port->membase + LTQ_ASC_RXFCON);
asc_update_bits(ASCTXFCON_TXFEN, ASCTXFCON_TXFFLU,
@@ -461,13 +463,13 @@ lqasc_set_termios(struct uart_port *port,
asc_update_bits(ASCCON_BRS, 0, port->membase + LTQ_ASC_CON);
/* now we can write the new baudrate into the register */
- writel(divisor, port->membase + LTQ_ASC_BG);
+ __raw_writel(divisor, port->membase + LTQ_ASC_BG);
/* turn the baudrate generator back on */
asc_update_bits(0, ASCCON_R, port->membase + LTQ_ASC_CON);
/* enable rx */
- writel(ASCWHBSTATE_SETREN, port->membase + LTQ_ASC_WHBSTATE);
+ __raw_writel(ASCWHBSTATE_SETREN, port->membase + LTQ_ASC_WHBSTATE);
spin_unlock_irqrestore(&ltq_asc_lock, flags);
@@ -578,7 +580,7 @@ lqasc_console_putchar(struct uart_port *port, int ch)
return;
do {
- fifofree = (readl(port->membase + LTQ_ASC_FSTAT)
+ fifofree = (__raw_readl(port->membase + LTQ_ASC_FSTAT)
& ASCFSTAT_TXFREEMASK) >> ASCFSTAT_TXFREEOFF;
} while (fifofree == 0);
writeb(ch, port->membase + LTQ_ASC_TBUF);
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
index a72d6d9fb983..38016609c7fa 100644
--- a/drivers/tty/serial/qcom_geni_serial.c
+++ b/drivers/tty/serial/qcom_geni_serial.c
@@ -225,7 +225,7 @@ static unsigned int qcom_geni_serial_get_mctrl(struct uart_port *uport)
unsigned int mctrl = TIOCM_DSR | TIOCM_CAR;
u32 geni_ios;
- if (uart_console(uport) || !uart_cts_enabled(uport)) {
+ if (uart_console(uport)) {
mctrl |= TIOCM_CTS;
} else {
geni_ios = readl_relaxed(uport->membase + SE_GENI_IOS);
@@ -241,7 +241,7 @@ static void qcom_geni_serial_set_mctrl(struct uart_port *uport,
{
u32 uart_manual_rfr = 0;
- if (uart_console(uport) || !uart_cts_enabled(uport))
+ if (uart_console(uport))
return;
if (!(mctrl & TIOCM_RTS))
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index d4cca5bdaf1c..5c01bb6d1c24 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -550,10 +550,12 @@ static int uart_put_char(struct tty_struct *tty, unsigned char c)
int ret = 0;
circ = &state->xmit;
- if (!circ->buf)
+ port = uart_port_lock(state, flags);
+ if (!circ->buf) {
+ uart_port_unlock(port, flags);
return 0;
+ }
- port = uart_port_lock(state, flags);
if (port && uart_circ_chars_free(circ) != 0) {
circ->buf[circ->head] = c;
circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);
@@ -586,11 +588,13 @@ static int uart_write(struct tty_struct *tty,
return -EL3HLT;
}
+ port = uart_port_lock(state, flags);
circ = &state->xmit;
- if (!circ->buf)
+ if (!circ->buf) {
+ uart_port_unlock(port, flags);
return 0;
+ }
- port = uart_port_lock(state, flags);
while (port) {
c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
if (count < c)
generated by cgit (git 2.34.1) at 2024-06-28 18:21:41 +0000