Skip to content

L
linux
Commit 157c0342 authored by Russell King's avatar Russell King
Browse files
Options

[SERIAL] Add ARM PL011 uart primecell support. 

This adds support for the AMBA PL011 UART primecell, and moves the
existing AMBA UART support to indicate it covers the AMBA PL010
primecell.
parent 51af77db
Hide whitespace changes
Inline Side-by-side
Showing with 1282 additions and 268 deletions
arch/arm/kernel/debug.S
View file @ 157c0342
......@@ -315,7 +315,7 @@
#elif defined(CONFIG_ARCH_INTEGRATOR)
#include <asm/hardware/serial_amba.h>
#include <asm/hardware/amba_serial.h>
.macro addruart,rx
mrc p15, 0, \rx, c1, c0
......@@ -326,7 +326,7 @@
.endm
.macro senduart,rd,rx
strb \rd, [\rx, #AMBA_UARTDR]
strb \rd, [\rx, #UART01x_DR]
.endm
.macro waituart,rd,rx
......
drivers/serial/Kconfig
View file @ 157c0342
......@@ -174,19 +174,19 @@ config SERIAL_8250_ACORN
system, say Y to this option. The driver can handle 1, 2, or 3 port
cards. If unsure, say N.
config SERIAL_AMBA
tristate "ARM AMBA serial port support"
config SERIAL_AMBA_PL010
tristate "ARM AMBA PL010 serial port support"
depends on ARM_AMBA
select SERIAL_CORE
help
This selects the ARM(R) AMBA(R) PrimeCell UART. If you have an
Integrator platform, say Y or M here.
This selects the ARM(R) AMBA(R) PrimeCell PL010 UART. If you have
an Integrator/AP or Integrator/PP2 platform, say Y or M here.
If unsure, say N.
config SERIAL_AMBA_CONSOLE
config SERIAL_AMBA_PL010_CONSOLE
bool "Support for console on AMBA serial port"
depends on SERIAL_AMBA=y
depends on SERIAL_AMBA_PL010=y
select SERIAL_CORE_CONSOLE
---help---
Say Y here if you wish to use an AMBA PrimeCell UART as the system
......@@ -200,10 +200,32 @@ config SERIAL_AMBA_CONSOLE
your boot loader (lilo or loadlin) about how to pass options to the
kernel at boot time.)
config SERIAL_INTEGRATOR
bool
depends on SERIAL_AMBA && ARCH_INTEGRATOR
default y
config SERIAL_AMBA_PL011
tristate "ARM AMBA PL011 serial port support"
depends on ARM_AMBA
select SERIAL_CORE
help
This selects the ARM(R) AMBA(R) PrimeCell PL010 UART. If you have
an Integrator/PP2, Integrator/CP or Versatile platform, say Y or M
here.
If unsure, say N.
config SERIAL_AMBA_PL011_CONSOLE
bool "Support for console on AMBA serial port"
depends on SERIAL_AMBA_PL011=y
select SERIAL_CORE_CONSOLE
---help---
Say Y here if you wish to use an AMBA PrimeCell UART as the system
console (the system console is the device which receives all kernel
messages and warnings and which allows logins in single user mode).
Even if you say Y here, the currently visible framebuffer console
(/dev/tty0) will still be used as the system console by default, but
you can alter that using a kernel command line option such as
"console=ttyAM0". (Try "man bootparam" or see the documentation of
your boot loader (lilo or loadlin) about how to pass options to the
kernel at boot time.)
config SERIAL_CLPS711X
tristate "CLPS711X serial port support"
......
drivers/serial/Makefile
View file @ 157c0342
......@@ -16,7 +16,8 @@ obj-$(CONFIG_SERIAL_21285) += 21285.o
obj-$(CONFIG_SERIAL_8250) += 8250.o $(serial-8250-y)
obj-$(CONFIG_SERIAL_8250_CS) += serial_cs.o
obj-$(CONFIG_SERIAL_8250_ACORN) += 8250_acorn.o
obj-$(CONFIG_SERIAL_AMBA) += amba.o
obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
obj-$(CONFIG_SERIAL_PXA) += pxa.o
obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
......
drivers/serial/amba.c → drivers/serial/amba-pl010.c
View file @ 157c0342
......@@ -43,14 +43,15 @@
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware/amba.h>
#if defined(CONFIG_SERIAL_AMBA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#include <asm/hardware/serial_amba.h>
#include <asm/hardware/amba_serial.h>
#define UART_NR 2
......@@ -63,25 +64,25 @@
/*
* Access macros for the AMBA UARTs
*/
#define UART_GET_INT_STATUS(p) readb((p)->membase + AMBA_UARTIIR)
#define UART_PUT_ICR(p, c) writel((c), (p)->membase + AMBA_UARTICR)
#define UART_GET_FR(p) readb((p)->membase + AMBA_UARTFR)
#define UART_GET_CHAR(p) readb((p)->membase + AMBA_UARTDR)
#define UART_PUT_CHAR(p, c) writel((c), (p)->membase + AMBA_UARTDR)
#define UART_GET_RSR(p) readb((p)->membase + AMBA_UARTRSR)
#define UART_GET_CR(p) readb((p)->membase + AMBA_UARTCR)
#define UART_PUT_CR(p,c) writel((c), (p)->membase + AMBA_UARTCR)
#define UART_GET_LCRL(p) readb((p)->membase + AMBA_UARTLCR_L)
#define UART_PUT_LCRL(p,c) writel((c), (p)->membase + AMBA_UARTLCR_L)
#define UART_GET_LCRM(p) readb((p)->membase + AMBA_UARTLCR_M)
#define UART_PUT_LCRM(p,c) writel((c), (p)->membase + AMBA_UARTLCR_M)
#define UART_GET_LCRH(p) readb((p)->membase + AMBA_UARTLCR_H)
#define UART_PUT_LCRH(p,c) writel((c), (p)->membase + AMBA_UARTLCR_H)
#define UART_RX_DATA(s) (((s) & AMBA_UARTFR_RXFE) == 0)
#define UART_TX_READY(s) (((s) & AMBA_UARTFR_TXFF) == 0)
#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & AMBA_UARTFR_TMSK) == 0)
#define UART_DUMMY_RSR_RX 256
#define UART_GET_INT_STATUS(p) readb((p)->membase + UART010_IIR)
#define UART_PUT_ICR(p, c) writel((c), (p)->membase + UART010_ICR)
#define UART_GET_FR(p) readb((p)->membase + UART01x_FR)
#define UART_GET_CHAR(p) readb((p)->membase + UART01x_DR)
#define UART_PUT_CHAR(p, c) writel((c), (p)->membase + UART01x_DR)
#define UART_GET_RSR(p) readb((p)->membase + UART01x_RSR)
#define UART_GET_CR(p) readb((p)->membase + UART010_CR)
#define UART_PUT_CR(p,c) writel((c), (p)->membase + UART010_CR)
#define UART_GET_LCRL(p) readb((p)->membase + UART010_LCRL)
#define UART_PUT_LCRL(p,c) writel((c), (p)->membase + UART010_LCRL)
#define UART_GET_LCRM(p) readb((p)->membase + UART010_LCRM)
#define UART_PUT_LCRM(p,c) writel((c), (p)->membase + UART010_LCRM)
#define UART_GET_LCRH(p) readb((p)->membase + UART010_LCRH)
#define UART_PUT_LCRH(p,c) writel((c), (p)->membase + UART010_LCRH)
#define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0)
#define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0)
#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART01x_FR_TMSK) == 0)
#define UART_DUMMY_RSR_RX /*256*/0
#define UART_PORT_SIZE 64
/*
......@@ -104,47 +105,47 @@ struct uart_amba_port {
unsigned int old_status;
};
static void ambauart_stop_tx(struct uart_port *port, unsigned int tty_stop)
static void pl010_stop_tx(struct uart_port *port, unsigned int tty_stop)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr &= ~AMBA_UARTCR_TIE;
cr &= ~UART010_CR_TIE;
UART_PUT_CR(port, cr);
}
static void ambauart_start_tx(struct uart_port *port, unsigned int tty_start)
static void pl010_start_tx(struct uart_port *port, unsigned int tty_start)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr |= AMBA_UARTCR_TIE;
cr |= UART010_CR_TIE;
UART_PUT_CR(port, cr);
}
static void ambauart_stop_rx(struct uart_port *port)
static void pl010_stop_rx(struct uart_port *port)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr &= ~(AMBA_UARTCR_RIE | AMBA_UARTCR_RTIE);
cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
UART_PUT_CR(port, cr);
}
static void ambauart_enable_ms(struct uart_port *port)
static void pl010_enable_ms(struct uart_port *port)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr |= AMBA_UARTCR_MSIE;
cr |= UART010_CR_MSIE;
UART_PUT_CR(port, cr);
}
static void
#ifdef SUPPORT_SYSRQ
ambauart_rx_chars(struct uart_port *port, struct pt_regs *regs)
pl010_rx_chars(struct uart_port *port, struct pt_regs *regs)
#else
ambauart_rx_chars(struct uart_port *port)
pl010_rx_chars(struct uart_port *port)
#endif
{
struct tty_struct *tty = port->info->tty;
......@@ -171,26 +172,26 @@ ambauart_rx_chars(struct uart_port *port)
* out of the main execution path
*/
rsr = UART_GET_RSR(port) | UART_DUMMY_RSR_RX;
if (rsr & AMBA_UARTRSR_ANY) {
if (rsr & AMBA_UARTRSR_BE) {
rsr &= ~(AMBA_UARTRSR_FE | AMBA_UARTRSR_PE);
if (rsr & UART01x_RSR_ANY) {
if (rsr & UART01x_RSR_BE) {
rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
port->icount.brk++;
if (uart_handle_break(port))
goto ignore_char;
} else if (rsr & AMBA_UARTRSR_PE)
} else if (rsr & UART01x_RSR_PE)
port->icount.parity++;
else if (rsr & AMBA_UARTRSR_FE)
else if (rsr & UART01x_RSR_FE)
port->icount.frame++;
if (rsr & AMBA_UARTRSR_OE)
if (rsr & UART01x_RSR_OE)
port->icount.overrun++;
rsr &= port->read_status_mask;
if (rsr & AMBA_UARTRSR_BE)
if (rsr & UART01x_RSR_BE)
*tty->flip.flag_buf_ptr = TTY_BREAK;
else if (rsr & AMBA_UARTRSR_PE)
else if (rsr & UART01x_RSR_PE)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (rsr & AMBA_UARTRSR_FE)
else if (rsr & UART01x_RSR_FE)
*tty->flip.flag_buf_ptr = TTY_FRAME;
}
......@@ -202,7 +203,7 @@ ambauart_rx_chars(struct uart_port *port)
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
if ((rsr & AMBA_UARTRSR_OE) &&
if ((rsr & UART01x_RSR_OE) &&
tty->flip.count < TTY_FLIPBUF_SIZE) {
/*
* Overrun is special, since it's reported
......@@ -220,7 +221,7 @@ ambauart_rx_chars(struct uart_port *port)
return;
}
static void ambauart_tx_chars(struct uart_port *port)
static void pl010_tx_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->info->xmit;
int count;
......@@ -232,7 +233,7 @@ static void ambauart_tx_chars(struct uart_port *port)
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
ambauart_stop_tx(port, 0);
pl010_stop_tx(port, 0);
return;
}
......@@ -249,17 +250,17 @@ static void ambauart_tx_chars(struct uart_port *port)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
ambauart_stop_tx(port, 0);
pl010_stop_tx(port, 0);
}
static void ambauart_modem_status(struct uart_port *port)
static void pl010_modem_status(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int status, delta;
UART_PUT_ICR(&uap->port, 0);
status = UART_GET_FR(&uap->port) & AMBA_UARTFR_MODEM_ANY;
status = UART_GET_FR(&uap->port) & UART01x_FR_MODEM_ANY;
delta = status ^ uap->old_status;
uap->old_status = status;
......@@ -267,68 +268,76 @@ static void ambauart_modem_status(struct uart_port *port)
if (!delta)
return;
if (delta & AMBA_UARTFR_DCD)
uart_handle_dcd_change(&uap->port, status & AMBA_UARTFR_DCD);
if (delta & UART01x_FR_DCD)
uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
if (delta & AMBA_UARTFR_DSR)
if (delta & UART01x_FR_DSR)
uap->port.icount.dsr++;
if (delta & AMBA_UARTFR_CTS)
uart_handle_cts_change(&uap->port, status & AMBA_UARTFR_CTS);
if (delta & UART01x_FR_CTS)
uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
wake_up_interruptible(&uap->port.info->delta_msr_wait);
}
static irqreturn_t ambauart_int(int irq, void *dev_id, struct pt_regs *regs)
static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_port *port = dev_id;
unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
int handled = 0;
spin_lock(&port->lock);
status = UART_GET_INT_STATUS(port);
do {
if (status & (AMBA_UARTIIR_RTIS | AMBA_UARTIIR_RIS))
if (status) {
do {
if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
#ifdef SUPPORT_SYSRQ
ambauart_rx_chars(port, regs);
pl010_rx_chars(port, regs);
#else
ambauart_rx_chars(port);
pl010_rx_chars(port);
#endif
if (status & AMBA_UARTIIR_MIS)
ambauart_modem_status(port);
if (status & AMBA_UARTIIR_TIS)
ambauart_tx_chars(port);
if (pass_counter-- == 0)
break;
if (status & UART010_IIR_MIS)
pl010_modem_status(port);
if (status & UART010_IIR_TIS)
pl010_tx_chars(port);
if (pass_counter-- == 0)
break;
status = UART_GET_INT_STATUS(port);
} while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
UART010_IIR_TIS));
handled = 1;
}
status = UART_GET_INT_STATUS(port);
} while (status & (AMBA_UARTIIR_RTIS | AMBA_UARTIIR_RIS |
AMBA_UARTIIR_TIS));
spin_unlock(&port->lock);
return IRQ_HANDLED;
return IRQ_RETVAL(handled);
}
static unsigned int ambauart_tx_empty(struct uart_port *port)
static unsigned int pl010_tx_empty(struct uart_port *port)
{
return UART_GET_FR(port) & AMBA_UARTFR_BUSY ? 0 : TIOCSER_TEMT;
return UART_GET_FR(port) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
}
static unsigned int ambauart_get_mctrl(struct uart_port *port)
static unsigned int pl010_get_mctrl(struct uart_port *port)
{
unsigned int result = 0;
unsigned int status;
status = UART_GET_FR(port);
if (status & AMBA_UARTFR_DCD)
if (status & UART01x_FR_DCD)
result |= TIOCM_CAR;
if (status & AMBA_UARTFR_DSR)
if (status & UART01x_FR_DSR)
result |= TIOCM_DSR;
if (status & AMBA_UARTFR_CTS)
if (status & UART01x_FR_CTS)
result |= TIOCM_CTS;
return result;
}
static void ambauart_set_mctrl(struct uart_port *port, unsigned int mctrl)
static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int ctrls = 0, ctrlc = 0;
......@@ -347,7 +356,7 @@ static void ambauart_set_mctrl(struct uart_port *port, unsigned int mctrl)
__raw_writel(ctrlc, SC_CTRLC);
}
static void ambauart_break_ctl(struct uart_port *port, int break_state)
static void pl010_break_ctl(struct uart_port *port, int break_state)
{
unsigned long flags;
unsigned int lcr_h;
......@@ -355,14 +364,14 @@ static void ambauart_break_ctl(struct uart_port *port, int break_state)
spin_lock_irqsave(&port->lock, flags);
lcr_h = UART_GET_LCRH(port);
if (break_state == -1)
lcr_h |= AMBA_UARTLCR_H_BRK;
lcr_h |= UART01x_LCRH_BRK;
else
lcr_h &= ~AMBA_UARTLCR_H_BRK;
lcr_h &= ~UART01x_LCRH_BRK;
UART_PUT_LCRH(port, lcr_h);
spin_unlock_irqrestore(&port->lock, flags);
}
static int ambauart_startup(struct uart_port *port)
static int pl010_startup(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
int retval;
......@@ -370,25 +379,25 @@ static int ambauart_startup(struct uart_port *port)
/*
* Allocate the IRQ
*/
retval = request_irq(port->irq, ambauart_int, 0, "amba", port);
retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", port);
if (retval)
return retval;
/*
* initialise the old status of the modem signals
*/
uap->old_status = UART_GET_FR(port) & AMBA_UARTFR_MODEM_ANY;
uap->old_status = UART_GET_FR(port) & UART01x_FR_MODEM_ANY;
/*
* Finally, enable interrupts
*/
UART_PUT_CR(port, AMBA_UARTCR_UARTEN | AMBA_UARTCR_RIE |
AMBA_UARTCR_RTIE);
UART_PUT_CR(port, UART01x_CR_UARTEN | UART010_CR_RIE |
UART010_CR_RTIE);
return 0;
}
static void ambauart_shutdown(struct uart_port *port)
static void pl010_shutdown(struct uart_port *port)
{
/*
* Free the interrupt
......@@ -402,11 +411,11 @@ static void ambauart_shutdown(struct uart_port *port)
/* disable break condition and fifos */
UART_PUT_LCRH(port, UART_GET_LCRH(port) &
~(AMBA_UARTLCR_H_BRK | AMBA_UARTLCR_H_FEN));
~(UART01x_LCRH_BRK | UART01x_LCRH_FEN));
}
static void
ambauart_set_termios(struct uart_port *port, struct termios *termios,
pl010_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
unsigned int lcr_h, old_cr;
......@@ -421,27 +430,27 @@ ambauart_set_termios(struct uart_port *port, struct termios *termios,
switch (termios->c_cflag & CSIZE) {
case CS5:
lcr_h = AMBA_UARTLCR_H_WLEN_5;
lcr_h = UART01x_LCRH_WLEN_5;
break;
case CS6:
lcr_h = AMBA_UARTLCR_H_WLEN_6;
lcr_h = UART01x_LCRH_WLEN_6;
break;
case CS7:
lcr_h = AMBA_UARTLCR_H_WLEN_7;
lcr_h = UART01x_LCRH_WLEN_7;
break;
default: // CS8
lcr_h = AMBA_UARTLCR_H_WLEN_8;
lcr_h = UART01x_LCRH_WLEN_8;
break;
}
if (termios->c_cflag & CSTOPB)
lcr_h |= AMBA_UARTLCR_H_STP2;
lcr_h |= UART01x_LCRH_STP2;
if (termios->c_cflag & PARENB) {
lcr_h |= AMBA_UARTLCR_H_PEN;
lcr_h |= UART01x_LCRH_PEN;
if (!(termios->c_cflag & PARODD))
lcr_h |= AMBA_UARTLCR_H_EPS;
lcr_h |= UART01x_LCRH_EPS;
}
if (port->fifosize > 1)
lcr_h |= AMBA_UARTLCR_H_FEN;
lcr_h |= UART01x_LCRH_FEN;
spin_lock_irqsave(&port->lock, flags);
......@@ -450,26 +459,26 @@ ambauart_set_termios(struct uart_port *port, struct termios *termios,
*/
uart_update_timeout(port, termios->c_cflag, baud);
port->read_status_mask = AMBA_UARTRSR_OE;
port->read_status_mask = UART01x_RSR_OE;
if (termios->c_iflag & INPCK)
port->read_status_mask |= AMBA_UARTRSR_FE | AMBA_UARTRSR_PE;
port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
if (termios->c_iflag & (BRKINT | PARMRK))
port->read_status_mask |= AMBA_UARTRSR_BE;
port->read_status_mask |= UART01x_RSR_BE;
/*
* Characters to ignore
*/
port->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= AMBA_UARTRSR_FE | AMBA_UARTRSR_PE;
port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
if (termios->c_iflag & IGNBRK) {
port->ignore_status_mask |= AMBA_UARTRSR_BE;
port->ignore_status_mask |= UART01x_RSR_BE;
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= AMBA_UARTRSR_OE;
port->ignore_status_mask |= UART01x_RSR_OE;
}
/*
......@@ -479,10 +488,10 @@ ambauart_set_termios(struct uart_port *port, struct termios *termios,
port->ignore_status_mask |= UART_DUMMY_RSR_RX;
/* first, disable everything */
old_cr = UART_GET_CR(port) & ~AMBA_UARTCR_MSIE;
old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE;
if (UART_ENABLE_MS(port, termios->c_cflag))
old_cr |= AMBA_UARTCR_MSIE;
old_cr |= UART010_CR_MSIE;
UART_PUT_CR(port, 0);
......@@ -502,7 +511,7 @@ ambauart_set_termios(struct uart_port *port, struct termios *termios,
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *ambauart_type(struct uart_port *port)
static const char *pl010_type(struct uart_port *port)
{
return port->type == PORT_AMBA ? "AMBA" : NULL;
}
......@@ -510,7 +519,7 @@ static const char *ambauart_type(struct uart_port *port)
/*
* Release the memory region(s) being used by 'port'
*/
static void ambauart_release_port(struct uart_port *port)
static void pl010_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, UART_PORT_SIZE);
}
......@@ -518,27 +527,27 @@ static void ambauart_release_port(struct uart_port *port)
/*
* Request the memory region(s) being used by 'port'
*/
static int ambauart_request_port(struct uart_port *port)
static int pl010_request_port(struct uart_port *port)
{
return request_mem_region(port->mapbase, UART_PORT_SIZE, "serial_amba")
return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
!= NULL ? 0 : -EBUSY;
}
/*
* Configure/autoconfigure the port.
*/
static void ambauart_config_port(struct uart_port *port, int flags)
static void pl010_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE) {
port->type = PORT_AMBA;
ambauart_request_port(port);
pl010_request_port(port);
}
}
/*
* verify the new serial_struct (for TIOCSSERIAL).
*/
static int ambauart_verify_port(struct uart_port *port, struct serial_struct *ser)
static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
......@@ -550,23 +559,23 @@ static int ambauart_verify_port(struct uart_port *port, struct serial_struct *se
return ret;
}
static struct uart_ops amba_pops = {
.tx_empty = ambauart_tx_empty,
.set_mctrl = ambauart_set_mctrl,
.get_mctrl = ambauart_get_mctrl,
.stop_tx = ambauart_stop_tx,
.start_tx = ambauart_start_tx,
.stop_rx = ambauart_stop_rx,
.enable_ms = ambauart_enable_ms,
.break_ctl = ambauart_break_ctl,
.startup = ambauart_startup,
.shutdown = ambauart_shutdown,
.set_termios = ambauart_set_termios,
.type = ambauart_type,
.release_port = ambauart_release_port,
.request_port = ambauart_request_port,
.config_port = ambauart_config_port,
.verify_port = ambauart_verify_port,
static struct uart_ops amba_pl010_pops = {
.tx_empty = pl010_tx_empty,
.set_mctrl = pl010_set_mctrl,
.get_mctrl = pl010_get_mctrl,
.stop_tx = pl010_stop_tx,
.start_tx = pl010_start_tx,
.stop_rx = pl010_stop_rx,
.enable_ms = pl010_enable_ms,
.break_ctl = pl010_break_ctl,
.startup = pl010_startup,
.shutdown = pl010_shutdown,
.set_termios = pl010_set_termios,
.type = pl010_type,
.release_port = pl010_release_port,
.request_port = pl010_request_port,
.config_port = pl010_config_port,
.verify_port = pl010_verify_port,
};
static struct uart_amba_port amba_ports[UART_NR] = {
......@@ -578,7 +587,7 @@ static struct uart_amba_port amba_ports[UART_NR] = {
.irq = IRQ_UARTINT0,
.uartclk = 14745600,
.fifosize = 16,
.ops = &amba_pops,
.ops = &amba_pl010_pops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
......@@ -593,7 +602,7 @@ static struct uart_amba_port amba_ports[UART_NR] = {
.irq = IRQ_UARTINT1,
.uartclk = 14745600,
.fifosize = 16,
.ops = &amba_pops,
.ops = &amba_pl010_pops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
......@@ -602,10 +611,10 @@ static struct uart_amba_port amba_ports[UART_NR] = {
}
};
#ifdef CONFIG_SERIAL_AMBA_CONSOLE
#ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
static void
ambauart_console_write(struct console *co, const char *s, unsigned int count)
pl010_console_write(struct console *co, const char *s, unsigned int count)
{
struct uart_port *port = &amba_ports[co->index].port;
unsigned int status, old_cr;
......@@ -615,7 +624,7 @@ ambauart_console_write(struct console *co, const char *s, unsigned int count)
* First save the CR then disable the interrupts
*/
old_cr = UART_GET_CR(port);
UART_PUT_CR(port, AMBA_UARTCR_UARTEN);
UART_PUT_CR(port, UART01x_CR_UARTEN);
/*
* Now, do each character
......@@ -639,27 +648,27 @@ ambauart_console_write(struct console *co, const char *s, unsigned int count)
*/
do {
status = UART_GET_FR(port);
} while (status & AMBA_UARTFR_BUSY);
} while (status & UART01x_FR_BUSY);
UART_PUT_CR(port, old_cr);
}
static void __init
ambauart_console_get_options(struct uart_port *port, int *baud,
pl010_console_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
if (UART_GET_CR(port) & AMBA_UARTCR_UARTEN) {
if (UART_GET_CR(port) & UART01x_CR_UARTEN) {
unsigned int lcr_h, quot;
lcr_h = UART_GET_LCRH(port);
*parity = 'n';
if (lcr_h & AMBA_UARTLCR_H_PEN) {
if (lcr_h & AMBA_UARTLCR_H_EPS)
if (lcr_h & UART01x_LCRH_PEN) {
if (lcr_h & UART01x_LCRH_EPS)
*parity = 'e';
else
*parity = 'o';
}
if ((lcr_h & 0x60) == AMBA_UARTLCR_H_WLEN_7)
if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
*bits = 7;
else
*bits = 8;
......@@ -669,7 +678,7 @@ ambauart_console_get_options(struct uart_port *port, int *baud,
}
}
static int __init ambauart_console_setup(struct console *co, char *options)
static int __init pl010_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 38400;
......@@ -689,7 +698,7 @@ static int __init ambauart_console_setup(struct console *co, char *options)
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
ambauart_console_get_options(port, &baud, &parity, &bits);
pl010_console_get_options(port, &baud, &parity, &bits);
return uart_set_options(port, co, baud, parity, bits, flow);
}
......@@ -697,21 +706,14 @@ static int __init ambauart_console_setup(struct console *co, char *options)
extern struct uart_driver amba_reg;
static struct console amba_console = {
.name = "ttyAM",
.write = ambauart_console_write,
.write = pl010_console_write,
.device = uart_console_device,
.setup = ambauart_console_setup,
.setup = pl010_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &amba_reg,
};
static int __init ambauart_console_init(void)
{
register_console(&amba_console);
return 0;
}
console_initcall(ambauart_console_init);
#define AMBA_CONSOLE &amba_console
#else
#define AMBA_CONSOLE NULL
......@@ -727,7 +729,75 @@ static struct uart_driver amba_reg = {
.cons = AMBA_CONSOLE,
};
static int __init ambauart_init(void)
static int pl010_probe(struct amba_device *dev, void *id)
{
int i;
for (i = 0; i < UART_NR; i++) {
if (amba_ports[i].port.mapbase != dev->res.start)
continue;
amba_ports[i].port.dev = &dev->dev;
uart_add_one_port(&amba_reg, &amba_ports[i].port);
amba_set_drvdata(dev, &amba_ports[i]);
break;
}
return 0;
}
static int pl010_remove(struct amba_device *dev)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
if (uap)
uart_remove_one_port(&amba_reg, &uap->port);
amba_set_drvdata(dev, NULL);
return 0;
}
static int pl010_suspend(struct amba_device *dev, u32 state)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
if (uap)
uart_suspend_port(&amba_reg, &uap->port);
return 0;
}
static int pl010_resume(struct amba_device *dev)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
if (uap)
uart_resume_port(&amba_reg, &uap->port);
return 0;
}
static struct amba_id pl010_ids[] __initdata = {
{
.id = 0x00041010,
.mask = 0x000fffff,
},
{ 0, 0 },
};
static struct amba_driver pl010_driver = {
.drv = {
.name = "uart-pl010",
},
.id_table = pl010_ids,
.probe = pl010_probe,
.remove = pl010_remove,
.suspend = pl010_suspend,
.resume = pl010_resume,
};
static int __init pl010_init(void)
{
int ret;
......@@ -735,28 +805,22 @@ static int __init ambauart_init(void)
ret = uart_register_driver(&amba_reg);
if (ret == 0) {
int i;
for (i = 0; i < UART_NR; i++)
uart_add_one_port(&amba_reg, &amba_ports[i].port);
ret = amba_driver_register(&pl010_driver);
if (ret)
uart_unregister_driver(&amba_reg);
}
return ret;
}
static void __exit ambauart_exit(void)
static void __exit pl010_exit(void)
{
int i;
for (i = 0; i < UART_NR; i++)
uart_remove_one_port(&amba_reg, &amba_ports[i].port);
amba_driver_unregister(&pl010_driver);
uart_unregister_driver(&amba_reg);
}
module_init(ambauart_init);
module_exit(ambauart_exit);
module_init(pl010_init);
module_exit(pl010_exit);
MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV(SERIAL_AMBA_MAJOR, SERIAL_AMBA_MINOR);
drivers/serial/amba-pl011.c 0 → 100644
View file @ 157c0342
/*
* linux/drivers/char/amba.c
*
* Driver for AMBA serial ports
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
*
* Copyright 1999 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: amba.c,v 1.41 2002/07/28 10:03:27 rmk Exp $
*
* This is a generic driver for ARM AMBA-type serial ports. They
* have a lot of 16550-like features, but are not register compatible.
* Note that although they do have CTS, DCD and DSR inputs, they do
* not have an RI input, nor do they have DTR or RTS outputs. If
* required, these have to be supplied via some other means (eg, GPIO)
* and hooked into this driver.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware/amba.h>
#include <asm/hardware/clock.h>
#if defined(CONFIG_SERIAL_AMBA_PL011_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#include <asm/hardware/amba_serial.h>
#define UART_NR 14
#define SERIAL_AMBA_MAJOR 204
#define SERIAL_AMBA_MINOR 64
#define SERIAL_AMBA_NR UART_NR
#define AMBA_ISR_PASS_LIMIT 256
#define UART_DUMMY_RSR_RX 256
/*
* We wrap our port structure around the generic uart_port.
*/
struct uart_amba_port {
struct uart_port port;
struct clk *clk;
unsigned int im; /* interrupt mask */
unsigned int old_status;
};
static void pl011_stop_tx(struct uart_port *port, unsigned int tty_stop)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
uap->im &= ~UART011_TXIM;
writew(uap->im, uap->port.membase + UART011_IMSC);
}
static void pl011_start_tx(struct uart_port *port, unsigned int tty_start)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
uap->im |= UART011_TXIM;
writew(uap->im, uap->port.membase + UART011_IMSC);
}
static void pl011_stop_rx(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
uap->im &= ~(UART011_RXIM|UART011_RTIM|UART011_FEIM|
UART011_PEIM|UART011_BEIM|UART011_OEIM);
writew(uap->im, uap->port.membase + UART011_IMSC);
}
static void pl011_enable_ms(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
uap->im |= UART011_RIMIM|UART011_CTSMIM|UART011_DCDMIM|UART011_DSRMIM;
writew(uap->im, uap->port.membase + UART011_IMSC);
}
static void
#ifdef SUPPORT_SYSRQ
pl011_rx_chars(struct uart_amba_port *uap, struct pt_regs *regs)
#else
pl011_rx_chars(struct uart_amba_port *uap)
#endif
{
struct tty_struct *tty = uap->port.info->tty;
unsigned int status, ch, rsr, max_count = 256;
status = readw(uap->port.membase + UART01x_FR);
while ((status & UART01x_FR_RXFE) == 0 && max_count--) {
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty->flip.work.func((void *)tty);
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
printk(KERN_WARNING "TTY_DONT_FLIP set\n");
return;
}
}
ch = readw(uap->port.membase + UART01x_DR);
*tty->flip.char_buf_ptr = ch;
*tty->flip.flag_buf_ptr = TTY_NORMAL;
uap->port.icount.rx++;
/*
* Note that the error handling code is
* out of the main execution path
*/
rsr = readw(uap->port.membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
if (rsr & UART01x_RSR_ANY) {
if (rsr & UART01x_RSR_BE) {
rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
uap->port.icount.brk++;
if (uart_handle_break(&uap->port))
goto ignore_char;
} else if (rsr & UART01x_RSR_PE)
uap->port.icount.parity++;
else if (rsr & UART01x_RSR_FE)
uap->port.icount.frame++;
if (rsr & UART01x_RSR_OE)
uap->port.icount.overrun++;
rsr &= uap->port.read_status_mask;
if (rsr & UART01x_RSR_BE)
*tty->flip.flag_buf_ptr = TTY_BREAK;
else if (rsr & UART01x_RSR_PE)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (rsr & UART01x_RSR_FE)
*tty->flip.flag_buf_ptr = TTY_FRAME;
}
if (uart_handle_sysrq_char(&uap->port, ch, regs))
goto ignore_char;
if ((rsr & uap->port.ignore_status_mask) == 0) {
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
if ((rsr & UART01x_RSR_OE) &&
tty->flip.count < TTY_FLIPBUF_SIZE) {
/*
* Overrun is special, since it's reported
* immediately, and doesn't affect the current
* character
*/
*tty->flip.char_buf_ptr++ = 0;
*tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
tty->flip.count++;
}
ignore_char:
status = readw(uap->port.membase + UART01x_FR);
}
tty_flip_buffer_push(tty);
return;
}
static void pl011_tx_chars(struct uart_amba_port *uap)
{
struct circ_buf *xmit = &uap->port.info->xmit;
int count;
if (uap->port.x_char) {
writew(uap->port.x_char, uap->port.membase + UART01x_DR);
uap->port.icount.tx++;
uap->port.x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) {
pl011_stop_tx(&uap->port, 0);
return;
}
count = uap->port.fifosize >> 1;
do {
writew(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
uap->port.icount.tx++;
if (uart_circ_empty(xmit))
break;
} while (--count > 0);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&uap->port);
if (uart_circ_empty(xmit))
pl011_stop_tx(&uap->port, 0);
}
static void pl011_modem_status(struct uart_amba_port *uap)
{
unsigned int status, delta;
status = readw(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
delta = status ^ uap->old_status;
uap->old_status = status;
if (!delta)
return;
if (delta & UART01x_FR_DCD)
uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
if (delta & UART01x_FR_DSR)
uap->port.icount.dsr++;
if (delta & UART01x_FR_CTS)
uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
wake_up_interruptible(&uap->port.info->delta_msr_wait);
}
static irqreturn_t pl011_int(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_amba_port *uap = dev_id;
unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
int handled = 0;
spin_lock(&uap->port.lock);
status = readw(uap->port.membase + UART011_MIS);
if (status) {
do {
writew(status & ~(UART011_TXIS|UART011_RTIS|
UART011_RXIS),
uap->port.membase + UART011_ICR);
if (status & (UART011_RTIS|UART011_RXIS))
#ifdef SUPPORT_SYSRQ
pl011_rx_chars(uap, regs);
#else
pl011_rx_chars(uap);
#endif
if (status & (UART011_DSRMIS|UART011_DCDMIS|
UART011_CTSMIS|UART011_RIMIS))
pl011_modem_status(uap);
if (status & UART011_TXIS)
pl011_tx_chars(uap);
if (pass_counter-- == 0)
break;
status = readw(uap->port.membase + UART011_MIS);
} while (status != 0);
handled = 1;
}
spin_unlock(&uap->port.lock);
return IRQ_RETVAL(handled);
}
static unsigned int pl01x_tx_empty(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int status = readw(uap->port.membase + UART01x_FR);
return status & (UART01x_FR_BUSY|UART01x_FR_TXFF) ? 0 : TIOCSER_TEMT;
}
static unsigned int pl01x_get_mctrl(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int result = 0;
unsigned int status = readw(uap->port.membase + UART01x_FR);
#define BIT(uartbit, tiocmbit) \
if (status & uartbit) \
result |= tiocmbit
BIT(UART01x_FR_DCD, TIOCM_CAR);
BIT(UART01x_FR_DSR, TIOCM_DSR);
BIT(UART01x_FR_CTS, TIOCM_CTS);
BIT(UART011_FR_RI, TIOCM_RNG);
#undef BIT
return result;
}
static void pl011_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int cr;
cr = readw(uap->port.membase + UART011_CR);
#define BIT(tiocmbit, uartbit) \
if (mctrl & tiocmbit) \
cr |= uartbit; \
else \
cr &= ~uartbit
BIT(TIOCM_RTS, UART011_CR_RTS);
BIT(TIOCM_DTR, UART011_CR_DTR);
BIT(TIOCM_OUT1, UART011_CR_OUT1);
BIT(TIOCM_OUT2, UART011_CR_OUT2);
BIT(TIOCM_LOOP, UART011_CR_LBE);
#undef BIT
writew(cr, uap->port.membase + UART011_CR);
}
static void pl011_break_ctl(struct uart_port *port, int break_state)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned long flags;
unsigned int lcr_h;
spin_lock_irqsave(&uap->port.lock, flags);
lcr_h = readw(uap->port.membase + UART011_LCRH);
if (break_state == -1)
lcr_h |= UART01x_LCRH_BRK;
else
lcr_h &= ~UART01x_LCRH_BRK;
writew(lcr_h, uap->port.membase + UART011_LCRH);
spin_unlock_irqrestore(&uap->port.lock, flags);
}
static int pl011_startup(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int cr;
int retval;
/*
* Try to enable the clock producer.
*/
retval = clk_enable(uap->clk);
if (retval)
goto out;
/*
* Allocate the IRQ
*/
retval = request_irq(uap->port.irq, pl011_int, 0, "uart-pl011", uap);
if (retval)
goto clk_dis;
writew(UART011_IFLS_RX4_8|UART011_IFLS_TX4_8,
uap->port.membase + UART011_IFLS);
/*
* Provoke TX FIFO interrupt into asserting.
*/
cr = UART01x_CR_UARTEN | UART011_CR_TXE | UART011_CR_LBE;
writew(cr, uap->port.membase + UART011_CR);
writew(0, uap->port.membase + UART011_FBRD);
writew(1, uap->port.membase + UART011_IBRD);
writew(0, uap->port.membase + UART011_LCRH);
writew(0, uap->port.membase + UART01x_DR);
while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_BUSY)
barrier();
cr = UART01x_CR_UARTEN | UART011_CR_RXE | UART011_CR_TXE;
writew(cr, uap->port.membase + UART011_CR);
/*
* initialise the old status of the modem signals
*/
uap->old_status = readw(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
/*
* Finally, enable interrupts
*/
spin_lock_irq(&uap->port.lock);
uap->im = UART011_RXIM | UART011_RTIM;
writew(uap->im, uap->port.membase + UART011_IMSC);
spin_unlock_irq(&uap->port.lock);
return 0;
clk_dis:
clk_disable(uap->clk);
out:
return retval;
}
static void pl011_shutdown(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned long val;
/*
* disable all interrupts
*/
spin_lock_irq(&uap->port.lock);
uap->im = 0;
writew(uap->im, uap->port.membase + UART011_IMSC);
writew(0xffff, uap->port.membase + UART011_ICR);
spin_unlock_irq(&uap->port.lock);
/*
* Free the interrupt
*/
free_irq(uap->port.irq, uap);
/*
* disable the port
*/
writew(UART01x_CR_UARTEN | UART011_CR_TXE, uap->port.membase + UART011_CR);
/*
* disable break condition and fifos
*/
val = readw(uap->port.membase + UART011_LCRH);
val &= ~(UART01x_LCRH_BRK | UART01x_LCRH_FEN);
writew(val, uap->port.membase + UART011_LCRH);
/*
* Shut down the clock producer
*/
clk_disable(uap->clk);
}
static void
pl011_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
unsigned int lcr_h, old_cr;
unsigned long flags;
unsigned int baud, quot;
/*
* Ask the core to calculate the divisor for us.
*/
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = port->uartclk * 4 / baud;
switch (termios->c_cflag & CSIZE) {
case CS5:
lcr_h = UART01x_LCRH_WLEN_5;
break;
case CS6:
lcr_h = UART01x_LCRH_WLEN_6;
break;
case CS7:
lcr_h = UART01x_LCRH_WLEN_7;
break;
default: // CS8
lcr_h = UART01x_LCRH_WLEN_8;
break;
}
if (termios->c_cflag & CSTOPB)
lcr_h |= UART01x_LCRH_STP2;
if (termios->c_cflag & PARENB) {
lcr_h |= UART01x_LCRH_PEN;
if (!(termios->c_cflag & PARODD))
lcr_h |= UART01x_LCRH_EPS;
}
if (port->fifosize > 1)
lcr_h |= UART01x_LCRH_FEN;
spin_lock_irqsave(&port->lock, flags);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
port->read_status_mask = UART01x_RSR_OE;
if (termios->c_iflag & INPCK)
port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
if (termios->c_iflag & (BRKINT | PARMRK))
port->read_status_mask |= UART01x_RSR_BE;
/*
* Characters to ignore
*/
port->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
if (termios->c_iflag & IGNBRK) {
port->ignore_status_mask |= UART01x_RSR_BE;
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= UART01x_RSR_OE;
}
/*
* Ignore all characters if CREAD is not set.
*/
if ((termios->c_cflag & CREAD) == 0)
port->ignore_status_mask |= UART_DUMMY_RSR_RX;
if (UART_ENABLE_MS(port, termios->c_cflag))
pl011_enable_ms(port);
/* first, disable everything */
old_cr = readw(port->membase + UART011_CR);
writew(0, port->membase + UART011_CR);
/* Set baud rate */
writew(quot & 0x3f, port->membase + UART011_FBRD);
writew(quot >> 6, port->membase + UART011_IBRD);
/*
* ----------v----------v----------v----------v-----
* NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
* ----------^----------^----------^----------^-----
*/
writew(lcr_h, port->membase + UART011_LCRH);
writew(old_cr, port->membase + UART011_CR);
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *pl011_type(struct uart_port *port)
{
return port->type == PORT_AMBA ? "AMBA/PL011" : NULL;
}
/*
* Release the memory region(s) being used by 'port'
*/
static void pl010_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, SZ_4K);
}
/*
* Request the memory region(s) being used by 'port'
*/
static int pl010_request_port(struct uart_port *port)
{
return request_mem_region(port->mapbase, SZ_4K, "uart-pl011")
!= NULL ? 0 : -EBUSY;
}
/*
* Configure/autoconfigure the port.
*/
static void pl010_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE) {
port->type = PORT_AMBA;
pl010_request_port(port);
}
}
/*
* verify the new serial_struct (for TIOCSSERIAL).
*/
static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
ret = -EINVAL;
if (ser->irq < 0 || ser->irq >= NR_IRQS)
ret = -EINVAL;
if (ser->baud_base < 9600)
ret = -EINVAL;
return ret;
}
static struct uart_ops amba_pl011_pops = {
.tx_empty = pl01x_tx_empty,
.set_mctrl = pl011_set_mctrl,
.get_mctrl = pl01x_get_mctrl,
.stop_tx = pl011_stop_tx,
.start_tx = pl011_start_tx,
.stop_rx = pl011_stop_rx,
.enable_ms = pl011_enable_ms,
.break_ctl = pl011_break_ctl,
.startup = pl011_startup,
.shutdown = pl011_shutdown,
.set_termios = pl011_set_termios,
.type = pl011_type,
.release_port = pl010_release_port,
.request_port = pl010_request_port,
.config_port = pl010_config_port,
.verify_port = pl010_verify_port,
};
static struct uart_amba_port *amba_ports[UART_NR];
#ifdef CONFIG_SERIAL_AMBA_PL011_CONSOLE
static inline void
pl011_console_write_char(struct uart_port *port, char ch)
{
unsigned int status;
do {
status = readw(port->membase + UART01x_FR);
} while (status & UART01x_FR_TXFF);
writew(ch, port->membase + UART01x_DR);
}
static void
pl011_console_write(struct console *co, const char *s, unsigned int count)
{
struct uart_port *port = &amba_ports[co->index]->port;
unsigned int status, old_cr, new_cr;
int i;
/*
* First save the CR then disable the interrupts
*/
old_cr = readw(port->membase + UART011_CR);
new_cr = old_cr & ~UART011_CR_CTSEN;
new_cr |= UART01x_CR_UARTEN | UART011_CR_TXE;
writew(new_cr, port->membase + UART011_CR);
/*
* Now, do each character
*/
for (i = 0; i < count; i++) {
pl011_console_write_char(port, s[i]);
if (s[i] == '\n')
pl011_console_write_char(port, '\r');
}
/*
* Finally, wait for transmitter to become empty
* and restore the TCR
*/
do {
status = readw(port->membase + UART01x_FR);
} while (status & UART01x_FR_BUSY);
writew(old_cr, port->membase + UART011_CR);
}
static void __init
pl011_console_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
if (readw(port->membase + UART011_CR) & UART01x_CR_UARTEN) {
unsigned int lcr_h, ibrd, fbrd;
lcr_h = readw(port->membase + UART011_LCRH);
*parity = 'n';
if (lcr_h & UART01x_LCRH_PEN) {
if (lcr_h & UART01x_LCRH_EPS)
*parity = 'e';
else
*parity = 'o';
}
if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
*bits = 7;
else
*bits = 8;
ibrd = readw(port->membase + UART011_IBRD);
fbrd = readw(port->membase + UART011_FBRD);
*baud = port->uartclk * 4 / (64 * ibrd + fbrd);
}
}
static int __init pl011_console_setup(struct console *co, char *options)
{
struct uart_amba_port *uap;
int baud = 38400;
int bits = 8;
int parity = 'n';
int flow = 'n';
int ret;
/*
* Check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index >= UART_NR)
co->index = 0;
uap = amba_ports[co->index];
ret = clk_enable(uap->clk);
if (ret)
return ret;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
pl011_console_get_options(&uap->port, &baud, &parity, &bits);
return uart_set_options(&uap->port, co, baud, parity, bits, flow);
}
extern struct uart_driver amba_reg;
static struct console amba_console = {
.name = "ttyAMA",
.write = pl011_console_write,
.device = uart_console_device,
.setup = pl011_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &amba_reg,
};
#define AMBA_CONSOLE (&amba_console)
#else
#define AMBA_CONSOLE NULL
#endif
static struct uart_driver amba_reg = {
.owner = THIS_MODULE,
.driver_name = "ttyAMA",
.dev_name = "ttyAMA",
.major = SERIAL_AMBA_MAJOR,
.minor = SERIAL_AMBA_MINOR,
.nr = UART_NR,
.cons = AMBA_CONSOLE,
};
static int pl011_probe(struct amba_device *dev, void *id)
{
struct uart_amba_port *uap;
void *base;
int i, ret;
for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
if (amba_ports[i] == NULL)
break;
if (i == ARRAY_SIZE(amba_ports)) {
ret = -EBUSY;
goto out;
}
uap = kmalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
if (uap == NULL) {
ret = -ENOMEM;
goto out;
}
base = ioremap(dev->res.start, PAGE_SIZE);
if (!base) {
ret = -ENOMEM;
goto free;
}
memset(uap, 0, sizeof(struct uart_amba_port));
uap->clk = clk_get(&dev->dev, "UARTCLK");
if (IS_ERR(uap->clk)) {
ret = PTR_ERR(uap->clk);
goto unmap;
}
uap->port.dev = &dev->dev;
uap->port.mapbase = dev->res.start;
uap->port.membase = base;
uap->port.iotype = UPIO_MEM;
uap->port.irq = dev->irq[0];
uap->port.uartclk = clk_get_rate(uap->clk);
uap->port.fifosize = 16;
uap->port.ops = &amba_pl011_pops;
uap->port.flags = UPF_BOOT_AUTOCONF;
uap->port.line = i;
amba_ports[i] = uap;
amba_set_drvdata(dev, uap);
ret = uart_add_one_port(&amba_reg, &uap->port);
if (ret) {
amba_set_drvdata(dev, NULL);
amba_ports[i] = NULL;
clk_put(uap->clk);
unmap:
iounmap(base);
free:
kfree(uap);
}
out:
return ret;
}
static int pl011_remove(struct amba_device *dev)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
int i;
amba_set_drvdata(dev, NULL);
uart_remove_one_port(&amba_reg, &uap->port);
for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
if (amba_ports[i] == uap)
amba_ports[i] = NULL;
iounmap(uap->port.membase);
clk_put(uap->clk);
kfree(uap);
return 0;
}
static struct amba_id pl011_ids[] __initdata = {
{
.id = 0x00041011,
.mask = 0x000fffff,
},
{ 0, 0 },
};
static struct amba_driver pl011_driver = {
.drv = {
.name = "uart-pl011",
},
.id_table = pl011_ids,
.probe = pl011_probe,
.remove = pl011_remove,
};
static int __init pl011_init(void)
{
int ret;
printk(KERN_INFO "Serial: AMBA PL011 UART driver\n");
ret = uart_register_driver(&amba_reg);
if (ret == 0) {
ret = amba_driver_register(&pl011_driver);
if (ret)
uart_unregister_driver(&amba_reg);
}
return ret;
}
static void __exit pl011_exit(void)
{
amba_driver_unregister(&pl011_driver);
uart_unregister_driver(&amba_reg);
}
module_init(pl011_init);
module_exit(pl011_exit);
MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("ARM AMBA serial port driver");
MODULE_LICENSE("GPL");
include/asm-arm/hardware/amba_serial.h 0 → 100644
View file @ 157c0342
/*
* linux/include/asm-arm/hardware/serial_amba.h
*
* Internal header file for AMBA serial ports
*
* Copyright (C) ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef ASM_ARM_HARDWARE_SERIAL_AMBA_H
#define ASM_ARM_HARDWARE_SERIAL_AMBA_H
/* -------------------------------------------------------------------------------
* From AMBA UART (PL010) Block Specification
* -------------------------------------------------------------------------------
* UART Register Offsets.
*/
#define UART01x_DR 0x00 /* Data read or written from the interface. */
#define UART01x_RSR 0x04 /* Receive status register (Read). */
#define UART01x_ECR 0x04 /* Error clear register (Write). */
#define UART010_LCRH 0x08 /* Line control register, high byte. */
#define UART010_LCRM 0x0C /* Line control register, middle byte. */
#define UART010_LCRL 0x10 /* Line control register, low byte. */
#define UART010_CR 0x14 /* Control register. */
#define UART01x_FR 0x18 /* Flag register (Read only). */
#define UART010_IIR 0x1C /* Interrupt indentification register (Read). */
#define UART010_ICR 0x1C /* Interrupt clear register (Write). */
#define UART01x_ILPR 0x20 /* IrDA low power counter register. */
#define UART011_IBRD 0x24 /* Integer baud rate divisor register. */
#define UART011_FBRD 0x28 /* Fractional baud rate divisor register. */
#define UART011_LCRH 0x2c /* Line control register. */
#define UART011_CR 0x30 /* Control register. */
#define UART011_IFLS 0x34 /* Interrupt fifo level select. */
#define UART011_IMSC 0x38 /* Interrupt mask. */
#define UART011_RIS 0x3c /* Raw interrupt status. */
#define UART011_MIS 0x40 /* Masked interrupt status. */
#define UART011_ICR 0x44 /* Interrupt clear register. */
#define UART011_DMACR 0x48 /* DMA control register. */
#define UART01x_RSR_OE 0x08
#define UART01x_RSR_BE 0x04
#define UART01x_RSR_PE 0x02
#define UART01x_RSR_FE 0x01
#define UART011_FR_RI 0x100
#define UART011_FR_TXFE 0x080
#define UART011_FR_RXFF 0x040
#define UART01x_FR_TXFF 0x020
#define UART01x_FR_RXFE 0x010
#define UART01x_FR_BUSY 0x008
#define UART01x_FR_DCD 0x004
#define UART01x_FR_DSR 0x002
#define UART01x_FR_CTS 0x001
#define UART01x_FR_TMSK (UART01x_FR_TXFF + UART01x_FR_BUSY)
#define UART011_CR_CTSEN 0x8000 /* CTS hardware flow control */
#define UART011_CR_RTSEN 0x4000 /* RTS hardware flow control */
#define UART011_CR_OUT2 0x2000 /* OUT2 */
#define UART011_CR_OUT1 0x1000 /* OUT1 */
#define UART011_CR_RTS 0x0800 /* RTS */
#define UART011_CR_DTR 0x0400 /* DTR */
#define UART011_CR_RXE 0x0200 /* receive enable */
#define UART011_CR_TXE 0x0100 /* transmit enable */
#define UART011_CR_LBE 0x0080 /* loopback enable */
#define UART010_CR_RTIE 0x0040
#define UART010_CR_TIE 0x0020
#define UART010_CR_RIE 0x0010
#define UART010_CR_MSIE 0x0008
#define UART01x_CR_IIRLP 0x0004 /* SIR low power mode */
#define UART01x_CR_SIREN 0x0002 /* SIR enable */
#define UART01x_CR_UARTEN 0x0001 /* UART enable */
#define UART011_LCRH_SPS 0x80
#define UART01x_LCRH_WLEN_8 0x60
#define UART01x_LCRH_WLEN_7 0x40
#define UART01x_LCRH_WLEN_6 0x20
#define UART01x_LCRH_WLEN_5 0x00
#define UART01x_LCRH_FEN 0x10
#define UART01x_LCRH_STP2 0x08
#define UART01x_LCRH_EPS 0x04
#define UART01x_LCRH_PEN 0x02
#define UART01x_LCRH_BRK 0x01
#define UART010_IIR_RTIS 0x08
#define UART010_IIR_TIS 0x04
#define UART010_IIR_RIS 0x02
#define UART010_IIR_MIS 0x01
#define UART011_IFLS_RX1_8 (0 << 3)
#define UART011_IFLS_RX2_8 (1 << 3)
#define UART011_IFLS_RX4_8 (2 << 3)
#define UART011_IFLS_RX6_8 (3 << 3)
#define UART011_IFLS_RX7_8 (4 << 3)
#define UART011_IFLS_TX1_8 (0 << 0)
#define UART011_IFLS_TX2_8 (1 << 0)
#define UART011_IFLS_TX4_8 (2 << 0)
#define UART011_IFLS_TX6_8 (3 << 0)
#define UART011_IFLS_TX7_8 (4 << 0)
#define UART011_OEIM (1 << 10) /* overrun error interrupt mask */
#define UART011_BEIM (1 << 9) /* break error interrupt mask */
#define UART011_PEIM (1 << 8) /* parity error interrupt mask */
#define UART011_FEIM (1 << 7) /* framing error interrupt mask */
#define UART011_RTIM (1 << 6) /* receive timeout interrupt mask */
#define UART011_TXIM (1 << 5) /* transmit interrupt mask */
#define UART011_RXIM (1 << 4) /* receive interrupt mask */
#define UART011_DSRMIM (1 << 3) /* DSR interrupt mask */
#define UART011_DCDMIM (1 << 2) /* DCD interrupt mask */
#define UART011_CTSMIM (1 << 1) /* CTS interrupt mask */
#define UART011_RIMIM (1 << 0) /* RI interrupt mask */
#define UART011_OEIS (1 << 10) /* overrun error interrupt status */
#define UART011_BEIS (1 << 9) /* break error interrupt status */
#define UART011_PEIS (1 << 8) /* parity error interrupt status */
#define UART011_FEIS (1 << 7) /* framing error interrupt status */
#define UART011_RTIS (1 << 6) /* receive timeout interrupt status */
#define UART011_TXIS (1 << 5) /* transmit interrupt status */
#define UART011_RXIS (1 << 4) /* receive interrupt status */
#define UART011_DSRMIS (1 << 3) /* DSR interrupt status */
#define UART011_DCDMIS (1 << 2) /* DCD interrupt status */
#define UART011_CTSMIS (1 << 1) /* CTS interrupt status */
#define UART011_RIMIS (1 << 0) /* RI interrupt status */
#define UART011_OEIC (1 << 10) /* overrun error interrupt clear */
#define UART011_BEIC (1 << 9) /* break error interrupt clear */
#define UART011_PEIC (1 << 8) /* parity error interrupt clear */
#define UART011_FEIC (1 << 7) /* framing error interrupt clear */
#define UART011_RTIC (1 << 6) /* receive timeout interrupt clear */
#define UART011_TXIC (1 << 5) /* transmit interrupt clear */
#define UART011_RXIC (1 << 4) /* receive interrupt clear */
#define UART011_DSRMIC (1 << 3) /* DSR interrupt clear */
#define UART011_DCDMIC (1 << 2) /* DCD interrupt clear */
#define UART011_CTSMIC (1 << 1) /* CTS interrupt clear */
#define UART011_RIMIC (1 << 0) /* RI interrupt clear */
#define UART011_DMAONERR (1 << 2) /* disable dma on error */
#define UART011_TXDMAE (1 << 1) /* enable transmit dma */
#define UART011_RXDMAE (1 << 0) /* enable receive dma */
#define UART01x_RSR_ANY (UART01x_RSR_OE|UART01x_RSR_BE|UART01x_RSR_PE|UART01x_RSR_FE)
#define UART01x_FR_MODEM_ANY (UART01x_FR_DCD|UART01x_FR_DSR|UART01x_FR_CTS)
#endif
include/asm-arm/hardware/serial_amba.h deleted 100644 → 0
View file @ 51af77db
/*
* linux/include/asm-arm/hardware/serial_amba.h
*
* Internal header file for AMBA serial ports
*
* Copyright (C) ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef ASM_ARM_HARDWARE_SERIAL_AMBA_H
#define ASM_ARM_HARDWARE_SERIAL_AMBA_H
/* -------------------------------------------------------------------------------
* From AMBA UART (PL010) Block Specification (ARM-0001-CUST-DSPC-A03)
* -------------------------------------------------------------------------------
* UART Register Offsets.
*/
#define AMBA_UARTDR 0x00 /* Data read or written from the interface. */
#define AMBA_UARTRSR 0x04 /* Receive status register (Read). */
#define AMBA_UARTECR 0x04 /* Error clear register (Write). */
#define AMBA_UARTLCR_H 0x08 /* Line control register, high byte. */
#define AMBA_UARTLCR_M 0x0C /* Line control register, middle byte. */
#define AMBA_UARTLCR_L 0x10 /* Line control register, low byte. */
#define AMBA_UARTCR 0x14 /* Control register. */
#define AMBA_UARTFR 0x18 /* Flag register (Read only). */
#define AMBA_UARTIIR 0x1C /* Interrupt indentification register (Read). */
#define AMBA_UARTICR 0x1C /* Interrupt clear register (Write). */
#define AMBA_UARTILPR 0x20 /* IrDA low power counter register. */
#define AMBA_UARTRSR_OE 0x08
#define AMBA_UARTRSR_BE 0x04
#define AMBA_UARTRSR_PE 0x02
#define AMBA_UARTRSR_FE 0x01
#define AMBA_UARTFR_TXFF 0x20
#define AMBA_UARTFR_RXFE 0x10
#define AMBA_UARTFR_BUSY 0x08
#define AMBA_UARTFR_DCD 0x04
#define AMBA_UARTFR_DSR 0x02
#define AMBA_UARTFR_CTS 0x01
#define AMBA_UARTFR_TMSK (AMBA_UARTFR_TXFF + AMBA_UARTFR_BUSY)
#define AMBA_UARTCR_RTIE 0x40
#define AMBA_UARTCR_TIE 0x20
#define AMBA_UARTCR_RIE 0x10
#define AMBA_UARTCR_MSIE 0x08
#define AMBA_UARTCR_IIRLP 0x04
#define AMBA_UARTCR_SIREN 0x02
#define AMBA_UARTCR_UARTEN 0x01
#define AMBA_UARTLCR_H_WLEN_8 0x60
#define AMBA_UARTLCR_H_WLEN_7 0x40
#define AMBA_UARTLCR_H_WLEN_6 0x20
#define AMBA_UARTLCR_H_WLEN_5 0x00
#define AMBA_UARTLCR_H_FEN 0x10
#define AMBA_UARTLCR_H_STP2 0x08
#define AMBA_UARTLCR_H_EPS 0x04
#define AMBA_UARTLCR_H_PEN 0x02
#define AMBA_UARTLCR_H_BRK 0x01
#define AMBA_UARTIIR_RTIS 0x08
#define AMBA_UARTIIR_TIS 0x04
#define AMBA_UARTIIR_RIS 0x02
#define AMBA_UARTIIR_MIS 0x01
#define ARM_BAUD_460800 1
#define ARM_BAUD_230400 3
#define ARM_BAUD_115200 7
#define ARM_BAUD_57600 15
#define ARM_BAUD_38400 23
#define ARM_BAUD_19200 47
#define ARM_BAUD_14400 63
#define ARM_BAUD_9600 95
#define ARM_BAUD_4800 191
#define ARM_BAUD_2400 383
#define ARM_BAUD_1200 767
#define AMBA_UARTRSR_ANY (AMBA_UARTRSR_OE|AMBA_UARTRSR_BE|AMBA_UARTRSR_PE|AMBA_UARTRSR_FE)
#define AMBA_UARTFR_MODEM_ANY (AMBA_UARTFR_DCD|AMBA_UARTFR_DSR|AMBA_UARTFR_CTS)
#endif
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7