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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCHv2] xen: extract register definitions from ns16550 into a separated header
Since both UART driver codes on Allwinner A31, OMAP5 and x86 would use
these definitions, we refactor the codes into a separated header to avoid
unnecessary duplication.
Signed-off-by: Chen Baozi <baozich@xxxxxxxxx>
---
Changes in v2:
- Add UART_ prefixes to the definitions as Ian suggested on July 3rd.
---
xen/drivers/char/ns16550.c | 155 ++++++++++++-----------------------------
xen/include/xen/ns16550-uart.h | 104 +++++++++++++++++++++++++++
2 files changed, 148 insertions(+), 111 deletions(-)
create mode 100644 xen/include/xen/ns16550-uart.h
diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index e0c87bb..e085a64 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -19,6 +19,7 @@
#include <xen/iocap.h>
#include <xen/pci.h>
#include <xen/pci_regs.h>
+#include <xen/ns16550-uart.h>
#include <asm/io.h>
#ifdef CONFIG_X86
#include <asm/fixmap.h>
@@ -58,76 +59,6 @@ static struct ns16550 {
u8 bar_idx;
} ns16550_com[2] = { { 0 } };
-/* Register offsets */
-#define RBR 0x00 /* receive buffer */
-#define THR 0x00 /* transmit holding */
-#define IER 0x01 /* interrupt enable */
-#define IIR 0x02 /* interrupt identity */
-#define FCR 0x02 /* FIFO control */
-#define LCR 0x03 /* line control */
-#define MCR 0x04 /* Modem control */
-#define LSR 0x05 /* line status */
-#define MSR 0x06 /* Modem status */
-#define DLL 0x00 /* divisor latch (ls) (DLAB=1) */
-#define DLM 0x01 /* divisor latch (ms) (DLAB=1) */
-
-/* Interrupt Enable Register */
-#define IER_ERDAI 0x01 /* rx data recv'd */
-#define IER_ETHREI 0x02 /* tx reg. empty */
-#define IER_ELSI 0x04 /* rx line status */
-#define IER_EMSI 0x08 /* MODEM status */
-
-/* Interrupt Identification Register */
-#define IIR_NOINT 0x01 /* no interrupt pending */
-#define IIR_IMASK 0x06 /* interrupt identity: */
-#define IIR_LSI 0x06 /* - rx line status */
-#define IIR_RDAI 0x04 /* - rx data recv'd */
-#define IIR_THREI 0x02 /* - tx reg. empty */
-#define IIR_MSI 0x00 /* - MODEM status */
-
-/* FIFO Control Register */
-#define FCR_ENABLE 0x01 /* enable FIFO */
-#define FCR_CLRX 0x02 /* clear Rx FIFO */
-#define FCR_CLTX 0x04 /* clear Tx FIFO */
-#define FCR_DMA 0x10 /* enter DMA mode */
-#define FCR_TRG1 0x00 /* Rx FIFO trig lev 1 */
-#define FCR_TRG4 0x40 /* Rx FIFO trig lev 4 */
-#define FCR_TRG8 0x80 /* Rx FIFO trig lev 8 */
-#define FCR_TRG14 0xc0 /* Rx FIFO trig lev 14 */
-
-/* Line Control Register */
-#define LCR_DLAB 0x80 /* Divisor Latch Access */
-
-/* Modem Control Register */
-#define MCR_DTR 0x01 /* Data Terminal Ready */
-#define MCR_RTS 0x02 /* Request to Send */
-#define MCR_OUT2 0x08 /* OUT2: interrupt mask */
-#define MCR_LOOP 0x10 /* Enable loopback test mode */
-
-/* Line Status Register */
-#define LSR_DR 0x01 /* Data ready */
-#define LSR_OE 0x02 /* Overrun */
-#define LSR_PE 0x04 /* Parity error */
-#define LSR_FE 0x08 /* Framing error */
-#define LSR_BI 0x10 /* Break */
-#define LSR_THRE 0x20 /* Xmit hold reg empty */
-#define LSR_TEMT 0x40 /* Xmitter empty */
-#define LSR_ERR 0x80 /* Error */
-
-/* These parity settings can be ORed directly into the LCR. */
-#define PARITY_NONE (0<<3)
-#define PARITY_ODD (1<<3)
-#define PARITY_EVEN (3<<3)
-#define PARITY_MARK (5<<3)
-#define PARITY_SPACE (7<<3)
-
-/* Frequency of external clock source. This definition assumes PC platform. */
-#define UART_CLOCK_HZ 1843200
-
-/* Resume retry settings */
-#define RESUME_DELAY MILLISECS(10)
-#define RESUME_RETRIES 100
-
static char ns_read_reg(struct ns16550 *uart, int reg)
{
if ( uart->remapped_io_base == NULL )
@@ -150,12 +81,12 @@ static void ns16550_interrupt(
uart->intr_works = 1;
- while ( !(ns_read_reg(uart, IIR) & IIR_NOINT) )
+ while ( !(ns_read_reg(uart, UART_IIR) & UART_IIR_NOINT) )
{
- char lsr = ns_read_reg(uart, LSR);
- if ( lsr & LSR_THRE )
+ char lsr = ns_read_reg(uart, UART_LSR);
+ if ( lsr & UART_LSR_THRE )
serial_tx_interrupt(port, regs);
- if ( lsr & LSR_DR )
+ if ( lsr & UART_LSR_DR )
serial_rx_interrupt(port, regs);
}
}
@@ -171,10 +102,10 @@ static void __ns16550_poll(struct cpu_user_regs *regs)
if ( uart->intr_works )
return; /* Interrupts work - no more polling */
- while ( ns_read_reg(uart, LSR) & LSR_DR )
+ while ( ns_read_reg(uart, UART_LSR) & UART_LSR_DR )
serial_rx_interrupt(port, regs);
- if ( ns_read_reg(uart, LSR) & LSR_THRE )
+ if ( ns_read_reg(uart, UART_LSR) & UART_LSR_THRE )
serial_tx_interrupt(port, regs);
set_timer(&uart->timer, NOW() + MILLISECS(uart->timeout_ms));
@@ -194,23 +125,23 @@ static unsigned int ns16550_tx_ready(struct serial_port
*port)
{
struct ns16550 *uart = port->uart;
- return ns_read_reg(uart, LSR) & LSR_THRE ? uart->fifo_size : 0;
+ return ns_read_reg(uart, UART_LSR) & UART_LSR_THRE ? uart->fifo_size : 0;
}
static void ns16550_putc(struct serial_port *port, char c)
{
struct ns16550 *uart = port->uart;
- ns_write_reg(uart, THR, c);
+ ns_write_reg(uart, UART_THR, c);
}
static int ns16550_getc(struct serial_port *port, char *pc)
{
struct ns16550 *uart = port->uart;
- if ( !(ns_read_reg(uart, LSR) & LSR_DR) )
+ if ( !(ns_read_reg(uart, UART_LSR) & UART_LSR_DR) )
return 0;
- *pc = ns_read_reg(uart, RBR);
+ *pc = ns_read_reg(uart, UART_RBR);
return 1;
}
@@ -244,31 +175,32 @@ static void ns16550_setup_preirq(struct ns16550 *uart)
lcr = (uart->data_bits - 5) | ((uart->stop_bits - 1) << 2) | uart->parity;
/* No interrupts. */
- ns_write_reg(uart, IER, 0);
+ ns_write_reg(uart, UART_IER, 0);
/* Line control and baud-rate generator. */
- ns_write_reg(uart, LCR, lcr | LCR_DLAB);
+ ns_write_reg(uart, UART_LCR, lcr | UART_LCR_DLAB);
if ( uart->baud != BAUD_AUTO )
{
/* Baud rate specified: program it into the divisor latch. */
divisor = uart->clock_hz / (uart->baud << 4);
- ns_write_reg(uart, DLL, (char)divisor);
- ns_write_reg(uart, DLM, (char)(divisor >> 8));
+ ns_write_reg(uart, UART_DLL, (char)divisor);
+ ns_write_reg(uart, UART_DLM, (char)(divisor >> 8));
}
else
{
/* Baud rate already set: read it out from the divisor latch. */
- divisor = ns_read_reg(uart, DLL);
- divisor |= ns_read_reg(uart, DLM) << 8;
+ divisor = ns_read_reg(uart, UART_DLL);
+ divisor |= ns_read_reg(uart, UART_DLM) << 8;
uart->baud = uart->clock_hz / (divisor << 4);
}
- ns_write_reg(uart, LCR, lcr);
+ ns_write_reg(uart, UART_LCR, lcr);
/* No flow ctrl: DTR and RTS are both wedged high to keep remote happy. */
- ns_write_reg(uart, MCR, MCR_DTR | MCR_RTS);
+ ns_write_reg(uart, UART_MCR, UART_MCR_DTR | UART_MCR_RTS);
/* Enable and clear the FIFOs. Set a large trigger threshold. */
- ns_write_reg(uart, FCR, FCR_ENABLE | FCR_CLRX | FCR_CLTX | FCR_TRG14);
+ ns_write_reg(uart, UART_FCR,
+ UART_FCR_ENABLE | UART_FCR_CLRX | UART_FCR_CLTX |
UART_FCR_TRG14);
}
static void __init ns16550_init_preirq(struct serial_port *port)
@@ -292,8 +224,8 @@ static void __init ns16550_init_preirq(struct serial_port
*port)
ns16550_setup_preirq(uart);
/* Check this really is a 16550+. Otherwise we have no FIFOs. */
- if ( ((ns_read_reg(uart, IIR) & 0xc0) == 0xc0) &&
- ((ns_read_reg(uart, FCR) & FCR_TRG14) == FCR_TRG14) )
+ if ( ((ns_read_reg(uart, UART_IIR) & 0xc0) == 0xc0) &&
+ ((ns_read_reg(uart, UART_FCR) & UART_FCR_TRG14) == UART_FCR_TRG14) )
uart->fifo_size = 16;
}
@@ -302,10 +234,11 @@ static void ns16550_setup_postirq(struct ns16550 *uart)
if ( uart->irq > 0 )
{
/* Master interrupt enable; also keep DTR/RTS asserted. */
- ns_write_reg(uart, MCR, MCR_OUT2 | MCR_DTR | MCR_RTS);
+ ns_write_reg(uart,
+ UART_MCR, UART_MCR_OUT2 | UART_MCR_DTR | UART_MCR_RTS);
/* Enable receive and transmit interrupts. */
- ns_write_reg(uart, IER, IER_ERDAI | IER_ETHREI);
+ ns_write_reg(uart, UART_IER, UART_IER_ERDAI | UART_IER_ETHREI);
}
if ( uart->irq >= 0 )
@@ -374,11 +307,11 @@ static void _ns16550_resume(struct serial_port *port)
static int ns16550_ioport_invalid(struct ns16550 *uart)
{
- return ((((unsigned char)ns_read_reg(uart, LSR)) == 0xff) &&
- (((unsigned char)ns_read_reg(uart, MCR)) == 0xff) &&
- (((unsigned char)ns_read_reg(uart, IER)) == 0xff) &&
- (((unsigned char)ns_read_reg(uart, IIR)) == 0xff) &&
- (((unsigned char)ns_read_reg(uart, LCR)) == 0xff));
+ return ((((unsigned char)ns_read_reg(uart, UART_LSR)) == 0xff) &&
+ (((unsigned char)ns_read_reg(uart, UART_MCR)) == 0xff) &&
+ (((unsigned char)ns_read_reg(uart, UART_IER)) == 0xff) &&
+ (((unsigned char)ns_read_reg(uart, UART_IIR)) == 0xff) &&
+ (((unsigned char)ns_read_reg(uart, UART_LCR)) == 0xff));
}
static int delayed_resume_tries;
@@ -457,15 +390,15 @@ static int __init parse_parity_char(int c)
switch ( c )
{
case 'n':
- return PARITY_NONE;
+ return UART_PARITY_NONE;
case 'o':
- return PARITY_ODD;
+ return UART_PARITY_ODD;
case 'e':
- return PARITY_EVEN;
+ return UART_PARITY_EVEN;
case 'm':
- return PARITY_MARK;
+ return UART_PARITY_MARK;
case 's':
- return PARITY_SPACE;
+ return UART_PARITY_SPACE;
}
return 0;
}
@@ -500,17 +433,17 @@ static int __init check_existence(struct ns16550 *uart)
* Do a simple existence test first; if we fail this,
* there's no point trying anything else.
*/
- scratch = ns_read_reg(uart, IER);
- ns_write_reg(uart, IER, 0);
+ scratch = ns_read_reg(uart, UART_IER);
+ ns_write_reg(uart, UART_IER, 0);
/*
* Mask out IER[7:4] bits for test as some UARTs (e.g. TL
* 16C754B) allow only to modify them if an EFR bit is set.
*/
- scratch2 = ns_read_reg(uart, IER) & 0x0f;
- ns_write_reg(uart, IER, 0x0F);
- scratch3 = ns_read_reg(uart, IER) & 0x0f;
- ns_write_reg(uart, IER, scratch);
+ scratch2 = ns_read_reg(uart, UART_IER) & 0x0f;
+ ns_write_reg(uart,UART_IER, 0x0F);
+ scratch3 = ns_read_reg(uart, UART_IER) & 0x0f;
+ ns_write_reg(uart, UART_IER, scratch);
if ( (scratch2 != 0) || (scratch3 != 0x0F) )
return 0;
@@ -518,8 +451,8 @@ static int __init check_existence(struct ns16550 *uart)
* Check to see if a UART is really there.
* Use loopback test mode.
*/
- ns_write_reg(uart, MCR, MCR_LOOP | 0x0A);
- status = ns_read_reg(uart, MSR) & 0xF0;
+ ns_write_reg(uart, UART_MCR, UART_MCR_LOOP | 0x0A);
+ status = ns_read_reg(uart, UART_MSR) & 0xF0;
return (status == 0x90);
}
diff --git a/xen/include/xen/ns16550-uart.h b/xen/include/xen/ns16550-uart.h
new file mode 100644
index 0000000..27119db
--- /dev/null
+++ b/xen/include/xen/ns16550-uart.h
@@ -0,0 +1,104 @@
+/*
+ * xen/include/xen/ns16550-uart.h
+ *
+ * This header is extracted from driver/char/ns16550.c
+ *
+ * Common constant definition between early printk and the UART driver
+ * for the 16550-series UART
+ *
+ * Copyright (c) 2003-2005, K A Fraser
+ *
+ * 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.
+ */
+
+#ifndef __XEN_NS16550_H__
+#define __XEN_NS16550_H__
+
+/* Register offsets */
+#define UART_RBR 0x00 /* receive buffer */
+#define UART_THR 0x00 /* transmit holding */
+#define UART_IER 0x01 /* interrupt enable */
+#define UART_IIR 0x02 /* interrupt identity */
+#define UART_FCR 0x02 /* FIFO control */
+#define UART_LCR 0x03 /* line control */
+#define UART_MCR 0x04 /* Modem control */
+#define UART_LSR 0x05 /* line status */
+#define UART_MSR 0x06 /* Modem status */
+#define UART_DLL 0x00 /* divisor latch (ls) (DLAB=1) */
+#define UART_DLM 0x01 /* divisor latch (ms) (DLAB=1) */
+
+/* Interrupt Enable Register */
+#define UART_IER_ERDAI 0x01 /* rx data recv'd */
+#define UART_IER_ETHREI 0x02 /* tx reg. empty */
+#define UART_IER_ELSI 0x04 /* rx line status */
+#define UART_IER_EMSI 0x08 /* MODEM status */
+
+/* Interrupt Identificatiegister */
+#define UART_IIR_NOINT 0x01 /* no interrupt pending */
+#define UART_UART_IIR_IMA 0x06 /* interrupt identity: */
+#define UART_UART_IIR_LSI 0x06 /* - rx line status */
+#define UART_UART_IIR_RDA 0x04 /* - rx data recv'd */
+#define UART_UART_IIR_THR 0x02 /* - tx reg. empty */
+#define UART_UART_IIR_MSI 0x00 /* - MODEM status */
+
+/* FIFO Control Register */
+#define UART_FCR_ENABLE 0x01 /* enable FIFO */
+#define UART_FCR_CLRX 0x02 /* clear Rx FIFO */
+#define UART_FCR_CLTX 0x04 /* clear Tx FIFO */
+#define UART_FCR_DMA 0x10 /* enter DMA mode */
+#define UART_FCR_TRG1 0x00 /* Rx FIFO trig lev 1 */
+#define UART_FCR_TRG4 0x40 /* Rx FIFO trig lev 4 */
+#define UART_FCR_TRG8 0x80 /* Rx FIFO trig lev 8 */
+#define UART_FCR_TRG14 0xc0 /* Rx FIFO trig lev 14 */
+
+/* Line Control Register */
+#define UART_LCR_DLAB 0x80 /* Divisor Latch Access */
+
+/* Modem Control Register */
+#define UART_MCR_DTR 0x01 /* Data Terminal Ready */
+#define UART_MCR_RTS 0x02 /* Request to Send */
+#define UART_MCR_OUT2 0x08 /* OUT2: interrupt mask */
+#define UART_MCR_LOOP 0x10 /* Enable loopback test mode */
+
+/* Line Status Register */
+#define UART_LSR_DR 0x01 /* Data ready */
+#define UART_LSR_OE 0x02 /* Overrun */
+#define UART_LSR_PE 0x04 /* Parity error */
+#define UART_LSR_FE 0x08 /* Framing error */
+#define UART_LSR_BI 0x10 /* Break */
+#define UART_LSR_THRE 0x20 /* Xmit hold reg empty */
+#define UART_LSR_TEMT 0x40 /* Xmitter empty */
+#define UART_LSR_ERR 0x80 /* Error */
+
+/* These parity settings can be ORed directly into the LCR. */
+#define UART_PARITY_NONE (0<<3)
+#define UART_PARITY_ODD (1<<3)
+#define UART_PARITY_EVEN (3<<3)
+#define UART_PARITY_MARK (5<<3)
+#define UART_PARITY_SPACE (7<<3)
+
+/* Frequency of external clock source. This definition assumes PC platform. */
+#define UART_CLOCK_HZ 1843200
+
+/* Resume retry settings */
+#define RESUME_DELAY MILLISECS(10)
+#define RESUME_RETRIES 100
+
+#endif /* __XEN_NS16550_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.8.1.4
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