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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Allow arch-specific defaults to be specified for ns16550
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 64f26eed8d473a96beab96162c230f1300539d7c
# Parent 9b77ba29108d9e0ad4fcae90d9df51888d8d1244
Allow arch-specific defaults to be specified for ns16550
uart configuration. Based on a patch from Hollis Blanchard
at IBM.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r 9b77ba29108d -r 64f26eed8d47 xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c Thu Jul 14 08:00:55 2005
+++ b/xen/arch/x86/setup.c Thu Jul 14 09:05:22 2005
@@ -247,6 +247,11 @@
unsigned long initial_images_start, initial_images_end;
struct e820entry e820_raw[E820MAX];
int i, e820_raw_nr = 0, bytes = 0;
+ struct ns16550_defaults ns16550 = {
+ .data_bits = 8,
+ .parity = 'n',
+ .stop_bits = 1
+ };
/* Parse the command-line options. */
if ( (mbi->flags & MBI_CMDLINE) && (mbi->cmdline != 0) )
@@ -259,7 +264,12 @@
smp_prepare_boot_cpu();
/* We initialise the serial devices very early so we can get debugging. */
- ns16550_init();
+ ns16550.io_base = 0x3f8;
+ ns16550.irq = 4;
+ ns16550_init(0, &ns16550);
+ ns16550.io_base = 0x2f8;
+ ns16550.irq = 3;
+ ns16550_init(1, &ns16550);
serial_init_preirq();
init_console();
diff -r 9b77ba29108d -r 64f26eed8d47 xen/include/xen/serial.h
--- a/xen/include/xen/serial.h Thu Jul 14 08:00:55 2005
+++ b/xen/include/xen/serial.h Thu Jul 14 09:05:22 2005
@@ -113,7 +113,15 @@
/*
* Initialisers for individual uart drivers.
*/
-void ns16550_init(void);
+struct ns16550_defaults {
+ int baud; /* default baud rate; 0 == pre-configured */
+ int data_bits; /* default data bits (5, 6, 7 or 8) */
+ int parity; /* default parity (n, o, e, m or s) */
+ int stop_bits; /* default stop bits (1 or 2) */
+ int irq; /* default irq */
+ unsigned long io_base; /* default io_base address */
+};
+void ns16550_init(int index, struct ns16550_defaults *defaults);
#endif /* __XEN_SERIAL_H__ */
diff -r 9b77ba29108d -r 64f26eed8d47 xen/drivers/char/ns16550.c
--- a/xen/drivers/char/ns16550.c Thu Jul 14 08:00:55 2005
+++ b/xen/drivers/char/ns16550.c Thu Jul 14 09:05:22 2005
@@ -16,7 +16,7 @@
#include <asm/io.h>
/* Config serial port with a string <baud>,DPS,<io-base>,<irq>. */
-char opt_com1[30] = "", opt_com2[30] = "";
+static char opt_com1[30] = "", opt_com2[30] = "";
string_param("com1", opt_com1);
string_param("com2", opt_com2);
@@ -25,10 +25,7 @@
unsigned long io_base; /* I/O port or memory-mapped I/O address. */
char *remapped_io_base; /* Remapped virtual address of mmap I/O. */
struct irqaction irqaction;
-} ns16550_com[2] = {
- { 0, 0, 0, 0, 4, 0x3f8 },
- { 0, 0, 0, 0, 3, 0x2f8 }
-};
+} ns16550_com[2] = { { 0 } };
/* Register offsets */
#define RBR 0x00 /* receive buffer */
@@ -157,9 +154,12 @@
ns_write_reg(uart, IER, 0);
/* Line control and baud-rate generator. */
- ns_write_reg(uart, LCR, lcr | LCR_DLAB);
- ns_write_reg(uart, DLL, 115200/uart->baud); /* baud lo */
- ns_write_reg(uart, DLM, 0); /* baud hi */
+ if ( uart->baud != 0 )
+ {
+ ns_write_reg(uart, LCR, lcr | LCR_DLAB);
+ ns_write_reg(uart, DLL, 115200/uart->baud); /* baud lo */
+ ns_write_reg(uart, DLM, 0); /* baud hi */
+ }
ns_write_reg(uart, LCR, lcr); /* parity, data, stop */
/* No flow ctrl: DTR and RTS are both wedged high to keep remote happy. */
@@ -177,6 +177,9 @@
{
struct ns16550 *uart = port->uart;
int rc;
+
+ if ( uart->irq <= 0 )
+ return;
serial_async_transmit(port);
@@ -213,6 +216,24 @@
.getc = ns16550_getc
};
+static int parse_parity_char(int c)
+{
+ switch ( c )
+ {
+ case 'n':
+ return PARITY_NONE;
+ case 'o':
+ return PARITY_ODD;
+ case 'e':
+ return PARITY_EVEN;
+ case 'm':
+ return PARITY_MARK;
+ case 's':
+ return PARITY_SPACE;
+ }
+ return 0;
+}
+
#define PARSE_ERR(_f, _a...) \
do { \
printk( "ERROR: " _f "\n" , ## _a ); \
@@ -221,49 +242,24 @@
static void ns16550_parse_port_config(struct ns16550 *uart, char *conf)
{
- if ( *conf == '\0' )
- return;
-
- uart->baud = simple_strtol(conf, &conf, 10);
- if ( (uart->baud < 1200) || (uart->baud > 115200) )
- PARSE_ERR("Baud rate %d outside supported range.", uart->baud);
+ int baud;
+
+ if ( (conf == NULL) || (*conf == '\0') )
+ goto config_parsed;
+
+ if ( (baud = simple_strtol(conf, &conf, 10)) != 0 )
+ uart->baud = baud;
if ( *conf != ',' )
- PARSE_ERR("Missing data/parity/stop specifiers.");
-
+ goto config_parsed;
conf++;
uart->data_bits = simple_strtol(conf, &conf, 10);
- if ( (uart->data_bits < 5) || (uart->data_bits > 8) )
- PARSE_ERR("%d data bits are unsupported.", uart->data_bits);
-
- switch ( *conf )
- {
- case 'n':
- uart->parity = PARITY_NONE;
- break;
- case 'o':
- uart->parity = PARITY_ODD;
- break;
- case 'e':
- uart->parity = PARITY_EVEN;
- break;
- case 'm':
- uart->parity = PARITY_MARK;
- break;
- case 's':
- uart->parity = PARITY_SPACE;
- break;
-
- default:
- PARSE_ERR("Invalid parity specifier '%c'.", *conf);
- }
-
+
+ uart->parity = parse_parity_char(*conf);
conf++;
uart->stop_bits = simple_strtol(conf, &conf, 10);
- if ( (uart->stop_bits < 1) || (uart->stop_bits > 2) )
- PARSE_ERR("%d stop bits are unsupported.", uart->stop_bits);
if ( *conf == ',' )
{
@@ -277,13 +273,39 @@
}
}
+ config_parsed:
+ /* Sanity checks. */
+ if ( (uart->baud != 0) && ((uart->baud < 1200) || (uart->baud > 115200)) )
+ PARSE_ERR("Baud rate %d outside supported range.", uart->baud);
+ if ( (uart->data_bits < 5) || (uart->data_bits > 8) )
+ PARSE_ERR("%d data bits are unsupported.", uart->data_bits);
+ if ( (uart->stop_bits < 1) || (uart->stop_bits > 2) )
+ PARSE_ERR("%d stop bits are unsupported.", uart->stop_bits);
+ if ( uart->io_base == 0 )
+ PARSE_ERR("I/O base address must be specified.");
+
+ /* Register with generic serial driver. */
serial_register_uart(uart - ns16550_com, &ns16550_driver, uart);
}
-void ns16550_init(void)
-{
- ns16550_parse_port_config(&ns16550_com[0], opt_com1);
- ns16550_parse_port_config(&ns16550_com[1], opt_com2);
+void ns16550_init(int index, struct ns16550_defaults *defaults)
+{
+ struct ns16550 *uart = &ns16550_com[index];
+
+ if ( (index < 0) || (index > 1) )
+ return;
+
+ if ( defaults != NULL )
+ {
+ uart->baud = defaults->baud;
+ uart->data_bits = defaults->data_bits;
+ uart->parity = parse_parity_char(defaults->parity);
+ uart->stop_bits = defaults->stop_bits;
+ uart->irq = defaults->irq;
+ uart->io_base = defaults->io_base;
+ }
+
+ ns16550_parse_port_config(uart, (index == 0) ? opt_com1 : opt_com2);
}
/*
diff -r 9b77ba29108d -r 64f26eed8d47 xen/arch/ia64/pcdp.c
--- a/xen/arch/ia64/pcdp.c Thu Jul 14 08:00:55 2005
+++ b/xen/arch/ia64/pcdp.c Thu Jul 14 09:05:22 2005
@@ -24,11 +24,11 @@
setup_serial_console(struct pcdp_uart *uart)
{
#ifdef XEN
- extern char opt_com1[1];
- if (opt_com1[0]) return 0;
- sprintf(&opt_com1[0], "%lu,%dn1,0x%lx,9",
- uart->baud, uart->bits ? uart->bits : 8,
- uart->addr.address);
+ extern struct ns16550_defaults ns16550_com1;
+ ns16550_com1.baud = uart->baud;
+ ns16550_com1.io_base = uart->addr.address;
+ if (uart->bits)
+ ns16550_com1.data_bits = uart->bits;
return 0;
#else
#ifdef CONFIG_SERIAL_8250_CONSOLE
diff -r 9b77ba29108d -r 64f26eed8d47 xen/arch/ia64/xensetup.c
--- a/xen/arch/ia64/xensetup.c Thu Jul 14 08:00:55 2005
+++ b/xen/arch/ia64/xensetup.c Thu Jul 14 09:05:22 2005
@@ -131,6 +131,12 @@
return;
}
+struct ns16550_defaults ns16550_com1 = {
+ .data_bits = 8,
+ .parity = 'n',
+ .stop_bits = 1
+};
+
void start_kernel(void)
{
unsigned char *cmdline;
@@ -153,7 +159,7 @@
/* We initialise the serial devices very early so we can get debugging. */
if (running_on_sim) hpsim_serial_init();
- else ns16550_init();
+ else ns16550_init(0, &ns16550_com1);
serial_init_preirq();
init_console();
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