[SERIAL] Make the number of UARTs registered configurable.
Also add a nr_uarts module option to the 8250 code to override this, up to a maximum of CONFIG_SERIAL_8250_NR_UARTS This should appease people who complain about a proliferation of /dev/ttyS & /sysfs nodes whilst at the same time allowing a single kernel image to support the rarer occasions of lots of devices. Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Dave Jones
Russell King
parent
f61051cd2f
commit
a61c2d78ce
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@ -998,6 +998,8 @@ running once the system is up.
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nowb [ARM]
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nr_uarts= [SERIAL] maximum number of UARTs to be registered.
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opl3= [HW,OSS]
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Format: <io>
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@ -54,6 +54,8 @@
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*/
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static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
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static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
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/*
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* Debugging.
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*/
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@ -2118,7 +2120,7 @@ static void __init serial8250_isa_init_ports(void)
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return;
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first = 0;
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for (i = 0; i < UART_NR; i++) {
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for (i = 0; i < nr_uarts; i++) {
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struct uart_8250_port *up = &serial8250_ports[i];
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up->port.line = i;
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@ -2137,7 +2139,7 @@ static void __init serial8250_isa_init_ports(void)
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}
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for (i = 0, up = serial8250_ports;
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i < ARRAY_SIZE(old_serial_port) && i < UART_NR;
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i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
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i++, up++) {
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up->port.iobase = old_serial_port[i].port;
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up->port.irq = irq_canonicalize(old_serial_port[i].irq);
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@ -2159,7 +2161,7 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev)
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serial8250_isa_init_ports();
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for (i = 0; i < UART_NR; i++) {
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for (i = 0; i < nr_uarts; i++) {
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struct uart_8250_port *up = &serial8250_ports[i];
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up->port.dev = dev;
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@ -2262,7 +2264,7 @@ static int serial8250_console_setup(struct console *co, char *options)
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* if so, search for the first available port that does have
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* console support.
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*/
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if (co->index >= UART_NR)
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if (co->index >= nr_uarts)
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co->index = 0;
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port = &serial8250_ports[co->index].port;
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if (!port->iobase && !port->membase)
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@ -2298,7 +2300,7 @@ static int __init find_port(struct uart_port *p)
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int line;
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struct uart_port *port;
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for (line = 0; line < UART_NR; line++) {
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for (line = 0; line < nr_uarts; line++) {
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port = &serial8250_ports[line].port;
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if (uart_match_port(p, port))
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return line;
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@ -2420,7 +2422,7 @@ static int __devexit serial8250_remove(struct platform_device *dev)
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{
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int i;
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for (i = 0; i < UART_NR; i++) {
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for (i = 0; i < nr_uarts; i++) {
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struct uart_8250_port *up = &serial8250_ports[i];
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if (up->port.dev == &dev->dev)
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@ -2487,7 +2489,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
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/*
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* First, find a port entry which matches.
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*/
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for (i = 0; i < UART_NR; i++)
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for (i = 0; i < nr_uarts; i++)
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if (uart_match_port(&serial8250_ports[i].port, port))
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return &serial8250_ports[i];
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@ -2496,7 +2498,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
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* free entry. We look for one which hasn't been previously
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* used (indicated by zero iobase).
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*/
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for (i = 0; i < UART_NR; i++)
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for (i = 0; i < nr_uarts; i++)
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if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
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serial8250_ports[i].port.iobase == 0)
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return &serial8250_ports[i];
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@ -2505,7 +2507,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
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* That also failed. Last resort is to find any entry which
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* doesn't have a real port associated with it.
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*/
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for (i = 0; i < UART_NR; i++)
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for (i = 0; i < nr_uarts; i++)
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if (serial8250_ports[i].port.type == PORT_UNKNOWN)
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return &serial8250_ports[i];
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@ -2590,8 +2592,11 @@ static int __init serial8250_init(void)
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{
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int ret, i;
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if (nr_uarts > UART_NR)
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nr_uarts = UART_NR;
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printk(KERN_INFO "Serial: 8250/16550 driver $Revision: 1.90 $ "
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"%d ports, IRQ sharing %sabled\n", (int) UART_NR,
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"%d ports, IRQ sharing %sabled\n", nr_uarts,
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share_irqs ? "en" : "dis");
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for (i = 0; i < NR_IRQS; i++)
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@ -2651,6 +2656,9 @@ module_param(share_irqs, uint, 0644);
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MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices"
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" (unsafe)");
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module_param(nr_uarts, uint, 0644);
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MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
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#ifdef CONFIG_SERIAL_8250_RSA
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module_param_array(probe_rsa, ulong, &probe_rsa_count, 0444);
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MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
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@ -95,6 +95,16 @@ config SERIAL_8250_NR_UARTS
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PCI enumeration and any ports that may be added at run-time
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via hot-plug, or any ISA multi-port serial cards.
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config SERIAL_8250_RUNTIME_UARTS
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int "Number of 8250/16550 serial ports to register at runtime"
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depends on SERIAL_8250
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default "4"
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help
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Set this to the maximum number of serial ports you want
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the kernel to register at boot time. This can be overriden
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with the module parameter "nr_uarts", or boot-time parameter
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8250.nr_uarts
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config SERIAL_8250_EXTENDED
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bool "Extended 8250/16550 serial driver options"
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depends on SERIAL_8250
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