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serial: 8250: Decouple RSA probe 

Prepare for 8250 split; separate RSA probe and resource management
from base port operations. Override base port operations for the
config_port(), request_port() and release_port() methods to
implement the optional RSA probe and resource management only in
the universal/legacy 8250 driver.

Introduce 'probe' flags for 8250 ports, which allows drivers higher
up the driver stack to enable optional probes.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-02-24 14:25:14 -05:00 committed by Greg Kroah-Hartman
parent 3b81c26c92
commit 4037539370
3 changed files with 78 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/tty/serial/8250/8250.h
View File

@ -84,9 +84,6 @@ struct serial8250_config {
#define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */
#define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */
#define PROBE_RSA (1 << 0)
#define PROBE_ANY (~0)
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
#ifdef CONFIG_SERIAL_8250_SHARE_IRQ

112
drivers/tty/serial/8250/8250_core.c
View File

@ -1105,7 +1105,7 @@ static void autoconfig_16550a(struct uart_8250_port *up)
* whether or not this UART is a 16550A or not, since this will
* determine whether or not we can use its FIFO features or not.
*/
static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
static void autoconfig(struct uart_8250_port *up)
{
unsigned char status1, scratch, scratch2, scratch3;
unsigned char save_lcr, save_mcr;
@ -1228,7 +1228,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
/*
* Only probe for RSA ports if we got the region.
*/
if (port->type == PORT_16550A && probeflags & PROBE_RSA &&
if (port->type == PORT_16550A && up->probe & UART_PROBE_RSA &&
__enable_rsa(up))
port->type = PORT_RSA;
#endif
@ -2832,10 +2832,6 @@ static void serial8250_release_port(struct uart_port *port)
struct uart_8250_port *up = up_to_u8250p(port);
serial8250_release_std_resource(up);
#ifdef CONFIG_SERIAL_8250_RSA
if (port->type == PORT_RSA)
serial8250_release_rsa_resource(up);
#endif
}
static int serial8250_request_port(struct uart_port *port)
@ -2847,13 +2843,6 @@ static int serial8250_request_port(struct uart_port *port)
return -ENODEV;
ret = serial8250_request_std_resource(up);
#ifdef CONFIG_SERIAL_8250_RSA
if (ret == 0 && port->type == PORT_RSA) {
ret = serial8250_request_rsa_resource(up);
if (ret < 0)
serial8250_release_std_resource(up);
}
#endif
return ret;
}
@ -3001,7 +2990,6 @@ static void register_dev_spec_attr_grp(struct uart_8250_port *up)
static void serial8250_config_port(struct uart_port *port, int flags)
{
struct uart_8250_port *up = up_to_u8250p(port);
int probeflags = 0;
int ret;
if (port->type == PORT_8250_CIR)
@ -3015,28 +3003,11 @@ static void serial8250_config_port(struct uart_port *port, int flags)
if (ret < 0)
return;
#ifdef CONFIG_SERIAL_8250_RSA
if (port->type == PORT_RSA) {
if (serial8250_request_rsa_resource(up) == 0)
probeflags |= PROBE_RSA;
} else if (flags & UART_CONFIG_TYPE) {
int i;
for (i = 0 ; i < probe_rsa_count; ++i) {
if (probe_rsa[i] == port->iobase) {
if (serial8250_request_rsa_resource(up) == 0)
probeflags |= PROBE_RSA;
break;
}
}
}
#endif
if (port->iotype != up->cur_iotype)
set_io_from_upio(port);
if (flags & UART_CONFIG_TYPE)
autoconfig(up, probeflags);
autoconfig(up);
/* if access method is AU, it is a 16550 with a quirk */
if (port->type == PORT_16550A && port->iotype == UPIO_AU)
@ -3049,10 +3020,6 @@ static void serial8250_config_port(struct uart_port *port, int flags)
if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ)
autoconfig_irq(up);
#ifdef CONFIG_SERIAL_8250_RSA
if (port->type != PORT_RSA && probeflags & PROBE_RSA)
serial8250_release_rsa_resource(up);
#endif
if (port->type == PORT_UNKNOWN)
serial8250_release_std_resource(up);
@ -3113,6 +3080,9 @@ static struct uart_ops serial8250_pops = {
#endif
};
static const struct uart_ops *base_ops;
static struct uart_ops univ8250_port_ops;
static const struct uart_8250_ops univ8250_driver_ops = {
.setup_irq = univ8250_setup_irq,
.release_irq = univ8250_release_irq,
@ -3184,6 +3154,69 @@ static void serial8250_set_defaults(struct uart_8250_port *up)
}
}
#ifdef CONFIG_SERIAL_8250_RSA
static void univ8250_config_port(struct uart_port *port, int flags)
{
struct uart_8250_port *up = up_to_u8250p(port);
up->probe &= ~UART_PROBE_RSA;
if (port->type == PORT_RSA) {
if (serial8250_request_rsa_resource(up) == 0)
up->probe |= UART_PROBE_RSA;
} else if (flags & UART_CONFIG_TYPE) {
int i;
for (i = 0; i < probe_rsa_count; i++) {
if (probe_rsa[i] == up->port.iobase) {
if (serial8250_request_rsa_resource(up) == 0)
up->probe |= UART_PROBE_RSA;
break;
}
}
}
base_ops->config_port(port, flags);
if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
serial8250_release_rsa_resource(up);
}
static int univ8250_request_port(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
int ret;
ret = base_ops->request_port(port);
if (ret == 0 && port->type == PORT_RSA) {
ret = serial8250_request_rsa_resource(up);
if (ret < 0)
base_ops->release_port(port);
}
return ret;
}
static void univ8250_release_port(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
if (port->type == PORT_RSA)
serial8250_release_rsa_resource(up);
base_ops->release_port(port);
}
static void univ8250_rsa_support(struct uart_ops *ops)
{
ops->config_port = univ8250_config_port;
ops->request_port = univ8250_request_port;
ops->release_port = univ8250_release_port;
}
#else
#define univ8250_rsa_support(x) do { } while (0)
#endif /* CONFIG_SERIAL_8250_RSA */
static void __init serial8250_isa_init_ports(void)
{
struct uart_8250_port *up;
@ -3203,6 +3236,9 @@ static void __init serial8250_isa_init_ports(void)
port->line = i;
serial8250_init_port(up);
if (!base_ops)
base_ops = port->ops;
port->ops = &univ8250_port_ops;
init_timer(&up->timer);
up->timer.function = serial8250_timeout;
@ -3216,6 +3252,10 @@ static void __init serial8250_isa_init_ports(void)
up->mcr_force = ALPHA_KLUDGE_MCR;
}
/* chain base port ops to support Remote Supervisor Adapter */
univ8250_port_ops = *base_ops;
univ8250_rsa_support(&univ8250_port_ops);
if (share_irqs)
irqflag = IRQF_SHARED;

2
include/linux/serial_8250.h
View File

@ -102,6 +102,8 @@ struct uart_8250_port {
unsigned char canary; /* non-zero during system sleep
* if no_console_suspend
*/
unsigned char probe;
#define UART_PROBE_RSA (1 << 0)
/*
* Some bits in registers are cleared on a read, so they must