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Commit c35ec6da authored by Russell King's avatar Russell King
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[SERIAL] 8250: Fix resource handling. 

serial8250_request_std_resource() is now responsible for claiming
the standard resources, _and_ calling ioremap if necessary.
serial8250_release_std_resource() performs the complementary function
in its entirety.
serial8250_*_rsa_resource() perform the similar operations for RSA
ports, with the exception that RSA ports can only be mapped into IO
space.
parent c1d0b9d9
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Showing with 69 additions and 90 deletions
drivers/serial/8250.c
View file @ c35ec6da
......@@ -1732,147 +1732,130 @@ serial8250_pm(struct uart_port *port, unsigned int state,
}
/*
* Resource handling. This is complicated by the fact that resources
* depend on the port type. Maybe we should be claiming the standard
* 8250 ports, and then trying to get other resources as necessary?
* Resource handling.
*/
static int
serial8250_request_std_resource(struct uart_8250_port *up, struct resource **res)
static int serial8250_request_std_resource(struct uart_8250_port *up)
{
unsigned int size = 8 << up->port.regshift;
int ret = 0;
switch (up->port.iotype) {
case UPIO_MEM:
if (up->port.mapbase) {
*res = request_mem_region(up->port.mapbase, size, "serial");
if (!*res)
if (!up->port.mapbase)
break;
if (!request_mem_region(up->port.mapbase, size, "serial")) {
ret = -EBUSY;
break;
}
if (up->port.flags & UPF_IOREMAP) {
up->port.membase = ioremap(up->port.mapbase, size);
if (!up->port.membase) {
release_mem_region(up->port.mapbase, size);
ret = -ENOMEM;
}
}
break;
case UPIO_HUB6:
case UPIO_PORT:
*res = request_region(up->port.iobase, size, "serial");
if (!*res)
if (!request_region(up->port.iobase, size, "serial"))
ret = -EBUSY;
break;
}
return ret;
}
static int
serial8250_request_rsa_resource(struct uart_8250_port *up, struct resource **res)
static void serial8250_release_std_resource(struct uart_8250_port *up)
{
unsigned int size = 8 << up->port.regshift;
unsigned long start;
int ret = 0;
switch (up->port.iotype) {
case UPIO_MEM:
if (up->port.mapbase) {
start = up->port.mapbase;
start += UART_RSA_BASE << up->port.regshift;
*res = request_mem_region(start, size, "serial-rsa");
if (!*res)
ret = -EBUSY;
if (!up->port.mapbase)
break;
if (up->port.flags & UPF_IOREMAP) {
iounmap(up->port.membase);
up->port.membase = NULL;
}
release_mem_region(up->port.mapbase, size);
break;
case UPIO_HUB6:
case UPIO_PORT:
start = up->port.iobase;
start += UART_RSA_BASE << up->port.regshift;
*res = request_region(start, size, "serial-rsa");
if (!*res)
ret = -EBUSY;
release_region(up->port.iobase, size);
break;
}
return ret;
}
static void serial8250_release_port(struct uart_port *port)
static int serial8250_request_rsa_resource(struct uart_8250_port *up)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
unsigned long start, offset = 0, size = 0;
if (up->port.type == PORT_RSA) {
offset = UART_RSA_BASE << up->port.regshift;
size = 8;
}
size <<= up->port.regshift;
unsigned long start = UART_RSA_BASE << up->port.regshift;
unsigned int size = 8 << up->port.regshift;
int ret = 0;
switch (up->port.iotype) {
case UPIO_MEM:
if (up->port.mapbase) {
/*
* Unmap the area.
*/
iounmap(up->port.membase);
up->port.membase = NULL;
start = up->port.mapbase;
if (size)
release_mem_region(start + offset, size);
release_mem_region(start, 8 << up->port.regshift);
}
ret = -EINVAL;
break;
case UPIO_HUB6:
case UPIO_PORT:
start = up->port.iobase;
start += up->port.iobase;
if (!request_region(start, size, "serial-rsa"))
ret = -EBUSY;
break;
}
return ret;
}
if (size)
release_region(start + offset, size);
release_region(start + offset, 8 << up->port.regshift);
static void serial8250_release_rsa_resource(struct uart_8250_port *up)
{
unsigned long offset = UART_RSA_BASE << up->port.regshift;
unsigned int size = 8 << up->port.regshift;
switch (up->port.iotype) {
case UPIO_MEM:
break;
default:
case UPIO_HUB6:
case UPIO_PORT:
release_region(up->port.iobase + offset, size);
break;
}
}
static void serial8250_release_port(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
serial8250_release_std_resource(up);
if (up->port.type == PORT_RSA)
serial8250_release_rsa_resource(up);
}
static int serial8250_request_port(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct resource *res = NULL, *res_rsa = NULL;
int ret = 0;
if (up->port.type == PORT_RSA) {
ret = serial8250_request_rsa_resource(up, &res_rsa);
ret = serial8250_request_std_resource(up);
if (ret == 0 && up->port.type == PORT_RSA) {
ret = serial8250_request_rsa_resource(up);
if (ret < 0)
return ret;
serial8250_release_std_resource(up);
}
ret = serial8250_request_std_resource(up, &res);
/*
* If we have a mapbase, then request that as well.
*/
if (ret == 0 && up->port.flags & UPF_IOREMAP) {
int size = res->end - res->start + 1;
up->port.membase = ioremap(up->port.mapbase, size);
if (!up->port.membase)
ret = -ENOMEM;
}
if (ret < 0) {
if (res_rsa)
release_resource(res_rsa);
if (res)
release_resource(res);
}
return ret;
}
static void serial8250_config_port(struct uart_port *port, int flags)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct resource *res_std = NULL, *res_rsa = NULL;
int probeflags = PROBE_ANY;
int ret;
......@@ -1888,11 +1871,11 @@ static void serial8250_config_port(struct uart_port *port, int flags)
* Find the region that we can probe for. This in turn
* tells us whether we can probe for the type of port.
*/
ret = serial8250_request_std_resource(up, &res_std);
ret = serial8250_request_std_resource(up);
if (ret < 0)
return;
ret = serial8250_request_rsa_resource(up, &res_rsa);
ret = serial8250_request_rsa_resource(up);
if (ret < 0)
probeflags &= ~PROBE_RSA;
......@@ -1901,14 +1884,10 @@ static void serial8250_config_port(struct uart_port *port, int flags)
if (up->port.type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ)
autoconfig_irq(up);
/*
* If the port wasn't an RSA port, release the resource.
*/
if (up->port.type != PORT_RSA && res_rsa)
release_resource(res_rsa);
if (up->port.type == PORT_UNKNOWN && res_std)
release_resource(res_std);
if (up->port.type != PORT_RSA && probeflags & PROBE_RSA)
serial8250_release_rsa_resource(up);
if (up->port.type == PORT_UNKNOWN)
serial8250_release_std_resource(up);
}
static int
......
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