Use resource_size_t for serial port IO addresses

At present, various parts of the serial code use unsigned long to define
resource addresses.  This is a problem, because some 32-bit platforms have
physical addresses larger than 32-bits, and have mmio serial uarts located
above the 4GB point.

This patch changes the type of mapbase in both struct uart_port and struct
plat_serial8250_port to resource_size_t, which can be configured to be 64
bits on such platforms.  The mapbase in serial_struct can't safely be
changed, because that structure is user visible.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 9c57486c2e7..030a6063541 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -626,7 +626,7 @@ static int uart_get_info(struct uart_state *state,
         tmp.hub6            = port->hub6;
         tmp.io_type         = port->iotype;
         tmp.iomem_reg_shift = port->regshift;
-        tmp.iomem_base      = (void *)port->mapbase;
+        tmp.iomem_base      = (void *)(unsigned long)port->mapbase;
 
         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
                 return -EFAULT;
@@ -1666,10 +1666,11 @@ static int uart_line_info(char *buf, struct uart_driver *drv, int i)
                 return 0;
 
         mmio = port->iotype >= UPIO_MEM;
-        ret = sprintf(buf, "%d: uart:%s %s%08lX irq:%d",
+        ret = sprintf(buf, "%d: uart:%s %s%08llX irq:%d",
                         port->line, uart_type(port),
                         mmio ? "mmio:0x" : "port:",
-                        mmio ? port->mapbase : (unsigned long) port->iobase,
+                        mmio ? (unsigned long long)port->mapbase
+                             : (unsigned long long) port->iobase,
                         port->irq);
 
         if (port->type == PORT_UNKNOWN) {
@@ -2069,7 +2070,7 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port)
         case UPIO_TSI:
         case UPIO_DWAPB:
                 snprintf(address, sizeof(address),
-                         "MMIO 0x%lx", port->mapbase);
+                         "MMIO 0x%llx", (unsigned long long)port->mapbase);
                 break;
         default:
                 strlcpy(address, "*unknown*", sizeof(address));