[PATCH 09/41] drivers: tty: serial: sb1250-duart: fill mapsize and use it

[Enrico Weigelt, metux IT consult]

Fill the struct uart_port->mapsize field and use it, insteaf of
hardcoded values in many places. This makes the code layout a bit
more consistent and easily allows using generic helpers for the
io memory handling.

Candidates for such helpers could be eg. the request+ioremap and
iounmap+release combinations.

Signed-off-by: Enrico Weigelt <i...@metux.net>
---
 drivers/tty/serial/sb1250-duart.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/sb1250-duart.c 
b/drivers/tty/serial/sb1250-duart.c
index 227af87..1184226 100644
--- a/drivers/tty/serial/sb1250-duart.c
+++ b/drivers/tty/serial/sb1250-duart.c
@@ -658,7 +658,7 @@ static void sbd_release_port(struct uart_port *uport)
 
        if(refcount_dec_and_test(&duart->map_guard))
                release_mem_region(duart->mapctrl, DUART_CHANREG_SPACING);
-       release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
+       release_mem_region(uport->mapbase, uport->mapsize);
 }
 
 static int sbd_map_port(struct uart_port *uport)
@@ -668,7 +668,7 @@ static int sbd_map_port(struct uart_port *uport)
 
        if (!uport->membase)
                uport->membase = ioremap_nocache(uport->mapbase,
-                                                DUART_CHANREG_SPACING);
+                                                uport->mapsize);
        if (!uport->membase) {
                dev_err(uport->dev, "Cannot map MMIO (base)\n");
                return -ENOMEM;
@@ -693,7 +693,7 @@ static int sbd_request_port(struct uart_port *uport)
        struct sbd_duart *duart = to_sport(uport)->duart;
        int ret = 0;
 
-       if (!request_mem_region(uport->mapbase, DUART_CHANREG_SPACING,
+       if (!request_mem_region(uport->mapbase, uport->mapsize,
                                "sb1250-duart")) {
                pr_err(err);
                return -EBUSY;
@@ -716,7 +716,7 @@ static int sbd_request_port(struct uart_port *uport)
                }
        }
        if (ret) {
-               release_mem_region(uport->mapbase, DUART_CHANREG_SPACING);
+               release_mem_region(uport->mapbase, uport->mapsize);
                return ret;
        }
        return 0;
@@ -812,6 +812,7 @@ static void __init sbd_probe_duarts(void)
                        uport->ops      = &sbd_ops;
                        uport->line     = line;
                        uport->mapbase  = SBD_CHANREGS(line);
+                       uport->mapsize  = DUART_CHANREG_SPACING;
                }
        }
 }
-- 
1.9.1