linux-kernel - [PATCH 34/41] drivers: tty: serial: zs: fill mapsize and use it

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Date:   Sat, 27 Apr 2019 14:52:15 +0200
From:   "Enrico Weigelt, metux IT consult" <info@...ux.net>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, andrew@...id.au,
        andriy.shevchenko@...ux.intel.com, macro@...ux-mips.org,
        vz@...ia.com, slemieux.tyco@...il.com, khilman@...libre.com,
        liviu.dudau@....com, sudeep.holla@....com,
        lorenzo.pieralisi@....com, davem@...emloft.net, jacmet@...site.dk,
        linux@...sktech.co.nz, matthias.bgg@...il.com,
        linux-mips@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org
Subject: [PATCH 34/41] drivers: tty: serial: zs: fill mapsize and use it

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 <info@...ux.net>
---
 drivers/tty/serial/zs.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/zs.c b/drivers/tty/serial/zs.c
index adbfe79..ab432ba 100644
--- a/drivers/tty/serial/zs.c
+++ b/drivers/tty/serial/zs.c
@@ -986,14 +986,14 @@ static void zs_release_port(struct uart_port *uport)
 {
 	iounmap(uport->membase);
 	uport->membase = 0;
-	release_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE);
+	release_mem_region(uport->mapbase, uport->mapsize);
 }
 
 static int zs_map_port(struct uart_port *uport)
 {
 	if (!uport->membase)
 		uport->membase = ioremap_nocache(uport->mapbase,
-						 ZS_CHAN_IO_SIZE);
+						 uport->mapsize);
 	if (!uport->membase) {
 		dev_err(port->dev, "zs: Cannot map MMIO\n");
 		return -ENOMEM;
@@ -1005,13 +1005,13 @@ static int zs_request_port(struct uart_port *uport)
 {
 	int ret;
 
-	if (!request_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE, "scc")) {
+	if (!request_mem_region(uport->mapbase, uport->mapsize, "scc")) {
 		dev_err(uport->dev, "zs: Unable to reserve MMIO resource\n");
 		return -EBUSY;
 	}
 	ret = zs_map_port(uport);
 	if (ret) {
-		release_mem_region(uport->mapbase, ZS_CHAN_IO_SIZE);
+		release_mem_region(uport->mapbase, uport->mapsize);
 		return ret;
 	}
 	return 0;
@@ -1113,6 +1113,7 @@ static int __init zs_probe_sccs(void)
 			uport->flags	= UPF_BOOT_AUTOCONF;
 			uport->ops	= &zs_ops;
 			uport->line	= chip * ZS_NUM_CHAN + side;
+			uport->mapsize	= ZS_CHAN_IO_SIZE;
 			uport->mapbase	= dec_kn_slot_base +
 					  zs_parms.scc[chip] +
 					  (side ^ ZS_CHAN_B) * ZS_CHAN_IO_SIZE;
-- 
1.9.1