linux-kernel - [PATCH 5/8] drivers: tty: serial: introduce struct resource

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Date:   Tue, 12 Mar 2019 15:57:37 +0100
From:   "Enrico Weigelt, metux IT consult" <info@...ux.net>
To:     gregkh@...uxfoundation.org, jslaby@...e.com,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/8] drivers: tty: serial: introduce struct resource

The standard data structure for holding io resources in the
kernel is struct resource. Serial drivers yet don't really
use it (except when retrieving from oftree).

This patch introduces a new field in struct uart_port for that,
plus several helpers. Yet it's up to the individual drivers for
using it - serial_core doesn't care yet. Therefore, the old fields
mapbase and mapsize need to be filled properly by the drivers.
---
 include/linux/serial_core.h | 49 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 5fe2b03..9b07a40 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -24,6 +24,7 @@
 #include <linux/compiler.h>
 #include <linux/console.h>
 #include <linux/interrupt.h>
+#include <linux/ioport.h>
 #include <linux/circ_buf.h>
 #include <linux/spinlock.h>
 #include <linux/sched.h>
@@ -256,6 +257,7 @@ struct uart_port {
 	unsigned int		minor;
 	resource_size_t		mapbase;		/* for ioremap */
 	resource_size_t		mapsize;
+	struct resource		memres;
 	struct device		*dev;			/* parent device */
 	unsigned char		hub6;			/* this should be in the 8250 driver */
 	unsigned char		suspended;
@@ -427,6 +429,53 @@ void uart_console_write(struct uart_port *port, const char *s,
 int uart_match_port(struct uart_port *port1, struct uart_port *port2);
 
 /*
+ * Port resource management
+ */
+static inline void uart_memres_set(struct uart_port *port,
+				     struct resource res)
+{
+	port->memres = res;
+	port->mapbase = res.start;
+}
+
+static inline void uart_memres_clear(struct uart_port *port)
+{
+	port->memres = DEFINE_RES_MEM(0, 0);
+}
+
+static inline int uart_memres_valid(struct uart_port *port)
+{
+	return (port->memres.start != 0);
+}
+
+static inline struct resource *uart_memres_request(struct uart_port *port,
+				     const char *name)
+{
+	return request_mem_region(
+		port->memres.start,
+		resource_size(&port->memres),
+		name);
+}
+
+static inline void uart_memres_release(struct uart_port *port)
+{
+	return release_mem_region(port->memres.start,
+				  resource_size(&port->memres));
+}
+
+static inline void __iomem *uart_memres_ioremap_nocache(struct uart_port *port)
+{
+	return ioremap_nocache(port->memres.start,
+			       resource_size(&port->memres.start));
+}
+
+static inline void __iomem *uart_memres_ioremap(struct uart_port *port)
+{
+	return ioremap(port->memres.start,
+		       resource_size(&port->memres.start));
+}
+
+/*
  * Power Management
  */
 int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
-- 
1.9.1