[PATCH] Add platform driver support to the CS890x driver

[Jaccon Bastiaansen]

The CS89x0 ethernet controller is used on a number of evaluation
boards, such as the MX31ADS. The current driver has memory address and
IRQ settings for each board on which this controller is used. Driver
updates are therefore required to support other boards that also use
the CS89x0. To avoid these driver updates, a better mechanism
(platform driver support) is added to communicate the board dependent
settings to the driver.

Signed-off-by: Jaccon Bastiaansen <jaccon.bastiaansen at gmail.com>
---
 drivers/net/Kconfig  |   18 +++++++++--
 drivers/net/Space.c  |    2 +-
 drivers/net/cs89x0.c |   83 ++++++++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 96 insertions(+), 7 deletions(-)

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 93359fa..17be84f 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1497,8 +1497,7 @@ config FORCEDETH
 
 config CS89x0
 	tristate "CS89x0 support"
-	depends on NET_ETHERNET && (ISA || EISA || MACH_IXDP2351 \
-		|| ARCH_IXDP2X01 || MACH_MX31ADS || MACH_QQ2440)
+	depends on NET_ETHERNET
 	---help---
 	  Support for CS89x0 chipset based Ethernet cards. If you have a
 	  network (Ethernet) card of this type, say Y and read the
@@ -1509,10 +1508,23 @@ config CS89x0
 	  To compile this driver as a module, choose M here. The module
 	  will be called cs89x0.
 
+config CS89x0_PLATFORM
+	bool "CS89x0 platform driver support"
+	depends on CS89x0
+	default n
+	help
+	  Say Y to compile the cs890x0 driver as a platform driver. This
+	  makes this driver suitable for use on certain evaluation boards
+	  such as the IMX21ADS.
+
+	  If you are unsure, say N.
+
 config CS89x0_NONISA_IRQ
 	def_bool y
 	depends on CS89x0 != n
-	depends on MACH_IXDP2351 || ARCH_IXDP2X01 || MACH_MX31ADS || MACH_QQ2440
+	depends on MACH_IXDP2351 || ARCH_IXDP2X01 || MACH_MX31ADS || \
+		   MACH_QQ2440 || CS89x0_PLATFORM
+
 
 config TC35815
 	tristate "TOSHIBA TC35815 Ethernet support"
diff --git a/drivers/net/Space.c b/drivers/net/Space.c
index 068c356..3c53ab1 100644
--- a/drivers/net/Space.c
+++ b/drivers/net/Space.c
@@ -189,7 +189,7 @@ static struct devprobe2 isa_probes[] __initdata = {
 #ifdef CONFIG_SEEQ8005
 	{seeq8005_probe, 0},
 #endif
-#ifdef CONFIG_CS89x0
+#if defined(CONFIG_CS89x0) && !defined(CONFIG_CS89x0_PLATFORM)
  	{cs89x0_probe, 0},
 #endif
 #ifdef CONFIG_AT1700
diff --git a/drivers/net/cs89x0.c b/drivers/net/cs89x0.c
index 537a4b2..604c828 100644
--- a/drivers/net/cs89x0.c
+++ b/drivers/net/cs89x0.c
@@ -98,6 +98,8 @@
   Domenico Andreoli : cavokz at gmail.com
                     : QQ2440 platform support
 
+  Jaccon Bastiaansen: jaccon.bastiaansen at gmail.com
+		    : added platform driver support
 */
 
 /* Always include 'config.h' first in case the user wants to turn on
@@ -154,7 +156,9 @@
 #if ALLOW_DMA
 #include <asm/dma.h>
 #endif
-
+#ifdef CONFIG_CS89x0_PLATFORM
+#include <linux/platform_device.h>
+#endif
 #include "cs89x0.h"
 
 static char version[] __initdata =
@@ -189,6 +193,9 @@ static unsigned int netcard_portlist[] __used __initdata = {
 	PBC_BASE_ADDRESS + PBC_CS8900A_IOBASE + 0x300, 0
 };
 static unsigned cs8900_irq_map[] = {EXPIO_INT_ENET_INT, 0, 0, 0};
+#elif defined(CONFIG_CS89x0_PLATFORM)
+static unsigned int netcard_portlist[] __used __initdata = {0, 0};
+static unsigned int cs8900_irq_map[] = {0, 0, 0, 0};
 #else
 static unsigned int netcard_portlist[] __used __initdata =
    { 0x300, 0x320, 0x340, 0x360, 0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0};
@@ -1746,7 +1753,7 @@ static int set_mac_address(struct net_device *dev, void *p)
 	return 0;
 }
 
-#ifdef MODULE
+#if defined(MODULE) && !defined(CONFIG_CS89x0_PLATFORM)
 
 static struct net_device *dev_cs89x0;
 
@@ -1900,7 +1907,77 @@ cleanup_module(void)
 	release_region(dev_cs89x0->base_addr, NETCARD_IO_EXTENT);
 	free_netdev(dev_cs89x0);
 }
-#endif /* MODULE */
+#endif /* MODULE && !CONFIG_CS89x0_PLATFORM */
+
+#ifdef CONFIG_CS89x0_PLATFORM
+static int cs89x0_platform_probe(struct platform_device *pdev)
+{
+	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
+	struct resource *mem_res;
+	struct resource *irq_res;
+	int err;
+
+	if (!dev)
+		return -ENODEV;
+
+	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (mem_res == NULL || irq_res == NULL) {
+		printk(KERN_WARNING
+		       DRV_NAME
+		       ": memory and/or interrupt resource missing.\n");
+		err = -ENOENT;
+		goto out;
+	}
+
+	cs8900_irq_map[0] = irq_res->start;
+	err = cs89x0_probe1(dev, mem_res->start, 0);
+	if (err) {
+		printk(KERN_WARNING
+		       DRV_NAME
+		       ": no cs8900 or cs8920 detected.\n");
+		goto out;
+	}
+
+	platform_set_drvdata(pdev, dev);
+	return 0;
+out:
+	free_netdev(dev);
+	return err;
+}
+
+static int cs89x0_platform_remove(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+
+	unregister_netdev(dev);
+	free_netdev(dev);
+	return 0;
+}
+
+static struct platform_driver cs89x0_platform_driver = {
+	.driver	= {
+		.name	= DRV_NAME,
+		.owner	= THIS_MODULE,
+	},
+	.probe	= cs89x0_platform_probe,
+	.remove	= cs89x0_platform_remove,
+};
+
+static int __init cs89x0_init(void)
+{
+	return platform_driver_register(&cs89x0_platform_driver);
+}
+
+static void __exit cs89x0_cleanup(void)
+{
+	platform_driver_unregister(&cs89x0_platform_driver);
+}
+
+module_init(cs89x0_init);
+module_exit(cs89x0_cleanup);
+
+#endif
 
 /*
  * Local variables:
-- 
1.7.1