Ethernet driver for EISA only SNI RM200/RM400 machines

Changes to last version:
- spelling fix
- cleaned up probe code

Thomas.

Ethernet driver for EISA only SNI RM200/RM400 machines

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 193 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index dbf773356326..5cc3d517e39b 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -431,6 +431,13 @@ config LASI_82596
           Say Y here to support the builtin Intel 82596 ethernet controller
           found in Hewlett-Packard PA-RISC machines with 10Mbit ethernet.
 
+config SNI_82596
+        tristate "SNI RM ethernet"
+        depends on NET_ETHERNET && SNI_RM
+        help
+          Say Y here to support the on-board Intel 82596 ethernet controller
+          built into SNI RM machines.
+
 config MIPS_JAZZ_SONIC
         tristate "MIPS JAZZ onboard SONIC Ethernet support"
         depends on MACH_JAZZ
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index a77affa4f6e6..eb62fb48e4b7 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -157,6 +157,7 @@ obj-$(CONFIG_ELPLUS) += 3c505.o
 obj-$(CONFIG_AC3200) += ac3200.o 8390.o
 obj-$(CONFIG_APRICOT) += 82596.o
 obj-$(CONFIG_LASI_82596) += lasi_82596.o
+obj-$(CONFIG_SNI_82596) += sni_82596.o
 obj-$(CONFIG_MVME16x_NET) += 82596.o
 obj-$(CONFIG_BVME6000_NET) += 82596.o
 obj-$(CONFIG_SC92031) += sc92031.o
diff --git a/drivers/net/sni_82596.c b/drivers/net/sni_82596.c
new file mode 100644
index 000000000000..2cf6794acb4f
--- /dev/null
+++ b/drivers/net/sni_82596.c
@@ -0,0 +1,185 @@
+/*
+ * sni_82596.c -- driver for intel 82596 ethernet controller, as
+ *                used in older SNI RM machines
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#define SNI_82596_DRIVER_VERSION "SNI RM 82596 driver - Revision: 0.01"
+
+static const char sni_82596_string[] = "snirm_82596";
+
+#define DMA_ALLOC                      dma_alloc_coherent
+#define DMA_FREE                       dma_free_coherent
+#define DMA_WBACK(priv, addr, len)     do { } while (0)
+#define DMA_INV(priv, addr, len)       do { } while (0)
+#define DMA_WBACK_INV(priv, addr, len) do { } while (0)
+
+#define SYSBUS      0x00004400
+
+/* big endian CPU, 82596 little endian */
+#define SWAP32(x)   cpu_to_le32((u32)(x))
+#define SWAP16(x)   cpu_to_le16((u16)(x))
+
+#define OPT_MPU_16BIT    0x01
+
+#include "lib82596.c"
+
+MODULE_AUTHOR("Thomas Bogendoerfer");
+MODULE_DESCRIPTION("i82596 driver");
+MODULE_LICENSE("GPL");
+module_param(i596_debug, int, 0);
+MODULE_PARM_DESC(i596_debug, "82596 debug mask");
+
+static inline void ca(struct net_device *dev)
+{
+        struct i596_private *lp = netdev_priv(dev);
+
+        writel(0, lp->ca);
+}
+
+
+static void mpu_port(struct net_device *dev, int c, dma_addr_t x)
+{
+        struct i596_private *lp = netdev_priv(dev);
+
+        u32 v = (u32) (c) | (u32) (x);
+
+        if (lp->options & OPT_MPU_16BIT) {
+                writew(v & 0xffff, lp->mpu_port);
+                wmb();  /* order writes to MPU port */
+                udelay(1);
+                writew(v >> 16, lp->mpu_port);
+        } else {
+                writel(v, lp->mpu_port);
+                wmb();  /* order writes to MPU port */
+                udelay(1);
+                writel(v, lp->mpu_port);
+        }
+}
+
+
+static int __devinit sni_82596_probe(struct platform_device *dev)
+{
+        struct  net_device *netdevice;
+        struct i596_private *lp;
+        struct  resource *res, *ca, *idprom, *options;
+        int     retval = -ENOMEM;
+        void __iomem *mpu_addr;
+        void __iomem *ca_addr;
+        u8 __iomem *eth_addr;
+
+        res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+        ca = platform_get_resource(dev, IORESOURCE_MEM, 1);
+        options = platform_get_resource(dev, 0, 0);
+        idprom = platform_get_resource(dev, IORESOURCE_MEM, 2);
+        if (!res || !ca || !options || !idprom)
+                return -ENODEV;
+        mpu_addr = ioremap_nocache(res->start, 4);
+        if (!mpu_addr)
+                return -ENOMEM;
+        ca_addr = ioremap_nocache(ca->start, 4);
+        if (!ca_addr)
+                goto probe_failed_free_mpu;
+
+        printk(KERN_INFO "Found i82596 at 0x%x\n", res->start);
+
+        netdevice = alloc_etherdev(sizeof(struct i596_private));
+        if (!netdevice)
+                goto probe_failed_free_ca;
+
+        SET_NETDEV_DEV(netdevice, &dev->dev);
+        platform_set_drvdata (dev, netdevice);
+
+        netdevice->base_addr = res->start;
+        netdevice->irq = platform_get_irq(dev, 0);
+
+        eth_addr = ioremap_nocache(idprom->start, 0x10);
+        if (!eth_addr)
+                goto probe_failed;
+
+        /* someone seems to like messed up stuff */
+        netdevice->dev_addr[0] = readb(eth_addr + 0x0b);
+        netdevice->dev_addr[1] = readb(eth_addr + 0x0a);
+        netdevice->dev_addr[2] = readb(eth_addr + 0x09);
+        netdevice->dev_addr[3] = readb(eth_addr + 0x08);
+        netdevice->dev_addr[4] = readb(eth_addr + 0x07);
+        netdevice->dev_addr[5] = readb(eth_addr + 0x06);
+        iounmap(eth_addr);
+
+        if (!netdevice->irq) {
+                printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
+                        __FILE__, netdevice->base_addr);
+                goto probe_failed;
+        }
+
+        lp = netdev_priv(netdevice);
+        lp->options = options->flags & IORESOURCE_BITS;
+        lp->ca = ca_addr;
+        lp->mpu_port = mpu_addr;
+
+        retval = i82596_probe(netdevice);
+        if (retval == 0)
+                return 0;
+
+probe_failed:
+        free_netdev(netdevice);
+probe_failed_free_ca:
+        iounmap(ca_addr);
+probe_failed_free_mpu:
+        iounmap(mpu_addr);
+        return retval;
+}
+
+static int __devexit sni_82596_driver_remove(struct platform_device *pdev)
+{
+        struct net_device *dev = platform_get_drvdata(pdev);
+        struct i596_private *lp = netdev_priv(dev);
+
+        unregister_netdev(dev);
+        DMA_FREE(dev->dev.parent, sizeof(struct i596_private),
+                 lp->dma, lp->dma_addr);
+        iounmap(lp->ca);
+        iounmap(lp->mpu_port);
+        free_netdev (dev);
+        return 0;
+}
+
+static struct platform_driver sni_82596_driver = {
+        .probe  = sni_82596_probe,
+        .remove = __devexit_p(sni_82596_driver_remove),
+        .driver = {
+                .name   = sni_82596_string,
+        },
+};
+
+static int __devinit sni_82596_init(void)
+{
+        printk(KERN_INFO SNI_82596_DRIVER_VERSION "\n");
+        return platform_driver_register(&sni_82596_driver);
+}
+
+
+static void __exit sni_82596_exit(void)
+{
+        platform_driver_unregister(&sni_82596_driver);
+}
+
+module_init(sni_82596_init);
+module_exit(sni_82596_exit);