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path: root/drivers/net/ibm_emac/ibm_emac_tah.c
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Diffstat (limited to 'drivers/net/ibm_emac/ibm_emac_tah.c')
-rw-r--r--drivers/net/ibm_emac/ibm_emac_tah.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/net/ibm_emac/ibm_emac_tah.c b/drivers/net/ibm_emac/ibm_emac_tah.c
new file mode 100644
index 00000000000..af08afc22f9
--- /dev/null
+++ b/drivers/net/ibm_emac/ibm_emac_tah.c
@@ -0,0 +1,111 @@
+/*
+ * drivers/net/ibm_emac/ibm_emac_tah.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, TAH support.
+ *
+ * Copyright 2004 MontaVista Software, Inc.
+ * Matt Porter <mporter@kernel.crashing.org>
+ *
+ * Copyright (c) 2005 Eugene Surovegin <ebs@ebshome.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#include <linux/config.h>
+#include <asm/io.h>
+
+#include "ibm_emac_core.h"
+
+static int __init tah_init(struct ocp_device *ocpdev)
+{
+ struct tah_regs *p;
+
+ if (ocp_get_drvdata(ocpdev)) {
+ printk(KERN_ERR "tah%d: already in use!\n", ocpdev->def->index);
+ return -EBUSY;
+ }
+
+ /* Initialize TAH and enable IPv4 checksum verification, no TSO yet */
+ p = (struct tah_regs *)ioremap(ocpdev->def->paddr, sizeof(*p));
+ if (!p) {
+ printk(KERN_ERR "tah%d: could not ioremap device registers!\n",
+ ocpdev->def->index);
+ return -ENOMEM;
+ }
+ ocp_set_drvdata(ocpdev, p);
+ __tah_reset(ocpdev);
+
+ return 0;
+}
+
+int __init tah_attach(void *emac)
+{
+ struct ocp_enet_private *dev = emac;
+ struct ocp_func_emac_data *emacdata = dev->def->additions;
+
+ /* Check if we need to attach to a TAH */
+ if (emacdata->tah_idx >= 0) {
+ dev->tah_dev = ocp_find_device(OCP_ANY_ID, OCP_FUNC_TAH,
+ emacdata->tah_idx);
+ if (!dev->tah_dev) {
+ printk(KERN_ERR "emac%d: unknown tah%d!\n",
+ dev->def->index, emacdata->tah_idx);
+ return -ENODEV;
+ }
+ if (tah_init(dev->tah_dev)) {
+ printk(KERN_ERR
+ "emac%d: tah%d initialization failed!\n",
+ dev->def->index, emacdata->tah_idx);
+ return -ENODEV;
+ }
+ }
+ return 0;
+}
+
+void __exit __tah_fini(struct ocp_device *ocpdev)
+{
+ struct tah_regs *p = ocp_get_drvdata(ocpdev);
+ BUG_ON(!p);
+ ocp_set_drvdata(ocpdev, NULL);
+ iounmap((void *)p);
+}
+
+void __tah_reset(struct ocp_device *ocpdev)
+{
+ struct tah_regs *p = ocp_get_drvdata(ocpdev);
+ int n;
+
+ /* Reset TAH */
+ out_be32(&p->mr, TAH_MR_SR);
+ n = 100;
+ while ((in_be32(&p->mr) & TAH_MR_SR) && n)
+ --n;
+
+ if (unlikely(!n))
+ printk(KERN_ERR "tah%d: reset timeout\n", ocpdev->def->index);
+
+ /* 10KB TAH TX FIFO accomodates the max MTU of 9000 */
+ out_be32(&p->mr,
+ TAH_MR_CVR | TAH_MR_ST_768 | TAH_MR_TFS_10KB | TAH_MR_DTFP |
+ TAH_MR_DIG);
+}
+
+int __tah_get_regs_len(struct ocp_device *ocpdev)
+{
+ return sizeof(struct emac_ethtool_regs_subhdr) +
+ sizeof(struct tah_regs);
+}
+
+void *tah_dump_regs(struct ocp_device *ocpdev, void *buf)
+{
+ struct tah_regs *dev = ocp_get_drvdata(ocpdev);
+ struct emac_ethtool_regs_subhdr *hdr = buf;
+ struct tah_regs *regs = (struct tah_regs *)(hdr + 1);
+
+ hdr->version = 0;
+ hdr->index = ocpdev->def->index;
+ memcpy_fromio(regs, dev, sizeof(struct tah_regs));
+ return regs + 1;
+}