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path: root/drivers/net/ibm_newemac/rgmii.c
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Diffstat (limited to 'drivers/net/ibm_newemac/rgmii.c')
-rw-r--r--drivers/net/ibm_newemac/rgmii.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/net/ibm_newemac/rgmii.c b/drivers/net/ibm_newemac/rgmii.c
new file mode 100644
index 00000000000..bcd7fc639c4
--- /dev/null
+++ b/drivers/net/ibm_newemac/rgmii.c
@@ -0,0 +1,323 @@
+/*
+ * drivers/net/ibm_newemac/rgmii.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, RGMII bridge support.
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies.
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * Based on original work by
+ * Matt Porter <mporter@kernel.crashing.org>
+ * Copyright 2004 MontaVista Software, Inc.
+ *
+ * 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/kernel.h>
+#include <linux/ethtool.h>
+#include <asm/io.h>
+
+#include "emac.h"
+#include "debug.h"
+
+// XXX FIXME: Axon seems to support a subset of the RGMII, we
+// thus need to take that into account and possibly change some
+// of the bit settings below that don't seem to quite match the
+// AXON spec
+
+/* RGMIIx_FER */
+#define RGMII_FER_MASK(idx) (0x7 << ((idx) * 4))
+#define RGMII_FER_RTBI(idx) (0x4 << ((idx) * 4))
+#define RGMII_FER_RGMII(idx) (0x5 << ((idx) * 4))
+#define RGMII_FER_TBI(idx) (0x6 << ((idx) * 4))
+#define RGMII_FER_GMII(idx) (0x7 << ((idx) * 4))
+
+/* RGMIIx_SSR */
+#define RGMII_SSR_MASK(idx) (0x7 << ((idx) * 8))
+#define RGMII_SSR_100(idx) (0x2 << ((idx) * 8))
+#define RGMII_SSR_1000(idx) (0x4 << ((idx) * 8))
+
+/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
+static inline int rgmii_valid_mode(int phy_mode)
+{
+ return phy_mode == PHY_MODE_GMII ||
+ phy_mode == PHY_MODE_RGMII ||
+ phy_mode == PHY_MODE_TBI ||
+ phy_mode == PHY_MODE_RTBI;
+}
+
+static inline const char *rgmii_mode_name(int mode)
+{
+ switch (mode) {
+ case PHY_MODE_RGMII:
+ return "RGMII";
+ case PHY_MODE_TBI:
+ return "TBI";
+ case PHY_MODE_GMII:
+ return "GMII";
+ case PHY_MODE_RTBI:
+ return "RTBI";
+ default:
+ BUG();
+ }
+}
+
+static inline u32 rgmii_mode_mask(int mode, int input)
+{
+ switch (mode) {
+ case PHY_MODE_RGMII:
+ return RGMII_FER_RGMII(input);
+ case PHY_MODE_TBI:
+ return RGMII_FER_TBI(input);
+ case PHY_MODE_GMII:
+ return RGMII_FER_GMII(input);
+ case PHY_MODE_RTBI:
+ return RGMII_FER_RTBI(input);
+ default:
+ BUG();
+ }
+}
+
+int __devinit rgmii_attach(struct of_device *ofdev, int input, int mode)
+{
+ struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+ struct rgmii_regs *p = dev->base;
+
+ RGMII_DBG(dev, "attach(%d)" NL, input);
+
+ /* Check if we need to attach to a RGMII */
+ if (input < 0 || !rgmii_valid_mode(mode)) {
+ printk(KERN_ERR "%s: unsupported settings !\n",
+ ofdev->node->full_name);
+ return -ENODEV;
+ }
+
+ mutex_lock(&dev->lock);
+
+ /* Enable this input */
+ out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));
+
+ printk(KERN_NOTICE "%s: input %d in %s mode\n",
+ ofdev->node->full_name, input, rgmii_mode_name(mode));
+
+ ++dev->users;
+
+ mutex_unlock(&dev->lock);
+
+ return 0;
+}
+
+void rgmii_set_speed(struct of_device *ofdev, int input, int speed)
+{
+ struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+ struct rgmii_regs *p = dev->base;
+ u32 ssr;
+
+ mutex_lock(&dev->lock);
+
+ ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);
+
+ RGMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
+
+ if (speed == SPEED_1000)
+ ssr |= RGMII_SSR_1000(input);
+ else if (speed == SPEED_100)
+ ssr |= RGMII_SSR_100(input);
+
+ out_be32(&p->ssr, ssr);
+
+ mutex_unlock(&dev->lock);
+}
+
+void rgmii_get_mdio(struct of_device *ofdev, int input)
+{
+ struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+ struct rgmii_regs *p = dev->base;
+ u32 fer;
+
+ RGMII_DBG2(dev, "get_mdio(%d)" NL, input);
+
+ if (dev->type != RGMII_AXON)
+ return;
+
+ mutex_lock(&dev->lock);
+
+ fer = in_be32(&p->fer);
+ fer |= 0x00080000u >> input;
+ out_be32(&p->fer, fer);
+ (void)in_be32(&p->fer);
+
+ DBG2(dev, " fer = 0x%08x\n", fer);
+}
+
+void rgmii_put_mdio(struct of_device *ofdev, int input)
+{
+ struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+ struct rgmii_regs *p = dev->base;
+ u32 fer;
+
+ RGMII_DBG2(dev, "put_mdio(%d)" NL, input);
+
+ if (dev->type != RGMII_AXON)
+ return;
+
+ fer = in_be32(&p->fer);
+ fer &= ~(0x00080000u >> input);
+ out_be32(&p->fer, fer);
+ (void)in_be32(&p->fer);
+
+ DBG2(dev, " fer = 0x%08x\n", fer);
+
+ mutex_unlock(&dev->lock);
+}
+
+void __devexit rgmii_detach(struct of_device *ofdev, int input)
+{
+ struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+ struct rgmii_regs *p = dev->base;
+
+ mutex_lock(&dev->lock);
+
+ BUG_ON(!dev || dev->users == 0);
+
+ RGMII_DBG(dev, "detach(%d)" NL, input);
+
+ /* Disable this input */
+ out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));
+
+ --dev->users;
+
+ mutex_unlock(&dev->lock);
+}
+
+int rgmii_get_regs_len(struct of_device *ofdev)
+{
+ return sizeof(struct emac_ethtool_regs_subhdr) +
+ sizeof(struct rgmii_regs);
+}
+
+void *rgmii_dump_regs(struct of_device *ofdev, void *buf)
+{
+ struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+ struct emac_ethtool_regs_subhdr *hdr = buf;
+ struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);
+
+ hdr->version = 0;
+ hdr->index = 0; /* for now, are there chips with more than one
+ * rgmii ? if yes, then we'll add a cell_index
+ * like we do for emac
+ */
+ memcpy_fromio(regs, dev->base, sizeof(struct rgmii_regs));
+ return regs + 1;
+}
+
+
+static int __devinit rgmii_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ struct device_node *np = ofdev->node;
+ struct rgmii_instance *dev;
+ struct resource regs;
+ int rc;
+
+ rc = -ENOMEM;
+ dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
+ if (dev == NULL) {
+ printk(KERN_ERR "%s: could not allocate RGMII device!\n",
+ np->full_name);
+ goto err_gone;
+ }
+
+ mutex_init(&dev->lock);
+ dev->ofdev = ofdev;
+
+ rc = -ENXIO;
+ if (of_address_to_resource(np, 0, &regs)) {
+ printk(KERN_ERR "%s: Can't get registers address\n",
+ np->full_name);
+ goto err_free;
+ }
+
+ rc = -ENOMEM;
+ dev->base = (struct rgmii_regs *)ioremap(regs.start,
+ sizeof(struct rgmii_regs));
+ if (dev->base == NULL) {
+ printk(KERN_ERR "%s: Can't map device registers!\n",
+ np->full_name);
+ goto err_free;
+ }
+
+ /* Check for RGMII type */
+ if (device_is_compatible(ofdev->node, "ibm,rgmii-axon"))
+ dev->type = RGMII_AXON;
+ else
+ dev->type = RGMII_STANDARD;
+
+ DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
+ in_be32(&dev->base->fer), in_be32(&dev->base->ssr));
+
+ /* Disable all inputs by default */
+ out_be32(&dev->base->fer, 0);
+
+ printk(KERN_INFO
+ "RGMII %s %s initialized\n",
+ dev->type == RGMII_STANDARD ? "standard" : "axon",
+ ofdev->node->full_name);
+
+ wmb();
+ dev_set_drvdata(&ofdev->dev, dev);
+
+ return 0;
+
+ err_free:
+ kfree(dev);
+ err_gone:
+ return rc;
+}
+
+static int __devexit rgmii_remove(struct of_device *ofdev)
+{
+ struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+
+ dev_set_drvdata(&ofdev->dev, NULL);
+
+ WARN_ON(dev->users != 0);
+
+ iounmap(dev->base);
+ kfree(dev);
+
+ return 0;
+}
+
+static struct of_device_id rgmii_match[] =
+{
+ {
+ .type = "rgmii-interface",
+ .compatible = "ibm,rgmii",
+ },
+ {
+ .type = "emac-rgmii",
+ },
+ {},
+};
+
+static struct of_platform_driver rgmii_driver = {
+ .name = "emac-rgmii",
+ .match_table = rgmii_match,
+
+ .probe = rgmii_probe,
+ .remove = rgmii_remove,
+};
+
+int __init rgmii_init(void)
+{
+ return of_register_platform_driver(&rgmii_driver);
+}
+
+void rgmii_exit(void)
+{
+ of_unregister_platform_driver(&rgmii_driver);
+}
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