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path: root/drivers/net/ethernet/ibm/emac/zmii.c
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Diffstat (limited to 'drivers/net/ethernet/ibm/emac/zmii.c')
-rw-r--r--drivers/net/ethernet/ibm/emac/zmii.c328
1 files changed, 328 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ibm/emac/zmii.c b/drivers/net/ethernet/ibm/emac/zmii.c
new file mode 100644
index 00000000000..9ca67a38c06
--- /dev/null
+++ b/drivers/net/ethernet/ibm/emac/zmii.c
@@ -0,0 +1,328 @@
+/*
+ * drivers/net/ethernet/ibm/emac/zmii.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
+ *
+ * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Based on the arch/ppc version of the driver:
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies.
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * Based on original work by
+ * Armin Kuster <akuster@mvista.com>
+ * Copyright 2001 MontaVista Softare 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/slab.h>
+#include <linux/kernel.h>
+#include <linux/ethtool.h>
+#include <linux/of_address.h>
+#include <asm/io.h>
+
+#include "emac.h"
+#include "core.h"
+
+/* ZMIIx_FER */
+#define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
+#define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
+ ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
+
+#define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
+#define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
+#define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
+
+/* ZMIIx_SSR */
+#define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
+#define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
+#define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
+
+/* ZMII only supports MII, RMII and SMII
+ * we also support autodetection for backward compatibility
+ */
+static inline int zmii_valid_mode(int mode)
+{
+ return mode == PHY_MODE_MII ||
+ mode == PHY_MODE_RMII ||
+ mode == PHY_MODE_SMII ||
+ mode == PHY_MODE_NA;
+}
+
+static inline const char *zmii_mode_name(int mode)
+{
+ switch (mode) {
+ case PHY_MODE_MII:
+ return "MII";
+ case PHY_MODE_RMII:
+ return "RMII";
+ case PHY_MODE_SMII:
+ return "SMII";
+ default:
+ BUG();
+ }
+}
+
+static inline u32 zmii_mode_mask(int mode, int input)
+{
+ switch (mode) {
+ case PHY_MODE_MII:
+ return ZMII_FER_MII(input);
+ case PHY_MODE_RMII:
+ return ZMII_FER_RMII(input);
+ case PHY_MODE_SMII:
+ return ZMII_FER_SMII(input);
+ default:
+ return 0;
+ }
+}
+
+int zmii_attach(struct platform_device *ofdev, int input, int *mode)
+{
+ struct zmii_instance *dev = platform_get_drvdata(ofdev);
+ struct zmii_regs __iomem *p = dev->base;
+
+ ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
+
+ if (!zmii_valid_mode(*mode)) {
+ /* Probably an EMAC connected to RGMII,
+ * but it still may need ZMII for MDIO so
+ * we don't fail here.
+ */
+ dev->users++;
+ return 0;
+ }
+
+ mutex_lock(&dev->lock);
+
+ /* Autodetect ZMII mode if not specified.
+ * This is only for backward compatibility with the old driver.
+ * Please, always specify PHY mode in your board port to avoid
+ * any surprises.
+ */
+ if (dev->mode == PHY_MODE_NA) {
+ if (*mode == PHY_MODE_NA) {
+ u32 r = dev->fer_save;
+
+ ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);
+
+ if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
+ dev->mode = PHY_MODE_MII;
+ else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
+ dev->mode = PHY_MODE_RMII;
+ else
+ dev->mode = PHY_MODE_SMII;
+ } else
+ dev->mode = *mode;
+
+ printk(KERN_NOTICE "%s: bridge in %s mode\n",
+ ofdev->dev.of_node->full_name,
+ zmii_mode_name(dev->mode));
+ } else {
+ /* All inputs must use the same mode */
+ if (*mode != PHY_MODE_NA && *mode != dev->mode) {
+ printk(KERN_ERR
+ "%s: invalid mode %d specified for input %d\n",
+ ofdev->dev.of_node->full_name, *mode, input);
+ mutex_unlock(&dev->lock);
+ return -EINVAL;
+ }
+ }
+
+ /* Report back correct PHY mode,
+ * it may be used during PHY initialization.
+ */
+ *mode = dev->mode;
+
+ /* Enable this input */
+ out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
+ ++dev->users;
+
+ mutex_unlock(&dev->lock);
+
+ return 0;
+}
+
+void zmii_get_mdio(struct platform_device *ofdev, int input)
+{
+ struct zmii_instance *dev = platform_get_drvdata(ofdev);
+ u32 fer;
+
+ ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
+
+ mutex_lock(&dev->lock);
+
+ fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
+ out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
+}
+
+void zmii_put_mdio(struct platform_device *ofdev, int input)
+{
+ struct zmii_instance *dev = platform_get_drvdata(ofdev);
+
+ ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
+ mutex_unlock(&dev->lock);
+}
+
+
+void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
+{
+ struct zmii_instance *dev = platform_get_drvdata(ofdev);
+ u32 ssr;
+
+ mutex_lock(&dev->lock);
+
+ ssr = in_be32(&dev->base->ssr);
+
+ ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);
+
+ if (speed == SPEED_100)
+ ssr |= ZMII_SSR_SP(input);
+ else
+ ssr &= ~ZMII_SSR_SP(input);
+
+ out_be32(&dev->base->ssr, ssr);
+
+ mutex_unlock(&dev->lock);
+}
+
+void zmii_detach(struct platform_device *ofdev, int input)
+{
+ struct zmii_instance *dev = platform_get_drvdata(ofdev);
+
+ BUG_ON(!dev || dev->users == 0);
+
+ mutex_lock(&dev->lock);
+
+ ZMII_DBG(dev, "detach(%d)" NL, input);
+
+ /* Disable this input */
+ out_be32(&dev->base->fer,
+ in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
+
+ --dev->users;
+
+ mutex_unlock(&dev->lock);
+}
+
+int zmii_get_regs_len(struct platform_device *ofdev)
+{
+ return sizeof(struct emac_ethtool_regs_subhdr) +
+ sizeof(struct zmii_regs);
+}
+
+void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
+{
+ struct zmii_instance *dev = platform_get_drvdata(ofdev);
+ struct emac_ethtool_regs_subhdr *hdr = buf;
+ struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
+
+ hdr->version = 0;
+ hdr->index = 0; /* for now, are there chips with more than one
+ * zmii ? if yes, then we'll add a cell_index
+ * like we do for emac
+ */
+ memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
+ return regs + 1;
+}
+
+static int zmii_probe(struct platform_device *ofdev)
+{
+ struct device_node *np = ofdev->dev.of_node;
+ struct zmii_instance *dev;
+ struct resource regs;
+ int rc;
+
+ rc = -ENOMEM;
+ dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
+ if (dev == NULL)
+ goto err_gone;
+
+ mutex_init(&dev->lock);
+ dev->ofdev = ofdev;
+ dev->mode = PHY_MODE_NA;
+
+ 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 zmii_regs __iomem *)ioremap(regs.start,
+ sizeof(struct zmii_regs));
+ if (dev->base == NULL) {
+ printk(KERN_ERR "%s: Can't map device registers!\n",
+ np->full_name);
+ goto err_free;
+ }
+
+ /* We may need FER value for autodetection later */
+ dev->fer_save = in_be32(&dev->base->fer);
+
+ /* Disable all inputs by default */
+ out_be32(&dev->base->fer, 0);
+
+ printk(KERN_INFO
+ "ZMII %s initialized\n", ofdev->dev.of_node->full_name);
+ wmb();
+ platform_set_drvdata(ofdev, dev);
+
+ return 0;
+
+ err_free:
+ kfree(dev);
+ err_gone:
+ return rc;
+}
+
+static int zmii_remove(struct platform_device *ofdev)
+{
+ struct zmii_instance *dev = platform_get_drvdata(ofdev);
+
+ WARN_ON(dev->users != 0);
+
+ iounmap(dev->base);
+ kfree(dev);
+
+ return 0;
+}
+
+static struct of_device_id zmii_match[] =
+{
+ {
+ .compatible = "ibm,zmii",
+ },
+ /* For backward compat with old DT */
+ {
+ .type = "emac-zmii",
+ },
+ {},
+};
+
+static struct platform_driver zmii_driver = {
+ .driver = {
+ .name = "emac-zmii",
+ .owner = THIS_MODULE,
+ .of_match_table = zmii_match,
+ },
+ .probe = zmii_probe,
+ .remove = zmii_remove,
+};
+
+int __init zmii_init(void)
+{
+ return platform_driver_register(&zmii_driver);
+}
+
+void zmii_exit(void)
+{
+ platform_driver_unregister(&zmii_driver);
+}
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