1 files changed, 332 insertions, 0 deletions

diff --git a/drivers/net/ibm_newemac/zmii.c b/drivers/net/ibm_newemac/zmii.c
new file mode 100644
index 00000000000..97449e786d6
--- /dev/null
+++ b/drivers/net/ibm_newemac/zmii.c
@@ -0,0 +1,332 @@
+/*
+ * drivers/net/ibm_newemac/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 <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 __devinit zmii_attach(struct platform_device *ofdev, int input, int *mode)
+{
+        struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
+        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 = dev_get_drvdata(&ofdev->dev);
+        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 = dev_get_drvdata(&ofdev->dev);
+
+        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 = dev_get_drvdata(&ofdev->dev);
+        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 = dev_get_drvdata(&ofdev->dev);
+
+        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 = dev_get_drvdata(&ofdev->dev);
+        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 __devinit 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) {
+                printk(KERN_ERR "%s: could not allocate ZMII device!\n",
+                       np->full_name);
+                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();
+        dev_set_drvdata(&ofdev->dev, dev);
+
+        return 0;
+
+ err_free:
+        kfree(dev);
+ err_gone:
+        return rc;
+}
+
+static int __devexit zmii_remove(struct platform_device *ofdev)
+{
+        struct zmii_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 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);
+}