254 lines
6.4 KiB
C
254 lines
6.4 KiB
C
/*
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* drivers/net/ibm_emac/ibm_emac_zmii.c
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*
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* Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
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*
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* Copyright (c) 2004, 2005 Zultys Technologies.
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* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
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*
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* Based on original work by
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* Armin Kuster <akuster@mvista.com>
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* Copyright 2001 MontaVista Softare Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/ethtool.h>
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#include <asm/io.h>
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#include "ibm_emac_core.h"
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#include "ibm_emac_debug.h"
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/* ZMIIx_FER */
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#define ZMII_FER_MDI(idx) (0x80000000 >> ((idx) * 4))
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#define ZMII_FER_MDI_ALL (ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
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ZMII_FER_MDI(2) | ZMII_FER_MDI(3))
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#define ZMII_FER_SMII(idx) (0x40000000 >> ((idx) * 4))
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#define ZMII_FER_RMII(idx) (0x20000000 >> ((idx) * 4))
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#define ZMII_FER_MII(idx) (0x10000000 >> ((idx) * 4))
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/* ZMIIx_SSR */
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#define ZMII_SSR_SCI(idx) (0x40000000 >> ((idx) * 4))
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#define ZMII_SSR_FSS(idx) (0x20000000 >> ((idx) * 4))
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#define ZMII_SSR_SP(idx) (0x10000000 >> ((idx) * 4))
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/* ZMII only supports MII, RMII and SMII
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* we also support autodetection for backward compatibility
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*/
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static inline int zmii_valid_mode(int mode)
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{
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return mode == PHY_MODE_MII ||
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mode == PHY_MODE_RMII ||
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mode == PHY_MODE_SMII ||
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mode == PHY_MODE_NA;
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}
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static inline const char *zmii_mode_name(int mode)
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{
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switch (mode) {
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case PHY_MODE_MII:
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return "MII";
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case PHY_MODE_RMII:
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return "RMII";
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case PHY_MODE_SMII:
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return "SMII";
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default:
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BUG();
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}
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}
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static inline u32 zmii_mode_mask(int mode, int input)
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{
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switch (mode) {
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case PHY_MODE_MII:
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return ZMII_FER_MII(input);
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case PHY_MODE_RMII:
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return ZMII_FER_RMII(input);
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case PHY_MODE_SMII:
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return ZMII_FER_SMII(input);
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default:
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return 0;
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}
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}
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static int __init zmii_init(struct ocp_device *ocpdev, int input, int *mode)
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{
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struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
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struct zmii_regs __iomem *p;
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ZMII_DBG("%d: init(%d, %d)" NL, ocpdev->def->index, input, *mode);
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if (!dev) {
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dev = kzalloc(sizeof(struct ibm_ocp_zmii), GFP_KERNEL);
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if (!dev) {
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printk(KERN_ERR
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"zmii%d: couldn't allocate device structure!\n",
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ocpdev->def->index);
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return -ENOMEM;
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}
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dev->mode = PHY_MODE_NA;
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p = ioremap(ocpdev->def->paddr, sizeof(struct zmii_regs));
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if (!p) {
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printk(KERN_ERR
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"zmii%d: could not ioremap device registers!\n",
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ocpdev->def->index);
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kfree(dev);
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return -ENOMEM;
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}
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dev->base = p;
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ocp_set_drvdata(ocpdev, dev);
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/* We may need FER value for autodetection later */
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dev->fer_save = in_be32(&p->fer);
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/* Disable all inputs by default */
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out_be32(&p->fer, 0);
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} else
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p = dev->base;
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if (!zmii_valid_mode(*mode)) {
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/* Probably an EMAC connected to RGMII,
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* but it still may need ZMII for MDIO
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*/
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goto out;
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}
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/* Autodetect ZMII mode if not specified.
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* This is only for backward compatibility with the old driver.
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* Please, always specify PHY mode in your board port to avoid
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* any surprises.
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*/
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if (dev->mode == PHY_MODE_NA) {
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if (*mode == PHY_MODE_NA) {
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u32 r = dev->fer_save;
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ZMII_DBG("%d: autodetecting mode, FER = 0x%08x" NL,
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ocpdev->def->index, r);
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if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
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dev->mode = PHY_MODE_MII;
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else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
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dev->mode = PHY_MODE_RMII;
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else
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dev->mode = PHY_MODE_SMII;
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} else
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dev->mode = *mode;
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printk(KERN_NOTICE "zmii%d: bridge in %s mode\n",
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ocpdev->def->index, zmii_mode_name(dev->mode));
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} else {
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/* All inputs must use the same mode */
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if (*mode != PHY_MODE_NA && *mode != dev->mode) {
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printk(KERN_ERR
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"zmii%d: invalid mode %d specified for input %d\n",
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ocpdev->def->index, *mode, input);
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return -EINVAL;
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}
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}
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/* Report back correct PHY mode,
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* it may be used during PHY initialization.
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*/
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*mode = dev->mode;
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/* Enable this input */
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out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
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out:
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++dev->users;
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return 0;
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}
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int __init zmii_attach(void *emac)
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{
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struct ocp_enet_private *dev = emac;
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struct ocp_func_emac_data *emacdata = dev->def->additions;
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if (emacdata->zmii_idx >= 0) {
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dev->zmii_input = emacdata->zmii_mux;
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dev->zmii_dev =
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ocp_find_device(OCP_VENDOR_IBM, OCP_FUNC_ZMII,
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emacdata->zmii_idx);
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if (!dev->zmii_dev) {
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printk(KERN_ERR "emac%d: unknown zmii%d!\n",
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dev->def->index, emacdata->zmii_idx);
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return -ENODEV;
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}
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if (zmii_init
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(dev->zmii_dev, dev->zmii_input, &emacdata->phy_mode)) {
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printk(KERN_ERR
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"emac%d: zmii%d initialization failed!\n",
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dev->def->index, emacdata->zmii_idx);
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return -ENODEV;
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}
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}
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return 0;
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}
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void __zmii_enable_mdio(struct ocp_device *ocpdev, int input)
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{
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struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
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u32 fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
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ZMII_DBG2("%d: mdio(%d)" NL, ocpdev->def->index, input);
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out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
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}
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void __zmii_set_speed(struct ocp_device *ocpdev, int input, int speed)
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{
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struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
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u32 ssr = in_be32(&dev->base->ssr);
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ZMII_DBG("%d: speed(%d, %d)" NL, ocpdev->def->index, input, speed);
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if (speed == SPEED_100)
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ssr |= ZMII_SSR_SP(input);
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else
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ssr &= ~ZMII_SSR_SP(input);
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out_be32(&dev->base->ssr, ssr);
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}
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void __exit __zmii_fini(struct ocp_device *ocpdev, int input)
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{
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struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
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BUG_ON(!dev || dev->users == 0);
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ZMII_DBG("%d: fini(%d)" NL, ocpdev->def->index, input);
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/* Disable this input */
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out_be32(&dev->base->fer,
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in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));
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if (!--dev->users) {
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/* Free everything if this is the last user */
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ocp_set_drvdata(ocpdev, NULL);
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iounmap(dev->base);
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kfree(dev);
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}
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}
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int __zmii_get_regs_len(struct ocp_device *ocpdev)
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{
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return sizeof(struct emac_ethtool_regs_subhdr) +
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sizeof(struct zmii_regs);
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}
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void *zmii_dump_regs(struct ocp_device *ocpdev, void *buf)
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{
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struct ibm_ocp_zmii *dev = ocp_get_drvdata(ocpdev);
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struct emac_ethtool_regs_subhdr *hdr = buf;
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struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);
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hdr->version = 0;
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hdr->index = ocpdev->def->index;
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memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
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return regs + 1;
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}
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