Device tree aware EMAC driver
Based on BenH's earlier work, this is a new version of the EMAC driver for the built-in ethernet found on PowerPC 4xx embedded CPUs. The same ASIC is also found in the Axon bridge chip. This new version is designed to work in the arch/powerpc tree, using the device tree to probe the device, rather than the old and ugly arch/ppc OCP layer. This driver is designed to sit alongside the old driver (that lies in drivers/net/ibm_emac and this one in drivers/net/ibm_newemac). The old driver is left in place to support arch/ppc until arch/ppc itself reaches its final demise (not too long now, with luck). This driver still has a number of things that could do with cleaning up, but I think they can be fixed up after merging. Specifically: - Should be adjusted to properly use the dma mapping API. Axon needs this. - Probe logic needs reworking, in conjuction with the general probing code for of_platform devices. The dependencies here between EMAC, MAL, ZMII etc. make this complicated. At present, it usually works, because we initialize and register the sub-drivers before the EMAC driver itself, and (being in driver code) runs after the devices themselves have been instantiated from the device tree. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
David Gibson
committed by
David S. Miller
David S. Miller
parent
03233b90b0
commit
1d3bb99648
322
drivers/net/ibm_newemac/zmii.c
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322
drivers/net/ibm_newemac/zmii.c
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/*
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* drivers/net/ibm_newemac/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 "emac.h"
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#include "core.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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int __devinit zmii_attach(struct of_device *ofdev, int input, int *mode)
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{
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struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
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struct zmii_regs *p = dev->base;
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ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);
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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 so
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* we don't fail here.
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*/
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return 0;
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mutex_lock(&dev->lock);
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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(dev, "autodetecting mode, FER = 0x%08x" NL, 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 "%s: bridge in %s mode\n",
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ofdev->node->full_name, 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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"%s: invalid mode %d specified for input %d\n",
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ofdev->node->full_name, *mode, input);
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mutex_unlock(&dev->lock);
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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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++dev->users;
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mutex_unlock(&dev->lock);
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return 0;
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}
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void zmii_get_mdio(struct of_device *ofdev, int input)
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{
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struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
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u32 fer;
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ZMII_DBG2(dev, "get_mdio(%d)" NL, input);
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mutex_lock(&dev->lock);
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fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
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out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
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}
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void zmii_put_mdio(struct of_device *ofdev, int input)
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{
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struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
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ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
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mutex_unlock(&dev->lock);
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}
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void zmii_set_speed(struct of_device *ofdev, int input, int speed)
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{
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struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
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u32 ssr;
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mutex_lock(&dev->lock);
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ssr = in_be32(&dev->base->ssr);
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ZMII_DBG(dev, "speed(%d, %d)" NL, 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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mutex_unlock(&dev->lock);
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}
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void __devexit zmii_detach(struct of_device *ofdev, int input)
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{
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struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
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BUG_ON(!dev || dev->users == 0);
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mutex_lock(&dev->lock);
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ZMII_DBG(dev, "detach(%d)" NL, 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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--dev->users;
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mutex_unlock(&dev->lock);
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}
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int zmii_get_regs_len(struct of_device *ofdev)
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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 of_device *ofdev, void *buf)
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{
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struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
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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 = 0; /* for now, are there chips with more than one
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* zmii ? if yes, then we'll add a cell_index
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* like we do for emac
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*/
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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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static int __devinit zmii_probe(struct of_device *ofdev,
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const struct of_device_id *match)
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{
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struct device_node *np = ofdev->node;
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struct zmii_instance *dev;
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struct resource regs;
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int rc;
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rc = -ENOMEM;
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dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
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if (dev == NULL) {
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printk(KERN_ERR "%s: could not allocate ZMII device!\n",
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np->full_name);
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goto err_gone;
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}
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mutex_init(&dev->lock);
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dev->ofdev = ofdev;
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dev->mode = PHY_MODE_NA;
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rc = -ENXIO;
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if (of_address_to_resource(np, 0, ®s)) {
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printk(KERN_ERR "%s: Can't get registers address\n",
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np->full_name);
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goto err_free;
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}
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rc = -ENOMEM;
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dev->base = (struct zmii_regs *)ioremap(regs.start,
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sizeof(struct zmii_regs));
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if (dev->base == NULL) {
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printk(KERN_ERR "%s: Can't map device registers!\n",
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np->full_name);
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goto err_free;
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}
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/* We may need FER value for autodetection later */
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dev->fer_save = in_be32(&dev->base->fer);
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/* Disable all inputs by default */
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out_be32(&dev->base->fer, 0);
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printk(KERN_INFO
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"ZMII %s initialized\n", ofdev->node->full_name);
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wmb();
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dev_set_drvdata(&ofdev->dev, dev);
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return 0;
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err_free:
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kfree(dev);
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err_gone:
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return rc;
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}
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static int __devexit zmii_remove(struct of_device *ofdev)
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{
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struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
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dev_set_drvdata(&ofdev->dev, NULL);
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WARN_ON(dev->users != 0);
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iounmap(dev->base);
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kfree(dev);
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return 0;
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}
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static struct of_device_id zmii_match[] =
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{
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{
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.compatible = "ibm,zmii",
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},
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/* For backward compat with old DT */
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{
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.type = "emac-zmii",
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},
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{},
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};
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static struct of_platform_driver zmii_driver = {
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.name = "emac-zmii",
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.match_table = zmii_match,
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.probe = zmii_probe,
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.remove = zmii_remove,
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};
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int __init zmii_init(void)
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{
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return of_register_platform_driver(&zmii_driver);
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}
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void zmii_exit(void)
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{
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of_unregister_platform_driver(&zmii_driver);
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}
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