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linux/drivers/net/fec_8xx/fec_mii.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

380 lines
9.2 KiB
C
Raw Blame History

/*
* Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
*
* Copyright (c) 2003 Intracom S.A.
* by Pantelis Antoniou <panto@intracom.gr>
*
* Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
* and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
*
* Released under the GPL
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <asm/8xx_immap.h>
#include <asm/pgtable.h>
#include <asm/mpc8xx.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/commproc.h>
/*************************************************/
#include "fec_8xx.h"
/*************************************************/
/* Make MII read/write commands for the FEC.
*/
#define mk_mii_read(REG) (0x60020000 | ((REG & 0x1f) << 18))
#define mk_mii_write(REG, VAL) (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
#define mk_mii_end 0
/*************************************************/
/* XXX both FECs use the MII interface of FEC1 */
static DEFINE_SPINLOCK(fec_mii_lock);
#define FEC_MII_LOOPS 10000
int fec_mii_read(struct net_device *dev, int phy_id, int location)
{
struct fec_enet_private *fep = netdev_priv(dev);
fec_t *fecp;
int i, ret = -1;
unsigned long flags;
/* XXX MII interface is only connected to FEC1 */
fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
spin_lock_irqsave(&fec_mii_lock, flags);
if ((FR(fecp, r_cntrl) & FEC_RCNTRL_MII_MODE) == 0) {
FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
FW(fecp, ievent, FEC_ENET_MII);
}
/* Add PHY address to register command. */
FW(fecp, mii_speed, fep->fec_phy_speed);
FW(fecp, mii_data, (phy_id << 23) | mk_mii_read(location));
for (i = 0; i < FEC_MII_LOOPS; i++)
if ((FR(fecp, ievent) & FEC_ENET_MII) != 0)
break;
if (i < FEC_MII_LOOPS) {
FW(fecp, ievent, FEC_ENET_MII);
ret = FR(fecp, mii_data) & 0xffff;
}
spin_unlock_irqrestore(&fec_mii_lock, flags);
return ret;
}
void fec_mii_write(struct net_device *dev, int phy_id, int location, int value)
{
struct fec_enet_private *fep = netdev_priv(dev);
fec_t *fecp;
unsigned long flags;
int i;
/* XXX MII interface is only connected to FEC1 */
fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
spin_lock_irqsave(&fec_mii_lock, flags);
if ((FR(fecp, r_cntrl) & FEC_RCNTRL_MII_MODE) == 0) {
FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
FW(fecp, ievent, FEC_ENET_MII);
}
/* Add PHY address to register command. */
FW(fecp, mii_speed, fep->fec_phy_speed); /* always adapt mii speed */
FW(fecp, mii_data, (phy_id << 23) | mk_mii_write(location, value));
for (i = 0; i < FEC_MII_LOOPS; i++)
if ((FR(fecp, ievent) & FEC_ENET_MII) != 0)
break;
if (i < FEC_MII_LOOPS)
FW(fecp, ievent, FEC_ENET_MII);
spin_unlock_irqrestore(&fec_mii_lock, flags);
}
/*************************************************/
#ifdef CONFIG_FEC_8XX_GENERIC_PHY
/*
* Generic PHY support.
* Should work for all PHYs, but link change is detected by polling
*/
static void generic_timer_callback(unsigned long data)
{
struct net_device *dev = (struct net_device *)data;
struct fec_enet_private *fep = netdev_priv(dev);
fep->phy_timer_list.expires = jiffies + HZ / 2;
add_timer(&fep->phy_timer_list);
fec_mii_link_status_change_check(dev, 0);
}
static void generic_startup(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
fep->phy_timer_list.expires = jiffies + HZ / 2; /* every 500ms */
fep->phy_timer_list.data = (unsigned long)dev;
fep->phy_timer_list.function = generic_timer_callback;
add_timer(&fep->phy_timer_list);
}
static void generic_shutdown(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
del_timer_sync(&fep->phy_timer_list);
}
#endif
#ifdef CONFIG_FEC_8XX_DM9161_PHY
/* ------------------------------------------------------------------------- */
/* The Davicom DM9161 is used on the NETTA board */
/* register definitions */
#define MII_DM9161_ACR 16 /* Aux. Config Register */
#define MII_DM9161_ACSR 17 /* Aux. Config/Status Register */
#define MII_DM9161_10TCSR 18 /* 10BaseT Config/Status Reg. */
#define MII_DM9161_INTR 21 /* Interrupt Register */
#define MII_DM9161_RECR 22 /* Receive Error Counter Reg. */
#define MII_DM9161_DISCR 23 /* Disconnect Counter Register */
static void dm9161_startup(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
fec_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0000);
}
static void dm9161_ack_int(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
fec_mii_read(dev, fep->mii_if.phy_id, MII_DM9161_INTR);
}
static void dm9161_shutdown(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
fec_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0f00);
}
#endif
/**********************************************************************************/
static const struct phy_info phy_info[] = {
#ifdef CONFIG_FEC_8XX_DM9161_PHY
{
.id = 0x00181b88,
.name = "DM9161",
.startup = dm9161_startup,
.ack_int = dm9161_ack_int,
.shutdown = dm9161_shutdown,
},
#endif
#ifdef CONFIG_FEC_8XX_GENERIC_PHY
{
.id = 0,
.name = "GENERIC",
.startup = generic_startup,
.shutdown = generic_shutdown,
},
#endif
};
/**********************************************************************************/
int fec_mii_phy_id_detect(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
const struct fec_platform_info *fpi = fep->fpi;
int i, r, start, end, phytype, physubtype;
const struct phy_info *phy;
int phy_hwid, phy_id;
/* if no MDIO */
if (fpi->use_mdio == 0)
return -1;
phy_hwid = -1;
fep->phy = NULL;
/* auto-detect? */
if (fpi->phy_addr == -1) {
start = 0;
end = 32;
} else { /* direct */
start = fpi->phy_addr;
end = start + 1;
}
for (phy_id = start; phy_id < end; phy_id++) {
r = fec_mii_read(dev, phy_id, MII_PHYSID1);
if (r == -1 || (phytype = (r & 0xffff)) == 0xffff)
continue;
r = fec_mii_read(dev, phy_id, MII_PHYSID2);
if (r == -1 || (physubtype = (r & 0xffff)) == 0xffff)
continue;
phy_hwid = (phytype << 16) | physubtype;
if (phy_hwid != -1)
break;
}
if (phy_hwid == -1) {
printk(KERN_ERR DRV_MODULE_NAME
": %s No PHY detected!\n", dev->name);
return -1;
}
for (i = 0, phy = phy_info; i < sizeof(phy_info) / sizeof(phy_info[0]);
i++, phy++)
if (phy->id == (phy_hwid >> 4) || phy->id == 0)
break;
if (i >= sizeof(phy_info) / sizeof(phy_info[0])) {
printk(KERN_ERR DRV_MODULE_NAME
": %s PHY id 0x%08x is not supported!\n",
dev->name, phy_hwid);
return -1;
}
fep->phy = phy;
printk(KERN_INFO DRV_MODULE_NAME
": %s Phy @ 0x%x, type %s (0x%08x)\n",
dev->name, phy_id, fep->phy->name, phy_hwid);
return phy_id;
}
void fec_mii_startup(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
const struct fec_platform_info *fpi = fep->fpi;
if (!fpi->use_mdio || fep->phy == NULL)
return;
if (fep->phy->startup == NULL)
return;
(*fep->phy->startup) (dev);
}
void fec_mii_shutdown(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
const struct fec_platform_info *fpi = fep->fpi;
if (!fpi->use_mdio || fep->phy == NULL)
return;
if (fep->phy->shutdown == NULL)
return;
(*fep->phy->shutdown) (dev);
}
void fec_mii_ack_int(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
const struct fec_platform_info *fpi = fep->fpi;
if (!fpi->use_mdio || fep->phy == NULL)
return;
if (fep->phy->ack_int == NULL)
return;
(*fep->phy->ack_int) (dev);
}
/* helper function */
static int mii_negotiated(struct mii_if_info *mii)
{
int advert, lpa, val;
if (!mii_link_ok(mii))
return 0;
val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
if ((val & BMSR_ANEGCOMPLETE) == 0)
return 0;
advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
return mii_nway_result(advert & lpa);
}
void fec_mii_link_status_change_check(struct net_device *dev, int init_media)
{
struct fec_enet_private *fep = netdev_priv(dev);
unsigned int media;
unsigned long flags;
if (mii_check_media(&fep->mii_if, netif_msg_link(fep), init_media) == 0)
return;
media = mii_negotiated(&fep->mii_if);
if (netif_carrier_ok(dev)) {
spin_lock_irqsave(&fep->lock, flags);
fec_restart(dev, !!(media & ADVERTISE_FULL),
(media & (ADVERTISE_100FULL | ADVERTISE_100HALF)) ?
100 : 10);
spin_unlock_irqrestore(&fep->lock, flags);
netif_start_queue(dev);
} else {
netif_stop_queue(dev);
spin_lock_irqsave(&fep->lock, flags);
fec_stop(dev);
spin_unlock_irqrestore(&fep->lock, flags);
}
}
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