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/*
* Network device driver for the GMAC ethernet controller on
* Apple G4 Powermacs.
*
* Copyright (C) 2000 Paul Mackerras & Ben. Herrenschmidt
*
* portions based on sunhme.c by David S. Miller
*
* Changes:
* Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 08/06/2000
* - check init_etherdev return in gmac_probe1
* BenH <benh@kernel.crashing.org> - 03/09/2000
* - Add support for new PHYs
* - Add some PowerBook sleep code
* BenH <benh@kernel.crashing.org> - ??/??/????
* - PHY updates
* BenH <benh@kernel.crashing.org> - 08/08/2001
* - Add more PHYs, fixes to sleep code
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/keylargo.h>
#include <asm/pci-bridge.h>
#ifdef CONFIG_PMAC_PBOOK
#include <linux/adb.h>
#include <linux/pmu.h>
#include <asm/irq.h>
#endif
#include "gmac.h"
#define DEBUG_PHY
/* Driver version 1.5, kernel 2.4.x */
#define GMAC_VERSION "v1.5k4"
#define DUMMY_BUF_LEN RX_BUF_ALLOC_SIZE + RX_OFFSET + GMAC_BUFFER_ALIGN
static unsigned char *dummy_buf;
static struct net_device *gmacs;
/* Prototypes */
static int mii_read(struct gmac *gm, int phy, int r);
static int mii_write(struct gmac *gm, int phy, int r, int v);
static void mii_poll_start(struct gmac *gm);
static void mii_poll_stop(struct gmac *gm);
static void mii_interrupt(struct gmac *gm);
static int mii_lookup_and_reset(struct gmac *gm);
static void mii_setup_phy(struct gmac *gm);
static int mii_do_reset_phy(struct gmac *gm, int phy_addr);
static void mii_init_BCM5400(struct gmac *gm);
static void mii_init_BCM5401(struct gmac *gm);
static void gmac_set_power(struct gmac *gm, int power_up);
static int gmac_powerup_and_reset(struct net_device *dev);
static void gmac_set_gigabit_mode(struct gmac *gm, int gigabit);
static void gmac_set_duplex_mode(struct gmac *gm, int full_duplex);
static void gmac_mac_init(struct gmac *gm, unsigned char *mac_addr);
static void gmac_init_rings(struct gmac *gm, int from_irq);
static void gmac_start_dma(struct gmac *gm);
static void gmac_stop_dma(struct gmac *gm);
static void gmac_set_multicast(struct net_device *dev);
static int gmac_open(struct net_device *dev);
static int gmac_close(struct net_device *dev);
static void gmac_tx_timeout(struct net_device *dev);
static int gmac_xmit_start(struct sk_buff *skb, struct net_device *dev);
static void gmac_tx_cleanup(struct net_device *dev, int force_cleanup);
static void gmac_receive(struct net_device *dev);
static void gmac_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static struct net_device_stats *gmac_stats(struct net_device *dev);
static int gmac_probe(void);
static void gmac_probe1(struct device_node *gmac);
#ifdef CONFIG_PMAC_PBOOK
int gmac_sleep_notify(struct pmu_sleep_notifier *self, int when);
static struct pmu_sleep_notifier gmac_sleep_notifier = {
gmac_sleep_notify, SLEEP_LEVEL_NET,
};
#endif
/*
* Read via the mii interface from a PHY register
*/
static int
mii_read(struct gmac *gm, int phy, int r)
{
int timeout;
GM_OUT(GM_MIF_FRAME_CTL_DATA,
(0x01 << GM_MIF_FRAME_START_SHIFT) |
(0x02 << GM_MIF_FRAME_OPCODE_SHIFT) |
GM_MIF_FRAME_TURNAROUND_HI |
(phy << GM_MIF_FRAME_PHY_ADDR_SHIFT) |
(r << GM_MIF_FRAME_REG_ADDR_SHIFT));
for (timeout = 1000; timeout > 0; --timeout) {
udelay(20);
if (GM_IN(GM_MIF_FRAME_CTL_DATA) & GM_MIF_FRAME_TURNAROUND_LO)
return GM_IN(GM_MIF_FRAME_CTL_DATA) & GM_MIF_FRAME_DATA_MASK;
}
return -1;
}
/*
* Write on the mii interface to a PHY register
*/
static int
mii_write(struct gmac *gm, int phy, int r, int v)
{
int timeout;
GM_OUT(GM_MIF_FRAME_CTL_DATA,
(0x01 << GM_MIF_FRAME_START_SHIFT) |
(0x01 << GM_MIF_FRAME_OPCODE_SHIFT) |
GM_MIF_FRAME_TURNAROUND_HI |
(phy << GM_MIF_FRAME_PHY_ADDR_SHIFT) |
(r << GM_MIF_FRAME_REG_ADDR_SHIFT) |
(v & GM_MIF_FRAME_DATA_MASK));
for (timeout = 1000; timeout > 0; --timeout) {
udelay(20);
if (GM_IN(GM_MIF_FRAME_CTL_DATA) & GM_MIF_FRAME_TURNAROUND_LO)
return 0;
}
return -1;
}
/*
* Start MIF autopolling of the PHY status register
*/
static void
mii_poll_start(struct gmac *gm)
{
unsigned int tmp;
/* Start the MIF polling on the external transceiver. */
tmp = GM_IN(GM_MIF_CFG);
tmp &= ~(GM_MIF_CFGPR_MASK | GM_MIF_CFGPD_MASK);
tmp |= ((gm->phy_addr & 0x1f) << GM_MIF_CFGPD_SHIFT);
tmp |= (MII_SR << GM_MIF_CFGPR_SHIFT);
tmp |= GM_MIF_CFGPE;
GM_OUT(GM_MIF_CFG, tmp);
/* Let the bits set. */
udelay(GM_MIF_POLL_DELAY);
GM_OUT(GM_MIF_IRQ_MASK, 0xffc0);
}
/*
* Stop MIF autopolling of the PHY status register
*/
static void
mii_poll_stop(struct gmac *gm)
{
GM_OUT(GM_MIF_IRQ_MASK, 0xffff);
GM_BIC(GM_MIF_CFG, GM_MIF_CFGPE);
udelay(GM_MIF_POLL_DELAY);
}
/*
* Called when the MIF detect a change of the PHY status
*
* handles monitoring the link and updating GMAC with the correct
* duplex mode.
*
* Note: Are we missing status changes ? In this case, we'll have to
* a timer and control the autoneg. process more closely. Also, we may
* want to stop rx and tx side when the link is down.
*/
/* Link modes of the BCM5400 PHY */
static int phy_BCM5400_link_table[8][3] = {
{ 0, 0, 0 }, /* No link */
{ 0, 0, 0 }, /* 10BT Half Duplex */
{ 1, 0, 0 }, /* 10BT Full Duplex */
{ 0, 1, 0 }, /* 100BT Half Duplex */
{ 0, 1, 0 }, /* 100BT Half Duplex */
{ 1, 1, 0 }, /* 100BT Full Duplex*/
{ 1, 0, 1 }, /* 1000BT */
{ 1, 0, 1 }, /* 1000BT */
};
static void
mii_interrupt(struct gmac *gm)
{
int phy_status;
int lpar_ability;
mii_poll_stop(gm);
/* May the status change before polling is re-enabled ? */
mii_poll_start(gm);
/* We read the Auxilliary Status Summary register */
phy_status = mii_read(gm, gm->phy_addr, MII_SR);
if ((phy_status ^ gm->phy_status) & (MII_SR_ASSC | MII_SR_LKS)) {
int full_duplex = 0;
int link_100 = 0;
int gigabit = 0;
#ifdef DEBUG_PHY
printk(KERN_INFO "%s: Link state change, phy_status: 0x%04x\n",
gm->dev->name, phy_status);
#endif
gm->phy_status = phy_status;
/* Should we enable that in generic mode ? */
lpar_ability = mii_read(gm, gm->phy_addr, MII_ANLPA);
if (lpar_ability & MII_ANLPA_PAUS)
GM_BIS(GM_MAC_CTRL_CONFIG, GM_MAC_CTRL_CONF_SND_PAUSE_EN);
else
GM_BIC(GM_MAC_CTRL_CONFIG, GM_MAC_CTRL_CONF_SND_PAUSE_EN);
/* Link ? Check for speed and duplex */
if ((phy_status & MII_SR_LKS) && (phy_status & MII_SR_ASSC)) {
int restart = 0;
int aux_stat, link;
switch (gm->phy_type) {
case PHY_B5201:
case PHY_B5221:
aux_stat = mii_read(gm, gm->phy_addr, MII_BCM5201_AUXCTLSTATUS);
#ifdef DEBUG_PHY
printk(KERN_INFO "%s: Link up ! BCM5201/5221 aux_stat: 0x%04x\n",
gm->dev->name, aux_stat);
#endif
full_duplex = ((aux_stat & MII_BCM5201_AUXCTLSTATUS_DUPLEX) != 0);
link_100 = ((aux_stat & MII_BCM5201_AUXCTLSTATUS_SPEED) != 0);
break;
case PHY_B5400:
case PHY_B5401:
case PHY_B5411:
aux_stat = mii_read(gm, gm->phy_addr, MII_BCM5400_AUXSTATUS);
link = (aux_stat & MII_BCM5400_AUXSTATUS_LINKMODE_MASK) >>
MII_BCM5400_AUXSTATUS_LINKMODE_SHIFT;
#ifdef DEBUG_PHY
printk(KERN_INFO "%s: Link up ! BCM54xx aux_stat: 0x%04x (link mode: %d)\n",
gm->dev->name, aux_stat, link);
#endif
full_duplex = phy_BCM5400_link_table[link][0];
link_100 = phy_BCM5400_link_table[link][1];
gigabit = phy_BCM5400_link_table[link][2];
break;
case PHY_LXT971:
aux_stat = mii_read(gm, gm->phy_addr, MII_LXT971_STATUS2);
#ifdef DEBUG_PHY
printk(KERN_INFO "%s: Link up ! LXT971 stat2: 0x%04x\n",
gm->dev->name, aux_stat);
#endif
full_duplex = ((aux_stat & MII_LXT971_STATUS2_FULLDUPLEX) != 0);
link_100 = ((aux_stat & MII_LXT971_STATUS2_SPEED) != 0);
break;
default:
full_duplex = (lpar_ability & MII_ANLPA_FDAM) != 0;
link_100 = (lpar_ability & MII_ANLPA_100M) != 0;
break;
}
#ifdef DEBUG_PHY
printk(KERN_INFO "%s: Full Duplex: %d, Speed: %s\n",
gm->dev->name, full_duplex,
gigabit ? "1000" : (link_100 ? "100" : "10"));
#endif
if (gigabit != gm->gigabit) {
gm->gigabit = gigabit;
gmac_set_gigabit_mode(gm, gm->gigabit);
restart = 1;
}
if (full_duplex != gm->full_duplex) {
gm->full_duplex = full_duplex;
gmac_set_duplex_mode(gm, gm->full_duplex);
restart = 1;
}
if (restart)
gmac_start_dma(gm);
} else if (!(phy_status & MII_SR_LKS)) {
#ifdef DEBUG_PHY
printk(KERN_INFO "%s: Link down !\n", gm->dev->name);
#endif
}
}
}
#ifdef CONFIG_PMAC_PBOOK
/* Power management: stop PHY chip for suspend mode
*
* TODO: This will have to be modified is WOL is to be supported.
*/
static void
gmac_suspend(struct gmac* gm)
{
int data, timeout;
unsigned long flags;
gm->sleeping = 1;
netif_device_detach(gm->dev);
spin_lock_irqsave(&gm->lock, flags);
if (gm->opened) {
disable_irq(gm->dev->irq);
/* Stop polling PHY */
mii_poll_stop(gm);
}
/* Mask out all chips interrupts */
GM_OUT(GM_IRQ_MASK, 0xffffffff);
spin_unlock_irqrestore(&gm->lock, flags);
if (gm->opened) {
int i;
/* Empty Tx ring of any remaining gremlins */
gmac_tx_cleanup(gm->dev, 1);
/* Empty Rx ring of any remaining gremlins */
for (i = 0; i < NRX; ++i) {
if (gm->rx_buff[i] != 0) {
dev_kfree_skb_irq(gm->rx_buff[i]);
gm->rx_buff[i] = 0;
}
}
}
/* Clear interrupts on 5201 */
if (gm->phy_type == PHY_B5201 || gm->phy_type == PHY_B5221)
mii_write(gm, gm->phy_addr, MII_BCM5201_INTERRUPT, 0);
/* Drive MDIO high */
GM_OUT(GM_MIF_CFG, 0);
/* Unchanged, don't ask me why */
data = mii_read(gm, gm->phy_addr, MII_ANLPA);
mii_write(gm, gm->phy_addr, MII_ANLPA, data);
/* Stop everything */
GM_OUT(GM_MAC_RX_CONFIG, 0);
GM_OUT(GM_MAC_TX_CONFIG, 0);
GM_OUT(GM_MAC_XIF_CONFIG, 0);
GM_OUT(GM_TX_CONF, 0);
GM_OUT(GM_RX_CONF, 0);
/* Set MAC in reset state */
GM_OUT(GM_RESET, GM_RESET_TX | GM_RESET_RX);
for (timeout = 100; timeout > 0; --timeout) {
mdelay(10);
if ((GM_IN(GM_RESET) & (GM_RESET_TX | GM_RESET_RX)) == 0)
break;
}
GM_OUT(GM_MAC_TX_RESET, GM_MAC_TX_RESET_NOW);
GM_OUT(GM_MAC_RX_RESET, GM_MAC_RX_RESET_NOW);
/* Superisolate PHY */
if (gm->phy_type == PHY_B5201 || gm->phy_type == PHY_B5221)
mii_write(gm, gm->phy_addr, MII_BCM5201_MULTIPHY,
MII_BCM5201_MULTIPHY_SUPERISOLATE);
/* Put MDIO in sane electric state. According to an obscure
* Apple comment, not doing so may let them drive some current
* during sleep and possibly damage BCM PHYs.
*/
GM_OUT(GM_MIF_CFG, GM_MIF_CFGBB);
GM_OUT(GM_MIF_BB_CLOCK, 0);
GM_OUT(GM_MIF_BB_DATA, 0);
GM_OUT(GM_MIF_BB_OUT_ENABLE, 0);
GM_OUT(GM_MAC_XIF_CONFIG,
GM_MAC_XIF_CONF_GMII_MODE|GM_MAC_XIF_CONF_MII_INT_LOOP);
(void)GM_IN(GM_MAC_XIF_CONFIG);
/* Unclock the GMAC chip */
gmac_set_power(gm, 0);
}
static void
gmac_resume(struct gmac *gm)
{
int data;
if (gmac_powerup_and_reset(gm->dev)) {
printk(KERN_ERR "%s: Couldn't revive gmac ethernet !\n", gm->dev->name);
return;
}
gm->sleeping = 0;
if (gm->opened) {
/* Create fresh rings */
gmac_init_rings(gm, 1);
/* re-initialize the MAC */
gmac_mac_init(gm, gm->dev->dev_addr);
/* re-initialize the multicast tables & promisc mode if any */
gmac_set_multicast(gm->dev);
}
/* Early enable Tx and Rx so that we are clocked */
GM_BIS(GM_TX_CONF, GM_TX_CONF_DMA_EN);
mdelay(20);
GM_BIS(GM_RX_CONF, GM_RX_CONF_DMA_EN);
mdelay(20);
GM_BIS(GM_MAC_TX_CONFIG, GM_MAC_TX_CONF_ENABLE);
mdelay(20);
GM_BIS(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_ENABLE);
mdelay(20);
if (gm->phy_type == PHY_B5201 || gm->phy_type == PHY_B5221) {
data = mii_read(gm, gm->phy_addr, MII_BCM5201_MULTIPHY);
mii_write(gm, gm->phy_addr, MII_BCM5201_MULTIPHY,
data & ~MII_BCM5201_MULTIPHY_SUPERISOLATE);
}
mdelay(1);
if (gm->opened) {
/* restart polling PHY */
mii_interrupt(gm);
/* restart DMA operations */
gmac_start_dma(gm);
netif_device_attach(gm->dev);
enable_irq(gm->dev->irq);
} else {
/* Driver not opened, just leave things off. Note that
* we could be smart and superisolate the PHY when the
* driver is closed, but I won't do that unless I have
* a better understanding of some electrical issues with
* this PHY chip --BenH
*/
GM_OUT(GM_MAC_RX_CONFIG, 0);
GM_OUT(GM_MAC_TX_CONFIG, 0);
GM_OUT(GM_MAC_XIF_CONFIG, 0);
GM_OUT(GM_TX_CONF, 0);
GM_OUT(GM_RX_CONF, 0);
}
}
#endif
static int
mii_do_reset_phy(struct gmac *gm, int phy_addr)
{
int mii_control, timeout;
mii_control = mii_read(gm, phy_addr, MII_CR);
mii_write(gm, phy_addr, MII_CR, mii_control | MII_CR_RST);
mdelay(10);
for (timeout = 100; timeout > 0; --timeout) {
mii_control = mii_read(gm, phy_addr, MII_CR);
if (mii_control == -1) {
printk(KERN_ERR "%s PHY died after reset !\n",
gm->dev->name);
return 1;
}
if ((mii_control & MII_CR_RST) == 0)
break;
mdelay(10);
}
if (mii_control & MII_CR_RST) {
printk(KERN_ERR "%s PHY reset timeout !\n", gm->dev->name);
return 1;
}
mii_write(gm, phy_addr, MII_CR, mii_control & ~MII_CR_ISOL);
return 0;
}
/* Here's a bunch of configuration routines for
* Broadcom PHYs used on various Mac models. Unfortunately,
* except for the 5201, Broadcom never sent me any documentation,
* so this is from my understanding of Apple's Open Firmware
* drivers and Darwin's implementation
*/
static void
mii_init_BCM5400(struct gmac *gm)
{
int data;
/* Configure for gigabit full duplex */
data = mii_read(gm, gm->phy_addr, MII_BCM5400_AUXCONTROL);
data |= MII_BCM5400_AUXCONTROL_PWR10BASET;
mii_write(gm, gm->phy_addr, MII_BCM5400_AUXCONTROL, data);
data = mii_read(gm, gm->phy_addr, MII_BCM5400_GB_CONTROL);
data |= MII_BCM5400_GB_CONTROL_FULLDUPLEXCAP;
mii_write(gm, gm->phy_addr, MII_BCM5400_GB_CONTROL, data);
mdelay(10);
/* Reset and configure cascaded 10/100 PHY */
mii_do_reset_phy(gm, 0x1f);
data = mii_read(gm, 0x1f, MII_BCM5201_MULTIPHY);
data |= MII_BCM5201_MULTIPHY_SERIALMODE;
mii_write(gm, 0x1f, MII_BCM5201_MULTIPHY, data);
data = mii_read(gm, gm->phy_addr, MII_BCM5400_AUXCONTROL);
data &= ~MII_BCM5400_AUXCONTROL_PWR10BASET;
mii_write(gm, gm->phy_addr, MII_BCM5400_AUXCONTROL, data);
}
static void
mii_init_BCM5401(struct gmac *gm)
{
int data;
int rev;
rev = mii_read(gm, gm->phy_addr, MII_ID1) & 0x000f;
if (rev == 0 || rev == 3) {
/* Some revisions of 5401 appear to need this
* initialisation sequence to disable, according
* to OF, "tap power management"
*
* WARNING ! OF and Darwin don't agree on the
* register addresses. OF seem to interpret the
* register numbers below as decimal
*/
mii_write(gm, gm->phy_addr, 0x18, 0x0c20);
mii_write(gm, gm->phy_addr, 0x17, 0x0012);
mii_write(gm, gm->phy_addr, 0x15, 0x1804);
mii_write(gm, gm->phy_addr, 0x17, 0x0013);
mii_write(gm, gm->phy_addr, 0x15, 0x1204);
mii_write(gm, gm->phy_addr, 0x17, 0x8006);
mii_write(gm, gm->phy_addr, 0x15, 0x0132);
mii_write(gm, gm->phy_addr, 0x17, 0x8006);
mii_write(gm, gm->phy_addr, 0x15, 0x0232);
mii_write(gm, gm->phy_addr, 0x17, 0x201f);
mii_write(gm, gm->phy_addr, 0x15, 0x0a20);
}
/* Configure for gigabit full duplex */
data = mii_read(gm, gm->phy_addr, MII_BCM5400_GB_CONTROL);
data |= MII_BCM5400_GB_CONTROL_FULLDUPLEXCAP;
mii_write(gm, gm->phy_addr, MII_BCM5400_GB_CONTROL, data);
mdelay(10);
/* Reset and configure cascaded 10/100 PHY */
mii_do_reset_phy(gm, 0x1f);
data = mii_read(gm, 0x1f, MII_BCM5201_MULTIPHY);
data |= MII_BCM5201_MULTIPHY_SERIALMODE;
mii_write(gm, 0x1f, MII_BCM5201_MULTIPHY, data);
}
static void
mii_init_BCM5411(struct gmac *gm)
{
int data;
/* Here's some more Apple black magic to setup
* some voltage stuffs.
*/
mii_write(gm, gm->phy_addr, 0x1c, 0x8c23);
mii_write(gm, gm->phy_addr, 0x1c, 0x8ca3);
mii_write(gm, gm->phy_addr, 0x1c, 0x8c23);
/* Here, Apple seems to want to reset it, do
* it as well
*/
mii_write(gm, gm->phy_addr, MII_CR, MII_CR_RST);
/* Start autoneg */
mii_write(gm, gm->phy_addr, MII_CR,
MII_CR_ASSE|MII_CR_FDM| /* Autospeed, full duplex */
MII_CR_RAN|
MII_CR_SPEEDSEL2 /* chip specific, gigabit enable ? */);
data = mii_read(gm, gm->phy_addr, MII_BCM5400_GB_CONTROL);
data |= MII_BCM5400_GB_CONTROL_FULLDUPLEXCAP;
mii_write(gm, gm->phy_addr, MII_BCM5400_GB_CONTROL, data);
}
static int
mii_lookup_and_reset(struct gmac *gm)
{
int i, mii_status, mii_control;
gm->phy_addr = -1;
gm->phy_type = PHY_UNKNOWN;
/* Hard reset the PHY */
pmac_call_feature(PMAC_FTR_GMAC_PHY_RESET, gm->of_node, 0, 0);
/* Find the PHY */
for(i=0; i<=31; i++) {
mii_control = mii_read(gm, i, MII_CR);
mii_status = mii_read(gm, i, MII_SR);
if (mii_control != -1 && mii_status != -1 &&
(mii_control != 0xffff || mii_status != 0xffff))
break;
}
gm->phy_addr = i;
if (gm->phy_addr > 31)
return 0;
/* Reset it */
if (mii_do_reset_phy(gm, gm->phy_addr))
goto fail;
/* Read the PHY ID */
gm->phy_id = (mii_read(gm, gm->phy_addr, MII_ID0) << 16) |
mii_read(gm, gm->phy_addr, MII_ID1);
#ifdef DEBUG_PHY
printk(KERN_INFO "%s: PHY ID: 0x%08x\n", gm->dev->name, gm->phy_id);
#endif
if ((gm->phy_id & MII_BCM5400_MASK) == MII_BCM5400_ID) {
gm->phy_type = PHY_B5400;
printk(KERN_INFO "%s: Found Broadcom BCM5400 PHY (Gigabit)\n",
gm->dev->name);
mii_init_BCM5400(gm);
} else if ((gm->phy_id & MII_BCM5401_MASK) == MII_BCM5401_ID) {
gm->phy_type = PHY_B5401;
printk(KERN_INFO "%s: Found Broadcom BCM5401 PHY (Gigabit)\n",
gm->dev->name);
mii_init_BCM5401(gm);
} else if ((gm->phy_id & MII_BCM5411_MASK) == MII_BCM5411_ID) {
gm->phy_type = PHY_B5411;
printk(KERN_INFO "%s: Found Broadcom BCM5411 PHY (Gigabit)\n",
gm->dev->name);
mii_init_BCM5411(gm);
} else if ((gm->phy_id & MII_BCM5201_MASK) == MII_BCM5201_ID) {
gm->phy_type = PHY_B5201;
printk(KERN_INFO "%s: Found Broadcom BCM5201 PHY\n", gm->dev->name);
} else if ((gm->phy_id & MII_BCM5221_MASK) == MII_BCM5221_ID) {
gm->phy_type = PHY_B5221;
printk(KERN_INFO "%s: Found Broadcom BCM5221 PHY\n", gm->dev->name);
} else if ((gm->phy_id & MII_LXT971_MASK) == MII_LXT971_ID) {
gm->phy_type = PHY_LXT971;
printk(KERN_INFO "%s: Found LevelOne LX971 PHY\n", gm->dev->name);
} else {
printk(KERN_WARNING "%s: Warning ! Unknown PHY ID 0x%08x, using generic mode...\n",
gm->dev->name, gm->phy_id);
}
return 1;
fail:
gm->phy_addr = -1;
return 0;
}
/*
* Setup the PHY autonegociation parameters
*
* Code to force the PHY duplex mode and speed should be
* added here
*/
static void
mii_setup_phy(struct gmac *gm)
{
int data;
/* Stop auto-negociation */
data = mii_read(gm, gm->phy_addr, MII_CR);
mii_write(gm, gm->phy_addr, MII_CR, data & ~MII_CR_ASSE);
/* Set advertisement to 10/100 and Half/Full duplex
* (full capabilities) */
data = mii_read(gm, gm->phy_addr, MII_ANA);
data |= MII_ANA_TXAM | MII_ANA_FDAM | MII_ANA_10M;
mii_write(gm, gm->phy_addr, MII_ANA, data);
/* Restart auto-negociation */
data = mii_read(gm, gm->phy_addr, MII_CR);
data |= MII_CR_ASSE;
mii_write(gm, gm->phy_addr, MII_CR, data);
data |= MII_CR_RAN;
mii_write(gm, gm->phy_addr, MII_CR, data);
}
/*
* Turn On/Off the gmac cell inside Uni-N
*
* ToDo: Add code to support powering down of the PHY.
*/
static void
gmac_set_power(struct gmac *gm, int power_up)
{
if (power_up) {
pmac_call_feature(PMAC_FTR_GMAC_ENABLE, gm->of_node, 0, 1);
if (gm->pci_devfn != 0xff) {
u16 cmd;
/*
* Make sure PCI is correctly configured
*
* We use old pci_bios versions of the function since, by
* default, gmac is not powered up, and so will be absent
* from the kernel initial PCI lookup.
*
* Should be replaced by 2.4 new PCI mecanisms and really
* regiser the device.
*/
pcibios_read_config_word(gm->pci_bus, gm->pci_devfn,
PCI_COMMAND, &cmd);
cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
pcibios_write_config_word(gm->pci_bus, gm->pci_devfn,
PCI_COMMAND, cmd);
pcibios_write_config_byte(gm->pci_bus, gm->pci_devfn,
PCI_LATENCY_TIMER, 16);
pcibios_write_config_byte(gm->pci_bus, gm->pci_devfn,
PCI_CACHE_LINE_SIZE, 8);
}
} else {
pmac_call_feature(PMAC_FTR_GMAC_ENABLE, gm->of_node, 0, 0);
}
}
/*
* Makes sure the GMAC cell is powered up, and reset it
*/
static int
gmac_powerup_and_reset(struct net_device *dev)
{
struct gmac *gm = (struct gmac *) dev->priv;
int timeout;
/* turn on GB clock */
gmac_set_power(gm, 1);
/* Perform a software reset */
GM_OUT(GM_RESET, GM_RESET_TX | GM_RESET_RX);
for (timeout = 100; timeout > 0; --timeout) {
mdelay(10);
if ((GM_IN(GM_RESET) & (GM_RESET_TX | GM_RESET_RX)) == 0) {
/* Mask out all chips interrupts */
GM_OUT(GM_IRQ_MASK, 0xffffffff);
GM_OUT(GM_MAC_TX_RESET, GM_MAC_TX_RESET_NOW);
GM_OUT(GM_MAC_RX_RESET, GM_MAC_RX_RESET_NOW);
return 0;
}
}
printk(KERN_ERR "%s reset failed!\n", dev->name);
gmac_set_power(gm, 0);
gm->phy_type = 0;
return -1;
}
/*
* Set the MAC duplex mode.
*
* Side effect: stops Tx MAC
*/
static void
gmac_set_duplex_mode(struct gmac *gm, int full_duplex)
{
/* Stop Tx MAC */
GM_BIC(GM_MAC_TX_CONFIG, GM_MAC_TX_CONF_ENABLE);
while(GM_IN(GM_MAC_TX_CONFIG) & GM_MAC_TX_CONF_ENABLE)
;
if (full_duplex) {
GM_BIS(GM_MAC_TX_CONFIG, GM_MAC_TX_CONF_IGNORE_CARRIER
| GM_MAC_TX_CONF_IGNORE_COLL);
GM_BIC(GM_MAC_XIF_CONFIG, GM_MAC_XIF_CONF_DISABLE_ECHO);
} else {
GM_BIC(GM_MAC_TX_CONFIG, GM_MAC_TX_CONF_IGNORE_CARRIER
| GM_MAC_TX_CONF_IGNORE_COLL);
GM_BIS(GM_MAC_XIF_CONFIG, GM_MAC_XIF_CONF_DISABLE_ECHO);
}
}
/* Set the MAC gigabit mode. Side effect: stops Tx MAC */
static void
gmac_set_gigabit_mode(struct gmac *gm, int gigabit)
{
/* Stop Tx MAC */
GM_BIC(GM_MAC_TX_CONFIG, GM_MAC_TX_CONF_ENABLE);
while(GM_IN(GM_MAC_TX_CONFIG) & GM_MAC_TX_CONF_ENABLE)
;
if (gigabit) {
GM_BIS(GM_MAC_XIF_CONFIG, GM_MAC_XIF_CONF_GMII_MODE);
} else {
GM_BIC(GM_MAC_XIF_CONFIG, GM_MAC_XIF_CONF_GMII_MODE);
}
}
/*
* Initialize a bunch of registers to put the chip into a known
* and hopefully happy state
*/
static void
gmac_mac_init(struct gmac *gm, unsigned char *mac_addr)
{
int i, fifo_size;
/* Set random seed to low bits of MAC address */
GM_OUT(GM_MAC_RANDOM_SEED, mac_addr[5] | (mac_addr[4] << 8));
/* Configure the data path mode to MII/GII */
GM_OUT(GM_PCS_DATAPATH_MODE, GM_PCS_DATAPATH_MII);
/* Configure XIF to MII mode. Full duplex led is set
* by Apple, so...
*/
GM_OUT(GM_MAC_XIF_CONFIG, GM_MAC_XIF_CONF_TX_MII_OUT_EN
| GM_MAC_XIF_CONF_FULL_DPLX_LED);
/* Mask out all MAC interrupts */
GM_OUT(GM_MAC_TX_MASK, 0xffff);
GM_OUT(GM_MAC_RX_MASK, 0xffff);
GM_OUT(GM_MAC_CTRLSTAT_MASK, 0xff);
/* Setup bits of MAC */
GM_OUT(GM_MAC_SND_PAUSE, GM_MAC_SND_PAUSE_DEFAULT);
GM_OUT(GM_MAC_CTRL_CONFIG, GM_MAC_CTRL_CONF_RCV_PAUSE_EN);
/* Configure GEM DMA */
GM_OUT(GM_GCONF, GM_GCONF_BURST_SZ |
(31 << GM_GCONF_TXDMA_LIMIT_SHIFT) |
(31 << GM_GCONF_RXDMA_LIMIT_SHIFT));
GM_OUT(GM_TX_CONF,
(GM_TX_CONF_FIFO_THR_DEFAULT << GM_TX_CONF_FIFO_THR_SHIFT) |
NTX_CONF);
/* 34 byte offset for checksum computation. This works because ip_input() will clear out
* the skb->csum and skb->ip_summed fields and recompute the csum if IP options are
* present in the header. 34 == (ethernet header len) + sizeof(struct iphdr)
*/
GM_OUT(GM_RX_CONF,
(RX_OFFSET << GM_RX_CONF_FBYTE_OFF_SHIFT) |
(0x22 << GM_RX_CONF_CHK_START_SHIFT) |
(GM_RX_CONF_DMA_THR_DEFAULT << GM_RX_CONF_DMA_THR_SHIFT) |
NRX_CONF);
/* Configure other bits of MAC */
GM_OUT(GM_MAC_INTR_PKT_GAP0, GM_MAC_INTR_PKT_GAP0_DEFAULT);
GM_OUT(GM_MAC_INTR_PKT_GAP1, GM_MAC_INTR_PKT_GAP1_DEFAULT);
GM_OUT(GM_MAC_INTR_PKT_GAP2, GM_MAC_INTR_PKT_GAP2_DEFAULT);
GM_OUT(GM_MAC_MIN_FRAME_SIZE, GM_MAC_MIN_FRAME_SIZE_DEFAULT);
GM_OUT(GM_MAC_MAX_FRAME_SIZE, GM_MAC_MAX_FRAME_SIZE_DEFAULT);
GM_OUT(GM_MAC_PREAMBLE_LEN, GM_MAC_PREAMBLE_LEN_DEFAULT);
GM_OUT(GM_MAC_JAM_SIZE, GM_MAC_JAM_SIZE_DEFAULT);
GM_OUT(GM_MAC_ATTEMPT_LIMIT, GM_MAC_ATTEMPT_LIMIT_DEFAULT);
GM_OUT(GM_MAC_SLOT_TIME, GM_MAC_SLOT_TIME_DEFAULT);
GM_OUT(GM_MAC_CONTROL_TYPE, GM_MAC_CONTROL_TYPE_DEFAULT);
/* Setup MAC addresses, clear filters, clear hash table */
GM_OUT(GM_MAC_ADDR_NORMAL0, (mac_addr[4] << 8) + mac_addr[5]);
GM_OUT(GM_MAC_ADDR_NORMAL1, (mac_addr[2] << 8) + mac_addr[3]);
GM_OUT(GM_MAC_ADDR_NORMAL2, (mac_addr[0] << 8) + mac_addr[1]);
GM_OUT(GM_MAC_ADDR_ALT0, 0);
GM_OUT(GM_MAC_ADDR_ALT1, 0);
GM_OUT(GM_MAC_ADDR_ALT2, 0);
GM_OUT(GM_MAC_ADDR_CTRL0, 0x0001);
GM_OUT(GM_MAC_ADDR_CTRL1, 0xc200);
GM_OUT(GM_MAC_ADDR_CTRL2, 0x0180);
GM_OUT(GM_MAC_ADDR_FILTER0, 0);
GM_OUT(GM_MAC_ADDR_FILTER1, 0);
GM_OUT(GM_MAC_ADDR_FILTER2, 0);
GM_OUT(GM_MAC_ADDR_FILTER_MASK1_2, 0);
GM_OUT(GM_MAC_ADDR_FILTER_MASK0, 0);
for (i = 0; i < 27; ++i)
GM_OUT(GM_MAC_ADDR_FILTER_HASH0 + i, 0);
/* Clear stat counters */
GM_OUT(GM_MAC_COLLISION_CTR, 0);
GM_OUT(GM_MAC_FIRST_COLLISION_CTR, 0);
GM_OUT(GM_MAC_EXCS_COLLISION_CTR, 0);
GM_OUT(GM_MAC_LATE_COLLISION_CTR, 0);
GM_OUT(GM_MAC_DEFER_TIMER_COUNTER, 0);
GM_OUT(GM_MAC_PEAK_ATTEMPTS, 0);
GM_OUT(GM_MAC_RX_FRAME_CTR, 0);
GM_OUT(GM_MAC_RX_LEN_ERR_CTR, 0);
GM_OUT(GM_MAC_RX_ALIGN_ERR_CTR, 0);
GM_OUT(GM_MAC_RX_CRC_ERR_CTR, 0);
GM_OUT(GM_MAC_RX_CODE_VIOLATION_CTR, 0);
/* default to half duplex */
GM_OUT(GM_MAC_TX_CONFIG, 0);
GM_OUT(GM_MAC_RX_CONFIG, 0);
gmac_set_duplex_mode(gm, gm->full_duplex);
/* Setup pause thresholds */
fifo_size = GM_IN(GM_RX_FIFO_SIZE);
GM_OUT(GM_RX_PTH,
((fifo_size - ((GM_MAC_MAX_FRAME_SIZE_ALIGN + 8) * 2 / GM_RX_PTH_UNITS))
<< GM_RX_PTH_OFF_SHIFT) |
((fifo_size - ((GM_MAC_MAX_FRAME_SIZE_ALIGN + 8) * 3 / GM_RX_PTH_UNITS))
<< GM_RX_PTH_ON_SHIFT));
/* Setup interrupt blanking */
if (GM_IN(GM_BIF_CFG) & GM_BIF_CFG_M66EN)
GM_OUT(GM_RX_BLANK, (5 << GM_RX_BLANK_INTR_PACKETS_SHIFT)
| (8 << GM_RX_BLANK_INTR_TIME_SHIFT));
else
GM_OUT(GM_RX_BLANK, (5 << GM_RX_BLANK_INTR_PACKETS_SHIFT)
| (4 << GM_RX_BLANK_INTR_TIME_SHIFT));
}
/*
* Fill the Rx and Tx rings with good initial values, alloc
* fresh Rx skb's.
*/
static void
gmac_init_rings(struct gmac *gm, int from_irq)
{
int i;
struct sk_buff *skb;
unsigned char *data;
struct gmac_dma_desc *ring;
int gfp_flags = GFP_KERNEL;
if (from_irq || in_interrupt())
gfp_flags = GFP_ATOMIC;
/* init rx ring */
ring = (struct gmac_dma_desc *) gm->rxring;
memset(ring, 0, NRX * sizeof(struct gmac_dma_desc));
for (i = 0; i < NRX; ++i, ++ring) {
data = dummy_buf;
gm->rx_buff[i] = skb = gmac_alloc_skb(RX_BUF_ALLOC_SIZE, gfp_flags);
if (skb != 0) {
skb->dev = gm->dev;
skb_put(skb, ETH_FRAME_LEN + RX_OFFSET);
skb_reserve(skb, RX_OFFSET);
data = skb->data - RX_OFFSET;
}
st_le32(&ring->lo_addr, virt_to_bus(data));
st_le32(&ring->size, RX_SZ_OWN | ((RX_BUF_ALLOC_SIZE-RX_OFFSET) << RX_SZ_SHIFT));
}
/* init tx ring */
ring = (struct gmac_dma_desc *) gm->txring;
memset(ring, 0, NTX * sizeof(struct gmac_dma_desc));
gm->next_rx = 0;
gm->next_tx = 0;
gm->tx_gone = 0;
/* set pointers in chip */
mb();
GM_OUT(GM_RX_DESC_HI, 0);
GM_OUT(GM_RX_DESC_LO, virt_to_bus(gm->rxring));
GM_OUT(GM_TX_DESC_HI, 0);
GM_OUT(GM_TX_DESC_LO, virt_to_bus(gm->txring));
}
/*
* Start the Tx and Rx DMA engines and enable interrupts
*
* Note: The various mdelay(20); come from Darwin implentation. Some
* tests (doc ?) are needed to replace those with something more intrusive.
*/
static void
gmac_start_dma(struct gmac *gm)
{
/* Enable Tx and Rx */
GM_BIS(GM_TX_CONF, GM_TX_CONF_DMA_EN);
mdelay(20);
GM_BIS(GM_RX_CONF, GM_RX_CONF_DMA_EN);
mdelay(20);
GM_BIS(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_ENABLE);
mdelay(20);
GM_BIS(GM_MAC_TX_CONFIG, GM_MAC_TX_CONF_ENABLE);
mdelay(20);
/* Kick the receiver and enable interrupts */
GM_OUT(GM_RX_KICK, NRX);
GM_BIC(GM_IRQ_MASK, GM_IRQ_TX_INT_ME |
GM_IRQ_TX_ALL |
GM_IRQ_RX_DONE |
GM_IRQ_RX_TAG_ERR |
GM_IRQ_MAC_RX |
GM_IRQ_MIF |
GM_IRQ_BUS_ERROR);
}
/*
* Stop the Tx and Rx DMA engines after disabling interrupts
*
* Note: The various mdelay(20); come from Darwin implentation. Some
* tests (doc ?) are needed to replace those with something more intrusive.
*/
static void
gmac_stop_dma(struct gmac *gm)
{
/* disable interrupts */
GM_OUT(GM_IRQ_MASK, 0xffffffff);
/* Enable Tx and Rx */
GM_BIC(GM_TX_CONF, GM_TX_CONF_DMA_EN);
mdelay(20);
GM_BIC(GM_RX_CONF, GM_RX_CONF_DMA_EN);
mdelay(20);
GM_BIC(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_ENABLE);
mdelay(20);
GM_BIC(GM_MAC_TX_CONFIG, GM_MAC_TX_CONF_ENABLE);
mdelay(20);
}
/*
* Configure promisc mode and setup multicast hash table
* filter
*/
#define CRC_POLY 0xedb88320
static void
gmac_set_multicast(struct net_device *dev)
{
struct gmac *gm = (struct gmac *) dev->priv;
struct dev_mc_list *dmi = dev->mc_list;
int i,j,k,b;
unsigned long crc;
int multicast_hash = 0;
int multicast_all = 0;
int promisc = 0;
if (gm->sleeping)
return;
/* Lock out others. */
netif_stop_queue(dev);
if (dev->flags & IFF_PROMISC)
promisc = 1;
else if ((dev->flags & IFF_ALLMULTI) /* || (dev->mc_count > XXX) */) {
multicast_all = 1;
} else {
u16 hash_table[16];
for(i = 0; i < 16; i++)
hash_table[i] = 0;
for (i = 0; i < dev->mc_count; i++) {
crc = ~0;
for (j = 0; j < 6; ++j) {
b = dmi->dmi_addr[j];
for (k = 0; k < 8; ++k) {
if ((crc ^ b) & 1)
crc = (crc >> 1) ^ CRC_POLY;
else
crc >>= 1;
b >>= 1;
}
}
j = crc >> 24; /* bit number in multicast_filter */
hash_table[j >> 4] |= 1 << (15 - (j & 0xf));
dmi = dmi->next;
}
for (i = 0; i < 16; i++)
GM_OUT(GM_MAC_ADDR_FILTER_HASH0 + (i*4), hash_table[i]);
GM_BIS(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_HASH_ENABLE);
multicast_hash = 1;
}
if (promisc)
GM_BIS(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_RX_ALL);
else
GM_BIC(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_RX_ALL);
if (multicast_hash)
GM_BIS(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_HASH_ENABLE);
else
GM_BIC(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_HASH_ENABLE);
if (multicast_all)
GM_BIS(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_RX_ALL_MULTI);
else
GM_BIC(GM_MAC_RX_CONFIG, GM_MAC_RX_CONF_RX_ALL_MULTI);
/* Let us get going again. */
netif_wake_queue(dev);
}
/*
* Open the interface
*/
static int
gmac_open(struct net_device *dev)
{
int ret;
struct gmac *gm = (struct gmac *) dev->priv;
/* Power up and reset chip */
if (gmac_powerup_and_reset(dev))
return -EIO;
/* Get our interrupt */
ret = request_irq(dev->irq, gmac_interrupt, 0, dev->name, dev);
if (ret) {
printk(KERN_ERR "%s can't get irq %d\n", dev->name, dev->irq);
return ret;
}
gm->full_duplex = 0;
gm->phy_status = 0;
/* Find a PHY */
if (!mii_lookup_and_reset(gm))
printk(KERN_WARNING "%s WARNING ! Can't find PHY\n", dev->name);
/* Configure the PHY */
mii_setup_phy(gm);
/* Initialize the descriptor rings */
gmac_init_rings(gm, 0);
/* Initialize the MAC */
gmac_mac_init(gm, dev->dev_addr);
/* Initialize the multicast tables & promisc mode if any */
gmac_set_multicast(dev);
/*
* Check out PHY status and start auto-poll
*
* Note: do this before enabling interrutps
*/
mii_interrupt(gm);
/* Start the chip */
gmac_start_dma(gm);
gm->opened = 1;
return 0;
}
/*
* Close the interface
*/
static int
gmac_close(struct net_device *dev)
{
struct gmac *gm = (struct gmac *) dev->priv;
int i;
gm->opened = 0;
/* Stop chip and interrupts */
gmac_stop_dma(gm);
/* Stop polling PHY */
mii_poll_stop(gm);
/* Free interrupt */
free_irq(dev->irq, dev);
/* Shut down chip */
gmac_set_power(gm, 0);
gm->phy_type = 0;
/* Empty rings of any remaining gremlins */
for (i = 0; i < NRX; ++i) {
if (gm->rx_buff[i] != 0) {
dev_kfree_skb(gm->rx_buff[i]);
gm->rx_buff[i] = 0;
}
}
for (i = 0; i < NTX; ++i) {
if (gm->tx_buff[i] != 0) {
dev_kfree_skb(gm->tx_buff[i]);
gm->tx_buff[i] = 0;
}
}
return 0;
}
#ifdef CONFIG_PMAC_PBOOK
int
gmac_sleep_notify(struct pmu_sleep_notifier *self, int when)
{
struct gmac *gm;
/* XXX should handle more than one */
if (gmacs == NULL)
return PBOOK_SLEEP_OK;
gm = (struct gmac *) gmacs->priv;
if (!gm->opened)
return PBOOK_SLEEP_OK;
switch (when) {
case PBOOK_SLEEP_REQUEST:
break;
case PBOOK_SLEEP_REJECT:
break;
case PBOOK_SLEEP_NOW:
gmac_suspend(gm);
break;
case PBOOK_WAKE:
gmac_resume(gm);
break;
}
return PBOOK_SLEEP_OK;
}
#endif /* CONFIG_PMAC_PBOOK */
/*
* Handle a transmit timeout
*/
static void
gmac_tx_timeout(struct net_device *dev)
{
struct gmac *gm = (struct gmac *) dev->priv;
int i, timeout;
unsigned long flags;
if (gm->sleeping)
return;
printk (KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
spin_lock_irqsave(&gm->lock, flags);
/* Stop chip */
gmac_stop_dma(gm);
/* Empty Tx ring of any remaining gremlins */
gmac_tx_cleanup(dev, 1);
/* Empty Rx ring of any remaining gremlins */
for (i = 0; i < NRX; ++i) {
if (gm->rx_buff[i] != 0) {
dev_kfree_skb_irq(gm->rx_buff[i]);
gm->rx_buff[i] = 0;
}
}
/* Perform a software reset */
GM_OUT(GM_RESET, GM_RESET_TX | GM_RESET_RX);
for (timeout = 100; timeout > 0; --timeout) {
mdelay(10);
if ((GM_IN(GM_RESET) & (GM_RESET_TX | GM_RESET_RX)) == 0) {
/* Mask out all chips interrupts */
GM_OUT(GM_IRQ_MASK, 0xffffffff);
GM_OUT(GM_MAC_TX_RESET, GM_MAC_TX_RESET_NOW);
GM_OUT(GM_MAC_RX_RESET, GM_MAC_RX_RESET_NOW);
break;
}
}
if (!timeout)
printk(KERN_ERR "%s reset chip failed !\n", dev->name);
/* Create fresh rings */
gmac_init_rings(gm, 1);
/* re-initialize the MAC */
gmac_mac_init(gm, dev->dev_addr);
/* re-initialize the multicast tables & promisc mode if any */
gmac_set_multicast(dev);
/* Restart PHY auto-poll */
mii_interrupt(gm);
/* Restart chip */
gmac_start_dma(gm);
spin_unlock_irqrestore(&gm->lock, flags);
netif_wake_queue(dev);
}
/*
* Add a packet to the transmit ring
*/
static int
gmac_xmit_start(struct sk_buff *skb, struct net_device *dev)
{
struct gmac *gm = (struct gmac *) dev->priv;
volatile struct gmac_dma_desc *dp;
unsigned long flags;
int i;
if (gm->sleeping)
return 1;
spin_lock_irqsave(&gm->lock, flags);
i = gm->next_tx;
if (gm->tx_buff[i] != 0) {
/*
* Buffer is full, can't send this packet at the moment
*
* Can this ever happen in 2.4 ?
*/
netif_stop_queue(dev);
spin_unlock_irqrestore(&gm->lock, flags);
return 1;
}
gm->next_tx = (i + 1) & (NTX - 1);
gm->tx_buff[i] = skb;
dp = &gm->txring[i];
/* FIXME: Interrupt on all packet for now, change this to every N packet,
* with N to be adjusted
*/
dp->flags = TX_FL_INTERRUPT;
dp->hi_addr = 0;
st_le32(&dp->lo_addr, virt_to_bus(skb->data));
mb();
st_le32(&dp->size, TX_SZ_SOP | TX_SZ_EOP | skb->len);
mb();
GM_OUT(GM_TX_KICK, gm->next_tx);
if (gm->tx_buff[gm->next_tx] != 0)
netif_stop_queue(dev);
spin_unlock_irqrestore(&gm->lock, flags);
dev->trans_start = jiffies;
return 0;
}
/*
* Handle servicing of the transmit ring by deallocating used
* Tx packets and restoring flow control when necessary
*/
static void
gmac_tx_cleanup(struct net_device *dev, int force_cleanup)
{
struct gmac *gm = (struct gmac *) dev->priv;
volatile struct gmac_dma_desc *dp;
struct sk_buff *skb;
int gone, i;
i = gm->tx_gone;
/* Note: If i==gone, we empty the entire ring. This works because
* if the ring was empty, we wouldn't have received the interrupt
*/
do {
gone = GM_IN(GM_TX_COMP);
skb = gm->tx_buff[i];
if (skb == NULL)
break;
dp = &gm->txring[i];
if (force_cleanup)
++gm->stats.tx_errors;
else {
++gm->stats.tx_packets;
gm->stats.tx_bytes += skb->len;
}
gm->tx_buff[i] = NULL;
dev_kfree_skb_irq(skb);
if (++i >= NTX)
i = 0;
} while (force_cleanup || i != gone);
gm->tx_gone = i;
if (!force_cleanup && netif_queue_stopped(dev) &&
(gm->tx_buff[gm->next_tx] == 0))
netif_wake_queue(dev);
}
/*
* Handle servicing of receive ring
*/
static void
gmac_receive(struct net_device *dev)
{
struct gmac *gm = (struct gmac *) dev->priv;
int i = gm->next_rx;
volatile struct gmac_dma_desc *dp;
struct sk_buff *skb, *new_skb;
int len, flags, drop, last;
unsigned char *data;
u16 csum;
last = -1;
for (;;) {
dp = &gm->rxring[i];
/* Buffer not yet filled, no more Rx buffers to handle */
if (ld_le32(&dp->size) & RX_SZ_OWN)
break;
/* Get packet length, flags, etc... */
len = (ld_le32(&dp->size) >> 16) & 0x7fff;
flags = ld_le32(&dp->flags);
skb = gm->rx_buff[i];
drop = 0;
new_skb = NULL;
csum = ld_le32(&dp->size) & RX_SZ_CKSUM_MASK;
/* Handle errors */
if ((len < ETH_ZLEN)||(flags & RX_FL_CRC_ERROR)||(!skb)) {
++gm->stats.rx_errors;
if (len < ETH_ZLEN)
++gm->stats.rx_length_errors;
if (flags & RX_FL_CRC_ERROR)
++gm->stats.rx_crc_errors;
if (!skb) {
++gm->stats.rx_dropped;
skb = gmac_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
if (skb) {
gm->rx_buff[i] = skb;
skb->dev = dev;
skb_put(skb, ETH_FRAME_LEN + RX_OFFSET);
skb_reserve(skb, RX_OFFSET);
}
}
drop = 1;
} else {
/* Large packet, alloc a new skb for the ring */
if (len > RX_COPY_THRESHOLD) {
new_skb = gmac_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
if(!new_skb) {
printk(KERN_INFO "%s: Out of SKBs in Rx, packet dropped !\n",
dev->name);
drop = 1;
++gm->stats.rx_dropped;
goto finish;
}
gm->rx_buff[i] = new_skb;
new_skb->dev = dev;
skb_put(new_skb, ETH_FRAME_LEN + RX_OFFSET);
skb_reserve(new_skb, RX_OFFSET);
skb_trim(skb, len);
} else {
/* Small packet, copy it to a new small skb */
struct sk_buff *copy_skb = dev_alloc_skb(len + RX_OFFSET);
if(!copy_skb) {
printk(KERN_INFO "%s: Out of SKBs in Rx, packet dropped !\n",
dev->name);
drop = 1;
++gm->stats.rx_dropped;
goto finish;
}
copy_skb->dev = dev;
skb_reserve(copy_skb, RX_OFFSET);
skb_put(copy_skb, len);
memcpy(copy_skb->data, skb->data, len);
new_skb = skb;
skb = copy_skb;
}
}
finish:
/* Need to drop packet ? */
if (drop) {
new_skb = skb;
skb = NULL;
}
/* Put back ring entry */
data = new_skb ? (new_skb->data - RX_OFFSET) : dummy_buf;
dp->hi_addr = 0;
st_le32(&dp->lo_addr, virt_to_bus(data));
mb();
st_le32(&dp->size, RX_SZ_OWN | ((RX_BUF_ALLOC_SIZE-RX_OFFSET) << RX_SZ_SHIFT));
/* Got Rx packet ? */
if (skb) {
/* Yes, baby, keep that hot ;) */
if(!(csum ^ 0xffff))
skb->ip_summed = CHECKSUM_UNNECESSARY;
else
skb->ip_summed = CHECKSUM_NONE;
skb->ip_summed = CHECKSUM_NONE;
skb->protocol = eth_type_trans(skb, dev);
gm->stats.rx_bytes += skb->len;
netif_rx(skb);
dev->last_rx = jiffies;
++gm->stats.rx_packets;
}
last = i;
if (++i >= NRX)
i = 0;
}
gm->next_rx = i;
if (last >= 0) {
mb();
GM_OUT(GM_RX_KICK, last & 0xfffffffc);
}
}
/*
* Service chip interrupts
*/
static void
gmac_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct net_device *dev = (struct net_device *) dev_id;
struct gmac *gm = (struct gmac *) dev->priv;
unsigned int status;
status = GM_IN(GM_IRQ_STATUS);
if (status & (GM_IRQ_BUS_ERROR | GM_IRQ_MIF))
GM_OUT(GM_IRQ_ACK, status & (GM_IRQ_BUS_ERROR | GM_IRQ_MIF));
if (status & (GM_IRQ_RX_TAG_ERR | GM_IRQ_BUS_ERROR)) {
printk(KERN_ERR "%s: IRQ Error status: 0x%08x\n",
dev->name, status);
}
if (status & GM_IRQ_MIF) {
spin_lock(&gm->lock);
mii_interrupt(gm);
spin_unlock(&gm->lock);
}
if (status & GM_IRQ_RX_DONE) {
spin_lock(&gm->lock);
gmac_receive(dev);
spin_unlock(&gm->lock);
}
if (status & (GM_IRQ_TX_INT_ME | GM_IRQ_TX_ALL)) {
spin_lock(&gm->lock);
gmac_tx_cleanup(dev, 0);
spin_unlock(&gm->lock);
}
}
/*
* Retreive some error stats from chip and return them
* to above layer
*/
static struct net_device_stats *
gmac_stats(struct net_device *dev)
{
struct gmac *gm = (struct gmac *) dev->priv;
struct net_device_stats *stats = &gm->stats;
if (gm && gm->opened && !gm->sleeping) {
stats->rx_crc_errors += GM_IN(GM_MAC_RX_CRC_ERR_CTR);
GM_OUT(GM_MAC_RX_CRC_ERR_CTR, 0);
stats->rx_frame_errors += GM_IN(GM_MAC_RX_ALIGN_ERR_CTR);
GM_OUT(GM_MAC_RX_ALIGN_ERR_CTR, 0);
stats->rx_length_errors += GM_IN(GM_MAC_RX_LEN_ERR_CTR);
GM_OUT(GM_MAC_RX_LEN_ERR_CTR, 0);
stats->tx_aborted_errors += GM_IN(GM_MAC_EXCS_COLLISION_CTR);
stats->collisions +=
(GM_IN(GM_MAC_EXCS_COLLISION_CTR) +
GM_IN(GM_MAC_LATE_COLLISION_CTR));
GM_OUT(GM_MAC_EXCS_COLLISION_CTR, 0);
GM_OUT(GM_MAC_LATE_COLLISION_CTR, 0);
}
return stats;
}
static int __init
gmac_probe(void)
{
struct device_node *gmac;
/* We bump use count during probe since get_free_page can sleep
* which can be a race condition if module is unloaded at this
* point.
*/
MOD_INC_USE_COUNT;
/*
* We don't use PCI scanning on pmac since the GMAC cell is disabled
* by default, and thus absent from kernel original PCI probing.
*/
for (gmac = find_compatible_devices("network", "gmac"); gmac != 0;
gmac = gmac->next)
gmac_probe1(gmac);
#ifdef CONFIG_PMAC_PBOOK
if (gmacs)
pmu_register_sleep_notifier(&gmac_sleep_notifier);
#endif
MOD_DEC_USE_COUNT;
return gmacs? 0: -ENODEV;
}
static void
gmac_probe1(struct device_node *gmac)
{
struct gmac *gm;
unsigned long tx_descpage, rx_descpage;
unsigned char *addr;
struct net_device *dev;
int i;
if (gmac->n_addrs < 1 || gmac->n_intrs < 1) {
printk(KERN_ERR "can't use GMAC %s: %d addrs and %d intrs\n",
gmac->full_name, gmac->n_addrs, gmac->n_intrs);
return;
}
addr = get_property(gmac, "local-mac-address", NULL);
if (addr == NULL) {
printk(KERN_ERR "Can't get mac-address for GMAC %s\n",
gmac->full_name);
return;
}
if (dummy_buf == NULL) {
dummy_buf = kmalloc(DUMMY_BUF_LEN, GFP_KERNEL);
if (dummy_buf == NULL) {
printk(KERN_ERR "GMAC: failed to allocated dummy buffer\n");
return;
}
}
tx_descpage = get_free_page(GFP_KERNEL);
if (tx_descpage == 0) {
printk(KERN_ERR "GMAC: can't get a page for tx descriptors\n");
return;
}
rx_descpage = get_free_page(GFP_KERNEL);
if (rx_descpage == 0) {
printk(KERN_ERR "GMAC: can't get a page for rx descriptors\n");
goto out_txdesc;
}
dev = init_etherdev(NULL, sizeof(struct gmac));
if (!dev) {
printk(KERN_ERR "GMAC: init_etherdev failed, out of memory\n");
goto out_rxdesc;
}
SET_MODULE_OWNER(dev);
gm = dev->priv;
gm->of_node = gmac;
if (!request_OF_resource(gmac, 0, " (gmac)")) {
printk(KERN_ERR "GMAC: can't request IO resource !\n");
goto out_unreg;
}
dev->base_addr = gmac->addrs[0].address;
gm->regs = (volatile unsigned int *)
ioremap(gmac->addrs[0].address, 0x10000);
if (!gm->regs) {
printk(KERN_ERR "GMAC: unable to map I/O registers\n");
goto out_unreg;
}
dev->irq = gmac->intrs[0].line;
gm->dev = dev;
spin_lock_init(&gm->lock);
if (pci_device_from_OF_node(gmac, &gm->pci_bus, &gm->pci_devfn)) {
gm->pci_bus = gm->pci_devfn = 0xff;
printk(KERN_ERR "Can't locate GMAC PCI entry\n");
}
printk(KERN_INFO "%s: GMAC at", dev->name);
for (i = 0; i < 6; ++i) {
dev->dev_addr[i] = addr[i];
printk("%c%.2x", (i? ':': ' '), addr[i]);
}
printk(", driver " GMAC_VERSION "\n");
gm->tx_desc_page = tx_descpage;
gm->rx_desc_page = rx_descpage;
gm->rxring = (volatile struct gmac_dma_desc *) rx_descpage;
gm->txring = (volatile struct gmac_dma_desc *) tx_descpage;
gm->phy_addr = 0;
gm->opened = 0;
gm->sleeping = 0;
dev->open = gmac_open;
dev->stop = gmac_close;
dev->hard_start_xmit = gmac_xmit_start;
dev->get_stats = gmac_stats;
dev->set_multicast_list = &gmac_set_multicast;
dev->tx_timeout = &gmac_tx_timeout;
dev->watchdog_timeo = 5*HZ;
ether_setup(dev);
gm->next_gmac = gmacs;
gmacs = dev;
return;
out_unreg:
unregister_netdev(dev);
if (gm->of_node)
release_OF_resource(gm->of_node, 0);
kfree(dev);
out_rxdesc:
free_page(rx_descpage);
out_txdesc:
free_page(tx_descpage);
}
MODULE_AUTHOR("Paul Mackerras/Ben Herrenschmidt");
MODULE_DESCRIPTION("PowerMac GMAC driver.");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;
static void __exit gmac_cleanup_module(void)
{
struct gmac *gm;
struct net_device *dev;
#ifdef CONFIG_PMAC_PBOOK
if (gmacs)
pmu_unregister_sleep_notifier(&gmac_sleep_notifier);
#endif
while ((dev = gmacs) != NULL) {
gm = (struct gmac *) dev->priv;
unregister_netdev(dev);
iounmap((void *) gm->regs);
free_page(gm->tx_desc_page);
free_page(gm->rx_desc_page);
release_OF_resource(gm->of_node, 0);
gmacs = gm->next_gmac;
kfree(dev);
}
if (dummy_buf != NULL) {
kfree(dummy_buf);
dummy_buf = NULL;
}
}
module_init(gmac_probe);
module_exit(gmac_cleanup_module);
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