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Jetpack/u-boot/drivers/net/lan91c96.c

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/*------------------------------------------------------------------------
* lan91c96.c
* This is a driver for SMSC's LAN91C96 single-chip Ethernet device, based
* on the SMC91111 driver from U-Boot.
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Rolf Offermanns <rof@sysgo.de>
*
* Copyright (C) 2001 Standard Microsystems Corporation (SMSC)
* Developed by Simple Network Magic Corporation (SNMC)
* Copyright (C) 1996 by Erik Stahlman (ES)
*
* SPDX-License-Identifier: GPL-2.0+
*
* Information contained in this file was obtained from the LAN91C96
* manual from SMC. To get a copy, if you really want one, you can find
* information under www.smsc.com.
*
* "Features" of the SMC chip:
* 6144 byte packet memory. ( for the 91C96 )
* EEPROM for configuration
* AUI/TP selection ( mine has 10Base2/10BaseT select )
*
* Arguments:
* io = for the base address
* irq = for the IRQ
*
* author:
* Erik Stahlman ( erik@vt.edu )
* Daris A Nevil ( dnevil@snmc.com )
*
*
* Hardware multicast code from Peter Cammaert ( pc@denkart.be )
*
* Sources:
* o SMSC LAN91C96 databook (www.smsc.com)
* o smc91111.c (u-boot driver)
* o smc9194.c (linux kernel driver)
* o lan91c96.c (Intel Diagnostic Manager driver)
*
* History:
* 04/30/03 Mathijs Haarman Modified smc91111.c (u-boot version)
* for lan91c96
*---------------------------------------------------------------------------
*/
#include <common.h>
#include <command.h>
#include <malloc.h>
#include "lan91c96.h"
#include <net.h>
#include <linux/compiler.h>
/*------------------------------------------------------------------------
*
* Configuration options, for the experienced user to change.
*
-------------------------------------------------------------------------*/
/* Use power-down feature of the chip */
#define POWER_DOWN 0
/*
* Wait time for memory to be free. This probably shouldn't be
* tuned that much, as waiting for this means nothing else happens
* in the system
*/
#define MEMORY_WAIT_TIME 16
#define SMC_DEBUG 0
#if (SMC_DEBUG > 2 )
#define PRINTK3(args...) printf(args)
#else
#define PRINTK3(args...)
#endif
#if SMC_DEBUG > 1
#define PRINTK2(args...) printf(args)
#else
#define PRINTK2(args...)
#endif
#ifdef SMC_DEBUG
#define PRINTK(args...) printf(args)
#else
#define PRINTK(args...)
#endif
/*------------------------------------------------------------------------
*
* The internal workings of the driver. If you are changing anything
* here with the SMC stuff, you should have the datasheet and know
* what you are doing.
*
*------------------------------------------------------------------------
*/
#define DRIVER_NAME "LAN91C96"
#define SMC_ALLOC_MAX_TRY 5
#define SMC_TX_TIMEOUT 30
#define ETH_ZLEN 60
#ifdef CONFIG_LAN91C96_USE_32_BIT
#define USE_32_BIT 1
#else
#undef USE_32_BIT
#endif
/* See if a MAC address is defined in the current environment. If so use it. If not
. print a warning and set the environment and other globals with the default.
. If an EEPROM is present it really should be consulted.
*/
static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev);
static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac);
/* ------------------------------------------------------------
* Internal routines
* ------------------------------------------------------------
*/
static unsigned char smc_mac_addr[] = { 0xc0, 0x00, 0x00, 0x1b, 0x62, 0x9c };
/*
* This function must be called before smc_open() if you want to override
* the default mac address.
*/
static void smc_set_mac_addr(const unsigned char *addr)
{
int i;
for (i = 0; i < sizeof (smc_mac_addr); i++) {
smc_mac_addr[i] = addr[i];
}
}
/***********************************************
* Show available memory *
***********************************************/
void dump_memory_info(struct eth_device *dev)
{
__maybe_unused word mem_info;
word old_bank;
old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT) & 0xF;
SMC_SELECT_BANK(dev, 0);
mem_info = SMC_inw(dev, LAN91C96_MIR);
PRINTK2 ("Memory: %4d available\n", (mem_info >> 8) * 2048);
SMC_SELECT_BANK(dev, old_bank);
}
/*
* A rather simple routine to print out a packet for debugging purposes.
*/
#if SMC_DEBUG > 2
static void print_packet (byte *, int);
#endif
static int poll4int (struct eth_device *dev, byte mask, int timeout)
{
int tmo = get_timer (0) + timeout * CONFIG_SYS_HZ;
int is_timeout = 0;
word old_bank = SMC_inw(dev, LAN91C96_BANK_SELECT);
PRINTK2 ("Polling...\n");
SMC_SELECT_BANK(dev, 2);
while ((SMC_inw(dev, LAN91C96_INT_STATS) & mask) == 0) {
if (get_timer (0) >= tmo) {
is_timeout = 1;
break;
}
}
/* restore old bank selection */
SMC_SELECT_BANK(dev, old_bank);
if (is_timeout)
return 1;
else
return 0;
}
/*
* Function: smc_reset
* Purpose:
* This sets the SMC91111 chip to its normal state, hopefully from whatever
* mess that any other DOS driver has put it in.
*
* Maybe I should reset more registers to defaults in here? SOFTRST should
* do that for me.
*
* Method:
* 1. send a SOFT RESET
* 2. wait for it to finish
* 3. enable autorelease mode
* 4. reset the memory management unit
* 5. clear all interrupts
*
*/
static void smc_reset(struct eth_device *dev)
{
PRINTK2("%s:smc_reset\n", dev->name);
/* This resets the registers mostly to defaults, but doesn't
affect EEPROM. That seems unnecessary */
SMC_SELECT_BANK(dev, 0);
SMC_outw(dev, LAN91C96_RCR_SOFT_RST, LAN91C96_RCR);
udelay (10);
/* Disable transmit and receive functionality */
SMC_outw(dev, 0, LAN91C96_RCR);
SMC_outw(dev, 0, LAN91C96_TCR);
/* set the control register */
SMC_SELECT_BANK(dev, 1);
SMC_outw(dev, SMC_inw(dev, LAN91C96_CONTROL) | LAN91C96_CTR_BIT_8,
LAN91C96_CONTROL);
/* Disable all interrupts */
SMC_outb(dev, 0, LAN91C96_INT_MASK);
}
/*
* Function: smc_enable
* Purpose: let the chip talk to the outside work
* Method:
* 1. Initialize the Memory Configuration Register
* 2. Enable the transmitter
* 3. Enable the receiver
*/
static void smc_enable(struct eth_device *dev)
{
PRINTK2("%s:smc_enable\n", dev->name);
SMC_SELECT_BANK(dev, 0);
/* Initialize the Memory Configuration Register. See page
49 of the LAN91C96 data sheet for details. */
SMC_outw(dev, LAN91C96_MCR_TRANSMIT_PAGES, LAN91C96_MCR);
/* Initialize the Transmit Control Register */
SMC_outw(dev, LAN91C96_TCR_TXENA, LAN91C96_TCR);
/* Initialize the Receive Control Register
* FIXME:
* The promiscuous bit set because I could not receive ARP reply
* packets from the server when I send a ARP request. It only works
* when I set the promiscuous bit
*/
SMC_outw(dev, LAN91C96_RCR_RXEN | LAN91C96_RCR_PRMS, LAN91C96_RCR);
}
/*
* Function: smc_shutdown
* Purpose: closes down the SMC91xxx chip.
* Method:
* 1. zero the interrupt mask
* 2. clear the enable receive flag
* 3. clear the enable xmit flags
*
* TODO:
* (1) maybe utilize power down mode.
* Why not yet? Because while the chip will go into power down mode,
* the manual says that it will wake up in response to any I/O requests
* in the register space. Empirical results do not show this working.
*/
static void smc_shutdown(struct eth_device *dev)
{
PRINTK2("%s:smc_shutdown\n", dev->name);
/* no more interrupts for me */
SMC_SELECT_BANK(dev, 2);
SMC_outb(dev, 0, LAN91C96_INT_MASK);
/* and tell the card to stay away from that nasty outside world */
SMC_SELECT_BANK(dev, 0);
SMC_outb(dev, 0, LAN91C96_RCR);
SMC_outb(dev, 0, LAN91C96_TCR);
}
/*
* Function: smc_hardware_send_packet(struct net_device * )
* Purpose:
* This sends the actual packet to the SMC9xxx chip.
*
* Algorithm:
* First, see if a saved_skb is available.
* ( this should NOT be called if there is no 'saved_skb'
* Now, find the packet number that the chip allocated
* Point the data pointers at it in memory
* Set the length word in the chip's memory
* Dump the packet to chip memory
* Check if a last byte is needed ( odd length packet )
* if so, set the control flag right
* Tell the card to send it
* Enable the transmit interrupt, so I know if it failed
* Free the kernel data if I actually sent it.
*/
static int smc_send_packet(struct eth_device *dev, void *packet,
int packet_length)
{
byte packet_no;
byte *buf;
int length;
int numPages;
int try = 0;
int time_out;
byte status;
PRINTK3("%s:smc_hardware_send_packet\n", dev->name);
length = ETH_ZLEN < packet_length ? packet_length : ETH_ZLEN;
/* allocate memory
** The MMU wants the number of pages to be the number of 256 bytes
** 'pages', minus 1 ( since a packet can't ever have 0 pages :) )
**
** The 91C111 ignores the size bits, but the code is left intact
** for backwards and future compatibility.
**
** Pkt size for allocating is data length +6 (for additional status
** words, length and ctl!)
**
** If odd size then last byte is included in this header.
*/
numPages = ((length & 0xfffe) + 6);
numPages >>= 8; /* Divide by 256 */
if (numPages > 7) {
printf("%s: Far too big packet error. \n", dev->name);
return 0;
}
/* now, try to allocate the memory */
SMC_SELECT_BANK(dev, 2);
SMC_outw(dev, LAN91C96_MMUCR_ALLOC_TX | numPages, LAN91C96_MMU);
again:
try++;
time_out = MEMORY_WAIT_TIME;
do {
status = SMC_inb(dev, LAN91C96_INT_STATS);
if (status & LAN91C96_IST_ALLOC_INT) {
SMC_outb(dev, LAN91C96_IST_ALLOC_INT,
LAN91C96_INT_STATS);
break;
}
} while (--time_out);
if (!time_out) {
PRINTK2 ("%s: memory allocation, try %d failed ...\n",
dev->name, try);
if (try < SMC_ALLOC_MAX_TRY)
goto again;
else
return 0;
}
PRINTK2 ("%s: memory allocation, try %d succeeded ...\n",
dev->name, try);
/* I can send the packet now.. */
buf = (byte *) packet;
/* If I get here, I _know_ there is a packet slot waiting for me */
packet_no = SMC_inb(dev, LAN91C96_ARR);
if (packet_no & LAN91C96_ARR_FAILED) {
/* or isn't there? BAD CHIP! */
printf("%s: Memory allocation failed. \n", dev->name);
return 0;
}
/* we have a packet address, so tell the card to use it */
SMC_outb(dev, packet_no, LAN91C96_PNR);
/* point to the beginning of the packet */
SMC_outw(dev, LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
PRINTK3("%s: Trying to xmit packet of length %x\n",
dev->name, length);
#if SMC_DEBUG > 2
printf ("Transmitting Packet\n");
print_packet (buf, length);
#endif
/* send the packet length ( +6 for status, length and ctl byte )
and the status word ( set to zeros ) */
#ifdef USE_32_BIT
SMC_outl(dev, (length + 6) << 16, LAN91C96_DATA_HIGH);
#else
SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
/* send the packet length ( +6 for status words, length, and ctl */
SMC_outw(dev, (length + 6), LAN91C96_DATA_HIGH);
#endif /* USE_32_BIT */
/* send the actual data
* I _think_ it's faster to send the longs first, and then
* mop up by sending the last word. It depends heavily
* on alignment, at least on the 486. Maybe it would be
* a good idea to check which is optimal? But that could take
* almost as much time as is saved?
*/
#ifdef USE_32_BIT
SMC_outsl(dev, LAN91C96_DATA_HIGH, buf, length >> 2);
if (length & 0x2)
SMC_outw(dev, *((word *) (buf + (length & 0xFFFFFFFC))),
LAN91C96_DATA_HIGH);
#else
SMC_outsw(dev, LAN91C96_DATA_HIGH, buf, (length) >> 1);
#endif /* USE_32_BIT */
/* Send the last byte, if there is one. */
if ((length & 1) == 0) {
SMC_outw(dev, 0, LAN91C96_DATA_HIGH);
} else {
SMC_outw(dev, buf[length - 1] | 0x2000, LAN91C96_DATA_HIGH);
}
/* and let the chipset deal with it */
SMC_outw(dev, LAN91C96_MMUCR_ENQUEUE, LAN91C96_MMU);
/* poll for TX INT */
if (poll4int (dev, LAN91C96_MSK_TX_INT, SMC_TX_TIMEOUT)) {
/* sending failed */
PRINTK2("%s: TX timeout, sending failed...\n", dev->name);
/* release packet */
SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
/* wait for MMU getting ready (low) */
while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
udelay (10);
PRINTK2("MMU ready\n");
return 0;
} else {
/* ack. int */
SMC_outw(dev, LAN91C96_IST_TX_INT, LAN91C96_INT_STATS);
PRINTK2("%s: Sent packet of length %d \n", dev->name, length);
/* release packet */
SMC_outw(dev, LAN91C96_MMUCR_RELEASE_TX, LAN91C96_MMU);
/* wait for MMU getting ready (low) */
while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
udelay (10);
PRINTK2 ("MMU ready\n");
}
return length;
}
/*
* Open and Initialize the board
*
* Set up everything, reset the card, etc ..
*
*/
static int smc_open(bd_t *bd, struct eth_device *dev)
{
int i, err; /* used to set hw ethernet address */
PRINTK2("%s:smc_open\n", dev->name);
/* reset the hardware */
smc_reset(dev);
smc_enable(dev);
SMC_SELECT_BANK(dev, 1);
/* set smc_mac_addr, and sync it with u-boot globals */
err = smc_get_ethaddr(bd, dev);
if (err < 0)
return -1;
#ifdef USE_32_BIT
for (i = 0; i < 6; i += 2) {
word address;
address = smc_mac_addr[i + 1] << 8;
address |= smc_mac_addr[i];
SMC_outw(dev, address, LAN91C96_IA0 + i);
}
#else
for (i = 0; i < 6; i++)
SMC_outb(dev, smc_mac_addr[i], LAN91C96_IA0 + i);
#endif
return 0;
}
/*-------------------------------------------------------------
*
* smc_rcv - receive a packet from the card
*
* There is ( at least ) a packet waiting to be read from
* chip-memory.
*
* o Read the status
* o If an error, record it
* o otherwise, read in the packet
*-------------------------------------------------------------
*/
static int smc_rcv(struct eth_device *dev)
{
int packet_number;
word status;
word packet_length;
int is_error = 0;
#ifdef USE_32_BIT
dword stat_len;
#endif
SMC_SELECT_BANK(dev, 2);
packet_number = SMC_inw(dev, LAN91C96_FIFO);
if (packet_number & LAN91C96_FIFO_RXEMPTY) {
return 0;
}
PRINTK3("%s:smc_rcv\n", dev->name);
/* start reading from the start of the packet */
SMC_outw(dev, LAN91C96_PTR_READ | LAN91C96_PTR_RCV |
LAN91C96_PTR_AUTO_INCR, LAN91C96_POINTER);
/* First two words are status and packet_length */
#ifdef USE_32_BIT
stat_len = SMC_inl(dev, LAN91C96_DATA_HIGH);
status = stat_len & 0xffff;
packet_length = stat_len >> 16;
#else
status = SMC_inw(dev, LAN91C96_DATA_HIGH);
packet_length = SMC_inw(dev, LAN91C96_DATA_HIGH);
#endif
packet_length &= 0x07ff; /* mask off top bits */
PRINTK2 ("RCV: STATUS %4x LENGTH %4x\n", status, packet_length);
if (!(status & FRAME_FILTER)) {
/* Adjust for having already read the first two words */
packet_length -= 4; /*4; */
/* set odd length for bug in LAN91C111, */
/* which never sets RS_ODDFRAME */
/* TODO ? */
#ifdef USE_32_BIT
PRINTK3 (" Reading %d dwords (and %d bytes) \n",
packet_length >> 2, packet_length & 3);
/* QUESTION: Like in the TX routine, do I want
to send the DWORDs or the bytes first, or some
mixture. A mixture might improve already slow PIO
performance */
SMC_insl(dev, LAN91C96_DATA_HIGH, net_rx_packets[0],
packet_length >> 2);
/* read the left over bytes */
if (packet_length & 3) {
int i;
byte *tail = (byte *)(net_rx_packets[0] +
(packet_length & ~3));
dword leftover = SMC_inl(dev, LAN91C96_DATA_HIGH);
for (i = 0; i < (packet_length & 3); i++)
*tail++ = (byte) (leftover >> (8 * i)) & 0xff;
}
#else
PRINTK3(" Reading %d words and %d byte(s)\n",
(packet_length >> 1), packet_length & 1);
SMC_insw(dev, LAN91C96_DATA_HIGH, net_rx_packets[0],
packet_length >> 1);
#endif /* USE_32_BIT */
#if SMC_DEBUG > 2
printf ("Receiving Packet\n");
print_packet((byte *)net_rx_packets[0], packet_length);
#endif
} else {
/* error ... */
/* TODO ? */
is_error = 1;
}
while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
udelay (1); /* Wait until not busy */
/* error or good, tell the card to get rid of this packet */
SMC_outw(dev, LAN91C96_MMUCR_RELEASE_RX, LAN91C96_MMU);
while (SMC_inw(dev, LAN91C96_MMU) & LAN91C96_MMUCR_NO_BUSY)
udelay (1); /* Wait until not busy */
if (!is_error) {
/* Pass the packet up to the protocol layers. */
net_process_received_packet(net_rx_packets[0], packet_length);
return packet_length;
} else {
return 0;
}
}
/*----------------------------------------------------
* smc_close
*
* this makes the board clean up everything that it can
* and not talk to the outside world. Caused by
* an 'ifconfig ethX down'
*
-----------------------------------------------------*/
static int smc_close(struct eth_device *dev)
{
PRINTK2("%s:smc_close\n", dev->name);
/* clear everything */
smc_shutdown(dev);
return 0;
}
#if SMC_DEBUG > 2
static void print_packet(byte *buf, int length)
{
#if 0
int i;
int remainder;
int lines;
printf ("Packet of length %d \n", length);
lines = length / 16;
remainder = length % 16;
for (i = 0; i < lines; i++) {
int cur;
for (cur = 0; cur < 8; cur++) {
byte a, b;
a = *(buf++);
b = *(buf++);
printf ("%02x%02x ", a, b);
}
printf ("\n");
}
for (i = 0; i < remainder / 2; i++) {
byte a, b;
a = *(buf++);
b = *(buf++);
printf ("%02x%02x ", a, b);
}
printf ("\n");
#endif /* 0 */
}
#endif /* SMC_DEBUG > 2 */
static int lan91c96_init(struct eth_device *dev, bd_t *bd)
{
return smc_open(bd, dev);
}
static void lan91c96_halt(struct eth_device *dev)
{
smc_close(dev);
}
static int lan91c96_recv(struct eth_device *dev)
{
return smc_rcv(dev);
}
static int lan91c96_send(struct eth_device *dev, void *packet,
int length)
{
return smc_send_packet(dev, packet, length);
}
/* smc_get_ethaddr
*
* This checks both the environment and the ROM for an ethernet address. If
* found, the environment takes precedence.
*/
static int smc_get_ethaddr(bd_t *bd, struct eth_device *dev)
{
uchar v_mac[6];
if (!eth_getenv_enetaddr("ethaddr", v_mac)) {
/* get ROM mac value if any */
if (!get_rom_mac(dev, v_mac)) {
printf("\n*** ERROR: ethaddr is NOT set !!\n");
return -1;
}
eth_setenv_enetaddr("ethaddr", v_mac);
}
smc_set_mac_addr(v_mac); /* use old function to update smc default */
PRINTK("Using MAC Address %pM\n", v_mac);
return 0;
}
/*
* get_rom_mac()
* Note, this has omly been tested for the OMAP730 P2.
*/
static int get_rom_mac(struct eth_device *dev, unsigned char *v_rom_mac)
{
int i;
SMC_SELECT_BANK(dev, 1);
for (i=0; i<6; i++)
{
v_rom_mac[i] = SMC_inb(dev, LAN91C96_IA0 + i);
}
return (1);
}
/* Structure to detect the device IDs */
struct id_type {
u8 id;
char *name;
};
static struct id_type supported_chips[] = {
{0, ""}, /* Dummy entry to prevent id check failure */
{9, "LAN91C110"},
{8, "LAN91C100FD"},
{7, "LAN91C100"},
{5, "LAN91C95"},
{4, "LAN91C94/96"},
{3, "LAN91C90/92"},
};
/* lan91c96_detect_chip
* See:
* http://www.embeddedsys.com/subpages/resources/images/documents/LAN91C96_datasheet.pdf
* page 71 - that is the closest we get to detect this device
*/
static int lan91c96_detect_chip(struct eth_device *dev)
{
u8 chip_id;
int r;
SMC_SELECT_BANK(dev, 3);
chip_id = (SMC_inw(dev, 0xA) & LAN91C96_REV_CHIPID) >> 4;
SMC_SELECT_BANK(dev, 0);
for (r = 0; r < ARRAY_SIZE(supported_chips); r++)
if (chip_id == supported_chips[r].id)
return r;
return 0;
}
int lan91c96_initialize(u8 dev_num, int base_addr)
{
struct eth_device *dev;
int r = 0;
dev = malloc(sizeof(*dev));
if (!dev) {
return 0;
}
memset(dev, 0, sizeof(*dev));
dev->iobase = base_addr;
/* Try to detect chip. Will fail if not present. */
r = lan91c96_detect_chip(dev);
if (!r) {
free(dev);
return 0;
}
get_rom_mac(dev, dev->enetaddr);
dev->init = lan91c96_init;
dev->halt = lan91c96_halt;
dev->send = lan91c96_send;
dev->recv = lan91c96_recv;
sprintf(dev->name, "%s-%hu", supported_chips[r].name, dev_num);
eth_register(dev);
return 0;
}
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