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u-boot/drivers/net/lan91c96.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

797 lines
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// SPDX-License-Identifier: GPL-2.0+
/*------------------------------------------------------------------------
* 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)
*
* 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_env_get_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_env_set_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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