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!
diff --git a/drivers/net/sk_g16.c b/drivers/net/sk_g16.c
new file mode 100644
index 0000000..134ae0e
--- /dev/null
+++ b/drivers/net/sk_g16.c
@@ -0,0 +1,2066 @@
+/*-
+ * Copyright (C) 1994 by PJD Weichmann & SWS Bern, Switzerland
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * Module : sk_g16.c
+ *
+ * Version : $Revision: 1.1 $
+ *
+ * Author : Patrick J.D. Weichmann
+ *
+ * Date Created : 94/05/26
+ * Last Updated : $Date: 1994/06/30 16:25:15 $
+ *
+ * Description : Schneider & Koch G16 Ethernet Device Driver for
+ * Linux Kernel >= 1.1.22
+ * Update History :
+ * Paul Gortmaker, 03/97: Fix for v2.1.x to use read{b,w}
+ * write{b,w} and memcpy -> memcpy_{to,from}io
+ *
+ * Jeff Garzik, 06/2000, Modularize
+ *
+-*/
+
+static const char rcsid[] = "$Id: sk_g16.c,v 1.1 1994/06/30 16:25:15 root Exp $";
+
+/*
+ * The Schneider & Koch (SK) G16 Network device driver is based
+ * on the 'ni6510' driver from Michael Hipp which can be found at
+ * ftp://sunsite.unc.edu/pub/Linux/system/Network/drivers/nidrivers.tar.gz
+ *
+ * Sources: 1) ni6510.c by M. Hipp
+ * 2) depca.c by D.C. Davies
+ * 3) skeleton.c by D. Becker
+ * 4) Am7990 Local Area Network Controller for Ethernet (LANCE),
+ * AMD, Pub. #05698, June 1989
+ *
+ * Many Thanks for helping me to get things working to:
+ *
+ * A. Cox (A.Cox@swansea.ac.uk)
+ * M. Hipp (mhipp@student.uni-tuebingen.de)
+ * R. Bolz (Schneider & Koch, Germany)
+ *
+ * To Do:
+ * - Support of SK_G8 and other SK Network Cards.
+ * - Autoset memory mapped RAM. Check for free memory and then
+ * configure RAM correctly.
+ * - SK_close should really set card in to initial state.
+ * - Test if IRQ 3 is not switched off. Use autoirq() functionality.
+ * (as in /drivers/net/skeleton.c)
+ * - Implement Multicast addressing. At minimum something like
+ * in depca.c.
+ * - Redo the statistics part.
+ * - Try to find out if the board is in 8 Bit or 16 Bit slot.
+ * If in 8 Bit mode don't use IRQ 11.
+ * - (Try to make it slightly faster.)
+ * - Power management support
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/fcntl.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+
+#include "sk_g16.h"
+
+/*
+ * Schneider & Koch Card Definitions
+ * =================================
+ */
+
+#define SK_NAME "SK_G16"
+
+/*
+ * SK_G16 Configuration
+ * --------------------
+ */
+
+/*
+ * Abbreviations
+ * -------------
+ *
+ * RAM - used for the 16KB shared memory
+ * Boot_ROM, ROM - are used for referencing the BootEPROM
+ *
+ * SK_BOOT_ROM and SK_ADDR are symbolic constants used to configure
+ * the behaviour of the driver and the SK_G16.
+ *
+ * ! See sk_g16.install on how to install and configure the driver !
+ *
+ * SK_BOOT_ROM defines if the Boot_ROM should be switched off or not.
+ *
+ * SK_ADDR defines the address where the RAM will be mapped into the real
+ * host memory.
+ * valid addresses are from 0xa0000 to 0xfc000 in 16Kbyte steps.
+ */
+
+#define SK_BOOT_ROM 1 /* 1=BootROM on 0=off */
+
+#define SK_ADDR 0xcc000
+
+/*
+ * In POS3 are bits A14-A19 of the address bus. These bits can be set
+ * to choose the RAM address. That's why we only can choose the RAM address
+ * in 16KB steps.
+ */
+
+#define POS_ADDR (rom_addr>>14) /* Do not change this line */
+
+/*
+ * SK_G16 I/O PORT's + IRQ's + Boot_ROM locations
+ * ----------------------------------------------
+ */
+
+/*
+ * As nearly every card has also SK_G16 a specified I/O Port region and
+ * only a few possible IRQ's.
+ * In the Installation Guide from Schneider & Koch is listed a possible
+ * Interrupt IRQ2. IRQ2 is always IRQ9 in boards with two cascaded interrupt
+ * controllers. So we use in SK_IRQS IRQ9.
+ */
+
+/* Don't touch any of the following #defines. */
+
+#define SK_IO_PORTS { 0x100, 0x180, 0x208, 0x220, 0x288, 0x320, 0x328, 0x390, 0 }
+
+#define SK_IRQS { 3, 5, 9, 11, 0 }
+
+#define SK_BOOT_ROM_LOCATIONS { 0xc0000, 0xc4000, 0xc8000, 0xcc000, 0xd0000, 0xd4000, 0xd8000, 0xdc000, 0 }
+
+#define SK_BOOT_ROM_ID { 0x55, 0xaa, 0x10, 0x50, 0x06, 0x33 }
+
+/*
+ * SK_G16 POS REGISTERS
+ * --------------------
+ */
+
+/*
+ * SK_G16 has a Programmable Option Select (POS) Register.
+ * The POS is composed of 8 separate registers (POS0-7) which
+ * are I/O mapped on an address set by the W1 switch.
+ *
+ */
+
+#define SK_POS_SIZE 8 /* 8 I/O Ports are used by SK_G16 */
+
+#define SK_POS0 ioaddr /* Card-ID Low (R) */
+#define SK_POS1 ioaddr+1 /* Card-ID High (R) */
+#define SK_POS2 ioaddr+2 /* Card-Enable, Boot-ROM Disable (RW) */
+#define SK_POS3 ioaddr+3 /* Base address of RAM */
+#define SK_POS4 ioaddr+4 /* IRQ */
+
+/* POS5 - POS7 are unused */
+
+/*
+ * SK_G16 MAC PREFIX
+ * -----------------
+ */
+
+/*
+ * Scheider & Koch manufacturer code (00:00:a5).
+ * This must be checked, that we are sure it is a SK card.
+ */
+
+#define SK_MAC0 0x00
+#define SK_MAC1 0x00
+#define SK_MAC2 0x5a
+
+/*
+ * SK_G16 ID
+ * ---------
+ */
+
+/*
+ * If POS0,POS1 contain the following ID, then we know
+ * at which I/O Port Address we are.
+ */
+
+#define SK_IDLOW 0xfd
+#define SK_IDHIGH 0x6a
+
+
+/*
+ * LANCE POS Bit definitions
+ * -------------------------
+ */
+
+#define SK_ROM_RAM_ON (POS2_CARD)
+#define SK_ROM_RAM_OFF (POS2_EPROM)
+#define SK_ROM_ON (inb(SK_POS2) & POS2_CARD)
+#define SK_ROM_OFF (inb(SK_POS2) | POS2_EPROM)
+#define SK_RAM_ON (inb(SK_POS2) | POS2_CARD)
+#define SK_RAM_OFF (inb(SK_POS2) & POS2_EPROM)
+
+#define POS2_CARD 0x0001 /* 1 = SK_G16 on 0 = off */
+#define POS2_EPROM 0x0002 /* 1 = Boot EPROM off 0 = on */
+
+/*
+ * SK_G16 Memory mapped Registers
+ * ------------------------------
+ *
+ */
+
+#define SK_IOREG (&board->ioreg) /* LANCE data registers. */
+#define SK_PORT (&board->port) /* Control, Status register */
+#define SK_IOCOM (&board->iocom) /* I/O Command */
+
+/*
+ * SK_G16 Status/Control Register bits
+ * -----------------------------------
+ *
+ * (C) Controlreg (S) Statusreg
+ */
+
+/*
+ * Register transfer: 0 = no transfer
+ * 1 = transferring data between LANCE and I/O reg
+ */
+#define SK_IORUN 0x20
+
+/*
+ * LANCE interrupt: 0 = LANCE interrupt occurred
+ * 1 = no LANCE interrupt occurred
+ */
+#define SK_IRQ 0x10
+
+#define SK_RESET 0x08 /* Reset SK_CARD: 0 = RESET 1 = normal */
+#define SK_RW 0x02 /* 0 = write to 1 = read from */
+#define SK_ADR 0x01 /* 0 = REG DataPort 1 = RAP Reg addr port */
+
+
+#define SK_RREG SK_RW /* Transferdirection to read from lance */
+#define SK_WREG 0 /* Transferdirection to write to lance */
+#define SK_RAP SK_ADR /* Destination Register RAP */
+#define SK_RDATA 0 /* Destination Register REG DataPort */
+
+/*
+ * SK_G16 I/O Command
+ * ------------------
+ */
+
+/*
+ * Any bitcombination sets the internal I/O bit (transfer will start)
+ * when written to I/O Command
+ */
+
+#define SK_DOIO 0x80 /* Do Transfer */
+
+/*
+ * LANCE RAP (Register Address Port).
+ * ---------------------------------
+ */
+
+/*
+ * The LANCE internal registers are selected through the RAP.
+ * The Registers are:
+ *
+ * CSR0 - Status and Control flags
+ * CSR1 - Low order bits of initialize block (bits 15:00)
+ * CSR2 - High order bits of initialize block (bits 07:00, 15:08 are reserved)
+ * CSR3 - Allows redefinition of the Bus Master Interface.
+ * This register must be set to 0x0002, which means BSWAP = 0,
+ * ACON = 1, BCON = 0;
+ *
+ */
+
+#define CSR0 0x00
+#define CSR1 0x01
+#define CSR2 0x02
+#define CSR3 0x03
+
+/*
+ * General Definitions
+ * ===================
+ */
+
+/*
+ * Set the number of Tx and Rx buffers, using Log_2(# buffers).
+ * We have 16KB RAM which can be accessed by the LANCE. In the
+ * memory are not only the buffers but also the ring descriptors and
+ * the initialize block.
+ * Don't change anything unless you really know what you do.
+ */
+
+#define LC_LOG_TX_BUFFERS 1 /* (2 == 2^^1) 2 Transmit buffers */
+#define LC_LOG_RX_BUFFERS 3 /* (8 == 2^^3) 8 Receive buffers */
+
+/* Descriptor ring sizes */
+
+#define TMDNUM (1 << (LC_LOG_TX_BUFFERS)) /* 2 Transmit descriptor rings */
+#define RMDNUM (1 << (LC_LOG_RX_BUFFERS)) /* 8 Receive Buffers */
+
+/* Define Mask for setting RMD, TMD length in the LANCE init_block */
+
+#define TMDNUMMASK (LC_LOG_TX_BUFFERS << 29)
+#define RMDNUMMASK (LC_LOG_RX_BUFFERS << 29)
+
+/*
+ * Data Buffer size is set to maximum packet length.
+ */
+
+#define PKT_BUF_SZ 1518
+
+/*
+ * The number of low I/O ports used by the ethercard.
+ */
+
+#define ETHERCARD_TOTAL_SIZE SK_POS_SIZE
+
+/*
+ * SK_DEBUG
+ *
+ * Here you can choose what level of debugging wanted.
+ *
+ * If SK_DEBUG and SK_DEBUG2 are undefined, then only the
+ * necessary messages will be printed.
+ *
+ * If SK_DEBUG is defined, there will be many debugging prints
+ * which can help to find some mistakes in configuration or even
+ * in the driver code.
+ *
+ * If SK_DEBUG2 is defined, many many messages will be printed
+ * which normally you don't need. I used this to check the interrupt
+ * routine.
+ *
+ * (If you define only SK_DEBUG2 then only the messages for
+ * checking interrupts will be printed!)
+ *
+ * Normal way of live is:
+ *
+ * For the whole thing get going let both symbolic constants
+ * undefined. If you face any problems and you know what's going
+ * on (you know something about the card and you can interpret some
+ * hex LANCE register output) then define SK_DEBUG
+ *
+ */
+
+#undef SK_DEBUG /* debugging */
+#undef SK_DEBUG2 /* debugging with more verbose report */
+
+#ifdef SK_DEBUG
+#define PRINTK(x) printk x
+#else
+#define PRINTK(x) /**/
+#endif
+
+#ifdef SK_DEBUG2
+#define PRINTK2(x) printk x
+#else
+#define PRINTK2(x) /**/
+#endif
+
+/*
+ * SK_G16 RAM
+ *
+ * The components are memory mapped and can be set in a region from
+ * 0x00000 through 0xfc000 in 16KB steps.
+ *
+ * The Network components are: dual ported RAM, Prom, I/O Reg, Status-,
+ * Controlregister and I/O Command.
+ *
+ * dual ported RAM: This is the only memory region which the LANCE chip
+ * has access to. From the Lance it is addressed from 0x0000 to
+ * 0x3fbf. The host accesses it normally.
+ *
+ * PROM: The PROM obtains the ETHERNET-MAC-Address. It is realised as a
+ * 8-Bit PROM, this means only the 16 even addresses are used of the
+ * 32 Byte Address region. Access to an odd address results in invalid
+ * data.
+ *
+ * LANCE I/O Reg: The I/O Reg is build of 4 single Registers, Low-Byte Write,
+ * Hi-Byte Write, Low-Byte Read, Hi-Byte Read.
+ * Transfer from or to the LANCE is always in 16Bit so Low and High
+ * registers are always relevant.
+ *
+ * The Data from the Readregister is not the data in the Writeregister!!
+ *
+ * Port: Status- and Controlregister.
+ * Two different registers which share the same address, Status is
+ * read-only, Control is write-only.
+ *
+ * I/O Command:
+ * Any bitcombination written in here starts the transmission between
+ * Host and LANCE.
+ */
+
+typedef struct
+{
+ unsigned char ram[0x3fc0]; /* 16KB dual ported ram */
+ unsigned char rom[0x0020]; /* 32Byte PROM containing 6Byte MAC */
+ unsigned char res1[0x0010]; /* reserved */
+ unsigned volatile short ioreg;/* LANCE I/O Register */
+ unsigned volatile char port; /* Statusregister and Controlregister */
+ unsigned char iocom; /* I/O Command Register */
+} SK_RAM;
+
+/* struct */
+
+/*
+ * This is the structure for the dual ported ram. We
+ * have exactly 16 320 Bytes. In here there must be:
+ *
+ * - Initialize Block (starting at a word boundary)
+ * - Receive and Transmit Descriptor Rings (quadword boundary)
+ * - Data Buffers (arbitrary boundary)
+ *
+ * This is because LANCE has on SK_G16 only access to the dual ported
+ * RAM and nowhere else.
+ */
+
+struct SK_ram
+{
+ struct init_block ib;
+ struct tmd tmde[TMDNUM];
+ struct rmd rmde[RMDNUM];
+ char tmdbuf[TMDNUM][PKT_BUF_SZ];
+ char rmdbuf[RMDNUM][PKT_BUF_SZ];
+};
+
+/*
+ * Structure where all necessary information is for ring buffer
+ * management and statistics.
+ */
+
+struct priv
+{
+ struct SK_ram *ram; /* dual ported ram structure */
+ struct rmd *rmdhead; /* start of receive ring descriptors */
+ struct tmd *tmdhead; /* start of transmit ring descriptors */
+ int rmdnum; /* actual used ring descriptor */
+ int tmdnum; /* actual transmit descriptor for transmitting data */
+ int tmdlast; /* last sent descriptor used for error handling, etc */
+ void *rmdbufs[RMDNUM]; /* pointer to the receive buffers */
+ void *tmdbufs[TMDNUM]; /* pointer to the transmit buffers */
+ struct net_device_stats stats; /* Device driver statistics */
+};
+
+/* global variable declaration */
+
+/* IRQ map used to reserve a IRQ (see SK_open()) */
+
+/* static variables */
+
+static SK_RAM *board; /* pointer to our memory mapped board components */
+static DEFINE_SPINLOCK(SK_lock);
+
+/* Macros */
+
+
+/* Function Prototypes */
+
+/*
+ * Device Driver functions
+ * -----------------------
+ * See for short explanation of each function its definitions header.
+ */
+
+static int SK_probe(struct net_device *dev, short ioaddr);
+
+static void SK_timeout(struct net_device *dev);
+static int SK_open(struct net_device *dev);
+static int SK_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t SK_interrupt(int irq, void *dev_id, struct pt_regs * regs);
+static void SK_rxintr(struct net_device *dev);
+static void SK_txintr(struct net_device *dev);
+static int SK_close(struct net_device *dev);
+
+static struct net_device_stats *SK_get_stats(struct net_device *dev);
+
+unsigned int SK_rom_addr(void);
+
+static void set_multicast_list(struct net_device *dev);
+
+/*
+ * LANCE Functions
+ * ---------------
+ */
+
+static int SK_lance_init(struct net_device *dev, unsigned short mode);
+void SK_reset_board(void);
+void SK_set_RAP(int reg_number);
+int SK_read_reg(int reg_number);
+int SK_rread_reg(void);
+void SK_write_reg(int reg_number, int value);
+
+/*
+ * Debugging functions
+ * -------------------
+ */
+
+void SK_print_pos(struct net_device *dev, char *text);
+void SK_print_dev(struct net_device *dev, char *text);
+void SK_print_ram(struct net_device *dev);
+
+
+/*-
+ * Function : SK_init
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/26
+ *
+ * Description : Check for a SK_G16 network adaptor and initialize it.
+ * This function gets called by dev_init which initializes
+ * all Network devices.
+ *
+ * Parameters : I : struct net_device *dev - structure preconfigured
+ * from Space.c
+ * Return Value : 0 = Driver Found and initialized
+ * Errors : ENODEV - no device found
+ * ENXIO - not probed
+ * Globals : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static int io; /* 0 == probe */
+
+/*
+ * Check for a network adaptor of this type, and return '0' if one exists.
+ * If dev->base_addr == 0, probe all likely locations.
+ * If dev->base_addr == 1, always return failure.
+ */
+
+struct net_device * __init SK_init(int unit)
+{
+ int *port, ports[] = SK_IO_PORTS; /* SK_G16 supported ports */
+ static unsigned version_printed;
+ struct net_device *dev = alloc_etherdev(sizeof(struct priv));
+ int err = -ENODEV;
+
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ if (unit >= 0) {
+ sprintf(dev->name, "eth%d", unit);
+ netdev_boot_setup_check(dev);
+ io = dev->base_addr;
+ }
+
+ if (version_printed++ == 0)
+ PRINTK(("%s: %s", SK_NAME, rcsid));
+
+ if (io > 0xff) { /* Check a single specified address */
+ err = -EBUSY;
+ /* Check if on specified address is a SK_G16 */
+ if (request_region(io, ETHERCARD_TOTAL_SIZE, "sk_g16")) {
+ err = SK_probe(dev, io);
+ if (!err)
+ goto got_it;
+ release_region(io, ETHERCARD_TOTAL_SIZE);
+ }
+ } else if (io > 0) { /* Don't probe at all */
+ err = -ENXIO;
+ } else {
+ /* Autoprobe base_addr */
+ for (port = &ports[0]; *port; port++) {
+ io = *port;
+
+ /* Check if I/O Port region is used by another board */
+ if (!request_region(io, ETHERCARD_TOTAL_SIZE, "sk_g16"))
+ continue; /* Try next Port address */
+
+ /* Check if at ioaddr is a SK_G16 */
+ if (SK_probe(dev, io) == 0)
+ goto got_it;
+
+ release_region(io, ETHERCARD_TOTAL_SIZE);
+ }
+ }
+err_out:
+ free_netdev(dev);
+ return ERR_PTR(err);
+
+got_it:
+ err = register_netdev(dev);
+ if (err) {
+ release_region(dev->base_addr, ETHERCARD_TOTAL_SIZE);
+ goto err_out;
+ }
+ return dev;
+
+} /* End of SK_init */
+
+
+MODULE_AUTHOR("Patrick J.D. Weichmann");
+MODULE_DESCRIPTION("Schneider & Koch G16 Ethernet Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "0 to probe common ports (unsafe), or the I/O base of the board");
+
+
+#ifdef MODULE
+
+static struct net_device *SK_dev;
+
+static int __init SK_init_module (void)
+{
+ SK_dev = SK_init(-1);
+ return IS_ERR(SK_dev) ? PTR_ERR(SK_dev) : 0;
+}
+
+static void __exit SK_cleanup_module (void)
+{
+ unregister_netdev(SK_dev);
+ release_region(SK_dev->base_addr, ETHERCARD_TOTAL_SIZE);
+ free_netdev(SK_dev);
+}
+
+module_init(SK_init_module);
+module_exit(SK_cleanup_module);
+#endif
+
+
+/*-
+ * Function : SK_probe
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/26
+ *
+ * Description : This function is called by SK_init and
+ * does the main part of initialization.
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device structure
+ * I : short ioaddr - I/O Port address where POS is.
+ * Return Value : 0 = Initialization done
+ * Errors : ENODEV - No SK_G16 found
+ * -1 - Configuration problem
+ * Globals : board - pointer to SK_RAM
+ * Update History :
+ * YY/MM/DD uid Description
+ * 94/06/30 pwe SK_ADDR now checked and at the correct place
+-*/
+
+int __init SK_probe(struct net_device *dev, short ioaddr)
+{
+ int i,j; /* Counters */
+ int sk_addr_flag = 0; /* SK ADDR correct? 1 - no, 0 - yes */
+ unsigned int rom_addr; /* used to store RAM address used for POS_ADDR */
+
+ struct priv *p = netdev_priv(dev); /* SK_G16 private structure */
+
+ if (inb(SK_POS0) != SK_IDLOW || inb(SK_POS1) != SK_IDHIGH)
+ return -ENODEV;
+ dev->base_addr = ioaddr;
+
+ if (SK_ADDR & 0x3fff || SK_ADDR < 0xa0000)
+ {
+
+ sk_addr_flag = 1;
+
+ /*
+ * Now here we could use a routine which searches for a free
+ * place in the ram and set SK_ADDR if found. TODO.
+ */
+ }
+
+ if (SK_BOOT_ROM) /* Shall we keep Boot_ROM on ? */
+ {
+ PRINTK(("## %s: SK_BOOT_ROM is set.\n", SK_NAME));
+
+ rom_addr = SK_rom_addr();
+
+ if (rom_addr == 0) /* No Boot_ROM found */
+ {
+ if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
+ {
+ printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+ dev->name, SK_ADDR);
+ return -1;
+ }
+
+ rom_addr = SK_ADDR; /* assign predefined address */
+
+ PRINTK(("## %s: NO Bootrom found \n", SK_NAME));
+
+ outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
+ outb(POS_ADDR, SK_POS3); /* Set RAM address */
+ outb(SK_RAM_ON, SK_POS2); /* enable RAM */
+ }
+ else if (rom_addr == SK_ADDR)
+ {
+ printk("%s: RAM + ROM are set to the same address %#08x\n"
+ " Check configuration. Now switching off Boot_ROM\n",
+ SK_NAME, rom_addr);
+
+ outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off*/
+ outb(POS_ADDR, SK_POS3); /* Set RAM address */
+ outb(SK_RAM_ON, SK_POS2); /* enable RAM */
+ }
+ else
+ {
+ PRINTK(("## %s: Found ROM at %#08x\n", SK_NAME, rom_addr));
+ PRINTK(("## %s: Keeping Boot_ROM on\n", SK_NAME));
+
+ if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
+ {
+ printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+ dev->name, SK_ADDR);
+ return -1;
+ }
+
+ rom_addr = SK_ADDR;
+
+ outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
+ outb(POS_ADDR, SK_POS3); /* Set RAM address */
+ outb(SK_ROM_RAM_ON, SK_POS2); /* RAM on, BOOT_ROM on */
+ }
+ }
+ else /* Don't keep Boot_ROM */
+ {
+ PRINTK(("## %s: SK_BOOT_ROM is not set.\n", SK_NAME));
+
+ if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
+ {
+ printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+ dev->name, SK_ADDR);
+ return -1;
+ }
+
+ rom_addr = SK_rom_addr(); /* Try to find a Boot_ROM */
+
+ /* IF we find a Boot_ROM disable it */
+
+ outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
+
+ /* We found a Boot_ROM and it's gone. Set RAM address on
+ * Boot_ROM address.
+ */
+
+ if (rom_addr)
+ {
+ printk("%s: We found Boot_ROM at %#08x. Now setting RAM on"
+ "that address\n", SK_NAME, rom_addr);
+
+ outb(POS_ADDR, SK_POS3); /* Set RAM on Boot_ROM address */
+ }
+ else /* We did not find a Boot_ROM, use predefined SK_ADDR for ram */
+ {
+ if (sk_addr_flag) /* No or Invalid SK_ADDR is defined */
+ {
+ printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
+ dev->name, SK_ADDR);
+ return -1;
+ }
+
+ rom_addr = SK_ADDR;
+
+ outb(POS_ADDR, SK_POS3); /* Set RAM address */
+ }
+ outb(SK_RAM_ON, SK_POS2); /* enable RAM */
+ }
+
+#ifdef SK_DEBUG
+ SK_print_pos(dev, "POS registers after ROM, RAM config");
+#endif
+
+ board = (SK_RAM *) isa_bus_to_virt(rom_addr);
+
+ /* Read in station address */
+ for (i = 0, j = 0; i < ETH_ALEN; i++, j+=2)
+ {
+ dev->dev_addr[i] = readb(board->rom+j);
+ }
+
+ /* Check for manufacturer code */
+ if (!(dev->dev_addr[0] == SK_MAC0 &&
+ dev->dev_addr[1] == SK_MAC1 &&
+ dev->dev_addr[2] == SK_MAC2) )
+ {
+ PRINTK(("## %s: We did not find SK_G16 at RAM location.\n",
+ SK_NAME));
+ return -ENODEV; /* NO SK_G16 found */
+ }
+
+ printk("%s: %s found at %#3x, HW addr: %#04x:%02x:%02x:%02x:%02x:%02x\n",
+ dev->name,
+ "Schneider & Koch Netcard",
+ (unsigned int) dev->base_addr,
+ dev->dev_addr[0],
+ dev->dev_addr[1],
+ dev->dev_addr[2],
+ dev->dev_addr[3],
+ dev->dev_addr[4],
+ dev->dev_addr[5]);
+
+ memset((char *) dev->priv, 0, sizeof(struct priv)); /* clear memory */
+
+ /* Assign our Device Driver functions */
+
+ dev->open = SK_open;
+ dev->stop = SK_close;
+ dev->hard_start_xmit = SK_send_packet;
+ dev->get_stats = SK_get_stats;
+ dev->set_multicast_list = set_multicast_list;
+ dev->tx_timeout = SK_timeout;
+ dev->watchdog_timeo = HZ/7;
+
+
+ dev->flags &= ~IFF_MULTICAST;
+
+ /* Initialize private structure */
+
+ p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
+ p->tmdhead = &(p->ram)->tmde[0]; /* Set TMD head */
+ p->rmdhead = &(p->ram)->rmde[0]; /* Set RMD head */
+
+ /* Initialize buffer pointers */
+
+ for (i = 0; i < TMDNUM; i++)
+ {
+ p->tmdbufs[i] = &(p->ram)->tmdbuf[i];
+ }
+
+ for (i = 0; i < RMDNUM; i++)
+ {
+ p->rmdbufs[i] = &(p->ram)->rmdbuf[i];
+ }
+
+#ifdef SK_DEBUG
+ SK_print_pos(dev, "End of SK_probe");
+ SK_print_ram(dev);
+#endif
+ return 0; /* Initialization done */
+} /* End of SK_probe() */
+
+
+/*-
+ * Function : SK_open
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/26
+ *
+ * Description : This function is called sometimes after booting
+ * when ifconfig program is run.
+ *
+ * This function requests an IRQ, sets the correct
+ * IRQ in the card. Then calls SK_lance_init() to
+ * init and start the LANCE chip. Then if everything is
+ * ok returns with 0 (OK), which means SK_G16 is now
+ * opened and operational.
+ *
+ * (Called by dev_open() /net/inet/dev.c)
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device structure
+ * Return Value : 0 - Device opened
+ * Errors : -EAGAIN - Open failed
+ * Side Effects : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static int SK_open(struct net_device *dev)
+{
+ int i = 0;
+ int irqval = 0;
+ int ioaddr = dev->base_addr;
+
+ int irqtab[] = SK_IRQS;
+
+ struct priv *p = netdev_priv(dev);
+
+ PRINTK(("## %s: At beginning of SK_open(). CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ if (dev->irq == 0) /* Autoirq */
+ {
+ i = 0;
+
+ /*
+ * Check if one IRQ out of SK_IRQS is free and install
+ * interrupt handler.
+ * Most done by request_irq().
+ * irqval: 0 - interrupt handler installed for IRQ irqtab[i]
+ * -EBUSY - interrupt busy
+ * -EINVAL - irq > 15 or handler = NULL
+ */
+
+ do
+ {
+ irqval = request_irq(irqtab[i], &SK_interrupt, 0, "sk_g16", dev);
+ i++;
+ } while (irqval && irqtab[i]);
+
+ if (irqval) /* We tried every possible IRQ but no success */
+ {
+ printk("%s: unable to get an IRQ\n", dev->name);
+ return -EAGAIN;
+ }
+
+ dev->irq = irqtab[--i];
+
+ outb(i<<2, SK_POS4); /* Set Card on probed IRQ */
+
+ }
+ else if (dev->irq == 2) /* IRQ2 is always IRQ9 */
+ {
+ if (request_irq(9, &SK_interrupt, 0, "sk_g16", dev))
+ {
+ printk("%s: unable to get IRQ 9\n", dev->name);
+ return -EAGAIN;
+ }
+ dev->irq = 9;
+
+ /*
+ * Now we set card on IRQ2.
+ * This can be confusing, but remember that IRQ2 on the network
+ * card is in reality IRQ9
+ */
+ outb(0x08, SK_POS4); /* set card to IRQ2 */
+
+ }
+ else /* Check IRQ as defined in Space.c */
+ {
+ int i = 0;
+
+ /* check if IRQ free and valid. Then install Interrupt handler */
+
+ if (request_irq(dev->irq, &SK_interrupt, 0, "sk_g16", dev))
+ {
+ printk("%s: unable to get selected IRQ\n", dev->name);
+ return -EAGAIN;
+ }
+
+ switch(dev->irq)
+ {
+ case 3: i = 0;
+ break;
+ case 5: i = 1;
+ break;
+ case 2: i = 2;
+ break;
+ case 11:i = 3;
+ break;
+ default:
+ printk("%s: Preselected IRQ %d is invalid for %s boards",
+ dev->name,
+ dev->irq,
+ SK_NAME);
+ return -EAGAIN;
+ }
+
+ outb(i<<2, SK_POS4); /* Set IRQ on card */
+ }
+
+ printk("%s: Schneider & Koch G16 at %#3x, IRQ %d, shared mem at %#08x\n",
+ dev->name, (unsigned int)dev->base_addr,
+ (int) dev->irq, (unsigned int) p->ram);
+
+ if (!(i = SK_lance_init(dev, 0))) /* LANCE init OK? */
+ {
+ netif_start_queue(dev);
+
+#ifdef SK_DEBUG
+
+ /*
+ * This debug block tries to stop LANCE,
+ * reinit LANCE with transmitter and receiver disabled,
+ * then stop again and reinit with NORMAL_MODE
+ */
+
+ printk("## %s: After lance init. CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0));
+ SK_write_reg(CSR0, CSR0_STOP);
+ printk("## %s: LANCE stopped. CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0));
+ SK_lance_init(dev, MODE_DTX | MODE_DRX);
+ printk("## %s: Reinit with DTX + DRX off. CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0));
+ SK_write_reg(CSR0, CSR0_STOP);
+ printk("## %s: LANCE stopped. CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0));
+ SK_lance_init(dev, MODE_NORMAL);
+ printk("## %s: LANCE back to normal mode. CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0));
+ SK_print_pos(dev, "POS regs before returning OK");
+
+#endif /* SK_DEBUG */
+
+ return 0; /* SK_open() is successful */
+ }
+ else /* LANCE init failed */
+ {
+
+ PRINTK(("## %s: LANCE init failed: CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ return -EAGAIN;
+ }
+
+} /* End of SK_open() */
+
+
+/*-
+ * Function : SK_lance_init
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/26
+ *
+ * Description : Reset LANCE chip, fill RMD, TMD structures with
+ * start values and Start LANCE.
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device structure
+ * I : int mode - put LANCE into "mode" see data-sheet for
+ * more info.
+ * Return Value : 0 - Init done
+ * Errors : -1 - Init failed
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static int SK_lance_init(struct net_device *dev, unsigned short mode)
+{
+ int i;
+ unsigned long flags;
+ struct priv *p = netdev_priv(dev);
+ struct tmd *tmdp;
+ struct rmd *rmdp;
+
+ PRINTK(("## %s: At beginning of LANCE init. CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ /* Reset LANCE */
+ SK_reset_board();
+
+ /* Initialize TMD's with start values */
+ p->tmdnum = 0; /* First descriptor for transmitting */
+ p->tmdlast = 0; /* First descriptor for reading stats */
+
+ for (i = 0; i < TMDNUM; i++) /* Init all TMD's */
+ {
+ tmdp = p->tmdhead + i;
+
+ writel((unsigned long) p->tmdbufs[i], tmdp->u.buffer); /* assign buffer */
+
+ /* Mark TMD as start and end of packet */
+ writeb(TX_STP | TX_ENP, &tmdp->u.s.status);
+ }
+
+
+ /* Initialize RMD's with start values */
+
+ p->rmdnum = 0; /* First RMD which will be used */
+
+ for (i = 0; i < RMDNUM; i++) /* Init all RMD's */
+ {
+ rmdp = p->rmdhead + i;
+
+
+ writel((unsigned long) p->rmdbufs[i], rmdp->u.buffer); /* assign buffer */
+
+ /*
+ * LANCE must be owner at beginning so that he can fill in
+ * receiving packets, set status and release RMD
+ */
+
+ writeb(RX_OWN, &rmdp->u.s.status);
+
+ writew(-PKT_BUF_SZ, &rmdp->blen); /* Buffer Size (two's complement) */
+
+ writeb(0, &rmdp->mlen); /* init message length */
+
+ }
+
+ /* Fill LANCE Initialize Block */
+
+ writew(mode, (&((p->ram)->ib.mode))); /* Set operation mode */
+
+ for (i = 0; i < ETH_ALEN; i++) /* Set physical address */
+ {
+ writeb(dev->dev_addr[i], (&((p->ram)->ib.paddr[i])));
+ }
+
+ for (i = 0; i < 8; i++) /* Set multicast, logical address */
+ {
+ writeb(0, (&((p->ram)->ib.laddr[i]))); /* We do not use logical addressing */
+ }
+
+ /* Set ring descriptor pointers and set number of descriptors */
+
+ writel((int)p->rmdhead | RMDNUMMASK, (&((p->ram)->ib.rdrp)));
+ writel((int)p->tmdhead | TMDNUMMASK, (&((p->ram)->ib.tdrp)));
+
+ /* Prepare LANCE Control and Status Registers */
+
+ spin_lock_irqsave(&SK_lock, flags);
+
+ SK_write_reg(CSR3, CSR3_ACON); /* Ale Control !!!THIS MUST BE SET!!!! */
+
+ /*
+ * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
+ * PC Memory locations.
+ *
+ * In structure SK_ram is defined that the first thing in ram
+ * is the initialization block. So his address is for LANCE always
+ * 0x0000
+ *
+ * CSR1 contains low order bits 15:0 of initialization block address
+ * CSR2 is built of:
+ * 7:0 High order bits 23:16 of initialization block address
+ * 15:8 reserved, must be 0
+ */
+
+ /* Set initialization block address (must be on word boundary) */
+ SK_write_reg(CSR1, 0); /* Set low order bits 15:0 */
+ SK_write_reg(CSR2, 0); /* Set high order bits 23:16 */
+
+
+ PRINTK(("## %s: After setting CSR1-3. CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ /* Initialize LANCE */
+
+ /*
+ * INIT = Initialize, when set, causes the LANCE to begin the
+ * initialization procedure and access the Init Block.
+ */
+
+ SK_write_reg(CSR0, CSR0_INIT);
+
+ spin_unlock_irqrestore(&SK_lock, flags);
+
+ /* Wait until LANCE finished initialization */
+
+ SK_set_RAP(CSR0); /* Register Address Pointer to CSR0 */
+
+ for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++)
+ ; /* Wait until init done or go ahead if problems (i>=100) */
+
+ if (i >= 100) /* Something is wrong ! */
+ {
+ printk("%s: can't init am7990, status: %04x "
+ "init_block: %#08x\n",
+ dev->name, (int) SK_read_reg(CSR0),
+ (unsigned int) &(p->ram)->ib);
+
+#ifdef SK_DEBUG
+ SK_print_pos(dev, "LANCE INIT failed");
+ SK_print_dev(dev,"Device Structure:");
+#endif
+
+ return -1; /* LANCE init failed */
+ }
+
+ PRINTK(("## %s: init done after %d ticks\n", SK_NAME, i));
+
+ /* Clear Initialize done, enable Interrupts, start LANCE */
+
+ SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);
+
+ PRINTK(("## %s: LANCE started. CSR0: %#06x\n", SK_NAME,
+ SK_read_reg(CSR0)));
+
+ return 0; /* LANCE is up and running */
+
+} /* End of SK_lance_init() */
+
+
+
+/*-
+ * Function : SK_send_packet
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/27
+ *
+ * Description : Writes an socket buffer into a transmit descriptor
+ * and starts transmission.
+ *
+ * Parameters : I : struct sk_buff *skb - packet to transfer
+ * I : struct net_device *dev - SK_G16 device structure
+ * Return Value : 0 - OK
+ * 1 - Could not transmit (dev_queue_xmit will queue it)
+ * and try to sent it later
+ * Globals : None
+ * Side Effects : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static void SK_timeout(struct net_device *dev)
+{
+ printk(KERN_WARNING "%s: xmitter timed out, try to restart!\n", dev->name);
+ SK_lance_init(dev, MODE_NORMAL); /* Reinit LANCE */
+ netif_wake_queue(dev); /* Clear Transmitter flag */
+ dev->trans_start = jiffies; /* Mark Start of transmission */
+}
+
+static int SK_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+ struct priv *p = netdev_priv(dev);
+ struct tmd *tmdp;
+ static char pad[64];
+
+ PRINTK2(("## %s: SK_send_packet() called, CSR0 %#04x.\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+
+ /*
+ * Block a timer-based transmit from overlapping.
+ * This means check if we are already in.
+ */
+
+ netif_stop_queue (dev);
+
+ {
+
+ /* Evaluate Packet length */
+ short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+
+ tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */
+
+ /* Fill in Transmit Message Descriptor */
+
+ /* Copy data into dual ported ram */
+
+ memcpy_toio((tmdp->u.buffer & 0x00ffffff), skb->data, skb->len);
+ if (len != skb->len)
+ memcpy_toio((tmdp->u.buffer & 0x00ffffff) + skb->len, pad, len-skb->len);
+
+ writew(-len, &tmdp->blen); /* set length to transmit */
+
+ /*
+ * Packet start and end is always set because we use the maximum
+ * packet length as buffer length.
+ * Relinquish ownership to LANCE
+ */
+
+ writeb(TX_OWN | TX_STP | TX_ENP, &tmdp->u.s.status);
+
+ /* Start Demand Transmission */
+ SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);
+
+ dev->trans_start = jiffies; /* Mark start of transmission */
+
+ /* Set pointer to next transmit buffer */
+ p->tmdnum++;
+ p->tmdnum &= TMDNUM-1;
+
+ /* Do we own the next transmit buffer ? */
+ if (! (readb(&((p->tmdhead + p->tmdnum)->u.s.status)) & TX_OWN) )
+ {
+ /*
+ * We own next buffer and are ready to transmit, so
+ * clear busy flag
+ */
+ netif_start_queue(dev);
+ }
+
+ p->stats.tx_bytes += skb->len;
+
+ }
+
+ dev_kfree_skb(skb);
+ return 0;
+} /* End of SK_send_packet */
+
+
+/*-
+ * Function : SK_interrupt
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/27
+ *
+ * Description : SK_G16 interrupt handler which checks for LANCE
+ * Errors, handles transmit and receive interrupts
+ *
+ * Parameters : I : int irq, void *dev_id, struct pt_regs * regs -
+ * Return Value : None
+ * Errors : None
+ * Globals : None
+ * Side Effects : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static irqreturn_t SK_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ int csr0;
+ struct net_device *dev = dev_id;
+ struct priv *p = netdev_priv(dev);
+
+
+ PRINTK2(("## %s: SK_interrupt(). status: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ if (dev == NULL)
+ {
+ printk("SK_interrupt(): IRQ %d for unknown device.\n", irq);
+ }
+
+ spin_lock (&SK_lock);
+
+ csr0 = SK_read_reg(CSR0); /* store register for checking */
+
+ /*
+ * Acknowledge all of the current interrupt sources, disable
+ * Interrupts (INEA = 0)
+ */
+
+ SK_write_reg(CSR0, csr0 & CSR0_CLRALL);
+
+ if (csr0 & CSR0_ERR) /* LANCE Error */
+ {
+ printk("%s: error: %04x\n", dev->name, csr0);
+
+ if (csr0 & CSR0_MISS) /* No place to store packet ? */
+ {
+ p->stats.rx_dropped++;
+ }
+ }
+
+ if (csr0 & CSR0_RINT) /* Receive Interrupt (packet arrived) */
+ {
+ SK_rxintr(dev);
+ }
+
+ if (csr0 & CSR0_TINT) /* Transmit interrupt (packet sent) */
+ {
+ SK_txintr(dev);
+ }
+
+ SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */
+
+ spin_unlock (&SK_lock);
+ return IRQ_HANDLED;
+} /* End of SK_interrupt() */
+
+
+/*-
+ * Function : SK_txintr
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/27
+ *
+ * Description : After sending a packet we check status, update
+ * statistics and relinquish ownership of transmit
+ * descriptor ring.
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device structure
+ * Return Value : None
+ * Errors : None
+ * Globals : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static void SK_txintr(struct net_device *dev)
+{
+ int tmdstat;
+ struct tmd *tmdp;
+ struct priv *p = netdev_priv(dev);
+
+
+ PRINTK2(("## %s: SK_txintr() status: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ tmdp = p->tmdhead + p->tmdlast; /* Which buffer we sent at last ? */
+
+ /* Set next buffer */
+ p->tmdlast++;
+ p->tmdlast &= TMDNUM-1;
+
+ tmdstat = readb(&tmdp->u.s.status);
+
+ /*
+ * We check status of transmitted packet.
+ * see LANCE data-sheet for error explanation
+ */
+ if (tmdstat & TX_ERR) /* Error occurred */
+ {
+ int stat2 = readw(&tmdp->status2);
+
+ printk("%s: TX error: %04x %04x\n", dev->name, tmdstat, stat2);
+
+ if (stat2 & TX_TDR) /* TDR problems? */
+ {
+ printk("%s: tdr-problems \n", dev->name);
+ }
+
+ if (stat2 & TX_RTRY) /* Failed in 16 attempts to transmit ? */
+ p->stats.tx_aborted_errors++;
+ if (stat2 & TX_LCOL) /* Late collision ? */
+ p->stats.tx_window_errors++;
+ if (stat2 & TX_LCAR) /* Loss of Carrier ? */
+ p->stats.tx_carrier_errors++;
+ if (stat2 & TX_UFLO) /* Underflow error ? */
+ {
+ p->stats.tx_fifo_errors++;
+
+ /*
+ * If UFLO error occurs it will turn transmitter of.
+ * So we must reinit LANCE
+ */
+
+ SK_lance_init(dev, MODE_NORMAL);
+ }
+
+ p->stats.tx_errors++;
+
+ writew(0, &tmdp->status2); /* Clear error flags */
+ }
+ else if (tmdstat & TX_MORE) /* Collisions occurred ? */
+ {
+ /*
+ * Here I have a problem.
+ * I only know that there must be one or up to 15 collisions.
+ * That's why TX_MORE is set, because after 16 attempts TX_RTRY
+ * will be set which means couldn't send packet aborted transfer.
+ *
+ * First I did not have this in but then I thought at minimum
+ * we see that something was not ok.
+ * If anyone knows something better than this to handle this
+ * please report it.
+ */
+
+ p->stats.collisions++;
+ }
+ else /* Packet sent without any problems */
+ {
+ p->stats.tx_packets++;
+ }
+
+ /*
+ * We mark transmitter not busy anymore, because now we have a free
+ * transmit descriptor which can be filled by SK_send_packet and
+ * afterwards sent by the LANCE
+ *
+ * The function which do handle slow IRQ parts is do_bottom_half()
+ * which runs at normal kernel priority, that means all interrupt are
+ * enabled. (see kernel/irq.c)
+ *
+ * net_bh does something like this:
+ * - check if already in net_bh
+ * - try to transmit something from the send queue
+ * - if something is in the receive queue send it up to higher
+ * levels if it is a known protocol
+ * - try to transmit something from the send queue
+ */
+
+ netif_wake_queue(dev);
+
+} /* End of SK_txintr() */
+
+
+/*-
+ * Function : SK_rxintr
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/27
+ *
+ * Description : Buffer sent, check for errors, relinquish ownership
+ * of the receive message descriptor.
+ *
+ * Parameters : I : SK_G16 device structure
+ * Return Value : None
+ * Globals : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static void SK_rxintr(struct net_device *dev)
+{
+
+ struct rmd *rmdp;
+ int rmdstat;
+ struct priv *p = netdev_priv(dev);
+
+ PRINTK2(("## %s: SK_rxintr(). CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ rmdp = p->rmdhead + p->rmdnum;
+
+ /* As long as we own the next entry, check status and send
+ * it up to higher layer
+ */
+
+ while (!( (rmdstat = readb(&rmdp->u.s.status)) & RX_OWN))
+ {
+ /*
+ * Start and end of packet must be set, because we use
+ * the ethernet maximum packet length (1518) as buffer size.
+ *
+ * Because our buffers are at maximum OFLO and BUFF errors are
+ * not to be concerned (see Data sheet)
+ */
+
+ if ((rmdstat & (RX_STP | RX_ENP)) != (RX_STP | RX_ENP))
+ {
+ /* Start of a frame > 1518 Bytes ? */
+
+ if (rmdstat & RX_STP)
+ {
+ p->stats.rx_errors++; /* bad packet received */
+ p->stats.rx_length_errors++; /* packet too long */
+
+ printk("%s: packet too long\n", dev->name);
+ }
+
+ /*
+ * All other packets will be ignored until a new frame with
+ * start (RX_STP) set follows.
+ *
+ * What we do is just give descriptor free for new incoming
+ * packets.
+ */
+
+ writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */
+
+ }
+ else if (rmdstat & RX_ERR) /* Receive Error ? */
+ {
+ printk("%s: RX error: %04x\n", dev->name, (int) rmdstat);
+
+ p->stats.rx_errors++;
+
+ if (rmdstat & RX_FRAM) p->stats.rx_frame_errors++;
+ if (rmdstat & RX_CRC) p->stats.rx_crc_errors++;
+
+ writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */
+
+ }
+ else /* We have a packet which can be queued for the upper layers */
+ {
+
+ int len = readw(&rmdp->mlen) & 0x0fff; /* extract message length from receive buffer */
+ struct sk_buff *skb;
+
+ skb = dev_alloc_skb(len+2); /* allocate socket buffer */
+
+ if (skb == NULL) /* Could not get mem ? */
+ {
+
+ /*
+ * Couldn't allocate sk_buffer so we give descriptor back
+ * to Lance, update statistics and go ahead.
+ */
+
+ writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */
+ printk("%s: Couldn't allocate sk_buff, deferring packet.\n",
+ dev->name);
+ p->stats.rx_dropped++;
+
+ break; /* Jump out */
+ }
+
+ /* Prepare sk_buff to queue for upper layers */
+
+ skb->dev = dev;
+ skb_reserve(skb,2); /* Align IP header on 16 byte boundary */
+
+ /*
+ * Copy data out of our receive descriptor into sk_buff.
+ *
+ * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and
+ * ignore status fields)
+ */
+
+ memcpy_fromio(skb_put(skb,len), (rmdp->u.buffer & 0x00ffffff), len);
+
+
+ /*
+ * Notify the upper protocol layers that there is another packet
+ * to handle
+ *
+ * netif_rx() always succeeds. see /net/inet/dev.c for more.
+ */
+
+ skb->protocol=eth_type_trans(skb,dev);
+ netif_rx(skb); /* queue packet and mark it for processing */
+
+ /*
+ * Packet is queued and marked for processing so we
+ * free our descriptor and update statistics
+ */
+
+ writeb(RX_OWN, &rmdp->u.s.status);
+ dev->last_rx = jiffies;
+ p->stats.rx_packets++;
+ p->stats.rx_bytes += len;
+
+
+ p->rmdnum++;
+ p->rmdnum %= RMDNUM;
+
+ rmdp = p->rmdhead + p->rmdnum;
+ }
+ }
+} /* End of SK_rxintr() */
+
+
+/*-
+ * Function : SK_close
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/26
+ *
+ * Description : close gets called from dev_close() and should
+ * deinstall the card (free_irq, mem etc).
+ *
+ * Parameters : I : struct net_device *dev - our device structure
+ * Return Value : 0 - closed device driver
+ * Errors : None
+ * Globals : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+/* I have tried to set BOOT_ROM on and RAM off but then, after a 'ifconfig
+ * down' the system stops. So I don't shut set card to init state.
+ */
+
+static int SK_close(struct net_device *dev)
+{
+
+ PRINTK(("## %s: SK_close(). CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ netif_stop_queue(dev); /* Transmitter busy */
+
+ printk("%s: Shutting %s down CSR0 %#06x\n", dev->name, SK_NAME,
+ (int) SK_read_reg(CSR0));
+
+ SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */
+
+ free_irq(dev->irq, dev); /* Free IRQ */
+
+ return 0; /* always succeed */
+
+} /* End of SK_close() */
+
+
+/*-
+ * Function : SK_get_stats
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/26
+ *
+ * Description : Return current status structure to upper layers.
+ * It is called by sprintf_stats (dev.c).
+ *
+ * Parameters : I : struct net_device *dev - our device structure
+ * Return Value : struct net_device_stats * - our current statistics
+ * Errors : None
+ * Side Effects : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+static struct net_device_stats *SK_get_stats(struct net_device *dev)
+{
+
+ struct priv *p = netdev_priv(dev);
+
+ PRINTK(("## %s: SK_get_stats(). CSR0: %#06x\n",
+ SK_NAME, SK_read_reg(CSR0)));
+
+ return &p->stats; /* Return Device status */
+
+} /* End of SK_get_stats() */
+
+
+/*-
+ * Function : set_multicast_list
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/26
+ *
+ * Description : This function gets called when a program performs
+ * a SIOCSIFFLAGS call. Ifconfig does this if you call
+ * 'ifconfig [-]allmulti' which enables or disables the
+ * Promiscuous mode.
+ * Promiscuous mode is when the Network card accepts all
+ * packets, not only the packets which match our MAC
+ * Address. It is useful for writing a network monitor,
+ * but it is also a security problem. You have to remember
+ * that all information on the net is not encrypted.
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device Structure
+ * Return Value : None
+ * Errors : None
+ * Globals : None
+ * Update History :
+ * YY/MM/DD uid Description
+ * 95/10/18 ACox New multicast calling scheme
+-*/
+
+
+/* Set or clear the multicast filter for SK_G16.
+ */
+
+static void set_multicast_list(struct net_device *dev)
+{
+
+ if (dev->flags&IFF_PROMISC)
+ {
+ /* Reinitialize LANCE with MODE_PROM set */
+ SK_lance_init(dev, MODE_PROM);
+ }
+ else if (dev->mc_count==0 && !(dev->flags&IFF_ALLMULTI))
+ {
+ /* Reinitialize LANCE without MODE_PROM */
+ SK_lance_init(dev, MODE_NORMAL);
+ }
+ else
+ {
+ /* Multicast with logical address filter on */
+ /* Reinitialize LANCE without MODE_PROM */
+ SK_lance_init(dev, MODE_NORMAL);
+
+ /* Not implemented yet. */
+ }
+} /* End of set_multicast_list() */
+
+
+
+/*-
+ * Function : SK_rom_addr
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/06/01
+ *
+ * Description : Try to find a Boot_ROM at all possible locations
+ *
+ * Parameters : None
+ * Return Value : Address where Boot_ROM is
+ * Errors : 0 - Did not find Boot_ROM
+ * Globals : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+unsigned int __init SK_rom_addr(void)
+{
+ int i,j;
+ int rom_found = 0;
+ unsigned int rom_location[] = SK_BOOT_ROM_LOCATIONS;
+ unsigned char rom_id[] = SK_BOOT_ROM_ID;
+ unsigned char test_byte;
+
+ /* Autodetect Boot_ROM */
+ PRINTK(("## %s: Autodetection of Boot_ROM\n", SK_NAME));
+
+ for (i = 0; (rom_location[i] != 0) && (rom_found == 0); i++)
+ {
+
+ PRINTK(("## Trying ROM location %#08x", rom_location[i]));
+
+ rom_found = 1;
+ for (j = 0; j < 6; j++)
+ {
+ test_byte = readb(rom_location[i]+j);
+ PRINTK((" %02x ", *test_byte));
+
+ if(test_byte != rom_id[j])
+ {
+ rom_found = 0;
+ }
+ }
+ PRINTK(("\n"));
+ }
+
+ if (rom_found == 1)
+ {
+ PRINTK(("## %s: Boot_ROM found at %#08x\n",
+ SK_NAME, rom_location[(i-1)]));
+
+ return (rom_location[--i]);
+ }
+ else
+ {
+ PRINTK(("%s: No Boot_ROM found\n", SK_NAME));
+ return 0;
+ }
+} /* End of SK_rom_addr() */
+
+
+
+/* LANCE access functions
+ *
+ * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
+ */
+
+
+/*-
+ * Function : SK_reset_board
+ *
+ * Author : Patrick J.D. Weichmann
+ *
+ * Date Created : 94/05/25
+ *
+ * Description : This function resets SK_G16 and all components, but
+ * POS registers are not changed
+ *
+ * Parameters : None
+ * Return Value : None
+ * Errors : None
+ * Globals : SK_RAM *board - SK_RAM structure pointer
+ *
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+void SK_reset_board(void)
+{
+ writeb(0x00, SK_PORT); /* Reset active */
+ mdelay(5); /* Delay min 5ms */
+ writeb(SK_RESET, SK_PORT); /* Set back to normal operation */
+
+} /* End of SK_reset_board() */
+
+
+/*-
+ * Function : SK_set_RAP
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/25
+ *
+ * Description : Set LANCE Register Address Port to register
+ * for later data transfer.
+ *
+ * Parameters : I : reg_number - which CSR to read/write from/to
+ * Return Value : None
+ * Errors : None
+ * Globals : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+void SK_set_RAP(int reg_number)
+{
+ writew(reg_number, SK_IOREG);
+ writeb(SK_RESET | SK_RAP | SK_WREG, SK_PORT);
+ writeb(SK_DOIO, SK_IOCOM);
+
+ while (readb(SK_PORT) & SK_IORUN)
+ barrier();
+} /* End of SK_set_RAP() */
+
+
+/*-
+ * Function : SK_read_reg
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/25
+ *
+ * Description : Set RAP and read data from a LANCE CSR register
+ *
+ * Parameters : I : reg_number - which CSR to read from
+ * Return Value : Register contents
+ * Errors : None
+ * Globals : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+int SK_read_reg(int reg_number)
+{
+ SK_set_RAP(reg_number);
+
+ writeb(SK_RESET | SK_RDATA | SK_RREG, SK_PORT);
+ writeb(SK_DOIO, SK_IOCOM);
+
+ while (readb(SK_PORT) & SK_IORUN)
+ barrier();
+ return (readw(SK_IOREG));
+
+} /* End of SK_read_reg() */
+
+
+/*-
+ * Function : SK_rread_reg
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/28
+ *
+ * Description : Read data from preseted register.
+ * This function requires that you know which
+ * Register is actually set. Be aware that CSR1-3
+ * can only be accessed when in CSR0 STOP is set.
+ *
+ * Return Value : Register contents
+ * Errors : None
+ * Globals : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+int SK_rread_reg(void)
+{
+ writeb(SK_RESET | SK_RDATA | SK_RREG, SK_PORT);
+
+ writeb(SK_DOIO, SK_IOCOM);
+
+ while (readb(SK_PORT) & SK_IORUN)
+ barrier();
+ return (readw(SK_IOREG));
+
+} /* End of SK_rread_reg() */
+
+
+/*-
+ * Function : SK_write_reg
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/25
+ *
+ * Description : This function sets the RAP then fills in the
+ * LANCE I/O Reg and starts Transfer to LANCE.
+ * It waits until transfer has ended which is max. 7 ms
+ * and then it returns.
+ *
+ * Parameters : I : reg_number - which CSR to write to
+ * I : value - what value to fill into register
+ * Return Value : None
+ * Errors : None
+ * Globals : SK_RAM *board - SK_RAM structure pointer
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+void SK_write_reg(int reg_number, int value)
+{
+ SK_set_RAP(reg_number);
+
+ writew(value, SK_IOREG);
+ writeb(SK_RESET | SK_RDATA | SK_WREG, SK_PORT);
+ writeb(SK_DOIO, SK_IOCOM);
+
+ while (readb(SK_PORT) & SK_IORUN)
+ barrier();
+} /* End of SK_write_reg */
+
+
+
+/*
+ * Debugging functions
+ * -------------------
+ */
+
+/*-
+ * Function : SK_print_pos
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/25
+ *
+ * Description : This function prints out the 4 POS (Programmable
+ * Option Select) Registers. Used mainly to debug operation.
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device structure
+ * I : char * - Text which will be printed as title
+ * Return Value : None
+ * Errors : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+void SK_print_pos(struct net_device *dev, char *text)
+{
+ int ioaddr = dev->base_addr;
+
+ unsigned char pos0 = inb(SK_POS0),
+ pos1 = inb(SK_POS1),
+ pos2 = inb(SK_POS2),
+ pos3 = inb(SK_POS3),
+ pos4 = inb(SK_POS4);
+
+
+ printk("## %s: %s.\n"
+ "## pos0=%#4x pos1=%#4x pos2=%#04x pos3=%#08x pos4=%#04x\n",
+ SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);
+
+} /* End of SK_print_pos() */
+
+
+
+/*-
+ * Function : SK_print_dev
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/05/25
+ *
+ * Description : This function simply prints out the important fields
+ * of the device structure.
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device structure
+ * I : char *text - Title for printing
+ * Return Value : None
+ * Errors : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+void SK_print_dev(struct net_device *dev, char *text)
+{
+ if (dev == NULL)
+ {
+ printk("## %s: Device Structure. %s\n", SK_NAME, text);
+ printk("## DEVICE == NULL\n");
+ }
+ else
+ {
+ printk("## %s: Device Structure. %s\n", SK_NAME, text);
+ printk("## Device Name: %s Base Address: %#06lx IRQ: %d\n",
+ dev->name, dev->base_addr, dev->irq);
+
+ printk("## next device: %#08x init function: %#08x\n",
+ (int) dev->next, (int) dev->init);
+ }
+
+} /* End of SK_print_dev() */
+
+
+
+/*-
+ * Function : SK_print_ram
+ * Author : Patrick J.D. Weichmann
+ * Date Created : 94/06/02
+ *
+ * Description : This function is used to check how are things set up
+ * in the 16KB RAM. Also the pointers to the receive and
+ * transmit descriptor rings and rx and tx buffers locations.
+ * It contains a minor bug in printing, but has no effect to the values
+ * only newlines are not correct.
+ *
+ * Parameters : I : struct net_device *dev - SK_G16 device structure
+ * Return Value : None
+ * Errors : None
+ * Globals : None
+ * Update History :
+ * YY/MM/DD uid Description
+-*/
+
+void __init SK_print_ram(struct net_device *dev)
+{
+
+ int i;
+ struct priv *p = netdev_priv(dev);
+
+ printk("## %s: RAM Details.\n"
+ "## RAM at %#08x tmdhead: %#08x rmdhead: %#08x initblock: %#08x\n",
+ SK_NAME,
+ (unsigned int) p->ram,
+ (unsigned int) p->tmdhead,
+ (unsigned int) p->rmdhead,
+ (unsigned int) &(p->ram)->ib);
+
+ printk("## ");
+
+ for(i = 0; i < TMDNUM; i++)
+ {
+ if (!(i % 3)) /* Every third line do a newline */
+ {
+ printk("\n## ");
+ }
+ printk("tmdbufs%d: %#08x ", (i+1), (int) p->tmdbufs[i]);
+ }
+ printk("## ");
+
+ for(i = 0; i < RMDNUM; i++)
+ {
+ if (!(i % 3)) /* Every third line do a newline */
+ {
+ printk("\n## ");
+ }
+ printk("rmdbufs%d: %#08x ", (i+1), (int) p->rmdbufs[i]);
+ }
+ printk("\n");
+
+} /* End of SK_print_ram() */
+