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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/atari_pamsnet.c
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'drivers/net/atari_pamsnet.c')
-rw-r--r--drivers/net/atari_pamsnet.c895
1 files changed, 895 insertions, 0 deletions
diff --git a/drivers/net/atari_pamsnet.c b/drivers/net/atari_pamsnet.c
new file mode 100644
index 000000000000..81c362c8cb97
--- /dev/null
+++ b/drivers/net/atari_pamsnet.c
@@ -0,0 +1,895 @@
+/* atari_pamsnet.c PAMsNet device driver for linux68k.
+ *
+ * Version: @(#)PAMsNet.c 0.2ß 03/31/96
+ *
+ * Author: Torsten Lang <Torsten.Lang@ap.physik.uni-giessen.de>
+ * <Torsten.Lang@jung.de>
+ *
+ * This driver is based on my driver PAMSDMA.c for MiNT-Net and
+ * on the driver bionet.c written by
+ * Hartmut Laue <laue@ifk-mp.uni-kiel.de>
+ * and Torsten Narjes <narjes@ifk-mp.uni-kiel.de>
+ *
+ * Little adaptions for integration into pl7 by Roman Hodek
+ *
+ What is it ?
+ ------------
+ This driver controls the PAMsNet LAN-Adapter which connects
+ an ATARI ST/TT via the ACSI-port to an Ethernet-based network.
+
+ This version can be compiled as a loadable module (See the
+ compile command at the bottom of this file).
+ At load time, you can optionally set the debugging level and the
+ fastest response time on the command line of 'insmod'.
+
+ 'pamsnet_debug'
+ controls the amount of diagnostic messages:
+ 0 : no messages
+ >0 : see code for meaning of printed messages
+
+ 'pamsnet_min_poll_time' (always >=1)
+ gives the time (in jiffies) between polls. Low values
+ increase the system load (beware!)
+
+ When loaded, a net device with the name 'eth?' becomes available,
+ which can be controlled with the usual 'ifconfig' command.
+
+ It is possible to compile this driver into the kernel like other
+ (net) drivers. For this purpose, some source files (e.g. config-files
+ makefiles, Space.c) must be changed accordingly. (You may refer to
+ other drivers how to do it.) In this case, the device will be detected
+ at boot time and (probably) appear as 'eth0'.
+
+ Theory of Operation
+ -------------------
+ Because the ATARI DMA port is usually shared between several
+ devices (eg. harddisk, floppy) we cannot block the ACSI bus
+ while waiting for interrupts. Therefore we use a polling mechanism
+ to fetch packets from the adapter. For the same reason, we send
+ packets without checking that the previous packet has been sent to
+ the LAN. We rely on the higher levels of the networking code to detect
+ missing packets and resend them.
+
+ Before we access the ATARI DMA controller, we check if another
+ process is using the DMA. If not, we lock the DMA, perform one or
+ more packet transfers and unlock the DMA before returning.
+ We do not use 'stdma_lock' unconditionally because it is unclear
+ if the networking code can be set to sleep, which will happen if
+ another (possibly slow) device is using the DMA controller.
+
+ The polling is done via timer interrupts which periodically
+ 'simulate' an interrupt from the Ethernet adapter. The time (in jiffies)
+ between polls varies depending on an estimate of the net activity.
+ The allowed range is given by the variable 'bionet_min_poll_time'
+ for the lower (fastest) limit and the constant 'MAX_POLL_TIME'
+ for the higher (slowest) limit.
+
+ Whenever a packet arrives, we switch to fastest response by setting
+ the polling time to its lowest limit. If the following poll fails,
+ because no packets have arrived, we increase the time for the next
+ poll. When the net activity is low, the polling time effectively
+ stays at its maximum value, resulting in the lowest load for the
+ machine.
+ */
+
+#define MAX_POLL_TIME 10
+
+static char *version =
+ "pamsnet.c:v0.2beta 30-mar-96 (c) Torsten Lang.\n";
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/bitops.h>
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <linux/errno.h>
+#include <asm/atarihw.h>
+#include <asm/atariints.h>
+#include <asm/atari_stdma.h>
+#include <asm/atari_acsi.h>
+
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#undef READ
+#undef WRITE
+
+/* use 0 for production, 1 for verification, >2 for debug
+ */
+#ifndef NET_DEBUG
+#define NET_DEBUG 0
+#endif
+/*
+ * Global variable 'pamsnet_debug'. Can be set at load time by 'insmod'
+ */
+unsigned int pamsnet_debug = NET_DEBUG;
+MODULE_PARM(pamsnet_debug, "i");
+MODULE_PARM_DESC(pamsnet_debug, "pamsnet debug enable (0-1)");
+MODULE_LICENSE("GPL");
+
+static unsigned int pamsnet_min_poll_time = 2;
+
+
+/* Information that need to be kept for each board.
+ */
+struct net_local {
+ struct net_device_stats stats;
+ long open_time; /* for debugging */
+ int poll_time; /* polling time varies with net load */
+};
+
+static struct nic_pkt_s { /* packet format */
+ unsigned char buffer[2048];
+} *nic_packet = 0;
+unsigned char *phys_nic_packet;
+
+typedef unsigned char HADDR[6]; /* 6-byte hardware address of lance */
+
+/* Index to functions, as function prototypes.
+ */
+static void start (int target);
+static int stop (int target);
+static int testpkt (int target);
+static int sendpkt (int target, unsigned char *buffer, int length);
+static int receivepkt (int target, unsigned char *buffer);
+static int inquiry (int target, unsigned char *buffer);
+static HADDR *read_hw_addr(int target, unsigned char *buffer);
+static void setup_dma (void *address, unsigned rw_flag, int num_blocks);
+static int send_first (int target, unsigned char byte);
+static int send_1_5 (int lun, unsigned char *command, int dma);
+static int get_status (void);
+static int calc_received (void *start_address);
+
+static int pamsnet_open(struct net_device *dev);
+static int pamsnet_send_packet(struct sk_buff *skb, struct net_device *dev);
+static void pamsnet_poll_rx(struct net_device *);
+static int pamsnet_close(struct net_device *dev);
+static struct net_device_stats *net_get_stats(struct net_device *dev);
+static void pamsnet_tick(unsigned long);
+
+static irqreturn_t pamsnet_intr(int irq, void *data, struct pt_regs *fp);
+
+static struct timer_list pamsnet_timer = TIMER_INITIALIZER(pamsnet_tick, 0, 0);
+
+#define STRAM_ADDR(a) (((a) & 0xff000000) == 0)
+
+typedef struct
+{
+ unsigned char reserved1[0x38];
+ HADDR hwaddr;
+ unsigned char reserved2[0x1c2];
+} DMAHWADDR;
+
+/*
+ * Definitions of commands understood by the PAMs DMA adaptor.
+ *
+ * In general the DMA adaptor uses LUN 0, 5, 6 and 7 on one ID changeable
+ * by the PAM's Net software.
+ *
+ * LUN 0 works as a harddisk. You can boot the PAM's Net driver there.
+ * LUN 5 works as a harddisk and lets you access the RAM and some I/O HW
+ * area. In sector 0, bytes 0x38-0x3d you find the ethernet HW address
+ * of the adaptor.
+ * LUN 6 works as a harddisk and lets you access the firmware ROM.
+ * LUN 7 lets you send and receive packets.
+ *
+ * Some commands like the INQUIRY command work identical on all used LUNs.
+ *
+ * UNKNOWN1 seems to read some data.
+ * Command length is 6 bytes.
+ * UNKNOWN2 seems to read some data (command byte 1 must be !=0). The
+ * following bytes seem to be something like an allocation length.
+ * Command length is 6 bytes.
+ * READPKT reads a packet received by the DMA adaptor.
+ * Command length is 6 bytes.
+ * WRITEPKT sends a packet transferred by the following DMA phase. The length
+ * of the packet is transferred in command bytes 3 and 4.
+ * The adaptor automatically replaces the src hw address in an ethernet
+ * packet by its own hw address.
+ * Command length is 6 bytes.
+ * INQUIRY has the same function as the INQUIRY command supported by harddisks
+ * and other SCSI devices. It lets you detect which device you found
+ * at a given address.
+ * Command length is 6 bytes.
+ * START initializes the DMA adaptor. After this command it is able to send
+ * and receive packets. There is no status byte returned!
+ * Command length is 1 byte.
+ * NUMPKTS gives back the number of received packets waiting in the queue in
+ * the status byte.
+ * Command length is 1 byte.
+ * UNKNOWN3
+ * UNKNOWN4 Function of these three commands is unknown.
+ * UNKNOWN5 The command length of these three commands is 1 byte.
+ * DESELECT immediately deselects the DMA adaptor. May important with interrupt
+ * driven operation.
+ * Command length is 1 byte.
+ * STOP resets the DMA adaptor. After this command packets can no longer
+ * be received or transferred.
+ * Command length is 6 byte.
+ */
+
+enum {UNKNOWN1=3, READPKT=8, UNKNOWN2, WRITEPKT=10, INQUIRY=18, START,
+ NUMPKTS=22, UNKNOWN3, UNKNOWN4, UNKNOWN5, DESELECT, STOP};
+
+#define READSECTOR READPKT
+#define WRITESECTOR WRITEPKT
+
+u_char *inquire8="MV PAM's NET/GK";
+
+#define DMALOW dma_wd.dma_lo
+#define DMAMID dma_wd.dma_md
+#define DMAHIGH dma_wd.dma_hi
+#define DACCESS dma_wd.fdc_acces_seccount
+
+#define MFP_GPIP mfp.par_dt_reg
+
+/* Some useful functions */
+
+#define INT (!(MFP_GPIP & 0x20))
+#define DELAY ({MFP_GPIP; MFP_GPIP; MFP_GPIP;})
+#define WRITEMODE(value) \
+ ({ u_short dummy = value; \
+ __asm__ volatile("movew %0, 0xFFFF8606" : : "d"(dummy)); \
+ DELAY; \
+ })
+#define WRITEBOTH(value1, value2) \
+ ({ u_long dummy = (u_long)(value1)<<16 | (u_short)(value2); \
+ __asm__ volatile("movel %0, 0xFFFF8604" : : "d"(dummy)); \
+ DELAY; \
+ })
+
+/* Definitions for DMODE */
+
+#define READ 0x000
+#define WRITE 0x100
+
+#define DMA_FDC 0x080
+#define DMA_ACSI 0x000
+
+#define DMA_DISABLE 0x040
+
+#define SEC_COUNT 0x010
+#define DMA_WINDOW 0x000
+
+#define REG_ACSI 0x008
+#define REG_FDC 0x000
+
+#define A1 0x002
+
+/* Timeout constants */
+
+#define TIMEOUTCMD HZ/2 /* ca. 500ms */
+#define TIMEOUTDMA HZ /* ca. 1s */
+#define COMMAND_DELAY 500 /* ca. 0.5ms */
+
+unsigned rw;
+int lance_target = -1;
+int if_up = 0;
+
+/* The following routines access the ethernet board connected to the
+ * ACSI port via the st_dma chip.
+ */
+
+/* The following lowlevel routines work on physical addresses only and assume
+ * that eventually needed buffers are
+ * - completely located in ST RAM
+ * - are contigous in the physical address space
+ */
+
+/* Setup the DMA counter */
+
+static void
+setup_dma (address, rw_flag, num_blocks)
+ void *address;
+ unsigned rw_flag;
+ int num_blocks;
+{
+ WRITEMODE((unsigned) rw_flag | DMA_FDC | SEC_COUNT | REG_ACSI |
+ A1);
+ WRITEMODE((unsigned)(rw_flag ^ WRITE) | DMA_FDC | SEC_COUNT | REG_ACSI |
+ A1);
+ WRITEMODE((unsigned) rw_flag | DMA_FDC | SEC_COUNT | REG_ACSI |
+ A1);
+ DMALOW = (unsigned char)((unsigned long)address & 0xFF);
+ DMAMID = (unsigned char)(((unsigned long)address >> 8) & 0xFF);
+ DMAHIGH = (unsigned char)(((unsigned long)address >> 16) & 0xFF);
+ WRITEBOTH((unsigned)num_blocks & 0xFF,
+ rw_flag | DMA_FDC | DMA_WINDOW | REG_ACSI | A1);
+ rw = rw_flag;
+}
+
+/* Send the first byte of an command block */
+
+static int
+send_first (target, byte)
+ int target;
+ unsigned char byte;
+{
+ rw = READ;
+ acsi_delay_end(COMMAND_DELAY);
+ /*
+ * wake up ACSI
+ */
+ WRITEMODE(DMA_FDC | DMA_WINDOW | REG_ACSI);
+ /*
+ * write command byte
+ */
+ WRITEBOTH((target << 5) | (byte & 0x1F), DMA_FDC |
+ DMA_WINDOW | REG_ACSI | A1);
+ return (!acsi_wait_for_IRQ(TIMEOUTCMD));
+}
+
+/* Send the rest of an command block */
+
+static int
+send_1_5 (lun, command, dma)
+ int lun;
+ unsigned char *command;
+ int dma;
+{
+ int i, j;
+
+ for (i=0; i<5; i++) {
+ WRITEBOTH((!i ? (((lun & 0x7) << 5) | (command[i] & 0x1F))
+ : command[i]),
+ rw | REG_ACSI | DMA_WINDOW |
+ ((i < 4) ? DMA_FDC
+ : (dma ? DMA_ACSI
+ : DMA_FDC)) | A1);
+ if (i < 4 && (j = !acsi_wait_for_IRQ(TIMEOUTCMD)))
+ return (j);
+ }
+ return (0);
+}
+
+/* Read a status byte */
+
+static int
+get_status (void)
+{
+ WRITEMODE(DMA_FDC | DMA_WINDOW | REG_ACSI | A1);
+ acsi_delay_start();
+ return ((int)(DACCESS & 0xFF));
+}
+
+/* Calculate the number of received bytes */
+
+static int
+calc_received (start_address)
+ void *start_address;
+{
+ return (int)(
+ (((unsigned long)DMAHIGH << 16) | ((unsigned)DMAMID << 8) | DMALOW)
+ - (unsigned long)start_address);
+}
+
+/* The following midlevel routines still work on physical addresses ... */
+
+/* start() starts the PAM's DMA adaptor */
+
+static void
+start (target)
+ int target;
+{
+ send_first(target, START);
+}
+
+/* stop() stops the PAM's DMA adaptor and returns a value of zero in case of success */
+
+static int
+stop (target)
+ int target;
+{
+ int ret = -1;
+ unsigned char cmd_buffer[5];
+
+ if (send_first(target, STOP))
+ goto bad;
+ cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] =
+ cmd_buffer[3] = cmd_buffer[4] = 0;
+ if (send_1_5(7, cmd_buffer, 0) ||
+ !acsi_wait_for_IRQ(TIMEOUTDMA) ||
+ get_status())
+ goto bad;
+ ret = 0;
+bad:
+ return (ret);
+}
+
+/* testpkt() returns the number of received packets waiting in the queue */
+
+static int
+testpkt(target)
+ int target;
+{
+ int ret = -1;
+
+ if (send_first(target, NUMPKTS))
+ goto bad;
+ ret = get_status();
+bad:
+ return (ret);
+}
+
+/* inquiry() returns 0 when PAM's DMA found, -1 when timeout, -2 otherwise */
+/* Please note: The buffer is for internal use only but must be defined! */
+
+static int
+inquiry (target, buffer)
+ int target;
+ unsigned char *buffer;
+{
+ int ret = -1;
+ unsigned char *vbuffer = phys_to_virt((unsigned long)buffer);
+ unsigned char cmd_buffer[5];
+
+ if (send_first(target, INQUIRY))
+ goto bad;
+ setup_dma(buffer, READ, 1);
+ vbuffer[8] = vbuffer[27] = 0; /* Avoid confusion with previous read data */
+ cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] = cmd_buffer[4] = 0;
+ cmd_buffer[3] = 48;
+ if (send_1_5(5, cmd_buffer, 1) ||
+ !acsi_wait_for_IRQ(TIMEOUTDMA) ||
+ get_status() ||
+ (calc_received(buffer) < 32))
+ goto bad;
+ dma_cache_maintenance((unsigned long)(buffer+8), 20, 0);
+ if (memcmp(inquire8, vbuffer+8, 20))
+ goto bad;
+ ret = 0;
+bad:
+ if (!!NET_DEBUG) {
+ vbuffer[8+20]=0;
+ printk("inquiry of target %d: %s\n", target, vbuffer+8);
+ }
+ return (ret);
+}
+
+/*
+ * read_hw_addr() reads the sector containing the hwaddr and returns
+ * a pointer to it (virtual address!) or 0 in case of an error
+ */
+
+static HADDR
+*read_hw_addr(target, buffer)
+ int target;
+ unsigned char *buffer;
+{
+ HADDR *ret = 0;
+ unsigned char cmd_buffer[5];
+
+ if (send_first(target, READSECTOR))
+ goto bad;
+ setup_dma(buffer, READ, 1);
+ cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] = cmd_buffer[4] = 0;
+ cmd_buffer[3] = 1;
+ if (send_1_5(5, cmd_buffer, 1) ||
+ !acsi_wait_for_IRQ(TIMEOUTDMA) ||
+ get_status())
+ goto bad;
+ ret = phys_to_virt((unsigned long)&(((DMAHWADDR *)buffer)->hwaddr));
+ dma_cache_maintenance((unsigned long)buffer, 512, 0);
+bad:
+ return (ret);
+}
+
+static irqreturn_t
+pamsnet_intr(irq, data, fp)
+ int irq;
+ void *data;
+ struct pt_regs *fp;
+{
+ return IRQ_HANDLED;
+}
+
+/* receivepkt() loads a packet to a given buffer and returns its length */
+
+static int
+receivepkt (target, buffer)
+ int target;
+ unsigned char *buffer;
+{
+ int ret = -1;
+ unsigned char cmd_buffer[5];
+
+ if (send_first(target, READPKT))
+ goto bad;
+ setup_dma(buffer, READ, 3);
+ cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[2] = cmd_buffer[4] = 0;
+ cmd_buffer[3] = 3;
+ if (send_1_5(7, cmd_buffer, 1) ||
+ !acsi_wait_for_IRQ(TIMEOUTDMA) ||
+ get_status())
+ goto bad;
+ ret = calc_received(buffer);
+bad:
+ return (ret);
+}
+
+/* sendpkt() sends a packet and returns a value of zero when the packet was sent
+ successfully */
+
+static int
+sendpkt (target, buffer, length)
+ int target;
+ unsigned char *buffer;
+ int length;
+{
+ int ret = -1;
+ unsigned char cmd_buffer[5];
+
+ if (send_first(target, WRITEPKT))
+ goto bad;
+ setup_dma(buffer, WRITE, 3);
+ cmd_buffer[0] = cmd_buffer[1] = cmd_buffer[4] = 0;
+ cmd_buffer[2] = length >> 8;
+ cmd_buffer[3] = length & 0xFF;
+ if (send_1_5(7, cmd_buffer, 1) ||
+ !acsi_wait_for_IRQ(TIMEOUTDMA) ||
+ get_status())
+ goto bad;
+ ret = 0;
+bad:
+ return (ret);
+}
+
+/* The following higher level routines work on virtual addresses and convert them to
+ * physical addresses when passed to the lowlevel routines. It's up to the higher level
+ * routines to copy data from Alternate RAM to ST RAM if neccesary!
+ */
+
+/* Check for a network adaptor of this type, and return '0' if one exists.
+ */
+
+struct net_device * __init pamsnet_probe (int unit)
+{
+ struct net_device *dev;
+ int i;
+ HADDR *hwaddr;
+ int err;
+
+ unsigned char station_addr[6];
+ static unsigned version_printed;
+ /* avoid "Probing for..." printed 4 times - the driver is supporting only one adapter now! */
+ static int no_more_found;
+
+ if (no_more_found)
+ return ERR_PTR(-ENODEV);
+ no_more_found = 1;
+
+ dev = alloc_etherdev(sizeof(struct net_local));
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+ if (unit >= 0) {
+ sprintf(dev->name, "eth%d", unit);
+ netdev_boot_setup_check(dev);
+ }
+ SET_MODULE_OWNER(dev);
+
+ printk("Probing for PAM's Net/GK Adapter...\n");
+
+ /* Allocate the DMA buffer here since we need it for probing! */
+
+ nic_packet = (struct nic_pkt_s *)acsi_buffer;
+ phys_nic_packet = (unsigned char *)phys_acsi_buffer;
+ if (pamsnet_debug > 0) {
+ printk("nic_packet at 0x%p, phys at 0x%p\n",
+ nic_packet, phys_nic_packet );
+ }
+
+ stdma_lock(pamsnet_intr, NULL);
+ DISABLE_IRQ();
+
+ for (i=0; i<8; i++) {
+ /* Do two inquiries to cover cases with strange equipment on previous ID */
+ /* blocking the ACSI bus (like the SLMC804 laser printer controller... */
+ inquiry(i, phys_nic_packet);
+ if (!inquiry(i, phys_nic_packet)) {
+ lance_target = i;
+ break;
+ }
+ }
+
+ if (!!NET_DEBUG)
+ printk("ID: %d\n",i);
+
+ if (lance_target >= 0) {
+ if (!(hwaddr = read_hw_addr(lance_target, phys_nic_packet)))
+ lance_target = -1;
+ else
+ memcpy (station_addr, hwaddr, ETH_ALEN);
+ }
+
+ ENABLE_IRQ();
+ stdma_release();
+
+ if (lance_target < 0) {
+ printk("No PAM's Net/GK found.\n");
+ free_netdev(dev);
+ return ERR_PTR(-ENODEV);
+ }
+
+ if (pamsnet_debug > 0 && version_printed++ == 0)
+ printk(version);
+
+ printk("%s: %s found on target %01d, eth-addr: %02x:%02x:%02x:%02x:%02x:%02x.\n",
+ dev->name, "PAM's Net/GK", lance_target,
+ station_addr[0], station_addr[1], station_addr[2],
+ station_addr[3], station_addr[4], station_addr[5]);
+
+ /* Initialize the device structure. */
+ dev->open = pamsnet_open;
+ dev->stop = pamsnet_close;
+ dev->hard_start_xmit = pamsnet_send_packet;
+ dev->get_stats = net_get_stats;
+
+ /* Fill in the fields of the device structure with ethernet-generic
+ * values. This should be in a common file instead of per-driver.
+ */
+
+ for (i = 0; i < ETH_ALEN; i++) {
+#if 0
+ dev->broadcast[i] = 0xff;
+#endif
+ dev->dev_addr[i] = station_addr[i];
+ }
+ err = register_netdev(dev);
+ if (!err)
+ return dev;
+
+ free_netdev(dev);
+ return ERR_PTR(err);
+}
+
+/* Open/initialize the board. This is called (in the current kernel)
+ sometime after booting when the 'ifconfig' program is run.
+
+ This routine should set everything up anew at each open, even
+ registers that "should" only need to be set once at boot, so that
+ there is non-reboot way to recover if something goes wrong.
+ */
+static int
+pamsnet_open(struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+
+ if (pamsnet_debug > 0)
+ printk("pamsnet_open\n");
+ stdma_lock(pamsnet_intr, NULL);
+ DISABLE_IRQ();
+
+ /* Reset the hardware here.
+ */
+ if (!if_up)
+ start(lance_target);
+ if_up = 1;
+ lp->open_time = 0; /*jiffies*/
+ lp->poll_time = MAX_POLL_TIME;
+
+ dev->tbusy = 0;
+ dev->interrupt = 0;
+ dev->start = 1;
+
+ ENABLE_IRQ();
+ stdma_release();
+ pamsnet_timer.data = (long)dev;
+ pamsnet_timer.expires = jiffies + lp->poll_time;
+ add_timer(&pamsnet_timer);
+ return 0;
+}
+
+static int
+pamsnet_send_packet(struct sk_buff *skb, struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+ unsigned long flags;
+
+ /* Block a timer-based transmit from overlapping. This could better be
+ * done with atomic_swap(1, dev->tbusy), but set_bit() works as well.
+ */
+ local_irq_save(flags);
+
+ if (stdma_islocked()) {
+ local_irq_restore(flags);
+ lp->stats.tx_errors++;
+ }
+ else {
+ int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+ unsigned long buf = virt_to_phys(skb->data);
+ int stat;
+
+ stdma_lock(pamsnet_intr, NULL);
+ DISABLE_IRQ();
+
+ local_irq_restore(flags);
+ if( !STRAM_ADDR(buf+length-1) ) {
+ memcpy(nic_packet->buffer, skb->data, length);
+ buf = (unsigned long)phys_nic_packet;
+ }
+
+ dma_cache_maintenance(buf, length, 1);
+
+ stat = sendpkt(lance_target, (unsigned char *)buf, length);
+ ENABLE_IRQ();
+ stdma_release();
+
+ dev->trans_start = jiffies;
+ dev->tbusy = 0;
+ lp->stats.tx_packets++;
+ lp->stats.tx_bytes+=length;
+ }
+ dev_kfree_skb(skb);
+
+ return 0;
+}
+
+/* We have a good packet(s), get it/them out of the buffers.
+ */
+static void
+pamsnet_poll_rx(struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+ int boguscount;
+ int pkt_len;
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ /* ++roman: Take care at locking the ST-DMA... This must be done with ints
+ * off, since otherwise an int could slip in between the question and the
+ * locking itself, and then we'd go to sleep... And locking itself is
+ * necessary to keep the floppy_change timer from working with ST-DMA
+ * registers. */
+ if (stdma_islocked()) {
+ local_irq_restore(flags);
+ return;
+ }
+ stdma_lock(pamsnet_intr, NULL);
+ DISABLE_IRQ();
+ local_irq_restore(flags);
+
+ boguscount = testpkt(lance_target);
+ if( lp->poll_time < MAX_POLL_TIME ) lp->poll_time++;
+
+ while(boguscount--) {
+ pkt_len = receivepkt(lance_target, phys_nic_packet);
+
+ if( pkt_len < 60 ) break;
+
+ /* Good packet... */
+
+ dma_cache_maintenance((unsigned long)phys_nic_packet, pkt_len, 0);
+
+ lp->poll_time = pamsnet_min_poll_time; /* fast poll */
+ if( pkt_len >= 60 && pkt_len <= 2048 ) {
+ if (pkt_len > 1514)
+ pkt_len = 1514;
+
+ /* Malloc up new buffer.
+ */
+ skb = alloc_skb(pkt_len, GFP_ATOMIC);
+ if (skb == NULL) {
+ printk("%s: Memory squeeze, dropping packet.\n",
+ dev->name);
+ lp->stats.rx_dropped++;
+ break;
+ }
+ skb->len = pkt_len;
+ skb->dev = dev;
+
+ /* 'skb->data' points to the start of sk_buff data area.
+ */
+ memcpy(skb->data, nic_packet->buffer, pkt_len);
+ netif_rx(skb);
+ dev->last_rx = jiffies;
+ lp->stats.rx_packets++;
+ lp->stats.rx_bytes+=pkt_len;
+ }
+ }
+
+ /* If any worth-while packets have been received, dev_rint()
+ has done a mark_bh(INET_BH) for us and will work on them
+ when we get to the bottom-half routine.
+ */
+
+ ENABLE_IRQ();
+ stdma_release();
+ return;
+}
+
+/* pamsnet_tick: called by pamsnet_timer. Reads packets from the adapter,
+ * passes them to the higher layers and restarts the timer.
+ */
+static void
+pamsnet_tick(unsigned long data) {
+ struct net_device *dev = (struct net_device *)data;
+ struct net_local *lp = netdev_priv(dev);
+
+ if( pamsnet_debug > 0 && (lp->open_time++ & 7) == 8 )
+ printk("pamsnet_tick: %ld\n", lp->open_time);
+
+ pamsnet_poll_rx(dev);
+
+ pamsnet_timer.expires = jiffies + lp->poll_time;
+ add_timer(&pamsnet_timer);
+}
+
+/* The inverse routine to pamsnet_open().
+ */
+static int
+pamsnet_close(struct net_device *dev) {
+ struct net_local *lp = netdev_priv(dev);
+
+ if (pamsnet_debug > 0)
+ printk("pamsnet_close, open_time=%ld\n", lp->open_time);
+ del_timer(&pamsnet_timer);
+ stdma_lock(pamsnet_intr, NULL);
+ DISABLE_IRQ();
+
+ if (if_up)
+ stop(lance_target);
+ if_up = 0;
+
+ lp->open_time = 0;
+
+ dev->tbusy = 1;
+ dev->start = 0;
+
+ ENABLE_IRQ();
+ stdma_release();
+ return 0;
+}
+
+/* Get the current statistics.
+ This may be called with the card open or closed.
+ */
+static struct net_device_stats *net_get_stats(struct net_device *dev)
+{
+ struct net_local *lp = netdev_priv(dev);
+ return &lp->stats;
+}
+
+
+#ifdef MODULE
+
+static struct net_device *pam_dev;
+
+int init_module(void)
+{
+ pam_dev = pamsnet_probe(-1);
+ if (IS_ERR(pam_dev))
+ return PTR_ERR(pam_dev);
+ return 0;
+}
+
+void cleanup_module(void)
+{
+ unregister_netdev(pam_dev);
+ free_netdev(pam_dev);
+}
+
+#endif /* MODULE */
+
+/* Local variables:
+ * compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/include
+ -b m68k-linuxaout -Wall -Wstrict-prototypes -O2
+ -fomit-frame-pointer -pipe -DMODULE -I../../net/inet -c atari_pamsnet.c"
+ * version-control: t
+ * kept-new-versions: 5
+ * tab-width: 8
+ * End:
+ */