Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1192 insertions, 0 deletions

diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
new file mode 100644
index 000000000..5d30b3e18
--- /dev/null
+++ b/drivers/net/hamradio/yam.c
@@ -0,0 +1,1192 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*****************************************************************************/
+
+/*
+ *    yam.c  -- YAM radio modem driver.
+ *
+ *      Copyright (C) 1998 Frederic Rible F1OAT (frible@teaser.fr)
+ *      Adapted from baycom.c driver written by Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *  Please note that the GPL allows you to use the driver, NOT the radio.
+ *  In order to use the radio, you need a license from the communications
+ *  authority of your country.
+ *
+ *  History:
+ *   0.0 F1OAT 06.06.98  Begin of work with baycom.c source code V 0.3
+ *   0.1 F1OAT 07.06.98  Add timer polling routine for channel arbitration
+ *   0.2 F6FBB 08.06.98  Added delay after FPGA programming
+ *   0.3 F6FBB 29.07.98  Delayed PTT implementation for dupmode=2
+ *   0.4 F6FBB 30.07.98  Added TxTail, Slottime and Persistence
+ *   0.5 F6FBB 01.08.98  Shared IRQs, /proc/net and network statistics
+ *   0.6 F6FBB 25.08.98  Added 1200Bds format
+ *   0.7 F6FBB 12.09.98  Added to the kernel configuration
+ *   0.8 F6FBB 14.10.98  Fixed slottime/persistence timing bug
+ *       OK1ZIA 2.09.01  Fixed "kfree_skb on hard IRQ" 
+ *                       using dev_kfree_skb_any(). (important in 2.4 kernel)
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/if.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/bitops.h>
+#include <linux/random.h>
+#include <asm/io.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/firmware.h>
+#include <linux/platform_device.h>
+
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <net/ax25.h>
+
+#include <linux/kernel.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <net/net_namespace.h>
+
+#include <linux/uaccess.h>
+#include <linux/init.h>
+
+#include <linux/yam.h>
+
+/* --------------------------------------------------------------------- */
+
+static const char yam_drvname[] = "yam";
+static const char yam_drvinfo[] __initconst = KERN_INFO \
+	"YAM driver version 0.8 by F1OAT/F6FBB\n";
+
+/* --------------------------------------------------------------------- */
+
+#define FIRMWARE_9600	"yam/9600.bin"
+#define FIRMWARE_1200	"yam/1200.bin"
+
+#define YAM_9600	1
+#define YAM_1200	2
+
+#define NR_PORTS	4
+#define YAM_MAGIC	0xF10A7654
+
+/* Transmitter states */
+
+#define TX_OFF		0
+#define TX_HEAD		1
+#define TX_DATA		2
+#define TX_CRC1		3
+#define TX_CRC2		4
+#define TX_TAIL		5
+
+#define YAM_MAX_FRAME	1024
+
+#define DEFAULT_BITRATE	9600			/* bps */
+#define DEFAULT_HOLDD	10			/* sec */
+#define DEFAULT_TXD	300			/* ms */
+#define DEFAULT_TXTAIL	10			/* ms */
+#define DEFAULT_SLOT	100			/* ms */
+#define DEFAULT_PERS	64			/* 0->255 */
+
+struct yam_port {
+	int magic;
+	int bitrate;
+	int baudrate;
+	int iobase;
+	int irq;
+	int dupmode;
+
+	struct net_device *dev;
+
+	int nb_rxint;
+	int nb_mdint;
+
+	/* Parameters section */
+
+	int txd;				/* tx delay */
+	int holdd;				/* duplex ptt delay */
+	int txtail;				/* txtail delay */
+	int slot;				/* slottime */
+	int pers;				/* persistence */
+
+	/* Tx section */
+
+	int tx_state;
+	int tx_count;
+	int slotcnt;
+	unsigned char tx_buf[YAM_MAX_FRAME];
+	int tx_len;
+	int tx_crcl, tx_crch;
+	struct sk_buff_head send_queue;		/* Packets awaiting transmission */
+
+	/* Rx section */
+
+	int dcd;
+	unsigned char rx_buf[YAM_MAX_FRAME];
+	int rx_len;
+	int rx_crcl, rx_crch;
+};
+
+struct yam_mcs {
+	unsigned char bits[YAM_FPGA_SIZE];
+	int bitrate;
+	struct yam_mcs *next;
+};
+
+static struct net_device *yam_devs[NR_PORTS];
+
+static struct yam_mcs *yam_data;
+
+static DEFINE_TIMER(yam_timer, NULL);
+
+/* --------------------------------------------------------------------- */
+
+#define RBR(iobase)	(iobase+0)
+#define THR(iobase)	(iobase+0)
+#define IER(iobase)	(iobase+1)
+#define IIR(iobase)	(iobase+2)
+#define FCR(iobase)	(iobase+2)
+#define LCR(iobase)	(iobase+3)
+#define MCR(iobase)	(iobase+4)
+#define LSR(iobase)	(iobase+5)
+#define MSR(iobase)	(iobase+6)
+#define SCR(iobase)	(iobase+7)
+#define DLL(iobase)	(iobase+0)
+#define DLM(iobase)	(iobase+1)
+
+#define YAM_EXTENT	8
+
+/* Interrupt Identification Register Bit Masks */
+#define IIR_NOPEND	1
+#define IIR_MSR		0
+#define IIR_TX		2
+#define IIR_RX		4
+#define IIR_LSR		6
+#define IIR_TIMEOUT	12			/* Fifo mode only */
+
+#define IIR_MASK	0x0F
+
+/* Interrupt Enable Register Bit Masks */
+#define IER_RX		1			/* enable rx interrupt */
+#define IER_TX		2			/* enable tx interrupt */
+#define IER_LSR		4			/* enable line status interrupts */
+#define IER_MSR		8			/* enable modem status interrupts */
+
+/* Modem Control Register Bit Masks */
+#define MCR_DTR		0x01			/* DTR output */
+#define MCR_RTS		0x02			/* RTS output */
+#define MCR_OUT1	0x04			/* OUT1 output (not accessible in RS232) */
+#define MCR_OUT2	0x08			/* Master Interrupt enable (must be set on PCs) */
+#define MCR_LOOP	0x10			/* Loopback enable */
+
+/* Modem Status Register Bit Masks */
+#define MSR_DCTS	0x01			/* Delta CTS input */
+#define MSR_DDSR	0x02			/* Delta DSR */
+#define MSR_DRIN	0x04			/* Delta RI */
+#define MSR_DDCD	0x08			/* Delta DCD */
+#define MSR_CTS		0x10			/* CTS input */
+#define MSR_DSR		0x20			/* DSR input */
+#define MSR_RING	0x40			/* RI  input */
+#define MSR_DCD		0x80			/* DCD input */
+
+/* line status register bit mask */
+#define LSR_RXC		0x01
+#define LSR_OE		0x02
+#define LSR_PE		0x04
+#define LSR_FE		0x08
+#define LSR_BREAK	0x10
+#define LSR_THRE	0x20
+#define LSR_TSRE	0x40
+
+/* Line Control Register Bit Masks */
+#define LCR_DLAB	0x80
+#define LCR_BREAK	0x40
+#define LCR_PZERO	0x28
+#define LCR_PEVEN	0x18
+#define LCR_PODD	0x08
+#define LCR_STOP1	0x00
+#define LCR_STOP2	0x04
+#define LCR_BIT5	0x00
+#define LCR_BIT6	0x02
+#define LCR_BIT7	0x01
+#define LCR_BIT8	0x03
+
+/* YAM Modem <-> UART Port mapping */
+
+#define TX_RDY		MSR_DCTS		/* transmitter ready to send */
+#define RX_DCD		MSR_DCD			/* carrier detect */
+#define RX_FLAG		MSR_RING		/* hdlc flag received */
+#define FPGA_DONE	MSR_DSR			/* FPGA is configured */
+#define PTT_ON		(MCR_RTS|MCR_OUT2)	/* activate PTT */
+#define PTT_OFF		(MCR_DTR|MCR_OUT2)	/* release PTT */
+
+#define ENABLE_RXINT	IER_RX			/* enable uart rx interrupt during rx */
+#define ENABLE_TXINT	IER_MSR			/* enable uart ms interrupt during tx */
+#define ENABLE_RTXINT	(IER_RX|IER_MSR)	/* full duplex operations */
+
+
+/*************************************************************************
+* CRC Tables
+************************************************************************/
+
+static const unsigned char chktabl[256] =
+{0x00, 0x89, 0x12, 0x9b, 0x24, 0xad, 0x36, 0xbf, 0x48, 0xc1, 0x5a, 0xd3, 0x6c, 0xe5, 0x7e,
+ 0xf7, 0x81, 0x08, 0x93, 0x1a, 0xa5, 0x2c, 0xb7, 0x3e, 0xc9, 0x40, 0xdb, 0x52, 0xed, 0x64,
+ 0xff, 0x76, 0x02, 0x8b, 0x10, 0x99, 0x26, 0xaf, 0x34, 0xbd, 0x4a, 0xc3, 0x58, 0xd1, 0x6e,
+ 0xe7, 0x7c, 0xf5, 0x83, 0x0a, 0x91, 0x18, 0xa7, 0x2e, 0xb5, 0x3c, 0xcb, 0x42, 0xd9, 0x50,
+ 0xef, 0x66, 0xfd, 0x74, 0x04, 0x8d, 0x16, 0x9f, 0x20, 0xa9, 0x32, 0xbb, 0x4c, 0xc5, 0x5e,
+ 0xd7, 0x68, 0xe1, 0x7a, 0xf3, 0x85, 0x0c, 0x97, 0x1e, 0xa1, 0x28, 0xb3, 0x3a, 0xcd, 0x44,
+ 0xdf, 0x56, 0xe9, 0x60, 0xfb, 0x72, 0x06, 0x8f, 0x14, 0x9d, 0x22, 0xab, 0x30, 0xb9, 0x4e,
+ 0xc7, 0x5c, 0xd5, 0x6a, 0xe3, 0x78, 0xf1, 0x87, 0x0e, 0x95, 0x1c, 0xa3, 0x2a, 0xb1, 0x38,
+ 0xcf, 0x46, 0xdd, 0x54, 0xeb, 0x62, 0xf9, 0x70, 0x08, 0x81, 0x1a, 0x93, 0x2c, 0xa5, 0x3e,
+ 0xb7, 0x40, 0xc9, 0x52, 0xdb, 0x64, 0xed, 0x76, 0xff, 0x89, 0x00, 0x9b, 0x12, 0xad, 0x24,
+ 0xbf, 0x36, 0xc1, 0x48, 0xd3, 0x5a, 0xe5, 0x6c, 0xf7, 0x7e, 0x0a, 0x83, 0x18, 0x91, 0x2e,
+ 0xa7, 0x3c, 0xb5, 0x42, 0xcb, 0x50, 0xd9, 0x66, 0xef, 0x74, 0xfd, 0x8b, 0x02, 0x99, 0x10,
+ 0xaf, 0x26, 0xbd, 0x34, 0xc3, 0x4a, 0xd1, 0x58, 0xe7, 0x6e, 0xf5, 0x7c, 0x0c, 0x85, 0x1e,
+ 0x97, 0x28, 0xa1, 0x3a, 0xb3, 0x44, 0xcd, 0x56, 0xdf, 0x60, 0xe9, 0x72, 0xfb, 0x8d, 0x04,
+ 0x9f, 0x16, 0xa9, 0x20, 0xbb, 0x32, 0xc5, 0x4c, 0xd7, 0x5e, 0xe1, 0x68, 0xf3, 0x7a, 0x0e,
+ 0x87, 0x1c, 0x95, 0x2a, 0xa3, 0x38, 0xb1, 0x46, 0xcf, 0x54, 0xdd, 0x62, 0xeb, 0x70, 0xf9,
+ 0x8f, 0x06, 0x9d, 0x14, 0xab, 0x22, 0xb9, 0x30, 0xc7, 0x4e, 0xd5, 0x5c, 0xe3, 0x6a, 0xf1,
+ 0x78};
+static const unsigned char chktabh[256] =
+{0x00, 0x11, 0x23, 0x32, 0x46, 0x57, 0x65, 0x74, 0x8c, 0x9d, 0xaf, 0xbe, 0xca, 0xdb, 0xe9,
+ 0xf8, 0x10, 0x01, 0x33, 0x22, 0x56, 0x47, 0x75, 0x64, 0x9c, 0x8d, 0xbf, 0xae, 0xda, 0xcb,
+ 0xf9, 0xe8, 0x21, 0x30, 0x02, 0x13, 0x67, 0x76, 0x44, 0x55, 0xad, 0xbc, 0x8e, 0x9f, 0xeb,
+ 0xfa, 0xc8, 0xd9, 0x31, 0x20, 0x12, 0x03, 0x77, 0x66, 0x54, 0x45, 0xbd, 0xac, 0x9e, 0x8f,
+ 0xfb, 0xea, 0xd8, 0xc9, 0x42, 0x53, 0x61, 0x70, 0x04, 0x15, 0x27, 0x36, 0xce, 0xdf, 0xed,
+ 0xfc, 0x88, 0x99, 0xab, 0xba, 0x52, 0x43, 0x71, 0x60, 0x14, 0x05, 0x37, 0x26, 0xde, 0xcf,
+ 0xfd, 0xec, 0x98, 0x89, 0xbb, 0xaa, 0x63, 0x72, 0x40, 0x51, 0x25, 0x34, 0x06, 0x17, 0xef,
+ 0xfe, 0xcc, 0xdd, 0xa9, 0xb8, 0x8a, 0x9b, 0x73, 0x62, 0x50, 0x41, 0x35, 0x24, 0x16, 0x07,
+ 0xff, 0xee, 0xdc, 0xcd, 0xb9, 0xa8, 0x9a, 0x8b, 0x84, 0x95, 0xa7, 0xb6, 0xc2, 0xd3, 0xe1,
+ 0xf0, 0x08, 0x19, 0x2b, 0x3a, 0x4e, 0x5f, 0x6d, 0x7c, 0x94, 0x85, 0xb7, 0xa6, 0xd2, 0xc3,
+ 0xf1, 0xe0, 0x18, 0x09, 0x3b, 0x2a, 0x5e, 0x4f, 0x7d, 0x6c, 0xa5, 0xb4, 0x86, 0x97, 0xe3,
+ 0xf2, 0xc0, 0xd1, 0x29, 0x38, 0x0a, 0x1b, 0x6f, 0x7e, 0x4c, 0x5d, 0xb5, 0xa4, 0x96, 0x87,
+ 0xf3, 0xe2, 0xd0, 0xc1, 0x39, 0x28, 0x1a, 0x0b, 0x7f, 0x6e, 0x5c, 0x4d, 0xc6, 0xd7, 0xe5,
+ 0xf4, 0x80, 0x91, 0xa3, 0xb2, 0x4a, 0x5b, 0x69, 0x78, 0x0c, 0x1d, 0x2f, 0x3e, 0xd6, 0xc7,
+ 0xf5, 0xe4, 0x90, 0x81, 0xb3, 0xa2, 0x5a, 0x4b, 0x79, 0x68, 0x1c, 0x0d, 0x3f, 0x2e, 0xe7,
+ 0xf6, 0xc4, 0xd5, 0xa1, 0xb0, 0x82, 0x93, 0x6b, 0x7a, 0x48, 0x59, 0x2d, 0x3c, 0x0e, 0x1f,
+ 0xf7, 0xe6, 0xd4, 0xc5, 0xb1, 0xa0, 0x92, 0x83, 0x7b, 0x6a, 0x58, 0x49, 0x3d, 0x2c, 0x1e,
+ 0x0f};
+
+/*************************************************************************
+* FPGA functions
+************************************************************************/
+
+static void delay(int ms)
+{
+	unsigned long timeout = jiffies + ((ms * HZ) / 1000);
+	while (time_before(jiffies, timeout))
+		cpu_relax();
+}
+
+/*
+ * reset FPGA
+ */
+
+static void fpga_reset(int iobase)
+{
+	outb(0, IER(iobase));
+	outb(LCR_DLAB | LCR_BIT5, LCR(iobase));
+	outb(1, DLL(iobase));
+	outb(0, DLM(iobase));
+
+	outb(LCR_BIT5, LCR(iobase));
+	inb(LSR(iobase));
+	inb(MSR(iobase));
+	/* turn off FPGA supply voltage */
+	outb(MCR_OUT1 | MCR_OUT2, MCR(iobase));
+	delay(100);
+	/* turn on FPGA supply voltage again */
+	outb(MCR_DTR | MCR_RTS | MCR_OUT1 | MCR_OUT2, MCR(iobase));
+	delay(100);
+}
+
+/*
+ * send one byte to FPGA
+ */
+
+static int fpga_write(int iobase, unsigned char wrd)
+{
+	unsigned char bit;
+	int k;
+	unsigned long timeout = jiffies + HZ / 10;
+
+	for (k = 0; k < 8; k++) {
+		bit = (wrd & 0x80) ? (MCR_RTS | MCR_DTR) : MCR_DTR;
+		outb(bit | MCR_OUT1 | MCR_OUT2, MCR(iobase));
+		wrd <<= 1;
+		outb(0xfc, THR(iobase));
+		while ((inb(LSR(iobase)) & LSR_TSRE) == 0)
+			if (time_after(jiffies, timeout))
+				return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * predef should be 0 for loading user defined mcs
+ * predef should be YAM_1200 for loading predef 1200 mcs
+ * predef should be YAM_9600 for loading predef 9600 mcs
+ */
+static unsigned char *add_mcs(unsigned char *bits, int bitrate,
+			      unsigned int predef)
+{
+	const char *fw_name[2] = {FIRMWARE_9600, FIRMWARE_1200};
+	const struct firmware *fw;
+	struct platform_device *pdev;
+	struct yam_mcs *p;
+	int err;
+
+	switch (predef) {
+	case 0:
+		fw = NULL;
+		break;
+	case YAM_1200:
+	case YAM_9600:
+		predef--;
+		pdev = platform_device_register_simple("yam", 0, NULL, 0);
+		if (IS_ERR(pdev)) {
+			printk(KERN_ERR "yam: Failed to register firmware\n");
+			return NULL;
+		}
+		err = request_firmware(&fw, fw_name[predef], &pdev->dev);
+		platform_device_unregister(pdev);
+		if (err) {
+			printk(KERN_ERR "Failed to load firmware \"%s\"\n",
+			       fw_name[predef]);
+			return NULL;
+		}
+		if (fw->size != YAM_FPGA_SIZE) {
+			printk(KERN_ERR "Bogus length %zu in firmware \"%s\"\n",
+			       fw->size, fw_name[predef]);
+			release_firmware(fw);
+			return NULL;
+		}
+		bits = (unsigned char *)fw->data;
+		break;
+	default:
+		printk(KERN_ERR "yam: Invalid predef number %u\n", predef);
+		return NULL;
+	}
+
+	/* If it already exists, replace the bit data */
+	p = yam_data;
+	while (p) {
+		if (p->bitrate == bitrate) {
+			memcpy(p->bits, bits, YAM_FPGA_SIZE);
+			goto out;
+		}
+		p = p->next;
+	}
+
+	/* Allocate a new mcs */
+	if ((p = kmalloc(sizeof(struct yam_mcs), GFP_KERNEL)) == NULL) {
+		release_firmware(fw);
+		return NULL;
+	}
+	memcpy(p->bits, bits, YAM_FPGA_SIZE);
+	p->bitrate = bitrate;
+	p->next = yam_data;
+	yam_data = p;
+ out:
+	release_firmware(fw);
+	return p->bits;
+}
+
+static unsigned char *get_mcs(int bitrate)
+{
+	struct yam_mcs *p;
+
+	p = yam_data;
+	while (p) {
+		if (p->bitrate == bitrate)
+			return p->bits;
+		p = p->next;
+	}
+
+	/* Load predefined mcs data */
+	switch (bitrate) {
+	case 1200:
+		/* setting predef as YAM_1200 for loading predef 1200 mcs */
+		return add_mcs(NULL, bitrate, YAM_1200);
+	default:
+		/* setting predef as YAM_9600 for loading predef 9600 mcs */
+		return add_mcs(NULL, bitrate, YAM_9600);
+	}
+}
+
+/*
+ * download bitstream to FPGA
+ * data is contained in bits[] array in yam1200.h resp. yam9600.h
+ */
+
+static int fpga_download(int iobase, int bitrate)
+{
+	int i, rc;
+	unsigned char *pbits;
+
+	pbits = get_mcs(bitrate);
+	if (pbits == NULL)
+		return -1;
+
+	fpga_reset(iobase);
+	for (i = 0; i < YAM_FPGA_SIZE; i++) {
+		if (fpga_write(iobase, pbits[i])) {
+			printk(KERN_ERR "yam: error in write cycle\n");
+			return -1;			/* write... */
+		}
+	}
+
+	fpga_write(iobase, 0xFF);
+	rc = inb(MSR(iobase));		/* check DONE signal */
+
+	/* Needed for some hardwares */
+	delay(50);
+
+	return (rc & MSR_DSR) ? 0 : -1;
+}
+
+
+/************************************************************************
+* Serial port init 
+************************************************************************/
+
+static void yam_set_uart(struct net_device *dev)
+{
+	struct yam_port *yp = netdev_priv(dev);
+	int divisor = 115200 / yp->baudrate;
+
+	outb(0, IER(dev->base_addr));
+	outb(LCR_DLAB | LCR_BIT8, LCR(dev->base_addr));
+	outb(divisor, DLL(dev->base_addr));
+	outb(0, DLM(dev->base_addr));
+	outb(LCR_BIT8, LCR(dev->base_addr));
+	outb(PTT_OFF, MCR(dev->base_addr));
+	outb(0x00, FCR(dev->base_addr));
+
+	/* Flush pending irq */
+
+	inb(RBR(dev->base_addr));
+	inb(MSR(dev->base_addr));
+
+	/* Enable rx irq */
+
+	outb(ENABLE_RTXINT, IER(dev->base_addr));
+}
+
+
+/* --------------------------------------------------------------------- */
+
+enum uart {
+	c_uart_unknown, c_uart_8250,
+	c_uart_16450, c_uart_16550, c_uart_16550A
+};
+
+static const char *uart_str[] =
+{"unknown", "8250", "16450", "16550", "16550A"};
+
+static enum uart yam_check_uart(unsigned int iobase)
+{
+	unsigned char b1, b2, b3;
+	enum uart u;
+	enum uart uart_tab[] =
+	{c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A};
+
+	b1 = inb(MCR(iobase));
+	outb(b1 | 0x10, MCR(iobase));	/* loopback mode */
+	b2 = inb(MSR(iobase));
+	outb(0x1a, MCR(iobase));
+	b3 = inb(MSR(iobase)) & 0xf0;
+	outb(b1, MCR(iobase));		/* restore old values */
+	outb(b2, MSR(iobase));
+	if (b3 != 0x90)
+		return c_uart_unknown;
+	inb(RBR(iobase));
+	inb(RBR(iobase));
+	outb(0x01, FCR(iobase));	/* enable FIFOs */
+	u = uart_tab[(inb(IIR(iobase)) >> 6) & 3];
+	if (u == c_uart_16450) {
+		outb(0x5a, SCR(iobase));
+		b1 = inb(SCR(iobase));
+		outb(0xa5, SCR(iobase));
+		b2 = inb(SCR(iobase));
+		if ((b1 != 0x5a) || (b2 != 0xa5))
+			u = c_uart_8250;
+	}
+	return u;
+}
+
+/******************************************************************************
+* Rx Section
+******************************************************************************/
+static inline void yam_rx_flag(struct net_device *dev, struct yam_port *yp)
+{
+	if (yp->dcd && yp->rx_len >= 3 && yp->rx_len < YAM_MAX_FRAME) {
+		int pkt_len = yp->rx_len - 2 + 1;	/* -CRC + kiss */
+		struct sk_buff *skb;
+
+		if ((yp->rx_crch & yp->rx_crcl) != 0xFF) {
+			/* Bad crc */
+		} else {
+			if (!(skb = dev_alloc_skb(pkt_len))) {
+				printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
+				++dev->stats.rx_dropped;
+			} else {
+				unsigned char *cp;
+				cp = skb_put(skb, pkt_len);
+				*cp++ = 0;		/* KISS kludge */
+				memcpy(cp, yp->rx_buf, pkt_len - 1);
+				skb->protocol = ax25_type_trans(skb, dev);
+				netif_rx(skb);
+				++dev->stats.rx_packets;
+			}
+		}
+	}
+	yp->rx_len = 0;
+	yp->rx_crcl = 0x21;
+	yp->rx_crch = 0xf3;
+}
+
+static inline void yam_rx_byte(struct net_device *dev, struct yam_port *yp, unsigned char rxb)
+{
+	if (yp->rx_len < YAM_MAX_FRAME) {
+		unsigned char c = yp->rx_crcl;
+		yp->rx_crcl = (chktabl[c] ^ yp->rx_crch);
+		yp->rx_crch = (chktabh[c] ^ rxb);
+		yp->rx_buf[yp->rx_len++] = rxb;
+	}
+}
+
+/********************************************************************************
+* TX Section
+********************************************************************************/
+
+static void ptt_on(struct net_device *dev)
+{
+	outb(PTT_ON, MCR(dev->base_addr));
+}
+
+static void ptt_off(struct net_device *dev)
+{
+	outb(PTT_OFF, MCR(dev->base_addr));
+}
+
+static netdev_tx_t yam_send_packet(struct sk_buff *skb,
+					 struct net_device *dev)
+{
+	struct yam_port *yp = netdev_priv(dev);
+
+	if (skb->protocol == htons(ETH_P_IP))
+		return ax25_ip_xmit(skb);
+
+	skb_queue_tail(&yp->send_queue, skb);
+	netif_trans_update(dev);
+	return NETDEV_TX_OK;
+}
+
+static void yam_start_tx(struct net_device *dev, struct yam_port *yp)
+{
+	if ((yp->tx_state == TX_TAIL) || (yp->txd == 0))
+		yp->tx_count = 1;
+	else
+		yp->tx_count = (yp->bitrate * yp->txd) / 8000;
+	yp->tx_state = TX_HEAD;
+	ptt_on(dev);
+}
+
+static void yam_arbitrate(struct net_device *dev)
+{
+	struct yam_port *yp = netdev_priv(dev);
+
+	if (yp->magic != YAM_MAGIC || yp->tx_state != TX_OFF ||
+	    skb_queue_empty(&yp->send_queue))
+		return;
+	/* tx_state is TX_OFF and there is data to send */
+
+	if (yp->dupmode) {
+		/* Full duplex mode, don't wait */
+		yam_start_tx(dev, yp);
+		return;
+	}
+	if (yp->dcd) {
+		/* DCD on, wait slotime ... */
+		yp->slotcnt = yp->slot / 10;
+		return;
+	}
+	/* Is slottime passed ? */
+	if ((--yp->slotcnt) > 0)
+		return;
+
+	yp->slotcnt = yp->slot / 10;
+
+	/* is random > persist ? */
+	if ((prandom_u32() % 256) > yp->pers)
+		return;
+
+	yam_start_tx(dev, yp);
+}
+
+static void yam_dotimer(struct timer_list *unused)
+{
+	int i;
+
+	for (i = 0; i < NR_PORTS; i++) {
+		struct net_device *dev = yam_devs[i];
+		if (dev && netif_running(dev))
+			yam_arbitrate(dev);
+	}
+	yam_timer.expires = jiffies + HZ / 100;
+	add_timer(&yam_timer);
+}
+
+static void yam_tx_byte(struct net_device *dev, struct yam_port *yp)
+{
+	struct sk_buff *skb;
+	unsigned char b, temp;
+
+	switch (yp->tx_state) {
+	case TX_OFF:
+		break;
+	case TX_HEAD:
+		if (--yp->tx_count <= 0) {
+			if (!(skb = skb_dequeue(&yp->send_queue))) {
+				ptt_off(dev);
+				yp->tx_state = TX_OFF;
+				break;
+			}
+			yp->tx_state = TX_DATA;
+			if (skb->data[0] != 0) {
+/*                              do_kiss_params(s, skb->data, skb->len); */
+				dev_kfree_skb_any(skb);
+				break;
+			}
+			yp->tx_len = skb->len - 1;	/* strip KISS byte */
+			if (yp->tx_len >= YAM_MAX_FRAME || yp->tx_len < 2) {
+        			dev_kfree_skb_any(skb);
+				break;
+			}
+			skb_copy_from_linear_data_offset(skb, 1,
+							 yp->tx_buf,
+							 yp->tx_len);
+			dev_kfree_skb_any(skb);
+			yp->tx_count = 0;
+			yp->tx_crcl = 0x21;
+			yp->tx_crch = 0xf3;
+			yp->tx_state = TX_DATA;
+		}
+		break;
+	case TX_DATA:
+		b = yp->tx_buf[yp->tx_count++];
+		outb(b, THR(dev->base_addr));
+		temp = yp->tx_crcl;
+		yp->tx_crcl = chktabl[temp] ^ yp->tx_crch;
+		yp->tx_crch = chktabh[temp] ^ b;
+		if (yp->tx_count >= yp->tx_len) {
+			yp->tx_state = TX_CRC1;
+		}
+		break;
+	case TX_CRC1:
+		yp->tx_crch = chktabl[yp->tx_crcl] ^ yp->tx_crch;
+		yp->tx_crcl = chktabh[yp->tx_crcl] ^ chktabl[yp->tx_crch] ^ 0xff;
+		outb(yp->tx_crcl, THR(dev->base_addr));
+		yp->tx_state = TX_CRC2;
+		break;
+	case TX_CRC2:
+		outb(chktabh[yp->tx_crch] ^ 0xFF, THR(dev->base_addr));
+		if (skb_queue_empty(&yp->send_queue)) {
+			yp->tx_count = (yp->bitrate * yp->txtail) / 8000;
+			if (yp->dupmode == 2)
+				yp->tx_count += (yp->bitrate * yp->holdd) / 8;
+			if (yp->tx_count == 0)
+				yp->tx_count = 1;
+			yp->tx_state = TX_TAIL;
+		} else {
+			yp->tx_count = 1;
+			yp->tx_state = TX_HEAD;
+		}
+		++dev->stats.tx_packets;
+		break;
+	case TX_TAIL:
+		if (--yp->tx_count <= 0) {
+			yp->tx_state = TX_OFF;
+			ptt_off(dev);
+		}
+		break;
+	}
+}
+
+/***********************************************************************************
+* ISR routine
+************************************************************************************/
+
+static irqreturn_t yam_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev;
+	struct yam_port *yp;
+	unsigned char iir;
+	int counter = 100;
+	int i;
+	int handled = 0;
+
+	for (i = 0; i < NR_PORTS; i++) {
+		dev = yam_devs[i];
+		yp = netdev_priv(dev);
+
+		if (!netif_running(dev))
+			continue;
+
+		while ((iir = IIR_MASK & inb(IIR(dev->base_addr))) != IIR_NOPEND) {
+			unsigned char msr = inb(MSR(dev->base_addr));
+			unsigned char lsr = inb(LSR(dev->base_addr));
+			unsigned char rxb;
+
+			handled = 1;
+
+			if (lsr & LSR_OE)
+				++dev->stats.rx_fifo_errors;
+
+			yp->dcd = (msr & RX_DCD) ? 1 : 0;
+
+			if (--counter <= 0) {
+				printk(KERN_ERR "%s: too many irq iir=%d\n",
+						dev->name, iir);
+				goto out;
+			}
+			if (msr & TX_RDY) {
+				++yp->nb_mdint;
+				yam_tx_byte(dev, yp);
+			}
+			if (lsr & LSR_RXC) {
+				++yp->nb_rxint;
+				rxb = inb(RBR(dev->base_addr));
+				if (msr & RX_FLAG)
+					yam_rx_flag(dev, yp);
+				else
+					yam_rx_byte(dev, yp, rxb);
+			}
+		}
+	}
+out:
+	return IRQ_RETVAL(handled);
+}
+
+#ifdef CONFIG_PROC_FS
+
+static void *yam_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
+}
+
+static void *yam_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return (*pos < NR_PORTS) ? yam_devs[*pos] : NULL;
+}
+
+static void yam_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static int yam_seq_show(struct seq_file *seq, void *v)
+{
+	struct net_device *dev = v;
+	const struct yam_port *yp = netdev_priv(dev);
+
+	seq_printf(seq, "Device %s\n", dev->name);
+	seq_printf(seq, "  Up       %d\n", netif_running(dev));
+	seq_printf(seq, "  Speed    %u\n", yp->bitrate);
+	seq_printf(seq, "  IoBase   0x%x\n", yp->iobase);
+	seq_printf(seq, "  BaudRate %u\n", yp->baudrate);
+	seq_printf(seq, "  IRQ      %u\n", yp->irq);
+	seq_printf(seq, "  TxState  %u\n", yp->tx_state);
+	seq_printf(seq, "  Duplex   %u\n", yp->dupmode);
+	seq_printf(seq, "  HoldDly  %u\n", yp->holdd);
+	seq_printf(seq, "  TxDelay  %u\n", yp->txd);
+	seq_printf(seq, "  TxTail   %u\n", yp->txtail);
+	seq_printf(seq, "  SlotTime %u\n", yp->slot);
+	seq_printf(seq, "  Persist  %u\n", yp->pers);
+	seq_printf(seq, "  TxFrames %lu\n", dev->stats.tx_packets);
+	seq_printf(seq, "  RxFrames %lu\n", dev->stats.rx_packets);
+	seq_printf(seq, "  TxInt    %u\n", yp->nb_mdint);
+	seq_printf(seq, "  RxInt    %u\n", yp->nb_rxint);
+	seq_printf(seq, "  RxOver   %lu\n", dev->stats.rx_fifo_errors);
+	seq_printf(seq, "\n");
+	return 0;
+}
+
+static const struct seq_operations yam_seqops = {
+	.start = yam_seq_start,
+	.next = yam_seq_next,
+	.stop = yam_seq_stop,
+	.show = yam_seq_show,
+};
+#endif
+
+
+/* --------------------------------------------------------------------- */
+
+static int yam_open(struct net_device *dev)
+{
+	struct yam_port *yp = netdev_priv(dev);
+	enum uart u;
+	int i;
+	int ret=0;
+
+	printk(KERN_INFO "Trying %s at iobase 0x%lx irq %u\n", dev->name, dev->base_addr, dev->irq);
+
+	if (!yp->bitrate)
+		return -ENXIO;
+	if (!dev->base_addr || dev->base_addr > 0x1000 - YAM_EXTENT ||
+		dev->irq < 2 || dev->irq > 15) {
+		return -ENXIO;
+	}
+	if (!request_region(dev->base_addr, YAM_EXTENT, dev->name))
+	{
+		printk(KERN_ERR "%s: cannot 0x%lx busy\n", dev->name, dev->base_addr);
+		return -EACCES;
+	}
+	if ((u = yam_check_uart(dev->base_addr)) == c_uart_unknown) {
+		printk(KERN_ERR "%s: cannot find uart type\n", dev->name);
+		ret = -EIO;
+		goto out_release_base;
+	}
+	if (fpga_download(dev->base_addr, yp->bitrate)) {
+		printk(KERN_ERR "%s: cannot init FPGA\n", dev->name);
+		ret = -EIO;
+		goto out_release_base;
+	}
+	outb(0, IER(dev->base_addr));
+	if (request_irq(dev->irq, yam_interrupt, IRQF_SHARED, dev->name, dev)) {
+		printk(KERN_ERR "%s: irq %d busy\n", dev->name, dev->irq);
+		ret = -EBUSY;
+		goto out_release_base;
+	}
+
+	yam_set_uart(dev);
+
+	netif_start_queue(dev);
+	
+	yp->slotcnt = yp->slot / 10;
+
+	/* Reset overruns for all ports - FPGA programming makes overruns */
+	for (i = 0; i < NR_PORTS; i++) {
+		struct net_device *yam_dev = yam_devs[i];
+
+		inb(LSR(yam_dev->base_addr));
+		yam_dev->stats.rx_fifo_errors = 0;
+	}
+
+	printk(KERN_INFO "%s at iobase 0x%lx irq %u uart %s\n", dev->name, dev->base_addr, dev->irq,
+		   uart_str[u]);
+	return 0;
+
+out_release_base:
+	release_region(dev->base_addr, YAM_EXTENT);
+	return ret;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int yam_close(struct net_device *dev)
+{
+	struct sk_buff *skb;
+	struct yam_port *yp = netdev_priv(dev);
+
+	if (!dev)
+		return -EINVAL;
+
+	/*
+	 * disable interrupts
+	 */
+	outb(0, IER(dev->base_addr));
+	outb(1, MCR(dev->base_addr));
+	/* Remove IRQ handler if last */
+	free_irq(dev->irq,dev);
+	release_region(dev->base_addr, YAM_EXTENT);
+	netif_stop_queue(dev);
+	while ((skb = skb_dequeue(&yp->send_queue)))
+		dev_kfree_skb(skb);
+
+	printk(KERN_INFO "%s: close yam at iobase 0x%lx irq %u\n",
+		   yam_drvname, dev->base_addr, dev->irq);
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct yam_port *yp = netdev_priv(dev);
+	struct yamdrv_ioctl_cfg yi;
+	struct yamdrv_ioctl_mcs *ym;
+	int ioctl_cmd;
+
+	if (copy_from_user(&ioctl_cmd, ifr->ifr_data, sizeof(int)))
+		 return -EFAULT;
+
+	if (yp->magic != YAM_MAGIC)
+		return -EINVAL;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (cmd != SIOCDEVPRIVATE)
+		return -EINVAL;
+
+	switch (ioctl_cmd) {
+
+	case SIOCYAMRESERVED:
+		return -EINVAL;			/* unused */
+
+	case SIOCYAMSMCS:
+		if (netif_running(dev))
+			return -EINVAL;		/* Cannot change this parameter when up */
+		ym = memdup_user(ifr->ifr_data,
+				 sizeof(struct yamdrv_ioctl_mcs));
+		if (IS_ERR(ym))
+			return PTR_ERR(ym);
+		if (ym->cmd != SIOCYAMSMCS || ym->bitrate > YAM_MAXBITRATE) {
+			kfree(ym);
+			return -EINVAL;
+		}
+		/* setting predef as 0 for loading userdefined mcs data */
+		add_mcs(ym->bits, ym->bitrate, 0);
+		kfree(ym);
+		break;
+
+	case SIOCYAMSCFG:
+		if (!capable(CAP_SYS_RAWIO))
+			return -EPERM;
+		if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
+			 return -EFAULT;
+
+		if (yi.cmd != SIOCYAMSCFG)
+			return -EINVAL;
+		if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
+			return -EINVAL;		/* Cannot change this parameter when up */
+		if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
+			return -EINVAL;		/* Cannot change this parameter when up */
+		if ((yi.cfg.mask & YAM_BITRATE) && netif_running(dev))
+			return -EINVAL;		/* Cannot change this parameter when up */
+		if ((yi.cfg.mask & YAM_BAUDRATE) && netif_running(dev))
+			return -EINVAL;		/* Cannot change this parameter when up */
+
+		if (yi.cfg.mask & YAM_IOBASE) {
+			yp->iobase = yi.cfg.iobase;
+			dev->base_addr = yi.cfg.iobase;
+		}
+		if (yi.cfg.mask & YAM_IRQ) {
+			if (yi.cfg.irq > 15)
+				return -EINVAL;
+			yp->irq = yi.cfg.irq;
+			dev->irq = yi.cfg.irq;
+		}
+		if (yi.cfg.mask & YAM_BITRATE) {
+			if (yi.cfg.bitrate > YAM_MAXBITRATE)
+				return -EINVAL;
+			yp->bitrate = yi.cfg.bitrate;
+		}
+		if (yi.cfg.mask & YAM_BAUDRATE) {
+			if (yi.cfg.baudrate > YAM_MAXBAUDRATE)
+				return -EINVAL;
+			yp->baudrate = yi.cfg.baudrate;
+		}
+		if (yi.cfg.mask & YAM_MODE) {
+			if (yi.cfg.mode > YAM_MAXMODE)
+				return -EINVAL;
+			yp->dupmode = yi.cfg.mode;
+		}
+		if (yi.cfg.mask & YAM_HOLDDLY) {
+			if (yi.cfg.holddly > YAM_MAXHOLDDLY)
+				return -EINVAL;
+			yp->holdd = yi.cfg.holddly;
+		}
+		if (yi.cfg.mask & YAM_TXDELAY) {
+			if (yi.cfg.txdelay > YAM_MAXTXDELAY)
+				return -EINVAL;
+			yp->txd = yi.cfg.txdelay;
+		}
+		if (yi.cfg.mask & YAM_TXTAIL) {
+			if (yi.cfg.txtail > YAM_MAXTXTAIL)
+				return -EINVAL;
+			yp->txtail = yi.cfg.txtail;
+		}
+		if (yi.cfg.mask & YAM_PERSIST) {
+			if (yi.cfg.persist > YAM_MAXPERSIST)
+				return -EINVAL;
+			yp->pers = yi.cfg.persist;
+		}
+		if (yi.cfg.mask & YAM_SLOTTIME) {
+			if (yi.cfg.slottime > YAM_MAXSLOTTIME)
+				return -EINVAL;
+			yp->slot = yi.cfg.slottime;
+			yp->slotcnt = yp->slot / 10;
+		}
+		break;
+
+	case SIOCYAMGCFG:
+		memset(&yi, 0, sizeof(yi));
+		yi.cfg.mask = 0xffffffff;
+		yi.cfg.iobase = yp->iobase;
+		yi.cfg.irq = yp->irq;
+		yi.cfg.bitrate = yp->bitrate;
+		yi.cfg.baudrate = yp->baudrate;
+		yi.cfg.mode = yp->dupmode;
+		yi.cfg.txdelay = yp->txd;
+		yi.cfg.holddly = yp->holdd;
+		yi.cfg.txtail = yp->txtail;
+		yi.cfg.persist = yp->pers;
+		yi.cfg.slottime = yp->slot;
+		if (copy_to_user(ifr->ifr_data, &yi, sizeof(struct yamdrv_ioctl_cfg)))
+			 return -EFAULT;
+		break;
+
+	default:
+		return -EINVAL;
+
+	}
+
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int yam_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sockaddr *sa = (struct sockaddr *) addr;
+
+	/* addr is an AX.25 shifted ASCII mac address */
+	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static const struct net_device_ops yam_netdev_ops = {
+	.ndo_open	     = yam_open,
+	.ndo_stop	     = yam_close,
+	.ndo_start_xmit      = yam_send_packet,
+	.ndo_do_ioctl 	     = yam_ioctl,
+	.ndo_set_mac_address = yam_set_mac_address,
+};
+
+static void yam_setup(struct net_device *dev)
+{
+	struct yam_port *yp = netdev_priv(dev);
+
+	yp->magic = YAM_MAGIC;
+	yp->bitrate = DEFAULT_BITRATE;
+	yp->baudrate = DEFAULT_BITRATE * 2;
+	yp->iobase = 0;
+	yp->irq = 0;
+	yp->dupmode = 0;
+	yp->holdd = DEFAULT_HOLDD;
+	yp->txd = DEFAULT_TXD;
+	yp->txtail = DEFAULT_TXTAIL;
+	yp->slot = DEFAULT_SLOT;
+	yp->pers = DEFAULT_PERS;
+	yp->dev = dev;
+
+	dev->base_addr = yp->iobase;
+	dev->irq = yp->irq;
+
+	skb_queue_head_init(&yp->send_queue);
+
+	dev->netdev_ops = &yam_netdev_ops;
+	dev->header_ops = &ax25_header_ops;
+
+	dev->type = ARPHRD_AX25;
+	dev->hard_header_len = AX25_MAX_HEADER_LEN;
+	dev->mtu = AX25_MTU;
+	dev->addr_len = AX25_ADDR_LEN;
+	memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
+	memcpy(dev->dev_addr, &ax25_defaddr, AX25_ADDR_LEN);
+}
+
+static int __init yam_init_driver(void)
+{
+	struct net_device *dev;
+	int i, err;
+	char name[IFNAMSIZ];
+
+	printk(yam_drvinfo);
+
+	for (i = 0; i < NR_PORTS; i++) {
+		sprintf(name, "yam%d", i);
+		
+		dev = alloc_netdev(sizeof(struct yam_port), name,
+				   NET_NAME_UNKNOWN, yam_setup);
+		if (!dev) {
+			pr_err("yam: cannot allocate net device\n");
+			err = -ENOMEM;
+			goto error;
+		}
+		
+		err = register_netdev(dev);
+		if (err) {
+			printk(KERN_WARNING "yam: cannot register net device %s\n", dev->name);
+			free_netdev(dev);
+			goto error;
+		}
+		yam_devs[i] = dev;
+
+	}
+
+	timer_setup(&yam_timer, yam_dotimer, 0);
+	yam_timer.expires = jiffies + HZ / 100;
+	add_timer(&yam_timer);
+
+	proc_create_seq("yam", 0444, init_net.proc_net, &yam_seqops);
+	return 0;
+ error:
+	while (--i >= 0) {
+		unregister_netdev(yam_devs[i]);
+		free_netdev(yam_devs[i]);
+	}
+	return err;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void __exit yam_cleanup_driver(void)
+{
+	struct yam_mcs *p;
+	int i;
+
+	del_timer_sync(&yam_timer);
+	for (i = 0; i < NR_PORTS; i++) {
+		struct net_device *dev = yam_devs[i];
+		if (dev) {
+			unregister_netdev(dev);
+			free_netdev(dev);
+		}
+	}
+
+	while (yam_data) {
+		p = yam_data;
+		yam_data = yam_data->next;
+		kfree(p);
+	}
+
+	remove_proc_entry("yam", init_net.proc_net);
+}
+
+/* --------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Frederic Rible F1OAT frible@teaser.fr");
+MODULE_DESCRIPTION("Yam amateur radio modem driver");
+MODULE_LICENSE("GPL");
+MODULE_FIRMWARE(FIRMWARE_1200);
+MODULE_FIRMWARE(FIRMWARE_9600);
+
+module_init(yam_init_driver);
+module_exit(yam_cleanup_driver);
+
+/* --------------------------------------------------------------------- */
+