diff options
Diffstat (limited to 'drivers/net/hamradio/yam.c')
| -rw-r--r-- | drivers/net/hamradio/yam.c | 1218 |
1 files changed, 1218 insertions, 0 deletions
diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c new file mode 100644 index 00000000000..fd7b00fe38e --- /dev/null +++ b/drivers/net/hamradio/yam.c @@ -0,0 +1,1218 @@ +/*****************************************************************************/ + +/* + * 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) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * 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 Persistance + * 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/config.h> +#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 <asm/io.h> +#include <asm/system.h> +#include <linux/interrupt.h> +#include <linux/ioport.h> + +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/etherdevice.h> +#include <linux/skbuff.h> +#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) +/* prototypes for ax25_encapsulate and ax25_rebuild_header */ +#include <net/ax25.h> +#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */ + +/* make genksyms happy */ +#include <linux/ip.h> +#include <linux/udp.h> +#include <linux/tcp.h> + +#include <linux/kernel.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> + +#include <asm/uaccess.h> +#include <linux/init.h> + +#include <linux/yam.h> +#include "yam9600.h" +#include "yam1200.h" + +/* --------------------------------------------------------------------- */ + +static const char yam_drvname[] = "yam"; +static char yam_drvinfo[] __initdata = KERN_INFO "YAM driver version 0.8 by F1OAT/F6FBB\n"; + +/* --------------------------------------------------------------------- */ + +#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; + + /* Stats section */ + + struct net_device_stats stats; + + 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 char ax25_bcast[7] = +{'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, '0' << 1}; +static char ax25_test[7] = +{'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, '1' << 1}; + +static struct timer_list yam_timer = TIMER_INITIALIZER(NULL, 0, 0); + +/* --------------------------------------------------------------------- */ + +#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; +} + +static unsigned char *add_mcs(unsigned char *bits, int bitrate) +{ + struct yam_mcs *p; + + /* If it already exists, replace the bit data */ + p = yam_data; + while (p) { + if (p->bitrate == bitrate) { + memcpy(p->bits, bits, YAM_FPGA_SIZE); + return p->bits; + } + p = p->next; + } + + /* Allocate a new mcs */ + if ((p = kmalloc(sizeof(struct yam_mcs), GFP_KERNEL)) == NULL) { + printk(KERN_WARNING "YAM: no memory to allocate mcs\n"); + return NULL; + } + memcpy(p->bits, bits, YAM_FPGA_SIZE); + p->bitrate = bitrate; + p->next = yam_data; + yam_data = p; + + 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: + return add_mcs(bits_1200, bitrate); + default: + return add_mcs(bits_9600, bitrate); + } +} + +/* + * 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); + ++yp->stats.rx_dropped; + } else { + unsigned char *cp; + skb->dev = dev; + cp = skb_put(skb, pkt_len); + *cp++ = 0; /* KISS kludge */ + memcpy(cp, yp->rx_buf, pkt_len - 1); + skb->protocol = htons(ETH_P_AX25); + skb->mac.raw = skb->data; + netif_rx(skb); + dev->last_rx = jiffies; + ++yp->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 int yam_send_packet(struct sk_buff *skb, struct net_device *dev) +{ + struct yam_port *yp = netdev_priv(dev); + + skb_queue_tail(&yp->send_queue, skb); + dev->trans_start = jiffies; + return 0; +} + +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 unsigned short random_seed; + +static inline unsigned short random_num(void) +{ + random_seed = 28629 * random_seed + 157; + return random_seed; +} + +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 ((random_num() % 256) > yp->pers) + return; + + yam_start_tx(dev, yp); +} + +static void yam_dotimer(unsigned long dummy) +{ + 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; + } + memcpy(yp->tx_buf, skb->data + 1, 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; + } + ++yp->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 pt_regs *regs) +{ + 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) + ++yp->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", yp->stats.tx_packets); + seq_printf(seq, " RxFrames %lu\n", yp->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", yp->stats.rx_fifo_errors); + seq_printf(seq, "\n"); + return 0; +} + +static struct seq_operations yam_seqops = { + .start = yam_seq_start, + .next = yam_seq_next, + .stop = yam_seq_stop, + .show = yam_seq_show, +}; + +static int yam_info_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &yam_seqops); +} + +static struct file_operations yam_info_fops = { + .owner = THIS_MODULE, + .open = yam_info_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +#endif + + +/* --------------------------------------------------------------------- */ + +static struct net_device_stats *yam_get_stats(struct net_device *dev) +{ + struct yam_port *yp; + + if (!dev) + return NULL; + + yp = netdev_priv(dev); + if (yp->magic != YAM_MAGIC) + return NULL; + + /* + * Get the current statistics. This may be called with the + * card open or closed. + */ + return &yp->stats; +} + +/* --------------------------------------------------------------------- */ + +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 (!dev || !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, SA_INTERRUPT | SA_SHIRQ, 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 *dev = yam_devs[i]; + struct yam_port *yp = netdev_priv(dev); + inb(LSR(dev->base_addr)); + yp->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 */ + if ((ym = kmalloc(sizeof(struct yamdrv_ioctl_mcs), GFP_KERNEL)) == NULL) + return -ENOBUFS; + ym->bitrate = 9600; + if (copy_from_user(ym, ifr->ifr_data, sizeof(struct yamdrv_ioctl_mcs))) { + kfree(ym); + return -EFAULT; + } + if (ym->bitrate > YAM_MAXBITRATE) { + kfree(ym); + return -EINVAL; + } + add_mcs(ym->bits, ym->bitrate); + 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.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: + 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 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; + SET_MODULE_OWNER(dev); + + dev->open = yam_open; + dev->stop = yam_close; + dev->do_ioctl = yam_ioctl; + dev->hard_start_xmit = yam_send_packet; + dev->get_stats = yam_get_stats; + + skb_queue_head_init(&yp->send_queue); + +#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) + dev->hard_header = ax25_encapsulate; + dev->rebuild_header = ax25_rebuild_header; +#else /* CONFIG_AX25 || CONFIG_AX25_MODULE */ + dev->hard_header = NULL; + dev->rebuild_header = NULL; +#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */ + + dev->set_mac_address = yam_set_mac_address; + + dev->type = ARPHRD_AX25; /* AF_AX25 device */ + dev->hard_header_len = 73; /* We do digipeaters now */ + dev->mtu = 256; /* AX25 is the default */ + dev->addr_len = 7; /* sizeof an ax.25 address */ + memcpy(dev->broadcast, ax25_bcast, 7); + memcpy(dev->dev_addr, ax25_test, 7); + +} + +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, + yam_setup); + if (!dev) { + printk(KERN_ERR "yam: cannot allocate net device %s\n", + dev->name); + err = -ENOMEM; + goto error; + } + + err = register_netdev(dev); + if (err) { + printk(KERN_WARNING "yam: cannot register net device %s\n", dev->name); + goto error; + } + yam_devs[i] = dev; + + } + + yam_timer.function = yam_dotimer; + yam_timer.expires = jiffies + HZ / 100; + add_timer(&yam_timer); + + proc_net_fops_create("yam", S_IRUGO, &yam_info_fops); + 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(&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); + } + + proc_net_remove("yam"); +} + +/* --------------------------------------------------------------------- */ + +MODULE_AUTHOR("Frederic Rible F1OAT frible@teaser.fr"); +MODULE_DESCRIPTION("Yam amateur radio modem driver"); +MODULE_LICENSE("GPL"); + +module_init(yam_init_driver); +module_exit(yam_cleanup_driver); + +/* --------------------------------------------------------------------- */ + |