/*****************************************************************************/
/*
* 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/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 <asm/system.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 <asm/uaccess.h>
#include <linux/init.h>
#include <linux/yam.h>
/* --------------------------------------------------------------------- */
static const char yam_drvname[] = "yam";
static const char yam_drvinfo[] __initdata = 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, 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;
}
/*
* 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);
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");
release_firmware(fw);
return NULL;
}
memcpy(p->bits, bits, YAM_FPGA_SIZE);
p->bitrate = bitrate;
p->next = yam_data;
yam_data = p;
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 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 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 ((random32() % 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;
}
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,
};
static int yam_info_open(struct inode *inode, struct file *file)
{
return seq_open(file, &yam_seqops);
}
static const struct file_operations yam_info_fops = {
.owner = THIS_MODULE,
.open = yam_info_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#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 (!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, IRQF_DISABLED | 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 */
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;
}
/* 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.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 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,
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(&init_net, "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(&init_net, "yam");
}
/* --------------------------------------------------------------------- */
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);
/* --------------------------------------------------------------------- */
